CN212299536U - Lithium bromide absorption type refrigerating unit for preparing low-temperature cold water - Google Patents
Lithium bromide absorption type refrigerating unit for preparing low-temperature cold water Download PDFInfo
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- CN212299536U CN212299536U CN202020675146.7U CN202020675146U CN212299536U CN 212299536 U CN212299536 U CN 212299536U CN 202020675146 U CN202020675146 U CN 202020675146U CN 212299536 U CN212299536 U CN 212299536U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
Abstract
The utility model belongs to the refrigeration plant field, concretely relates to lithium bromide absorption refrigeration unit for preparing low temperature cold water. The unit comprises a condenser, an absorber, an evaporator, a high-temperature regenerator, a low-temperature heat exchanger, a high-temperature heat exchanger, a connecting pipeline and a solution pump, wherein a monitoring control system is additionally arranged, a solution control pipeline and a refrigerant water control pipeline are arranged, the monitoring control system comprises a concentration measuring device, a solution control valve, a refrigerant water control valve and a control device, the concentration measuring device, the solution control valve and the refrigerant water control valve are respectively and electrically connected with the control device, the concentration measuring device is connected with the evaporator, the solution control valve is arranged on the solution control pipeline, and the refrigerant water control valve is arranged on the refrigerant water control pipeline. The utility model discloses a low concentration lithium bromide solution is the cryogen, through concentration measurement device, solution control valve, cryogen water control valve and the accurate control refrigerant concentration of controlling means, can guarantee that the cryogen does not freeze, can prepare the low temperature refrigerated water again.
Description
Technical Field
The utility model belongs to the refrigeration plant field, concretely relates to lithium bromide absorption refrigeration unit for preparing low temperature cold water.
Background
At present, the absorption refrigerating unit is most widely applied to a lithium bromide absorption refrigerating unit, the lithium bromide solution is used as an absorbent, water is used as a refrigerant, and cold water with the temperature of more than 5 ℃ is generally prepared under the driving of heat energy to meet the requirements of air conditioning or process refrigeration. The unit can utilize waste heat to refrigerate, is a main energy comprehensive utilization device in the fields of industry, energy and the like, is widely applied to industrial waste heat recovery refrigeration of industries such as steel, petrifaction and chemical industry, namely, waste heat recovery is realized, and refrigeration can meet process requirements, however, in many practical industrial places, on one hand, a lot of industrial waste heat exists, on the other hand, lower-temperature chilled water is needed, for example, the chemical industry needs a large amount of low-temperature chilled water at minus 5-0 ℃, in the past, an absorption type refrigerating unit adopts water as a refrigerant, in order to ensure that the refrigerant water is not frozen, the temperature of the refrigerant water cannot be too close to 0 ℃, so that low-temperature chilled water below 5 ℃ cannot be prepared, the current preparation method of the low-temperature chilled water at minus 5-0 ℃ is two-stage cooling, namely, the first stage prepares cold water at about 5 ℃ through lithium bromide absorption type waste heat recovery, and the second, therefore, the problems of incapability of fully utilizing industrial waste heat, complex system, large investment and the like are caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving present refrigerating unit and can not prepare below 5 ℃ low temperature cold water, mainly adopt the two-stage cooling method to prepare-5 ~ 0 ℃ low temperature refrigerated water, the system architecture is complicated, and the great technical problem of investment cost, a lithium bromide absorption refrigerating unit for preparing low temperature cold water is provided, this unit make full use of industry waste heat, the lithium bromide aqueous solution that adopts the low concentration is the cryogen, through monitoring control system and corresponding control pipeline accurate control lithium bromide solution concentration, can guarantee that the cryogen does not freeze, can prepare 0 ℃ about low temperature refrigerated water again, the system is simple, and the investment is little.
