CN213335626U - Leading vacuum pumping system that thoughtlessly congeals of forced-ventilated formula - Google Patents

Leading vacuum pumping system that thoughtlessly congeals of forced-ventilated formula Download PDF

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Publication number
CN213335626U
CN213335626U CN202021712796.0U CN202021712796U CN213335626U CN 213335626 U CN213335626 U CN 213335626U CN 202021712796 U CN202021712796 U CN 202021712796U CN 213335626 U CN213335626 U CN 213335626U
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gas
water
condenser
vacuum
pipeline
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桂本
闵山山
宋丹
刘平
李文权
郑良栋
杜晨
张春琳
仇晓龙
祝培旺
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China Power Engineering Consultant Group Central Southern China Electric Power Design Institute Corp
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China Power Engineering Consultant Group Central Southern China Electric Power Design Institute Corp
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Abstract

The utility model discloses a forced-ventilated type preposed coagulation vacuum-pumping system, a first gas-water outlet (1.1) arranged at the top of a condenser (1) is connected with a gas-water inlet (2.1) arranged at one side of a preposed coagulation device (2) through a pipeline, a second gas-water outlet (2.3) arranged at the top of the preposed coagulation device (2) is connected with one end of a gas inlet pipe (3.1) arranged in a vacuum pump set (3) through a pipeline; the other end of the air inlet pipe (3.1) is connected with a vacuum pump body (3.2), and one side of the vacuum pump body (3.2) is connected with a gas-water separator (3.4) through a pipeline; the condenser overcomes the defects that a preposed condensing device in the prior art is directly connected with external atmosphere to cause air leakage risk of the condenser and the vacuum of the condenser is more difficult to maintain, and has the advantages that the air flows back to the condenser in a forced drainage mode through a drainage pump and the resource is recycled.

Description

Leading vacuum pumping system that thoughtlessly congeals of forced-ventilated formula
Technical Field
The utility model relates to energy, chemical industry technical research field, more specifically are leading evacuation system that thoughtlessly congeals of formula of forcing to arrange.
Background
The boiler heats water into high-temperature steam, the steam is sent to a steam turbine generator to do work and generate power, and the steam after doing work is condensed into water through a condenser; the process is a typical steam-water circulation flow of the coal-fired power plant.
Wherein, the higher the steam parameter, the lower the pressure in the condenser, the more the work is done in the whole cycle process, and the higher the efficiency. When the boiler parameters are fixed, how to maintain the vacuum of the condenser is the key for improving the power generation efficiency of the coal-fired power plant.
In northwest areas of China, most coal-fired power plants operate in an indirect air cooling mode or a direct air cooling mode due to the limitation of water sources at the locations.
For direct or indirect air cooling power stations, the condenser has low cooling efficiency and low vacuum degree, and contains a large amount of non-condensable gas.
Therefore, there is a high necessity for a device to solve the above problems.
Disclosure of Invention
The utility model aims to overcome the shortcomings of the background art and provide a forced-ventilated formula leading vacuum pumping system that congeals.
The utility model aims at being implemented through the following technical scheme: a forced-ventilated type preposed coagulation vacuum-pumping system comprises a condenser, a preposed coagulation device, a vacuum pump group, a drainage pump, a vacuum stop valve, a U-shaped bent pipe and a condensed water structure;
a first gas-water outlet arranged at the top of the condenser is connected with a gas-water inlet arranged at one side of the pre-coagulation device through a pipeline, and a second gas-water outlet arranged at the top of the pre-coagulation device is connected with one end of a gas inlet pipe arranged in the vacuum pump set through a pipeline;
the other end of the air inlet pipe is connected with a vacuum pump body, and one side of the vacuum pump body is connected with a gas-water separator through a pipeline; the other end of the gas-water separator is connected with the plate heat exchanger through a pipeline, and return water in the plate heat exchanger is communicated with one side of the vacuum pump body through a pipeline;
the working fluid overflow port arranged at the bottom of the gas-water separator is connected with the working fluid return port arranged at the bottom of the condenser through a pipeline; the condensed liquid outlet arranged at the bottom of the pre-coagulation device is connected with the inlet of the drainage pump through a pipeline;
and an outlet of the draining pump is connected with a condensate return port arranged on the condenser through a pipeline.
