Brine associated gas purification and recovery system

Abstract

The brine associated gas purification and recovery system comprises a brine pipeline, a gas-liquid separation tank, a gas condenser, a first purification adsorption tank, a natural gas storage tank and a brine pool, the input end of the brine pipeline is connected with the salt well; the input end of the gas-liquid separation tank is connected with the output end of the brine pipeline; the gas output end of the gas-liquid separation tank is connected with the input end of the gas condenser, and the liquid output end of the gas-liquid separation tank is connected with the brine pool; the gas output end of the gas condenser is connected with the input end of the first purification adsorption tank, and the gas output end of the first purification adsorption tank is connected with the natural gas storage tank. The problem that in the prior art, brine associated gas is discharged to pollute the environment is solved, the technical effect of recycling and utilizing methane gas in the brine associated gas is achieved, waste water generated in the system is treated and recycled, the problem that the brine associated gas is discharged to pollute the environment is solved, and the operation stability of the system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste gas treatment, in particular to a brine associated gas purification and recovery system. BACKGROUND

[0002] In the whole halogen process, the brine is injected into the 2700-meter underground salt mine layer by the high-pressure halogen pump, and the saturated sodium chloride solution is obtained by dissolution for chlor-alkali production. Because the composition of the underground salt mine layer is complex, some insoluble gases (referred to as "brine associated gas", mainly composed of methane, hydrogen sulfide, phosphine, etc.) exist. During the dissolution of the salt mine, the brine associated gas is dispersed in the air environment when entering the halogen pool with the brine. The harmful gas inevitably pollutes and damages the surrounding buildings and crops, and also causes certain harm to the health of the operating personnel and the surrounding residents.

[0003] The brine associated gas collection and treatment process is relatively lagging behind. The general solution is to ignite and discharge the brine associated gas into the atmosphere after simple gas-liquid separation, which not only wastes energy but also pollutes the environment. In addition, since the main component of the associated gas is alkane, it is a rare and non-renewable high-quality resource. If it can be completely recovered, it not only reduces air pollution but also collects and stores high-quality energy. For those skilled in the art, how to realize the purification and recovery and utilization of this part of gas, reduce the pollution of harmful components in the brine associated gas to the environment, and ensure the safety of the halogen process is a technical problem to be solved at present. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a brine associated gas purification and recovery system, which solves the problem of environmental pollution caused by the discharge of brine associated gas in the prior art, realizes the technical effect of recycling and utilizing the methane gas in the brine associated gas, and handles and recycles the waste water generated in the system to prevent the problem of environmental pollution caused by the discharge of brine associated gas, and improves the stability of system operation.

[0005] The utility model embodiment provides a kind of brine associated gas purification and recovery system, including brine pipeline, gas-liquid separation tank, gas condenser, first purification adsorption tank, natural gas storage tank and halogen pool;The input end of the brine pipeline is connected with salt well;The input end of the gas-liquid separation tank is connected with the output end of the brine pipeline;The gas output end of the gas-liquid separation tank is connected with the input end of the gas condenser, and the liquid output end of the gas-liquid separation tank is connected with the halogen pool;The gas output end of the gas condenser is connected with the input end of the first purification adsorption tank, and the gas output end of the first purification adsorption tank is connected with the natural gas storage tank.

[0006] In a possible implementation, the system further comprises a second purification adsorption tank; a gas output end of the gas-liquid separation tank is connected to an input end of the second purification adsorption tank; and a gas output end of the second purification adsorption tank is connected to the natural gas storage tank.

[0007] In a possible implementation, a gas output end of the first purification adsorption tank is further connected to an input end of the second purification adsorption tank.

[0008] In a possible implementation, a liquid output end of the gas condenser is connected to the brine tank.

[0009] In a possible implementation, waste water output from the first purification adsorption tank and the second purification adsorption tank is input to a waste water treatment device for treatment.

[0010] In a possible implementation, a composite high-speed air valve is further connected between the gas-liquid separation tank and the gas condenser.

[0011] In a possible implementation, a flow meter and an induced draft fan are sequentially connected between the gas condenser and the first purification adsorption tank.

[0012] In a possible implementation, a natural gas compressor is connected to an output end of the natural gas storage tank, the natural gas compressor is used to compress natural gas in the natural gas storage tank, and the compressed natural gas is delivered to a natural gas user for use.

[0013] In a possible implementation, a brine pump is connected to an output end of the brine tank, the brine pump is used to deliver brine in the brine tank to a brine user for use.

