CN211782326U - Heat pump and steam combined cold and hot water balancing system - Google Patents
Heat pump and steam combined cold and hot water balancing system Download PDFInfo
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- CN211782326U CN211782326U CN202020063758.0U CN202020063758U CN211782326U CN 211782326 U CN211782326 U CN 211782326U CN 202020063758 U CN202020063758 U CN 202020063758U CN 211782326 U CN211782326 U CN 211782326U
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Abstract
The application discloses heat pump steam combined's hot and cold water balanced system, hot and cold water balanced system includes first cooling system, steam heating system, heat accumulation hot-water tank, double-effect heat pump set, triple-effect heat pump set, cold-storage cold water storage cistern and cold system that looses. This application combines the actual production application, in the high-humidity material drying process such as to agricultural product, aquatic products, the difficult balanced control of cold and heat volume application, consider this current situation that loses one another, a hot and cold water balanced system that heat pump steam is united is proposed, design economic benefits and social benefits heat pump set, triple effect heat pump set and steam heating system jointly prepare the hot and cold water, separately store the hot and cold water in the hot and cold water tank, supply with the required cold and hot of agricultural product drying-house, realize one holds in the palm many, reduce equipment initial investment cost, reduce the loss of cold and heat volume in the drying process, practice thrift dry total cost.
Description
Technical Field
The application relates to the field of heat energy utilization and electrical control, in particular to a heat pump and steam combined cold and hot water balancing system.
Background
The drying of agricultural products is a field with large energy consumption, and the main heat sources for drying the traditional agricultural products are steam, combustion of mineral fuel, combustion of firewood and the like. In recent years, the country advocates green and harmonious development, and people pay much attention to the dehumidification and drying technology of agricultural product water sources or air source heat pumps. In fact, except for the heat pump dehumidification and drying, the agricultural product drying of other heat sources adopts a dehumidification mode, so that a large amount of high-temperature and high-humidity air is exhausted to the environment, the energy waste is caused, and the environment is also subjected to heat pollution. The main heat energy source of the heat pump dehumidification drying is water (or air), and the heat energy in the water and the air is cheap and even used for no compensation, so that the energy consumption cost is greatly reduced. The heat pump dehumidification drying machine has the advantages that energy is saved, cold and heat are effectively recycled, the cold end of the heat pump dehumidification drying machine is used as an evaporator and mainly plays a role in dehumidification, and the hot end of the heat pump dehumidification drying machine is used as a condenser and mainly plays a role in temperature rise, so that the heat pump dehumidification drying machine can almost achieve full-closed drying when applied to drying of certain agricultural products. However, the amount of cold and heat required for the drying process of agricultural products cannot be completely matched with the amount of cold and heat produced by the heat pump dehumidification dryer. Therefore, the heat supply is sufficient in the drying process of the agricultural product heat pump, the cold quantity is not enough to meet the dehumidification, and at the moment, only the dehumidification fan is adopted to discharge damp heat.
In conclusion, no matter the dehumidification drying by steam and the like or the dehumidification drying by a heat pump are adopted, the balanced cold and heat requirements in the agricultural product drying process are difficult to meet.
Disclosure of Invention
To the problem that prior art exists, this application provides a heat pump steam combined's hot and cold water balanced system to satisfy the balanced demand of the cold volume in the agricultural product stoving in-process better.
In order to realize the task, the following technical scheme is adopted in the application:
the utility model provides a hot and cold water balanced system that heat pump steam is united, includes first cooling system, steam heating system, heat accumulation hot-water tank, economic benefits and social benefits heat pump set, three-effect heat pump set, cold-storage cold-water tank and cold system that looses, wherein:
the first heat dissipation system is connected with the heat storage hot water tank and used for circularly dissipating redundant heat to maintain the temperature of water in the heat storage hot water tank;
the steam heating system is connected with the heat storage hot water tank, and comprises a heat release system and a heat exchange loop, wherein the heat release system is used for providing heat of steam to the heat storage hot water tank through the heat exchange loop in a heat exchange mode so as to provide hot water to the heat storage hot water tank;
the double-effect heat pump unit and the triple-effect heat pump unit respectively form a heating loop and a refrigerating loop with the heat storage hot water tank and the cold storage cold water tank, and are used for simultaneously providing prepared cold water and hot water for the heat storage hot water tank and the cold storage cold water tank; the triple-effect heat pump unit is connected with a second heat dissipation system, and the triple-effect heat pump unit realizes the function of independently preparing cold water through the second heat dissipation system;
the cold dissipation system is connected to the cold accumulation cold water tank and used for balancing the cold quantity of the cold accumulation cold water tank and dissipating redundant cold quantity of the cold accumulation cold water tank in a circulating mode.
Further, the first heat dissipation system comprises a first cooling tower, a first water pump and a first ball valve, wherein a water outlet of the thermal storage hot water tank is connected with a water inlet of the first cooling tower, a water outlet of the first cooling tower is connected with a water inlet of the first water pump, a water outlet of the first water pump is connected with a water inlet of the thermal storage hot water tank so as to form a hot water circulation loop, and the first ball valve is arranged on a pipeline between the thermal storage hot water tank and the first cooling tower.
