CN109308082B - Safety control method for VOCs in released gas in low-temperature plasma treatment sewage collection, storage and treatment links - Google Patents
Safety control method for VOCs in released gas in low-temperature plasma treatment sewage collection, storage and treatment links Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
- G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
Abstract
The invention discloses a safe control method for VOCs in released gas in the processes of collecting, storing and treating sewage in low-temperature plasma treatment, which comprises the following steps: the technical parameters of VOCs in the waste gas conveying main pipeline are detected in real time by adopting a technical parameter transmitter, the waste gas conveying main pipeline is connected between a sewage collecting, storing and treating facility and a low-temperature plasma reactor, the detected signals are transmitted to a logic controller by the technical parameter transmitter, and after the logic controller analyzes the signals, an actuator is indicated to perform opening and closing actions and comprises a plasma reactor inlet stop valve and a plasma reactor power supply relay. The invention combines a reliable control system with key control parameters to form a set of safety control method for controlling the process of treating the VOCs by the plasma, thereby ensuring that the generation of harmful factors is avoided and the safety requirement is met by strictly controlling the key safety process parameters such as flow, concentration, humidity, temperature and the like in the process of treating the VOCs by using plasma discharge.
Description
Technical Field
The invention relates to the field of gas release treatment in sewage collection, storage and treatment links, in particular to a safety control method for VOCs in gas release in sewage collection, storage and treatment links in low-temperature plasma treatment.
Background
During collection, storage and treatment of sewage generated in the industrial production process, a small amount of VOCs gas can be dissipated, and the main components of the sewage are benzene series, alkane, alkene and the like. Benzene series in the waste gas is carcinogenic substance, and the peculiar smell is obvious, and alkane and alkene etc. belong to inflammable substance, in order to protect staff's health, improve factory air quality, build green's production environment, need set up effluent water sump exhaust treatment device, the tail gas after handling is up to standard, then high altitude emission.
There are many methods for treating VOCs, wherein the low-temperature plasma technology is a technology with high treatment efficiency and low operation cost, but the low-temperature plasma belongs to high-voltage discharge, and can ignite or detonate VOCs with certain concentration under certain conditions, so that fire and explosion risks exist.
The conventional process device for treating VOCs by using low-temperature plasma does not analyze the risk of the treatment process, and does not design and develop a special safety control scheme according to the risk of the process, so that the conventional device for treating VOCs in gas in the processes of collecting, storing and treating sewage by using low-temperature plasma often has explosion accidents, and brings great risk to a sewage treatment plant. Because of the absence of safe and reliable air distribution and interlocking systems, the existing process for treating waste gas by plasma can only be used in occasions with very low content of VOCs in waste gas, the application is limited, and although the application range of low concentration of VOCs is strictly limited, the situation that the concentration of VOCs is too high and exceeds the process design condition can still occur due to the complex source and great component change of upstream process sewage, so that the existing process for treating VOC waste gas by plasma has great potential safety hazard.
Disclosure of Invention
Based on the technical problems, the invention provides a safe control method for VOCs in released gas in the low-temperature plasma treatment sewage collection, storage and treatment links.
The technical solution adopted by the invention is as follows:
a safe control method for VOCs in released gas in low-temperature plasma treatment sewage collection, storage and treatment links comprises the following steps: the technical parameters of VOCs in the waste gas conveying main pipeline are detected in real time by adopting a technical parameter transmitter, the waste gas conveying main pipeline is connected between a sewage pool and a low-temperature plasma reactor, the detected signals are transmitted to a logic controller by the technical parameter transmitter, and after the logic controller analyzes the signals, an actuator is indicated to perform opening and closing actions and comprises a plasma reactor inlet stop valve and a plasma reactor power supply relay.
Preferably, be connected with the air distribution pipeline on the main pipeline of waste gas transportation, the main pipeline of waste gas transportation still connects the aiutage through a bypass pipeline, the executor still includes air distribution flow control valve and bypass trip valve, and air distribution flow control valve installs on the air distribution pipeline, and the bypass trip valve is installed on the bypass pipeline.
Preferably, the process parameter transmitter comprises a concentration transmitter, a humidity transmitter, a flow transmitter and a temperature transmitter, wherein the concentration transmitter, the humidity transmitter and the flow transmitter are arranged on the main exhaust gas conveying pipeline, and the temperature transmitter is arranged at the bottom of the low-temperature plasma reactor.
Preferably, the concentration changer includes waste gas VOCs concentration changer and gas mixture VOCs concentration changer, and waste gas VOCs concentration changer is used for detecting the concentration of the interior import department waste gas VOCs of waste gas trunk line, and gas mixture VOCs concentration changer is used for detecting the concentration of waste gas and the post-mixed gas mixture VOCs of joining in marriage the wind.
