WO2022042760A1

WO2022042760A1 - Treatment apparatus and treatment method for exhaust gas containing organic matter

Info

Publication number: WO2022042760A1
Application number: PCT/CN2021/121255
Authority: WO
Inventors: 何林; 李鑫钢; 郑成功; 隋红
Original assignee: 天津大学
Priority date: 2020-08-28
Filing date: 2021-09-28
Publication date: 2022-03-03
Also published as: CN111939728A

Abstract

Disclosed is a treatment apparatus for exhaust gas containing organic matter. The treatment apparatus comprises, connected in sequence, an absorption unit, a condensing unit, and an adsorption and desorption unit. By arranging a first heat exchange apparatus and a phase separation apparatus inside the adsorption and desorption unit, the problem of not meeting standards with respect to the emission of exhaust gas containing organic matter and the secondary pollution problem of desorption gas are effectively solved. Also disclosed is a treatment method for exhaust gas containing organic matter. In the treatment method, after the absorption, condensation and adsorption of exhaust gas containing organic matter, the organic matter content is greatly reduced, thus, the method may be used to treat various organic matter and has a wide range of applications. Meanwhile, after cooling and gas-liquid separation, the desorption gas goes through a cycle of re-absorption and/or re-adsorption, thereby effectively solving the secondary pollution problem of the desorption gas.

Description

A kind of treatment device and treatment method of waste gas containing organic matter

technical field

The embodiments of the present application relate to the technical field of environmental protection, such as the technical field of waste gas treatment, and in particular, to a treatment device and a treatment method for waste gas containing organic matter.

Background technique

As a special pollutant in the petrochemical industry, organic waste gas mainly comes from production equipment leakage, waste liquid treatment, solvent volatilization and organized and unorganized emissions. The untreated discharge of organic waste gas causes pollution to the environment, and also has a serious impact on the human nerve and immune system. At the same time, it is easy to produce secondary pollution such as aerosols, causing more serious environmental problems. Therefore, the treatment technology of organic waste gas is improved. have important meaning.

There are still many problems in the existing organic waste gas treatment system: the washing effect is not complete; the removal rate of dust particles containing paint mist is low; the washing water volume is huge; the treatment equipment is huge and occupies a large area of the workshop. The treated exhaust gas is not easy to meet the emission standard "Air Pollution Comprehensive Emission Standard" GB16297-1996, and the treatment method is single.

CN107569973A discloses a method and system for absorbing and treating VOC organic waste gas. The method includes: separating part of organic matter from VOC organic waste gas by a condensation unit, and then fully contacting the waste gas with an absorbent in an absorption device, and the organic matter in the waste gas is absorbed by the absorbent After absorption and purification, it is discharged, and the absorbent is converted into absorbent rich liquid; the rich liquid can be vacuum extracted or heated in the desorption device or contacted with the purge gas in reverse, so that the organic matter in the absorbent rich liquid can be desorbed to obtain regenerated absorption. The absorbent lean liquid is transported to the absorption device for recycling, and the desorbed gas enriched with organic matter is condensed, incinerated or oxidized, but the amount of absorbent for absorption treatment is high and the processing equipment is large.

CN207507225U discloses an organic waste gas absorption system. The system includes a blower, a waste gas storage tank, a gas buffer tank, a rotating packed bed, an absorbent storage tank, a diaphragm pump and a waste liquid storage tank. The blower blows out two paths of air, The first path of air enters the waste gas storage tank, carrying the waste gas into the gas buffer tank, the second path of air directly enters the gas buffer tank, and is fully mixed with the waste gas carried by the first path of air, and the adjusted waste gas enters the A rotating packed bed, the absorbent in the absorbent storage tank is transported to the rotating packed bed by the diaphragm pump, and the absorbent after absorbing the exhaust gas enters the waste liquid storage tank from the bottom of the rotating packed bed, and the purified The gas is directly discharged, but the device still focuses on the absorption method to treat the organic waste gas, which also has the problems of incomplete absorption and high consumption of absorbent.

CN103394246A discloses a comprehensive treatment method for organic waste gas and an organic waste gas treatment device. In the method, the organic waste gas is absorbed and adjusted by an absorption regulating liquid, biological ecological treatment and UV catalytic photolysis treatment in sequence, and the absorption and regulation of the absorption regulating liquid can remove the organic waste gas. and adjust the concentration of volatile organic compounds in the organic waste gas entering the biological ecological treatment. The organic matter can also be sterilized and deodorized, but the device and method are difficult to be applied industrially, and the application prospect is limited.

Therefore, it is necessary to develop a treatment device and treatment method for waste gas containing organic matter, to solve the problems of high consumption of existing absorbent and incomplete absorption, especially for waste gas containing mixed organic and inorganic pollutants or organic compounds containing a variety of different properties. Pollutant waste gas is treated.

SUMMARY OF THE INVENTION

The following is an overview of the topics detailed in this article. This summary is not intended to limit the scope of protection of the claims.

In view of the problems existing in the related art, the present application provides a treatment device and a treatment method for waste gas containing organic matter. The treatment device and the treatment method can effectively solve the problem of substandard discharge of waste gas containing organic matter and the problem of re-pollution of desorbed gas, and can treat various organic matter and inorganic waste gas, and have a wide range of applications. The desorbed gas is cooled and separated from the gas and liquid and then recycled and absorbed and/or adsorbed, which effectively solves the problem of re-contamination of the desorbed gas.

In a first aspect, the present application provides a treatment device for waste gas containing organic matter, the treatment device includes an absorption unit, a condensation unit, and an adsorption and desorption unit connected in sequence; the adsorption and desorption unit includes an adsorption device, a first A heat exchange device and a phase separation device; the upper part of the phase separation device is provided with a first gas outlet, and the first gas outlet is connected to the absorption unit and/or the adsorption device.

The treatment device for organic-containing waste gas provided by the present application can treat different types of organic-containing waste gas by combining an absorption unit, a condensation unit and an adsorption-desorption unit, and effectively reduce the content of organic substances in the organic-containing waste gas; The application further sets a first heat exchange device and a phase separation device in the adsorption and desorption unit, which can condense the desorbed gas generated by the desorption and then separate the gas and liquid, and then circulate the uncondensed gas to the absorption unit and/or adsorption Cyclic absorption and/or adsorption is carried out in the device, which effectively realizes the transfer of the organic gas in the organic-containing waste gas to the liquid phase, and the combination of subsequent desorption, condensation, gas-liquid separation and re-adsorption. On the one hand, the transfer of waste gas containing organic matter from gas phase to liquid phase can be realized with a small amount of initial absorbent; The problem of reaching the standard and the problem of re-pollution of desorbed gas; and the device in this application is simple, and can be applied to different organic systems or organic and inorganic mixed waste gas systems, and has broad application prospects.

In the present application, the condensation unit can not only condense the absorbent or water entrained in the gas, but also reduce the influence on the adsorbent in the adsorption and desorption unit.

Preferably, the absorption unit comprises absorption means.

Preferably, the absorption device is an absorption tower.

Preferably, an absorbent liquid feeding device is provided at the top of the absorption tower, such as an absorbent spraying device.

In the present application, an absorbent liquid feeding device is arranged at the top of the absorption tower, so that the absorbent can be fully contacted with the waste gas containing organic matter, and the absorption efficiency is improved.

Preferably, packing and/or trays are provided in the absorption device.

Preferably, the upper part of the absorption device is provided with a tray, and the lower part is provided with packing.