Furthermore, a heat release loop of the steam heating system comprises a steam inlet, a steam plate heat exchanger, a cooling water tank, a vortex flow meter, a first stop valve, a second stop valve, a third stop valve, a drain valve and an electromagnetic valve, wherein the steam inlet is connected with a heat source inlet of the steam plate heat exchanger through a pipeline, and a heat source outlet of the steam plate heat exchanger is connected with the cooling water tank through a pipeline; the first stop valve, the electromagnetic valve, the second stop valve and the vortex shedding flowmeter are sequentially arranged on a pipeline between the steam inlet and the steam plate type heat exchanger, and the third stop valve and the drain valve are sequentially arranged on a pipeline between the steam plate type heat exchanger and the cooling water tank.
Furthermore, the heat exchange loop of the steam heating system comprises a second water pump, a second ball valve, a third ball valve and a first water flow switch, the water outlet of the heat storage hot water tank is connected with the cooling water inlet of the steam plate type heat exchanger through a pipeline, and the cooling water outlet of the steam plate type heat exchanger is connected with the water inlet of the heat storage hot water tank through a pipeline, so that an independent hot water making loop is formed; the first water flow switch, the second ball valve, the second water pump and the third ball valve are sequentially arranged on a pipeline between the water outlet of the heat storage hot water tank and the cooling water inlet of the steam plate type heat exchanger.
Furthermore, the double-effect heat pump unit comprises a plurality of cold and hot water subsystems, wherein each cold and hot water subsystem is respectively used for preparing cold water and hot water, each cold and hot water subsystem comprises a compressor, a condenser, an evaporator, an expansion valve, a gas-liquid separator and a liquid storage device, all the components are connected through copper pipes, a refrigerant flows in the copper pipes, the refrigerant absorbs heat at the evaporator and releases heat at the condenser;
the evaporators of the subsystems and the cold storage cold water tanks form a refrigeration loop through cold water pipes, and the condensers of the subsystems and the heat storage hot water tanks are connected through hot water pipes to form a heating loop.
Furthermore, the triple-effect heat pump unit is based on the double-effect heat pump unit, a condenser is additionally arranged in each cold and hot water subsystem, and the second heat dissipation system is arranged on the triple-effect heat pump unit.
Further, when the heat pump steam combined cold and hot water equalization system is applied to a drying room, the cold and hot water equalization system provides cold and hot water for the drying room, feedback adjustment is carried out by detecting the temperature of the cold and hot water, and cold and hot water transmission among the drying room, a cold storage cold water tank and a heat storage hot water tank is controlled by a circulating water pump and a water electromagnetic valve;
the heat required by the drying room when the moisture in the fresh agricultural products is removed is provided by the heat storage hot water tank, the heat storage hot water tank is connected with a heater of the drying room through a pipeline, the hot water exchanges heat with air through the heater in the drying room to heat an air medium in the drying room, the air medium is conveyed by the fan to circulate in the drying room, advection passes through the material area to exchange heat with the high-humidity fresh agricultural products in a convection manner, the air medium becomes a high-humidity air medium and then flows back to pass through the dehumidifier, the dehumidifier is connected with a cold storage cold water tank of the system through a pipeline, the high-humidity air medium meets a cold pipe of the dehumidifier, liquefaction and dehumidification are changed into a low-temperature low-humidity air medium and then passes through the heater, the constant-humidity heating is the high-temperature air medium, the drying medium circulates in.
Further, if the fact that the cold water temperature is decreased at a high rate and the hot water temperature is increased at a low rate is detected, the three-effect heat pump unit is preferentially closed, and when the cold water temperature in the cold storage cold water tank reaches a set value and the hot water temperature in the heat storage hot water tank does not reach the set value, the steam heating system is started to independently prepare hot water; if the rising rate of the hot water temperature is detected to be high and the distance between the cold water temperature and the set temperature value is detected to be large, the starting number of the double-effect heat pump units is gradually reduced, and when the hot water temperature reaches the set temperature value, the single water refrigerating function of the triple-effect heat pump units is started.
Further, the number of the on-off double-effect heat pump units, the number of the three-effect heat pump units and the steam heating system are determined by setting a plurality of hot water temperature deviation values, and when the actually measured hot water temperature and the target temperature reach different temperature values, the corresponding number of double-effect heat pump units, the corresponding number of three-effect heat pump units and the corresponding number of steam heating systems are turned on or off respectively.
