An industrial air conditioning waste heat recovery system

Abstract

The present invention provides an industrial air conditioning waste heat recovery system, which relates to the field of waste heat recovery technology. The system includes a heat exchange coil, which is installed at the return air of a refrigeration unit. The water outlet of the heat exchange coil is connected to a waste heat return pipe, and the water inlet of the heat exchange coil is connected to a waste heat supply pipe. The waste heat return pipe and the waste heat supply pipe are respectively connected to the water inlet inlet of a heat supply pipe and the return water outlet of the heat supply pipe. The water inlet outlet of a heat pump unit is connected to a customer via a heat supply pipe, and the return water inlet of the heat pump unit is connected to a customer via a heat return pipe. The present invention uses the heat exchange coil to exchange heat with indoor return air for heat recovery, fully utilizing the heat. Recovering the return air heat is equivalent to pre-cooling the return air, reducing the energy consumption of industrial air conditioners. Waste heat recovery and refrigeration are independent of each other and do not affect the refrigeration system, ensuring normal production. At the same time, the system is simple and does not involve complex processing processes. After the heat is recovered, the waste heat utilization efficiency is improved by the heat pump unit.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste heat recovery, and in particular relates to a waste heat recovery system for an industrial air conditioner. Background Art

[0002] The industrial air conditioning waste heat recovery system is a system that recovers the waste heat generated by industrial air conditioning during the refrigeration or dehumidification process and converts the waste heat into reusable thermal energy using heat exchange technology to improve energy utilization efficiency, reduce energy consumption, and alleviate environmental burden.

[0003] Traditional air-conditioning systems do not have waste heat recovery components. Due to the high return air temperature of the air conditioner, the refrigerant directly takes away a large amount of heat during the circulation process, resulting in heat waste. This phenomenon not only reduces energy utilization, but also increases operating costs and causes unnecessary resource loss. Secondly, some refrigeration systems adopt an integrated design of waste heat recovery and refrigeration. The interaction between waste heat recovery and refrigeration may have a negative impact on the stability and reliability of the original system. At the same time, if one of them fails, it may cause the risk of performance degradation of the entire system. Summary of the Invention

[0004] The present invention provides an industrial air-conditioning waste heat recovery system to solve at least one of the above-mentioned technical problems.

[0005] In order to solve the above technical problems, the present invention discloses an industrial air-conditioning waste heat recovery system, including a heat exchange coil, which is installed at the return air of the refrigeration component, the water outlet of the heat exchange coil is connected to the waste heat return pipe, and the water inlet of the heat exchange coil is connected to the waste heat supply pipe. The waste heat return pipe and the waste heat supply pipe are respectively connected to the water inlet inlet of the heating pipe and the return water outlet of the heating pipe. The water inlet outlet of the heat pump unit is connected to the customer through the heating pipe, and the return water inlet of the heat pump unit is connected to the customer through the heat return pipe.

[0006] Preferably, the refrigeration component includes an industrial air conditioner, which is installed in an industrial plant. An air supply outlet is provided under the industrial air conditioner, which is used to deliver cold air into the industrial production environment. A heat exchange coil is installed on the industrial air conditioner, and the hot air is returned to the industrial air conditioner through the return air outlet of the industrial air conditioner after heat recovery through the heat exchange coil.

[0007] Preferably, the industrial production environment and the industrial air conditioner are separated by an inner partition wall and a ventilation grid, and the heat exchange coil is installed on a coil bracket.

[0008] Preferably, a heat exchange coil surface cleaning module is further included, which is used to monitor and predict the working status of the heat exchange coil in the next detection cycle, and clean the surface of the heat exchange coil based on the prediction result.

[0009] Preferably, the heat exchange coil surface cleaning module includes:

[0010] A data acquisition unit is used to collect the mass flow rate of the heat exchange coil, the temperature of the medium at the inlet and outlet of the heat exchange coil, the pressure of the medium at the inlet and outlet of the heat exchange coil, and the flow rate of the medium at the inlet and outlet of the heat exchange coil;

[0011] The heat exchange capacity evaluation value calculation unit is used to calculate the heat exchange capacity evaluation value of the heat exchange coil in each detection cycle based on the collection results of the data collection unit ;

[0012] A cleaning prediction matrix building unit is used to build a cleaning prediction matrix for the heat exchange coil based on the heat exchange capacity evaluation value of the heat exchange coil in each detection cycle;

