CN209909561U - Thermal balance system of pressure reduction system - Google Patents
Thermal balance system of pressure reduction system Download PDFInfo
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- CN209909561U CN209909561U CN201821322363.7U CN201821322363U CN209909561U CN 209909561 U CN209909561 U CN 209909561U CN 201821322363 U CN201821322363 U CN 201821322363U CN 209909561 U CN209909561 U CN 209909561U
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- 230000009467 reduction Effects 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 117
- 230000008569 process Effects 0.000 claims abstract description 115
- 230000006837 decompression Effects 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 17
- 230000009471 action Effects 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 239000002351 wastewater Substances 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000000110 cooling liquid Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000003245 coal Substances 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 10
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 239000000295 fuel oil Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- -1 steam Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The utility model belongs to the technical field of coal chemical industry and petrochemical equipment, concretely relates to pressure reducing system's thermodynamic balance system. The pressure reduction system is used for high-temperature and high-pressure working conditions and comprises a main process module, a mechanical control system, a thermodynamic balance system and an intelligent control system; the thermodynamic equilibrium system provides media with different temperatures, pressures and types for the main process module of the decompression system according to the instruction of the intelligent control system, and the functions of temperature control, pressure control, cleaning, sealing detection and the like in the decompression system are realized. The utility model discloses thermodynamic equilibrium system is applicable to the decompression system under the high temperature high pressure operating mode, can ensure decompression system's various functions, the whole life of extension decompression system.
Description
Technical Field
The utility model belongs to the technical field of coal chemical industry and petrochemical equipment, concretely relates to pressure reducing system's thermodynamic balance system.
Background
For the non-fixed bed hydrogenation device under construction or already in operation at present, as the feed is a mixture of heavy oil (coal tar, atmospheric residual oil, vacuum residual oil, catalytic slurry oil, fuel oil and the like) and an additive or a mixture of heavy oil and coal powder (slurry oil), a pressure reducing valve group with a high thermal component to a low thermal component is under the working conditions of high temperature, high pressure difference and high solid content, is easy to be damaged by scouring and abrasion, has the problem of abrasion of different degrees, needs to be switched and overhauled for the shortest hours and the longest months, and has the advantages of high operation difficulty, high overhaul cost, great potential safety hazard and difficult stable operation.
Therefore, a multi-path main process pipeline combination scheme with a pressure reduction function is provided in the industry, so that the whole service life of the pressure reduction system is prolonged. The pressure reduction system is used under the severe working conditions of high temperature of 300-600 ℃ and pressure of 10-30 MPa, and an additional guarantee system is required to be added in order to ensure safe, reliable and stable operation among multiple pipelines of the pressure reduction system. For example, when switching pipelines, the pressure balance between each pipeline section needs to be controlled, so that the accelerated loss of key equipment is avoided. Before the pipeline is put into use, heating hot standby is needed, so that the pipeline or equipment is prevented from being damaged due to the fact that high-temperature media directly enter the pipeline; after the device is put into use, in order to facilitate quick maintenance, the temperature needs to be reduced at a reasonable speed so as to save maintenance time; meanwhile, the cleaning is carried out quickly and thoroughly, so that the influence of coking and blockage of the pipeline on the next use is avoided.
Therefore, it is necessary to design a reasonable thermodynamic equilibrium system to ensure the normal operation of the pressure reduction system.
Disclosure of Invention
An object of the utility model is to provide a pressure reducing system's thermodynamic equilibrium system to guarantee pressure reducing system's normal operating.