The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is: the system comprises a condenser, an absorber, an evaporator, a high-temperature regenerator, a low-temperature heat exchanger, a high-temperature heat exchanger, a condensed water heat exchanger, a heat recoverer, corresponding connecting pipelines and a solution pump, wherein the absorber, the high-temperature regenerator, the low-temperature regenerator and the corresponding connecting pipelines form a solution circulation loop, a driving heat source is connected to the high-temperature regenerator and the heat recoverer through pipelines, cooling water is connected to the absorber and the condenser through pipelines, chilled water is connected to the evaporator through pipelines, a monitoring control system, a solution control pipeline and a refrigerant water control pipeline are additionally arranged, the monitoring control system comprises a concentration measuring device, a solution control valve, a refrigerant water control valve and a control device, the concentration measuring device, the solution control valve and the refrigerant water control valve are respectively and electrically connected with the control device, the concentration measuring device is connected with the evaporator and is used for measuring the concentration of refrigerant, the solution control valve is arranged on the solution control pipeline, the refrigerant water control valve is arranged on the refrigerant water control pipeline, and refrigerant in the evaporator evaporates and absorbs heat of chilled water in the chilled water pipeline to prepare low-temperature chilled water.
Further, the concentration measuring device adopts a direct measuring device or an indirect measuring device, the direct measuring device comprises a concentration meter, the concentration meter is connected with the evaporator, and the concentration meter is connected with the control device through an electric signal; the indirect measuring device comprises a temperature sensor, a pressure sensor, a densimeter and a conductivity meter, wherein the temperature sensor, the pressure sensor, the densimeter and the conductivity meter are respectively connected with the evaporator, and the temperature sensor, the pressure sensor, the densimeter and the conductivity meter are respectively connected with the control device through electric signals.
Further, the refrigerant is a lithium bromide aqueous solution or a calcium chloride aqueous solution.
Furthermore, the refrigerant in the evaporator is conveyed to a dripping device at the upper part of the evaporator through a pipeline and a refrigerant circulating pump, and the refrigerant dripped by the dripping device is evaporated to generate refrigerant steam to enter the absorber.
Further, the low-temperature heat exchanger and the condensate heat exchanger adopt a parallel structure.
Furthermore, refrigerant steam generated in the high-temperature regenerator is connected to the low-temperature regenerator through a pipeline, the refrigerant steam exchanges heat in the low-temperature regenerator to become refrigerant water, and the refrigerant water is connected to the condenser through the pipeline and the condensate heat exchanger.
Further, the driving heat source comprises steam, hot water, fuel combustion heat and flue gas.
Furthermore, the solution control pipeline is arranged between the absorber and the evaporator, a dilute solution pump and a solution control valve are arranged on the solution control pipeline, dilute solution in the absorber is conveyed into the evaporator through the solution control pipeline, the refrigerant water control pipeline is arranged between the condenser and the evaporator, a storage water tank, a storage water pump and a refrigerant water control valve are arranged on the refrigerant water pipeline, refrigerant water in the storage water tank is conveyed into the evaporator through the refrigerant water control pipeline, and refrigerant in the evaporator evaporates and absorbs heat of chilled water in the chilled water pipeline to prepare low-temperature chilled water.
The utility model has the advantages that:
(1) adopt the lithium bromide aqueous solution of low concentration to be the cryogen, the freezing temperature of lithium bromide aqueous solution is less than 0 ℃, the freezing temperature of the lithium bromide aqueous solution of different concentrations is different, and lithium bromide solution concentration can be set for according to actual refrigerated water temperature demand in the evaporimeter to through concentration measurement device, solution control valve, cryogen water control valve and its solution concentration of controlling means accurate control, can guarantee that the cryogen does not freeze, can prepare about 0 ℃ low temperature refrigerated water again, the utility model discloses not only be applicable to the absorption refrigeration unit who uses lithium bromide and water as the working medium, also be applicable to other absorption refrigeration units such as calcium chloride and water.
(2) The single-stage circulation process for preparing the low-temperature chilled water at about 0 ℃ is characterized in that an independent storage water tank is adopted, so that the independent storage of refrigerant water can be ensured, the concentration of a lithium bromide solution in an evaporator can be conveniently controlled, and a unit runs stably.
