CN212068269U - Heat supply system for sulfur dioxide desorption by cavitation of desulfurization rich liquid - Google Patents

Heat supply system for sulfur dioxide desorption by cavitation of desulfurization rich liquid Download PDF

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CN212068269U
CN212068269U CN202020272450.7U CN202020272450U CN212068269U CN 212068269 U CN212068269 U CN 212068269U CN 202020272450 U CN202020272450 U CN 202020272450U CN 212068269 U CN212068269 U CN 212068269U
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steam
cavitation
desorption
heat
desulfurization
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温高
温日辉
武福才
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Abstract

The utility model discloses a heating system for rich liquid cavitation desorption sulfur dioxide of desulfurization for receive industrial production steam extraction and for cavitation desorption SO2Heat is supplied, a steam jet pump and a bypass valve are arranged in front of a steam inlet, industrial production exhaust steam is sent into a steam heating chamber after the steam temperature is raised by the steam jet pump or through the bypass valve, and heat is transferred to desorbed liquid through a heating surface to generate cavitation desorption SO2The exhaust condensed water is sent back to the heat source regenerative system by a condensed water pump, and the non-condensed gas is evacuated by an air pump; a heat supply method for desorbing sulfur dioxide by cavitation of the desulfurization rich solutionThe waste heat of free exhaust steam is used for solving the problem of cavitation desorption SO2The large amount of heat required, significantly reduces SO2And (4) desorption cost.

Description

Heat supply system for sulfur dioxide desorption by cavitation of desulfurization rich liquid
Technical Field
The utility model belongs to the field of energy and power engineering and environmental engineering, concretely relates to heat supply system of desulfurization pregnant solution cavitation desorption sulfur dioxide.
Background
Currently, sulfur co-produced with coal is combusted to produce SO2Causes air pollution, is one of factors for forming acid rain and haze weather, and is a country poor in available sulfur resources. Therefore, the SO in the coal-fired flue gas is efficiently removed and recycled2The advanced method of (2) has been the subject of research and exploration.
The basic aluminium sulfate desorption desulfurization method is theoretically one of SO removal and desorption2High efficiency, desorption of SO from the desulfurized rich solution2The post-regenerated basic aluminum sulfate is recycled, and the desorption product-high-purity SO2Can be used as a product or for manufacturing sulfuric acid and sulfur for sale, and has double values of sulfur dioxide pollution treatment and coal sulfur resource reclamation.
The prior art discloses the removal of SO from alkaline aluminium sulphate solutions2The desulfurization rich solution desorbs SO2There are two main methods available: one is to steam the desulfurized rich solution by steam to steam the SO at 100 DEG C2The experiments of Shenyang chemical research institute in 1954 show that 1 ton of SO is desorbed when the desorption rate is close to 100%26.7 tons of low-pressure steam is consumed; secondly, the basic aluminum sulfate desulfurization pregnant solution cavitation desorption SO disclosed in the patents (ZL201821778513.5 and CN201811276655.6)2The method, the applicant's experiment shows that when the desorption rate is close to 94%, 1 ton of SO is desorbed by cavitation under the condition of 55 DEG C2About 6.7 tons of steam were generated, and it was found that 1 ton of SO was desorbed2Consumes at least 6.7 tons of heat (about 15.856X 10) required for water vaporization6Kilojoule, which is converted into electricity about 4404 degrees), the cost generated by desorption energy consumption is too high, so that the alkaline aluminum sulfate desorption desulfurization method cannot be popularized and applied.
In view of this, the present invention is especially provided.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model aims at providing a heating system of desulfurization pregnant solution cavitation desorption sulfur dioxide solves the too high problem of energy consumption expense that alkaline aluminum sulfate desorption desulfurization method produced.
In order to realize the above-mentioned purpose, the utility model provides a heating system of rich liquid cavitation desorption sulfur dioxide of desulfurization, including cavitation desorption device, cavitation desorption device is separated for upper chamber and lower chamber by the heating surface, the upper chamber is cavitation desorption chamber, the lower chamber is the vapor heating chamber, the vapor heating chamber is equipped with steam inlet, heating system utilizes the industry steam extraction to conduct the heat source of cavitation desorption chamber, steam inlet department is equipped with the steam jet pump, the industry steam extraction process the steam jet pump gets into the vapor heating chamber.
