CN106918637B - On-line total hydrocarbon concentration monitoring device and method for gas treatment device - Google Patents
On-line total hydrocarbon concentration monitoring device and method for gas treatment device Download PDFInfo
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- CN106918637B CN106918637B CN201710245059.0A CN201710245059A CN106918637B CN 106918637 B CN106918637 B CN 106918637B CN 201710245059 A CN201710245059 A CN 201710245059A CN 106918637 B CN106918637 B CN 106918637B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/626—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using heat to ionise a gas
Abstract
The invention relates to an on-line total hydrocarbon concentration monitoring device and method of a gas treatment device, and mainly solves the problem that the safety and environmental protection requirements of multipoint and multi-condition monitoring and continuous monitoring in the prior art are coordinated with the cost of multiple detectors. The invention adopts an on-line total hydrocarbon concentration monitoring device and method of a gas processing device, 2 detectors are adopted, the 1 st detector keeps monitoring the total hydrocarbon concentration in the gas at the inlet of the gas processing device, and the concentration change of the total hydrocarbon in the gas is monitored; the 2 nd detector is used for monitoring the total hydrocarbon concentration in the exhaust gas of the gas treatment device, and the intermediate treatment sections such as dilution of the gas treatment device are timely switched to carry out verification monitoring, so that the technical scheme better solves the problem and can be used for on-line total hydrocarbon concentration monitoring of the gas treatment device.
Description
Technical Field
The invention relates to an on-line total hydrocarbon concentration monitoring device and method for a gas treatment device.
Background
A gas processing apparatus that is arranged in environmental protection of waste gas of petrochemical industry etc. to handle, the total hydrocarbon concentration of its waste gas that can handle usually has an optimum scope (for example 1000 ~ 10000 mg/m)3) When the total hydrocarbon concentration in the inlet exhaust gas exceeds a set value, there are problems such as a decrease in treatment efficiency, and even safety risks such as overheating and explosion, and therefore, it is generally necessary to grasp the total hydrocarbon concentration in the inlet exhaust gas to adopt dilution or the like for the treatment deviceThe method reduces the total hydrocarbon concentration in the inlet waste gas to provide data support, meanwhile, in order to ensure that measures such as dilution and the like really meet design requirements, the total hydrocarbon concentration in the diluted waste gas also needs to be monitored so as to effectively protect a treatment device, and in order to verify the treatment effect, the total hydrocarbon concentration in a gas outlet needs to be monitored so as to ensure that the environment-friendly allowable emission requirement is met. That is, generally, such petrochemical waste gas treatment devices require continuous monitoring of at least 3 points or states of the inlet, the diluted intermediate process and the outlet. However, the currently common device or system for monitoring the concentration of total hydrocarbons in on-line gas mostly monitors the concentration of total hydrocarbons in waste gas discharged by a fixed pollution source, and due to different application occasions, the device or system generally has the characteristics of few monitoring point locations (one instrument only corresponds to one fixed pollution source discharge port) and the like, and cannot meet the requirements that a gas processing device has many monitoring point locations for monitoring the concentration of total hydrocarbons in gas (generally including the monitoring requirements of the concentration of total hydrocarbons in gas at an inlet, an outlet and an intermediate stage), and the like. The invention discloses an instrument for measuring total hydrocarbons of methane and non-methane based on a high-temperature converter in an atmospheric hydrocarbon on-line analyzer, namely Zyanqing and Mayue, and the like, in Chinese invention patent CN102621272A, which is only 1 on-line monitor, does not consider the problem of multi-point monitoring, and cannot ensure the requirements of process control and the like of a gas treatment device. The local technical specification ' installation and networking technical requirements of a fixed pollution source non-methane total hydrocarbon on-line monitoring system in Shanghai city ' formulated by the environmental protection agency of Shanghai city ' mainly makes a regulation on monitoring of non-methane total hydrocarbons in waste gas discharged by a fixed pollution source based on a single point, and does not relate to continuous monitoring requirements of multiple points and multiple conditions in a waste gas treatment device. Moreover, the above-mentioned methods are all set by a single detector, and when the detector needs to be maintained, zeroed, calibrated, and the like, the whole processing device must be stopped to ensure the safety of the processing device, which brings great environmental protection pressure. If 1 online monitoring instrument is deployed at each monitoring point, higher equipment cost is brought, and meanwhile, the consumption of operation and maintenance costs of electric power, hydrogen, clean air and the like required by the simultaneous operation of 3 monitoring instruments is also large. That is, there is a single point monitoring in all the existing reports and technical schemesThe problem that the requirement is not met or the equipment and operation cost of the detector is high at each point.
