CN105067776A - Safe pretreating method for volatile organic compound treatment - Google Patents
Safe pretreating method for volatile organic compound treatment Download PDFInfo
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- CN105067776A CN105067776A CN201510496141.1A CN201510496141A CN105067776A CN 105067776 A CN105067776 A CN 105067776A CN 201510496141 A CN201510496141 A CN 201510496141A CN 105067776 A CN105067776 A CN 105067776A
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Abstract
The invention relates to a safe pretreating method for volatile organic compound treatment, and mainly solves the problem that in the prior art, the potential safety hazard is large. The adopted technical scheme is as follow: through the adoption of the safe pretreating method for volatile organic compound treatment, hot air or dry air is introduced into a gas mixing chamber through a diluent air pipeline; an adjustable and automatic valve is arranged on the diluent air pipeline, so as to control the air amount of air entering a pretreating system; proportion integral adjustment is achieved according to the measured temperature of a low-temperature catalytic oxidation bed outlet, when the temperature of the low-temperature catalytic oxidation bed outlet is higher than a set value, the aperture of the adjustable and automatic valve is properly enlarged, and on the contrary, the aperture of the valve is properly turned down; the before and after gas concentrations of the pretreating system are measured in real time through an on-line concentration analyzer, and if the gas concentration after ptetreatment is 25% higher than the lower limit of the explosion limit of mixed gases, the aperture of the adjustable and automatic valve is enlarged at the same time. Through the adoption of the technical scheme, the problem is well solved, and the safe pretreating method can be used in volatile organic compound treatment.
Description
Technical field
The present invention relates to a kind of safety preprocessing method administered for volatile organic matter.
Background technology
The Treatment process of current volatile organic matter (VOCs) mainly contains two classes: a class is recovery technology, and a class is destroy technology.Recovery technology is the method by physics, such as, change temperature, pressure or take the method for the method such as selective absorbent and permoselective membrane concentration and separation organic vapors pollutant, mainly contain adsorption technology, absorption techniques, condensation technology and membrane separation technique.Destroy technology is mainly through chemistry or biochemical reaction, with heat, light, catalyzer and microorganism, organic compound is changed into the inorganic molecules compound of the nonhazardous such as carbon dioxide and water or low murder by poisoning, mainly contain direct combustion method, catalytic combustion, bio-oxidation, photochemical catalytic oxidation, plasma destruction etc.
The VOCs gas that recovery technology is higher mainly for concentration or economic worth is high reclaims, and the requirement that can meet national environmental standard in some field directly enters in air.And destroy technology is when mainly cannot reach standard-required for recovery technology and the VOCs Treatment process taked." discharge standard of air pollutants " requires non-methane hydrocarbon emission concentration≤120mg/m
3, some regional provincial standards require non-methane hydrocarbon emission concentration≤80mg/m
3, suggestions such as " petro chemical industry pollutant emission standards " solicits original text requirement benzene discharge index≤1mg/m
3, recovery technology is to reach above standard, then technology is very difficult on realizing, and need reach standard further in conjunction with destroy technology.
But direct combustion method operating temperature is up to 800 DEG C in current destroy technology, and equipment cost is high, in refining enterprise application process, there is potential safety hazard; The organic contaminant occasion that major part catalytic combustion technology is not suitable with for high concentration need carry out pre-service, and because catalyst operating temperature is substantially at about 400 DEG C, higher than most of organism initiation temperature, also there is the danger of blast on using.If carry out dilution pre-service to organic contaminant, then the heat temperature raising of air is needed to the heat energy (electrical heating or fuel heating) of at substantial, in the VOCs of Wind Volume/low concentration administers, operating cost is too high, causes energy dissipation.
Summary of the invention
Technical matters to be solved by this invention is the problem that in prior art, potential safety hazard is large, provides a kind of safety preprocessing method administered for volatile organic matter newly.The method is used for during volatile organic matter administers, having without potential safety hazard, initiation temperature is low, energy consumption is little advantage.
