CN211625876U - Waste heat recovery vacuum drying system - Google Patents
Waste heat recovery vacuum drying system Download PDFInfo
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- CN211625876U CN211625876U CN202020224699.0U CN202020224699U CN211625876U CN 211625876 U CN211625876 U CN 211625876U CN 202020224699 U CN202020224699 U CN 202020224699U CN 211625876 U CN211625876 U CN 211625876U
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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]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The utility model discloses a waste heat recovery vacuum drying system, including: the vacuum drying unit is provided with a vacuum drying bin, a heat exchanger and a water ring pump, wherein the heat exchanger and the water ring pump are positioned in the vacuum drying bin; the heat supply assembly is provided with a high-temperature water tank and an air source heat pump, a first water outlet of the high-temperature water tank is communicated with a medium inlet of the heat exchanger, a first water inlet of the high-temperature water tank is communicated with a medium outlet of the heat exchanger, a second water inlet of the high-temperature water tank is communicated with a heat exchange outlet of a first condenser of the air source heat pump, and a second water outlet of the high-temperature water tank is communicated with a heat exchange inlet of the; the waste heat recovery unit is provided with a water source heat pump, a water inlet of the water ring pump is communicated with a heat exchange outlet of a second evaporator of the water source heat pump, a pressure release valve is arranged between the water inlet of the water ring pump and the heat exchange outlet of the second evaporator, a water outlet of the water ring pump is communicated with a heat exchange inlet of the second evaporator, a third water inlet of the high-temperature water tank is communicated with a heat exchange outlet of the second condenser, and a third water outlet of the high-temperature water tank is communicated with a heat exchange.
Description
Technical Field
The utility model relates to a vacuum drying technical field, more specifically say, relate to a waste heat recovery vacuum drying system.
Background
At present, a vacuum drying technology appears in the technical field of material drying, and the vacuum drying comprises freeze drying or heat supply drying. The heat supply drying is to put the material into a drying cavity, then heat is supplied to the drying cavity and vacuum is pumped, so that the moisture in the material is evaporated at low temperature and is pumped away along with the gas, and the material is dried. However, in the process of heating and drying, the power devices such as the pump set and the like extract more heat from the air in the drying cavity, and waste heat is generated. This waste heat is exhausted into the air, creating a waste of resources.
Based on the above situation, there is a need for further improvement of the existing vacuum drying system, which can recycle the waste heat in the vacuum drying process to reduce the industrial energy consumption.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a waste heat recovery vacuum drying system, it is provided with waste heat among the waste heat recovery unit recovery pump package and gives the heat supply subassembly with waste heat and carry out the heat supply to the stoving storehouse, makes used heat can utilize, and the auxiliary heat source of heat supply subassembly is the air source heat pump, and effective the energy that reduces consumes.
The utility model provides a waste heat recovery vacuum drying system, which comprises a vacuum drying unit, a heat supply assembly and a waste heat recovery unit; the vacuum drying unit comprises a vacuum drying bin, a heat exchanger and a pump set, wherein the heat exchanger is positioned in the vacuum drying bin, the pump set is used for pumping vacuum, the pump set comprises a water ring pump, and an air inlet of the water ring pump is communicated with the vacuum drying bin through a pipeline; the heat supply assembly comprises a high-temperature water tank and an air source heat pump for supplying heat to the high-temperature water tank, a first water outlet of the high-temperature water tank is communicated with a medium inlet of the heat exchanger, a first water inlet of the high-temperature water tank is communicated with a medium outlet of the heat exchanger, the air source heat pump comprises a first evaporator, a first compressor, a first condenser and a throttle valve group, a second water inlet of the high-temperature water tank is communicated with a heat exchange outlet of the first condenser, and a second water outlet of the high-temperature water tank is communicated with a heat exchange inlet of the first condenser; the waste heat recovery unit comprises a water source heat pump, the water source heat pump comprises a second evaporator, a second compressor, a second condenser and a throttle valve, a water inlet of the water ring pump is communicated with a heat exchange outlet of the second evaporator, a pressure release valve is arranged on a pipeline between the water inlet and the heat exchange outlet of the second evaporator, a water outlet of the water ring pump is communicated with a heat exchange inlet of the second evaporator, a third water inlet of the high-temperature water tank is communicated with a heat exchange outlet of the second condenser, a third water outlet of the high-temperature water tank is communicated with a heat exchange inlet of the second condenser.
