CN109308082A - Low Temperature Plasma Treating sewage collecting, storage, processing links release gas in VOCs method of controlling security - Google Patents
Low Temperature Plasma Treating sewage collecting, storage, processing links release gas in VOCs method of controlling security Download PDFInfo
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- CN109308082A CN109308082A CN201711133623.6A CN201711133623A CN109308082A CN 109308082 A CN109308082 A CN 109308082A CN 201711133623 A CN201711133623 A CN 201711133623A CN 109308082 A CN109308082 A CN 109308082A
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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Abstract
The invention discloses a kind of Low Temperature Plasma Treating sewage collectings, storage, processing links discharge the method for controlling security of VOCs in gas, steps are as follows: using the technological parameter of VOCs in technological parameter transmitter real-time detection exhaust gas conveying main pipeline, exhaust gas conveying main pipeline is connected to sewage collecting, storage, between treatment facility and reaction of low temperature plasma device, the signal that technological parameter transmitter will test passes to logic controller, after logic controller analyzes signal, movement is opened and closed in instruction actuator, the actuator includes plasma reactor entrance stop valve and plasma reactor power supply relay.The present invention is by combining reliable control system and crucial control parameter, form the method for controlling security of a set of control plasma treatment VOCs technical process, guarantee during using plasma discharge treatment VOCs, pass through the key safeties technological parameter such as strict control flow, concentration, humidity and temperature, it avoids hazard factor from generating, meets safety requirements.
Description
Technical field
The present invention relates to sewage collecting, storage, processing links to discharge gas disposal field, and in particular at low temperature plasma
Manage sewage collecting, storage, processing links release gas in VOCs method of controlling security.
Background technique
The sewage that industrial processes generate meeting loss in collection, storage, processing goes out a small amount of VOCs gas, main component
For benzene homologues, alkane, alkene etc..Benzene homologues in exhaust gas are carcinogen, and peculiar smell is obvious, and alkane and alkene etc. belong to inflammable
Substance improves plant area's air quality, builds environmentally protective production environment, sewage need to be arranged to protect employee's health
Pond emission-control equipment, tail gas after processing is up to standard, then high altitude discharge.
There are many kinds of the methods of VOCs processing, wherein lower temperature plasma technology processing VOCs be a kind for the treatment of effeciency it is high,
The low technology of operating cost, but low temperature plasma belongs to electrion, can ignite or ignite certain under certain condition
The VOCs substance of concentration, there are the danger of fire and explosion.
The process unit of existing low-temperature plasma processing VOCs, is not analyzed for the risk for the treatment of process,
Also special security control scheme is not designed and developed according to the risk of technical process, therefore existing low-temperature plasma is handled
Sewage collecting, storage, in processing links release gas VOCs device blast accident frequent occurrence, brought to sewage treatment plant very big
Risk.Due to not safe and reliable air distribution and interlock system, the technique of existing plasma treatment exhaust gas be only capable of using
The very low occasion of exhaust gas VOCs content, using limited, although the considered critical use scope of low VOCs concentration, due to upstream
The source of process spent water is complicated, and composition transfer is big, it is possible to VOCs excessive concentration occurs, more than the feelings of process design consideration
Condition causes the technique of existing plasma treatment VOC exhaust gas to there is very big security risk.
Summary of the invention
Based on above-mentioned technical problem, the present invention provides a kind of Low Temperature Plasma Treating sewage collecting, storage, processing links
Discharge the method for controlling security of VOCs in gas.
The adopted technical solution is that:
A kind of Low Temperature Plasma Treating sewage collecting, storage, in processing links release gas VOCs method of controlling security,
Steps are as follows: using the technological parameter of VOCs in technological parameter transmitter real-time detection exhaust gas conveying main pipeline, exhaust gas conveying master
Pipeline is connected between cesspool and reaction of low temperature plasma device, and the signal that technological parameter transmitter will test passes to logic
Controller, after logic controller analyzes signal, movement is opened and closed in instruction actuator, and the actuator includes plasma reactor
Entrance stop valve and plasma reactor power supply relay.
Preferably, air distribution pipeline is connected on exhaust gas conveying main pipeline, exhaust gas conveying main pipeline also passes through a shunt valve
Road connects exhaust tube, and the actuator further includes being mounted on air flow control valve and bypass stop valve with air flow control valve
On air distribution pipeline, bypass stop valve is mounted on bypass duct.
Preferably, the technological parameter transmitter includes that consistency transmitter, humidity transmitter, flow transmitter and temperature become
Device is sent, wherein on exhaust gas conveying main pipeline, temperature transmitter is set for consistency transmitter, humidity transmitter and flow transmitter setting
It sets in the bottom of reaction of low temperature plasma device.