In the present application, it is preferable to set up a tray in the upper part of the absorption device, and set up a packing in the lower part, which can take into account the requirement of spray volume and gas-liquid mass transfer efficiency, and improve the absorption effect.

Preferably, a waste gas inlet containing organic matter is provided on one side of the bottom of the absorption device.

Preferably, the first gas outlet is connected to an organic-containing waste gas inlet.

Preferably, the first gas outlet is connected to one side of the bottom of the absorption device.

Preferably, the top of the absorption device is provided with a gas outlet containing organic matter.

Preferably, an absorbent inlet is provided on one side of the top of the absorption device.

Preferably, an absorbent outlet is provided at the bottom of the absorption device.

Preferably, the absorbent outlet is connected to a waste liquid treatment unit. The waste liquid treatment unit may be, for example, a waste water treatment unit.

In the present application, the absorbent outlet is set to be connected to the waste liquid treatment unit, and the absorbed absorbent part is sent to the waste liquid treatment unit for waste liquid treatment, so as to realize pollution-free discharge in the whole process.

Preferably, an absorbent circulation inlet is provided on one side of the middle of the absorption device.

Preferably, the outlet of the waste liquid treatment unit is connected to the absorbent circulation inlet.

In the present application, an in-situ waste liquid treatment unit can be arranged between the absorbent outlet and the absorbent circulation inlet, and the liquid outlet from the liquid phase outlet is completely recycled to the absorbent circulation inlet after in-situ treatment by the waste liquid treatment unit for circulation. absorption, can better improve the absorption effect.

Preferably, the absorption unit further comprises an absorbent circulation pump connecting the absorbent outlet and the absorbent circulation inlet.

The present application can reduce the amount of absorbent by setting the absorbent circulation inlet and the absorbent circulation pump.

Preferably, a second heat exchange device is provided between the circulation pump and the absorbent circulation inlet.

Preferably, the absorption unit further comprises an absorbent feed pump connected to the absorbent inlet.

Preferably, the condensing unit includes a condensing device connected to the outlet of the organic-containing gas.

Preferably, the top of the condensation device is provided with a non-condensable gas outlet, and the bottom is provided with a condensed liquid outlet.

Preferably, the condensate outlet is connected to a waste liquid treatment unit.

In the present application, the condensate outlet is connected to the waste liquid treatment unit, and the liquid after the condensate is sent to the waste liquid treatment unit for waste liquid treatment, so as to realize pollution-free discharge in the whole process.

Preferably, the non-condensable gas outlet is connected to the first gas inlet of the adsorption device.

Preferably, the condensation device is further provided with a condensation medium inlet and a condensation medium outlet.

Preferably, the adsorption device includes at least two groups of adsorption towers arranged in parallel.

Preferably, the group of adsorption towers includes at least one adsorption tower.

Preferably, the adsorption tower is provided with a first gas inlet at the bottom and a second gas outlet at the top.

Preferably, the first gas outlet is connected to the first gas inlet.

Preferably, the second gas outlet is connected to a chimney.

Preferably, the adsorption-desorption unit further includes a vacuum pump arranged between the adsorption device and the first heat exchange device.

Preferably, the lower part of the phase separation device is provided with a liquid phase outlet.

Preferably, the liquid phase outlet is connected to a waste liquid treatment unit.

The present application has no special requirements for the waste liquid treatment unit, and any device or process known to those skilled in the art that can be used to treat organic waste liquid can be used.

Preferably, the waste liquid treatment unit includes any one or a combination of at least two of an oxidative degradation device, a chemical conversion device or a biological degradation device, wherein a typical non-limiting combination is a combination of an oxidative degradation device and a chemical conversion device , a combination of oxidative degradation units and biodegradation units, and a combination of chemical conversion units and biodegradation units.

Preferably, a liquid-liquid separation unit is provided before the waste liquid treatment unit.

When the organic matter-containing waste gas contains organic matter that is insoluble in the absorbent and the freezing point of the organic matter is relatively high (-15 to 5°C) and condenses, the present application preferably sets a liquid-liquid separation unit to realize the separation of two phases in the liquid phase. , wherein, the absorbent at the outlet of the absorbent phase of the liquid-liquid separation is recycled to the absorption unit after post-processing, and the non-absorbent phase is subjected to waste liquid treatment.

Preferably, the liquid-liquid separation unit includes an oil-water separation device.

In this application, when the absorbent is an aqueous phase (acid-containing, alkali-containing or salt-containing are all aqueous phases), the liquid-liquid separation unit is an oil-water separation device, and the condensed organic liquid that is insoluble in the water phase is separated. Separation of the phase and the water phase of the absorbent, the separated organic liquid phase enters the organic waste liquid treatment device in the wastewater treatment unit, the water phase enters the water phase treatment device in the wastewater treatment unit for post-treatment, and the treated water phase can be recycled It can be recycled to the absorption device for circulatory absorption, and it can also be treated as other water, which is not particularly limited, and it is preferably recycled to the absorption device for circulatory absorption.

In this application, when the absorbent is an oil phase (gasoline, diesel oil, solvent oil, etc.), the liquid phase is a homogeneous system, and other operations such as the above-mentioned absorbent are the operations of the water phase, but the gas phase at the top of the absorption tower is an equilibrium state the oily gas phase.

In a second aspect, the present application provides a method for treating waste gas containing organic matter, and the treatment method is performed by using the device for treating waste gas containing organic matter described in the first aspect.

The method for treating organic-containing waste gas provided by the present application adopts the treatment device for organic-containing waste gas provided in the first aspect, and the desorbed gas is condensed and then cyclic adsorption operation, which ensures that the exhaust gas meets the standard.

Preferably, the processing method includes the following steps:

(1) The waste gas containing organic matter is sent to the absorption unit for absorption treatment, and the gas phase after absorption and the liquid phase of the absorbent are obtained;

(2) after the described absorption of step (1), the gas phase enters the condensation unit and undergoes the first condensation treatment to obtain non-condensable gas and condensate;

(3) After the non-condensable gas in step (2) enters the absorption unit from the first gas inlet for cyclic absorption or enters the adsorption device for cyclic adsorption, purified gas is obtained;

After the adsorption is saturated, the adsorption device is desorbed, and the desorbed gas is sent to the first heat exchange device for subsequent condensation treatment and gas-liquid separation. The first gas inlet of the device performs cyclic adsorption.

The method for treating organic-containing waste gas described in the present application can effectively realize the adsorption of organic-containing waste gas and reduce the content of organic substances in organic-containing waste gas due to the use of desorption, condensation, gas-liquid separation and re-absorption and/or adsorption processes. , and can be operated continuously and can be produced in large-scale industrial production.

The method for treating waste gas containing organic matter provided in this application is suitable for waste gas containing organic matter, and the organic matter includes methanol, formaldehyde, formic acid, ethanol, acetic acid, carbon disulfide, vinyl chloride, propanol, isopropanol, acetone, ether, acetonitrile, Ethyl acetate, butanol, methyl ethyl ketone, isobutanol, isobutyl ether, polychloromethane, polychloroethane, tetrahydrofuran, triethylamine, pyridine, dimethyl carbonate, sulfadoxine, nitrocarbazide Any one or a combination of at least two of amide, azide, benzene, toluene, ethylbenzene, xylene, or styrene.

Preferably, the organic-containing waste gas also contains any one or a combination of at least two inorganic substances such as hydrofluoric acid, hydrochloric acid, hydrogen sulfide, sulfur dioxide, ammonia, nitrogen monoxide or nitrogen dioxide.

