CN113262604A - Automatic control system for VOCs waste gas treatment and use method thereof - Google Patents
Automatic control system for VOCs waste gas treatment and use method thereof Download PDFInfo
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- CN113262604A CN113262604A CN202010900241.7A CN202010900241A CN113262604A CN 113262604 A CN113262604 A CN 113262604A CN 202010900241 A CN202010900241 A CN 202010900241A CN 113262604 A CN113262604 A CN 113262604A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/06—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
- B01D2253/108—Zeolites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
Abstract
The invention provides an automatic control system for VOCs waste gas treatment and a using method thereof, wherein the automatic control system comprises the following steps: the zeolite rotating wheel comprises an adsorption area and a desorption area; the rotating wheel motor is connected with the zeolite rotating wheel; the adsorption fan is connected with the zeolite rotating wheel; the desorption fan is connected with the zeolite rotating wheel; the electric heater is connected with the desorption fan; the reactor is connected with the electric heater; the purified gas cooling device is connected with the reactor, the purified gas cooling device is connected with a desorption area of the zeolite rotating wheel, and the controller is connected with the rotating wheel motor, the adsorption fan, the desorption fan, the electric heater, the reactor and the purified gas cooling device. The use method of the system comprises the following steps: the desorption fan drives the desorbed concentrated VOCs waste gas to enter an electric heater for heating, then enters a reactor and reacts in the reactor to form purified gas; the purified gas must pass through a purified gas cooling device and then is discharged to a desorption zone of the zeolite rotating wheel. The system and the use method thereof can realize automatic control of waste gas treatment, and avoid energy waste.
Description
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to an automatic control system for VOCs waste gas treatment and a using method thereof.
Background
VOCs (volatile organic compounds) refers to organic compounds having a saturated vapor pressure of more than 133.32Pa at normal temperature and a boiling point of 50-260 ℃ at normal pressure, or any organic solid or liquid capable of being volatilized at normal temperature and normal pressure. In the art, the zeolite wheel can be used to treat the VOCs waste gas, and the zeolite wheel can be understood as a wheel structure with zeolite filled on the surface.
As shown in fig. 1 and fig. 2, in the conventional VOCs waste gas treatment system, VOCs waste gas enters the integration box 100 from the inlet pipe 110 under the action of the inlet fan 200, and passes through the filtering device 300, and the filtering device 300 can remove particles in the waste gas; after the VOCs waste gas passes through the filtering device 300, 95% of the VOCs waste gas passes through the adsorption zone 410 of the zeolite rotating wheel device 400, the VOCs are adsorbed by the adsorbent in the adsorption zone 410, and the purified gas is discharged from the adsorption zone 410 of the zeolite rotating wheel device 400, passes through the exhaust fan 600 and the exhaust pipe 120, and is discharged to the outside of the integration box 100. After the VOCs waste gas passes through the filtering device 300, 5% of the VOCs waste gas passes through the cooling zone 420 of the zeolite rotating wheel device 400 to play a role of cooling the zeolite, and then passes through the heater 520 to form hot air, and the hot air passes through the desorption zone 430 of the zeolite rotating wheel device 400; VOCs adsorbed in the zeolite rotating wheel device 400 are desorbed and concentrated to the degree of 5-15 times under the action of hot air; the desorbed high-concentration VOCs airflow is pumped into the regenerative incinerator 530 by the desorption fan 510 for combustion, and the discharged clean carbon dioxide and water vapor are discharged out of the integration box 100 through the exhaust fan 600 and the exhaust pipe 120. The gas discharged from the regenerative incinerator 530 has a certain amount of heat, and the conventional VOCs waste gas treatment system cannot realize the recycling of the heat, thereby causing the waste of energy.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides an automatic control system for treating VOCs exhaust gas, which can automatically control the exhaust gas treatment and send the purified gas with heat to the desorption zone for recycling, and a method for using the same.
In order to achieve the above object, an embodiment of the present invention provides an automatic control system for treating VOCs waste gas, including:
a zeolite wheel comprising an adsorption zone and a desorption zone;
the rotating wheel motor is connected with the zeolite rotating wheel;
the adsorption fan is connected with the adsorption area of the zeolite rotating wheel;
the gas inlet of the desorption fan is connected with the gas outlet of the desorption area of the zeolite rotating wheel through a first desorption pipeline;
the air inlet of the electric heater is connected with the air outlet of the desorption fan;
the air inlet of the reactor is connected with the air outlet of the electric heater;
a purified gas inlet of the purified gas cooling device is connected with a gas outlet of the reactor, and a purified gas outlet of the purified gas cooling device is connected with a gas inlet of a desorption area of the zeolite rotating wheel through a second desorption pipeline;
and the controller is connected with the rotating wheel motor, the adsorption fan, the desorption fan, the electric heater, the reactor and the purified gas cooling device.
According to the automatic control system for VOCs waste gas treatment, in an initial state, the controller controls the desorption fan to be started, the desorption fan drives gas in the first desorption pipeline to enter the reactor to react to form purified gas after being heated by the electric heater, and the purified gas discharged from the reactor is discharged to the gas inlet of the desorption area of the zeolite rotating wheel after passing through the purified gas cooling device; meanwhile, the controller controls the adsorption fan to be started, the adsorption fan drives the VOCs waste gas to enter an adsorption area of the zeolite rotating wheel, the VOCs waste gas is adsorbed by the zeolite in the zeolite rotating wheel, and purified gas after adsorption treatment is discharged;
the controller controls a rotating wheel motor to be started, and the rotating wheel motor drives the zeolite rotating wheel to rotate, so that the zeolite adsorbing the VOCs waste gas rotates to a desorption region of the zeolite rotating wheel;
the desorption fan drives the desorbed concentrated VOCs waste gas to enter the electric heater, the concentrated VOCs waste gas is heated by the electric heater and then enters the reactor, and the desorbed concentrated VOCs waste gas reacts in the reactor to form purified gas; the purified gas discharged from the reactor must pass through a purified gas cooling device and then is discharged to an air inlet of a desorption area of the zeolite rotating wheel so as to desorb VOCs waste gas adsorbed on the zeolite;
this system can realize automatic control exhaust-gas treatment, and will have thermal purified gas and carry desorption district to carry out cyclic utilization, has avoided the waste of the energy.
Preferably, the automatic control system for the treatment of VOCs exhaust comprises at least one of the following features:
1) the automatic control system further comprises: the desorption inlet temperature monitoring device is connected with the controller and is arranged on an air inlet of a desorption area of the zeolite rotating wheel;
2) the automatic control system further comprises: and the reaction outlet temperature monitoring device is connected with the controller and is arranged on the gas outlet of the reactor.
The system can adjust the output power of the electric heater and the rotating speed of the zeolite rotating wheel according to the monitored temperature, so that the temperature in the system can be controlled more accurately.
Preferably, the automatic control system further comprises: the rotating wheel motion monitoring device and the desorption inlet temperature monitoring device are connected with the controller; the rotating wheel motion monitoring device is arranged on the zeolite rotating wheel; the desorption inlet temperature monitoring device is arranged on the air inlet of the desorption area of the zeolite rotating wheel.
The system can monitor the rotation period of the zeolite rotating wheel according to the rotating wheel movement monitoring device, when the controller judges that the rotation period of the zeolite rotating wheel is increased, the zeolite rotating wheel can stop at a position, and the controller stops.
