CN-121977304-A - Dual-source cold and hot combined supply steam heat pump system and control method

CN121977304ACN 121977304 ACN121977304 ACN 121977304ACN-121977304-A

Abstract

The application relates to the technical field of heat pumps, and discloses a dual-source cold and hot combined supply steam heat pump system and a control method, wherein the cold and hot combined supply steam heat pump system comprises a heat pump circulation loop formed by connecting an air heat exchanger, a first compressor, a condenser and a first expansion valve; the condenser comprises a first refrigerant heat exchange channel and a first heat medium heat exchange channel which exchange heat mutually, wherein the first refrigerant heat exchange channel is used for being connected into a heat pump circulation loop, the first evaporator is connected into the heat pump circulation loop in a parallel connection mode with the air heat exchanger, the first evaporator and the air heat exchanger can be alternately or simultaneously connected into the heat pump circulation loop, the cold supply side structure is connected with the first evaporator, the steam supply side structure can absorb heat released by the condenser to produce steam, a cold and heat combined supply working mode is realized when the first evaporator is connected into the heat pump circulation loop only, a single steam working mode is realized when the air heat exchanger is connected into the heat pump circulation loop only, a steam boiler can be completely replaced, and the refrigeration requirement is met.

Inventors

DU WEIWEI
HUANG GUOHUA
LI SHAOFEI
GU ZAIFENG
SUN CAI
ZHAO JINZI
ZHANG YING
WANG LIWEI
HAN LINJUN

Assignees

同方节能工程技术有限公司
同方股份有限公司

Dates

Publication Date: 20260505
Application Date: 20251126

Claims (10)

1. A dual source heat and cold combined supply steam heat pump system, comprising: The heat pump circulation loop is formed by connecting components comprising an air heat exchanger, a first compressor, a condenser and a first expansion valve, wherein the condenser comprises a first refrigerant heat exchange channel and a first heat medium heat exchange channel which are mutually heat exchanged, and the first refrigerant heat exchange channel is used for being connected into the heat pump circulation loop; the first evaporator is connected into the heat pump circulation loop in parallel with the air heat exchanger, and the first evaporator and the air heat exchanger can be connected into the heat pump circulation loop alternately or simultaneously; The cooling side structure is connected with the first evaporator and can utilize the cooling capacity released by the first evaporator to supply cooling capacity; The steam supply side structure is connected with the first heat medium heat exchange channel and can absorb heat released by the condenser to generate steam; when the first evaporator is connected into the heat pump circulation loop, a combined cooling and heating working mode is realized; when the air heat exchanger is connected into the heat pump circulation loop, a single-steam working mode is realized.
2. The dual source heat and cold combined steam heat pump system according to claim 1, wherein the steam side structure comprises a heat storage medium device and a steam heat pump structure, the first heat medium heat exchange channel of the condenser is connected with the heat storage medium device and the evaporator of the steam heat pump structure, so that the heat released by the condenser heats the heat medium in the heat storage medium device and/or the steam is produced by the steam heat pump structure, or the steam heat pump structure absorbs the heat of the heat medium of the heat storage medium device to produce steam under the condition that the heat pump circulation loop is not operated.
3. The dual source heat and cold combined supply steam heat pump system according to claim 2, wherein the steam heat pump structure is formed by connecting components comprising a second evaporator, a second compressor, a second expansion valve and a steam generator, and the second evaporator is connected with the first heat medium heat exchange channel of the condenser and the heat storage medium device so as to absorb heat through the second evaporator in the steam production process of the steam heat pump structure.
4. The dual-source heat and cold combined supply steam heat pump system according to claim 3, wherein a second heat medium heat exchange channel and a second refrigerant heat exchange channel are arranged in the second evaporator, the second refrigerant heat exchange channel is connected with the second compressor, the second expansion valve and the steam generator to form a steam supply heat pump loop, and the second heat medium heat exchange channel is connected with the heat storage medium device and the first heat medium channel of the condenser to form a heat storage loop.
5. The dual source combined heat and cold steam heat pump system according to any one of claims 1 to 4, wherein a first refrigerant heat exchanger and a second refrigerant heat exchanger are arranged in the air heat exchanger, the first refrigerant heat exchanger is used for being connected in series to the heat pump circulation loop, and the second refrigerant heat exchanger is connected with a first heat medium heat exchange channel of the condenser to form a heat release loop so as to operate a single cooling work mode when the heat release loop is communicated and the first evaporator is connected to the heat pump circulation loop; In the case that the steam supply side structure includes a heat storage medium device and a steam supply heat pump structure, the heat storage medium device can be connected to the heat release circuit to store the heat released from the condenser to the heat storage medium device in the case that the single cooling operation mode is operated and the heat in the heat storage medium device is insufficient.
6. The dual-source heat and cold combined supply steam heat pump system according to any one of claims 1 to 4, wherein the cold supply side structure comprises a cold storage medium device, the first evaporator is connected with the cold storage medium device, and the first evaporator exchanges heat with the cold medium in the cold storage medium device to cool the cold medium in the cold storage medium device.
7. The dual-source heat and cold combined supply steam heat pump system according to any one of claims 1 to 4, wherein a second refrigerant heat exchange channel and a cooling medium heat exchange channel which exchange heat mutually are arranged in the first evaporator, the second refrigerant heat exchange channel of the first evaporator is used for being connected in parallel to a heat pump circulation loop, and the cooling medium heat exchange channel is connected with a cold supply side structure.
8. A control method of a dual-source combined heat and power steam heat pump system, which is characterized in that the control method is applied to the dual-source combined heat and power steam heat pump system according to any one of claims 1 to 7, and comprises the following steps: under the condition that steam supply is needed and cooling is not needed, the air heat exchanger is controlled to be connected into the heat pump circulation loop, the heat pump circulation loop and the steam supply side structure are operated, so that the heat released by the condenser is used for generating steam by the steam supply side structure, and/or Under the condition that the cold quantity of the cold supply side structure is insufficient, the air heat exchanger is controlled to cut out of the heat pump circulation loop, the first evaporator is connected into the heat pump circulation loop, or the first evaporator and the air heat exchanger are controlled to be connected into the heat pump circulation loop at the same time, the heat pump circulation loop is operated, and the cold quantity released by the first evaporator is supplied to the cold supply side structure.
9. The control method according to claim 8, wherein, In the case where the steam supply side structure includes the heat storage medium device and the steam supply heat pump structure, the control method further includes: And under the condition that the temperature of the thermal medium in the thermal medium storage device is greater than a first threshold value, closing the heat pump circulation loop, and using the heat released by the thermal medium storage device for generating steam by the steam side structure.
10. The control method according to claim 8, wherein, The control method further comprises the steps of controlling the heat pump circulation loop to be connected with only the first evaporator and conducting the heat release loop when the cold quantity of the cold supply side structure is insufficient and the temperature of the heat medium in the heat supply or storage medium device is not required to be higher than a first threshold value, supplying the cold quantity released by the first evaporator to the cold supply side structure, and releasing the heat released by the condenser to the environment through the heat release loop Under the condition that the dual-source combined cooling and heating steam heat pump system comprises a heat release loop and a heat storage medium device can be connected into the heat release loop, the control method further comprises the steps of controlling the heat pump circulation loop to be connected into a first evaporator only and conducting the heat release loop under the condition that the cooling capacity of the cooling side structure is insufficient and the heat in the heat storage medium device is insufficient and steam supply is not needed, supplying the cooling capacity released by the first evaporator to the cooling side structure, and releasing the heat released by the condenser into the heat storage medium device or simultaneously into the heat storage medium device and the environment through the heat release loop.