In the above technical scheme: a vacuum stop valve and a U-shaped bent pipe are arranged on a pipeline between the condensed liquid outlet and the condensed liquid water return port on one side close to the condenser; and a vacuum stop valve and a U-shaped bent pipe are arranged on a pipeline between the working liquid overflow port and the water return port.
In the above technical scheme: and the outlet of the pipeline connected with each first gas-water outlet is provided with a vacuum stop valve.
In the above technical scheme: the condenser comprises a plurality of gas-water outlets arranged at the top, a mixed condensate return port and a working liquid return port arranged at the bottom;
the lower part of one side of the pre-coagulation device is provided with a gas-water inlet, the upper part of the other side of the pre-coagulation device is provided with a condensed water spraying inlet, and the condensed water spraying inlet is communicated with an external condensed water structure; the top of the pre-coagulation device is provided with a second gas-water outlet, and the bottom of the pre-coagulation device is provided with a coagulation liquid outlet;
the vacuum pump set is provided with an air inlet pipe, a vacuum pump body, a plate type heat exchanger, a gas-water separator and a motor; the output end of the motor is connected with the vacuum pump body;
the top of the gas-water separator is provided with an exhaust port which is communicated with the atmosphere, and the bottom of the gas-water separator is provided with a working fluid overflow port.
In the above technical scheme: the condenser is arranged at the deep pit of the main plant, and the preposed mixing condenser, the vacuum pump group and the drainage pump are all arranged on the 0m layer of the main plant.
The utility model has the advantages of as follows: 1. the utility model provides a gas-water mixture and condensate water its temperature reduction, water content reduce, promoted the dry air efficiency of taking out of follow-up vacuum pump after the heat transfer in leading coagulation ware.
2. The utility model provides a liquid after the heat transfer in the leading coagulation ware, the mode through drain pump forced drainage flows back extremely the condenser, overcome the pipeline resistance along the way, realized the resource recycle.
3. The utility model discloses well working solution return water is the same to be reinjected to the further saving working water of condenser.
4. The utility model discloses the relevant pipeline of well backward flow to the condensate return water of condenser and working solution return water all is provided with U type return bend near the condenser end, and its water seal effect can prevent that the air from leaking into to the condenser.
5. The comprehensive calculation result shows that compared with the related system of the conventional indirect or direct air cooling unit, the invention has great improvement in the aspects of saving power consumption, condensed water, running cost and the like, and has achieved commercial success.
Drawings
FIG. 1 is a graph illustrating the effect of uncondensed gas content on the heat release coefficient of a gas-vapor mixture.
Fig. 2 is a schematic view of the forced-ventilated type pre-coagulation vacuum-pumping system of the present invention.
Fig. 3 is a system layout diagram of the vacuum pump set in the present invention.
Fig. 4 is a schematic view of a conventional vacuum pumping system.
In the figure: the device comprises a condenser 1, a first gas-water outlet 1.1, a condensate water return port 1.2, a working liquid water return port 1.3, a pre-coagulation device 2, a gas-water inlet 2.1, a condensed water spraying inlet 2.2, a second gas-water outlet 2.3, a condensate outlet 2.4, a vacuum pump set 3, an air inlet pipe 3.1, a vacuum pump body 3.2, a heat exchanger 3.3, a gas-water separator 3.4, a motor 3.5, a drainage pump 4, a vacuum stop valve 5, a U-shaped bent pipe 6, condensed water 7, a gas-water mixture 8, a condensate water return 8.1, gas 8.2 and a working liquid water return 8.3.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, but they are not to be construed as limiting the invention, and are presented by way of example only, and the advantages of the invention will become more apparent and can be easily understood by description.
The uncondensed gas forms a gas film on the surface of the pipe to prevent steam from condensing, so that the heat release coefficient of steam on the steam side is firstly sharply and greatly reduced along with the increase of the gas content ratio and then is slowly reduced.
Referring to FIG. 1: the influence of the air content on the heat release coefficient of the gas-steam mixture can be seen, and the heat release coefficient alpha of the gas-steam mixture accounts for epsilon along with the airaThe increase of (a) is first sharply decreased and then slowly decreased. Therefore, it is a major challenge in direct or indirect air cooling units to pump out these non-condensable gases and maintain condenser vacuum.
