A triethylene glycol dehydration unit containing sulfur tail gas ejection treatment skid

Abstract

The utility model discloses a triethylene glycol dehydration unit sulfur-containing tail gas injection processing skid relates to natural gas processing technical field, including integrated refrigeration cooling unit, cryogenic heat exchanger, set up between integrated refrigeration cooling unit and cryogenic heat exchanger's first pipeline type separator and set up in the output of cryogenic heat exchanger's second pipeline type separator. Through the setting of integrated refrigeration cooling unit and cryogenic heat exchanger, can effectively reduce tail gas temperature, ensure moisture, triethylene glycol, hydrogen sulfide and heavy hydrocarbon etc. Pollutant completely separates out, and the first pipeline type separator and second pipeline type separator synergistic effect can further strengthen gas -liquid separation effect, avoid pollutant residue.

Description

Technical Field

[0001] This utility model relates to the field of natural gas processing technology, and in particular to a triethylene glycol dehydration device with a sulfur-containing tail gas ejector skid. Background Technology

[0002] Before natural gas enters the pipeline network, it must undergo dehydration treatment to meet relevant process requirements and prevent pipeline corrosion and hydrate formation caused by moisture. Triethylene glycol (TEG) dehydration is currently the most commonly used method for natural gas dehydration. In this process, TEG absorbs moisture from the natural gas while removing some hydrogen sulfide, aromatic hydrocarbons, and other contaminants. To save energy, TEG needs to be reused, thus requiring regeneration. However, the regeneration process generates sulfur-containing tail gas, which contains natural gas, moisture, and other volatile components such as aromatic hydrocarbons and sulfides. If this tail gas is emitted without effective treatment, it not only wastes resources but also pollutes the environment.

[0003] To remove harmful components such as hydrogen sulfide from exhaust gases, traditional processes use incinerators to burn sulfur-containing exhaust gases. However, while this technology can treat sulfur-containing exhaust gases quickly, it relies heavily on external fuel gas combustion, essentially converting recoverable resources (light hydrocarbons, triethylene glycol) into heat energy, a typical "energy-for-energy" model. Simultaneously, high-temperature combustion generates acidic gases (such as CO2 and NO). X The presence of acidic gases (such as SO2, SO3) and water vapor, which are highly soluble in water, accelerates corrosion of the furnace inner wall and flue, necessitating frequent replacement of the high-temperature alloy lining and increasing maintenance costs. Unrecovered triethylene glycol vapor, once released into the atmosphere, readily absorbs moisture and forms droplets, potentially causing localized environmental pollution.

[0004] Existing technologies for treating the tail gas from triethylene glycol distillation columns typically employ a combination of refrigeration units, coolers, gas-liquid separators, and ejectors for dehydration and pressurization recovery. The basic process is as follows: the refrigeration unit serves as the cold source for the cooler, and the tail gas is condensed and deliquescent in the cooler, including gaseous substances such as triethylene glycol, which are condensed into liquid. Then, gas-liquid separation is achieved through the gas-liquid separator, and the dehydrated tail gas is pressurized by the ejector and transported to the natural gas pipeline network.

[0005] However, in practical applications, single-stage coolers have limited cooling effects when treating exhaust gases with high water content or complex components, resulting in some moisture and sulfides remaining and failing to be effectively removed. Simultaneously, single-stage gas-liquid separators have low separation precision, making it difficult to effectively treat exhaust gases with complex components, especially trace pollutants and moisture in sulfur-containing exhaust gases. Utility Model Content

[0006] The purpose of this invention is to provide a triethylene glycol dehydration device with a sulfur-containing tail gas ejector skid, which can effectively reduce the tail gas temperature and further improve the gas-liquid separation effect.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a triethylene glycol dehydration device sulfur-containing tail gas ejector skid, comprising an integrated refrigeration and cooling unit, a cryogenic heat exchanger, a first pipeline separator disposed between the integrated refrigeration and cooling unit and the cryogenic heat exchanger, and a second pipeline separator disposed at the output end of the cryogenic heat exchanger.

[0008] The technical principle of this utility model is as follows: the exhaust gas can be initially cooled by the integrated refrigeration and cooling unit. The initially cooled exhaust gas enters the first pipeline separator for gas-liquid separation. The separated exhaust gas enters the cryogenic heat exchanger for secondary cooling. The exhaust gas after secondary cooling enters the second pipeline separator for secondary gas-liquid separation.

