CN113025359A - Coking chemical product waste gas treatment process monitoring system - Google Patents
Coking chemical product waste gas treatment process monitoring system Download PDFInfo
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- CN113025359A CN113025359A CN202110280102.3A CN202110280102A CN113025359A CN 113025359 A CN113025359 A CN 113025359A CN 202110280102 A CN202110280102 A CN 202110280102A CN 113025359 A CN113025359 A CN 113025359A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
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Abstract
The invention relates to the technical field of coking chemical product waste gas treatment equipment, in particular to a coking chemical product waste gas treatment process monitoring system. A cut-off valve, an emergency relief valve, a flowmeter and a VOCs online detection device are arranged on a conveying pipeline connecting the dryer and the coke oven; a storage tank is arranged between the dryer and the emergency relief valve, an opening is formed in the upper end of the storage tank, a cover is arranged on the opening, or an air distribution port is formed in the top of the storage tank; the VOCs concentration is used for detecting various gas concentrations in a conveying pipeline before entering the coke oven by the online detection device, when the detected various gas concentrations exceed an upper limit value, the controller controls the emergency bleeding valve to be in an open state, the control stop valve is in a closed state, an opening or an air distribution port at the upper end of the storage tank is opened at the same time, the concentration of waste gas in the storage tank and the content of various waste gases are adjusted, the concentration and the content of various gases entering the coke oven are further controlled, nitrogen oxides generated by gas combustion in the coke oven are reduced, and secondary pollution of air is reduced.
Description
Technical Field
The invention relates to the technical field of coking chemical product waste gas treatment equipment, in particular to a coking chemical product waste gas treatment process monitoring system.
Background
The working flow of the coking chemical waste gas treatment process is as follows: the waste gas collecting device collects the produced VOCs in the corresponding area, the collected produced VOCs are collected into the collecting main pipeline through the branch pipelines, and the produced VOCs in the collecting main pipeline are introduced into the turbine absorption machine through the fan. Under the action of the turbine absorber, ammonia gas and desulfurization waste gas contained in the produced VOCs enter equipment for centrifugal scrubbing purification, ammonia gas dissolved in water and the like are absorbed, and ammonia-containing wastewater enters a sewage treatment station and/or a sewage recycling system for recycling through a water outlet at the lower end of the turbine absorber. The waste gas after centrifugal absorption is introduced into a drier through an exhaust port at the upper end of a turbine absorber, and the waste gas is dried by the drier and then enters a coke oven for combustion through pipeline pressure regulation and air distribution, so that zero emission treatment of VOCs in chemical production is realized. And the gas from the gas outlet of the coke oven enters a desulfurization and denitration device for subsequent treatment.
In the above process, firstly, the safety and reliability of the whole process flow are ensured, however, in all links from the point source of the discharge of the VOCs, collection and transportation to the coke oven, the prior art does not establish a set of safety prevention, chain protection and emergency design scheme for the system. The whole process flow has many potential safety hazards, especially the concentration of waste gas entering the coke oven from the dryer and the content of various gases can not be controlled, and further the low-nitrogen combustion waste gas circulating system of the coke oven is influenced, so that the nitrogen oxides generated by the combustion of the gases in the coke oven are more, and the nitrogen oxides are discharged into the atmosphere to cause secondary pollution of air.
Therefore, in view of the current situation, it is urgently needed to design and produce a coking chemical product waste gas treatment process monitoring system so as to solve the problem that in the prior art, because the concentration of waste gas entering a coke oven from a dryer and the content of various gases cannot be controlled, a low-nitrogen combustion waste gas circulation system of the coke oven is further influenced, so that the amount of nitrogen oxides generated by the combustion of the gases in the coke oven is large, and the nitrogen oxides are discharged into the atmosphere to cause secondary pollution of the air.
Disclosure of Invention
The invention aims to provide a coking chemical product waste gas treatment process monitoring system, which can control the concentration of waste gas entering a coke oven from a dryer and the content of various gases, reduce nitrogen oxides generated by gas combustion in the coke oven and reduce secondary pollution of air.
The purpose of the invention is realized by the following technical scheme.