Preferably, the concentration transmitter further comprises an ambient air VOCs concentration transmitter for detecting the concentration of VOCs in ambient air.
Preferably, the actuator further comprises an exhaust gas flow regulating valve, and the exhaust gas flow regulating valve is installed on the main exhaust gas conveying pipeline.
Preferably, the concentration transmitter adopts a Flame Ionization (FID) detector or a photoionization detector (PID) detector or a combustible gas alarm, the flow transmitter adopts a vortex flow transmitter or a perforated plate type flow transmitter, the humidity transmitter adopts a capacitance type inserted humidity sensor, the temperature transmitter adopts a thermocouple, a thermal resistor (metal) and a semiconductor thermistor, and the concentration transmitter, the flow transmitter, the humidity transmitter and the temperature transmitter are sequentially arranged on the main waste gas conveying pipeline along the gas flow direction.
The safety control method for VOCs in released gas in the low-temperature plasma treatment sewage collection, storage and treatment links specifically comprises the following steps:
the first step is as follows: sequentially detecting the concentration of VOCs in tail gas from a sewage tank, the concentration of VOCs after mixing with air, the flow rate of mixed VOCs after air distribution, the humidity of the mixed VOCs before entering a low-temperature plasma reactor and the temperature of the mixed VOCs in the low-temperature plasma reactor by a process parameter transmitter;
the second step is that: if the parameter exceeds or is lower than the set value in the first step of detection process, the logic controller immediately sends a signal to the actuator to execute corresponding action.
In the first step: the detection flow of the process parameters is a cyclic process, and if the signals detected by the process parameter transmitter are not abnormal, the detection is repeated cyclically.
The safety control method for VOCs in released gas in the low-temperature plasma treatment sewage collection, storage and treatment links comprises the following detailed steps:
(1) detecting the concentration of the tail gas VOCs in the main waste gas conveying pipeline by using a tail gas VOCs concentration transmitter, if the concentration of the VOCs in the tail gas exceeds a set range in a logic controller, sending a signal to the logic controller to instruct to cut off a plasma reactor inlet cut-off valve and a plasma reactor power supply relay, and opening a bypass cut-off valve to discharge the high-concentration VOCs tail gas into an exhaust funnel through a bypass pipeline;
(2) if the concentration of VOCs in the tail gas is within the set range of the logic controller, detecting the concentration of VOCs in the mixed gas after air distribution through a mixed gas VOCs concentration transmitter, and adjusting an air distribution flow regulating valve through the logic controller to regulate the concentration of VOCs in the mixed gas to the set range when the concentration of VOCs in the mixed gas exceeds the set range of the logic controller;
(3) detecting the concentration of VOCs in the environment by adopting a surrounding air VOCs concentration transmitter, if the concentration of VOCs in the environment exceeds a set range, controlling and cutting off a plasma reactor inlet cut-off valve and a plasma reactor power supply relay by a logic controller, opening a bypass cut-off valve, and introducing mixed gas in a waste gas conveying main pipeline into an exhaust funnel;
(4) detecting the flow of the mixed gas by adopting a flow transmitter, if the flow exceeds a set range, sending a signal to indicate and cut off a plasma reactor inlet cut-off valve and a plasma reactor power supply relay by a logic controller, opening a bypass cut-off valve, and introducing the mixed gas in a waste gas conveying main pipeline into an exhaust funnel; if the humidity does not exceed the set range, the next step of humidity detection is carried out;
(5) detecting the humidity of the mixed gas by adopting a humidity transmitter, if the humidity exceeds a set range, sending a signal to indicate and cut off a plasma reactor inlet cut-off valve and a plasma reactor power supply relay by a logic controller, opening a bypass cut-off valve, and guiding the mixed gas in a waste gas conveying main pipeline into an exhaust funnel; if the temperature does not exceed the set range, entering the next temperature detection;
(6) detecting the temperature of the low-temperature plasma reactor in the process of treating the mixed VOCs by using a temperature transmitter, if the temperature exceeds a set range, sending a signal to indicate to cut off a plasma reactor inlet cut-off valve and a plasma reactor power supply relay by a logic controller, opening a bypass cut-off valve, and introducing the mixed gas in a waste gas conveying main pipeline into an exhaust funnel; if the set range is not exceeded, the reactor is normally operated.
The beneficial technical effects of the invention are as follows:
the invention provides a set of safety control method, which is characterized in that a sensor, a logic controller and an actuator form a control system with structural constraint according to certain logic input and output, and the control system has high reliability and safety. The invention combines a reliable control system with key control parameters to form a set of safety control method for controlling the process of treating the VOCs by the plasma, thereby ensuring that the generation of harmful factors is avoided and the safety requirement is met by strictly controlling the key safety process parameters such as flow, concentration, humidity, temperature and the like in the process of treating the VOCs by using plasma discharge.