Preferably, the consistency transmitter includes exhaust gas VOCs consistency transmitter and gaseous mixture VOCs consistency transmitter, is given up
Gas VOCs consistency transmitter is used to detect the concentration of entrance exhaust gas VOCs in exhaust gas conveying main pipeline, and gaseous mixture VOCs concentration becomes
Send device for detecting the concentration of gaseous mixture VOCs after exhaust gas is mixed with air distribution.
Preferably, the consistency transmitter further includes surrounding air VOCs consistency transmitter, for detecting in surrounding air
The concentration of VOCs.
Preferably, the actuator further includes exhaust flow regulating valve, and it is defeated that the exhaust flow regulating valve is mounted on exhaust gas
It send on main pipeline.
Preferably, the consistency transmitter is examined using flame ion (FID) detector or photoionization detector (PID)
Device or combustible gas alarming instrument are surveyed, flow transmitter uses vortex flow transmitter or orifice plate flow transmitter, humidity pick-up
Device is inserted into humidity sensor using condenser type, and temperature transmitter uses thermocouple, thermal resistance (metal) and semiconductor thermistor,
The consistency transmitter, flow transmitter, humidity transmitter and temperature transmitter are on exhaust gas conveying main pipeline along gas flow
It is sequentially arranged before and after direction.
Above-mentioned Low Temperature Plasma Treating sewage collecting, storage, processing links release gas in VOCs method of controlling security,
Specifically sequentially include the following steps:
Step 1: successively detecting the tail gas VOCs concentration from cesspool by technological parameter transmitter, mix with air
The concentration of VOCs afterwards mixes the flow of VOCs after air distribution, into reaction of low temperature plasma device before mix the humidity of VOCs, and
The temperature of mixing VOCs in reaction of low temperature plasma device；
Step 2: exceeding in first step testing process if any parameter or lower than setting value, logic controller is then immediately
It sends signal and passes to actuator execution corresponding actions.
In the step 1: the testing process of technological parameter is cyclic process, if technological parameter transmitter letter detected
Number without abnormal, then circulating repetition detects.
Above-mentioned Low Temperature Plasma Treating sewage collecting, storage, processing links release gas in VOCs method of controlling security,
Detailed step is as follows:
(1) exhaust gas conveying main pipeline inner exhaust gas VOCs concentration is detected using tail gas VOCs consistency transmitter, if tail
The concentration of VOCs is beyond setting range in logic controller in gas, then logic controller sends signal designation and cuts off plasma reaction
Device entrance stop valve and plasma reactor power supply relay, and bypass stop valve is opened, pass through the VOCs tail gas of high concentration
Bypass duct is discharged into exhaust tube；
(2) if the concentration of VOCs is in logic controller setting range in tail gas, become by gaseous mixture VOCs concentration
Send device to detect gaseous mixture VOCs concentration after air distribution, when gaseous mixture VOCs concentration exceed logic controller setting range, then
It is adjusted by logic controller and matches air flow control valve, gaseous mixture VOCs concentration is adjusted to setting range；
(3) VOCs concentration in environment is detected using surrounding air VOCs consistency transmitter, if VOCs is dense in environment
Degree exceeds setting range, logic controller control cutting plasma reactor entrance stop valve and plasma reactor power supply relay
Device, and bypass stop valve is opened, exhaust gas is conveyed into the gaseous mixture in main pipeline and imports exhaust tube；
(4) mixed gas flow is detected using flow transmitter, if exceeding setting range, logic controller is sent
Signal designation cuts off plasma reactor entrance stop valve and plasma reactor power supply relay, and opens bypass stop valve,
Exhaust gas is conveyed into the gaseous mixture in main pipeline and imports exhaust tube；If entering lower step Humidity Detection without departing from setting range；
(5) gaseous mixture humidity is detected using humidity transmitter, if exceeding setting range, logic controller is sent
Signal designation cuts off plasma reactor entrance stop valve and plasma reactor power supply relay, and opens bypass stop valve,
Exhaust gas is conveyed into the gaseous mixture in main pipeline and imports exhaust tube；If entering lower step temperature detection without departing from setting range；
(6) temperature of reaction of low temperature plasma device during processing mixes VOCs is examined using temperature transmitter
It surveys, if exceeding setting range, logic controller sends signal designation cutting plasma reactor entrance stop valve and plasma
Reactor power supply relay, and bypass stop valve is opened, exhaust gas is conveyed into the gaseous mixture in main pipeline and imports exhaust tube；If not surpassing
Setting range out, then reactor is normally carried out.
The method have the benefit that:
The present invention proposes a set of method of controlling security, and this method is according to certain logic input and output, by sensor, logic
The control system of controller and the constraint of actuator composed structure, the control system have very high reliability and safety.This hair
It is bright by the way that reliable control system and crucial control parameter are combined, form a set of control plasma treatment VOCs technique mistake
The method of controlling security of journey guarantees during using plasma discharge treatment VOCs, by strict control flow, concentration,
The key safeties technological parameter such as humidity and temperature, avoids hazard factor from generating, meets safety requirements.
