A near-zero emission natural gas TSA pilot plant device and a working method thereof

Abstract

A kind of natural gas TSA pilot plant experimental device of near zero emission and its working method belong to natural gas experimental technical field.To solve the problem of waste and environmental pollution of raw gas in TSA pilot test, the raw gas storage tank is connected with adsorption desorption tower, desorption gas cooler and LNG raw gas pipeline respectively;the purified gas outlet at the top of adsorption desorption tower is connected with purified gas mixing tank, purified gas separator and purge gas heater respectively;the purified gas separator is connected with purified gas storage tank, and the purified gas storage tank is connected with purified gas mixing tank, purge gas heater and purified gas heat exchanger respectively;the purified gas heat exchanger is connected with LNG raw gas pipeline;the purge gas heater is connected with desorption gas and purified gas mixing tank;the desorption gas cooler is connected with desorption gas storage tank, and the desorption gas storage tank is connected with desorption gas separator;the desorption gas separator is connected with purified gas mixing tank, and the purified gas mixing tank is connected with desorption gas and purified gas mixed gas compressor.The application realizes zero emission of greenhouse gas.

Description

Technical Field

[0001] This invention belongs to the field of natural gas experimental technology, specifically relating to a near-zero emission natural gas TSA pilot test device and its working method. Background Technology

[0002] Due to the high space requirements of offshore natural gas extraction, dry decarbonization technology for natural gas is receiving increasing attention. In actual natural gas production, most processes require experimental research before being put into production to provide a reference for actual production. After the experiment, the purified gas (CH4) is directly vented or burned, while the desorbed gas is vented, resulting in waste of raw material gas and environmental pollution. Summary of the Invention

[0003] The problem this invention aims to solve is the waste of raw gas and environmental pollution during TSA pilot-scale experiments. It proposes a near-zero emission natural gas TSA pilot-scale experimental device and its operating method.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A near-zero emission natural gas TSA pilot plant includes a feed gas storage tank, a purified gas storage tank, a desorbed gas storage tank, a mixed tank for desorbed and purified gas, and an adsorption-desorption tower.

[0006] The raw material gas storage tank is connected to the adsorption-desorption tower, the desorbed gas cooler, and the LNG raw material gas pipeline via pipelines.

[0007] The purified gas outlet at the top of the adsorption-desorption tower is connected to a purified gas mixing tank, a purified gas separator, and a purge gas heater via pipelines. The purified gas separator is connected to a purified gas storage tank via pipelines. The purified gas storage tank is connected to a purified gas mixing tank, a purge gas heater, and a purified gas heat exchanger via pipelines. The purified gas heat exchanger is connected to an LNG feed gas pipeline.

[0008] The purge gas heater is connected to the desorbed gas and purified gas mixing tank via a pipeline;

[0009] The desorbed gas cooler is connected to the desorbed gas storage tank via a pipeline. The desorbed gas storage tank is connected to the desorbed gas separator via a pipeline. The desorbed gas separator is connected to the purified gas mixing tank via a pipeline. The purified gas mixing tank is connected to the desorbed gas and purified gas mixed gas compressor via a pipeline. The desorbed gas and purified gas mixed gas compressor is connected to the desorbed gas and purified gas mixed gas heater via a pipeline. The desorbed gas and purified gas mixed gas heater is connected to the LNG feed gas pipeline, the natural gas combustion system, and the natural gas storage tank via pipelines, respectively.

[0010] Each pipeline is equipped with a regulating valve.

[0011] Furthermore, pressure and temperature measuring instruments are installed on the raw material gas storage tank, purified gas storage tank, desorbed gas storage tank, desorbed gas and purified gas mixing tank, and adsorption-desorption tower.

[0012] Furthermore, the raw material gas storage tank, the purified gas storage tank, the desorbed gas storage tank, and the desorbed gas and purified gas mixing tank are equipped with sampling ports.

[0013] Furthermore, the desorbed gas and purified gas mixed gas heater is connected downstream of the LNG feed gas pipeline via a pipeline.

[0014] Furthermore, the adsorption-desorption tower has a heating function.

[0015] A method for operating a near-zero emission natural gas TSA pilot plant, based on the aforementioned near-zero emission natural gas TSA pilot plant, includes the following steps when the near-zero emission natural gas TSA pilot plant is used in conjunction with an LNG liquefaction system:

[0016] S1. The feed gas from the LNG feed gas pipeline enters the feed gas storage tank, and then is regulated in conjunction with the regulating valve at the top of the adsorption-desorption tower to ensure that the flow rate of the adsorption-desorption tower is 300-350 m³ / h. 3 The required pressure of 2.0-3.0 MPa per hour is used to purify the air in the adsorption-desorption tower.