Drawings
FIG. 1 is a schematic diagram of the structure of an apparatus related to the safety control method of the present invention;
FIG. 2 is a schematic flow chart of the safety control method for monitoring and protecting VOCs treated by low-temperature plasma according to the present invention.
Detailed Description
In the process of treating VOCs by low-temperature plasma, the concentration of VOCs generated by gas released in the sewage collection, storage and treatment links fluctuates greatly and often exceeds the lower explosion limit of combustible gas, and the plasma treatment process can generate an ignition source, so that equipment combustion and explosion accidents can easily occur by using the plasma treatment process.
Based on the potential safety hazards, the invention provides a set of high-reliability and high-safety control method for VOCs in gas released in the low-temperature plasma treatment sewage collection, storage and treatment links, and when VOCs are treated by using a plasma process, the process conditions are ensured to meet the safety requirements by strictly controlling the flow, concentration, humidity, reactor outlet temperature of waste gas entering a low-temperature plasma reactor and the concentration of combustible gas in a boundary area around a treatment device.
Before introducing a safety control method for VOCs in released gas in the low-temperature plasma treatment sewage collection, storage and treatment links, a safety control device based on the method is explained in detail.
The safety control device for VOCs in the low-temperature plasma treatment sewage collection, storage and treatment link release gas comprises various sensors, an actuator and a logic controller, parameters such as flow, concentration, humidity and temperature of VOCs in a low-temperature plasma treatment module are detected in real time, the parameters are controlled to be safe level through an interlocking control system, once the parameters exceed normal set values, corresponding cut-off valves are immediately cut off, a power supply of a plasma reactor is closed, and the residual VOCs are sent into an exhaust funnel, so that the formation of dangerous factors is avoided, and the risk of fire explosion and poisoning is reduced.
The sensors of the safety control device comprise a concentration transmitter (including an environmental VOCs concentration transmitter), a humidity transmitter, a flow transmitter, a temperature transmitter and the like; the actuator of the device comprises a low-temperature plasma reactor, a regulating valve, a stop valve, an induced draft fan, a relay and the like. Except the environment VOCs concentration detector, other sensors are arranged on the waste gas treatment main pipeline, each sensor transmits a detected signal to the logic controller, and after the logic controller processes and analyzes the signal, the logic controller instructs a corresponding actuator to perform cutting and opening and closing actions through the interlocking system.
The safety control device detects the concentration of VOCs in real time through an industrial online FID detector in the process of releasing VOCs in gas in the links of collecting, storing and treating sewage in plasma treatment, when the concentration of VOCs exceeds 25% of the lower explosion limit of waste gas and the rising speed of the concentration of VOCs exceeds 100ppm/s, an air distribution valve needs to be opened, the air distribution flow is adjusted through a flow adjusting valve, the rising of the concentration of VOCs is controlled, the explosive environment is avoided, when the concentration of VOCs at the inlet of a low-temperature plasma reactor reaches 25% of the lower explosion limit, the inlet valve of the low-temperature plasma reactor is immediately cut off, a bypass valve is opened at the same time, the inlet valve for treating waste gas is cut off, the power supply of the reactor is closed, the high-concentration VOCs is discharged into an exhaust funnel, and the explosive gas in the plasma reactor is avoided.
And when an online flow detector in the safety control device detects that the flow of the waste gas is lower than a set value, the feeding cut-off valve is cut off, the power supply of the plasma reactor is cut off, and the waste gas is discharged into the exhaust funnel through a bypass. The device is provided with an on-line detection waste gas humidity transmitter, when a detection humidity signal of the plug-in type humidity transmitter exceeds a set value, the feeding cut-off valve before the reactor is cut off, the bypass valve is opened at the same time, the high-humidity waste gas is discharged into the exhaust funnel, and the power supply of the reactor is cut off at the same time.
And the temperature transmitter is arranged at the bottom of the low-temperature plasma reactor, the temperature of the reactor is monitored on line, the temperature of the reactor rises to exceed 60 ℃, the dehumidifier and the plasma reactor are closed, the feed cut-off valve before the reactor is cut off, the bypass is opened, and the mixed VOCs are discharged into the exhaust funnel.
The device analyzes and judges the trend of process fluctuation by setting a set of process parameter transmitter and formulating key control logic, and drives the cut-off valve and the regulating valve to execute the cut-off process under the condition of meeting certain process parameter deviation and process danger, thereby avoiding the occurrence of fire and explosion accidents.
The following describes in detail the specific implementation of the safety control device for VOCs in the released gas in the low-temperature plasma treatment sewage collection, storage and treatment links with the attached drawings.