Detailed description of the invention
Fig. 1 is the principle schematic diagram of device involved by method of controlling security of the present invention；
Fig. 2 is that method of controlling security of the present invention illustrates the Low Temperature Plasma Treating VOCs process for carrying out monitoring and protecting
Figure.
Specific embodiment
In the technique of Low Temperature Plasma Treating VOCs, since sewage collecting, storage, processing links release gas generate
VOCs fluctuation of concentration it is very big, often exceed the lower explosion limit of fuel gas, and plasma treatment process can inherently generate a little
Fire source, therefore the accident for being easy to occurrence of equipment burning using plasma treatment process and exploding.
Based on the above security risk, it is dirty that the present invention provides a set of high reliability, the Low Temperature Plasma Treating of high security
Water collect, storage, processing links release gas in VOCs method of controlling security, using plasma process handle VOCs when pass through
Strict control enters flow, concentration, humidity, reactor outlet temperature and the processing dress of the exhaust gas of reaction of low temperature plasma device
The concentration for setting within battery limit combustible gas around ensures that the process conditions meet safety requirements.
The security control side of VOCs in progress Low Temperature Plasma Treating sewage collecting, storage, processing links release gas
Before method is introduced, first the safety control that the method for the present invention is based on is described in detail.
Low Temperature Plasma Treating sewage collecting, storage, the safety control of VOCs includes in processing links release gas
Multiple sensors, actuator and logic controller, by the flow of VOCs in real-time detection Low Temperature Plasma Treating module, dense
The parameters such as degree, humidity and temperature, by the control system of interlocking, by parameter value control in level of security, once parameter is beyond just
Standing definite value, cuts off corresponding stop valve immediately, closes plasma reactor power supply, remaining VOCs is fed through exhaust tube,
The formation of risk factor is avoided, the risk of fire explosion and poisoning is reduced.
The sensor of safety control include consistency transmitter (consistency transmitter of VOCs containing environment), humidity transmitter,
Flow transmitter, temperature transmitter etc.；The actuator of device includes reaction of low temperature plasma device, regulating valve, stop valve, air inducing
Machine, relay etc..In addition to environment VOCs concentration detector, other sensors are arranged on exhaust-gas treatment main line, each sensor
The signal that will test passes to logic controller, after signal is analyzed in logic controller processing, is accordingly held by interlock system instruction
Row device carries out cutting and on-off action.
Safety control plasma treatment sewage collecting, storage, processing links release gas in VOCs during,
By industrial online fid detector real-time detection VOCs concentration, VOCs concentration is more than 25% and VOCs of exhaust gas lower explosion limit dense
The degree rate of climb just needs to open with air valve when being more than 100ppm/s, and is adjusted by flow control valve and match wind flow, control
The rising of VOCs concentration avoids the formation of explosive atmosphere, and reaction of low temperature plasma device entrance VOCs concentration reaches under explosion
Limit 25% when it is necessary to cut off reaction of low temperature plasma device inlet valve immediately, open simultaneously bypass valve, cutoff process exhaust gas
Inlet valve closes reactor power supply, high concentration VOCs air-flow is discharged into exhaust tube, avoids imflammable gas in plasma reaction
It explodes in device.
Online flow detection meter in safety control, when detecting exhaust gas flow lower than setting value, cutting charging is cut
Disconnected valve, and plasma reactor power supply is cut off, exhaust gas is discharged into exhaust tube by bypass.On-line checking waste gas humidity is arranged in device
Transmitter feeds stop valve before being switched off reactor, simultaneously when plug-in type humidity transmitter detects moisture signal more than setting value
Bypass valve is opened, high humility exhaust gas is discharged into exhaust tube, while cutting off reactor power supply.
The bottom of reaction of low temperature plasma device is arranged in temperature transmitter, monitors the temperature of reactor, reactor on-line
Temperature rises, and more than 60 DEG C, closes dehumidifier and plasma reactor, and feeds stop valve before cutting off reactor, opens other
Mixing VOCs is discharged into exhaust tube by road.
Above-mentioned apparatus analyzes and determines technological fluctuation by the way that a set of technological parameter transmitter is arranged and formulates crucial control logic
Trend, deviate meeting certain technological parameter and in the case that technique may cause danger, drive stop valve and regulating valve
Cutting process is executed, the generation of fire and explosion accident is avoided.
With reference to the accompanying drawing to the peace of VOCs in Low Temperature Plasma Treating sewage collecting, storage, processing links release gas
The specific embodiment of full control device is described in detail.
