Milk tank refrigeration and high-medium temperature hot water co-production system

Abstract

The invention relates to the technical field of milk tank refrigeration, and discloses a milk tank refrigeration and high-medium temperature hot water co-production system which comprises a milk tank evaporator, a throttling expansion valve, a high-temperature water tank, a medium-temperature water tank, a high-temperature heat exchanger, a medium-temperature heat exchanger, a sensor, a data acquisition module, an analysis processing module, an execution module, a compensation optimization module and an alarm triggering module. The execution module specifically comprises a compressor I, a compressor II and a compressor III; the first compressor is used for collecting high-temperature steam in the milk tank evaporator. Steam in the milk tank evaporator sequentially flows into the high-temperature heat exchanger and the medium-temperature heat exchanger for heat exchange, the steam subjected to heat exchange can be condensed into liquid to flow back into the milk tank evaporator to cool the milk tank evaporator, and the high-temperature water tank and the medium-temperature water tank can be heated by the high-temperature heat exchanger and the medium-temperature heat exchanger; and the refrigeration of the milk tank and the generation of high-temperature and medium-temperature hot water can be completed with low energy consumption through cycles.

Description

Technical Field

[0001] The invention relates to the technical field of milk tank refrigeration, and in particular to a milk tank refrigeration and high / medium temperature hot water cogeneration system. Background Art

[0002] The existing milk tanks in milking plants are cooled by air cooling units and milk tanks with evaporators at the bottom to achieve a 3-4 degree cooling of milk. During the cooling process, the air cooling units discharge heat into the air in vain, causing thermal pollution. On the other hand, milking plants need a large amount of hot water at high temperatures of 70-80 degrees and medium temperatures of 35-40 degrees. The existing hot water solution is to use coal-fired boilers to heat water, which seriously pollutes the environment. The operating costs of electric heating and gas are very high, and the maintenance costs of solar pipe bursts and frozen pipes are very high.

[0003] The existing patent discloses a system for collecting and recycling flushing water of milking and storage facilities (publication number CN108432635A), including a milking machine end, a primary cooling heat exchanger, a milk storage tank, a cooling water tank, a refrigeration system, a hot water supply tank, an acid supply tank, an alkali supply tank, and an acid collection tank, an alkali collection tank and a hot water collection tank. The milk outlet pipeline at the milking machine end passes through the primary cooling heat exchanger to the milk storage tank. In the technology disclosed in the patent, the compressor still adopts a temperature-based control method. This control method will cause the protein structure in the milk to be destroyed due to the feedback hysteresis between the compressor equipment and the temperature sensor, and then the temperature rises or drops too fast, causing the temperature to rise or fall too fast. Summary of the invention

[0004] The main technical problem solved by the present invention is to provide a milk tank refrigeration and high and medium temperature hot water cogeneration system, which solves the problems in the above-mentioned background technology.

[0005] To solve the above technical problems, according to one aspect of the present invention, more specifically, a milk tank refrigeration and high and medium temperature hot water cogeneration system includes a milk tank evaporator, a throttling expansion valve, a high temperature water tank, a medium temperature water tank, a high temperature heat exchanger, and a medium temperature heat exchanger, and also includes: a sensor, a data acquisition module, an analysis and processing module, an execution module, a compensation optimization module and an alarm triggering module; the execution module specifically includes a compressor 1, a compressor 2, and a compressor 3; The compressor 1 is used to pump the high-temperature steam in the milk tank evaporator into the high-temperature heat exchanger for heat exchange and then into the medium-temperature heat exchanger for heat exchange. After two heat exchanges, the high-temperature steam will flow back to the milk tank evaporator through the throttling expansion valve; The compressor 2 is used to pump the refrigerant liquid in the high-temperature water tank into the high-temperature heat exchanger for heat exchange to absorb the heat of the high-temperature steam, and the refrigerant liquid after absorbing the heat flows back to the high-temperature water tank for heat exchange; The compressor 3 is used to pump the refrigerant liquid in the medium-temperature water tank into the medium-temperature heat exchanger for heat exchange to absorb the waste heat of the high-temperature steam, and the refrigerant liquid after absorbing the heat flows back to the medium-temperature water tank for heat exchange; The sensors specifically include a temperature sensor, a pH sensor, a protein sensor and a fat sensor; The analysis and processing module is used to determine the working state of compressor one according to the temperatures of the high-temperature water tank and the medium-temperature water tank, the pH value of the milk in the milk tank evaporator, the protein concentration and the fat concentration; determine the working state of compressor two according to the temperature of the high-temperature water tank and the state of compressor one; and determine the working state of compressor three according to the temperature of the medium-temperature water tank and the state of compressor one.