A coking chemical waste gas treatment process monitoring system is characterized in that a sealed waste gas collecting device is respectively arranged at a waste gas discharge port of a biochemical pool and a salt extraction area, and the sealed waste gas collecting device, a fan, a turbine absorber, a dryer and a coke oven are communicated in sequence through conveying pipes;
a cut-off valve, an emergency bleeding valve, a flowmeter and a VOCs online detection device are arranged on a conveying pipeline connecting the drying machine and the coke oven, the cut-off valve is positioned at one end close to the coke oven, the emergency bleeding valve is positioned at one end close to the drying machine, the flowmeter and VOCs online detection device is positioned between the cut-off valve and the emergency bleeding valve, and the cut-off valve, the emergency bleeding valve, the flowmeter and the VOCs online detection device are all connected with a controller;
the flow meter is used for detecting the flow of VOCs in a conveying pipeline before entering the coke oven;
the VOCs online detection device is used for detecting the ammonia concentration, the hydrogen sulfide concentration, the benzene concentration and the oxygen concentration in a conveying pipeline before entering the coke oven, controlling the ammonia concentration in the conveying pipeline before entering the coke oven not to exceed an upper limit value A, the hydrogen sulfide concentration not to exceed an upper limit value B and the benzene concentration not to exceed an upper limit value C, and when the ammonia concentration, the hydrogen sulfide concentration and the benzene concentration exceed the upper limit value C, the controller controls the emergency bleeding valve to be in an open state and controls the cut-off valve to be in a closed state;
a storage tank is arranged between the dryer and the emergency bleeding valve, an opening is formed in the upper end of the storage tank, an openable cover is arranged on the opening, or an air distribution opening is formed in the top of the storage tank.
Preferably, the tail ends of the biochemical pool and the salt extracting area are respectively provided with a pressure transmitter and an automatic pressure control device, and the pressure transmitter and the automatic pressure control device are both connected with the controller.
Preferably, nitrogen seals are provided in the crude benzene tank, the lean oil tank and the rich oil tank in the desulfurization ammonium sulfate section.
Preferably, the crude benzene tank, the lean oil tank and the rich oil tank which are provided with the nitrogen sealing devices are all provided with remote pressure monitoring devices, and all the remote pressure monitoring devices are connected with the controller.
Preferably, a set of mist traps is arranged in each sealed exhaust gas collecting device.
Preferably, a flame arrester is arranged at the outlet of the fan.
Preferably, the outlet of the fan is also provided with a combustible gas alarm, and the conveying pipe connected with the outlet of the fan is provided with an emergency three-way valve.
Preferably, the combustible gas alarm comprises an alarm controller and a detector, and the detector and the emergency three-way valve are respectively connected with the alarm controller through cables.
Preferably, the value of the upper limit value A is 350mg/m3The upper limit value B is 300mg/m3The upper limit value C is 500 ppm.
The invention has the beneficial effects that:
according to the coking chemical production waste gas treatment process monitoring system provided by the scheme, a stop valve, an emergency bleeding valve, a flowmeter and a VOCs online detection device are arranged on a conveying pipeline connecting a drying machine and a coke oven, the stop valve is positioned at one end close to the coke oven, the emergency bleeding valve is positioned at one end close to the drying machine, the flowmeter and VOCs online detection device is positioned between the stop valve and the emergency bleeding valve, and the stop valve, the emergency bleeding valve, the flowmeter and the VOCs online detection device are all connected with a controller; a storage tank is arranged between the dryer and the emergency relief valve, an opening is formed in the upper end of the storage tank, an openable cover is arranged on the opening, or an openable air distribution port is formed in the top of the storage tank; the flow meter is used for detecting the flow of VOCs in a conveying pipeline before entering the coke oven; the VOCs online detection device is used for detecting the ammonia concentration, the hydrogen sulfide concentration, the benzene concentration and the oxygen concentration in a conveying pipeline before entering a coke oven, controlling the ammonia concentration in the conveying pipeline before entering the coke oven to be not more than an upper limit value A, the hydrogen sulfide concentration to be not more than an upper limit value B and the benzene concentration to be not more than an upper limit value C, controlling an emergency bleeding valve to be in an open state and a stop valve to be in a closed state when the ammonia concentration, the hydrogen sulfide concentration and the benzene concentration are not more than the upper limit value C, opening an opening or an air distribution port at the upper end of a storage tank, adjusting the waste gas concentration and the content of various waste gases in the storage tank, further controlling the waste gas concentration and the content of various gases entering the coke oven from a dryer. In addition, the scheme is provided with control interlocking measures and emergency plans for various abnormal working conditions which may influence production.