As shown in figure 1, the safety control device for the VOCs in the released gas in the low-temperature plasma treatment sewage collection, storage and treatment links comprises a process parameter transmitter for detecting the process parameters of the VOCs in real time, an actuator for executing opening and closing actions and a logic controller, wherein the process parameter transmitter is connected with the actuator through a circuit, the actuator is connected with the logic controller through a circuit, the process parameter transmitter transmits the detected signals to the logic controller, and the logic controller instructs the actuator to perform the opening and closing actions after analyzing the signals.
The process parameter transmitter comprises a concentration transmitter, a humidity transmitter 6, a flow transmitter 5 and a temperature transmitter 7, wherein the concentration transmitter, the humidity transmitter 6 and the flow transmitter 5 are arranged on a main waste gas conveying pipeline connecting the sewage pool and the low-temperature plasma reactor. The temperature transmitter 7 is disposed at the bottom of the low-temperature plasma reactor. The main waste gas conveying pipeline is connected with an air distribution pipeline and is also connected with an exhaust funnel through a bypass pipeline. The concentration transmitter comprises a waste gas VOCs concentration transmitter 1 for detecting the concentration of waste gas VOCs at an inlet in a waste gas conveying main pipeline and a mixed gas VOCs concentration transmitter 2 for detecting the concentration of mixed gas VOCs after the waste gas and the air distribution are mixed.
The executor includes air distribution flow control valve 4, plasma reactor entry trip valve 10, bypass trip valve 9 and plasma reactor power relay 11, and air distribution flow control valve 4 installs on the air distribution pipeline, and plasma reactor entry trip valve 10 installs on the exhaust gas delivery trunk line, and is located the plasma reactor entrance, and bypass trip valve 9 installs on the bypass pipeline.
Concentration changer, humidity transducer, flow transmitter and temperature transmitter all are connected with logic controller, and logic controller connects air distribution flow control valve, plasma reactor entry trip valve, bypass trip valve and plasma reactor power relay respectively.
The concentration transmitter also comprises an ambient air VOCs concentration transmitter 8 for detecting the concentration of VOCs in ambient air, and the ambient air VOCs concentration transmitter 8 is connected with the logic controller. The executor still includes tail gas flow control valve 3, tail gas flow control valve 3 installs on the waste gas main conveyor pipe way, and is located the entrance.
The low-temperature plasma treatment module mainly comprises a waste gas conveying main pipeline for conveying waste gas from the sewage pool into the low-temperature plasma reactor and a low-temperature plasma reactor for treating the waste gas, wherein the waste gas conveying main pipeline is provided with two important branch pipelines which are respectively an air distribution pipeline for distributing air for the waste gas from the sewage pool and a bypass pipeline for temporarily storing the VOCs parameter abnormal waste gas in the treatment module. Except the ambient air VOCs concentration transmitter, the sensor of the safety control device is arranged on the main exhaust gas conveying pipeline to detect the concentration, humidity, flow, temperature and other parameters of VOCs, and the sensor of the control device comprises a concentration transmitter, a humidity transmitter, a flow transmitter, a temperature transmitter and the like.
The concentration transmitter adopts an FID detector or a PID monitor or a combustible gas alarm which is highly sensitive to organic matters, and the concentration detector is respectively provided with a VOCs concentration transmitter on a pipeline for waste gas to enter the plasma reactor and a pipeline for tail gas and air distribution after mixing so as to detect whether the content of VOCs with different properties exceeds the standard or not. In order to ensure that the concentration of VOCs in the environment of the low-temperature plasma processing module cannot cause damage and loss to personnel and equipment, an air concentration detector is arranged in the processing module, once the concentration of VOCs in the environment reaches the explosion lower limit, a logic controller immediately cuts off feeding, a reactor power supply is shut down, and the like, so that accidents are prevented.
The device adopts reliable vortex street flow transmitter of quality high-quality performance or orifice plate formula flow transmitter to detect VOCs's flow, flow transmitter sets up on the pipeline after mixing VOCs concentration sensor, detect VOCs's concentration, flow parameter does not exceed after the safe range, capacitanc on the main line inserts humidity transducer and will detect VOCs humidity parameter, in order to ensure that the waste gas humidity that gets into plasma reactor is up to standard, thermocouple or thermal resistance (metal) or semiconductor thermistor temperature transmitter on the main line will detect temperature parameter, in order to ensure that plasma reactor export waste gas temperature is up to standard.
Signals acquired by all sensors are transmitted to a logic controller for signal analysis, the logic controller adopts a fault triggering type, the logic controller compares and analyzes the collected signals of concentration, humidity, flow or temperature and the like with corresponding parameter set values arranged in the controller, once the parameters exceeding or falling below the set values are found, information is immediately transmitted to a corresponding actuator for actions such as cutting off and the like according to the type of the collected signals, and the formation of dangerous factors is avoided.