[0006] Furthermore, the data acquisition module is used to collect temperature, pH value, protein concentration and fat concentration data detected by the sensor, and feed the data back to the analysis and processing module.

[0007] Furthermore, the analysis and processing module determines the working state of the compressor 1 according to the absolute value of the difference between the pH value of the milk in the milk tank evaporator and the set threshold value, and the increment of the protein and fat concentration per unit time, as follows: ; In the formula, represents the working state coefficient of compressor 1, Indicates the absolute value of the difference between the pH value of the milk in the milk tank evaporator and the set threshold value. It indicates the increase of milk protein in the milk tank evaporator per unit time. It indicates the increase of milk fat in the milk tank evaporator per unit time.

[0008] Furthermore, when When , it means that the flowing water content in the milk tank evaporator is too high. At this time, the compressor needs to increase the working power, and the increased working power shall not exceed 30%; when When , it means that the flowing water content in the milk tank evaporator is moderate, and there is no need to increase or reduce the working power of compressor 1; when When , it means that the flowing water content in the milk tank evaporator is low. At this time, the compressor needs to reduce the working power, and the reduced working power shall not exceed 30%.

[0009] Furthermore, the analysis and processing module determines the working state of compressor two or compressor three according to the temperature of the high-temperature water tank or the medium-temperature water tank and the state of compressor one, as follows: ; In the formula, Indicates the working state coefficient of compressor 2 or compressor 3, represents the working state coefficient of compressor 1, Indicates the working time of compressor 2 or compressor 3 at the current power. Indicates the initial detection temperature of the high temperature water tank or medium temperature water tank. Indicates that the high temperature water tank or medium temperature water tank is working in the compressor The temperature detected after a certain period of time.

[0010] Furthermore, when When , it means that compressor 2 or compressor 3 needs to increase the working power at this time, and the increased working power shall not exceed 30%; when , it means that there is no need to increase or decrease the working power of compressor 2 or compressor 3; when , it means that compressor 2 or compressor 3 needs to reduce its operating power, and the reduced operating power shall not exceed 30%.

[0011] Furthermore, the compensation optimization module is used to receive the output of the execution module and feed it back to the analysis and processing module and the alarm triggering module to compensate for the error of the instruction sent by the analysis and processing module to the execution module.

[0012] Furthermore, the alarm triggering module is used to receive feedback from the analysis and processing module and the compensation optimization module, and trigger an alarm instruction according to whether the temperature of the high-temperature water tank or the medium-temperature water tank is higher than a set threshold, and the pH value, protein concentration and fat concentration of the milk in the milk tank evaporator are lower than the set threshold.

[0013] Furthermore, the display control module is used to display the detection data of the sensor and the working status of compressor one, compressor two, and compressor three.

[0014] Beneficial Effects

[0015] 1. The present invention allows the steam in the milk tank evaporator to flow into the high-temperature heat exchanger and the medium-temperature heat exchanger in turn for heat exchange. The steam exchanged with heat will condense into liquid and flow back to the milk tank evaporator to cool it, while the high-temperature heat exchanger and the medium-temperature heat exchanger will increase the temperature of the high-temperature water tank and the medium-temperature water tank. Through such a repetitive cycle, the milk tank can be refrigerated and the high-temperature and medium-temperature hot water can be generated with low energy consumption.

