CN109084178A - A kind of energy comprehensive utilization system applied between power plant and gas distributing system - Google Patents
A kind of energy comprehensive utilization system applied between power plant and gas distributing system Download PDFInfo
- Publication number
- CN109084178A CN109084178A CN201811196733.1A CN201811196733A CN109084178A CN 109084178 A CN109084178 A CN 109084178A CN 201811196733 A CN201811196733 A CN 201811196733A CN 109084178 A CN109084178 A CN 109084178A
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- gas
- outlet
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- inlet
- distributing system
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- 239000007789 gas Substances 0.000 claims abstract description 118
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 106
- 239000003345 natural gas Substances 0.000 claims abstract description 54
- 239000000498 cooling water Substances 0.000 claims abstract description 36
- 230000001105 regulatory effect Effects 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims description 59
- 239000007788 liquid Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 8
- 239000002826 coolant Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000005611 electricity Effects 0.000 abstract description 4
- 230000006837 decompression Effects 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 abstract 1
- 239000002351 wastewater Substances 0.000 description 7
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009711 regulatory function Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The present invention relates to a kind of energy comprehensive utilization systems applied between power plant and gas distributing system, belong to comprehensive utilization of energy technical field, solve the problems, such as that natural gas is entered that the pressure energy that voltage regulating station is wasted is not utilized and the problem of source in order to guarantee thermal energy needed for natural gas enters the temperature of voltage regulating station, specifically include: unused pressure energy is converted into electric energy and drives power generator to generate electricity by tooth connection roller box by turbo-expander as high pressure pipe network.Present invention utilizes enclosed cooling waters in power plant, the natural gas entered by natural gas main line is preheated, cooling for enclosed cooling water provides cold energy, the pressure difference between gas distributing system and voltage regulating station is utilized simultaneously, the non-power generator of pressure difference is generated electricity by turbo-expander, natural gas temperature after decompression reduces, and is heated using the cold source of condenser heat exchanger for it, while providing cold energy for condenser cold source.
Description
Technical field
The present invention relates to comprehensive utilization of energy technical fields, more particularly to one kind to be applied between power plant and gas distributing system
Energy comprehensive utilization system.
Background technique
The long distance pipeline of natural gas needs very high pressure, substantially all in 10Mpa or so, the natural gas pressure regulating of each department
It stands, supplies the pressure requirements of downstream user in 4Mpa or so, natural gas enters voltage regulating station from high pressure pipe network and is depressured, day
Right gas releases a large amount of pressure energy, the pressure of general natural gas pressure regulating station setting decompression by-passing part reduction during pressure regulation
Power, this portion of energy are not utilized, cause the waste of energy, cannot be efficiently used, and not can be carried out the recycling of cold energy,
Further needing exist for heat source is the natural gas temperature that heated by natural gas guarantees voltage regulating station, and energy consumption is big.
Summary of the invention
Enter the pressure energy that voltage regulating station is wasted by high pressure pipe network the purpose of the present invention is to solve natural gas not obtain
The problem of to the problem of utilization and source in order to guarantee thermal energy needed for natural gas enters the temperature of voltage regulating station, and then provide
A kind of energy comprehensive utilization system applied between power plant and gas distributing system.
Technical solution of the present invention:
A kind of energy comprehensive utilization system applied between power plant and gas distributing system, comprising: gas distributing system air inlet
Pipeline, No.1 heating device, No.1 flowmeter, fast valve, No.1 pressure reducing valve, No. two heating devices, gas distributing system escape pipe
Road, natural gas pressure regulating station, No. three heating devices, No. two pressure reducing valves, No. two flowmeters, turbo-expander, gear-box and power plant's hair
Motor,
One end of the gas distributing system air inlet pipeline is connected with natural gas main line, and gas distributing system air inlet pipeline is another
End is connected with the gas inlet of the gas inlet of No.1 heating device and No. two flowmeters respectively by connecting line, No.1
The gas outlet of heating device is connected by connecting line with the gas inlet of No.1 flowmeter, No.1 flowmeter it is natural
Gas outlet is connected with the gas inlet of the gas inlet of fast valve and turbo-expander respectively by connecting line, fast valve
Gas outlet be connected with the gas inlet of No.1 pressure reducing valve by connecting line, the outlet of No.1 pressure reducing valve passes through connection
Pipeline is connected with the gas inlet of No. two heating devices, and No. two heating device gas outlets pass through connecting line and natural gas
Pipe network outlet pipe one end is connected, the gas distributing system outlet pipe other end and the natural gas main line phase in natural gas pressure regulating station
Even；
The gas outlet of the turbo-expander is connected by connecting line with the gas inlet of No. two heating devices,
The output end of turbo-expander is connected with the input terminal of gear-box, and the output end of gear-box is connected with power generator input terminal；
The gas outlet of No. two flowmeters is connected by connecting line with No. two decompression valve inlets, No. two pressure reducing valves
Gas outlet be connected with No. three heating device gas inlets by connecting line, No. three heating device gas outlets lead to
Connecting line is crossed to be connected with gas distributing system outlet pipe one end.
