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CN-122015338-A - Comprehensive utilization system and method for mixed recovery of waste heat by utilizing heat pump unit

CN122015338ACN 122015338 ACN122015338 ACN 122015338ACN-122015338-A

Abstract

The invention discloses a comprehensive utilization system and a comprehensive utilization method for mixed recovery of waste heat by a heat pump unit, and relates to the technical field of waste heat recovery of heat pump units. The low-grade heat energy heat pump unit comprises a first evaporator, a first compressor and a first condenser, wherein the first evaporator is communicated with the first compressor to convey endothermic evaporated refrigerant to the first compressor for compression, the first compressor is communicated with the first condenser to convey compressed high-temperature high-pressure gas to the first condenser so that the refrigerant radiates heat in the first condenser for condensation to supply heat, and the high-grade heat energy heat pump unit comprises a second evaporator, a second compressor and a second condenser, the second evaporator is communicated with the second compressor to convey endothermic evaporated refrigerant to the second compressor for compression, and the second compressor is communicated with the second condenser to convey compressed high-temperature high-pressure gas to the second condenser.

Inventors

  • WANG HAIFENG
  • Zhou Zanqing
  • XU HUI
  • ZHANG GANG
  • ZHANG JUNLONG

Assignees

  • 青岛安清源新能源科技有限公司

Dates

Publication Date
20260512
Application Date
20260206

Claims (10)

