Dry gas seal control system for supercritical carbon dioxide compressor

Abstract

The utility model discloses a dry gas seal control system for a supercritical carbon dioxide compressor, which comprises a filtering mechanism, a parameter control mechanism, a sealing mechanism, a gas isolation mechanism and a leakage mechanism, an inlet of the filtering mechanism is communicated with a sealing gas source and is used for filtering sealing gas; an inlet of the parameter control mechanism is communicated with an outlet of the filtering mechanism and is used for controlling and adjusting the temperature, pressure and flow of the sealing gas; an inlet of the sealing mechanism communicates with an outlet of the parameter control mechanism and is used for implementing dry gas sealing; an inlet of the isolation gas mechanism is communicated with an isolation gas source, and an outlet is communicated with an inlet of the sealing mechanism for providing isolation gas for the sealing mechanism; an inlet of the leakage mechanism communicates with an outlet of the sealing mechanism and is used for monitoring and collecting sealing gas and isolation gas leaked by the sealing mechanism so as to represent the sealing operation state of the sealing mechanism. The problem that the operation stability and reliability of the dry gas seal of the supercritical carbon dioxide compressor are not ideal can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a dry gas seal technical field, concretely relates to a dry gas seal control system for supercritical carbon dioxide compressor. BACKGROUND

[0002] Supercritical carbon dioxide Brayton cycle power generation technology is the international frontier technology that the countries of the world are competing to research, and the technology adopts supercritical state carbon dioxide as circulating medium, and is 5%-10% higher than traditional water vapor Rankine cycle power generation technology in efficiency under the same condition, and meanwhile, equipment volume and weight are greatly reduced, and are considered as next generation advanced power cycle.

[0003] Centrifugal compressor provides energy for working medium through high-speed rotation of impeller, has advantages such as high efficiency, high pressure ratio and large variable working condition range, is the core component of supercritical carbon dioxide Brayton cycle system, and is one of key equipment for determining overall operation stability of system.

[0004] Supercritical carbon dioxide compressor inlet and outlet shaft end adopts dry gas seal, and small gas film formed between dry gas seal dynamic ring and static ring is relied on to reduce leakage amount, in order to ensure formation of gas film, prevent dry friction of dynamic ring and static ring, and need to inject high-pressure sealing gas, sealing gas is not allowed to carry liquid, and the pressure of sealing gas must be higher than gas pressure in shell, sealing gas is ensured to flow from dry gas seal to medium side, flush sealing surface, and prevent impurities in circulating process gas from flowing reversely and destroying sealing surface.

[0005] But the special physical property of supercritical carbon dioxide significantly influences sealing performance of dry gas seal, compared with compression process under normal temperature and normal pressure, working medium property changes sharply when supercritical carbon dioxide compressor is close to critical point at compression process starting point, and condensation may occur in compression process, so that operation stability and reliability of dry gas seal are both not ideal. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a dry gas seal control system for supercritical carbon dioxide compressor, which can solve the problems that operation stability and reliability of dry gas seal of supercritical carbon dioxide compressor are both not ideal.

[0007] The utility model realizes the following technical scheme:

[0008] The application discloses a dry gas seal control system for a supercritical carbon dioxide compressor, which comprises a filtering mechanism, an inlet of which is communicated with a sealing gas source, and the filtering mechanism is used for filtering the sealing gas; a parameter control mechanism, an inlet of which is communicated with an outlet of the filtering mechanism, and the parameter control mechanism is used for controlling and adjusting the temperature, pressure and flow of the sealing gas; a sealing mechanism, an inlet of which is communicated with an outlet of the parameter control mechanism, and the sealing mechanism is used for implementing dry gas seal; an isolation gas mechanism, an inlet of which is communicated with an isolation gas source, and an outlet of the isolation gas mechanism is communicated with an inlet of the sealing mechanism, and the isolation gas mechanism is used for providing the isolation gas for the sealing mechanism; and a leakage mechanism, an inlet of which is communicated with an outlet of the sealing mechanism, and the leakage mechanism is used for monitoring and collecting the sealing gas and the isolation gas leaked from the sealing mechanism to represent the sealing operation state of the sealing mechanism.

