Gasification grey water recovery system

Abstract

The utility model discloses a gasified grey water recovery system, belongs to coal gasification equipment, and aims to solve the technical problem of how to reduce the risk of scaling, pollution and blockage of grey water in cyclic utilization caused by high hardness and turbidity of the grey water and realize zero discharge of the grey water at the same time. According to the technical scheme, the device comprises a static mixer, a settling tank, a grey water tank, an electric reaction tank, an alkali adding reaction tank, a carbon dioxide reaction tank, a sedimentation tank, a water producing tank, a deaerator and a press filter, wherein the inlet end of the static mixer is respectively communicated with a black water inlet pipe and a flocculating agent feeding pipe; the outlet end of the static mixer is communicated with the settling tank through a settling tank water inlet pipe, the outlet end of the bottom of the settling tank is communicated with the press filter, and a grey water outlet pipe is arranged at the upper position of the middle of the settling tank and is divided into two paths: one path is communicated with the grey water tank through a grey water tank water inlet pipe; and the other path sequentially enters an electric reaction tank, an alkali adding reaction tank, a carbon dioxide reaction tank, a sedimentation tank and a water producing tank through a reaction tank water inlet pipe.

Description

Technical Field

[0001] The utility model relates to coal gasification equipment, in particular to a gasification ash water recovery system. Background Art

[0002] In the new coal gasification process for producing synthetic ammonia, coal and oxygen react within the gasifier combustion chamber to produce a crude synthesis gas primarily composed of CO and H2. The non-combustible ash and some unreacted carbon particles in the coal form ash residue. During the quenching and scrubbing of the crude synthesis gas in the gasifier's quenching chamber, ash and residue entrained in the crude synthesis gas enter the quenching and scrubbing waters, forming blackwater. This blackwater is typically depressurized and fed into a flash evaporation system. After heat is recovered from the blackwater, the high-solids blackwater undergoes flocculation and sedimentation, becoming graywater. After treatment, the graywater is fed to a deaerator to remove dissolved oxygen and other gases, and then returned to the system for recycling as quenching and flushing water, saving energy.

[0003] However, in traditional processes, the common treatment process for gray water is to add flocculants. Flocculants are added to the water inlet pipe of the sedimentation tank to remove most of the suspended matter in the water, and dispersants are added to the gray water tank to prevent scaling ions from scaling inside the equipment, thereby avoiding affecting the normal operation of the equipment. Since dispersants cannot fundamentally remove scaling ions, to prevent scaling ions from enriching and concentrating in the system, gray water is continuously discharged. The total amount of gray water is 544m 3 / h, the gray water discharge volume is 100-150m 3 / h, the actual circulation volume is only 400m 3 / h or so, the insufficient circulation volume needs to be supplemented by desalted water, which consumes a lot of water energy.

[0004] At the same time, traditional greywater treatment processes still suffer from high hardness and turbidity, which can easily lead to scaling in deaerators, gasifier chill chambers, flushing equipment, and flushing pipelines. Long-term operation can cause equipment bubbling and deformation, increase the incidence of equipment failures, shorten equipment lifespan, and increase system operating costs.

[0005] Therefore, how to reduce the risk of scaling and clogging of gray water during recycling due to the high hardness and turbidity of gray water, and at the same time achieve zero gray water discharge is a technical problem that needs to be solved urgently. Summary of the Invention

[0006] The technical task of the utility model is to provide a gasification ash water recovery system to solve the problem of how to reduce the risk of scaling and clogging of ash water in recycling due to high hardness and turbidity of ash water, while achieving zero discharge of ash water.

[0007] The technical task of the utility model is achieved in the following way: a gasification ash water recovery system includes a static mixer, a sedimentation tank, an ash water tank, an electric reaction tank, an alkali reaction tank, a carbon dioxide reaction tank, a sedimentation tank, a water production tank, a deaerator and a filter press, the inlet end of the static mixer is respectively connected to a black water inlet pipe and a flocculant feed pipe, the outlet end of the static mixer is connected to the sedimentation tank through a sedimentation tank inlet pipe, the outlet end of the sedimentation tank bottom is connected to the filter press, a ash water outlet pipe is provided at the upper middle part of the sedimentation tank, and the ash water outlet pipe is divided into two routes: one route is connected to the ash water tank through the ash water tank inlet pipe; the other route enters the electric reaction tank, the alkali reaction tank, the carbon dioxide reaction tank, the sedimentation tank and the water production tank in sequence through the reaction tank inlet pipe, a water production lift pump is provided on the pipeline connecting the water production tank and the deaerator, the inlet end of the water production lift pump is connected to the water production tank through the water production tank outlet pipe, and the outlet end of the water production lift pump is connected to the deaerator through the water production lift pump outlet pipe;

[0008] An ash water pump is provided on the pipeline connecting the ash water tank and the deaerator. The inlet end of the ash water pump is connected to the outlet end of the ash water tank through the ash water pump inlet pipe, and the outlet end of the ash water pump is connected to the inlet end of the deaerator through the ash water pump outlet pipe.