A control method of a heat pump and steam combined cold and hot water equalizing system comprises the following steps:
detecting hot water temperature T in heat storage hot water tankhWhether the temperature is lower than the preset hot water early warning temperature and the cold water temperature T in the cold storage cold water tankcWhether the temperature is higher than the preset cold water early warning temperature and is always increased, if so, alarming is carried out;
when the hot water temperature is equal to the target temperature Th0Difference Δ T betweenhWhen the temperature is greater than the set temperature threshold value Qaa, and the temperature of the cold water is equal to the target temperature Tc0Difference Δ T betweencWhen Q < a, executing step 4-1;
when the hot water temperature is equal to the target temperature Th0Difference Δ T betweenhWhen the temperature is less than the set temperature threshold value Qaa, and the temperature of the cold water is equal to the target temperature Tc0Difference Δ T betweencIf the value is more than Q a, executing the step 4-2;
wherein Q is m + P;
step 4-1, closing the P triple-effect heat pump units, starting a steam heating system, taking the temperature of a ℃ as a step, and gradually closing the double-effect heat pump units and the steam heating system in the process that the hot water temperature and the cold water temperature reach the corresponding target temperatures;
step 4-2, a second heat dissipation system of the triple-effect heat pump unit is started, the triple-effect heat pump unit is converted into a single refrigeration mode, the temperature a ℃ is taken as a step, and the double-effect heat pump unit and the triple-effect heat pump unit are gradually closed in the process that the hot water temperature and the cold water temperature reach the corresponding target temperatures;
and 5, when the hot water temperature and the cold water temperature reach the corresponding target temperatures, opening cold and hot water pipelines between the balance system and the drying room, so that cold water and hot water are respectively supplied to a heater and a dehumidifier of the drying room, and the drying room is heated and dehumidified by using the supplied cold and hot water until the moisture of the agricultural products is dried to meet the requirements.
The application has the following technical characteristics:
1. the hot and cold water is prepared and is saved respectively through steam heating system, economic benefits and social benefits heat pump set, the integration of triple effect heat pump set in this application, has constructed a hot and cold water balanced system, supplies cold volume and heat to the baking house through hot and cold water balanced system, because cold volume and the heat of balanced system are greater than the baking house demand far away, consequently the cold and hot volume of a plurality of baking houses can generally be supplied with to a system.
2. The hot pump host system of the cold and hot water equalizing system is used for preparing cold and hot water and supplying cold and hot water to the drying room, namely the working condition parameters of the hot pump system for preparing the cold and hot water are basically constant values, so that the COP value of the heat pump system is improved to the maximum extent, and the loss of refrigeration parts such as a compressor and the like caused by frequent switching of the heat pump system is reduced.
3. The cold and hot water equalizing system is applied to agricultural product drying and processing, compares and uses single heat pump dehumidification dryer, can store unnecessary cold volume in earlier stage, supplements cold volume at agricultural product high temperature and high humidity dehumidification stage, realizes cold and heat volume cyclic utilization.
4. The cold and hot water balance system can be used for agricultural product processing enterprises, more than one system can be realized, redundant cold energy can be used for cooling workshops, and the waste heat water can be used as domestic water through purification; in addition, the refrigerating and heating system is independent of the drying room, so that the refrigerating and heating host system can be completely used for a cooling and heating air conditioner, a fresh-keeping warehouse and the like in the off-season of agricultural product drying, and the utilization efficiency of the refrigerating and heating host system is higher than that of a heat pump dehumidification dryer system.
5. The heating coefficient of the cold and hot water equalizing system can reach 3-4, and compared with similar equipment, the equipment investment cost and the power consumption energy consumption in the operation process can be effectively saved in the process of treating the same agricultural product drying.
Drawings
Fig. 1 is a schematic layout structure diagram of a hot and cold water equalization system of a heat pump steam combination according to the present application;
FIG. 2 is a schematic diagram of the heat pump and steam combined cold and hot water equalizing system applied to a drying room for agricultural product drying processing;
FIG. 3 is a block diagram of a first heat dissipation system;
FIG. 4 is a block diagram of a steam heating system;
fig. 5 is a schematic control flow diagram of the heat pump and steam combined cold and hot water equalization system applied to a drying room for agricultural product drying processing.
The reference numbers in the figures illustrate: the heat pump system comprises a first heat dissipation system 1, a steam heating system 2, a heat storage hot water tank 3, a double-effect heat pump unit 4, a triple-effect heat pump unit 5, a cold storage cold water tank 6, a cold dissipation system 7 and a second heat dissipation system 8.
Detailed Description
The first aspect of this application discloses a heat pump steam combined's hot and cold water balanced system, refers to fig. 1, the system includes first cooling system, steam heating system, heat accumulation hot-water tank, double-effect heat pump set, triple-effect heat pump set, cold-storage cold-water storage cistern and cold system that looses, wherein:
first, this application's hot and cold water balanced system
1. First heat dissipation system 1
The first heat dissipation system 1 in this application comprises a first cooling tower, a first water pump and a first ball valve, see fig. 3, and its main function is to maintain the temperature of water in the heat storage hot water tank 3 at a set temperature or temperature range; the water outlet of the heat storage hot water tank 3 is connected with the water inlet of the first cooling water tower, the water outlet of the first cooling water tower is connected with the water inlet of the first water pump, and the water outlet of the first water pump is connected with the water inlet of the heat storage hot water tank 3 to form a hot water circulation loop; the three devices are connected through PCV water pipes, and the first ball valve is arranged on a pipeline between the heat storage hot water tank 3 and the first cooling water tower. The hot water in the loop is passed through the first cooling tower, and a certain amount of heat is removed by a fan in the first cooling tower, so that the temperature of the water in the heat storage hot water tank 3 is maintained.
