CN108592515B - Control method of refrigeration house refrigeration system - Google Patents

Control method of refrigeration house refrigeration system Download PDF

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Publication number
CN108592515B
CN108592515B CN201810560486.2A CN201810560486A CN108592515B CN 108592515 B CN108592515 B CN 108592515B CN 201810560486 A CN201810560486 A CN 201810560486A CN 108592515 B CN108592515 B CN 108592515B
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refrigeration
temperature
cold
storage
water tank
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CN108592515A (en
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魏良
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Beijing Zhongleng High Tech Refrigeration Equipment Co ltd
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Beijing Zhongleng High Tech Refrigeration Equipment Co ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00Arrangement or mounting of control or safety devices
    • F25D29/001Arrangement or mounting of control or safety devices for cryogenic fluid systems

Abstract

The invention discloses a control method of a refrigeration house refrigeration system, which comprises the following steps: starting a second refrigeration cycle system to operate in the valley period of the electricity priceThe first time is carried out, then the second refrigeration cycle system is closed, the main refrigeration unit is started to operate for the second time by the non-full-load input power, then the main refrigeration unit is fully operated, and simultaneously the second refrigeration cycle system is started to reduce the temperature of the middle refrigerant in the cold storage water tank to the first preset temperature T0When the inter-cooling liquid in the cold storage water tank reaches a first preset temperature T0When the main refrigerating unit is started, the main refrigerating unit is closed; when the storage temperature reaches the set storage temperature T, closing the second refrigeration cycle system; and then, monitoring the temperature of the storage, and opening a second refrigeration cycle to reduce the temperature of the storage to the set temperature T when the temperature of the storage is higher than the upper limit T' of the temperature of the storage.

Description

Control method of refrigeration house refrigeration system
Technical Field
The invention relates to the technical field of low-temperature refrigeration, in particular to a control method of a refrigeration house refrigeration system.
Background
At present, food safety and cold chain construction enter a high-speed development period, and a refrigeration house is used as a central link of low-temperature circulation of food and is very important for all links of the whole cold chain. In the prior art of large-scale cold storages, liquid ammonia and freon are mainly used as refrigerants for refrigeration.
The liquid ammonia refrigerating system generally comprises a refrigerating unit, an ammonia-oil separator, a high-pressure liquid storage device, a condenser, a low-pressure circulating liquid storage barrel, an oil collector, an ammonia pump, an air cooler and the like, although the liquid ammonia refrigerating efficiency is higher, and the operation cost is lower, the system is complex in pipeline, high in operation management difficulty and high in requirement on the professional level of an operator, and meanwhile, due to the fact that automation is difficult to achieve, the system needs 24-hour on-duty operation management of the operator. And the problems of difficult oil return and easy leakage of liquid ammonia in a direct evaporation system exist, and once the ammonia gas is leaked, explosion accidents are easy to occur.
The input cost of the Freon refrigeration system is high in the initial construction stage, the Freon refrigeration system is also used as a direct evaporation system, mixed lubricating oil is needed, and when the vertical height or the total length of a connecting copper pipe of an outdoor unit of the refrigeration system is increased, serious oil return unsmooth of the refrigeration system can be caused, so that the refrigeration efficiency is greatly reduced, and the power consumption is greatly increased. Furthermore, since freon refrigerant has no significant characteristics in the case of leakage, the operational cost is significantly increased in the case of leakage repair and filling of refrigerant.
Therefore, a refrigeration house refrigeration system which can realize safe operation, has higher refrigeration efficiency and greatly reduces the operation cost and an automatic control method of the refrigeration system are urgently needed in the field.
Disclosure of Invention
One of the technical problems to be solved by the invention is to provide a control method of a refrigeration house refrigeration system capable of reducing the energy consumption of the refrigeration house refrigeration system
In order to solve the technical problem, the invention provides a method for controlling a refrigeration house refrigeration system, wherein the refrigeration house refrigeration system comprises a first refrigeration cycle system and a second refrigeration cycle system, the first refrigeration cycle system comprises a main refrigeration unit, the second refrigeration cycle system comprises a cold storage water pool, a refrigeration pump and a refrigeration house heat exchanger, and the control method comprises the following steps:
starting a second refrigeration circulating system at the electricity price valley time period, conveying the inter-cooling liquid in the cold storage water tank to the heat exchanger between the cold storages by using the freezing pump, returning the inter-cooling liquid to the cold storage water tank after passing through the heat exchanger between the cold storages, and maintaining the first time period t in the whole process1
The main refrigerating unit is enabled to run in the state of maximum output power, the first refrigerating circulation system is utilized to refrigerate the inter-cooling liquid in the cold storage water tank, and the whole process is maintained for the second time period t2
The main refrigerating unit is operated in a non-maximum output power state, and the temperature of the middle refrigerant in the cold storage water tank is reduced to a first preset temperature T0The cold-storage water tank is communicated with the cold-storage room heat exchanger through a cold pump; when the inter-cooling liquid in the cold accumulation water tank reaches a first preset temperature T0When the main refrigerating unit is started, the main refrigerating unit is closed; the whole process is maintained for a third time period t3
When the storage temperature reaches the set storage temperature T, closing the second refrigeration cycle system; and then, monitoring the temperature of the storage, and opening a second refrigeration cycle to reduce the temperature of the storage to the set temperature T when the temperature of the storage is higher than the upper limit T' of the temperature of the storage.
