CN115900012A - Multistage air treatment method and equipment for realizing ultrahigh-precision control - Google Patents
Multistage air treatment method and equipment for realizing ultrahigh-precision control Download PDFInfo
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Abstract
The invention discloses a multistage air processing method and equipment for realizing ultrahigh precision control, belonging to the field of heating ventilation air conditioners, wherein the equipment comprises a shell, wherein an air mixing section, a dehumidifying surface cooler, a deep dehumidifying surface cooler, an electric heater, a secondary air mixing section, a temperature control surface cooler, a high-precision electric heater and an air supply section are sequentially connected in the shell from one side to the other side through pipelines; the air mixing device is characterized in that the output end of the air supply section is connected with an air supply outlet of an air-conditioning room through an air supply pipeline, the air return inlet of the air-conditioning room is connected with the air return inlet of the air mixing section and the secondary air mixing section through an air return pipeline, a first air quantity regulating valve is arranged on the fresh air inlet of the air mixing section, a second air quantity regulating valve is arranged on the air return inlet of the air mixing section, and a third air quantity regulating valve is arranged on the air return inlet of the secondary air mixing section. The invention can realize accurate control on the premise of energy saving.
Description
Technical Field
The invention relates to the technical field of heating ventilation air conditioners, in particular to a multi-stage air processing method and equipment for realizing ultrahigh-precision control.
Background
With the development of science and technology, places with special process requirements such as laboratories, operating rooms, clean plants and the like have higher and higher requirements on the control precision of room temperature and humidity. The room with the temperature fluctuation range less than or equal to +/-0.5 ℃ and the relative humidity precision less than or equal to +/-5 percent is called a high-precision control room; in some synchrotron radiation light source laboratories and free particle laboratories, some rooms require a temperature fluctuation range of less than or equal to +/-0.1 ℃ and a relative humidity precision of less than or equal to +/-2.5%.
At present, a plurality of paths for realizing air treatment are provided, and each manufacturer also has different function section combination modules, so that equipment formed by combining different function sections can be provided according to the requirements of customers to adapt to the equipment; however, automatic control systems adapted to air handling equipment often require additional autonomous integrators to provide, lacking an overall solution; the final result is that the control logic is not right, the control precision is not enough, the sensor feedback is not in place and the like during field debugging, and the aim of precise control cannot be achieved. Under the background, how to realize accurate control on the premise of energy saving is a difficult problem to be solved at present. Accordingly, those skilled in the art have provided a multi-stage air treatment method and apparatus that achieves ultra-high precision control to solve the problems set forth in the background art described above.
Disclosure of Invention
The invention aims to provide a multistage air treatment method and equipment for realizing ultrahigh-precision control, which can realize precise control on the premise of energy conservation so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a multi-stage air treatment device for realizing ultrahigh precision control comprises a shell, wherein an air mixing section, a dehumidifying surface cooler, a deep dehumidifying surface cooler, an electric heater, a secondary air mixing section, a temperature control surface cooler, a high-precision electric heater and an air supply section are sequentially connected with the inside of the shell from one side to the other side through pipelines, a unit intelligent control cabinet is further arranged inside the shell, and the unit intelligent control cabinet realizes multivariable neural network control by adopting a PLC (programmable logic controller); the air mixing device is characterized in that the output end of the air supply section is connected with an air supply outlet of an air-conditioning room through an air supply pipeline, the air return inlet of the air-conditioning room is connected with the air return inlet of the air mixing section and the secondary air mixing section through an air return pipeline, a first air quantity regulating valve is arranged on the fresh air inlet of the air mixing section, a second air quantity regulating valve is arranged on the air return inlet of the air mixing section, and a third air quantity regulating valve is arranged on the air return inlet of the secondary air mixing section.
As a still further scheme of the invention: and a first waterway proportional-integral valve, a second waterway proportional-integral valve and a third waterway proportional-integral valve are respectively arranged on the dehumidification surface air cooler, the deep dehumidification surface air cooler and the temperature control surface air cooler.
As a still further scheme of the invention: the pipeline is provided with a dew point temperature sensor, a temperature and humidity sensor, a high-temperature circuit breaker, a temperature sensor and a differential pressure sensor, and the air supply pipeline and the air return pipeline are provided with a temperature and humidity sensor, an air quantity sensor and a CO2 concentration sensor.
