CN209393027U - A kind of high concentration VOCs tail gas qualified discharge processing unit based on condensation catalysis oxidation - Google Patents

Abstract

The utility model provides a kind of high concentration VOCs tail gas qualified discharge processing unit based on condensation catalysis oxidation, belong to VOCs treatment technical field, and in particular to the high concentration VOCs tail gas recycle controlling device discharged in the techniques such as petrochemical industry, fine chemistry industry, medical manufacture, production of resins or reactor process.It includes that pipeline by connecting between condenser system and catalytic oxidation system and above system and valve are constituted, the device can evade evaporative condenser there are the problem of and risk, solve the problems, such as that independent condensation process organic exhaust gas is difficult to qualified discharge, it can be effectively relieved during group technology processing organic exhaust gas again, the high problem of operation energy consumption, device is energy-efficient, reliable, good economy performance, and treatment effeciency is up to 99.9% or more.

Description

A kind of high concentration VOCs tail gas qualified discharge processing unit based on condensation catalysis oxidation

Technical field

The utility model relates to VOCs treatment technical fields, and in particular to a kind of based on the highly concentrated of condensation catalysis oxidation VOCs tail gas qualified discharge processing unit is spent, the works such as petrochemical industry, fine chemistry industry, medical manufacture, production of resins are particularly suitable for The high concentration VOCs tail gas recycle discharged in skill or reactor process is administered.

Background technique

The tail gas discharged in the industries such as petrochemical industry, fine chemistry industry, medicine and production of resins, concentration height, complicated components are main To be volatile organic matter (Volatile Organic Compounds, abbreviation VOCs), it is most of toxic, harmful, have one Fixed carcinogenicity.Chinese Ministry of Environmental Protection in 2015 has issued " petro chemical industry pollutant emission standard (GB31571-2015) " and " stone Oil refining emission of industrial pollutants standard (GB31570-2015) ", has further clarified enterprise pollution object emission limit and index, Wherein: non-methane total hydrocarbons removal efficiency need to reach 97% or more, and benzene and aromatic compound etc. are included into characteristic contamination, be discharged into one Step is stringent, must reach the discharge of milligram grade.However, pollutant emission enterprise wishes for the high concentration tail gas of generation to be recycled Purified treatment is carried out, again afterwards to reach optimum utilization.

It is directed to the recovery processing of high concentration emission at present, it is main to combine heating power to aoxidize using condensation, UF membrane, absorption The combination of isolation or several techniques, first recycles after-purification.

Wherein, absorption method is a kind of traditional processing technique, but if directly carrying out absorbing and recovering high-concentration tail gas, absorption Burden is big, is easy to cause hot-spot, especially processing organic steam containing low boiling point, such as acetone, carbon disulfide and n-hexane Tail gas, there are kindling hidden danger, in addition, generating a large amount of dangerous wastes after adsorption column frequent switching parsing regeneration and regeneration lifetime, limiting Its being used alone in the processing of high concentration tail gas recycle is made.

Membrane separation process is a kind of new efficient separation method, it compared with traditional absorption method and condensation method, have efficiently, Advantage easy to operate.The running expense of membrane separation process is little with concentration relationship, is suitable for handling high concentration VOCs tail gas.But it should The shortcomings that method is that membrane lifetime is short, and initial input cost and maintenance cost are high, can also be enriched with and retain in replaced membrane module VOCs can generate secondary pollution.

Condensation method is that have the principle of different saturated vapour pressures come real at different temperatures and pressures using various VOCs Now separate and recover.Traditional condensation method recycles to obtain the low temperature environment that VOCs recycling needs using sweat cooling, but in reality In, it is primarily present leakage of refrigerant, generates fluoride pollution, or even causes compressor damage and then is generated to subsequent technique It seriously affects, on the other hand, in order to reach required lower cryogenic temperature, generally requires using multi-stage compression or cascade refrigeration system The problems such as system, leads to complex process, and component is more, and volume is big, at high cost.