Preferably, the temperature of the waste gas containing organic matter in step (1) is less than or equal to 60°C, such as 60°C, 58°C, 55°C, 54°C, 52°C, 50°C, 48°C, 45°C, 40°C, 35°C, 30°C, 28°C, 25°C or 20°C, etc. It is not limited to the above-mentioned specific numerical values, and can be any numerical value within the above-mentioned range. Due to space limitations and for the sake of brevity, this application will not list them exhaustively.

In the present application, when the temperature of the waste gas containing organic matter is greater than 60° C., the waste gas containing organic matter is first subjected to heat exchange and then subjected to absorption treatment.

In the present application, the temperature of the exhaust gas containing organic matter is controlled to be less than or equal to 60°C, which can better ensure the absorption efficiency.

Preferably, the pressure of the absorption treatment is 95-120kPa, for example, 95kPa, 96kPa, 98kPa, 100kPa, 101kPa, 102kPa, 105kPa, 110kPa, 115kPa, 118kPa or 120kPa, etc.

Preferably, the absorbent for the absorption treatment comprises an aqueous phase or an oil phase, preferably an aqueous phase.

Preferably, the aqueous phase comprises alkaline water, acidic water, tap water or desalinated water, preferably desalted water.

In the present application, when the waste gas containing organic substances contains more acidic gases, the absorbent is preferably alkaline water, and the alkaline water refers to water containing alkaline substances, such as sodium hydroxide. and/or potassium hydroxide, etc.; when the waste gas containing organic substances contains more alkaline gas, the acidic water refers to water containing acidic substances, such as sulfuric acid, hydrochloric acid and/or nitric acid, etc. .

Preferably, the salt content in the desalted water is 1-5 mg/L, for example, 1 mg/L, 1.5 mg/L, 2 mg/L, 2.5 mg/L, 3 mg/L, 3.5 mg/L, 4 mg/L, 4.5mg/L or 5mg/L, etc.

Preferably, the feed mass ratio of the absorbent to the waste gas containing organic matter is 0.01-5kg:1m ³ , for example, it can be 0.01kg:1m ³ , 0.05kg:1m ³ , 0.1kg:1m ³ , 0.3kg:1m ^3. 0.5kg: 1m ³ , 0.8kg: 1m ³ , 1kg: 1m ³ , 2kg: 1m ³ , 3kg: 1m ³ , 4kg: 1m ³ or 5kg: 1m ³ , etc. It is not limited to the above-mentioned specific numerical values, and can be any numerical value within the above-mentioned range. Due to space limitations and for the sake of brevity, this application will not list them exhaustively.

Preferably, the absorbent liquid phase is discharged from the absorbent outlet.

Preferably, the liquid phase of the absorbent is circulated to the middle of the absorption device through the absorbent circulating pump.

Preferably, the circulating amount of the liquid phase of the absorbent accounts for 80-95wt% of the total liquid phase of the absorbent, such as 80wt%, 82wt%, 83wt%, 84wt%, 85wt%, 86wt%, 87wt%, 88wt% , 89wt%, 90wt%, 91wt%, 92wt%, 93wt%, 94wt% or 95wt% etc. It is not limited to the above-mentioned specific numerical values, and can be any numerical value within the above-mentioned range. Due to space limitations and for the sake of brevity, this application will not list them exhaustively.

The ratio of the circulating amount of the absorbent in the liquid phase to the total liquid phase of the absorbent mentioned in this application refers to the ratio of the amount of the absorbent returned from the bottom of the absorption device to the middle of the absorption device to the total amount of the bottom of the absorbent.

Preferably, the temperature of the first condensation treatment in step (2) is -15°C to 10°C, for example, it can be -15°C, -13°C, -10°C, -11°C, -9°C, -7°C, -5°C, -4°C, -3°C, -2°C, -1°C, 0°C, 2°C, 3°C, 4°C, 5°C, 6°C, 8°C or 10°C, etc. It is not limited to the above-mentioned specific numerical values, and can be any numerical value within the above-mentioned range. Due to space limitations and for the sake of brevity, this application will not list them exhaustively.

The temperature of the first condensation treatment of the present application is controlled at -15-10°C, within this temperature range, substances such as desalinated water entrained in the gas after absorption can be effectively removed, and the impact on the subsequent adsorption effect of the adsorbent can be reduced.

Preferably, the condensate is sent to a waste liquid treatment unit for waste liquid treatment.

Preferably, the adsorbent described in step (3) comprises any one or a combination of at least two of activated carbon, molecular sieve, silica gel or carbon fiber, wherein a typical non-limiting combination is a combination of activated carbon and silica gel, activated carbon and The combination of carbon fiber, the combination of silica gel and carbon fiber, the combination of activated carbon, molecular sieve, silica gel and carbon fiber.

Preferably, at least one group of at least two parallel adsorption tower groups of the adsorption device performs adsorption operation.

The adsorption device provided by the present application has at least two sets of parallel devices. When there are two sets of parallel devices, one is open and the other is operated alternately. When there are multiple sets of parallel devices, at least one set is in the adsorption state to ensure the continuous operation of the device. run.

Preferably, the desorption is vacuum desorption or steam desorption, preferably vacuum desorption.

The present application preferably adopts the method of vacuum desorption, no new substances are introduced, the damage to the adsorbent is less, and the desorption efficiency is high, and the service life of the adsorbent is improved.

Preferably, the pressure of the vacuum desorption is 1-30 kPa, for example, 1 kPa, 3 kPa, 5 kPa, 7 kPa, 9 kPa, 11 kPa, 13 kPa, 15 kPa, 17 kPa, 19 kPa, 21 kPa, 23 kPa, 25 kPa, 27 kPa or 30 kPa, etc. It is not limited to the above-mentioned specific numerical values, and can be any numerical value within the above-mentioned range. Due to space limitations and for the sake of brevity, this application will not list them exhaustively.

In the present application, the pressure of vacuum desorption is controlled to be 1-30 kPa, so as to ensure the desorption effect of organic matter and the service life of the adsorbent.

Preferably, the vacuum desorption is carried out in a protective atmosphere.

Preferably, the protective atmosphere includes a nitrogen atmosphere.

In the present application, desorption is carried out under the protection of nitrogen atmosphere, the operation is safe and reliable, and the service life of the adsorbent is increased.

Preferably, the temperature of the second condensation treatment is -15°C to 10°C, for example, it can be -15°C, -12°C, -10°C, -9°C, -8°C, -7°C, -6°C, - 5°C, -2°C, 0°C, 1°C, 2°C, 3°C, 4°C, 5°C, 7°C, 8°C, 9°C or 10°C, etc. It is not limited to the above-mentioned specific numerical values, and can be any numerical value within the above-mentioned range. Due to space limitations and for the sake of brevity, this application will not list them exhaustively.

In the present application, the temperature of the second condensation treatment is -15-10°C, which can effectively realize the condensation of most organic substances and convert them into liquid phase, which can better take into account the energy consumption and the treatment effect of waste gas containing organic substances.

