CN108654340A - Cokingization produces VOCs exhaust gas thermal oxidation new processes and processing unit - Google Patents

Cokingization produces VOCs exhaust gas thermal oxidation new processes and processing unit Download PDF

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Publication number
CN108654340A
CN108654340A CN201810488481.3A CN201810488481A CN108654340A CN 108654340 A CN108654340 A CN 108654340A CN 201810488481 A CN201810488481 A CN 201810488481A CN 108654340 A CN108654340 A CN 108654340A
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China
Prior art keywords
exhaust gas
thermal oxidation
regenerative chamber
vocs
cokingization
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CN201810488481.3A
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Chinese (zh)
Inventor
钱仲瑛
陈泉明
方文新
秦文涛
陈年连
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SHANGHAI MEISHAN INDUSTRY CIVIL ENGINEERING DESIGN RESEARCH INSTITUTE Co Ltd
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SHANGHAI MEISHAN INDUSTRY CIVIL ENGINEERING DESIGN RESEARCH INSTITUTE Co Ltd
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Priority to CN201810488481.3A priority Critical patent/CN108654340A/en
Publication of CN108654340A publication Critical patent/CN108654340A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/72Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/70Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/708Volatile organic compounds V.O.C.'s

Abstract

The invention discloses cokingization production VOCs exhaust gas thermal oxidation new processes and processing units, including:After VOCs exhaust gas is pre-processed by washing oil absorption plant, preheated, decomposition and scavenging cycle thermal oxidation, then detached and post-processed;RTO thermal oxidation furnaces are used for coking industry VOCs exhaust-gas treatments, VOCs exhaust gas still not up to standard carries out RTO thermal oxides after being pre-processed to absorption, and VOCs exhaust gas removal rates reach 99%, meet《Coking chemistry emission of industrial pollutants standard》Emission limit requirement in (GB16171 2012).

