Skid-mounted natural gas deacidification module

Abstract

The utility model discloses a skid-mounted natural gas deacidification module. Comprising an amine absorption tower, an amine liquid flash tank, a first amine mechanical filter, an amine active carbon filter, a second amine mechanical filter, a lean and rich amine liquid heat exchanger, an amine regeneration tower, an amine reflux collection tank, a regeneration tower top condenser, a regeneration tower reflux pump, a lean amine liquid circulating pump, a lean amine liquid cooler, a tower bottom reboiler, a liquid phase recovery pipeline and an amine liquid filter bypass, a first backflow pipeline, a second backflow pipeline and a defoaming agent adding device. The skid-mounted natural gas deacidification module is additionally provided with the liquid phase recovery pipeline, the amine liquid filter bypass, the first reflux pipeline, the second reflux pipeline and the defoaming agent adding device, so that a process system can run more reliably, the energy consumption is reduced, and the equipment and operation cost is reduced; the process skid of the skid-mounted natural gas deacidification module is reasonably arranged, the device is highly integrated, the space of the skid is saved, the operation is convenient, the transportation and the installation are convenient, and the equipment cost is saved.

Description

Technical Field

[0001] This utility model relates to the field of natural gas liquefaction equipment, specifically to a skid-mounted natural gas deacidification module before natural gas liquefaction. Background Technology

[0002] The natural gas liquefaction unit includes: a natural gas dehydration and mercury removal module, a natural gas deacidification module, and a natural gas refrigeration module. The natural gas dehydration and mercury removal module is used to filter, meter, dehydrate, and remove mercury from the raw gas, which contains impurities. The natural gas deacidification module is used to remove acidic gases such as CO2 and H2S from the raw gas. The natural gas refrigeration module is used to refrigerate the natural gas, liquefying the purified natural gas at room temperature into liquefied natural gas. Traditional natural gas deacidification module processes have poor reliability, are prone to failure, have high energy consumption, and high operating costs. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a skid-mounted natural gas deacidification module with high process system reliability, low energy consumption and reduced equipment cost.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows: a skid-mounted natural gas deacidification module, including: an amine absorption tower, an amine flash tank, a first amine mechanical filter, an amine activated carbon filter, a second amine mechanical filter, a lean and rich amine heat exchanger, an amine regeneration tower, an amine reflux collection tank, a regeneration tower top condenser, a regeneration tower reflux pump, a lean amine circulation pump, a lean amine cooler, and a tower bottom reboiler; the amine absorption tower is equipped with a raw gas inlet, a raw gas outlet, a rich amine outlet, and a lean amine inlet. The raw gas is deacidified by reacting with the amine solution in the amine absorption tower. The rich amine outlet of the amine absorption tower is connected to the solution inlet of the amine flash tank through a pipeline, and the solution outlet of the amine flash tank is connected to the inlet of the first amine mechanical filter through a pipeline. The outlet of the mechanical filter is connected to the inlet of the amine activated carbon filter via a pipeline. The outlet of the amine activated carbon filter is connected to the inlet of the second amine mechanical filter via a pipeline. The outlet of the second amine mechanical filter is connected to the first inlet of the lean-rich amine liquid heat exchanger via a pipeline. The first outlet of the lean-rich amine liquid heat exchanger is connected to the rich amine inlet at the top of the amine regeneration tower via a pipeline. The first inlet and the first outlet are connected. The gas outlet at the top of the amine regeneration tower is also connected to the inlet of the condenser at the top of the regeneration tower via a pipeline. The outlet of the condenser at the top of the regeneration tower is connected to the inlet of the amine reflux collection tank via a pipeline. The outlet of the amine reflux collection tank is connected to the inlet of the regeneration tower reflux pump via a pipeline. The outlet of the regeneration tower reflux pump is connected to the reflux port at the top of the amine regeneration tower via a pipeline. The bottom of the amine regeneration tower is connected to the inlet and outlet of the reboiler via pipelines. The bottom of the amine regeneration tower is also connected to the second inlet of the lean-rich amine heat exchanger via a pipeline. The second outlet of the lean-rich amine heat exchanger is connected to the inlet of the lean amine circulation pump via a pipeline. The second inlet and the second outlet are connected, and the pipeline between the first inlet and outlet can exchange heat with the pipeline between the second inlet and outlet, allowing the rich amine liquid to exchange heat with the lean amine liquid. The outlet of the lean amine circulation pump is connected to the inlet of the lean amine cooler via a pipeline, and the outlet of the lean amine cooler is connected to the lean amine inlet of the amine absorption tower via a pipeline. The tower is characterized by further including a liquid phase recovery pipeline, an amine filter bypass pipeline, a first reflux pipeline with a shut-off valve, a second reflux pipeline with a shut-off valve, and a disinfection system. The defoamer adding device has the following features: the inlet of the liquid phase recovery pipeline is connected to the natural gas dehydration and mercury removal module; the outlet of the liquid phase recovery pipeline is connected to the solution inlet of the amine flash tank via a pipeline; one end of the amine filter bypass is connected to the pipeline at the solution outlet of the amine flash tank; the other end of the amine filter bypass is connected to the pipeline at the outlet of the second amine mechanical filter; one end of the first reflux pipeline is connected to the bottom of the amine reflux collection tank; the other end of the first reflux pipeline is connected to the pipeline at the outlet of the regeneration tower reflux pump; one end of the second reflux pipeline is connected to the pipeline at the outlet of the lean amine circulation pump; the other end of the second reflux pipeline is connected to the pipeline at the solution inlet of the amine flash tank; and the defoamer adding device is connected to the pipeline at the inlet of the lean amine circulation pump.