[0009] Furthermore, an inlet pipe and a return pipe with a circulation pump are installed between the integrated refrigeration and cooling unit and the cryogenic heat exchanger.

[0010] Furthermore, a filter is installed on the return water pipe.

[0011] Furthermore, the first pipeline separator is connected to the low-pressure venting system, and a first switching valve is installed between the first pipeline separator and the low-pressure venting system.

[0012] Furthermore, it also includes a heat balance ejector tube installed at the output end of the second pipeline separator, an inlet pipe between the heat balance ejector tube and the high-pressure natural gas pipeline network, and an outlet pipe between the heat balance ejector tube and the low-pressure natural gas pipeline network.

[0013] Furthermore, the air pipe is equipped with a make-up air pipe that is connected to the second pipeline separator, and the make-up air pipe is equipped with a second switch valve.

[0014] Furthermore, the air supply pipe is connected to the low-pressure venting system, and a third switching valve is installed between the air supply pipe and the low-pressure venting system.

[0015] Furthermore, it also includes a sewage tank that is connected to both the first and second pipeline separators. A fourth switch valve is installed between the first pipeline separator and the sewage tank, and a fifth switch valve is installed between the second pipeline separator and the sewage tank.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. By using an integrated refrigeration and cooling unit and a cryogenic heat exchanger, the exhaust gas temperature can be effectively reduced, ensuring the complete removal of pollutants such as moisture, triethylene glycol, hydrogen sulfide, and heavy hydrocarbons; the combined action of the first and second pipeline separators can further enhance the gas-liquid separation effect and avoid pollutant residue.

[0018] 2. Integrated refrigeration and cooling units can provide refrigerant for cryogenic heat exchangers, thereby significantly reducing refrigeration energy consumption and achieving high efficiency and energy saving;

[0019] 3. By setting up the heat balance ejector, the exhaust gas pressure can be regulated, improving the equipment's adaptability to different operating conditions and exhaust gas components, and ensuring the equipment operates efficiently and stably. Attached Figure Description

[0020] Figure 1 This is a connection diagram of the present invention.

[0021] In the above attached figures:

[0022] 1. Integrated refrigeration and cooling unit; 2. Cryogenic heat exchanger; 3. First pipeline separator; 4. Second pipeline separator; 5. Filter; 6. Heat balance ejector tube; 7. Wastewater tank;

[0023] 8. First switching valve; 9. Second switching valve; 10. Third switching valve; 11. Fourth switching valve; 12. Fifth switching valve; 13. Sixth switching valve; 14. Seventh switching valve; 15. Eighth switching valve; 16. Ninth switching valve; 17. Tenth switching valve; 18. Eleventh switching valve;

[0024] 19. First pressure gauge; 20. Second pressure gauge; 21. Third pressure gauge; 22. Fourth pressure gauge; 23. Fifth pressure gauge; 24. Sixth pressure gauge;

[0025] 25. First temperature sensor; 26. Second temperature sensor; 27. Third temperature sensor; 28. Fourth temperature sensor; 29. ​​Fifth temperature sensor; 30. Sixth temperature sensor;

[0026] 31. First regulating valve; 32. Second regulating valve;

[0027] 33. First vent valve; 34. Second vent valve;

[0028] 35. Flow meter; 36. Check valve. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments; the structures described in various embodiments can be freely combined without conflict in terms of structure or principle.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] The following description, in conjunction with the accompanying drawings, describes some embodiments of the present invention:

[0033] like Figure 1 As shown, this utility model proposes a triethylene glycol dehydration device sulfur-containing tail gas ejector skid, including an integrated refrigeration and cooling unit 1, a cryogenic heat exchanger 2, a first pipeline separator 3 disposed between the integrated refrigeration and cooling unit 1 and the cryogenic heat exchanger 2, and a second pipeline separator 4 disposed at the output end of the cryogenic heat exchanger 2.

[0034] The exhaust gas is introduced into this equipment through the integrated refrigeration and cooling unit 1. The inlet end of the integrated refrigeration and cooling unit 1 is sequentially equipped with a sixth switch valve 13 and a first temperature sensor 25. The sixth switch valve 13 is used to control the introduction of exhaust gas, and the first temperature sensor 25 is used to monitor the temperature introduced into the integrated refrigeration and cooling unit 1.