Based on the above issues, it excludes outside the secondary pollution risk of leakage of refrigerant, condensation method is last with catalytic oxidation etc. The combination of destruction technology is held, the requirement lower than explosion limit had not only been able to satisfy, but also is able to achieve the discharge of high concentration VOCs tail gas milligram grade most For the ideal choice of technology.However, catalysis oxidation decomposition technique application in, due to being influenced by gas source concentration, often according to It is diluted by benefit wind to reduce oxidation reaction room temperature to ensure that system stablizes safe operation, not only frequent switching starting is electric in this way adds Hot device and add mend wind blower, also increase operation power consumption.

In conclusion solving sweat cooling system in the presence of structure is complicated, transport or operational process have leakage of refrigerant and lead It causes refrigeration system failure or cryogenic temperature that setting value is not achieved and aoxidizes bring security risk and multi-stage refrigerating to back-end catalytic Or energy consumption is high and the problems such as catalysis oxidation Optimization of Energy Saving for cascade refrigeration, just can guarantee stable safety, the operation of low energy consumption and stringent Discharge index.

Summary of the invention

The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of based on the highly concentrated of condensation catalysis oxidation Spend VOCs tail gas qualified discharge processing unit, evade evaporative condenser there are the problem of and risk, it is organic to solve independent condensation process Exhaust gas is difficult to the problem of qualified discharge, and can be effectively relieved during group technology processing organic exhaust gas, and operation energy consumption is high to ask Topic, establishes a set of energy-efficient, reliable, good economy performance technique and device, achievees the effect that real energy-saving and emission-reduction.

To achieve the above objectives, the present invention adopts the following technical solutions:

It is a kind of based on condensation catalysis oxidation high concentration VOCs tail gas qualified discharge processing unit, comprising: condenser system and The pipeline and valve connected between catalytic oxidation system and above system；The condenser system include gas inlet, fire arrester, Cooling capacity exchanging device, ice chest, expanding machine, source nitrogen, lime set recycling can, Liquid guiding pump, high pressure air pump, the catalytic oxidation system include Preheater, electric heater, catalytic reactor；The expander inlet is connect with source nitrogen, and expander outlet is connect with G mouthfuls of ice chest Through H mouthfuls of return source nitrogens of ice chest, the lime set recycling can liquid return hole is connect with ice chest, before lime set recycling can pneumostome and fire arrester The gas inlet at end connects, and lime set recycling can leakage fluid dram is connect with Liquid guiding pump；The gas inlet is received to be generated from pollution sources High concentration VOCs, connect after fire arrester with A mouthfuls of Cooling capacity exchanging device, by C mouthfuls of Cooling capacity exchanging device come out enter ice chest E mouthfuls, It is connect after F mouthfuls of ice chest come out with high-pressure blast pump intake, high-pressure blast pump discharge is connect with B mouthfuls of Cooling capacity exchanging device, through Cooling capacity exchanging D mouthfuls of device connect with preheater shell side inlet afterwards out, and preheater shell-side outlet is successively connect with electric heater, catalytic reactor, Catalytic reactor outlet is connect with preheater tube-side inlet, carries out heat friendship with the low temperature fixed gas from shell side in preheater Qualified discharge is exported by preheater tube side after changing；

Preferably, source nitrogen is not less than 0.4MPa from plant area's Nitrogen pipe network or mechanical nitrogen making machine, pressure, and temperature is not higher than 40 degree, purity is not less than 99%；

Preferably, pipeline is equipped with bypass between Cooling capacity exchanging device D mouthfuls and preheater shell side inlet and corresponding flow is adjusted Valve；

Compared with prior art, the utility model has the advantage, that

1. can avoid traditional evaporative condenser leakage of refrigerant pollution using nitrogen expansion refrigeration or because of system of freezing caused by it The system failure caused by failure bring refrigerating capacity of uniting is inadequate, while multi-stage condensing or cascade refrigeration are compared, structure is simple, reaches The installed power needed to identical cryogenic temperature is low, and investment operating cost is lower；