Further, the No.1 heating device includes: No.1 heat exchanger, the cooling water circulation pipe of enclosed and No.1 drainpipe
Road, the gas distributing system air inlet pipeline other end are connected by connecting line with No.1 heat exchanger gas inlet, and No.1 is changed
The gas outlet of hot device is connected by connecting line with the gas inlet of No.1 flowmeter, the liquid medium of No.1 heat exchanger
Entrance is connected with enclosed cooling water pipeline, and the liquid medium outlet of No.1 heat exchanger is connected with No.1 discharge pipe line.
Further, No. two heating devices include: No. two heat exchangers, condenser, No. two discharge pipe lines, cooling water input
Pipeline, steam-turbine pipeline and No. three discharge pipe lines, the gas outlet of the No.1 pressure reducing valve and the day of turbo-expander
Right gas outlet is connected by connecting line with the gas inlet of No. two heat exchangers, and the gas outlet of No. two heat exchangers passes through
Connecting line is connected with gas distributing system outlet pipe one end, and liquid medium inlet and the condenser cooling water of No. two heat exchangers go out
Mouth is connected, and the liquid medium outlet of No. two heat exchangers is connected with No. two discharge pipe lines, the cooling water inlet of condenser and cooling water
Intake line is connected, and condenser steam inlet is connected with steam-turbine pipeline, condenser steam (vapor) outlet and No. three discharge pipe lines
It is connected.
Further, No. three heating devices include: No. two heat exchangers, condenser, No. two discharge pipe lines, cooling water input
The gas outlet of pipeline, steam-turbine pipeline and No. three discharge pipe lines, No. two pressure reducing valves passes through connecting line and two
The gas inlet of number heat exchanger is connected, and the gas outlet of No. two heat exchangers passes through connecting line and gas distributing system escape pipe
Road one end is connected, and the liquid medium inlet of No. two heat exchangers is connected with condenser cooling water outlet, and the liquid of No. two heat exchangers is situated between
Matter outlet is connected with No. two discharge pipe lines, and the cooling water inlet of condenser is connected with coolant intake pipe road, and condenser steam enters
Mouth is connected with steam-turbine pipeline, and condenser steam (vapor) outlet is connected with No. three discharge pipe lines.
Further, No. three heating devices another kind heating method is water-bath stove heating.
Further, shut-off valve is provided on the connecting line.
The invention has the following advantages:
Pressure energy is used for electricity by turbo-expander using the pressure difference between gas distributing system and voltage regulating station by the present invention
Pressure energy is converted to electric energy, exported into Station Service Electrical-Energy system, while turbo-expander converting electrical energy by factory's electrical power generators
The cold energy that natural gas generates in the process, provides cold source for power plant, cold energy is stored in natural gas, the low natural gas not up to standard of temperature
It cannot be fed directly to voltage regulating station, the cold energy in natural gas need to be passed into cooling water by No. two heat exchangers by heating, electricity
Steam-turbine in factory is heated up low-temperature cooling water by condenser again, and the cooling water after heating again can be for cold energy
Natural gas heating, finally pressure energy is converted for electric energy, the thermal energy of the cold energy and steam turbine that generate in conversion process is logical
Supercooled water, which realizes, to be recycled, while present invention utilizes the hot waste waters of boiler in power plant, to by natural gas main line
The natural gas of entrance is preheated, since boiler high temperature wastewater flow rate is less in power plant, so preheating for natural gas, thus pot
Thermal energy in furnace hot waste water is utilized.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention one；
Fig. 2 is the structural schematic diagram of the embodiment of the present invention four.
Specific embodiment
Below with reference to attached drawing, the present invention is described in detail.
