Coal chemical torch wastewater resource utilization device

Abstract

The utility model relates to the technical field of coal chemical industry torch waste water resource utilization, in particular to a coal chemical industry torch waste water resource utilization device which comprises a liquid separation water seal tank, an acid gas liquid separation tank, a start torch, an acid gas torch, a grinding water tank and a coal mill, the liquid separation water seal tank is provided with a water seal section and a liquid separation section, and an overflow baffle is arranged between the water seal section and the liquid separation section. The water seal section is communicated with a waste gas inlet pipeline, a waste gas discharge pipeline is communicated between the liquid separation section and the start torch, the liquid separation section and the grinding water tank are communicated with a first waste liquid pipeline, the grinding water tank and the coal mill are communicated with a second waste liquid pipeline, and the acid gas liquid separation tank is communicated with an acid waste gas inlet pipeline. An acid waste gas discharge pipeline is communicated between the acid gas liquid separation tank and the acid gas torch; and a third waste liquid pipeline is communicated between the acid gas liquid separation tank and the first waste liquid pipeline. The device effectively improves the utilization rate of coal chemical industry wastewater, and can reduce the pollution degree of industrial waste gas to the environment.

Description

Technical Field

[0001] The utility model relates to the technical field of coal chemical industry flare waste water resource utilization, and is a coal chemical industry flare waste water resource utilization device. Background Art

[0002] Xinjiang has abundant coal reserves and high coal quality reaction activity, which is suitable for coal-fired power and coal chemical production. A coal chemical enterprise is a new type of coal chemical enterprise that uses Xinjiang local bituminous coal as raw material to produce methanol and urea. It uses advanced gasification technology to extract alcohol and ammonia from coal powder to produce methanol and urea.

[0003] The coal ash from Xinjiang coal has a low content of refractory compounds such as alumina and alkaline compounds, and the overall ash melting point is not high, resulting in a relatively high risk of slagging in the gasification process. The high slagging rate leads to a low energy conversion rate in the coal gasification process, causing certain economic losses to coal chemical companies.

[0004] The gasification flare process system will produce a certain amount of high COD, high ammonia nitrogen, and difficult-to-degrade organic wastewater during production and operation. The main sources are industrial wastewater collected from the waste gas generated by the gasification process in the liquid collecting tank, process condensate generated in the flare exhaust gas, and some droplets entrained in the discharge process. Characteristics of industrial wastewater in coal chemical enterprises: First, industrial wastewater is flammable, toxic, and corrosive, resulting in a high risk factor for industrial wastewater treatment processes; second, industrial wastewater is large in volume, complex in composition, contains a large amount of solid suspended particles, process slag, and high concentration of pollutants, resulting in a high difficulty factor for industrial wastewater treatment processes; third, many organic pollutants in industrial wastewater are difficult to degrade. High-concentration difficult-to-degrade organic wastewater refers to a high concentration of organic matter (measured in COD), which is not only harmful to the human body, but also to the ecological balance of microorganisms.

[0005] In order to avoid polluting and harming the regional atmospheric environment and production environment, coal chemical enterprises will send the above industrial waste gas to the flare for incineration before discharging it, and send industrial wastewater to the sewage treatment station for treatment. After the flare burns the industrial waste gas, the flare exhaust gas still carries high COD, high ammonia nitrogen, and difficult-to-degrade process condensate droplets, which will also pollute and harm the regional atmospheric environment and production environment. The sewage treatment station will also frequently run overloaded, especially the increased denitrification pressure and a large number of difficult-to-treat solid particles, which bring difficult-to-solve technical problems to the sewage treatment station. Summary of the invention

[0006] The utility model provides a coal chemical flare wastewater resource utilization device, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems of high difficulty coefficient of industrial wastewater treatment and serious environmental pollution in the existing coal chemical gasification flare process system.