In one embodiment, when the temperature of the cold liquid in the cold storage water tank rises to the second predetermined temperature T1When the temperature of the cold liquid in the cold storage water tank is cooled to the first preset temperature T, the first refrigeration cycle is started to refrigerate the cold liquid to the first preset temperature T0
In one embodiment, the first predetermined temperature T0The setting of the cold storage tank meets the requirement that the main refrigerating unit does not need to be started to refrigerate the inter-cooling liquid in the cold storage water tank before the next electricity price valley time period comes.
In one embodiment, the first time period t1A second time period t2And a third duration t3The sum is less than the duration of the electricity price valley period。
The invention also provides a control method of the refrigeration house refrigeration system, the refrigeration house refrigeration system comprises a first refrigeration cycle system and a second refrigeration cycle system, the first refrigeration cycle system comprises a main refrigeration unit, the second refrigeration cycle system comprises a cold accumulation water pool, a refrigeration pump and a heat exchanger between the refrigeration houses, and the control method comprises the following steps:
starting a second refrigeration circulating system at the electricity price valley time period, conveying the inter-cooling liquid in the cold storage water tank to the heat exchanger between the cold storages by using the freezing pump, returning the inter-cooling liquid to the cold storage water tank after passing through the heat exchanger between the cold storages, and maintaining the first time period t in the whole process1
The main refrigerating unit is enabled to run in the state of maximum output power, the first refrigerating circulation system is utilized to refrigerate the inter-cooling liquid in the cold storage water tank, and the whole process is maintained for the second time period t2
Operating the main refrigeration unit in a non-maximum output power state; according to the quantity of the second day refrigerator in and out and the environmental temperature, looking up a table from a data table to obtain a first preset temperature T0Then the first refrigeration cycle system is required to cool the temperature of the middle cooling liquid in the cold storage water tank to a first preset temperature T0(ii) a When the inter-cooling liquid in the cold accumulation water tank reaches a first preset temperature T0When the main refrigerating unit is closed, the whole process is maintained for a third time period t3
And when the storage temperature reaches the set storage temperature T, closing the second refrigeration cycle system. Then, the monitoring of the storage temperature is maintained, and when the storage temperature is higher than the upper limit T', the second refrigeration cycle system is started again to make the storage temperature return to the set storage temperature T.
Before the next electricity price valley time period comes, if the temperature of the middle cooling liquid in the cold storage water tank is greater than or equal to a second preset temperature T1Automatically cooling the refrigerating fluid in the first refrigerating cycle, and modifying the data table to output and input the second daily refrigerator and the first preset temperature T corresponding to the environment temperature0The temperature is reduced by 1 ℃, if the temperature of the middle coolant in the cold accumulation water tank is less than T1-1, modifying the data table to enable the second daily refrigerator to be in and out of the storage volume and the first preset temperature T corresponding to the environment temperature0Increase 1 deg.C, if storeThe temperature of the inter-coolant in the cold water pool is less than T1And is greater than T1-1, keeping a first preset temperature T corresponding to the warehouse-in and warehouse-out quantity and the environmental temperature of the second daily freezer in the data table0And is not changed.
In one embodiment, the second day freezer load and unload data is obtained from a freezer cargo management system.
In one embodiment, the second day ambient temperature is obtained from a weather forecast data server.
< first refrigeration cycle and second refrigeration cycle >
The first refrigeration cycle system of the present invention includes a main refrigeration unit, a main refrigeration unit heat exchanger, and an evaporative condenser. The first refrigeration cycle system is used for refrigerating the inter-cooling liquid in the cold storage water tank to enable the inter-cooling liquid to reach the expected temperature. The first refrigeration cycle system in the present invention may use a direct evaporation refrigeration system, for example, a refrigeration system using freon as a refrigerant, or a refrigeration system also using liquid ammonia as a refrigerant. The main refrigeration unit comprises a compressor and a throttle valve, and the compressor can use a semi-closed screw compressor or a semi-closed screw compressor.