Description

Cokingization produces VOCs exhaust gas thermal oxidation new processes and processing unit
Technical field
The invention belongs to chemical emission process fields, and in particular to a kind of cokingization production new work of VOCs exhaust gas thermal oxidations Skill and processing unit.
Background technology
Existing coking producing region domain process units includes that 3# tar distillations, tar medial launder area, oil depot device, oil product are matched System, oil depot West, dephenolize and crude naphthalene, phenol salt de, phenol distillation, naphthalene sheeting and modified coal tar pitch, material and life in production process It is different to produce device, the Exhaust gas species of generation are various, distinct, and occurring source feature is also not quite similar.Wherein, cokingization produces exhaust gas Main component is volatile organic matter VOCs, including non-methane total hydrocarbons, benzene class, phenols and naphthalene etc., also contains a small amount of hydrogen sulfide, halogen Compound, the main harm of VOCs exhaust gas are to generate photochemical fog with reaction of nitrogen oxides in an atmosphere, are detrimental to health, and And situations such as also containing noxious material, easily leading to poisoning, occurs, in addition most of VOCs are inflammable and explosive, in the case where concentration reaches explosion It easily explodes in limited time and causes fire.
VOCs waste gas processing methods are varied, and common method mainly has condensing recovery method, absorption process, absorption method and electricity to remove Dirt etc., these methods have certain limitation, costly, life cycle is shorter, while absorbent, adsorbent may bring two Secondary pollution.Process units VOCs exhaust-gas treatments in coking producing region domain use absorption technique at present, are absorbed in exhaust gas using washing oil The nuisances such as benzene class and phenols, but the non-methane total hydrocarbons in exhaust gas cannot be removed, dispersing gas process is also easy to entrainment washing oil drop, Cause non-methane total hydrocarbons in exhaust gas higher, Pollutant emission concentration cannot reach in outer waste air《Coking chemistry industrial pollutants Discharge standard》(GB16171-2012) requirement of emission limit, it can be seen that cokingization produces the characteristics of process units VOCs exhaust gas It is that complex in composition, recovery difficult and recovery value are smaller, discharging standards cannot be met using single treatment method.In addition, The VOCs waste gas treatment process of the industries such as existing application, printing and dyeing, petrochemical industry is not perfect to safety measure consideration, therefore VOCs exhaust gas Security system design is particularly important in processing procedure.
Bibliography:
[1] volatile organic matter pollution control engineering, Li Shouxin etc., Chemical Industry Press, 2017.
[2] progress of volatile organic compounds treatment technology, Li Shouxin etc., chemical industry environmental protection, 2008.
[3] Wind Volume VOCs waste gas pollution control and treatments, Qiao Huixian etc., environmental project, 2004.
Invention content
To overcome the drawbacks described above of the prior art, solving existing cokingization production station-service absorption process processing VOCs exhaust gas cannot Meet the problem of national standard is to pollutant emission limit requirement, the purpose of the present invention is to provide a kind of safe and reliable coking Change production VOCs exhaust gas thermal oxidation new processes and processing unit, is domestic the first by RTO thermal oxidation furnace (heat accumulation type thermal oxidations Stove) coking industry VOCs exhaust-gas treatments are used for, VOCs exhaust gas still not up to standard carries out RTO thermal oxides after being pre-processed to absorption, VOCs discards removal rate and reaches 99%, meets《Coking chemistry emission of industrial pollutants standard》(GB16171-2012) " air in The special emission limit of pollutant " requirement.
The above-mentioned purpose of the present invention is achieved through the following technical solutions:
Cokingization produces VOCs waste gas heat oxidation treatment devices, includes successively:Washing oil absorptive unit, the control of FTA safety interlockings Unit, thermal oxidation unit and separative element;Wherein,
Described FTA safety interlockings control unit one end be placed in the washing oil absorptive unit and the anti-explosion fire-retardant liquid packing it Between, the other end is connected with the thermal oxidation unit inlet end;
The thermal oxidation unit includes anti-explosion fire-retardant liquid packing, mist eliminator, surge tank, several exhaust gas master successively Wind turbine and spark arrester and RTO thermal oxidation furnaces;The anti-explosion fire-retardant liquid packing, mist eliminator and surge tank are sequentially communicated, if described A dry exhaust gas main air blower is connected in parallel, and one end is respectively communicated with the surge tank outlet side, the other end and the spark arrester air inlet The corresponding connection in end;RTO thermal oxidation furnaces one end is connect with the spark arrester outlet side, and the other end connects with the separative element It is logical.