Furthermore, a bypass valve is further arranged at the steam inlet, the steam jet pump is connected with the bypass valve in parallel, and industrial exhaust steam enters the steam inlet through the steam jet pump or the bypass valve.
Further, the steam heating chamber is provided with a gas outlet and a condensed water outlet, the gas outlet is arranged at the upper part of the steam heating chamber, and the condensed water outlet is arranged at the lower part of the steam heating chamber.
Further, a suction pump is arranged on a pipeline of the gas outlet.
Furthermore, a condensed water pump is arranged on a pipeline of the condensed water outlet.
Further, a cooling system is connected to a cavitation desorption chamber of the heat supply system, and the cavitation desorption device is used for desorbing SO2And introducing the mixed gas with the water vapor into the cooling system.
The utility model provides a rich liquid cavitation desorption sulfur dioxide's of desulfurization heating system has following beneficial effect:
1. the industrial process exhaust contains a large amount of latent heat of vaporization and is discharged to the natural environment as waste heat. The utility model uses the waste heat to desorb SO for cavitation2Provides heat, not only solves the problem of SO desorption by cavitation2The required huge vaporization heat and the latent heat of the dead steam are obtained onceReuse, treat waste with waste, reduce SO2The cost of desorption;
2. heating industrial exhaust steam from 50 ℃ to 60 ℃ by using high-pressure working steam of a steam jet pump, wherein the heating heat consumed by each kilogram of exhaust steam is not more than 19 kilojoules; meanwhile, the water temperature of the condensed water is increased by 10 ℃, the condensed water can be sent back to a heat source regenerative system for recycling because the condensed water is not polluted, compared with the method for recycling the condensed water at 50 ℃, the heat of about 42 kilojoules can be recycled, the 19 kilojoule heat consumed by increasing the industrial exhaust steam at 10 ℃ by using a steam jet pump can be completely offset, and as a result, the free heat of 2358.4 kilojoules/kilogram, which releases latent heat in the condensation of water vapor at 60 ℃, is obtained, obviously, the SO is reduced2The desorption cost is extremely obvious;
3. the higher the steam temperature of the exhaust steam heated by the steam jet pump is, the larger the difference between the set cavitation desorption temperature of the exhaust steam and the set cavitation desorption temperature of the desorbed liquid is, the better the heat exchange effect is, and the smaller the investment of the cavitation desorption device is;
4. the SO of the utility model2The desorption cost is obviously reduced, and the bottleneck of popularization and application of the alkaline aluminum sulfate desorption desulfurization method is broken through, so that the method can be widely applied.
Drawings
Fig. 1 is a schematic structural diagram of a heat supply system for cavitation desorption of sulfur dioxide in a desulfurization rich solution according to the embodiment.
In the drawings: 1. the device comprises a cavitation desorption device 2, a direct air cooling system 3, a throttle valve 4, a water pump device 5, a desulfurization system 6, a cavitation desorption chamber 7, a steam heating chamber 8, a heating surface 9, an induced bubble filler 10, an exhaust port 11, a desorption liquid inlet 12, a desorption liquid outlet 13, a condensed water inlet 14, a steam inlet 15, a condensed water outlet 16, a gas outlet 17, a steam jet pump 18, a bypass valve 19, a condensed water pump 20 and an air pump.
Detailed Description
In order to make the technical field better understand the solution of the present invention, the present invention will be further described in detail with reference to the following embodiments.
This patent discloses a desorption SO2The heat supply system is used for carrying out the cavitation desorption of SO in the alkaline aluminum sulfate desulfurization rich liquid2Systems for supplying heat, using industrial productionDesorption of SO from latent heat released by condensation of waste steam or dead steam2The waste is treated by waste, and the desorption SO is obviously reduced2The cost of (a).
