CN110841431A - VOCs waste gas treatment system and treatment method - Google Patents

VOCs waste gas treatment system and treatment method Download PDF

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Publication number
CN110841431A
CN110841431A CN201911307601.6A CN201911307601A CN110841431A CN 110841431 A CN110841431 A CN 110841431A CN 201911307601 A CN201911307601 A CN 201911307601A CN 110841431 A CN110841431 A CN 110841431A
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gas
unit
liquid
spraying
treatment
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胡静龄
钟璐
杨颖欣
刘勇
胡小吐
杨森林
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Guangdong Jiade Environmental Protection Technology Co Ltd
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Guangdong Jiade Environmental Protection Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/14—Separation 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 by absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/14—Separation 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 by absorption
    • B01D53/1487—Removing organic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/76—Gas phase processes, e.g. by using aerosols
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/04—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste liquors, e.g. sulfite liquors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/10—Oxidants
    • B01D2251/104—Ozone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/708—Volatile organic compounds V.O.C.'s
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2209/00—Specific waste
    • F23G2209/10—Liquid waste
    • F23G2209/101—Waste liquor

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Dispersion Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention relates to a VOCs waste gas treatment system and a treatment method, wherein the treatment system comprises a first heat exchange device, a spraying unit, a second heat exchange device, an evaporation unit, a combustion unit and a tail gas treatment unit; a first heat exchange device is arranged on an air inlet pipeline through which the VOCs waste gas flows into the spraying unit; a liquid outlet of the spraying unit is connected with a feed inlet of the evaporation unit, and a second heat exchange device is arranged on a connecting pipeline of the spraying unit and the evaporation unit; the gas outlet of the evaporation unit is connected with the spraying unit, and the liquid outlet of the evaporation unit is connected with the combustion unit; a combustion gas outlet of the combustion unit is connected with a heat source inlet of the second heat exchange device; and a heat source outlet of the second heat exchange device is connected with a gas outlet of the spraying unit and then connected with the tail gas treatment unit. When the VOCs waste gas treatment system provided by the invention is used for treating VOCs waste gas, the heat source consumption can be reduced, and the treatment effect of the VOCs waste gas is good.

Description

VOCs waste gas treatment system and treatment method
Technical Field
The invention belongs to the technical field of waste gas treatment, relates to a waste gas treatment system and a treatment method, and particularly relates to a VOCs waste gas treatment system and a treatment method.
Background
Volatile Organic Compounds (VOCs) generally refer to volatile organic chemicals having high evaporation pressure at normal temperature and pressure, and mainly include aliphatic and aromatic alkanes, alkenes, oxygenated hydrocarbons, and halogenated hydrocarbons, such as benzene, toluene, dichloromethane, formaldehyde, ethyl acetate, and the like.
VOCs generally have stronger irritation and toxicity, part of VOCs have teratogenesis, carcinogenesis and mutagenesis, and the other part of VOCs have the characteristics of flammability, explosiveness and the like; some VOCs are factors that cause photochemical smog; halogenated hydrocarbon VOCs can destroy the ozone layer and cause greenhouse effect; VOCs are also important precursors of ozone and PM2.5, and haze weather is closely related to the environmental mass concentration of ozone and PM 2.5. Therefore, the research on the generation of the VOCs and the reduction of the emission of the VOCs has important significance for human body and biological health, ecological environment and the emission reduction of ozone, PM2.5 and haze.
The coking process in the steel production process produces VOCs, and the sintering process is also one of the sources of VOCs. For example, VOCs are formed by volatile substances in raw fuel such as coke, oily iron oxide scale and the like in the sintering process and are discharged in a gas form, the temperature of fuel particles is increased along with the sintering process, internal organic volatile substances are emitted into a gas flow in a gas state, and the temperature is reduced along with the downward operation of the gas flow. Therefore, dust formed by temperature reduction and condensation exists in the VOCs waste gas.
CN 207254047U discloses a VOCs recovery unit based on second grade absorption, three steps of condensation integrated process, the device comprises draught fan, absorption tower in advance, main absorption tower, absorption pump, recycle pump, condensing unit, heat exchanger in advance, one-level heat exchanger, second grade heat exchanger, level gauge, ball valve, pressure sensor, temperature sensor and pipe fitting. Wherein the pre-absorber absorbs a small amount of VOCs and the main absorber plays a major role. However, the above device only absorbs harmful substances in the VOCs, and does not completely treat the VOCs, so that the treatment cost is high.