(3) The low-temperature chilled water at about 0 ℃ is prepared by utilizing the driving of heat energy such as steam, flue gas, hot water, fuel combustion and the like, the industrial waste heat is fully utilized, and the requirement of the process low-temperature chilled water can be met.
Drawings
Fig. 1 is a flow chart of a lithium bromide absorption refrigerating unit for preparing low-temperature cold water according to the present invention.
In the figure: 1. the system comprises a concentration measuring device, 2, a storage water tank, 3, a storage water pump, 4, a storage water control valve, 5, a refrigerant circulating pump, 6, an evaporator, 7, a dilute solution pump, 8, a solution control valve, 9, an absorber, 10, a low-temperature heat exchanger, 11, a concentrated solution pump, 12, a heat recoverer, 13, a drain valve, 14, a high-temperature regenerator, 15, a high-temperature heat exchanger, 16, a condensate heat exchanger, 17, a low-temperature regenerator, 18, a condenser, 19, a solution control pipeline, 20, a refrigerant water control pipeline, 21, a refrigerant water pipeline, A, a chilled water inlet, B, a chilled water outlet, C, a cooling water inlet, D, a cooling water outlet, E, a driving heat source inlet and F, a driving heat source outlet.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples, but the present invention is not limited to the specific examples.
Fig. 1 shows a flow chart of a lithium bromide absorption refrigeration unit for preparing low-temperature cold water according to the present invention, which mainly comprises the following components: the system comprises a condenser 18, an absorber 9, an evaporator 6, a high-temperature regenerator 14, a low-temperature regenerator 17, a low-temperature heat exchanger 10, a high-temperature heat exchanger 15, a condensate heat exchanger 16, a heat recoverer 12, a dilute solution pump 7, a concentrated solution pump 11, a refrigerant circulating pump 5, a chilled water inlet A, a chilled water outlet B, a cooling water inlet C, a cooling water outlet D, a driving heat source inlet E, a driving heat source outlet F and corresponding connecting pipelines. The evaporator 6 and the absorber 9 are arranged in the same cylinder, the condenser 18 and the low-temperature regenerator 17 are arranged in the same cylinder, and the high-temperature regenerator 14 is separately arranged in the same cylinder. The absorption refrigerating unit takes lithium bromide and water as working media, cooling water is connected to an absorber 9 and a condenser 18 through pipelines, chilled water is connected to an evaporator 6 through a chilled water pipeline 21, a driving heat source is connected to a high-temperature regenerator 14 and a heat recoverer 12 through pipelines, a drain valve 13 is arranged on a driving heat source pipeline, the drain valve 13 is positioned between the high-temperature regenerator 14 and the heat recoverer 12, the driving heat source comprises steam, hot water, fuel combustion heat and flue gas, refrigerant steam generated in the high-temperature regenerator 14 is connected to a low-temperature regenerator 17 through pipelines, the refrigerant steam exchanges heat in the low-temperature regenerator 17 to become refrigerant water, and the refrigerant water is connected to the condenser 18 through a pipeline and a condensate heat exchanger 16. The absorber 9, the condensate heat exchanger 16, the low-temperature heat exchanger 10, the high-temperature heat exchanger 15, the high-temperature regenerator 14, the low-temperature regenerator 17 and corresponding connecting pipelines form a solution circulation loop, the lithium bromide solution is divided into two paths after passing through the dilute solution pump 7, the two paths of lithium bromide solution are converged after passing through the low-temperature heat exchanger 10 and the condensate heat exchanger 16 respectively and are connected to the high-temperature regenerator 14 and the low-temperature regenerator 17 through the heat recoverer 12 and the high-temperature heat exchanger 15, the high-concentration lithium bromide solution in the low-temperature regenerator 17 is connected to a dripping device on the upper part of the absorber 9 through a pipeline and a concentrated solution pump 11, the concentrated solution absorbs refrigerant steam from the evaporator 6 to become dilute solution, and the next circulation process is carried out, wherein the low-temperature heat exchanger 10 and the condensate heat exchanger 16 are in a parallel connection structure.
