CN100344568C

CN100344568C - Cement clinker sintering technology and its equipment

Info

Publication number: CN100344568C
Application number: CNB2006100391617A
Authority: CN
Inventors: 缪建通
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-03-29
Filing date: 2006-03-29
Publication date: 2007-10-24
Anticipated expiration: 2026-03-29
Also published as: CN1830867A

Abstract

The present invention relates to a cement clinker sintering technology and devices thereof. The technology has a metering chamber, a water adding and stirring chamber, a combustion chamber and a cooling chamber; the devices are characterized in that the outlets of feeding devices are connected to a preheating and drying chamber; the preheating and drying chamber is connected to a draught fan through an air guiding pipe; the preheating and drying chamber is connected to the cooling chamber through a hot air mixing burner; the cooling chamber is connected to a combustion chamber through material sealing pipes; the combustion chamber is connected to the hot air mixing burner through hot air pipes. The present invention has the advantages that the cement clinker firing system fires traditional cement clinkers into preheating zones, firing zones and cooling zones of the system, and the preheating zones, the firing zones and the cooling zones are relatively separated and are organically uniform; the preheating and drying chamber, the combustion chamber, the cooling chamber and the hot air mixing burner all adopt a vertical type structure, which can greatly improve system heat transferring efficiency; simultaneously, the combustion chamber is set into a sub system which is used for firing the clinkers and reducing firing influence exerted on the clinkers from the preheating zones and the cooling zones, and therefore, the aims of fast burning and quenching of the clinkers, stable and continuous operation, automatic control, and large scale can be realized.

Description

Cement clinker sintering technology

Technical field

What the present invention relates to is that a kind of to transform traditional cement clinker firing system be brand-new cement clinker sintering technology.Belong to the technology of producing cement field.

Background technology

At present, China's Cement industry has adopted the kinds of processes technology, is divided into rotary kiln and shaft kiln two big classes generally.Rotary kiln comprises nsp kiln (being new type dry kiln), preheater kiln, dry method hollow kiln, lepol kiln, wet-process rotary kiln etc.; Be divided into native shaft kiln, ordinary shaft kiln and mechanical vertical kiln etc. in the shaft kiln.

In rotary kiln, the most advanced with nsp kiln (new type dry kiln), become the main body kiln type in the rotary kiln; In shaft kiln, be best with mechanized cement shaft kiln.In actual production, native shaft kiln is superseded substantially at present, and ordinary shaft kiln is also rare, mechanical vertical kiln account in the shaft kiln more than 90%.New dry process technology can realize maximizing, the level of automation height, and energy consumption is low, is better than mechanical vertical kiln technology greatly.All the time, because the new dry process technology investment is big, the construction period is long, the cement cost height of producing, so tempo is unhappy.Thirty years of age firer plants owing to less investment, instant effect, and product can be up to state standards, and can satisfy the demand of fundamental construction, is developed in decades.

At present, the kiln shape of the most of machine shaft kiln of China is that single horn is to be the vertical barrel type kiln below the hydraucone, and this form defective is very big.The one, influence grog and move down and draw off, especially when bell mouth angle was inappropriate, the grog after the contraction can not waltz through cooling zone and draw off, and influenced shaft kiln output; The 2nd, improper ventilation after kiln wind enters in the kiln from the bottom, is subjected to the resistance of material, and " apoplexy deficiency, limit wind surplus " can be caused greater than in the middle of the kiln in the space between kiln wall and the material in addition, the influence calcining; The 3rd, kiln inwall high more than 3 meters is arranged at kiln bottom, and to be casting liner plate become with steel is brick, and top then is built into refractory brick entirely.Operation back refractory wear is very fast, and liner plate, the wearing and tearing of steel brick are less, shaft kiln is formed at steel brick, liner plate place protrude annular steel ring together, cause the discharging difficulty, even the card kiln.

Shaft kiln calcination the most essential is the stable fire in a stove before fuel is added, make stable position and the thickness that just need control heat zone well of thermal regulation in the kiln, have only the fire in a stove before fuel is added steady, inclined to one side fire just can not appear, reduce leak living, the loss on ignition and the free calcium oxide of grog are reduced, improve clinker quality and shaft kiln output.

According to present shaft kiln kiln shape and ventilation form, do not reach the fire in a stove before fuel is added steadily, pull and stretch, the high temperature chamotte chilling of getting back not is very difficult, the workman that need have higher state of the art operates, and is careless slightly, fire in a stove before fuel is added pull and stretch and fiery partially phenomenon will occur, make shaft kiln burn till instability.