Disclosure of Invention
The invention aims to solve the technical problem of coordinating the cost and the demand of multipoint and multi-condition monitoring and continuous monitoring of a gas treatment device in the prior art, and provides a novel on-line total hydrocarbon concentration monitoring device and a method of the gas treatment device. The method has the advantages of meeting the safety and environmental protection requirements of multipoint and multi-condition monitoring and continuous monitoring and having lower cost.
In order to solve the problems, the technical scheme adopted by the invention is as follows: an on-line total hydrocarbon concentration monitoring device and method for a gas processing device, wherein the device comprises a detector and a dilution system; a programmable control system is used as a hardware support, 2 detectors are adopted, the 1 st detector keeps monitoring the concentration of total hydrocarbon in gas at an inlet of a gas processing device, and the concentration change of the total hydrocarbon in the gas is monitored; monitoring total hydrocarbon concentration in gas processing apparatus's the exhaust gas with 2 nd platform detector, grasp the monitoring environmental protection emission condition up to standard, when monitoring gas processing apparatus entry gas concentration and surpassing the early warning value, gas processing apparatus starts dilution system and dilutes entry gas, control system judges that safety priority promotes, switch 2 nd platform detector to the total hydrocarbon concentration in the gas processing apparatus entry gas after the monitoring is diluted, monitoring dilution effect, confirm that total hydrocarbon concentration satisfies the safety requirement in the gas that gets into processing apparatus, provide data support for system control. When the total hydrocarbon concentration in the inlet gas drops below the pre-alarm value, the 2 nd detector switches back to monitoring the total hydrocarbon concentration in the vent.
Among the above-mentioned technical scheme, preferably, 1 detector monitors total hydrocarbon concentration in the row of mouthful gas under normal operating mode, grasps the environmental protection emission standard condition of device, and when total hydrocarbon concentration risees and needs processing apparatus to dilute the processing apparatus when appearing in the gas, the safety importance upgrades, switches this detector to the verification that dilutes the back workshop section and carry out the dilution effect and detect.
In the above technical solution, preferably, 2 detectors can ensure that the on-line monitoring of the total hydrocarbon concentration in the exhaust gas entering the processing unit of the gas processing device is maintained continuously through system judgment and switching control when 1 detector is in maintenance, zero-setting or calibration state.
In the above-described embodiment, the 2 detectors selected are preferably detectors responsive to the total hydrocarbon concentration in the gas, and the hydrogen flame ionization detector is selected.
In the above technical solution, preferably, the control program of the monitoring system performs auto-zero and calibration setting of the detector at a stage where the operating conditions are relatively stable, and selects the auto-zero and calibration setting to be performed at night when the process variation operation is not performed.
The invention relates to an on-line total hydrocarbon concentration monitoring system in a gas treatment device, which overcomes the defects that the monitoring of the existing method can not cover and monitor the total hydrocarbon concentration in the gas of the process inlet, the intermediate process and the whole process of the outlet of the gas treatment device, and the like.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention.
The present invention will be further illustrated by the following examples, but is not limited to these examples.
Detailed Description
[ example 1 ]
An online total hydrocarbon concentration monitoring device and method of a gas processing device are disclosed, as shown in figure 1, an online total hydrocarbon concentration monitoring system can extract gas samples from 3 monitoring points (hereinafter referred to as 1# monitoring point, 2# monitoring point and 3# monitoring point) of a waste gas inlet, a dilution processing intermediate process and a tail gas outlet to rapidly sample the gas samples to 2 FID detectors to detect the concentration of the total hydrocarbons in the gas.
The online total hydrocarbon concentration monitoring system is connected with an external PLC in modes of RS485, analog quantity, switching value IO signals and the like. And transmitting the information of the total hydrocarbon concentration, the valve state, the working state of the detector and the like to an external PLC (programmable logic controller) in real time, and remotely controlling the running state of the on-line total hydrocarbon concentration monitoring system through the external PLC.
In a normal state, 2 hydrogen flame ionization detectors (hereinafter referred to as 1# FID and 2# FID) respectively monitor the exhaust gas concentration of the 1# monitoring point and the 3# monitoring point, wherein the former is used for monitoring whether the total hydrocarbon concentration in the inlet exhaust gas is within a safe range, and the latter is used for monitoring whether the total hydrocarbon concentration in the treated exhaust gas reaches the emission standard.