[0013] The first cleaning judgment unit is used to predict the heat exchange capacity evaluation value of the heat exchange coil in the next detection cycle based on the cleaning prediction matrix of the heat exchange coil, and compare the prediction result with the basic evaluation value of the heat exchange capacity of the heat exchange coil. If the heat exchange capacity evaluation value of the heat exchange coil in the next detection cycle is less than the basic evaluation value of the heat exchange capacity of the heat exchange coil, a further judgment prompt is issued to the second cleaning judgment unit; otherwise, no prompt is issued;

[0014] The second cleaning judgment unit is used to calculate the actual flow resistance capacity of the heat exchange coil wall dirt. If the actual flow resistance capacity of the heat exchange coil wall dirt is greater than the preset flow resistance capacity of the heat exchange coil wall dirt, a cleaning response execution unit is issued an inner wall dirt cleaning prompt; otherwise, a cleaning response execution unit is issued an outer wall dirt cleaning prompt;

[0015] The cleaning response execution unit is used to respond to the cleaning prompt issued by the cleaning judgment unit 2 and clean the inner wall or the outer wall of the heat exchange coil.

[0016] Preferably, the heat transfer capacity evaluation value of the heat exchange coil is:

[0017] (1); among them, is the heat transfer capacity evaluation value of the heat exchange coil in the i-th detection cycle, is the mass flow rate of the medium in the heat exchange coil during the i-th detection cycle, is the specific heat capacity of the medium in the heat exchange coil, is the temperature of the medium at the inlet end of the heat exchange coil in the i-th detection cycle, is the temperature of the medium at the outlet of the heat exchange coil in the i-th detection cycle, lg is the logarithm with base 10, is the pressure at the inlet of the heat exchange coil in the i-th detection cycle, is the pressure at the outlet of the heat exchange coil in the i-th detection cycle, is the reference pressure difference at both ends of the heat exchange coil, is the base heat transfer coefficient of the heat exchange coil, is the surface area of ​​the heat exchange coil, It is the preset reference temperature after the medium in the heat exchange coil is cooled. is the logarithm to the base e.

[0018] Preferably, based on the heat exchange capacity evaluation value of the heat exchange coil in each detection cycle, a cleaning prediction matrix of the heat exchange coil is constructed:

[0019] Sort the heat transfer capacity evaluation values ​​of the heat exchange coils in time sequence to obtain the first row of the clean prediction matrix, use the difference between the right value of each element in the first row of the clean prediction matrix and the element as the second row element corresponding to the element, wherein the second row element corresponding to the last element in the first row is set to the same value as the second row element corresponding to the first element in the first row, and all the second row elements constitute the second row of the clean prediction matrix, use the difference between the left value of each element in the first row of the clean prediction matrix and the element as the third row element corresponding to the element, wherein the third row element corresponding to the first element in the first row is set to the same value as the third row element corresponding to the last element in the first row, and all the third row elements constitute the third row of the clean prediction matrix;

[0020] (2); among them, is the cleaning prediction matrix of the heat exchange coil in the i-th detection cycle, is the heat transfer capacity evaluation value of the heat exchange coil in the first test cycle, is the heat transfer capacity evaluation value of the heat exchange coil in the second test cycle, is the heat transfer capacity evaluation value of the heat exchange coil in the i-th detection cycle.

[0021] Preferably, the heat exchange capacity evaluation value of the heat exchange coil in the next detection cycle is predicted based on the clean prediction matrix of the heat exchange coil:

[0022] Obtain the mean of all matrix elements in the third row of the cleaning prediction matrix of the heat exchange coil in the i-th detection cycle, and modify the value of the last column of the cleaning prediction matrix of the heat exchange coil in the i-th detection cycle to the same value as the mean of all matrix elements in the third row to obtain a new matrix, and use the rank of the new matrix as the heat exchange capacity evaluation value of the heat exchange coil in the i+1-th detection cycle.

[0023] Preferably, the actual flow resistance of the heat exchange coil wall dirt is:

[0024] (3); among them, is the actual flow resistance of the heat exchange coil wall fouling in the i-th detection cycle, is the Reynolds number, is the exponential with base e, is the flow rate of the medium at the inlet end of the heat exchange coil in the i-th detection cycle, is the flow rate of the medium at the outlet of the heat exchange coil in the i-th detection cycle, is the difference in velocity between the two ends of the heat exchange coil and the reference velocity.