2. employing nitrogen as refrigerant, supplied using Nitrogen pipe network in factory, enterprise or using machinery nitrogen, cost Low, environmental protection easily obtains；

3. device has been abandoned all there may be the processing method of secondary pollution, coupling and catalyzing oxidation technology can reach Recovering effect, and it is able to satisfy increasingly strict discharge standard；

4. the fixed gas VOCs of safe concentration, which is introduced catalytic reactor by bypass flow regulator, carries out oxygenolysis, It can not only substitute and mend wind cooling bring cost of investment and operation power consumption, under conditions of being able to maintain that stable oxidation calorific value, Also save electric heater acting energy consumption.

Detailed description of the invention

Fig. 1 is the apparatus structure schematic diagram of the utility model.

Specific embodiment

The utility model is further described presently in connection with attached drawing.Attached drawing be simplified schematic diagram only in a schematic way Illustrate the basic structure of the utility model, therefore it only shows composition related with the utility model.

As shown in Figure 1, a kind of high concentration VOCs tail gas qualified discharge processing unit based on condensation catalysis oxidation, including it is cold The pipeline and valve connected between solidifying system and catalytic oxidation system and above system；The condenser system includes gas inlet 1, fire arrester 2, Cooling capacity exchanging device 3, ice chest 4, expanding machine 5, source nitrogen 6, lime set recycling can 7, Liquid guiding pump 8, high pressure air pump 9, institute Stating catalytic oxidation system includes preheater 10, electric heater 11, catalytic reactor 12；5 entrance of expanding machine and source nitrogen 6 connect It connects, the outlet of expanding machine 5 is connect with 4G mouthfuls of ice chest through 4H mouthfuls of return source nitrogens 6 of ice chest, 7 liquid return hole of lime set recycling can and ice chest 4 connections, 7 pneumostome of lime set recycling can are connect with the gas inlet 1 of 2 front end of fire arrester, 7 leakage fluid dram of lime set recycling can and Liquid guiding pump 8 connections；3D mouthfuls of Cooling capacity exchanging device between 10 shell side inlet of preheater pipeline be equipped with bypass 13 and corresponding flow control valve 14, Bypass 13 is connect with 12 entrance of catalytic reactor；

Gas inlet 1 receives the high concentration VOCs that generates from pollution sources, after fire arrester 2 with 3A mouthfuls of companies of Cooling capacity exchanging device Connect, by 3C mouthfuls of Cooling capacity exchanging device come out enter ice chest 4E mouthful, pressure not less than 0.4MPa, temperature be not higher than 40 degree, purity not Enter lower than expanded 5 entrance of machine of 99% source nitrogen, after nitrogen is inflated cooling in expanding machine 5, by expanding machine 5 export into Enter 4G mouthfuls of ice chest be attached thereto, complete Cooling capacity exchanging with VOCs tail gas in ice chest 4, the temperature rise nitrogen after Cooling capacity exchanging returns Source nitrogen 6, liquefied VOCs flows into lime set recycling can 7 by ice chest 4, when the liquid VOCs in lime set recycling can 7 reaches a constant volume When amount, product storage tank is squeezed by Liquid guiding pump 8 by 7 leakage fluid dram of lime set recycling can, wherein secondary volatilization in lime set recycling can 7 VOCs steam is returned to 1 pipeline of the gas inlet circulating condensing again of 2 front end of fire arrester, fixed gas by 7 pneumostome of lime set recycling can It being connect after 4F mouthfuls of ice chest come out with 9 entrance of high pressure air pump, the outlet of high pressure air pump 9 is connect with 3B mouthfuls of Cooling capacity exchanging device, at this point, In Cooling capacity exchanging device 3, after the lower fixed gas of temperature carries out Cooling capacity exchanging with the VOCs from gas inlet 1, enter from tail gas The VOCs temperature of mouth 1 enters ice chest 4 after being lowered, so recycle, reduce 4 load of ice chest；The fixed gas that temperature is elevated, warp 3D mouthfuls of Cooling capacity exchanging device come out and sequentially enter that 10 shell side of preheater, that electric heater 11 and catalytic reactor 12 carry out catalysis oxidation is anti- Answer, the high temperature clean gas after oxygenolysis, by catalytic reactor 12 outlet enter 10 tube side of preheater, in preheater 10 with Qualified discharge is exported by 10 tube side of preheater after fixed gas progress heat exchange from shell side；By the fixed gas of heat exchange temperature rise into Enter electric heater 11 and catalytic reactor 12, so recycles, reduce the load of electric heater 11；When 12 medium temperature of catalytic reactor When degree is more than setting value lower limit, for safeguards system safe and stable operation, the fixed gas come out from 3D mouthfuls of ice chest is by 13 warp of bypass After flow control valve 14 adjusts suitable aperture, the fixed gas of one flow without preheater 10 and electric heater 11, directly into Enter catalytic reactor 12 and participate in oxidative decomposition, gives giving catalytic reactor 12 equilibrium temperature, the fixed gas of another plume amount Catalytic reactor 12 is still entered by preheater 10 and electric heater 11 and participates in oxidation reaction.