The main refrigerating unit heat exchanger used in the first refrigerating cycle system can be a coil type heat exchanger, a plate type heat exchanger or a combination of the coil type heat exchanger and the plate type heat exchanger.
In the second refrigeration cycle system, cold accumulation water pools, adjusting stations, heat exchangers between the cold storages and pipelines connected with the heat exchangers are all potassium formate-pentaerythritol-water dispersible polyisocyanate-water system medium-cooling liquid. The middle cooling liquid comprises, by mass, 30-45% of potassium formate, 15-27% of pentaerythritol, 10-18% of water dispersible polyisocyanate, 0-3% of propylene glycol, 0-2% of sodium dehydroacetate, 0-2% of potassium sorbate and 15-25% of distilled water. The density of the intercooling liquid is 1.04-1.36 g/cm3The specific heat is 0.56-0.746 cal/g DEG C, the viscosity is 2.9-15.9 mPa & s (cp), the thermal conductivity is 0.21-0.47W/m.K, the boiling point is more than 150 ℃, the freezing point is less than-60 ℃, and no flash point exists. The medium-cooling liquid does not need to be mixed with lubricating oil for use, so that the problem of difficult oil return is avoidedThe energy consumption of the refrigeration system increases.
According to the volume of the required refrigeration cold storage, the volume is 49500m3For example, the volume of the cold storage water pool in the second refrigeration cycle system should be not less than 60m3. The cold accumulation pond is 0.5mm carbon steel board in its inlayer, and the inlayer is 300mm polyurethane heat preservation.
The adjusting station of the second refrigeration cycle is provided with a liquid outlet valve adjuster and a liquid inlet valve adjuster, and the liquid outlet valve adjuster and the liquid inlet valve adjuster of each refrigeration house are provided with a corresponding group of valve groups.
< control method for achieving minimum energy consumption of refrigeration System >
The cold storage water tank of the refrigeration system of the refrigeration house is stored with a large amount of low-temperature secondary refrigerant, so that the cold storage capacity of the refrigeration system is greatly improved. And simultaneously, the input power of the main refrigerating unit occupies a large proportion of the whole system. Therefore, in order to reduce the energy consumption of the refrigeration system, the start-up time of the main refrigeration unit must be reduced as much as possible. On the other hand, the use of the industrial electricity prices is classified into three types, i.e., peak electricity prices, normal electricity prices, and valley electricity prices. Generally, the valley electricity price is 10 pm to 6 pm the next day, and the lowest electricity cost can be achieved by starting the main refrigeration unit in this period.
Based on the precondition, the control method for realizing the lowest energy consumption of the refrigeration system has the advantages that the main refrigeration unit is ensured to be started only in the time period of the electricity price valley, and the starting time is required to be shortened as much as possible; meanwhile, after the main refrigerating unit is closed, the refrigerating room temperature can be maintained within the set refrigerating room temperature range by only using the secondary refrigerant in the cold storage water tank for circulation before the next electricity price valley time period comes.
As shown in fig. 1, the structure diagram of the refrigeration system of the present invention, before the refrigeration system of the freezer is not optimized, the working process of the refrigeration system of the freezer is as follows: starting the main refrigerating unit 1 at the electricity price valley period, refrigerating the inter-coolant in the cold storage water tank 5 by using a first refrigerating cycle system, wherein the first refrigerating cycle system needs to reduce the inter-coolant temperature in the cold storage water tank 5 to a first preset temperature T0. At the same time, the regulating station 6 is turned offAnd closing the fifth interface and the sixth interface, opening the first interface, the second interface, the third interface and the fourth interface, conveying the inter-cooling liquid in the cold accumulation water tank 5 to the individual refrigeration house heat exchanger 8 through the liquid outlet valve regulator 61 by using the refrigeration pump 7, and returning the inter-cooling liquid to the cold accumulation water tank 5 through the liquid inlet valve regulator 62 after passing through the refrigeration house heat exchanger 8. When the inter-cooling liquid in the cold storage water tank 5 reaches the first preset temperature T0At this time, the main refrigerator group 1 is turned off. When the storage temperature reaches the set storage temperature T, the first interface 601, the second interface 602, the third interface 603, and the fourth interface 604 of the conditioning station 6 are turned off. And then, monitoring the temperature of the cold storage, and when the temperature of the cold storage is higher than the upper limit T' of the temperature of the cold storage, opening the first interface 601, the second interface 602, the third interface 603 and the fourth interface 604, starting the refrigeration pump 7, and conveying the low-temperature inter-cooling liquid in the cold storage water tank 5 to the individual cold storage room heat exchanger 8 through the liquid outlet valve regulator 61. When the storage temperature reaches the set storage temperature T again, the first interface 601, the second interface 602, the third interface 603, the fourth interface 604, and the refrigerating pump 7 of the conditioning station 6 are turned off again. When the temperature of the middle coolant in the cold storage water tank 5 is higher than the second preset temperature T1When the cold storage water tank 5 is cooled to the first preset temperature T, the main refrigerating unit 1 is started again0. The inter-cooling liquid in the cold storage water tank 5 is not higher than the second predetermined temperature T as the whole electricity price peak period1When the next electricity price valley time period comes, the first refrigeration cycle is actively started to lower the inter-cooling liquid in the cold storage water tank 5 to the first preset temperature T0