Preferably, the air source heat pump further comprises a gas-liquid separator, an inlet of the gas-liquid separator is communicated with the working medium outlet of the first evaporator, and an outlet of the gas-liquid separator is communicated with the inlet of the first compressor.
Preferably, the air source heat pump further comprises a solar heat collector connected in parallel with the first evaporator, a working medium inlet of the solar heat collector is communicated with a refrigerant outlet of the first condenser, and a working medium outlet of the solar heat collector is communicated with an inlet of the first compressor.
Preferably, the throttle valve set comprises a first electronic expansion valve located between the first condenser and the first evaporator, and a second electronic expansion valve located between the first condenser and the solar collector.
Preferably, the high-temperature water tank with be provided with first booster pump between the first condenser, the second condenser with be provided with the third booster pump between the high-temperature water tank, the high-temperature water tank with be provided with the fourth booster pump between the heat exchanger.
Preferably, still including temperature control device, temperature control device include the controller and with controller communication connection's first temperature sensor, first temperature sensor is used for detecting the temperature in the vacuum drying storehouse, the controller with the third booster pump electricity is connected, so that the controller is according to first temperature sensor's signal control the switching of third booster pump.
Preferably, the temperature control device further comprises a second temperature sensor in communication connection with the controller, the second temperature sensor is used for detecting the water temperature in the high-temperature water tank, and the controller is electrically connected with the first booster pump and the second booster pump so that the controller controls the opening and closing of the first booster pump and the second booster pump according to a signal of the second temperature sensor.
Preferably, the air source heat pump further includes a third temperature sensor, the third temperature sensor is configured to detect an outer surface temperature of the solar thermal collector and is in communication connection with the controller, electric valves are disposed between the solar thermal collector and the first condenser and between the first evaporator and the first condenser, and the controller is electrically connected to the two electric valves to control opening and closing of the two electric valves according to a signal of the third temperature sensor.
Preferably, the vacuum drying device further comprises a pressure sensor for detecting the air pressure in the vacuum drying bin, the pressure sensor is in communication connection with the controller, and the vacuum drying bin is provided with a pressure release valve electrically connected with the controller, so that the controller controls the opening and closing of the pressure release valve according to a signal of the pressure sensor.
Preferably, the refrigerant outlet of the first condenser is communicated with the enthalpy increasing port of the first compressor, and a third electronic expansion valve is arranged between the refrigerant outlet of the first condenser and the enthalpy increasing port of the first compressor.
The utility model provides an among the technical scheme, waste heat recovery vacuum drying system, including the vacuum drying unit that is used for providing vacuum environment, be used for the heat supply subassembly of vacuum drying heat supply and be used for carrying out waste heat recovery's waste heat recovery unit. The heat supply assembly comprises a high-temperature water tank and an air source heat pump for supplying heat to the high-temperature water tank, and the high-temperature water tank is communicated with a heat exchanger located in the vacuum drying bin and supplies heat to the vacuum drying bin. Therefore, the heat supply assembly is used for supplying heat and drying heat to the vacuum drying bin, so that the materials are dried at a low temperature in vacuum, and compared with the vacuum freeze drying, the energy-saving vacuum drying device saves a freezing link and is more energy-saving; and the heat supply assembly supplies heat by using the air source heat pump, so that the heat source of the heat supply assembly is absorbed by the air source heat pump from the air, only partial electric energy is consumed, and the energy consumption is low. Simultaneously, owing to be the heat supply is dried, the pump package contains the heat from the air of vacuum drying storehouse extraction, consequently, the technical scheme of the utility model in, it is the water ring pump to set up in the pump package that the extraction is vacuum, the heat mixes with the water that gets into the water ring pump through the air inlet of water ring pump, then the mixed outflow water ring pump. The waste heat recovery unit is provided with a water source heat pump, water entering and exiting the water ring pump is used as a heat source of the water source heat pump, heat in the water is absorbed and transferred to the high-temperature water tank through the water source heat pump, waste heat is recycled, and energy consumed by vacuum drying is further reduced.