[0007] The technical scheme of the utility model is realized through the following measures: a coal chemical flare wastewater resource utilization device, including a liquid separation water seal tank, an acid gas liquid separation tank, a start-up flare, an acid gas flare, a grinding water tank, and a coal mill. A water seal section and a liquid separation section are arranged inside the liquid separation water seal tank, an overflow baffle is arranged between the water seal section and the liquid separation section, a first inlet at the top of the water seal section of the liquid separation water seal tank is fixedly connected to a waste gas inlet pipeline, a second inlet at the top of the water seal section of the liquid separation water seal tank is fixedly connected to a water inlet pipeline, and a gas outlet at the top of the liquid separation section of the liquid separation water seal tank is fixedly connected to the gas inlet at the bottom of the start-up flare. A waste gas discharge pipeline is connected, a first waste liquid pipeline is fixedly connected between the bottom liquid outlet of the separation section of the separation water seal tank and the upper liquid inlet of the grinding water tank, a second waste liquid pipeline is fixedly connected between the lower liquid outlet of the grinding water tank and the liquid inlet of the coal mill, a coal slurry delivery pipeline is fixedly connected to the coal mill outlet, an acid waste gas inlet pipeline is fixedly connected to the top inlet of the acid gas separation tank, an acid waste gas discharge pipeline is fixedly connected between the top air outlet of the acid gas separation tank and the lower air inlet of the acid gas flare, and a third waste liquid pipeline is fixedly connected between the bottom liquid outlet of the acid gas separation tank and the first waste liquid pipeline.

[0008] The following are further optimizations and / or improvements to the above utility model technical solution:

[0009] The exhaust gas inlet pipeline outlet extends below the liquid level of the water seal section.

[0010] The water seal section of the liquid separation water seal tank is fixedly connected with a steam pipeline, and the outlet of the steam pipeline is connected below the liquid level of the water seal section.

[0011] The water seal section of the liquid separation water seal tank is provided with a first liquid level gauge, and the liquid separation section of the liquid separation water seal tank is provided with a second liquid level gauge.

[0012] The acid gas separation tank is provided with a third liquid level gauge.

[0013] A condensate pump is fixedly installed on the first waste liquid pipeline between the third waste liquid pipeline and the upper liquid inlet of the grinding water tank.

[0014] A grinding water tank pump is fixedly installed on the second waste liquid pipeline.

[0015] A sewage pipeline is fixedly connected to the first waste liquid pipeline between the liquid outlet of the condensate pump and the upper liquid inlet of the grinding water tank. A grinding water pool is arranged at the outlet of the sewage pipeline, and the outlet of the sewage pipeline extends into the grinding water pool.

[0016] A first control valve is fixedly installed on the first waste liquid pipeline between the bottom liquid outlet of the above-mentioned liquid separation water seal tank and the third waste liquid pipeline, a second control valve is fixedly installed on the third waste liquid pipeline, and a third control valve is fixedly installed on the water inlet pipeline.

[0017] The above device also includes a controller, and the first liquid level gauge, the second liquid level gauge, the third liquid level gauge, the first control valve, the second control valve, the third control valve, the condensate pump, and the grinding water tank pump are all electrically connected to the controller.

[0018] The utility model has a reasonable and compact structure and is easy to use. It combines process control technology with terminal treatment technology to explore more scientific ways to optimize the utilization of flare wastewater resources, effectively improve the utilization rate of coal chemical flare wastewater, and reduce the degree of environmental pollution of flare exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attached Figure 1 This is a schematic diagram of the process flow of the utility model.

[0020] Attached Figure 1 The codes are: 1 for liquid separation water seal tank, 2 for acid gas liquid separation tank, 3 for start-up torch, 4 for acid gas torch, 5 for grinding water tank, 6 for coal mill, 7 for the third control valve, 8 for controller, 9 for overflow baffle, 10 for waste gas inlet pipeline, 11 for water inlet pipeline, 12 for waste gas discharge pipeline, 13 for the first waste liquid pipeline, 14 for the second waste liquid pipeline, 15 for coal slurry transportation pipeline, 16 for acid waste gas inlet pipeline, 17 for acid waste gas discharge pipeline, 18 for the third waste liquid pipeline, 19 for steam pipeline, 20 for the first liquid level gauge, 21 for the second liquid level gauge, 22 for the third liquid level gauge, 23 for condensate pump, 24 for grinding water tank pump, 25 for sewage pipeline, 26 for grinding water tank, 27 for the first control valve, and 28 for the second control valve. DETAILED DESCRIPTION

[0021] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.

