Comprehensive heat energy utilization system for food industrial park

Abstract

The utility model provides a food industry park heat energy comprehensive utilization system which comprises a refrigerating system, a heat supply system, an energy storage water tank and a first water pump, and the refrigerating system comprises a water chilling unit, a first circulating water inlet pipe and a first circulating water outlet pipe; the heat supply system comprises a high-temperature heat pump unit and a first circulating pipeline; a water inlet of the energy storage water tank is communicated with the other end of the first circulation water outlet pipe, a water outlet of the energy storage water tank is connected with a second circulation pipeline, the first water pump is arranged on the second circulation pipeline, and the second circulation pipeline is divided into two water return pipelines through a tee joint. The first water return pipeline returns to a water inlet of the energy storage water tank through at least one first heat utilization device, and the second water return pipeline returns to a water inlet of an evaporator of the high-temperature heat pump unit. According to the system, a cold supply system and a heat supply system of different production links are combined for supply through pipelines, water is used as a carrier, an energy storage water tank and a water pump are additionally arranged, needed external heat sources and cold sources are matched according to conditions, temperature balance in circulating water is guaranteed through automatic adjustment, and energy consumption utilization of the whole industrial park is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat comprehensive utilization system technical field especially a kind of food industry park heat comprehensive utilization system. BACKGROUND

[0002] With the development of intelligent manufacturing and large-scale production and the integration of industry chain, more and more large-scale food industry parks are built in China, and refrigeration and heating in production and life of the industry park is a major energy consumer. Refrigeration is mainly used in raw material and finished product refrigeration and preservation and product quick-freezing links. The working principle of the cold storage refrigeration unit is mainly based on the refrigeration cycle principle. The refrigerant is compressed into a high-temperature and high-pressure state from a low-temperature and low-pressure state under the action of the compressor, then enters the condenser to release heat and becomes high-temperature and high-pressure liquid refrigerant. Subsequently, the liquid refrigerant enters the evaporator through the expansion valve, rapidly evaporates and absorbs heat in the evaporator, removes the heat of the food, realizes the rapid freezing of the food, and the whole process is a cycle process. Through continuous circulation, the purpose of continuous freezing of food is achieved. On the other hand, a large amount of medium-high temperature hot water is needed in the production process of food. The original heating mainly relies on boiler combustion to generate heat to heat water or steam. Boiler combustion will produce a large amount of carbon dioxide, nitrogen oxides and other emissions, causing environmental pollution. With the guidance of the future national policy of "carbon-free power source and electrification of production and life" and the promotion of new technologies, especially the continuous improvement and development of high-temperature heat pump technology, the heating boiler combustion technology is gradually replaced by heat pump technology.

[0003] While the heat pump discharges a large amount of cold energy during heating, the same industry park needs refrigeration and heating links in the manufacturing industry chain. How to organically combine the two and improve the energy efficiency ratio is our main purpose. SUMMARY

[0004] The utility model provides a kind of food industry park heat comprehensive utilization system, to cold storage water cooling unit, high-temperature heat pump unit as foundation, utilize water as circulating carrier, install energy storage water tank, water pump, and according to situation matching required external heat source, cold source, ensure the temperature balance in circulating water, make the whole system always in high-efficiency operation, reduce the energy consumption utilization of whole industry park.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] The utility model provides a kind of food industry park heat energy comprehensive utilization system, including refrigeration system, heating system, energy storage water tank, first water pump, the refrigeration system includes water cooling unit for the refrigeration of freezer, first circulating water inlet pipe, first circulating water outlet pipe, the first circulating water inlet pipe is connected with the condenser water inlet of water cooling unit, and the condenser water outlet of water cooling unit is connected with the first circulating water outlet pipe, the heating system includes high-temperature heat pump unit, first circulating pipeline, the inlet and outlet of the condenser of high-temperature heat pump unit are connected with first circulating pipeline, and the evaporator water outlet of high-temperature heat pump unit is connected with the other end of first circulating water inlet pipe, the water inlet of energy storage water tank is connected with the other end of first circulating water outlet pipe, and the water outlet of energy storage water tank is connected with second circulating pipeline, and the first water pump is arranged on second circulating pipeline, and second circulating pipeline is divided into two-way return water pipeline by three-way, and first-way return water pipeline returns to energy storage water tank water inlet, and at least one first heat using equipment is arranged on the first-way return water pipeline, and second-way return water pipeline returns to the evaporator water inlet of high-temperature heat pump unit.

[0007] As preferred, the evaporator of the high-temperature heat pump unit is one of liquid-liquid heat exchangers.