The utility model discloses a monitoring control system is added to the cooling water set, solution control pipeline 19 and cryogen water control pipeline 20, monitoring control system includes concentration measurement device 1, solution control valve 8, store water control valve 4 and controlling means, concentration measurement device 1, solution control valve 8 and cryogen water control valve 4 are connected with controlling means electricity respectively, concentration measurement device 1 is connected with evaporimeter 6, be used for monitoring the concentration of lithium bromide solution in evaporimeter 6, solution control pipeline 19 sets up between absorber 9 and evaporimeter 6, be provided with weak solution pump 7 and solution control valve 8 on solution control pipeline 19, weak solution in absorber 9 is carried to the evaporimeter 6 in through solution control pipeline 19, cryogen water control pipeline 20 sets up between condenser 18 and evaporimeter 6, be provided with on cryogen water pipeline 20 and store the water tank 2, store water pump 3 and store water control valve 4, the refrigerant water in the storage water tank 2 is conveyed into the evaporator 6 through a refrigerant water control pipeline 20, the storage water tank 2 can be used for ensuring that the refrigerant water is independently stored, the concentration of the lithium bromide solution in the evaporator 6 can be conveniently controlled, the concentration measuring device 1 adopts a direct measuring device or an indirect measuring device, the direct measuring device comprises a concentration meter, the concentration meter is connected with the evaporator 6 and is connected with a control device through an electric signal, the concentration of the lithium bromide solution in the evaporator 6 is directly measured through the concentration meter, the result is sent to the control device, and the control device sends the electric signal to the solution control valve 8 and the refrigerant water control valve 4, so that the adjustment of the solution control valve 8 and the refrigerant water control valve 4 is controlled; indirect measuring device includes temperature sensor, pressure sensor, densimeter and conductivity meter, and temperature sensor, pressure sensor, densimeter and conductivity meter are connected with evaporimeter 6 respectively, and temperature sensor, pressure sensor, densimeter and conductivity meter are connected with the controller electricity through the signal of telecommunication respectively, and according to the physical properties of lithium bromide solution, the following three kinds of indirect measurement mode of lithium bromide solution concentration accessible derive: the temperature and density parameters are calculated, the temperature and pressure parameters are calculated or the temperature and conductivity parameters are calculated, an indirect measurement mode can be selected according to actual application conditions, the adjustment of the solution control valve 8 and the refrigerant water control valve 7 is further controlled, when the concentration of the lithium bromide solution in the evaporator 6 is too high, the lithium bromide solution in the evaporator 6 is conveyed to a dripping device on the upper part of the evaporator 6 through a pipeline and a refrigerant circulating pump 5, the lithium bromide solution dripped by the dripping device is evaporated to generate refrigerant steam which enters an absorber 9, and the refrigerant in the evaporator 6 is evaporated to absorb the heat of the chilled water in the chilled water pipeline 21 to prepare the chilled water with the temperature of about 0 ℃.