[0014] One or more technical solutions provided in the present application have at least the following technical effects:

[0015] The utility model discloses an embodiment adopts a kind of brine associated gas purification recovery system, including brine pipeline, gas-liquid separation tank, gas condenser, first purification adsorption tank, natural gas storage tank and brine pool;The input end of brine pipeline is connected with salt well;Brine in salt well is transported to purification recovery system by brine pipeline and is handled, wherein, after gas is separated by gas-liquid separation tank, liquid brine returns brine pool, gas is condensed again by entering gas condenser after passing through composite high-speed air valve, after associated gas after separation passes through flowmeter, induced draft fan enters purification adsorption tank and then enters natural gas storage tank after removing harmful ingredients, and is transported to user after passing through natural gas compressor.Exhausted liquid of adsorption tank is sent to waste water treatment device and is treated innocuously.The present application solves the problem of environmental pollution caused by brine associated gas discharge in the prior art, realizes the technical effect of recycling and utilizing methane gas in brine associated gas, and treats and recycles waste water generated in the system, prevents the problem of environmental pollution caused by brine associated gas discharge, and improves the stability of system operation. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0017] Figure 1 A process flow diagram of a brine associated gas purification recovery system provided by the embodiments of the present application.

[0018] Icon: 1-brine pipeline; 2-gas-liquid separation tank; 3-gas condenser; 4-first purification adsorption tank; 5-natural gas storage tank; 6-brine pool; 7-salt well; 8-second purification adsorption tank; 9-composite high-speed air valve; 10-flowmeter; 11-induced draft fan; 12-natural gas compressor; 13-brine pump. DETAILED DESCRIPTION

[0019] The technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] In the description of the embodiments of the utility model, it needs to be explained that, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the embodiments of the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. The terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In addition, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the embodiments of the utility model can be understood according to the specific circumstances.

[0021] The utility model embodiments provide a kind of brine associated gas purification recovery system, as shown in figure Figure 1 Brine pipeline 1, gas-liquid separation tank 2, gas condenser 3, first purification adsorption tank 4, natural gas storage tank 5 and brine pool 6;The input end of brine pipeline 1 is connected with salt well 7;The input end of gas-liquid separation tank 2 is connected with the output end of brine pipeline 1;The gas output end of gas-liquid separation tank 2 is connected with the input end of gas condenser 3, and the liquid output end of gas-liquid separation tank 2 is connected with brine pool 6;The gas output end of gas condenser 3 is connected with the input end of first purification adsorption tank 4, and the gas output end of first purification adsorption tank 4 is connected with natural gas storage tank 5.

[0022] Exemplarily, brine in salt well 7 returns to ground and flows into main pipe after, after gas-liquid separation in gas-liquid separation tank 2, liquid brine returns to brine pool 6, gas enters gas condenser 3 again and condenses to realize gas-liquid separation after passing through composite high-speed air valve 9, associated gas after separation enters natural gas storage tank 5 after removing harmful components by flow meter 10 and air blower 11, and is transported to user after passing through natural gas compressor 12. Waste liquid discharged from adsorption tank is sent to waste water treatment device for harmless treatment. The application utilizes gas-liquid separation tank 2 to separate gas-liquid, utilizes active carbon and other high-efficiency adsorbents to process salt well 7 associated gas, designs new process treatment method, and realizes the recycling of associated gas.

[0023] Exemplarily, it further includes PLC control system, and artificial can control purification recovery system by PLC control system.

[0024] Exemplarily, gas condenser 3 is recycled after adopting plant area domestic water for cooling.

[0025] In the embodiments of this application, such as Figure 1 As shown, it also includes a second purification adsorption tank 8; the gas output end of the gas-liquid separator 2 is connected to the input end of the second purification adsorption tank 8; the gas output end of the second purification adsorption tank 8 is connected to the natural gas storage tank 5.

[0026] In the embodiments of this application, such as Figure 1 As shown, the gas output end of the first purification adsorption tank 4 is also connected to the input end of the second purification adsorption tank 8.

[0027] For example, the first purification adsorption tank 4 and the second purification adsorption tank 8 can be selected to use one of the purification adsorption tanks or to use the first purification adsorption tank 4 and the second purification adsorption tank 8 in series, depending on the amount of associated gas. The input end of the first purification adsorption tank 4 and the second purification adsorption tank 8 are both provided with valves.

[0028] In the embodiments of this application, such as Figure 1 As shown, the liquid output end of the gas condenser 3 is connected to the brine tank 6.