For solving the problem, the technical solution used in the present invention is as follows: a kind of safety preprocessing method administered for volatile organic matter, hot-air or dry air are introduced gas mixer chamber by diluent air pipeline, diluent air pipeline arranges adjustable automatic valve, the air capacity of pretreatment system is entered by the control of described adjustable automatic valve, the measuring tempeature exported with low-temperature catalytic oxidation bed realizes PI (proportional integral) and regulates, if low-temperature catalytic oxidation bed outlet temperature is higher than setting value, then suitably increase adjustable automatic valve aperture, otherwise then suitably turn down valve opening, simultaneously by the gas concentration before and after the real-time Measurement preprocessing system of online concentration analyzer, if pretreated gas concentration is higher than 25% of Mixed Gases Explosion limit lower limit, then increase adjustable automatic valve aperture simultaneously.
In technique scheme, preferably, described gas mixer chamber is provided with volatile organic matter gas and enters pipeline, volatile organic matter gas air inlet fan pipeline.
This patent, under the effect of pretreatment system and online concentration analyzer, remains that the concentration of mixed gas is in the scope of the lower limit 25% of explosion limits; Do not take pretreated direct burning and other catalytic oxidation technologies securities higher, achieve good technique effect.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the method for the invention.
Fig. 2 is pretreatment system schematic flow sheet.
In Fig. 1, Fig. 2,1 is VOCs high concentration treating apparatus; 2 is pretreatment system; 3 is blower fan; 4 is variable valve; 5 is diluent air pipeline; 6 is heating chamber; 7 is low-temperature catalytic oxidation layer; 8 is high-temperature S removal layer; 10 is online concentration analyzer; 11 is chimney; 12 is rotary type honeycomb ceramic heat accumulator; 2a is adjustable automatic valve; 2b is gas mixer chamber, and 2c is mixed gas air inlet fan pipeline; 2d is VOCs gas inlet pipeline.
Below by embodiment, the invention will be further elaborated, but be not limited only to the present embodiment.
Embodiment
[embodiment 1]
A kind of safety preprocessing method administered for volatile organic matter, as shown in Figure 1, 2, pretreatment system comprises gas mixer chamber, variable valve, online concentration analyzer, gas mixer chamber is provided with diluent air source line, volatile organic matter gas enters pipeline, volatile organic matter gas air inlet fan pipeline, diluent air source line is provided with adjustable automatic valve, and the temperature measurement equipment that adjustable automatic valve is exported by signal wire and low-temperature catalytic oxidation bed is connected.
Hot-air or dry air are introduced gas mixer chamber by diluent air pipeline, diluent air pipeline arranges adjustable automatic valve, the air capacity of pretreatment system is entered by the control of described adjustable automatic valve, the measuring tempeature exported with low-temperature catalytic oxidation bed realizes proportional integral and regulates, if low-temperature catalytic oxidation bed outlet temperature is higher than setting value, then suitably increase adjustable automatic valve aperture, otherwise then suitably turn down valve opening; Simultaneously by the gas concentration before and after the real-time Measurement preprocessing system of online concentration analyzer, if pretreated gas concentration is higher than 25% of Mixed Gases Explosion limit lower limit, then increase adjustable automatic valve aperture simultaneously.
Adopt flow process as shown in Figure 1 to carry out VOCs gas recycling and administration, flow process is moved towards: VOCs high concentration retracting device → Safety Pre treating apparatus → blower fan → rotary type honeycomb ceramic heat accumulator cold journey → well heater → low-temperature catalytic oxidation bed → hot journey → chimney of high-temperature S removal bed → rotary type honeycomb ceramic heat accumulator.