The coal-fired power plant multi-purpose vacuum pump extracts noncondensable gas. The non-condensing gases may be primarily air that leaks into the condenser, where a large amount of saturated steam is also mixed. Saturated steam occupies a large amount of pumping space, so that the output of a plurality of engineering vacuum pumps is insufficient, the back pressure of a unit is increased, and the generating efficiency of the steam turbine is finally influenced.
Based on the method, a vacuum pump pre-coagulation device is additionally arranged behind a condenser in part of projects, so that part of saturated steam can be condensed in advance, and the amount of dry air extracted by a vacuum-pumping system is increased. However, the addition of the pre-condensing device has the following problems: firstly, the preposed coagulation tank is in a vacuum state, and the coagulated liquid is difficult to discharge. Secondly, a large amount of condensed water can not be recovered, and the situation of water shortage in northwest areas is further increased. And thirdly, the preposed condensing device is directly connected with the external atmosphere to cause the risk of air leakage of the condenser, so that the vacuum of the condenser is more difficult to maintain.
Referring to FIGS. 2-3: a forced-ventilated type preposed coagulation vacuum-pumping system comprises a condenser 1, a preposed coagulation device 2, a vacuum pump group 3, a drainage pump 4, a vacuum stop valve 5, a U-shaped bent pipe 6 and condensed water 7;
a first gas-water outlet 1.1 arranged at the top of the condenser 1 is connected with a gas-water inlet 2.1 arranged at one side of the pre-coagulation device 2 through a pipeline, and a second gas-water outlet 2.3 arranged at the top of the pre-coagulation device 2 is connected with one end of a gas inlet pipe 3.1 arranged in the vacuum pump unit 3 through a pipeline;
the other end of the air inlet pipe 3.1 is connected with a vacuum pump body 3.2, and one side of the vacuum pump body 3.2 is connected with an air-water separator 3.4 through a pipeline;
the working fluid overflow port 3.4.2 arranged at the bottom of the gas-water separator 3.4 is connected with the working fluid return port 1.3 arranged at the bottom of the condenser 1 through a pipeline; the condensed liquid outlet 2.4 arranged at the bottom of the pre-coagulation device 2 is connected with the inlet of the drainage pump 4 through a pipeline;
and an outlet of the drainage pump 4 is connected with a condensate return port 1.2 arranged on the condenser 1 through a pipeline.
A vacuum stop valve 5 and a U-shaped bent pipe 6 are arranged on a pipeline between the mixed condensate outlet 2.4 and the mixed condensate return port 1.2 on one side close to the condenser 1; a vacuum stop valve 5 and a U-shaped bent pipe 6 are also arranged on a pipeline between the working liquid overflow port 3.4.2 and the working liquid return port 1.3. The arrangement of the vacuum stop valve 5 and the U-shaped bent pipe 6 can completely prevent the gas leakage of the condensate return port 1.2 and the working liquid return port 1.3 of the condenser.
And a vacuum stop valve 5 is arranged at the outlet of the pipeline connected with each first gas-water outlet 1.1. The vacuum stop valve 5 can avoid gas leakage of the first gas-water outlet 1.1.
The condenser 1 comprises a gas-water outlet 1.1 arranged at the top, a mixed condensate water return port 1.2 arranged at the bottom and a working liquid water return port 1.3;
the lower part of one side of the pre-coagulation device 2 is provided with a gas-water inlet 2.1, the upper part of the other side is provided with a condensed water spraying inlet 2.2, and the condensed water spraying inlet 2.2 is communicated with an external condensed water structure 7; the top of the pre-coagulation device 2 is provided with a second gas-water outlet 2.3, and the bottom is provided with a coagulation liquid outlet 2.4;
the vacuum pump group 3 is provided with an air inlet pipe 3.1, a vacuum pump body 3.2, a plate heat exchanger 3.3, a gas-water separator 3.4 and a motor 3.5; the output end of the motor 3.5 is connected with the vacuum pump body 3.2;
the top of the gas-water separator 3.4 is provided with an exhaust port 3.4.1, the exhaust port 3.4.1 is communicated with the atmosphere, and the bottom of the gas-water separator 3.4 is provided with a working fluid overflow port 3.4.2.