[0017] S2. The purified gas from the adsorption-desorption tower obtained in step S1 is depressurized by a regulating valve and then enters the purified gas separator for processing before being introduced into the purified gas storage tank.

[0018] S3. Determine the CO2 content of the purified gas in the purified gas storage tank. When the CO2 content is less than 0.0050%, introduce the purified gas into the purified gas heat exchanger until the temperature reaches 20-25℃, which is similar to the temperature of the LNG pipeline, and then introduce it into the LNG feed gas pipeline. When the CO2 content is equal to 0.0050%, proceed to the next step.

[0019] S4. When the CO2 content of the purified gas in the purified gas storage tank is equal to 0.0050%, close the raw material gas supply side and the purified gas valve at the top of the adsorption-desorption tower. Heat the purified gas in the purified gas storage tank to 280-290℃ through the purge gas heater, and enter the adsorption-desorption tower through the top of the adsorption-desorption tower. Heat the adsorption-desorption tower, and the desorbed gas exits through the bottom of the adsorption-desorption tower. After being cooled by the desorbed gas cooler, it enters the desorbed gas storage tank. Then, after being purified by the desorbed gas separator, it enters the desorbed gas and purified gas mixing tank.

[0020] S5. The gas obtained in step S4 from the desorbed gas and purified gas mixing tank, after being pressurized by the desorbed gas and purified gas mixing compressor and heated by the desorbed gas and purified gas mixing heater, enters the natural gas combustion system as fuel for other equipment, or is introduced into a natural gas storage tank and transported to other locations as fuel for other equipment. The calculation expression for the gas distribution is:

[0021]

[0022] Where C represents the CO2 content of the fuel gas, C S For the CO2 content of purified gas or CH4 gas cylinders, C D For desorption gas or CO2 content in CO2 cylinders, F S To purify the airflow, F D The desorption gas flow rate.

[0023] Furthermore, in step S1, the CO2 content of the LNG feedstock gas in the pipeline is 3-10%, the pressure is 2.0-2.5 MPa, and the temperature is 20-25℃.

[0024] Furthermore, the CO2 content of natural gas used as fuel is no higher than 30%.

[0025] A method for operating a near-zero emission natural gas TSA pilot test device, based on the aforementioned near-zero emission natural gas TSA pilot test device, includes the following steps when the near-zero emission natural gas TSA pilot test device is operated independently:

[0026] Step 1. The feed gas from the LNG feed gas pipeline enters the feed gas storage tank, and then is regulated in conjunction with the regulating valve at the top of the adsorption-desorption tower to ensure that the flow rate of the adsorption-desorption tower is 300-350 m³ / h. 3 The required pressure of 2.0-3.0 MPa per hour is used to purify the air in the adsorption-desorption tower.

[0027] Step 2. The purified gas obtained from the adsorption-desorption tower in Step 1 is depressurized by a regulating valve and then enters the purified gas separator for processing before being introduced into the purified gas storage tank.

[0028] Step 3. Determine the CO2 content of the purified gas in the purified gas storage tank. When the CO2 content of the purified gas in the purified gas storage tank is equal to 0.0050%, close the raw material gas supply side and the purified gas valve at the top of the adsorption-desorption tower. Heat the purified gas in the purified gas storage tank to 280-290℃ through the purge gas heater, and enter the adsorption-desorption tower through the top of the adsorption-desorption tower. Heat the adsorption-desorption tower, and the desorbed gas exits through the bottom of the adsorption-desorption tower. After being cooled by the desorbed gas cooler, it enters the desorbed gas storage tank. Then, after being purified by the desorbed gas separator, it enters the desorbed gas and purified gas mixing tank.

[0029] Step 4. After the adsorbent in the adsorption-desorption tower is completely regenerated, the remaining purified gas in the purified gas storage tank is introduced into the adsorption-desorption tower and mixed with the desorbed gas from the desorbed gas and purified gas mixing tank obtained in Step 3. The mixture is then pressurized by the desorbed gas and purified gas mixing compressor, and then heated by the desorbed gas and purified gas mixing heater before entering the downstream pipeline of the LNG feedstock. The calculation expression for the gas distribution is:

[0030]

[0031] Where C represents the CO2 content of the fuel gas, C S For the CO2 content of purified gas or CH4 gas cylinders, C D For desorption gas or CO2 content in CO2 cylinders, F S To purify the airflow, F D The desorption gas flow rate.

