Desulfurization purification system for wellhead gas dehydration regeneration gas

Abstract

The utility model discloses a desulfurization purification system for wellhead gas dehydration regeneration gas, which is characterized in that a gas outlet of a wellhead gas output pipe of the system is connected to a gas inlet of a pre-filter, and a gas outlet of the pre-filter is connected to a feed gas inlet of a molecular sieve adsorber group; one path of a dry gas outlet of the molecular sieve adsorber group is connected to a gas inlet of the desulfurization equipment, and the other path of the dry gas outlet of the molecular sieve adsorber group is connected to a gas inlet of the post-filter; a gas outlet of the desulfurization equipment is connected to a gas inlet of the circulating fan, a gas outlet of the circulating fan is connected to a gas inlet of the heater, a gas outlet of the heater is connected to a regenerated gas inlet of the molecular sieve adsorber group, and a regenerated gas outlet of the molecular sieve adsorber group is connected to a gas inlet of the cooling fan; and a gas outlet of the cooling fan is connected to a gas inlet of the gas-liquid separator. The problem that in the prior art, equipment is corroded due to the fact that sulfur-containing and water-containing regenerated gas is adopted for regenerating the molecular sieve is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of wellhead gas purification, and specifically relates to a desulfurization purification system for wellhead gas dehydration regeneration gas. Background Art

[0002] The solubility of water in wellhead gas decreases with increasing pressure or decreasing temperature. Therefore, when compressing or cooling natural gas, special attention should be paid to its water content. The presence of liquid water is very harmful to processing equipment and gas pipelines. Liquid water mixed with CO2 or hydrogen sulfide will generate corrosive acid. The higher the acid gas content in natural gas, the stronger the corrosiveness. Hydrogen sulfide not only causes common electrochemical corrosion, but also dissolves in water to generate HS-, which can accelerate the release of hydrogen at the cathode. HS- can also prevent atomic hydrogen from combining into molecular hydrogen, which causes a large number of hydrogen ions to gather on the surface of steel, resulting in hydrogen bubbling, hydrogen embrittlement and sulfide stress corrosion cracking of steel. Pipelines need to use expensive special alloy steel, but if the natural gas does not contain free water, ordinary carbon steel can be used to greatly save costs.

[0003] The common dehydration method is to use molecular sieve to dehydrate wellhead gas. The molecular sieve has limited adsorption capacity for water molecules and needs to be regenerated after adsorption saturation. The general process uses heated natural gas for regeneration. The regenerated gas generally extracts a small amount of gas before or after dehydration and heats it to regenerate the molecular sieve. However, the wellhead gas containing sulfur and water will corrode the equipment more after heating, which affects the service life of the system equipment. Utility Model Content

[0004] The embodiment of the present application solves the problem in the prior art that using sulfur-containing and water-containing regeneration gas to regenerate molecular sieves will corrode equipment by providing a desulfurization purification system for wellhead gas dehydration regeneration gas.

[0005] In order to achieve the above-mentioned purpose, the embodiment of the utility model provides a desulfurization purification system for wellhead gas dehydration regeneration gas, including a pre-filter, a molecular sieve adsorber group, a desulfurization device, a circulating fan, a heater, a cooling fan, a gas-liquid separator and a post-filter;

[0006] The gas outlet of the wellhead gas output pipe is connected to the gas inlet of the pre-filter, the gas outlet of the pre-filter is connected to the feed gas inlet of the molecular sieve adsorber group, one way of the dry gas outlet of the molecular sieve adsorber group is connected to the gas inlet of the desulfurization equipment, and the other way of the dry gas outlet of the molecular sieve adsorber group is connected to the gas inlet of the post-filter;

[0007] The air outlet of the desulfurization equipment is connected to the air inlet of the circulation fan, the air outlet of the circulation fan is connected to the air inlet of the heater, the air outlet of the heater is connected to the regeneration gas inlet of the molecular sieve adsorber group, the regeneration gas outlet of the molecular sieve adsorber group is connected to the air inlet of the cooling fan, the air outlet of the cooling fan is connected to the air inlet of the gas-liquid separator, and the air outlet of the gas-liquid separator is connected to the air inlet of the pre-filter.

