CN104056530A - Contaminated soil thermal decomposition tail gas treatment method - Google Patents

Contaminated soil thermal decomposition tail gas treatment method Download PDF

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Publication number
CN104056530A
CN104056530A CN201410307638.XA CN201410307638A CN104056530A CN 104056530 A CN104056530 A CN 104056530A CN 201410307638 A CN201410307638 A CN 201410307638A CN 104056530 A CN104056530 A CN 104056530A
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China
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tail gas
contaminated soil
analysed
catalytic combustion
exhaust gas
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CN201410307638.XA
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Chinese (zh)
Inventor
朱延臣
李春萍
杨飞华
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北京建筑材料科学研究总院有限公司
北京金隅股份有限公司
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Priority to CN201410307638.XA priority Critical patent/CN104056530A/en
Publication of CN104056530A publication Critical patent/CN104056530A/en

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Abstract

The invention discloses a contaminated soil thermal decomposition tail gas treatment method. The contaminated soil thermal decomposition tail gas treatment method comprises the steps of dust removal treatment, catalytic combustion, cooling treatment and absorption treatment, wherein according to the catalytic combustion, tail gas without particles is fed into a catalytic combustion chamber to be subjected to catalytic combustion, the combustion process is a process with catalytic combustion through catalysts, the temperature of catalytic combustion ranges from 200 DEG C to 600 DEG C, and the time of catalytic combustion is two seconds or longer. Compared with an existing tail gas high-temperature incineration method, the contaminated soil thermal decomposition tail gas treatment method has the advantages that due to the fact that the tail gas is treated with a catalytic combustion method, the damage and removal rate of organic pollutants is more than 99%, and the tail gas is treated efficiently, safely and effectively; due to the fact that tail gas treatment is carried out at low temperature, energy consumed in the tail gas treatment process is about only half of the energy consumed in high-temperature incineration, the treatment cost of thermal decomposition is remarkably reduced, and the contaminated soil thermal decomposition technology can be widely applied easily.

Description

Exhaust gas treating method is analysed in a kind of contaminated soil pyrolysis

Technical field

The present invention relates to contaminated soil recovery technique field, specifically, relate to a kind of contaminated soil pyrolysis and analyse exhaust gas treating method.

Background technology

Pyrolysis is analysed as a kind of contaminated soil recovery technique, because of its validity that organic material contaminated soil is administered, is developed faster in recent years, and developed country has obtained application abroad at present, and China has also had some pyrolysis to analyse the report of technology and equipment.

Pyrolysis is analysed and is referred to by contaminated soil heating, and make contaminated soil be warming up to sufficient temp, pollutant volatilizees, separates from soil, and soil is purified.The improvement that is suitable for volatility or semi-volatile organic matter contaminated soil is analysed in pyrolysis, has that treatment effeciency is high, features such as soil can utilize after non-secondary pollution, reparation, but also exists the problem that energy consumption is high, processing cost is large.Generally, pyrolysis is analysed technique and can be divided into two stages: one is the hot resolution phase of contaminated soil; Two is the vent gas treatment stage, wherein the energy consumption in vent gas treatment stage is about pyrolysis and analyses the more than 60% of technique total energy consumption, this is because common contaminated soil pyrolysis is analysed at 400-600 DEG C to carry out, tail gas need to adopt the method processing of burning at higher temperature: direct heat analyzing device (CN101712042A) has been announced a kind of contaminated soil direct heat resolver, its tail gas is processed in afterburner, and temperature reaches 1200 DEG C of left and right; The thermal desorption method (CN102218446A) of Polluted Soil has been announced a kind of pyrolysis of Polluted Soil and has been analysed (thermal desorption) method, adopts the flue gas of incinerating method pack processing containing gasification pollutant, and its incineration temperature is 750-1200 DEG C, is preferably 750-950 DEG C.At present, because the high problem of vent gas treatment energy consumption of existence is analysed in pyrolysis, its application is limited by very large, therefore how reducing pyrolysis, to analyse the energy consumption of vent gas treatment be the problem that the hot analytic technique of current contaminated soil is needed solution badly.

Summary of the invention

The object of the present invention is to provide a kind of contaminated soil pyrolysis to analyse exhaust gas treating method, is that particle and pollutant in the raw tail gas of contaminated soil pyrolysis division are removed respectively, and tail gas is purified.

To achieve these goals, technical scheme of the present invention is: exhaust gas treating method is analysed in a kind of contaminated soil pyrolysis, be that hot parser gaseous phase outlet discharge tail gas is processed and reached discharge standard, described method comprises: dust removal process, catalytic combustion, cooling processing and absorption processing, wherein:

Described dust removal process: will discharge tail gas from hot parser gaseous phase outlet and remove degranulation through filter bag;

Described catalytic combustion: carry out catalytic combustion by sending into catalytic combustor except the tail gas of degranulation, the process of burning is that catalytic combustion temperature is 200-600 DEG C with the process of catalyst burning, and the catalytic combustion time is more than 2 seconds;

Described cooling processing: be cooled to below 100 DEG C sending into cooling tower from catalytic combustor tail gas out;

Described absorption processing: will send into absorption tower from the cooling tower tail gas lower than 100 DEG C out, wash the pollutant such as SO2, NOx of removing in tail gas by absorption liquid, reach discharge standard.

Scheme is further: described dust removal process is carried out in cyclone dust collectors or sack cleaner, and dust removal process mode is bi-level treatment, and the first order is for coarseparticulates more than particle diameter 50 μ m, and the second level is following for particle diameter 50 μ m, more than 5 μ m fine particle.

