CN113805623B - Temperature stabilization regulation control model of air self-convection box type partition plate device and application method - Google Patents
Temperature stabilization regulation control model of air self-convection box type partition plate device and application method Download PDFInfo
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Abstract
The invention discloses a temperature stabilization regulation control model of an air self-convection box type partition plate device and an application method, and belongs to the field of energy conservation and environmental protection. The box-type partition plate device comprises a box body, wherein air inlet air doors are respectively arranged at two ends of the box body, a W-shaped guide plate is arranged in the box body, and air outlet pipes are respectively arranged above a tapered channel formed by the top of the box body corresponding to the guide plate; the temperature stabilizing adjustment control model comprises a flue gas temperature monitoring unit, air inlet doors positioned at two ends of the box body and a positioning control unit used for controlling the opening degree of the air doors. According to the invention, through reasonable design of the adjusting control model, accurate, linkage and difference delay adjusting modes are realized to keep heat exchange of the box body, automatic adjustment of the temperature stabilizing system of the self-convection box body is realized, the defect of traditional direct cold air cooling adjustment is overcome, the requirement of stable flue gas temperature of a production system is met, the pressure of the production system is synergistically stabilized, and the load and the power consumption of a main fan are reduced.
Description
Technical Field
The invention relates to the technical field of energy conservation and environmental protection, in particular to a temperature-stabilizing regulation control model of an air self-convection box-type partition plate device and an application method.
Background
The continuous upgrading of national green production and energy-saving emission reduction standards, and the realization of ultra-clean emission of various production flue gases such as sintering, pelletizing, raw material drying, heating furnaces and the like in the ferrous metallurgy production are all required. The flue gas treatment is carried out by a single short-process electric dust removal (bag dust removal) device for dust collection, and is upgraded into long-process electric dust removal (bag dust removal) + desulfurization + denitration + treatment by a bag dust remover. The flue gas pretreatment device is additionally arranged in front of the dust remover, and is a new focus of research in the industry at present, how to realize temperature stabilization regulation and stop the work of a cold air valve of a process system, improve the production stability, and realize the electric precipitation, desulfurization and denitration of flue gas purification treatment in coordination, and meanwhile, the atmospheric consumption of sintering production is reduced, and the treatment capacity of flue gas purification and emission in production is reduced, so that the energy conservation and environmental protection of the metallurgical production are really realized with great breakthrough.
Through retrieval, the application of Chinese patent application No. 202010920484 discloses a low-temperature cold air generating device and a control method for stabilizing temperature and pressure, wherein the application can improve the heat exchange stability of a system by arranging a heat exchanger on a liquid nitrogen conveying pipeline, and can quickly adjust the pressure and temperature of required cold air to meet the required requirements. Also, for example, the application No. 201911341710X in chinese patent application discloses a control output method and a control system for an opening degree adjustment interval of an air door of a dust removing device, wherein a required opening degree value adjustment interval is maintained according to an opening degree state of the air door of the dust removing device, and a value required for the opening degree of the air door of the dust removing device is increased or decreased within a specified time according to a set adjustment amount in the value adjustment interval through a value adjustment control module, so that the opening degree of the air door of the dust removing device is effectively controlled. The coordination control of interval control and adjustment of output values is realized, and the occurrence of overshoot of a control object is avoided. However, the above applications are not suitable for temperature stabilization adjustment of the flue gas pretreatment system, and there is still room for further improvement in stabilizing the temperature of the produced flue gas.