[0016] 2. The present invention determines the working state of the compressor 1 and whether to adjust the working state through the absolute value of the difference between the pH value of the milk in the milk tank evaporator and the set threshold value, as well as the increment of the protein and fat concentration per unit time. This method uses the quality of the milk rather than the temperature as the control indicator, which can greatly reduce the probability of the protein structure in the milk being destroyed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 is a schematic diagram of an execution module in the present invention; Figure 3 This is a flow chart of the control system of the compressor in the present invention. DETAILED DESCRIPTION

[0018] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Example 1

[0020] like Figure 1 - As shown in 3, according to one aspect of the present invention, a milk tank refrigeration and high-medium and high-temperature hot water cogeneration system is provided, including a milk tank evaporator, a throttling expansion valve, a high-temperature water tank, a medium-temperature water tank, a high-temperature heat exchanger, and a medium-temperature heat exchanger, and also includes: a sensor, a data acquisition module, an analysis and processing module, an execution module, a compensation optimization module, and an alarm triggering module; the execution module specifically includes compressor 1, compressor 2, and compressor 3. Compressor 1 is used to pump the high-temperature steam in the milk tank evaporator into the high-temperature heat exchanger for heat exchange and then enter the medium-temperature heat exchanger for heat exchange. After two heat exchanges, the high-temperature steam will flow back to the milk tank evaporator through the throttling expansion valve; compressor 2 is used to pump the refrigerant liquid in the high-temperature water tank into the high-temperature heat exchanger for heat exchange to absorb the heat of the high-temperature steam, and the refrigerant liquid after absorbing the heat flows back to the high-temperature water tank for heat exchange; compressor 3 is used to pump the refrigerant liquid in the medium-temperature water tank into the medium-temperature heat exchanger for heat exchange to absorb the waste heat of the high-temperature steam, and the refrigerant liquid after absorbing the heat flows back to the medium-temperature water tank for heat exchange (such as Figure 1 As shown in the figure), the high-temperature steam in the milk tank evaporator is pumped into the high-temperature heat exchanger through compressor 1. At this time, compressor 2 can flow the refrigerant liquid connecting the high-temperature water tank and the high-temperature heat exchanger, so that the heat in the high-temperature steam is exchanged to the high-temperature water tank. And the discharged steam will enter the medium-temperature heat exchanger again, and compressor 3 can flow the refrigerant liquid between the medium-temperature water tank and the medium-temperature heat exchanger for heat exchange, so that the remaining heat in the steam will be exchanged to the medium-temperature water tank. The condensed water of the steam discharged from the medium-temperature heat exchanger flows back to the milk tank evaporator to cool the milk tank evaporator. In this way, the milk tank refrigeration and energy-free high and medium temperature hot water are completed in a repetitive manner.

[0021] The data acquisition module is used to collect the temperature, pH value, protein concentration and fat concentration data detected by the sensor, and feed the data back to the analysis and processing module. The sensors specifically include temperature sensors, pH sensors, protein sensors and fat sensors; the analysis and processing module is used to determine the working state of compressor one according to the temperature of the high-temperature water tank and the medium-temperature water tank, the pH value of the milk in the milk tank evaporator, the protein concentration and the fat concentration; determine the working state of compressor two according to the temperature of the high-temperature water tank and the state of compressor one; determine the working state of compressor three according to the temperature of the medium-temperature water tank and the state of compressor one (such as Figure 3 As shown), the working state of the compressor 1 and whether the working state should be adjusted can be determined by the absolute value of the difference between the pH value of the milk in the milk tank evaporator and the set threshold value, as well as the increase in protein and fat concentration per unit time.

[0022] Example 2

[0023] like Figure 3 As shown, the analysis and processing module determines the working state of the compressor 1 according to the absolute value of the difference between the pH value of the milk in the milk tank evaporator and the set threshold value, as well as the increment of the protein and fat concentration per unit time, which is: ; In the formula, represents the working state coefficient of compressor 1, Indicates the absolute value of the difference between the pH value of the milk in the milk tank evaporator and the set threshold value. It indicates the increase of milk protein in the milk tank evaporator per unit time. It indicates the increase of milk fat in the milk tank evaporator per unit time.

[0024] when When , it means that the flowing water content in the milk tank evaporator is too high. At this time, the compressor needs to increase the working power, and the increased working power shall not exceed 30%; when When , it means that the flowing water content in the milk tank evaporator is moderate, and there is no need to increase or reduce the working power of compressor 1; when When , it means that the flowing water content in the milk tank evaporator is low. At this time, the compressor needs to reduce the working power, and the reduced working power shall not exceed 30%.

[0025] The absolute value of the difference between the pH value of the milk in the milk tank evaporator and the set threshold is taken as (The absolute value of the difference = |the pH value of the milk in the milk tank evaporator currently detected - the pH value of the milk tank evaporator under normal conditions|. The pH value of the milk tank evaporator under normal conditions is pH=6.5).