[0009] Optionally, the parameter control mechanism comprises a booster mechanism, a heating mechanism, a pressure flow control mechanism and a temperature measuring mechanism which are communicated in sequence; the inlet of the booster mechanism is communicated with the outlet of the filtering mechanism; and the outlet of the temperature measuring mechanism is communicated with the inlet of the sealing mechanism.

[0010] Optionally, the filtering mechanism comprises a first filtering pipe, a second filtering pipe and a filter group, the filter group comprises a plurality of parallel filters; the inlet of the first filtering pipe is communicated with the outlet of the compressor, and the outlet of the first filtering pipe is communicated with the inlet of the filter group; the inlet of the second filtering pipe is communicated with a start-up gas source, and the outlet of the second filtering pipe is communicated with the inlet of the filter group; the outlet of the filter group is communicated with the inlet of the booster mechanism; the first filtering pipe and the second filtering pipe are respectively provided with a gate valve and a check valve; and the filter group is parallelly provided with a pressure gauge and a differential pressure transmitter.

[0011] Optionally, the booster mechanism comprises a booster pump group and a buffer tank, the booster pump group comprises a plurality of parallel booster pumps; the inlet of the booster pump group is communicated with the outlet of the filter group, and the outlet of the booster pump group is communicated with the inlet of the buffer tank; and the outlet of the buffer tank is communicated with the inlet of the heating mechanism.

[0012] Optionally, the heating mechanism comprises an electric heater, a thermometer and a plurality of gate valves; the inlet and the outlet of the electric heater are respectively communicated with the outlet of the booster mechanism and the inlet of the pressure flow control mechanism; the thermometer is arranged at the outlet side of the booster mechanism; and the gate valves are arranged at the inlet side and / or the outlet side of the electric heater.

[0013] Optionally, the pressure flow control mechanism comprises a plurality of control pipes, the control pipes are provided with orifice plate flow transmitters and a plurality of needle valves; the inlets of all the control pipes are communicated with the outlet of the heating mechanism through pneumatic diaphragm regulating valves, the outlets of the control pipes are communicated with the inlets of the temperature measuring mechanism; the control pipes are provided with pressure gauges.

[0014] Optionally, the temperature measuring mechanism comprises a plurality of temperature transmitters, and the temperature transmitters correspond to and are connected with the control pipes one by one.

[0015] Optionally, the isolation gas mechanism comprises a plurality of isolation gas pipes, the isolation gas pipes are provided with orifice throttle transmitters and pressure gauges; the inlets of all the isolation gas pipes are communicated with an isolation gas source through filters, the outlets of all the isolation gas pipes are communicated with the inlets of the sealing mechanism, and the filters are provided with local differential pressure meters, pressure gauges and self-operated regulating valves.

[0016] Optionally, the leakage mechanism comprises a plurality of evacuation pipes, the evacuation pipes are provided with throttle orifice plates, pressure transmitters, bursting discs and a plurality of ball valves; the inlets of the evacuation pipes are communicated with the outlets of the sealing mechanism, and the outlets of the evacuation pipes are communicated with the external environment.

[0017] Optionally, a blowdown pipe is further included, the inlet of the blowdown pipe is communicated with the blowdown outlets of each filter and the blowdown outlet of the buffer tank; the inlet of the blowdown pipe is provided with a shut-off valve, and the outlet is provided with a check valve.

[0018] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0019] The dry gas sealing control system for the supercritical carbon dioxide compressor is characterized in that: the filter mechanism is arranged to filter the sealing gas introduced from the sealing gas source, so as to filter impurities, water vapor and the like in the sealing gas source, and ensure that the sealing gas is clean and dry; the parameter control mechanism is arranged to regulate and control the temperature, pressure and flow of the filtered sealing gas, so that the sealing gas meets the use conditions of the dry gas sealing; the sealing mechanism is arranged to implement the dry gas sealing by using the regulated and controlled sealing gas; the isolation gas mechanism is arranged to provide isolation gas for the sealing mechanism, so as to prevent the trace gas leaked from the dry gas sealing from being discharged to the atmosphere; the leakage mechanism is arranged to monitor the leakage amount of the dry gas sealing, so as to represent the sealing operation state, and collect the trace gas leaked from the dry gas sealing and a part of the isolation gas, which is used for high-point evacuation or connected to a unified evacuation pipeline; through the mutual cooperation of the above-mentioned features, the rationality and real-time performance of the dry gas sealing control system for the supercritical carbon dioxide compressor are effectively improved, the actual use state of the multiple sets of dry gas sealing can be grasped by the operating personnel in real time, and the problems that the operation stability and reliability of the dry gas sealing of the supercritical carbon dioxide compressor are not ideal are effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and together with the description serve to explain the principles of the present application. In the drawings:

[0021] Figure 1 A schematic view of the dry gas seal control system for the supercritical carbon dioxide compressor provided by the embodiments of the present application;

[0022] Figure 2 A first schematic view of the filtering mechanism of the dry gas seal control system for the supercritical carbon dioxide compressor provided by the embodiments of the present application;

[0023] Figure 3 A second schematic view of the filtering mechanism of the dry gas seal control system for the supercritical carbon dioxide compressor provided by the embodiments of the present application;

[0024] Figure 4 A first schematic view of the pressurizing mechanism of the dry gas seal control system for the supercritical carbon dioxide compressor provided by the embodiments of the present application;

[0025] Figure 5 A second schematic view of the pressurizing mechanism of the dry gas seal control system for the supercritical carbon dioxide compressor provided by the embodiments of the present application;

[0026] Figure 6 A third schematic view of the pressurizing mechanism of the dry gas seal control system for the supercritical carbon dioxide compressor provided by the embodiments of the present application;

[0027] Figure 7 A schematic view of the heating mechanism of the dry gas seal control system for the supercritical carbon dioxide compressor provided by the embodiments of the present application;

[0028] Figure 8 A schematic view of the pressure flow control mechanism of the dry gas seal control system for the supercritical carbon dioxide compressor provided by the embodiments of the present application;

[0029] Figure 9 A schematic view of the temperature measuring mechanism of the dry gas seal control system for the supercritical carbon dioxide compressor provided by the embodiments of the present application;

[0030] Figure 10 A schematic view of the isolating gas mechanism of the dry gas seal control system for the supercritical carbon dioxide compressor provided by the embodiments of the present application;

[0031] Figure 11The utility model provides a schematic view of the leakage mechanism of the dry gas seal control system of the supercritical carbon dioxide compressor.

[0032] Figure 12 The utility model provides a schematic view of the blow-off pipe of the dry gas seal control system of the supercritical carbon dioxide compressor.

[0033] Markings in the drawing and corresponding component names:

[0034] 10-filter mechanism, 11-first filter pipe, 12-second filter pipe, 13-filter, 20-parameter control mechanism, 21-pressurization mechanism, 211-buffer tank, 212-pressurization pump, 213-electric pressurization pump, 22-heating mechanism, 221-electric heater, 222-thermometer, 23-pressure flow control mechanism, 231-control pipe, 232-flow transmitter, 233-pneumatic diaphragm regulating valve, 24-temperature measuring mechanism, 241-temperature transmitter, 30-sealing mechanism, 40-isolation gas mechanism, 41-isolation gas pipe, 42-orifice plate throttling transmitter, 43-filter, 431-in-situ differential pressure gauge, 432-pressure gauge, 433-self-operated regulating valve, 50-leakage mechanism, 51-evacuation pipe, 52-orifice plate, 53-pressure transmitter, 54-bursting disc, 55-ball valve, 60-blow-off pipe, 61-shutoff valve, 62-check valve. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model is further explained in detail below by combining with examples and drawings, and the schematic implementation mode and the explanation thereof of the utility model are only used for explaining the utility model, and do not serve as the limitation of the utility model.