[0008] In a possible implementation, the desulfurization device includes an adsorption tank, an adsorption filter element, and a mounting plate;

[0009] An air inlet is arranged on the side wall of the lower part of the adsorption tank, an air outlet is arranged on the top of the adsorption tank, a mounting plate is arranged on the upper part of the adsorption tank, and a mounting hole is arranged on the mounting plate;

[0010] The adsorption filter element is a cylindrical structure with an opening at the upper end. The side wall and the bottom wall of the adsorption filter element are provided with filter elements. The upper end of the adsorption filter element is installed at the installation hole of the installation plate.

[0011] In a possible implementation, there are multiple adsorption filter elements, and the multiple adsorption filter elements are evenly distributed on the mounting plate, and the adsorption filter elements and the mounting plate are detachably connected.

[0012] In a possible implementation, the adsorption filter element adopts a polyacrylonitrile activated carbon fiber filter element.

[0013] In a possible implementation, manual ball valves are provided at both the air inlet and the air outlet of the desulfurization equipment.

[0014] In a possible implementation, both the circulating fan and the desulfurization equipment are connected in parallel with a manual ball valve.

[0015] In a possible implementation, the molecular sieve adsorber group includes a molecular sieve adsorber A and a molecular sieve adsorber B arranged in parallel;

[0016] Solenoid valves are provided at the raw gas inlet, dry gas outlet, regeneration gas inlet and regeneration gas outlet of the molecular sieve adsorber A and the molecular sieve adsorber B.

[0017] In a possible implementation, the liquid outlet of the gas-liquid separator is connected to the liquid inlet of the liquid storage tank, and the sewage outlet of the liquid storage tank is connected to the sewage pipeline.

[0018] In a possible implementation, a manual ball valve is provided at the liquid outlet of the gas-liquid separator, and a check valve is provided at the gas outlet of the gas-liquid separator.

[0019] In a possible implementation, a solenoid valve is provided at the drain outlet of the liquid storage tank.

[0020] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:

[0021] The embodiment of the utility model provides a desulfurization and purification system for wellhead gas dehydration regeneration gas. The utility model desulfurizes the regeneration gas through the desulfurization equipment, thereby alleviating equipment corrosion, effectively protecting the heater, circulating fan, cooling fan and molecular sieve adsorber group, and avoiding the problem that the wellhead gas or coalbed methane containing sulfur and water will aggravate the corrosion of the equipment after heating, thereby affecting the service life of the system equipment. The utility model only desulfurizes the regeneration gas, rather than all the wellhead gas, so it can reduce the use time of the desulfurization equipment, thereby increasing the service life of the desulfurization equipment. The utility model can solve the problems of the prior art by simply modifying the original system, so the modification cost is low, the practicability is strong, and it is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic structural diagram of a desulfurization and purification system for wellhead gas dehydration regeneration gas provided in an embodiment of the utility model.

[0024] Figure 2 A schematic structural diagram of a desulfurization device provided in an embodiment of the utility model.

[0025] Figure numerals: 1-pre-filter; 2-molecular sieve adsorber group; 21-molecular sieve adsorber A; 22-molecular sieve adsorber B; 3-desulfurization equipment; 31-adsorption tank; 32-adsorption filter element; 33-mounting plate; 4-post-filter; 5-circulation fan; 6-heater; 7-cooling fan; 8-gas-liquid separator; 9-drainage pipeline; 10-liquid storage tank; 11-check valve; 12-water dew point online monitoring device. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In the description of the embodiments of the present utility model, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present utility model. The terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to the specific circumstances.

[0028] like Figure 1 and Figure 2 As shown, the desulfurization purification system for wellhead gas dehydration regeneration gas provided by the embodiment of the utility model includes a pre-filter 1, a molecular sieve adsorber group 2, a desulfurization device 3, a circulating fan 5, a heater 6, a cooling fan 7, a gas-liquid separator 8 and a post-filter 4.