As a still further scheme of the invention: and a fan section and a medium and high-efficiency filtering section are arranged between the temperature-controlled surface cooler and the high-precision electric heater, and the fan section is positioned between the temperature-controlled surface cooler and the medium and high-efficiency filtering section.
As a still further scheme of the invention: the fan section is internally provided with a digital EC fan.
As a still further scheme of the invention: and a primary filtering section is arranged between the air mixing section and the dehumidifying surface air cooler.
As a still further scheme of the invention: an electric heating humidifier is arranged between the electric heater and the secondary air mixing section.
As a still further scheme of the invention: dehumidification surface cooler all adopts low temperature refrigerated water with degree of depth dehumidification surface cooler, accuse temperature surface cooler adopts high temperature refrigerated water.
The application also discloses a multistage air treatment method for realizing ultrahigh precision control, which is adopted by the multistage air treatment equipment for realizing ultrahigh precision control, and the multistage air treatment method comprises the following steps:
mixing fresh air and return air in an air mixing section;
after mixing, surface cooling and dehumidification are carried out in a dehumidification surface air cooler;
deep cooling and dehumidifying in a deep dehumidification surface air cooler;
reheating in an electric heater;
mixing air in the secondary air mixing section;
carrying out moderate-humidity cooling in a temperature-controlled surface cooler;
detecting the temperature of the air supply, and if the temperature is lower than a preset value, heating the air supply in a high-precision electric heater and then sending the air supply out;
the intelligent control cabinet of the unit adopts a PLC to realize the process of controlling the steps by a multivariable neural network.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention realizes the electromechanical integration of control and air treatment equipment through the intelligent control cabinet of the unit, reduces manual errors and construction and installation errors, and the intelligent control cabinet of the unit adopts a PLC to realize multivariable neural network control, thereby effectively improving the control precision and reliability.
2. The multistage air treatment mode can adjust the proportion of primary return air and secondary return air, reduce the amount of reheated air after dehumidification as much as possible, correspondingly reduce the amount of reheated air, achieve the aim of energy saving, and finally realize accurate control on the premise of energy saving.
3. The surface cooling mode of the invention is freezing water type, and compared with direct expansion type refrigerant surface cooling, the temperature fluctuation of freezing water is less influenced by the environment; the chilled water inlet is adjusted by proportional integral, and the adjusting precision is higher relative to the refrigerant variable flow rate adjustment.
4. The invention has the characteristic of independent temperature and humidity control, and the dehumidification surface cooler adopts low-temperature chilled water for dehumidification, thereby ensuring the dehumidification capability of the system; the temperature control surface cooler adopts high-temperature chilled water, so that the condensation phenomenon is not generated and the humidity control is not influenced while the temperature control is ensured.
5. The heater adopts electric heating, and meets the use requirement of the specification when the process requirement temperature control precision is less than 0.5 ℃.
6. The humidifier adopts a high-precision electric heating type humidifier and silicon controlled linear regulation control, can receive a 0-10V/4-20mA humidification control signal, has double humidity control and pulse water supplementing functions, and ensures the humidification quantity control precision.
7. The digital EC fan can realize stepless regulation of the air quantity from 10 to 100 percent, regulate the air supply quantity according to actual requirements and reduce the energy consumption of the air conditioner fan.
Drawings
FIG. 1 is a schematic structural view of a multi-stage air treatment apparatus for achieving ultra-high precision control;
FIG. 2 is a control schematic diagram of a multi-stage air treatment apparatus implementing ultra-high precision control;
FIG. 3 is a PLC control logic diagram of a multi-stage air treatment device implementing ultra-high precision control;
FIG. 4 is a schematic diagram of the present application converting a PLC control system into a multivariable neural network;
FIG. 5 is a schematic modeling diagram of a PLC control system according to the present application;
FIG. 6 is a graph of the results of the PID multivariable neural network control of the present application;
FIG. 7 is a graph of error results for PID multivariable neural network control of the present application;
FIG. 8 is a diagram illustrating a summer load calculation result in the first embodiment of the present application;
figure 9 is a diagram of a process for enthalpy map processing in an embodiment of the present application.