As shown in figure 1, the heat supply system for the cavitation desorption of sulfur dioxide by the desulfurization rich solution utilizes the exhaust steam of a steam turbine as the supply of the cavitation desorption SO2The heat source of the heat comprises a cavitation desorption device 1, a direct air cooling system 2, a steam jet pump 17, a water pump device 4, a throttle valve 3, a condensate pump 19, an air pump 20 and connecting pipelines among the devices. The cavitation desorption device 1 is divided into an upper chamber and a lower chamber by a heating surface 8, the upper chamber is a cavitation desorption chamber 6, the cavitation desorption chamber 6 is provided with an exhaust port 10, a desorption liquid inlet 11, a desorption liquid outlet 12, a condensed water inlet 13 and an induced bubble filler 9, and the upper surface of the heating surface 8 of the cavitation desorption device 1 is provided with the induced bubble filler 9 for strengthening desulfurization rich liquid cavitation; the lower chamber is a steam heating chamber 7, the steam heating chamber 7 is provided with a steam inlet 14, the lower part of the steam heating chamber 7 is provided with a condensed water outlet 15, the upper part of the steam heating chamber 7 is provided with a gas outlet 16, a steam jet pump 17 is arranged on a pipeline of the steam inlet 14, a bypass valve 18 is arranged on the pipeline of the steam inlet 14, and steam turbine exhaust enters the steam inlet 14 through the steam jet pump 17 or the bypass valve 18.
SO flowing out of an exhaust port 10 of the cavitation desorption chamber 62And the mixed gas with the water vapor enters a cooling system, the cooling system selects a direct air cooling system 2, the direct air cooling system 2 comprises a steam distribution system, a radiator, a condensed water system and a vacuum pumping system, and the position of the direct air cooling system 2 is higher than that of the cavitation desorption device 1.
Example 1
Setting the basic aluminum sulfate desulfurization pregnant solution cavitation desorption temperature of the cavitation desorption chamber to be 55 ℃, reducing the pressure in the cavitation desorption chamber by using a cooling system, and maintaining the saturated steam pressure corresponding to the cavitation desorption temperature; the exhaust steam of a steam turbine operating at the back pressure of 12.34kPa is used as the supply for supplying cavitation desorption SO2The exhaust steam of the heat source has the corresponding steam temperature of about 50 ℃; setting the temperature difference between the steam in the steam heating chamber and the alkaline aluminum sulfate desulfurization rich liquid in the cavitation desorption chamber to be 5 ℃.
The heat supply method for desorbing sulfur dioxide by cavitation of the desulfurization rich solution comprises the following steps:
(1) starting the steam extraction pump 20 to empty the non-condensable gas in the water vapor heating chamber 7;
(2) starting a vacuumizing system of the direct air cooling system 2 to reduce the pressure in the cavitation desorption chamber 6 to the saturated steam pressure corresponding to 55 ℃ of the desulfurization rich liquid;
(3) closing the bypass valve 18; the throttle valve 3 regulates and controls the flow of the desulfurization rich liquid entering the cavitation desorption chamber 6; the method comprises the steps of utilizing a certain stage of steam extraction of a power plant to drive a steam jet pump 17 to heat exhaust steam of a turbine at 50 ℃ to 60 ℃, sending the exhaust steam into a steam heating chamber 7 through a steam inlet 14, absorbing heat transferred by a heating surface 8 by desorbed liquid on the upper surface of the heating surface 8 to generate cavitation under the action of temperature difference between 60 ℃ steam in the steam heating chamber 7 and 55 ℃ desorbed liquid in a cavitation desorption chamber 6, condensing the steam on the lower surface of the heating surface 8 by cavitation absorbed heat, and realizing interaction by the interaction, wherein the steam is continuously condensed to release latent heat to be transferred to the desorbed liquid, and is continuously cavitated to ensure that SO in alkaline aluminum sulfate desulfurization rich liquid2Desorbing, wherein the gas in the cavitation desorption chamber 6 is SO2Mixing the gas with water vapor;
(4) SO to be fed by the direct air cooling system 22Cooling and liquefying the steam in the mixed gas with the steam to form condensed water to obtain high-purity SO with the purity higher than 99 percent2A gas;
(5) because the space position of the direct air cooling system 2 is higher than that of the cavitation desorption device 1, condensed water can flow back to the cavitation desorption chamber 6 from the direct air cooling system 2 under the action of gravity;
(6) the vacuum-pumping system is used for pumping high-purity SO2Gas is delivered from the direct air cooling system 2 to the SO2The method is applied to the process flow for utilization;
(7) the water pump device 4 is used for desorbing SO2The regenerated alkaline aluminum sulfate solution after the gas is returned to the desulfurization system 5 for recycling;
(8) non-condensable gas in the water vapor heating chamber 7 is evacuated through a gas outlet 16 by an air pump 20, saturated vapor pressure corresponding to the cavitation desorption temperature in the cavitation desorption chamber 6 is maintained by the direct air cooling system 2, and water continuously condensed in the water vapor heating chamber 7 passes through condensed waterAn outlet 15 is sent to a heat source regenerative system through a condensate pump 19, steam in the steam heating chamber is heated to 60 ℃ from exhaust steam at 50 ℃ through a steam jet pump 17 and then is continuously supplied through a steam inlet 14, and condensate water and non-condensate gas are continuously discharged, SO that the exhaust steam of a steam turbine is utilized to perform cavitation desorption on SO for the desulfurization rich solution2The system supplying heat is continuously and stably operated.