[0009] Preferably, the bottom of the sedimentation tank is funnel-shaped, a sewage outlet is provided at the bottom of the funnel-shaped sedimentation tank, a sedimentation tank ash rake is provided in the sedimentation tank, the sewage outlet is located below the sedimentation tank ash rake and a substrate pump is provided on the pipeline connecting the sewage outlet and the filter press, the inlet end of the substrate pump is connected to the sedimentation tank through the substrate pump inlet pipe, and the outlet end of the substrate pump is connected to the filter press through the substrate pump outlet pipe.

[0010] More preferably, a sewage pipe is provided at the bottom of the gray water tank, and the sewage pipe is arranged opposite to the gray water pump inlet pipe.

[0011] More preferably, the inlet end of the electric reaction cell is connected to the reaction cell water inlet pipe and the industrial air delivery pipe respectively, and the outlet end of the electric reaction cell is connected to the alkali addition reaction cell;

[0012] Among them, a regulating valve II is provided on the water inlet pipe of the reaction tank, and a flow meter is provided on the regulating valve II.

[0013] More preferably, the inlet end of the alkali addition reaction tank is provided with an industrial air delivery pipe and an alkali unloading pump, and the outlet end of the alkali addition reaction tank is connected to the carbon dioxide reaction tank; a pH meter I is provided in the alkali addition reaction tank;

[0014] Wherein, the inlet end of the alkali unloading pump is connected with the inlet pipe of the alkali unloading pump, the outlet end of the alkali unloading pump is connected with one end of the outlet pipe of the alkali unloading pump, the other end of the outlet pipe of the alkali unloading pump is provided with an alkali tank, the outlet end of the alkali tank is connected with one end of the inlet pipe of the alkali adding metering pump, the other end of the inlet pipe of the alkali adding metering pump is provided with an alkali adding metering pump, and the outlet end of the alkali adding metering pump is connected with the alkali adding reaction tank through the outlet pipe of the alkali adding metering pump;

[0015] A Y-type filter I is provided on the inlet pipe of the alkali adding metering pump.

[0016] More preferably, the inlet end of the carbon dioxide reaction tank is connected to a carbon dioxide inlet pipe, on which a pressure gauge I, a regulating valve I and a pressure gauge II are sequentially arranged; a reaction tank agitator is arranged in the carbon dioxide reaction tank; and the outlet end of the carbon dioxide reaction tank is connected to the inlet end of the sedimentation tank.

[0017] More preferably, the inlet end of the water production pool is connected to an industrial air delivery pipe and an acid discharge pump, and the outlet end of the water production pool is connected to a deaerator through a water production pool outlet pipe; a pH meter II is provided in the water production pool;

[0018] The inlet end of the acid unloading pump is provided with an acid unloading pump inlet pipe, the outlet end of the acid unloading pump is connected to the acid tank through the acid unloading pump outlet pipe, the outlet end of the acid tank is connected to the acid adding metering pump through the acid adding metering pump inlet pipe, and the outlet end of the acid adding metering pump is connected to the water production pool through the acid adding metering pump outlet pipe;

[0019] A Y-type filter II is provided on the inlet pipe of the acid addition metering pump.

[0020] More preferably, the electric reaction cell, alkali reaction cell, carbon dioxide reaction cell and sedimentation tank are all provided with a funnel-shaped slag discharge hopper at the lower end, a slag discharge pipe is provided at one side of the bottom of the slag discharge hopper, and a program-controlled valve is provided on the slag discharge pipe;

[0021] Among them, a sludge pool is set below the slag discharge hopper, one end of the slag discharge pipe is connected to the slag discharge hopper, and the other end of the sludge discharge pipe is connected to the inlet end of the sludge pool. The outlet end of the sludge pool is connected to the filter press through a sludge conveying pipe, and a sludge conveying pump is set on the sludge conveying pipe.

[0022] More preferably, the inlet end of the filter press is connected to the sludge conveying pipe and the substrate pump outlet pipe, and the outlet end of the filter press is provided with a filter cake output pipe.

[0023] More preferably, the inlet end of the deaerator is further provided with a water supply pipe, the outlet end of the deaerator is provided with a deaerator water pump, the inlet end of the deaerator water pump is connected to the deaerator through the deaerator water inlet pipe, and the outlet end of the deaerator water pump is provided with a deaerator water outlet pipe.