[0025] Preferably, an air dust removal and purification device is provided in front of the ventilation grille, and a dust removal and purification control module is provided in the air dust removal and purification device. The dust removal and purification control module is used to control the operation of the air dust removal and purification device based on the dust density calculated in real time, including:

[0026] Step 1: Calculate the dust density of the air in the air dust removal and purification equipment:

[0027] (4); among them, The dust density in the air of the air dust removal and purification equipment, and the impact force on the screen in the air dust removal and purification equipment , is the pressure value at the inlet of the air dust removal and purification equipment, is the pressure value at the outlet of the air dust removal and purification equipment, The flow rate of the air dust removal and purification equipment, is the air flow resistance, L is the length of the air dust removal and purification equipment pipeline, The diameter of the air dust removal and purification equipment pipe, is the flow rate at the inlet of the air dust removal and purification equipment, is the flow rate at the outlet of the air dust removal and purification equipment, and A is the inner wall area of ​​the air dust removal and purification equipment pipeline;

[0028] Step 2: Based on step 1, calculate the dust removal level required for the air dust removal and purification equipment:

[0029] (5); among them, It is the dust removal level required by the air dust removal and purification equipment. The higher the dust removal level, the better the dust removal effect. It is the benchmark dust density of the air in the air dust removal and purification equipment. is the base 10 logarithm, The current dust removal efficiency of the air dust removal and purification equipment;

[0030] Step 3: Control the operation of the air dust removal and purification equipment based on the calculated dust removal level required by the air dust removal and purification equipment.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention uses a heat exchange coil to exchange heat with indoor return air for heat recovery, making full use of heat. Recovering the return air heat is equivalent to pre-cooling the return air, reducing the energy consumption of industrial air conditioning (2). Waste heat recovery and refrigeration are independent of each other and do not affect the refrigeration system, which can ensure normal production. At the same time, the system is simple and does not involve complex processing processes. After the heat is recovered, the waste heat utilization efficiency is improved through the heat pump unit (13). BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0034] Figure 1 This is a schematic diagram of the overall workflow of the present invention;

[0035] Figure 2 Connected to the heat exchange coil of the present invention.

[0036] In the figure: 1. Industrial plant; 2. Industrial air conditioner; 3. Air supply vent; 4. Cold air; 5. Industrial production environment; 6. Hot air; 7. Internal partition wall; 8. Ventilation grille; 9. Heat exchange coil; 10. Coil bracket; 11. Industrial air conditioner return air vent; 12. Waste heat return pipe; 13. Heat pump unit; 14. Waste heat water supply pipe; 15. Heating pipe; 16. Heat return pipe. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0038] In addition, in the present invention, descriptions such as "first" and "second" are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but this must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] The present invention provides the following embodiments

[0040] Example 1

[0041] The embodiment of the present invention provides an industrial air conditioning waste heat recovery system, such as Figure 1 and Figure 2 As shown, it includes a heat exchange coil 9, which is installed at the return air part of the refrigeration component. The water outlet of the heat exchange coil 9 is connected to the waste heat return pipe 12, and the water inlet of the heat exchange coil 9 is connected to the waste heat supply pipe 14. The waste heat return pipe 12 and the waste heat supply pipe 14 are respectively connected to the water inlet inlet of the heating pipe 15 and the return water outlet of the heating pipe 15. The water inlet outlet of the heat pump unit 13 is connected to the customer through the heating pipe 15, and the return water inlet of the heat pump unit 13 is connected to the customer through the heat return pipe 16.

[0042] Preferably, the refrigeration component includes an industrial air conditioner 2, which is installed in an industrial plant 1. An air supply port 3 is provided under the industrial air conditioner 2, and the air supply port 3 is used to send cold air 4 into the industrial production environment 5. A heat exchange coil 9 is installed on the industrial air conditioner 2. The hot air 6 recovers heat through the heat exchange coil 9 and returns to the industrial air conditioner 2 through the industrial air conditioner return air port 11.

[0043] Preferably, the industrial production environment 5 and the industrial air conditioner 2 are separated by an inner partition wall 7 and a ventilation grille 8 , and the heat exchange coil 9 is installed on a coil bracket 10 .

[0044] The working principle and beneficial effects of the above technical solution are as follows: in an industrial plant 1, after the industrial air conditioner 2 cools, cold air 4 is delivered through the air outlet 3 to cool the industrial production environment 5. The cold air 4 absorbs heat and becomes hot air 6. The hot air 6 first passes through the heat exchange coil 9 to recover the heat, and then returns to the industrial air conditioner 1 through the industrial air conditioner return air outlet 11. The cooling capacity of the industrial air conditioner 2 is provided by the refrigeration system composed of the chiller and other components in the cold station. The industrial production environment 5 and the air-conditioned room are separated by an internal partition wall 7 and a ventilation grille 8. The heat exchange coil 9 is fixed by a coil bracket 10.