Disclosure of Invention
1. Technical problems to be solved by the invention
The invention provides a temperature-stabilizing regulation control model of an air self-convection box-type partition plate device and an application method, wherein the air self-convection box-type partition plate device exchanges heat with flue gas of an indirect production system, and the regulation modes of precision, linkage and difference delay are realized to keep box body heat exchange through reasonable regulation control model design, so that simple and reliable automatic regulation of a temperature-stabilizing system of a self-convection box body is realized, the defect of traditional direct cold air mixing and cooling regulation is overcome, and the requirement of stable temperature of the flue gas of the production system is met; support production flue gas processing system and stabilize temperature steady voltage dust fall flue gas volume triple optimization in coordination, promote the handling capacity of gas cleaning and emission, further promote the operating efficiency, really realize green production.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to a temperature stabilizing and adjusting control model of an air self-convection box-type clapboard device, which comprises a box body, wherein air inlet air doors are respectively arranged at two ends of the box body; the temperature stabilizing regulation control model comprises a flue gas temperature monitoring unit, an ambient temperature monitoring unit, air inlet doors and a positioning control unit, wherein the flue gas temperature monitoring unit and the ambient temperature monitoring unit are arranged outside the box body, the air inlet doors are arranged at two ends of the box body, and the positioning control unit is used for controlling the opening degree of the air doors.
Furthermore, the flue gas temperature monitoring unit comprises two groups of temperature sensors arranged outside the box body, and the two groups of temperature sensors are respectively positioned at the inlet and the outlet of the flue.
Furthermore, a purging pipeline for purging the two groups of temperature sensors is further arranged outside the flue, and electromagnetic valves and bypass valves which are distributed in parallel are respectively arranged on the purging pipeline to control on-off.
The invention discloses a temperature stabilization regulation application method of an air self-convection box type partition plate device, which comprises the following steps of:
s1, detecting the actual temperature of the flue gas in a flue by a flue gas temperature monitoring unit, and determining the opening and closing state of an air inlet damper according to the positive and negative difference values of the actual temperature and a standard temperature value;
and S2, determining and controlling the opening of the air inlet damper according to the difference value of the actual temperature and the standard temperature value.
Furthermore, the flue gas temperature monitoring unit in the S1 adopts two groups of temperature sensors to measure the flue gas in real time, and the flue gas temperature is averaged by the DCS control system to obtain the actual flue gas temperature T1.
Furthermore, the flue gas temperature monitoring unit in the S1 is provided with a purging device for purging periodically, and the purging mode is performed according to the following rules:
an automatic purging mode: the DCS sends a signal to open the electromagnetic valve at intervals, and compressed air automatically sweeps the temperature sensor; when the detected temperature is abnormal, the DCS control system gives an alarm, at the moment, the bypass valve is manually opened to purge the temperature sensors, and the flue gas temperature monitoring unit automatically takes the measured values of the other group of temperature sensors as the actual temperature T1; and after the fault is eliminated, the bypass valve is closed, and the DCS control system recovers the T1 value-taking rule.
Furthermore, in S2, the DCS control system calculates the difference value delta T between the actual temperature T1 of the flue gas and the standard temperature T, the relation between the opening degree of the air door and the environment temperature has a @ coefficient, @ =1+ (25 + environment temperature T)/100, and when the delta T is a positive value, the opening degree of the air inlet air door is automatically adjusted according to the following rules: when the temperature is more than 0 ℃ and less than delta T and less than 3 ℃, the air inlet air door starts to be closed, a delay signal is triggered, and the time delay signal is waited for 90-150s until the air inlet air door is completely closed;
when delta T is more than or equal to 3 ℃ and less than 5 ℃, after the opening of the air inlet damper is adjusted to be equal to @ 30% +/-5%, a signal is fed back to the DCS control system, the DCS control system sends out an air inlet damper stop signal, and the air inlet damper stops acting;
when delta T is more than or equal to 5 ℃ and less than or equal to 8 ℃, after the opening of the air inlet air door reaches @ 60% +/-5%, a signal is fed back to the DCS control system, the DCS control system sends out an air inlet air door stop signal, and the air inlet air door stops acting;
when the delta T is more than 8 ℃, after the opening of the air inlet damper reaches 100%, a signal is fed back to the DCS control system, the DCS control system sends out an air inlet damper stop signal, and the air inlet damper stops acting.