The technical scheme of the utility model as follows:
a thermal equilibrium system of a pressure reduction system is used for high-temperature and high-pressure working conditions and comprises a main process module, a mechanical control system, a thermal equilibrium system and an intelligent control system;
the process medium enters the main process module, the mechanical control system outputs torque under the instruction of the intelligent control system, and each valve of the main process module performs action switching and opening adjustment, so that the process medium is decompressed and then flows out of the decompression system;
the main process module of the pressure reducing system adopts two to seven main process pipelines containing pressure reducing valve banks, each main process pipeline is completely the same and comprises a pressure reducing valve bank taking a pressure reducing regulating valve as a core and taking a front stop valve and a rear stop valve or a switching valve as an auxiliary, and each valve in the pressure reducing valve bank comprises an automatic valve and a manual valve according to needs;
the method is characterized in that: the thermodynamic equilibrium system provides media with different temperatures, pressures and types for the main process module of the decompression system according to the instruction of the intelligent control system, and the functions of temperature control, pressure control, cleaning, sealing detection and the like in the decompression system are realized;
the thermodynamic equilibrium system comprises a thermodynamic equilibrium module I and a thermodynamic equilibrium module II;
the thermodynamic equilibrium module I is used for executing at least one of the following actions: injecting a thermal equilibrium medium into a pipeline in the main process module, recovering the thermal equilibrium medium from the main process module to the first thermal equilibrium module for processing, and directly discharging the thermal equilibrium medium from the main process module;
the second thermodynamic equilibrium module is used for executing at least one of the following actions: injecting a thermodynamic equilibrium medium into a valve in the main process module, recovering the thermodynamic equilibrium medium from the main process module to a first thermodynamic equilibrium module for processing, and directly discharging the thermodynamic equilibrium medium from the main process module;
the first thermal balance module and the second thermal balance module respectively comprise at least one functional unit of a storage unit, a switching unit, a heating unit, a cooling unit and a conveying unit;
further, in the pressure reducing system of the thermodynamic equilibrium system as described above, the functional units in the first thermodynamic equilibrium module and the second thermodynamic equilibrium module are in the form of one of the following two types:
the shared part of the functional units are independent of each other.
Further, in the above thermodynamic equilibrium system of the pressure reduction system, the first thermodynamic equilibrium module and the second thermodynamic equilibrium module, the storage unit is a storage tank;
the switching unit is a pipeline comprising a plurality of valves;
the heating unit is one of an electric heater and a heat exchanger for heating liquid; when the heating unit is a heat exchanger, the heating unit is one of an air heat exchanger, a steam heat exchanger and a circulating water heat exchanger;
the cooling unit is a heat exchanger for cooling liquid; the heat exchanger as a cooling unit is one of an air cooler and a circulating water cooler;
the conveying unit is a pump set and front and rear connecting pipelines.
Further, in the thermodynamic equilibrium system of the pressure reduction system, as described above, the first thermodynamic equilibrium module injects or recovers a thermodynamic equilibrium medium into or from each pipeline of the main process module through the pipeline system N1, the pipeline system N2, the pipeline system N3 and the pipeline system N4 respectively;
a pipe system N1, a pipe system N2, a pipe system N3 and a pipe system N4 of the first thermodynamic equilibrium module form a connection point I, a connection point II, a connection point III and a connection point IV with a main process pipe line in the main process module respectively;
the connection point I, the connection point II, the connection point III and the connection point IV are connected with a thermodynamic equilibrium medium inlet or outlet of the thermodynamic equilibrium module I;
and pressure gauges are respectively arranged near the connection point I, the connection point II, the connection point III and the connection point IV.
Further, in the thermodynamic equilibrium system of the pressure reduction system as described above, the second thermodynamic equilibrium module injects thermodynamic equilibrium media into each main process pipeline valve of the main process module through the pipeline system L1, the pipeline system L2, the pipeline system L3, the pipeline system L4 and the pipeline system L5 respectively.
Further, the thermodynamic equilibrium system of the pressure reduction system selects thermodynamic equilibrium media with different temperatures, pressures and types according to system requirements; the thermodynamic equilibrium medium is one of oil, steam, nitrogen and water.
Further, according to the thermodynamic equilibrium system of the pressure reduction system, when the main process module performs one of temperature control and pressure control, the thermodynamic equilibrium system provides oil products in one of two states of constant temperature and continuous temperature change as thermodynamic equilibrium media to the main process module according to the requirements of the intelligent control system;
one of the following actions is then performed: the water is kept in the main process module for a set time, recovered to the first thermodynamic equilibrium module for treatment and directly discharged from a main process pipeline in the main process module.
Further, the thermodynamic equilibrium system of the depressurization system as described above provides one of the following three thermodynamic equilibrium media to the main process module according to the requirements of the intelligent control system when the main process module is cleaned: oil products with constant temperature and one of two states of continuous temperature change; steam of constant temperature; nitrogen at a constant temperature;
one of the following actions is then performed: the water is kept in the main process module for a set time, recovered to the first thermodynamic equilibrium module for treatment and directly discharged from a main process pipeline in the main process module.
Further, according to the thermodynamic equilibrium system of the pressure reduction system, when the main process module performs sealing detection, the thermodynamic equilibrium system provides nitrogen with constant temperature as a thermodynamic equilibrium medium to the main process module according to the requirements of the intelligent control system, keeps a set time in the main process module, and performs detection by matching with a pressure gauge.
The utility model discloses a show the effect and lie in:
(1) the utility model discloses thermodynamic equilibrium system is applicable to the decompression system under the high temperature high pressure operating mode, can ensure decompression system's various functions, the whole life of extension decompression system.
