CN116642365A - Self-adaptive water quantity energy-saving control method based on surface cooler - Google Patents
Self-adaptive water quantity energy-saving control method based on surface cooler Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 162
- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000001816 cooling Methods 0.000 claims abstract description 153
- 239000000498 cooling water Substances 0.000 claims abstract description 146
- 238000007710 freezing Methods 0.000 claims abstract description 142
- 230000008014 freezing Effects 0.000 claims abstract description 142
- 238000012546 transfer Methods 0.000 claims abstract description 100
- 239000002912 waste gas Substances 0.000 claims abstract description 80
- 238000004364 calculation method Methods 0.000 claims abstract description 25
- 239000007789 gas Substances 0.000 claims description 54
- 230000006870 function Effects 0.000 claims description 16
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- 239000011248 coating agent Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 11
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- 238000004590 computer program Methods 0.000 claims description 8
- 230000003044 adaptive effect Effects 0.000 claims description 7
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- 239000002699 waste material Substances 0.000 description 2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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Abstract
The invention belongs to the technical field of waste gas treatment, and particularly relates to a self-adaptive water quantity energy-saving control method based on a surface cooler, which comprises the following steps of: s1: acquiring an NMP waste gas data set and a surface cooler data set, and presetting an NMP waste gas outlet temperature; s2: dividing the surface cooler into a cooling section and a freezing section, and establishing a heat calculation model by combining the heat transfer coefficient outside the pipe; s3: taking the running cost of the surface cooler as an optimized objective function; s4: calculating and obtaining the lowest running cost of the surface cooler at the current preset NMP waste gas outlet temperature and the calculated variable values of the cooling section and the freezing section corresponding to the lowest running cost; s5: based on the variable data obtained by calculation, drawing a related characteristic curve graph of the cooling water inlet temperature and the calculated variables by using drawing software, obtaining a corresponding association relation, designing a regulation and control parameter according to data points corresponding to the association relation, and carrying out final automatic regulation and control so as to adaptively regulate the water quantity of cooling water and chilled water.
Description
Technical Field
The invention belongs to the technical field of waste gas treatment, and particularly relates to a self-adaptive water quantity energy-saving control method based on a surface cooler.
Background
In the NMP waste gas recovery process system, the NMP waste gas recovery process system comprises a lithium battery anode and cathode coating machine, a waste heat recovery device, a condensation host, a VOC rotating wheel or an absorption tower and the like, and plays an indispensable role in the whole system. The condensing host comprises a surface cooler inside, and can be divided into a cooling section and a freezing section according to different water temperatures, the corresponding water is called cooling water and freezing water, the temperature of the cooling section is influenced by the ambient temperature based on the prior art, and the temperature of the freezing water is obtained through a freezing mechanism and is set to be a constant value; NMP waste gas temperature is higher after passing through waste heat recovery device, need reduce outlet temperature through the surface cooler, and reduce NMP waste gas concentration simultaneously.
At present, in a surface cooler of an NMP waste gas recovery system, a method for reversely and automatically adjusting the quantity of chilled water according to the temperature of an NMP waste outlet is selected so as to reduce the temperature of the outlet to a preset temperature; however, in the prior art, the following disadvantages mainly exist:
(1) And controlling the consumption of cooling water. In general, the valve opening of the cooling water is kept at the maximum to cool the NMP waste gas; however, the air volume and the temperature of the NMP waste gas from the coating machine are fluctuated, and the heat exchange efficiency of the waste heat recovery device is limited, so that the head-on air speed and the temperature of the NMP waste gas in the surface cooler are also changed. When the NMP waste gas air quantity is smaller than the design air quantity, more cooling water is not needed at the moment, and the maximum valve opening of the cooling water is kept, so that NMP waste gas can not be cooled more effectively, and energy waste can be caused;
(2) The surface cooler is adaptively adjusted along with the current ambient temperature. The change in ambient temperature mainly affects the temperature of the cooling water. Moreover, the chilled water inlet temperature is not necessarily maintained at a constant temperature. Based on the consideration that the cooling water is lower than the chilled water in cost, under the condition of meeting NMP waste gas temperature, the prior art can not realize self-adaptive adjustment of the water quantity of the cooling water and the chilled water, so that the running cost is higher.
Disclosure of Invention
The invention provides a self-adaptive water quantity energy-saving control method based on a surface cooler, which is characterized in that by collecting NMP waste gas data and surface cooler data and combining with preset NMP waste gas outlet temperature, corresponding cooling water and chilled water quantity are calculated under the objective function of the lowest cost operation cost of the surface cooler, and based on the association relation between the cooling water inlet temperature and each calculated variable, the cooling water and chilled water quantity are self-adaptively and accurately adjusted, so that the NMP waste gas can reach the preset working condition requirement after being cooled by the surface cooler, and meanwhile, the operation cost of the surface cooler is reduced.
A self-adaptive water quantity energy-saving control method based on a surface cooler comprises the following steps:
s1: acquiring an NMP waste gas data set and a surface cooler data set, and presetting an NMP waste gas outlet temperature;
S2: dividing the surface cooler into a cooling section and a freezing section, and establishing a heat calculation model by combining the heat transfer coefficient outside the pipe;
s3: comprehensively considering the water consumption of the cooling section and the freezing section and the unit consumption cost thereof, and taking the running cost of the surface cooler as an optimized objective function;
s4: calculating and obtaining the lowest running cost of the surface cooler at the current preset NMP waste gas outlet temperature and the calculated variable values of the cooling section and the freezing section corresponding to the lowest running cost;
s5: based on the variable data obtained by calculation, drawing a related characteristic curve graph of the cooling water inlet temperature and the calculated variables by using drawing software, obtaining a corresponding association relation, and designing regulation and control parameters according to data points corresponding to the association relation so as to adaptively adjust the water quantity of the cooling water and the chilled water.