2. Steam heating system 2
Referring to fig. 4, the steam heating system 2 includes a heat release system and a heat exchange circuit for separately producing hot water.
Wherein:
the heat release system comprises a steam inlet, a steam plate type heat exchanger, a cooling water tank, a vortex shedding flowmeter, a first stop valve, a second stop valve, a third stop valve, a drain valve and an electromagnetic valve, wherein the steam inlet is connected with a heat source inlet of the steam plate type heat exchanger through a pipeline, and a heat source outlet of the steam plate type heat exchanger is connected with the cooling water tank through a pipeline; the first stop valve, the electromagnetic valve, the second stop valve and the vortex shedding flowmeter are sequentially arranged on a pipeline between the steam inlet and the steam plate type heat exchanger, and the third stop valve and the drain valve are sequentially arranged on a pipeline between the steam plate type heat exchanger and the cooling water tank.
The heat exchange loop comprises a second water pump, a second ball valve, a third ball valve and a first water flow switch, a water outlet of the heat storage hot water tank 3 is connected with a cooling water inlet of the steam plate type heat exchanger through a pipeline, and a cooling water outlet of the steam plate type heat exchanger is connected with a water inlet of the heat storage hot water tank 3 through a pipeline, so that an independent hot water making loop is formed. Wherein the first water flow switch, the second ball valve, the second water pump and the third ball valve are sequentially arranged on a pipeline between the water outlet of the heat storage hot water tank 3 and the cooling water inlet of the steam plate type heat exchanger.
Water in the heat storage hot water tank 3 enters the steam plate heat exchanger from the water outlet, exchanges heat with steam entering the steam plate heat exchanger from the steam inlet, and then flows back to the heat storage hot water tank 3 to heat water in the heat storage hot water tank 3, and steam is condensed to form cooling water to enter the cooling water tank after heat exchange.
3. Double-effect heat pump unit 4
The double-effect heat pump unit 4 comprises a plurality of cold and hot water subsystems, and each cold and hot water subsystem is used for preparing cold water and hot water respectively. Each cold and hot water subsystem comprises a compressor, a condenser, an evaporator, an expansion valve, a gas-liquid separator, a liquid storage device and the like, all the components are connected through copper pipes, a refrigerant flows in the copper pipes, the refrigerant absorbs heat at the evaporator, and releases heat at the condenser. The compressor is used for compressing low-temperature refrigerant into high-temperature refrigerant, the high-temperature refrigerant is throttled into a low-temperature low-pressure gas-liquid two-phase state after flowing through the expansion valve, and then external heat is absorbed in the evaporator to form the low-temperature low-pressure refrigerant which is sucked into the compressor. A gas-liquid separator is mounted at the compressor inlet and an accumulator is mounted at the condenser outlet and functions to store refrigerant and filter and absorb water vapor from the refrigerant.
The cold and hot water subsystems are independent when producing cold and hot water, and the replaced cold and hot water are respectively collected through pipelines and then connected with the heat storage hot water tank 3 and the cold storage cold water tank 6.
Wherein, a refrigeration loop is formed between the evaporators of the subsystems and the cold storage cold water tank 6 through cold water pipes, and a heating loop is formed between the condensers of the subsystems and the heat storage hot water tank 3 through hot water pipe connection, so the double-effect heat pump unit 4 can simultaneously prepare cold water and hot water. And a third water pump, a third ball valve and a second water flow switch are sequentially arranged on the cold water pipe and the hot water pipe.
4. Three-effect heat pump unit 5
The structure of the triple-effect heat pump unit 5 is basically the same as that of the double-effect heat pump unit 4, and the difference is that on the basis of the double-effect heat pump unit 4, a condenser is additionally arranged in each cold and hot water subsystem of the triple-effect heat pump unit 5, and a second heat dissipation system 8 is arranged on the triple-effect heat pump unit 5.
The working principle of the triple-effect heat pump unit 5 is the same as that of the double-effect heat pump unit 4, and the triple-effect heat pump unit is respectively connected with the cold accumulation cold water tank 6 and the heat accumulation hot water tank 3 to form a refrigeration loop and a heating loop and can simultaneously produce cold water and hot water.
In addition, the triple-effect heat pump unit 5 can be connected with the second heat dissipation system 8, so that cold water can be independently prepared to supplement cold energy required by the balance system. When the cold water of the system is insufficient, the third-effect heat pump unit 5 is started and the second cooling system 8 is started at the same time, the prepared cold water enters the cold storage cold water tank 6, the prepared hot water enters the second cooling system 8, and redundant heat is dissipated by the second cooling system 8, so that the whole system can realize the function of independently preparing the cold water through the third-effect heat pump unit 5;
the second heat dissipation system 8 comprises a second cooling water tower connected with a condenser in the cold and hot water subsystem, and a fourth water pump, a fourth ball valve and a third water flow switch are sequentially arranged on a pipeline between the condenser and the second cooling water tower.