[0035] A first pressure gauge 19, a second temperature sensor 26, and a seventh switching valve 14 are sequentially installed between the integrated refrigeration and cooling unit 1 and the first pipeline separator 3. An eighth switching valve 15, a second pressure gauge 20, and a third temperature sensor 27 are sequentially installed between the first pipeline separator 3 and the cryogenic heat exchanger 2. A third pressure gauge 21, a fourth temperature sensor 28, and a ninth switching valve 16 are installed between the cryogenic heat exchanger 2 and the second pipeline separator 4. A fourth pressure gauge 22 is installed on the first pipeline separator 3, and a fifth pressure gauge 23 is installed on the second pipeline separator 4.

[0036] The integrated refrigeration and cooling unit 1 can perform preliminary cooling of the exhaust gas. The preliminarily cooled exhaust gas enters the first pipeline separator 3 for gas-liquid separation. The separated exhaust gas enters the cryogenic heat exchanger 2 for secondary cooling. The exhaust gas after secondary cooling enters the second pipeline separator 4 for secondary gas-liquid separation.

[0037] Furthermore, an inlet pipe and a return pipe with a circulation pump are provided between the integrated refrigeration and cooling unit 1 and the cryogenic heat exchanger 2, and a filter 5 is installed on the return pipe.

[0038] A flow meter 35 is installed on the return water pipe. The integrated refrigeration unit 1 not only cools the exhaust gas but also produces low-temperature refrigerant, which is introduced into the cryogenic heat exchanger 2 through the inlet water pipe. The refrigerant can be recycled back to the integrated refrigeration unit 1 through the circulation pump and return water pipe, ensuring the refrigerant circulates within the system, effectively transferring cooling capacity, and ensuring stable cooling of the cryogenic heat exchanger 2, thereby significantly reducing refrigeration energy consumption and achieving high efficiency and energy saving. A fifth temperature sensor 29 is installed on the inlet water pipe to detect the temperature of the refrigerant. The filter 5 is used to filter out excess impurities in the refrigerant to ensure normal operation of the circulation.

[0039] Furthermore, the first pipeline separator 3 is connected to the low-pressure venting system, and a first switching valve 8 is provided between the first pipeline separator 3 and the low-pressure venting system.

[0040] A first vent valve 33 is installed between the first switching valve 8 and the first pipeline separator 3. When the first pipeline separator 3 is working normally, the eighth switching valve 15 is open, and both the first switching valve 8 and the first vent valve 33 are closed, allowing the exhaust gas to flow normally into the cryogenic heat exchanger 2. When the first pipeline separator 3 malfunctions, the eighth switching valve 15 is closed, and both the first switching valve 8 and the first vent valve 33 are open, allowing the exhaust gas to flow into the low-pressure venting system to burn off excess gas.

[0041] Furthermore, it also includes a heat balance ejector tube 6 installed at the output end of the second pipeline separator 4, with an inlet pipe between the heat balance ejector tube 6 and the high-pressure natural gas pipeline network, and an outlet pipe between the heat balance ejector tube 6 and the low-pressure natural gas pipeline network.

[0042] A tenth switching valve 17 and a check valve 36 are installed between the second pipeline separator 4 and the heat balance ejector 6. A first regulating valve 31, a sixth pressure gauge 24, a sixth temperature sensor 30, and an eleventh switching valve 18 are installed sequentially on the inlet pipe. The gas after gas-liquid separation by the second pipeline separator 4 is introduced into the heat balance ejector 6. High-pressure natural gas is introduced into the heat balance ejector 6 through the inlet pipe and fully mixed with the tail gas in the heat balance ejector 6. Through the action of the heat balance ejector 6, the high-pressure natural gas is used as the ejection power source to eject, mix, and adjust the tail gas to the low-pressure natural gas pipeline transmission pressure, replacing the traditional incineration treatment, realizing the resource utilization of tail gas, and improving the equipment's adaptability to different working conditions and tail gas components, ensuring the efficient and stable operation of the equipment.

[0043] Furthermore, the air pipe is provided with a make-up air pipe that is connected to the second pipeline separator 4, and the make-up air pipe is provided with a second switch valve 9.

[0044] A second regulating valve 32 is installed on the gas supply pipe. Part of the mixed gas ejected through the heat balance ejector pipe 6 is introduced into the low-pressure natural gas pipeline network, and the other part is used to pressurize the second pipeline separator 4 through the gas supply pipe to ensure the efficient and stable operation of the equipment.

[0045] Furthermore, the air supply pipe is connected to the low-pressure venting system, and a third switching valve 10 is installed between the air supply pipe and the low-pressure venting system.