[0008] As preferred, at least one second heat using equipment is arranged on the first circulating pipeline, and a second water pump is arranged on the first circulating pipeline close to the condenser water inlet of high-temperature heat pump unit.

[0009] As preferred, a first electromagnetic valve is arranged on the first-way return water pipeline close to one end of the first water pump.

[0010] As preferred, an air-cooled heat pump unit is arranged on the second-way return water pipeline, and the inlet and outlet water pipes of the water side heat exchanger of the air-cooled heat pump unit are arranged on the second-way return water pipeline.

[0011] As preferred, a cooling tower is arranged on the second-way return water pipeline, a second electromagnetic valve is arranged on the second-way return water pipeline between the water inlet pipe and the water outlet pipe of the cooling tower, a third electromagnetic valve is arranged on the water inlet pipe of the cooling tower, and a valve is arranged on the water outlet pipe of the cooling tower.

[0012] Compared with the prior art, the utility model has the beneficial effects that: the system supplies cold and heat systems of different production links through pipeline, uses water as carrier, adds energy storage water tank and water pump, matches required external heat source and cold source according to conditions, balances temperature in circulating water through automatic adjustment, so that the whole system is always in efficient operation, and energy consumption of the whole industrial park is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Fig. 1, water cooling unit; 2, high temperature heat pump unit; 3, first circulating water inlet pipe; 4, first circulating water outlet pipe; 5, first circulating pipe; 6, second circulating pipe; 7, first water pump; 8, first heat using equipment; 9, second heat using equipment; 10, second water pump; 11, first electromagnetic valve; 12, second electromagnetic valve; 13, third electromagnetic valve; 14, valve. DETAILED DESCRIPTION

[0015] The utility model provides a kind of food industry park heat energy comprehensive utilization system, with cold storage water cooling unit, high temperature heat pump unit as foundation, use water as circulating carrier, add energy storage water tank, water pump, and according to situation matching required external heat source, cold source, by automation adjustment, ensure the temperature balance in circulating water, so that the whole system is always in efficient operation, reduce the energy consumption utilization of whole industry park.

[0016] Specifically, including refrigeration system, heating system, energy storage water tank, first water pump 7, the refrigeration system includes water cooling unit 1 for refrigerating cold storage, first circulating water inlet pipe 3, first circulating water outlet pipe 4, the first circulating water inlet pipe 3 is connected with the condenser water inlet of water cooling unit 1 and communicates, the first circulating water outlet pipe 4 is connected with the condenser water outlet of water cooling unit 1 and communicates;The heating system includes high temperature heat pump unit 2, first circulating pipe 5, the inlet and outlet of the condenser of high temperature heat pump unit 2 and first circulating pipe 5 are connected with the other end of first circulating water inlet pipe 3 and communicate with the evaporator water outlet of high temperature heat pump unit 2;The water inlet of energy storage water tank is connected with the other end of first circulating water outlet pipe 4, and the water outlet of energy storage water tank is connected with second circulating pipe 6, and first water pump 7 is arranged on second circulating pipe 6, and second circulating pipe 6 is divided into two return water pipes by three-way, and first return water pipe returns to energy storage water tank water inlet, at least one first heat using equipment 8 is arranged on the first return water pipe, and second return water pipe returns to the evaporator water inlet of high temperature heat pump unit 2.Here, first heat using equipment refers to equipment using medium-temperature hot water, such as park heating, equipment using medium-temperature hot water.

[0017] The water in the first circulating water pipe is low-temperature circulating water. The low-temperature circulating water enters the condenser of the water-cooled unit to absorb heat, so that the temperature of the circulating water rises to medium-high temperature. Then, under the action of the first water pump, the circulating water enters the energy storage water tank. The hot water in the energy storage water tank is divided into two paths. One path passes through at least one first heat utilization device and then returns to the energy storage water tank. In this process, the temperature of the water decreases. The number of the first heat utilization devices is approximately proportional to the temperature decrease. After several cycles, the temperature of the water in the energy storage water tank decreases to medium temperature. The other path enters the evaporator of the high-temperature heat pump unit to be heated, so that the temperature of the circulating water decreases to low temperature, and then the circulating water enters the condenser of the water-cooled unit for the next cycle. In this way, the energy storage water tank is used to increase the water volume of the circulating water, so that the water in the energy storage water tank is maintained at a medium temperature, and the temperature change of the circulating water passing through the first heat utilization device is stable.

[0018] In this embodiment, the high-temperature heat pump unit is a cold-hot water type high-temperature heat pump unit, and the evaporator thereof is a type of liquid-liquid heat exchanger. The medium-temperature circulating water after cooling passes through the evaporator of the high-temperature heat pump unit. The circulating water is heated and becomes low-temperature circulating water, which enters the refrigeration system. Correspondingly, the first circulating pipe connected to the water inlet and outlet of the condenser of the high-temperature heat pump unit is filled with high-temperature water.

