Device for preparing synthesis gas by comprehensive utilization of amide waste liquid

Abstract

The utility model discloses a device of amide waste liquid comprehensive utilization preparation synthesis gas, including waste water source, pulping device, tail gas recovery unit, gasification reaction device etc, wherein, waste water source is linked with coal mill device entrance intercommunication, and waste water source and coal mill export are linked with tail gas recovery unit entrance, and the coal slurry of preparation is linked with gasification reaction device entrance, and synthesis gas purification recovery system is linked with the outlet intercommunication of gasification device, and waste water coal slurry and oxygen burn reaction in gasification device, and generate synthesis gas, and synthesis gas is recovered after purification. Gasification furnace and high concentration amide waste water coal slurry are combined into one, and synthesis gas is produced while effectively treating high concentration amide waste water, and the influence of waste water on surrounding environment is reduced. Organic matter in waste water is gasified and reacts to generate synthesis gas in high temperature and high pressure environment, and energy consumption is saved.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical technology, and in particular to a device for the comprehensive utilization of amide waste liquid to produce syngas. Background Technology

[0002] Amide wastewater generated during petrochemical production contains large amounts of organic matter such as benzene and cyclohexanone, as well as chemical substances such as nitrogen and sulfur. If discharged indiscriminately without treatment, it will cause environmental pollution and endanger personal safety. If conventional wastewater treatment methods such as concentration, crystallization, separation, and incineration are used, not only is the investment large, but the treatment process is also very costly. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a device for the comprehensive utilization of amide waste liquid to produce syngas, thereby solving the existing technical problem that amide waste liquid is not easy to treat.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] An apparatus for the comprehensive utilization of amide waste liquid to produce syngas includes a coal bunker, the bottom of which is connected to a weighing coal feeder. The weighing coal feeder is a screw conveyor or belt conveyor equipped with a weighing and metering device. The bottom outlet of the weighing coal feeder is connected to the feed inlet of a coal mill through a pipeline. The coal mill is also connected to a water tank, an amide waste liquid storage tank, and an additive tank through pipelines.

[0006] A waste liquid feed pump, flow meter, and flow regulating valve are installed between the aforementioned coal mill and the amide waste liquid storage tank;

[0007] An additive feed pump, an additive flow meter, and an additive flow regulating valve are installed between the coal mill and the additive tank.

[0008] A coal milling water pump, a coal milling water flow meter, and a coal milling water flow regulating valve are installed between the coal mill and the water tank.

[0009] The sludge storage tank is equipped with a nitrogen sealing and tail gas adsorption treatment device, and a stirring device is installed inside the tank to prevent clogging.

[0010] The additive tank is equipped with an additive feed line and a water supply line, and is also equipped with a stirring device to adjust the additive concentration and dosage according to the formula.

[0011] The aforementioned coal mill is equipped with a ventilation pipe and a tail gas adsorption treatment device. The coal mill is also connected to a coal slurry storage tank through a pipeline, and the coal slurry is pumped to the post-gasification reaction unit for use. The coal slurry storage tank and the coal slurry pump are equipped with flushing pipelines and sewage discharge pipelines to prevent sedimentation and blockage.

[0012] The aforementioned gasification reaction device includes an injection device and a cooling device arranged sequentially from top to bottom; the injection device includes a coal slurry inlet, an oxygen inlet, and a cooling water inlet and outlet.

[0013] The aforementioned cooling device is a coil-type or jacketed cooling device.

[0014] The outlet of the aforementioned gasification reaction device is connected to a gas purification system, which is used to purify the syngas before it enters subsequent devices for product production.

[0015] This utility model provides a device for the comprehensive utilization of amide waste liquid to produce syngas. The device uses a coal mill to recycle amide waste liquid to produce a high-concentration coal-water slurry. The coal-water slurry is atomized by a jet burner, and the organic matter contained therein is gasified under the action of high-temperature incomplete combustion to generate syngas with carbon monoxide and hydrogen as the main components. The syngas is then recycled and used in chemical production.

[0016] The escapable gases in the wastewater are sealed with nitrogen at the wastewater tank and coal mill outlet, and then further recovered to the tail gas treatment device for treatment before being discharged; the sulfur and other elements contained in the wastewater are recovered by subsequent devices to produce sulfuric acid.

[0017] The organic compounds such as amides and benzene in the wastewater undergo gasification reactions at high temperatures to generate syngas, effectively utilizing their components and saving energy. Simultaneously producing syngas effectively treats the amide wastewater, solving a common problem in the domestic industry and reducing the wastewater's impact on the surrounding environment.

[0018] This utility model has the following beneficial effects:

[0019] 1. Coal-water slurry is used in gasifiers where the reaction temperature reaches over 1300℃. It can decompose the harmful organic matter and nitrogen, sulfur and other compounds in amide waste liquid into basic oxides, achieving the purpose of harmless treatment and producing syngas to generate economic benefits.