Through gathering NMP waste gas data, surface cooler data to and combine and predetermine NMP waste gas outlet temperature, with under the objective function of the minimum cost running cost of surface cooler, calculate corresponding cooling water and chilled water yield, and based on cooling water inlet temperature and each calculated variable's association, the accurate cooling water of self-adaptation and chilled water yield, so that NMP waste gas reaches predetermined operating mode requirement after the surface cooler cooling, also reduced the running cost of surface cooler simultaneously.
Further, in the step S1,
the NMP exhaust gas dataset includes: an initial air quantity of NMP waste gas from an outlet of the coating machine and an initial temperature of NMP waste gas from the outlet of the coating machine;
the surface cooler data set comprises a surface cooler structural parameter data set and a surface cooler monitoring parameter data set;
the surface cooler structural parameter dataset comprises: coil outside diameter, coil thickness, coil spacing, fin thickness, surface cooler width, surface cooler height, surface cooler head-on number of tube rows, and fin heat conductivity coefficient;
the surface cooler monitoring parameter data set includes: surface cooler inlet temperature, cooling water inlet temperature, chilled water inlet temperature.
Further, in the step S2, the heat transfer coefficient outside the pipe includes the heat transfer coefficient outside the pipe of the cooling sectionAnd the heat transfer coefficient outside the tube of the freezing section +.>；
Heat transfer coefficient outside the cooling sectionThe method comprises the following steps:
；
heat transfer coefficient outside tube of freezing sectionThe method comprises the following steps:
；
in the formula ,for the heat transfer coefficient outside the cooling section, < ->The heat transfer coefficient outside the tube of the freezing section; />NMP exhaust gas head-on wind speed for cooling section of surface cooler, < ->NMP waste gas head-on wind speed of a freezing section of the surface cooler; />Cooling water flow rate in coil pipe of cooling section of surface cooler, < >>Chilled water flow rate in coil pipe of surface cooler freezing section +. >For the cross-sectional area of the coil in the cooling section, +.>Is the cross-sectional area of the coil in the freezing section; />、/>、/>、/>、/>、/>Are coefficients.
Further, in the step S2, the heat calculation model includes total heat transfer amount of the surface cooler, total heat transfer amount of the cooling section, and total heat transfer amount of the freezing section;
total heat transfer capacity of surface coolerThe calculated expression of (2) is:
；
total heat transfer capacity of cooling sectionThe calculated expression of (2) is:
；
；
total heat transfer capacity of freezing sectionThe calculated expression of (2) is:
；
；
in the formula ,for cooling the heat of the section->Is the heat of the freezing section; />For the average specific heat capacity of the NMP off-gas of the cooling section, < >>The average specific heat capacity of NMP waste gas in the freezing section; />The initial air quantity of NMP waste gas from the outlet of the coater; />For cooling water inlet density of cooling section, +.>The inlet density of chilled water for the freezing section; />For the total heat transfer area outside the cooling section tube, +.>The total heat transfer area outside the freezing section tube; />For the logarithmic mean temperature difference of the cooling section, +.>Log mean temperature difference for frozen sections; />For the NMP exhaust gas inlet temperature of the cooling section, +.>For the NMP off-gas outlet temperature of the cooling section and for the NMP off-gas inlet temperature of the freezing section, +.>The NMP waste gas outlet temperature of the freezing section; />For cooling water inlet temperature of cooling section, +.>For the cooling water outlet temperature of the cooling section, +.>For the chilled water inlet temperature of the freezing section, +. >The outlet temperature of chilled water for the freezing section; />For the fin efficiency of the cooling section, +.>Fin efficiency for the freeze section; />The fin ratio of the fin of the cooling section; />The fin ratio of the fins in the freezing section is;
wherein ,the NMP waste gas has an initial density within a temperature range of 100-140 ℃, and the calculation expression is as follows:
；
in the formula ,is the NMP off-gas initial temperature from the coater outlet.
Further, in the step S3, the water consumption of the cooling section and the freezing section and the unit consumption cost thereof are comprehensively considered, and the running cost of the surface cooler is used as an optimized objective function, which is as follows:
；
in the formula ,the lowest running cost of the surface cooler is achieved; />Cost per unit amount of cooling water for cooling section, < >>The unit dosage cost of the frozen water in the freezing section is set;
wherein ,for the cooling water quantity of the cooling section, the calculation expression is as follows:
；
wherein ,for the chilled water volume of the freezing section, the calculated expression is:
。
further, in the step S4, under the lowest running cost of the surface cooler, the process of obtaining the calculated variable values of the cooling section and the freezing section specifically includes:
s41: obtaining the lowest running cost of the surface coolerUnder this condition, the corresponding cooling water flow rate is obtained>Cooling water outlet temperature->Chilled Water flow Rate- >Chilled water outlet temperature->；
S42: based on chilled water outlet temperatureCalculate the specific heat capacity of chilled water>And re-iterating to correct chilled water flow rate +.>Chilled water outlet temperature->And the corresponding surface cooler minimum operating cost +.>；
S43: the total heat transfer capacity of the surface cooler is calculated by combining with a heat calculation modelThe heat transfer coefficient of the cooling section outside the tube>Heat transfer coefficient outside the tube of the freezing section +.>Fin efficiency of cooling section->Fin efficiency of freezing section->。
An energy-saving control system of self-adaptive water volume based on surface cooler, comprising:
the data acquisition module is used for reading the initial air quantity of NMP waste gas from the outlet of the coating machineNMP off-gas initial temperature from coater outlet +.>NMP exhaust gas inlet temperature of cooling section>NMP waste gas outlet temperature of freezing section>Cooling water inlet temperature of cooling section>Chilled water inlet temperature of freezing section>；
The data storage module is used for storing the data acquired by the data acquisition module;
the data processing module is used for calculating the minimum running cost of the surface cooler and the corresponding cooling water flow rateCooling water outlet temperature->Chilled Water flow Rate->Chilled water outlet temperature->And total heat transfer capacity of the surface cooler>The heat transfer coefficient of the cooling section outside the tube >Heat transfer coefficient outside the tube of the freezing section +.>Fin efficiency of cooling section->Fin efficiency of freezing section->And cooling water inlet flow and chilled water inlet flow; and plotting the cooling water inlet temperature +.>The water quantity of the cooling water inlet and the operation cost of the surface cooler are respectively +.>Chilled Water intake Water amount->NMP exhaust gas outlet temperature->Cooling water outlet temperature->Chilled water outlet temperature->Total heat transfer of surface cooler>The heat transfer coefficient of the cooling section outside the tube>Heat transfer coefficient outside the tube of the freezing section +.>Fin efficiency of cooling section->Fin efficiency of freezing section->Is a correlation characteristic diagram of (1);
and the data execution module is used for carrying out valve regulation and control according to the cooling water consumption and the chilled water consumption and carrying out overtemperature alarm when the NMP outlet temperature is.