[0019] Further, at least one second heat utilization device 9 is arranged on the first circulating pipe 5, and a second water pump 10 is arranged on the first circulating pipe close to the water inlet of the condenser of the high-temperature heat pump unit. Here, the second heat utilization device refers to a device that uses high-temperature water. Here, it mainly refers to a heat dissipation pipe arranged in a drying area. The heat dissipation pipe is provided with fins, and high-temperature steam is formed under the action of a fan to achieve food drying.

[0020] Further, a first electromagnetic valve 11 is arranged on the first return water pipe close to one end of the first water pump 7. When the second heat utilization device is not in use, the first electromagnetic valve can be closed to save energy.

[0021] The water-cooled unit, also known as a water-cooled refrigeration unit or a water-cooled chiller unit, is a product of the prior art and mainly includes a compressor, an evaporator, a condenser, an expansion valve, etc. Its working principle is as follows: the refrigerant in the evaporator absorbs the heat of the cooled material and vaporizes into steam in the process. The chilled water in the evaporator is cooled, pressurized by a chilled pump, and then sent to the water pipe in the cold storage to exchange heat with the cold storage, thereby driving the heat in the cold storage and lowering the temperature in the cold storage. The compressor continuously extracts the generated steam from the evaporator and compresses it. The compressed steam becomes high-temperature and high-pressure gas and releases heat to the cooling medium (low-temperature circulating water) in the condenser, thereby condensing into high-pressure liquid. According to different needs, the required temperature for refrigeration, preservation, and quick freezing can be achieved. In this embodiment, the first circulating water inlet pipe and the first circulating water outlet pipe are respectively connected to the water inlet and outlet of the condenser of the water-cooled unit to heat the low-temperature circulating water.

[0022] Considering that the first heat using equipment is arranged more, the water temperature after multiple cycles does not meet the required heat of the high temperature heat pump unit, at this time, it can be understood that the heating capacity of the water cooling unit to the circulating water is less than the refrigerating capacity of the high temperature heat pump unit to the circulating water. Therefore, the second return water pipeline is also arranged with the air-cooled heat pump unit, and the water inlet and outlet pipes of the water side heat exchanger of the air-cooled heat pump unit are arranged on the second return water pipeline. When the circulating water temperature meets the required heat of the high temperature heat pump unit, the circulating water only passes through the unit, but the air-cooled heat pump unit does not work to heat, and when the circulating water temperature does not meet the required heat of the high temperature heat pump unit, the air-cooled heat pump unit starts to realize heating cycle, and the circulating water passing through the water side heat exchanger of the air-cooled heat pump unit is heated.

[0023] The air-cooled heat pump unit is a heat pump type air-cooled module, which integrates refrigeration and heating functions, and at least one four-way reversing valve is added inside, which is used for switching the refrigeration or heating function. In addition to the function of producing cold water, it can also be switched to a heating working condition to produce hot water. In the refrigeration mode: the high-temperature gas of the refrigerant discharged by the compressor is condensed into liquid in the air side heat exchanger, is throttled and reduced in pressure by the throttle valve, enters the water side heat exchanger, evaporates after absorbing heat and returns to the compressor, to complete a refrigeration cycle; at the same time, the circulating water is cooled after passing through the water side heat exchanger. In the heating mode: the high-temperature gas of the refrigerant discharged by the compressor is condensed into liquid in the water side heat exchanger, is throttled and reduced in pressure by the throttle valve, enters the air side heat exchanger, evaporates after absorbing heat and returns to the compressor, to complete a heating cycle; at the same time, the circulating water is heated after passing through the water side heat exchanger. In this embodiment, the heating module of the air-cooled module unit is mainly used to produce hot water, and specifically, the water inlet and outlet pipes of the water side heat exchanger are arranged on the second return water pipeline.

[0024] In addition, considering that the first heat using equipment is arranged less or is not in use, even if the air-cooled heat pump unit is not started, the water temperature is still high after multiple cycles, at this time, it can be understood that the heating capacity of the water cooling unit to the circulating water is greater than the refrigerating capacity of the high temperature heat pump unit to the circulating water. Therefore, the second return water pipeline is also arranged with a cooling tower, a second electromagnetic valve 12 is arranged on the second return water pipeline between the water inlet pipe and the water outlet pipe of the cooling tower, a third electromagnetic valve 13 is arranged on the water inlet pipe of the cooling tower, and a valve 14 is arranged on the water outlet pipe of the cooling tower. When the circulating water temperature is high, the second electromagnetic valve 12 is closed, the third electromagnetic valve 13 and the valve 14 are opened, and the circulating water is cooled by the cooling tower to meet the requirements. When the circulating water temperature meets the requirements, the second electromagnetic valve 12 is opened, the third electromagnetic valve 13 and the valve 14 are closed, and the circulating water does not pass through the cooling tower. The valve 14 can be an electromagnetic valve or a common valve, and is preferably an electromagnetic valve, which mainly avoids the backflow of water into the cooling tower, affecting the circulating water temperature and the circulating process.