[0026] The increment of milk protein per unit time in the milk tank evaporator (unit , the increment of each sampling is not less than 2. The increment per unit time = (content after evaporation - content before evaporation) ÷ unit time).

[0027] The increment of milk fat in the milk tank evaporator per unit time is (unit , the increment of each sampling is not less than 2. The increment per unit time = (content after evaporation - content before evaporation) ÷ unit time). Then:

[0028] From the above calculation, we can know that the working state coefficient of compressor 1 is At this time, the flowing water content in the milk tank evaporator is moderate, and the compressor does not need to increase or reduce the working power. By comparing multiple sets of data:

[0029] From the above calculation, we can know that when the sample data tends to infinity, the state coefficient will be used to express the state of the milk in the evaporator. When , it means that the flowing water content in the milk tank evaporator is too high; when When , it means that the flowing water content in the milk tank evaporator is moderate; when When , it means that the flowing water content in the milk tank evaporator is low.

[0030] Example 3

[0031] like Figure 3 As shown, the analysis and processing module determines the working state of compressor two or compressor three according to the temperature of the high-temperature water tank or the medium-temperature water tank and the state of compressor one, which is: ; In the formula, Indicates the working state coefficient of compressor 2 or compressor 3, represents the working state coefficient of compressor 1, Indicates the working time of compressor 2 or compressor 3 at the current power. Indicates the initial detection temperature of the high temperature water tank or medium temperature water tank. Indicates that the high temperature water tank or medium temperature water tank is working in the compressor The temperature detected after a certain period of time.

[0032] when When , it means that compressor 2 or compressor 3 needs to increase the working power at this time, and the increased working power shall not exceed 30%; when , it means that there is no need to increase or decrease the working power of compressor 2 or compressor 3; when , it means that compressor 2 or compressor 3 needs to reduce its operating power, and the reduced operating power shall not exceed 30%.

[0033] Among them, the working state coefficient of compressor 2 is calculated. The working time of compressor 2 at the current power is (minutes). The initial test temperature of the high temperature water tank is (℃). After 10 minutes, the temperature of the high temperature water tank is (℃). The working state coefficient of compressor 1 is . Then we have: ; From the above calculation, we can know that the working state coefficient of compressor 2 is . Comparison of multiple groups of data are:

[0034] From the above calculation, we can know that when the sample data tends to infinity, there will be a relationship based on the state coefficient to express whether to increase the compressor power. Then, when When , it means that the compressor needs to increase its working power, and the increased working power shall not exceed 30%; when When , it means that there is no need to increase or decrease the working power of compressor 1; when When , it means that the compressor needs to reduce its working power at this time, and the reduced working power shall not exceed 30%.

[0035] Example 4

[0036] like Figure 3 As shown, the compensation optimization module is used to receive the output of the execution module and feed back to the analysis and processing module and the alarm trigger module to compensate for the error of the analysis and processing module sending instructions to the execution module. The alarm trigger module is used to receive feedback from the analysis and processing module and the compensation optimization module, and trigger the alarm instruction according to whether the temperature of the high-temperature water tank or the medium-temperature water tank is higher than the set threshold, and the pH value, protein concentration and fat concentration of the milk in the milk tank evaporator are lower than the set threshold. The display control module is used to display the detection data of the sensor and the working status of compressor one, compressor two and compressor three.