A computer device, comprising: a processor, a memory and a bus, the memory storing machine-readable instructions executable by the processor, the processor and the memory in communication over the bus when the computer device is running, the machine-readable instructions when executed by the processor performing the method of any of the above.
A computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the method of any of the preceding claims.
The beneficial effects of the invention are as follows:
according to the invention, through collecting NMP waste gas data, surface cooler data and combining with preset NMP waste gas outlet temperature, corresponding cooling water and chilled water quantity are calculated under the objective function of the lowest cost operation cost of the surface cooler, and based on the association relation between the cooling water inlet temperature and each calculated variable, the cooling water and chilled water quantity are adjusted in a self-adaptive and precise manner, so that the NMP waste gas can reach the preset working condition requirement after being cooled by the surface cooler, and meanwhile, the operation cost of the surface cooler is reduced.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a flow chart of example 2;
FIG. 3 is a graph of cooling water inlet temperature versus calculated variables;
FIG. 4 is a schematic diagram of a self-adaptive water volume energy-saving control system based on a surface cooler;
FIG. 5 is a flow chart of NMP off-gas process;
fig. 6 is a schematic structural diagram of a computer device.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that various aspects of the embodiments are described below within the scope of the following claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present disclosure, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
Furthermore, in the following description, specific details are provided for the purpose of providing a thorough understanding of the examples, and it will be apparent to one skilled in the art that the specific meaning of the terms described above in the present application will be practiced with specificity.
Example 1
The self-adaptive water quantity energy-saving control method based on the surface cooler is shown in fig. 1, and by collecting NMP waste gas data, surface cooler data and combining with preset NMP waste gas outlet temperature, corresponding cooling water and chilled water quantity are calculated under the objective function of the lowest cost operation cost of the surface cooler, and based on the association relation between the cooling water inlet temperature and each calculated variable, the cooling water and chilled water quantity are self-adaptively and accurately adjusted, so that the NMP waste gas can reach the preset working condition requirement after being cooled by the surface cooler, and meanwhile, the operation cost of the surface cooler is also reduced; the method specifically comprises the following steps:
S1: NMP waste gas data and surface cooler data are obtained, and the NMP waste gas outlet temperature is preset;
NMP off-gas data includes: an initial air quantity of NMP waste gas from an outlet of the coating machine and an initial temperature of NMP waste gas from the outlet of the coating machine;
the surface cooler data comprises surface cooler structure parameter data and surface cooler monitoring parameter data;
wherein, the surface cooler structural parameter data includes: coil outside diameter, coil thickness, coil spacing, fin thickness, surface cooler width, surface cooler height, surface cooler head-on number of tube rows, and fin heat conductivity coefficient;
wherein, the surface cooler monitoring parameter data includes: surface cooler inlet temperature, cooling water inlet temperature, chilled water inlet temperature.
S2: dividing the surface cooler into a cooling section and a freezing section, and establishing a heat calculation model by combining the heat transfer coefficient outside the pipe;
external heat transfer coefficient including cooling sectionAnd the heat transfer coefficient outside the tube of the freezing section +.>The method comprises the steps of carrying out a first treatment on the surface of the It is possible to use a linear regression fit,
heat transfer coefficient outside the cooling sectionThe calculated expression of (2) is:
；
heat transfer coefficient outside tube of freezing sectionThe calculated expression of (2) is:
；
in the formula ,for the heat transfer coefficient outside the cooling section, < ->The heat transfer coefficient outside the tube of the freezing section; / >NMP exhaust gas head-on wind speed for cooling section of surface cooler, < ->NMP waste gas head-on wind speed of a freezing section of the surface cooler; />Cooling water flow rate in coil pipe of cooling section of surface cooler, < >>Chilled water flow rate in coil pipe of surface cooler freezing section +.>For the cross-sectional area of the coil in the cooling section, +.>Is the cross-sectional area of the coil in the freezing section; />、/>、/>、/>、/>、/>Are coefficients.
In this embodiment, the data sources required to calculate the out-of-pipe heat transfer coefficients include field acquisition and Ansys Fluent simulation.
The heat calculation model comprises the total heat transfer quantity of the surface cooler, the total heat transfer quantity of the cooling section and the total heat transfer quantity of the freezing section; based on the heat balance relationship and the ideal gas state equation, it is possible to obtain,
total heat transfer capacity of surface coolerThe calculated expression of (2) is:
；
total heat transfer capacity of cooling sectionThe calculated expression of (2) is:
；
；
total heat transfer capacity of freezing sectionThe calculated expression of (2) is:
；
；
in the formula ,for cooling the heat of the section->Is the heat of the freezing section; />For the average specific heat capacity of the NMP off-gas of the cooling section, < >>The average specific heat capacity of NMP waste gas in the freezing section; />The initial air quantity of NMP waste gas from the outlet of the coater; />For the initial density of NMP off-gas, +.>For cooling water inlet density of cooling section, +.>The inlet density of chilled water for the freezing section; />For the total heat transfer area outside the cooling section tube, +. >The total heat transfer area outside the freezing section tube; />For the logarithmic mean temperature difference of the cooling section, +.>Log mean temperature difference for frozen sections; />For the NMP exhaust gas inlet temperature of the cooling section, +.>For the NMP off-gas outlet temperature of the cooling section and for the NMP off-gas inlet temperature of the freezing section, +.>The NMP waste gas outlet temperature of the freezing section; />For cooling water inlet temperature of cooling section, +.>For the cooling water outlet temperature of the cooling section, +.>For the chilled water inlet temperature of the freezing section, +.>The outlet temperature of chilled water for the freezing section; />Fins for cooling sectionsEfficiency (I)>Fin efficiency for the freeze section; />The fin ratio of the fin of the cooling section; />The fin ratio of the fins in the freezing section is;
in this example, the least squares method was used to fit the initial density of NMP off-gas separatelyDensity of water->Specific heat capacity of water->；
Initial Density of NMP off-gasThe calculated expression of (2) is:
；
in the formula ,the initial temperature of NMP waste gas from the outlet of the coating machine is 100-140 ℃.