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 these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a waste heat recovery vacuum drying system in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an air source heat pump in an embodiment of the present invention.
In fig. 1-2:
1. a vacuum drying bin; 2. a heat exchanger; 3. a roots pump; 4. a water ring pump; 5. a hot water tank; 6. an air source heat pump; 61. a first evaporator; 62. a first compressor; 63. a first condenser; 64. an economizer; 65. A solar heat collector; 66. a third temperature sensor; 67. a capillary tube; 7. a water source heat pump; 71. a second evaporator; 72. a second compressor; 73. a second condenser; 8. a first booster pump; 9. a second booster pump; 10. a third booster pump; 11. and (4) a negative pressure tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The present invention provides a waste heat recovery vacuum drying system, which is provided with a waste heat recovery unit for recovering waste heat in a pump set and transferring the waste heat to a heat supply unit for supplying heat to a drying bin, so that the waste heat can be utilized, and an auxiliary heat source of the heat supply unit is an air source heat pump, thereby effectively reducing energy consumption.
Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.
Referring to fig. 1, the waste heat recovery vacuum system provided in this embodiment includes a vacuum drying unit for providing a vacuum environment, a heat supply assembly for supplying heat to the vacuum drying unit, and a waste heat recovery unit for recovering waste heat. The vacuum drying unit comprises a vacuum drying bin 1, a heat exchanger 2 positioned in the vacuum drying bin 1 and a pump set for vacuumizing the vacuum drying bin 1. Specifically, the vacuum drying chamber 1 may be a box structure, or may be formed by a chamber of a vacuum tank. The vacuum drying bin 1 is provided with a material inlet for material to enter and exit and a sealing door for opening and closing the material inlet. The pump package includes water ring pump 4, and the air inlet of water ring pump 4 with through pipeline and vacuum drying storehouse 1 intercommunication makes the air in the vacuum drying storehouse 1 get into water ring pump 4, mix with the water that gets into water ring pump 4, then flow out from the delivery port of water ring pump 4 jointly. The pump set can make the vacuum drying bin 1 in vacuum.
The heat supply assembly comprises a hot water tank 5 and an air source heat pump 6 used for supplying heat to the hot water tank 5, a first water outlet of the hot water tank 5 is communicated with a medium inlet of the heat exchanger 2, a first water inlet of the hot water tank 5 is communicated with a medium outlet of the heat exchanger 2, so that water containing heat in the hot water tank 5 enters the vacuum drying bin 1, and the heat is dissipated in the heat exchanger 2 to supply heat to the vacuum drying bin 1. The heat exchanger 2 can be a pipeline type heat exchanger 2 and is paved on the vacuum drying bin 1 to accelerate the heat exchange speed. And in the vacuum environment, the heat is transferred in the form of heat radiation, so that the heat loss is small, the heat transfer is fast, and the heating efficiency is high. The material is dried at low temperature in a vacuum environment, compared with vacuum freeze drying in the prior art, the method avoids a freezing link, saves energy consumption, can avoid taste loss without freezing the material, and can ensure that the material has better appearance and reduce the degree of taste loss by low-temperature heat drying.
The air source heat pump 6 comprises a first evaporator 61, a first compressor 62, a first condenser 63 and a throttle valve group, wherein a second water inlet of the hot water tank 5 is communicated with a heat exchange outlet of the first condenser 63, and a second water outlet of the hot water tank is communicated with a heat exchange inlet of the first condenser 63. The air source heat pump 6 absorbs heat from air through the first evaporator 61, works through the compressor, changes the state of a refrigerant, then the refrigerant enters the first condenser 63 to transfer the heat to water of the hot water tank 5 and heat the hot water tank 5, and compared with the mode of using other electric heaters to supply heat, the air source heat pump only consumes electric energy required by the work of a small part of the compressor, and the energy consumption is effectively reduced.