A kind of embodiment one: energy comprehensive utilization system applied between power plant and gas distributing system, comprising: natural gas
Pipe network air inlet pipeline 1, No.1 heating device 2, No.1 flowmeter 3, fast valve 4, No.1 pressure reducing valve 5, No. two heating devices 6, day
Right gas pipe network outlet pipe 7, natural gas pressure regulating station 8, three heating device 9, two pressure reducing valve 10, two flowmeter 11, turbine
Expanding machine 12, gear-box 13 and power generator 14,
One end of the gas distributing system air inlet pipeline 1 is connected with natural gas main line, and gas distributing system air inlet pipeline 1 is another
One end passes through the connecting line gas inlet phase with the gas inlet of No.1 heating device 2 and No. two flowmeters 11 respectively
Even, the gas outlet of No.1 heating device 2 is connected by connecting line with the gas inlet of No.1 flowmeter 3, No.1 stream
The gas outlet of meter 3 passes through the connecting line natural gas with the gas inlet of fast valve 4 and turbo-expander 12 respectively
Entrance is connected, and the gas outlet of fast valve 4 is connected by connecting line with the gas inlet of No.1 pressure reducing valve 5, and No.1 subtracts
The outlet of pressure valve 5 is connected by connecting line with the gas inlet of No. two heating devices 6, and No. two 6 natural gases of heating device go out
Mouth is connected by connecting line with 7 one end of gas distributing system outlet pipe, 7 other end of gas distributing system outlet pipe and natural gas
Natural gas main line in voltage regulating station 8 is connected；
The gas outlet of the turbo-expander 12 passes through the gas inlet phase of connecting line and No. two heating devices 6
Even, the output end of turbo-expander 12 is connected with the input terminal of gear-box 13, the output end and power generator 14 of gear-box 13
Input terminal is connected；
The gas outlet of No. two flowmeters 11 is connected by connecting line with No. two 10 entrances of pressure reducing valve, and No. two subtract
The gas outlet of pressure valve 10 is connected by connecting line with No. three 9 gas inlets of heating device, and No. three heating devices 9 are natural
Gas outlet is connected by connecting line with 7 one end of gas distributing system outlet pipe, so set, using gas distributing system and naturally
Pressure difference between gas voltage regulating station 8 drives power generator power generation 14, sufficiently benefit by 12 tooth connection roller box 13 of turbo-expander
With pressure energy, pressure energy is converted to electric energy.
Embodiment two: the No.1 heating device 2 includes: No.1 heat exchanger 21, enclosed cooling water pipeline 22 and No.1 row
Water lines 23,1 other end of gas distributing system air inlet pipeline pass through connecting line and 21 gas inlet phase of No.1 heat exchanger
Even, the gas outlet of No.1 heat exchanger 21 is connected by connecting line with the gas inlet of No.1 flowmeter 3, No.1 heat exchange
The liquid medium inlet of device 21 is connected with enclosed cooling water pipeline 22, and liquid medium outlet and the No.1 of No.1 heat exchanger 21 drain
Pipeline 23 is connected, so set, enclosed cooling water pipeline 22 is connected with boiler factory's hot waste water pipeline is utilized boiler in power plant
Hot waste water, the natural gas entered by natural gas main line is preheated, due in power plant boiler high temperature wastewater flow rate compared with
It is few, so being preheated for natural gas, so that the thermal energy in boiler high temperature waste water is utilized.
Embodiment three: No. two heating devices 6 include: No. two heat exchangers 61,62, No. two discharge pipe lines 63 of condenser,
Coolant intake pipe road 64, steam-turbine pipeline 65 and No. three discharge pipe lines 66, the gas outlet of the No.1 pressure reducing valve 5
Pass through connecting line with the gas outlet of turbo-expander 12 to be connected with the gas inlet of No. two heat exchangers 61, No. two are changed
The gas outlet of hot device 61 is connected by connecting line with 7 one end of gas distributing system outlet pipe, the liquid of No. two heat exchangers 61
Body medium inlet is connected with 62 cooling water outlet of condenser, liquid medium outlet and No. two discharge pipe lines 63 of No. two heat exchangers 61
It is connected, the cooling water inlet of condenser 62 is connected with coolant intake pipe road 64,62 steam inlet of condenser and steam-turbine
Pipeline 65 is connected, and 62 steam (vapor) outlet of condenser is connected with No. three discharge pipe lines 66, so set, using generating in pressure reduction
Cold energy provides cold source for power plant, and cold energy is stored in natural gas, and the low natural gas not up to standard of temperature cannot be fed directly to pressure regulation
It stands, the cold energy in natural gas need to be passed into cooling water by No. two heat exchangers, low-temperature cooling water passes through condenser by heating
Steam-turbine in power plant is heated up again, the cooling water after heating can be again the natural gas heating with cold energy, finally
Pressure energy is converted for electric energy, the thermal energy of the cold energy and steam turbine that generate in conversion process realizes circulation by cooling water
It utilizes.