Drawings
Fig. 1 is a schematic structural diagram of a coking chemical waste gas treatment process monitoring system provided in this embodiment.
1-a biochemical pool; 2-a salt extraction zone; 3-sealing the waste gas collecting device; 4-a fan; 5-flame arrestors; 6-a detector; 7-emergency three-way valve; 8-an alarm controller; 9-a turbine absorber; 10-a dryer; 11-a storage tank; 12-emergency relief valve; 13-a flow meter; 14-VOCs on-line detection device; 15-a shut-off valve; 16-a coke oven; 17-a controller.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in figure 1, the coking chemical product waste gas treatment process monitoring system provided by the scheme comprises a cooling section and a desulfurization ammonium sulfate section, wherein the cooling section and the desulfurization ammonium sulfate section respectively comprise a biochemical pool 1 and a salt extraction area 2, waste gas discharge ports of the biochemical pool 1 and the salt extraction area 2 are respectively provided with a sealed waste gas collecting device 3, each sealed waste gas collecting device 3 is respectively communicated with a branch pipeline, each branch pipeline is respectively communicated with a main pipeline, the other end of the main pipeline is connected with an inlet of a fan 4, and the fan 4, a turbine absorber 9, a dryer 10 and a coke oven 16 are sequentially communicated through conveying pipes.
A cut-off valve 15, an emergency bleeding valve 12, a flowmeter 13 and a VOCs online detection device 14 are arranged on a conveying pipeline connecting the drying machine 10 and the coke oven 16, the cut-off valve 15 is positioned at one end close to the coke oven 16, the emergency bleeding valve 12 is positioned at one end close to the drying machine 10, the flowmeter 13 and the VOCs online detection device 14 are positioned between the cut-off valve 15 and the emergency bleeding valve 12, and the cut-off valve 15, the emergency bleeding valve 12, the flowmeter 13 and the VOCs online detection device 14 are all connected with a controller 17.
A storage tank 11 is arranged between the dryer 10 and the emergency bleeding valve 12, an opening is arranged at the upper end of the storage tank 11, an openable cover is arranged on the opening, or an openable air distribution opening is arranged at the top of the storage tank 11.
The flowmeter 13 is used for detecting the flow of VOCs in the conveying pipeline before entering the coke oven 16, so that the flow of VOCs in the conveying pipeline does not exceed the preset upper flow limit. According to the scheme, biochemical treatment chimney waste gas is introduced into the coke oven 16 for combustion, the flowmeter 13 is additionally arranged to monitor the biochemical waste gas flow, the collection effect is ensured, and meanwhile, the low-nitrogen combustion waste gas circulating system of the coke oven 16 is not influenced.
The VOCs online detection device 14 is used for detecting the ammonia concentration, the hydrogen sulfide concentration, the benzene concentration and the oxygen concentration in a conveying pipeline before entering the coke oven 16, controlling the ammonia concentration in the conveying pipeline before entering the coke oven 16 not to exceed an upper limit value A, controlling the hydrogen sulfide concentration not to exceed an upper limit value B, and controlling the benzene concentration not to exceed an upper limit value C, and when the ammonia concentration, the hydrogen sulfide concentration and the benzene concentration exceed the upper limit value A, the controller 17 controls the emergency bleeding valve 12 to be in an open state, and controls the cut-off valve 15 to be in a closed state. Because the cut-off valve 15 is in a closed state, the waste gas is not conveyed into the coke oven 16 through the conveying pipeline, and the waste gas input into the coke oven 16 is prevented from generating excessive nitrogen oxides and being discharged into the air for secondary pollution due to the fact that the content of certain gases exceeds the standard. The opening can be exposed by opening the cover at the upper end of the storage tank 11, so that outside air enters the storage tank 11 and is mixed with waste gas in the storage tank 11, or air enters the storage tank 11 by opening the air distribution port at the top of the storage tank 11, the content of the gas in the storage tank 11 is changed, and the reduction of the concentration of the overproof gas in the storage tank 11 is realized.