[0022] In the present invention, unless otherwise specified, the equipment and devices used are all the equipment and devices known and used in the art.

[0023] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached manual. Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 It is determined by the layout direction.

[0024] The present invention is further described below in conjunction with the embodiments and drawings:

[0025] Embodiment 1: As attached Figure 1As shown, the coal chemical flare wastewater resource utilization device comprises a liquid separation water seal tank 1, an acid gas liquid separation tank 2, a start-up flare 3, an acid gas flare 4, a grinding water tank 5, and a coal mill 6. The liquid separation water seal tank 1 is provided with a water seal section and a liquid separation section, an overflow baffle 9 is provided between the water seal section and the liquid separation section, a first inlet at the top of the water seal section of the liquid separation water seal tank 1 is fixedly connected to a waste gas inlet pipeline 10, a second inlet at the top of the water seal section of the liquid separation water seal tank 1 is fixedly connected to a water inlet pipeline 11, a waste gas discharge pipeline 12 is fixedly connected between an air outlet at the top of the liquid separation section of the liquid separation water seal tank 1 and an air inlet at the bottom of the start-up flare 3, and the liquid separation water seal tank 1 is provided with a water seal section. A first waste liquid pipeline 13 is fixedly connected between the bottom liquid outlet of the liquid separation section of the sealing tank 1 and the upper liquid inlet of the grinding water tank 5, a second waste liquid pipeline 14 is fixedly connected between the lower liquid outlet of the grinding water tank 5 and the liquid inlet of the coal mill 6, a coal slurry conveying pipeline 15 is fixedly connected to the outlet of the coal mill 6, an acid waste gas inlet pipeline 16 is fixedly connected to the top inlet of the acid gas liquid separator tank 2, an acid waste gas discharge pipeline 17 is fixedly connected between the top gas outlet of the acid gas liquid separator tank 2 and the lower gas inlet of the acid gas flare 4, and a third waste liquid pipeline 18 is fixedly connected between the bottom liquid outlet of the acid gas liquid separator tank 2 and the first waste liquid pipeline 13.

[0026] The liquid separation water seal tank 1 is an important component of the device. One of its main functions is to prevent the flashback phenomenon of the start-up torch 3 due to the imbalance of the system circulation pressure, thereby protecting the safe operation of the waste gas exhaust pipeline 12 and the start-up torch 3. Secondly, it can be used as a pressure control device to maintain the pressure stability of the first waste liquid pipeline 13, the condensate pump 23, the second waste liquid pipeline 14, the grinding water tank 5, the grinding water tank pump 24, and the coal mill 6 system pipelines and equipment.

[0027] The above-mentioned coal chemical flare wastewater resource utilization device can be further optimized and / or improved according to actual needs:

[0028] As attached Figure 1 As shown, the outlet of the exhaust gas inlet pipeline 10 extends below the liquid level of the water seal section.

[0029] As needed, when the exhaust gas enters the sealing water in the water seal section, the condensate and part of the gas in the exhaust gas can be dissolved in water. When the liquid level in the water seal section is higher than the overflow baffle 9, the mixed liquid in the water seal section overflows to the liquid separation section.

[0030] As attached Figure 1 As shown, the water seal section of the liquid separation water seal tank 1 is fixedly connected with a steam pipeline 19, and the outlet of the steam pipeline 19 is connected below the liquid level of the water seal section.

[0031] As required, steam is introduced into the sealing water of the water seal section through the steam pipeline 19 to accelerate the stripping of ammonia nitrogen in the sealing water and reduce the amount of ammonia nitrogen in the wastewater discharged from the separation water seal tank 1.

[0032] As attached Figure 1As shown, the water seal section of the liquid separation water seal tank 1 is provided with a first liquid level gauge 20 , and the liquid separation section of the liquid separation water seal tank 1 is provided with a second liquid level gauge 21 .

[0033] As attached Figure 1 As shown, a third liquid level meter 22 is provided on the acid gas separation tank 2 .