In the figure: A. a housing; 1. a wind mixing section; 2. a primary filtering section; 3. a dehumidifying surface air cooler; 4. deeply dehumidifying the surface air cooler; 5. an electric heater; 6. an electric heating humidifier; 7. a secondary air mixing section; 8. controlling the temperature of the surface air cooler; 9. a fan section; 10. medium and high efficiency filtering section; 11. a high precision electric heater; 12. an air supply section; 13. an intelligent control cabinet of the unit; 21. a first air volume adjusting valve; 22. a second air volume adjusting valve; 23. a third air volume adjusting valve; 31. a first water path proportional-integral valve; 32. a second water path proportional-integral valve; 33. and a third water path proportional-integral valve.
Detailed Description
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
As mentioned in the background of the present application, for the air treatment equipment in the prior art, it needs to work with an adaptive automatic control system, and this automatic control system often needs to be provided by another automatic control integrator, which easily results in the whole air treatment equipment lacking an overall solution; the final result is that the control logic is not right, the control precision is not enough, the sensor feedback is not in place and the like during field debugging, and the aim of precise control cannot be achieved. How to realize accurate control on the premise of energy saving is a problem to be solved.
In order to solve the problems, the application discloses a multistage air treatment method and equipment for realizing ultrahigh precision control, electromechanical integration of control and air treatment equipment is realized through a unit intelligent control cabinet 13, manual errors and construction installation errors are reduced, and multivariable neural network control of the unit intelligent control cabinet 13 is realized by adopting a PLC (programmable logic controller) so that the control precision and reliability can be effectively improved. In addition, the multistage air treatment mode of this application can adjust the proportion of primary return air and secondary return air, and the reheat air volume after the minimize dehumidification correspondingly reduces the reheat, reaches energy-conserving purpose. And finally, accurate control can be realized on the premise of energy conservation.
How the solution of the present application solves the above technical problem will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1 to 9, in the embodiment of the present invention, a multi-stage air processing device for implementing ultra-high precision control includes a casing a, the inside of the casing a is sequentially connected with an air mixing section 1, a dehumidifying surface cooler 3, a deep dehumidifying surface cooler 4, an electric heater 5, a secondary air mixing section 7, a temperature control surface cooler 8, a high-precision electric heater 11, and an air supply section 12 from one side to the other side through a pipeline, an intelligent control cabinet 13 of a unit is further disposed inside the casing a, and the intelligent control cabinet 13 of the unit implements multivariable neural network control by using a PLC; the output end of the air supply section 12 is connected with an air supply outlet of an air-conditioning room through an air supply pipeline, an air return inlet of the air-conditioning room is connected with air return inlets of the air mixing section 1 and the secondary air mixing section 7 through an air return pipeline, a first air volume adjusting valve 21 is arranged on a fresh air inlet of the air mixing section 1, a second air volume adjusting valve 22 is arranged on an air return inlet of the air mixing section 1, and a third air volume adjusting valve 23 is arranged on an air return inlet of the secondary air mixing section 7. The unit intelligent control cabinet 13 of the application adopts a PLC to realize multivariable neural network control, and it should be noted that, because the controlled elements of the multistage air treatment equipment are more and more complex, the requirements on the control system are quite high, especially the control system is required to be capable of adapting to uncertainty and time-varying objects and environments, the traditional control method based on an accurate model is difficult to adapt to requirements, the concept of the existing dry control is more extensive, the requirements include some decision making, planning and learning functions, and the multivariable neural network meets the requirements. The multivariate neural network is a network formed by widely interconnecting a large number of artificial neurons (processing units), is provided on the basis of the research of modern neurobiology and cognitive science on human information processing, and has strong adaptivity, learning capability, nonlinear mapping capability robustness and fault-tolerant capability. The characteristics of the neural network are fully applied to the control field, and the intellectualization of the control system can be greatly advanced.
In this embodiment: the dehumidification surface air cooler 3, the deep dehumidification surface air cooler 4 and the temperature control surface air cooler 8 are respectively provided with a first water path proportional-integral valve 31, a second water path proportional-integral valve 32 and a third water path proportional-integral valve 33. The surface cooling mode of the invention is freezing water type, and compared with direct expansion type refrigerant surface cooling, the temperature fluctuation of freezing water is less influenced by the environment; the chilled water inlet is adjusted by proportional integral, and the adjusting precision is higher relative to the refrigerant variable flow rate adjustment.