The waste heat recovery unit comprises a water source heat pump 7, the water source heat pump 7 comprises a second evaporator 71, a second compressor 72, a second condenser 73 and a throttle valve, a water inlet of the water ring pump 4 is communicated with a heat exchange outlet of the second evaporator 71, a water outlet of the water ring pump 4 is communicated with a heat exchange inlet of the second evaporator 71, a third water inlet of the hot water tank 5 is communicated with a heat exchange outlet of the second condenser 73, and a third water outlet is communicated with a heat exchange inlet of the second condenser 73. The water of the water ring pump 4 flows through the second evaporator 71 of the water source heat pump 7, and the refrigerant can absorb the heat in the water flowing out of the water ring pump 4, then is compressed by the second compressor 72, enters the second condenser 73 for heat dissipation, and transfers the heat to the hot water tank 5. Therefore, heat in the air pumped out in the vacuum pumping process can be mixed into water through the water ring pump 4 and then absorbed by the water source heat pump 7, the water source heat pump 7 is used for heating water in the hot water tank 5 by the absorbed heat, the hot water tank 5 can have double heat sources, the heating is stable, and energy consumed by vacuum drying can be further reduced. And the recovered waste heat and the air source heat pump 6 transfer heat to the hot water tank 5, store heat in a centralized manner, and then supply the heat to the vacuum drying bin 1 in a centralized manner, so that the supply temperature is stable, large temperature and heat fluctuation can not be generated, and the reduction of the drying efficiency is avoided.
Since the mixture of gas and water is introduced into the second evaporator 71 from the water ring pump 4, the amount of water is more than that of gas, and therefore the heat storage of the second evaporator 71 is not affected. However, in order to prevent the pressure in the pipeline from being too high, a pressure relief valve is arranged on the pipeline between the water outlet of the water ring pump 4 and the heat exchange inlet of the second evaporator 71, so that the gas in the pipeline can be discharged and the pressure can be released.
It should be noted that the air source heat pump 6 and the water source heat pump 7 are heat pump devices in the prior art, and both comprise an evaporator, a compressor, a condenser and a throttle valve: the refrigerant exchanges heat and absorbs heat with external media in the evaporator, the compressor is positioned between the evaporator and the condenser and used for compressing the refrigerant after absorbing heat to enable the refrigerant to be in a high-pressure gas state, then the refrigerant enters the condenser to supply heat, and then flows into the evaporator from the condenser to perform next circulation, so that the purpose of heat conversion of the heat pump is achieved. The throttle valve is arranged between the refrigerant outlet of the condenser and the refrigerant inlet of the evaporator and used for balancing the flow and the pressure of the refrigerant in the pipeline. The evaporator of the air source heat pump 6 absorbs heat from the outside air by the refrigerant, and the evaporator of the water source heat pump 7 absorbs heat from the outside circulating water by the refrigerant. The condenser is a refrigerant to supply heat to external circulating water. The compressor is used for compressing the refrigerant from the evaporimeter, makes it be the high pressure attitude, and the compressor has three mouth: an inlet, an outlet, and an enthalpy-increasing port.
As shown in fig. 1, the throttle valve of the waterhead heat pump 7 is provided as an electronic expansion valve, connected between the refrigerant outlet of the second condenser 73 and the refrigerant inlet of the second evaporator 71, and is also provided with a filter.
As shown in fig. 1, the first evaporator 61 of the air-source heat pump 6 is an air-cooled evaporator, and is provided with an axial flow fan, and the axial flow fan and the fins of the first evaporator 61 are arranged oppositely, so that the air flow around the first evaporator 61 is accelerated, and the heat exchange efficiency is improved. The air-source heat pump 6 is further provided with a gas-liquid separator connected between the refrigerant outlet of the first evaporator 61 and the inlet of the first compressor 62 to prevent a part of liquid refrigerant included in the refrigerant from entering the compressor.