[0032] Furthermore, in step 1, the CO2 content of the LNG feedstock gas in the pipeline is 3-10%, the pressure is 2.0-2.5 MPa, and the temperature is 20-25℃.

[0033] The beneficial effects of this invention are:

[0034] The near-zero emission natural gas TSA pilot-scale experimental apparatus described in this invention utilizes a process where feed gas is drawn from LNG feed gas pipelines and reinjected into purified and desorbed gas pipelines or utilized through combustion. This not only allows for pilot-scale experiments with actual media to verify indoor experimental results and test the effectiveness of the natural gas dry TSA process, but also significantly reduces experimental costs. Furthermore, the near-zero greenhouse gas emissions reduce environmental pollution to zero. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of a near-zero emission natural gas TSA pilot-scale experimental device according to the present invention. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described specific embodiments are merely a part of the embodiments of the invention, and not all of them. The components of the specific embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations, and the invention may also have other embodiments.

[0037] Therefore, the following detailed description of specific embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected specific embodiments of the invention. All other specific embodiments obtained by those skilled in the art based on these specific embodiments without inventive effort are within the scope of protection of this invention.

[0038] To further understand the invention's content, features, and effects, the following specific embodiments are provided, along with accompanying drawings. Figure 1 Detailed explanation is as follows: Specific implementation method one:

[0040] A near-zero emission natural gas TSA pilot plant includes a feed gas storage tank 1, a purified gas storage tank 2, a desorbed gas storage tank 3, a desorbed gas and purified gas mixing tank 4, and an adsorption-desorption tower 5.

[0041] The raw material gas storage tank 1 is connected to the adsorption-desorption tower 5, the desorbed gas cooler 9, and the LNG raw material gas pipeline 13 via pipelines.

[0042] The purified gas outlet at the top of the adsorption-desorption tower 5 is connected to the purified gas mixing tank 4, the purified gas separator 6, and the purge gas heater 8 via pipelines. The purified gas separator 6 is connected to the purified gas storage tank 2 via pipelines. The purified gas storage tank 2 is connected to the purified gas mixing tank 4, the purge gas heater 8, and the purified gas heat exchanger 7 via pipelines. The purified gas heat exchanger is connected to the LNG raw material gas pipeline 13.

[0043] The purge gas heater 8 is connected to the desorption gas and purified gas mixing tank 4 via a pipeline;

[0044] The desorbed gas cooler 9 is connected to the desorbed gas storage tank 3 via a pipeline. The desorbed gas storage tank 3 is connected to the desorbed gas separator 10 via a pipeline. The desorbed gas separator 10 is connected to the purified gas mixing tank 4 via a pipeline. The purified gas mixing tank 4 is connected to the desorbed gas and purified gas mixing compressor 11 via a pipeline. The desorbed gas and purified gas mixing compressor 11 is connected to the desorbed gas and purified gas mixing heater 12 via a pipeline. The desorbed gas and purified gas mixing heater 12 is connected to the LNG feed gas pipeline 13, the natural gas combustion system 15, and the natural gas storage tank 16 via pipelines, respectively.

[0045] Each pipeline is equipped with a regulating valve 17.

[0046] Furthermore, pressure measuring instruments 18 and temperature measuring instruments 19 are installed on the raw material gas storage tank 1, purified gas storage tank 2, desorbed gas storage tank 3, desorbed gas and purified gas mixing tank 4, and adsorption-desorption tower 5.

[0047] Furthermore, sampling ports are provided on the raw material gas storage tank 1, the purified gas storage tank 2, the desorbed gas storage tank 3, and the desorbed gas and purified gas mixing tank 4.

[0048] Furthermore, the desorbed gas and purified gas mixed gas heater 12 is connected downstream of the LNG feed gas pipeline 13 via a pipeline.

[0049] Furthermore, the adsorption-desorption tower 5 has a heating function. Specific Implementation Method Two:

[0051] A method for operating a near-zero emission natural gas TSA pilot plant is based on the near-zero emission natural gas TSA pilot plant described in Specific Embodiment 1. When the near-zero emission natural gas TSA pilot plant is used in conjunction with an LNG liquefaction system, the following steps are included:

[0052] S1. The feed gas from the LNG feed gas pipeline enters the feed gas storage tank, and then is regulated in conjunction with the regulating valve at the top of the adsorption-desorption tower to ensure that the flow rate of the adsorption-desorption tower is 300-350 m³ / h. 3 The required pressure of 2.0-3.0 MPa per hour is used to purify the air in the adsorption-desorption tower.