The executor of the safety control device comprises a low-temperature plasma reactor, a regulating valve, a stop valve, an induced draft fan, a relay and the like. Because the VOCs contain corrosive substances, the regulating valve and the cut-off valve both adopt pneumatic butterfly valves with stable performance, corrosion resistance and crack resistance. Wherein VOCs admits air the main line and sets up tail gas flow control valve, sets up air distribution flow control valve on the air distribution pipeline, and two governing valves adjust the waste gas flow according to the VOCs concentration that comes from the effluent water sump, make mixed VOCs concentration be in safe range, avoid combustible gas concentration to reach the explosion lower limit. When the parameters of the VOCs are abnormal, the logic controller firstly drives a cut-off valve in front of the low-temperature plasma reactor to cut off feeding, then opens a bypass cut-off valve, and discharges the VOCs with abnormal content into an exhaust funnel, thereby avoiding accidents such as fire and explosion of the device.
The invention relates to a safe control method for VOCs in released gas in the processes of collecting, storing and treating sewage in low-temperature plasma treatment, which comprises the following steps: the technical parameters of VOCs in the waste gas conveying main pipeline are detected in real time by adopting a technical parameter transmitter, the waste gas conveying main pipeline is connected between a sewage pool and a low-temperature plasma reactor, the detected signals are transmitted to a logic controller by the technical parameter transmitter, and after the logic controller analyzes the signals, an actuator is indicated to perform opening and closing actions and comprises a plasma reactor inlet stop valve and a plasma reactor power supply relay.
The method comprises the following steps:
the first step is as follows: sequentially detecting the concentration of VOCs in tail gas from a sewage tank, the concentration of VOCs after mixing with air, the flow rate of mixed VOCs after air distribution, the humidity of the mixed VOCs before entering a low-temperature plasma reactor and the temperature of the mixed VOCs in the low-temperature plasma reactor by a process parameter transmitter;
the second step is that: if the parameter exceeds or is lower than the set value in the first step of detection process, the logic controller immediately sends a signal to the actuator to execute corresponding action.
In the first step: the detection flow of the process parameters is a cyclic process, and if the signals detected by the process parameter transmitter are not abnormal, the detection is repeated cyclically.
More specifically, the method comprises the following steps:
(1) detecting the concentration of the tail gas VOCs in the main waste gas conveying pipeline by using a tail gas VOCs concentration transmitter, if the concentration of the VOCs in the tail gas exceeds a set range in a logic controller, sending a signal to the logic controller to instruct to cut off a plasma reactor inlet cut-off valve and a plasma reactor power supply relay, and opening a bypass cut-off valve to discharge the high-concentration VOCs tail gas into an exhaust funnel through a bypass pipeline;
(2) if the concentration of VOCs in the tail gas is within the set range of the logic controller, detecting the concentration of VOCs in the mixed gas after air distribution through a mixed gas VOCs concentration transmitter, and adjusting an air distribution flow regulating valve through the logic controller to regulate the concentration of VOCs in the mixed gas to the set range when the concentration of VOCs in the mixed gas exceeds the set range of the logic controller;
(3) detecting the concentration of VOCs in the environment by adopting a surrounding air VOCs concentration transmitter, if the concentration of VOCs in the environment exceeds a set range, controlling and cutting off a plasma reactor inlet cut-off valve and a plasma reactor power supply relay by a logic controller, opening a bypass cut-off valve, and introducing mixed gas in a waste gas conveying main pipeline into an exhaust funnel;
(4) detecting the flow of the mixed gas by adopting a flow transmitter, if the flow exceeds a set range, sending a signal to indicate and cut off a plasma reactor inlet cut-off valve and a plasma reactor power supply relay by a logic controller, opening a bypass cut-off valve, and introducing the mixed gas in a waste gas conveying main pipeline into an exhaust funnel; if the humidity does not exceed the set range, the next step of humidity detection is carried out;
(5) detecting the humidity of the mixed gas by adopting a humidity transmitter, if the humidity exceeds a set range, sending a signal to indicate and cut off a plasma reactor inlet cut-off valve and a plasma reactor power supply relay by a logic controller, opening a bypass cut-off valve, and guiding the mixed gas in a waste gas conveying main pipeline into an exhaust funnel; if the temperature does not exceed the set range, entering the next temperature detection;
(6) detecting the temperature of the low-temperature plasma reactor in the process of treating the mixed VOCs by using a temperature transmitter, if the temperature exceeds a set range, sending a signal to indicate to cut off a plasma reactor inlet cut-off valve and a plasma reactor power supply relay by a logic controller, opening a bypass cut-off valve, and introducing the mixed gas in a waste gas conveying main pipeline into an exhaust funnel; if the set range is not exceeded, the reactor is normally operated.