Wherein the cooling water and the chilled water are in the state of water at different temperatures, namely the water is at different positionsThe lower part of the upper part is provided with a lower part,
density of waterThe calculated expression of (2) is: />；
Specific heat capacity of waterThe calculated expression of (2) is:
；
in the formula ,for cooling water or chilled water at different temperatures, +. >；/>The temperature range of (2) is 0-50 ℃, and in general, the cooling section: />C, freezing: />℃。
Wherein, the average head-on wind speed of NMP waste gas of the cooling sectionThe calculated expression of (2) is:
；
wherein, the average head-on wind speed of NMP waste gas in the freezing sectionThe calculated expression of (2) is:
；
in the formula ,is the windward area of the surface cooler.
S3: comprehensively considering the water consumption of the cooling section and the freezing section and the unit consumption cost thereof, and taking the running cost of the surface cooler as an optimized objective function;
the running cost of the surface cooler is used as an optimized objective function:
；
in the formula ,the lowest running cost of the surface cooler is achieved; />Cost per unit amount of cooling water for cooling section, < >>The unit dosage cost of the frozen water in the freezing section is set;
wherein ,for the cooling water quantity of the cooling section, the calculation expression is as follows:
；
wherein ,for the chilled water volume of the freezing section, the calculated expression is:
；
s4: calculating and obtaining the lowest running cost of the surface cooler at the current preset NMP waste gas outlet temperature and the calculated variable values of the cooling section and the freezing section corresponding to the lowest running cost; the process specifically comprises the following steps:
S41：obtaining the lowest running cost of the surface coolerUnder this condition, the corresponding cooling water flow rate is obtained>Cooling water outlet temperature- >Chilled Water flow Rate->Chilled water outlet temperature->；
S42: based on chilled water outlet temperatureCalculate the specific heat capacity of chilled water>And re-iterating to correct chilled water flow rate +.>Chilled water outlet temperature->And the corresponding surface cooler minimum operating cost +.>；
Wherein the chilled water outlet temperatureLower specific heat capacity->The calculated expression of (2) is:
the cooling water or the chilled water having different temperaturesLower specific heat capacity->The calculated expression of (2) is:
；
in the formula ,for the specific heat capacity of the cooling water>Is the specific heat capacity of cold water.
S43: the total heat transfer capacity of the surface cooler is calculated by combining with a heat calculation modelThe heat transfer coefficient of the cooling section outside the tube>Heat transfer coefficient outside the tube of the freezing section +.>Fin efficiency of cooling section->Fin efficiency of freezing section->。
S5: based on the variable data obtained by calculation, drawing a relevant characteristic curve graph of the cooling water inlet temperature and the calculated variables by using drawing software, and obtaining a corresponding association relation so as to adaptively adjust the water quantity of the cooling water and the chilled water.
The related characteristic curves of the cooling water inlet temperature and each calculated variable comprise the cooling water inlet temperature, the running cost of the surface cooler, the cooling water inlet temperature, the inlet water quantity of cooling water, the cooling water inlet temperature, the outlet temperature of cooling water, chilled water and NMP waste gas, the total heat transfer quantity of the cooling water inlet temperature, the cooling section and the freezing section, the heat transfer coefficient outside the cooling water inlet temperature, the cooling section and the freezing section, and the fin efficiency of the cooling water inlet temperature, the cooling section and the freezing section; through the change of comparison along with cooling water inlet temperature, the change condition of other computational variable, and then the water yield of the self-adaptation adjustment cooling water of being convenient for and freezing water for can guarantee under the condition that freezing section NMP outlet temperature accords with predetermined operating mode, can accurately regulate and control the water yield of cooling water and freezing water, reduced the surface cooler running cost simultaneously.
In the application, NMP waste gas is treated as dry air, and only dry working conditions are considered, and wet working conditions are not considered.