As shown in Figure 1, a kind of Low Temperature Plasma Treating sewage collecting, storage, processing links release gas in VOCs peace
Full control device, including for real-time detection VOCs technological parameter technological parameter transmitter, for executing holding for on-off action
Row device and logic controller, technological parameter transmitter are connect with executor circuit, and actuator is connect with logic controller circuitry, work
The signal that skill parameter transmitter will test passes to logic controller, and after logic controller analyzes signal, instruction actuator is carried out
On-off action.
The technological parameter transmitter includes consistency transmitter, humidity transmitter 6, flow transmitter 5 and temperature transmitter
7, wherein consistency transmitter, humidity transmitter 6 and the setting of flow transmitter 5 are in connection cesspool and reaction of low temperature plasma device
Exhaust gas conveying main pipeline on.The bottom of reaction of low temperature plasma device is arranged in temperature transmitter 7.Main pipeline is conveyed in exhaust gas
On be connected with air distribution pipeline, exhaust gas conveying main pipeline also passes through bypass line and connects exhaust tube.The consistency transmitter includes
For detect exhaust gas conveying main pipeline in entrance exhaust gas VOCs concentration exhaust gas VOCs consistency transmitter 1 and for detecting exhaust gas
The gaseous mixture VOCs consistency transmitter 2 of gaseous mixture VOCs concentration after being mixed with air distribution.
The actuator includes with air flow control valve 4, plasma reactor entrance stop valve 10, bypass 9 and of stop valve
Plasma reactor power supply relay 11 is mounted on air distribution pipeline with air flow control valve 4, the cutting of plasma reactor entrance
Valve 10 is mounted on exhaust gas conveying main pipeline, and is located at plasma reactor inlet, and bypass stop valve 9 is mounted on bypass duct
On.
The consistency transmitter, humidity transmitter, flow transmitter and temperature transmitter are connect with logic controller, are patrolled
Controller is collected to be separately connected with air flow control valve, plasma reactor entrance stop valve, bypass stop valve and plasma reaction
Device power supply relay.
The consistency transmitter further includes the surrounding air VOCs concentration pick-up for detecting VOCs concentration in surrounding air
Device 8, surrounding air VOCs consistency transmitter 8 are connect with logic controller.The actuator further includes exhaust flow regulating valve 3,
The exhaust flow regulating valve 3 is mounted on exhaust gas conveying main pipeline, and is located at inlet.
Low Temperature Plasma Treating module mainly includes that the exhaust gas of cesspool enters the useless of reaction of low temperature plasma device
Reaction of low temperature plasma device gas conveying main pipeline and handled exhaust gas, it is important that exhaust gas conveys main pipeline setting two
It is useless respectively to carry out VOCs abnormal parameters in the air distribution pipeline and processing module of air distribution to the exhaust gas from cesspool for tap line
Gas keeps in the bypass duct of exhaust tube.In addition to surrounding air VOCs consistency transmitter, the sensor setting of safety control exists
Exhaust gas conveys on main pipeline, includes with parameters, the sensors of control device such as the concentration, humidity, flow and the temperature that detect VOCs
Consistency transmitter, humidity transmitter, flow transmitter and temperature transmitter etc..
Consistency transmitter uses the FID detector or PID monitor or combustible gas alarming instrument highly sensitive to organic matter,
Concentration detector is arranged on the pipeline that exhaust gas enters plasma reactor, on tail gas and the mixed pipeline of air distribution air respectively
VOCs consistency transmitter, it is whether exceeded to detect VOCs content of different nature.To ensure Low Temperature Plasma Treating module ring
The concentration of VOCs will not be damaged and be lost to personnel and equipment in border, setting air concentration detector in processing module, and one
VOCs concentration reaches lower explosion limit in denier environment, and logic controller cuts off charging immediately, shuts down reactor power supply etc., prevents accident
Occur.
The device is using the high-quality reliable performance vortex flow transmitter of quality or orifice plate flow transmitters sense VOCs
Flow, flow transmitter are arranged on the pipeline after mixing VOCs concentration sensor, the concentration to be checked for measuring VOCs, flow ginseng
After number is without departing from safe range, the condenser type insertion humidity sensor on main line will test VOCs humidity parameter, to ensure
Waste gas humidity into plasma reactor is up to standard, the occasionally thermal resistance of the thermoelectricity on main line (metal) or semiconductor thermistor
Temperature transmitter will test temperature parameter, to ensure that plasma reactor outlet exhaust temperature is up to standard.
The signal of the acquisition of all the sensors will be passed to logic controller and carry out signal analysis, and logic controller is using event
Hinder trigger-type, logic controller is by the signals such as the concentration being collected into, humidity, flow or temperature and the phase that is arranged in controller
Answer pre-set parameter to be compared analysis, once discovery exceed or lower than setting value parameter, according to the signal type of collection,
Respective actuators are communicated information to immediately to carry out the movement such as cutting off, and risk factor is avoided to be formed.
