CN109499259A - A kind of packed tower and the method using packed tower improvement low-concentration organic exhaust gas - Google Patents
A kind of packed tower and the method using packed tower improvement low-concentration organic exhaust gas Download PDFInfo
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- CN109499259A CN109499259A CN201910026903.XA CN201910026903A CN109499259A CN 109499259 A CN109499259 A CN 109499259A CN 201910026903 A CN201910026903 A CN 201910026903A CN 109499259 A CN109499259 A CN 109499259A
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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
- B01D53/002—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 condensation
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- 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
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- Engineering & Computer Science (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention belongs to environment protection field, especially a kind of packed tower further relates to spray into the method that liquid nitrogen or liquid CO 2 administer low-concentration organic exhaust gas using packed tower.In order to solve problem above, the present invention provides a kind of packed towers, the shell side of the packed tower is followed successively by gas feed, cold liquid inlet from top to bottom, the other side is followed successively by liquid outlet, gas vent from top to bottom, filler is equipped in the shell, the shell is close to shell and is equipped with insulating layer.The method that liquid nitrogen or liquid CO 2 administer low-concentration organic exhaust gas is sprayed into using packed tower the present invention also provides a kind of.Low-concentration organic exhaust gas administering method provided by the invention has following the utility model has the advantages that a, realization tail gas high standard discharge；B, need to dispose the puzzlement of active carbon without activated carbon adsorption bring；C, other environmental risks caused by burning because of tail gas are avoided；D, the condensate liquid of organic solvent class tail gas is collected, is conducive to resource utilization.
Description
Technical field
The invention belongs to environment protection field, especially a kind of packed tower further relates to administer low-concentration organic exhaust gas using packed tower
Method.
Background technique
VOC(volatile organic compounds) to generally refer to saturated vapour pressure 20 DEG C higher for volatile organic matter
It is greater than or equal to 0.01KPa, the organic compound that boiling point is lower, molecular weight is small, volatile under normal temperature state down.
VOC feature is that boiling point is lower, molecular weight is small, volatile under normal temperature state, and main component is hydro carbons, halogenated hydrocarbons, nitrogen
Hydrocarbon, oxygen-containing hydrocarbon, sulphur hydrocarbon and low-boiling polycyclic aromatic hydrocarbon etc., end treatment technology are broadly divided into recovery processing and oxidation processes two
Major class.Recovery processing technology includes condensation, UF membrane, absorption, absorption etc..Oxidation processes VOC technology includes directly burning, heating power
The biodegradation techniques such as thermal oxidation techniques and biofiltration, bio-trickling and zinc cation such as burning and catalysis burning, low temperature
Plasma technique etc..
Directly burning is also referred to as direct flame combustion, is the processing mode by VOC component in exhaust gas as fuel, therefore the method
It is only applicable to VOC concentration or the higher exhaust gas of calorific value, ignition temperature is usually maintained in 1100 DEG C or so.It is organic for low concentration
Gas is not suitable for directly burning, and needs again to burn after being concentrated.Heating power can also be used for VOC concentration or the lower exhaust gas of calorific value
Burning is to handle.Production by Catalytic Combustion Process is to accelerate the chemical reaction velocity of VOC under the action of catalytic bed, make in exhaust gas
VOC, which is oxidized, resolves into CO2、H2O.Different from directly burning and flame combustion, catalytic surface is non-flaming combustion, and safety is good,
Only 200~450 DEG C of ignition temperature, auxiliary combustion consumption is few, requires low, combustion process to combustible component concentration in exhaust gas and calorific value
It is nearly free from NOX.
Plasma processing techniques are under the action of extra electric field, and what medium discharge generated largely takes energy electron bombardment pollution
Object molecule makes its ionization, dissociation and excitation, the gas molecule after electron collision form the particle with high activity, high
Active particle aoxidizes VOC molecule, degradation reaction, converts CO for hazardous contaminant2、H2The nontoxic object such as O
Matter.Just with Low Temperature Plasma Treating VOC gas, it is difficult to which processing is thoroughly and energy consumption is higher, its catabolite complicated component
It may cause secondary pollution problems.For these deficiencies, people begin to focus on low-temperature plasma synergistic catalysis, ultraviolet
The effect of the effects of solution, biodegrade and absorption, obtains comparatively ideal treatment effect.