Condenser 1, leading coagulation ware 2 and vacuum pump package 3 for system water sources such as better recovery working solution and coolant liquid to promote operating efficiency, save running cost.
The condenser 1 is arranged at a deep pit of the main plant, and the preposed mixing condenser 2, the vacuum pump group 3 and the drainage pump 4 are all arranged on a 0-meter layer of the main plant. The condenser 1, the preposed condenser 2, the vacuum pump group 3 and the drainage pump 4 can be installed in multiple sections, so that the whole equipment is convenient to transport, hoist, overhaul and maintain.
The utility model discloses still include a vacuum pumping method: a forced-ventilated type preposed coagulation vacuumizing method comprises the following steps;
firstly, opening all vacuum stop valves 5 and keeping pipelines smooth in the first step;
secondly, starting a motor of the vacuum pump set 3.5; starting to establish and maintain the vacuum state of the condenser 1, simultaneously spraying condensed water from the condensed water structure 7 into the pre-condenser 2 from the spraying inlet 2.2 and starting to spray, and simultaneously starting the drainage pump 4;
thirdly, the gas-water mixture 8 discharged from the condenser 1 enters a pre-arranged condenser 2 from the gas-water inlet 2.1 to start coagulation heat exchange with the condensed water structure 7, the gas-water mixture 8 after heat exchange is discharged to the vacuum pump group 3 from the gas-water outlet 2.3, and the partially heat-exchanged and condensed condensate return water 8.1 flows back to the condenser 1 from the condensate outlet 2.4 through the drainage pump 4;
the gas-water mixture 8 enters the vacuum pump body 3.2 from the gas inlet pipe 3.1, is pumped and then is discharged into the gas-water separator 3.4, the separated gas 8.2 is discharged to the atmosphere from the gas outlet 3.4.1, and the working fluid backwater 8.3 flows back to the condenser 1 from the working fluid overflow port 3.4.2 by means of the vacuum suction force in the condenser 1;
referring to FIG. 2: after the gas-water mixture 8 and the condensed water 7 exchange heat in the pre-coagulation device 2, the temperature is reduced, the water content is reduced, and the air pumping efficiency of a subsequent vacuum pump is improved.
Referring to FIG. 2: the liquid after heat exchange in the pre-coagulation device 2 flows back to the condenser 1 in a forced drainage mode through the drainage pump 4, so that resource recycling is realized.
Referring to FIG. 2: and the working liquid return water 8.3 is also injected back to the condenser 1 to further save the working water.
Referring to FIG. 2: the U-shaped bent pipe 6 is arranged at the end close to the condenser and has the water sealing function of preventing air from leaking into the condenser 1, and the related pipelines of the condensate return water 8.1 and the working fluid return water 8.3 which flow back to the condenser 1 are provided with the U-shaped bent pipe 6.
Referring to FIG. 4: the conventional vacuum pumping system mostly adopts a way that a pipeline between a condenser outlet and a vacuum pump is directly connected. The water mixture 8 discharged from the condenser 1 is discharged into the vacuum pump group 3 without any treatment, the temperature is high, the moisture content is large, the vacuum pump operates in overload all the year round, the temperature of working fluid is high, and the vacuum of the system cannot be guaranteed. Meanwhile, after the gas-water mixture 8 is subjected to gas-liquid separation by the gas-water separator 3.4, the redundant working solution backwater 8.3 is directly discharged to a sewage pool from an overflow port, so that a large amount of water resource waste is caused.
The following takes a set of typical indirect air cooling unit actual operation parameters as an example, and the calculation adopts the utility model discloses an influence to unit condenser air extraction, condensate water quantity behind the leading vacuum pumping system that thoughtlessly congeals by force formula. The specific parameters of the unit are shown in table 1:
TABLE 1 some parameters of the indirect air cooling unit
The dry air quantity is obtained by selecting an empirical value according to the condenser condensation quantity of the condenser by referring to HEI standard, and m is taken2=61.24Kg/m3And the air exhaust supercooling degree delta t is taken at 4.16 ℃ according to the HEI standard.