[0029] In the embodiments of this application, such as Figure 1 As shown, the wastewater output from the first purification adsorption tank 4 and the second purification adsorption tank 8 is fed into the wastewater treatment device for treatment.

[0030] In the embodiments of this application, such as Figure 1 As shown, a compound high-speed air valve 9 is also connected between the gas-liquid separator 2 and the gas condenser 3;

[0031] In the embodiments of this application, such as Figure 1 As shown, a flow meter 10 and an induced draft fan 11 are connected in sequence between the gas condenser 3 and the first purification adsorption tank 4;

[0032] In the embodiments of this application, such as Figure 1 As shown, the output end of the natural gas storage tank 5 is connected to a natural gas compressor 12. The natural gas in the natural gas storage tank 5 is compressed by the natural gas compressor 12 and delivered to the natural gas user for use.

[0033] In the embodiments of this application, such as Figure 1 As shown, the output end of the brine tank 6 is connected to a brine pump 13, which delivers the brine in the brine tank 6 to brine users for use.

[0034] For example, during implementation, the brine produced by the salt well 7 returns to the ground and flows into the brine pipeline 1. After gas-liquid separation by the gas-liquid separator 2, the liquid brine returns to the brine pool 6 through the brine pipeline. The gas passes through the compound high-speed air valve 9 and enters the gas condenser 3 for condensation to achieve gas-liquid separation again. The condensate after separation is discharged into the brine pool 6. The separated associated gas passes through the flow meter 10 and the induced draft fan 11 and enters the first purification adsorption tank 4 and the second purification adsorption tank 8 to remove harmful components before entering the natural gas storage tank 5. Then, it is transported to the natural gas user by the natural gas compressor 12.

[0035] For example, the natural gas storage tank 5 is equipped with a pressure detection device on top to ensure that the waste liquid discharged from the first purification adsorption tank 4 and the second purification adsorption tank 8 is transported to the wastewater treatment device for harmless treatment. All devices in the purification and recovery system are sealed and connected by pipelines, flanges, and bolts.

[0036] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0037] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A brine associated gas purification and recovery system, characterized by, It comprises a brine pipeline (1), a gas-liquid separation tank (2), a gas condenser (3), a first purification adsorption tank (4), a natural gas storage tank (5) and a brine pool (6); The input end of the brine pipeline (1) is connected with a salt well (7); The input end of the gas-liquid separation tank (2) is connected with the output end of the brine pipeline (1); The gas output end of the gas-liquid separation tank (2) is connected with the input end of the gas condenser (3), and the liquid output end of the gas-liquid separation tank (2) is connected with the brine pool (6); The gas output end of the gas condenser (3) is connected with the input end of the first purification adsorption tank (4), and the gas output end of the first purification adsorption tank (4) is connected with the natural gas storage tank (5).

2. The brine associated gas purification and recovery system of claim 1, wherein, It further comprises a second purification adsorption tank (8); The gas output end of the gas-liquid separation tank (2) is connected with the input end of the second purification adsorption tank (8); The gas output end of the second purification adsorption tank (8) is connected with the natural gas storage tank (5).

3. The brine associated gas purification and recovery system of claim 2, wherein, The gas output end of the first purification adsorption tank (4) is also connected with the input end of the second purification adsorption tank (8).

4. The brine associated gas purification and recovery system of claim 1, wherein, The liquid output end of the gas condenser (3) is connected with the brine pool (6).

5. The brine associated gas purification and recovery system of claim 2, wherein, The waste water output by the first purification adsorption tank (4) and the second purification adsorption tank (8) is input to a waste water treatment device for treatment.

6. The brine associated gas purification and recovery system of claim 1, wherein, A composite high-speed air valve (9) is further connected between the gas-liquid separation tank (2) and the gas condenser (3).

7. The brine associated gas purification and recovery system of claim 1, wherein, A flow meter (10) and an induced draft fan (11) are sequentially connected between the gas condenser (3) and the first purification adsorption tank (4).

8. The brine associated gas purification and recovery system of claim 1, wherein, A natural gas compressor (12) is connected with the output end of the natural gas storage tank (5), which compresses the natural gas in the natural gas storage tank (5) and delivers it to natural gas users for use.

9. The brine associated gas purification and recovery system of claim 1, wherein, A brine delivery pump (13) is connected with the output end of the brine pool (6), which delivers the brine in the brine pool (6) to brine users for use.

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