[0045] After the heat is absorbed by the heat exchange coil 11, it is sent to the heat pump unit 13 through the waste heat return pipe 12, and then returned to the heat exchange coil 9 in the machine room through the waste heat supply pipe 14. The low-temperature heat energy is converted into high-temperature heat energy after being upgraded by the heat pump unit 13 and supplied to the user through the heat supply pipe 15. After the user uses it, it returns to the heat pump unit 13 through the heat return pipe 16, and then is sent back to the heat exchange coil 9 through the heat return pipe 16;

[0046] The present invention uses a heat exchange coil 9 to exchange heat with indoor return air for heat recovery, making full use of heat. Recovering the return air heat is equivalent to pre-cooling the return air, reducing the energy consumption of the industrial air conditioner 2. Waste heat recovery and refrigeration are independent of each other and do not affect the refrigeration system, which can ensure normal production. At the same time, the system is simple and does not involve complex processing processes. After the heat is recovered, the waste heat utilization efficiency is improved through the heat pump unit 13.

[0047] Example 2

[0048] On the basis of Example 1, a heat exchange coil surface cleaning module is further included, which is used to monitor and predict the working status of the heat exchange coil 9 in the next detection cycle, and clean the surface of the heat exchange coil 9 based on the prediction result.

[0049] The working principle and beneficial effects of the above technical solution are as follows: the heat exchange coil surface cleaning module can monitor and predict the working status of the heat exchange coil 9 in real time, ensuring that it operates under optimal working conditions. By actively cleaning based on the prediction results, it effectively prevents the decline in heat exchange efficiency, maintains the high efficiency of the system, extends the service life of the equipment, and further improves the energy efficiency and economy of the entire waste heat recovery system.

[0050] Example 3

[0051] Based on Example 2, the heat exchange coil surface cleaning module includes:

[0052] A data acquisition unit is used to collect the mass flow rate of the heat exchange coil 9, the temperature of the medium at the inlet and outlet ends of the heat exchange coil 9, the pressure of the medium at the inlet and outlet ends of the heat exchange coil 9, and the flow rate of the medium at the inlet and outlet ends of the heat exchange coil 9;

[0053] The heat exchange capacity evaluation value calculation unit is used to calculate the heat exchange capacity evaluation value of the heat exchange coil 9 in each detection cycle based on the collection results of the data collection unit. ;

[0054] A cleaning prediction matrix construction unit, configured to construct a cleaning prediction matrix for the heat exchange coil 9 based on the heat exchange capacity evaluation value of the heat exchange coil 9 in each detection cycle;

[0055] The first cleaning judgment unit is used to predict the heat exchange capacity evaluation value of the heat exchange coil 9 in the next detection cycle based on the cleaning prediction matrix of the heat exchange coil 9, and compare the prediction result with the basic evaluation value of the heat exchange capacity of the heat exchange coil 9. If the heat exchange capacity evaluation value of the heat exchange coil 9 in the next detection cycle is less than the basic evaluation value of the heat exchange capacity of the heat exchange coil 9, a further judgment prompt is issued to the second cleaning judgment unit; otherwise, no prompt is issued;

[0056] The second cleaning judgment unit is used to calculate the actual flow resistance capacity of the wall dirt of the heat exchange coil 9. If the actual flow resistance capacity of the wall dirt of the heat exchange coil 9 is greater than the preset flow resistance capacity of the wall dirt of the heat exchange coil 9, a reminder to clean the inner wall dirt is sent to the cleaning response execution unit; otherwise, a reminder to clean the outer wall dirt is sent to the cleaning response execution unit;

[0057] The cleaning response execution unit is used to respond to the cleaning prompt issued by the cleaning judgment unit 2 and clean the inner wall or the outer wall of the heat exchange coil 9.

[0058] The working principle and beneficial effects of the above technical solution are as follows: the heat exchange coil surface cleaning module significantly improves the intelligent maintenance level of the heat exchange coil 9 through multi-level data collection and analysis. The data acquisition unit monitors key operating parameters in real time, and obtains the heat exchange capacity evaluation value through the heat exchange capacity evaluation value calculation unit. The cleaning prediction matrix is ​​constructed based on this. The hierarchical judgment mechanism of the cleaning judgment unit ensures that the cleaning program will only be started when the heat exchange capacity drops below the set threshold. The cleaning judgment unit 2 calculates the actual flow resistance capacity and accurately judges whether it is necessary to clean the inner wall or the outer wall at this time, which effectively ensures the cleanliness and heat exchange efficiency of the heat exchange coil, reduces manual intervention, improves the automation and operation efficiency of the system, and promotes more efficient energy recovery and utilization.