Example IV: No. three heating devices 9 include: No. two heat exchangers 61,62, No. two discharge pipe lines 63 of condenser,
Coolant intake pipe road 64, steam-turbine pipeline 65 and No. three discharge pipe lines 66, the natural gas of No. two pressure reducing valves 10 go out
Mouth is connected by connecting line with the gas inlet of No. two heat exchangers 61, and the gas outlet of No. two heat exchangers 61 passes through connection
Pipeline is connected with 7 one end of gas distributing system outlet pipe, the liquid medium inlet and 62 cooling water of condenser of No. two heat exchangers 61
Outlet is connected, and the liquid medium outlet of No. two heat exchangers 61 is connected with No. two discharge pipe lines 63, the cooling water inlet of condenser 62
It is connected with coolant intake pipe road 64,62 steam inlet of condenser is connected with steam-turbine pipeline 65, and 62 steam of condenser goes out
Mouth is connected with No. three discharge pipe lines 66, so set, providing cold source, cold energy using the cold energy generated in pressure reduction for power plant
It is stored in natural gas, the low natural gas not up to standard of temperature cannot be fed directly to voltage regulating station, need to be changed by heating by No. two
Cold energy in natural gas is passed to cooling water by hot device 61, and the steam-turbine in power plant passes through condenser 62 for low-temperature cooling water
It heats up again, the cooling water after heating can be again the natural gas heating with cold energy；The cold energy that is generated in conversion process with
The thermal energy of steam turbine is realized by cooling water to be recycled.
Embodiment five: another heating method of No. three heating devices 9 is water-bath stove heating.
Embodiment six: shut-off valve 15 is provided on the connecting line.
The No.1 heat exchanger 21 and No. two heat exchangers 61 are enclosed cooling water heat exchanger, and fast valve 4 is to rapidly switch off
Valve has quickly cutting and regulatory function, and swift switch time 3S, 4~20mA of valve signal are into control room.
The energy wasted in power plant is used for No.1 heating device 2 and No. two heating devices 6, promotes whole system
Energy utilization rate be improved.
Claims (6)
1. a kind of energy comprehensive utilization system applied between power plant and gas distributing system, comprising: gas distributing system air inlet pipe
Road (1), No.1 heating device (2), No.1 flowmeter (3), fast valve (4), No.1 pressure reducing valve (5), No. two heating devices (6),
Gas distributing system outlet pipe (7), natural gas pressure regulating station (8), No. three heating devices (9), No. two pressure reducing valves (10), No. two flows
Count (11), turbo-expander (12), gear-box (13) and power generator (14), which is characterized in that
One end of the gas distributing system air inlet pipeline (1) is connected with natural gas main line, and gas distributing system air inlet pipeline (1) is another
One end passes through the connecting line gas inlet with the gas inlet of No.1 heating device (2) and No. two flowmeters (11) respectively
It is connected, the gas outlet of No.1 heating device (2) is connected by connecting line with the gas inlet of No.1 flowmeter (3),
The gas outlet of No.1 flowmeter (3) passes through the connecting line gas inlet and turbo-expander with fast valve (4) respectively
(12) gas inlet is connected, and the gas outlet of fast valve (4) passes through the natural gas of connecting line and No.1 pressure reducing valve (5)
Entrance is connected, and the outlet of No.1 pressure reducing valve (5) is connected by connecting line with the gas inlet of No. two heating devices (6), and two
Number heating device (6) gas outlet is connected by connecting line with gas distributing system outlet pipe (7) one end, gas distributing system
Outlet pipe (7) other end is connected with the natural gas main line in natural gas pressure regulating station (8)；
The gas outlet of the turbo-expander (12) passes through the gas inlet phase of connecting line and No. two heating devices (6)
Even, the output end of turbo-expander (12) is connected with the input terminal of gear-box (13), and the output end of gear-box (13) and power plant are sent out
Motor (14) input terminal is connected；
The gas outlet of No. two flowmeters (11) is connected by connecting line with No. two pressure reducing valve (10) entrances, and No. two subtract
The gas outlet of pressure valve (10) is connected by connecting line with No. three heating device (9) gas inlets, No. three heating devices
(9) gas outlet is connected by connecting line with gas distributing system outlet pipe (7) one end.