VOCs high concentration retracting device can be adsorption system, condensate recovery system, film separation system etc., is mainly used in reclaiming concentration and reaches 100g/m
3~ 1000g/m
3above high concentration VOCs gas.Pretreatment system (as shown in Figure 2) is made up of the adjustable automatic valve (2a) on diluent air pipeline and gas mixer chamber (2b), be mainly used in the VOCs gas diluting low concentration, its concentration is down in the safe range of low-temperature catalytic oxidation device use.By variable frequency work, blower fan remains that its blower fan leading inlet is in the working range of pressure-fired.Variable valve (4) for regulating gas temperature in export pipeline after heat interchanger, and coordinates with well heater gas in pipeline was in rational working range before entering low-temperature catalytic oxidation bed; Low-temperature catalytic oxidation layer, high-temperature S removal layer, rotary type honeycomb ceramic heat accumulator eliminate VOCs gas for purifying, and make its concentration be down to needed for below the standard-required that reaches; Online concentration analyzer is for monitoring supplied materials gas concentration, catalytic oxidation front reaction concentration and escape hole concentration; System detects the concentration of the system of entering, temperature and fluctuations in discharge situation in real time, and online concentration analyzer measures explosion-proof fan front and back ends concentration levels in real time.When blower fan rear end VOCs concentration higher than lower explosive limit 25% time, then the adjustable automatic valve (2a) of pretreatment system strengthens dilution dynamics, its concentration is down in less than 25% of lower explosive limit, low-temperature catalytic oxidation system is within safe operating range all the time.Chimney is mainly used in emission compliance gas; Rotary type honeycomb ceramic heat accumulator can be divided into different bin, and heat storage drives lower rotation by rotary motor.The heat storage of mixed gas first in the bin of accumulation of heat, thus the heat taking away heat storage reaches required catalytic temperature; Heat storage simultaneously in other bins is for reclaiming the heat of high temperature purification gas.
Power-supply unit mainly blower fan and well heater in system, in addition respective line and equipment are provided with temperature, flow, pressure and Concentration Testing transmitter, each detection signal and control variable are collected and are entered PLC (programmable logic controller (PLC)) control system, and control whole system by monitoring computer and run.By monitoring computer startup optimization system, first well heater starts working, and when well heater reaches the temperature of default, explosion-proof fan is started working, and VOCs gas enters low-temperature catalytic oxidation governing system by front end high concentration retracting device.
Monitoring computer monitors VOCs gas temperature after rotary type honeycomb ceramic heat accumulator in real time simultaneously, and when temperature is temperature required lower than low-temperature catalytic oxidation bed, well heater is started working; When temperature is higher than low-temperature catalytic oxidation bed temperature, variable valve (4) regulates aperture in real time, reduces VOCs gas temperature, makes in its operating temperature range maintained required for low-temperature catalytic oxidation bed; VOCs gas is after low-temperature oxidation bed, and the VOCs gas of more than 90% is broken down into CO in low-temperature catalytic oxidation bed
2and H
2o, simultaneously releases heat enter high-temperature S removal bed, simultaneously when now gas temperature is higher, pretreatment system increases dilution dynamics, reduces VOCs gaseous combustion temperature; Fill in high-temperature S removal bed and be different from the high temperature catalyst that the precious metals pt of low-temperature catalytic oxidation bed etc. is representative, required for this catalyzer, working temperature is temperature required higher than low-temperature catalytic oxidation bed.Residue small part VOCs gas resolves into CO further in this interval
2and H
2o, releases heat enters rotary type honeycomb ceramic heat accumulator simultaneously, and in rotary type honeycomb ceramic heat accumulator, further high-temp combustion, reaches the treatment effeciency of more than 99%.
To process the oil gas of gasoline volatilization, inlet concentration is 60g/m
3normal temperature petrol gas, after system pre-service, concentration dilution is 6g/m
3(25% of the lower limit of explosion limits is 9.4g/m
3), lower than explosion limits lower limit 25%, after the heat exchange of rotary type honeycomb ceramic heat accumulator, temperature is increased to about 230 DEG C, and now well heater quits work, after the process of low-temperature catalytic oxidation bed, high-temperature S removal bed and ceramic heat storage body, exit concentration can reach 80mg/m
3below, treatment effeciency reaches more than 99%.