In the refrigeration control process of the refrigeration house, the cold accumulation function of the intercooling liquid in the cold accumulation water tank is not fully utilized, and the cold quantity contained in the intercooling liquid is not fully released. Therefore, the work flow of the refrigeration system of the refrigeration house can be improved as follows:
1. firstly, in the electricity price valley period, a second refrigeration cycle system is started, the refrigerating pump 7 is utilized to convey the inter-cooling liquid in the cold storage water tank 5 to the inter-refrigeration house heat exchanger 8, the inter-cooling liquid returns to the cold storage water tank 5 after passing through the inter-refrigeration house heat exchanger 8, and the whole process maintains the first time period t1. When the second refrigeration cycle system is started at the stage, only part of the refrigeration pumps in the second refrigeration system can be started.
2. Starting the second refrigerationAll the refrigeration pumps in the circulating system enable the main refrigerating unit 1 to operate in a state of maximum output power. Refrigerating the inter-cooling liquid in the cold storage water tank 5 by using the first refrigeration cycle system, and maintaining the whole process for the second time period t2
3. Only part of the compressors in the main refrigerating unit 1 are started, so that the main refrigerating unit 1 operates in a non-maximum output power state, and meanwhile, part of the freezing pumps in the second refrigerating cycle system are started. Refrigerating the inter-coolant in the cold storage water tank 5 by using a first refrigeration cycle system, wherein the first refrigeration cycle system is required to reduce the temperature of the inter-coolant in the cold storage water tank 5 to a first preset temperature T0. And the cold-cooling liquid in the cold-storage water tank 5 is conveyed to the cold-storage room heat exchanger 8 by using the freezing pump 7, and the cold-cooling liquid returns to the cold-storage water tank 5 after passing through the cold-storage room heat exchanger 8. When the inter-cooling liquid in the cold storage water tank 5 reaches the first preset temperature T0Then the main refrigerating unit 1 is closed, and the whole process is maintained for a third time period t3
4. And when the storage temperature reaches the set storage temperature T, closing the second refrigeration cycle system. And then, monitoring the temperature of the cold storage, and when the temperature of the cold storage is higher than the upper limit T' of the temperature of the cold storage, opening the first interface 601, the second interface 602, the third interface 603 and the fourth interface 604, starting the refrigeration pump 7, and conveying the low-temperature inter-cooling liquid in the cold storage water tank 5 to the individual cold storage room heat exchanger 8 through the liquid outlet valve regulator 61. When the storage temperature reaches the set storage temperature T again, the first interface 601, the second interface 602, the third interface 603, the fourth interface 604, and the refrigerating pump 7 of the conditioning station 6 are turned off again.
5.t1+t2+t3And (3) the time length of the time period is less than the time length of the power price valley, and the step (1) is repeated again after the next power price valley time period comes.
In the above-mentioned refrigeration house refrigeration system, the refrigeration temperature of the inter-cooling liquid, i.e. the first predetermined temperature T0The method is preset by experience, and the set principle is that the cold storage liquid is fully refrigerated in one electricity price valley time period, the refrigeration requirement of the refrigeration house can be met only by starting the second refrigeration cycle system in the next electricity price peak value and flat time period, and the first refrigeration cycle does not need to be started again. But due to the external environment caused by seasonal changesThe change of the temperature and the difference of the quantity of the cold storage for getting in and out of the cold storage every day can cause the change of the quantity of the cold loss of the cold storage, so that the fixed first preset temperature T0It is necessary to set a large amount of redundancy, which causes a large loss of power consumption. Therefore, the invention also provides a method for setting the first preset temperature T by machine intelligent learning0The control method of the refrigeration house refrigeration system comprises the following steps:
1. firstly, in the electricity price valley period, a second refrigeration cycle system is started, the refrigerating pump 7 is utilized to convey the inter-cooling liquid in the cold storage water tank 5 to the inter-refrigeration house heat exchanger 8, the inter-cooling liquid returns to the cold storage water tank 5 after passing through the inter-refrigeration house heat exchanger 8, and the whole process maintains the first time period t1. When the second refrigeration cycle system is started at the stage, only part of the refrigeration pumps in the second refrigeration system can be started.