CN 204816181U discloses a VOC processing system, including the VOC intake pipe, the VOC intake pipe meets with biological contact oxidation tower bottom air inlet, and biological contact oxidation tower top gas vent is connected with sodium hypochlorite catalytic oxidation tower bottom air inlet through the exhaust pipe, and sodium hypochlorite catalytic oxidation tower top gas vent is connected with the tail gas delivery pipe, is equipped with the air exhauster in the VOC intake pipe. The treatment system uses a biochemical treatment method to treat VOC, has low treatment efficiency and large occupied space of equipment, and needs to treat activated sludge, so that the treatment cost is high.
CN 108031277A discloses a VOC-containing waste gas catalytic oxidation purification treatment method, through a VOC-containing waste gas catalytic purification treatment method, VOC-containing waste gas enters a heat exchanger after passing through a fan, heated VOC-containing waste gas enters a catalytic oxidation reactor, a low-temperature catalytic oxidation reactor is arranged in parallel with the catalytic oxidation reactor, and outlet material flows of the catalytic oxidation reactor and the low-temperature catalytic oxidation reactor are cooled by the heat exchanger and then discharged after reaching standards. The treatment method uses a catalytic combustion process to treat the VOC waste gas, has higher requirements on the composition of the catalyst, and has inevitable catalyst loss in the use process, and the cost for treating the VOC waste gas is higher.
CN 108006669 a discloses a VOC gas treatment system and method, the system comprising: VOC gas conveying pipeline, an annular air duct of a coke quenching furnace of a coke dry quenching device and a primary dust remover of the coke dry quenching device. One end of the VOC gas conveying device is connected with the annular air duct, the other end of the VOC gas conveying device is connected with the VOC gas discharge port of each coking section, and the primary dust remover is connected with the outlet of the annular air duct. The method comprises the following steps: and (3) delivering the VOC gas of each coking section into an annular air duct of a coke quenching furnace of a coke quenching device, and delivering the VOC gas into a primary dust remover of the coke dry quenching device through the annular air duct for combustion treatment. The system has the advantages that the method for treating and utilizing the VOC is simple, the utilization rate of VOC waste gas is low, and toxic and harmful substances generated after the VOC is dry-quenched cannot be effectively eliminated.
Therefore, the system and the method for treating the VOC waste gas have low equipment investment cost and high VOC waste gas utilization rate, and have important significance for reducing the VOC treatment cost in the steel industry and improving the economic benefit of enterprises.
Disclosure of Invention
The invention aims to provide a VOCs waste gas treatment system and a treatment method, wherein the VOCs waste gas treatment system can effectively utilize the heat of VOCs waste gas, reduce the pollution of the VOCs waste gas to the environment by burning the VOCs waste gas, and consume less energy; when the VOCs waste gas treatment system who utilizes to provide handles VOCs waste gas, the cost of handling is lower, and the treatment effect is better.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a system for treating VOCs waste gas, which comprises a first heat exchange device, a spraying unit, a second heat exchange device, an evaporation unit, a combustion unit and a tail gas treatment unit.
And a first heat exchange device is arranged on the air inlet pipeline of the VOCs waste gas flowing into the spraying unit.
A liquid outlet of the spraying unit is connected with a feed inlet of the evaporation unit, and a second heat exchange device is arranged on a connecting pipeline of the spraying unit and the evaporation unit; the gas outlet of the evaporation unit is connected with the spraying unit, and the liquid outlet of the evaporation unit is connected with the combustion unit; a combustion gas outlet of the combustion unit is connected with a heat source inlet of the second heat exchange device; and a heat source outlet of the second heat exchange device is connected with a gas outlet of the spraying unit and then connected with the tail gas treatment unit.
The VOCs waste gas exchanges heat in a first heat exchange device to reduce the temperature; the cooled VOCs waste gas flows into the spraying unit, mass and heat transfer is carried out in the spraying unit, and the sprayed liquid is subjected to evaporation concentration after heat exchange and temperature rise through the second heat exchange device; the concentrated liquid is used for providing heat for the second heat exchange device after being combusted in the combustion unit, and gas generated by evaporation and concentration is condensed and then is used as spraying liquid in the spraying unit; and the combustion gas generated by the combustion unit and the spraying gas generated by the spraying unit are mixed and then flow into the tail gas treatment unit for tail gas treatment.