[0020] 2. By using gas purification, separation, and sulfur recovery devices, sulfides in waste liquid are recovered to produce sulfuric acid products, generating economic benefits. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] The components include: 1. Coal bunker; 2. Nitrogen gas; 3. Weighing coal feeder; 4. Ventilation pipe; 5. Amide waste liquid storage tank; 6. Additive pump; 7. Nitrogen gas seal; 8. Tail gas adsorption treatment device; 9. Additive tank; 10. Additive water supply pipeline; 11. Additive feed pipeline; 12. Water tank; 13. Coal mill water pump; 14. Coal mill water flow meter and flow regulating valve; 15. Additive flow meter and flow regulating valve; 16. Waste liquid flow meter and flow regulating valve; 17. Coal mill; 18. Coal mill ventilation pipeline; 19. Flushing water pipeline; 20. Coal slurry storage tank; 21. Coal slurry pump; 22. Injection device; 23. Gasification device; 24. Cooling device. Detailed Implementation

[0024] Example 1:

[0025] The apparatus for the comprehensive utilization of amide waste liquid to produce syngas includes a coal bunker 1. The bottom of the coal bunker 1 is connected to a weighing coal feeder 3. The weighing coal feeder 3 is a screw conveyor or belt conveyor equipped with a weighing and metering device. The bottom outlet of the weighing coal feeder 3 is connected to the inlet of a coal mill 17 through a pipeline. The coal mill 17 is also connected to a water tank 12, an amide waste liquid storage tank 4, and an additive tank 8 through pipelines respectively.

[0026] The aforementioned coal mill 17 and amide waste liquid storage tank 4 are equipped with a waste liquid feed pump 5, a flow meter and a flow regulating valve 16;

[0027] An additive feed pump 9, an additive flow meter, and an additive flow regulating valve 15 are installed between the coal mill 17 and the additive tank 8.

[0028] A coal milling water pump 13, a coal milling water flow meter, and a coal milling water flow regulating valve 14 are provided between the coal mill 17 and the water tank 12.

[0029] The amide waste liquid storage tank 4 is equipped with a nitrogen seal 6 and a tail gas adsorption treatment device 7, and a stirring device is installed in the storage tank to prevent blockage.

[0030] The additive tank 8 is equipped with an additive feed line 11 and a water supply line 10, and is also equipped with a stirring device to adjust the additive concentration and dosage according to the formula.

[0031] The coal mill 17 mentioned above is equipped with a ventilation pipe 18 and a tail gas adsorption treatment device 7. The coal mill 17 is also connected to the coal slurry storage tank 20 through a pipeline and is sent to the post-gasification reaction device 22 by the coal slurry pump 21. The coal slurry storage tank 20 and the coal slurry pump 21 are equipped with flushing pipelines 19 and sewage discharge pipelines to prevent sedimentation and blockage.

[0032] The gasification reaction device 22 mentioned above includes an injection device 23 and a cooling device 24 arranged sequentially from top to bottom; the injection device 23 includes a coal slurry inlet, an oxygen inlet, and a cooling water inlet and outlet.

[0033] The aforementioned cooling device 24 is a coil-type or jacketed cooling device.

[0034] The outlet of the aforementioned gasification reaction device 22 is connected to a gas purification system, which is used to purify the syngas before it enters subsequent devices for product production.

[0035] This utility model provides a device for the comprehensive utilization of amide waste liquid to produce syngas. The device uses a coal mill to recycle amide waste liquid to produce a high-concentration coal-water slurry. The coal-water slurry is atomized by a jet burner, and the organic matter contained therein is gasified under the action of high-temperature incomplete combustion to generate syngas with carbon monoxide and hydrogen as the main components. The syngas is then recycled and used in chemical production.

[0036] The escapable gases in the wastewater are sealed with nitrogen at the wastewater tank and coal mill outlet, and then further recovered to the tail gas treatment device for treatment before being discharged; the sulfur and other elements contained in the wastewater are recovered by subsequent devices to produce sulfuric acid.

[0037] The organic compounds such as amides and benzene in the wastewater undergo gasification reactions at high temperatures to generate syngas, effectively utilizing their components and saving energy. Simultaneously producing syngas effectively treats the amide wastewater, solving a common problem in the domestic industry and reducing the wastewater's impact on the surrounding environment.

[0038] The amide waste liquid is sent into the storage tank 4 and, through the metering pump 5, is added to the coal mill 17 for grinding along with the coal from the weighing feeder 3, the water from the water pump 13, and the additives from the additive pump 9, according to a certain ratio. The storage tank is sealed with nitrogen gas 6. The tail gas from the coal mill enters the tail gas adsorption treatment device 17 through 18. After being treated to meet the standards, it is discharged and then processed into coal-water slurry, which enters the coal slurry storage tank 20 for gasification furnace production.

[0039] The amide waste liquid is used with coal, water, and suitable additives to prepare coal-water slurry, which is then used for gasification to produce syngas, co-producing ammonia and ethylene glycol, and producing sulfuric acid as a byproduct.

[0040] The amide waste liquid has a water content of 80-90 wt%, so no drying or dehydration treatment is required.

[0041] The amount of amide waste liquid added accounts for 10-40 wt% of the amount used in the preparation of coal-water slurry.

