CN113583714B - Supercritical and above parameter coal electric unit coupling supercritical water hydrogen production system and method - Google Patents
Supercritical and above parameter coal electric unit coupling supercritical water hydrogen production system and method Download PDFInfo
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Abstract
The invention provides a supercritical and above parameter coal-electricity unit coupling supercritical water hydrogen production system and method, which comprises the following steps: the coal-electricity unit thermodynamic system with supercritical and above parameters is used for providing supercritical water, coal powder and low-pressure medium-temperature water; the supercritical and coupled hydrogen production system is used for producing hydrogen by utilizing supercritical water, coal powder and low-pressure medium-temperature water. The invention can fully utilize the residual load space of the coal-electricity unit, enables the unit to be in a high-load-level running state, improves the running level and the efficiency of the coal-electricity unit, and can effectively utilize the generated supercritical water under the condition of not reducing the evaporation capacity of a boiler when the unit participates in load reduction and peak regulation, thereby reducing the generated energy, realizing flexible peak regulation and prolonging the service life of the unit. The thermodynamic system of the supercritical and above parameter coal-power unit can be directly transformed by the existing widely adopted supercritical and above parameter coal-powder furnace generator unit, and the related cost of hydrogen production by supercritical water is greatly reduced.
Description
Technical Field
The invention belongs to the field of clean energy conversion, and particularly relates to a supercritical and above parameter coal-electric unit coupling supercritical water hydrogen production system and method.
Background
As the most widely distributed substance in the universe, hydrogen is considered to be the cleanest and most potential energy source form in the world due to the characteristics of high heat value of unit mass, water as the final product of oxidation reaction such as combustion and the like. Numerous researches and applications are developed in the field of hydrogen energy in countries including China, such as hydrogen fuel cells, large-scale wind and electricity abandonment hydrogen production, advanced coal hydrogen production technology and the like. The large-scale application of hydrogen energy mainly focuses on three aspects of preparation, storage and utilization, in the aspect of preparation, in recent years, the supercritical water gasification hydrogen production technology draws wide attention with near-zero pollutant emission and high hydrogen production efficiency, but the corresponding equipment manufacturing cost and construction cost are high, and the supercritical water gasification hydrogen production unit constructed independently does not have good economy within a short time.
On the other hand, China is a country with more coal, less oil and less gas, and is a country with more coal and less oil and is lack of gas, in order to adapt to the energy requirement brought by the rapid development of the economy of China, China builds a large number of coal-electric units, with the continuous development of the scientific and technological strength and the continuous maturity of related industries of China, the operation parameters of the coal-electric units of China are gradually improved, the supercritical parameters are reached, and the coal-electric units with the supercritical and the above parameters are built on a large scale in China since 2005 and the loading amount is continuously improved due to the mature technical route, equipment technology and higher power generation efficiency. However, due to the aggravation of environmental problems such as global warming caused by greenhouse gas emission, the installation of renewable energy sources such as wind power, photovoltaic and other power generation technologies is rising, the power generation space of the thermal power generation unit is greatly occupied, most of the coal power generation units in China are in a state of extremely low utilization hours all the year round at the present stage, the thermal power generation unit efficiency is low in a low-load operation state, the service life of the coal power generation unit is greatly reduced due to rapid change of load, and how to effectively utilize the residual load space of the coal power generation unit by using related technologies is a research difficulty at the present stage.
Disclosure of Invention
The invention aims to provide a supercritical water hydrogen production system and method by coupling a supercritical coal-electric unit and a parameter above the supercritical water hydrogen production system, and solves the defects in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a supercritical and above parameter coal electric unit coupling supercritical water hydrogen production system, which comprises:
the coal-electricity unit thermodynamic system with supercritical and above parameters is used for providing supercritical water, coal powder and low-pressure medium-temperature water;
the supercritical and coupled hydrogen production system is used for producing hydrogen by utilizing supercritical water, coal powder and low-pressure medium-temperature water.
Preferably, the thermodynamic system of the coal-electric unit with the parameters of supercritical and above comprises a water supply system, a boiler and a powder preparation system, wherein a water outlet of the water supply system is divided into two paths, one path is connected with a water inlet of the boiler, and the other path is connected with a supercritical and coupling hydrogen production system; the discharge port of the powder preparation system is divided into two paths, one path is connected with the feed port of the boiler, and the other path is connected with the supercritical and coupled hydrogen production system;
and a supercritical water outlet of the boiler is connected with a supercritical and coupling hydrogen production system.