[0024] The utility model of a gasification ash water recovery system has the following advantages:

[0025] (1) In the present invention, the black water with a high solid content coming out of the gasification flash evaporation system is mixed with a flocculant in a static mixer and then enters the sedimentation tank. After the black water entering the sedimentation tank is flocculated and precipitated, the clarified water on the upper part of the sedimentation tank overflows and is divided into two paths by gravity: one path enters the gray water tank, and the gray water in the gray water tank is pressurized by the gray water pump and then sent to the deaerator; the other path enters the electric reaction tank, the alkali reaction tank, the CO2 reaction tank, the sedimentation tank, and the water production tank in sequence, and the gray water is subjected to hardness removal and turbidity reduction treatment, and the produced water is pressurized by the water production lifting pump and then sent to the deaerator; the sludge generated in the process of hardness removal and turbidity reduction is transported to the factory filter press by the sludge delivery pump for filter pressure treatment; the two paths of gray water are mixed in the deaerator, and after the dissolved oxygen and other gases in the gray water circulation process are removed, they are pressurized by the deaeration water pump and then returned to the system for recycling as quenching water and flushing water, saving energy;

[0026] (2) In this utility model, the solids and water at the bottom of the sedimentation tank are pumped to the filter press through the substrate pump. The sludge generated during the hardness and turbidity reduction process is transported to the filter press through the sludge transfer pump. The solids in the filter press are filtered to form a fine residue filter cake, which is then transported out of the boundary area by truck for sale.

[0027] (3) In order to accelerate the sedimentation and separation speed of solids in black water in the sedimentation tank, the utility model needs to add a flocculant to the black water. The flocculant and black water are mixed in a static mixer and then enter the sedimentation tank. At the same time, a slowly movable sedimentation tank rake is installed in the sedimentation tank to send the settled solids to the outlet at the bottom of the sedimentation tank.

[0028] (4) The reaction tank of the utility model is electrified, and under the action of the electric field, the insoluble matter in the grey water is caused to produce flocs and precipitate from the water; and the addition and subtraction reaction tank adds liquid alkali, so that the calcium and magnesium ions in the grey water react with the liquid alkali to form precipitates or tiny particles, which are precipitated from the water; and CO2 gas is introduced into the carbon dioxide reaction tank to increase the carbonate content in the grey water, thereby better removing the calcium hardness in the grey water. At the same time, an acid metering pump is set in the water production tank, and concentrated sulfuric acid can be appropriately added to the water production tank according to the needs of the grey water to adjust the pH value of the produced water;

[0029] (5) The utility model is equipped with a slag hopper under each reaction tank and sedimentation tank, which discharges the sewage in the slag hopper into the sludge tank at a regular time. When the sludge in the tank reaches a certain liquid level, the sludge delivery pump automatically starts to deliver it to the filter press;

[0030] (6) The utility model effectively removes the hardness and turbidity in the gray water, avoids the occurrence of structural problems such as equipment and pipelines, and ensures long-term and stable operation of the device;

[0031] (7) After the gray water of the utility model is de-hardened and de-turbid, it is added to the deaerator for recycling. The replenishment amount of desalted water in the deaerator can be reduced from 120m3 / h to 0, achieving zero discharge of wastewater, which has a good environmental benefit;

[0032] (8) The utility model effectively reduces the amount of desalted water used in the deaerator and saves energy;

[0033] (IX) The utility model adopts electric field and liquid alkali process to remove hardness and turbidity of grey water, which will not add other polluting components such as CL-;

[0034] (10) The utility model has a reasonable design and only performs hardness and turbidity reduction treatment on part of the gray water in the system, which can not only meet the hardness and turbidity requirements when recycling gray water, but also effectively reduce the investment in hardness removal equipment and save costs.

[0035] Therefore, the utility model has the characteristics of reasonable design, simple structure, easy processing, small size, convenient use, and multiple uses, and thus has good promotion and use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below with reference to the accompanying drawings.

[0037] Attachment Figure 1 This is a structural diagram of the gasification ash water recovery system.