[0034] As attached Figure 1 As shown, a condensate pump 23 is fixedly installed on the first waste liquid pipeline 13 between the third waste liquid pipeline 18 and the upper liquid inlet of the grinding water tank 5.

[0035] As attached Figure 1 As shown, a grinding water tank pump 24 is fixedly installed on the second waste liquid pipeline 14 .

[0036] As attached Figure 1 As shown, a sewage pipeline 25 is fixedly connected to the first waste liquid pipeline 13 between the liquid outlet of the condensate pump 23 and the upper liquid inlet of the grinding water tank 5, and a grinding water pool 26 is arranged at the outlet of the sewage pipeline 25, and the outlet of the sewage pipeline 25 extends into the grinding water pool 26.

[0037] As needed, when the device is shut down for regular inspection and maintenance, wastewater containing impurities such as sludge, rust, and scale flakes that has been accumulated in the process pipelines and equipment of the device for a long time can be discharged through the sewage pipeline 25. The grinding water tank 26 can be used to store these wastewaters to prevent the wastewater from leaking into the ground or overflowing to the ground, so as to avoid polluting the environment.

[0038] As attached Figure 1 As shown, a first control valve 27 is fixedly installed on the first waste liquid pipeline 13 between the bottom liquid outlet of the liquid separation water seal tank 1 and the third waste liquid pipeline 18, a second control valve 28 is fixedly installed on the third waste liquid pipeline 18, and a third control valve 7 is fixedly installed on the water inlet pipeline 11.

[0039] As attached Figure 1 As shown, the device also includes a controller 8, and the first liquid level gauge 20, the second liquid level gauge 21, the third liquid level gauge 22, the first control valve 27, the second control valve 28, the third control valve 7, the condensate pump 23, and the grinding water tank pump 24 are all electrically connected to the controller 8.

[0040] According to the needs, when the liquid level of the first liquid level gauge 20 is lower than the system specified value, the opening of the third control valve 7 can be increased, and clean water can be supplied to the water seal section through the water inlet pipeline 11. When the liquid level of the second liquid level gauge 21 shows that the liquid level in the liquid separation section is higher than the height of the overflow baffle 9, the opening of the first control valve 27 can be increased, and the waste liquid discharge can be increased through the first waste liquid pipeline 13. When the liquid level of the third liquid level gauge 22 is higher than the system specified value, the opening of the second control valve 28 can be increased, and the waste liquid discharge can be increased through the third waste liquid pipeline 18.

[0041] According to the needs, the pipelines and equipment of the coal chemical flare wastewater resource utilization device can also be provided with conventional valves, thermometers and pressure gauges known in the art according to production needs. The controller 8 is a DCS controller, and the model of the DCS controller can be the CS3000 controller produced by Yokogawa Corporation of Japan.

[0042] The above technical features constitute the embodiments of the present utility model, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

[0043] The use process of the embodiment of the utility model is as follows: first, the industrial waste gas enters the clean water in the water seal section of the liquid separation water seal tank 1 through the waste gas inlet pipeline 10, the ammonia nitrogen in the industrial waste gas is stripped through the water seal section, and the industrial waste gas is further separated into gas and liquid through the liquid separation section; then, the waste gas after gas-liquid separation enters the start-up torch 3 through the waste gas discharge pipeline 12 for combustion and then discharge, and the waste liquid after gas-liquid separation enters the grinding water tank 5 for storage through the first waste liquid pipeline 13. At this time, the acidic industrial waste gas enters the acidic gas separator tank 2 through the acidic waste gas inlet pipeline 16, and the acidic gas separator tank 2 separates the acidic industrial waste gas into gas and liquid. The acidic waste gas after gas-liquid separation enters the acidic gas flare 4 through the acidic waste gas discharge pipeline 17 for combustion and then discharge. The waste liquid after gas-liquid separation enters the grinding water tank 5 through the third waste liquid pipeline 18 and the first waste liquid pipeline 13 for storage; finally, the waste liquid in the grinding water tank 5 enters the coal mill 6 through the second waste liquid pipeline 14, and the required amount of additives is added to the coal mill 6. The coal mill 6 grinds the coal slag, water, and additives in the waste liquid into water-coal slurry of a certain concentration and particle size, and the water-coal slurry enters the downstream bituminous coal gasification process system through the coal slurry conveying pipeline 15 for reuse as a reaction raw material.

