Plant indoor temperature and humidity control system and control method

Abstract

The invention provides a control system and a control method for temperature and humidity in a factory building. The control method comprises the steps that the temperature sensor and the humidity sensor are used for collecting the indoor temperature and humidity of the plant respectively; and the control device controls the working states of the air supply fan and the air exhaust fan of the plant according to the collected temperature and humidity information. According to the method for controlling the indoor temperature and humidity of the factory building, the air supply fan, the air exhaust fan and the sensors of the related detection points are used for achieving a multivariable intelligent automatic control paper-making factory building ventilation system, a large amount of moisture is generated in the paper machine wet part and the sizing procedure in the paper-making factory building, and high-temperature heat sources are concentrated; the intelligent ventilation system has important significance for controlling the temperature and humidity of the workshop, preventing condensation corrosion, improving the operability of the paper machine, saving energy and reducing consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plant temperature and humidity control, in particular to a plant indoor temperature and humidity control system and a control method. BACKGROUND

[0002] Modern conventional paper mill ventilation mostly uses a full mechanical air supply and exhaust system or a natural ventilator (air tower), and also uses a DCS control (Distributed Control System). However, most of them are in a manual start-stop mode. Although the air volume is controllable, it cannot be flexibly adjusted according to the actual environment, and there are problems such as low efficiency, high energy consumption, and easy condensation in winter. The existing system generally lacks intelligent self-linkage control adjustment functions based on production demand, weather, seasonal changes, and real-time detection data. It cannot achieve lean production control. SUMMARY

[0003] The first aspect of the embodiment of the present application provides a plant indoor temperature and humidity control method, which comprises:

[0004] The temperature sensor and the humidity sensor are used to collect the indoor temperature and humidity of the plant, respectively.

[0005] The control device controls the working state of the plant air supply fan and the exhaust fan according to the collected temperature and humidity information.

[0006] In some optional embodiments, the control method further comprises controlling the opening and closing state of the mechanical air supply and exhaust device.

[0007] In some optional embodiments, the step of controlling the working state of the plant air supply fan and the exhaust fan according to the collected temperature and humidity information comprises: judging whether the temperature and humidity are greater than the opening threshold value, and if so, opening the exhaust fan.

[0008] In some optional embodiments, the step of controlling the working state of the plant air supply fan and the exhaust fan according to the collected temperature and humidity information further comprises: dividing the working intensity of the exhaust fan into multiple levels, and selecting the working intensity level of the exhaust fan according to the collected temperature and humidity information.

[0009] In some optional embodiments, the step of controlling the working state of the plant air supply fan and the exhaust fan according to the collected temperature and humidity information comprises: dividing multiple temperature intervals, each temperature interval corresponding to a working intensity of the air supply fan, and controlling the working intensity of the air supply fan according to the temperature interval to which the collected temperature information belongs.

[0010] In some optional embodiments, the step of collecting the indoor temperature and humidity of the factory building by using the temperature sensor and the humidity sensor respectively is repeated every preset time to feed back real-time data to the control device.

[0011] In some optional embodiments, the control method further comprises: controlling the prompting device to prompt.

[0012] In some optional embodiments, the control method further comprises: detecting the outdoor temperature of the factory building by using the temperature sensor.

[0013] In the second aspect, the embodiments of the present application provide a control system for indoor temperature and humidity of a factory building, which comprises: a control device, a temperature sensor, a humidity sensor, a supply fan and an exhaust fan; the temperature sensor, the humidity sensor, the supply fan and the exhaust fan are connected with the control device respectively, the temperature sensor and the humidity sensor collect the indoor temperature and humidity of the factory building respectively, and the control device is used to control the working state of the supply fan and the exhaust fan of the factory building according to the collected temperature and humidity information.

[0014] In some optional embodiments, the control system further comprises a mechanical air intake and exhaust device and a prompting device, which are connected with the control device respectively.