The following description is made with reference to the accompanying drawings.
As shown in fig. 2, the detection process of the security control method of the present invention for VOCs mainly includes:
the first step is as follows: detecting the concentration of VOCs in tail gas from a sewage tank;
the second step is that: detecting the concentration of VOCs after mixing with air;
the third step: detecting the flow of the mixed VOCs after air distribution;
the fourth step: detecting the humidity of the mixed VOCs before entering the low-temperature plasma reactor;
the fifth step: and detecting the temperature of the mixed VOCs in the low-temperature plasma reactor.
When any parameter in any step of the detection process exceeds or is lower than a set value, the logic controller immediately sends a signal to the actuator to execute corresponding action. The detection process is a cyclic process, and if the signal detected by the sensor in the control device is not abnormal, the control device executes the next control logic.
The invention relates to a safe control method for VOCs in released gas in the processes of collecting, storing and treating sewage by low-temperature plasma treatment, which has the specific implementation mode that:
the method comprises the following steps of (1) installing a tail gas VOCs concentration transmitter 1 on an air inlet pipeline for treating VOCs-containing tail gas by using low-temperature plasma, and analyzing the content of VOCs total hydrocarbons in the waste gas; the concentration signal is sent to a logic controller in the device and compared with a set value, when the concentration signal is greater than the set value and the concentration rising speed is greater than the set value, the logic controller drives an air distribution flow regulating valve 4 on an air distribution pipeline to be opened to distribute air to tail gas entering the processing device, and simultaneously regulates an exhaust flow regulating valve 3 to reduce the concentration of VOCs and prevent the concentration of combustible gas from reaching the lower explosion limit.
The air distribution flow regulating valve 4 is opened and closed according to the signal of the mixed gas concentration transmitter, and meanwhile, when the VOCs of the environmental concentration detected by the ambient air VOCs concentration detector 8 reaches the set value of the explosion lower limit, air distribution is stopped, and the air distribution flow regulating valve 4 is cut off.
The mixed gas after the air distribution detects the concentration of VOCs through the mixed gas VOCs concentration transmitter 2 of the main pipeline, when the concentration is larger than the upper limit of a dangerous set value, the inlet cut-off valve 10 and the upstream buffer tank cut-off valve of the plasma reactor are cut off, the bypass cut-off valve 9 is opened, and the high-concentration VOCs waste gas is directly discharged into the exhaust funnel through a bypass.
The mixed gas flow transmitter 5 on the main pipeline is used for analyzing the flow of the mixed gas VOCs, the flow signal is sent to the controller to be compared with a set value, when the flow signal is smaller than the set value, the controller sends a signal to indicate the feeding valve to cut off feeding, the bypass cut-off valve 9 which is discharged into the exhaust funnel is opened, and the mixed gas VOCs with low flow is directly discharged into the exhaust funnel through a bypass.
Humidity transmitter 6 on the main line gathers signal transmission in real time and sends to logic controller, and logic controller receives humidity signal after, is greater than the setting value to the gas mixture humidity, and logic controller drive output electrical relay R001 closes plasma reactor's power, cuts off plasma reactor entry trip valve 10 simultaneously to open bypass trip valve 9, the exhaust stack is directly discharged into through the bypass to the VOCs waste gas of high humidity.
The temperature transmitter 7 at the lower part of the plasma reactor collects signals and transmits the signals to the logic controller, and after the logic controller receives the temperature signals, the logic controller drives the output reactor power supply relay R001 to close the power supply of the plasma reactor and cut off the inlet cut-off valve and the bypass cut-off valve 9 to guide the mixed VOCs into the bypass exhaust funnel when the reaction temperature exceeds a set value.
The specific application example of the safety control method for monitoring and protecting VOCs treated by low-temperature plasma is as follows:
waste gas from the effluent water sump gets into low temperature plasma reactor through waste gas main pipe conveyor, tail gas that contains VOCs carries out tail gas VOCs concentration analysis through the tail gas VOCs concentration transmitter on the main pipe at first, if the concentration of VOCs is higher than 25% of the explosion lower limit that sets up in the logic controller in the tail gas, control system sends signal indication immediately and cuts off the feeding inlet valve of upper reaches buffer tank, turn-off air distribution system and draught fan simultaneously, cut off plasma reactor's inlet valve and power, and open the bypass trip valve, make the VOCs tail gas of high concentration discharge the aiutage through the bypass, avoid the VOCs gathering of too high concentration in the reactor, increase the danger of blasting.