[0005] Furthermore, in the aforementioned skid-mounted natural gas deacidification module, the amine regeneration tower is configured with a coarse lower section and a fine upper section.

[0006] Furthermore, in the aforementioned skid-mounted natural gas deacidification module, an amine flow meter is connected in series on the pipeline between the lean amine liquid circulation pump and the lean amine liquid cooler.

[0007] Furthermore, in the aforementioned skid-mounted natural gas deacidification module, the amine absorption tower, amine regeneration tower, amine flash tank, first amine mechanical filter, amine activated carbon filter, second amine mechanical filter, lean and rich amine heat exchanger, amine reflux collection tank, regeneration tower reflux pump, lean amine circulating pump, tower bottom reboiler, regeneration tower top condenser, and lean amine cooler are integrated onto a single skid.

[0008] Furthermore, in the aforementioned skid-mounted natural gas deacidification module: the skid is an L-shaped steel frame structure, divided into upper and lower layers. All equipment and pipelines are placed on the same skid base. The amine absorption tower and amine regeneration tower are placed side by side at the front of the skid, each divided into upper and lower sections. The lower sections of both the amine absorption tower and the amine regeneration tower are fixed to the lower layer of the skid. Behind the lower section of the amine absorption tower, on one side of the lower layer of the skid, from front to back, are arranged a first amine liquid mechanical filter, an amine liquid activated carbon filter, and a second amine liquid mechanical filter. Behind the lower section of the amine regeneration tower... The lower layer of the skid is arranged from front to back with an amine flash tank and a lean-rich amine heat exchanger. A bottom reboiler is arranged on one side of the lower layer of the skid behind the lower section of the amine regeneration tower. Two lean amine circulation pumps are arranged behind the lean-rich amine heat exchanger. Two regeneration tower reflux pumps are arranged on one side of the amine regeneration tower behind the lean amine circulation pumps. An amine reflux collection tank is arranged on one side of the amine absorption tower behind the lean amine circulation pumps. The upper layer of the skid is arranged from front to back with the upper section of the amine absorption tower, the upper section of the amine regeneration tower, the top condenser of the regeneration tower, and the lean amine cooler.

[0009] Furthermore, in the aforementioned skid-mounted natural gas deacidification module, the bottom reboiler is a kettle-type reboiler, which is arranged in a raised manner within the lower steel structure frame of the skid. The gas phase space of the bottom reboiler is set at a height higher than the liquid level at the bottom of the amine regeneration tower, and the gas phase outlet of the bottom reboiler is set at a height lower than the gas phase inlet of the amine regeneration tower.