[0053] Furthermore, in step S1, the CO2 content of the LNG feedstock gas in the pipeline is 3-10%, the pressure is 2.0-2.5 MPa, and the temperature is 20-25℃.

[0054] S2. The purified gas from the adsorption-desorption tower obtained in step S1 is depressurized by a regulating valve and then enters the purified gas separator for processing before being introduced into the purified gas storage tank.

[0055] S3. Determine the CO2 content of the purified gas in the purified gas storage tank. When the CO2 content is less than 0.0050%, introduce the purified gas into the purified gas heat exchanger until the temperature reaches 20-25℃, which is similar to the temperature of the LNG pipeline, and then introduce it into the LNG feed gas pipeline. When the CO2 content is equal to 0.0050%, proceed to the next step.

[0056] S4. When the CO2 content of the purified gas in the purified gas storage tank is equal to 0.0050%, close the raw material gas supply side and the purified gas valve at the top of the adsorption-desorption tower. Heat the purified gas in the purified gas storage tank to 280-290℃ through the purge gas heater, and enter the adsorption-desorption tower through the top of the adsorption-desorption tower. Heat the adsorption-desorption tower, and the desorbed gas exits through the bottom of the adsorption-desorption tower. After being cooled by the desorbed gas cooler, it enters the desorbed gas storage tank. Then, after being purified by the desorbed gas separator, it enters the desorbed gas and purified gas mixing tank.

[0057] S5. The gas obtained in step S4 from the desorbed gas and purified gas mixing tank, after being pressurized by the desorbed gas and purified gas mixing compressor and heated by the desorbed gas and purified gas mixing heater, enters the natural gas combustion system as fuel for other equipment, or is introduced into a natural gas storage tank and transported to other locations as fuel for other equipment. The calculation expression for the gas distribution is:

[0058]

[0059] Where C represents the CO2 content of the fuel gas, C S For the CO2 content of purified gas or CH4 gas cylinders, C D For desorption gas or CO2 content in CO2 cylinders, F S To purify the airflow, F D To reduce the intake air flow rate;

[0060] Furthermore, the CO2 content of natural gas used as fuel is no higher than 30%. Specific implementation method three:

[0062] A method for operating a near-zero emission natural gas TSA pilot test device, based on the near-zero emission natural gas TSA pilot test device described in Specific Embodiment 1, is characterized in that, when the near-zero emission natural gas TSA pilot test device is operated alone, it includes the following steps:

[0063] Step 1. The feed gas from the LNG feed gas pipeline enters the feed gas storage tank, and then is regulated in conjunction with the regulating valve at the top of the adsorption-desorption tower to ensure that the flow rate of the adsorption-desorption tower is 300-350 m³ / h. 3 The required pressure of 2.0-3.0 MPa per hour is used to purify the air in the adsorption-desorption tower.

[0064] Furthermore, in step 1, the CO2 content of the LNG feedstock gas in the pipeline is 3-10%, the pressure is 2.0-2.5 MPa, and the temperature is 20-25℃.

[0065] Step 2. The purified gas obtained from the adsorption-desorption tower in Step 1 is depressurized by a regulating valve and then enters the purified gas separator for processing before being introduced into the purified gas storage tank.

[0066] Step 3. Determine the CO2 content of the purified gas in the purified gas storage tank. When the CO2 content of the purified gas in the purified gas storage tank is equal to 0.0050%, close the raw material gas supply side and the purified gas valve at the top of the adsorption-desorption tower. Heat the purified gas in the purified gas storage tank to 280-290℃ through the purge gas heater, and enter the adsorption-desorption tower through the top of the adsorption-desorption tower. Heat the adsorption-desorption tower, and the desorbed gas exits through the bottom of the adsorption-desorption tower. After being cooled by the desorbed gas cooler, it enters the desorbed gas storage tank. Then, after being purified by the desorbed gas separator, it enters the desorbed gas and purified gas mixing tank.