Example 2
As shown in fig. 2, the embodiment provides a self-adaptive water volume energy-saving control method based on a surface air cooler, which specifically includes the following steps:
t1: inputting NMP waste gas data, surface cooler structure data and surface cooler monitoring data, and presetting NMP waste gas outlet temperature;
NMP off-gas data includes: NMP waste gas initial air quantity from coater outletThe method comprises the steps of carrying out a first treatment on the surface of the NMP off-gas initial temperature from coater outlet +.>The method comprises the steps of carrying out a first treatment on the surface of the Average specific heat capacity of NMP exhaust gas of cooling section>The method comprises the steps of carrying out a first treatment on the surface of the Average specific heat capacity of NMP off-gas in the freezing section>；
The surface cooler structure data includes: coil outside diameter, which is 0.01588m; coil thickness, which is 0.0007m; coil spacing, which is 0.0381m; fin pitch, which is 0.00254m; fin thickness, which is 0.00013m; the surface cooler width is 0.4m; the height of the surface cooler is 0.5334m; the length of the surface cooler is 0.338m; the number of the head-on pipes of the surface cooler,10 of them; the number of head-on tube rows of the surface cooler is 10; the heat conductivity coefficient of the fins; cross-sectional area of coil；
The surface cooler monitoring data comprises cooling section monitoring data and freezing section monitoring data;
The cooling section monitoring data includes: NMP exhaust gas inlet temperature of cooling sectionThe method comprises the steps of carrying out a first treatment on the surface of the Cooling water inlet temperature of cooling sectionThe method comprises the steps of carrying out a first treatment on the surface of the Unit cost of cooling Water->A meta-element;
wherein, the outlet temperature of cooling water of the cooling sectionCooling water inlet temperature of cooling section>The temperature difference is not more than->。
The freeze section monitoring data includes: chilled water inlet temperature in the freezing sectionIt is a constant temperature; unit dosage cost of chilled Water>A meta-element;
NMP waste gas preset outlet temperature。
In the monitoring process, the outlet temperature of the cooling water of the cooling section is ensuredCooling water inlet temperature of cooling section>The temperature difference is not more than->The method comprises the steps of carrying out a first treatment on the surface of the NMP exhaust gas preset outlet temperature->Should be less than +.>。
T2: dividing the surface cooler into a cooling section and a freezing section, and establishing a heat calculation model by combining the heat transfer coefficient outside the pipe;
in the embodiment, the coefficient of the heat transfer outside the tube is calculated by adopting a K-value empirical formula、、/>The method comprises the steps of carrying out a first treatment on the surface of the 106 experimental data sets were used and linear regression fitting was performed using the originPro software, and obtained,
heat transfer coefficient outside the cooling sectionThe calculated expression of (2) is:
；
heat transfer coefficient outside tube of freezing sectionThe calculated expression of (2) is:
；
in the formula ,NMP exhaust gas head-on wind speed for cooling section of surface cooler, < ->NMP waste gas head-on wind speed of a freezing section of the surface cooler; / >The flow rate of cooling water in a coil pipe of a cooling section of the surface cooler; the valve opening of the cooling water valve is maximum>；The flow rate of chilled water in the coil pipe of the freezing section of the surface cooler.
The heat calculation model comprises the total heat transfer quantity of the surface cooler, the total heat transfer quantity of the cooling section and the total heat transfer quantity of the freezing section;
total heat transfer capacity of surface coolerThe calculated expression of (2) is:
；
total heat transfer capacity of cooling sectionThe calculated expression of (2) is:
；
；
total heat transfer capacity of freezing sectionThe calculated expression of (2) is:
；
；
in the formula ,for cooling the heat of the section->Is the heat of the freezing section; />For the initial density of NMP off-gas, +.>For cooling water inlet density of cooling section, +.>The inlet density of chilled water for the freezing section; />For the total heat transfer area outside the cooling section tube, +.>The total heat transfer area outside the freezing section tube; />For the logarithmic mean temperature difference of the cooling section, +.>Log mean temperature difference for frozen sections; />For the NMP exhaust gas inlet temperature of the cooling section, +.>For the NMP off-gas outlet temperature of the cooling section and for the NMP off-gas inlet temperature of the freezing section, +.>The NMP waste gas outlet temperature of the freezing section; />For cooling water inlet temperature of cooling section, +.>For the cooling water outlet temperature of the cooling section, +.>For the chilled water inlet temperature of the freezing section, +.>The outlet temperature of chilled water for the freezing section; />For the fin efficiency of the cooling section, +. >Fin efficiency for the freeze section; />The fin ratio of the fin of the cooling section; />The fin ratio of the fins in the freezing section is;
wherein, the initial density of NMP waste gas is within the temperature range of 100-140 DEG CThe computational expression is:
；
in the formula ,is the NMP off-gas initial temperature from the coater outlet.
In the temperature range of 0-50 ℃, the cooling water or the chilled water has different temperaturesDensity->The calculated expression of (2) is:
；
the cooling water or the chilled water having different temperaturesLower specific heat capacity->The calculated expression of (2) is:
。
t3: comprehensively considering the water consumption of the cooling section and the freezing section and the unit consumption cost thereof, and taking the running cost of the surface cooler as an optimized objective function;
the lowest running cost of the surface cooler is used as an optimized objective function:
；
in the formula ,the lowest running cost of the surface cooler is achieved; />Cost per unit amount of cooling water for cooling section, < >>Single freezing water for freezing sectionBit usage cost;
wherein ,for the cooling water quantity of the cooling section, the calculation expression is as follows: />；
wherein ,for the chilled water volume of the freezing section, the calculated expression is: />。
By minimizing the operating costs of the surface chillerAnd carrying out nonlinear limiting target planning, and determining the optimal water quantity of cooling water and chilled water and the lowest running cost of the corresponding surface cooler, thereby realizing optimization.
In the actual operation, the cooling water amount and the chilled water amount should be kept within a margin of 10%.
T4: calculating and obtaining the lowest running cost of the surface cooler at the current preset NMP waste gas outlet temperature and the calculated variable values of the cooling section and the freezing section corresponding to the lowest running cost;
t41: obtaining the lowest running cost of the surface coolerUnder this condition, the corresponding cooling water flow rate is obtained>Cooling water outlet temperature->Chilled Water flow Rate->Chilled water outlet temperature->；
T42: based on chilled water outlet temperatureCalculate the specific heat capacity of chilled water>And re-iterating to correct chilled water flow rate +.>Chilled water outlet temperature->And the corresponding surface cooler minimum operating cost +.>；
T43: the total heat transfer capacity of the surface cooler is calculated by combining with a heat calculation modelThe heat transfer coefficient of the cooling section outside the tube>Heat transfer coefficient outside the tube of the freezing section +.>Fin efficiency of cooling section->Fin efficiency of freezing section->。
In this embodiment, MATLAB software is used to solve for each calculated variable value.
T5: based on the variable data obtained by calculation, drawing a related characteristic curve graph of the cooling water inlet temperature and the calculated variables by using drawing software, obtaining a corresponding association relation, and designing regulation and control parameters according to data points corresponding to the association relation so as to adaptively adjust the water quantity of the cooling water and the chilled water.
As shown in FIG. 3, the cooling water inlet temperature was plotted using OriginPro software based on the calculated variable values obtainedRespectively with the operation cost of the surface cooler>Cooling water inlet quantity->Chilled Water intake Water amount->NMP exhaust gas outlet temperature->Cooling water outlet temperature->Chilled water outlet temperature->Total heat transfer of cooling section->Total heat transfer of freezing section->The heat transfer coefficient of the cooling section outside the tube>Heat transfer coefficient outside the tube of the freezing section +.>Fin efficiency of cooling section->Fin efficiency of freezing section->Is a graph of the correlation characteristics of (a).