Furthermore, the DCS control system in the S2 calculates the difference value delta T between the actual temperature T1 of the flue gas and the standard temperature T, and when the delta T is a non-positive value, the opening degree of the air inlet air door is automatically adjusted according to the following rule:
when the temperature is lower than minus 2 ℃ and delta T is lower than 0 ℃, the air inlet air door starts to be closed, a delay signal is triggered, and the time delay signal is waited for 90-150s until the air inlet air door is completely closed;
when delta T is more than or equal to minus 2 ℃ and less than or equal to minus 5 ℃, after the opening degree of the air inlet damper is adjusted to be 50% +/-5%, a signal is fed back to the DCS control system, the DCS control system sends out an air inlet damper stop signal, and the air inlet damper stops acting;
when the delta T is less than-5 ℃, after the opening degree of the air inlet air door is adjusted to 0%, a signal is fed back to the DCS control system, the DCS control system sends out an air inlet air door stop signal, and the air inlet air door stops acting;
Δ T =0, the intake damper state is kept stationary.
Further, the standard temperature T is 100-200 ℃.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) The air self-convection box-type partition plate temperature stabilization regulation control model can meet the control requirement of air self-convection box-type partition plate temperature stabilization regulation, automatically realizes negative pressure regulation and differential delay regulation, and improves the hit rate of a temperature stabilization box body in regulating the flue gas temperature.
(2) The application method provided by the invention is provided with the double-temperature detection unit and the left and right air inlet doors for linkage control, so that the accuracy of temperature monitoring is met, the heat exchange capacity is further improved, and the control efficiency is improved.
Drawings
FIG. 1 is a schematic view of the structure of the box-type baffle apparatus for self-convection of air according to the present invention;
FIG. 2 is a schematic diagram of a control route of the temperature stabilizing adjustment control model according to the present invention.
The reference numerals in the schematic drawings illustrate:
100. a box-type partition device; 101. an intake air door; 102. an air delivery pipe; 103. a baffle;
200. an upper computer; 201. a DCS control system; 202. an air intake line; 203. an electromagnetic valve; 204. a bypass valve; 205. purging a pipeline; 206. a temperature sensor; 207. an air inlet flap valve; 208. an ambient temperature sensor; 300. a flue.
Detailed Description
For a further understanding of the invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The present invention will be further described with reference to the following examples.
Example 1
As shown in fig. 1, the box-type partition board apparatus for air self-convection in the present embodiment is obtained by adding the partition board type dust-settling, pressure-stabilizing and temperature-stabilizing pretreatment system for sintering flue gas before a dust remover, that is, the box-type partition board apparatus for air self-convection in the present embodiment 100 includes a box body, air inlet doors 101 are respectively disposed at the bottoms of two ends of the box body, a W-shaped guide plate 103 is disposed inside the box body, and air outlet pipes 102 are respectively disposed above a tapered channel formed by the top of the box body corresponding to the guide plate 103; as shown in fig. 1, 4 groups of air deflectors 103 in the box are all arranged obliquely, and the upper and lower ends of each air deflector are not in contact with the upper and lower inner walls of the box, and the two adjacent groups of air deflectors 103 are not in contact with each other, and the 4 groups of air deflectors are arranged in a W-shaped manner, wherein the air deflectors 103 near the air inlet door 101 are obliquely extended from the bottom to the direction near the inner wall of the end of the box gradually, and the leftmost air deflector 103 near the left air inlet door 101 is obliquely extended to the leftmost inner wall upwards in the direction of fig. 1, so that a gradually-tapered flow channel is formed between the air deflector and the inner wall of the left side of the box, and the top of the channel is correspondingly provided with the air outlet pipe 102 at the leftmost end; the rightmost guide plate 103 is inclined and extends upwards along the bottom and gradually towards the direction close to the right inner wall of the box body, a flow channel with gradually reduced space is formed between the guide plate and the right inner wall of the box body, and the top of the channel is correspondingly provided with the rightmost air outlet pipe 102; the two middle groups of guide plates 103 extend from the bottom upwards gradually towards the direction close to the middle part of the box body in an inclined manner, so that a flow channel with a gradually reduced space is formed in the middle, and the top of the channel is correspondingly provided with the air outlet pipe 102 in the middle. The incoming flue gas is processed through three sets of converging flow channels and is finally discharged out of the air delivery duct 102.