When the No. 1 FID monitoring result exceeds a set value, the PLC provides a signal for the gas processing device, and the signal is used for controlling means such as starting air dilution and the like to reduce the concentration of total hydrocarbons in the waste gas entering the gas unit; meanwhile, the PLC control valve is switched, so that the 2# FID is changed into monitoring the gas concentration after dilution treatment, namely the gas concentration of the 2# monitoring point, the effectiveness of the dilution means is verified, and the safety of a subsequent treatment unit is ensured. When the total hydrocarbon concentration in the gas of the No. 2 monitoring point is monitored to be still beyond the set value, timely information can be provided for the control system to take safety measures such as direct emptying or shutdown. When the 1# FID monitoring result is lower than the set value, the control system switches the valve to enable the 2# FID to return to the state of monitoring the 3# monitoring point, and the emission condition is continuously monitored.
When the 1# FID is in maintenance, zero setting or calibration and other conditions, the sampling flow path is switched under the control of an external PLC, so that the sampling channel of the 2# FID is switched to a 2# monitoring point, and the 2# FID is changed to monitor the total hydrocarbon concentration in the gas of the 2# monitoring point, so that the system can master the total hydrocarbon concentration in the gas entering a subsequent processing unit, and data support is provided for ensuring the safe operation of the processing unit. When the total hydrocarbon concentration in the gas of the No. 2 monitoring point is monitored to exceed a set value, timely information can be provided for a control system to take safety measures such as direct emptying or shutdown.
When the 2# FID is in maintenance, zeroing or calibration, etc., the total hydrocarbon concentration in the gas at the 1# monitoring point monitored by the 1# FID allows the system to keep track of the total hydrocarbon concentration in the gas entering the subsequent processing unit, thereby providing data support for ensuring safe operation of the processing unit. When the total hydrocarbon concentration in the gas of the 1# monitoring point is monitored to exceed a set value, timely information can be provided for a control system to take safety measures such as direct emptying or shutdown.
Obviously, the method of the invention better solves the problem of coordination between the safety and environmental protection requirements of multipoint and multi-condition monitoring and continuous monitoring of the gas processing device and the cost of multiple detectors, obviously reduces the cost of equipment and operation and maintenance due to the reduction of 1 hydrogen flame ionization detector, and can be applied to the gas processing device with the requirements of monitoring the total hydrocarbon concentration in an inlet, an intermediate process and an outlet.
Claims (1)
1. A method of on-line total hydrocarbon concentration monitoring of a gas processing plant, the monitoring plant used in the method comprising a detector, a dilution system; a programmable control system is used as a hardware support, 2 detectors are adopted, the 1 st detector keeps monitoring the concentration of total hydrocarbon in gas at an inlet of a gas processing device, and the concentration change of the total hydrocarbon in the gas is monitored; monitoring the concentration of total hydrocarbons in the exhaust gas of the gas treatment device by using a 2 nd detector, grasping the environment-friendly emission standard, when the concentration of the inlet gas of the gas treatment device is monitored to be higher than an early warning value, starting a dilution system by the gas treatment device to dilute the inlet gas, judging the safety priority by a control system to be improved, switching the 2 nd detector to the monitoring of the concentration of the total hydrocarbons in the diluted inlet gas of the gas treatment device, monitoring the dilution effect, confirming that the concentration of the total hydrocarbons in the gas entering the treatment device meets the safety requirement, and providing data support for system control; when the total hydrocarbon concentration in the inlet gas drops below the pre-alarm value, the 2 nd detector switches back to monitoring the total hydrocarbon concentration in the vent; 1, monitoring the concentration of total hydrocarbons in gas at an exhaust port by using a detector under normal working conditions, mastering the environment-friendly emission standard-reaching condition of a device, upgrading the safety importance when the concentration of the total hydrocarbons in the gas rises and needs to be diluted by using a treatment device, and switching the detector to a post-dilution working section for verifying and detecting the dilution effect; 2 detectors can ensure that when 1 detector is in maintenance, zero setting or calibration state, the on-line monitoring of the total hydrocarbon concentration in the waste gas entering the processing unit of the gas processing device is kept continuously through system judgment and switching control; the 2 detectors selected were detectors responsive to the total hydrocarbon concentration in the gas, the hydrogen flame ionization detector being selected; the control program of the monitoring system sets the auto-zero and calibration of the detector at a stage where the conditions are relatively stable, and selects to be performed at night when the process variation operation is not normally performed.
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