On air supply mode, most of shaft kiln is to ventilate from the bottom, promptly enters cooling zone through dumper, from bottom to top discharges from chimney through thermal zone, preheating zone.This form will inevitably cause the steam flow distributary phenomenon owing to be subjected to the influence of material resistance in the kiln.Middle part wind is few, and limit portion wind is big, because the uneven distribution of air-flow on the kiln cross section brought the difficulty that is difficult to overcome to vertical kiln operation, directly influences the cooling and the clinker quality of grog.

Influencing the equally distributed basic factor of air-flow is resistance, because solid accumulation and the influence that is subjected to the kiln wall in the kiln, the voidage of kiln periphery is always greater than the kiln middle part, like this, the gas flow of kiln periphery, flow velocity are also just greater than the kiln middle part, this has technical barrier to be overcome " apoplexy deficiency, the limit wind surplus " that come out in the vertical kiln operation for many years just to have occurred.

Summary of the invention

The objective of the invention is to defective at the existence of shaft kiln prior art, a kind of cement clinker sintering technology and equipment of brand new are proposed, it is low that it has effectively overcome existing in prior technology system heat transfer efficiency, preheating zone, cooling zone are big to the influence that grog burns till, and the fast burning chilling, steady and continuous operation that can't realize grog be defective such as control and maximization automatically.

Technical solution of the present invention: cement clinker sintering technology, it is characterized in that branch one, complete black meal enter the raw material silo of weighing, measure by the current stabilization measuring apparatus, enter the raw material whipping appts again and add water and stir, enter the pan-pelletizer balling-up; By the pellet e Foerderanlage, send into the oven dry of preheating drying shed; Two, Hong Gan pellet enters the combustion chamber and blasts under the situation of sufficient oxygen at the combustion chamber gas blower, burns; Three, pellet burning finishes, and grog enters cooling room by dipleg, blasts at cooling air blower under the help of cold wind to cool off, and is transferred out to the grog e Foerderanlage down by tremie pipe again.

Cement clinker calcination equipment, its structure are that the outlet of feeding unit connects the preheating drying shed, and the preheating drying shed joins by induced exhaust and induced draft fan; The preheating drying shed joins by hot gas mixing burner and cooling room; Cooling room joins by dipleg and combustion chamber; The combustion chamber joins by heating duct and hot gas mixing burner.

Advantage of the present invention: this cement clinker sintering technology and equipment thereof, with the preheating zone in traditional cement clinker sintering technology and the equipment thereof, clinkering zone, cooling zone relative separation organic unity again, preheating drying shed, combustion chamber, cooling room, hot gas mixing burner all adopt vertical structure, can greatly improve system's heat transfer efficiency, simultaneously the combustion chamber is set at a sub-system, being used for grog burns till, the influence that minimizing preheating zone, cooling zone burn till grog, thus realize that really the fast burning chilling of grog, steady and continuous operation realize control automatically and maximization.

Description of drawings

Accompanying drawing 1 is the embodiments of the invention structural representations

Among the figure 1 is raw material silo, the 2nd, current stabilization measuring apparatus, the 3rd, material water whipping appts, the 4th, pan-pelletizer, the 5th, pellet e Foerderanlage, the 6th, preheating drying shed, the 7th, combustion chamber, the 8th, cooling room, the 9th, heating duct, the 10th, hot gas mixing burner, the 11st, dipleg, the 12nd, combustion chamber gas blower, the 13rd, cooling room gas blower, the 14th, tremie pipe, the 15th, grog transfer roller, the 16th, induced exhaust, the 17th, tornado dust collector, the 18th, fly-ash separator, the 19th, induced draft fan, the 20th, chimney.

Embodiment

Contrast accompanying drawing 1, its structure is that the outlet of feeding unit connects preheating drying shed 6, preheating drying shed 6 joins by induced exhaust 16 and induced draft fan 19; Preheating drying shed 6 joins by hot gas mixing burner 10 and cooling room 8; Cooling room 8 joins by dipleg 11 and combustion chamber 7; Combustion chamber 7 joins by heating duct 9 and hot gas mixing burner 10.

Described preheating drying shed 6 joins by induced exhaust 16 and tornado dust collector 17; Tornado dust collector 17 join with fly-ash separator 18, and fly-ash separator 18 joins with induced draft fan 19, and induced draft fan 19 connects chimney 20.