Preferably, a high-temperature high-pressure steam outlet of the boiler is connected with a high-pressure cylinder, a medium-temperature medium-pressure outlet of the high-pressure cylinder is connected with a medium-low pressure cylinder, and a steam extraction outlet of the medium-low pressure cylinder is connected with a supercritical and coupling hydrogen production system.
Preferably, the water supply system comprises a water supply pump, a high-pressure heater, a water supplementing system, a circulating water pump, a fine processing device 0, a low-pressure heater and a deaerator, wherein a water outlet of the water supplementing system is connected with a water inlet of the boiler through the circulating water pump, the fine processing device 0, the low-pressure heater, the deaerator, the water supply pump and the high-pressure heater in sequence; the water outlet of the deaerator is also connected with a supercritical and coupling hydrogen production system.
Preferably, the supercritical and coupled hydrogen production system comprises a high-concentration coal slurry mixer, a coal slurry supercritical water mixer, a supercritical reactor, a gas-solid separation device and a hydrogen collection device, wherein a coal powder outlet of the thermodynamic system of the supercritical and above parameters coal-electricity unit is connected with a feed inlet of the high-concentration coal slurry mixer; a low-pressure medium-temperature water outlet of the coal electric unit thermodynamic system with the supercritical and above parameters is connected with a water inlet of the high-concentration coal slurry mixer; the discharge port of the high-concentration coal slurry mixer is connected with the slurry inlet of the coal slurry supercritical water mixer;
a supercritical water inlet of the coal slurry supercritical water mixer is connected with a supercritical water outlet of a coal-electric unit thermodynamic system with supercritical and above parameters;
the slurry outlet of the coal slurry supercritical water mixer is connected with the slurry inlet of the supercritical reactor, the gas-solid mixture outlet of the supercritical reactor is connected with the gas-solid separation device, and the hydrogen outlet of the gas-solid separation device is connected with the hydrogen collection device.
Preferably, a high-pressure steam-driven coal slurry plunger pump and a coal slurry heat regenerator are sequentially arranged between the slurry outlet of the high-concentration coal slurry mixer and the slurry inlet of the coal slurry supercritical water mixer, wherein the steam inlet of the high-pressure steam-driven coal slurry plunger pump is connected with the steam extraction outlet of the thermodynamic system of the coal-electric machine set with supercritical and above parameters.
Preferably, the supercritical reactor is further connected with a high-pressure catalyst mixer, and a water inlet of the high-pressure catalyst mixer is connected with a high-pressure water outlet of a thermodynamic system of the coal-electric machine set with the parameters of supercritical and above.
A supercritical water hydrogen production method based on supercritical and above parameter coal-electricity unit coupling supercritical water comprises the following steps:
feeding low-pressure medium-temperature water and coal powder in a coal-electricity unit thermodynamic system with supercritical and above parameters into a supercritical and coupling hydrogen production system for mixing to obtain low-pressure high-concentration coal slurry;
supercritical water in a coal-electricity unit thermodynamic system with supercritical and above parameters is sent into a supercritical and coupling hydrogen production system and is subjected to mixed reaction with low-pressure high-concentration coal slurry to produce hydrogen.
Preferably, the supercritical and coupled hydrogen production system is shut down when any of the following conditions are met:
the minimum coal feeding quantity of the high-concentration coal slurry mixer corresponding to the minimum working power of the supercritical and coupling hydrogen production system is smaller than the difference between the maximum coal powder quantity of the coal pulverizing system and the real-time coal powder quantity of the boiler required by the boiler in the operation of the thermodynamic system of the coal-electric unit with supercritical and above parameters;
the minimum water flow of the high-concentration coal slurry mixer corresponding to the minimum working power of the supercritical and coupling hydrogen production system is smaller than the difference between the maximum pump water amount of the circulating water pump and the real-time water flow required by the boiler in the operation of the coal-electric unit thermodynamic system with the supercritical and above parameters;
the minimum supercritical water flow of the coal slurry-supercritical water mixer corresponding to the minimum working power of the supercritical and coupled hydrogen production systems is less than the difference between the maximum continuous evaporation capacity of the boiler and the required evaporation capacity corresponding to the real-time power of the high pressure cylinder in the operation of the coal-electric unit thermodynamic system with supercritical and above parameters.