The actuator of safety control includes reaction of low temperature plasma device, regulating valve, stop valve, air-introduced machine, relay
Device etc..Since VOCs contains corrosive substance, regulating valve and stop valve all use the pneumatic butterfly of performance stabilization, anti-corrosion anticracking
Valve.Wherein exhaust flow regulating valve is arranged in VOCs air inlet main line, and air flow control valve, two adjustings are matched in the setting of aid distributing pipe road
Valve adjusts exhaust gas flow according to the VOCs concentration from cesspool, so that mixing VOCs concentration is in safe range, avoids flammable
Property gas concentration reaches lower explosion limit.When VOCs abnormal parameters, before logic controller drives reaction of low temperature plasma device first
Stop valve cut off charging, then open bypass stop valve, the VOCs of abnormal level be discharged into exhaust tube, fire occurs for avoiding device
The accidents such as explosion.
Low Temperature Plasma Treating sewage collecting of the present invention, storage, in processing links release gas VOCs security control side
Method, general steps are as follows: using the technological parameter of VOCs in technological parameter transmitter real-time detection exhaust gas conveying main pipeline, exhaust gas
Conveying main pipeline is connected between cesspool and reaction of low temperature plasma device, the signal transmitting that technological parameter transmitter will test
To logic controller, after logic controller analyzes signal, movement is opened and closed in instruction actuator, and the actuator includes plasma
Reactor inlet stop valve and plasma reactor power supply relay.
Specifically sequentially include the following steps:
Step 1: successively detecting the tail gas VOCs concentration from cesspool by technological parameter transmitter, mix with air
The concentration of VOCs afterwards mixes the flow of VOCs after air distribution, into reaction of low temperature plasma device before mix the humidity of VOCs, and
The temperature of mixing VOCs in reaction of low temperature plasma device；
Step 2: exceeding in first step testing process if any parameter or lower than setting value, logic controller is then immediately
It sends signal and passes to actuator execution corresponding actions.
In step 1: the testing process of technological parameter is cyclic process, if technological parameter transmitter signal detected does not have
There is exception, then circulating repetition detects.
More specifically, it sequentially includes the following steps:
(1) exhaust gas conveying main pipeline inner exhaust gas VOCs concentration is detected using tail gas VOCs consistency transmitter, if tail
The concentration of VOCs is beyond setting range in logic controller in gas, then logic controller sends signal designation and cuts off plasma reaction
Device entrance stop valve and plasma reactor power supply relay, and bypass stop valve is opened, pass through the VOCs tail gas of high concentration
Bypass duct is discharged into exhaust tube；
(2) if the concentration of VOCs is in logic controller setting range in tail gas, become by gaseous mixture VOCs concentration
Send device to detect gaseous mixture VOCs concentration after air distribution, when gaseous mixture VOCs concentration exceed logic controller setting range, then
It is adjusted by logic controller and matches air flow control valve, gaseous mixture VOCs concentration is adjusted to setting range；
(3) VOCs concentration in environment is detected using surrounding air VOCs consistency transmitter, if VOCs is dense in environment
Degree exceeds setting range, logic controller control cutting plasma reactor entrance stop valve and plasma reactor power supply relay
Device, and bypass stop valve is opened, exhaust gas is conveyed into the gaseous mixture in main pipeline and imports exhaust tube；
(4) mixed gas flow is detected using flow transmitter, if exceeding setting range, logic controller is sent
Signal designation cuts off plasma reactor entrance stop valve and plasma reactor power supply relay, and opens bypass stop valve,
Exhaust gas is conveyed into the gaseous mixture in main pipeline and imports exhaust tube；If entering lower step Humidity Detection without departing from setting range；
(5) gaseous mixture humidity is detected using humidity transmitter, if exceeding setting range, logic controller is sent
Signal designation cuts off plasma reactor entrance stop valve and plasma reactor power supply relay, and opens bypass stop valve,
Exhaust gas is conveyed into the gaseous mixture in main pipeline and imports exhaust tube；If entering lower step temperature detection without departing from setting range；
(6) temperature of reaction of low temperature plasma device during processing mixes VOCs is examined using temperature transmitter
It surveys, if exceeding setting range, logic controller sends signal designation cutting plasma reactor entrance stop valve and plasma
Reactor power supply relay, and bypass stop valve is opened, exhaust gas is conveyed into the gaseous mixture in main pipeline and imports exhaust tube；If not surpassing
Setting range out, then reactor is normally carried out.
It is illustrated with reference to the accompanying drawing.
As shown in Fig. 2, method of controlling security of the present invention is main to the testing process of VOCs are as follows:
Step 1: tail gas VOCs concentration of the detection from cesspool；
Step 2: detection mixes with air the concentration of rear VOCs；
Step 3: mixing the flow of VOCs after detection air distribution；
Step 4: detection enters the humidity of mixing VOCs before reaction of low temperature plasma device；
Step 5: mixing the temperature of VOCs in detection reaction of low temperature plasma device.