[0025] Cooling tower, belonging to prior art product, is a device for cooling water, heat transfer is realized by air and water contact. Water enters the cooling tower through the water inlet pipe, the water is sprayed out by the spraying device, cooled by air, falls into the water tank at the bottom of the cooling tower and is led out through the water outlet pipe. In the embodiment, the water inlet pipe and the water outlet pipe of the cooling tower are arranged on the second water return pipeline.

[0026] In addition, the system further comprises a PLC control system, which mainly comprises an electric control cabinet, a PLC, a temperature probe sensor, a control screen and the like. When the high-temperature heat pump unit detects that the temperature of the circulating water entering the evaporator is greater than the set temperature, it can be considered that the refrigerating capacity of the high-temperature heat pump unit for the circulating water is less than the heating capacity of the water-cooled unit, the circulating water temperature rises, which is not conducive to the refrigeration working condition of the water-cooled unit and reduces the refrigeration efficiency. At this time, the second electromagnetic valve is closed, the third electromagnetic valve and the valve 14 are opened, the circulating water enters the cooling tower for cooling and then enters the high-temperature heat pump unit. When the high-temperature heat pump unit detects that the temperature of the circulating water entering the evaporator is less than the set temperature, it can be considered that the refrigerating capacity of the high-temperature heat pump unit for the circulating water is greater than the heating capacity of the water-cooled unit, the circulating water temperature decreases, which is not conducive to the heating working condition of the high-temperature heat pump unit and reduces the heating effect. At this time, the circulating water does not enter the cooling tower, the air-cooled heat pump unit is started, the circulating water passing through is heated by using the heating working condition, and the heated circulating water enters the high-temperature heat pump unit. The whole system is automatically adjusted to ensure the temperature balance of the circulating water, so that the whole system is always in high-efficiency operation and the energy consumption of the whole industrial park is reduced.

Claims

1. A heat energy comprehensive utilization system for a food industry park, characterized in that: The application relates to a refrigeration system, a heating system, an energy storage water tank, a first water pump, wherein the refrigeration system comprises a water cooling unit for refrigerating a cold storage, a first circulating water inlet pipe and a first circulating water outlet pipe; the first circulating water inlet pipe is connected with a condenser water inlet of the water cooling unit; the first circulating water outlet pipe is connected with a condenser water outlet of the water cooling unit; the heating system comprises a high-temperature heat pump unit and a first circulating pipeline; the condenser water inlet and outlet of the high-temperature heat pump unit are connected with the first circulating pipeline; the evaporator water outlet of the high-temperature heat pump unit is connected with the other end of the first circulating water inlet pipe; the water inlet of the energy storage water tank is connected with the other end of the first circulating water outlet pipe; the water outlet of the energy storage water tank is connected with a second circulating pipeline; the first water pump is arranged on the second circulating pipeline; the second circulating pipeline is divided into two return water pipelines through a three-way pipe; the first return water pipeline returns to the water inlet of the energy storage water tank; at least one first heat utilization equipment is arranged on the first return water pipeline; the second return water pipeline returns to the evaporator water inlet of the high-temperature heat pump unit.

2. The system according to claim 1, wherein: The evaporator of the high-temperature heat pump unit is a kind of liquid-liquid heat exchanger.

3. The system according to claim 1, wherein: At least one second heat utilization equipment is arranged on the first circulating pipeline; a second water pump is arranged on the first circulating pipeline close to the condenser water inlet of the high-temperature heat pump unit.

4. The system according to claim 1, wherein: A first electromagnetic valve is arranged on the first return water pipeline close to one end of the first water pump.

5. The system according to claim 1, wherein: An air-cooled heat pump unit is arranged on the second return water pipeline; the water inlet and outlet of the water side heat exchanger of the air-cooled heat pump unit are arranged on the second return water pipeline.

6. The system according to claim 1, wherein: A cooling tower is arranged on the second return water pipeline; a second electromagnetic valve is arranged on the second return water pipeline between the water inlet and outlet of the cooling tower; a third electromagnetic valve is arranged on the water inlet of the cooling tower; a valve is arranged on the water outlet of the cooling tower.

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