Compared with the prior art, the invention has the beneficial effects that:
the supercritical and above parameter coal-electricity unit coupling supercritical water hydrogen production system provided by the invention is based on the existing supercritical and above parameter coal-electricity unit scheme, realizes poly-generation of electric power and hydrogen energy by adding the supercritical coupling hydrogen production system, does not need to destroy the corresponding equipment structure of the original coal-electricity unit, does not need to repeatedly invest redundant coal storage, transportation and coal powder production equipment systems, does not need to add excessive pumps and thermal equipment, greatly reduces the size of the corresponding slurry pump, effectively reduces the related cost of supercritical water hydrogen production, and can generate hundreds of millions of expenses by only constructing a closed coal bunker, a corresponding coal transportation route and coal grinding equipment in a million-level unit to meet the requirement of environmental protection. Meanwhile, the invention can fully utilize the residual load space of the coal-electricity unit, make the unit in the running state of high load level, improve the running level and efficiency of the coal-electricity unit, when the unit participates in peak shaving, can produce under the situation that does not reduce the boiler evaporation capacity, the effective utilization of neatly produced, reduce the generated energy, realize the flexible peak shaving, lengthen the service life of the unit.
Drawings
FIG. 1 is a general schematic diagram of a supercritical water hydrogen production system coupled with a coal-electric machine set with parameters above supercritical water.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the supercritical and above parameter coal electric unit coupled supercritical water hydrogen production system provided by the present invention comprises a supercritical and above parameter coal electric unit thermodynamic system, a supercritical coupled hydrogen production system and a valve control system, wherein:
the thermal system of the coal-electricity machine set with the supercritical and above parameters is a pulverized coal combustion boiler with the supercritical and above parameters (generally referring to steam circulation parameters, the temperature is more than 374 ℃, and the pressure is more than 22.1MPa) which are mainly adopted in the world at present, the thermodynamic system comprises main equipment including a water feed pump 1-1, a high-pressure heater 1-2, a boiler 1-3, a pulverizing system 1-4, a high-pressure cylinder 1-5, a medium-low pressure cylinder 1-6, a condensing system 1-7, a water supplementing system 1-8, a circulating water pump 1-9, fine processing equipment 1-10, a low-pressure heater 1-11 and a deaerator 1-12, wherein, the water supply system of the boiler 1-3 is composed of a water supply system 1-8, a circulating water pump 1-9, a fine processing device 1-10, a low-pressure heater 1-11 and a deaerator 1-12.
And the water outlets of the water supplementing systems 1 to 8 are sequentially connected with the water inlets of the circulating water pumps 1 to 9, the fine processing equipment 1 to 10, the low-pressure heater 1 to 11 and the deaerator 1 to 12.
The water outlet of the deaerator 1-12 is connected with the water inlet of the boiler 1-3 through the water feed pump 1-1 and the high-pressure heater 1-2.
And the discharge port of the powder preparation system 1-4 is connected with the feed port of the boiler 1-3.
The high-temperature high-pressure steam outlet of the boiler 1-3 is connected with the steam inlet of the high-pressure cylinder 1-5, and the medium-temperature medium-pressure steam outlet of the high-pressure cylinder 1-5 is connected with the medium-temperature medium-pressure steam inlet of the medium-low pressure cylinder 1-6.
The medium-temperature and medium-pressure steam outlet of the boiler 1-3 is connected with the medium-temperature and medium-pressure steam inlet of the medium-low pressure cylinder 1-6.
The high pressure cylinders 1-5 and the medium and low pressure cylinders 1-6 are connected with generators.
And the exhaust steam outlet of the medium and low pressure cylinder 1-6 is connected with a condensing system 1-7, wherein the water outlet of the condensing system 1-7 is connected with a circulating water pump 1-9.
The supercritical coupling hydrogen production system comprises a high-concentration coal slurry mixer 2-1, a high-pressure pneumatic coal slurry plunger pump 2-2, a coal slurry heat regenerator 2-3, a coal slurry-supercritical water mixer 2-4, a supercritical reactor 2-5, a high-pressure catalyst mixer 2-6, a gas-solid separation device 2-7, a hydrogen collecting device 2-8, solid-waste separator equipment 2-9, a waste treatment device 2-10 and a material return pump 2-11, wherein a discharge port of the powder preparation system 1-4 is connected with a feed port of the high-concentration coal slurry mixer 2-1; the water outlet of the deaerator 1-12 is also connected with the water inlet of the high-concentration coal slurry mixer 2-1, and the slurry outlet of the high-concentration coal slurry mixer 2-1 is connected with the slurry inlet of the coal slurry heat regenerator 2-3 through the high-pressure pneumatic coal slurry plunger pump 2-2; and the steam extraction outlet of the medium and low pressure cylinder 1-6 is connected with the steam inlet of the high-pressure steam coal slurry plunger pump 2-2.