[0037] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A milk tank refrigeration and high and medium temperature hot water cogeneration system, comprising a milk tank evaporator, a throttling expansion valve, a high temperature water tank, a medium temperature water tank, a high temperature heat exchanger, and a medium temperature heat exchanger, characterized in that: It also includes: a sensor, a data acquisition module, an analysis and processing module, an execution module, a compensation optimization module and an alarm triggering module; the execution module specifically includes compressor 1, compressor 2 and compressor 3; The compressor 1 is used to pump the high-temperature steam in the milk tank evaporator into the high-temperature heat exchanger for heat exchange and then into the medium-temperature heat exchanger for heat exchange. After two heat exchanges, the high-temperature steam will flow back to the milk tank evaporator through the throttling expansion valve; The compressor 2 is used to pump the refrigerant liquid in the high-temperature water tank into the high-temperature heat exchanger for heat exchange to absorb the heat of the high-temperature steam, and the refrigerant liquid after absorbing the heat flows back to the high-temperature water tank for heat exchange; The compressor 3 is used to pump the refrigerant liquid in the medium-temperature water tank into the medium-temperature heat exchanger for heat exchange to absorb the waste heat of the high-temperature steam, and the refrigerant liquid after absorbing the heat flows back to the medium-temperature water tank for heat exchange; The sensors specifically include a temperature sensor, a pH sensor, a protein sensor and a fat sensor; The analysis and processing module is used to determine the working state of compressor one according to the temperatures of the high-temperature water tank and the medium-temperature water tank, the pH value of the milk in the milk tank evaporator, the protein concentration and the fat concentration; determine the working state of compressor two according to the temperature of the high-temperature water tank and the state of compressor one; and determine the working state of compressor three according to the temperature of the medium-temperature water tank and the state of compressor one.

2. The milk tank refrigeration and high / medium temperature hot water cogeneration system according to claim 1, characterized in that: The data acquisition module is used to collect temperature, pH value, protein concentration and fat concentration data detected by the sensor, and feed the data back to the analysis and processing module.

3. The milk tank refrigeration and high / medium temperature hot water cogeneration system according to claim 1, characterized in that: The analysis and processing module determines the working state of the compressor 1 according to the absolute value of the difference between the pH value of the milk in the milk tank evaporator and the set threshold value, and the increment of the protein and fat concentration per unit time, as follows: ； In the formula, represents the working state coefficient of compressor 1, Indicates the absolute value of the difference between the pH value of the milk in the milk tank evaporator and the set threshold value. It indicates the increase of milk protein in the milk tank evaporator per unit time. It indicates the increase of milk fat in the milk tank evaporator per unit time.

4. The milk tank refrigeration and high / medium temperature hot water cogeneration system according to claim 3 is characterized by: when When , it means that the flowing water content in the milk tank evaporator is too high. At this time, the compressor needs to increase the working power, and the increased working power shall not exceed 30%; when When , it means that the flowing water content in the milk tank evaporator is moderate, and there is no need to increase or reduce the working power of compressor 1; when When , it means that the flowing water content in the milk tank evaporator is low. At this time, the compressor needs to reduce the working power, and the reduced working power shall not exceed 30%.

5. The milk tank refrigeration and high / medium temperature hot water cogeneration system according to claim 3 is characterized by: The analysis and processing module determines the working state of compressor two or compressor three according to the temperature of the high-temperature water tank or the medium-temperature water tank and the state of compressor one, as follows: ； In the formula, Indicates the working state coefficient of compressor 2 or compressor 3, represents the working state coefficient of compressor 1, Indicates the working time of compressor 2 or compressor 3 at the current power. Indicates the initial detection temperature of the high temperature water tank or medium temperature water tank. Indicates that the high temperature water tank or medium temperature water tank is working in the compressor The temperature detected after a certain period of time.

6. The milk tank refrigeration and high / medium temperature hot water cogeneration system according to claim 5, characterized in that: when When , it means that compressor 2 or compressor 3 needs to increase the working power at this time, and the increased working power shall not exceed 30%; when , it means that there is no need to increase or decrease the working power of compressor 2 or compressor 3; when , it means that compressor 2 or compressor 3 needs to reduce its operating power, and the reduced operating power shall not exceed 30%.

7. The milk tank refrigeration and high / medium temperature hot water cogeneration system according to claim 1, characterized in that: The compensation optimization module is used to receive the output of the execution module and feed it back to the analysis and processing module and the alarm triggering module to compensate for the error of the instruction sent by the analysis and processing module to the execution module.

8. The milk tank refrigeration and high / medium temperature hot water cogeneration system according to claim 1, characterized in that: The alarm triggering module is used to receive feedback from the analysis and processing module and the compensation optimization module, and trigger an alarm instruction according to whether the temperature of the high-temperature water tank or the medium-temperature water tank is higher than a set threshold, and whether the pH value, protein concentration and fat concentration of the milk in the milk tank evaporator are lower than the set threshold.

9. The milk tank refrigeration and high / medium temperature hot water cogeneration system according to claim 1, characterized in that: The display control module is used to display the detection data of the sensor and the working status of compressor one, compressor two and compressor three.

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