2. And starting all the refrigerating pumps in the second refrigerating circulation system to enable the main refrigerating unit 1 to operate in a maximum output power state. Refrigerating the inter-cooling liquid in the cold storage water tank 5 by using the first refrigeration cycle system, and maintaining the whole process for the second time period t2
3. Only a portion of the compressors in the main refrigeration unit 1 are started to operate the main refrigeration unit 1 in a non-maximum output power state. Meanwhile, a part of refrigerating pumps in the second refrigerating circulation system are started, the first refrigerating circulation system is utilized to refrigerate the inter-cooling liquid in the cold storage water tank 5, and the first preset temperature T is obtained by looking up a table from a data table according to the quantity of the second day refrigerator to be stored in and discharged and the ambient temperature0Then the first refrigeration cycle system is required to lower the temperature of the intermediate coolant in the cold storage water tank 5 to the first predetermined temperature T0. When the inter-cooling liquid in the cold storage water tank 5 reaches the first preset temperature T0Then the main refrigerating unit 1 is closed, and the whole process is maintained for a third time period t3
4. And when the storage temperature reaches the set storage temperature T, closing the second refrigeration cycle system. Then, the monitoring of the storage temperature is maintained, and when the storage temperature is higher than the upper limit T', the second refrigeration cycle system is started again to make the storage temperature return to the set storage temperature T.
5. Before the next electricity price valley period comes, if the temperature of the middle coolant in the cold storage water tank 5 is largeAt or equal to a second predetermined temperature T1Automatically starting the first refrigeration cycle to cool the refrigerating fluid, simultaneously modifying the data table, and outputting and inputting the second daily refrigerator to and from the storage volume and the first preset temperature T corresponding to the environment temperature0The temperature is reduced by 1 ℃, if the temperature of the middle cooling liquid in the cold accumulation water tank 5 is less than T1-1, modifying the data table to enable the second daily refrigerator to be in and out of the storage volume and the first preset temperature T corresponding to the environment temperature0The temperature is increased by 1 ℃, if the temperature of the middle cooling liquid in the cold accumulation water tank 5 is less than T1And is greater than T1-1, keeping a first preset temperature T corresponding to the warehouse-in and warehouse-out quantity and the environmental temperature of the second daily freezer in the data table0And is not changed.
Through the control process, the data table is continuously perfected through machine learning, and the obvious energy consumption reduction of the refrigeration system can be realized.
One or more embodiments of the present invention may have the following advantages over the prior art:
1. the invention effectively utilizes the cold quantity carried in the cold liquid by improving the refrigeration method of the refrigeration house, thereby reducing the energy consumption of the whole refrigeration system.
2. In the invention, a data table containing external environment temperature and warehouse-in and warehouse-out quantity factors is constructed by using a machine learning method, so that the inter-cooling liquid in the cold storage water tank is cooled to an optimal temperature value, the running time of a first refrigeration cycle is shortened, and the energy consumption of the whole refrigeration system is reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic system configuration of a refrigeration system according to the present invention;
FIG. 2 is a schematic diagram of a conditioning station configuration for a refrigeration system according to the present invention;
fig. 3 is a flowchart of a control method according to the first embodiment of the invention;
FIG. 4 is a flowchart of a control method according to a second embodiment of the invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a system architecture according to an embodiment of the present invention. The present embodiment will be described with reference to fig. 1.