Since heat is absorbed from the air, the first evaporator 61 is easily affected by the ambient temperature, and particularly in a low-temperature environment, the temperature around the first evaporator 61 decreases, and the heating efficiency decreases. To solve the problem, as shown in fig. 2, the air source heat pump 6 of the present embodiment is further provided with another heat absorbing device, namely a solar heat collector 65, the solar heat collector 65 has a solar heat collecting plate and a working medium cavity for performing heat exchange with the heat collecting plate, and the working medium cavity is provided with a working medium inlet and a working medium outlet. The solar heat collector 65 and the first evaporator 61 are arranged in parallel, a working medium inlet of the solar heat collector 65 is communicated with a refrigerant inlet of the first condenser 63 through a pipeline, a working medium outlet is communicated with an inlet of the gas-liquid isolator through a pipeline, and the refrigerant enters the solar heat collector 65 to absorb heat. The air source heat pump 6 is provided with two heat absorption devices, so that the solar energy and the heat in the air can be utilized, and the heat supply is stable; can select to use solar collector 65 or first evaporimeter 61 to absorb heat according to the weather condition, can reduce the number of times of use of first evaporimeter 61 under low temperature environment, solve the heating efficiency reduction problem of first evaporimeter 61 that is caused by the low temperature influence, improve whole heating efficiency, guarantee heat supply stability.
The solar heat collector 65 and the first evaporator 61 are arranged in parallel, and a stop valve is arranged on a refrigerant pipeline between the solar heat collector and the first evaporator and the gas-liquid separator for switching use operation. A throttle valve is provided in the line between both and the first condenser 63. The throttle valve may be an electronic expansion valve. A first electronic expansion valve is disposed between the first condenser 63 and the first evaporator 61, and a second electronic expansion valve is disposed between the first condenser 63 and the solar collector 65. The refrigerant outlet of the first condenser 63 is also connected to the enthalpy increasing port of the first compressor 62, and a third electronic expansion valve is disposed therebetween. In a preferred embodiment of the present invention, the refrigerant outlet of the first condenser 63 is provided with an economizer 64, and the economizer 64 is respectively communicated with the enthalpy increasing port of the first compressor 62, the refrigerant inlet of the first evaporator 61, and the working medium inlet of the solar heat collector 65. The economizer 64 may divide the refrigerant in a high pressure state flowing out of the first condenser 63 into two paths, wherein the first path directly enters the first compressor 62, and the second path is divided into two paths connected in parallel, and the two paths respectively enter the solar heat collector 65 and the first evaporator 61 to absorb heat and then enter the first compressor 62. And the first and second paths are heat exchanged in the economizer 64 to reduce power consumption of the first compressor 62. The economizer 64 is added to accelerate the refrigerant circulation efficiency and enhance the heating efficiency.
As shown in fig. 2, the working medium inlet end of the solar heat collector 65 is connected to the refrigerant inlet end of the second evaporator 71 by a bypass via a capillary tube 67, one end of the capillary tube 67 is connected to the working medium inlet of the solar heat collector 65, and the connection point is located downstream of the first electronic expansion valve, and the other end is connected to the refrigerant inlet of the second evaporator 71, and the connection point is located downstream of the second electronic expansion valve. So set up, can play the bypass connection effect, when the refrigerant inflation in solar collector 65 caused pressure too high, can shunt partial refrigerant and get into another route, quick release pressure prevents harm such as pipeline fracture, also strengthens the safety protection to solar collector 65.
A first booster pump 8 is arranged between the air source heat pump 6 and the hot water tank 5, a second booster pump 9 is arranged between the water source heat pump 7 and the hot water tank 5, and a third booster pump 10 is arranged between the hot water tank 5 and the heat exchanger 2. As shown in fig. 1, the first booster pump 8 is located between the second water outlet of the hot water tank 5 and the heat exchange inlet of the first condenser 63, the second booster pump 9 is located between the third water outlet of the hot water tank 5 and the heat exchange inlet of the second condenser 73, and the third booster pump 10 is located between the first water outlet of the hot water tank 5 and the medium inlet of the heat exchanger 2, so as to ensure the speed and flow rate of water flow circulation at each place and ensure the heat exchange efficiency.
The vacuum drying unit can be provided with a vacuum tank, the pump unit is provided with a roots pump 3 and a water ring pump 4, the pumping hole of the roots pump 3 is communicated with the vacuum tank, and the air inlet of the water ring pump 4 is communicated with the air outlet of the roots pump 3. The tank cavity of the vacuum tank is the vacuum drying bin 1. Simultaneously, the vacuum drying unit still includes negative pressure jar 11, and the air inlet of negative pressure jar 11 communicates with vacuum drying storehouse 1, and the gas outlet communicates with the air inlet of lobe pump 3, and negative pressure jar 11 is located the gas route between vacuum jar and lobe pump 3, can play steady voltage's effect to the pressure in the vacuum drying storehouse 1 and in the pipeline.
