CN209762728U - Flue gas desulfurization waste water conveying and discharging device - Google Patents

Abstract

The utility model discloses a flue gas desulfurization waste water conveying and discharging device, which comprises a return water buffer tank, a waste water conveying pump and a valve, wherein the input end of the waste water conveying pump is connected with a waste water discharging pipeline from the bottom of a desulfurization tower, the output end of the waste water conveying pump is connected with a flue gas desulfurization waste water conveying pipeline through an eighth valve and a ninth valve in sequence, and a mixer is arranged on the pipeline; the non-purified wind pipeline is connected with the left side part of the water return buffer tank through a first valve, a second valve, a third valve, a fourth valve and a flowmeter in sequence, the top part of the water return buffer tank is connected with a water return prevention line, and the outer end of the water return prevention line is connected with the mixer through a fifth valve, a sixth valve and a seventh valve in sequence. The utility model discloses utilize the blender on the flue gas desulfurization waste water pipeline, make the abundant oxidation of oxidizable thing in oxygen and the waste water in the non-purified wind, replace and fall the COD device alone, make flue gas desulfurization waste water COD index reduce and control, simplified technology, the risk that waste water had been stopped basically to return process air system is prevented the return water design by three, reaches the purpose of system steady operation.

Description

Flue gas desulfurization waste water conveying and discharging device

Technical Field

The utility model relates to a flue gas desulfurization waste water is carried and is arranged device outward belongs to the oil refining and the outer technical field that arranges of chemical industry flue gas desulfurization waste water.

Background

At present, the environmental protection emission requirement standard of chemical flue gas desulfurization waste water in petroleum refining is strict, a flue gas desulfurization device is a necessary device, the Chemical Oxygen Demand (COD) index of waste water is a hard index, and the emission must reach the standard. Therefore, along with the increasingly strict environmental protection management, the flue gas is added with a flue gas desulfurization device afterwards, and a large amount of equipment such as an aeration tank, a pump and the like are mostly installed for COD control of the flue gas desulfurization wastewater to reduce the COD of the flue gas desulfurization wastewater. The investment and operation cost is very high, and the operation is complex, so that a flue gas desulfurization wastewater conveying and discharging device with low operation requirement, simple process and low operation cost is urgently needed.

Disclosure of Invention

The utility model aims at providing a flue gas desulfurization waste water carries outer discharge apparatus to the defect that prior art exists.

The technical scheme is as follows: the flue gas desulfurization wastewater conveying and discharging device comprises a backwater buffer tank, a wastewater conveying pump and a valve, wherein the input end of the wastewater conveying pump is connected with a wastewater discharging pipeline from the bottom of a desulfurization tower, the output end of the wastewater conveying pump is sequentially connected with a flue gas desulfurization wastewater conveying pipeline through an eighth valve and a ninth valve, and a mixer is arranged on the flue gas desulfurization wastewater conveying pipeline; the non-purified wind pipeline is connected with the left side part of the backwater buffer tank through a first valve, a second valve, a third valve, a fourth valve and a flowmeter in sequence, the top part of the backwater buffer tank is connected with a backwater preventing line, and the outer end of the backwater preventing line is connected with the mixer through a fifth valve, a sixth valve and a seventh valve in sequence; one end of a tenth valve is connected to a pipeline between the third valve and the fourth valve, and the other end of the tenth valve is connected with a non-purified wind coming pipeline; and an eleventh valve is connected between the pipeline on the left side of the fifth valve and the pipeline on the right side of the seventh valve.

And a liquid level meter is arranged on the right side part of the return water buffer tank.

The first valve, the third valve, the fifth valve, the seventh valve, the eighth valve, the tenth valve and the eleventh valve are gate valves; the second valve and the sixth valve are both regulating valves; and the fourth valve and the ninth valve are check valves.

The water return preventing line is made of a pipeline which is erected upwards for 25-35 meters from the top of the water return buffer tank and then folded downwards to form a U-shaped structure.

The mixer is a ZW type tubular static mixer.

Compared with the prior art, the utility model, have following advantage: reasonable in design, moreover, the steam generator is simple in structure, it sets up the blender on flue gas desulfurization waste water pipeline, make the oxygen in the non-purified wind of pouring into can be abundant with the oxidizable thing in the waste water fully oxidize, replace the complete set alone and fall the COD device, make flue gas desulfurization waste water COD index reduce and control, reach and reduce flue gas desulfurization waste water COD equipment in a large number, simplify technology, energy-conserving low-cost operation's purpose, the risk of waste water backtracking technology air system has basically been stopped in three anti-water return designs, reach the purpose of system steady operation.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Detailed Description

Referring to fig. 1, the flue gas desulfurization wastewater conveying and discharging device comprises a return water buffer tank, a wastewater conveying pump and a valve, wherein the input end of the wastewater conveying pump 14 is connected with a wastewater discharge pipeline 18 from the bottom of a desulfurization tower, the output end of the wastewater conveying pump 14 is connected with a flue gas desulfurization wastewater conveying pipeline 19 through an eighth valve 8 and a ninth valve 9 in sequence, and a mixer 15 is arranged on the flue gas desulfurization wastewater conveying pipeline 19; the non-purified wind pipeline 17 is connected with the left side part of the water return buffer tank 13 through a first valve 1, a second valve 2, a third valve 3, a fourth valve 4 and a flowmeter 12 in sequence, the top part of the water return buffer tank 13 is connected with a water return preventing line 16, and the outer end of the water return preventing line 16 is connected with a mixer 15 through a fifth valve 5, a sixth valve 6 and a seventh valve 7 in sequence; one end of a tenth valve 10 is connected to a pipeline between the third valve 3 and the fourth valve 4, and the other end of the tenth valve 10 is connected to a non-purified wind incoming pipeline 17; an eleventh valve 11 is connected between the pipeline on the left side of the fifth valve 5 and the pipeline on the right side of the seventh valve 7. And a liquid level meter 20 is arranged on the right side part of the return water buffer tank 13. The first valve 1, the third valve 3, the fifth valve 5, the seventh valve 7, the eighth valve 8, the tenth valve 10 and the eleventh valve 11 are gate valves; the second valve 2 and the sixth valve 6 are both regulating valves; the fourth valve 4 and the ninth valve 9 are both check valves. The water return preventing line 16 is made of a pipeline which is erected upwards by 25-35 meters from the top of the water return buffer tank 13 and then folded downwards to form a U-shaped structure. The mixer 15 is a ZW type tubular static mixer.