  1. 1. Utilize heat pump set to mix comprehensive utilization system who retrieves waste heat, its characterized in that includes: The low-grade heat energy heat pump unit comprises a first evaporator (1), a first compressor (2) and a first condenser (3), wherein the first evaporator (1) is communicated with the first compressor (2) to convey a refrigerant for absorbing heat and evaporating to the first compressor (2) for compression, and the first compressor (2) is communicated with the first condenser (3) to convey gas compressed into high temperature and high pressure to the first condenser (3) so as to enable the refrigerant to dissipate heat and condense in the first condenser (3) for heat supply; The high-grade heat energy heat pump unit comprises a second evaporator (4), a second compressor (5) and a second condenser (6), wherein the second evaporator (4) is communicated with the second compressor (5) to convey a refrigerant for absorbing heat and evaporating to the second compressor (5) for compression, and the second compressor (5) is communicated with the second condenser (6) to convey gas compressed into high temperature and high pressure to the second condenser (6) so as to enable the refrigerant to dissipate heat and condense in the second condenser (6) for heat supply; A heat energy grade lifting pipeline (7), wherein the heat energy grade lifting pipeline (7) is arranged between the first condenser (3) and the second evaporator (4) and is used for conveying high-temperature heat energy generated by condensation and heat dissipation of the first condenser (3) to the second evaporator (4) to serve as a high-temperature heat source of the second evaporator (4); And the water vapor heat separation tower is used for filtering the high-temperature flue gas and dispersing heat energy carried by the high-temperature flue gas into filtered high-temperature gas and high-temperature water to serve as a high-temperature heat source of the first evaporator (1) or the second evaporator (4).
  2. 2. The comprehensive utilization system for utilizing the heat pump unit to mix and recycle the waste heat according to claim 1, wherein a first return pipeline (8) is arranged between the first condenser (3) and the first evaporator (1), and a first expansion valve (9) is arranged on the first return pipeline (8).
  3. 3. The comprehensive utilization system for utilizing the heat pump unit to mix and recycle the waste heat according to claim 1, wherein a second reflux pipeline (10) is arranged between the second condenser (6) and the second evaporator (4), and a second expansion valve (11) is arranged on the second reflux pipeline (10).
  4. 4. The comprehensive utilization system for mixed recovery of waste heat by using a heat pump unit according to claim 1, wherein the water vapor heat separation tower comprises: the separation tower body (12), the bottom of the separation tower body (12) is used for collecting water; The high-temperature flue gas pipeline (13) is communicated with the lower end part of the separation tower body (12); The normal-temperature water spraying pipeline (14) is communicated to the upper end part of the separation tower body (12), and a spraying head is arranged on the normal-temperature water spraying pipeline (14) and used for spraying low-temperature water to take away smoke dust and heat energy in high-temperature flue gas; The high-temperature gas conveying main pipeline (15), the high-temperature gas conveying main pipeline (15) is communicated with the top of the separation tower body (12), a first auxiliary pipeline (16) is communicated between the high-temperature gas conveying main pipeline (15) and the first evaporator (1), a first electromagnetic valve (17) is arranged on the first auxiliary pipeline (16), a second auxiliary pipeline (18) is communicated between the high-temperature gas conveying main pipeline (15) and the second evaporator (4), and a second electromagnetic valve (19) is arranged on the second auxiliary pipeline (18); The high-temperature liquid conveying main pipeline (20), high-temperature liquid conveying main pipeline (20) switch-on is in separation tower body (12) bottom, high-temperature liquid conveying main pipeline (20) with switch-on has third auxiliary pipeline (21) between first evaporimeter (1), be provided with third solenoid valve (22) on third auxiliary pipeline (21), high-temperature gas conveying main pipeline (15) with switch-on has fourth auxiliary pipeline (23) between second evaporimeter (4), be provided with fourth solenoid valve (24) on fourth auxiliary pipeline (23).
  5. 5. The comprehensive utilization system for utilizing the heat pump unit to mix and recycle the waste heat according to claim 4, wherein a first temperature sensor (25) is arranged on the main pipeline (15) for transporting the high-temperature gas and positioned at the front ends of the first auxiliary pipeline (16) and the second auxiliary pipeline (18), and a second temperature sensor (26) is arranged on the main pipeline (20) for transporting the high-temperature liquid and positioned at the front ends of the third auxiliary pipeline (21) and the fourth auxiliary pipeline (23).
  6. 6. The comprehensive utilization system for mixed recovery of waste heat by using a heat pump unit according to claim 4, wherein a water filter (27) is arranged on the main pipeline (20) for transporting high-temperature liquid and at the front ends of the third auxiliary pipeline (21) and the fourth auxiliary pipeline (23).
  7. 7. The comprehensive utilization system for utilizing the heat pump unit to mix and recycle the waste heat according to claim 4, wherein a high-temperature waste water spraying pipeline (28) is connected to the upper end part of the separation tower body (12) above the high-temperature flue gas pipeline (13), and a spray header is arranged on the high-temperature waste water spraying pipeline (28) for spraying high-temperature waste water downwards.
  8. 8. The comprehensive utilization system for utilizing the heat pump unit to mix and recycle the waste heat according to claim 4, wherein a water pipe (29) is connected to the lower end part of the separation tower body (12) at a position below the high-temperature flue gas pipeline (13), and the water pipe (29) is used for conveying other water bodies except the waste water into the separation tower body (12).
  9. 9. The comprehensive utilization system for mixed recovery of waste heat by using a heat pump unit according to claim 1, wherein a fifth electromagnetic valve (30) is arranged on the heat energy grade lifting pipeline (7).
  10. 10. The utilization method of the comprehensive utilization system for utilizing the heat pump unit to mix and recycle the waste heat according to any one of claims 1 to 9, comprising the steps of: step one, preparing at least two groups of heat pump units and respectively recovering a low-grade heat source and a high-grade heat source; step two, preparing a heat source recovery end, namely a water vapor heat separation tower, so as to recover the heat energy of high-temperature flue gas and also recover the heat energy of high-temperature water; Step three, after the high-temperature flue gas recovered by the water vapor heat separation tower in the step two is sprayed and filtered by normal-temperature water or high-temperature water, the filtered high-temperature flue gas flows upwards and is conveyed to a low-grade heat energy heat pump unit or a high-grade heat energy heat pump unit for use, and meanwhile, the water with heat carried by the filtered high-temperature flue gas is also conveyed to the low-grade heat energy heat pump unit or the high-grade heat energy heat pump unit for use; step four, the heat energy of the high-temperature flue gas and the high-temperature water in the water vapor heat separation tower is separated into low-grade heat energy and high-grade heat energy according to the temperature, so that the low-grade heat energy and the high-grade heat energy flow to the low-grade heat energy heat pump unit and the high-grade heat energy heat pump unit respectively for use; And fifthly, heat energy generated by the recovery of waste heat by the second condenser (6) in the low-grade heat energy heat pump unit is directly conveyed to the second evaporator (4) in the high-grade heat energy heat pump unit through the heat energy grade lifting pipeline (7) for use so as to upgrade the low-grade waste heat into high-grade waste heat.