[0067] Step 4. After the adsorbent in the adsorption-desorption tower is completely regenerated, the remaining purified gas in the purified gas storage tank is introduced into the adsorption-desorption tower and mixed with the desorbed gas from the desorbed gas and purified gas mixing tank obtained in Step 3. The mixture is then pressurized by the desorbed gas and purified gas mixing compressor, and then heated by the desorbed gas and purified gas mixing heater before entering the downstream pipeline of the LNG feedstock. The calculation expression for the gas distribution is:

[0068]

[0069] Where C represents the CO2 content of the fuel gas, C S For the CO2 content of purified gas or CH4 gas cylinders, C D For desorption gas or CO2 content in CO2 cylinders, F S To purify the airflow, F D The desorption gas flow rate.

[0070] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0071] Although this application has been described above with reference to specific embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of this application. In particular, as long as there is no structural conflict, the features in the specific embodiments disclosed in this application can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, this application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A near-zero emission natural gas TSA pilot-scale experimental device, characterized in that, It includes a raw gas storage tank (1), a purified gas storage tank (2), a desorbed gas storage tank (3), a desorbed gas and purified gas mixing tank (4), and an adsorption-desorption tower (5). The raw gas storage tank (1) is connected to the adsorption-desorption tower (5), the desorbed gas cooler (9), and the LNG raw gas pipeline (13) through pipelines. The purified gas outlet at the top of the adsorption-desorption tower (5) is connected to the desorbed gas and purified gas mixing tank (4), the purified gas separator (6), and the purge gas heater (8) via pipelines; the purified gas separator (6) is connected to the purified gas storage tank (2) via pipelines; the purified gas storage tank (2) is connected to the desorbed gas and purified gas mixing tank (4), the purge gas heater (8), and the purified gas heat exchanger (7) via pipelines; and the purified gas heat exchanger is connected to the LNG raw material gas pipeline (13). The purge gas heater (8) is connected to the desorbed gas and purified gas mixing tank (4) via a pipeline; The desorbed gas cooler (9) is connected to the desorbed gas storage tank (3) via a pipeline. The desorbed gas storage tank (3) is connected to the desorbed gas separator (10) via a pipeline. The desorbed gas separator (10) is connected to the desorbed gas and purified gas mixing tank (4) via a pipeline. The desorbed gas and purified gas mixing tank (4) is connected to the desorbed gas and purified gas mixing compressor (11) via a pipeline. The desorbed gas and purified gas mixing compressor (11) is connected to the desorbed gas and purified gas mixing heater (12) via a pipeline. The desorbed gas and purified gas mixing heater (12) is connected to the LNG raw material gas pipeline (13), the natural gas combustion system (15), and the natural gas storage tank (16) via pipelines respectively. Each pipeline is equipped with a regulating valve (17).

2. The near-zero emission natural gas TSA pilot plant according to claim 1, characterized in that, Pressure measuring instruments (18) and temperature measuring instruments (19) are installed on the raw material gas storage tank (1), purified gas storage tank (2), desorbed gas storage tank (3), desorbed gas and purified gas mixing tank (4), and adsorption-desorption tower (5).

3. The near-zero emission natural gas TSA pilot plant according to claim 1, characterized in that, Sampling ports are provided on the raw material gas storage tank (1), the purified gas storage tank (2), the desorbed gas storage tank (3), and the desorbed gas and purified gas mixing tank (4).

4. The near-zero emission natural gas TSA pilot plant according to claim 3, characterized in that, The desorbed gas and purified gas mixed gas heater (12) is connected downstream of the LNG feed gas pipeline (13) via a pipeline.

5. A near-zero emission natural gas TSA pilot plant according to claim 4, characterized in that, The adsorption-desorption tower (5) has a heating function.

