CN111578616A - Circulating water control system for propane dehydrogenation propylene preparation device - Google Patents
Circulating water control system for propane dehydrogenation propylene preparation device Download PDFInfo
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- CN111578616A CN111578616A CN202010411393.0A CN202010411393A CN111578616A CN 111578616 A CN111578616 A CN 111578616A CN 202010411393 A CN202010411393 A CN 202010411393A CN 111578616 A CN111578616 A CN 111578616A
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- circulating water
- cooler
- pipe
- control system
- temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D31/00—Other cooling or freezing apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/06—Walls
- F25D23/062—Walls defining a cabinet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/06—Walls
- F25D23/065—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
Abstract
The invention belongs to the technical field of PDH production process, and particularly relates to a circulating water control system for a propane dehydrogenation propylene preparation device; it includes circulating water pipe network, cooler and compressor; the cooler comprises a tank body, an air inlet pipe and an air outlet pipe, wherein a condensation cavity is coated outside the tank body, the air inlet pipe and the air outlet pipe both penetrate through the condensation cavity and are communicated with the tank body, the air inlet end of the compressor is communicated with the air outlet pipe, and the water inlet and the water outlet of the circulating water pipe network are respectively communicated with the condensation cavity through a water inlet pipe and a water outlet pipe; the drain pipe is provided with a temperature control valve, and the detection end of the temperature control valve is positioned in the air outlet pipe. This circulating water control system is provided with the temperature-sensing valve in the drain pipe department of cooler, and the temperature detection end of this temperature-sensing valve is located the outlet duct department of cooler, and the temperature-sensing valve adjusts its aperture through the temperature that detects the product gas of trachea department to the flow of control circulating water makes the circulating water can by abundant utilization, thereby realizes this circulating water control system's energy-conservation, safe production.
Description
Technical Field
The invention belongs to the technical field of PDH production processes, and particularly relates to a circulating water control system for a propane dehydrogenation propylene preparation device.
Background
The device for preparing Propylene (PDH) by propane dehydrogenation is designed under 100% load, the yield of the device is 60 ten thousand tons of propylene, the process is periodically operated in a high-temperature negative-pressure fixed bed reactor, and partial raw material propane gas is cracked into propylene gas and hydrogen under the action of a catalyst, so that the production of product gas is completed.
The product gas is cooled by the reaction product cooler and then enters a subsequent compression unit, and the compression unit pressurizes the cooled product gas so as to facilitate subsequent process operation; therefore, the compression process of the product gas by the compressor plays an important role in the capacity and the product quality of the propane dehydrogenation propylene preparation device.
In the prior art, a compressor is in continuous three-stage compression, and each stage of discharge needs to be cooled by circulating cooling water through a cooler; in the operation process, the working condition of the device for preparing propylene by propane dehydrogenation changes, and when the flow of circulating water for cooling needs to be adjusted, workers can only adjust the flow through an outlet hand valve of the circulating water of the cooler, so that the production requirement of product gas is ensured, and the good control on the working condition is realized;
however, there are many conditions that affect the working condition change of the device for producing propylene by propane dehydrogenation, including the change of load, the deterioration of the effect of the heat exchanger, the change of the product air temperature of the air inlet, the influence of environmental factors (such as the change of temperature difference between day and night), etc. under the influence of such many factors, the adjustment of the circulating water consumption is more frequent, the speed and timeliness through manual adjustment of the hand valve are relatively poor and the precision is not high, which can cause the waste of a large amount of circulating water. Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide a circulating water control system that reduces the waste of circulating water and improves the utilization rate of circulating water.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a circulating water control system for a propane dehydrogenation propylene preparation device, which aims to solve the technical problems that in the prior art, the waste of circulating water is caused by the slow adjustment speed and low precision of a hand valve, and the utilization rate of the circulating water is low.