Further, the automatic control system for VOCs exhaust treatment comprises at least one of the following features:
1) the automatic control system also comprises an air conveying branch, the air conveying branch is connected with the first desorption pipeline, a first control valve is arranged on the air conveying branch, and the first control valve is connected with the controller;
2) the automatic control system further comprises a purified gas exhaust branch, the purified gas exhaust branch is connected with the second desorption pipeline, a second control valve is arranged on the purified gas exhaust branch, and the second control valve is connected with the controller.
In the system, the desorption fan drives the desorbed concentrated VOCs waste gas and air input to the first desorption pipeline from the air conveying branch to be converged into gas to be purified, the gas to be purified is heated by the electric heater and then enters the reactor, and the gas to be purified reacts in the reactor to form purified gas; purified gas discharged from the reactor is discharged to an air inlet of a desorption area of the zeolite rotating wheel after passing through a purified gas cooling device;
in this system, according to the temperature of desorption district's air inlet that desorption import temperature monitoring devices monitored, the controller is when control electric heater's temperature, and control second control valve makes the temperature of desorption district's air inlet reach predetermined desorption import operating temperature scope.
The system adjusts the opening degrees of the first control valve and the second control valve through the monitored temperature, so that the temperature in the system is controlled more accurately.
Preferably, the purified gas cooling device is a heat exchanger, a waste gas inlet and a waste gas outlet are arranged on the purified gas cooling device, the waste gas inlet is connected with a gas outlet of a desorption area of the zeolite rotating wheel, and the waste gas outlet is connected with a gas inlet of the desorption fan through the first desorption pipeline. In the system, the purified gas and the waste gas exchange heat, so that the heat energy is recycled.
Further, the purified gas inlet, the purified gas outlet, the waste gas inlet and the waste gas outlet are all provided with heat exchange temperature monitoring devices, and the heat exchange temperature monitoring devices are connected with the controller.
In this system, according to each that acquires the temperature that heat transfer temperature monitoring devices monitored, when the temperature variation after the controller judges that purified gas heat transfer surpassed preset scope or the temperature variation after the waste gas heat transfer surpassed preset scope, the controller carries out the shutdown operation, overhauls purified gas heat sink to guarantee purified gas heat sink heat exchange efficiency.
Preferably, the automatic control system for the treatment of VOCs exhaust comprises at least one of the following features:
1) an adsorption inlet temperature monitoring device is arranged at an air inlet of the adsorption area, an adsorption outlet temperature monitoring device is arranged at an air outlet of the adsorption area, and the adsorption inlet temperature monitoring device and the adsorption outlet temperature monitoring device are both connected with the controller; when the controller judges that the gas temperature difference before and after adsorption exceeds a preset range, the controller stops the operation and overhauls the zeolite rotating wheel so as to ensure the adsorption and desorption efficiency of the zeolite rotating wheel;
2) a desorption outlet temperature monitoring device is arranged at a gas outlet of the desorption area and is connected with the controller; when the controller judges that the temperature of the gas outlet of the desorption area exceeds the preset desorption outlet safety temperature, the controller stops the machine to avoid the ignition of the zeolite rotating wheel caused by overhigh temperature of the desorption area;
3) an internal temperature monitoring device is arranged in the electric heater and is connected with the controller; when the controller judges that the temperature in the electric heater exceeds the preset internal safety temperature, the controller stops the operation to overhaul the electric heater so as to ensure the heating performance of the electric heater and prevent the electric heater from being damaged due to high temperature;
4) an electric heating inlet temperature monitoring device is arranged at an air inlet of the electric heater, and an electric heating outlet temperature monitoring device is arranged at an air outlet of the electric heater; the electric heating inlet temperature monitoring device and the electric heating outlet temperature monitoring device are both connected with the controller; when the controller judges that the gas temperature difference before and after the electric heater is heated exceeds a preset range, the controller stops the operation to overhaul the electric heater so as to ensure the heating performance of the electric heater and prevent the electric heater from being damaged due to high temperature;
5) the adsorption fan is connected with the monitoring end of a first frequency converter, and the data output end of the first frequency converter is connected with the controller; the first frequency converter transmits current data of the adsorption fan to the controller, and when the controller judges that the current of the adsorption fan exceeds a preset range, the controller stops the adsorption fan to overhaul the adsorption fan;
6) the rotating wheel motor is connected with the monitoring end of a second frequency converter, and the data output end of the second frequency converter is connected with the controller; the second frequency converter transmits current data of the rotary wheel motor to the controller, and when the controller judges that the current of the rotary wheel motor exceeds a preset range, the controller carries out shutdown operation so as to overhaul the rotary wheel motor;
7) the desorption fan is connected with the monitoring end of a third frequency converter, and the data output end of the third frequency converter is connected with the controller; the third frequency converter transmits current data of the desorption fan to the controller, and when the controller judges that the current of the adsorption fan exceeds a preset range, the controller stops the desorption fan to overhaul the desorption fan;
8) the air inlet of the adsorption area of the zeolite rotating wheel and the air outlet of the adsorption area of the zeolite rotating wheel are connected with an adsorption pressure difference monitoring device, and the adsorption pressure difference monitoring device is connected with the controller; when the controller judges that the pressure difference between the air inlet of the adsorption area and the air outlet of the adsorption area exceeds a preset range, stopping the machine, and overhauling the zeolite rotating wheel;
9) the gas inlet of the desorption area of the zeolite rotating wheel and the gas outlet of the desorption area of the zeolite rotating wheel are connected with a desorption pressure difference monitoring device, and the desorption pressure difference monitoring device is connected with the controller; when the controller judges that the pressure difference between the air inlet of the desorption area and the air outlet of the desorption area exceeds a preset range, stopping the machine, and overhauling the zeolite rotating wheel;
10) the automatic control system for VOCs waste gas treatment further comprises a filter, wherein an air outlet of the filter is connected with an air inlet of an adsorption zone of the zeolite rotating wheel; the filter comprises at least two layers of filtering parts which are arranged in sequence, a differential pressure monitoring device before and after filtering is connected between an inlet and an outlet of each layer of filtering part, and the differential pressure monitoring device before and after filtering is connected with the controller; when the controller judges that the pressure difference of the inlet and the outlet of any layer of filtering part exceeds the preset range, the shutdown operation is carried out, and the filtering part is overhauled to ensure the filtering efficiency.
The invention also relates to a using method of the automatic control system for VOCs waste gas treatment, which is characterized by comprising the following steps:
in an initial state, the controller controls the desorption fan to be started, the desorption fan drives gas in the first desorption pipeline to enter the reactor to react to form purified gas after being heated by the electric heater, and the purified gas discharged from the reactor is discharged to the gas inlet of the desorption area of the zeolite rotating wheel after passing through the purified gas cooling device; meanwhile, the controller controls the adsorption fan to be started, the adsorption fan drives the waste gas to enter an adsorption area of the zeolite rotating wheel, the zeolite in the zeolite rotating wheel adsorbs VOCs waste gas in the waste gas, and purified gas after adsorption treatment is discharged;
when VOCs gas adsorbed by zeolite in the desorption area is desorbed, the controller controls the turning wheel motor to be started, the turning wheel motor drives the zeolite turning wheel to rotate, so that the zeolite adsorbing VOCs waste gas rotates to the desorption area of the zeolite turning wheel, and the purified gas discharged by the purified gas cooling device desorbs the VOCs gas adsorbed on the zeolite in the desorption area; the desorption fan drives the desorbed concentrated VOCs waste gas to enter the reactor after being heated by the electric heater, and the desorbed concentrated VOCs waste gas reacts in the reactor to form purified gas; and the purified gas discharged from the reactor is discharged to the air inlet of the desorption area of the zeolite rotating wheel after passing through the purified gas cooling device.