The VOCs waste gas comprises VOCs waste gas generated in a coking process and/or VOCs waste gas generated in a sintering process.
Preferably, the first heat exchange device and the second heat exchange device respectively and independently comprise a shell-and-tube heat exchanger and/or a plate heat exchanger.
The first heat exchange device is used for heat exchange and cooling of VOCs waste gas and the outside, so that heat of the VOCs waste gas generated by coking and/or the VOCs waste gas generated by sintering is effectively utilized. And VOCs waste gas is cooled in first heat transfer device, has reduced the volatilization of the interior spray solution of spraying unit and the use amount of spray solution, has reduced the liquid medicine cost.
The second heat exchange device is used for heat exchange and temperature rise of the absorption liquid and the outside, so that the heat consumption of the combustion unit is reduced, and energy is saved. And the heat source of the second heat exchange device is combustion steam generated by combustion of the concentrated solution, so that an additional external heat source is not needed, the energy is further saved, and the cost is reduced.
And the temperature of the cooled combustion gas is further reduced after being mixed with the spray gas, so that excessive decomposition of ozone can be avoided during ozone mixing, and the consumption of ozone is reduced.
Preferably, the spraying unit comprises a spraying tower, a spraying liquid storage tank and a condenser.
The feed inlet of condenser is connected with evaporation unit's liquid outlet, and the liquid outlet of condenser is connected with the spray liquid exit tube. The spraying liquid storage tank is used for providing spraying liquid for the spraying tower.
Preferably, the evaporation unit is any one of a three-effect evaporator, a four-effect evaporator or a five-effect evaporator, and is preferably a three-effect evaporator.
Preferably, the triple-effect evaporator, the quadruple-effect evaporator or the quintuple-effect evaporator is independently a cocurrent flow evaporator, a countercurrent flow evaporator or an advection flow evaporator, preferably a countercurrent flow evaporator.
The evaporation unit is used for evaporating and concentrating the absorption liquid flowing in from the spraying unit, the cost and the evaporation and concentration effect are considered, and the evaporation unit is a triple-effect counter-flow evaporator. The invention selects the evaporation unit as the triple-effect counter-flow evaporator, which not only can reduce the investment cost of equipment, but also can reduce the consumption of external heat sources.
Preferably, the combustion unit comprises a combustion furnace and/or an incinerator.
Preferably, the tail gas treatment system comprises an ozone generator, a static mixer and a desulfurization and denitrification tower.
And the air inlet of the static mixer is used for connecting a heat source outlet of the second heat exchange device, an air outlet of the spraying unit and an ozone outlet of the ozone generator, and the air outlet of the static mixer is connected with the air inlet.
The spraying gas flowing out of the spraying unit, the evaporating gas flowing out of the concentrating unit and the ozone generated by the ozone generator are mixed in the static mixer, and the mixed gas flows into the desulfurization and denitrification tower for desulfurization and denitrification.
The desulfurization and denitrification method is a method for desulfurization and denitrification by using ozone commonly used in the field, and includes but is not limited to the desulfurization and denitrification methods disclosed in CN 110052139 a or CN 110433622A.
In a second aspect, the present invention provides a method for treating waste gas containing VOCs by using the system for treating waste gas containing VOCs according to the first aspect, the method comprising the steps of:
(1) carrying out spray absorption treatment on the VOCs waste gas subjected to temperature reduction and heat exchange to obtain spray gas and absorption liquid;
(2) carrying out evaporation concentration on the absorption liquid after heat exchange and temperature rise to obtain evaporation gas and concentrated liquid;
(3) burning the concentrated solution, exchanging heat between the combustion gas and the absorption liquid obtained in the step (2) for cooling, mixing the combustion gas with the spray gas obtained in the step (1), and carrying out tail gas treatment; and (3) condensing the evaporated gas to be used as spraying liquid for the spraying absorption treatment in the step (1).
Preferably, the temperature of the waste gas of the VOCs after the temperature-reducing heat exchange in the step (1) is 80-120 ℃, for example, 80 ℃, 85 ℃, 90 ℃, 95 ℃, 100 ℃, 105 ℃, 110 ℃, 115 ℃ or 120 ℃, but not limited to the enumerated values, and other values in the numerical range are also applicable, preferably 90-110 ℃.
Preferably, the spraying liquid of the spraying absorption treatment in the step (1) is ammonia water with a mass fraction of 16-24%, for example, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23% or 24%, but not limited to the enumerated values, and other unrecited values in the numerical range are also applicable.