[0059] Example 4

[0060] Based on Example 3, the heat exchange capacity evaluation value of the heat exchange coil 9 is:

[0061] (1); among them, is the heat exchange capacity evaluation value of the heat exchange coil 9 in the i-th detection cycle, is the mass flow rate of the medium in the heat exchange coil 9 during the i-th detection cycle, is the specific heat capacity of the medium in the heat exchange coil 9, is the temperature of the medium at the inlet end of the heat exchange coil 9 in the i-th detection cycle, is the temperature of the medium at the outlet of the heat exchange coil 9 in the i-th detection cycle, lg is the logarithm with base 10, is the pressure at the inlet of the heat exchange coil 9 during the i-th detection cycle, is the pressure at the outlet of the heat exchange coil 9 during the i-th detection cycle, is the reference pressure difference at both ends of the heat exchange coil 9, is the reference heat transfer coefficient of the heat exchange coil 9, is the surface area of ​​the heat exchange coil 9, is the preset reference temperature after the medium in the heat exchange coil 9 is cooled down. is the logarithm to the base e.

[0062] The working principle and beneficial effects of the above technical solution: The calculation method of the heat exchange capacity evaluation value provides accurate quantification of the performance of the heat exchange coil 9 by comprehensively considering multiple key parameters (such as mass flow rate, specific heat capacity, inlet and outlet temperature, pressure, etc.), which can effectively reflect the actual heat exchange state and ensure that the working efficiency and heat exchange capacity of the heat exchange coil 9 are accurately grasped in each detection cycle. The calculation of the heat exchange capacity evaluation value of the heat exchange coil 9 not only enhances the system's monitoring ability of the heat exchange efficiency, but also provides a scientific basis for cleaning prediction and maintenance decision-making, further improving the heat exchange efficiency, reducing energy loss, and ensuring efficient and stable operation of the system.

[0063] Example 5

[0064] On the basis of Example 3, based on the heat exchange capacity evaluation value of the heat exchange coil 9 in each detection cycle, a cleaning prediction matrix of the heat exchange coil 9 is constructed:

[0065] Sort the heat exchange capacity evaluation values ​​of the heat exchange coil 9 in time series to obtain the first row of the clean prediction matrix, use the difference between the right value of each element in the first row of the clean prediction matrix and the element as the second row element corresponding to the element, wherein the second row element corresponding to the last element in the first row is set to the same value as the second row element corresponding to the first element in the first row, and all the second row elements constitute the second row of the clean prediction matrix, use the difference between the left value of each element in the first row of the clean prediction matrix and the element as the third row element corresponding to the element, wherein the third row element corresponding to the first element in the first row is set to the same value as the third row element corresponding to the last element in the first row, and all the third row elements constitute the third row of the clean prediction matrix;

[0066] (2); among them, is the cleaning prediction matrix of the heat exchange coil 9 in the i-th detection cycle, is the heat exchange capacity evaluation value of the heat exchange coil 9 in the first detection cycle, is the heat exchange capacity evaluation value of the heat exchange coil 9 in the second detection cycle, is the heat exchange capacity evaluation value of the heat exchange coil 9 in the i-th detection cycle.

[0067] The working principle and beneficial effects of the above technical solution are as follows: the constructed cleaning prediction matrix of the heat exchange coil 9 systematically analyzes the heat exchange capacity evaluation value of each detection cycle through time series sorting and difference calculation, which not only clearly shows the changing trend of the heat exchange capacity, but also reflects the possible dirt accumulation through the up and down differences, further enhancing the accuracy of the prediction. By combining the difference with the corresponding evaluation value, it can efficiently identify when cleaning is required, thereby optimizing the maintenance cycle, reducing maintenance costs, and effectively improving the intelligence level of the system, ensuring that the heat exchange coil always operates in the best working condition, thereby improving the overall energy efficiency and economy. At the same time, the cleaning prediction matrix of the heat exchange coil 9 will be updated in each detection cycle to ensure the accuracy of the prediction results.

[0068] Example 6

[0069] On the basis of Example 5, the heat exchange capacity evaluation value of the heat exchange coil 9 in the next detection cycle is predicted based on the cleaning prediction matrix of the heat exchange coil 9:

[0070] Obtain the mean of all matrix elements in the third row of the cleaning prediction matrix of the heat exchange coil 9 in the i-th detection cycle, and modify the value of the last column of the cleaning prediction matrix of the heat exchange coil 9 in the i-th detection cycle to the same value as the mean of all matrix elements in the third row to obtain a new matrix, and use the rank of the new matrix as the heat exchange capacity evaluation value of the heat exchange coil 9 in the i+1-th detection cycle.