In this embodiment, as a preferable scheme, the value of the upper limit value a is 350mg/m3The upper limit value B is 300mg/m3The upper limit value C is 500 ppm. Of course, the above values are only the most suitable solutions, and the values of the upper limit value a, the upper limit value B, and the upper limit value C are not limited to the above values.
In this embodiment, as a preferable scheme, a pressure transmitter and an automatic pressure control device are respectively disposed at the end of the biochemical pool 1 and the salt extracting area 2, and both the pressure transmitter and the automatic pressure control device are connected to the controller 17.
The pressure transmitter is an instrument which receives pressure variable, converts the pressure variable into a standard output signal according to a certain proportion after sensing conversion. The device is used for centralized monitoring, alarming and adjusting to ensure that each discharge point is always in a micro-negative pressure state, and the total amount of VOCs produced by chemical production is relatively stable while the collection requirement of each discharge point is met. The pressure transmitter transmits the standard output signal to the controller 17, the controller 17 judges after receiving the standard output signal transmitted by the pressure transmitter, and if the standard output signal exceeds the upper limit of the preset value, the pressure automatic control device is controlled to adjust the pressure of the discharge points, so that the discharge points are ensured to be in a micro-negative pressure state all the time.
In the present embodiment, a flame arrester 5 is preferably disposed at the outlet of the fan 4. Flame arrestor 5 is a safety device used to prevent the spread of flames of flammable gases and flammable liquid vapors. The device for preventing the passage of a propagating flame (deflagration or detonation), which is generally installed in a conduit for transporting combustible gases, or in a ventilated tank, consists of a flame-retardant core, a flame-retardant casing and accessories.
In this embodiment, as a further preferable scheme, a combustible gas alarm is further disposed at the outlet of the fan 4, and an emergency three-way valve 7 is disposed on a delivery pipe connected to the outlet of the fan 4. The combustible gas alarm instrument comprises an alarm controller 8 and a detector 6, wherein the detector 6 and the emergency three-way valve 7 are respectively connected with the alarm controller 8 through cables.
The alarm controller 8 can be placed in a duty room to mainly control each monitoring point, the detector 6 is installed at a place where combustible gas is most prone to leakage, a core component of the detector is a built-in combustible gas sensor, and the sensor detects the concentration of gas in the air. The detector 6 converts the gas concentration detected by the sensor into an electric signal, the electric signal is transmitted to the alarm controller 8 through a cable, the higher the gas concentration is, the stronger the electric signal is, when the gas concentration reaches or exceeds an alarm point set by the alarm controller 8, the alarm controller 8 controls the alarm to send out an alarm signal, and the emergency three-way valve 7 can be started to automatically eliminate hidden dangers.
Specifically, when the combustible gas alarm detects that the concentration of the waste gas in the conveying pipe exceeds the lower explosion limit preset value E, the emergency three-way valve 7 is in an open state, and the waste gas is discharged through the emergency three-way valve 7. The humidified exhaust gas is sent to a coke oven 16 by a blower to be incinerated.
Wherein the value of E is 25%. Of course, 25% is only a preferred value and is not limited to this value.
In this embodiment, as a preferable mode, nitrogen seal devices are provided on the crude benzene tank, the lean oil tank and the rich oil tank of the desulfurization ammonium sulfate section. Because the crude benzene system does not enter the coke oven 16 for combustion, the benzene volatilization can be controlled by modifying the existing treatment system, and the safety and reliability of the system are ensured.
In the present embodiment, it is preferable that the crude benzene tank, the lean oil tank, and the rich oil tank, each of which is provided with a nitrogen seal device, be provided with a remote pressure monitoring device, and all of the remote pressure monitoring devices be connected to the controller 17. The remote pressure monitoring device detects the outlet pressure of the irrigation tank, sends a detection signal to the controller 17, and the controller 17 sends a signal to the remote pressure monitoring device as required by the judgment of the controller 17, and then adjusts the outlet pressure of the crude benzene tank, the lean oil tank and the rich oil tank through the remote pressure monitoring device.
In this embodiment, the original washing apparatus is kept, but the washing function is adjusted. Wherein, the drum cooling workshop section remains oil washing and washing function, and desulfurization ammonium sulfate workshop section collection system remains the washing function, and sealed exhaust gas collection device 3 respectively adds one set of mist trap simultaneously.