The high-temperature slurry outlet of the coal slurry heat regenerator 2-3 is connected with the slurry inlet of the coal slurry-supercritical water mixer 2-4.
And a supercritical water inlet of the coal slurry-supercritical water mixer 2-4 is connected with a supercritical water outlet of the boiler 1-3.
The slurry outlet of the coal slurry-supercritical water mixer 2-4 is connected with the slurry inlet of the supercritical reactor 2-5; and a catalyst inlet of the supercritical reactor 2-5 is connected with a catalyst outlet of the high-pressure catalyst mixer 2-6.
The water inlet of the high-pressure catalyst mixer 2-6 is connected with the high-pressure water outlet of the high-pressure heater 1-2.
A gas-solid mixture outlet of the supercritical reactor 2-5 is connected with a gas-solid separation device 2-7, and a hydrogen outlet of the gas-solid separation device 2-7 is connected with a hydrogen collection device 2-8; and an impurity outlet of the gas-solid separation device 2-7 is connected with a solid-waste separator device 2-9 through a coal slurry heat regenerator 2-3.
The waste outlet of the solid waste separator device 2-9 is connected with a waste treatment device 2-10; and the other product outlets of the solid waste separator devices 2-9 are connected with the supercritical reactor 2-5 through a feed back pump 2-11.
And a high-temperature and high-pressure regulating valve group 3-1 is arranged on a supercritical water pipeline between the boiler 1-3 and the coal slurry-supercritical water mixer 2-4.
And a powder quantity regulating valve 3-2 is arranged on a connecting pipeline between the powder preparation system 1-4 and the high-concentration coal slurry mixer 2-1. The coal powder quantity regulating valve 3-2 is internally provided with devices for preventing coal powder at the valve group from being blocked, such as vibration beating, stirring sweeping and the like.
And a medium-temperature low-pressure regulating valve 3-3 is arranged on a connecting pipeline between the deaerator 1-12 and the high-concentration coal slurry mixer 2-1.
And a regulating valve 3-4 is arranged on a connecting pipeline between the middle and low pressure cylinders 1-6 and the high pressure pneumatic coal slurry plunger pump 2-2.
And a high-pressure medium-temperature regulating valve 3-5 is arranged on a connecting pipeline between the high-pressure heater 1-2 and the high-pressure catalyst mixer 2-6.
And catalyst quantity control valves 3-6 are arranged at the feed inlets of the high-pressure catalyst mixers 2-6.
The working principle of the invention is as follows:
the coal-electric machine set thermodynamic system with the parameters of supercritical and above has a maximum operation power P 1-max Which has a maximum continuous evaporation capacity Q corresponding to boilers 1-3 13-max When the coal-electricity unit thermodynamic system 1 with supercritical and above parameters runs in a grid-connected mode, a power P is sent from a power grid in real time 1 ，P 1 The required boiler evaporation capacity is Q 13-1 The real-time evaporation capacity of the boilers 1-3 in operation is Q 13 The coal supply quantity of the corresponding required coal pulverizing system 1-4 under the evaporation quantity of the boiler is M 14-13 The actual coal feeding amount of the coal pulverizing system 1-4 is M 14 The maximum coal feeding quantity of the coal pulverizing system is M 14-max The flow rate of the circulating water pump 1-9 required under the evaporation capacity of the boiler is Q 19-13 The circulating water pump has a maximum water pumping quantity Q 19-max The real-time flow rate of the water pumped by the circulating water pumps 1-9 is Q 19 。