The method of the system can realize automatic control of waste gas treatment, and the purified gas with heat is conveyed to the desorption area to desorb the VOCs waste gas adsorbed on the zeolite, so that the heat is recycled, and the energy waste is reduced.
Preferably, the use method of the automatic control system for the treatment of the VOCs waste gas comprises at least one of the following characteristics:
1) the automatic control system further comprises: the desorption inlet temperature monitoring device is connected with the controller and is arranged on an air inlet of a desorption area of the zeolite rotating wheel;
the use method of the automatic control system further comprises the following steps: the desorption inlet temperature monitoring device transmits the monitored temperature of the gas inlet of the desorption area to the controller;
when the controller judges that the temperature of the air inlet of the desorption area is lower than the preset desorption inlet safety temperature and exceeds the preset desorption inlet working temperature range, the controller controls the output power of the electric heater;
when the output power of the electric heater is adjusted, the controller stops controlling the output power of the electric heater when judging that the temperature of the air inlet of the desorption area reaches a preset desorption inlet working temperature range; when the controller judges that the temperature of the air inlet of the desorption area exceeds a preset desorption inlet working temperature range, the controller controls the rotating wheel motor to adjust the rotating speed of the zeolite rotating wheel;
after the rotating speed of the zeolite rotating wheel is adjusted, when the controller judges that the temperature of the air inlet of the desorption area reaches a preset desorption inlet working temperature range, the controller stops controlling the rotating wheel motor; when the controller judges that the temperature of the air inlet of the desorption area exceeds a preset desorption inlet working temperature range, the controller stops the machine;
when the controller judges that the temperature of the air inlet of the desorption area is higher than the preset desorption inlet safety temperature, the controller stops the machine;
2) the automatic control system further comprises: the reaction outlet temperature monitoring device is connected with the controller and arranged on the gas outlet of the reactor;
the use method of the automatic control system further comprises the following steps: a reaction outlet temperature monitoring device transmits the monitored temperature of the gas outlet of the reactor to the controller;
when the controller judges that the temperature of the gas outlet of the reactor is lower than the preset safe temperature of the reaction outlet and exceeds the preset working temperature range of the reaction outlet, the controller controls the output power of the electric heater;
after the output power of the electric heater is adjusted, when the controller judges that the temperature of the gas outlet of the reactor reaches a preset reaction outlet working temperature range, the controller stops controlling the output power of the electric heater; when the controller judges that the temperature of the gas outlet of the reactor exceeds a preset reaction outlet working temperature range, the controller controls the rotating wheel motor to adjust the rotating speed of the zeolite rotating wheel;
after the rotating speed of the zeolite rotating wheel is adjusted, when the controller judges that the temperature of the air outlet of the reactor reaches a preset reaction outlet working temperature range, the controller stops controlling the rotating wheel motor; when the controller judges that the temperature of the gas outlet of the reactor exceeds a preset reaction outlet working temperature range, the controller performs shutdown operation;
and when the controller judges that the temperature of the gas outlet of the reactor is higher than the preset safe temperature of the reaction outlet, the controller stops the operation.
The system can adjust the output power of the electric heater and the rotating speed of the zeolite rotating wheel according to the monitored temperature, so that the temperature in the system can be controlled more accurately.
Preferably, the automatic control system further comprises: the rotating wheel motion monitoring device and the desorption inlet temperature monitoring device are connected with the controller; the rotating wheel motion monitoring device is arranged on the zeolite rotating wheel; the desorption inlet temperature monitoring device is arranged on an air inlet of a desorption area of the zeolite rotating wheel;
the rotating wheel motion monitoring device transmits the monitored rotation period of the zeolite rotating wheel to the controller, and when the controller judges that the rotation period of the zeolite rotating wheel is increased, the controller firstly controls the electric heater to be closed; the desorption import temperature monitoring device will monitor the temperature of the air inlet in desorption district conveys the controller, works as the controller judges the temperature of the air inlet in desorption district is less than or equal to the minimum value of the desorption import operating temperature scope of predetermineeing, the controller control the desorption fan with the adsorption fan is closed.
Through the monitoring to the rotation cycle of zeolite runner, can guarantee the normal operating of zeolite runner. When the electric heater is turned off, the desorption fan and the adsorption fan are in a starting state, so that gas in a system pipeline can still circulate, and after the desorption fan and the adsorption fan gradually cool the gas, the controller controls the desorption fan and the adsorption fan to be turned off, so that the zeolite rotating wheel can be effectively prevented from being ignited.
Drawings
Fig. 1 is a schematic diagram of the external structure of a prior art VOCs exhaust treatment system.
Fig. 2 is a schematic diagram of a prior art VOCs exhaust treatment system.
Fig. 3 is a schematic structural diagram of an automatic control system for treating the VOCs in the present embodiment.
Fig. 4 is a schematic structural diagram of an automatic control system for treating the VOCs in the present embodiment.
Fig. 5 is a control schematic diagram of the automatic control system for the VOCs off-gas treatment according to the present embodiment.
Description of the element reference numerals
100 integrated box
110 air inlet pipe
120 exhaust pipe
200 air inlet fan
300 filtering device
400 zeolite runner device
410 adsorption zone
420 cooling zone
430 desorption zone
510 desorption fan
520 heater
530 regenerative incinerator
600 exhaust fan
1 zeolite wheel
101 adsorption zone
Gas outlet of 1011 adsorption zone
1012 air inlet of adsorption zone
102 desorption zone
1021 desorption zone's gas outlet
1022 air inlet of desorption area
2-wheel motor
3 adsorption fan
4 desorption fan
Air inlet of 41 desorption fan
42 desorption fan's gas outlet
5 first desorption pipeline
6 electric heater
61 air inlet of electric heater
62 air outlet of electric heater
7 reactor
71 gas inlet of reactor
72 gas outlet of the reactor
8 purified gas cooling device
81 purge gas inlet
82 purge gas outlet
83 waste gas inlet
84 waste gas outlet
9 air delivery branch
10 purge gas exhaust branch
11 second desorption pipeline
121 desorption inlet temperature monitoring device
122 reaction outlet temperature monitoring device
123 heat exchange temperature monitoring device
124 adsorb import temperature monitoring device
125 adsorption outlet temperature monitoring device
126 desorption outlet temperature monitoring device
127 internal temperature monitoring device
128 electric heating inlet temperature monitoring device
129 electric heating outlet temperature monitoring device
13 runner motion monitoring devices
14 controller
151 first frequency converter
152 second frequency converter
153 third frequency converter
161 adsorption differential pressure monitoring device
162 desorption differential pressure monitoring device
163 differential pressure monitoring devices before filtering
17 Filter
171 filter part
181 first control valve
182 second control valve
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions of the present disclosure, so that the present disclosure is not limited to the technical essence, and any modifications of the structures, changes of the ratios, or adjustments of the sizes, can still fall within the scope of the present disclosure without affecting the function and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description only, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention unless otherwise specified.