5. Cooling system 7
The cold dissipation system 7 is used for balancing the cold quantity of the cold accumulation cold water tank 6, so that the temperature of the water in the cold accumulation cold water tank 6 is maintained at a set temperature or a set temperature range. The cold dispersing system 7 comprises a third cooling water tower connected with the cold accumulation cold water tank 6, a fifth water pump and a fifth ball valve are sequentially arranged on a pipeline between the third cooling water tower and the cold accumulation cold water tank, and redundant cold energy flows into the third cooling water tower through the pipeline to be dispersed.
Referring to fig. 2, when the cold and hot water equalizing system of the present application is applied to a production workshop agricultural product drying room, the cold and hot water equalizing system is installed on a roof of the production workshop, and the drying room is located on a floor of the production workshop below the roof. The cold and hot water prepared by the cold and hot water equalizing system is mainly used for processing and drying industrial products.
The drying room needs heat and cold when removing water in fresh agricultural products, wherein the heat is provided by a heat storage hot water tank 3 of the system, the heat storage hot water tank 3 is connected with a heater of the drying room through a pipeline, hot water exchanges heat with air through the heater in the drying room to heat an air medium in the drying room, the air medium is conveyed in the drying room through a fan to circulate, advection passes through a material area to exchange heat with high-humidity fresh agricultural products in a convection mode, the air medium is changed into a high-humidity air medium and then flows back to pass through a dehumidifier, the dehumidifier is connected with a cold storage cold water tank 6 of the system through a pipeline, the high-humidity air medium meets a cold pipe of the dehumidifier, liquefaction and dehumidification are changed into a low-temperature low-humidity air medium, the low-temperature low-humidity air medium passes through the heater, the high-temperature air medium is heated when humidity is heated.
In fact, the heat pump and steam combined cold and hot water equalizing system can supply cold and heat required by drying rooms of a plurality of production workshops. The required cold volume of agricultural product stoving process and heat are not invariable, and heat pump stoving is an energy-conserving, efficient green stoving mode, but is considering the prerequisite of economic nature, and heat pump drying equipment can not match big enough, and consequently will appear in earlier stage rapid heating up ability weak, and the long-time shut down will appear in the low humidity of later stage agricultural product, and the utilization ratio is not high.
Second, application of the present application
According to a second aspect of the present application, on the basis of a heat pump and steam combined cold and hot water equalizing system, a set of control methods for applying the system to a drying room is provided, and refer to fig. 5.
When using the system of this application at the baking house of agricultural product drying, the balanced system of hot and cold water provides the hot and cold water in to the baking house to carry out feedback control through detecting cold and hot temperature, the hot and cold water transport between baking house and cold-storage cold water storage cistern 6, heat accumulation hot-water tank 3 is by circulating water pump and water solenoid valve control. Each set of the system can be supplied to n drying rooms, each set of the system comprises m double-effect heat pump units 4, P triple-effect heat pump units 5 and T steam heating systems 2 so as to meet the cold and heat requirements of different agricultural product working conditions, and the size of the system is related to the number of the drying rooms.
For example: baking the cantonese sausage, wherein if 5-6t of baked wet sausage is baked, about 80 times of hot and cold water units of a heat pump are needed; therefore, the wet sausage of 45t is treated in the construction day, 8 sets of equivalent units and 16 units are required, 640 pieces of wet sausage are counted, the occupied area is large, the total installed capacity is large, a large amount of cold energy can be dissipated in the early stage, and the utilization rate of the units in the later stage is low. If the hot and cold water equalizing system that the heat pump steam of this application is united, will reduce one set of unit, double-effect heat pump set 4m is 9, about 432 matches, triple-effect heat pump set 5P is 3, about 144 matches, steam heating system 2T is 1, 576 matches in total, effectively reduces total installed capacity and area, and concentrate the allotment can the significantly reduced cold volume, thermal loss.
The hot and cold water equalizing system with the heat pump and the steam combined is controlled by an independent control system, tmin sets the temperatures of the cold storage cold water tank 6 and the heat storage hot water tank 3 before the drying and processing operation of agricultural products, and the system is started to prepare hot and cold water. Preferentially starting the double-effect heat pump unit 4 and the triple-effect heat pump unit 5 to prepare cold water and hot water, continuously detecting the temperature of the cold water and the hot water by the control system, comparing the difference between the real-time temperature of the cold water and the hot water and a set value, and gradually closing the starting number of the double-effect heat pump unit 4 and the triple-effect heat pump unit 5 along with the reduction of the difference value.