Claims

1. A coal chemical flare wastewater resource utilization device, characterized in that It includes a liquid separation water seal tank, an acid gas liquid separation tank, a start-up torch, an acid gas torch, a grinding water tank, and a coal mill. The liquid separation water seal tank is provided with a water seal section and a liquid separation section, an overflow baffle is provided between the water seal section and the liquid separation section, a first inlet at the top of the water seal section of the liquid separation water seal tank is fixedly connected to a waste gas inlet pipeline, a second inlet at the top of the water seal section of the liquid separation water seal tank is fixedly connected to a water inlet pipeline, a waste gas discharge pipeline is fixedly connected between the top air outlet of the liquid separation section of the liquid separation water seal tank and the lower air inlet of the start-up torch, and the liquid separation section of the liquid separation water seal tank is fixedly connected to the waste gas discharge pipeline. A first waste liquid pipeline is fixedly connected between the bottom liquid outlet and the upper liquid inlet of the grinding water tank, a second waste liquid pipeline is fixedly connected between the lower liquid outlet of the grinding water tank and the liquid inlet of the coal mill, a coal slurry conveying pipeline is fixedly connected to the coal mill outlet, an acid waste gas inlet pipeline is fixedly connected to the top inlet of the acid gas separator tank, an acid waste gas discharge pipeline is fixedly connected between the top gas outlet of the acid gas separator tank and the lower gas inlet of the acid gas flare, and a third waste liquid pipeline is fixedly connected between the bottom liquid outlet of the acid gas separator tank and the first waste liquid pipeline.

2. The coal chemical flare wastewater resource utilization device according to claim 1, characterized in that The outlet of the exhaust gas inlet pipeline extends below the liquid level of the water seal section.

3. The coal chemical flare wastewater resource utilization device according to claim 1 or 2, characterized in that The water seal section of the liquid separation water seal tank is fixedly connected with a steam pipeline, and the outlet of the steam pipeline is connected below the liquid level of the water seal section.

4. The coal chemical flare wastewater resource utilization device according to claim 1 or 2, characterized in that The water seal section of the liquid separation water seal tank is provided with a first liquid level gauge, and the liquid separation section of the liquid separation water seal tank is provided with a second liquid level gauge.

5. The coal chemical flare wastewater resource utilization device according to claim 4, characterized in that A third liquid level gauge is provided on the acid gas separator tank.

6. The coal chemical flare wastewater resource utilization device according to claim 1, 2 or 5, characterized in that A condensate pump is fixedly installed on the first waste liquid pipeline between the third waste liquid pipeline and the upper liquid inlet of the grinding water tank.

7. The coal chemical flare wastewater resource utilization device according to claim 6, characterized in that A grinding water tank pump is fixedly installed on the second waste liquid pipeline.

8. The coal chemical flare wastewater resource utilization device according to claim 7, characterized in that A sewage pipeline is fixedly connected to the first waste liquid pipeline between the liquid outlet of the condensate pump and the liquid inlet on the upper part of the grinding water tank. A grinding water pool is arranged at the outlet of the sewage pipeline, and the outlet of the sewage pipeline extends into the grinding water pool.

9. The coal chemical flare wastewater resource utilization device according to claim 7 or 8, characterized in that A first control valve is fixedly installed on the first waste liquid pipeline between the bottom liquid outlet of the liquid separation water seal tank and the third waste liquid pipeline, a second control valve is fixedly installed on the third waste liquid pipeline, and a third control valve is fixedly installed on the water inlet pipeline.

10. The coal chemical flare wastewater resource utilization device according to claim 9, characterized in that It also includes a controller, and the first liquid level meter, the second liquid level meter, the third liquid level meter, the first control valve, the second control valve, the third control valve, the condensate pump, and the grinding water tank pump are all electrically connected to the controller.

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