CN214422450U

CN214422450U - Membrane method coal gasification technology waste water treatment and resourceful device

Info

Publication number: CN214422450U
Application number: CN202120061970.8U
Authority: CN
Inventors: 姬克瑶; 姬保江
Original assignee: Dalian Dowellone Membrane Technology Co ltd
Current assignee: Dalian Dowellone Membrane Technology Co ltd
Priority date: 2021-01-11
Filing date: 2021-01-11
Publication date: 2021-10-19
Anticipated expiration: 2031-01-11

Abstract

The utility model discloses a membrane method coal gasification process wastewater treatment and resource device, including the flash tank that links to each other with coal gasifier outlet conduit, the flash tank links to each other with the buffering settling cask, the clear liquid mouth of buffering settling cask is connected to membrane device through the pump, the clear liquid mouth of membrane device is connected to the softening tank, the softening tank links to each other with evaporation hot water tower or coal gasifier buck system, one of them dense mouth of membrane device links back to the buffering settling cask, and another dense mouth of a river links to each other with the dross removal mechanism, the delivery port of dross removal mechanism links back to the buffering settling cask; the softening tank is also connected with an analysis device, a waste liquid port of the analysis device is connected with the reactor, and a saline port of the reactor is connected back to the analysis device. The device cancels the use of chemicals in the operation process, reduces the operation cost, realizes water saving and emission reduction, is beneficial to the long-period stable operation of the coal gasification furnace, has less waste liquid amount and small occupied area, and effectively solves the problem of the scaling of the process water of the coal gasification system.

Description

Membrane method coal gasification technology waste water treatment and resourceful device

Technical Field

The utility model belongs to the technical field of water treatment, concretely relates to membrane method coal gasification technology waste water treatment and resourceful device.

Background

The coal chemical industry is a key development industry in China, the core device of the coal chemical industry is a coal gasifier, a coal gasification process water system is a main facility for ensuring the safe and stable production of the coal gasifier, and the coal gasifier generates a large amount of process water in the production process and has the characteristics of high temperature, high pressure, high turbidity, high suspended matter, high solid content and the like; the process water containing high hardness, high alkalinity, high ammonia nitrogen and high COD is treated by adopting the processes of multi-stage flash evaporation, medicament, gravity settling and the like, and a high-temperature flocculating agent, a coagulant aid, a dispersing agent, a scale inhibitor and the like are required to be added, so that the problems of high medicament consumption, unstable effluent quality, large wastewater discharge amount, high treatment difficulty and the like exist, the problem is the objective production problem of the industry, the coal chemical industry is always troubled for years, the long-period stable operation of the coal gasifier is also restricted, and the economical efficiency of the coal gasifier is further influenced.

In the traditional coal chemical industry, the treatment of the process water of the coal gasifier is carried out by adding a medicament (flocculant), then settling and finally adopting a deslagging device; the method has the following problems after treatment: (1) high suspended matter in water: the concentration of suspended matters in the treated water is high, the water quality is poor, secondary cyclic utilization causes certain damage to system equipment, such as blockage of a spray head, uneven water outlet, failure in achieving the purification effect of the process and the like. (2) High hardness in water: the water hardness reaches more than 1600-2000 mg/l, not only can the formation of calcium carbonate and magnesium scale be induced, but also a part of scaling substances can be softened and gathered together to be adhered to the pipe wall, and the solid suspension is also easy to deposit in the pipeline and equipment, so that the equipment pipeline is more seriously scaled. (3) For the reasons, in order to ensure the stability of the system, a large amount of fresh water can only be continuously injected to increase the amount of discharged water, and the load of the sewage treatment system is increased. (4) The sludge dewatering equipment has large load, and because the water quantity is large, a large amount of flocculating agent and dispersing agent are added into the water, so that the processing capacity of the filter pressing equipment is limited. (5) High-speed washing and large air resistance, thus reducing the service life of the equipment and the strength.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a membrane method coal gasification process wastewater treatment and recycling device, which cancels the use of a medicament in the operation process, reduces the operation cost, realizes water conservation and emission reduction, is beneficial to the long-period stable operation of a coal gasification furnace, has less waste liquid amount and small occupied area, and effectively solves the problem of scaling of process water of a coal gasification system.