[0036] EXAMPLE

[0037] Please refer to Figures 1 to 12The embodiment provides a dry gas seal control system for a supercritical carbon dioxide compressor, which comprises a filtering mechanism 10, an inlet of the filtering mechanism 10 being communicated with a seal gas source, and the filtering mechanism 10 being used for filtering seal gas; a second parameter control mechanism 20, an inlet of the parameter control mechanism 20 being communicated with an outlet of the filtering mechanism 10, and the parameter control mechanism 20 being used for controlling and adjusting temperature, pressure and flow of the seal gas; a third sealing mechanism 30, an inlet of the sealing mechanism 30 being communicated with an outlet of the parameter control mechanism 20, and the sealing mechanism 30 being used for implementing dry gas seal; a fourth isolation gas mechanism 40, an inlet of the isolation gas mechanism 40 being communicated with an isolation gas source, and an outlet of the isolation gas mechanism 40 being communicated with an inlet of the sealing mechanism 30, and the isolation gas mechanism 40 being used for providing isolation gas for the sealing mechanism 30; and a fifth leakage mechanism 50, an inlet of the leakage mechanism 50 being communicated with an outlet of the sealing mechanism 30, and the leakage mechanism 50 being used for monitoring and collecting the seal gas and the isolation gas leaked from the sealing mechanism 30, so as to represent a sealing operation state of the sealing mechanism 30.

[0038] The dry gas seal control system for the supercritical carbon dioxide compressor provided by the embodiment can ensure that the seal gas is clean and dry by setting the filtering mechanism 10, filtering the seal gas from the seal gas source, filtering impurities and water vapor in the seal gas source, and ensuring that the seal gas is clean and dry; the seal gas can meet the use conditions of the dry gas seal by setting the parameter control mechanism 20, controlling and adjusting the temperature, pressure and flow of the filtered seal gas; the dry gas seal can be implemented by setting the sealing mechanism 30, the isolation gas mechanism 40 is set to provide isolation gas for the sealing mechanism, and the trace gas leaked from the dry gas seal is prevented from being discharged to the atmosphere; the leakage mechanism 50 is set to monitor the leakage amount of the dry gas seal, so as to represent the sealing operation state, and collect the trace gas leaked from the dry gas seal and part of the isolation gas, which is used for high-point emptying or connected to a unified emptying pipeline; the rationality and real-time performance of the dry gas seal control system for the supercritical carbon dioxide compressor are effectively improved by the cooperation of the above-mentioned features, the actual use state of multiple sets of dry gas seals can be grasped by operation personnel in real time, and the problems that the operation stability and reliability of the dry gas seal of the supercritical carbon dioxide compressor are not ideal are effectively solved.

[0039] In order to further explain the specific structure of the parameter control mechanism 20, the parameter control mechanism 20 comprises a pressurizing mechanism 21, a heating mechanism 22, a pressure flow control mechanism 23 and a temperature measuring mechanism 24 which are communicated in sequence; the inlet of the pressurizing mechanism 21 is communicated with the outlet of the filtering mechanism 10; and the outlet of the temperature measuring mechanism 24 is communicated with the inlet of the sealing mechanism 30.

[0040] Through the above setting, the pressurizing mechanism 21 is used to pressurize the sealing gas to cope with the situation that the field gas source pressure does not meet the sealing gas condition; the heating mechanism 22 is arranged to heat the sealing gas to adjust its temperature; the pressure flow control mechanism 23 is arranged to accurately adjust the inlet pressure and flow of the sealing gas; and the temperature measuring mechanism 24 is arranged to feedback the inlet temperature of the sealing gas.

[0041] In order to further explain the specific structure of the filtering mechanism 10, the filtering mechanism 10 comprises a first filtering pipe 11, a second filtering pipe 12 and a filter group, the filter group comprises a plurality of parallel filters 13; the inlet of the first filtering pipe 11 is communicated with the outlet of the compressor, the outlet of the first filtering pipe 11 is communicated with the inlet of the filter group; the inlet of the second filtering pipe 12 is communicated with the start-up gas source, the outlet of the second filtering pipe 12 is communicated with the inlet of the filter group; the outlet of the filter group is communicated with the inlet of the pressurizing mechanism 21; the first filtering pipe 11 and the second filtering pipe 12 are respectively provided with a gate valve and a check valve; the filter group is provided in parallel with a pressure gauge and a differential pressure transmitter.

[0042] Through the above setting, when the compressor is just started, the start-up gas is input as the gas source; when the compressor outlet gas meets the sealing gas source condition after the start-up, the compressor outlet gas is switched as the gas source.

[0043] In order to further explain the specific structure of the pressurizing mechanism 21, the pressurizing mechanism 21 comprises a pressurizing pump group and a buffer tank 211, the pressurizing pump group comprises a plurality of parallel pressurizing pumps 212; the inlet of the pressurizing pump group is communicated with the outlet of the filter group, the outlet of the pressurizing pump group is communicated with the inlet of the buffer tank 211; the outlet of the buffer tank 211 is communicated with the inlet of the heating mechanism.