Calculating the partial pressure of steam and dry air in the steam and non-condensable gas mixture and the total volume of the steam-gas mixture under different working conditions according to the following steps:
(1) assuming that the total pressure of the steam-gas mixture is P0(kPa) and a steam partial pressure P1(kPa) and a dry air partial pressure P2(kPa), and P1That is, the steam saturation temperature corresponding to the operating pressure of the condenser minus the saturation pressure corresponding to the supercooling degree, and has P according to the Dalton partial pressure law0=P1+P2
(2) Assuming condenser operating pressure P0Lower corresponding saturated steam temperature of T0(DEG C), the actual operating temperature T of the condenserr=T0-△t(℃)
(3)P1Is TrCorresponding to the saturated vapor pressure, and P0I.e. the operating pressure of the condenser, so that the partial pressure P of the dry air can be determined2. According to the formulas 1 and 2, the volume of the mixture of steam and dry air can be obtained.
P2×v2=Rg×Tr (1)
m2×v2=V (2)
(4) Assuming a steam mass of m1Saturated steam corresponds to P1Specific volume of steam at V1The steam quality m can be obtained by looking up the formula 3 according to the saturated steam table1
m1×v1=m2×v2 (3)
According to the calculation method, the content of dry air and steam in the air exhaust and the volume of the air exhaust under the design working condition, the THA working condition and the summer working condition are calculated, and the calculation result is shown in table 2.
TABLE 2 calculation results
Taking the indirect air cooling unit as an example, for a conventional condensation vacuum system, the pumping volume of the vacuum pump is 3681m3The volume of the air to be drained is 61.24kg/h, and the iterative calculation can obtain: when P is present0When 10.3kPa, Δ t is 3.03088 ℃. When P is present0When 26.9kPa, Δ t is 1.36135 ℃.
When the flow rate Dw of the condensed water is 10000kg/h and the cooling water temperature Tw is 20 ℃, P is considered0When the pressure is 7.3KPa, the air extraction mass flow q is0212.12kg/h, with steam mass flow q in the bleed1150.88kg/h, and after heat exchange with condensed water, the temperature of the extracted air is calculated according to Newton's cooling theorem analysis1Decrease to t at 35.62 ℃2When the saturated steam pressure is 5.153kPa under the condition of 33.41 ℃, the steam is condensed into water after mixing and condensation, and the mass flow q is the mass flow q of the water2123.44kg/h, the mass flow q of cooling water after cooling by the front-end steam cooler310123.44 kg/h. And 5, the annual running cost of the part of cooling water is about 49.2 ten thousand yuan when the part of cooling water is operated for 5400 hours per year. If the sewage pump is additionally arranged, the power is 1.5kW and is selected according to the lift of 20m, the operation power consumption is increased by 8100kJ, and the cost including the sewage pump is about 15 ten thousand yuan. Return flow q of working fluid422626kg/h, the annual operating cost is about 109.9 ten thousand yuan. So when P is0When the pressure is 7.3KPa, the water operation cost of a condenser vacuumizing system is about 174.1 ten thousand yuan, and the power consumption is increased by 8100kJ after a sewage pump is additionally arranged. In the same way, the P is calculated according to the same method0When the pressure is 10.3kPa, the water use running cost of a condenser vacuumizing system is about 245.6 ten thousand yuan, and the power consumption is increased by 11421kJ after a sewage pump is additionally arranged; when P is present0When the pressure is 26.9kPa, the water operation cost of a condenser vacuum pumping system is about 641.5 ten thousand yuan, and the power consumption is increased by 42086kJ after a sewage pump is additionally arranged.
And adopted the utility model discloses behind the leading evacuation system that thoughtlessly congeals of forced-ventilated formula, the condensate water in leading cooler 2 mixes the back forced-ventilated to condenser 1 in and forms recovery cyclic utilization, and working solution return water 8.3 forms cyclic utilization in flowing back to condenser 1, and the cyclic utilization of these two parts cooling water yield has saved a large amount of extra water, has better dealt with the situation that northwest area water is nervous. Therefore, the utility model discloses compare conventional unit and save expense and consumption as shown in table 3.
TABLE 3 the utility model discloses compare conventional unit evacuation system working costs and consumption
The calculation result shows, the utility model discloses a leading evacuation system that thoughtlessly congeals of STREAMING all has great improvement in the aspect of saving consumption, running cost etc. than the relevant system of conventional indirect air cooling unit.