In conclusion different processing techniques respectively have its advantage and disadvantage and applicability in the selection of VOC end treatment technology, answer
When the physics and chemical property according to VOC exhaust gas, it is useless to handle VOC to select the combination of different recovery method or several method
Gas.As can the organic solvent in recycling VOC exhaust gas, can not only mitigate environmental pollution, can also obtain certain economic benefit；It is right
In the higher VOC exhaust gas of concentration, first gas is pre-processed using absorption process, condensation method etc., then has by handling low concentration
The method of machine exhaust gas carries out subsequent processing, reduces secondary pollution while improving treatment effeciency.
Current condensation method processing tail gas generally go through tail gas and cooling medium heat exchange make in tail gas water and pollution because
Sub- condensation, since gas heat exchanger effectiveness is low, it is therefore desirable to which the heat exchanger of enough heat exchange areas is just able to achieve to gas
Effectively condensation；Water and pollution factor such as chlorine, sulfur dioxide, hydrogen chloride for carrying in tail gas etc. are easy to be condensed by heat exchanger surface
Water absorb, cause dew point corrosion, thus the material of tail gas condenser is required it is high, to overcome dew point corrosion to have to significantly
Increase equipment investment；For the deep condensation of Wind Volume, operation energy consumption is also the factor having to take into account that.
For low-concentration organic exhaust gas, the present inventor proposes a kind of new deep treatment method.
Summary of the invention
1, technical problem to be solved:
The various processing methods to volatile organic gases, it is all defective, high treating effect, at high cost, at low cost, processing
Effect is limited, while being unable to recycling to beneficiating ingredient in volatile organic gases.
2, technical solution:
In order to solve problem above, the present invention provides a kind of packed tower, on the shell of the packed tower, side is from top to bottom
It is followed successively by gas feed, cold liquid inlet, the other side is followed successively by liquid outlet, gas vent from top to bottom, sets in the shell
There is filler, the shell is close to shell and is equipped with insulating layer.
Partition is additionally provided in the shell, filler is divided into two parts up and down by the partition.
The material of the partition is permeable porous material.
The packed tower being capable of serial or parallel connection use.
The size of the packed tower is determined by air quantity, temperature, pollutant property and the content for needing to administer exhaust gas.
The present invention also provides a kind of methods for administering low-concentration organic exhaust gas using packed tower, comprising the following steps: the
One step: will be entered in packed tower by pipeline from gas feed after the waste liquid pre-cooling containing low-concentration organic, step 2: with pipe
Road is equipped with filling container step 3: entering out of cold liquid inlet introducing liquid nitrogen or liquid CO 2 lasting penetrating packed tower
Liquid nitrogen or liquid CO 2 meet room temperature or the higher organic exhaust gas of temperature after gasify immediately, and make the moisture content carried in exhaust gas
Or organic matter condensation or icing, the mixture of the water and organic matter that freeze by supercooling continue to make certainly with the exhaust gas contact newly entered
Cooling effect, liquid nitrogen or liquid CO 2 will be generated to exhaust gas while body heating liquefaction, and gas after heating is contacted with organic exhaust gas
Change, pass through gas vent together with tail gas up to standard and discharged through pipeline or air-introduced machine, step 4: the condensed water generated in third step from
Filler surface is trickled from top to bottom, and lower layer's filler is flowed into after partition, is connect in filler surface with the organic exhaust gas newly entered
Touching, enters bottom liquid collecting pit by liquid outlet after exhaust gas is pre-chilled.
Heat exchanger is arranged in the gas feed and gas outlet.
It is additionally provided with temperature sensor and PLC, the temperature sensor is arranged inside the shell, and the temperature sensor is adopted
The data of collection are sent to PLC, and PLC compares collected data and preset data, if temperature is higher than preset number
According to the inlet of increase liquid nitrogen or liquid CO 2 reduces liquid nitrogen or liquid titanium dioxide if temperature is lower than preset data
The inlet of carbon.
3, the utility model has the advantages that
Low-concentration organic exhaust gas deep treatment method provided by the invention has following the utility model has the advantages that a, realization tail gas high standard row
It puts；B, need to dispose the puzzlement of active carbon without activated carbon adsorption bring；C, other rings caused by burning because of tail gas are avoided
Border risk；D, the condensate liquid of organic solvent class tail gas is collected, is conducive to resource utilization.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that filler is equipped in the present invention.
Specific embodiment
Carrying out embodiment below by attached drawing, the present invention is described in detail.