There is parameter to exceed in above-mentioned testing process in any step or lower than setting value, logic controller sends letter immediately
It number passes to actuator and executes corresponding actions.The testing process is cyclic process, if the signal of control device inner sensor detection
Without abnormal, control device will perform the next step control logic.
Low Temperature Plasma Treating sewage collecting of the present invention, storage, in processing links release gas VOCs security control side
The specific implementation of method is:
By installing tail gas VOCs consistency transmitter 1 on the air inlet pipeline of Low Temperature Plasma Treating tail gas containing VOCs,
Analyze the content of VOCs total hydrocarbon in exhaust gas；Logic controller in concentration signal feeder is simultaneously compared with setting value, when dense
After degree signal is greater than the set value and the concentration rate of climb is greater than the set value, logic controller drive on air distribution pipeline with distinguished and admirable
Adjustable valve 4 is opened, and to the tail gas air distribution into processing unit, while being adjusted exhaust flow regulating valve 3, is reduced the dense of VOCs
Degree, avoids imflammable gas concentration from reaching lower explosion limit.
It is opened and closed with air flow control valve 4 according to the Signal Regulation of mixture strength transmitter, meanwhile, surrounding air VOCs is dense
When degree detector 8 detects that the VOCs of ambient concentration reaches lower explosion limit setting value, stop air distribution, air flow control valve is matched in cutting
4。
Gaseous mixture VOCs consistency transmitter 2 of the mixed gas through main line after air distribution, detects VOCs concentration, and concentration is greater than
When the dangerous setting value upper limit, plasma reactor entrance stop valve 10 and upstream surge tank stop valve are cut off, and open bypass
Stop valve 9, high concentration VOCs exhaust gas are directly over bypass and are discharged into exhaust tube.
Mixed airflow transmitter 5 on main line is used to analyze the flow of gaseous mixture VOCs, and flow signal is sent into control
Device is made comparisons with setting value, and when flow signal is less than setting value, controller sends the cutting charging of signal designation material inlet valve, is beaten
It begins to rehearse into the bypass stop valve 9 of exhaust tube, the gaseous mixture VOCs of low discharge is directly discharged into exhaust tube by bypass.
Acquisition signal is sent to logic controller to humidity transmitter 6 on main line in real time, and logic controller receives wet
After spending signal, gaseous mixture humidity is greater than the set value, logic controller driving output electrical relay R001 closes plasma
The power supply of reactor, while plasma reactor entrance stop valve 10 is cut off, and open bypass stop valve 9, the VOCs of high humility
Exhaust gas is directly over bypass and is discharged into exhaust tube.
The temperature transmitter 7 of plasma reactor lower part acquires signal and sends logic controller to, and logic controller receives
It is more than setting value to reaction temperature after temperature signal, logic controller drives output-response device power supply relay R001, closes
The power supply of plasma reactor, and entrance stop valve is cut off, bypass stop valve 9 is opened, mixing VOCs is imported into By-pass vent cylinder.
The concrete application that method of controlling security of the present invention carries out monitoring and protecting to Low Temperature Plasma Treating VOCs is real
Under such as:
Exhaust gas from cesspool enters reaction of low temperature plasma device through exhaust gas conveying main pipeline, and the tail gas containing VOCs is first
First through on main pipeline tail gas VOCs consistency transmitter carry out tail gas VOCs concentration analysis, if in tail gas VOCs concentration be higher than patrol
The 25% of the lower explosion limit set in controller is collected, control system sends being fed into for signal designation cutting upstream surge tank immediately
Mouth valve, simultaneously turns off blowing system and air-introduced machine, cuts off the inlet valve and power supply of plasma reactor, and open bypass and cut
Disconnected valve, makes the VOCs tail gas of high concentration be discharged into exhaust tube by bypass, the VOCs of excessive concentrations is avoided to be gathered in reactor, increases
Add the risk fired.
If in tail gas VOCs consistency transmitter acquire concentration number be lower than lower explosion limit 25%, tail gas VOCs will with come from
The air of air distribution pipeline be mixed to form mixing VOCs, gaseous mixture VOCs concentration by the road on mixture strength transmitter acquire letter
It number is sent into logic controller and is analyzed, when mixing VOCs concentration is greater than the 25% of lower explosion limit, and examined through control logic
The mixture strength rate of climb be greater than 100ppm/s, if at this time surrounding air VOCs concentration detector detection environment in VOCs
For concentration not in lower explosion limit, i.e., adjustable air distribution flow control valve turns down the concentration of gaseous mixture in pipeline.If VOCs in environment
Concentration is higher than lower explosion limit, and control system cuts off material inlet valve immediately, closes plasma reactor power supply, and opening bypass will pipe
Gaseous mixture in road imports exhaust tube, in addition, control system is held when the value of mixing VOCs concentration rise detection is less than 100ppm/s
Row same action.