The high-pressure working steam of the steam jet pump 17 is used for heating the exhaust steam of the steam turbine by 10 ℃, and the heating heat consumed by each kilogram of the exhaust steam is not more than 19 kilojoules; meanwhile, the water temperature of the condensed water is increased by 10 ℃, the condensed water can be sent back to a heat source regenerative system for recycling because the condensed water is not polluted, compared with the method for recycling the condensed water at 50 ℃, the heat of about 42 kilojoules can be recycled, the 19 kilojoule heat consumed by increasing the discharged steam of the steam turbine at 10 ℃ by using a steam jet pump can be completely offset, and as a result, the free heat of 2358.4 kilojoules/kilogram, which is the latent heat released by the condensation of the water vapor at 60 ℃, is obtained, obviously, the SO is reduced2The cost of desorption is extremely significant. In addition, the higher the steam temperature of the exhaust steam heated by the steam jet pump is, the larger the difference between the set cavitation desorption temperature of the exhaust steam and the set cavitation desorption temperature of the desorbed liquid is, the better the heat exchange effect is, and the smaller the investment of the cavitation desorption device is.
Example 2
Setting the basic aluminum sulfate desulfurization pregnant solution cavitation desorption temperature of the cavitation desorption chamber to be 55 ℃, reducing the pressure in the cavitation desorption chamber by using a cooling system, and maintaining the saturated steam pressure corresponding to the cavitation desorption temperature; the exhaust steam of a steam turbine operating at the back pressure of 25.1kPa is used as the supply of cavitation desorption SO2The exhaust steam of the heat source corresponds to the steam temperature of about 65 ℃. Setting the temperature difference between the steam in the steam heating chamber and the alkaline aluminum sulfate desulfurization rich liquid in the cavitation desorption chamber to be 10 ℃.