The freezer refrigerating system of this embodiment includes first refrigerating cycle system and second refrigerating cycle system, first refrigerating cycle system includes main refrigerating unit 1, evaporative condenser 2 and main refrigerating unit heat exchanger 3, second refrigerating cycle system includes cold-storage pond 5, regulation station 6, freeze pump 7 and freezer room heat exchanger 8. In this embodiment, the main refrigerating unit 1 uses a semi-hermetic screw compressor, and has a capacity of 15000 tons and a volume of 50000m in a cold storage3When the temperature of the freezer is set to-22 ℃, 3 semi-closed screw compressors with single machine power of 165KW are needed to be used in parallel. The refrigerant used in the first refrigeration cycle system is R404A, the evaporative condenser is a forward flow evaporative condenser with 3 working conditions and the heat discharge quantity of 960KW, and the main refrigerating unit heat exchanger uses a coiled heat exchanger made of 16Mn steel pipes. The volume of the cold accumulation water tank 5 in the second refrigeration cycle system is 60m3The inner layer of the cold accumulation water tank 5 is a 0.5mm carbon steel plate, and the outer layer is a 300mm polyurethane heat-insulating layer. The freezing pump 7 adopts a centrifugal pump driven by a variable frequency motor with the power of 22 KW. The heat exchanger 8 between the cold storages can adopt a calandria heat exchanger and an air-cooled heat exchanger according to the physical parameters and the refrigeration parameter requirements of the cold storages. Fig. 2 is a schematic structural diagram of regulation station 6 in this embodiment, regulation station 6 includes liquid outlet valve regulator 61 and liquid inlet valve regulator 62 two parts, and to having the large-scale freezer between 8 freezers, liquid outlet valve regulator 61 and liquid inlet valve regulator 62 all are provided with 8 valves of group, and liquid outlet valve adjustsEach set of valves of the economizer 61 and the liquid inlet valve adjuster 62 corresponds to one refrigeration house. A plurality of interfaces are arranged in the adjusting station 6, wherein a first interface 601 is used for being connected with a liquid outlet of the freezing pump 7, a second interface 602 is used for being connected with a liquid inlet of the cold storage water pool, a third interface 603 is connected with an inlet of the heat exchanger between the cold storages, a fourth interface 604 is connected with an outlet of the heat exchanger between the cold storages, a fifth interface 605 is connected with an output port of the heat energy recoverer 4, and a sixth interface 606 is connected with an input port of the defrosting pump 9.
Example 1
As shown in fig. 3, the refrigeration system control method of the present embodiment is as follows:
1. at first, in the electricity price valley period, the second refrigeration cycle system is started, the refrigerating pump 7 is utilized to convey the inter-cooling liquid in the cold storage water tank 5 to the inter-refrigeration-house heat exchanger 8, the inter-cooling liquid returns to the cold storage water tank 5 after passing through the inter-refrigeration-house heat exchanger 8, and the whole process is maintained for 15-20 minutes. In this process, some of the freeze pumps 7, for example two of the three freeze pumps, may be turned on, or all three of the freeze pumps may be turned on.
2. All the compressors in the main refrigeration unit 1 are started. And refrigerating the inter-cooling liquid in the cold storage water tank 5 by using a first refrigeration cycle system, and maintaining the whole process for 120 minutes.
3. Only a portion of the compressors in the main refrigeration unit 1 are activated, for example, one of the three compressors is turned on. The first refrigeration cycle system is used for refrigerating the inter-cooling liquid in the cold accumulation water tank 5, and the first refrigeration cycle system is required to cool the inter-cooling liquid in the cold accumulation water tank 5 to-30 ℃. And the cold-cooling liquid in the cold-storage water tank 5 is conveyed to the cold-storage room heat exchanger 8 by using the freezing pump 7, and the cold-cooling liquid returns to the cold-storage water tank 5 after passing through the cold-storage room heat exchanger 8. When the inter-cooling liquid in the cold storage water tank 5 reaches-30 ℃, the main refrigerating unit 1 is closed, and the whole process is maintained for 20 minutes.
4. When the temperature of the storage reaches-22 ℃, the second refrigeration cycle system is closed. And then, monitoring the temperature of the cold storage, and when the temperature of the cold storage is higher than-16 ℃, opening the first interface 601, the second interface 602, the third interface 603 and the fourth interface 604, starting the refrigerating pump 7, and conveying the low-temperature inter-cooling liquid in the cold storage water tank 5 to the individual cold storage room heat exchanger 8 through the liquid outlet valve regulator 61. When the reservoir temperature reaches-22 ℃ again, the first interface 601, the second interface 602, the third interface 603, the fourth interface 604 and the freeze pump 7 of the conditioning station 6 are turned off again.
5. And returning to the step 1 after the next power price valley period comes.
Example 2
As shown in fig. 4, the refrigeration system control method of the present embodiment is as follows:
1. at first, in the electricity price valley period, the second refrigeration cycle system is started, the refrigerating pump 7 is utilized to convey the inter-cooling liquid in the cold storage water tank 5 to the inter-refrigeration-house heat exchanger 8, the inter-cooling liquid returns to the cold storage water tank 5 after passing through the inter-refrigeration-house heat exchanger 8, and the whole process is maintained for 15-20 minutes. In this process, some of the freeze pumps 7, for example two of the three freeze pumps, may be turned on, or all three of the freeze pumps may be turned on.