[0038] In the figure: 1. Sedimentation tank, 2. Ash water tank, 3. Electric reaction tank, 4. Alkali reaction tank, 5. Carbon dioxide reaction tank, 6. Reaction tank agitator, 7. Sedimentation tank, 8. Water production tank, 9. Sludge tank, 10. Deaerator, 11. Filter press, 12. Alkali tank, 13. Acid tank, 14. Ash water pump, 15. Water production lift pump, 16. Sludge delivery pump, 17. Deaeration water pump, 18. Substrate pump, 19. Alkali unloading pump, 20. , alkali metering pump, 21, acid unloading pump, 22, acid metering pump, 23, black water inlet pipe, 24, gray water outlet pipe, 25, reaction tank inlet pipe, 26, gray water tank inlet pipe, 27, water production tank outlet pipe, 28, water production lift pump outlet pipe, 29, slag discharge pipe, 30, sludge conveying pipe, 31, gray water pump inlet pipe, 32, gray water pump outlet pipe, 33, deaeration water pump inlet pipe, 34, deaeration water pump outlet pipe, 35 , substrate pump inlet pipe, 36, industrial air delivery pipe, 37, carbon dioxide inlet pipe, 38, alkali unloading pump inlet pipe, 39, alkali unloading pump outlet pipe, 40, alkali metering pump inlet pipe, 41, alkali metering pump outlet pipe, 42, acid unloading pump inlet pipe, 43, acid unloading pump outlet pipe, 44, acid metering pump inlet pipe, 45, acid metering pump outlet pipe, 46, Y-type filter I, 47, Y-type filter II, 48, programmable Valve, 49, pH meter I, 50, pH meter II, 51, regulating valve I, 52, pressure gauge I, 53, pressure gauge II, 54, regulating valve II, 55, flow meter, 56, sedimentation tank ash rake, 57, slag hopper, 58, substrate pump outlet pipe, 59, static mixer, 60, sedimentation tank water inlet pipe, 61, flocculant feed pipe, 62, sewage pipe, 63, water supply pipe, 64, filter cake output pipe, 65, sewage outlet. DETAILED DESCRIPTION

[0039] A gasification ash water recovery system of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] In the description of this utility model, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are used to indicate positions or locations based on the positions or locations shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific manner, and therefore should not be construed as limitations of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0042] Example:

[0043] The utility model is a gasification ash water recovery system, whose structure includes a static mixer 59, a sedimentation tank 1, an ash water tank 2, an electric reaction pool 3, an alkali reaction pool 4, a carbon dioxide reaction pool 5, a sedimentation tank 7, a water production pool 8, a deaerator 10 and a filter press 11. The inlet end of the static mixer 59 is respectively connected to the black water inlet pipe 23 and the flocculant feed pipe 61, the outlet end of the static mixer 59 is connected to the sedimentation tank 1 through the sedimentation tank inlet pipe 60, the bottom outlet end of the sedimentation tank 1 is connected to the filter press 11, and the upper middle part of the sedimentation tank 1 is connected to the filter press 11. The gray water outlet pipe 24 is divided into two routes: one route is connected to the gray water tank 2 through the gray water tank inlet pipe 26; the other route enters the electric reaction tank 3, the alkali reaction tank 4, the carbon dioxide reaction tank 5, the sedimentation tank 7 and the water production tank 8 in sequence through the reaction tank inlet pipe 25. The pipeline connecting the water production tank 8 and the deaerator 10 is installed with a water production lift pump 15. The inlet end of the water production lift pump 15 is connected to the water production tank 8 through the water production tank outlet pipe 27, and the outlet end of the water production lift pump 15 is connected to the deaerator 10 through the water production lift pump outlet pipe 28;

[0044] An ash water pump 14 is installed on the pipeline connecting the ash water tank 2 and the deaerator 10. The inlet end of the ash water pump 14 is connected to the outlet end of the ash water tank 2 through the ash water pump inlet pipe 31, and the outlet end of the ash water pump 14 is connected to the inlet end of the deaerator 10 through the ash water pump outlet pipe 32.

[0045] The bottom of the sedimentation tank 1 in this embodiment is funnel-shaped, and a sewage outlet 65 is opened at the bottom of the funnel-shaped sedimentation tank 1. A sedimentation tank ash rake 56 is installed in the sedimentation tank 1. The sewage outlet 65 is located below the sedimentation tank ash rake 56 and a substrate pump 18 is installed on the pipeline connecting the sewage outlet 65 to the filter press 11. The inlet end of the substrate pump 18 is connected to the sedimentation tank 1 through the substrate pump inlet pipe 35, and the outlet end of the substrate pump 18 is connected to the filter press 11 through the substrate pump outlet pipe 58.

[0046] In this embodiment, a sewage pipe 62 is installed at the bottom of the gray water tank 2, and the sewage pipe 62 is arranged opposite to the gray water pump inlet pipe 31.

[0047] The inlet end of the electric reaction cell 3 in this embodiment is connected to the reaction cell water inlet pipe 25 and the industrial air delivery pipe 36, and the outlet end of the electric reaction cell 3 is connected to the alkali reaction cell 4;

[0048] A regulating valve II 54 is installed on the reaction tank water inlet pipe 25 , and a flow meter 55 is installed on the regulating valve II 54 .