In order to achieve the purpose, the technical scheme of the application is as follows: a membrane method coal gasification process wastewater treatment and resource device comprises a flash tank connected with a coal gasifier water outlet pipeline, wherein the flash tank is connected with a buffer settling tank, a clear liquid port of the buffer settling tank is connected to a membrane device through a pump, a clear liquid port of the membrane device is connected to a softening tank, the softening tank is connected with an evaporation hot water tower or a coal gasifier grey water system, one concentrated water port of the membrane device is connected back to the buffer settling tank, the other concentrated water port of the membrane device is connected with a deslagging device, and a water outlet of the deslagging device is connected back to the buffer settling tank; the softening tank is also connected with an analysis device, a waste liquid port of the analysis device is connected with the reactor, and a saline port of the reactor is connected back to the analysis device.

Further, inside from last to being equipped with filter sieve an, filter sieve b and water cap down in proper order of buffering settling cask, be connected with turbid water pipeline in buffering settling cask upper portion one side, the opposite side bottom is connected with the water intake pipe, be equipped with turbid water control valve on the turbid water pipeline, be equipped with into water control valve on the water intake pipe.

Furthermore, the bottom of the buffering sedimentation tank is of an inclined structure and is provided with a plurality of vibrating rappers, a discharge screw conveyor is arranged at the lower end of the inclined structure and is connected with a vacuum filter press, and one side of the vacuum filter press is connected back to a water inlet pipeline through a pump.

Furthermore, the analysis device comprises an analysis liquid pool, a filter and an analysis pump, and the analysis liquid in the analysis liquid pool is lifted to the filter by the analysis pump and then is sent to the softening tank.

Furthermore, the precision of the filter sieve a is 20-50 μm, and the precision of the filter sieve b is 100-200 μm.

Furthermore, the membrane device adopts a nanoscale inorganic membrane with the precision of 200-500 nm.

Furthermore, the water outlet index of the softening tank is 0-50 mg/L.

Furthermore, the reactor comprises a reactor body, and the reactor body is connected with a dosing pump, a clear liquid pump and a sludge pump.

As a further step, the evaporation hot water tower or the coal gasifier grey water system is connected with a coal gasifier water outlet pipeline.

As a further step, a pretreatment device is arranged in front of the membrane device, and the pretreatment device is a multi-media filter, a sand filter, a centrifuge, a ceramic ultrafiltration membrane, a ceramic nanofiltration membrane or a tubular ultrafiltration membrane.

The utility model discloses owing to adopt above technical scheme, can gain following technological effect: 1. the device is mainly used for treating process water after multistage flash evaporation, raw water is taken from a final-stage flash evaporator, turbidity, colloid, suspended matters, solid content and the like in the water are removed after the raw water enters a membrane device, the raw water enters a high-temperature membrane softening tank, hardness, alkalinity, ammonia nitrogen, COD and the like in the water are removed, and produced water is directly recycled in a coal gasification production system or an evaporation hot water tower. The device separates colloid, suspended matters and solid content, does not add medicament, reduces the operation cost and has stable effluent quality.

2. The softening tank is adopted, so that the hardness in water can be effectively removed, the flow is short, the waste liquid amount is small, the occupied area is small, and the problem of process water scaling of a coal gasification system is effectively solved.

3. In the operation process, the use of a medicament is cancelled, the operation cost of the device is reduced, water saving and emission reduction are realized, the long-period stable operation of the gasification furnace is facilitated, and remarkable direct benefit, indirect economic benefit and environmental protection benefit are achieved.

Drawings

FIG. 1 is a schematic view of a membrane coal gasification wastewater treatment and recycling apparatus;

FIG. 2 is a schematic structural view of a buffer settling tank;

FIG. 3 is a schematic view of a membrane apparatus;

the sequence numbers in the figures illustrate: 1. a coal gasifier water outlet pipeline; 2. a flash tank; 3. a buffer settling tank; 4. a membrane device; 5. a deslagging device; 6. a resolving device; 7. a softening tank; 8. an evaporation hot water tower or a coal gasifier grey water system; 9. a reactor; 10. a filter screen a; 11. a filter sieve b; 12. a water cap; 13. a vibration knocker; 14. a water inlet control valve; 15. a turbid water control valve; 16. a discharge screw conveyor 17 and a vacuum filter press.

Detailed Description

The invention will be described in further detail with reference to the following figures and specific embodiments: the present application is further described by taking this as an example.