In this embodiment: a fan section 9 and a medium and high-efficiency filtering section 10 are arranged between the temperature-controlled surface cooler 8 and the high-precision electric heater 11, and the fan section 9 is positioned between the temperature-controlled surface cooler 8 and the medium and high-efficiency filtering section 10. The medium and high-efficiency filtering section 10 can effectively filter the air sent by the fan section 9 to remove impurities and particles in the air. And setting the air temperature behind the temperature-controlled surface cooler 8 according to the indoor temperature, and adjusting the opening of the third waterway proportional-integral valve 33 to ensure that the air temperature behind the temperature-controlled surface cooler 8 reaches a set value.
In this embodiment: the fan section 9 is internally provided with a digital EC fan. The digitalized EC fan is subjected to stepless regulation according to the set air output and the actually measured air output of the air output sensor, so that the air output can reach the set requirement. The digital EC fan can realize stepless regulation of the air quantity from 10% to 100%, regulate the air supply quantity according to actual requirements and reduce the energy consumption of the air conditioner fan.
In this embodiment: the pipeline is provided with a dew point temperature sensor, a temperature and humidity sensor, a high-temperature circuit breaker, a temperature sensor and a pressure difference sensor, and the air supply pipeline and the air return pipeline are provided with a temperature and humidity sensor, an air quantity sensor and a CO2 concentration sensor. All sensor signals of this application all insert in unit intelligent control cabinet 13, behind unit intelligent control cabinet 13 collection sensor signal, through multistage air treatment and intelligent control, equipment air supply temperature, humidity can accurate control, and indoor temperature fluctuation degree is steerable within +/-0.5 ℃, and relative humidity fluctuation degree control is within +/-5%. Specifically, the unit intelligent control cabinet 13 adopts a PLC to realize multivariable neural network control according to the received sensor signal, intelligently adjusts the openings of the first air volume adjusting valve 21, the second air volume adjusting valve 22, the third air volume adjusting valve 23, the first water path proportional-integral valve 31, the second water path proportional-integral valve 32 and the third water path proportional-integral valve 33, and intelligently adjusts the heating amounts of the electric heater 5 and the high-precision electric heater 11; intelligently adjusting the humidification quantity of the electric heating humidifier 6; the air supply quantity of the digital EC fan is adjusted in an electrodeless way. And finally, adjusting the high-precision electric heater 11 according to the indoor temperature, and controlling the indoor temperature to meet the design requirement. The control principle of the multi-stage air treatment equipment is shown in fig. 2, wherein in fig. 2, TH indicates a temperature and humidity sensor, Δ P indicates a differential pressure sensor, td indicates a dew point temperature sensor, HC indicates a high temperature circuit breaker, T indicates a temperature sensor, CO2 indicates a CO2 concentration sensor, and L indicates an air volume sensor.
In this embodiment: the opening degree of the first air volume adjusting valve 21 is adjusted according to the CO2 concentration of the room, and the opening degree of the second air volume adjusting valve 22 is adjusted according to the indoor moisture content of the room (determined by actual measurement of a room temperature and humidity sensor). The opening degree of the third air volume adjusting valve 23 is adjusted according to the opening degree of the first air volume adjusting valve 21, the opening degree of the second air volume adjusting valve 22 and the set air volume. Dew point temperatures Td1 and Td2 after the dehumidification surface air cooler 3 and the deep dehumidification surface air cooler 4 are set according to the opening degree of the first air volume adjusting valve 21, the opening degree of the second air volume adjusting valve 22 and the moisture content in the room (generally, td1= Td2 is set); and then the openings of the first waterway proportional-integral valve 31 and the second waterway proportional-integral valve 32 are adjusted through multivariate neural network calculation according to the deviation between the actually measured value and the set value fed back by the dew point temperature sensors after the dehumidification surface air cooler 3 and the deep dehumidification surface air cooler 4. When the dew point temperature Td1 after the surface air cooler 3 is dehumidified reaches the set requirement, the second water path proportional integral valve 32 is closed.
In this embodiment: a primary effect filtering section 2 is arranged between the air mixing section 1 and the dehumidifying surface air cooler 3. The primary filter section 2 can filter the air sent by the air mixing section 1 to remove larger impurities in the air.