[0044] In other embodiments, optionally, the pressurizing mechanism 21 comprises an electric pressurizing pump 213, a plurality of gate valves and a plurality of check valves; the inlet and outlet of the electric pressurizing pump 213 are respectively communicated with the outlet of the filter group and the inlet of the heating mechanism; the gate valves and the check valves are arranged on the inlet side and / or the outlet side of the electric pressurizing pump 213.

[0045] In order to further explain the specific structure of the heating mechanism 22, the heating mechanism 22 comprises an electric heater 221, a thermometer 222 and a plurality of gate valves; the inlet and outlet of the electric heater 221 are respectively communicated with the outlet of the pressurizing mechanism 21 and the inlet of the pressure flow control mechanism 23; the thermometer 222 is arranged on the outlet side of the pressurizing mechanism 21; the gate valves are arranged on the inlet side and / or the outlet side of the electric heater 221.

[0046] To further explain the specific structure of the pressure and flow control mechanism 23, the pressure and flow control mechanism 23 includes several control tubes 231, each control tube 231 is equipped with an orifice plate flow transmitter 232 and several needle valves; the inlet of all the control tubes 231 is connected to the outlet of the heating mechanism 22 through a pneumatic diaphragm regulating valve 233, and the outlet of the control tubes 231 is connected to the inlet of the temperature measuring mechanism; the control tubes 231 are equipped with pressure gauges.

[0047] To further explain the specific structure of the temperature measuring mechanism 24, the temperature measuring mechanism 24 includes a plurality of temperature transmitters 241, and the temperature transmitters 241 correspond one-to-one with and are connected to the control tube 231.

[0048] To further explain the specific structure of the isolation gas mechanism 40, the isolation gas mechanism 40 includes several isolation gas pipes 41, each of which is equipped with an orifice plate throttling transmitter 42 and a pressure gauge; the inlets of all the isolation gas pipes 41 are connected to the isolation gas source through a filter 43, and the outlets of all the isolation gas pipes 41 are connected to the inlet of the sealing mechanism 30; the filter 43 is equipped with a local differential pressure gauge 431, a pressure gauge 432, and a self-regulating valve 433.

[0049] To further explain the specific structure of the leakage mechanism 50, the leakage mechanism 50 includes several vent pipes 51, each vent pipe 51 is equipped with a throttling orifice plate 52, a pressure transmitter 53, a rupture disc 54, and several ball valves 55; the inlet of the vent pipe 51 is connected to the outlet of the sealing mechanism 30, and the outlet of the vent pipe 51 is connected to the external environment.

[0050] In order to centrally process the turbid fluid discharged from the filter 13 and the buffer tank 211, the above-mentioned dry gas seal control system for the supercritical carbon dioxide compressor also includes a drain pipe 60. The inlet of the drain pipe 60 is connected to the drain port of each of the filters 13 and the drain port of the buffer tank 211. A shut-off valve 61 is provided at the inlet of the drain pipe 60 and a check valve 62 is provided at the outlet.

[0051] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A dry gas seal control system for a supercritical carbon dioxide compressor, characterized by, The application relates to a sealing gas system, which comprises: a filtering mechanism (10) having an inlet connected with a sealing gas source and being used for filtering the sealing gas; a parameter control mechanism (20) having an inlet connected with the outlet of the filtering mechanism (10) and being used for controlling and adjusting the temperature, pressure and flow of the sealing gas; a sealing mechanism (30) having an inlet connected with the outlet of the parameter control mechanism (20) and being used for implementing dry gas sealing; an isolation gas mechanism (40) having an inlet connected with an isolation gas source and an outlet connected with the inlet of the sealing mechanism (30) and being used for providing the isolation gas for the sealing mechanism (30); a leakage mechanism (50) having an inlet connected with the outlet of the sealing mechanism (30) and being used for monitoring and collecting the sealing gas and the isolation gas leaked from the sealing mechanism (30) to characterize the sealing operation state of the sealing mechanism (30).