Preferably, by flammable gas explosion concentration limit detector, (FTA is detected the FTA safety interlockings control unit Instrument), exhaust gas pneumatic cut-off valve and accident diffuse pneumatic cut-off valve composition.
Preferably, the RTO thermal oxidation furnaces include the first regenerative chamber that can be used for VOCs heating by the exhaust gases, decomposition and scavenging, Second regenerative chamber and third regenerative chamber, and first regenerative chamber, the second regenerative chamber and third regenerative chamber can pass through reversal valve Control VOCs waste gas flow directions.
Preferably, above-mentioned cokingization production VOCs waste gas heat oxidation treatment devices further include being connected with the RTO thermal oxidation furnaces Purging motor and the burner that is connected to RTO thermal oxidation furnaces upper end.
The second aspect of the present invention, cokingization produce VOCs exhaust gas thermal oxidation new processes, specifically, including following step Suddenly:
(1) VOCs exhaust gas is pre-processed by washing oil absorption plant;
(2) in step (1) pretreated VOCs exhaust gas it is preheated, decompose and scavenging cycle thermal oxidation;
(3) the gas separation and post-processing after step (2) thermal oxidation.
Preferably, the thermal oxidation process is:
VOCs exhaust gas is successively through anti-explosion fire-retardant liquid packing, mist eliminator and surge tank under exhaust gas main air blower suction, into Enter RTO thermal oxidation furnace internal heating oxidation resolution process;Wherein, VOCs exhaust gas first switches into first accumulation of heat by the reversal valve Room is heated to be high-temp waste gas;Second regenerative chamber is entered back into, is that 800-850 DEG C of pyrolytic is formed containing CO in temperature2And H2O High-temperature flue gas;The third regenerative chamber is entered back into, the sensible heat of above-mentioned high-temperature flue gas is stored in the pottery of the third regenerative chamber It is discharged or enters through the reversal valve in porcelain heat storage, after being cooled to 180-220 DEG C and recycle thermal oxidation next time.
Preferably, the cycling hot oxidation processes are specially:It preheats (the first regenerative chamber)-and decomposes (the second accumulation of heat Room)-scavenging (third regenerative chamber)-scavenging (the first regenerative chamber)-preheating (the second regenerative chamber)-decomposition (third regenerative chamber)-decomposition (the first regenerative chamber)-scavenging (the second regenerative chamber)-preheats (third regenerative chamber), repeats several times.
In some preferred embodiments, the cycle thermal oxidation includes that preheating (the first regenerative chamber)-decomposes (the Two regenerative chambers)-scavenging (third regenerative chamber)-scavenging (the first regenerative chamber)-preheating (the second regenerative chamber)-decomposition (third accumulation of heat Room)-(the first regenerative chamber)-scavenging (the second regenerative chamber)-preheating (third regenerative chamber) cyclic process three times is decomposed, ensure that VOCs is gone Except rate is to qualified discharge.
In some preferred embodiments, in FTA safety interlockings control unit, the FTA detectors are real-time to exhaust gas Sampling and detection, reach 25% alarm of explosion ratio lower limiting value, close the exhaust gas stop valve when reaching 50%, described in opening Accident diffuses pneumatic cut-off valve, realizes that safety interlocking control, the VOCs exhaust gas for avoiding explosion ratio lower limiting value larger are introduced in In high temperature RTO thermal oxidation furnaces.
In some preferred embodiments, the non-methane after the cycle thermal oxidation in cokingization production VOCs exhaust gas Total hydrocarbon concentration is no more than 5000mg/m3, VOCs waste gas burning efficiency reaches 99% or more, VOCs total amounts≤19.9mg/m3, non-first Alkane total hydrocarbon emissions concentration < 50mg/m3, benzene concentration of emission < 6mg/m3, discharged nitrous oxides concentration < 20mg/m3
Compared with prior art, the beneficial effects of the present invention are:
After cokingization production VOCs exhaust gas thermal oxidation new processes through the invention, cokingization is produced non-in VOCs exhaust gas Methane total hydrocarbon concentration is no more than 5000mg/m3, VOCs waste gas burning efficiency reaches 99% or more, VOCs total amounts≤19.9mg/m3, Non-methane hydrocarbon emission concentration < 50mg/m3, benzene concentration of emission < 6mg/m3, discharged nitrous oxides concentration < 20mg/m3, discharge Concentration well below《Coking chemistry emission of industrial pollutants standard》(GB16171-2012) emission limit.
Description of the drawings
Fig. 1 is that the cokingization of the present invention produces VOCs exhaust gas thermal oxidation new equipment structural schematic diagrams;
Fig. 2 is the flow chart that cokingization of the present invention produces VOCs exhaust gas thermal oxidation new processes.
Specific implementation mode
The technical solution that the invention will now be described in detail with reference to the accompanying drawings, but protection scope of the present invention is not limited to following realities Apply example.