In this embodiment: an electric heating humidifier 6 is arranged between the electric heater 5 and the secondary air mixing section 7. The heater adopts electric heating, and meets the use requirement of the specification on the process requirement when the temperature control precision is less than 0.5 ℃. The heating amount of the electric heater 5 is adjusted according to the dew point temperature Td2 after the deep dehumidification surface air cooler 4 and the room dew point temperature (which is determined by the room temperature and humidity sensor), so that the dew point temperature of the air reheated by the electric heater 5 is higher than the room dew point temperature by more than 0.5 ℃. The humidification quantity of the electric heating humidifier 6 is adjusted according to the moisture content in the room chamber.
In this embodiment: the humidifier (namely the electric heating humidifier 6) adopts a high-precision electric heating type humidifier, adopts silicon controlled linear regulation control, can receive a 0-10V/4-20mA humidification control signal, has double humidity control and pulse water replenishing functions, and ensures the control precision of the humidification quantity.
In this embodiment: the dehumidification surface air cooler 3 and the deep dehumidification surface air cooler 4 both adopt low-temperature chilled water, and the temperature control surface air cooler 8 adopts high-temperature chilled water. The invention has the characteristic of independent temperature and humidity control, and the dehumidification surface air cooler 3 adopts low-temperature chilled water for dehumidification, thereby ensuring the dehumidification capability of the system; the temperature control surface cooler 8 adopts high-temperature chilled water, so that the condensation phenomenon is avoided and the humidity control is not influenced while the temperature control is ensured.
In this embodiment: the specific steps of the intelligent control cabinet 13 of the unit for realizing multivariable neural network control by adopting the PLC are as follows:
the PLC control system is converted into a multivariable neural network as shown in fig. 4, in which,
X 11 ，X 21 ，X 31 is a control target of a PLC system control quantity, X 12 ，X 22 ，X 32 Is the current value of the PLC system control quantity, Y 1 ，Y 2 ，Y 3 Is a calculated control law, ω ij And ω jk Is the network weight.
An input layer: output data x si Equal to the input data:
X si :x si (k)＝X si (k)；
hidden layer: input values are as follows:
proportional neuron:
u s1 ＝1.5Neural s1 (k)
an integrating neuron:
u s2 ＝0.9Neural s2 (k)+0.9Neural s2 (k-1)
differential neurons:
u s3 ＝0.3Neural s3 (k)-0.3Neural s3 (k-1)
an output layer:
and (3) error calculation:
wherein n =3 is the number of output nodes, y h (k) For prediction output, r (k) is the control target.
Output layer to hidden layer:
input layer to output layer:
where eta is the learning rate, eta 1 ＝0.007，η 2 ＝0.002，η 3 ＝0.000003。
Transfer function difference equation of PLC control system as follows
Modeling of the system, as shown in FIG. 5, wherein
X 11 ，X 21 ，X 31 Is a control target of a PLC system control quantity, X 12 ，X 22 ，X 32 Is the current value of the PLC system control quantity, Y 1 ，Y 2 ，Y 3 Is the calculated control law, and the initial value of the control quantity [0,0,0 ]]The control target is [0.72,0.38,0.61]The control time interval is 0.001s.
Finally, a result of PID multivariable neural network control (shown in figure 6) and a control error result (shown in figure 7) are obtained, and it is obvious that the control precision of the PID multivariable neural network control is high and the error is small.
The application also discloses a multistage air treatment method for realizing ultrahigh precision control, which is adopted by the multistage air treatment equipment for realizing ultrahigh precision control, and the multistage air treatment method comprises the following steps:
mixing fresh air and return air in the air mixing section 1;
after air mixing, surface cooling and dehumidification are carried out in a dehumidification surface air cooler 3;
deep cooling and dehumidification are carried out in a deep dehumidification surface air cooler 4;
reheating in the electric heater 5;
mixing air in the secondary air mixing section 7;
carrying out moderate-humidity cooling in a temperature-controlled surface cooler 8;
detecting the temperature of the air supply, and if the temperature is lower than a preset value, heating the air supply in the high-precision electric heater 11 and then sending the air supply out;
the unit intelligent control cabinet 13 adopts a PLC to realize the process of controlling the steps by a multivariable neural network.
In order to further illustrate the present invention, a multi-stage air processing method and apparatus for achieving ultra-high precision control according to the present invention will be described in detail with reference to the following embodiments.