[0015] The control method for indoor temperature and humidity of a factory building provided by the embodiments of the present application realizes a multi-variable intelligent automatic control paper mill ventilation system by using the supply fan and the exhaust fan and the sensors of related detection points. A paper mill workshop produces a large amount of moisture due to the wet part of a paper machine and the gluing process, and a high-temperature heat source is concentrated. Therefore, the intelligent ventilation system is of great significance for controlling the temperature and humidity of the workshop, preventing condensation corrosion, improving the operation of the paper machine and saving energy and reducing consumption. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 is a composition structure block diagram of an embodiment of the control system for indoor temperature and humidity of a factory building of the present application;

[0018] Figure 2 is a flowchart of an embodiment of the control method for indoor temperature and humidity of a factory building of the present application;

[0019] Figure 3 is a working flowchart of the exhaust fan of the present application;

[0020] Figure 4 is a control logic schematic diagram of a fan of the application;

[0021] Figure 5 is a flow schematic diagram of another embodiment of a method for controlling indoor temperature and humidity in a factory building. DETAILED DESCRIPTION

[0022] The application will be described in further detail below with reference to the drawings and embodiments. It is to be particularly pointed out that the following embodiments are only for illustrating the application, but not for limiting the scope of the application. Similarly, the following embodiments are only part of the embodiments of the application, but not all the embodiments of the application. All other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the application.

[0023] The terms "first", "second", "third" in the embodiments of the application are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second", "third" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the application are only for explaining the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly. The terms "include" and "have" and any variations thereof in the embodiments of the application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or components inherent to the process, method, product or device.

[0024] In this document, reference to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combined with other embodiments.

[0025] The present application can find the minimum ventilation volume of each area of a specific plant and machine by relevant TAPPI standards (TAPPI standards are industry specifications formulated by the Technical Association of the Pulp and Paper Industry, covering test methods, quality control and performance evaluation of pulp, paper and paper products, widely used in the global papermaking and related industries.) and calculation simulation, and simulate the critical dew point temperature corresponding to different indoor temperatures, and realize relevant intelligent control through algorithm on this basis.

[0026] Please refer to Figure 1 , Figure 1 is the composition structure block diagram of an embodiment of the indoor temperature and humidity control system of the plant of the present application, which includes but is not limited to the following structures: a sensor 100, a control device 200, an actuator 300 and a prompting device 400.

[0027] Specifically, the sensor 100, the actuator 300 and the prompting device 400 are connected with the control device 200 respectively, and the control device 200 is used to control the working state of the sensor 100, the actuator 300 and the prompting device 400. The control device 200 can be a control circuit board embedded with a corresponding control system, such as a DCS control (Distributed Control System).

[0028] Among them, the sensor 100 can include a temperature sensor 110, a humidity sensor 120 and a steam pressure sensor 130, etc. The temperature sensor 110 and the humidity sensor 120 collect the indoor temperature and humidity of the plant respectively.

[0029] Optionally, the actuator 300 can include a supply air fan 310, an exhaust air fan 320 and a mechanical air supply and exhaust device 330 (natural ventilator (air tower)), etc. Among them, the prompting device 400 can include an alarm, an indicator light, etc. Among them, the specific working method and process of the sensor 100, the control device 200, the actuator 300 and the prompting device 400 will be described in detail in the subsequent method embodiment.

[0030] Please refer to Figure 2 , Figure 2 is the flowchart of an embodiment of the indoor temperature and humidity control method of the plant of the present application, which includes but is not limited to the following steps.

[0031] Step S100, the indoor temperature Tw and humidity RHw of the plant are collected by the temperature sensor and the humidity sensor respectively.

[0032] The step repeats the feedback of the real-time data to the control device every preset time, for example, repeats the feedback of the real-time data to the control device every 15 minutes.

[0033] In addition, the step can further include detecting the outdoor temperature To of the factory building by using a temperature sensor.

[0034] Before the step S100, the following steps can be further included: calculating the minimum ventilation of each area, the air change rate of the main area of the workshop, and the critical dew point temperature corresponding to different indoor temperatures according to the specific workshop (size and insulation parameters) and the machine-related parameters; configuring the corresponding air supply and exhaust fans and the corresponding detection points, and obtaining the key temperature and humidity parameters of the workshop through simulation calculation.

[0035] In step S200, the control device controls the working state of the air supply and exhaust fans of the factory building according to the collected temperature and humidity information.

[0036] In this step, the working process of the exhaust fan is as shown in Figure 3 Figure 3 is a schematic diagram of the working process of the exhaust fan of the present application, wherein the working process of the exhaust fan includes the following steps.

[0037] In step S301, the working intensity of the exhaust fan is divided into multiple levels.