In practice, the box-type baffle device 100 is placed in a flue 300 for application, specifically, if the box-type baffle device is applied to a dust removal flue 300, and is used for performing temperature stabilization regulation control on flue gas in the flue 300, specifically, as shown in fig. 2, the temperature stabilization regulation control model of the air self-convection box-type baffle device of the embodiment comprises a flue gas temperature monitoring unit arranged outside a box body, an ambient temperature monitoring unit, air inlet dampers 101 arranged at two ends of the box body, and a positioning control unit used for controlling the opening degree of the dampers. The flue gas temperature monitoring unit comprises two groups of temperature sensors 206 arranged outside the box body, the two groups of temperature sensors 206 are respectively located at the inlet and outlet positions in the flue 300, a purging pipeline 205 used for purging the two groups of temperature sensors 206 is further arranged outside the box body, and the purging pipeline 205 is respectively provided with an electromagnetic valve 203 and a bypass valve 204 which are distributed in parallel to control on-off. The air inlet mode of the box body meets the requirements of the low negative pressure heat exchange process. The ambient temperature monitoring unit is an ambient temperature sensor 208 disposed outside the case.
As shown in fig. 2, the control route schematic diagram of the temperature stabilizing adjustment control model in this embodiment is also a route schematic diagram of the temperature stabilizing adjustment control model, the temperature stabilizing adjustment control model of this embodiment further includes an upper computer 200 and a DCS control system 201, wherein the DCS control system 201 is connected to the upper computer 200, and the DCS control system 201 is further connected to and performs signal control on an ambient temperature sensor 208, two sets of temperature sensors 206, a purge line 205 of the temperature sensor 206, an intake line 202 formed by an intake damper 101, an exhaust line formed by an air delivery pipe 102, and the like. An electromagnetic valve 203 and a bypass valve 204 are arranged on a purge line 205 of the temperature sensor 206, and the on-off of the purge line 205 can be controlled respectively. The two air inlet pipelines 202 are respectively provided with an air inlet flap valve 207, namely the corresponding air inlet flap valve 207 on the air inlet damper 101, and the opening of the air inlet damper 101 is controlled by controlling the air inlet flap valve 207.
The temperature stabilizing adjustment application method of the air self-convection box-type partition plate device comprises the following steps of:
s1, a flue gas temperature monitoring unit detects the actual temperature of flue gas in a flue 300, and the opening and closing state of an air inlet damper 101 is determined according to the positive and negative difference value of the actual temperature and a standard temperature value;
and S2, determining and controlling the opening of the air inlet damper 101 according to the difference value between the actual temperature and the standard temperature value.
Specifically, in S1, the flue gas temperature monitoring unit uses two sets of temperature sensors 206 to measure the flue gas in real time, and the flue gas temperature is averaged by the DCS control system 201 to obtain the actual flue gas temperature T1. The flue gas temperature monitoring unit in the S1 is provided with a purging device for periodic purging, and the purging mode is carried out according to the following rules:
an automatic purging mode: the DCS control system 201 sends a signal to open the electromagnetic valve 203 at intervals, and compressed air automatically purges the temperature sensor 206; when the temperature is detected to be abnormal, the DCS control system 201 gives an alarm, at the moment, the bypass valve 204 is manually opened to purge the temperature sensor 206, and the flue gas temperature monitoring unit automatically takes the measured value of the other group of temperature sensors 206 as the actual temperature T1; after the fault is eliminated, the bypass valve 204 is closed, and the DCS control system 201 recovers the T1 value-taking rule.