If the concentration number that VOCs concentration transmitter gathered in the tail gas is less than 25% of the lower limit of explosion, tail gas VOCs will form mixed VOCs with the air mixture that comes from the air distribution pipeline, mixed gas VOCs concentration sends into logic controller through the mixed gas concentration transmitter collection signal on the pipeline and analyzes, when mixed VOCs concentration is greater than 25% of the lower limit of explosion to mixed gas concentration rising speed through control logic inspection is greater than 100ppm/s, if VOCs concentration is not in the lower limit of explosion in the environment that ambient air VOCs concentration detector detected this moment, can adjust the air distribution flow control valve, the concentration of the mixed gas in with the pipeline is adjusted lowly. If the concentration of VOCs in the environment is higher than the lower explosion limit, the control system immediately cuts off the feeding valve, closes the power supply of the plasma reactor, opens a bypass to guide the mixed gas in the pipeline into the exhaust funnel, and in addition, when the detected value of the rising concentration of the mixed VOCs is less than 100ppm/s, the control system executes the same action.
The flow of the mixed gas VOCs subjected to air distribution or the VOCs waste gas with the concentration less than 25% of the lower explosion limit is detected by a mixed gas flow transmitter, when the flow of the mixed gas is greater than a set value, the mixed gas is transmitted to a humidity transmitter through a pipeline, and when the flow of the mixed gas is less than the set value, the mixed gas is required to be stopped for avoiding error caused by measurement error caused by flow fluctuation, the mixed VOCs need to be stopped and delayed for 10s before flow detection is carried out, at the moment, the detected flow of the mixed gas is still less than the set value, a system instructs a related actuator to carry out related operations of cutting off, opening a bypass and the like according to judgment, and otherwise, the next step of humidity detection is carried out.
The mixed gas entering the humidity detection can enter the plasma reactor for waste gas treatment when the humidity is lower than a set value, and the unqualified mixed VOCs higher than the set value are judged by system logic, then the power supply of the reactor is turned off, the inlet valve of the reactor is cut off, a bypass is opened to discharge the high-humidity VOCs into the exhaust funnel, and the induced draft fan is closed.
The temperature of VOCs can be monitored in real time in the process of treating the mixed VOCs by the low-temperature plasma reactor, the temperature is less than 60 ℃ which is safe operation temperature, and the system is normally operated; when the temperature is higher than 60 ℃, the logic controller sends a signal to indicate that the power supply and the feed valve of the reactor are closed, the bypass is opened, and the induced draft fan is closed, so that the fire and explosion accidents caused by overhigh temperature of the reactor are prevented.
The safety control method for VOCs in released gas in the low-temperature plasma treatment sewage collection, storage and treatment links can also be applied to treatment of process waste gas or inorganically discharged waste gas and the like.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, and all equivalent substitutions, substitutions or simple changes made on the basis of the above-mentioned technical solutions should fall within the scope of the present invention.
Claims (5)
1. A safe control method for VOCs in released gas in low-temperature plasma treatment sewage collection, storage and treatment links is characterized by comprising the following steps: the method comprises the following steps that a process parameter transmitter is adopted to detect process parameters of VOCs in a main waste gas conveying pipeline in real time, the main waste gas conveying pipeline is connected between a sewage pool and a low-temperature plasma reactor and between the low-temperature plasma reactor and an exhaust funnel, the process parameter transmitter transmits detected signals to a logic controller, and after the logic controller analyzes the signals, an actuator is indicated to perform opening and closing actions, wherein the actuator comprises a plasma reactor inlet cut-off valve and a plasma reactor power supply relay;
the exhaust gas conveying main pipeline is connected with an air distribution pipeline, the exhaust gas conveying main pipeline is also connected with an exhaust funnel through a bypass pipeline, the actuator further comprises an air distribution flow regulating valve and a bypass cut-off valve, the air distribution flow regulating valve is installed on the air distribution pipeline, and the bypass cut-off valve is installed on the bypass pipeline;
the process parameter transmitter comprises a concentration transmitter, a humidity transmitter, a flow transmitter and a temperature transmitter, wherein the concentration transmitter, the humidity transmitter and the flow transmitter are arranged on the main waste gas conveying pipeline, and the temperature transmitter is arranged at the bottom of the low-temperature plasma reactor;
the concentration transmitter comprises a waste gas VOCs concentration transmitter and a mixed gas VOCs concentration transmitter, the waste gas VOCs concentration transmitter is used for detecting the concentration of waste gas VOCs at an inlet in a main waste gas conveying pipeline, and the mixed gas VOCs concentration transmitter is used for detecting the concentration of mixed gas VOCs after the waste gas and air are mixed;