Example 1

The embodiment provides a membrane method coal gasification technology waste water treatment and resource device, including flash tank, buffering settling tank, membrane device, softening tank, analytical equipment, reactor. The buffer settling tank comprises a settling tank body, a centrifugal pump and a matched pipeline instrument valve; the membrane device comprises a nano inorganic membrane group, a centrifugal pump and a matched pipeline instrument valve; the softening tank comprises a softener and a matched pipeline instrument valve; the analysis device comprises an analysis liquid pool, an analysis pump, an analysis filter and a matched pipeline instrument valve; the reactor comprises a reactor body, a clear liquid pump, a dosing pump, a sludge pump and a matched pipeline instrument valve.

The device adopts the processes of flash evaporation, module softening, analysis and recovery to treat the coal gasification process water, the process water firstly enters a buffer settling tank after three-stage flash evaporation treatment and is subjected to primary settling, supernatant in the buffer settling tank is conveyed to a membrane device through a pump, waste residues are discharged outside the tank bottom, supernatant entering the membrane device is treated and then enters a next-stage softening tank, water produced at one concentrated water end of the membrane device flows back to the buffer settling tank, meanwhile, the other concentrated water end is connected with a deslagging device to realize indirect deslagging, and water produced by the deslagging device also flows back to the buffer settling tank; the softening tank treats the high-salt and high-hardness water and then recycles the treated water to an evaporation hot water tower or a coal gasifier grey water system, and recycled circulating water is recycled to the inlet flash tank after passing through the device flow and is recycled. The filler is analyzed at the working interval of the softening tank, the generated analysis waste liquid enters the reactor, the saline water after the treatment of the reactor can be used for analyzing the filler again, the analysis capability of the filler recovers the softening capability, the softening tank stably operates, and the enriched substance generated in the reactor can be recycled, so that the dual benefits of energy conservation, emission reduction and environmental protection are achieved.

In this application process water directly gets into membrane device after tertiary flash distillation, buffering settling cask are handled, not add the medicament, no flocculating agent, no coagulant aid, no scale inhibitor, no dispersant, need not carry out the PH and adjust, need not cool down and handle. After the buffer settling tank performs primary settling action on incoming water, supernatant liquor can overflow or be conveyed to a membrane device through a pump, the lower portion of the buffer settling tank is discharged and spirally pressed to be filtered, filter pressing produced water returns to an inlet, and waste residues are discharged; a water cap layer is arranged in the buffer settling tank, and process water is intercepted by the water cap to the waste residues, so that the effect of preliminary pre-filtering of the process water is achieved; two layers of filter sieves are arranged above the water cap layer, the precision of the lower layer is 100-200 mu m, and the precision of the upper layer is 20-50 mu m. The membrane device mainly removes solids, suspended matters, colloids and the like, comprises a membrane component and a matched pipeline instrument valve, can be combined in parallel or in series to meet the process requirements, can realize continuous work of the device, does not add medicaments or increase ion components in operation, and ensures that the turbidity of pretreated effluent is not more than 5 NTU. The softening tank mainly removes the hardness in water, the filler can directionally soften the hardness in the grey water at the temperature of 30-120 ℃, and the softening tank can endure the severe conditions of high COD, high turbidity, high NH3-N and the like; the water outlet index of the softening tank is generally 0-50 mg/L. The analytic device can carry out the analysis to the filler, makes the analytic ability of filler resume the softening ability, guarantees the softening tank steady operation. The analysis liquid is lifted to a filter by an analysis pump and then is sent to a softening tank after being filtered. The waste liquid generated by the reactor is high-salt high-hardness waste water and can be added with CO produced in a factory₂And industrial alkali, clear liquid can be recycled, and high-concentration slurry can be discharged or sent to a slag-water plate-and-frame filter press; or discharged into a discharge system for treatment. And (3) feeding the regenerated desorption waste liquid into a reactor, simultaneously starting a dosing pump and a sludge pump, carrying out filter pressing and discharging on the sludge after the desorption liquid is treated, and sending the supernatant liquid into a desorption liquid pool again through a clear liquid pump for recycling. The membrane device is preferably a nano-scale inorganic membrane with the precision of 200-500nm, and the tube type can be selectedThe membrane, the silicon carbide membrane, the silicon nitride membrane and the like, and any medicament is not needed, so that the pollution and blockage phenomena of the membrane component are avoided.