The material is heated and dried, and the heating and drying can be carried out at constant temperature in order to reduce the damage to the taste and the appearance. Therefore, in this embodiment, a temperature control device is further provided, the temperature control device includes a controller and a first temperature sensor in communication connection with the controller, the first temperature sensor is connected to the vacuum tank and used for detecting the temperature in the vacuum drying bin 1, the controller is electrically connected to the third booster pump 10, and the controller determines whether the temperature in the vacuum drying bin 1 reaches a preset temperature value according to a signal of the first temperature sensor, so as to control the opening and closing of the third booster pump 10, and keep the temperature in the vacuum drying bin 1 constant.
Furthermore, the constant temperature control can be carried out on the hot water tank 5, so that the heat supply temperature is kept constant, the heat supply is stable, and the temperature fluctuation is avoided. Specifically, a second temperature sensor in communication connection with a controller is provided on the hot water tank 5, and the controller is electrically connected with the first booster pump 8 and the second booster pump 9. The controller judges whether the water temperature in the hot water tank 5 reaches a preset value or not according to the signal of the second temperature sensor, keeps the heat supply of the water source heat pump 7 and the air source heat pump 6 to the hot water tank 5 when the water temperature is lower than the preset value, and cuts off the heat supply to the hot water tank 5 by closing the first booster pump 8 and the second booster pump 9 when the water temperature reaches or exceeds the preset value.
Further, pressure monitoring control can be carried out on the vacuum drying bin 1, and a pressure sensor in communication connection with the controller and a pressure release valve electrically connected with the controller are arranged on the vacuum tank. The detection end of the pressure sensor is positioned in the vacuum drying bin 1, and when the pressure in the bin exceeds a preset value, the controller can automatically open the pressure release valve to supplement air, so that the pressure in the bin can be accurately controlled.
The temperature control device can also control the automatic switching of the two heat absorbing devices of the air source heat pump 6. As shown in fig. 2, the solar collector 65 is provided with a third temperature sensor 66 communicatively connected to the controller, and a sensing end of the third temperature sensor 66 is in contact with an outer panel surface of the solar collector panel to sense a surface temperature of the collector panel. The solar heat collector 65 and the stop valves between the first evaporator 61 and the gas-liquid separator are all set as electric valves, and the controller is electrically connected with the two electric valves, the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve. When the detected temperature of the third temperature sensor 66 does not reach the preset value, the controller opens the path of the first evaporator 61 and uses the first evaporator 61 to absorb heat from the air; when the temperature detected by the third temperature sensor 66 reaches a preset value, the controller opens the solar heat collector 65 to supply heat by using solar energy. So, both guarantee that the heat supply is stable, also to heat supply switching control accurate. The controller can be a PLC with the model of Siemens smart-700 in the prior art or a singlechip.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments. The multiple schemes provided by the invention comprise basic schemes, are independent from each other and are not restricted with each other, but can be combined with each other under the condition of no conflict, so that multiple effects are realized together.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A waste heat recovery vacuum drying system is characterized by comprising a vacuum drying unit, a heat supply assembly and a waste heat recovery unit;
the vacuum drying unit comprises a vacuum drying bin (1), a heat exchanger (2) positioned in the vacuum drying bin (1) and a pump set for vacuumizing the vacuum drying bin (1), wherein the pump set comprises a water ring pump (4), and an air inlet of the water ring pump (4) is communicated with the vacuum drying bin (1) through a pipeline;
the heat supply assembly comprises a hot water tank (5) and an air source heat pump (6) used for supplying heat to the hot water tank (5), a first water outlet of the hot water tank (5) is communicated with a medium inlet of the heat exchanger (2), a first water inlet of the hot water tank is communicated with a medium outlet of the heat exchanger (2), the air source heat pump (6) comprises a first evaporator (61), a first compressor (62), a first condenser (63) and a throttle valve group, a second water inlet of the hot water tank (5) is communicated with a heat exchange outlet of the first condenser (63), and a second water outlet of the hot water tank (5) is communicated with a heat exchange inlet of the first condenser (63);
the waste heat recovery unit comprises a water source heat pump (7), the water source heat pump (7) comprises a second evaporator (71), a second compressor (72), a second condenser (73) and a throttle valve, a water inlet of a water ring pump (4) is communicated with a heat exchange outlet of the second evaporator (71), a water outlet of the water ring pump (4) is communicated with a heat exchange inlet of the second evaporator (71) and a pressure release valve is arranged between the water inlet and the communication and on a pipeline between the water inlet and the communication, and a third water inlet of a hot water tank (5) is communicated with the heat exchange outlet of the second condenser (73), a third water outlet and the heat exchange inlet of the second condenser (73).