[0049] In this embodiment, the inlet end of the alkali reaction tank 4 is connected to the industrial air delivery pipe 36 and the alkali unloading pump 19, and the outlet end of the alkali reaction tank 4 is connected to the carbon dioxide reaction tank 5; a pH meter I 49 is installed in the alkali reaction tank 4;

[0050] Among them, the inlet end of the alkali unloading pump 19 is connected to the alkali unloading pump inlet pipe 42, the outlet end of the alkali unloading pump 19 is connected to one end of the alkali unloading pump outlet pipe 43, the other end of the alkali unloading pump outlet pipe 43 is connected to the alkali tank 12, the outlet end of the alkali tank 12 is connected to one end of the alkali adding metering pump inlet pipe 40, the other end of the alkali adding metering pump inlet pipe 40 is connected to the alkali adding metering pump 20, and the outlet end of the alkali adding metering pump 20 is connected to the alkali adding reaction tank 4 through the alkali adding metering pump outlet pipe 41; a Y-type filter I 46 is installed on the alkali adding metering pump inlet pipe 40.

[0051] The inlet end of the carbon dioxide reaction tank 5 in this embodiment is connected to the carbon dioxide inlet pipe 37, on which the pressure gauge I 52, the regulating valve I 51 and the pressure gauge II 53 are installed in sequence; a reaction tank agitator 6 is installed in the carbon dioxide reaction tank 5; and the outlet end of the carbon dioxide reaction tank 5 is connected to the inlet end of the sedimentation tank 7.

[0052] The inlet end of the water production pool 8 in this embodiment is connected to the industrial air delivery pipe 36 and the acid discharge pump 21, and the outlet end of the water production pool 8 is connected to the deaerator 10 through the water production pool outlet pipe 27; a pH meter II 50 is installed in the water production pool 8;

[0053] Among them, the inlet end of the acid unloading pump 21 is connected to the acid unloading pump inlet pipe 42, the outlet end of the acid unloading pump 21 is connected to the acid tank 13 through the acid unloading pump outlet pipe 43, the outlet end of the acid tank 13 is connected to the acid adding metering pump 22 through the acid adding metering pump inlet pipe 44, and the outlet end of the acid adding metering pump 22 is connected to the water production pool 8 through the acid adding metering pump outlet pipe 45; a Y-type filter II 47 is installed on the acid adding metering pump inlet pipe 44.

[0054] In this embodiment, the electric reaction cell 3, the alkali reaction cell 4, the carbon dioxide reaction cell 5 and the sedimentation tank 7 are all equipped with a funnel-shaped slag discharge hopper 57 at the lower end. A slag discharge pipe 29 is installed on one side of the bottom of the slag discharge hopper 57. A program-controlled valve 48 is installed on the slag discharge pipe 29.

[0055] Among them, a sludge pool 9 is connected to the bottom of the sludge discharge hopper 57, one end of the sludge discharge pipe 29 is connected to the sludge discharge hopper 57, and the other end of the sludge discharge pipe 29 is connected to the inlet end of the sludge pool 9. The outlet end of the sludge pool 9 is connected to the filter press 11 through the sludge conveying pipe 30, and a sludge conveying pump 16 is installed on the sludge conveying pipe 30.

[0056] The inlet end of the filter press 11 in this embodiment is connected to the sludge conveying pipe 30 and the substrate pump outlet pipe 58 , and the outlet end of the filter press 11 is installed with a filter cake output pipe 64 .

[0057] The inlet end of the deaerator 10 in this embodiment is also connected to a water supply pipe 63, and the outlet end of the deaerator 10 is installed with a deaerator water pump 17. The inlet end of the deaerator water pump 17 is connected to the deaerator 10 through a deaerator water pump inlet pipe 33, and the outlet end of the deaerator water pump 17 is installed with a deaerator water pump outlet pipe 34.

[0058] The working process of this embodiment is as follows:

[0059] (1) The black water with high solid content coming out of the gasification flash evaporation system enters the static mixer through the black water inlet pipe 23, and the flocculant enters the static mixer through the flocculant feed pipe 61; in the static mixer 59, the black water and the flocculant are fully mixed and then enter the sedimentation tank through the sedimentation tank inlet pipe 60; adding flocculant to the black water can effectively accelerate the sedimentation and separation speed of the solids in the black water; the black water after adding flocculant enters the sedimentation tank 1 through the sedimentation tank inlet pipe 60, and the solid particles in the black water in the sedimentation tank 1 are settled and separated under the action of gravity, and the gray water overflows from the upper part of the sedimentation tank 1 and overflows from the sedimentation tank 1 through the gray water outlet pipe 24 by gravity. The quality of this part of gray water is: total hardness (calculated as CaCO3) is about 1200 mg / L, suspended solids are about 100 mg / L, turbidity is about 100 NTU, and water volume is 544m 3 / h. The overflowing ash water is divided into two paths: one path enters the ash water tank 2 through the ash water tank inlet pipe 26, with a water volume of 344m 3 / h; the other way enters each reaction tank in turn through the reaction tank inlet pipe 25 to remove hardness and reduce turbidity, with a water volume of 200m 3 / h; the solids and black water settled in the sedimentation tank 1 are slowly moved by the sedimentation tank rake 56 and transported to the outlet at the bottom of the sedimentation tank, and enter the substrate pump 18 through the substrate pump inlet pipe 35 to increase the pressure.