(2) The utility model discloses the thermodynamic equilibrium system integration nature is good, degree of automation is high, the security is good, maintainability is strong.
(3) The utility model discloses the public engineering demand of thermodynamic balance system can draw materials locally, and the at utmost reduces primary equipment input cost and secondary energy consumption cost, and economic suitability is strong.
Drawings
FIG. 1 is a schematic view of an embodiment of a reduced pressure system;
FIG. 2 is a functional block diagram of a pressure relief system.
In the figure: A. a first thermal balance module; B. a second thermal balance module; C. valves for the main process line; D. each pipeline of the main process pipeline; E. an intelligent control system; 1. a main process line inlet; 2. an upstream first cut-off valve; 3. an upstream second cut-off valve; 4. a pressure reducing regulating valve; 5. a downstream second cut-off valve; 6. A downstream first cut-off valve; 7. a main process line outlet; 8. a thermodynamic equilibrium system; 9. a machine control system; 31. connecting a pipeline I; 32. connecting a pipeline II; 33. a connecting pipe III; 34. a connecting pipeline IV; 35. A connecting pipeline V; 36. a connecting pipe VI; 81. a connection point I; 82. a connection point II; 83. a connection point III; 84. connection point IV.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, the present invention relates to a thermal balance system of a pressure reducing system, wherein the pressure reducing system is used in a high-temperature and high-pressure working condition, and comprises a main process module, a mechanical control system, a thermal balance system and an intelligent control system;
the process medium enters the main process module, the mechanical control system outputs torque under the instruction of the intelligent control system, and each valve of the main process module performs action switching and opening adjustment, so that the process medium is decompressed and then flows out of the decompression system;
the main process module of the pressure reducing system adopts two to seven main process pipelines containing pressure reducing valve banks, each main process pipeline is completely the same and comprises a pressure reducing valve bank taking a pressure reducing regulating valve as a core and taking a front stop valve and a rear stop valve or a switching valve as an auxiliary, and each valve in the pressure reducing valve bank comprises an automatic valve and a manual valve according to needs;
as shown in fig. 1, the main process module of the pressure reducing system adopts two main process pipelines including pressure reducing valve banks, wherein the two main process pipelines are completely the same, and one main process pipeline can run, one auxiliary process pipeline can be used for standby, or two main process pipelines can run simultaneously.
Take one way as an example, main process pipeline contain connecting tube I (31), first trip valve of upper reaches (2), connecting tube II (32), second trip valve of upper reaches (3), connecting tube III (33), relief pressure valve (4), connecting tube IV (34), second trip valve of low reaches (5), connecting tube V (35), first trip valve of low reaches (6), connecting tube VI (36) in proper order.
Taking the other path as an example, the mechanical control system (9) is respectively connected with the upstream first cut-off valve (2), the upstream second cut-off valve (3), the pressure reducing valve (4), the downstream second cut-off valve (5) and the downstream first cut-off valve (6) of the path. The mechanical control system (9) provides torque required by the action of various automatic valves and acts according to the instruction of the intelligent control system, so that the opening and closing of each valve or the opening degree adjustment are controlled.