As shown in FIG. 3 (a), it can be seen that the inlet temperature of the cooling water is dependent onThe operation cost of the surface cooler is +.>Reduction; that is, in the present embodiment, as the cooling water inlet temperature +.>From->Reduced to->The running cost of the surface air cooler can be reduced by 2 percent;
as shown in FIG. 3 (b), it can be seen that the inlet temperature of the cooling water is dependent onCompared with the cooling water quantity, the cooling water quantity is greatly reduced, namely, the lower the ambient temperature is, the more the cooling water quantity is favorable for reducing the cooling water quantity, and the running cost of the surface cooler is further reduced;
as shown in (c) and (d) of FIG. 3, in the present embodiment, when the cooling water inlet temperature Reduced to->At the time of its exit temperature from the cooling water +.>The temperature difference of (2) is exceeded->And total heat transfer of cooling sectionQuantity->The gradual increase, namely, the cooling section structure of the surface cooler is unfavorable for maintaining the inlet temperature of cooling water; when cooling water inlet temperature->Reduced to->When it is at the chilled water outlet temperature +.>The temperature difference of (2) is exceeded->Total heat transfer of cooling section->The cooling section structure of the surface cooler can continuously maintain the inlet temperature of cooling water when gradually reduced;
as shown in FIG. 3 (e), it can be seen that the inlet temperature of the cooling water is dependent onIs reduced, the inlet temperature of NMP offgas of the freezing section is +.>The temperature difference of (2) becomes smaller, and the heat transfer coefficient of the tube outside of the freezing section is +.>Heat transfer coefficient +.>The reduction amplitude of (2) is larger;
as shown in FIG. 3 (f), it can be seen that the inlet temperature of the cooling water is dependent onIs reduced, fin efficiency of the cooling section +.>Fin efficiency of freezing section->Is not greatly varied.
Example 3
As shown in fig. 4, the embodiment provides a self-adaptive water quantity energy-saving control system based on a surface cooler, which comprises a data acquisition module, a data storage module, a data processing module and a data execution module, wherein the data acquisition module monitors and acquires data of the surface cooler and different stages of NMP waste gas thereof, and after the data acquisition module processes the data, the corresponding cooling water flow rate and freezing water flow rate are acquired based on the lowest running cost of the surface cooler under the condition of presetting the NMP outlet temperature, the consumption of cooling water and freezing water is calculated, and the self-adaptive adjustment of the consumption of cooling water and the consumption of freezing water is realized according to the relation between the cooling water inlet temperature and other calculation variables.
Specifically, the data acquisition module is used for reading the collected NMP waste gas data, the surface cooler monitoring parameter data, the surface cooler structural parameter data and the preset NMP waste gas outlet temperature；
NMP off-gas data includes: NMP waste gas initial air quantity from coater outletNMP off-gas initial temperature from coater outlet +.>NMP exhaust gas inlet temperature of cooling section>；
The surface cooler monitoring parameter data comprises: cooling water inlet temperature of cooling sectionChilled water inlet temperature of freezing section>Chilled water outlet temperature->Lower specific heat capacity->；
The structural parameter data of the surface cooler comprise: coil outside diameter, coil thickness, coil spacing, fin thickness, surface cooler width, surface cooler height, surface cooler head-on number of tube rows, and fin heat conductivity coefficient.
In this embodiment, the NMP exhaust gas data and the data of the monitoring parameter data of the surface cooler are obtained by collecting and obtaining the initial air volume of the NMP exhaust gas from the outlet of the coater by the monitoring device after the NMP exhaust gas passes through the outlet of the coater during the NMP exhaust gas recovery processAnd NMP off-gas initial temperature from coater outlet +.>After waste heat recovery, collecting and obtaining the inlet temperature of NMP waste gas of a cooling section in the surface cooler in sequence >Cooling water inlet temperature in cooling section>And cooling water flow rate->Chilled water inlet temperature in the freezing section>And cooling water flow rate->NMP exhaust gas outlet temperature->Then, carrying out exhaust tail gas treatment; the specific location of the monitoring device arrangement is shown in fig. 5.
In this embodiment, the surface cooler is a condensing host.
Specifically, the data storage module is used for storing the data acquired by the data acquisition module;
specifically, the data processing module is used for calculating and acquiring the lowest running cost of the surface cooler and corresponding calculated variable values, and drawing the cooling water inlet temperatureA correlation characteristic curve with each calculated variable;
the calculated variables include cooling water flow rateCooling water outlet temperature->Chilled Water flow Rate->Chilled water outlet temperature->And total heat transfer capacity of the surface cooler>The heat transfer coefficient of the cooling section outside the tube>Heat transfer coefficient outside the tube of the freezing section +.>Fin efficiency of cooling section->Fin efficiency of freezing section->，
The related characteristic curves of the cooling water inlet temperature and each calculated variable comprise the cooling water inlet temperature, the running cost of the surface cooler, the cooling water inlet temperature, the inlet water quantity of cooling water, the cooling water inlet temperature, the outlet temperature of cooling water, chilled water and NMP waste gas, the total heat transfer quantity of the cooling water inlet temperature, the cooling section and the freezing section, the heat transfer coefficient outside the cooling water inlet temperature, the cooling section and the freezing section, and the fin efficiency of the cooling water inlet temperature, the cooling section and the freezing section.
Specifically, the data execution module is used for performing valve regulation and control according to the cooling water consumption and the chilled water consumption and performing overtemperature alarm when the NMP outlet temperature is reached.
Example 4
Based on the same technical concept, as shown in fig. 6, the present embodiment further provides a computer device corresponding to the method provided in the foregoing embodiment, including a processor 2, a memory 1, and a bus, where the memory stores machine-readable instructions executable by the processor, and when the computer device is running, the processor and the memory communicate through the bus, and the machine-readable instructions are executed by the processor to perform any one of the methods described above.