6. A method for operating a near-zero emission natural gas TSA pilot test apparatus, implemented based on the near-zero emission natural gas TSA pilot test apparatus as described in any one of claims 1-5, characterized in that, When the near-zero emission natural gas TSA pilot plant is used in conjunction with an LNG liquefaction system, the following steps are included: S1. The feed gas from the LNG feed gas pipeline enters the feed gas storage tank, and then is regulated in conjunction with the regulating valve at the top of the adsorption-desorption tower to ensure that the flow rate of the adsorption-desorption tower is 300-350 m³ / h. 3 The required pressure of 2.0-3.0 MPa per hour is introduced into the adsorption-desorption tower for purification. S2. The purified gas obtained from the adsorption-desorption tower in step S1 is depressurized by a regulating valve and then enters the purified gas separator for processing before being introduced into the purified gas storage tank. S3. Determine the CO2 content of the purified gas in the purified gas storage tank. When the CO2 content is less than 0.0050%, introduce the purified gas into the purified gas heat exchanger until the temperature reaches 20-25℃, which is similar to the temperature of the LNG pipeline, and then introduce it into the LNG feed gas pipeline. When the CO2 content is equal to 0.0050%, proceed to the next step. S4. When the CO2 content of the purified gas in the purified gas storage tank is equal to 0.0050%, close the raw material gas supply side and the purified gas valve at the top of the adsorption-desorption tower. Heat the purified gas in the purified gas storage tank to 280-290℃ through the purge gas heater, and enter the adsorption-desorption tower through the top of the adsorption-desorption tower. Heat the adsorption-desorption tower, and the desorbed gas exits through the bottom of the adsorption-desorption tower. After being cooled by the desorbed gas cooler, it enters the desorbed gas storage tank. Then, after being purified by the desorbed gas separator, it enters the desorbed gas and purified gas mixing tank. S5. The gas obtained in step S4 from the desorbed gas and purified gas mixing tank, after being pressurized by the desorbed gas and purified gas mixing compressor and heated by the desorbed gas and purified gas mixing heater, enters the natural gas combustion system as fuel for other equipment, or is introduced into a natural gas storage tank and transported to other locations as fuel for other equipment. The calculation expression for the gas distribution is: ； Where C represents the CO2 content of the fuel gas, C S For the CO2 content of purified gas or CH4 gas cylinders, C D For desorption gas or CO2 content in CO2 cylinders, F S To purify the airflow, F D The desorption gas flow rate.

7. The operating method of a near-zero emission natural gas TSA pilot test device according to claim 6, characterized in that, In step S1, the CO2 content of the LNG feed gas in the pipeline is 3-10%, the pressure is 2.0-2.5 MPa, and the temperature is 20-25℃.

8. The operating method of a near-zero emission natural gas TSA pilot test device according to claim 6, characterized in that, The CO2 content of natural gas used as fuel shall not exceed 30%.

9. A method for operating a near-zero emission natural gas TSA pilot test apparatus, implemented based on the near-zero emission natural gas TSA pilot test apparatus as described in any one of claims 1-4, characterized in that, When the near-zero emission natural gas TSA pilot plant is operated alone, it includes the following steps: Step 1. The feed gas from the LNG feed gas pipeline enters the feed gas storage tank, and then is regulated in conjunction with the regulating valve at the top of the adsorption-desorption tower to ensure that the flow rate of the adsorption-desorption tower is 300-350 m³ / h. 3 The required pressure of 2.0-3.0 MPa per hour is introduced into the adsorption-desorption tower for purification. Step 2. The purified gas obtained from the adsorption-desorption tower in Step 1 is depressurized by a regulating valve and then enters the purified gas separator for processing before being introduced into the purified gas storage tank. Step 3. Determine the CO2 content of the purified gas in the purified gas storage tank. When the CO2 content of the purified gas in the purified gas storage tank is equal to 0.0050%, close the raw material gas supply side and the purified gas valve at the top of the adsorption-desorption tower. Heat the purified gas in the purified gas storage tank to 280-290℃ through the purge gas heater, and enter the adsorption-desorption tower through the top of the adsorption-desorption tower. Heat the adsorption-desorption tower, and the desorbed gas exits through the bottom of the adsorption-desorption tower. After being cooled by the desorbed gas cooler, it enters the desorbed gas storage tank. Then, after being purified by the desorbed gas separator, it enters the desorbed gas and purified gas mixing tank. Step 4. After the adsorbent in the adsorption-desorption tower is completely regenerated, the remaining purified gas in the purified gas storage tank is introduced into the adsorption-desorption tower and mixed with the desorbed gas from the desorbed gas and purified gas mixing tank obtained in Step 3. The mixture is then pressurized by the desorbed gas and purified gas mixing compressor, and then heated by the desorbed gas and purified gas mixing heater before entering the downstream pipeline of the LNG feedstock. The calculation expression for the gas distribution is: ； Where C represents the CO2 content of the fuel gas, C S For the CO2 content of purified gas or CH4 gas cylinders, C D For desorption gas or CO2 content in CO2 cylinders, F S To purify the airflow, F D The desorption gas flow rate.

10. The operating method of a near-zero emission natural gas TSA pilot test device according to claim 9, characterized in that, In step 1, the CO2 content of the LNG feedstock gas in the pipeline is 3-10%, the pressure is 2.0-2.5 MPa, and the temperature is 20-25℃.

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