The thermodynamic equilibrium system provides media with different temperatures, pressures and types for a main process pipeline of the pressure reduction system according to the instruction of the intelligent control system, and the functions of temperature control, pressure control, cleaning, sealing detection and the like in the pressure reduction system are realized;
the thermodynamic equilibrium system comprises a thermodynamic equilibrium module I and a thermodynamic equilibrium module II;
the thermodynamic equilibrium module I is used for executing at least one of the following actions: injecting a thermal equilibrium medium into a pipeline in the main process module, recovering the thermal equilibrium medium from the main process module to the first thermal equilibrium module for processing, and directly discharging the thermal equilibrium medium from the main process module;
the second thermodynamic equilibrium module is used for executing at least one of the following actions: injecting a thermodynamic equilibrium medium into a valve in the main process module, recovering the thermodynamic equilibrium medium from the main process module to a first thermodynamic equilibrium module for processing, and directly discharging the thermodynamic equilibrium medium from the main process module;
the first thermal balance module and the second thermal balance module respectively comprise at least one functional unit of a storage unit, a switching unit, a heating unit, a cooling unit and a conveying unit;
comprises at least one functional unit of a storage unit, a switching unit, a heating unit, a cooling unit and a conveying unit;
the form of the functional unit in the first thermal balance module and the second thermal balance module is one of the following two types:
the shared part of the functional units are independent from each other;
in the first thermodynamic equilibrium module and the second thermodynamic equilibrium module, the storage unit is a storage tank;
the switching unit is a pipeline comprising a plurality of valves;
the heating unit is one of an electric heater and a heat exchanger for heating liquid; when the heating unit is a heat exchanger, the heating unit is one of an air heat exchanger, a steam heat exchanger and a circulating water heat exchanger;
the cooling unit is a heat exchanger for cooling liquid; the heat exchanger as a cooling unit is one of an air cooler and a circulating water cooler;
the conveying unit is a pump set and front and rear connecting pipelines;
the first thermodynamic equilibrium module injects or recovers thermodynamic equilibrium media into or from the pipeline of each main process pipeline of the main process module through a pipeline system N1, a pipeline system N2, a pipeline system N3 and a pipeline system N4 respectively;
a pipe system N1, a pipe system N2, a pipe system N3 and a pipe system N4 of the thermodynamic equilibrium module I form a connection point I81, a connection point II82, a connection point III83 and a connection point IV84 with a main process pipe line in the main process module respectively;
the connection point I81, the connection point II82, the connection point III83 and the connection point IV84 are connected with a thermodynamic equilibrium medium inlet or outlet of the first thermodynamic equilibrium module;
pressure gauges are respectively arranged near the connection point I81, the connection point II82, the connection point III83 and the connection point IV 84;
the second thermodynamic equilibrium module injects thermodynamic equilibrium media into each main process pipeline valve of the main process module through a pipeline system L1, a pipeline system L2, a pipeline system L3, a pipeline system L4 and a pipeline system L5 respectively;
selecting thermodynamic equilibrium media with different temperatures, pressures and types according to system requirements; the thermodynamic equilibrium medium is one of oil, steam, nitrogen and water;
when the main process module controls one of temperature control and pressure control, the thermodynamic equilibrium system provides oil products in one of two states of constant temperature and continuous temperature change as thermodynamic equilibrium media to the main process module according to the requirements of the intelligent control system; one of the following actions is then performed: keeping the set time in the main process module, recycling the waste water to the first thermodynamic equilibrium module for treatment, and directly discharging the waste water from a main process pipeline in the main process module;
when the main process module is cleaned, the thermodynamic equilibrium system provides one of the following three thermodynamic equilibrium media to the main process module according to the requirements of the intelligent control system: oil products with constant temperature and one of two states of continuous temperature change; steam of constant temperature; nitrogen at a constant temperature; one of the following actions is then performed: keeping the set time in the main process module, recycling the waste water to the first thermodynamic equilibrium module for treatment, and directly discharging the waste water from a main process pipeline in the main process module;
when the main process module carries out sealing detection, the thermal balance system provides nitrogen with constant temperature as a thermal balance medium to the main process module according to the requirements of the intelligent control system, and the nitrogen is kept for a set time in the main process module and is matched with a pressure gauge for detection.
Claims (1)
1. A thermal equilibrium system of a pressure reducing system is used for high-temperature and high-pressure working conditions and comprises a main process module, a mechanical control system (9), a thermal equilibrium system (8) and an intelligent control system;
the process medium enters the main process module, the mechanical control system (9) outputs torque under the instruction of the intelligent control system, and each valve of the main process module performs action switching and opening adjustment, so that the process medium is decompressed and then flows out of the decompression system;
the main process module of the pressure reducing system adopts two to seven main process pipelines containing pressure reducing valve banks, each main process pipeline is completely the same and contains a pressure reducing valve bank taking a pressure reducing regulating valve (4) as a core and a front and back cut-off valve or a switching valve as an auxiliary, and each valve in the pressure reducing valve bank comprises an automatic valve and a manual valve according to needs;