[0042] The main component of the additive is lignin sulfonate, and the amount of additive used accounts for 0.1-0.5 wt% of the preparation of coal-water slurry.

[0043] Coal-water slurry is used in gasification production, where it reacts at high temperatures above 1300℃, which can completely eliminate the harmful components contained in amide waste liquid.

[0044] The production process for synthesizing syngas from the aforementioned amide waste liquid is as follows:

[0045] 1) High-concentration coal-water slurry is prepared by using amide waste liquid as raw material. The high-concentration coal-water slurry enters the gasification unit and is introduced together with high-purity oxygen. Under high temperature and high pressure, it undergoes incomplete combustion reaction to generate syngas.

[0046] 2) After being cooled in a water bath and saturated with water, the syngas enters the gas purification system after exiting the gasification unit. After purification, the syngas is then used in subsequent units to produce products.

[0047] 3) High sulfur and other impurity gases contained in amide waste liquid are recovered through a sulfur recovery device to produce sulfuric acid;

[0048] 4) The slag in the gasifier solidifies and precipitates after being bathed in water, and is periodically discharged by the slag discharge system of the gasification slag discharge system;

[0049] 5) After the slag discharge system in step 3) discharges the ash water, the heat and water are recycled.

[0050] The incomplete combustion reaction temperature in the gasification reactor is 1300-1400℃, which is sufficient to completely react the organic matter and sulfur in the amide waste liquid.

[0051] In step 1), the high-concentration coal-water slurry obtained from the amide waste liquid enters the gasifier from the top of the gasification unit, and the pressure of the coal-water slurry is 7-8 MPa.

[0052] In step 2): the syngas purification and recovery system includes a cyclone separator, a water scrubbing tower, a gas treatment system and an ash treatment system. The gas washed by the water scrubbing tower is purified by the gas treatment system to obtain syngas with higher purity. The supernatant of the ash water after washing is recycled to the water tower for use as washing liquid.

[0053] In steps 2) and 3): the gas processing system includes a converter, methanol washing, liquid nitrogen washing, sulfur recovery and other devices connected in sequence.

[0054] In step 5): the ash treatment system includes a hot water tower, a low-pressure flash tank, a vacuum flash tank, a settling tank, an ash water tank and a deoxygenation tank connected in sequence. The inlet of the hot water tower is connected to the outlet of the high-pressure ash water, and the outlet of the hot water tower is connected to the inlet of the washing water tower.

[0055] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. An apparatus for the comprehensive utilization of amide waste liquid to produce syngas, characterized in that, Includes a coal bunker (1), the bottom of which is connected to a weighing feeder (3). The weighing feeder (3) is a screw conveyor or belt conveyor equipped with a weighing and metering device. The bottom outlet of the weighing feeder (3) is connected to the inlet of the coal mill (17) through a pipeline. The coal mill (17) is also connected to a water tank (12), an amide waste liquid storage tank (4), and an additive tank (8) through pipelines respectively. A waste liquid feed pump (5), a flow meter and a flow regulating valve (16) are provided between the coal mill (17) and the amide waste liquid storage tank (4). An additive feed pump (9), an additive flow meter and an additive flow regulating valve (15) are provided between the coal mill (17) and the additive tank (8). A coal mill (17) and a water tank (12) are provided with a coal mill water pump (13), a coal mill water flow meter and a coal mill water flow regulating valve (14). The amide waste liquid storage tank (4) is equipped with a nitrogen seal (6) and a tail gas adsorption treatment device (7), and a stirring device is installed in the storage tank to prevent blockage.

2. The apparatus for comprehensive utilization of amide wastewater to produce syngas according to claim 1, characterized in that, The additive tank (8) is equipped with an additive feed line (11) and a water supply line (10), and is also equipped with a stirring device to adjust the additive concentration and dosage according to the formula.

3. The apparatus for comprehensive utilization of amide wastewater to produce syngas according to claim 2, characterized in that, The coal mill (17) is equipped with a ventilation pipe (18) and a tail gas adsorption treatment device (7). The coal mill (17) is also connected to the coal slurry storage tank (20) through a pipeline and sent to the post-gasification reaction device (22) by the coal slurry pump (21). The coal slurry storage tank (20) and the coal slurry pump (21) are equipped with flushing pipeline (19) and sewage discharge pipeline to prevent sedimentation and blockage.

4. The apparatus for comprehensive utilization of amide wastewater to produce syngas according to claim 3, characterized in that, The gasification reaction device (22) includes an injection device (23) and a cooling device (24) arranged sequentially from top to bottom; the injection device (23) includes a coal slurry inlet, an oxygen inlet, and a cooling water inlet and outlet.

5. The apparatus for comprehensive utilization of amide wastewater to produce syngas according to claim 4, characterized in that, The cooling device (24) is a coil-type or jacket-type cooling device.

6. The apparatus for comprehensive utilization of amide wastewater to produce syngas according to claim 5, characterized in that, The outlet of the gasification reaction device (22) is connected to a gas purification system, which is used to purify the synthesis gas before it enters the subsequent devices to produce products.

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