[0010] The advantages of this utility model are as follows: the skid-mounted natural gas deacidification module, due to the addition of a liquid phase recovery pipeline, an amine liquid filter bypass, a first reflux pipeline, a second reflux pipeline, and an antifoaming agent loading device, enables the process system to operate more reliably, reduces energy consumption, and lowers equipment and operating costs; the process skids of the skid-mounted natural gas deacidification module have been rationally laid out, the device is highly integrated, saves skid space, is convenient to operate, easy to transport and install, and saves equipment costs. Attached Figure Description

[0011] Figure 1This is a schematic diagram of the process flow of the skid-mounted natural gas deacidification module described in this utility model.

[0012] Figure 2 This is a three-dimensional structural diagram of the skid-mounted natural gas deacidification module described in this utility model. Detailed Implementation

[0013] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0014] like Figure 1 , Figure 2As shown, the skid-mounted natural gas deacidification module includes: amine absorption tower 1, amine flash tank 2, first amine mechanical filter 3, amine activated carbon filter 4, second amine mechanical filter 13, lean and rich amine heat exchanger 5, amine regeneration tower 6, amine reflux collection tank 8, regeneration tower top condenser 7, regeneration tower reflux pump 9, lean amine circulating pump 11, lean amine cooler 12, and tower bottom reboiler 10.The amine absorption tower 1 is equipped with a raw gas inlet, a raw gas outlet, a rich amine solution outlet, and a lean amine solution inlet. The raw gas undergoes deacidification by reacting with the amine solution in the amine absorption tower 1. The rich amine solution outlet of the amine absorption tower 1 is connected to the solution inlet of the amine flash tank 2 via a pipeline. The solution outlet of the amine flash tank 2 is connected to the inlet of the first amine mechanical filter 3 via a pipeline. The outlet of the first amine mechanical filter 3 is connected to the inlet of the amine activated carbon filter 4 via a pipeline. The outlet of the amine activated carbon filter 4 is connected to the inlet of the second amine mechanical filter 13 via a pipeline. The outlet of the second amine mechanical filter 13 is connected to the first inlet of the lean-rich amine solution heat exchanger 5 via a pipeline. The first outlet of the lean-rich amine solution heat exchanger 5 is connected to the first inlet of the second amine mechanical filter 13 via a pipeline. The gas outlet at the top of amine regeneration tower 6 is connected to the rich amine inlet, and the first inlet and first outlet are connected. The gas outlet at the top of amine regeneration tower 6 is also connected to the inlet of the top condenser 7 via a pipeline. The outlet of the top condenser 7 is connected to the inlet of the amine reflux collection tank 8 via a pipeline. The outlet of the amine reflux collection tank 8 is connected to the inlet of the regeneration tower reflux pump 9 via a pipeline. The outlet of the regeneration tower reflux pump 9 is connected to the reflux port at the top of amine regeneration tower 6 via a pipeline. The bottom of amine regeneration tower 6 is connected to the inlet and outlet of the bottom reboiler 10 via pipelines. The bottom of amine regeneration tower 6 is also connected to the second inlet of the lean-rich amine liquid heat exchanger 5 via a pipeline. The second outlet of the lean-rich amine liquid heat exchanger 5 is connected to the lean amine liquid... The inlet of the circulating pump 11 is connected to the second inlet and the second outlet. The pipeline between the first inlet and the outlet can exchange heat with the pipeline between the second inlet and the outlet, allowing the rich amine liquid to exchange heat with the lean amine liquid. The outlet of the lean amine liquid circulating pump 11 is connected to the inlet of the lean amine liquid cooler 12 through a pipeline. The outlet of the lean amine liquid cooler 12 is connected to the lean amine liquid inlet of the amine absorption tower 1 through a pipeline. A liquid phase recovery pipeline 20, an amine liquid filter bypass pipeline 15, a first reflux pipeline 17 with a shut-off valve, a second reflux pipeline 16 with a shut-off valve, and an antifoaming agent adding device 14 are also provided. The inlet of the liquid phase recovery pipeline 20 is used to connect to the natural gas dehydration and mercury removal module, and the outlet of the liquid phase recovery pipeline 20... The system is connected to the solution inlet of the amine flash tank 2 via a pipeline; one end of the amine filter bypass 15 is connected to the pipeline at the solution outlet of the amine flash tank 2; the other end of the amine filter bypass 15 is connected to the pipeline at the outlet of the second amine mechanical filter 13; one end of the first reflux pipeline 17 is connected to the bottom of the amine reflux collection tank 8; the other end of the first reflux pipeline 17 is connected to the pipeline at the outlet of the regeneration tower reflux pump 9; one end of the second reflux pipeline 16 is connected to the pipeline at the outlet of the lean amine circulating pump 11; the other end of the second reflux pipeline 16 is connected to the pipeline at the solution inlet of the amine flash tank 2; and the defoamer adding device 14 is connected to the pipeline at the inlet of the lean amine circulating pump 11. Figure 1 In this context, NG represents natural gas feedstock, RA represents amine-rich liquid, and LA represents amine-lean liquid.