[0029] The gas outlet of the wellhead gas output pipe is connected to the gas inlet of the pre-filter 1, the gas outlet of the pre-filter 1 is connected to the raw gas inlet of the molecular sieve adsorber group 2, one way of the dry gas outlet of the molecular sieve adsorber group 2 is connected to the gas inlet of the desulfurization equipment 3, and the other way of the dry gas outlet of the molecular sieve adsorber group 2 is connected to the gas inlet of the post-filter 4.

[0030] The air outlet of the desulfurization equipment 3 is connected to the air inlet of the circulation fan 5, the air outlet of the circulation fan 5 is connected to the air inlet of the heater 6, the air outlet of the heater 6 is connected to the regeneration gas inlet of the molecular sieve adsorber group 2, the regeneration gas outlet of the molecular sieve adsorber group 2 is connected to the air inlet of the cooling fan 7, the air outlet of the cooling fan 7 is connected to the air inlet of the gas-liquid separator 8, and the air outlet of the gas-liquid separator 8 is connected to the air inlet of the pre-filter 1.

[0031] It should be noted that the heater 6 adopts an electric heater, and the pre-filter 1 performs preliminary filtration on the wellhead gas output from the wellhead gas output pipe. The pre-filter 1 filters out the liquid in the wellhead gas, including water, light hydrocarbons, etc., and also filters dust and impurities in the pipeline and mechanical equipment to protect the molecular sieve adsorber group 2. The filtered wellhead gas enters the molecular sieve adsorber group 2 for dehydration and drying. The dried wellhead gas is filtered again by the post-filter 4 and enters the next process section. The sewage outlets of the pre-filter 1 and the post-filter 4 are both connected to the sewage pipeline 9, and the post-filter 4 filters out the powdered particles of the molecular sieve adsorber group 2. A water dew point online monitoring device 12 is provided at the gas outlet of the post-filter 4, and the water dew point online monitoring device 12 can detect the water content in the gas.

[0032] The dried wellhead gas can also be sent to the desulfurization equipment 3 for desulfurization. The desulfurized wellhead gas enters the heater 6 for heating under the action of the circulating fan 5. The heated wellhead gas becomes the regeneration gas of the molecular sieve adsorber group 2. After the regeneration gas is sent to the molecular sieve adsorber group 2 for regeneration, the regeneration gas is sent to the cooling fan 7 for cooling. The cooled regeneration gas is sent to the gas-liquid separator 8. The gas-liquid separator 8 performs gas-liquid separation. The separated gas is sent to the molecular sieve adsorber group 2 through the pre-filter 1 to enter the adsorption process again.

[0033] The utility model desulfurizes the regenerated gas through the desulfurization equipment 3, thereby alleviating equipment corrosion, effectively protecting the heater 6, the circulating fan 5, the cooling fan 7 and the molecular sieve adsorber group 2, and avoiding the problem that the wellhead gas or coalbed methane containing sulfur and water will aggravate the corrosion of the equipment after heating, thereby affecting the service life of the system equipment. The utility model only desulfurizes the regenerated gas, not all the wellhead gas, so it can reduce the service life of the desulfurization equipment 3, thereby increasing the service life of the desulfurization equipment 3. The utility model can solve the existing technical problems by simply modifying the original system, so the modification cost is low, the practicability is strong, and it is easy to promote and use.

[0034] In this embodiment, the desulfurization equipment 3 includes an adsorption tank 31 , an adsorption filter element 32 and a mounting plate 33 .

[0035] An air inlet is provided on the side wall of the lower part of the adsorption tank 31 , an air outlet is provided on the top of the adsorption tank 31 , a mounting plate 33 is provided at the upper part of the adsorption tank 31 , and a mounting hole is provided on the mounting plate 33 .