The above are only typical examples of the present invention, and besides, the present invention may have other embodiments, and all the technical solutions formed by equivalent substitutions or equivalent changes are within the scope of the present invention as claimed.
Claims (9)
1. A coking chemical product waste gas treatment process monitoring system is characterized in that a sealed waste gas collecting device is respectively arranged at a waste gas discharge port of a biochemical pool and a salt extraction area, and the sealed waste gas collecting device, a fan, a turbine absorber, a dryer and a coke oven are sequentially communicated through a conveying pipe;
a cut-off valve, an emergency bleeding valve, a flowmeter and a VOCs online detection device are arranged on a conveying pipeline connecting the drying machine and the coke oven, the cut-off valve is positioned at one end close to the coke oven, the emergency bleeding valve is positioned at one end close to the drying machine, the flowmeter and VOCs online detection device is positioned between the cut-off valve and the emergency bleeding valve, and the cut-off valve, the emergency bleeding valve, the flowmeter and the VOCs online detection device are all connected with a controller;
the flow meter is used for detecting the flow of VOCs in a conveying pipeline before entering the coke oven;
the VOCs online detection device is used for detecting the ammonia concentration, the hydrogen sulfide concentration, the benzene concentration and the oxygen concentration in a conveying pipeline before entering the coke oven, controlling the ammonia concentration in the conveying pipeline before entering the coke oven not to exceed an upper limit value A, the hydrogen sulfide concentration not to exceed an upper limit value B and the benzene concentration not to exceed an upper limit value C, and when the ammonia concentration, the hydrogen sulfide concentration and the benzene concentration exceed the upper limit value C, the controller controls the emergency bleeding valve to be in an open state and controls the cut-off valve to be in a closed state;
a storage tank is arranged between the dryer and the emergency bleeding valve, an opening is formed in the upper end of the storage tank, an openable cover is arranged on the opening, or an air distribution opening is formed in the top of the storage tank.
2. The system for monitoring the coking chemical production waste gas treatment process according to claim 1, wherein a pressure transmitter and an automatic pressure control device are respectively arranged at the tail ends of the biochemical pool and the salt extraction area, and the pressure transmitter and the automatic pressure control device are connected with a controller.
3. The system for monitoring the coking chemical production waste gas treatment process according to claim 1, wherein nitrogen sealing devices are arranged on the crude benzene tank, the lean oil tank and the rich oil tank of the ammonium sulfate desulfurization section.
4. A coking chemical waste gas treatment process monitoring system according to claim 3, characterized in that the crude benzene tank, the lean oil tank and the rich oil tank provided with nitrogen seals are provided with remote pressure monitoring devices, and all the remote pressure monitoring devices are connected with the controller.
5. A coking chemical waste gas treatment process monitoring system according to claim 1, characterized in that a set of mist traps is arranged in each of the sealed waste gas collecting devices.
6. The coking chemical waste gas treatment process monitoring system of claim 1, wherein a flame arrester is disposed at the fan outlet.
7. The coking chemical waste gas treatment process monitoring system of any one of claims 1 to 6, wherein a combustible gas alarm instrument is further arranged at the outlet of the fan, and an emergency three-way valve is arranged on a conveying pipe connected with the outlet of the fan.
8. The coking chemical production waste gas treatment process monitoring system of claim 7, wherein the combustible gas alarm comprises an alarm controller and a detector, and the detector and the emergency three-way valve are respectively connected with the alarm controller through cables.
9. The coking chemical production waste gas treatment process monitoring system of claim 1, wherein the upper limit value A is 350mg/m3The upper limit value B is 300mg/m3The upper limit value C is 500 ppm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110280102.3A CN113025359A (en) | 2021-03-16 | 2021-03-16 | Coking chemical product waste gas treatment process monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110280102.3A CN113025359A (en) | 2021-03-16 | 2021-03-16 | Coking chemical product waste gas treatment process monitoring system |
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2021
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| KR20020083413A (en) * | 2001-12-13 | 2002-11-02 | 문준식 | VOC omitted |
| CN105823065A (en) * | 2016-05-26 | 2016-08-03 | 安徽绿雅环境工程有限公司 | Treatment device for flammable and explosive high-concentration multi-component organic waste gas |
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Application publication date: 20210625 |