It should be noted that, in S2, the difference Δ T between the actual temperature T1 of the flue gas and the standard temperature T is calculated by the DCS control system 201, and a @ coefficient is present in the relationship between the opening degree of the air door and the ambient temperature, and @ 1+ (25 + ambient temperature T)/100, that is, when the ambient temperature T is 25 ℃, the @ value is 1.5; when Δ T is a positive value, the automatic adjustment of the opening degree of the intake damper 101 is performed according to the following rule:
when the temperature is 0 ℃ and delta T is less than 3 ℃, the air inlet damper 101 starts to be closed, the air inlet damper 101 is triggered to delay signals, and the time delay signals are waited for 90-150s until the time delay signals are completely closed;
when delta T is more than or equal to 3 ℃ and less than 5 ℃, after the opening degree of the air inlet damper 101 is adjusted to @ 30% +/-5%, the position feedback signal is fed back to the DCS control system 201, the DCS control system 201 sends out a stop signal of the air inlet damper 101, and the air inlet damper 101 stops acting;
when delta T is more than or equal to 5 ℃ and less than or equal to 8 ℃, after the opening degree of the air inlet air door 101 reaches @ 60% +/-5%, a signal is fed back to the DCS control system 201, the DCS control system 201 sends out a stop signal of the air inlet air door 101, and the air inlet air door 101 stops acting;
when the delta T is more than 8 ℃, after the opening degree of the air inlet air door 101 reaches 100%, a signal is fed back to the DCS control system 201, the DCS control system 201 sends out a stop signal of the air inlet air door 101, and the air inlet air door 101 stops operating.
Further, in S2, the DCS control system 201 calculates a difference Δ T between the actual temperature T1 of the flue gas and the standard temperature T, and when Δ T is a non-positive value, the opening of the intake damper 101 is automatically adjusted according to the following rule:
when the temperature is lower than 2 ℃ and is lower than delta T and lower than 0 ℃, the air inlet damper 101 starts to be closed, the air inlet damper 101 is triggered to delay signals, and the time delay signals are waited for 90-150s until the air inlet damper is completely closed;
when delta T is more than or equal to minus 2 ℃ and less than or equal to minus 5 ℃, after the opening degree of the air inlet damper 101 is adjusted to @ 50% +/-5%, the position feedback signal is fed back to the DCS control system 201, the DCS control system 201 sends out a stop signal of the air inlet damper 101, and the air inlet damper 101 stops acting;
when the delta T is less than-5 ℃, after the opening degree of the air inlet damper 101 is adjusted to 0%, a signal is fed back to the DCS control system 201, the DCS control system 201 sends out a stop signal of the air inlet damper 101, and the air inlet damper 101 stops acting;
when Δ T =0, the intake damper 101 remains stationary. In this embodiment, the standard temperature T is 100 to 200 ℃, specifically set according to practical application requirements.
By adopting the temperature-stabilizing regulation control model of the embodiment, the control requirement of the temperature-stabilizing regulation of the air self-convection box-type partition plate can be met, negative pressure regulation and differential time delay regulation are automatically realized, and the hit rate of the temperature-stabilizing box body for regulating the flue gas temperature is improved; the self-convection type temperature stabilizing partition plate is provided with the double-temperature detection unit and the left and right air inlet door in linkage control, the accuracy of temperature monitoring is met, the heat exchange capacity is further improved, and the control efficiency is improved. The following description is made in conjunction with specific application cases:
example 2
Application to sintering production scenarios: combine traditional on-the-spot arrangement in the thick flue gas device of handling in advance before electrostatic precipitator, installation second grade box baffle device 100, second grade box baffle device 100 is arranged from top to bottom with the flue gas import and export, imported box baffle device 100, its air inlet door 101 that advances the air carries out automatically regulated along with the thick flue gas temperature of import, the air inlet door 101 of the box baffle device 100 of export carries out automatically regulated along with the thick flue gas temperature of export, in order to further promote the air inlet door 101 automatically regulated of steady temperature effect second grade box baffle device 100, adopt the delayed interlocking automatic control regulation mode in coordination of difference, further promote the stability of flue gas temperature, thick flue gas temperature 150 +/-5 ℃ reaches more than 60%. The coarse flue gas bypasses the secondary box type partition plate device 100 and turns for three times at variable speed, and millimeter-sized dust particles are collected by more than 30%. The pressure of a dust removal/production system is stabilized by indirectly participating in cold air, the coincidence of a main fan is reduced, and the overhaul period of the electric/bag-type dust remover is prolonged.