The invention is realized by the following technical scheme:
a circulating water control system for a device for preparing propylene by propane dehydrogenation comprises a circulating water pipe network, a cooler and a compressor;
the cooler comprises a tank body, an air inlet pipe and an air outlet pipe, wherein a condensation cavity is coated outside the tank body, the air inlet pipe and the air outlet pipe both penetrate through the condensation cavity and are communicated with the tank body, the air inlet end of the compressor is communicated with the air outlet pipe, and the water inlet and the water outlet of the circulating water pipe network are respectively communicated with the condensation cavity through a water inlet pipe and a water outlet pipe;
the water outlet pipe is provided with a temperature control valve, and the detection end of the temperature control valve is positioned in the air outlet pipe.
In order to better implement the present invention, in the above structure, the circulating water control system further includes a first temperature sensor and a display, the first temperature sensor is disposed in the air inlet pipe, and the first temperature sensor is electrically connected to the display.
In order to better realize the invention, the structure is further optimized, a partition plate is arranged on the inner side wall of the tank body, a cavity is arranged in the partition plate, and the cavity is communicated with the condensation cavity.
In order to better implement the present invention, the structure is further optimized, the number of the partition boards is multiple, and all the partition boards are arranged in a staggered manner.
In order to better implement the invention, the structure is further optimized, and the movable ends of all the partition boards are arranged towards one side of the air outlet pipe in an inclined mode.
In order to better implement the invention, the structure is further optimized, the clapboard is a spiral clapboard, and the outer edge of the clapboard is connected with the inner side wall of the tank body.
In order to better implement the present invention, in the above structure, the circulating water control system further includes a second temperature sensor, the second temperature sensor is disposed in the drain pipe, and the second temperature sensor is also electrically connected to the display.
In order to better realize the invention, the structure is further optimized, and the circulating water control system also comprises a pressure gauge which is arranged on the water discharge pipe and is positioned at the water inlet end of the temperature control valve.
In order to better implement the present invention, the above structure is further optimized, the compressor includes a first-stage compressor, a second-stage compressor, and a third-stage compressor, the cooler includes a first cooler, a second cooler, a third cooler, and a fourth cooler, an air outlet pipe of the first cooler is communicated with an air inlet of the first-stage compressor, the first-stage compressor is communicated with the second-stage compressor through the second cooler, the second-stage compressor is communicated with the third-stage compressor through the third cooler, and an air outlet of the third-stage compressor is communicated with an air inlet pipe of the fourth cooler.
In order to better implement the present invention, the above structure is further optimized, and the number of the first cooler and the second cooler is two.
In summary, the present invention has the following technical effects:
the circulating water control system is provided with the temperature control valve on the drain pipe of the cooler, the temperature detection end of the temperature control valve is positioned at the gas outlet pipe of the cooler, and the opening of the temperature control valve is adjusted by detecting the temperature of the product gas at the gas pipe to control the flow of circulating water, so that the circulating water can be fully utilized, and the energy-saving and safe production of the circulating water control system is realized.
In addition, the optimization scheme of the invention also has the following technical effects:
the optimized scheme of the invention is that the inner side wall of the pipe body is provided with the partition board which can increase the contact area of the product gas and the tank body, so that the heat exchange area of the circulating water and the product gas is increased, and the heat exchange efficiency of the high circulating water and the product gas in the cooler is effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram showing the structure of a cooler in a circulating water control system of a propane dehydrogenation propylene production apparatus according to the first embodiment;
FIG. 2 is a schematic structural diagram of a circulating water control system used in a propane dehydrogenation propylene production apparatus according to the present invention;
fig. 3 is a schematic structural view of a cooler in a circulating water control system used in a propane dehydrogenation propylene production apparatus described in example two.