the method is characterized in that: the thermodynamic equilibrium system (8) provides media with different temperatures, pressures and types for a main process pipeline of the pressure reduction system according to the instruction of the intelligent control system, and realizes the functions of temperature control, pressure control, cleaning, sealing detection and the like in the pressure reduction system;
the thermodynamic equilibrium system (8) comprises a thermodynamic equilibrium module I and a thermodynamic equilibrium module II;
the thermodynamic equilibrium module I is used for executing at least one of the following actions: injecting a thermal equilibrium medium into a pipeline in the main process module, recovering the thermal equilibrium medium from the main process module to the first thermal equilibrium module for processing, and directly discharging the thermal equilibrium medium from the main process module;
the second thermodynamic equilibrium module is used for executing at least one of the following actions: injecting a thermodynamic equilibrium medium into a valve in the main process module, recovering the thermodynamic equilibrium medium from the main process module to a first thermodynamic equilibrium module for processing, and directly discharging the thermodynamic equilibrium medium from the main process module;
the first thermal balance module and the second thermal balance module respectively comprise at least one functional unit of a storage unit, a switching unit, a heating unit, a cooling unit and a conveying unit;
the form of the functional unit in the first thermal balance module and the second thermal balance module is one of the following two types:
the shared part of the functional units are independent from each other;
in the first thermodynamic equilibrium module and the second thermodynamic equilibrium module, the storage unit is a storage tank;
the switching unit is a pipeline comprising a plurality of valves;
the heating unit is one of an electric heater and a heat exchanger for heating liquid; when the heating unit is a heat exchanger, the heating unit is one of an air heat exchanger, a steam heat exchanger and a circulating water heat exchanger;
the cooling unit is a heat exchanger for cooling liquid; the heat exchanger as a cooling unit is one of an air cooler and a circulating water cooler;
the conveying unit is a pump set and front and rear connecting pipelines;
the first thermodynamic equilibrium module injects or recovers thermodynamic equilibrium media into or from the pipeline of each main process pipeline of the main process module through a pipeline system N1, a pipeline system N2, a pipeline system N3 and a pipeline system N4 respectively;
a pipe system N1, a pipe system N2, a pipe system N3 and a pipe system N4 of the first thermodynamic equilibrium module form a connection point I (81), a connection point II (82), a connection point III (83) and a connection point IV (84) with a main process pipe line in the main process module respectively;
the connection point I (81), the connection point II (82), the connection point III (83) and the connection point IV (84) are connected with a thermodynamic equilibrium medium inlet or outlet of the thermodynamic equilibrium module I;
pressure gauges are respectively arranged near the connection point I (81), the connection point II (82), the connection point III (83) and the connection point IV (84);
the second thermodynamic equilibrium module injects thermodynamic equilibrium media into each main process pipeline valve of the main process module through a pipeline system L1, a pipeline system L2, a pipeline system L3, a pipeline system L4 and a pipeline system L5 respectively;
selecting thermodynamic equilibrium media with different temperatures, pressures and types according to system requirements; the thermodynamic equilibrium medium is one of oil, steam, nitrogen and water;
when the main process module controls one of temperature control and pressure control, the thermodynamic equilibrium system (8) provides oil products in one of two states of constant temperature and continuous temperature change as thermodynamic equilibrium media to the main process module according to the requirements of the intelligent control system; one of the following actions is then performed: keeping the set time in the main process module, recycling the waste water to the first thermodynamic equilibrium module for treatment, and directly discharging the waste water from a main process pipeline in the main process module;
when the main process module is cleaned, the thermodynamic equilibrium system (8) provides one of the following three thermodynamic equilibrium media to the main process module according to the requirements of the intelligent control system: oil products with constant temperature and one of two states of continuous temperature change; steam of constant temperature; nitrogen at a constant temperature; one of the following actions is then performed: keeping the set time in the main process module, recycling the waste water to the first thermodynamic equilibrium module for treatment, and directly discharging the waste water from a main process pipeline in the main process module;
when the main process module carries out sealing detection, the thermal balance system (8) provides nitrogen with constant temperature as a thermal balance medium to the main process module according to the requirements of the intelligent control system, keeps set time in the main process module, and is matched with a pressure gauge for detection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821322363.7U CN209909561U (en) | 2018-08-16 | 2018-08-16 | Thermal balance system of pressure reduction system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821322363.7U CN209909561U (en) | 2018-08-16 | 2018-08-16 | Thermal balance system of pressure reduction system |
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| CN209909561U true CN209909561U (en) | 2020-01-07 |
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| CN201821322363.7U Withdrawn - After Issue CN209909561U (en) | 2018-08-16 | 2018-08-16 | Thermal balance system of pressure reduction system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108916652A (en) * | 2018-08-16 | 2018-11-30 | 北京航天石化技术装备工程有限公司 | A kind of thermodynamic equilibrium system of depressurized system |
-
2018
- 2018-08-16 CN CN201821322363.7U patent/CN209909561U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108916652A (en) * | 2018-08-16 | 2018-11-30 | 北京航天石化技术装备工程有限公司 | A kind of thermodynamic equilibrium system of depressurized system |
| CN108916652B (en) * | 2018-08-16 | 2023-11-21 | 北京航天石化技术装备工程有限公司 | Thermodynamic equilibrium system of decompression system |
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