If the cold water temperature is detected to be fast in reduction rate and the hot water temperature is detected to be slow in increase rate (for example, the difference between the current cold water temperature and the target cold water temperature is less than 2 ℃, but the difference between the current hot water temperature and the target hot water temperature is more than 2 ℃), the three-effect heat pump unit 5 is preferentially closed, and when the cold water temperature reaches a set value and the hot water temperature does not reach the set value, the steam heating system 2 is started to independently prepare hot water; if the rising rate of the hot water temperature is detected to be high and the distance between the cold water temperature and the set temperature value is large (for example, the difference between the current hot water temperature and the target hot water temperature is less than 2 ℃, and the difference between the current cold water temperature and the target cold water temperature is greater than 2 ℃), the starting number of the double-effect heat pump units 4 is gradually reduced, and when the hot water temperature reaches the set temperature value, the single water refrigerating function of the triple-effect heat pump unit 5 is started.
The number of the on-off double-effect heat pump units 4, the number of the three-effect heat pump units 5 and the steam heating system 2 are mainly determined by setting a plurality of hot water temperature deviation values.
Taking the system comprising 3 double-effect heat pump units 4, 1 triple-effect heat pump unit 5 and 1 steam heating system 2 as an example, when the actually measured hot water temperature and the target temperature reach different temperature values A11, A12, A13, A2 and A3, the system respectively represents that the corresponding number of double-effect heat pump units 4 (3), triple-effect heat pump units 5 (1) and steam heating systems 2 (1) are started or closed.
The method comprises the steps that a cold and hot water temperature detection signal of a heat pump and steam combined cold and hot water balance system is associated with a drying room control system, when the water temperatures of a cold storage cold water tank 6 and a heat storage hot water tank 3 are set to reach a set value, the drying room is gradually opened to dry agricultural products, when the hot water temperature of the heat storage hot water tank 3 of the balance system is lower than a certain hot water early warning temperature and the cold water temperature of the cold storage cold water tank 6 of the balance system is higher than a certain cold water early warning temperature value and is always increased, the drying room automatically gives an alarm, the cold and heat required by the increase of the opening number of the drying room are gradually increased, more double-effect heat pump units 4 and three-effect heat pump units 5 are opened by the refrigeration and hot water balance system, and a steam.
Referring to the drawings, in an embodiment of the present application, when a hot and cold water equalization system combining heat pump and steam is applied to a drying room, m is 3, P is 1, and T is 1 in a steam heating system 2, the double-effect heat pump units 4 in the system are set, and the control method of the system includes the following steps:
detecting hot water temperature T in heat storage hot water tankhWhether the temperature is lower than the preset hot water early warning temperature and the cold water temperature T in the cold storage cold water tankcWhether the temperature is higher than the preset cold water early warning temperature and is always increased, if so, alarming is carried out;
when the hot water temperature is equal to the target temperature Th0Difference Δ T betweenhWhen the temperature is greater than the set temperature threshold value Qaa, and the temperature of the cold water is equal to the target temperature Tc0Difference Δ T betweencWhen Q < a, executing step 4-1;
when the hot water temperature is equal to the target temperature Th0Difference Δ T betweenhWhen the temperature is less than the set temperature threshold value Qaa, and the temperature of the cold water is equal to the target temperature Tc0Difference Δ T betweencIf the value is more than Q a, executing the step 4-2;
wherein Q is m + P;
step 4-1, closing the P triple-effect heat pump units, starting a steam heating system, taking the temperature of a ℃ as a step, and gradually closing the double-effect heat pump units and the steam heating system in the process that the hot water temperature and the cold water temperature reach the corresponding target temperatures;
step 4-2, a second heat dissipation system of the triple-effect heat pump unit is started, the triple-effect heat pump unit is converted into a single refrigeration mode, the temperature a ℃ is taken as a step, and the double-effect heat pump unit and the triple-effect heat pump unit are gradually closed in the process that the hot water temperature and the cold water temperature reach the corresponding target temperatures;
for example, in the present embodiment, m is 3, P is 1, and Q is 4. Then ath> 4a and Δ TcIf < 4a, the strategy of step 4-1 is executed, i.e. the adjustment is carried out by taking a ℃ as a step, if delta T is carried out after a period of timeh> 3a and Δ TcIf < 3a, 1 double-effect unit is closed firstly, delta Th> 2a and Δ TcWhen the frequency is less than 2a, closing a double-effect unit, and delta ThA and Δ TcWhen a is less than a, the last double-effect unit is closed until delta Th、ΔTcWhen both are 0, the steam heating system is turned off, and both the cold water and the hot water reach the target temperature.
The strategy of step 4-2 is the same and will not be described again.
And 5, when the hot water temperature and the cold water temperature reach the corresponding target temperatures, opening cold and hot water pipelines between the balance system and the drying room, so that cold water and hot water are respectively supplied to a heater and a dehumidifier of the drying room, and the drying room is heated and dehumidified by using the supplied cold and hot water until the moisture of the agricultural products is dried to meet the requirements.