Example one
Shenzhen Guangming scientific city significant scientific research project, total building area 32127m 2 The main function of the building is a scientific research room and a complete set thereof, the project is divided into two buildings B1 and B2, the total number of the two buildings is six, and the building height is 33.5 meters. One to four layers of B1 are a synchrotron radiation light source laboratory and a free laser electronic laboratory, one to five layers of B2 are an accurate medical image laboratory and a special environment substance laboratory, and the rest areas are auxiliary supporting offices.
B1, 10 laboratories in the field need to meet the high-precision control requirement, and two sets of central air-conditioning water systems are arranged, wherein the temperature of low-temperature water supply and return water is 2 ℃ \\ 7 ℃; the temperature of the high-temperature water supply and return water is 15 deg.C \\ 20 deg.C. Wherein the building area of the ultrafast laser laboratory is 145 square meters, and the net height under the suspended ceiling is 2.6 meters; the indoor temperature and humidity requirements are as follows: 23 plus or minus 0.2 ℃,37.5 plus or minus 2.5 percent and the cleanliness class ISO 6 grade. The air treatment plant parameters of the present invention were selected by psychrometric chart calculation analysis. The summer load calculation results are shown in fig. 8.
According to the air supply quantity meeting the clean requirement and the air supply quantity determined according to the air supply temperature difference (2.5 ℃) and knowing that the air supply quantity is 36000m 3 H; 1800m of primary return air quantity 3 The enthalpy diagram treatment process is shown in figure 9. Wherein:
the method comprises the following steps: mixing fresh air and return air in the air mixing section 1, wherein the fresh air quantity and the primary return air quantity are both 1800m 3 The dry bulb temperature after air mixing is 28.3 ℃, and the dew point temperature is 18.7 ℃;
step two: after air mixing, surface cooling and dehumidification are carried out in a dehumidification surface air cooler 3, the dry bulb temperature after surface cooling is 8.5 ℃, the dew point temperature is 7.7 ℃, and the cooling load of the surface air cooler is 46kW;
step three: deeply performing surface cooling dehumidification in a surface cooler 4, wherein the dry bulb temperature after surface cooling is 7 ℃, the dew point temperature is 6.2 ℃, and the cooling load of the surface cooler is 4.0kW;
step four: reheating in the electric heater 5, because the air temperature (7 ℃) after surface cooling is lower than the indoor air dew point temperature (7.7 ℃), in order to prevent the condensation after the condensation is mixed with the secondary return air, reheating to be higher than the indoor dew point temperature by more than 1 ℃ and then mixing with the secondary return air; the reheating temperature of the dried ball is 9 ℃, the dew point temperature is 6.2 ℃, and the reheating amount is 2.5kW; after the treatment of the fourth step, the fresh air humidity load and the indoor humidity load are all treated, and humidification is not needed; if the dew point temperature is detected to be lower than 6.2 ℃ in the operation process, the electric heating humidifier 6 is required to be humidified, the humidified air dry bulb temperature is ensured to be 9 ℃, and the relative humidity is 83 +/-2.5%.
Step five: mixing air in the secondary air mixing section 7, wherein the primary air quantity is 3600m 3 H, the secondary air return quantity is 32400m 3 H, the dry bulb temperature after mixing is 21.5 ℃, and the dew point temperature is 7.6 ℃;
step six: the temperature is reduced in a temperature-controlled surface cooler 8 under moderate humidity, and the air quantity is 36000m 3 The dry bulb temperature after surface cooling is 20.5 ℃, the dew point temperature is 7.6 ℃, and the cooling load is 12.5kW;
step seven: after the processing of the sixth step, if the temperature of the supplied air is detected to be lower than 20.5 ℃, the high-precision electric heater 11 needs to be heated and finely adjusted to ensure that the fluctuation range of the indoor temperature is 23 +/-0.2 ℃ and the fluctuation range of the relative humidity is 37.5 +/-2.5%.
Step eight: the unit intelligent control cabinet 13 adopts a PLC to realize the process of controlling the steps by a multivariable neural network.
The total air volume of the whole treatment process under the design working condition is 36000m 3 The total refrigerating capacity of the surface cooler is 62kW, the reheating capacity is 2.5kW, and the effective refrigerating capacity is 59.5kW. The process requirement is met, the reheat is less than 5%, and the energy-saving performance is better.