Described cooling room 8 joins by tremie pipe 14 and grog transfer roller 15.

Described preheating drying shed 6, combustion chamber 7, cooling room 8 are respectively independent device.

Described feeding unit is formed by raw material silo 1, current stabilization measuring apparatus 2, material water whipping appts 3, pan-pelletizer 4, pellet e Foerderanlage 5 serial connections.

A kind of brand-new cement clinker production system is made up of pre-watering granulation machine, preheating drying shed, combustion chamber, cooling room, hot gas mixing burner, dust-removal system and automatic control system.The black meal ball of making is preheated oven dry in the preheating drying shed, in the combustion chamber, finish cement clinker and burn till reaction, the grog that sinters carries out fast fully cooling through cooling room again, hot gas source and combustiblematerials that combustion chamber and cooling room reclaim carry out secondary combustion in the hot gas mixing burner, hot gas flow is for preheating drying shed preheating oven dry pellet, and waste gas is handled through dust-removal system.

Production technique of the present invention:

Complete black meal enters the raw material silo of weighing, and is measured by the current stabilization measuring apparatus, enters the raw material whipping appts again and adds water and stir, and enters the pan-pelletizer balling-up; By the pellet e Foerderanlage, send into the oven dry of preheating drying shed; The pellet of oven dry enters the combustion chamber and blasts under the situation of sufficient oxygen at the combustion chamber gas blower, burn and (make stable position and the thickness that just need control heat zone well of thermal regulation in the kiln, inclined to one side fire just can not occur, reduce to leak and give birth to, the loss on ignition and the free calcium oxide of grog are reduced, improve clinker quality and shaft kiln output).Pellet burning finishes, and grog enters cooling room by dipleg, blasts at cooling air blower under the help of cold wind to cool off (free calcium oxide of grog is reduced, improve clinker quality and shaft kiln output).By tremie pipe, transfer out to the grog e Foerderanlage down again.

Cooling air blower blasts cold wind and enters cooling room, cold wind heats up by the cooling grog, hot blast adds the hot waste gas of being emerged by the combustion chamber, (cooling air blower blasts oxygen to enter the hot gas hybrid combustor together, contain unburned carbon monoxide and other combustible gas in the hot waste gas that comes out in the combustion chamber, in the combustion chamber internal combustion, the burning room temp rises, effectively utilize preheating, cut down the consumption of energy); High-temperature gas is dried the indoor raw material ball of prebake in the combustion chamber, reduces the pellet water content, and grog burns till coal consumption in the saving combustion chamber, saves the production coal consumption.

Remaining gas and molecule in the preheating drying shed, by induced exhaust, in tornado dust collector, it is bigger to select particulate, enters raw material silo.All the other molecules under collecting under the wind-force of induced draft fan, enter raw material silo by fly-ash separator (reducing pm emission concentration, economical environment-protective).All the other waste gas are then by smoke stack emission.

The heat of a whole set of technology has a good recycle, greatly reduces grog and burns till and use coal, cuts down the consumption of energy.In the gas of discharging, do not have harmful molecule, help environmental protection greatly.

Claims

1, cement clinker sintering technology is characterized in that this processing step is divided into, one, complete black meal enters the raw material silo of weighing, measure by the current stabilization measuring apparatus, enter the raw material whipping appts again and add water and stir, enter the pan-pelletizer balling-up, by the pellet e Foerderanlage, send into the oven dry of preheating drying shed; Two, Hong Gan pellet enters the combustion chamber and blasts under the situation of sufficient oxygen at the combustion chamber gas blower, burns; Three, pellet burning finishes, and grog enters cooling room by dipleg, blasts at cooling air blower under the help of cold wind to cool off, and is transferred out to the grog e Foerderanlage down by tremie pipe again.

2, cement clinker sintering technology according to claim 1, it is characterized in that cooling air blower blasts cold wind and enters cooling room, cold wind heats up by the cooling grog, hot blast adds the hot waste gas of being emerged by the combustion chamber, enter the hot gas hybrid combustor together, high-temperature gas is dried the indoor raw material ball of prebake in the combustion chamber, reduces the pellet water content.

3, cement clinker sintering technology according to claim 1, it is characterized in that remaining gas and molecule in the preheating drying shed, pass through induced exhaust, in tornado dust collector, it is bigger to select particulate, enters raw material silo, all the other molecules pass through fly-ash separator, under collecting under the wind-force of induced draft fan, enter raw material silo, all the other waste gas are then by smoke stack emission.