2. All the compressors in the main refrigeration unit 1 are started. And refrigerating the inter-cooling liquid in the cold storage water tank 5 by using a first refrigeration cycle system, and maintaining the whole process for 120 minutes.
3. A portion of the compressors in the main refrigeration unit 1 are started, for example, one of the three compressors is turned on. Refrigerating the inter-cooling liquid in the cold storage water tank 5 by using the first refrigeration cycle system, and looking up a table from a data table to obtain a first preset temperature T according to the quantity of the second day refrigerator in and out of the storage and the environmental temperature0Then the first refrigeration cycle system is required to lower the temperature of the intermediate coolant in the cold storage water tank 5 to the first predetermined temperature T0. When the inter-cooling liquid in the cold storage water tank 5 reaches the first preset temperature T0At this time, the main refrigerator group 1 is turned off.
4. When the temperature of the storage reaches-22 ℃, the second refrigeration cycle system is closed. Subsequently, the monitoring of the temperature of the storage is maintained, and when the temperature of the storage is higher than-16 ℃, the second refrigeration cycle system is started again to return the temperature of the storage to-22 ℃.
5. Before the next electricity price valley time period comes, if the temperature of the inter-cooling liquid in the cold storage water pool 5 is greater than or equal to-21 ℃, the first refrigeration cycle is automatically started to cool the inter-cooling liquid, meanwhile, the data table is modified, and the second day refrigerator is dischargedA first predetermined temperature T corresponding to the warehousing quantity and the environmental temperature0The temperature is reduced by 1 ℃, if the temperature of the middle cooling liquid in the cold storage water pool 5 is less than or equal to minus 20 ℃, the data sheet is modified to lead the second day refrigeration house to be delivered into and delivered into the refrigerator and the first preset temperature T corresponding to the environmental temperature0The temperature is increased by 1 ℃, if the temperature of the middle cooling liquid in the cold storage water tank 5 is between minus 21 ℃ and minus 20 ℃, the first preset temperature T corresponding to the warehouse-in and warehouse-out quantity and the environment temperature of the second day refrigerator in the data sheet is kept0And is not changed.
6. And returning to the step 1 after the next power price valley period comes.
The above description is only an embodiment of the present invention, and the protection scope of the present invention is not limited thereto, and any person skilled in the art should modify or replace the present invention within the technical specification of the present invention.

Claims (8)

1. A control method of a refrigeration house refrigeration system comprises a first refrigeration circulation system and a second refrigeration circulation system, wherein the first refrigeration circulation system comprises a main refrigeration unit, the first refrigeration circulation system is a direct evaporation refrigeration system, Freon R404A is used as a refrigerant, and a compressor used in the main refrigeration unit is a semi-closed screw compressor; the second refrigeration cycle system comprises a cold accumulation water pool, a freezing pump, a freezer room heat exchanger and a potassium formate-pentaerythritol-water dispersible polyisocyanate-water system middle cooling liquid flowing in pipelines mutually connected with the cold accumulation water pool, and is characterized in that the control method comprises the following steps:
starting a second refrigeration circulating system at the electricity price valley time period, conveying the inter-cooling liquid in the cold storage water tank to each inter-refrigeration house heat exchanger by using a freezing pump, returning the inter-cooling liquid to the cold storage water tank after passing through the inter-refrigeration house heat exchanger, and maintaining the first time period t in the whole process1
The main refrigerating unit is enabled to run in the state of maximum output power, the first refrigerating circulation system is utilized to refrigerate the inter-cooling liquid in the cold storage water tank, and the whole process is maintained for the second time period t2
With non-maximum output of the main refrigerating unitThe power state is operated, and the temperature of the middle cooling liquid in the cold accumulation water tank is reduced to a first preset temperature T0Conveying the intercooling liquid to the heat exchangers between the cold storages by using a freezing pump and then returning to the cold accumulation water pool; when the inter-cooling liquid in the cold accumulation water tank reaches a first preset temperature T0When the main refrigerating unit is started, the main refrigerating unit is closed; the whole process is maintained for a third time period t3
When the storage temperature reaches the set storage temperature T, closing the second refrigeration cycle system; and then, monitoring the temperature of the storage, and opening a second refrigeration cycle to reduce the temperature of the storage to the set temperature T when the temperature of the storage is higher than the upper limit T' of the temperature of the storage.
2. The freezer refrigeration system control method of claim 1, characterized in that when the temperature of the cold liquid in the cold storage pool rises to the second predetermined temperature T1When the temperature of the cold liquid in the cold storage water tank reaches the first preset temperature T, the first refrigeration cycle is started to refrigerate the temperature of the cold liquid in the cold storage water tank to the first preset temperature T0
3. The freezer refrigeration system control method of claim 1, wherein the first predetermined temperature T0The setting of the cold storage tank meets the requirement that the main refrigerating unit does not need to be started to refrigerate the inter-cooling liquid in the cold storage water tank before the next electricity price valley time period comes.