The heat supply method for desorbing sulfur dioxide by cavitation of the desulfurization rich solution comprises the following steps:
(1) starting the steam extraction pump 20 to empty the non-condensable gas in the water vapor heating chamber 7;
(2) starting a vacuumizing system of the direct air cooling system 2 to reduce the pressure in the cavitation desorption chamber 6 to the saturated steam pressure corresponding to 55 ℃ of the desulfurization rich liquid;
(3) opening the bypass valve 18; throttle valve3 regulating and controlling the flow of the desulfurization rich liquid entering the cavitation desorption chamber 6, directly sending the exhaust steam of a steam turbine at 65 ℃ into a steam heating chamber through a bypass valve 18 and a steam inlet 14, absorbing the heat transferred from the heating surface 8 by the desorbed liquid on the upper surface of the heating surface 8 to generate cavitation under the action of the temperature difference between the water vapor at 65 ℃ in the steam heating chamber 7 and the desorbed liquid at 55 ℃ in the cavitation desorption chamber 6, and condensing the water vapor on the lower surface of the heating surface 8 by the absorbed heat through cavitation, SO that the interaction is realized, the steam is continuously condensed to release latent heat to be transferred to the desorbed liquid, and the continuous cavitation is realized to ensure that SO in the basic aluminum sulfate desulfurization rich liquid2Desorbing, wherein the gas in the cavitation desorption chamber 6 is SO2Mixing the gas with water vapor;
(4) SO to be fed by the direct air cooling system 22Cooling and liquefying the steam in the mixed gas with the steam to form condensed water to obtain high-purity SO with the purity higher than 99 percent2A gas;
(5) because the space position of the direct air cooling system 2 is higher than that of the cavitation desorption device 1, condensed water can flow back to the cavitation desorption chamber 6 from the direct air cooling system 2 under the action of gravity;
(6) the vacuum-pumping system is used for pumping high-purity SO2Gas is delivered from the direct air cooling system 2 to the SO2The method is applied to the process flow for utilization;
(7) the water pump device 4 is used for desorbing SO2The regenerated alkaline aluminum sulfate solution after the gas is returned to the desulfurization system 5 for recycling;
(8) noncondensable gas in the steam heating chamber 7 is exhausted through a gas outlet 16 by an air pump 20, saturated steam pressure corresponding to the cavitation desorption temperature in the cavitation desorption chamber 6 is maintained by the direct air cooling system 2, water which is continuously condensed in the steam heating chamber 7 is sent back to the heat source heat return system through a condensed water outlet 15 by a condensed water pump 19, steam turbine exhaust steam at 65 ℃ in the steam heating chamber is continuously supplied through a bypass valve 18 and a steam inlet 14, and the condensed water and the noncondensable gas are continuously discharged, SO that the steam turbine exhaust steam is used for carrying out the cavitation desorption on SO for the desulfurization rich liquid2The system supplying heat is continuously and stably operated.
The steam turbine which is not lifted by the steam jet pump is used for exhausting steam, the heat does not need to be charged, and each kilogram of exhausted steam at the temperature of 65 ℃ can utilize about 2345 kilojoules for free.
The inventive concept is explained in detail herein using specific examples, and the above description of the embodiments is only used to help understand the core idea of the present invention. It should be understood that any obvious modifications, equivalents and other improvements made by those skilled in the art without departing from the spirit of the present invention are intended to be included within the scope of the present invention.

Claims (6)

1. The utility model provides a heating system of rich liquid cavitation desorption sulfur dioxide of desulfurization, includes cavitation desorption device, and cavitation desorption device is for last room and lower room by the heating surface separation, it is the cavitation desorption room to go up the room, the room is the vapor heating chamber down, the vapor heating chamber is equipped with the steam inlet, a serial communication port, heating system utilizes the industry to discharge steam as the heat source of cavitation desorption room, steam inlet department is equipped with the steam jet pump, the industry is discharged steam and is passed through the steam jet pump gets into the vapor heating chamber.
2. The system for supplying heat for sulfur dioxide by cavitation of desulfurization pregnant solution according to claim 1, wherein a bypass valve is further disposed at the steam inlet, the steam jet pump and the bypass valve are connected in parallel, and the industrial exhaust steam enters the steam inlet through the steam jet pump or the bypass valve.
3. The system of claim 1, wherein the steam heating chamber is provided with a gas outlet and a condensed water outlet, the gas outlet is disposed at an upper portion of the steam heating chamber, and the condensed water outlet is disposed at a lower portion of the steam heating chamber.
4. The system for supplying heat to conduct desulfurization, pregnant solution, cavitation and desorption sulfur dioxide according to claim 3, wherein a suction pump is arranged on the pipeline of the gas outlet.
5. The system for supplying heat to desorb sulfur dioxide through cavitation of rich desulfurization solution according to claim 3, wherein a condensate pump is disposed on the pipeline of the condensate outlet.
6. The heat supply system for sulfur dioxide desorption by cavitation of desulfurization pregnant solution as claimed in claim 1, wherein the cavitation desorption chamber of the heat supply system is connected with a cooling system, and the cavitation desorption device is used for desorbing SO2And introducing the mixed gas with the water vapor into the cooling system.
CN202020272450.7U 2020-03-06 2020-03-06 Heat supply system for sulfur dioxide desorption by cavitation of desulfurization rich liquid Active CN212068269U (en)

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