[0060] (2) The solids and black water settled in the sedimentation tank 1 enter the substrate pump 18 through the substrate pump inlet pipe 35 to increase the pressure, and after the pressure is increased, it is transported to the filter press 11 through the substrate pump outlet end 58.

[0061] (3)344m 3 / h of gray water flows into the gray water tank 2 through the gray water tank inlet pipe 26 for storage, enters the gray water pump 14 through the gray water pump inlet pipe 31 for pressure increase, and is then transported to the deaerator 10 for recycling through the gray water pump outlet pipe 32; at the same time, to ensure the stable operation of the entire system, if the water quality of the recycled gray water is abnormal, the gray water can be discharged into the sewage treatment system through the sewage pipe 62.

[0062] (4) 200m 3 / h of gray water first enters the electric reaction tank 3 through the reaction tank inlet pipe 25. After the electric reaction tank is full of water, the electric reactor is energized. Under the action of the electric field, impurities such as colloidal particles, suspended matter, and insoluble organic matter (COD) in the water form larger flocs and precipitate from the water; at the same time, industrial air enters the electric reaction tank 3 through the industrial air delivery pipe 36, stirs the gray water to ensure sufficient reaction, and at the same time controls the growth rate of the flocs so that the flocs settle while growing.

[0063] (5) After the electrical reaction, the gray water flows by gravity into the alkali addition reaction tank 4, and the liquid alkali enters the alkali addition reaction tank 4 through the alkali addition metering pump outlet pipe 41. The value of the pH meter I 49 can be used to control the amount of alkali liquid added to adjust the pH value of the gray water. At the same time, the Ca2+ and Mg2+ in the gray water react with the alkalinity to form solid particles, which precipitate from the gray water. At the same time, industrial air enters the alkali addition reaction tank 4 through the industrial air delivery pipe 36 to stir the gray water to ensure sufficient reaction.

[0064] (6) After the alkali reaction, the grey water flows by gravity into the carbon dioxide reaction tank 5, and the carbon dioxide gas enters the carbon dioxide reaction tank 5 through the carbon dioxide inlet pipe 37. When the carbon dioxide reaction tank 5 is full, the regulating valve I 51 is opened and carbon dioxide is slowly introduced. The carbon dioxide gas pressure is controlled at 0.12 MPa. The carbon dioxide gas can increase the carbonate content in the water, and Ca2+ and Mg2+ can react with the carbonate to form insoluble substances, thereby better removing the calcium hardness in the grey water.

[0065] (7) When flocs or sediments are clearly present in the reaction tank, the agitator 6 is turned on and the grey water enters the sedimentation tank 7. The sludge in the lower part of the sedimentation tank 7 is precipitated and the clear liquid in the upper part overflows into the water production tank 8.

[0066] (8) After the hardness and turbidity reduction, the total hardness of the clean water (calculated as CaCO3) is ≤200 mg / L, the suspended solids are ≤50 mg / L, and the turbidity is ≤50 NTU. The clean water enters the water production booster pump 15 through the water production pool outlet pipe 27 to be pressurized and sent out. At the same time, a pH meter II 50 is set in the water production pool. According to the value of the pH meter, concentrated sulfuric acid can be added to the water production pool 8 through the acid metering pump outlet pipe 45 to adjust the pH value of the water. The industrial air enters the water production pool 8 through the industrial air delivery pipe 36. The stirring of the industrial air ensures the uniformity of the pH value of the water production pool.

[0067] (9) The sludge with high solid content in the reaction tank and sedimentation tank is discharged into the slag discharge hopper 57. The sludge discharge time is set according to the solid content of the sludge. The program-controlled valve 48 is started at a fixed time, and the sludge in the slag discharge hopper 57 is discharged into the sludge pool 9 through the sludge discharge pipe 29.