Example 3
The method is applied to a pellet production scene, the basic structure method is basically the same as that of the embodiment 2, and the difference is as follows:
the pretreatment device is combined with an inlet and an outlet of a traditional site position on a high altitude straight line, a first-level box-shaped clapboard device 100 is adopted, the height is increased to more than 30 meters, and about 40 percent of millimeter-sized dust particles are collected through detection.
An air inlet air door 101 of the box-type clapboard device 100 is automatically adjusted along with the temperature of the coarse flue gas at the outlet, air self-convection heat exchange is adopted, clean hot air after heat exchange is directly discharged through an air outlet pipe 102, and the temperature of the coarse flue gas reaches about 40 percent within 150 +/-5 ℃.
Example 4
The method is applied to a raw material drying production scene, a basic structure method adopts a primary clapboard as in the embodiment 3, and the difference and the improvement are as follows: in order to meet the requirement of the flue gas temperature below 100 ℃ of the working temperature of the cloth bag dust removal cloth bag, the box-type clapboard device 100 is not installed in the air door 101, the width is increased to more than 20 meters, the heat exchange area is increased, the air outlet pipe 102 is thickened to phi 1000 < - > to quickly and fully reduce the flue gas temperature, and the detected flue gas temperature is reduced to about 80 ℃.
Example 5
Be applied to steel scrap heating production single-point dust absorption scene, the basic structure is the same as embodiment 4, and the difference lies in with the improvement:
in order to fully recover the zinc element in the crude flue gas produced by heating scrap steel and ensure that the zinc element does not damage the recycling of the dedusting ash of a steelmaking dedusting large system, the height and the width of a plant are limited, and in order to ensure the heat exchange area, the box-type clapboard devices 100 are added to three levels and are arranged in a vertically staggered manner, the temperature of the flue gas is reduced to be below 120 ℃, and the zinc element is fully cooled, gathered and recovered to reach more than 90 percent through detection.
The present invention and its embodiments have been described above schematically, and the description is not intended to be limiting, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (1)
1. A temperature stabilizing and adjusting application method of an air self-convection box type partition plate device is characterized by comprising the following steps of: the temperature stabilizing and adjusting control model adopts an air self-convection box-type partition plate device, the box-type partition plate device (100) comprises a box body, air inlet doors (101) are respectively arranged at two ends of the box body, a W-shaped guide plate (103) is arranged in the box body, and air outlet pipes (102) are respectively arranged above a tapered channel formed by the top of the box body corresponding to the guide plate (103); the temperature stabilizing adjustment control model comprises a flue gas temperature monitoring unit, an environment temperature monitoring unit, air inlet air doors (101) and a positioning control unit, wherein the flue gas temperature monitoring unit and the environment temperature monitoring unit are arranged outside the box body; the flue gas temperature monitoring unit comprises two groups of temperature sensors (206) arranged outside the box body, and the two groups of temperature sensors (206) are respectively positioned at the inlet and outlet positions in the flue (300); a purging pipeline (205) for purging the two groups of temperature sensors (206) is further arranged outside the box body, and the purging pipeline (205) is respectively provided with an electromagnetic valve (203) and a bypass valve (204) which are distributed in parallel to control connection and disconnection;
the method comprises the following steps:
s1, detecting the actual temperature of the flue gas in a flue (300) by a flue gas temperature monitoring unit, and determining the opening and closing state of an air inlet damper (101) according to the positive and negative difference values of the actual temperature and a standard temperature value;
specifically, the flue gas temperature monitoring unit adopts two groups of temperature sensors (206) to measure the flue gas in real time, and the flue gas temperature is averaged by a DCS control system (201) to obtain the actual flue gas temperature T1;