[0071] The working principle and beneficial effects of the above technical solution are as follows: the heat exchange capacity evaluation value of the next detection cycle is predicted by the cleaning prediction matrix based on the heat exchange coil 9, the historical data is effectively integrated by the mean calculation method, and the mean of all elements in the third row is obtained and applied to the construction of the new matrix to ensure that the prediction result is more stable and reliable. The rank of the new matrix is ​​used as the heat exchange capacity evaluation value of the i+1th detection cycle, which not only improves the accuracy of the prediction of future working conditions, but also provides a scientific basis for maintenance and cleaning decisions, enhances the intelligent prediction ability of the system, helps to timely discover potential problems, optimize the operating efficiency of the heat exchange coil, and ultimately improve the energy efficiency of the overall system.

[0072] Example 7

[0073] Based on Example 3, the actual flow resistance of the heat exchange coil 9 due to wall fouling is:

[0074] (3); among them, is the actual flow resistance of the wall fouling of the heat exchange coil 9 in the i-th detection cycle, is the Reynolds number, is the exponential with base e, is the flow rate of the medium at the inlet end of the heat exchange coil 9 in the i-th detection cycle, is the flow rate of the medium at the outlet of the heat exchange coil 9 in the i-th detection cycle, is the difference in flow rate between the two ends of the heat exchange coil 9 and the reference flow rate.

[0075] The working principle and beneficial effects of the above technical solution are as follows: by introducing the calculation of the actual flow resistance capacity of the wall dirt of the heat exchange coil 9, the accumulation of dirt on the inner wall of the heat exchange coil 9 can be accurately evaluated. Combining important parameters such as the Reynolds number, flow velocity, and reference flow velocity difference, it reflects the actual flow state of the fluid in the heat exchange coil. By monitoring and analyzing the flow resistance of the wall dirt, it is possible to rule out whether the cause of insufficient heat exchange capacity is the accumulation of dirt on the inner wall of the heat exchange coil 9. If so, the inner wall of the heat exchange coil 9 is cleaned. If not, the cause of insufficient heat exchange capacity is the accumulation of dirt on the outer wall of the heat exchange coil 9, and the outer wall of the heat exchange coil 9 needs to be cleaned, thereby effectively improving the working efficiency of the heat exchange coil, extending the service life of the equipment, and optimizing the energy efficiency performance of the entire system.

[0076] Example 8

[0077] On the basis of Example 1, an air dust removal and purification device is provided in front of the ventilation grille 8, and a dust removal and purification control module is provided in the air dust removal and purification device. The dust removal and purification control module is used to control the operation of the air dust removal and purification device based on the real-time calculated dust density, including:

[0078] Step 1: Calculate the dust density of the air in the air dust removal and purification equipment:

[0079] (4); among them, The dust density in the air of the air dust removal and purification equipment, and the impact force on the screen in the air dust removal and purification equipment , is the pressure value at the inlet of the air dust removal and purification equipment, is the pressure value at the outlet of the air dust removal and purification equipment, The flow rate of the air dust removal and purification equipment, is the air flow resistance, L is the length of the air dust removal and purification equipment pipeline, The diameter of the air dust removal and purification equipment pipe, is the flow rate at the inlet of the air dust removal and purification equipment, is the flow rate at the outlet of the air dust removal and purification equipment, and A is the inner wall area of ​​the air dust removal and purification equipment pipeline;

[0080] Step 2: Based on step 1, calculate the dust removal level required for the air dust removal and purification equipment:

[0081] (5); among them, It is the dust removal level required by the air dust removal and purification equipment. The higher the dust removal level, the better the dust removal effect. It is the benchmark dust density of the air in the air dust removal and purification equipment. is the base 10 logarithm, The current dust removal efficiency of the air dust removal and purification equipment;

[0082] Step 3: Control the operation of the air dust removal and purification equipment based on the calculated dust removal level required by the air dust removal and purification equipment.

[0083] The working principle and beneficial effects of the above technical solution are as follows: the industrial air-conditioning waste heat recovery system realizes intelligent monitoring and optimization of air quality by integrating high-efficiency air dust removal and purification equipment, preventing a large amount of dust from entering the industrial air-conditioning 2 or falling on the heat exchange coil 9. The built-in control module of the dust removal and purification equipment can calculate the dust density of the air in real time, and automatically adjust the working status of the equipment according to this data, and dynamically adjust the operation of the equipment to ensure the best dust removal effect. It not only improves the efficiency of air purification and reduces energy consumption, but also extends the service life of the equipment, improves the overall air quality of the industrial environment, and provides a cleaner and healthier working environment for industrial production.