Effects of the present application
The cold and hot water equalizing system is mainly used in the field of agricultural product drying processing, such as dehydration drying of meat products, aquatic products, fruits and vegetables. Usually, the heat quantity and the cold quantity required in the drying and processing process of the agricultural products are unbalanced, so that the waste of the heat quantity and the cold quantity can be caused to a certain degree no matter the traditional single heat source is adopted for heating and dehumidifying, and the heat pump is adopted for dehumidifying and drying and dehumidifying. The steam heating system is a single heating heat source, the double-effect heat pump unit can produce cold and heat, the triple-effect heat pump unit can produce cold and heat or separately produce cold, the three systems are integrated to produce cold and hot water, and the cold and hot water are stored in the cold storage cold water tank and the heat storage hot water tank respectively to construct a cold and hot water balance system. The cold and heat quantity is supplied to the drying rooms through the cold and hot water balance system, and the cold quantity and the heat quantity of the balance system are far greater than the requirements of the drying rooms, so that one system can generally supply the cold and heat quantities of a plurality of drying rooms.
The cold and hot water balance system and the heat pump dehumidification dryer both apply the heat pump system to prepare cold and hot water, heat is used for heating materials to evaporate moisture, and cold is used for dehumidification, but compared with the heat pump dehumidification dryer, the prepared cold and hot water is related to condensation temperature and evaporation temperature, namely the COP value of the heat pump system can change along with the change of temperature required in the drying process of agricultural products, the heat pump host system of the cold and hot water balance system prepares cold and hot water and supplies cold and hot water into the drying room to form two independent systems, namely the working condition parameters of the heat pump system for preparing cold and hot water are basically constant, so that the COP value of the heat pump system is improved to the maximum extent, and the loss of refrigeration parts such as a compressor and the like caused by frequent switching of the heat.
The cold and hot water balancing system is applied to agricultural product drying processing, and compared with a single heat pump dehumidification dryer, the cold and hot water balancing system can better recycle cold and hot water. The temperature of the materials needs to be increased by more heat in the early stage of drying and processing of agricultural products, so that the cold quantity is excessive in the stage, and the excessive cold quantity has to be dissipated by adopting a single heat pump dehumidification dryer; along with the temperature of agricultural product material itself is promoted gradually, the humidity of circulating air medium in the drying room increases, and the cold volume of demand increases gradually, and the cold volume that the heat pump dehumidification desiccator produced at this stage is not enough, and agricultural product material is spoiled easily under the high temperature and high humidity, adopts the mode of supplementary hydrofuge frequently to ensure the stoving quality of agricultural product material. The cold and hot water balance system can store the excess cold in the early stage, and the cold is supplemented in the high-temperature high-humidity dehumidification stage of the agricultural products, so that the recycling of the cold and hot quantities is realized.
The cold and hot water equalizing system is applied to agricultural product processing enterprises, so that one can drag more cold, redundant cold energy can be applied to workshop cooling, and the waste heat water can be used as domestic water through purification, for example, some meat product processing enterprises apply the waste heat water to frozen meat thawing and the like. In addition, the refrigerating and heating system is independent of the drying room, so that the refrigerating and heating host system can be completely used for a cooling and heating air conditioner, a fresh-keeping warehouse and the like in the off-season of agricultural product drying, and the utilization efficiency of the refrigerating and heating host system is higher than that of a heat pump dehumidification dryer system.
The heat pump system is used for preparing cold water and hot water, the heating coefficient of the heat pump system can reach 3-4, namely 3-4 parts of heat can be prepared by consuming 1 part of electric energy, and 2-3 parts of cold can be prepared at the same time. If 4 parts of heat are needed in the early stage of drying certain agricultural products and 3 parts of cold are needed, the requirement can be met by directly adopting a heat pump dehumidification dryer; in fact, many produce are dry and require more heat at the early stage and less cold, e.g., 4 parts hot and 1 part cold. After the temperature of the material rises, the cold requirement in the dehumidification stage is increased, if 4 parts of hot cold are needed for 3 parts of cold, the heat pump dehumidification dryer cannot meet the requirement, and the cold and hot water balance control system can supply 2 parts of stored cold and hot water in the previous stage to the dehumidification stage to meet the cold and hot amount balance requirement of agricultural product drying operation. Therefore, the cold-hot water balancing system is applied to drying of large and medium-sized (more than 25t wet sausage in daily treatment) preserved meat products, a set of heat pump and steam combined cold-hot water balancing system is configured to supply cold and heat for a plurality of drying rooms, only a heat exchanger and a circulating fan are needed to be configured in an agricultural product drying room, and compared with the mode that a heat pump dehumidification dryer is directly applied to one drying room and one heat pump dehumidification system is configured, the equipment investment cost is saved by about 20% and the power consumption is saved by about 15% when the same preserved meat product is treated daily on average.