As shown in Figure 1, the present invention provides a kind of packed tower, on the shell 1 of the packed tower side from top to bottom according to
Secondary is gas feed 4, cold liquid inlet 2, and the other side is followed successively by liquid outlet 5, gas vent 8 from top to bottom, in the shell 1
Equipped with filler 7, the shell 1 is close to shell 1 and is equipped with insulating layer 3.
Gas enters from gas feed 4, and liquid nitrogen or liquid CO 2 enter from liquid-inlet 2, gas by liquid nitrogen or
Liquid CO 2 is cooling, and by filler, the liquid nitrogen or liquid CO 2 of gas and gasification after improvement are from 8 row of gas vent
It removes, the water of condensation is excluded from liquid outlet.
Insulating layer 3 is set in the filler shell 1, the temperature in shell 1 is made to keep stablizing.
Filler is divided into two parts up and down by the partition 6, and partition 6 is manufactured using permeable porous material, it is ensured that uses wind
The case where machine is supplied gas leeward directly can cannot flow freely into lower layer by the liquid on upper layer.
Embodiment 1
Certain chemical plant technology waste gas adds up to 10240m3/ h absorbs chlorine, chlorophenol etc. in tail gas using circulation alkali liquor, to the greatest extent
Pipe uses level Four lye and absorbs, and exhaust emissions is still difficult to meet environmental requirements.
It is analyzed through site inspection, exhaust emissions temperature is higher, and temperature is 40 °C or so.After the absorption of level Four lye, tail
Air humidity degree is substantially at saturation state.The chlorinated phenol being dissolved in the water on a small quantity is legal after governance for reaching standard to be discharged from discharge outlet, this
A little chlorinated phenols with after exhaust emissions quickly condensation drop to on-site and near, then slow release causes into neighbouring air
The puzzlement that enterprise VOC is administered.
According to the method described in the present invention, manufacturing an inside dimension is that 2.2 meters long, 2.2 meters wide, 6 meters high condensations are inhaled
Tower is received, the tail gas after the absorption of level Four lye is introduced in absorption tower, and to liquid nitrogen is sprayed into tower, passes through the outlet of monitoring absorption tower
The straying quatity of exhaust emissions temperature adjustment liquid nitrogen makes tail gas from absorption tower outlet temperature be in -30 °C or so, maintains system operation, tower
Bottom condensate liquid secondary use after collecting.Phenolic material content is 13.5mg/m in tail gas after the absorption of level Four lye3, pass through processing
Discharge outlet phenolic material content is less than 2mg/m afterwards3。
Embodiment 2
30000m is added up to after certain pharmaceutical factory's Workshop Production gas sampling3/ h, gas VOCs after existing apparatus pre-processes contain
Amount is 110mg/m3, the method according to the invention, and manufacturing an inside dimension is 3.8 meters long, 3 meters wide, 9 meters high cold
Solidifying absorption tower, tail gas after processing is introduced in absorption tower, and to liquid CO 2 is sprayed into tower, by monitoring absorption tower
The straying quatity of outlet exhaust emissions temperature adjustment liquid CO 2 makes tail gas from absorption tower outlet temperature be in -10 °C, maintains system
System operation, tower bottom condensate liquid send sewage disposal system biochemical treatment after collecting.Discharge outlet VOCs content is 15mg/ after processing
m3。
Embodiment 3
Certain fine chemistry industry Workshop Production exhaust gas 15000m3/ h, VOCs content is 100mg/m3 after pretreatment, according to the present invention
The method, manufacturing an inside dimension is 2.5 meters long, 3 meters wide, 9 meters high of condensed absorbent towers, by tail after processing
Gas introduces in absorption tower, and to liquid CO 2 is sprayed into tower, exports exhaust emissions temperature by monitoring absorption tower and adjust liquid
The straying quatity of body carbon dioxide makes tail gas from absorption tower outlet temperature be in 0 °C, maintains system operation, tower bottom condensate liquid is after collecting
Send sewage disposal system biochemical treatment.Discharge outlet VOCs content is 25mg/m after processing3。
Although the present invention has been described by way of example and in terms of the preferred embodiments, they be not it is for the purpose of limiting the invention, it is any ripe
This those skilled in the art is practised, without departing from the spirit and scope of the invention, can make various changes or retouch from working as, therefore guarantor of the invention
Shield range should be subject to what claims hereof protection scope was defined.
Claims (8)
1. a kind of packed tower, on the shell (1) of the packed tower side be followed successively by from top to bottom gas feed (4), cold liquid into
Mouth (2), the other side are followed successively by liquid outlet (5), gas vent (8) from top to bottom, are equipped with filler (7) in the shell (1),
The shell (1) is close to shell (1) and is equipped with insulating layer (3).