[0084] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. An industrial air conditioning waste heat recovery system, characterized by: The heat exchange coil (9) is installed at the return air position of the refrigeration component, the water outlet of the heat exchange coil (9) is connected to the waste heat return pipe (12), the water inlet of the heat exchange coil (9) is connected to the waste heat supply pipe (14), the waste heat return pipe (12) and the waste heat supply pipe (14) are respectively connected to the water inlet of the heating pipe (15) and the return water outlet of the heating pipe (15), the water inlet outlet of the heat pump unit (13) is connected to the customer through the heating pipe (15), and the return water inlet of the heat pump unit (13) is connected to the customer through the heat return pipe (16); The industrial air conditioning waste heat recovery system further includes a heat exchange coil surface cleaning module for monitoring and predicting the working state of the heat exchange coil (9) in the next detection cycle, and cleaning the surface of the heat exchange coil (9) based on the prediction result; The heat exchange coil surface cleaning module comprises: a data acquisition unit for collecting the mass flow of the heat exchange coil (9), the temperature of the medium at the inlet and outlet ends of the heat exchange coil (9), the pressure of the medium at the inlet and outlet ends of the heat exchange coil (9), and the flow rate of the medium at the inlet and outlet ends of the heat exchange coil (9); A heat exchange capacity evaluation value calculation unit is used to calculate the heat exchange capacity evaluation value of the heat exchange coil (9) in each detection cycle based on the collection results of the data collection unit. ; A cleaning prediction matrix construction unit is used to construct a cleaning prediction matrix of the heat exchange coil (9) based on the heat exchange capacity evaluation value of the heat exchange coil (9) in each detection cycle; The cleaning judgment unit 1 is used to predict the heat exchange capacity evaluation value of the heat exchange coil (9) in the next detection cycle based on the cleaning prediction matrix of the heat exchange coil (9), and compare the prediction result with the heat exchange capacity basic evaluation value of the heat exchange coil (9). If the heat exchange capacity evaluation value of the heat exchange coil (9) in the next detection cycle is less than the heat exchange capacity basic evaluation value of the heat exchange coil (9), a further judgment prompt is issued to the cleaning judgment unit 2; otherwise, no prompt is issued; The cleaning judgment unit 2 is used to calculate the actual flow resistance capacity of the tube wall dirt of the heat exchange coil (9), and if the actual flow resistance capacity of the tube wall dirt of the heat exchange coil (9) is greater than the preset flow resistance capacity of the tube wall dirt of the heat exchange coil (9), an inner wall dirt cleaning prompt is sent to the cleaning response execution unit; otherwise, an outer wall dirt cleaning prompt is sent to the cleaning response execution unit; The cleaning response execution unit is used to respond to the cleaning prompt issued by the cleaning judgment unit 2 and clean the inner wall or the outer wall of the heat exchange coil (9).

2. The industrial air conditioning waste heat recovery system according to claim 1, characterized in that: The refrigeration component includes an industrial air conditioner (2), which is installed in an industrial plant (1). An air supply port (3) is provided below the industrial air conditioner (2), and the air supply port (3) is used to supply cold air (4) into an industrial production environment (5). A heat exchange coil (9) is installed on the industrial air conditioner (2), and hot air (6) is returned to the industrial air conditioner (2) through the industrial air conditioner return port (11) after heat is recovered through the heat exchange coil (9).

3. The industrial air conditioning waste heat recovery system according to claim 2, characterized in that: The industrial production environment (5) is separated from the industrial air conditioner (2) by an inner partition wall (7) and a ventilation grid (8), and the heat exchange coil (9) is installed on the coil bracket (10).

4. The industrial air conditioning waste heat recovery system according to claim 3, characterized in that: Estimated heat transfer capacity of the heat exchange coil (9): ;in, is the heat transfer capacity evaluation value of the heat exchange coil (9) in the i-th detection cycle, is the mass flow rate of the medium in the heat exchange coil (9) during the i-th detection cycle, is the specific heat capacity of the medium in the heat exchange coil (9), is the temperature of the medium at the inlet end of the heat exchange coil (9) in the i-th detection cycle, is the temperature of the medium at the outlet of the heat exchange coil (9) in the i-th detection cycle, lg is the logarithm with base 10, is the pressure at the inlet of the heat exchange coil (9) during the i-th detection cycle, is the pressure at the outlet of the heat exchange coil (9) during the i-th detection cycle, is the reference pressure difference at both ends of the heat exchange coil (9), is the reference heat transfer coefficient of the heat exchange coil (9), is the surface area of ​​the heat exchange coil (9), is the preset reference temperature of the medium in the heat exchange coil (9) after cooling. is the logarithm to the base e.