[0038] The levels of the working intensity are divided according to the temperature and humidity interval ranges, for example, the working intensity of the exhaust fan is divided into three levels of BASIC, STRONG, and FULL, the temperature and humidity ranges corresponding to the BASIC level are: temperature 20-25 degrees Celsius, humidity 20-30%; the temperature and humidity ranges corresponding to the STRONG level are: temperature 25-35 degrees Celsius, humidity 30-50%; and the temperature and humidity ranges corresponding to the FULL level are: temperature greater than 35 degrees Celsius, humidity greater than 50%.

[0039] In step S302, it is determined whether the temperature and humidity are greater than the starting threshold.

[0040] If yes, the step S303 is entered to start the exhaust fan, otherwise the step S304 is entered to end the process. Among them, the related parameters are executed in stages (for example, in a certain factory) by default. If Tw (temperature) > 20℃ and RHw (humidity) ≥ a certain value (for example, 20%), the exhaust fan is started. Among them, the temperature OFFSET (offset) adjustment range is ±3℃, and the relative humidity OFFSET adjustment range is ±5%.

[0041] In step S305, the working intensity level of the exhaust fan is selected according to the collected temperature and humidity information.

[0042] ​For example, according to which interval the collected temperature and humidity fall into, the corresponding working mode (BASIC, STRONG or FULL) is started.

[0043] In step S200, the control mode of the air supply fan includes dividing a plurality of temperature intervals, each temperature interval corresponding to a working intensity of the air supply fan, and controlling the working intensity of the air supply fan according to the temperature interval to which the collected temperature information belongs. Please refer to Figure 4 , Figure 4 is a control logic diagram of the air supply fan of the present application, wherein the working intensity of the air supply fan can also be divided into three grades of BASIC, STRONG and FULL. In the figure, To represents the outdoor temperature, and Tw represents the indoor temperature. The specific values of T1, T2, T3 and T4 can be set according to actual requirements.

[0044] In addition, the air supply fan can also plan the position arrangement of the heating fan in winter and the natural fan in summer, and the PID control of the heating circuit; start according to the related temperature To / Tw: (for example, a factory) by default, 18℃≤To≤23℃ is the BASIC mode control.

[0045] The air pressure enhancement control mode can also be selected: according to the deviation of the measured value and the set value and the deviation of the wet part and the dry part, the corresponding exhaust / air supply group is adjusted, and the wet part exhaust and the rational application of air flow are further strengthened. The air tower and the exhaust fan are linked: if the air tower is opened, the corresponding roof exhaust fan is stopped running, so as to avoid energy waste and air flow short circuit (air flow passes through the air tower and is sucked into the workshop); specific production modes such as food paper production mode: all air towers are closed, the system enters the full mechanical ventilation mode, and the production site cleanliness standard is ensured. All measurement points will alarm and display FAULT if the fluctuation within 5 seconds exceeds the set threshold. There is a corresponding equipment control mechanism in the FAULT state. Interlocking protection functions such as prohibition of starting in winter due to insufficient steam pressure, and detection point FAULT cannot start the system.

[0046] The plant indoor temperature and humidity control method provided by the embodiment of the present application realizes a multi-variable intelligent automatic control paper mill plant ventilation system by using air supply fans and exhaust fans and related detection point sensors. A paper mill workshop produces a large amount of moisture due to the wet part of the paper machine and the sizing process, and the high-temperature heat source is concentrated. The intelligent ventilation system has important significance for controlling the temperature and humidity of the workshop, preventing condensation corrosion, improving the operation of the paper machine, and saving energy and reducing consumption.

[0047] Please refer to Figure 5 , Figure 5 is a flow diagram of another embodiment of the plant indoor temperature and humidity control method of the present application. The control method includes but is not limited to the following steps.

[0048] Step S100, collecting the indoor temperature Tw and the humidity RHw of the factory building by using the temperature sensor and the humidity sensor.

[0049] In this step, the real-time data is fed back to the control device every preset time, for example, the real-time data is fed back to the control device every 15 minutes.

[0050] In addition, this step can also include detecting the outdoor temperature To of the factory building by using the temperature sensor and detecting the steam pressure (which can be converted into temperature and humidity values) by using the steam pressure sensor 130.

[0051] Before step S100, the following steps can also be included: calculating the minimum ventilation of each area, the air change rate of the main area of the factory, and the critical dew point temperature corresponding to different indoor temperatures according to the specific workshop (size and insulation parameters) and machine-related parameters; configuring the corresponding air supply and exhaust fans and corresponding detection points, and obtaining the key temperature and humidity parameters of the workshop through simulation calculation.