According to the invention, the ammonia water is adopted to spray and absorb the VOCs, so that not only can the particulate matters in the VOCs be removed, but also aromatic hydrocarbons, ketones, aldehydes, amines, halogenated hydrocarbons, unsaturated hydrocarbons and other substances in the VOCs can be absorbed through cooling. The spraying gas contains ammonia gas generated by ammonia water volatilization, and the addition of the ammonia gas is beneficial to the conversion of nitrogen oxide into N under the condition of ozone2And discharging.
Preferably, in the spray absorption treatment in the step (1), the liquid-gas ratio of the spray liquid to the VOCs waste gas is 0.5-5L/Nm3For example, it may be 0.5L/Nm3、1L/Nm3、2L/Nm3、3L/Nm3、4L/Nm3Or 5L/Nm3But are not limited to the recited values, and other values within the numerical range not recited are equally applicable.
Preferably, the evaporation concentration in the step (2) is any one of triple effect evaporation concentration, quadruple effect evaporation concentration or quintuple effect evaporation concentration.
Preferably, the evaporative concentration includes any one of cocurrent evaporative concentration, countercurrent evaporative concentration, or advection evaporative concentration. Further preferably, the evaporative concentration is a triple effect counter current evaporative concentration.
Preferably, after the evaporation concentration in step (2), the volume ratio of the concentrated solution to the absorption solution is (1-2):10, for example, 1:10, 1.1:10, 1.2:10, 1.3:10, 1.4:10, 1.5:10, 1.6:10, 1.7:10, 1.8:10, 1.9:10 or 2:10, but not limited to the enumerated values, and other unrecited values within the numerical range are equally applicable.
Preferably, the tail gas treatment in the step (3) is to perform desulfurization and denitrification treatment after mixing the combustion gas, the spray gas and the ozone.
The desulfurization and denitrification treatment method comprises but is not limited to the desulfurization and denitrification method disclosed in CN 110052139A or CN 110433622A.
As a preferable embodiment of the processing method according to the second aspect of the present invention, the processing method includes the steps of:
(1) carrying out spray absorption treatment on the VOCs waste gas at 60-90 ℃ after temperature reduction and heat exchange, wherein the spray liquid is ammonia water with the mass fraction of 16-24%, and the liquid-gas ratio of the spray liquid to the VOCs waste gas is 0.5-5L/Nm3Obtaining spraying gas and absorption liquid;
(2) carrying out evaporation concentration on the absorption liquid after heat exchange and temperature rise to obtain evaporation gas and concentrated liquid;
(3) burning the concentrated solution, exchanging heat between the combustion gas and the absorption liquid obtained in the step (2) for cooling, mixing the combustion gas with the spray gas obtained in the step (1), and carrying out tail gas treatment; the tail gas treatment is that the combustion gas, the spraying gas and the ozone are mixed and then subjected to desulfurization and denitrification treatment; and (3) condensing the evaporated gas to be used as spraying liquid for the spraying absorption treatment in the step (1).
Compared with the prior art, the invention has the following beneficial effects:
(1) the VOCs waste gas treatment system provided by the invention reduces the volatilization of the spraying liquid in the spraying unit and the usage amount of the spraying liquid through the arrangement of the first heat exchange device, and reduces the cost of the liquid medicine;
(2) the VOCs waste gas treatment system provided by the invention does not need an additional external heat source through the arrangement of the second heat exchange device, so that the energy is further saved, and the cost is reduced; the temperature of the cooled combustion gas is further reduced after being mixed with the spray gas, and excessive decomposition of ozone can be avoided during ozone mixing, so that the ozone consumption is reduced;
(3) the VOCs waste gas treatment system provided by the invention can effectively treat VOCs waste gas, so that harmful substances in the VOCs waste gas are concentrated and then combusted, the combustion difficulty is reduced, and the treatment effect of the VOCs waste gas is improved.
Drawings
Fig. 1 is a schematic structural diagram of a VOCs exhaust gas treatment system provided in embodiment 1.
Wherein: 1, a first heat exchange device; 2, a spray tower; 3, storing a spraying liquid; 4, a second heat exchange device; 5, an evaporation unit; 6, a condenser; 7, a combustion unit; 8, a desulfurization and denitrification tower; and 9, a static mixer.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a VOCs exhaust-gas treatment system, the schematic structural diagram of the VOCs exhaust-gas treatment system is shown in FIG. 1, and the VOCs exhaust-gas treatment system comprises: the device comprises a first heat exchange device 1, a spraying unit, a second heat exchange device 4, an evaporation unit 5, a combustion unit 7 and a tail gas treatment unit.