The working process of the coal-electric unit thermodynamic system with the supercritical and above parameters comprises the following steps: the water pumped by the circulating water pump 1-9 sequentially enters a fine treatment device 1-10, a low-pressure heater 1-11 and a deaerator 1-12 to perform fine treatment, deaerating and low-temperature heating on the water entering the boiler 1-3, one strand of the water flows into a water feed pump 1-1 after leaving the deaerator 1-12, and the flow rate of the water is Q 11 The other flows into a high-concentration coal slurry mixer 2-1 with the flow rate of Q 21 Thus Q 11 And Q 21 Should be equal to Q 19 ，Q 11 And Q 21 The relative size of the pressure regulating valve is regulated by a medium-temperature low-pressure regulating valve 3-3. After water pumped by the circulating water pump 1-9 leaves the deaerator 1-12, one strand of water flows into the water feeding pump 1-1 to be boosted and then enters the high-pressure heater 1-2 to be further heated, and after the water flows out of the high-pressure heater 1-2, one strand of high-pressure water flows into the high-pressure catalytic reactor2-6 agent mixers with flow rate of Q 26 ，Q 26 The size of the high-pressure medium-temperature regulating valve is mainly regulated by a high-pressure water input into a cooling wall surface in a boiler 1-3 for heating, and the flow rate is Q 13 The coal powder preparation amount of the powder preparation system 1-4 is M 14 One stream of water flows into the boiler 1-3, is ignited by a burner in the boiler and heats the heated wall surface of the boiler 1-3, and the coal feeding amount of the water is equal to the coal feeding amount correspondingly required under the real-time evaporation amount of the boiler and is M 14-13 The other coal powder is conveyed to a high-concentration coal slurry mixer 2-1 from a coal powder conveying pipeline between a coal pulverizing system 1-4 and a boiler 1-3, and the coal feeding amount is M 21 Considering the adhesion and accumulation of coal dust in pipes and valves, M 14-13 And M 21 Should be less than or equal to M 14 ，M 14-13 And M 21 Is regulated by a coal dust quantity regulating valve 3-2 in the bypass. The water flow is heated in the boilers 1-3 to a power P 1 After the high-temperature high-pressure steam with required parameters flows into a high-pressure cylinder 1-5 to do work, and the flow rate is P 1 The required boiler evaporation capacity is Q 13-1 The other end is conveyed to a coal slurry-supercritical water mixer 2-4 through a supercritical water pipeline between a boiler 1-3 and a high-pressure cylinder 1-5, and the flow rate is Q 13-24 Thus Q 13-1 And Q 13-24 Should be equal to the flow Q of the input boilers 1-3 11 ，Q 13-1 And Q 24 The relative size of the bypass is adjusted by a high-temperature high-pressure adjusting valve group 3-1 in the bypass; after the high-temperature high-pressure steam works in the high-pressure cylinder 1-5, the medium-temperature medium-pressure steam flows into the medium-low pressure cylinder 1-6 to further work, part of extracted steam enters the boiler 1-3 to be reheated, and the flow rate is Q 16-13 The steam flows back to the middle and low pressure cylinder 1-6 again to do work, the working efficiency of the thermodynamic system is improved, the other part of the extracted steam is transmitted to the high-pressure steam-driven coal slurry plunger pump 2-2 through the high-temperature high-pressure auxiliary steam pipeline, and the flow Q of the extracted steam is 16-22 Controlled by a regulating valve 3-4 on a high-temperature high-pressure auxiliary steam pipeline, steam enters a middle and low pressure cylinder 1-6 and a high pressure cylinder 1-5 and then works to drive a corresponding electric system to generate electricity; the residual dead steam is discharged from the medium and low pressure cylinders 1-6 and then enters a condensing system 1-7 for cooling, and the flow rate is Q 17 The post water replenishing system 1-8 replenishes water to the system according to the real-time running state, and the water replenishing flow is Q 18 The corresponding relationship in real time should satisfy the following equation:
Q 19 ＝Q 17 +Q 18
the corresponding water flow flows into the circulating water pumps 1-9 again for boosting and pumping, and the thermodynamic system completes corresponding circulation.