[0068] (10) A sludge tank 9 is installed directly below the sludge discharge hopper 57. The sludge is settled and stored in the sludge tank 9, and then the sludge is pressurized by the sludge transfer pump 16 and then transferred to the filter press 11 through the sludge transfer pipe 30; the inlet end of the filter press 11 is connected to the sludge transfer pipe 30 and the substrate pump outlet pipe 58, and the solids and water at the bottom of the sedimentation tank enter the filter press 11 through the substrate pump outlet pipe 58. The sludge generated during the hardness and turbidity removal process is transferred to the filter press through the sludge transfer pipe 30. The solids in the filter press 11 are filtered to form a fine residue filter cake, which is then transported out of the boundary area by truck for sale.

[0069] (11)344m 3 / h of circulating grey water and 200m3 of grey water after de-hardening and turbidity reduction 3 / h of produced water enters the deaerator 10 through the ash water pump outlet pipe 32 and the produced water lifting pump outlet pipe 28 for mixing. The total hardness (calculated as CaCO3) after mixing is ≤600mg / L. After deoxygenation, it enters the deaerator water pump 17 through the deaerator water pump inlet pipe 33 to increase the pressure. After the pressure is increased, it is sent to the gasification quenching chamber, washing tower and other systems for recycling through the deaerator water pump outlet pipe 34. At the same time, if the ash water indicators are abnormal, the circulating ash water is discharged through the sewage pipe 62. When the water volume of the deaerator 10 is insufficient, desalted water can be added to the deaerator 10 through the water supply pipe 63 to ensure the stable operation of the system.

[0070] Among them, the ash water is collected except for the liquid alkali required for reducing turbidity and adjusting the pH value, and then enters the alkali unloading pump 19 through the alkali unloading pump inlet pipe 38. The alkali unloading pump 19 is turned on and transported to the alkali tank 12 for storage through the alkali unloading pump outlet pipe 39; the liquid alkali is transported to the alkali tank 12 for storage through the alkali unloading pump outlet pipe 39, and then enters the alkali adding metering pump 20 through the alkali adding metering pump inlet pipe 40 to realize the precise control of the amount of liquid alkali added; according to the generation of solid particles in the alkali adding reaction tank and the pH value of the ash water, the alkali adding metering pump 20 is used to realize the transportation, metering and adjustment of the liquid alkali.

[0071] In order to ensure the stability of the pH value of the water produced in the water production pool, an acid metering pump is set up, and the concentrated sulfuric acid required for adjusting the pH value is purchased externally, and then enters the acid unloading pump 21 through the acid unloading pump inlet pipe 42. The acid unloading pump 21 is turned on and transported to the acid tank 13 for storage through the acid unloading pump outlet pipe 43; the concentrated sulfuric acid is transported to the acid tank 13 for storage through the acid unloading pump outlet pipe 43, and then enters the acid metering pump 22 through the acid metering pump inlet pipe 44 to achieve precise control of the amount of concentrated sulfuric acid added; according to the value of the pH meter II50 in the water production pool, the acid metering pump 22 is appropriately turned on to add concentrated sulfuric acid to adjust the pH value of the produced water, thereby realizing the transportation, metering and adjustment of concentrated sulfuric acid.

[0072] Monitor the changes in the carbon dioxide inlet pressure at any time, and use the regulating valve I 51 to control the carbon dioxide gas pressure entering the carbon dioxide reaction tank 5 at 0.12 MPa to ensure the stable operation of the reaction tank; and filter out impurities in the liquid alkali and concentrated sulfuric acid through the Y-type filter to avoid damage to the alkali metering pump 20 and the acid metering pump 22.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gasification ash water recovery system, characterized in that: It includes a static mixer, a settling tank, an ash water tank, an electric reaction tank, an alkali reaction tank, a carbon dioxide reaction tank, a sedimentation tank, a water production tank, a deaerator and a filter press. The inlet end of the static mixer is connected to the black water inlet pipe and the flocculant feed pipe respectively. The outlet end of the static mixer is connected to the settling tank through the settling tank inlet pipe. The outlet end of the settling tank bottom is connected to the filter press. A ash water outlet pipe is provided at the upper middle part of the settling tank. The ash water outlet pipe is divided into two routes: one route is connected to the ash water tank through the ash water tank inlet pipe; the other route enters the electric reaction tank, the alkali reaction tank, the carbon dioxide reaction tank, the sedimentation tank and the water production tank in sequence through the reaction tank inlet pipe. A water production lift pump is provided on the pipeline connecting the water production tank and the deaerator. The inlet end of the water production lift pump is connected to the water production tank through the water production tank outlet pipe, and the outlet end of the water production lift pump is connected to the deaerator through the water production lift pump outlet pipe. An ash water pump is provided on the pipeline connecting the ash water tank and the deaerator. The inlet end of the ash water pump is connected to the outlet end of the ash water tank through the ash water pump inlet pipe, and the outlet end of the ash water pump is connected to the inlet end of the deaerator through the ash water pump outlet pipe.