The memory 1 includes at least one type of readable storage medium including flash memory, a hard disk, a multimedia card, a card type memory (e.g., SD or DX memory, etc.), a magnetic memory, a magnetic disk, an optical disk, etc.
The memory 1 may in some embodiments be an internal storage unit of an adaptive water-volume energy-saving control system based on a surface cooler, such as a hard disk. The memory 1 may in other embodiments also be an external storage device of an adaptive water volume energy saving control system based on a surface cooler, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card) or the like. Further, the memory 1 may also comprise both an internal memory unit and an external memory device of the surface cooler based adaptive water volume energy saving control system. The memory 1 may be used not only for storing application software installed in the surface-cooler-based adaptive water amount energy saving control system and various types of data, for example, codes of the surface-cooler-based adaptive water amount energy saving control system program, etc., but also for temporarily storing data that has been output or is to be output.
The processor 2 may in some embodiments be a central processing unit (Central Processing Unit, CPU), controller, microcontroller, microprocessor or other data processing chip for running program code or processing data stored in the memory 1, for example executing an adaptive water volume energy saving control program based on an air cooler or the like.
The disclosed embodiments also provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method described in the method embodiments above. Wherein the storage medium may be a volatile or nonvolatile computer readable storage medium.
The computer program product for applying the page content refreshing method provided by the embodiment of the present invention includes a computer readable storage medium storing program codes, and the instructions included in the program codes may be used to execute the steps of the method described in the method embodiment, specifically, refer to the method embodiment and are not repeated herein.
The disclosed embodiments also provide a computer program which, when executed by a processor, implements any of the methods of the previous embodiments. The computer program product may be realized in particular by means of hardware, software or a combination thereof. In an alternative embodiment, the computer program product is embodied as a computer storage medium, and in another alternative embodiment, the computer program product is embodied as a software product, such as a software development kit (Software Development Kit, SDK), or the like.
It is to be understood that the same or similar parts in the above embodiments may be referred to each other, and that in some embodiments, the same or similar parts in other embodiments may be referred to.
It should be noted that in the description of the present invention, the terms first, second, and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, unless otherwise indicated, a plurality of meanings means at least two.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (9)
1. The self-adaptive water quantity energy-saving control method based on the surface cooler is characterized by comprising the following steps of:
s1: acquiring an NMP waste gas data set and a surface cooler data set, and presetting an NMP waste gas outlet temperature;
s2: dividing the surface cooler into a cooling section and a freezing section, and establishing a heat calculation model by combining the heat transfer coefficient outside the pipe;
s3: comprehensively considering the water consumption of the cooling section and the freezing section and the unit consumption cost thereof, and taking the running cost of the surface cooler as an optimized objective function;
s4: calculating and obtaining the lowest running cost of the surface cooler at the current preset NMP waste gas outlet temperature and the calculated variable values of the cooling section and the freezing section corresponding to the lowest running cost;
s5: based on the variable data obtained by calculation, drawing a related characteristic curve graph of the cooling water inlet temperature and the calculated variables by using drawing software, obtaining a corresponding association relation, and designing regulation and control parameters according to data points corresponding to the association relation so as to adaptively adjust the water quantity of the cooling water and the chilled water.
2. The energy-saving control method for self-adaptive water amount based on surface cooler according to claim 1, wherein in S1,
the NMP exhaust gas dataset includes: an initial air quantity of NMP waste gas from an outlet of the coating machine and an initial temperature of NMP waste gas from the outlet of the coating machine;
the surface cooler data set comprises a surface cooler structural parameter data set and a surface cooler monitoring parameter data set;
the surface cooler structural parameter dataset comprises: coil outside diameter, coil thickness, coil spacing, fin thickness, surface cooler width, surface cooler height, surface cooler head-on number of tube rows, and fin heat conductivity coefficient;
the surface cooler monitoring parameter data set includes: surface cooler inlet temperature, cooling water inlet temperature, chilled water inlet temperature.
3. The energy-saving control method for self-adaptive water volume based on surface air cooler as set forth in claim 1, wherein in S2, the heat transfer coefficient outside the tube comprises the heat transfer coefficient outside the tube of the cooling sectionAnd the heat transfer coefficient outside the tube of the freezing section +.>；
Heat transfer coefficient outside the cooling sectionThe method comprises the following steps:
；
heat transfer coefficient outside tube of freezing sectionThe method comprises the following steps:
；
in the formula ,for the heat transfer coefficient outside the cooling section, < ->The heat transfer coefficient outside the tube of the freezing section; / >NMP exhaust gas head-on wind speed for cooling section of surface cooler, < ->NMP waste gas head-on wind speed of a freezing section of the surface cooler; />Cooling water flow rate in coil pipe of cooling section of surface cooler, < >>Chilled water flow rate in coil pipe of surface cooler freezing section +.>For the cross-sectional area of the coil in the cooling section, +.>Is the cross-sectional area of the coil in the freezing section; />、/>、/>、/>、/>、/>Are coefficients.
4. The energy-saving control method of self-adaptive water volume based on surface cooler according to claim 3, wherein in S2, the heat calculation model comprises total heat transfer quantity of surface cooler, total heat transfer quantity of cooling section and total heat transfer quantity of freezing section;
total heat transfer capacity of surface coolerThe calculated expression of (2) is:
；
total heat transfer capacity of cooling sectionThe calculated expression of (2) is:
；
；
total heat transfer capacity of freezing sectionThe calculated expression of (2) is:
；
；
in the formula ,for cooling the heat of the section->Is the heat of the freezing section; />For the average specific heat capacity of the NMP off-gas of the cooling section, < >>The average specific heat capacity of NMP waste gas in the freezing section; />The initial air quantity of NMP waste gas from the outlet of the coater; />For cooling water inlet density of cooling section, +.>The inlet density of chilled water for the freezing section; />For the total heat transfer area outside the cooling section tube, +.>The total heat transfer area outside the freezing section tube; />For the logarithmic mean temperature difference of the cooling section, +. >Log mean temperature difference for frozen sections; />For the NMP exhaust gas inlet temperature of the cooling section, +.>For the NMP off-gas outlet temperature of the cooling section and for the NMP off-gas inlet temperature of the freezing section, +.>The NMP waste gas outlet temperature of the freezing section; />For cooling water inlet temperature of cooling section, +.>For the cooling water outlet temperature of the cooling section, +.>For the chilled water inlet temperature of the freezing section, +.>The outlet temperature of chilled water for the freezing section; />For the fin efficiency of the cooling section, +.>Fin efficiency for the freeze section; />For cooling the finsIs a fin ratio of (3); />The fin ratio of the fins in the freezing section is;
wherein ,the NMP waste gas has an initial density within a temperature range of 100-140 ℃, and the calculation expression is as follows:
；
in the formula ,is the NMP off-gas initial temperature from the coater outlet.