The COD-reducing non-purified wind with the pressure of about 0.6MPa in the non-purified wind coming pipeline 17 enters the mixer 15 in the flue gas desulfurization wastewater conveying pipeline 19 through the first valve 1, the second valve 2, the third valve 3, the fourth valve 4, the flowmeter 12, the backwater buffer tank 13, the backwater preventing line 16, the fifth valve 5, the sixth valve 6 and the seventh valve 7 to be mixed with high-COD wastewater, the pipeline is generally about 500 meters at the shortest distance, the length of the pipeline is 2000 meters, the oxygen in the non-purified wind and the reducing substances (organic substances, nitrite, sulfide, ferrite and the like) in the wastewater are fully mixed and reacted in a long-distance pipeline from the sewage treatment plant, and the effect is far higher than that of a single set of COD-reducing device.

The flue gas desulfurization waste water conveying pipeline 19 at the outlet of the flue gas desulfurization waste water conveying pump 14 is of a large pipe diameter, the pump lift is designed to be large in flow and low in lift, the pressure in the pipeline is as low as possible, the pressure in the non-purified wind coming pipeline 17 is about 0.6MPa, the pressure in the flue gas desulfurization waste water conveying pipeline 19 is 0.3-0.4 MPa, the pressure difference is at least 0.2MPa, and the injection amount of the non-purified wind is controlled to be adjusted through the second valve 2 according to the COD index displayed by the COD online measuring instrument at the outlet of the sewage plant, so that the technological requirements are met.

It should be noted that, in order to prevent the reduction of the fluctuating pressure during the operation of the non-purified wind pressure, which may cause the waste water to flow backwards in the non-purified wind system, two backwater prevention designs are adopted in addition to the check valve of the fourth valve 4 installed on the pipeline. The first way is that: when waste water back-stringed, earlier through preventing return water line 16, prevent return water line 16 and rely on flue gas desulfurization tower fixed mounting, high 30 meters, only when 19 pressure of flue gas desulfurization waste water pipeline is higher than non-purified wind pressure 0.3MPa, non-purified wind pressure fluctuation can not be low to this warning line basically on the technology, and the second is said: and a water return buffer tank 13, wherein when the pressure of the flue gas desulfurization wastewater conveying pipeline 19 is higher than the non-purified air pressure by 0.3MPa, the wastewater flows backwards and passes through a water return prevention line 16 and then enters the water return buffer tank 13, and when the water level is observed by a liquid level meter 20 arranged on the water return buffer tank 13, the sixth valve 6 is quickly cut off. The three-way backwater prevention design basically avoids the risk of the wastewater returning to the process air system. The water return preventing line 16 is connected with the water return buffer tank 13 and is only fixed on the desulfurizing tower, and the water return preventing line has no relation with the desulfurizing tower in terms of process flow. The utility model discloses in level gauge 20 and sixth valve 6 can set up to the linkage, when having the water level that level gauge 20 detected, the start-up interlock protection returns, cuts off sixth valve 6 fast.

Claims (5)

1. Outer device of arranging is carried to flue gas desulfurization waste water, including return water buffer tank, waste water delivery pump and valve, its characterized in that: the input end of the waste water conveying pump is connected with a waste water discharge pipeline from the bottom of the desulfurization tower, the output end of the waste water conveying pump is sequentially connected with a flue gas desulfurization waste water conveying pipeline through an eighth valve and a ninth valve, and a mixer is arranged on the flue gas desulfurization waste water conveying pipeline; the non-purified wind pipeline is connected with the left side part of the backwater buffer tank through a first valve, a second valve, a third valve, a fourth valve and a flowmeter in sequence, the top part of the backwater buffer tank is connected with a backwater preventing line, and the outer end of the backwater preventing line is connected with the mixer through a fifth valve, a sixth valve and a seventh valve in sequence; one end of a tenth valve is connected to a pipeline between the third valve and the fourth valve, and the other end of the tenth valve is connected with a non-purified wind coming pipeline; and an eleventh valve is connected between the pipeline on the left side of the fifth valve and the pipeline on the right side of the seventh valve.

2. The flue gas desulfurization wastewater conveying and discharging device of claim 1, characterized in that: and a liquid level meter is arranged on the right side part of the return water buffer tank.

3. The flue gas desulfurization wastewater conveying and discharging device of claim 1, characterized in that: the first valve, the third valve, the fifth valve, the seventh valve, the eighth valve, the tenth valve and the eleventh valve are gate valves; the second valve and the sixth valve are both regulating valves; and the fourth valve and the ninth valve are check valves.

4. The flue gas desulfurization wastewater conveying and discharging device of claim 1, characterized in that: the water return preventing line is made of a pipeline which is erected upwards for 25-35 meters from the top of the water return buffer tank and then folded downwards to form a U-shaped structure.

5. The flue gas desulfurization wastewater conveying and discharging device of claim 1, characterized in that: the mixer is a ZW type tubular static mixer.