Realize uniting two into one of accumulation of heat and heat exchange by airtight rotary type honeycomb ceramic heat accumulator, which can improve heat exchange efficiency, improves heat storage capacity.By the rotation motor of rotary type honeycomb ceramic heat accumulator, drive heat accumulator rotary.When a certain heat storage of rotary type heat storage uses as heat accumulation function, not only can purifying VOCs gas further, and can accumulation of heat be carried out, carry out heat recovery utilization; Now another heat storage accumulation of heat complete waiting system heat exchange; And also have a heat storage to heat to supplied materials VOCs gas.
This patent, under the effect of pretreatment system and online concentration analyzer, remains that the concentration of mixed gas is in the scope of the lower limit 25% of explosion limits; Do not take pretreated direct burning and other catalytic oxidation technologies securities higher, achieve good technique effect.
Claims (2)
1. the safety preprocessing method administered for volatile organic matter, hot-air or dry air are introduced gas mixer chamber by diluent air pipeline, diluent air pipeline arranges adjustable automatic valve, the air capacity of pretreatment system is entered by the control of described adjustable automatic valve, the measuring tempeature exported with low-temperature catalytic oxidation bed realizes proportional integral and regulates, if low-temperature catalytic oxidation bed outlet temperature is higher than setting value, then suitably increase adjustable automatic valve aperture, otherwise then suitably turn down valve opening; Simultaneously by the gas concentration before and after the real-time Measurement preprocessing system of online concentration analyzer, if pretreated gas concentration is higher than 25% of Mixed Gases Explosion limit lower limit, then increase adjustable automatic valve aperture simultaneously.
2. a kind of safety preprocessing method administered for volatile organic matter according to claim 1, is characterized in that described gas mixer chamber is provided with volatile organic matter gas and enters pipeline, volatile organic matter gas air inlet fan pipeline.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106918637A (en) * | 2017-04-14 | 2017-07-04 | 中国石油化工股份有限公司 | The online total hydrocarbon concentration monitoring device and method of gas treatment equipment |
| CN107489883A (en) * | 2017-10-13 | 2017-12-19 | 中石化炼化工程（集团）股份有限公司 | Petroleum chemical enterprise VOCs collection and carrying method and centralized processing system |
| CN108144436A (en) * | 2016-12-05 | 2018-06-12 | 中国石油化工股份有限公司 | A kind of security processing and device of petrifaction sewage Treatment stations discharge exhaust gas |
| CN108926974A (en) * | 2017-05-24 | 2018-12-04 | 中国石油化工股份有限公司 | A kind of security protection technique for VOCs Treatment process |
| CN113209820A (en) * | 2021-05-14 | 2021-08-06 | 宁波中瑞环保科技有限公司 | Process for treating low-air-volume VOCs waste gas by cryogenic serial catalytic oxidation |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108144436A (en) * | 2016-12-05 | 2018-06-12 | 中国石油化工股份有限公司 | A kind of security processing and device of petrifaction sewage Treatment stations discharge exhaust gas |
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| CN108926974A (en) * | 2017-05-24 | 2018-12-04 | 中国石油化工股份有限公司 | A kind of security protection technique for VOCs Treatment process |
| CN107489883A (en) * | 2017-10-13 | 2017-12-19 | 中石化炼化工程（集团）股份有限公司 | Petroleum chemical enterprise VOCs collection and carrying method and centralized processing system |
| CN113209820A (en) * | 2021-05-14 | 2021-08-06 | 宁波中瑞环保科技有限公司 | Process for treating low-air-volume VOCs waste gas by cryogenic serial catalytic oxidation |
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Address after: Yanan City, Shandong province Qingdao City three road 266071 No. 218 Applicant after: Sinopec Corp. Applicant after: Qingdao Safety Engineering Research Institute of Sinopec Co., Ltd. Address before: 100728 Chaoyangmen street, Beijing, No. 22, No. Applicant before: Sinopec Corp. Applicant before: Qingdao Safety Engineering Research Institute of Sinopec Co., Ltd. |
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Application publication date: 20151118 |