Gaseous mixture VOCs or concentration by air distribution are less than 25% VOCs exhaust gas of lower explosion limit by mixed gas flow
Transmitters sense outflow, gaseous mixture is sent to humidity transmitter through pipeline when being greater than the set value, and is less than the mixing of setting value
Gas causes mistakenly stop vehicle to avoid generating measurement error due to flowed fluctuation, and mixing VOCs need to carry out again flow inspection after 10s is stagnated
Survey, the flow detected at this time still less than setting value gaseous mixture, system according to judge by transmission signal designation associated actuator hold
The operation such as the relevant cutting of row and opening bypass, otherwise, into lower step Humidity Detection.
Into the gaseous mixture of Humidity Detection, it just can enter when humidity is lower than setting value and carry out exhaust gas in plasma reactor
Processing, and the unqualified mixing VOCs for being higher than setting value executes shutdown reactor power supply, cutting reaction after system logic judges
Device inlet valve opens bypass for high humility VOCs and is discharged into exhaust tube, simultaneously closes off air-introduced machine.
The temperature of reaction of low temperature plasma device meeting real-time monitoring VOCs during the mixing VOCs of processing, temperature are less than
60 DEG C are safe operating temperature, and system is normally carried out；When temperature is greater than 60 DEG C, logic controller sends signal designation and closes reaction
Device power supply and inlet valve open bypass, close air-introduced machine, prevent temperature of reactor is excessively high from causing fire explosion.
Above-mentioned Low Temperature Plasma Treating sewage collecting, storage, processing links release gas in VOCs method of controlling security,
It can also be applied to the processing of technology waste gas or uncontrollable discharge exhaust gas etc..
It should be noted that above-described embodiment is only presently preferred embodiments of the present invention, can not be used to limit the present invention
Protection scope, the equivalent substitution or substitution made based on the above technical solution or simple conversion should belong to
Protection scope of the present invention.
Claims (10)
1. a kind of Low Temperature Plasma Treating sewage collecting, storage, processing links release gas in VOCs method of controlling security,
It is characterized in that steps are as follows: using the technological parameter of VOCs in technological parameter transmitter real-time detection exhaust gas conveying main pipeline, giving up
Gas conveying main pipeline is connected between cesspool and reaction of low temperature plasma device and reaction of low temperature plasma device and exhaust tube
Between, the signal that technological parameter transmitter will test passes to logic controller, and after logic controller analyzes signal, instruction is executed
Movement is opened and closed in device, and the actuator includes plasma reactor entrance stop valve and plasma reactor power supply relay.
2. a kind of Low Temperature Plasma Treating sewage collecting according to claim 1, storage, processing links discharge in gas
The method of controlling security of VOCs, it is characterised in that: be connected with air distribution pipeline on exhaust gas conveying main pipeline, exhaust gas conveys main pipeline
Exhaust tube is also connected by bypass line, the actuator further includes with air flow control valve and bypass stop valve, with distinguished and admirable
Adjustable valve is mounted on air distribution pipeline, and bypass stop valve is mounted on bypass duct.
3. a kind of Low Temperature Plasma Treating sewage collecting according to claim 1 or 2, storage, processing links discharge gas
The method of controlling security of middle VOCs, it is characterised in that: the technological parameter transmitter include consistency transmitter, humidity transmitter,
Flow transmitter and temperature transmitter, wherein consistency transmitter, humidity transmitter and flow transmitter setting are conveyed in exhaust gas and are led
On pipeline, the bottom of reaction of low temperature plasma device is arranged in temperature transmitter.
4. a kind of Low Temperature Plasma Treating sewage collecting according to claim 3, storage, processing links discharge in gas
The method of controlling security of VOCs, it is characterised in that: the consistency transmitter includes exhaust gas VOCs consistency transmitter and gaseous mixture
VOCs consistency transmitter, exhaust gas VOCs consistency transmitter be used for detect exhaust gas conveying main pipeline in entrance exhaust gas VOCs it is dense
Degree, gaseous mixture VOCs consistency transmitter are used to detect the concentration of gaseous mixture VOCs after exhaust gas is mixed with air distribution.
5. a kind of Low Temperature Plasma Treating sewage collecting according to claim 3, storage, processing links discharge in gas
The method of controlling security of VOCs, it is characterised in that: the consistency transmitter further includes surrounding air VOCs consistency transmitter, is used for
Detect the concentration of VOCs in surrounding air.