A first heat exchange device 1 is arranged on an air inlet pipeline of the VOCs waste gas flowing into the spraying unit; a liquid outlet of the spraying unit is connected with a feed inlet of the evaporation unit 5, and a second heat exchange device 4 is arranged on a connecting pipeline of the spraying unit and the evaporation unit 5; the gas outlet of the evaporation unit 5 is connected with the spraying unit, and the liquid outlet of the evaporation unit 5 is connected with the combustion unit 7; a combustion gas outlet of the combustion unit 7 is connected with a heat source inlet of the second heat exchange device 4; and a heat source outlet of the second heat exchange device 4 is connected with a gas outlet of the spraying unit and then connected with the tail gas treatment unit.
The first heat exchange device 1 and the second heat exchange device 4 are respectively and independently shell-and-tube heat exchangers.
The spraying unit comprises a spraying tower 2, a spraying liquid storage tank 3 and a condenser 6; a feed inlet of the condenser 6 is connected with a liquid outlet of the evaporation unit 5, and a liquid outlet of the condenser 6 is connected with a spray liquid outlet pipe; the spraying liquid storage tank 3 is used for providing spraying liquid for the spraying tower 2.
The evaporation unit 5 is a triple-effect counter-flow evaporator. The combustion unit 7 is an incinerator.
The tail gas treatment system comprises an ozone generator, a static mixer 9 and a desulfurization and denitrification tower 8; and the air inlet of the static mixer 9 is used for connecting the heat source outlet of the second heat exchange device 4, the air outlet of the spraying unit and the ozone outlet of the ozone generator, and the air outlet of the static mixer 9 is connected with the air inlet.
When the VOCs waste gas treatment system is used for treating VOCs waste gas, the VOCs waste gas exchanges heat in the first heat exchange device 1 to reduce the temperature; the cooled VOCs waste gas flows into the spraying unit, mass and heat transfer is carried out in the spraying unit, and the sprayed liquid is subjected to heat exchange and temperature rise through the second heat exchange device 4 and then subjected to triple-effect countercurrent evaporation concentration; the concentrated liquid is combusted in the incinerator and then used for providing heat for the second heat exchange device 4; gas generated by evaporation concentration flows into the spraying liquid storage tank 3 after being condensed in the condenser 6 and is used as spraying liquid in the spraying unit; the combustion gas generated by the incinerator and the spray gas generated by the spray unit are mixed and then flow into the static mixer 9, and are mixed with ozone in the static mixer 9, and the mixed gas flows into the desulfurization and denitrification tower 8 for desulfurization and denitrification treatment.
Application example 1
The application example provides a treatment method for treating VOCs waste gas by using the VOCs waste gas treatment system provided in embodiment 1, and the treatment method includes the following steps:
(1) the VOCs waste gas is cooled to 75 ℃ after flowing through the first heat exchange device 1, then flows into the spray tower 2 for spray absorption treatment, the spray liquid is ammonia water with the mass fraction of 20%, and the liquid-gas ratio of the spray liquid to the VOCs waste gas is 3L/Nm3Obtaining spraying gas and absorption liquid;
(2) carrying out heat exchange and temperature rise on the absorption liquid in a second heat exchange device 4, and then carrying out triple-effect countercurrent evaporation and concentration to obtain evaporation gas and concentrated liquid, wherein the volume ratio of the concentrated liquid to the absorption liquid is 1.5: 10;
(3) burning the concentrated solution in an incinerator, exchanging heat between the combustion gas and the absorption liquid obtained in the step (2) in a second heat exchange device 4, cooling, mixing with the spray gas obtained in the step (1), and performing tail gas treatment; the tail gas treatment is that the combustion gas, the spraying gas and the ozone generated by the ozone generator are mixed in the static mixer 9 and then are subjected to desulfurization and denitrification treatment; and (3) condensing the evaporated gas, flowing into a spraying liquid storage tank 3, and using the condensed gas as spraying liquid for the spraying absorption treatment in the step (1).