and the flue gas temperature monitoring unit is provided with a purging device for purging regularly, and the purging mode is carried out according to the following rules:
an automatic purging mode: the DCS control system (201) sends a signal to open the electromagnetic valve (203) at intervals, and compressed air automatically purges the temperature sensor (206); when the detected temperature is abnormal, the DCS control system (201) gives an alarm, at the moment, the bypass valve (204) is manually opened to purge the temperature sensor (206), and the flue gas temperature monitoring unit automatically takes the measured value of the other group of temperature sensors (206) as the actual temperature T1; after the fault is eliminated, the bypass valve (204) is closed, and the DCS control system (201) recovers the T1 value-taking rule;
s2, determining and controlling the opening degree of the air inlet damper (101) according to the difference value between the actual temperature and the standard temperature value, specifically,
the method comprises the following steps that a DCS (distributed control system) calculates a difference value delta T between an actual temperature T1 of flue gas and a standard temperature T, and a @ coefficient exists in the relation between the opening degree of an air door and the environment temperature, wherein @ is =1+ (25 + environment temperature T)/100; the standard temperature T is 100-200 ℃;
when the delta T is a positive value, the opening degree of the air inlet air door (101) is automatically adjusted according to the following rule:
when the temperature is more than 0 ℃ and less than delta T and less than 3 ℃, the air inlet air door (101) starts to be closed, a delay signal is triggered, and the time is waited for 90-150s until the air inlet air door is completely closed;
when delta T is more than or equal to 3 ℃ and less than 5 ℃, after the opening degree of the air inlet air door (101) is adjusted to @ 30% +/-5%, a feedback signal is sent to the DCS control system (201), the DCS control system (201) sends out a stop signal of the air inlet air door (101), and the air inlet air door (101) stops acting;
when delta T is more than or equal to 5 ℃ and less than or equal to 8 ℃, after the opening degree of the air inlet air door (101) reaches @ 60% +/-5%, a signal is fed back to the DCS control system (201), the DCS control system (201) sends out a stop signal of the air inlet air door (101), and the air inlet air door (101) stops operating;
when the delta T is more than 8 ℃, after the opening degree of the air inlet air door (101) reaches 100%, feeding back a signal to the DCS control system (201), sending a stop signal of the air inlet air door (101) by the DCS control system (201), and stopping the action of the air inlet air door (101);
when the delta T is not positive, the automatic adjustment of the opening degree of the air inlet damper (101) is carried out according to the following rule:
when the temperature is lower than 2 ℃ and is lower than delta T and lower than 0 ℃, the air inlet air door (101) starts to be closed, a delay signal is triggered, and the time delay signal is waited for 90-150s until the air inlet air door is completely closed;
when delta T is more than or equal to minus 2 ℃ and less than or equal to minus 5 ℃, after the opening degree of the air inlet damper (101) is adjusted to be equal to @ 50% +/-5%, a feedback signal is sent to the DCS control system (201), the DCS control system (201) sends out a stop signal of the air inlet damper (101), and the air inlet damper (101) stops acting;
when the delta T is less than-5 ℃, after the opening degree of the air inlet air door (101) is adjusted to 0%, a signal is fed back to the DCS control system (201), the DCS control system (201) sends out a stop signal of the air inlet air door (101), and the air inlet air door (101) stops acting;
when Δ T =0, the state of the intake damper (101) is kept.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110966555.1A CN113805623B (en) | 2021-08-23 | 2021-08-23 | Temperature stabilization regulation control model of air self-convection box type partition plate device and application method |
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| CN202110966555.1A CN113805623B (en) | 2021-08-23 | 2021-08-23 | Temperature stabilization regulation control model of air self-convection box type partition plate device and application method |
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| CN113805623A CN113805623A (en) | 2021-12-17 |
| CN113805623B true CN113805623B (en) | 2022-10-04 |
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