The membrane device can be preposed with a pretreatment device which is a multi-medium filter, a sand filter, a centrifuge, a ceramic ultrafiltration membrane, a ceramic nanofiltration membrane or a tubular ultrafiltration membrane; the residue removing device is a filter and membrane concentration, and the filter can be belt filter press, automatic cleaning filter, box filter press, vacuum filter, disc filter, etc.;

the analysis device can adopt reverse osmosis + electrodialysis, reverse osmosis + evaporation, nanofiltration + reverse osmosis, ultrafiltration + high-pressure reverse osmosis or nanofiltration + high-pressure reverse osmosis, the analysis device generates analysis waste liquid, and the filler recovers the softening capacity.

The device treats the coal gasification process water, can recycle the coal gasification process water, saves a large amount of water resources, and effectively reduces the using amount of the scale inhibition and dispersion agent; meanwhile, the system effectively reduces the scaling problem of the system, has stable system operation and obvious direct benefit and indirect economic benefit.

The above, only for the utility model discloses create the concrete implementation way of preferred, nevertheless the utility model discloses the protection scope of creation is not limited to this, and any person skilled in this technical field is in the utility model discloses create the technical scope of disclosure, according to the utility model discloses the technical scheme of creation and utility model design equivalence replacement or change all should be covered in the protection scope of creation of the utility model.

Claims

1. A membrane method coal gasification process wastewater treatment and resource device is characterized by comprising a flash tank connected with a coal gasifier water outlet pipeline, wherein the flash tank is connected with a buffer settling tank, a clear liquid port of the buffer settling tank is connected to a membrane device through a pump, a clear liquid port of the membrane device is connected to a softening tank, the softening tank is connected with an evaporation hot water tower or a coal gasifier grey water system, one concentrated water port of the membrane device is connected back to the buffer settling tank, the other concentrated water port of the membrane device is connected with a slag removal device, and a water outlet of the slag removal device is connected back to the buffer settling tank; the softening tank is also connected with an analysis device, a waste liquid port of the analysis device is connected with the reactor, and a saline port of the reactor is connected back to the analysis device.

2. The device for treating and recycling wastewater generated in the coal gasification process according to claim 1, wherein the inside of the buffer settling tank is sequentially provided with a filter sieve a, a filter sieve b and a water cap from top to bottom, one side of the upper part of the buffer settling tank is connected with a turbid water pipeline, the bottom of the other side of the upper part of the buffer settling tank is connected with a water inlet pipeline, the turbid water pipeline is provided with a turbid water control valve, and the water inlet pipeline is provided with a water inlet control valve.

3. The membrane coal gasification process wastewater treatment and recycling device according to claim 2, wherein the bottom of the buffer settling tank is of an inclined structure and is provided with a plurality of shaking rappers, a discharge screw conveyor is arranged at the lower end of the inclined structure and is connected with a vacuum filter press, and one side of the vacuum filter press is connected back to a water inlet pipeline through a pump.

4. The device for treating and recycling wastewater generated in the coal gasification process according to claim 1, wherein the desorption device comprises a desorption liquid pool, a filter and a desorption pump, and the desorption liquid in the desorption liquid pool is lifted to the filter by the desorption pump and then is sent to the softening tank.

5. The device for treating and recycling wastewater generated in the coal gasification process by using the membrane method as claimed in claim 2, wherein the precision of the filter sieve a is 20-50 μm, and the precision of the filter sieve b is 100-200 μm.

6. The device for treating and recycling wastewater generated in the coal gasification process by the membrane method as claimed in claim 1, wherein the membrane device adopts a nano-scale inorganic membrane with the precision of 200-500 nm.

7. The device for treating and recycling wastewater of a membrane coal gasification process according to claim 1, wherein the effluent index of the softening tank is 0-50 mg/L.

8. The membrane coal gasification process wastewater treatment and reclamation device as recited in claim 1, wherein the reactor comprises a reactor body, and the reactor body is connected with a dosing pump, a clear liquid pump and a sludge pump.

9. The membrane coal gasification wastewater treatment and reclamation device as recited in claim 1, wherein the evaporation hot water tower or the coal gasifier grey water system is connected with a coal gasifier water outlet pipeline.

10. The device for treating and recycling wastewater generated in the coal gasification process according to claim 1, wherein a pretreatment device is arranged in front of the membrane device, and the pretreatment device is a multi-media filter, a sand filter, a centrifuge, a ceramic ultrafiltration membrane, a ceramic nanofiltration membrane or a tubular ultrafiltration membrane.