Reference numerals:
1. a circulating water pipe network; 21. a first cooler; 22. a second cooler; 23. a third cooler; 24. a fourth cooler; 31. a first stage compressor; 32. a secondary compressor; 33. a three-stage compressor; 41. a tank body; 42. an air inlet pipe; 43. an air outlet pipe; 44. a condensation chamber; 5. a temperature control valve; 61. a first temperature sensor; 62. a second temperature sensor; 7. a display; 8. a partition plate; 9. and a pressure gauge.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1 and 2:
a circulating water control system for a device for preparing propylene by propane dehydrogenation comprises a circulating water pipe network 1, a cooler and a compressor;
the cooler comprises a tank body 41, an air inlet pipe 42 and an air outlet pipe 43, a condensation cavity 44 is coated outside the tank body 41, the air inlet pipe 42 and the air outlet pipe 43 both penetrate through the condensation cavity 44 to be communicated with the tank body 41, the air inlet end of the compressor is communicated with the air outlet pipe 43, and the water inlet and the water outlet of the circulating water pipe network 1 are respectively communicated with the condensation cavity 44 through the water inlet pipe and the water outlet pipe;
the drain pipe is provided with a temperature control valve 5, and the detection end of the temperature control valve 5 is positioned in the air outlet pipe 43.
The circulating water control system for the propane dehydrogenation propylene preparation device changes the manual control valve in the original design into the temperature control valve 5; the automatic control of the circulating water flow is realized by the following specific control mode:
when the temperature of the product gas in the gas outlet pipe 43 of the cooler is higher than the preset value, the detection end of the temperature control valve 5 sends temperature information to the temperature control valve 5, the opening degree of the temperature control valve 5 is automatically increased, the flow of circulating water is increased, the circulating water can accelerate the cooling of the product gas, and the temperature of the product gas in the gas outlet pipe 43 of the cooler is reduced, so that the temperature of the product gas reaches the preset value;
when the temperature of the product gas of the outlet pipe 43 of the cooler is lower than the preset value, the detection end of the temperature control valve 5 sends the temperature information to the temperature control valve 5, the opening degree of the temperature control valve 5 can be automatically reduced, the flow of the circulating water is reduced, and the time for the circulating water to stay in the condensation cavity 44 is increased, so that the circulating water is more fully utilized, the temperature of the product gas in the outlet pipe 43 of the cooler is increased, and the temperature of the product gas reaches the preset value.
The opening of the temperature control valve 5 is adjusted by detecting the temperature of the product gas at the gas pipe 43, so that the flow of the circulating water is accurately controlled, the circulating water can be fully utilized, the utilization rate of the circulating water in the circulating water system is improved, and the effects of energy conservation and safe production are achieved.
Optimally, the circulating water control system also comprises a first temperature sensor 61 and a display 7; wherein, the first temperature sensor 61 is arranged in the air inlet pipe 42, and the first temperature sensor 61 is electrically connected with the display 7; this first temperature sensor 61 can detect the temperature of product gas in the intake pipe 42 of cooler to show the numerical value of this temperature through display 7, the staff can learn the temperature of product gas in the intake pipe 42 of cooler through the temperature numerical value that display 7 shows, thereby know this circulating water control system's operating mode more.
Preferably, a partition plate 8 is disposed on the inner side wall of the tank 41, a cavity is disposed in the partition plate 8, and the cavity is communicated with the condensation cavity 44; after the cooling water enters the condensation cavity 44, the cooling water can exchange heat with the product gas in the tank 41 in a heat transfer mode, and the arrangement of the partition plate 8 can increase the heat exchange area between the product gas and the circulating water, so that the heat exchange efficiency between the circulating water and the product gas in the cooler is improved.
Preferably, the number of the partition plates 8 is plural, and all the partition plates 8 are arranged in a staggered manner; the arrangement mode can increase the moving path of the product gas in the tank 41, namely, the moving time of the product gas in the tank 41, thereby further improving the heat exchange efficiency of the circulating water and the product gas in the cooler.
More preferably, the partition 8 is disposed obliquely.
Specifically, the one end of baffle 8 is fixed on the inside wall of jar body 41, and the one end that baffle 8 and jar body 41 are connected is then the stiff end, and the one end that baffle 8 kept away from the stiff end is then the expansion end, and this expansion end is towards the one side slope of outlet duct 43, makes this baffle 8 can not hinder the removal of product gas, and makes product gas remove more smoothly in jar body 41.
Preferably, the circulating water control system further comprises a second temperature sensor 62, the second temperature sensor 62 is arranged in the drain pipe, and the second temperature sensor 62 is also electrically connected with the display 7;
the second temperature sensor 62 may be used to detect the temperature of the circulating water at the outlet of the cooler and display the value of this temperature via the display 7.