The invention realizes the electromechanical integration of control and air treatment equipment through the unit intelligent control cabinet 13, reduces manual errors and construction installation errors, and the unit intelligent control cabinet 13 adopts PLC to realize multivariable neural network control, thereby effectively improving the control precision and reliability. The multistage air treatment mode can adjust the proportion of primary return air and secondary return air, and the amount of reheated air after dehumidification is reduced as far as possible, and the corresponding amount of reheat that reduces reaches energy-conserving purpose, can realize accurate control finally under energy-conserving prerequisite. The surface cooling mode of the invention is freezing water type, and compared with direct expansion type refrigerant surface cooling, the temperature fluctuation of freezing water is less influenced by the environment; the chilled water inlet is adjusted by proportional integral, and the adjustment precision is higher compared with the refrigerant variable flow adjustment. The invention has the characteristic of independent temperature and humidity control, and the dehumidification surface air cooler 3 adopts low-temperature chilled water for dehumidification, thereby ensuring the dehumidification capability of the system; the temperature control surface cooler 8 adopts high-temperature chilled water, so that the condensation phenomenon is avoided and the humidity control is not influenced while the temperature control is ensured. The heater adopts electric heating, and meets the use requirement of the specification when the process requirement temperature control precision is less than 0.5 ℃. The humidifier adopts a high-precision electric heating type humidifier and silicon controlled linear regulation control, can receive a 0-10V/4-20mA humidification control signal, has double humidity control and pulse water supplementing functions, and ensures the humidification quantity control precision. The digital EC fan can realize stepless regulation of the air quantity from 10 to 100 percent, regulate the air supply quantity according to actual requirements and reduce the energy consumption of the air conditioner fan.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (9)
1. A multi-stage air treatment device for realizing ultrahigh precision control is characterized by comprising a shell, wherein an air mixing section, a dehumidifying surface cooler, a deep dehumidifying surface cooler, an electric heater, a secondary air mixing section, a temperature control surface cooler, a high-precision electric heater and an air supply section are sequentially connected in the shell from one side to the other side through pipelines;
the air mixing device is characterized in that the output end of the air supply section is connected with an air supply outlet of an air-conditioning room through an air supply pipeline, the air return inlet of the air-conditioning room is connected with the air return inlet of the air mixing section and the secondary air mixing section through an air return pipeline, a first air quantity regulating valve is arranged on the fresh air inlet of the air mixing section, a second air quantity regulating valve is arranged on the air return inlet of the air mixing section, and a third air quantity regulating valve is arranged on the air return inlet of the secondary air mixing section.
2. The multistage air treatment equipment for realizing ultrahigh precision control according to claim 1, wherein a first waterway proportional-integral valve, a second waterway proportional-integral valve and a third waterway proportional-integral valve are respectively arranged on the dehumidification surface air cooler, the deep dehumidification surface air cooler and the temperature control surface air cooler.
3. The multistage air treatment equipment for realizing ultrahigh precision control according to claim 2, wherein the pipeline is provided with a dew point temperature sensor, a temperature and humidity sensor, a high temperature circuit breaker, a temperature sensor and a pressure difference sensor, and the air supply pipeline and the air return pipeline are provided with a temperature and humidity sensor, an air volume sensor and a CO2 concentration sensor.
4. The multistage air treatment equipment for realizing ultrahigh precision control according to claim 1, wherein a fan section and a medium and high efficiency filter section are arranged between the temperature control surface air cooler and the high precision electric heater, and the fan section is positioned between the temperature control surface air cooler and the medium and high efficiency filter section.
5. The multistage air treatment device for achieving ultra-high precision control according to claim 4, wherein the fan section is internally provided with a digital EC fan.
6. The multistage air treatment device for realizing ultrahigh precision control according to claim 1, wherein a primary filtering section is arranged between the air mixing section and the dehumidifying surface air cooler.
7. The multistage air treatment device for realizing ultrahigh precision control according to claim 1, wherein an electric heating humidifier is arranged between the electric heater and the secondary air mixing section.
8. The multistage air treatment device for realizing ultrahigh precision control according to claim 1, wherein the dehumidification surface air cooler and the deep dehumidification surface air cooler both adopt low-temperature chilled water, and the temperature control surface air cooler adopts high-temperature chilled water.