The desulfurization and denitrification method is the desulfurization and denitrification method disclosed in CN 110052139A, and the content of nitrogen oxides in the outer exhaust gas after desulfurization and denitrification is less than or equal to 30mg/Nm3The content of oxysulfide is less than or equal to 30mg/Nm3。
Application example 2
The application example provides a treatment method for treating VOCs waste gas by using the VOCs waste gas treatment system provided in embodiment 1, and the treatment method includes the following steps:
(1) the VOCs waste gas is cooled to 70 ℃ after flowing through the first heat exchange device 1, then flows into the spray tower 2 for spray absorption treatment, the spray liquid is ammonia water with mass fraction of 22%, and the liquid-gas ratio of the spray liquid to the VOCs waste gas is 1.5L/Nm3Obtaining spraying gas and absorption liquid;
(2) carrying out heat exchange and temperature rise on the absorption liquid in a second heat exchange device 4, and then carrying out triple-effect countercurrent evaporation and concentration to obtain evaporation gas and concentrated liquid, wherein the volume ratio of the concentrated liquid to the absorption liquid is 1.8: 10;
(3) burning the concentrated solution in an incinerator, exchanging heat between the combustion gas and the absorption liquid obtained in the step (2) in a second heat exchange device 4, cooling, mixing with the spray gas obtained in the step (1), and performing tail gas treatment; the tail gas treatment is that the combustion gas, the spraying gas and the ozone generated by the ozone generator are mixed in the static mixer 9 and then are subjected to desulfurization and denitrification treatment; and (3) condensing the evaporated gas, flowing into a spraying liquid storage tank 3, and using the condensed gas as spraying liquid for the spraying absorption treatment in the step (1).
The desulfurization and denitrification method is the desulfurization and denitrification method disclosed in CN 110052139A, and the content of nitrogen oxides in the outer exhaust gas after desulfurization and denitrification is less than or equal to 30mg/Nm3The content of oxysulfide is less than or equal to 30mg/Nm3。
Application example 3
The application example provides a treatment method for treating VOCs waste gas by using the VOCs waste gas treatment system provided in embodiment 1, and the treatment method includes the following steps:
(1) the VOCs waste gas is cooled to 80 ℃ after flowing through the first heat exchange device 1, then flows into the spray tower 2 for spray absorption treatment, the spray liquid is ammonia water with mass fraction of 18%, and the liquid-gas ratio of the spray liquid to the VOCs waste gas is 4L/Nm3Obtaining spraying gas and absorption liquid;
(2) carrying out heat exchange and temperature rise on the absorption liquid in a second heat exchange device 4, and then carrying out triple-effect countercurrent evaporation and concentration to obtain evaporation gas and concentrated liquid, wherein the volume ratio of the concentrated liquid to the absorption liquid is 1.2: 10;
(3) burning the concentrated solution in an incinerator, exchanging heat between the combustion gas and the absorption liquid obtained in the step (2) in a second heat exchange device 4, cooling, mixing with the spray gas obtained in the step (1), and performing tail gas treatment; the tail gas treatment is that the combustion gas, the spraying gas and the ozone generated by the ozone generator are mixed in the static mixer 9 and then are subjected to desulfurization and denitrification treatment; and (3) condensing the evaporated gas, flowing into a spraying liquid storage tank 3, and using the condensed gas as spraying liquid for the spraying absorption treatment in the step (1).
The desulfurization and denitrification method is the desulfurization and denitrification method disclosed in CN 110052139A, and the content of nitrogen oxides in the outer exhaust gas after desulfurization and denitrification is less than or equal to 30mg/Nm3The content of oxysulfide is less than or equal to 30mg/Nm3。
Application example 4
The application example provides a treatment method for treating VOCs waste gas by using the VOCs waste gas treatment system provided in embodiment 1, and the treatment method includes the following steps:
(1) the VOCs waste gas is cooled to 60 ℃ after flowing through the first heat exchange device 1, then flows into the spray tower 2 for spray absorption treatment, the spray liquid is ammonia water with the mass fraction of 24%, and the liquid-gas ratio of the spray liquid to the VOCs waste gas is 0.5L/Nm3Obtaining spraying gas and absorption liquid;
(2) carrying out heat exchange and temperature rise on the absorption liquid in a second heat exchange device 4, and then carrying out triple-effect countercurrent evaporation and concentration to obtain evaporation gas and concentrated liquid, wherein the volume ratio of the concentrated liquid to the absorption liquid is 2: 10;
(3) burning the concentrated solution in an incinerator, exchanging heat between the combustion gas and the absorption liquid obtained in the step (2) in a second heat exchange device 4, cooling, mixing with the spray gas obtained in the step (1), and performing tail gas treatment; the tail gas treatment is that the combustion gas, the spraying gas and the ozone generated by the ozone generator are mixed in the static mixer 9 and then are subjected to desulfurization and denitrification treatment; and (3) condensing the evaporated gas, flowing into a spraying liquid storage tank 3, and using the condensed gas as spraying liquid for the spraying absorption treatment in the step (1).