The supercritical and coupling hydrogen production system is operated in a coupling way with a thermodynamic system of a coal-electricity unit with supercritical and above parameters, the quantity of coal powder entering a high-concentration coal slurry mixer 2-1 is adjusted by a coal powder quantity adjusting valve 3-2 arranged in a bypass from a coal powder conveying pipeline between 1-4 parts of a coal powder preparation system to 1-3 parts of a boiler to the high-concentration coal slurry mixer 2-1, the quantity of low-pressure water entering the high-concentration coal slurry mixer 2-1 is adjusted by a medium-temperature low-pressure adjusting valve 3-3 arranged in a bypass from a low-pressure medium-temperature water pipeline between 1-11 parts of a deaerator to 1-1 parts of a water feeding pump to the high-concentration coal slurry mixer 2-1, the coal powder is mixed with water in the high-concentration coal slurry mixer 2-1 to form low-pressure high-concentration coal slurry, and the mass fraction omega of the coal slurry is omega 21 Comprises the following steps:
ω 21 ＝M 21 /(Q 21 +M 21 )
the coal slurry leaves from a high-concentration coal slurry mixer 2-1 and is input into a high-pressure steam-driven coal slurry plunger pump 2-2, the extracted steam extracted from a medium-low pressure cylinder 1-6 is transmitted to the high-pressure steam-driven coal slurry plunger pump 2-2 through a high-temperature high-pressure auxiliary steam pipeline to drive the high-pressure steam-driven coal slurry plunger pump to act, the high-concentration coal slurry is boosted and pumped to a coal slurry heat regenerator 2-3 to be heated in the first step and flows into a coal slurry-supercritical water mixer 2-4 after being heated, the pressure of the high-concentration coal slurry is determined by the power of the high-pressure steam-driven coal slurry plunger pump 2-2, and the power of the high-pressure steam-driven coal slurry plunger pump 2-2 is mainly determined by the steam extraction amount and steam extraction parameters; after entering a coal slurry-supercritical water mixer 2-4, the high-concentration coal slurry is mixed with supercritical water from a boiler 1-3 to a supercritical water pipeline between a high-pressure cylinder 1-5 to form a feed coal slurry, and the mass coefficient omega of the coal slurry is 24 Comprises the following steps:
ω 24 ＝(M 21 +Q 13-24 )/(Q 21 +M 21 +Q 13-24 )
under the real-time condition, the supercritical reactor 2-5 should have an optimal mass coefficient omega of the coal slurry entering the furnace best If ω is 24 And omega best Adjusting the high-temperature and high-pressure adjusting valve group 3-1 and the Q value in case of phase deviation 21 Pulverized coal quantity regulating valve 3-2, regulating M 21 Medium temperature low pressure regulating valve 3-3 regulating Q 13-24 Make it reach the optimum omega best . Conveying the feed coal slurry to a supercritical reactor 2-5 for reaction to produce hydrogen; high-pressure water flows into a high-pressure catalyst mixer 2-6 from a high-pressure heater 1-2 to be mixed with a catalyst, the amount of the added catalyst is controlled by a catalyst amount control valve 3-6, the amount of the catalyst is determined by the real-time reaction state of a supercritical reactor 2-5, and Q 26 The size of the catalyst is mainly adjusted by a high-pressure medium-temperature adjusting valve 3-5, and the high-pressure catalyst solution mixed in a high-pressure catalyst mixer 2-6 is conveyed to a supercritical reactor 2-5 to react with coal slurry.
And conveying the gas-solid mixed product after the reaction in the supercritical reactor 2-5 to a gas-solid separation device 2-7 for gas-solid separation, introducing the separated hydrogen into a hydrogen collecting device 2-8, continuously conveying other products to a solid waste separator device 2-9, recovering the heat of the product by a coal slurry heat regenerator 2-3, preheating high-concentration coal slurry, introducing the waste separated in the solid waste separator device 2-9 into a waste treatment device 2-10 for subsequent treatment, and boosting the rest products by a material return pump 2-11 and returning the boosted products to the supercritical reactor 2-5 for further reaction.
The hydrogen collecting devices 2-8 are used for short-term storage of hydrogen produced by the coupling hydrogen production system, can externally burn the hydrogen and convey the hydrogen to other hydrogen storage and transportation equipment, and the internal monitoring pressure of the hydrogen collecting devices is P 28 The flow rate input from the gas-solid separation device 2-7 to the hydrogen collection device 2-8 is Q 28 At the same time, the hydrogen collecting device has an internal pressure P corresponding to the maximum hydrogen capacity 28-max When it comes to
P 28 ≥P 28-max
When the process is carried out, valves 3-1, 3-2, 3-3, 3-4, 3-5 and 3-6 are all closed, the feeding process of the supercritical coupling hydrogen production system is stopped, the residual materials of the equipment can still support the reaction to continue, and a hydrogen collecting device 2-8 carries out external combustion on the stored hydrogen, wherein the flow of the combustion hydrogen is Q Burning of When externally discharged for combustion, Q Burning of It should satisfy:
1.05Q 28 ≥Q burning of ≥Q 28
When the flow Q is input into the hydrogen collecting device 2-8 from the gas-solid separating device 2-7 28 Reduced to a certain value (flow rate Q) 28-min ) And the pressure P of the hydrogen collecting device is 2-8 28 When the pressure is less than the maximum pressure, the outward combustion is stopped, and the following relational expression is satisfied:
P 28 ＜P 28-max ，Q 28 ＜Q 28-min
wherein Q is 28-min The device is set according to the scale of the corresponding hydrogen production system.