[0046] A second vent valve 34 is installed between the third switch valve 10 and the air supply pipe. When the pressure of the second pipeline separator 4 is insufficient, the third switch valve 10 closes, and the mixed gas flows back to the second pipeline separator 4 through the air supply pipe for pressure replenishment. When the heat balance ejector tube 6 fails, the third switch valve 10 opens, and the exhaust gas is discharged into the low-pressure vent system to ensure the stability of the equipment.

[0047] Furthermore, it also includes a sewage tank 7 that is connected to both the first pipeline separator 3 and the second pipeline separator 4. A fourth switch valve 11 is provided between the first pipeline separator 3 and the sewage tank 7, and a fifth switch valve 12 is provided between the second pipeline separator 4 and the sewage tank 7.

[0048] The wastewater separated in the first pipeline separator 3 and the second pipeline separator 4 can be discharged into the wastewater tank 7 to ensure the long-term use of this equipment.

[0049] The integrated refrigeration and cooling unit 1, cryogenic heat exchanger 2, first pipeline separator 3, second pipeline separator 4, heat balance ejector 6, and sewage tank 7 are integrated on the same skid, which can reduce the footprint of the equipment, facilitate installation, and shorten the installation cycle.

Claims

1. A skid for ejecting and treating sulfur-containing tail gas in a triethylene glycol dehydration device, characterized in that: It includes an integrated refrigeration and cooling unit (1), a cryogenic heat exchanger (2), a first pipeline separator (3) disposed between the integrated refrigeration and cooling unit (1) and the cryogenic heat exchanger (2), and a second pipeline separator (4) disposed at the output end of the cryogenic heat exchanger (2).

2. The triethylene glycol dehydration device sulfur-containing tail gas ejector skid according to claim 1, characterized in that, An inlet pipe and a return pipe with a circulation pump are provided between the integrated refrigeration and cooling unit (1) and the cryogenic heat exchanger (2).

3. The triethylene glycol dehydration device sulfur-containing tail gas ejector skid according to claim 2, characterized in that, A filter (5) is installed on the return water pipe.

4. A triethylene glycol dehydration device with sulfur-containing tail gas ejector skid according to any one of claims 1-3, characterized in that, The first pipeline separator (3) is connected to the low-pressure venting system, and a first switching valve (8) is provided between the first pipeline separator (3) and the low-pressure venting system.

5. A triethylene glycol dehydration device with sulfur-containing tail gas ejector skid according to any one of claims 1-3, characterized in that, It also includes a heat balance ejector tube (6) installed at the output end of the second pipeline separator (4), an inlet pipe is installed between the heat balance ejector tube (6) and the high-pressure natural gas pipeline, and an outlet pipe is installed between the heat balance ejector tube (6) and the low-pressure natural gas pipeline.

6. The triethylene glycol dehydration device sulfur-containing tail gas ejector skid according to claim 4, characterized in that, It also includes a heat balance ejector tube (6) installed at the output end of the second pipeline separator (4), an inlet pipe is installed between the heat balance ejector tube (6) and the high-pressure natural gas pipeline, and an outlet pipe is installed between the heat balance ejector tube (6) and the low-pressure natural gas pipeline.

7. The triethylene glycol dehydration device sulfur-containing tail gas ejector skid according to claim 5, characterized in that, An air supply pipe is provided on the air outlet pipe, which is connected to the second pipeline separator (4), and a second switch valve (9) is provided on the air supply pipe.

8. The triethylene glycol dehydration device sulfur-containing tail gas ejector skid according to claim 6, characterized in that, An air supply pipe is provided on the air outlet pipe, which is connected to the second pipeline separator (4), and a second switch valve (9) is provided on the air supply pipe.

9. A triethylene glycol dehydration device for sulfur-containing tail gas ejector treatment skid according to claim 7 or 8, characterized in that, The gas supply pipe is connected to the low-pressure venting system, and a third switch valve (10) is installed between the gas supply pipe and the low-pressure venting system.

10. A triethylene glycol dehydration device sulfur-containing tail gas ejector skid according to claim 6, 7 or 8, characterized in that, It also includes a sewage tank (7) that is connected to both the first pipeline separator (3) and the second pipeline separator (4). A fourth switch valve (11) is provided between the first pipeline separator (3) and the sewage tank (7), and a fifth switch valve (12) is provided between the second pipeline separator (4) and the sewage tank (7).

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