As shown in fig. 3 and 5, the present embodiment provides an automatic control system for the treatment of VOCs exhaust gas, comprising:
the zeolite runner 1, the zeolite runner 1 includes an adsorption zone 101 and a desorption zone 102;
the rotating wheel motor 2 is connected with the zeolite rotating wheel 1;
the adsorption fan 3 is connected with the adsorption area 101 of the zeolite rotating wheel 1;
the gas inlet 41 of the desorption fan 4 is connected with the gas outlet 1021 of the desorption area 102 of the zeolite rotating wheel 1 through the first desorption pipeline 5;
the air inlet 61 of the electric heater 6 is connected with the air outlet 42 of the desorption fan 4;
the gas inlet 71 of the reactor 7 is connected with the gas outlet 62 of the electric heater 6;
a purified gas inlet 81 of the purified gas cooling device 8 is connected with the gas outlet 72 of the reactor 7, and a purified gas outlet 82 of the purified gas cooling device 8 is connected with a gas inlet 1022 of the desorption area 102 of the zeolite rotating wheel 1 through a second desorption pipeline 11;
and the controller 14, the controller 14 is connected with the rotating wheel motor 2, the adsorption fan 3, the desorption fan 4, the electric heater 6, the reactor 7 and the purified gas cooling device 8.
In the automatic control system for treating the VOCs waste gas of the embodiment, in an initial state, the controller 14 controls the desorption fan 4 to be turned on, the desorption fan 4 drives the gas in the first desorption pipeline 5 to enter the reactor 7 to react to form purified gas after being heated by the electric heater 6, and the purified gas discharged from the reactor 7 is discharged to the gas inlet 1022 of the desorption region 102 of the zeolite rotating wheel 1 after passing through the purified gas cooling device 8; meanwhile, the controller 14 controls the adsorption fan 3 to be started, the adsorption fan 3 drives the VOCs waste gas to enter the adsorption area 101 of the zeolite rotating wheel 1, the VOCs waste gas is adsorbed by the zeolite in the zeolite rotating wheel 1, and purified gas after adsorption treatment is discharged; in an initial state, the gas in the first desorption pipeline 5 is VOCs waste gas in the air and the last residual VOCs waste gas;
the controller 14 controls the turning wheel motor 2 to be started, and the turning wheel motor 2 drives the zeolite turning wheel 1 to rotate, so that the zeolite adsorbing the VOCs waste gas rotates to the desorption area 102 of the zeolite turning wheel 1;
the desorption fan 4 drives the desorbed concentrated VOCs waste gas to enter the electric heater 6, the concentrated VOCs waste gas is heated by the electric heater 6 and then enters the reactor 7, and the desorbed concentrated VOCs waste gas reacts in the reactor 7 to form purified gas; because the temperature of the gas discharged from the reactor 7 is high, the purified gas discharged from the reactor 7 must pass through the purified gas cooling device 8 and then be discharged to the gas inlet 1022 of the desorption zone 102 of the zeolite rotating wheel 1, so as to desorb the VOCs waste gas adsorbed on the zeolite;
the system can realize automatic control of waste gas treatment, and can convey purified gas with heat to the desorption area 102 for cyclic utilization, thereby avoiding energy waste.
As shown in fig. 3 and 5, the automatic control system for the treatment of VOCs waste gas further comprises: and the desorption inlet temperature monitoring device 121 is connected with the controller 14, and the desorption inlet temperature monitoring device 121 is arranged on the air inlet 1022 of the desorption area 102 of the zeolite rotating wheel 1. The system can adjust the output power of the electric heater 6, or adjust the output power of the electric heater 6 and the rotating speed of the zeolite rotating wheel 1, or perform shutdown operation according to the temperature monitored by the desorption inlet temperature monitoring device 121.
VOCs exhaust-gas treatment's automatic control system still includes: and a reaction outlet temperature monitoring device 122 connected to the controller 14, wherein the reaction outlet temperature monitoring device 122 is disposed on the gas outlet 72 of the reactor 7. The system can adjust the output power of the electric heater 6, or adjust the output power of the electric heater 6 and the rotation speed of the zeolite rotating wheel 1, or perform shutdown operation according to the temperature monitored by the reaction outlet temperature monitoring device 122.
The automatic control system further comprises: a rotating wheel movement monitoring device 13 and a desorption inlet temperature monitoring device 121 which are connected with the controller 14; the rotating wheel motion monitoring device 13 is arranged on the zeolite rotating wheel 1; the desorption inlet temperature monitoring device 121 is disposed on the gas inlet 1022 of the desorption region 102 of the zeolite wheel 1.
According to the rotation period of the zeolite rotating wheel 1 monitored by the rotating wheel motion monitoring device 13, when the controller 14 judges that the rotation period of the zeolite rotating wheel 1 is increased, the zeolite rotating wheel 1 stops at a position, and the controller 14 stops the operation; the shutdown operation specifically comprises the following steps: the electric heater 6 is closed earlier to controller 14, desorption fan 4 and adsorption fan 3 are in the on-state when closing electric heater 6, make the gas in the system pipeline still can circulate like this, and desorption fan 4 and adsorption fan 3 make gaseous cooling down gradually, when desorption import temperature monitoring device 121 monitored the temperature of the air inlet 1022 of desorption district 102 less than or equal to the minimum of desorption import operating temperature scope, controller 14 again controls desorption fan 4 and adsorption fan 3 and closes, this just can prevent that zeolite runner 1 from igniting.
The automatic control system further comprises an air conveying branch 9, the air conveying branch 9 is connected with the first desorption pipeline 5, a first control valve 181 is arranged on the air conveying branch 9, and the first control valve 181 is connected with the controller 14. In this embodiment, the first control valve 181 is a negative pressure inlet valve, which can prevent the concentrated VOCs waste gas from being discharged from the air delivery branch 9.
The desorption fan 4 drives the desorbed concentrated VOCs waste gas and the air input to the first desorption pipeline 5 from the air conveying branch 9 to converge into the gas to be purified, the gas to be purified is heated by the electric heater 6 and then enters the reactor 7, and the gas to be purified reacts in the reactor 7 to form purified gas; purified gas discharged from the reactor 7 passes through the purified gas cooling device 8 and is discharged to the gas inlet 1022 of the desorption region 102 of the zeolite rotating wheel 1;
according to the temperature of the air inlet 1022 of the desorption region 102 monitored by the desorption inlet temperature monitoring device 121, the controller 14 controls the temperature of the electric heater 6 and controls the first control valve 181 so that the temperature of the air inlet 1022 of the desorption region 102 reaches a preset desorption inlet working temperature range; when the temperature of the gas inlet 1022 of the desorption area 102 is too high, the first control valve 181 is adjusted to be large, so that the temperature of the gas in the whole pipeline is reduced; or, according to the temperature of the outlet of the reactor 7 monitored by the reaction outlet temperature monitoring device 122, the controller 14 controls the electric heater 6 to adjust the output power, and controls the first control valve 181 to adjust the opening degree, so that the temperature of the outlet of the reactor 7 reaches the preset reaction outlet working temperature range; when the temperature at the outlet of the reactor 7 is too high, the first control valve 181 is adjusted to be large, so that the external cold air enters, and the temperature of the gas in the whole pipeline is reduced;
as shown in fig. 3 and 5, the automatic control system further includes a purge gas exhaust branch 10, the purge gas exhaust branch 10 is connected to the second desorption pipeline 11, a second control valve 182 is disposed on the purge gas exhaust branch 10, and the second control valve 182 is connected to the controller 14. In this embodiment, the second control valve 182 is an exhaust valve, and when the temperature of the gas in the second desorption pipeline 11 is too high, the gas in the second desorption pipeline 11 is exhausted through the second control valve 182.