Preferably, the circulating water control system further comprises a pressure gauge 9, the pressure gauge 9 is arranged on the drain pipe, the pressure gauge 9 is positioned at the water inlet end of the temperature control valve 5, and the pressure gauge 9 can detect the pressure of circulating water on the drain pipe; through the pressure value and the temperature value of the drain pipe of the cooler detected by the pressure gauge 9 and the second temperature sensor 62, the worker judges whether the circulating water control system is in the normal working condition or not through the detected pressure value and temperature value, so that the safe production of the circulating water system is realized.
Preferably, the compressor includes a first compressor 31, a second compressor 32 and a third compressor 33, and the cooler includes a first cooler 21, a second cooler 22, a third cooler 23 and a fourth cooler 24; wherein the content of the first and second substances,
an air outlet pipe 43 of the first cooler 21 is communicated with an air inlet end of the first-stage compressor 31, an air outlet end of the first-stage compressor 31 is communicated with an air inlet pipe 42 of the second cooler 22, an air outlet pipe 43 of the second cooler 22 is communicated with an air inlet end of the second-stage compressor 32, an air outlet end of the second-stage compressor 32 is communicated with an air inlet pipe 42 of the third cooler 23, an air outlet pipe 43 of the third cooler 23 is communicated with an air inlet end of the third-stage compressor 33, and an air outlet end of the third-stage compressor 33 is communicated with an air inlet pipe 42 of the fourth cooler 24; the arrangement mode of the cooler and the compressor can effectively improve the quality and the capacity of the product gas.
In the working process, high-temperature (152 ℃) product gas enters the first cooler 21 through the gas inlet pipe 42 of the first cooler 21, the product gas is cooled and cooled in the first cooler 21, the temperature of the product gas is reduced to 44 ℃, the cooled product gas enters the primary compressor 1 through the gas outlet pipe 43 of the first cooler 21, and the primary compressor 31 compresses the product gas; at this time, after the product gas is compressed, the temperature of the product gas is raised to 121 ℃;
then, the product gas compressed in the primary compressor 31 passes through the gas inlet pipe 42 of the second cooler 22 and is cooled in the second cooler 22, so that the temperature of the product gas is reduced to 44 ℃; the cooled product gas enters the secondary compressor 32 through the gas outlet pipe 43 of the second cooler 22, the secondary compressor 32 can re-compress the product gas, the temperature of the product gas can also rise to 123 ℃, and the re-compressed product gas can enter the third cooler 23 through the gas inlet pipe 42 of the third cooler 23;
the third cooler 23 can lower the temperature of the product gas to 44 ℃, and lead the cooled product gas to the third-stage compressor 33, the third-stage compressor 33 can compress the product gas again, the temperature of the product gas can also increase to 123 ℃, and the compressed product gas enters the fourth cooler 24 through the air inlet pipe 42 of the fourth cooler 24, and the cooler can lower the temperature of the product gas to 44 ℃ and lead the product gas to the subsequent equipment to complete the production of the subsequent process.
It should be noted that, the value of the temperature of the product gas is a set value, and there is a certain error in the actual production process, and the error range is ± 5 ℃.
Preferably, the number of the first cooler 21 and the second cooler 22 is two, so as to improve the cooling efficiency of the product gas.
Example two:
as shown in fig. 2 and 3:
as another embodiment of the present invention, the above-mentioned partition plate 8 may be a spiral structure, the outer edge of the spiral partition plate 8 is connected to the inner side wall of the tank 41, the product gas can enter the tank 41 through the air inlet pipe 42 of the cooler and move to the air outlet pipe 43 of the cooler along the spiral partition plate 8, the spiral partition plate 8 can effectively increase the heat exchange area between the product gas and the circulating water, and can increase the moving distance of the product gas in the tank 41, thereby effectively improving the cooling effect of the cooler.