[0015] During operation, the raw gas enters the bottom of the amine absorption tower 1, which is a structured packed absorption tower. The raw gas flows upward and reacts directly with the amine solution flowing downward inside the tower to remove acid. After deacidification, the raw gas exits from the top of the amine absorption tower 1. The amine solution reacts to become a rich amine liquid, which accumulates at the bottom of the amine absorption tower 1. When the rich amine liquid accumulates to a certain level, a level regulating valve at the bottom of the amine absorption tower 1 will open, allowing the rich amine liquid to leave the amine absorption tower 1. The pressure of the rich amine liquid decreases as it passes through the level regulating valve, and then the rich amine liquid enters the amine flash evaporator 2 to flash out the entrained gas. Next, the rich amine liquid sequentially enters the first amine mechanical filter 3, the amine activated carbon filter 4, and the second amine mechanical filter 13 for filtration. After filtration, the rich amine liquid enters the lean amine heat exchanger 5 to exchange heat with the higher-temperature lean amine liquid, thereby being heated to about 96°C before entering the amine regeneration tower 6. The rich amine liquid is mainly heated at high temperature by the reboiler 10 at the bottom of the tower to release acid gas. The desorbed acid gas and the rich amine liquid entering the amine regeneration tower 6 undergo mass transfer through the packing material inside the tower, allowing more acid gas to be desorbed from the amine liquid. The separated acid gas, carrying a small amount of amine liquid, flows out from the top of the tower and enters the top condenser 7 of the regeneration tower for cooling. The condensed amine liquid flows into the amine reflux collection tank 8, while the acid gas is treated and discharged into the atmosphere. The amine liquid collected in the amine reflux collection tank 8 is sent back to the top of the amine regeneration tower 6 by the regeneration tower reflux pump 9. The rich amine liquid enters the amine regeneration tower 6 from the top and descends inside the tower. The acid gas desorbed at high temperature in the reboiler 10 at the bottom of the tower rises through a pipe into the amine regeneration tower 6. The rising acid gas and the descending rich amine liquid are thoroughly mixed and contacted through the packing material inside the tower, allowing more acid gas to be desorbed from the amine liquid. The rich amine liquid inside the amine regeneration tower 6 enters the reboiler 10 at the bottom of the tower through a pipe for heating, with heat transfer oil as the heat source. The acid gas desorbed at high temperature in the reboiler 10 at the bottom of the tower enters the amine regeneration tower 6 through the pipeline and rises. The rich amine liquid that desorbs the acid gas becomes the lean amine liquid. The lean amine liquid enters the bottom of the amine regeneration tower 6 through the pipeline. Under the action of the lean amine liquid circulation pump 11, the hot lean amine liquid at the bottom of the amine regeneration tower 6 will enter the lean-rich amine liquid heat exchanger 5 to exchange heat with the lower temperature rich amine liquid, thereby being cooled down. After being cooled down, the lean amine liquid is pressurized to about 4.5 MPa by the lean amine liquid circulation pump 11, and then cooled by the lean amine liquid cooler 12 before returning to the amine absorption tower 1.