[0036] The adsorption filter element 32 is a cylindrical structure with an opening at the upper end. The side walls and the bottom wall of the adsorption filter element 32 are provided with filter elements. The upper end of the adsorption filter element 32 is mounted at the mounting hole of the mounting plate 33 .

[0037] It should be noted that the wellhead gas enters the lower part of the adsorption tank 31 from the air inlet, is filtered by the adsorption filter element 32, and is output from the air outlet of the adsorption tank 31. The mounting plate 33 serves to install the adsorption filter element 32 and isolate the upper and lower spaces in the adsorption tank 31.

[0038] In this embodiment, there are multiple adsorption filter elements 32, and the multiple adsorption filter elements 32 are evenly distributed on the mounting plate 33. The adsorption filter element 32 and the mounting plate 33 are detachably connected.

[0039] It should be noted that the multiple adsorption filter elements 32 have good use effects, and the adsorption filter elements 32 are detachably connected, so they are easy to disassemble for maintenance or replacement.

[0040] In this embodiment, the adsorption filter element 32 is a polyacrylonitrile activated carbon fiber filter element.

[0041] It should be noted that the polyacrylonitrile activated carbon fiber filter element has a good selective adsorption effect on sulfur-containing compounds. The polyacrylonitrile activated carbon fiber filter element can be regenerated for a second time and can therefore be reused.

[0042] In this embodiment, manual ball valves are provided at the air inlet and the air outlet of the desulfurization device 3, so as to facilitate cutting out the desulfurization device 3 and maintaining or replacing its adsorption filter element 32.

[0043] In this embodiment, the circulating fan 5 and the desulfurization equipment 3 are both connected in parallel with manual ball valves.

[0044] It should be noted that after the desulfurization equipment 3 is cut out, the manual ball valve connected in parallel is opened to ensure that the dried wellhead gas can be normally sent to the heater 6 for heating under the action of the circulating fan 5, so that the regeneration process of the molecular sieve adsorber group 2 proceeds smoothly.

[0045] When the circulating fan 5 is started or reversed, the manual ball valve connected in parallel is opened to allow part of the air flow to pass through the manual ball valve. The manual ball valve serves the purpose of regulating the air volume of the circulating fan 5. After the system is stable, the manual ball valve is closed. By setting the manual ball valve, the circulating fan 5 can be protected.

[0046] In this embodiment, the molecular sieve adsorber group 2 includes a molecular sieve adsorber A21 and a molecular sieve adsorber B22 which are arranged in parallel.

[0047] Solenoid valves are provided at the raw gas inlet, dry gas outlet, regeneration gas inlet and regeneration gas outlet of the molecular sieve adsorber A21 and the molecular sieve adsorber B22.

[0048] It should be noted that by setting up a solenoid valve, the system can switch between the molecular sieve adsorber A21 and the molecular sieve adsorber B22, and it is also convenient to switch the states of the molecular sieve adsorber A21 and the molecular sieve adsorber B22, that is, to select one of the molecular sieve adsorber A21 and the molecular sieve adsorber B22 to be in a dry adsorption state and the other to be in a regeneration state.

[0049] In this embodiment, the liquid outlet of the gas-liquid separator 8 is connected to the liquid inlet of the liquid storage tank 10 , and the sewage outlet of the liquid storage tank 10 is connected to the sewage pipeline 9 .

[0050] It should be noted that the liquid separated by the gas-liquid separator 8 enters the liquid removal tank, and the liquid collected in the liquid removal tank is regularly discharged to the sewage pipeline 9.

[0051] In this embodiment, a manual ball valve is provided at the liquid outlet of the gas-liquid separator 8, and a check valve 11 is provided at the gas outlet of the gas-liquid separator 8, and the check valve 11 prevents the gas from flowing back.

[0052] In this embodiment, a solenoid valve is provided at the sewage outlet of the liquid storage tank 10 .