According to the temperature of the air inlet 1022 of the desorption region 102 monitored by the desorption inlet temperature monitoring device 121, the controller 14 controls the second control valve 182 to make the temperature of the air inlet 1022 of the desorption region 102 reach the preset desorption inlet working temperature range while controlling the output power of the electric heater 6 to adjust the temperature; when the temperature of the gas inlet 1022 of the desorption region 102 is too high, the second control valve 182 is adjusted to be larger, so that more gas with heat is discharged, and the temperature of the gas in the whole pipeline is reduced; or, according to the temperature of the outlet of the reactor 7 monitored by the reaction outlet temperature monitoring device 122, the output power of the electric heater 6 is controlled by the controller 14 to adjust the temperature, and at the same time, the opening degree of the second control valve 182 is controlled to adjust the opening degree, so that the temperature of the outlet of the reactor 7 reaches the preset reaction outlet working temperature range; when the temperature at the outlet of the reactor 7 is too high, the second control valve 182 is adjusted to be larger, so that more gas with heat is discharged, and the temperature of the gas in the whole pipeline is reduced;
the system adjusts the opening degrees of the two valves in the system through the monitored temperature, so that the temperature in the system is more accurately controlled.
As shown in fig. 4 and 5, the purified gas cooling device 8 is a heat exchanger, the purified gas cooling device 8 is provided with a waste gas inlet 83 and a waste gas outlet 84, the waste gas inlet 83 is connected with the gas outlet 1021 of the desorption region 102 of the zeolite wheel 1, and the waste gas outlet 84 is connected with the gas inlet 41 of the desorption fan 4 through the first desorption pipeline 5. The purified gas and the waste gas exchange heat in the heat exchanger, so that the heat energy is recycled.
The purified gas inlet 81, the purified gas outlet 82, the waste gas inlet 83 and the waste gas outlet 84 are all provided with a heat exchange temperature monitoring device 123, and the heat exchange temperature monitoring device 123 is connected with the controller 14.
In this system, according to the temperature that each heat transfer temperature monitoring device 123 that acquires monitored, when controller 14 judges that the temperature variation after the purification gas heat transfer surpasses the preset range or the temperature variation after the waste gas heat transfer surpasses the preset range, controller 14 carries out the shutdown operation, overhauls purification gas heat sink 8 to guarantee purification gas heat sink 8 heat exchange efficiency.
As shown in fig. 4 and 5, the air inlet 1012 of the adsorption region 101 is provided with the adsorption inlet temperature monitoring device 124, the air outlet 1011 of the adsorption region 101 is provided with the adsorption outlet temperature monitoring device 125, and both the adsorption inlet temperature monitoring device 124 and the adsorption outlet temperature monitoring device 125 are connected with the controller 14; when the controller 14 judges that the gas temperature difference before and after adsorption exceeds the preset range, the controller 14 stops the operation to overhaul the zeolite rotating wheel 1, so that the adsorption and desorption efficiency of the zeolite rotating wheel 1 is ensured, and the adsorption and desorption of the zeolite rotating wheel 1 are ensured to be smooth.
A desorption outlet temperature monitoring device 126 is arranged at a gas outlet 1021 of the desorption area 102, and the desorption outlet temperature monitoring device 126 is connected with the controller 14; when the controller 14 determines that the temperature of the gas outlet 1021 of the desorption region 102 exceeds the preset desorption outlet safety temperature, the controller 14 stops to avoid the ignition of the zeolite rotating wheel 1 caused by the over-high temperature of the desorption region 102.
An internal temperature monitoring device 127 is arranged in the electric heater 6, and the internal temperature monitoring device 127 is connected with the controller 14; when the controller 14 judges that the temperature inside the electric heater 6 exceeds the preset inside safety temperature, the controller 14 performs a shutdown operation to prevent the electric heater 6 from being damaged due to the high temperature.
The air inlet 61 of the electric heater 6 is provided with an electric heating inlet temperature monitoring device 128, and the air outlet 62 of the electric heater 6 is provided with an electric heating outlet temperature monitoring device 129; both the electrically heated inlet temperature monitoring device 128 and the electrically heated outlet temperature monitoring device 129 are connected to the controller 14. When the controller 14 judges that the gas temperature difference before and after the electric heater 6 is heated exceeds the preset range, the controller 14 stops the operation to overhaul the electric heater 6 so as to ensure the heating performance of the electric heater 6 and prevent the electric heater 6 from being damaged due to high temperature;
the adsorption fan 3 is connected with the monitoring end of the first frequency converter 151, and the data output end of the first frequency converter 151 is connected with the controller 14; the first frequency converter 151 transmits the current data of the adsorption fan 3 to the controller 14, and when the controller 14 judges that the current of the adsorption fan 3 exceeds a preset range, the shutdown operation is performed to overhaul the adsorption fan 3.
The rotary wheel motor 2 is connected with the monitoring end of the second frequency converter 152, and the data output end of the second frequency converter 152 is connected with the controller 14; the second frequency converter 152 transmits the current data of the wheel motor 2 to the controller 14, and when the controller 14 determines that the current of the wheel motor 2 exceeds the preset range, the shutdown operation is performed to repair the wheel motor 2.
The desorption fan 4 is connected with the monitoring end of the third frequency converter 153, and the data output end of the third frequency converter 153 is connected with the controller 14; the third frequency converter 153 transmits the current data of the desorption fan 4 to the controller 14, and when the controller 14 determines that the current of the adsorption fan 4 exceeds the preset range, the shutdown operation is performed to overhaul the desorption fan 4.
The gas inlet 1012 of the adsorption area 101 of the zeolite rotating wheel 1 and the gas outlet 1011 of the adsorption area 101 of the zeolite rotating wheel 1 are connected with an adsorption pressure difference monitoring device 161, and the adsorption pressure difference monitoring device 161 is connected with a controller 14; when the controller 14 judges that the pressure difference between the air inlet 1012 of the adsorption region 101 and the air outlet 1011 of the adsorption region 101 exceeds a preset range, the operation is stopped, and the zeolite rotating wheel 1 is overhauled to ensure the adsorption and desorption efficiency.
The gas inlet 1022 of the desorption area 102 of the zeolite rotating wheel 1 and the gas outlet 1021 of the desorption area 102 of the zeolite rotating wheel 1 are connected with a desorption differential pressure monitoring device 162, and the desorption differential pressure monitoring device 162 is connected with the controller 14; when the controller 14 determines that the pressure difference between the air inlet 1022 of the desorption region 102 and the air outlet 1021 of the desorption region 102 exceeds the preset range, the operation is stopped to repair the zeolite rotating wheel 1, so as to ensure the adsorption and desorption efficiency.
The automatic control system for VOCs waste gas treatment further comprises a filter 17, wherein the air outlet of the filter 17 is connected with the air inlet 1012 of the adsorption zone 101 of the zeolite rotating wheel 1; the filter 17 includes at least two layers of filter portions 171 arranged in sequence, a differential pressure monitoring device 163 before and after filtration is connected between an inlet and an outlet of each layer of filter portion 171, and the differential pressure monitoring device 163 before and after filtration is connected with the controller 14. When the controller 14 determines that the pressure difference between the inlet and the outlet of any one layer of the filter 171 exceeds the preset range, the shutdown operation is performed to overhaul the filter 171, so as to ensure the filtering efficiency.