[0016] In this embodiment, the amine regeneration tower 6 is designed with a coarser lower section and a thinner upper section. This design increases the storage capacity of the amine solution, preventing the lean amine solution circulation pump 11 from quickly emptying the amine solution in the amine regeneration tower 6. It also eliminates the need for a separate amine buffer tank, resulting in a high degree of integration for the amine regeneration tower 6. An amine flow meter 21 is connected in series on the pipeline between the lean amine solution circulation pump 11 and the lean amine solution cooler 12.

[0017] After the liquid phase recovery pipeline 20 is set up, the liquid phase separated from the natural gas by the natural gas dehydration and mercury removal module can be returned to the amine flash tank 2. Through water recovery, the amount of amine liquid replenishment is reduced, thus saving water resources.

[0018] After setting up bypass 15 for the amine liquid filter, the filter element and activated carbon can be replaced online in the event of amine liquid filter blockage, without affecting the production operation of the unit.

[0019] Two units are installed for both the regeneration tower reflux pump 9 and the lean amine liquid circulation pump 11, one for operation and one for standby, to avoid affecting the operation of the unit due to pump failure. The regeneration tower reflux pump 9 is equipped with a first reflux pipeline 17, and the lean amine liquid circulation pump 11 is equipped with a second reflux pipeline 16, which facilitates the start-up of the pump for internal circulation of amine liquid, while avoiding frequent pump start-up and shutdown due to excessive pump circulation volume.

[0020] A defoamer injection device is installed at the inlet pipe of the lean amine circulating pump 11. Amine degradation products, suspended solid particles in the solution, and free liquids (hydrocarbons) carried in the raw natural gas can all easily cause foaming in the amine solution, thus worsening the deacidification effect of the amine absorption tower and even leading to shutdown. Installing a defoamer injection device at the inlet pipe of the lean amine circulating pump 11 can prevent foaming of the amine solution.

[0021] The regeneration tower top condenser 7 can be a shell-and-tube heat exchanger, using cooling water to cool the top evaporating gas. Alternatively, it can be an air cooler, using air cooling to cool the top evaporating gas.

[0022] The lean amine liquid cooler 12 can be a shell-and-tube heat exchanger, using cooling water to cool the lean amine liquid. Alternatively, it can be an air cooler, using air to cool the lean amine liquid.

[0023] The skid-mounted natural gas desulfurization module can remove carbon dioxide from natural gas to below 0.01% (mole fraction) and hydrogen sulfide to 3.5 mg / Nm³. 3 The total sulfur content (calculated as sulfur) is reduced to 20 mg / Nm³. 3 The following meets the requirements for natural gas liquefaction and also meets the specifications for commercial LNG.

[0024] The amine absorption tower 1, amine regeneration tower 6, amine flash tank 2, first amine mechanical filter 3, amine activated carbon filter 4, second amine mechanical filter 13, lean and rich amine heat exchanger 5, amine reflux collection tank 8, regeneration tower reflux pump 9, lean amine circulating pump 11, tower bottom reboiler 10, regeneration tower top condenser 7, and lean amine cooler 12 are integrated on a single skid.

[0025] The skid has an L-shaped steel frame structure, consisting of upper and lower layers. All equipment and piping are mounted on the same skid base. The amine absorption tower 1 and amine regeneration tower 6 are positioned side-by-side at the front of the skid, each divided into upper and lower sections. The lower sections of both the amine absorption tower 1 and amine regeneration tower 6 are fixed to the lower layer of the skid. On one side of the lower layer of the skid behind the lower section of the amine absorption tower 1, from front to back, are arranged a first amine liquid mechanical filter 3, an amine liquid activated carbon filter 4, and a second amine liquid mechanical filter 13. In the middle of the lower layer of the skid behind the lower section of the amine regeneration tower 6, from front to back, are arranged amine... The skid consists of a liquid flash tank 2, a lean-rich amine heat exchanger 5, and a bottom reboiler 10 located on one side of the lower layer of the skid behind the lower section of the amine regeneration tower 6. Behind the lean-rich amine heat exchanger 5, there are two lean amine circulating pumps 11. Behind the lean amine circulating pumps 11, on one side of the amine regeneration tower 6, there are two regeneration tower reflux pumps 9. Behind the lean amine circulating pumps 11, on one side of the amine absorption tower 1, there is an amine reflux collection tank 8. The upper layer of the skid consists of the upper section of the amine absorption tower 1 and the upper section of the amine regeneration tower 6, the top condenser 7 of the regeneration tower, and the lean amine cooler 12, arranged sequentially from front to back.