As the preferred technical solution of the present application, the method comprises the following steps:

(1) The waste gas containing organic matter with a temperature of ≤60°C is sent to the absorption tower from the inlet of the waste gas containing organic matter, and the absorbent enters the absorption tower from the inlet of the absorbent to absorb and treat the waste gas containing organic matter. The absorption outlet is discharged, 5~20wt% is sent to the waste liquid treatment unit for waste liquid treatment, and 80~95wt% is sent to the middle of the absorption tower by the absorbent circulating pump for circulation; after absorption, the gas phase is discharged from the gas outlet containing organic matter;

Wherein, the feed mass ratio of the absorbent and the waste gas containing organic matter is 0.01-5kg:1m ³ ;

(2) Step (1) after the absorption, the gas phase enters the condensing device and undergoes a first condensation treatment at -15 to 10 ° C to obtain non-condensable gas and condensed liquid; the condensed liquid is sent to the waste liquid treatment unit for waste liquid treatment ;

(3) The non-condensable gas described in step (2) enters the adsorption tower group for adsorption operation from the first gas inlet, and at least one group of the at least two groups of parallel adsorption tower groups performs adsorption operation to obtain purified gas;

After the adsorption is saturated, the adsorption device is desorbed by means of vacuum desorption, and the pressure of the vacuum desorption is 1-30 kPa, and the vacuum desorption is carried out in a nitrogen atmosphere;

The desorbed gas is sent to the first heat exchange device at -15 to 10°C after the second condensation treatment, and then enters the phase separation device for gas-liquid separation. Or return to the first gas inlet of the adsorption device for cyclic adsorption;

The liquid phase after the gas-liquid separation is sent to the waste liquid treatment unit for waste liquid treatment.

When the organic matter-containing waste gas contains partially water-soluble organic matter and partially water-insoluble organic matter, as a preferred technical solution of the present application, the method comprises the following steps:

After the adsorption is saturated, the adsorption device is desorbed by means of vacuum desorption, and the pressure of the vacuum desorption is 1-10 kPa, and the vacuum desorption is carried out in a nitrogen atmosphere;

The liquid phase after the gas-liquid separation is sent to the liquid-liquid separation unit for oil-water separation, and the oil phase after the oil-water separation enters the oil-phase treatment device in the waste liquid treatment unit for processing; the water phase after the oil-water separation enters the waste liquid The water phase treatment device in the treatment unit is used for treatment.

When the organic-containing waste gas contains some inorganic substances, as a preferred technical solution of the present application, the method preferably returns the gas-liquid separation gas phase to the organic-containing waste gas inlet of the absorption device for circulating absorption.

Compared with the related art, the embodiments of the present application have at least the following beneficial effects:

(1) The treatment device of the organic-containing waste gas provided in the embodiment of the present application adopts the combination of absorption-condensation-adsorption-desorption device, which ensures that the exhaust gas reaches the standard;

(2) The adsorption-desorption unit of the organic-containing waste gas treatment device provided in the embodiment of the present application is provided with the operation of circulating absorption and/or circulating adsorption after the condensation and separation of the desorbed gas, so as to ensure the continuous operation of the device and the effect of adsorption, Effectively reduce the organic content in the gas after adsorption;

(3) The method for treating organic-containing waste gas provided in the embodiments of the present application solves the problem that the common method is difficult to reach the standard or damages the treatment device for the organic matter, especially the organic-inorganic mixture after treatment. The process is advanced and simple, and the whole process is different The parameters are automatically matched and controlled, and the application effect is good in the waste gas treatment project containing organic matter.

Other aspects will become apparent upon reading and understanding of the drawings and detailed description.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solutions of the present disclosure, and constitute a part of the specification, and together with the embodiments of the present application, they are used to explain the technical solutions of the present disclosure, and do not limit the technical solutions of the present disclosure.

FIG. 1 is a schematic diagram of a processing device and a process flow diagram of an organic-containing waste gas provided in Example 1 of the present application.

FIG. 2 is a schematic diagram of a processing device and a process flow diagram of an organic-containing waste gas provided in Example 2 of the present application.

FIG. 3 is a schematic diagram of a processing device and a process flow diagram of the waste gas containing organic matter provided in Example 3 of the present application.

FIG. 4 is a schematic diagram of a treatment device and a process flow diagram of organic-containing waste gas provided in Example 6 of the present application.

In the figure: 1 - absorption unit; 101 - absorbent feed pump; 102 - absorption tower; 103 - absorbent circulating pump; 104 - second heat exchange device; 2 - condensation unit; 3 - adsorption and desorption unit; 301 - 302-first heat exchange device; 303-phase separation device; 304-vacuum pump; 4-liquid-liquid separation unit; 5-waste liquid treatment unit; 501-oil phase treatment device; 502-water phase treatment device.

detailed description

The technical solutions of the present application will be further described below with reference to the accompanying drawings and through specific embodiments.

The present application is described in further detail below. However, the following examples are only simple examples of the present application, and do not represent or limit the protection scope of the present application. The protection scope of the present application is subject to the claims.

1. Example

Example 1

This embodiment provides a treatment device for waste gas containing organic matter. As shown in FIG. 1 , the treatment device includes an absorption unit 1 , a condensation unit 2 and an adsorption-desorption unit 3 that are connected in sequence.

The absorption unit 1 includes an absorption device; the absorption device is an absorption tower 102; the upper part of the absorption device is provided with a tray, and the lower part is provided with a filler; the bottom side of the absorption device is provided with an organic-containing waste gas inlet, and the top is provided with There is a gas outlet containing organic matter, an absorbent inlet is provided on one side of the top, and an absorbent outlet is provided at the bottom; the absorbent outlet is connected with the waste liquid treatment unit 5; one side of the middle of the absorption device is provided with an absorbent circulation inlet; The absorption unit 1 further includes an absorbent circulation pump 103 connecting the absorbent outlet and the absorbent circulation inlet, and a second heat exchange device 104 is arranged between the circulation pump and the absorbent circulation inlet. The absorption unit 1 further includes The absorbent feed pump 101 connected to the absorbent inlet.

The condensing unit 2 includes a condensing device connected with the gas outlet containing organic matter; the top of the condensing device is provided with a non-condensable gas outlet, and the bottom is provided with a condensing liquid outlet; the condensing liquid outlet is connected with the waste liquid treatment unit 5; The non-condensable gas outlet is connected to the first gas inlet of the adsorption device 301; the condensation device is also provided with a condensing medium inlet and a condensing medium outlet.

The adsorption and desorption unit 3 includes an adsorption device 301, a first heat exchange device 302 and a phase separation device 303 connected in sequence; a first gas outlet is provided on the upper part of the phase separation device 303, and the first gas outlet is connected to the adsorption device. The adsorption device 301 includes two parallel adsorption tower groups; an adsorption tower is arranged in the adsorption tower group; the size of the adsorption tower is DN1500mm×3500mm, and the adsorption tower is provided with an adsorbent, filled with The height is 2.0m, the bottom of the adsorption tower is provided with a first gas inlet, and the top is provided with a second gas outlet; the first gas outlet is connected with the first gas inlet; the second gas outlet is connected with the chimney; The desorption unit 3 also includes a vacuum pump 304 arranged between the adsorption device 301 and the first heat exchange device 302 ; a liquid phase outlet is arranged at the lower part of the phase separation device 303 ; the liquid phase outlet is connected to the waste liquid treatment unit 5 .

Example 2

This embodiment provides a treatment device for waste gas containing organic matter. As shown in FIG. 2 , the treatment device includes an absorption unit 1, a condensation unit 2, an adsorption and desorption unit 3, a liquid-liquid separation unit 4, and a waste liquid connected in sequence. processing unit 5.

The absorption unit 1 includes an absorption device; the absorption device is an absorption tower 102; the upper part of the absorption device is provided with a tray, and the lower part is provided with a filler; the bottom side of the absorption device is provided with an organic-containing waste gas inlet, and the top is provided with There is a gas outlet containing organic matter, an absorbent inlet is arranged on the top side, and an absorbent outlet is arranged at the bottom; the absorbent outlet is connected with the liquid-liquid separation unit 4; the absorbent circulation inlet is arranged on one side of the middle of the absorption device; The absorption unit 1 further includes an absorbent circulation pump 103 connected to the absorbent outlet and the absorbent circulation inlet, and the absorption unit 1 further includes an absorbent feed pump 101 connected to the absorbent inlet.