5. The energy-saving control method of self-adaptive water volume based on surface cooler according to claim 4, wherein in S3, the water volume used by the cooling section and the freezing section and the unit consumption cost thereof are comprehensively considered, and the running cost of the surface cooler is taken as an optimized objective function, which is:
；
in the formula ,the lowest running cost of the surface cooler is achieved; />Cost per unit amount of cooling water for cooling section, < >>The unit dosage cost of the frozen water in the freezing section is set;
wherein ,for the cooling water quantity of the cooling section, the calculation expression is as follows:
；
wherein ,for the chilled water volume of the freezing section, the calculated expression is:
。
6. the energy-saving control method for self-adaptive water volume based on surface cooler according to claim 1, wherein in S4, the process of obtaining the calculated variable values of the cooling section and the freezing section under the lowest running cost of the surface cooler specifically comprises:
s41: obtaining the lowest running cost of the surface coolerUnder this condition, the corresponding cooling water flow rate is obtained>Outlet temperature of cooling waterChilled Water flow Rate->Chilled water outlet temperature->；
S42: based on chilled water outlet temperatureCalculate the specific heat capacity of chilled water>And re-iterating to correct chilled water flow rateChilled water outlet temperature->And the corresponding surface cooler minimum operating cost +.>；
S43: the total heat transfer capacity of the surface cooler is calculated by combining with a heat calculation modelThe heat transfer coefficient of the cooling section outside the tube>Heat transfer coefficient outside the tube of the freezing section +.>Fin efficiency of cooling section->Fin efficiency of freezing section->。
7. A system adapted for the surface cooler based adaptive water volume energy saving control method of claim 6, comprising:
the data acquisition module is used for reading the initial air quantity of NMP waste gas from the outlet of the coating machine NM exiting from coaterP exhaust gas initial temperature->NMP exhaust gas inlet temperature of cooling section>NMP waste gas outlet temperature of freezing section>Cooling water inlet temperature of cooling section>Chilled water inlet temperature of freezing section>；
The data storage module is used for storing the data acquired by the data acquisition module;
the data processing module is used for calculating the minimum running cost of the surface cooler and the corresponding cooling water flow rateCooling water outlet temperature->Chilled Water flow Rate->Chilled water outlet temperature->And total heat transfer capacity of the surface cooler>The heat transfer coefficient of the cooling section outside the tube>Heat transfer coefficient outside the tube of the freezing section +.>Fin efficiency of cooling section->Fin efficiency of freezing section->And cooling water inlet flow and chilled water inlet flow; and plotting the cooling water inlet temperature +.>The water quantity of the cooling water inlet and the operation cost of the surface cooler are respectively +.>Chilled Water intake Water amount->NMP exhaust gas outlet temperature->Cooling water outlet temperature->Chilled water outlet temperature->Total heat transfer of surface cooler>The heat transfer coefficient of the cooling section outside the tube>Heat transfer coefficient outside the tube of the freezing section +.>Fin efficiency of cooling section->Fin efficiency of freezing section->Is a correlation characteristic diagram of (1);
and the data execution module is used for carrying out valve regulation and control according to the cooling water consumption and the chilled water consumption and carrying out overtemperature alarm when the NMP outlet temperature is.
8. A computer device, comprising: a processor, a memory and a bus, the memory storing machine-readable instructions executable by the processor, the processor and the memory in communication over the bus when the computer device is running, the machine-readable instructions when executed by the processor performing the method of any one of claims 1 to 6.
9. A computer-readable storage medium, characterized in that it has stored thereon a computer program which, when executed by a processor, performs the method according to any of claims 1 to 6.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011169588A (en) * | 2011-06-06 | 2011-09-01 | Toshiba Corp | Air conditioning optimal control system |
| CN102483251A (en) * | 2009-07-23 | 2012-05-30 | W·G·A·道斯 | Redundant Cooling Method And System |
| JP2012184864A (en) * | 2011-03-03 | 2012-09-27 | Fuji Electric Co Ltd | Air conditioning system, control device of the same, and program |
| CN110848840A (en) * | 2019-11-06 | 2020-02-28 | 珠海新源热力有限公司 | Regional cooling system and water supply temperature optimization method |
| CN112902727A (en) * | 2021-03-12 | 2021-06-04 | 曾兰 | Energy saving and consumption reduction NMP recovery system |
-
2023
- 2023-07-27 CN CN202310931376.3A patent/CN116642365B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102483251A (en) * | 2009-07-23 | 2012-05-30 | W·G·A·道斯 | Redundant Cooling Method And System |
| JP2012184864A (en) * | 2011-03-03 | 2012-09-27 | Fuji Electric Co Ltd | Air conditioning system, control device of the same, and program |
| JP2011169588A (en) * | 2011-06-06 | 2011-09-01 | Toshiba Corp | Air conditioning optimal control system |
| CN110848840A (en) * | 2019-11-06 | 2020-02-28 | 珠海新源热力有限公司 | Regional cooling system and water supply temperature optimization method |
| CN112902727A (en) * | 2021-03-12 | 2021-06-04 | 曾兰 | Energy saving and consumption reduction NMP recovery system |
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