Referring to attached drawing 1, cokingization of the invention produces VOCs exhaust gas thermal oxidation new equipments, includes successively:Washing oil absorbs Unit, FTA safety interlockings control unit, thermal oxidation unit and separative element;Wherein, FTA safety interlockings control unit one End is placed between washing oil absorptive unit and anti-explosion fire-retardant liquid packing, and the other end is connected with thermal oxidation unit inlet end, by can Combustion concentration of gas explosion lower limit detector (FTA detectors), exhaust gas pneumatic cut-off valve and accident diffuse pneumatic cut-off valve composition. FTA detectors reach 25% alarm of explosion ratio lower limiting value, exhaust gas are closed when reaching 50% to exhaust gas real time sample and detection Stop valve, opening accident diffuse pneumatic cut-off valve, realize that safety interlocking control, the VOCs for avoiding explosion ratio lower limiting value larger are useless Gas is introduced in high temperature RTO thermal oxidation furnaces.
Thermal oxidation unit includes anti-explosion fire-retardant liquid packing, mist eliminator, surge tank, two exhaust gas main air blowers and two successively A spark arrester and RTO thermal oxidation furnaces;Anti-explosion fire-retardant liquid packing, mist eliminator and surge tank are sequentially communicated, two exhaust gas main air blowers It is connected in parallel, one end is respectively communicated with surge tank outlet side, other end connection corresponding with spark arrester inlet end;RTO thermal oxidation furnaces One end is connect with spark arrester outlet side, and the other end is connected to separative element.RTO thermal oxidation furnaces are pre- including can be used for VOCs exhaust gas Heat is decomposed and the first regenerative chamber, the second regenerative chamber and the third regenerative chamber of scavenging, and the first regenerative chamber, the second regenerative chamber and the Three regenerative chambers can control VOCs waste gas flow directions by reversal valve.In addition, apparatus of the present invention further include being connected with RTO thermal oxidation furnaces Purging motor and the burner that is connected to RTO thermal oxidation furnaces upper end.
Referring to attached drawing 2, cokingization produces VOCs exhaust gas thermal oxidation new processes, and detailed process is:VOCs exhaust gas is by washing After the pretreatment of oily absorption plant, VOCs exhaust gas is preheated, decomposes and the cycle thermal oxidation of scavenging, separation;Wherein, thermal oxide Processing procedure is:VOCs exhaust gas is successively through anti-explosion fire-retardant liquid packing, mist eliminator and surge tank under exhaust gas main air blower suction, Into RTO thermal oxidation furnace internal heating oxidation resolution process, first switch into the first regenerative chamber by reversal valve is heated to be height to VOCs exhaust gas Warm exhaust gas;The second regenerative chamber is entered back into, is that 800 DEG C of -850 DEG C of pyrolytics are formed containing CO in temperature2And H2The high-temperature flue gas of O;Again Into third regenerative chamber, the sensible heat of above-mentioned high-temperature flue gas is stored in the ceramic heat-storing body of third regenerative chamber, is cooled to 200 DEG C It is discharged or enters by reversal valve and recycle thermal oxidation next time;Cycling hot oxidation processes are specially:(first stores for preheating Hot cell)-decompose (the second regenerative chamber)-scavenging (third regenerative chamber)-scavenging (the first regenerative chamber)-preheating (the second regenerative chamber)-point Solution (third regenerative chamber)-is decomposed (the first regenerative chamber)-scavenging (the second regenerative chamber)-preheating (third regenerative chamber) and is circulated throughout three times Journey ensures VOCs removal rates to qualified discharge.It is real-time to exhaust gas by FTA detectors and before entering RTO thermal oxidation furnaces Sampling and detection, reach 25% alarm of explosion ratio lower limiting value, close exhaust gas stop valve when reaching 50%, opening accident is diffused Pneumatic cut-off valve realizes that safety interlocking control, the VOCs exhaust gas for avoiding explosion ratio lower limiting value larger are introduced in high temperature RTO heat In oxidation furnace.
Embodiment
Cokingization production VOCs exhaust gas thermal oxidation new processes in the present invention are gone into operation in August, 2017, are run so far just Often, system is stablized, and is 1.8 ten thousand m to VOCs exhaust gas maximum processing capabilities3/ h, actual treatment ability is 4000 to 6000m3/ h, VOCs waste gas purification high treating effects reach such as the discharge standard and index request in table 1.
Table 1《Coking chemistry emission of industrial pollutants standard》(GB16171-2012) emission limit (unit:mg/m3)
The above is presently preferred embodiments of the present invention, but the present invention should not be limited to disclosed in the embodiment Content.So every do not depart from the lower equivalent or modification completed of spirit disclosed in this invention, the model that the present invention protects is both fallen within It encloses.