The supercritical and above parameter coal-electricity unit coupled supercritical water hydrogen production system mainly follows the load change of the supercritical and above parameter coal-electricity unit thermodynamic system, and the residual power margin is used for supercritical and coupled hydrogen production, so that the supercritical and coupled hydrogen production system has minimum working power, and the coal feeding amount of the supercritical and coupled hydrogen production system is M 21-min The high-pressure low-temperature water amount is Q 21-min Supercritical water amount is Q 13-24-min When one of the following conditions occurs, the supercritical and coupling hydrogen production system stops feeding, the valves 3-1, 3-2, 3-3, 3-4, 3-5 and 3-6 are all closed, the system stops producing hydrogen, and the supercritical and above parameters coal-electric unit thermal system independently run:
minimum coal feeding quantity M of high-concentration coal slurry mixer 2-1 corresponding to minimum working power of supercritical and coupled hydrogen production system 21-min Less than the maximum coal powder amount M of the pulverizing system 1-4 14-max The real-time pulverized coal quantity M of the boilers 1-3 required by the boilers 1-3 in the operation of the coal-electric machine set thermodynamic system with the supercritical and above parameters 14-13 The difference between the two;
minimum water flow Q of high-concentration coal slurry mixer 2-1 corresponding to minimum working power of supercritical and coupled hydrogen production system 21-min Less than 1-9 of the maximum pump water quantity Q of the circulating water pump 19-max Real-time water flow Q required by boilers 1-3 in operation of coal-electric set thermodynamic system with supercritical and above parameters 19-13 The difference between them;
corresponding to minimum working power of supercritical and coupled hydrogen production systemMinimum supercritical water flow Q of coal slurry-supercritical water mixer 2-4 13-24-min Less than 1-3 maximum continuous evaporation capacity Q of boiler 13-max Required evaporation capacity Q corresponding to real-time power of 1-5 high-pressure cylinders in supercritical and above parameter coal-electric machine set thermodynamic system operation 13-1 The difference between them.
Claims (8)
1. A supercritical and above parameter coal-electric unit coupling supercritical water hydrogen production system is characterized by comprising:
the coal-electricity unit thermodynamic system (1) with supercritical and above parameters is used for providing supercritical water, coal powder and low-pressure medium-temperature water;
the supercritical and coupling hydrogen production system (2) is used for producing hydrogen by utilizing supercritical water, coal powder and low-pressure medium-temperature water;
the supercritical and coupling hydrogen production system (2) comprises a high-concentration coal slurry mixer (2-1), a coal slurry-supercritical water mixer (2-4), a supercritical reactor (2-5), a gas-solid separation device (2-7) and a hydrogen collection device (2-8), wherein a coal powder outlet of the supercritical and above parameter coal-electricity set thermodynamic system (1) is connected with a feed inlet of the high-concentration coal slurry mixer (2-1); a low-pressure medium-temperature water outlet of the coal-electricity unit thermodynamic system (1) with the supercritical and above parameters is connected with a water inlet of the high-concentration coal slurry mixer (2-1); the discharge hole of the high-concentration coal slurry mixer (2-1) is connected with the slurry inlet of the coal slurry-supercritical water mixer (2-4);
a supercritical water inlet of the coal slurry-supercritical water mixer (2-4) is connected with a supercritical water outlet of a coal-electric unit thermodynamic system (1) with supercritical and above parameters;
the slurry outlet of the coal slurry-supercritical water mixer (2-4) is connected with the slurry inlet of the supercritical reactor (2-5), the gas-solid mixture outlet of the supercritical reactor (2-5) is connected with the gas-solid separation device (2-7), and the hydrogen outlet of the gas-solid separation device (2-7) is connected with the hydrogen collecting device (2-8).
2. The supercritical and above parameter coal-electric unit coupling supercritical water hydrogen production system according to claim 1, characterized in that the supercritical and above parameter coal-electric unit thermodynamic system (1) comprises a water supply system, boilers (1-3) and a pulverizing system (1-4), wherein the water outlet of the water supply system is divided into two paths, one path is connected with the water inlet of the boilers (1-3), and the other path is connected with the supercritical and coupling hydrogen production system (2); the discharge port of the powder preparation system (1-4) is divided into two paths, one path is connected with the feed port of the boiler (1-3), and the other path is connected with the supercritical and coupled hydrogen production system (2);
and a supercritical water outlet of the boiler (1-3) is connected with the supercritical and coupling hydrogen production system (2).