The embodiment also provides a using method of the automatic control system for VOCs waste gas treatment, which comprises the following steps:
in an initial state, the controller 14 controls the desorption fan 4 to be opened, the desorption fan 4 drives the gas in the first desorption pipeline 5 to enter the reactor 7 to react to form purified gas after being heated by the electric heater 6, and the purified gas discharged from the reactor 7 is discharged to the gas inlet 1022 of the desorption region 102 of the zeolite rotating wheel 1 after passing through the purified gas cooling device 8; meanwhile, the controller 14 controls the adsorption fan 3 to be started, the adsorption fan 3 drives the waste gas to enter the adsorption area 101 of the zeolite rotating wheel 1, the zeolite in the zeolite rotating wheel 1 adsorbs the VOCs waste gas in the waste gas, and the purified gas after adsorption treatment is discharged;
when the VOCs gas adsorbed by the zeolite in the desorption area 102 is desorbed, the controller 14 controls the turning wheel motor 2 to be started, the turning wheel motor 2 drives the zeolite turning wheel 1 to rotate, so that the zeolite adsorbing the VOCs waste gas rotates to the desorption area 102 of the zeolite turning wheel 1, and the purified gas discharged by the purified gas cooling device 8 desorbs the VOCs gas adsorbed on the zeolite in the desorption area 102; the desorption fan 4 drives the desorbed concentrated VOCs waste gas to be heated by the electric heater 6 and then enter the reactor 7, and the desorbed concentrated VOCs waste gas reacts in the reactor 7 to form purified gas; the purified gas discharged from the reactor 7 passes through the purified gas cooling device 8 and is discharged to the gas inlet 1022 of the desorption region 102 of the zeolite wheel 1.
The method of the system can realize automatic control of waste gas treatment, and the purified gas with heat is conveyed to the desorption area 102 so as to desorb the VOCs waste gas adsorbed on the zeolite, thereby realizing cyclic utilization of heat and reducing waste of energy.
The automatic control system for VOCs exhaust-gas treatment also includes: the desorption inlet temperature monitoring device 121 is connected with the controller 14, and the desorption inlet temperature monitoring device 121 is arranged on the air inlet 1022 of the desorption region 102 of the zeolite rotating wheel 1;
the use method of the automatic control system for VOCs waste gas treatment further comprises the following steps: the desorption inlet temperature monitoring device 121 communicates the monitored temperature of the gas inlet 1022 of the desorption zone 102 to the controller 14;
when the controller 14 determines that the temperature of the air inlet 1022 of the desorption region 102 is lower than the preset desorption inlet safety temperature and exceeds the preset desorption inlet working temperature range, the controller 14 controls the output power of the electric heater 6;
when the output power of the electric heater 6 is adjusted, and the controller 14 determines that the temperature of the air inlet 1022 of the desorption region 102 reaches the preset desorption inlet working temperature range, the controller 14 stops controlling the output power of the electric heater 6; when the controller 14 determines that the temperature of the air inlet 1022 of the desorption region 102 exceeds the preset desorption inlet working temperature range, the controller 14 controls the rotating wheel motor 2 to adjust the rotating speed of the zeolite rotating wheel 1;
after the rotation speed of the zeolite rotating wheel 1 is adjusted, when the controller 14 determines that the temperature of the air inlet 1022 of the desorption area 102 reaches the preset desorption inlet working temperature range, the controller 14 stops controlling the rotating wheel motor 2; when the controller 14 determines that the temperature of the air inlet 1022 of the desorption region 102 exceeds the preset desorption inlet working temperature range, the controller 14 performs a shutdown operation;
when the controller 14 determines that the temperature of the air inlet 1022 of the desorption region 102 is higher than the preset desorption inlet safety temperature, the controller 14 performs a shutdown operation;
the preset desorption inlet safety temperature is greater than the maximum value of the preset desorption inlet working temperature, in this embodiment, the preset desorption inlet safety temperature is 100 ℃, and the preset desorption inlet working temperature range is 50-57 ℃. The system can firstly adjust the output power of the electric heater 6 and then adjust the rotating speed of the zeolite rotating wheel 1 according to the monitored temperature of the air inlet 1022 of the desorption area 102 of the zeolite rotating wheel 1, so that the temperature of the air inlet 1022 of the desorption area 102 in the system can be more accurately controlled.
The automatic control system for VOCs exhaust-gas treatment also includes: a reaction outlet temperature monitoring device 122 connected to the controller 14, the reaction outlet temperature monitoring device 122 being disposed on the gas outlet 72 of the reactor 7;
the use method of the automatic control system further comprises the following steps: the reaction outlet temperature monitoring device 122 transmits the monitored temperature of the gas outlet 72 of the reactor 7 to the controller 14;
when the controller 14 judges that the temperature of the air outlet 72 of the reactor 7 is lower than the preset safe temperature of the reaction outlet and exceeds the preset working temperature range of the reaction outlet, the controller 14 controls the output power of the electric heater 6;
after the output power of the electric heater 6 is adjusted, when the controller 14 judges that the temperature of the air outlet 72 of the reactor 7 reaches the preset reaction outlet working temperature range, the controller 14 stops controlling the output power of the electric heater 6; when the controller 14 judges that the temperature of the air outlet 72 of the reactor 7 exceeds the preset reaction outlet working temperature range, the controller 14 controls the rotating wheel motor 2 to adjust the rotating speed of the zeolite rotating wheel 1;
after the rotating speed of the zeolite rotating wheel 1 is adjusted, when the controller 14 judges that the temperature of the air outlet 72 of the reactor 7 reaches the preset reaction outlet working temperature range, the controller 14 stops controlling the rotating wheel motor 2; when the controller 14 judges that the temperature of the air outlet 72 of the reactor 7 exceeds the preset reaction outlet working temperature range, the controller 14 carries out shutdown operation;
when the controller 14 judges that the temperature of the gas outlet 72 of the reactor 7 is higher than the preset reaction outlet safety temperature, the controller 14 performs a shutdown operation.
The preset safe temperature of the reaction outlet is greater than the maximum value of the preset safe temperature of the reaction outlet, in this embodiment, the preset safe temperature of the desorption inlet is 450 ℃, and the preset working temperature range of the desorption inlet is 330-. The system can firstly adjust the output power of the electric heater 6 and then adjust the rotating speed of the zeolite rotating wheel 1 according to the monitored temperature of the air outlet 72 of the reactor 7, so that the temperature of the air outlet 72 of the reactor 7 in the system can be more accurately controlled.
The automatic control system further comprises: a rotating wheel movement monitoring device 13 and a desorption inlet temperature monitoring device 121 which are connected with the controller 14; the rotating wheel motion monitoring device 13 is arranged on the zeolite rotating wheel 1; the desorption inlet temperature monitoring device 121 is arranged on the air inlet 1022 of the desorption region 102 of the zeolite rotating wheel 1;
the rotating wheel movement monitoring device 13 transmits the monitored rotation period of the zeolite rotating wheel 1 to the controller 14, and when the controller 14 judges that the rotation period of the zeolite rotating wheel 1 is increased, the controller 14 controls the electric heater 6 to be turned off firstly; the desorption inlet temperature monitoring device 121 transmits the monitored temperature of the air inlet 1022 of the desorption region 102 to the controller 14, and when the controller 14 determines that the temperature of the air inlet 1022 of the desorption region 102 is less than or equal to the minimum value of the preset desorption inlet working temperature range, the controller 14 controls the desorption fan 4 and the adsorption fan 3 to be turned off.