[0053] In this embodiment, it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiment, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiment should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and therefore it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A desulfurization and purification system for wellhead gas dehydration regeneration gas, characterized in that: It comprises a pre-filter (1), a molecular sieve adsorber group (2), a desulfurization device (3), a circulating fan (5), a heater (6), a cooling fan (7), a gas-liquid separator (8) and a post-filter (4); The gas outlet of the wellhead gas output pipe is connected to the gas inlet of the pre-filter (1), the gas outlet of the pre-filter (1) is connected to the raw gas inlet of the molecular sieve adsorber group (2), one path of the dry gas outlet of the molecular sieve adsorber group (2) is connected to the gas inlet of the desulfurization equipment (3), and the other path of the dry gas outlet of the molecular sieve adsorber group (2) is connected to the gas inlet of the post-filter (4); The air outlet of the desulfurization device (3) is connected to the air inlet of the circulation fan (5), the air outlet of the circulation fan (5) is connected to the air inlet of the heater (6), the air outlet of the heater (6) is connected to the regeneration gas inlet of the molecular sieve adsorber group (2), the regeneration gas outlet of the molecular sieve adsorber group (2) is connected to the air inlet of the cooling fan (7), the air outlet of the cooling fan (7) is connected to the air inlet of the gas-liquid separator (8), and the air outlet of the gas-liquid separator (8) is connected to the air inlet of the pre-filter (1).

2. The desulfurization and purification system for wellhead gas dehydration regeneration gas according to claim 1, characterized in that: The desulfurization equipment (3) comprises an adsorption tank (31), an adsorption filter element (32) and a mounting plate (33); An air inlet is provided on the side wall of the lower part of the adsorption tank (31), an air outlet is provided on the top of the adsorption tank (31), a mounting plate (33) is provided at the upper part of the adsorption tank (31), and a mounting hole is provided on the mounting plate (33); The adsorption filter element (32) is a cylindrical structure with an opening at the upper end. The side wall and the bottom wall of the adsorption filter element (32) are provided with filter elements. The upper end of the adsorption filter element (32) is mounted on the mounting hole of the mounting plate (33).

3. The desulfurization and purification system for wellhead gas dehydration regeneration gas according to claim 2, characterized in that: There are multiple adsorption filter elements (32), and the multiple adsorption filter elements (32) are evenly distributed on the mounting plate (33). The adsorption filter elements (32) and the mounting plate (33) are detachably connected.

4. The desulfurization and purification system for wellhead gas dehydration regeneration gas according to claim 2, characterized in that: The adsorption filter element (32) adopts a polyacrylonitrile activated carbon fiber filter element.

5. The desulfurization and purification system for wellhead gas dehydration regeneration gas according to claim 1, characterized in that: Manual ball valves are provided at the air inlet and the air outlet of the desulfurization equipment (3).

6. The desulfurization and purification system for wellhead gas dehydration regeneration gas according to claim 5, characterized in that: The circulating fan (5) and the desulfurization equipment (3) are both connected in parallel with a manual ball valve.

7. The desulfurization and purification system for wellhead gas dehydration regeneration gas according to claim 1, characterized in that: The molecular sieve adsorber group (2) comprises a molecular sieve adsorber A (21) and a molecular sieve adsorber B (22) which are arranged in parallel; Solenoid valves are provided at the raw gas inlet, dry gas outlet, regeneration gas inlet and regeneration gas outlet of the molecular sieve adsorber A (21) and the molecular sieve adsorber B (22).

8. The desulfurization and purification system for wellhead gas dehydration regeneration gas according to claim 1, characterized in that: The liquid outlet of the gas-liquid separator (8) is connected to the liquid inlet of the liquid storage tank (10), and the sewage outlet of the liquid storage tank (10) is connected to the sewage pipeline (9).

9. The desulfurization and purification system for wellhead gas dehydration regeneration gas according to claim 8, characterized in that: A manual ball valve is provided at the liquid outlet of the gas-liquid separator (8), and a check valve (11) is provided at the gas outlet of the gas-liquid separator (8).

10. The desulfurization and purification system for wellhead gas dehydration regeneration gas according to claim 8, characterized in that: A solenoid valve is provided at the sewage outlet of the liquid storage tank (10).

Images