2. The gasification ash water recovery system according to claim 1, characterized in that: The bottom of the sedimentation tank is funnel-shaped, and a sewage outlet is provided at the bottom of the funnel-shaped sedimentation tank. A sedimentation tank ash rake is provided in the sedimentation tank. The sewage outlet is located below the sedimentation tank ash rake and a substrate pump is provided on the pipeline connecting the sewage outlet and the filter press. The inlet end of the substrate pump is connected to the sedimentation tank through the substrate pump inlet pipe, and the outlet end of the substrate pump is connected to the filter press through the substrate pump outlet pipe.

3. The gasification ash water recovery system according to claim 1 or 2, characterized in that: A sewage pipe is provided at the bottom of the ash water tank, and the sewage pipe is arranged opposite to the water inlet pipe of the ash water pump.

4. The gasification ash water recovery system according to claim 3, characterized in that: The inlet end of the electric reaction cell is connected to the reaction cell water inlet pipe and the industrial air delivery pipe respectively, and the outlet end of the electric reaction cell is connected to the alkali addition reaction cell; Among them, a regulating valve II is provided on the water inlet pipe of the reaction tank, and a flow meter is provided on the regulating valve II.

5. The gasification ash water recovery system according to claim 4, characterized in that: The inlet end of the alkali addition reaction tank is provided with an industrial air delivery pipe and an alkali unloading pump, and the outlet end of the alkali addition reaction tank is connected to the carbon dioxide reaction tank; a pH meter I is provided in the alkali addition reaction tank; Wherein, the inlet end of the alkali unloading pump is connected with the inlet pipe of the alkali unloading pump, the outlet end of the alkali unloading pump is connected with one end of the outlet pipe of the alkali unloading pump, the other end of the outlet pipe of the alkali unloading pump is provided with an alkali tank, the outlet end of the alkali tank is connected with one end of the inlet pipe of the alkali adding metering pump, the other end of the inlet pipe of the alkali adding metering pump is provided with an alkali adding metering pump, and the outlet end of the alkali adding metering pump is connected with the alkali adding reaction tank through the outlet pipe of the alkali adding metering pump; A Y-type filter I is provided on the inlet pipe of the alkali adding metering pump.

6. The gasification ash water recovery system according to claim 5, characterized in that: The inlet end of the carbon dioxide reaction pool is connected to a carbon dioxide inlet pipe, on which a pressure gauge I, a regulating valve I and a pressure gauge II are sequentially arranged; a reaction pool agitator is arranged in the carbon dioxide reaction pool; and the outlet end of the carbon dioxide reaction pool is connected to the inlet end of the sedimentation tank.

7. The gasification ash water recovery system according to claim 6, characterized in that: The inlet end of the water production pool is connected to the industrial air delivery pipe and the acid discharge pump, and the outlet end of the water production pool is connected to the deaerator through the water production pool outlet pipe; a pH meter II is provided in the water production pool; The inlet end of the acid unloading pump is provided with an acid unloading pump inlet pipe, the outlet end of the acid unloading pump is connected to the acid tank through the acid unloading pump outlet pipe, the outlet end of the acid tank is connected to the acid adding metering pump through the acid adding metering pump inlet pipe, and the outlet end of the acid adding metering pump is connected to the water production pool through the acid adding metering pump outlet pipe; A Y-type filter II is provided on the inlet pipe of the acid addition metering pump.

8. The gasification ash water recovery system according to claim 7, characterized in that: The lower ends of the electric reaction cell, alkali reaction cell, carbon dioxide reaction cell and sedimentation tank are all provided with a funnel-shaped slag discharge hopper, a slag discharge pipe is provided at one side of the bottom of the slag discharge hopper, and a program-controlled valve is provided on the slag discharge pipe; Among them, a sludge pool is set below the slag discharge hopper, one end of the slag discharge pipe is connected to the slag discharge hopper, and the other end of the sludge discharge pipe is connected to the inlet end of the sludge pool. The outlet end of the sludge pool is connected to the filter press through a sludge conveying pipe, and a sludge conveying pump is set on the sludge conveying pipe.

9. The gasification ash water recovery system according to claim 8, characterized in that: The inlet end of the filter press is connected with the sludge conveying pipe and the substrate pump outlet pipe, and the outlet end of the filter press is provided with a filter cake output pipe.

10. The gasification ash water recovery system according to claim 9, characterized in that: The inlet of the deaerator is also provided with a water supply pipe, the outlet of the deaerator is provided with a deaerator water pump, the inlet of the deaerator water pump is connected to the deaerator through a deaerator water pump inlet pipe, and the outlet of the deaerator water pump is provided with a deaerator water pump outlet pipe.

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