4. The freezer refrigeration system control method of claim 1, characterized by the first time period t1A second time period t2And a third duration t3The sum is less than the electricity price valley period duration.
5. The freezer refrigeration system control method of claim 1, wherein operating the main refrigeration unit at a non-maximum output power state means operating the main refrigeration unit at an 1/3 or 1/2 power level of maximum output power.
6. A control method of a refrigeration house refrigeration system comprises a first refrigeration circulation system and a second refrigeration circulation system, wherein the first refrigeration circulation system comprises a main refrigeration unit, the first refrigeration circulation system is a direct evaporation refrigeration system, Freon R404A is used as a refrigerant, and a compressor used in the main refrigeration unit is a semi-closed screw compressor; the second refrigeration cycle system comprises a cold accumulation water pool, a freezing pump, a freezer room heat exchanger and a potassium formate-pentaerythritol-water dispersible polyisocyanate-water system middle cooling liquid flowing in pipelines mutually connected with the cold accumulation water pool, and is characterized in that the control method comprises the following steps:
starting a second refrigeration circulating system at the electricity price valley time period, conveying the inter-cooling liquid in the cold storage water tank to each inter-refrigeration house heat exchanger by using a freezing pump, returning the inter-cooling liquid to the cold storage water tank after passing through the inter-refrigeration house heat exchanger, and maintaining the first time period t in the whole process1
The main refrigerating unit is enabled to run in the state of maximum output power, the first refrigerating circulation system is utilized to refrigerate the inter-cooling liquid in the cold storage water tank, and the whole process is maintained for the second time period t2
Operating the main refrigeration unit in a non-maximum output power state; according to the quantity of the second day refrigerator in and out and the environmental temperature, looking up a table from a data table to obtain a first preset temperature T0Then the first refrigeration cycle system is required to cool the temperature of the middle cooling liquid in the cold storage water tank to a first preset temperature T0(ii) a When the inter-cooling liquid in the cold accumulation water tank reaches a first preset temperature T0When the main refrigerating unit is closed, the whole process is maintained for a third time period t3
When the storage temperature reaches the set storage temperature T, closing the second refrigeration cycle system; then, the monitoring of the temperature of the storage is kept, and when the temperature of the storage is higher than the upper limit T' of the temperature of the storage, the second refrigeration cycle system is started again to make the temperature of the storage return to the set temperature T of the storage;
before the next electricity price valley time period comes, if the temperature of the middle cooling liquid in the cold storage water tank is greater than or equal to a second preset temperature T1Automatically cooling the refrigerating fluid in the first refrigerating cycle, and modifying the data table to output and input the second daily refrigerator and the first preset temperature T corresponding to the environment temperature0The temperature is reduced by 1 ℃, if the temperature of the middle coolant in the cold accumulation water tank is less than T1-1, modifying the data sheet to move the second day refrigerator in and outThe first predetermined temperature T corresponding to the storage amount and the ambient temperature0The temperature is increased by 1 ℃, if the temperature of the middle coolant in the cold accumulation water tank is less than T1And is greater than T1-1, keeping a first preset temperature T corresponding to the warehouse-in and warehouse-out quantity and the environmental temperature of the second daily freezer in the data table0And is not changed.
7. The freezer refrigeration system control method of claim 6, wherein the second day freezer in-out volume data is obtained from a freezer cargo management system.
8. The freezer refrigeration system control method of claim 6, wherein the second day ambient temperature is obtained from a weather forecast data server.
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CN101334203A (en) * 2008-08-04 2008-12-31 龙涛 Method for enhancing cold-storage density of cold storage air conditioner system and cold storage air conditioner system
CN101476759A (en) * 2008-12-29 2009-07-08 中国包装和食品机械总公司 Refrigerating device and its relative moisture control method during refrigeration
CN205316556U (en) * 2015-12-30 2016-06-15 郑州恒博科技股份有限公司 Low temperature ice cold -storage system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101334203A (en) * 2008-08-04 2008-12-31 龙涛 Method for enhancing cold-storage density of cold storage air conditioner system and cold storage air conditioner system
CN101476759A (en) * 2008-12-29 2009-07-08 中国包装和食品机械总公司 Refrigerating device and its relative moisture control method during refrigeration
CN205316556U (en) * 2015-12-30 2016-06-15 郑州恒博科技股份有限公司 Low temperature ice cold -storage system

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