2. packed tower as described in claim 1, it is characterised in that: it is additionally provided with partition (6) in the shell (1), it is described
Filler is divided into two parts up and down by partition (6).
3. packed tower as claimed in claim 2, it is characterised in that: the material of the partition (6) is permeable porous material.
4. the packed tower as described in claim 1-3 any claim, it is characterised in that: the packed tower can connect or
It is used in parallel.
5. the packed tower as described in claim 1-3 any claim, it is characterised in that: the size of the packed tower is by needing
Air quantity, temperature, pollutant property and the content for administering exhaust gas determine.
6. a kind of method that the packed tower using as described in claim 1-5 any claim administers low-concentration organic exhaust gas,
The following steps are included: step 1: being filled out being entered by pipeline from gas feed (4) after the exhaust gas pre-cooling containing low-concentration organic
Expect in tower, step 2: with pipeline out of cold liquid inlet (2) introducing liquid nitrogen or liquid CO 2 lasting penetrating packed tower, the
Three steps: entrance is equipped with after the liquid nitrogen or liquid CO 2 chance room temperature or the higher organic exhaust gas of temperature of filling container gas immediately
Change, and the moisture content carried in exhaust gas or organic matter is made to condense or freeze, the mixture of the water and organic matter that freeze by supercooling continues
With the exhaust gas contact newly entered, make that exhaust gas will be generated cooling effect, liquid nitrogen or liquid titanium dioxide while itself heating liquefaction
Carbon gasifies after contacting heating with organic exhaust gas, passes through gas vent (8) together with tail gas up to standard and discharges through pipeline or air-introduced machine, the
Four steps: the condensed water generated in third step trickles from top to bottom from filler surface, is flowed into lower layer's filler after partition (6),
It is contacted in filler surface with the organic exhaust gas newly entered, bottom liquid is entered by liquid outlet after exhaust gas is pre-chilled and is received
Ji Chi.
7. method as claimed in claim 6, it is characterised in that: be arranged at the gas feed (1) and gas vent (8) and change
Hot device.
8. method as claimed in claim 6, it is characterised in that: be additionally provided with temperature sensor and PLC, the temperature sensor
Inside the shell, the data of the temperature sensor acquisition are sent to PLC for setting, and PLC is by collected data and preset number
According to comparing, if temperature is higher than preset data, increase the inlet of liquid nitrogen or liquid CO 2, if temperature is lower than
Preset data reduce the inlet of liquid nitrogen or liquid CO 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910026903.XA CN109499259A (en) | 2019-01-11 | 2019-01-11 | A kind of packed tower and the method using packed tower improvement low-concentration organic exhaust gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910026903.XA CN109499259A (en) | 2019-01-11 | 2019-01-11 | A kind of packed tower and the method using packed tower improvement low-concentration organic exhaust gas |
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| CN109499259A true CN109499259A (en) | 2019-03-22 |
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| CN201910026903.XA Pending CN109499259A (en) | 2019-01-11 | 2019-01-11 | A kind of packed tower and the method using packed tower improvement low-concentration organic exhaust gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111473353A (en) * | 2020-04-14 | 2020-07-31 | 长沙有色冶金设计研究院有限公司 | Quenching arsenic removal technology for smelting flue gas |
| CN112107956A (en) * | 2019-06-19 | 2020-12-22 | 中国石油化工股份有限公司 | Mobile liquid nitrogen sprayer and deep thermal desorption recovery system for adsorbent |
| CN112516748A (en) * | 2020-11-10 | 2021-03-19 | 华南理工大学 | Liquid carbon dioxide spray type pressure-variable temperature-control adsorption tower |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112107956A (en) * | 2019-06-19 | 2020-12-22 | 中国石油化工股份有限公司 | Mobile liquid nitrogen sprayer and deep thermal desorption recovery system for adsorbent |
| CN111473353A (en) * | 2020-04-14 | 2020-07-31 | 长沙有色冶金设计研究院有限公司 | Quenching arsenic removal technology for smelting flue gas |
| CN112516748A (en) * | 2020-11-10 | 2021-03-19 | 华南理工大学 | Liquid carbon dioxide spray type pressure-variable temperature-control adsorption tower |
| CN112516748B (en) * | 2020-11-10 | 2021-10-26 | 华南理工大学 | Liquid carbon dioxide spray type pressure-variable temperature-control adsorption tower |
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Application publication date: 20190322 |