2. The dry gas seal control system for a supercritical carbon dioxide compressor of claim 1, wherein, The parameter control mechanism (20) comprises a booster mechanism (21), a heating mechanism (22), a pressure flow control mechanism (23) and a temperature measuring mechanism (24) connected in sequence. The inlet of the booster mechanism (21) is connected with the outlet of the filtering mechanism (10). The outlet of the temperature measuring mechanism (24) is connected with the inlet of the sealing mechanism (30).

3. The dry gas seal control system for a supercritical carbon dioxide compressor of claim 2, wherein, The filtering mechanism (10) comprises a first filtering pipe (11), a second filtering pipe (12) and a filter group, wherein the filter group comprises a plurality of parallel filters (13). The inlet of the first filtering pipe (11) is connected with the outlet of a compressor, and the outlet of the first filtering pipe (11) is connected with the inlet of the filter group. The inlet of the second filtering pipe (12) is connected with a start-up gas source, and the outlet of the second filtering pipe (12) is connected with the inlet of the filter group. The outlet of the filter group is connected with the inlet of the booster mechanism (21). The first filtering pipe (11) and the second filtering pipe (12) are respectively provided with a gate valve and a check valve. The filter group is provided with a pressure gauge and a differential pressure transmitter in parallel.

4. The dry gas seal control system for a supercritical carbon dioxide compressor of claim 3, wherein, The booster mechanism (21) comprises a booster pump group and a buffer tank (211), wherein the booster pump group comprises a plurality of parallel booster pumps (212). The inlet of the booster pump group is connected with the outlet of the filter group, and the outlet of the booster pump group is connected with the inlet of the buffer tank (211). The outlet of the buffer tank (211) is connected with the inlet of the heating mechanism.

5. The dry gas seal control system for a supercritical carbon dioxide compressor of claim 4, wherein, The heating mechanism (22) comprises an electric heater (221), a thermometer (222) and a plurality of gate valves. The inlet and outlet of the electric heater (221) are respectively connected with the outlet of the booster mechanism (21) and the inlet of the pressure flow control mechanism (23). The thermometer (222) is arranged on the outlet side of the booster mechanism (21). The gate valve is arranged at the inlet side and / or outlet side of the electric heater (221).

6. The dry gas seal control system for a supercritical carbon dioxide compressor of claim 5, wherein, The pressure flow control mechanism (23) comprises a plurality of control pipes (231) provided with orifice flow transmitters (232) and needle valves; The inlets of all the control pipes (231) are communicated with the outlet of the heating mechanism (22) through pneumatic diaphragm regulating valves (233), and the outlets of the control pipes (231) are communicated with the inlets of the temperature measuring mechanism; The control pipes (231) are provided with pressure gauges.

7. The dry gas seal control system for a supercritical carbon dioxide compressor of claim 6, wherein, The temperature measuring mechanism (24) comprises a plurality of temperature transmitters (241) corresponding to and connected with the control pipes (231).

8. The dry gas seal control system for a supercritical carbon dioxide compressor of claim 7, wherein, The isolation gas mechanism (40) comprises a plurality of isolation gas pipes (41) provided with orifice throttle transmitters (42) and pressure gauges; The inlets of all the isolation gas pipes (41) are communicated with an isolation gas source through filters (43), the outlets of all the isolation gas pipes (41) are communicated with the inlets of the sealing mechanism (30), and the filters (43) are provided with local differential pressure meters (431), pressure gauges (432) and self-operated regulating valves (433).

9. The dry gas seal control system for a supercritical carbon dioxide compressor of claim 8, wherein, The leakage mechanism (50) comprises a plurality of exhaust pipes (51) provided with throttle orifice plates (52), pressure transmitters (53), bursting discs (54) and a plurality of ball valves (55); The inlets of the exhaust pipes (51) are communicated with the outlets of the sealing mechanism (30), and the outlets of the exhaust pipes (51) are communicated with the external environment.

10. The dry gas seal control system for a supercritical carbon dioxide compressor of claim 9, wherein, A blowdown pipe (60) is further included, the inlet of the blowdown pipe (60) is communicated with the blowdown outlets of each filter (13) and the blowdown outlet of the buffer tank (211); The inlet of the blowdown pipe (60) is provided with a shut-off valve (61), and the outlet is provided with a check valve (62).

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