9. A multi-stage air processing method for realizing ultrahigh-precision control, which is characterized in that the multi-stage air processing equipment for realizing ultrahigh-precision control of any one of claims 1 to 8 is adopted, and the multi-stage air processing method comprises the following steps:
mixing fresh air and return air in an air mixing section;
after mixing air, performing surface cooling dehumidification in a dehumidification surface air cooler;
deep cooling and dehumidifying in a deep dehumidification surface air cooler;
reheating in an electric heater;
mixing air in the secondary air mixing section;
carrying out moderate-humidity cooling in a temperature-controlled surface cooler;
detecting the temperature of the air supply, and if the temperature is lower than a preset value, heating the air supply in a high-precision electric heater and then sending the air supply out;
the intelligent control cabinet of the unit adopts a PLC to realize the process of controlling the steps by a multivariable neural network.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201652635U (en) * | 2010-04-29 | 2010-11-24 | 茂名学院 | Novel constant temperature and humidity purification air-conditioning unit |
| CN102213477A (en) * | 2011-05-24 | 2011-10-12 | 东莞市中科机电安装工程有限公司 | Intelligent network energy conservation system for constant temperature and humidity air conditioner |
| CN103094818A (en) * | 2013-01-18 | 2013-05-08 | 中国科学院光电研究院 | Temperature control method and system for excimer laser |
| CN103335363A (en) * | 2013-05-22 | 2013-10-02 | 华中科技大学 | Control device and control method for integral centralized air processing system |
| CN203880880U (en) * | 2014-06-06 | 2014-10-15 | 深圳市中和国泰节能科技有限公司 | Constant temperature and humidity clean air cabinet intelligent energy-saving system |
| CN104121650A (en) * | 2014-07-24 | 2014-10-29 | 北京康孚科技股份有限公司 | Energy-saving centralized air conditioning dehumidification system for tobacco mellowing warehouse and control method |
| KR101562744B1 (en) * | 2014-06-13 | 2015-10-22 | 주식회사 귀뚜라미 범양냉방 | Air handling system interworking with ventilation unit |
| CN205026834U (en) * | 2015-08-14 | 2016-02-10 | 北京小蚁节能技术有限公司 | Purify dehumidification air conditioning unit |
| CN112032863A (en) * | 2020-09-10 | 2020-12-04 | 中山市科瓦特机电有限公司 | High-precision constant-temperature and constant-humidity system |
| CN216308046U (en) * | 2021-11-03 | 2022-04-15 | 珠海格力电器股份有限公司 | Air treatment equipment and air conditioning system |
-
2022
- 2022-12-15 CN CN202211615176.9A patent/CN115900012A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201652635U (en) * | 2010-04-29 | 2010-11-24 | 茂名学院 | Novel constant temperature and humidity purification air-conditioning unit |
| CN102213477A (en) * | 2011-05-24 | 2011-10-12 | 东莞市中科机电安装工程有限公司 | Intelligent network energy conservation system for constant temperature and humidity air conditioner |
| CN103094818A (en) * | 2013-01-18 | 2013-05-08 | 中国科学院光电研究院 | Temperature control method and system for excimer laser |
| CN103335363A (en) * | 2013-05-22 | 2013-10-02 | 华中科技大学 | Control device and control method for integral centralized air processing system |
| CN203880880U (en) * | 2014-06-06 | 2014-10-15 | 深圳市中和国泰节能科技有限公司 | Constant temperature and humidity clean air cabinet intelligent energy-saving system |
| KR101562744B1 (en) * | 2014-06-13 | 2015-10-22 | 주식회사 귀뚜라미 범양냉방 | Air handling system interworking with ventilation unit |
| CN104121650A (en) * | 2014-07-24 | 2014-10-29 | 北京康孚科技股份有限公司 | Energy-saving centralized air conditioning dehumidification system for tobacco mellowing warehouse and control method |
| CN205026834U (en) * | 2015-08-14 | 2016-02-10 | 北京小蚁节能技术有限公司 | Purify dehumidification air conditioning unit |
| CN112032863A (en) * | 2020-09-10 | 2020-12-04 | 中山市科瓦特机电有限公司 | High-precision constant-temperature and constant-humidity system |
| CN216308046U (en) * | 2021-11-03 | 2022-04-15 | 珠海格力电器股份有限公司 | Air treatment equipment and air conditioning system |
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