The operation process of the unit is as follows: a driving heat source (steam, hot water, fuel combustion heat, flue gas and the like) enters a high-temperature regenerator 14 to heat a lithium bromide dilute solution which comes from an absorber 9 and exchanges heat through a condensate heat exchanger 16, a low-temperature heat exchanger 10, a heat recoverer 12 and a high-temperature heat exchanger 15, the lithium bromide dilute solution is heated and boiled, refrigerant water is evaporated into primary refrigerant steam, and the dilute solution is concentrated into an intermediate solution; the intermediate solution enters a low-temperature regenerator 17 after being subjected to heat exchange by a high-temperature heat exchanger 15, and the intermediate solution is concentrated into a concentrated solution by primary refrigerant steam from a high-temperature regenerator 14 in the low-temperature regenerator 17 and simultaneously evaporated to generate secondary refrigerant steam; the concentrated solution from the low-temperature regenerator 17 enters the absorber 9 after heat exchange by the low-temperature heat exchanger 10, and absorbs the refrigerant steam from the evaporator 6 to become dilute solution. The primary refrigerant steam from the high-temperature regenerator 14 enters a low-temperature regenerator 17 for heat exchange to become refrigerant water, and then enters a condenser 18 for heat exchange through a condensate heat exchanger 16; the secondary refrigerant steam from the low-temperature regenerator 17 enters a condenser 18 to exchange heat with cooling water to be changed into refrigerant water, the primary refrigerant steam and the secondary refrigerant steam are converged in the condenser 18 after being changed into water and then enter a storage water tank 2 through a throttling and pressure reducing device, and the concentration of the lithium bromide solution in the evaporator 6 is accurately controlled through a storage water pump 3, a storage water control valve 4, a solution control valve 8 and a control device, so that the refrigerant is ensured not to be frozen, and low-temperature chilled water can be prepared. The lithium bromide solution concentration in the evaporator 6 was controlled as follows: when the concentration of the lithium bromide solution is lower than a set value, the lithium bromide solution is injected into the evaporator 6 through the solution control valve 8; when the concentration of the lithium bromide solution is higher than a set value, pumping refrigerant water into the evaporator 6 through the storage water pump 3 and the storage water control valve 4; when the concentration of the lithium bromide solution in the evaporator 6 is too high, the lithium bromide solution is discharged into the absorber 9 by the refrigerant circulation pump 5. The chilled water enters the heat transfer pipe of the evaporator 6, and the low-concentration lithium bromide solution evaporates and absorbs the heat of the chilled water in the heat transfer pipe outside the heat transfer pipe, so that the purpose of preparing the low-temperature chilled water at about 0 ℃ is achieved, the low-temperature chilled water is anti-freezing, and anti-freezing liquid with certain concentration is generally added, and the cooling water enters the absorber 9 and the condenser 27, so that the heat of the chilled water and a heat source is absorbed, the heat balance is ensured, and the operation of a unit is ensured.
In the embodiment, steam, hot water, fuel combustion heat, flue gas and the like are used as driving heat sources, so that the industrial waste heat can be fully utilized, and the requirement of low-temperature chilled water in the process can be met.
In the above embodiment, a low-concentration lithium bromide aqueous solution is used as a refrigerant, the freezing temperature of the lithium bromide aqueous solution is lower than 0 ℃, and the freezing temperatures corresponding to different concentrations of the lithium bromide aqueous solution are as follows:
| lithium bromide concentration% | 0 | 5 | 10 | 15 | 20 |
| Freezing temperature of | 0 | -2.5 | -6 | -10 | -16 |
Lithium bromide solution concentration can be set for according to actual refrigerated water temperature demand in the evaporimeter to through its solution concentration of concentration measurement device, solution control valve, cryogen water control valve and controlling means accurate control, can guarantee that the cryogen does not freeze, can prepare low temperature refrigerated water again, the utility model discloses not only be applicable to and use lithium bromide and water as the absorption refrigeration unit of working medium, also be applicable to other absorption refrigeration units such as calcium chloride and water.
The above description is further detailed in connection with the preferred embodiments of the present invention, and it is not intended that the specific embodiments of the present invention be limited to these descriptions. To the utility model belongs to the technical field of the ordinary technical personnel, do not deviate from the utility model discloses a under the prerequisite of the design, can also make simple deduction and replacement, all should regard as the utility model discloses a protection scope.