The above-mentioned parts not described in detail are prior art.

Claims (5)

1. The utility model provides a leading vacuum pumping system that thoughtlessly congeals of forced-ventilated formula which characterized in that: the device comprises a condenser (1), a pre-condenser (2), a vacuum pump set (3), a drainage pump (4), a vacuum stop valve (5), a U-shaped bent pipe (6) and a condensed water structure (7);
a first gas-water outlet (1.1) arranged at the top of the condenser (1) is connected with a gas-water inlet (2.1) arranged at one side of the pre-coagulation device (2) through a pipeline, and a second gas-water outlet (2.3) arranged at the top of the pre-coagulation device (2) is connected with one end of a gas inlet pipe (3.1) arranged in the vacuum pump set (3) through a pipeline;
the other end of the air inlet pipe (3.1) is connected with a vacuum pump body (3.2), and one side of the vacuum pump body (3.2) is connected with a gas-water separator (3.4) through a pipeline; the other end of the gas-water separator (3.4) is connected with the plate heat exchanger (3.3) through a pipeline, and the return water in the plate heat exchanger (3.3) is communicated with one side of the vacuum pump body (3.2) through a pipeline;
the working fluid overflow port (3.4.2) arranged at the bottom of the gas-water separator (3.4) is connected with the working fluid return port (1.3) arranged at the bottom of the condenser (1) through a pipeline; a condensed liquid outlet (2.4) arranged at the bottom of the pre-coagulation device (2) is connected with an inlet of the drainage pump (4) through a pipeline;
and an outlet of the drainage pump (4) is connected with a condensate return port (1.2) arranged on the condenser (1) through a pipeline.
2. A forced-ventilated type pre-coagulation vacuum-pumping system according to claim 1, wherein: a vacuum stop valve (5) and a U-shaped bent pipe (6) are arranged on a pipeline between the mixed condensate outlet (2.4) and the mixed condensate return port (1.2) on one side close to the condenser (1); a vacuum stop valve (5) and a U-shaped bent pipe (6) are arranged on a pipeline between the working liquid overflow port (3.4.2) and the water return port (1.3).
3. A forced-ventilated type pre-coagulation vacuum-pumping system according to claim 1, wherein: and a vacuum stop valve (5) is arranged at the outlet of the pipeline connected with each first gas-water outlet (1.1).
4. A forced-ventilated type pre-coagulation vacuum-pumping system according to claim 1 or 2, wherein: the condenser (1) comprises a plurality of first gas-water outlets (1.1) arranged at the top, a mixed condensate water return port (1.2) arranged at the bottom and a working liquid water return port (1.3);
a gas-water inlet (2.1) is formed in the lower part of one side of the pre-coagulation device (2), a condensed water spraying inlet (2.2) is formed in the upper part of the other side of the pre-coagulation device, and the condensed water spraying inlet (2.2) is communicated with an external condensed water structure (7); a second gas-water outlet (2.3) is arranged at the top of the pre-coagulation device (2), and a coagulation liquid outlet (2.4) is arranged at the bottom of the pre-coagulation device;
the vacuum pump set (3) is provided with an air inlet pipe (3.1), a vacuum pump body (3.2), a plate type heat exchanger (3.3), a gas-water separator (3.4) and a motor (3.5); the output end of the motor (3.5) is connected with the vacuum pump body (3.2);
the top of the gas-water separator (3.4) is provided with an exhaust port (3.4.1), the exhaust port (3.4.1) is communicated with the atmosphere, and the bottom of the gas-water separator (3.4) is provided with a working fluid overflow port (3.4.2).
5. A forced-ventilated type pre-coagulation vacuum-pumping system according to claim 1, wherein: the condenser (1) is arranged at a deep pit of a main plant, and the preposed coagulation device (2), the vacuum pump set (3) and the drainage pump (4) are all arranged on a 0-meter layer of the main plant.
CN202021712796.0U 2020-08-17 2020-08-17 Leading vacuum pumping system that thoughtlessly congeals of forced-ventilated formula Active CN213335626U (en)

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Application Number Priority Date Filing Date Title
CN202021712796.0U CN213335626U (en) 2020-08-17 2020-08-17 Leading vacuum pumping system that thoughtlessly congeals of forced-ventilated formula

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