The desulfurization and denitrification method is the desulfurization and denitrification method disclosed in CN 110052139A, and the content of nitrogen oxides in the outer exhaust gas after desulfurization and denitrification is less than or equal to 30mg/Nm3The content of oxysulfide is less than or equal to 30mg/Nm3。
Application example 5
The application example provides a treatment method for treating VOCs waste gas by using the VOCs waste gas treatment system provided in embodiment 1, and the treatment method includes the following steps:
(1) the VOCs waste gas is cooled to 90 ℃ after flowing through the first heat exchange device 1, then flows into the spray tower 2 for spray absorption treatment, the spray liquid is ammonia water with mass fraction of 16%, and the liquid-gas ratio of the spray liquid to the VOCs waste gas is 5L/Nm3Obtaining spraying gas and absorption liquid;
(2) carrying out heat exchange and temperature rise on the absorption liquid in a second heat exchange device 4, and then carrying out triple-effect countercurrent evaporation and concentration to obtain evaporation gas and concentrated liquid, wherein the volume ratio of the concentrated liquid to the absorption liquid is 1: 10;
(3) burning the concentrated solution in an incinerator, exchanging heat between the combustion gas and the absorption liquid obtained in the step (2) in a second heat exchange device 4, cooling, mixing with the spray gas obtained in the step (1), and performing tail gas treatment; the tail gas treatment is that the combustion gas, the spraying gas and the ozone generated by the ozone generator are mixed in the static mixer 9 and then are subjected to desulfurization and denitrification treatment; and (3) condensing the evaporated gas, flowing into a spraying liquid storage tank 3, and using the condensed gas as spraying liquid for the spraying absorption treatment in the step (1).
The desulfurization and denitrification method is the desulfurization and denitrification method disclosed in CN 110052139A, and the content of nitrogen oxides in the outer exhaust gas after desulfurization and denitrification is less than or equal to 30mg/Nm3The content of oxysulfide is less than or equal to 30mg/Nm3。
In conclusion, the VOCs waste gas treatment system provided by the invention reduces the volatilization of the spray liquid in the spray unit and the usage amount of the spray liquid through the arrangement of the first heat exchange device 1, and reduces the cost of the liquid medicine; the VOCs waste gas treatment system provided by the invention does not need an additional external heat source through the arrangement of the second heat exchange device 4, thereby further saving energy and reducing cost; the temperature of the cooled combustion gas is further reduced after being mixed with the spray gas, and excessive decomposition of ozone can be avoided during ozone mixing, so that the ozone consumption is reduced; VOCs waste gas treatment system can handle VOCs waste gas effectively, makes the harmful substance in the VOCs waste gas burn after the concentration, has reduced the degree of difficulty of burning, has improved the treatment effect of VOCs waste gas.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.

Claims (10)

1. A VOCs waste gas treatment system is characterized by comprising a first heat exchange device, a spraying unit, a second heat exchange device, an evaporation unit, a combustion unit and a tail gas treatment unit;
a first heat exchange device is arranged on an air inlet pipeline through which the VOCs waste gas flows into the spraying unit;
a liquid outlet of the spraying unit is connected with a feed inlet of the evaporation unit, and a second heat exchange device is arranged on a connecting pipeline of the spraying unit and the evaporation unit;
the gas outlet of the evaporation unit is connected with the spraying unit, and the liquid outlet of the evaporation unit is connected with the combustion unit;
a combustion gas outlet of the combustion unit is connected with a heat source inlet of the second heat exchange device; and a heat source outlet of the second heat exchange device is connected with a gas outlet of the spraying unit and then connected with the tail gas treatment unit.
2. A VOCs effluent treatment system as claimed in claim 1 wherein the first and second heat exchange means each independently comprise a shell and tube heat exchanger and/or a plate heat exchanger.