[0026] The bottom reboiler 10 is a kettle-type reboiler, which is arranged in a raised manner within the steel structure frame under the skid. The gas phase space of the bottom reboiler 10 is set at a height higher than the bottom liquid level of the amine regeneration tower 6, and the gas phase outlet of the bottom reboiler 10 is set at a height lower than the gas phase inlet of the amine regeneration tower 6, thereby ensuring the requirements for heating amine liquid regeneration.

[0027] The process equipment is arranged in two layers, making full use of the space inside the skid and ensuring that the skid is as small as possible. The amine absorption tower 1 and amine regeneration tower 6 at the front of the skid are designed in two sections: the lower section is placed side-by-side within the lower steel structure frame, and the upper section is placed side-by-side within the upper vertical steel structure frame. The upper and lower sections of amine absorption tower 1 and amine regeneration tower 6 are connected by flanges, and the upper vertical steel structure frame is fixed to the lower steel structure frame with several bolts. This facilitates disassembly, assembly, and transportation.

[0028] The manholes of the skid-mounted amine activated carbon filter 4 and amine reflux collection tank 8 are located on the side of the skid and face outwards, which facilitates the loading and unloading of packing materials and internal inspection of the equipment.

[0029] The regeneration tower top condenser 7 and the amine reflux collection tank 8 are arranged vertically to ensure that the gas and liquid phases cooled by the regeneration tower top condenser 7 can flow from top to bottom into the amine reflux collection tank 8, thus avoiding the accumulation of liquid.

Claims

1. A skid-mounted natural gas deacidification module comprising: The amine absorption tower, the amine liquid flash tank, the first amine mechanical filter, the amine activated carbon filter, the second amine mechanical filter, the lean and rich amine liquid heat exchanger, the amine regeneration tower, the amine reflux collection tank, the regeneration tower top condenser, the regeneration tower reflux pump, the lean amine liquid circulating pump, the lean amine liquid cooler and the tower bottom reboiler are arranged in sequence, and the amine absorption tower is provided with a raw material gas inlet, a raw material gas outlet, a rich amine liquid outlet and a lean amine liquid inlet; the raw material gas is deacidified by reacting with the amine solution in the amine absorption tower; the rich amine liquid outlet of the amine absorption tower is connected with the solution inlet of the amine liquid flash tank through a pipeline; the solution outlet of the amine liquid flash tank is connected with the inlet of the first amine mechanical filter through a pipeline; the outlet of the first amine mechanical filter is connected with the inlet of the amine activated carbon filter through a pipeline; the outlet of the amine activated carbon filter is connected with the inlet of the second amine mechanical filter through a pipeline; the outlet of the second amine mechanical filter is connected with the first inlet of the lean and rich amine liquid heat exchanger through a pipeline; the first outlet of the lean and rich amine liquid heat exchanger is connected with the rich amine inlet at the top of the amine regeneration tower through a pipeline; the gas outlet at the top of the amine regeneration tower is also connected with the inlet of the regeneration tower top condenser through a pipeline; the outlet of the regeneration tower top condenser is connected with the inlet of the amine reflux collection tank through a pipeline; the outlet of the amine reflux collection tank is connected with the inlet of the regeneration tower reflux pump through a pipeline; the outlet of the regeneration tower reflux pump is connected with the reflux port at the top of the amine regeneration tower through a pipeline; the tower bottom of the amine regeneration tower is connected with the inlet and outlet of the tower bottom reboiler through pipelines respectively; the tower bottom of the amine regeneration tower is also connected with the second inlet of the lean and rich amine liquid heat exchanger through a pipeline; the second outlet of the lean and rich amine liquid heat exchanger is connected with the inlet of the lean amine liquid circulating pump through a pipeline; the first inlet and the first outlet are connected in communication; the pipeline between the first inlet and the first outlet can exchange heat with the pipeline between the second inlet and the second outlet, so that the rich amine liquid can exchange heat with the lean amine liquid; the outlet of the lean amine liquid circulating pump is connected with the inlet of the lean amine liquid cooler through a pipeline; the outlet of the lean amine liquid cooler is connected with the lean amine liquid inlet of the amine absorption tower through a pipeline; characterized in that: a liquid phase recovery pipeline, an amine liquid filter bypass pipeline, a first reflux pipeline with a stop valve, a second reflux pipeline with a stop valve and a defoaming agent adding device are further arranged; the inlet of the liquid phase recovery pipeline is used for connecting a natural gas dehydration and mercury removal module; the outlet of the liquid phase recovery pipeline is connected with the solution inlet of the amine liquid flash tank through a pipeline; one end of the amine liquid filter bypass pipeline is connected with the pipeline at the solution outlet of the amine liquid flash tank; the other end of the amine liquid filter bypass pipeline is connected with the pipeline at the outlet of the second amine mechanical filter; one end of the first reflux pipeline is connected with the bottom of the amine reflux collection tank in communication; the other end of the first reflux pipeline is connected with the pipeline at the outlet of the regeneration tower reflux pump in communication; one end of the second reflux pipeline is connected with the pipeline at the outlet of the lean amine liquid circulating pump; the other end of the second reflux pipeline is connected with the pipeline at the solution inlet of the amine liquid flash tank; the defoaming agent adding device is connected with the pipeline at the inlet of the lean amine liquid circulating pump.