Description

Comprehensive utilization system and method for mixed recovery of waste heat by utilizing heat pump unit Technical Field The invention relates to the technical field of waste heat recovery of heat pump units, in particular to a comprehensive utilization system and method for mixed recovery of waste heat by utilizing a heat pump unit. Background The heat pump unit is a device for transferring heat energy of a low-temperature heat source to a high-temperature heat source. To realize cooling and heating. The low temperature heat source commonly used in heat pump devices is our surrounding medium-air, river water, sea water, municipal sewage, surface water, groundwater, reclaimed water, fire water tanks, or working fluids discharged from industrial production facilities, which often have temperatures close to the surrounding medium. The key components include an evaporator, a compressor and a condenser, which work cooperatively to "upgrade" the low-grade waste heat to usable heat energy. At present, the heat pump unit is used for heating low-grade waste heat, but in the application of industrial production, the waste is too high when only heating is performed, and after the working medium discharged from the equipment is recovered, the temperature is only 30-80 ℃, so that the low-grade heat energy is little helpful for industrial production when the device is reused, and the low-grade heat energy needs to be improved into high-grade heat energy for reuse. In addition, the waste gas and the waste water in the industrial production have waste heat and also carry particles, and the entering of the waste gas and the waste water into the heat pump unit can influence the operation of the heat pump unit and the heat exchange efficiency. Meanwhile, the temperature of working media discharged from industrial production equipment is different, so that the temperature is easy to neutralize in the waste heat recovery process, the higher recovery temperature cannot be achieved, the energy is actually wasted, and the problem needs to be improved in order to recycle the preheating more efficiently. Therefore, based on the above technical problems, a person skilled in the art is required to develop a comprehensive utilization system and method for hybrid recovery of waste heat by using a heat pump unit. Disclosure of Invention The invention aims to solve the problems and provide a comprehensive utilization system and method for utilizing heat pump units to mix and recycle waste heat. In order to achieve the above object, the present invention provides the following technical solutions: The invention relates to a comprehensive utilization system for utilizing heat pump unit to mix and recycle waste heat, which comprises: The low-grade heat energy heat pump unit comprises a first evaporator, a first compressor and a first condenser, wherein the first evaporator is communicated with the first compressor to convey a refrigerant for absorbing heat and evaporating to the first compressor for compression, and the first compressor is communicated with the first condenser to convey a gas compressed into high temperature and high pressure to the first condenser so as to enable the refrigerant to dissipate heat and condense in the first condenser for heat supply; the high-grade heat energy heat pump unit comprises a second evaporator, a second compressor and a second condenser, wherein the second evaporator is communicated with the second compressor to convey a refrigerant for absorbing heat and evaporating to the second compressor for compression, and the second compressor is communicated with the second condenser to convey gas compressed into high temperature and high pressure to the second condenser so as to enable the refrigerant to dissipate heat and condense in the second condenser for heat supply; The heat energy grade lifting pipeline is arranged between the first condenser and the second evaporator and used for conveying high-temperature heat energy generated by condensation and heat dissipation of the first condenser to the second evaporator to serve as a high-temperature heat source of the second evaporator; And the water-vapor heat separation tower is used for filtering the high-temperature flue gas and dispersing heat energy carried by the high-temperature flue gas into filtered high-temperature gas and high-temperature water to serve as a high-temperature heat source of the first evaporator or the second evaporator. Further, a first return pipeline is arranged between the first condenser and the first evaporator, and a first expansion valve is arranged on the first return pipeline. Further, a second return pipeline is arranged between the second condenser and the second evaporator, and a second expansion valve is arranged on the second return pipeline. Further, the water vapor thermal separation tower comprises: the bottom of the separation tower body is used for collecting water; the high-temperature flue gas pipeline is c