6. a kind of Low Temperature Plasma Treating sewage collecting according to claim 1, storage, processing links discharge in gas
The method of controlling security of VOCs, it is characterised in that: the actuator further includes exhaust flow regulating valve, and the exhaust flow is adjusted
Valve is mounted on exhaust gas conveying main pipeline.
7. a kind of Low Temperature Plasma Treating sewage collecting according to claim 1, storage, processing links discharge in gas
The method of controlling security of VOCs, it is characterised in that: the consistency transmitter is detected using flame ionization detector, photoionization
Device or combustible gas alarming instrument, flow transmitter use vortex flow transmitter or orifice plate flow transmitter, humidity transmitter
Humidity sensor is inserted into using condenser type, the consistency transmitter, flow transmitter and humidity transmitter are conveyed in exhaust gas and be responsible for
It is sequentially arranged before and after gas flow direction on road.
8. a kind of Low Temperature Plasma Treating sewage collecting according to claim 3, storage, processing links discharge in gas
The method of controlling security of VOCs, it is characterised in that sequentially include the following steps:
Step 1: it is dense successively to detect the VOCs in sewage collecting, storage, processing links release gas by technological parameter transmitter
Degree, mixes with air the concentration of rear VOCs, and the flow of VOCs is mixed after air distribution, into reaction of low temperature plasma device before mix
The temperature of mixing VOCs in the humidity and reaction of low temperature plasma device of VOCs；
Step 2: exceeding if any parameter in first step testing process or being lower than setting value, logic controller is then sent immediately
Signal passes to actuator and executes corresponding actions.
9. a kind of Low Temperature Plasma Treating sewage collecting according to claim 8, storage, processing links discharge in gas
The method of controlling security of VOCs, which is characterized in that in the step 1: the testing process of technological parameter is cyclic process, if work
Skill parameter transmitter signal detected is without abnormal, then circulating repetition detects.
10. a kind of Low Temperature Plasma Treating sewage collecting according to claim 3, storage, processing links discharge in gas
The method of controlling security of VOCs, it is characterised in that specifically sequentially include the following steps:
(1) exhaust gas conveying main pipeline inner exhaust gas VOCs concentration is detected using tail gas VOCs consistency transmitter, if in tail gas
The concentration of VOCs is beyond setting range in logic controller, then logic controller transmission signal designation cutting plasma reactor enters
Mouth stop valve and plasma reactor power supply relay, and bypass stop valve is opened, make the VOCs tail gas of high concentration by bypass
Pipeline is discharged into exhaust tube；
(2) if the concentration of VOCs is in logic controller setting range in tail gas, pass through gaseous mixture VOCs consistency transmitter
Gaseous mixture VOCs concentration after air distribution is detected, when gaseous mixture VOCs concentration exceed logic controller setting range, then pass through
Logic controller, which is adjusted, matches air flow control valve, and gaseous mixture VOCs concentration is adjusted to setting range；
(3) VOCs concentration in environment is detected using surrounding air VOCs consistency transmitter, if VOCs concentration is super in environment
Setting range out, logic controller control cutting plasma reactor entrance stop valve and plasma reactor power supply relay,
And bypass stop valve is opened, exhaust gas is conveyed into the gaseous mixture in main pipeline and imports exhaust tube；
(4) mixed gas flow is detected using flow transmitter, if exceeding setting range, logic controller sends signal
Instruction cutting plasma reactor entrance stop valve and plasma reactor power supply relay, and bypass stop valve is opened, it will give up
Gas conveys the gaseous mixture in main pipeline and imports exhaust tube；If entering lower step Humidity Detection without departing from setting range；
(5) gaseous mixture humidity is detected using humidity transmitter, if exceeding setting range, logic controller sends signal
Instruction cutting plasma reactor entrance stop valve and plasma reactor power supply relay, and bypass stop valve is opened, it will give up
Gas conveys the gaseous mixture in main pipeline and imports exhaust tube；If entering lower step temperature detection without departing from setting range；
(6) temperature of reaction of low temperature plasma device during processing mixes VOCs is detected using temperature transmitter,
If exceeding setting range, logic controller sends signal designation cutting plasma reactor entrance stop valve and plasma reaction
Device power supply relay, and bypass stop valve is opened, exhaust gas is conveyed into the gaseous mixture in main pipeline and imports exhaust tube；If without departing from setting
Determine range, then reactor is normally carried out.
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Effective date of registration: 20211103 Address after: No. 22, Chaoyangmen street, Chaoyang District, Beijing 100020 Applicant after: CHINA PETROLEUM & CHEMICAL Corp. Applicant after: Sinopec Safety Engineering Research Institute Co.,Ltd. Address before: Yanan City, Shandong province Qingdao City three road 266071 No. 218 Applicant before: CHINA PETROLEUM & CHEMICAL Corp. Applicant before: SINOPEC Research Institute OF SAFETY ENGINEERING |
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