the concentration transmitter also comprises a VOCs concentration transmitter of ambient air, which is used for detecting the concentration of VOCs in the ambient air;
the safety control method specifically comprises the following steps:
(1) detecting the concentration of the tail gas VOCs in the main waste gas conveying pipeline by using a tail gas VOCs concentration transmitter, if the concentration of the VOCs in the tail gas exceeds 25% of a set explosion lower limit in a logic controller, sending a signal to the logic controller to instruct to cut off a plasma reactor inlet cut-off valve and a plasma reactor power supply relay, and opening a bypass cut-off valve to discharge the high-concentration VOCs tail gas into an exhaust funnel through a bypass pipeline;
(2) if the concentration of VOCs in the tail gas is lower than 25% of the set explosion lower limit of the logic controller, detecting the concentration of VOCs of the mixed gas after air distribution through a mixed gas VOCs concentration transmitter, and when the concentration of VOCs of the mixed gas exceeds 25% of the set explosion lower limit of the logic controller and the rising speed of the concentration of VOCs of the mixed gas exceeds 100ppm/s, adjusting an air distribution flow regulating valve through the logic controller so as to regulate the concentration of VOCs of the mixed gas to a set range;
(3) detecting the concentration of VOCs in the environment by adopting a surrounding air VOCs concentration transmitter, if the concentration of VOCs in the environment exceeds a set range, controlling and cutting off a plasma reactor inlet cut-off valve and a plasma reactor power supply relay by a logic controller, opening a bypass cut-off valve, and introducing mixed gas in a waste gas conveying main pipeline into an exhaust funnel;
(4) detecting the flow of the mixed gas by adopting a flow transmitter, if the flow exceeds a set range, sending a signal to indicate and cut off a plasma reactor inlet cut-off valve and a plasma reactor power supply relay by a logic controller, opening a bypass cut-off valve, and introducing the mixed gas in a waste gas conveying main pipeline into an exhaust funnel; if the humidity does not exceed the set range, the next step of humidity detection is carried out;
(5) detecting the humidity of the mixed gas by adopting a humidity transmitter, if the humidity exceeds a set range, sending a signal to indicate and cut off a plasma reactor inlet cut-off valve and a plasma reactor power supply relay by a logic controller, opening a bypass cut-off valve, and guiding the mixed gas in a waste gas conveying main pipeline into an exhaust funnel; if the temperature does not exceed the set range, entering the next temperature detection;
(6) detecting the temperature of the low-temperature plasma reactor in the process of treating the mixed VOCs by using a temperature transmitter, if the temperature exceeds a set range, sending a signal to indicate to cut off a plasma reactor inlet cut-off valve and a plasma reactor power supply relay by a logic controller, opening a bypass cut-off valve, and introducing the mixed gas in a waste gas conveying main pipeline into an exhaust funnel; if the set range is not exceeded, the reactor is normally operated.
2. The safety control method for VOCs in released gas in low-temperature plasma treatment sewage collection, storage and treatment links according to claim 1, characterized in that: the executor also comprises an exhaust flow regulating valve which is arranged on the main exhaust gas conveying pipeline.
3. The safety control method for VOCs in released gas in low-temperature plasma treatment sewage collection, storage and treatment links according to claim 1, characterized in that: the concentration transmitter adopts a flame ionization detector, a photoionization detector or a combustible gas alarm, the flow transmitter adopts a vortex flow transmitter or a perforated plate type flow transmitter, the humidity transmitter adopts a capacitance type inserted humidity sensor, and the concentration transmitter, the flow transmitter and the humidity transmitter are sequentially arranged on the main waste gas conveying pipeline along the gas flow direction.
4. The safety control method for VOCs in gas released in sewage collection, storage and treatment links in low-temperature plasma treatment according to claim 1, characterized by comprising the following steps:
the first step is as follows: sequentially detecting the concentration of VOCs in the released gas from the sewage collection, storage and treatment links, the concentration of VOCs after mixing with air, the flow of mixed VOCs after air distribution, the humidity of the mixed VOCs before entering the low-temperature plasma reactor and the temperature of the mixed VOCs in the low-temperature plasma reactor by a process parameter transmitter;
the second step is that: if the parameter exceeds or is lower than the set value in the first step of detection process, the logic controller immediately sends a signal to the actuator to execute corresponding action.
5. The method according to claim 4, wherein the first step comprises: the detection flow of the process parameters is a cyclic process, and if the signals detected by the process parameter transmitter are not abnormal, the detection is repeated cyclically.
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| CN111744341B (en) * | 2020-07-09 | 2022-06-17 | 四川轻化工大学 | Explosion-proof monitoring control method and system for low-temperature plasma organic waste gas treatment |
| CN115121097A (en) * | 2022-08-29 | 2022-09-30 | 江苏美克美斯自动化科技有限责任公司 | Low-temperature plasma waste gas treatment and purification control method and control system |
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