The condensing unit 2 includes a condensing device connected with the gas outlet containing organic matter; the top of the condensing device is provided with a non-condensable gas outlet, and the bottom is provided with a condensing liquid outlet; the condensing liquid outlet is connected with the liquid-liquid separation unit 4; The non-condensable gas outlet is connected to the first gas inlet of the adsorption device 301; the condensation device is also provided with a condensing medium inlet and a condensing medium outlet.

The adsorption and desorption unit 3 includes an adsorption device 301, a first heat exchange device 302 and a phase separation device 303 connected in sequence; a first gas outlet is provided on the upper part of the phase separation device 303, and the first gas outlet of the adsorption device 301 It is connected with the adsorption device 301; the adsorption device 301 includes two sets of parallel adsorption tower groups; one adsorption tower is arranged in the adsorption tower group; the size of the adsorption tower is DN2000mm×4000mm, and the adsorption tower is provided with There is adsorbent, and the filling height is 2.5m; the bottom of the adsorption tower is provided with a first gas inlet, and the top is provided with a second gas outlet; the first gas outlet is connected with the first gas inlet; the second gas outlet is connected with the chimney The adsorption and desorption unit 3 also includes a vacuum pump 304 arranged between the adsorption device 301 and the first heat exchange device 302; the lower part of the phase separation device 303 is provided with a liquid phase outlet; the liquid phase outlet is connected to the liquid-liquid The separation unit 4 is connected.

The liquid-liquid separation unit 4 includes an oil-water separation device. The oil-water separation device is provided with an oil-phase outlet and a water-phase outlet. The oil-phase outlet is connected to the oil-phase treatment device 501 of the waste liquid treatment unit 5. The outlet is connected to the water-phase treatment device 502 of the waste liquid treatment unit 5 , and the water-phase outlet of the water-phase treatment device 502 is connected to the absorbent inlet of the absorption unit 1 .

Example 3

This embodiment provides a treatment device for waste gas containing organic matter. As shown in FIG. 3 , the treatment device includes an absorption unit 1 , a condensation unit 2 and an adsorption and desorption unit 3 that are connected in sequence.

The absorption unit 1 includes an absorption device; the absorption device is an absorption tower 102; the upper part of the absorption device is provided with a tray, and the lower part is provided with a filler; the bottom side of the absorption device is provided with an organic-containing waste gas inlet, and the top is provided with There is a gas outlet containing organic matter, an absorbent inlet is provided on one side of the top, and an absorbent outlet is provided at the bottom; the absorbent outlet is connected with the waste liquid treatment unit 5; one side of the middle of the absorption device is provided with an absorbent circulation inlet; The absorption unit 1 further includes an absorbent circulation pump 103 connected to the absorbent outlet and the absorbent circulation inlet, and the absorption unit 1 further includes an absorbent feed pump 101 connected to the absorbent inlet.

The adsorption and desorption unit 3 includes an adsorption device 301, a first heat exchange device 302 and a phase separation device 303 connected in sequence; a first gas outlet is provided on the upper part of the phase separation device 303, and the first gas outlet of the adsorption device 301 It is connected with the waste gas inlet containing organic matter in the absorption device; the adsorption device 301 includes four parallel adsorption tower groups, wherein every two stages are operated alternately, and two series connected adsorption towers are arranged in the adsorption tower group; The size of the tower is DN1500mm×3500mm, the adsorption tower is provided with an adsorbent, and the filling height is 1.8m; the adsorption tower is provided with a first gas inlet at the bottom and a second gas outlet at the top; the second gas outlet is connected to the chimney The adsorption and desorption unit 3 also includes a vacuum pump 304 arranged between the adsorption device 301 and the first heat exchange device 302; the lower part of the phase separation device 303 is provided with a liquid phase outlet; the liquid phase outlet and waste liquid treatment Unit 5 is connected.

Example 4

This embodiment provides a treatment device for waste gas containing organic matter. The treatment device is the same as Embodiment 1 except that there is no absorbent circulation inlet on the middle side of the absorption device, and no absorbent circulation pump is provided.

Compared with Example 1, in Example 4, there is no component for absorbent circulation, and the recycling of absorbent cannot be realized. Compared with Example 1, the consumption of absorbent is large and the energy consumption is high.

Example 5

This embodiment provides a treatment device for waste gas containing organic matter. The treatment device is the same as that in Embodiment 1 except that only one adsorption tower is provided in the adsorption and desorption unit.

In Example 5, only one adsorption tower is set up. Compared with Example 1, when the absorbent in the adsorption tower is saturated with adsorption, the entire process needs to be stopped, and long-term continuous operation is not possible.

Example 6

This embodiment provides a treatment device for waste gas containing organic matter. The treatment device is the same as Embodiment 1 except that a vacuum pump is not provided in the adsorption and desorption unit, but a steam inlet is provided at the top of the adsorption tower.

In Example 6, the vacuum pump is not provided, but the steam inlet is used instead to desorb the adsorbent with steam. On the one hand, the steam energy consumption is high, and on the other hand, the introduction of steam causes damage to the adsorbent, which reduces the service life of the adsorbent. Moreover, the use of steam desorption increases the burden of subsequent condensation and gas-liquid separation, and the overall process economy decreases. This shows that the present application desorbs the adsorbent by setting a vacuum pump, which improves the service life of the adsorbent and the overall process. economy.

Example 7

This embodiment provides a treatment device for waste gas containing organic matter. As shown in FIG. 4 , except that the first gas outlet is connected to the waste gas inlet containing organic matter and the first gas inlet of the adsorption device at the same time, the rest of the treatment device is connected to Example 1 is the same.

In Example 7, the first gas outlet is connected to the absorption device and the adsorption device at the same time, and the gas from the first gas outlet can be selectively recycled to the absorption device or the adsorption device for the waste gas containing organic substances of different properties, so as to ensure the exhaust gas emission. Up to standard.

Comparative Example 1

This comparative example provides a treatment device for waste gas containing organic matter. The first heat exchange device and the phase separation device are not provided in the desorption unit of the treatment device, and the first heat exchange device and the phase separation device are not provided. Except for the connection relationship with other components, the rest are the same as those in Example 1.

Specifically, the adsorption and desorption unit includes an adsorption device; the adsorption device includes two parallel adsorption tower groups; an adsorption tower is arranged in the adsorption tower group; an adsorbent is arranged in the adsorption tower; A first gas inlet is arranged at the bottom of the adsorption tower, and a second gas outlet is arranged at the top; the second gas outlet is connected with the chimney; the adsorption and desorption unit further includes a vacuum pump connected with the adsorption device, and the vacuum pump is connected with the chimney.

In Comparative Example 1, the first heat exchange device and phase separation device are not provided. Compared with Example 1, the desorption gas after desorption cannot be treated, and the organic content in the desorption gas is high and enriched, which cannot be realized. The gas is discharged up to the standard, which shows that the present application realizes the cyclic adsorption after the condensation of the desorption gas by setting the first heat exchange device and the phase separation device, and can effectively ensure that the organic content in the clean gas after adsorption is low.