Through the monitoring to the rotation cycle of zeolite runner 1, can guarantee the normal operating of zeolite runner 1. The desorption fan 4 and the adsorption fan 3 are in the starting state when the electric heater 6 is turned off, so that the gas in the system pipeline can still circulate, and the desorption fan 4 and the adsorption fan 3 gradually cool the gas, when the controller 14 judges that the temperature of the gas inlet 1022 of the desorption area 102 is less than or equal to the minimum value of the preset desorption inlet working temperature range, the controller 14 controls the desorption fan 4 and the adsorption fan 3 to be turned off again, and the zeolite rotating wheel 1 can be effectively prevented from igniting.
The automatic control system for VOCs waste gas treatment and the use method thereof can realize automatic continuous treatment of VOCs waste gas, and the automatic control system can operate safely, stably and effectively and realize unattended operation.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. An automatic control system for VOCs exhaust treatment, comprising:
a zeolite wheel (1), the zeolite wheel (1) comprising an adsorption zone (101) and a desorption zone (102);
the rotating wheel motor (2) is connected with the zeolite rotating wheel (1);
the adsorption fan (3) is connected with the adsorption area (101) of the zeolite rotating wheel (1);
the gas inlet (41) of the desorption fan (4) is connected with the gas outlet (1021) of the desorption area (102) of the zeolite rotating wheel (1) through a first desorption pipeline (5);
the air inlet (61) of the electric heater (6) is connected with the air outlet (42) of the desorption fan (4);
a reactor (7), wherein the air inlet (71) of the reactor (7) is connected with the air outlet (62) of the electric heater (6); a purified gas inlet (81) of the purified gas cooling device (8) is connected with a gas outlet (72) of the reactor (7), and a purified gas outlet (82) of the purified gas cooling device (8) is connected with a gas inlet (1022) of a desorption area (102) of the zeolite rotating wheel (1) through a second desorption pipeline (11);
the controller (14), the controller (14) with runner motor (2), adsorption fan (3), desorption fan (4), electric heater (6), reactor (7) and purified gas heat sink (8) are connected.
2. An automated control system for the treatment of VOCs in accordance with claim 1, comprising at least one of the following features:
1) the automatic control system further comprises: the desorption inlet temperature monitoring device (121) is connected with the controller (14), and the desorption inlet temperature monitoring device (121) is arranged on a gas inlet (1022) of the desorption area (102) of the zeolite rotating wheel (1);
2) the automatic control system further comprises: and the reaction outlet temperature monitoring device (122) is connected with the controller (14), and the reaction outlet temperature monitoring device (122) is arranged on the air outlet (72) of the reactor (7).
3. The automated system of claim 1, further comprising: a rotating wheel movement monitoring device (13) and a desorption inlet temperature monitoring device (121) which are connected with the controller (14); the rotating wheel motion monitoring device (13) is arranged on the zeolite rotating wheel (1); the desorption inlet temperature monitoring device (121) is arranged on a gas inlet (1022) of the desorption area (102) of the zeolite rotating wheel (1).
4. An automated control system for the treatment of VOCs in accordance with claim 2 or 3, comprising at least one of the following features:
1) the automatic control system further comprises an air conveying branch (9), the air conveying branch (9) is connected with the first desorption pipeline (5), a first control valve (181) is arranged on the air conveying branch (9), and the first control valve (181) is connected with the controller (14);
2) the automatic control system further comprises a purified gas exhaust branch (10), the purified gas exhaust branch (10) is connected with the second desorption pipeline (11), a second control valve (182) is arranged on the purified gas exhaust branch (10), and the second control valve (182) is connected with the controller (14).
5. An automated control system for the treatment of VOCs as recited in claim 1, wherein:
the clean gas cooling device (8) is a heat exchanger, a waste gas inlet (83) and a waste gas outlet (84) are arranged on the clean gas cooling device (8), the waste gas inlet (83) is connected with a gas outlet (1021) of a desorption area (102) of the zeolite rotating wheel (1), and the waste gas outlet (84) is connected with a gas inlet (41) of the desorption fan (4) through the first desorption pipeline (5).
6. An automatic control system for VOCs exhaust gas treatment according to claim 5, wherein the purge gas inlet (81), the purge gas outlet (82), the exhaust gas inlet (83) and the exhaust gas outlet (84) are each provided with a heat exchange temperature monitoring device (123), and the heat exchange temperature monitoring device (123) is connected with the controller (14).
7. An automated control system for the treatment of VOCs in accordance with claim 1, comprising at least one of the following features:
1) an adsorption inlet temperature monitoring device (124) is arranged at a gas inlet (1012) of the adsorption area (101), an adsorption outlet temperature monitoring device (125) is arranged at a gas outlet (1011) of the adsorption area (101), and the adsorption inlet temperature monitoring device (124) and the adsorption outlet temperature monitoring device (125) are both connected with the controller (14);
2) a desorption outlet temperature monitoring device (126) is arranged at a gas outlet (1021) of the desorption area (102), and the desorption outlet temperature monitoring device (126) is connected with the controller (14);
3) an internal temperature monitoring device (127) is arranged in the electric heater (6), and the internal temperature monitoring device (127) is connected with the controller (14);
4) an electric heating inlet temperature monitoring device (128) is arranged at the air inlet (61) of the electric heater (6), and an electric heating outlet temperature monitoring device (129) is arranged at the air outlet (62) of the electric heater (6); the electric heating inlet temperature monitoring device (128) and the electric heating outlet temperature monitoring device (129) are both connected with the controller (14);
5) the adsorption fan (3) is connected with a monitoring end of a first frequency converter (151), and a data output end of the first frequency converter (151) is connected with the controller (14);
6) the rotating wheel motor (2) is connected with a monitoring end of a second frequency converter (152), and a data output end of the second frequency converter (152) is connected with the controller (14);
7) the desorption fan (4) is connected with a monitoring end of a third frequency converter (153), and a data output end of the third frequency converter (153) is connected with the controller (14);
8) the gas inlet (1012) of the adsorption area (101) of the zeolite rotating wheel (1) and the gas outlet (1011) of the adsorption area (101) of the zeolite rotating wheel (1) are connected with an adsorption pressure difference monitoring device (161), and the adsorption pressure difference monitoring device (161) is connected with the controller (14);
9) the gas inlet (1022) of the desorption area (102) of the zeolite rotating wheel (1) and the gas outlet (1021) of the desorption area (102) of the zeolite rotating wheel (1) are connected with a desorption differential pressure monitoring device (162), and the desorption differential pressure monitoring device (162) is connected with the controller (14);
10) the automatic control system for VOCs waste gas treatment further comprises a filter (17), wherein the air outlet of the filter (17) is connected with the air inlet (1012) of the adsorption zone (101) of the zeolite rotating wheel (1); the filter (17) comprises at least two layers of filter parts (171) which are arranged in sequence, a front-back filtering pressure difference monitoring device (163) is connected between an inlet and an outlet of each layer of filter part (171), and the front-back filtering pressure difference monitoring device (163) is connected with the controller (14).