Description

Dual-source cold and hot combined supply steam heat pump system and control method Technical Field The application relates to the technical field of heat pumps, in particular to a double-source cold and hot combined supply steam heat pump system and a control method. Background The steam heat pump is used as a novel energy-saving device for preparing steam by steam supply. At present, a waste heat recovery type steam heat pump is adopted when waste heat exists, an air source steam heat pump is adopted when no waste heat exists, and meanwhile, a single refrigerator is generally adopted for refrigeration when a user has refrigeration requirements. The existing heat recovery type steam heat pump can operate efficiently, but can only be used when the waste heat exists and the temperature of the waste heat meets the requirement, the problem of mismatching between the waste heat and the heat utilization time can not completely replace a steam boiler, and the air source steam heat pump can replace the steam boiler, but absorbs heat in the air, so that the operation efficiency is low. Meanwhile, both the waste heat recovery type steam heat pump and the air source steam heat pump can not meet the refrigeration requirement, for example, the existing cold and hot combined supply type steam heat pump system can not meet the requirements of steam production and cold supply only by simultaneously operating the low-temperature heat pump and the high-temperature heat pump. It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the application and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art. Disclosure of Invention The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows. The embodiment of the disclosure provides a dual-source cold and hot combined supply steam heat pump system and a control method, which can completely replace a steam boiler to supply steam, solve the problem of mismatching of waste heat and heat utilization time, and can also consider the refrigeration requirement through cold and hot combined supply. In some embodiments, the dual-source combined heat and power steam heat pump system comprises a heat pump circulation loop formed by connecting components comprising an air heat exchanger, a first compressor, a condenser and a first expansion valve, wherein the condenser comprises a first refrigerant heat exchange channel and a first heat medium heat exchange channel which are mutually used for exchanging heat, the first refrigerant heat exchange channel is used for being connected with the heat pump circulation loop, the first evaporator is connected with the heat pump circulation loop in a parallel connection mode, the first evaporator and the air heat exchanger can be connected with the heat pump circulation loop alternately or simultaneously, a cold supply side structure is connected with the first evaporator and can utilize cold energy released by the first evaporator for cold energy, a steam supply side structure is connected with the first heat medium heat exchange channel and can absorb heat released by the condenser for steam production, and a single-steam working mode is realized when only the first evaporator is connected with the heat pump circulation loop. Optionally, the steam supply side structure includes a heat storage medium device and a steam supply heat pump structure, the first heat medium heat exchange channel of the condenser is connected with the heat storage medium device and the evaporator of the steam supply heat pump structure, so that the heat released by the condenser heats the heat medium in the heat storage medium device and/or the steam supply heat pump structure utilizes the steam to generate, or the steam supply heat pump structure absorbs the heat of the heat medium of the heat storage medium device to generate the steam under the condition that the heat pump circulation loop does not operate. Optionally, the steam supply heat pump structure is formed by connecting components including a second evaporator, a second compressor, a second expansion valve and a steam generator, wherein the second evaporator is connected with a first heat medium heat exchange channel of the condenser and a heat storage medium device so as to absorb heat through the second evaporator in the steam production process of the steam supply heat pump structure. Optionally, a second heat medium heat exchange channel and a second refrigerant heat exchange channel are arranged in the second evaporator, the second refrigerant heat exchange channel is conne