3. The VOCs exhaust treatment system of claim 1 or 2, wherein the spray unit comprises a spray tower, a spray liquid storage tank, and a condenser;
a feed inlet of the condenser is connected with a liquid outlet of the evaporation unit, and a liquid outlet of the condenser is connected with a spray liquid outlet pipe;
the spraying liquid storage tank is used for providing spraying liquid for the spraying tower.
4. A VOCs waste gas treatment system as claimed in any one of claims 1 to 3, wherein the evaporation unit is any one of a triple effect evaporator, a quadruple effect evaporator or a quintuplet effect evaporator;
preferably, the triple-effect evaporator, the quadruple-effect evaporator or the quintuple-effect evaporator is respectively and independently a cocurrent flow evaporator, a countercurrent flow evaporator or an advection flow evaporator;
preferably, the combustion unit comprises a combustion furnace and/or an incinerator.
5. A VOCs exhaust treatment system according to any of claims 1-4, wherein the exhaust treatment system comprises an ozone generator, a static mixer, and a SOx tower;
and the air inlet of the static mixer is used for connecting a heat source outlet of the second heat exchange device, an air outlet of the spraying unit and an ozone outlet of the ozone generator, and the air outlet of the static mixer is connected with the air inlet.
6. A method for treating an exhaust gas containing VOCs using the system for treating an exhaust gas containing VOCs as claimed in any one of claims 1 to 5, comprising the steps of:
(1) carrying out spray absorption treatment on the VOCs waste gas subjected to temperature reduction and heat exchange to obtain spray gas and absorption liquid;
(2) carrying out evaporation concentration on the absorption liquid after heat exchange and temperature rise to obtain evaporation gas and concentrated liquid;
(3) burning the concentrated solution, exchanging heat between the combustion gas and the absorption liquid obtained in the step (2) for cooling, mixing the combustion gas with the spray gas obtained in the step (1), and carrying out tail gas treatment; and (3) condensing the evaporated gas to be used as spraying liquid for the spraying absorption treatment in the step (1).
7. The treatment method according to claim 6, wherein the temperature of the VOCs waste gas after temperature reduction and heat exchange in the step (1) is 60-90 ℃, preferably 70-80 ℃;
preferably, the spraying liquid of the spraying absorption treatment in the step (1) is ammonia water with mass fraction of 16-24%;
preferably, in the spray absorption treatment in the step (1), the liquid-gas ratio of the spray liquid to the VOCs waste gas is 0.5-5L/Nm3。
8. The process of claim 6 or 7, wherein the concentration by evaporation in step (2) is any one of triple effect concentration by evaporation, quadruple effect concentration by evaporation or quintuple effect concentration by evaporation;
preferably, the evaporative concentration includes any one of cocurrent evaporative concentration, countercurrent evaporative concentration, or advection evaporative concentration.
9. The treatment method according to any one of claims 6 to 8, wherein the tail gas treatment in the step (3) is a desulfurization and denitrification treatment after mixing the combustion gas, the spray gas and the ozone.
10. A method of treatment according to any one of claims 6-9, characterized in that it comprises the steps of:
(1) carrying out spray absorption treatment on the VOCs waste gas at 60-90 ℃ after temperature reduction and heat exchange, wherein the spray liquid is ammonia water with the mass fraction of 16-24%, and the liquid-gas ratio of the spray liquid to the VOCs waste gas is 0.5-5L/Nm3Obtaining spraying gas and absorption liquid;
(2) carrying out evaporation concentration on the absorption liquid after heat exchange and temperature rise to obtain evaporation gas and concentrated liquid;
(3) burning the concentrated solution, exchanging heat between the combustion gas and the absorption liquid obtained in the step (2) for cooling, mixing the combustion gas with the spray gas obtained in the step (1), and carrying out tail gas treatment; the tail gas treatment is that the combustion gas, the spraying gas and the ozone are mixed and then subjected to desulfurization and denitrification treatment; and (3) condensing the evaporated gas to be used as spraying liquid for the spraying absorption treatment in the step (1).
CN201911307601.6A 2019-12-18 2019-12-18 VOCs waste gas treatment system and treatment method Pending CN110841431A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911307601.6A CN110841431A (en) 2019-12-18 2019-12-18 VOCs waste gas treatment system and treatment method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911307601.6A CN110841431A (en) 2019-12-18 2019-12-18 VOCs waste gas treatment system and treatment method

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Publication Number Publication Date
CN110841431A true CN110841431A (en) 2020-02-28

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Country Link
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