2. The skid-mounted natural gas deacidification module of claim 1, wherein: The amine regeneration tower is arranged in a structure with a coarse lower part and a fine middle and upper part.

3. The skid-mounted natural gas deacidification module of claim 1, wherein: An amine liquid flowmeter is connected in series on the pipeline between the lean amine liquid circulating pump and the lean amine liquid cooler.

4. A skid-mounted natural gas deacidification module according to claim 1 or 2 or 3, characterized in that: The amine absorption tower, the amine regeneration tower, the amine liquid flash tank, the first amine mechanical filter, the amine activated carbon filter, the second amine mechanical filter, the lean and rich amine liquid heat exchanger, the amine reflux collection tank, the regeneration tower reflux pump, the lean amine liquid circulating pump, the tower bottom reboiler and the lean amine liquid cooler are integrated on a pry block.

5. The skid-mounted natural gas deacidification module of claim 4, wherein: The pry block is an L-shaped steel structure frame structure, and is divided into upper and lower two layers. All the equipment and pipelines are arranged on the same pry seat. The amine absorption tower and the amine regeneration tower are arranged side by side in the front part of the pry block, and are both divided into upper and lower two sections. The lower sections of the amine absorption tower and the amine regeneration tower are fixed to the lower layer of the pry block. The first amine liquid mechanical filter, the amine liquid activated carbon filter and the second amine liquid mechanical filter are arranged in front of the rear side of the lower layer of the pry block. The amine liquid flash tank and the lean and rich amine liquid heat exchanger are arranged in front of the rear side of the middle of the lower layer of the pry block. The tower bottom reboiler is arranged on one side of the rear side of the lower layer of the pry block. Two lean amine liquid circulating pumps are arranged behind the rear side of the lean and rich amine liquid heat exchanger. Two regeneration tower reflux pumps are arranged on one side of the rear side of the lean amine liquid circulating pump and away from the amine regeneration tower. The amine reflux collection tank is arranged on one side of the rear side of the lean amine liquid circulating pump and away from the amine absorption tower. The upper layer of the pry block is sequentially provided with the upper sections of the amine absorption tower and the amine regeneration tower, the regeneration tower top condenser and the lean amine liquid cooler from front to rear.

6. The skid-mounted natural gas deacidification module of claim 5, wherein: The tower bottom reboiler is a kettle type reboiler, which is arranged in a high position in the steel structure frame of the lower layer of the pry block. The gas phase space of the tower bottom reboiler is arranged to be higher than the liquid level of the bottom of the amine regeneration tower. The gas phase outlet of the tower bottom reboiler is arranged to be lower than the gas phase inlet of the amine regeneration tower.

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