8. A method of using the automated control system for the treatment of exhaust gases from VOCs as recited in claim 1, comprising the steps of:
in an initial state, the controller (14) controls the desorption fan (4) to be started, the desorption fan (4) drives gas in the first desorption pipeline (5) to enter the reactor (7) to react to form purified gas after being heated by the electric heater (6), and the purified gas discharged from the reactor (7) is discharged to the gas inlet (1022) of the desorption area (102) of the zeolite rotating wheel (1) after passing through the purified gas cooling device (8); meanwhile, the controller (14) controls the adsorption fan (3) to be started, the adsorption fan (3) drives the waste gas to enter an adsorption area (101) of the zeolite rotating wheel (1), the zeolite in the zeolite rotating wheel (1) adsorbs VOCs waste gas in the waste gas, and purified gas after adsorption treatment is discharged;
when VOCs gas adsorbed by zeolite in the desorption zone (102) is desorbed, the controller (14) controls the turning wheel motor (2) to be started, the turning wheel motor (2) drives the zeolite turning wheel (1) to rotate, so that the zeolite adsorbing VOCs waste gas rotates to the desorption zone (102) of the zeolite turning wheel (1), and the VOCs gas adsorbed on the zeolite in the desorption zone (102) is desorbed by purified gas discharged by the purified gas cooling device (8); the desorption fan (4) drives the desorbed concentrated VOCs waste gas to be heated by the electric heater (6) and then enter the reactor (7), and the desorbed concentrated VOCs waste gas reacts in the reactor (7) to form purified gas; purified gas discharged from the reactor (7) passes through a purified gas cooling device (8) and then is discharged to a gas inlet (1022) of a desorption area (102) of the zeolite rotating wheel (1).
9. The method of using an automated control system for the treatment of waste gases containing VOCs as claimed in claim 8, wherein: including at least one of the following features:
1) the automatic control system further comprises: the desorption inlet temperature monitoring device (121) is connected with the controller (14), and the desorption inlet temperature monitoring device (121) is arranged on a gas inlet (1022) of the desorption area (102) of the zeolite rotating wheel (1);
the use method of the automatic control system further comprises the following steps: a desorption inlet temperature monitoring device (121) communicates the monitored temperature of the gas inlet (1022) of the desorption zone (102) to the controller (14);
when the controller (14) judges that the temperature of the air inlet (1022) of the desorption area (102) is lower than a preset desorption inlet safety temperature and exceeds a preset desorption inlet working temperature range, the controller (14) controls the output power of the electric heater (6);
when the output power of the electric heater (6) is adjusted, the controller (14) stops controlling the output power of the electric heater (6) when the controller (14) judges that the temperature of the air inlet (1022) of the desorption area (102) reaches a preset desorption inlet working temperature range; when the controller (14) judges that the temperature of the air inlet (1022) of the desorption area (102) exceeds a preset desorption inlet working temperature range, the controller (14) controls the rotating wheel motor (2) to adjust the rotating speed of the zeolite rotating wheel (1);
after the rotating speed of the zeolite rotating wheel (1) is adjusted, when the controller (14) judges that the temperature of the air inlet (1022) of the desorption area (102) reaches a preset desorption inlet working temperature range, the controller (14) stops controlling the rotating wheel motor (2); when the controller (14) judges that the temperature of the air inlet (1022) of the desorption area (102) exceeds a preset desorption inlet working temperature range, the controller (14) performs shutdown operation;
when the controller (14) judges that the temperature of the air inlet (1022) of the desorption area (102) is higher than a preset desorption inlet safety temperature, the controller (14) performs shutdown operation;
2) the automatic control system further comprises: a reaction outlet temperature monitoring device (122) connected to the controller (14), the reaction outlet temperature monitoring device (122) being disposed on the gas outlet (72) of the reactor (7);
the use method of the automatic control system further comprises the following steps: a reaction outlet temperature monitoring device (122) transmits the monitored temperature of the gas outlet (72) of the reactor (7) to the controller (14);
when the controller (14) judges that the temperature of the gas outlet (72) of the reactor (7) is lower than a preset reaction outlet safety temperature and exceeds a preset reaction outlet working temperature range, the controller (14) controls the output power of the electric heater (6);
after the output power of the electric heater (6) is adjusted, when the controller (14) judges that the temperature of the gas outlet (72) of the reactor (7) reaches a preset reaction outlet working temperature range, the controller (14) stops controlling the output power of the electric heater (6); when the controller (14) judges that the temperature of the air outlet (72) of the reactor (7) exceeds a preset reaction outlet working temperature range, the controller (14) controls the rotating wheel motor (2) to adjust the rotating speed of the zeolite rotating wheel (1);
after the rotating speed of the zeolite rotating wheel (1) is adjusted, when the controller (14) judges that the temperature of the air outlet (72) of the reactor (7) reaches a preset reaction outlet working temperature range, the controller (14) stops controlling the rotating wheel motor (2); when the controller (14) judges that the temperature of the air outlet (72) of the reactor (7) exceeds a preset reaction outlet working temperature range, the controller (14) performs shutdown operation;
when the controller (14) judges that the temperature of the gas outlet (72) of the reactor (7) is higher than the preset reaction outlet safety temperature, the controller (14) carries out shutdown operation.
10. The method of using an automated control system for the treatment of waste gases containing VOCs as claimed in claim 8, wherein: the automatic control system further comprises: a rotating wheel movement monitoring device (13) and a desorption inlet temperature monitoring device (121) which are connected with the controller (14); the rotating wheel motion monitoring device (13) is arranged on the zeolite rotating wheel (1); the desorption inlet temperature monitoring device (121) is arranged on a gas inlet (1022) of the desorption area (102) of the zeolite rotating wheel (1);
the rotating wheel motion monitoring device (13) transmits the monitored rotation period of the zeolite rotating wheel (1) to the controller (14), and when the controller (14) judges that the rotation period of the zeolite rotating wheel (1) is increased, the controller (14) controls the electric heater (6) to be turned off firstly; the desorption inlet temperature monitoring device (121) is used for monitoring the temperature of the gas inlet (1022) of the desorption area (102) and transmitting the monitored temperature to the controller (14), and when the controller (14) judges that the temperature of the gas inlet (1022) of the desorption area (102) is smaller than or equal to the minimum value of a preset desorption inlet working temperature range, the controller (14) is used for controlling the desorption fan (4) and the adsorption fan (3) to be closed.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113877363A (en) * | 2021-09-14 | 2022-01-04 | 徐州徐工施维英机械有限公司 | Low-concentration VOCs waste gas energy-saving treatment method and device |
| CN116371144A (en) * | 2023-04-10 | 2023-07-04 | 苏州市环境保护有限公司 | Treatment method of zeolite rotating wheel equipment in treatment of spraying waste gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113877363A (en) * | 2021-09-14 | 2022-01-04 | 徐州徐工施维英机械有限公司 | Low-concentration VOCs waste gas energy-saving treatment method and device |
| CN116371144A (en) * | 2023-04-10 | 2023-07-04 | 苏州市环境保护有限公司 | Treatment method of zeolite rotating wheel equipment in treatment of spraying waste gas |
| CN116371144B (en) * | 2023-04-10 | 2024-01-05 | 苏州市环境保护有限公司 | Treatment method of zeolite rotating wheel equipment in treatment of spraying waste gas |
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