3. The supercritical and above parameter coal-electric machine set coupling supercritical water hydrogen production system according to claim 2, characterized in that the high temperature and high pressure steam outlet of the boiler (1-3) is connected with a high pressure cylinder (1-5), the medium temperature and medium pressure outlet of the high pressure cylinder (1-5) is connected with a medium and low pressure cylinder (1-6), and the extraction steam outlet of the medium and low pressure cylinder (1-6) is connected with the supercritical and coupling hydrogen production system (2).
4. The supercritical water hydrogen production system based on coupling of supercritical and above parameters of a coal-electric unit according to claim 2 is characterized in that the water supply system comprises a water supply pump (1-1), a high-pressure heater (1-2), a water charging system (1-8), a circulating water pump (1-9), a fine processing device (1-10), a low-pressure heater (1-11) and a deaerator (1-12), wherein a water outlet of the water charging system (1-8) is connected with a water inlet of a boiler (1-3) through the circulating water pump (1-9), the fine processing device (1-10), the low-pressure heater (1-11), the deaerator (1-12), the water supply pump (1-1) and the high-pressure heater (1-2) in sequence; the water outlet of the deaerator (1-12) is also connected with a supercritical and coupling hydrogen production system (2).
5. The supercritical water hydrogen production system based on coupling of supercritical and above parameters of a coal-electric unit as claimed in claim 1, characterized in that a high-pressure steam-driven coal slurry plunger pump (2-2) and a coal slurry heat regenerator (2-3) are sequentially arranged between the slurry outlet of the high-concentration coal slurry mixer (2-1) and the slurry inlet of the coal slurry-supercritical water mixer (2-4), wherein the steam inlet of the high-pressure steam-driven coal slurry plunger pump (2-2) is connected with the steam extraction outlet of the supercritical and above parameters coal-electric unit thermodynamic system (1).
6. The supercritical and above parameter coal electric unit coupled supercritical water hydrogen production system according to claim 1, characterized in that the supercritical reactor (2-5) is further connected with a high pressure catalyst mixer (2-6), and a water inlet of the high pressure catalyst mixer (2-6) is connected with a high pressure water outlet of the supercritical and above parameter coal electric unit thermodynamic system (1).
7. A supercritical and above parameter coal-electric unit coupling supercritical water hydrogen production method is characterized in that the system based on any one of claims 1-6 comprises the following steps:
feeding low-pressure medium-temperature water and coal powder in a coal-electricity unit thermodynamic system (1) with supercritical and above parameters into a supercritical and coupling hydrogen production system (2) for mixing to obtain low-pressure high-concentration coal slurry;
supercritical water in the coal-electricity unit thermodynamic system (1) with the parameters of supercritical and above is sent into a supercritical and coupling hydrogen production system (2) to be mixed with low-pressure high-concentration coal slurry to react to produce hydrogen.
8. The supercritical water hydrogen production method by coupling the coal-electric unit with the parameters of supercritical water and above according to claim 7 is characterized in that the supercritical water hydrogen production system and the coupling hydrogen production system stop operating when any one of the following conditions is met:
the minimum coal feeding quantity of the high-concentration coal slurry mixer (2-1) corresponding to the minimum working power of the supercritical and coupling hydrogen production system is smaller than the difference between the maximum coal powder quantity of the coal pulverizing system (1-4) and the real-time coal powder quantity of the boiler (1-3) required by the boiler (1-3) in the operation of the thermodynamic system of the supercritical and above parameters coal-electric machine set;
the minimum water flow of the high-concentration coal slurry mixer (2-1) corresponding to the minimum working power of the supercritical and coupling hydrogen production system is smaller than the difference between the maximum pump water flow of the circulating water pump (1-9) and the real-time water flow required by the boiler (1-3) in the operation of the coal-electric set thermodynamic system with the supercritical and above parameters;
the minimum supercritical water flow of the coal slurry-supercritical water mixer (2-4) corresponding to the minimum working power of the supercritical and coupled hydrogen production system is less than the difference between the maximum continuous evaporation capacity of the boiler (1-3) and the required evaporation capacity corresponding to the real-time power of the high pressure cylinder (1-5) in the supercritical and above parameters coal-electric machine set thermodynamic system.
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