Claims (7)
1. The utility model provides a lithium bromide absorption refrigeration unit for preparing low temperature cold water, includes condenser, absorber, evaporimeter, high temperature regenerator, low temperature heat exchanger, high temperature heat exchanger, congeals water heat exchanger, heat recovery ware and corresponding connecting line and solution pump, absorber, high temperature regenerator, low temperature regenerator and corresponding connecting line constitute solution circulation circuit, and the drive heat source is inserted to high temperature regenerator and heat recovery ware through the pipeline, and the cooling water is inserted to absorber and condenser through the pipeline, and the chilled water is inserted to evaporimeter, its characterized in that through the pipeline: the system is additionally provided with a monitoring control system, a solution control pipeline and a refrigerant water control pipeline, wherein the monitoring control system comprises a concentration measuring device, a solution control valve, a refrigerant water control valve and a control device, the concentration measuring device, the solution control valve and the refrigerant water control valve are respectively and electrically connected with the control device, the concentration measuring device is connected with an evaporator and is used for measuring the concentration of refrigerant in the evaporator, the solution control valve is arranged on the solution control pipeline, the solution control pipeline is arranged between an absorber and the evaporator, a dilute solution pump is arranged on the solution control pipeline, dilute solution in the absorber is conveyed into the evaporator through the solution control pipeline, the refrigerant water control valve is arranged on the refrigerant water control pipeline, the refrigerant water control pipeline is arranged between a condenser and the evaporator, and a storage water tank and a storage water pump are arranged on the refrigerant water pipeline, the refrigerant water in the storage water tank is conveyed into the evaporator through the refrigerant water control pipeline, and the refrigerant in the evaporator evaporates and absorbs the heat of the chilled water in the chilled water pipeline to prepare low-temperature chilled water.
2. The lithium bromide absorption refrigerating unit for preparing cold water at low temperature as set forth in claim 1, wherein: the concentration measuring device adopts a direct measuring device or an indirect measuring device, the direct measuring device comprises a concentration meter, the concentration meter is connected with the evaporator, and the concentration meter is connected with the control device through an electric signal; the indirect measuring device comprises a temperature sensor, a pressure sensor, a densimeter and a conductivity meter, wherein the temperature sensor, the pressure sensor, the densimeter and the conductivity meter are respectively connected with the evaporator, and the temperature sensor, the pressure sensor, the densimeter and the conductivity meter are respectively connected with the control device through electric signals.
3. The lithium bromide absorption refrigerating unit for preparing cold water at low temperature as set forth in claim 1, wherein: the refrigerant is a lithium bromide aqueous solution or a calcium chloride aqueous solution.
4. The lithium bromide absorption refrigerating unit for preparing cold water at low temperature as set forth in claim 1, wherein: the refrigerant in the evaporator is conveyed to a dripping device at the upper part of the evaporator through a pipeline and a refrigerant circulating pump, and the refrigerant dripped by the dripping device is evaporated to generate refrigerant steam to enter an absorber.
5. The lithium bromide absorption refrigerating unit for preparing cold water at low temperature as set forth in claim 1, wherein: the low-temperature heat exchanger and the condensed water heat exchanger are in parallel connection.
6. The lithium bromide absorption refrigerating unit for preparing cold water at low temperature as set forth in claim 1, wherein: and the refrigerant steam generated in the high-temperature regenerator is connected to the low-temperature regenerator through a pipeline, the refrigerant steam exchanges heat in the low-temperature regenerator to form refrigerant water, and the refrigerant water is connected to the condenser through the pipeline and the condensate heat exchanger.
7. The lithium bromide absorption refrigerating unit for preparing cold water at low temperature as set forth in claim 1, wherein: the driving heat source comprises steam, hot water, fuel combustion heat and flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020675146.7U CN212299536U (en) | 2020-04-28 | 2020-04-28 | Lithium bromide absorption type refrigerating unit for preparing low-temperature cold water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020675146.7U CN212299536U (en) | 2020-04-28 | 2020-04-28 | Lithium bromide absorption type refrigerating unit for preparing low-temperature cold water |
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| CN212299536U true CN212299536U (en) | 2021-01-05 |
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| CN202020675146.7U Active CN212299536U (en) | 2020-04-28 | 2020-04-28 | Lithium bromide absorption type refrigerating unit for preparing low-temperature cold water |
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