In addition, other structures of the circulating water control system are completely the same as those of the circulating water control system described in the first embodiment, and specific reference may be made to the first embodiment, and repeated description is omitted here.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A circulating water control system for a propane dehydrogenation propylene preparation device is characterized in that: comprises a circulating water pipe network (1), a cooler and a compressor;
the cooler comprises a tank body (41), an air inlet pipe (42) and an air outlet pipe (43), a condensation cavity (44) is coated outside the tank body (41), the air inlet pipe (42) and the air outlet pipe (43) penetrate through the condensation cavity (44) and are communicated with the tank body (41), the air inlet end of the compressor is communicated with the air outlet pipe (43), and the water inlet and the water outlet of the circulating water pipe network (1) are communicated with the condensation cavity (44) through a water inlet pipe and a water outlet pipe respectively;
the water outlet pipe is provided with a temperature control valve (5), and the detection end of the temperature control valve (5) is positioned in the air outlet pipe (43).
2. The circulating water control system of claim 1, wherein: the air inlet pipe is characterized by further comprising a first temperature sensor (61) and a display (7), wherein the first temperature sensor (61) is arranged in the air inlet pipe (42), and the first temperature sensor (61) is electrically connected with the display (7).
3. The circulating water control system of claim 2, wherein: a partition plate (8) is arranged on the inner side wall of the tank body (41), a cavity is arranged in the partition plate (8), and the cavity is communicated with the condensation cavity (44).
4. The circulating water control system of claim 3, wherein: the number of the partition boards (8) is multiple, and all the partition boards (8) are arranged in a mutually staggered mode.
5. The circulating water control system of claim 4, wherein: the movable ends of all the partition plates (8) are obliquely arranged towards one side of the air outlet pipe (43).
6. The circulating water control system of claim 3, wherein: the baffle (8) is a spiral baffle (8), and the outer edge of the baffle (8) is connected with the inner side wall of the tank body (41).
7. The circulating water control system according to any one of claims 2 to 6, wherein: the water drain pipe also comprises a second temperature sensor (62), wherein the second temperature sensor (62) is arranged in the water drain pipe, and the second temperature sensor (62) is also electrically connected with the display (7).
8. The circulating water control system of claim 1, wherein: still include manometer (9), manometer (9) set up on the drain pipe, just manometer (9) are located the end of intaking of temperature-sensing valve (5).
9. The circulating water control system of claim 1, wherein: the compressor comprises a first-stage compressor (31), a second-stage compressor (32) and a third-stage compressor (33), the coolers comprise a first cooler (21), a second cooler (22), a third cooler (23) and a fourth cooler (24), an air outlet pipe (43) of the first cooler (21) is communicated with an air inlet of the first-stage compressor (31), the first-stage compressor (31) is communicated with the second-stage compressor (32) through the second cooler (22), the second-stage compressor (32) is communicated with the third-stage compressor (23) through the third cooler (33), an air outlet of the third-stage compressor (33) is communicated with an air inlet pipe (42) of the fourth cooler (24).
10. The circulating water control system of claim 9, wherein: the number of the first cooler (21) and the second cooler (22) is two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010411393.0A CN111578616A (en) | 2020-05-15 | 2020-05-15 | Circulating water control system for propane dehydrogenation propylene preparation device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010411393.0A CN111578616A (en) | 2020-05-15 | 2020-05-15 | Circulating water control system for propane dehydrogenation propylene preparation device |
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| CN111578616A true CN111578616A (en) | 2020-08-25 |
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| CN202010411393.0A Pending CN111578616A (en) | 2020-05-15 | 2020-05-15 | Circulating water control system for propane dehydrogenation propylene preparation device |
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2020
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| CN203990611U (en) * | 2014-07-01 | 2014-12-10 | 江苏佳尔利装饰材料有限公司 | Paint stirring reactor |
| CN204952328U (en) * | 2015-08-19 | 2016-01-13 | 江西禾益化工股份有限公司 | Jar is retrieved to rectification vacuum buffering |
| CN205287684U (en) * | 2015-12-30 | 2016-06-08 | 苏州双象光学材料有限公司 | Gaseous condensation recovery device |
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Application publication date: 20200825 |
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