[0052] Step S200, the control device controls the working state of the air supply and exhaust fans of the factory building and the opening and closing state of the mechanical air inlet and outlet device according to the collected temperature and humidity information.

[0053] In this step, the working process of the exhaust fan is as shown in Figure 3 Figure 3 is a schematic diagram of the working process of the exhaust fan of the present application, wherein the working process of the exhaust fan includes the following steps.

[0054] Step S301, dividing the working intensity of the exhaust fan into multiple levels.

[0055] The levels of the working intensity are divided according to the humidity and temperature interval range, for example, the working intensity of the exhaust fan is divided into three levels of BASIC, STRONG, and FULL, the temperature and humidity range corresponding to the BASIC level is: temperature 20-25 degrees Celsius, humidity 20-30%; the temperature and humidity range corresponding to the STRONG level is: temperature 25-35 degrees Celsius, humidity 30-50%; and the temperature and humidity range corresponding to the FULL level is: temperature greater than 35 degrees Celsius, humidity greater than 50%.

[0056] Step S302, determining whether the temperature and humidity are greater than the opening threshold.

[0057] ​If yes, go to step S303, start the exhaust fan, otherwise go to step S304, end the process. Wherein, the relevant parameters are executed in stages (for example, a factory) by default, if Tw (temperature) > 20℃ and RHw (humidity) ≥ a certain value (for example, 20%), start the exhaust fan. Wherein, the temperature OFFSET adjustment range is ±3℃, and the relative humidity OFFSET adjustment range is ±5%.

[0058] Step S305, according to the collected temperature and humidity information, select the working intensity level of the exhaust fan.

[0059] For example, according to the collected temperature and humidity falling into which interval, the corresponding working mode (BASIC, STRONG or FULL) is started.

[0060] In step S200, the control mode of the supply fan can include: dividing a plurality of temperature intervals, each temperature interval corresponding to a working intensity of a supply fan, and controlling the working intensity of the supply fan according to the temperature interval to which the collected temperature information belongs. Please refer to Figure 4 , Figure 4 is a control logic diagram of the supply fan of the present application, wherein the working intensity of the supply fan can also be divided into three grades of BASIC, STRONG and FULL. In the figure, To represents the outdoor temperature, and Tw represents the indoor temperature. The specific values of T1, T2, T3 and T4 can be set according to actual needs.

[0061] In addition, the supply fan can also plan the position arrangement of the heating fan in winter and the natural fan in summer, and the heating loop PID control; according to the relevant temperature To / Tw start: (for example, a factory) by default, 18℃≤To≤23℃ is the BASIC mode control.

[0062] It can also select the air pressure enhancement control mode: according to the deviation of the measured value and the set value and the deviation of the wet part and the dry part, adjust the corresponding exhaust / supply group, further strengthen the wet part exhaust and the rational application of air flow. The air tower and the exhaust fan are linked, if the air tower is opened, the corresponding roof exhaust fan stops running, avoiding energy waste and air flow short circuit (air flow through the air tower and suck into the workshop); specific production mode such as food paper production mode: all air towers are closed, the system enters the full mechanical ventilation mode, ensuring the cleanliness standard of the production site. All measurement points fluctuate more than the set threshold within 5 seconds will alarm and display FAULT, there is a corresponding equipment control mechanism in the FAULT state. Interlock protection function such as winter steam pressure deficiency prohibits start, detection point FAULT cannot system start, etc.

[0063] The opening and closing state of the mechanical air inlet and exhaust device (air tower) can be adjusted by an automatic control valve or manually adjusted, which is not specifically limited here. The mechanical air inlet and exhaust device (air tower) can be divided into three groups according to the wet part, the dry part and the grinding section, has opening and closing limit and can realize DCS REMOTE control; opening and closing are realized according to indoor and outdoor temperature and humidity algorithms.

[0064] Please continue to refer to Figure 5 The control method in the embodiment further includes the step S300 of controlling the prompting device to prompt.

[0065] In this step, the alarm can be controlled to alarm when an exception occurs, or the running state of the entire system can be prompted by using an indicator light of different colors, and the detailed features of this part are within the understanding range of those skilled in the art, which will not be repeated here.

[0066] Compared with the prior art, the control method of the indoor temperature and humidity of the factory building has the following obvious advantages:

[0067] 1. A combination of multivariable automatic control and manual assistance is adopted to improve the response speed and control accuracy;

[0068] 2. Energy consumption is significantly reduced, and workshop comfort is considered: the most reasonable number of exhaust fans is written into the DCS algorithm, and the energy-saving effect is obvious. Natural ventilation is used in spring, summer and autumn; the comfort of personnel in the workshop in the southern region is fully considered in summer.