2. Application example

Application example 1

This application example provides a method for treating waste gas containing organic matter. The method is performed by using the treatment device provided in Example 1. As shown in FIG. 1 , the method specifically includes the following steps:

(1) Under normal temperature and pressure (25°C, 0.1MPa), the flow rate is 4000m ³ /h of organic-containing waste gas (composition of hydrofluoric acid 2.82mg/m ³ , acetone 250mg/m ³ , acetonitrile 220mg/m ³ , Dimethyl carbonate 230mg/m ³ , hydrogen chloride 92mg/m ³ ) is sent to the absorption tower 102 from the waste gas inlet containing organic matter through the absorbent feed pump 101, and the desalinated water with an amount of 7000kg/h enters the absorption tower 102 from the absorbent inlet , the normal pressure operation is used to absorb the waste gas containing organic matter. The temperature at the top of the absorption tower 102 is 15.2 ° C. The liquid phase of the absorbed absorbent is discharged from the absorption outlet, and 15wt% is sent to the waste liquid treatment unit for waste liquid treatment. 85wt% % is sent to the second heat exchange device 104 by the absorbent circulating pump 103 for heat exchange and then enters the middle of the absorption tower 102 for circulation; after absorption, the gas phase is discharged from the gas outlet containing organic matter;

(2) After the absorption of step (1), the gas phase enters the condensation device and undergoes a first condensation treatment at 5°C to obtain non-condensable gas and condensed liquid; the condensed liquid is sent to the waste liquid treatment unit for waste liquid treatment;

(3) The non-condensable gas described in step (2) enters the adsorption tower that is being adsorbed in the rotation operation from the first gas inlet, and the adsorbent is activated carbon to obtain purified gas; the purified gas after absorption-condensation-adsorption-desorption treatment Among them, acetone≤10mg/m ³ , acetonitrile≤10mg/m ³ , dimethyl carbonate≤20mg/m ³ , hydrofluoric acid≤1mg/m ³ , hydrogen chloride≤1mg/m ³ ;

The adsorption time is 4 days, the adsorption tower after the adsorption saturation stops adsorption, and the vacuum pump 304 is used to desorb the adsorption device 301 by means of vacuum desorption, and the pressure of the vacuum desorption is 6kPa, and the vacuum desorption adopts nitrogen gas protection;

The desorbed gas is sent to the first heat exchange device 302 at -5°C after the second condensation treatment, and then enters the phase separation device 303 for gas-liquid separation, and the gas phase from the gas-liquid separation returns to the first gas inlet of the adsorption device 301 for cyclic adsorption ;

Application example 2

This application example provides a method for treating waste gas containing organic matter. The method is carried out by using the treatment device provided in Example 2. The method specifically includes the following steps:

(1) Under normal temperature and pressure (25°C, 0.1MPa), the flow rate is 500m ³ /h of organic-containing waste gas (the composition is 30mg/m ³ nitrogen dimethyl acetamide, 160mg/m ³ acetic acid, 250mg/m methanol/ m ³ , benzene 89 mg/m ³ ) is sent to the absorption tower 102 from the waste gas inlet containing organic matter through the absorbent feed pump 101, and the desalinated water with a dosage of 250 kg/h enters the absorption tower 102 from the absorbent inlet. The organic waste gas is absorbed and treated. The temperature at the top of the absorption tower 102 is 16.6°C. The absorbed liquid phase of the absorbent is discharged from the absorption outlet, and 5wt% is sent to the waste liquid treatment unit 5 for waste liquid treatment, and 95wt% is recycled through the absorbent. The pump 103 is sent into the middle of the absorption tower 102 for circulation; after the absorption, the gas phase is discharged from the gas outlet containing organic matter;

(2) after the absorption of step (1), the gas phase enters the condensing device and is subjected to the first condensation treatment at 5°C to obtain non-condensable gas and condensate; the condensate is sent to the waste liquid treatment unit 5 for waste liquid treatment;

(3) The non-condensable gas described in step (2) enters the adsorption tower that is being adsorbed in the rotation operation from the first gas inlet, and the adsorbent is carbon fiber to obtain purified gas; the purified gas after absorption-condensation-adsorption-desorption treatment In, nitrogen dimethyl acetamide≤10mg/m ³ , acetic acid≤10mg/m ³ , methanol≤20mg/m ³ , benzene≤1mg/m ³ ;

The adsorption time is 7 days, the adsorption tower after adsorption saturation stops adsorption, and other groups of adsorption towers are used for adsorption; and the adsorption tower with adsorption saturation is desorbed by vacuum desorption. The vacuum desorption is protected by nitrogen gas;

The desorbed gas is sent to the first heat exchange device 302 at -10°C after the second condensation treatment, and then enters the phase separation device 303 for gas-liquid separation, and the gas phase from the gas-liquid separation returns to the first gas inlet of the adsorption device 301 for cyclic adsorption. ;

The liquid phase after the gas-liquid separation is sent to the oil-water separation device for oil-water separation, and the organic oil phase (mainly containing benzene) of the oil-water separation is sent to the oil-phase treatment device 501 of the waste liquid treatment unit 5 for processing; the oil-water separation The separated water phase is sent to the water phase treatment device 502 of the waste liquid treatment unit 5 for waste liquid treatment.

Application example 3

This application example provides a method for treating waste gas containing organic matter. The method is carried out by using the treatment device provided in Example 1. The method specifically includes the following steps:

(1) Under normal temperature and pressure (25°C, 0.1MPa), the flow rate is 2000m ³ /h of organic-containing waste gas (composition of dichloromethane 252mg/m ³ , ether 352mg/m ³ , ethanol 453mg/m ³ , three Ethylamine 345mg/m ³ , pyridine 243mg/m ³ ) is sent to the absorption tower from the waste gas inlet containing organic matter through the absorbent feed pump, and the desalinated water with the dosage of 3000kg/h enters the absorption tower from the absorbent inlet. The waste gas containing organic matter is absorbed and treated. The temperature at the top of the absorption tower is 21.6°C. The absorbed liquid phase of the absorbent is discharged from the absorption outlet, and 5wt% is sent to the waste liquid treatment unit for waste liquid treatment, and 95wt% is passed through the absorbent circulating pump. It is sent to the second heat exchange device for heat exchange and then sent to the middle of the absorption tower for circulation; after absorption, the gas phase is discharged from the gas outlet containing organic matter;

(3) The non-condensable gas described in step (2) enters the adsorption tower that is being adsorbed in the rotation operation from the first gas inlet, and the adsorbent is carbon fiber to obtain purified gas; the purified gas after absorption-condensation-adsorption-desorption treatment Among them, dichloromethane≤10mg/m ³ , diethyl ether≤10mg/m ³ , ethanol≤20mg/m ³ , triethylamine≤10mg/m ³ , pyridine≤10mg/m ³ ;

The adsorption time is 4 days, the adsorption tower after adsorption saturation stops adsorption, and the adsorption device is desorbed by a vacuum pump by means of vacuum desorption, and the pressure of vacuum desorption is 6kPa, and the vacuum desorption adopts nitrogen gas protection;

The desorbed gas is sent to the first heat exchange device at -15°C after the second condensation treatment, and then enters the phase separation device for gas-liquid separation, and the gas phase of the gas-liquid separation is returned to the first gas inlet of the adsorption device for cyclic adsorption;