5. The industrial air conditioning waste heat recovery system according to claim 3, characterized in that: Based on the heat exchange capacity evaluation value of the heat exchange coil (9) in each detection cycle, a cleaning prediction matrix of the heat exchange coil (9) is constructed: The heat transfer capacity evaluation values ​​of the heat exchange coil (9) are sorted in time sequence to obtain the first row of the clean prediction matrix, and the difference between the right value of each element in the first row of the clean prediction matrix and the element is used as the second row element corresponding to the element, wherein the second row element corresponding to the last element in the first row is set to the same value as the second row element corresponding to the first element in the first row, and all the second row elements constitute the second row of the clean prediction matrix, and the difference between the left value of each element in the first row of the clean prediction matrix and the element is used as the third row element corresponding to the element, wherein the third row element corresponding to the first element in the first row is set to the same value as the third row element corresponding to the last element in the first row, and all the third row elements constitute the third row of the clean prediction matrix; ;in, is the cleaning prediction matrix of the heat exchange coil (9) in the i-th detection cycle, is the heat transfer capacity evaluation value of the heat exchange coil (9) in the first detection cycle, is the heat transfer capacity evaluation value of the heat exchange coil (9) in the second detection cycle, is the heat transfer capacity evaluation value of the heat exchange coil (9) in the i-th detection cycle.

6. The industrial air conditioning waste heat recovery system according to claim 5, characterized in that: The heat exchange capacity evaluation value of the heat exchange coil (9) in the next detection cycle is predicted based on the clean prediction matrix of the heat exchange coil (9): The mean value of all matrix elements in the third row of the cleaning prediction matrix of the heat exchange coil (9) in the i-th detection cycle is obtained, and the value of the last column of the cleaning prediction matrix of the heat exchange coil (9) in the i-th detection cycle is modified to the same value as the mean value of all matrix elements in the third row to obtain a new matrix, and the rank of the new matrix is ​​used as the heat exchange capacity evaluation value of the heat exchange coil (9) in the i+1-th detection cycle.

7. The industrial air conditioning waste heat recovery system according to claim 3, characterized in that: Actual flow resistance of heat exchange coil (9) due to wall fouling: ;in, is the actual flow resistance of the wall fouling of the heat exchange coil (9) in the i-th detection cycle, is the Reynolds number, is the exponential with base e, is the flow rate of the medium at the inlet end of the heat exchange coil (9) in the i-th detection cycle, is the flow rate of the medium at the outlet of the heat exchange coil (9) in the i-th detection cycle, is the difference in flow rate between the two ends of the heat exchange coil (9).

8. The industrial air conditioning waste heat recovery system according to claim 3, characterized in that: An air dust removal and purification device is provided in front of the ventilation grid (8), and a dust removal and purification control module is provided in the air dust removal and purification device. The dust removal and purification control module is used to control the operation of the air dust removal and purification device based on the dust density calculated in real time, and includes: Step 1: Calculate the dust density of the air in the air dust removal and purification equipment: ;in, The dust density in the air of the air dust removal and purification equipment, and the impact force on the screen in the air dust removal and purification equipment , is the pressure value at the inlet of the air dust removal and purification equipment, is the pressure value at the outlet of the air dust removal and purification equipment, The flow rate of the air dust removal and purification equipment, is the air flow resistance, L is the length of the air dust removal and purification equipment pipeline, The diameter of the air dust removal and purification equipment pipe, is the flow rate at the inlet of the air dust removal and purification equipment, is the flow rate at the outlet of the air dust removal and purification equipment, and A is the inner wall area of ​​the air dust removal and purification equipment pipeline; Step 2: Based on step 1, calculate the dust removal level required for the air dust removal and purification equipment: ;in, It is the dust removal level required by the air dust removal and purification equipment. The higher the dust removal level, the better the dust removal effect. It is the benchmark dust density of the air in the air dust removal and purification equipment. is the base 10 logarithm, The current dust removal efficiency of the air dust removal and purification equipment; Step 3: Control the operation of the air dust removal and purification equipment based on the calculated dust removal level required by the air dust removal and purification equipment.

Images