[0069] 3. Effectively reduces condensation corrosion problems in winter, prolongs the service life of the roof and equipment;

[0070] 4. The operation mode can be quickly switched according to the type of paper, and the needs of clean production and energy saving are considered;

[0071] 5. Strong system linkage, supports DCS centralized control and can make real-time parameter optimization according to manual experience (AI optimization is possible in the future), and is convenient for maintenance and operation;

[0072] 6. Realize the coordinated operation of the fan and the air tower, especially suitable for complex hot and humid environments in the southern region, and realize the low-carbon green manufacturing goal.

[0073] The control method can realize DCS automatic control of the paper mill workshop ventilation system, adapt to different seasons and paper requirements; without too much manual intervention. Improve the energy efficiency of the workshop, minimize the frequency and number of fans, and intelligently and automatically control to effectively reduce energy consumption; solve the problem of corrosion caused by condensation of moisture into condensate water in winter; realize the linkage control among air tower, air supply fan and exhaust fan, and automatically adjust the hierarchical operation; provide multi-variable temperature, humidity and pressure difference monitoring and control mechanism for the corresponding area, intelligently improve the response accuracy. The corresponding fan automatically starts and stops, accurate control, not too much or too little. One key to start and stop the whole system, simple operation.

[0074] The control method of indoor temperature and humidity of the plant provided by the embodiments of the present application realizes a multi-variable intelligent automatic control paper mill ventilation system by using mechanical air intake and exhaust device (air tower), air supply fan, exhaust fan and related detection point sensors. A large amount of moisture is generated in the wet part of the paper machine and the gluing process in the paper mill workshop, and high-temperature heat sources are concentrated. The intelligent ventilation system is of great significance for controlling the temperature and humidity of the workshop, preventing condensation corrosion, improving the operation of the paper machine, and saving energy and reducing consumption.

[0075] The above only describes some embodiments of the present application, and does not limit the protection scope of the present application. Any equivalent device or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A method for controlling indoor temperature and humidity in a factory building, characterized in that, The control method includes: Temperature and humidity sensors are used to collect indoor temperature and humidity data for the factory building, respectively. The control device controls the operating status of the factory's supply and exhaust fans based on the collected temperature and humidity information.

2. The control method according to claim 1, characterized in that, The control method further includes controlling the opening and closing state of the mechanical air intake and exhaust device.

3. The control method according to claim 1, characterized in that, The steps of controlling the working status of the factory's supply and exhaust fans based on the collected temperature and humidity information include: determining whether the temperature and humidity are greater than the opening threshold; if so, then turning on the exhaust fan.

4. The control method according to claim 3, characterized in that, The step of controlling the working status of the factory's supply and exhaust fans based on the collected temperature and humidity information further includes: dividing the working intensity of the exhaust fan into multiple levels, and selecting the working intensity level of the exhaust fan based on the collected temperature and humidity information.

5. The control method according to claim 1, characterized in that, The steps of controlling the working status of the factory's supply and exhaust fans based on the collected temperature and humidity information include: dividing the temperature range into multiple temperature ranges, each temperature range corresponding to the working intensity of a supply fan, and controlling the working intensity of the supply fan according to the temperature range to which the collected temperature information belongs.

6. The control method according to claim 1, characterized in that, The step of collecting indoor temperature and humidity data of the factory using temperature and humidity sensors respectively is repeated every preset time interval to feed back real-time data to the control device.

7. The control method according to claim 1, characterized in that, The control method further includes: using a control prompting device to provide prompts.

8. The control method according to claim 1, characterized in that, The control method also includes using a temperature sensor to detect the outdoor temperature of the factory building.

9. A control system for indoor temperature and humidity in a factory building, characterized in that, The control system includes: a control device, a temperature sensor, a humidity sensor, a supply fan, and an exhaust fan; the temperature sensor, humidity sensor, supply fan, and exhaust fan are respectively connected to the control device, the temperature sensor and humidity sensor respectively collect the indoor temperature and humidity of the factory, and the control device is used to control the working status of the factory's supply fan and exhaust fan according to the collected temperature and humidity information.

10. The control system according to claim 9, characterized in that, The control system also includes a mechanical air intake and exhaust device and a prompting device, which are respectively connected to the control device.

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