Application example 4

(1) Under normal temperature and pressure (30°C, 0.1MPa), the flow rate is 6000m ³ /h of organic-containing waste gas (the composition is hydrofluoric acid 10.1mg/m ³ , acetone 145mg/m ³ , ethanol 550mg/m ³ , Acetonitrile 450mg/m ³ , dimethyl carbonate 230mg/m ³ , hydrogen chloride 110mg/m ³ ) are sent to the absorption tower from the waste gas inlet containing organic matter through the absorbent feed pump, and the desalinated water with the dosage of 1200kg/h is sent from the absorbent inlet After entering the absorption tower, the waste gas containing organic matter is absorbed and treated by normal pressure operation. The temperature at the top of the absorption tower is 15.1 ° C. The liquid phase of the absorbed absorbent is discharged from the absorption outlet, and 20wt% is sent to the waste liquid treatment unit for waste liquid treatment. , 80wt% is sent to the second heat exchange device by the absorbent circulating pump for heat exchange, and then sent to the middle of the absorption tower for circulation; after absorption, the gas phase is discharged from the gas outlet containing organic matter;

(2) After the absorption of step (1), the gas phase enters the condensation device and undergoes a first condensation treatment at -5°C to obtain non-condensable gas and condensed liquid; the condensed liquid is sent to the waste liquid treatment unit for waste liquid treatment;

(3) The non-condensable gas described in step (2) enters the adsorption tower that is being adsorbed in the rotation operation from the first gas inlet, and the adsorbent is activated carbon to obtain purified gas; the purified gas after absorption-condensation-adsorption-desorption treatment Among them, acetone≤10mg/m ³ , ethanol≤10mg/m ³ , acetonitrile≤10mg/m ³ , dimethyl carbonate≤20mg/m ³ , hydrofluoric acid≤1mg/m ³ , hydrogen chloride≤1mg/m ³ ;

The adsorption time is 2 days, the adsorption tower after adsorption saturation stops adsorption, and the adsorption device is desorbed by a vacuum pump by means of vacuum desorption, and the pressure of vacuum desorption is 5kPa, and the vacuum desorption adopts nitrogen gas protection;

Application example 5

This application example provides a method for treating waste gas containing organic matter. The method is carried out by using the treatment device provided in Embodiment 3. The method specifically includes the following steps:

(1) Under normal temperature and pressure (25°C, 0.1MPa), the flow rate is 15000m ³ /h of organic-containing waste gas (the composition is ethanol 155mg/m ³ , acetone 250mg/m ³ , acetonitrile 220mg/m ³ , ethyl acetate 645mg/m ³ , dimethyl carbonate 365mg/m ³ , hydrogen chloride 352mg/m ³ ) are fed into the absorption tower 102 from the waste gas inlet containing organic matter through the absorbent feed pump 101, and the desalinated water with an amount of 20000kg/h is removed from the absorbent. The inlet enters the absorption tower 102, and the normal pressure operation is used to absorb the waste gas containing organic matter. The temperature at the top of the absorption tower 102 is 14.5 ° C. The absorbed liquid phase of the absorbent is discharged from the absorption outlet, and 5wt% is sent to the waste liquid treatment unit 5. Carry out waste liquid treatment, 95wt% is sent to the middle of the absorption tower 102 through the absorbent circulating pump 103 for circulation; after absorption, the gas phase is discharged from the gas outlet containing organic matter;

(2) after the absorption of step (1), the gas phase enters the condensing device and undergoes a first condensation treatment at -10 ° C to obtain non-condensable gas and condensed liquid; the condensed liquid is sent to the waste liquid treatment unit 5 for waste liquid treatment;

(3) The non-condensable gas described in step (2) enters the adsorption tower that is being adsorbed in the rotation operation from the first gas inlet, and the adsorbent is activated carbon to obtain purified gas; the purified gas after absorption-condensation-adsorption-desorption treatment Among them, acetone≤10mg/m ³ , ethanol≤10mg/m ³ , acetonitrile≤10mg/m ³ , dimethyl carbonate≤20mg/m ³ , ethyl acetate≤1mg/m ³ , hydrogen chloride≤1mg/m ³ ;

The adsorption time is 8 days, the adsorption tower after the adsorption saturation stops adsorption, and the vacuum pump 304 is used to desorb the adsorption device 301 by means of vacuum desorption, and the pressure of the vacuum desorption is 10kPa, and the vacuum desorption adopts nitrogen gas protection;

The desorbed gas is sent to the first heat exchange device 302 at 5°C after the second condensation treatment, and then enters the phase separation device 303 for gas-liquid separation. cyclic absorption;

The liquid phase after the gas-liquid separation is sent to the waste liquid treatment unit 5 for waste liquid treatment.

Application example 6

This application example provides a method for treating waste gas containing organic matter. The method is carried out by using the treatment device provided in Example 1, except that in step (2), "the gas phase after absorption enters the condensing device and undergoes a process at 5°C. Except that "the first condensation treatment" is replaced with "the gas phase after absorption enters the condensation device and undergoes the first condensation treatment at 12°C", the rest of the process and process parameters are the same as in Application Example 1.

Application example 7

This application example provides a method for treating waste gas containing organic matter. The method is carried out by using the treatment device provided in Example 1, except that in step (2), "the gas phase after absorption enters the condensing device and undergoes a process at 5°C. Except that "the first condensation treatment" is replaced with "the gas phase after absorption enters the condensation device and undergoes the first condensation treatment at -20°C", the rest of the process and process parameters are the same as those of Application Example 1.

Application example 8

This application example provides a method for treating waste gas containing organic matter. The method is carried out by using the treatment device provided in Example 1. In the method, except that the pressure of vacuum desorption in step (3) is 25kPa, the rest of the process and process parameters All are the same as application example 1.

Application example 9

This application example provides a method for treating waste gas containing organic matter. The method is carried out by using the treatment device provided in Example 1. In the method, in step (3), “the desorbed gas is sent to the first heat exchange device and The procedure and process parameters are the same as in Application Example 1, except that "the desorbed gas is sent to the first heat exchange device for the second condensation treatment at 22°C" is replaced by "the second condensation treatment at -10 °C".

Comparing Application Example 1 and Application Examples 6 to 7, it can be seen that the temperature of the first condensation in Application Example 1 is 12°C, compared with the temperatures of the first condensation treatment in Application Example 6 and Application Example 7, which are 12°C and − In terms of 20°C, in Application Example 1, not only the organic matter content in the organic-containing waste gas after adsorption is low, but also the service life of the adsorbent is longer; while in Application Example 6, the service life of the adsorbent is shorter than that in Application Example 1, and in Application Example 7, the overall The energy consumption is high and the adsorption effect is not significantly improved, which shows that the application preferably controls the temperature of the first condensation treatment at -15-10°C, which can take into account energy consumption, adsorption effect and service life of the adsorbent.

Comparing Application Example 1 and Application Example 8, it can be seen that the pressure of vacuum desorption in Application Example 8 is 25kPa. Compared with Application Example 1, the organic matter adsorbed in the adsorbent in Application Example 8 is difficult to desorb completely, which shows that , the present application preferably controls the pressure of vacuum desorption within a specific range and adopts nitrogen protection, which can ensure the safety of operation and improve the desorption efficiency, thereby ultimately improving the subsequent adsorption effect.

Comparing Application Example 1 and Application Example 9, it can be seen that the temperature of the second condensation in Application Example 9 is 22 ° C, and most of the organic matter cannot be condensed, so it is recycled to the adsorption tower for adsorption, and the energy consumption is high and affects the overall organic matter. the amount of exhaust gas treated.

To sum up, the device and method for treating waste gas containing organic substances provided by the present application can effectively solve the problem of substandard discharge of waste gas containing organic substances and the problem of re-pollution of desorbed gas, and can treat various organic substances, with application prospects widely.