2. a kind of energy comprehensive utilization system applied between power plant and gas distributing system according to claim 1, special
Sign is that the No.1 heating device (2) includes: No.1 heat exchanger (21), enclosed cooling water pipeline (22) and No.1 drainpipe
Road (23), gas distributing system air inlet pipeline (1) other end pass through connecting line and No.1 heat exchanger (21) gas inlet
It is connected, the gas outlet of No.1 heat exchanger (21) is connected by connecting line with the gas inlet of No.1 flowmeter (3), and one
The liquid medium inlet of number heat exchanger (21) is connected with enclosed cooling water pipeline (22), and the liquid medium of No.1 heat exchanger (21) goes out
Mouth is connected with No.1 discharge pipe line (23).
3. a kind of energy comprehensive utilization system applied between power plant and gas distributing system according to claim 1, special
Sign is, No. two heating devices (6) include: No. two heat exchangers (61), condenser (62), No. two discharge pipe lines (63), cold
But water input conduit (64), steam-turbine pipeline (65) and No. three discharge pipe lines (66), the No.1 pressure reducing valve (5) it is natural
Gas outlet passes through the gas inlet of connecting line and No. two heat exchangers (61) with the gas outlet of turbo-expander (12)
It is connected, the gas outlet of No. two heat exchangers (61) is connected by connecting line with gas distributing system outlet pipe (7) one end, and two
The liquid medium inlet of number heat exchanger (61) is connected with condenser (62) cooling water outlet, the liquid medium of No. two heat exchangers (61)
Outlet is connected with No. two discharge pipe lines (63), and the cooling water inlet of condenser (62) is connected with coolant intake pipe road (64), coagulates
Vapour device (62) steam inlet is connected with steam-turbine pipeline (65), condenser (62) steam (vapor) outlet and No. three discharge pipe lines (66)
It is connected.
4. a kind of energy comprehensive utilization system applied between power plant and gas distributing system according to claim 1, special
Sign is, No. three heating devices (9) include: No. two heat exchangers (61), condenser (62), No. two discharge pipe lines (63), cold
But water input conduit (64), steam-turbine pipeline (65) and No. three discharge pipe lines (66), the day of No. two pressure reducing valves (10)
Right gas outlet is connected by connecting line with the gas inlet of No. two heat exchangers (61), and the natural gas of No. two heat exchangers (61) goes out
Mouthful be connected with gas distributing system outlet pipe (7) one end by connecting line, the liquid medium inlet of No. two heat exchangers (61) and
Condenser (62) cooling water outlet is connected, and the liquid medium outlet of No. two heat exchangers (61) is connected with No. two discharge pipe lines (63),
The cooling water inlet of condenser (62) is connected with coolant intake pipe road (64), condenser (62) steam inlet and steam-turbine
Pipeline (65) is connected, and condenser (62) steam (vapor) outlet is connected with No. three discharge pipe lines (66).
5. a kind of energy comprehensive utilization system applied between power plant and gas distributing system according to claim 1, special
Sign is that another heating method of No. three heating devices (9) is water-bath stove heating.
6. a kind of energy comprehensive utilization system applied between power plant and gas distributing system according to claim 1, special
Sign is, shut-off valve (15) are provided on the connecting line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811196733.1A CN109084178A (en) | 2018-10-15 | 2018-10-15 | A kind of energy comprehensive utilization system applied between power plant and gas distributing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811196733.1A CN109084178A (en) | 2018-10-15 | 2018-10-15 | A kind of energy comprehensive utilization system applied between power plant and gas distributing system |
Publications (1)
| Publication Number | Publication Date |
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| CN109084178A true CN109084178A (en) | 2018-12-25 |
Family
ID=64843409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201811196733.1A Pending CN109084178A (en) | 2018-10-15 | 2018-10-15 | A kind of energy comprehensive utilization system applied between power plant and gas distributing system |
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| CN107013271A (en) * | 2017-04-28 | 2017-08-04 | 申能股份有限公司 | Natural gas power complementary energy synthesis utilizes system |
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| CN108518584A (en) * | 2018-03-14 | 2018-09-11 | 浙江大学宁波理工学院 | A kind of high-pressure natural gas pipe network pressure energy recycling system |
| CN208779138U (en) * | 2018-10-15 | 2019-04-23 | 哈尔滨电气股份有限公司 | A kind of energy comprehensive utilization system applied between power plant and gas distributing system |
-
2018
- 2018-10-15 CN CN201811196733.1A patent/CN109084178A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203907223U (en) * | 2014-06-09 | 2014-10-29 | 中国科学院工程热物理研究所 | Natural gas gate station energy comprehensive utilization system with controllable air amount |
| CN205370657U (en) * | 2016-01-19 | 2016-07-06 | 碧海舟（北京）节能环保装备有限公司 | A power generation system and natural gas pressure regulating system for natural gas decompression measuring station |
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Application publication date: 20181225 |