Claims (8)

1. cokingization produces VOCs waste gas heat oxidation treatment devices, which is characterized in that include successively:Washing oil absorptive unit, FTA safety Interlocked control unit, thermal oxidation unit and separative element;Wherein,
Described FTA safety interlockings control unit one end is placed between the washing oil absorptive unit and the anti-explosion fire-retardant liquid packing, The other end is connected with the thermal oxidation unit inlet end;
The thermal oxidation unit includes anti-explosion fire-retardant liquid packing, mist eliminator, surge tank, several exhaust gas main air blowers successively With spark arrester and RTO thermal oxidation furnaces;The anti-explosion fire-retardant liquid packing, mist eliminator and surge tank are sequentially communicated, it is described several Exhaust gas main air blower is connected in parallel, and one end is respectively communicated with the surge tank outlet side, the other end and the spark arrester inlet end pair It should be connected to;RTO thermal oxidation furnaces one end is connect with the spark arrester outlet side, and the other end is connected to the separative element.
2. cokingization as described in claim 1 produces VOCs waste gas heat oxidation treatment devices, which is characterized in that the FTA safety Interlocked control unit diffuses pneumatic cut-off valve group by flammable gas explosion concentration limit detector, exhaust gas pneumatic cut-off valve and accident At.
3. cokingization as described in claim 1 produces VOCs waste gas heat oxidation treatment devices, which is characterized in that the hot oxygen of RTO It includes that can be used for the first regenerative chamber, the second regenerative chamber and third regenerative chamber of VOCs heating by the exhaust gases, decomposition and scavenging to change stove, and institute State the first regenerative chamber, the second regenerative chamber and third regenerative chamber can control VOCs waste gas flow directions by reversal valve.
4. cokingization as described in claim 1 produces VOCs waste gas heat oxidation treatment devices, which is characterized in that the new equipment is also The burner for including the purging motor being connected with the RTO thermal oxidation furnaces and being connected to RTO thermal oxidation furnaces upper end.
5. the cokingization for producing VOCs waste gas heat oxidation treatment devices by the cokingization as described in claim any one of 1-4 produces VOCs Exhaust gas thermal oxidation new process, which is characterized in that include the following steps:
(1) VOCs exhaust gas is pre-processed by the washing oil absorptive unit;
(2) in step (1) pretreated VOCs exhaust gas it is preheated, decompose and scavenging cycle thermal oxidation;
(3) the gas separation and post-processing after step (2) thermal oxidation.
6. cokingization as claimed in claim 5 produces VOCs exhaust gas thermal oxidation new processes, which is characterized in that the thermal oxide Processing procedure is:
VOCs exhaust gas is successively through the anti-explosion fire-retardant liquid packing, mist eliminator and surge tank under exhaust gas main air blower suction, into Enter the RTO thermal oxidation furnaces internal heating oxidation resolution process;Wherein, VOCs exhaust gas first switches into described first by the reversal valve Regenerative chamber is heated to be high-temp waste gas;Second regenerative chamber is entered back into, is that 800 DEG C of -850 DEG C of pyrolytics formation contain in temperature CO2And H2The high-temperature flue gas of O;The third regenerative chamber is entered back into, the sensible heat of above-mentioned high-temperature flue gas is stored in the third accumulation of heat It is discharged or enters through the reversal valve in the ceramic heat-storing body of room, after being cooled to 180-220 DEG C and recycle thermal oxidation next time.
7. as cokingization described in claim 5 or 6 produces VOCs exhaust gas thermal oxidation new processes, which is characterized in that pass through institute It states reversal valve and controls the cycling hot oxidation processes, specially:It preheats (the first regenerative chamber)-and decomposes (the second regenerative chamber)- Scavenging (third regenerative chamber)-scavenging (the first regenerative chamber)-preheating (the second regenerative chamber)-decomposes (third regenerative chamber)-and decomposes (first Regenerative chamber)-scavenging (the second regenerative chamber)-preheating (third regenerative chamber), it repeats several times.
8. cokingization as claimed in claim 7 produces VOCs exhaust gas thermal oxidation new processes, which is characterized in that the cycling hot Non-methane total hydrocarbons concentration after oxidation processes in cokingization production VOCs exhaust gas is no more than 5000mg/m3, VOCs waste gas burning efficiency Reach 99% or more, VOCs total amounts≤19.9mg/m3, non-methane hydrocarbon emission concentration < 50mg/m3, benzene concentration of emission < 6mg/ m3, discharged nitrous oxides concentration < 20mg/m3
CN201810488481.3A 2018-05-21 2018-05-21 Cokingization produces VOCs exhaust gas thermal oxidation new processes and processing unit Pending CN108654340A (en)

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CN113025359A (en) * 2021-03-16 2021-06-25 山东驰盛新能源设备有限公司 Coking chemical product waste gas treatment process monitoring system

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