Claims (6)
1. The utility model provides a hot and cold water balanced system of heat pump steam combination which characterized in that, includes first cooling system (1), steam heating system (2), heat accumulation hot-water tank (3), double-effect heat pump set (4), three-effect heat pump set (5), cold-storage cold-water tank (6) and cold system (7) that looses, wherein:
the first heat dissipation system (1) is connected with the heat storage hot water tank (3) and is used for circularly dissipating redundant heat from hot water in the heat storage hot water tank (3) so as to maintain the temperature of the water in the heat storage hot water tank (3);
the steam heating system (2) is connected with the heat storage hot water tank (3), the steam heating system (2) comprises a heat release system and a heat exchange loop, wherein the heat release system is used for providing heat of steam to the heat storage hot water tank (3) through the heat exchange loop in a heat exchange mode so as to provide hot water to the heat storage hot water tank (3);
the double-effect heat pump unit (4) and the triple-effect heat pump unit (5) respectively form a heating loop and a refrigerating loop with the heat storage hot water tank (3) and the cold storage cold water tank (6) and are used for simultaneously providing prepared cold water and hot water for the heat storage hot water tank (3) and the cold storage cold water tank (6); the three-effect heat pump unit (5) is connected with a second heat dissipation system (8), and the three-effect heat pump unit (5) can independently prepare cold water through the second heat dissipation system (8);
the cold dissipation system (7) is connected to the cold accumulation cold water tank (6) and used for balancing the cold of the cold accumulation cold water tank (6) and dissipating redundant cold of the cold accumulation cold water tank (6) in a circulating mode.
2. The heat pump combined heat and cold water equalizing system according to claim 1, wherein the first heat dissipating system (1) comprises a first cooling tower, a first water pump and a first ball valve, wherein the water outlet of the hot-water storage tank (3) is connected to the water inlet of the first cooling tower, the water outlet of the first cooling tower is connected to the water inlet of the first water pump, the water outlet of the first water pump is connected to the water inlet of the hot-water storage tank (3) to form a hot water circulation loop, and the first ball valve is disposed on the pipeline between the hot-water storage tank (3) and the first cooling tower.
3. The heat pump and steam combined cold and hot water equalizing system as claimed in claim 1, wherein the heat release loop of the steam heating system (2) comprises a steam inlet, a steam plate heat exchanger, a cooling water tank, a vortex flowmeter, a first stop valve, a second stop valve, a third stop valve, a drain valve and an electromagnetic valve, wherein the steam inlet is connected with a heat source inlet of the steam plate heat exchanger through a pipeline, and a heat source outlet of the steam plate heat exchanger is connected with the cooling water tank through a pipeline; the first stop valve, the electromagnetic valve, the second stop valve and the vortex shedding flowmeter are sequentially arranged on a pipeline between the steam inlet and the steam plate type heat exchanger, and the third stop valve and the drain valve are sequentially arranged on a pipeline between the steam plate type heat exchanger and the cooling water tank.
4. The heat pump steam combined cold and hot water equalizing system according to claim 3, characterized in that the heat exchange loop of the steam heating system (2) comprises a second water pump, a second ball valve, a third ball valve and a first water flow switch, the water outlet of the heat storage hot water tank (3) is connected with the cooling water inlet of the steam plate heat exchanger through a pipeline, and the cooling water outlet of the steam plate heat exchanger is connected with the water inlet of the heat storage hot water tank (3) through a pipeline, so that a single manufactured hot water loop is formed; the first water flow switch, the second ball valve, the second water pump and the third ball valve are sequentially arranged on a pipeline between the water outlet of the heat storage hot water tank (3) and the cooling water inlet of the steam plate type heat exchanger.
5. The heat pump and steam combined cold and hot water equalizing system according to claim 1, wherein the double-effect heat pump unit (4) comprises a plurality of cold and hot water subsystems, each cold and hot water subsystem is used for producing cold water and hot water, each cold and hot water subsystem comprises a compressor, a condenser, an evaporator, an expansion valve, a gas-liquid separator and a liquid storage device, all the components are connected through copper pipes, a refrigerant flows in the copper pipes, the refrigerant absorbs heat at the evaporator and releases heat at the condenser;
a refrigeration loop is formed between the evaporators of the subsystems and the cold storage cold water tank (6) through cold water pipes, and a heating loop is formed between the condensers of the subsystems and the heat storage hot water tank (3) through hot water pipes.
6. The heat pump and steam combined cold and hot water equalizing system according to claim 1, wherein the triple-effect heat pump unit (5) is based on the double-effect heat pump unit (4), a condenser is additionally arranged in each cold and hot water subsystem, and the second heat dissipation system (8) is arranged on the triple-effect heat pump unit (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020063758.0U CN211782326U (en) | 2020-01-13 | 2020-01-13 | Heat pump and steam combined cold and hot water balancing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020063758.0U CN211782326U (en) | 2020-01-13 | 2020-01-13 | Heat pump and steam combined cold and hot water balancing system |
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| Publication Number | Publication Date |
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| CN211782326U true CN211782326U (en) | 2020-10-27 |
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| CN202020063758.0U Active CN211782326U (en) | 2020-01-13 | 2020-01-13 | Heat pump and steam combined cold and hot water balancing system |
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| Country | Link |
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| CN (1) | CN211782326U (en) |
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