The applicant declares that the present application illustrates the detailed structural features of the present application through the above embodiments, but the present application is not limited to the above detailed structural features, which does not mean that the present application must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvement to this application, equivalent replacement of components selected in this application, addition of auxiliary components, selection of specific methods, etc., all fall within the scope of protection and disclosure of this application.

Claims

A treatment device for waste gas containing organic matter, which comprises an absorption unit, a condensation unit and an adsorption and desorption unit connected in sequence;

The adsorption and desorption unit includes an adsorption device, a first heat exchange device and a phase separation device connected in sequence;

The upper part of the phase separation device is provided with a first gas outlet, and the first gas outlet is connected to the absorption unit and/or the adsorption device.
The treatment device of claim 1, wherein the absorption unit comprises an absorption device.
The processing device of claim 2, wherein the absorption device is an absorption tower.
The processing device according to claim 2, wherein a packing and/or a tray is arranged in the absorption device;

Preferably, the upper part of the absorption device is provided with a tray, and the lower part is provided with a packing;

Preferably, a waste gas inlet containing organic matter is provided on one side of the bottom of the absorption device;

Preferably, the first gas outlet is connected to the exhaust gas inlet containing organic matter;

Preferably, the first gas outlet is connected to one side of the bottom of the absorption device;

Preferably, the top of the absorption device is provided with a gas outlet containing organic matter;

Preferably, an absorbent inlet is provided on one side of the top of the absorption device;

Preferably, an absorbent outlet is provided at the bottom of the absorption device;

Preferably, the absorbent outlet is connected to a waste liquid treatment unit;

Preferably, an absorbent circulation inlet is provided on one side of the middle of the absorption device;

Preferably, the absorption unit further comprises an absorbent circulation pump connecting the absorbent outlet and the absorbent circulation inlet;

Preferably, a second heat exchange device is provided between the circulation pump and the absorbent circulation inlet.
The processing device according to any one of claims 1 to 4, wherein the condensing unit comprises a condensing device connected to an outlet of the organic-containing gas;

Preferably, the top of the condensation device is provided with a non-condensable gas outlet, and the bottom is provided with a condensed liquid outlet;

Preferably, the condensate outlet is connected to a waste liquid treatment unit;

Preferably, the non-condensable gas outlet is connected to the first gas inlet of the adsorption device;

Preferably, the condensation device is further provided with a condensation medium inlet and a condensation medium outlet.
The processing device according to any one of claims 1 to 5, wherein the adsorption device comprises at least two sets of adsorption towers arranged in parallel;

Preferably, the adsorption tower group includes at least one adsorption tower;

Preferably, an adsorbent is arranged in the adsorption tower;

Preferably, a first gas inlet is arranged at the bottom of the adsorption tower, and a second gas outlet is arranged at the top;

Preferably, the first gas outlet is connected to the first gas inlet;

Preferably, the second gas outlet is connected to the chimney;

Preferably, the adsorption-desorption unit further comprises a vacuum pump arranged between the adsorption device and the first heat exchange device;

Preferably, the lower part of the phase separation device is provided with a liquid phase outlet;

Preferably, the liquid phase outlet is connected to a waste liquid treatment unit;

Preferably, a liquid-liquid separation unit is provided before the waste liquid treatment unit;

Preferably, the liquid-liquid separation unit includes an oil-water separation device.
A method for treating organic-matter-containing waste gas, wherein the treatment method is performed using the treatment device for organic-matter-containing exhaust gas according to any one of claims 1 to 6 .
The processing method according to claim 7, comprising the steps of:

(1) The waste gas containing organic matter is sent to the absorption unit for absorption treatment, and the gas phase after absorption and the liquid phase of the absorbent are obtained;

(2) after the described absorption of step (1), the gas phase enters the condensation unit and undergoes the first condensation treatment to obtain non-condensable gas and condensate;

(3) After the non-condensable gas in step (2) enters the absorption unit from the first gas inlet for cyclic absorption or enters the adsorption device for cyclic adsorption, purified gas is obtained;

After the adsorption is saturated, the adsorption device is desorbed, and the desorbed gas is sent to the first heat exchange device for subsequent condensation treatment and gas-liquid separation. The first gas inlet of the device performs cyclic adsorption.
The treatment method according to claim 7 or 8, wherein the temperature of the waste gas containing organic matter in step (1) is ≤60°C.
The treatment method according to claim 8 or 9, wherein the pressure of the absorption treatment is 95 to 120 kPa.
The treatment method according to any one of claims 8 to 10, wherein the absorbent for the absorption treatment is desalinated water or an organic solvent;

Preferably, the feed mass ratio of the absorbent to the waste gas containing organic matter is 0.01-5kg:1m3;

Preferably, the absorbent liquid phase is discharged from the absorbent outlet;

Preferably, the liquid phase of the absorbent is circulated to the middle of the absorption device through the absorbent circulating pump;

Preferably, the circulating amount of the liquid phase of the absorbent accounts for 80-95 wt% of the total liquid phase of the outlet of the absorbent.
The treatment method according to any one of claims 8 to 11, wherein the temperature of the first condensation treatment in step (2) is -15 to 10°C;

Preferably, the condensate is sent to a waste liquid treatment unit for waste liquid treatment.
The treatment method according to any one of claims 8 to 12, wherein the adsorbent adsorbed in step (3) comprises any one or a combination of at least two of activated carbon, silica gel, molecular sieve or carbon fiber;

Preferably, at least one group of at least two parallel adsorption tower groups of the adsorption device performs adsorption operation;

Preferably, the desorption is vacuum desorption or steam desorption, preferably vacuum desorption;

Preferably, the pressure of the vacuum desorption is 1-30 kPa;

Preferably, the vacuum desorption is carried out in a protective atmosphere;

Preferably, the protective atmosphere includes a nitrogen atmosphere;

Preferably, the temperature of the second condensation treatment is -15-10°C.
The processing method according to any one of claims 7 to 13, comprising the steps of:

(1) The waste gas containing organic matter with a temperature of ≤60°C is sent to the absorption tower from the organic waste gas inlet, and the desalinated water enters the absorption tower from the absorbent inlet, and the waste gas containing organic matter is absorbed and treated, and the absorbed liquid phase of the absorbent flows from the absorption outlet. Discharge, 5-20wt% is sent to the waste liquid treatment unit for waste liquid treatment, 80-95wt% is sent to the middle of the absorption tower by the absorbent circulating pump for circulation; after absorption, the gas phase is discharged from the gas outlet containing organic matter;

Wherein, the feed mass ratio of the absorbent to the waste gas containing organic matter is 0.01-5kg:1m3;

(2) Step (1) after the absorption, the gas phase enters the condensing device and undergoes a first condensation treatment at -15 to 10 ° C to obtain non-condensable gas and condensed liquid; the condensed liquid is sent to the waste liquid treatment unit for waste liquid treatment ;

(3) The non-condensable gas described in step (2) enters the adsorption tower group for adsorption operation from the first gas inlet, and at least one group of the at least two groups of parallel adsorption tower groups performs adsorption operation to obtain purified gas;

After the adsorption is saturated, the adsorption device is desorbed by means of vacuum desorption, the pressure of vacuum desorption is 1-30 kPa, and the vacuum desorption is carried out in a nitrogen atmosphere;

The desorbed gas is sent to the first heat exchange device at -15 to 10°C after the second condensation treatment, and then enters the phase separation device for gas-liquid separation. Or return to the first gas inlet of the adsorption device for cyclic adsorption;

The liquid phase after the gas-liquid separation is sent to the waste liquid treatment unit for waste liquid treatment.