The preferable specific embodiment of the above, only the utility model, but the protection scope of the utility model is not It is confined to this, anyone skilled in the art is practical according to this in the technical scope that the utility model discloses Novel technical solution and its design is subject to equivalent substitution or change, should be covered within the scope of the utility model.

Claims (3)

1. a kind of high concentration VOCs tail gas qualified discharge processing unit based on condensation catalysis oxidation, comprising: condenser system and urge Change the pipeline and valve connected between oxidative system and above system；The condenser system includes gas inlet, fire arrester, cold Exchanger, ice chest, expanding machine, source nitrogen, lime set recycling can, Liquid guiding pump, high pressure air pump are measured, the catalytic oxidation system includes pre- Hot device, electric heater, catalytic reactor；The expander inlet is connect with source nitrogen, and expander outlet connect warp with G mouthfuls of ice chest H mouthfuls of return source nitrogens of ice chest, the lime set recycling can liquid return hole are connect with ice chest, lime set recycling can pneumostome and fire arrester front end Gas inlet connection, lime set recycling can leakage fluid dram connect with Liquid guiding pump；What the gas inlet reception was generated from pollution sources High concentration VOCs is connect after fire arrester with A mouthfuls of Cooling capacity exchanging device, is come out by C mouthfuls of Cooling capacity exchanging device and is entered ice chest E mouthfuls, warp F mouthfuls of ice chest connect with high-pressure blast pump intake afterwards out, and high-pressure blast pump discharge is connect with B mouthfuls of Cooling capacity exchanging device, through Cooling capacity exchanging device D Mouth is connect after coming out with preheater shell side inlet, and preheater shell-side outlet is successively connect with electric heater, catalytic reactor, catalysis Reactor outlet is connect with preheater tube-side inlet, after exchanging in preheater with the low temperature fixed gas progress heat from shell side Qualified discharge is exported by preheater tube side.

2. a kind of high concentration VOCs tail gas qualified discharge based on condensation catalysis oxidation according to claim 1 handles dress It sets, it is characterised in that: the source nitrogen is not less than 0.4MPa, temperature from plant area's Nitrogen pipe network or mechanical nitrogen making machine, pressure Not higher than 40 degree, purity is not less than 99%.

3. a kind of high concentration VOCs tail gas qualified discharge based on condensation catalysis oxidation according to claim 1 handles dress It sets, it is characterised in that: the pipeline between preheater shell side inlet of described D mouthfuls of Cooling capacity exchanging device is equipped with bypass and corresponding flow Regulating valve.