2. The waste heat recovery vacuum drying system as claimed in claim 1, wherein the air source heat pump (6) further comprises a gas-liquid separator, an inlet of the gas-liquid separator is communicated with a working medium outlet of the first evaporator (61), and an outlet of the gas-liquid separator is communicated with an inlet of the first compressor (62).
3. The waste heat recovery vacuum drying system as claimed in claim 1, wherein the air source heat pump (6) further comprises a solar heat collector (65) connected in parallel with the first evaporator (61), a working medium inlet of the solar heat collector (65) is communicated with a refrigerant outlet of the first condenser (63), and a working medium outlet is communicated with an inlet of the first compressor (62).
4. The heat recovery vacuum drying system of claim 3, wherein the set of throttle valves comprises a first electronic expansion valve between the first condenser (63) and the first evaporator (61) and a second electronic expansion valve between the first condenser (63) and the solar collector (65).
5. The waste heat recovery vacuum drying system of claim 3, characterized in that a first booster pump (8) is arranged between the hot water tank (5) and the first condenser (63), a second booster pump (9) is arranged between the second condenser (73) and the hot water tank (5), and a third booster pump (10) is arranged between the hot water tank (5) and the heat exchanger (2).
6. The waste heat recovery vacuum drying system as claimed in claim 5, further comprising a temperature control device, wherein the temperature control device comprises a controller and a first temperature sensor in communication connection with the controller, the first temperature sensor is used for detecting the temperature in the vacuum drying chamber (1), and the controller is electrically connected with the third booster pump (10), so that the controller controls the third booster pump (10) to open and close according to the signal of the first temperature sensor.
7. The heat recovery vacuum drying system of claim 6, wherein the temperature control device further comprises a second temperature sensor in communication connection with the controller, the second temperature sensor is used for detecting the temperature of water in the hot water tank (5), and the controller is electrically connected with the first booster pump (8) and the second booster pump (9) so that the controller controls the opening and closing of the first booster pump (8) and the second booster pump (9) according to a signal of the second temperature sensor.
8. The heat recovery vacuum drying system according to claim 7, wherein the air source heat pump (6) further comprises a third temperature sensor (66), the third temperature sensor (66) is used for detecting the temperature of the outer surface of the solar heat collector (65) and is in communication connection with the controller, electric valves are arranged between the solar heat collector (65) and the first condenser (63) and between the first evaporator (61) and the first condenser (63), and the controller is electrically connected with the two electric valves to control the opening and closing of the two electric valves according to the signal of the third temperature sensor (66).
9. The waste heat recovery vacuum drying system according to claim 6, further comprising a pressure sensor for detecting air pressure in the vacuum drying bin (1), wherein the pressure sensor is in communication connection with the controller, and the vacuum drying bin (1) is provided with a pressure release valve electrically connected with the controller, so that the controller controls the opening and closing of the pressure release valve according to a signal of the pressure sensor.
10. The heat recovery vacuum drying system as claimed in claim 1, wherein the refrigerant outlet of the first condenser (63) is connected to the enthalpy increasing port of the first compressor (62), and a third electronic expansion valve is disposed therebetween.
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| CN112484470A (en) * | 2020-11-27 | 2021-03-12 | 攀枝花钢城集团瑞通制冷设备有限公司 | Powdery material drying system and using method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112484470A (en) * | 2020-11-27 | 2021-03-12 | 攀枝花钢城集团瑞通制冷设备有限公司 | Powdery material drying system and using method thereof |
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