Scheme is further: described catalyst is a kind of metal oxide supporting catalyst, is made up of the composite oxides of one or more elements in carrier and manganese oxide and Ce, Zr, Ti, Co, Fe, Cu; Catalyst disperses to be fixed on the indoor reaction bed of catalytic combustion, in catalyticing combustion process, passes into air by air blast, ensures that by online oxygen detection controller in tail gas, oxygen content is not less than 8%.

Scheme is further: the absorption liquid that described absorption tower is used is that concentration is 30% NaOH solution.

Scheme is further: described reaction bed is arranged as 2-5 layer in catalytic combustor, is provided with between layers spacing, and interlamellar spacing equates.

Scheme is further: described carrier is mesopore molecular sieve, and described composite oxides are manganese oxide and Ce, and content is respectively 65% and 35%.

Scheme is further: described carrier is mesopore molecular sieve, and described composite oxides are manganese oxide and Ti, and content is respectively 76% and 24%.

Scheme is further: described carrier is mesopore molecular sieve, and described composite oxides are manganese oxide and Co, and content is respectively 68% and 32%.

Scheme is further: described carrier is mesopore molecular sieve, and described composite oxides are manganese oxide and Ce and Zr, and content is respectively 48%, 26%, 26%.

Scheme is further: described carrier is mesopore molecular sieve, and described composite oxides are manganese oxide and Ce, Zr, Ti, Co, and content is respectively 42%, 20%, 15%, 8%, 15%.

The present invention, compared with existing tail gas high temperature incineration method, has following characteristics:

(1) adopt the method for catalytic combustion to process tail gas, the destruction clearance of organic pollution exceedes 99%, has realized efficiently, the safely and effectively processing of tail gas.

(2) vent gas treatment is carried out at a lower temperature, and vent gas treatment energy consumption is only the half left and right of high temperature incineration, has significantly reduced the processing cost that pyrolysis is analysed, and is conducive to the extensive use of the hot analytic technique of contaminated soil.

Below in conjunction with embodiment, the present invention is described in detail.

Detailed description of the invention

Embodiment 1:

Exhaust gas treating method is analysed in a kind of contaminated soil pyrolysis, hot parser gaseous phase outlet to be discharged to tail gas process, particle and pollutant in the raw tail gas of contaminated soil pyrolysis division are removed respectively, tail gas is purified and reaches discharge standard, described method comprises: dust removal process, catalytic combustion, cooling processing and absorption processing, wherein:

Described dust removal process: will discharge tail gas from hot parser gaseous phase outlet and remove degranulation through filter bag; In order effectively to remove particle, contaminated soil is after pyrolysis is analysed, organic pollution in soil is resolved out, the dust producing with hot resolving forms the flue gas with particle, first carries out dust removal process, and flue gas ash removal is processed and carried out in cyclone dust collectors or sack cleaner, dust removal process mode is bi-level treatment, the first order is for coarseparticulates more than particle diameter 50 μ m, and the second level is for the fine particle below particle diameter 50 μ m, more than 5 μ m, and total efficiency of dust collection reaches more than 98%.In the time using cyclone dust collectors, two cyclone dust collectors series connection are used, and realize bi-level treatment by adjusting wind speed.First use the filter bag of aperture 50 μ m to remove coarseparticulate when using when sack cleaner, being respectively, and the filter bag of use aperture 5 μ m is afterwards removed fine particle.

Described catalytic combustion: contaminated soil pyrolysis is analysed tail gas and contained a large amount of organic pollutions, as benzene homologues, polycyclic aromatic hydrocarbon with containing chlorinatedorganic etc., and the temperature of tail gas is below 600 DEG C; Carry out catalytic combustion by sending into catalytic combustor except the tail gas of degranulation, the process of burning is that catalytic combustion temperature is 200-600 DEG C with the process of catalyst burning, and the catalytic combustion time is more than 2 seconds; Described catalyst is a kind of metal oxide supporting catalyst, is made up of the composite oxides of one or more elements in carrier and manganese oxide and Ce, Zr, Ti, Co, Fe, Cu; Catalyst disperses to be fixed on the indoor reaction bed of catalytic combustion, in catalyticing combustion process, passes into air by air blast, and being not less than 8%(optimum by oxygen content in online oxygen detection controller guarantee tail gas is 10%).In catalyticing combustion process, pass into air, ensure the certain oxygen content in tail gas, so both can make catalytic combustion carry out under efficient, can suppress again the generation of catalyticing combustion process bioxin.After catalytic combustion is processed, in tail gas, the destruction clearance of organic pollution can be more than 99%.

Described cooling processing: tail gas is after catalytic combustion is processed, and organic pollution is removed, the temperature of tail gas, at 200-600 DEG C, in order to reclaim heat and to be convenient to subsequent treatment, need to be carried out cooling processing.Be cooled to below 100 DEG C (for example, until environment temperature, or 40 DEG C to 80 DEG C) by send into cooling tower from catalytic combustor tail gas out; Tail gas enters from cooling tower bottom, discharges from top, and cooling tower top surrounding is installed some shower nozzles, and by reducing exhaust temperature to cooling tower spray water mist, the hot water of formation is for generating.

Described absorption processing: tail gas, after cooling processing, still contains SO 2, the pollutant such as NOx, need to absorb processing.By sending into absorption tower from the cooling tower tail gas lower than 100 DEG C out, wash the SO removing in tail gas by absorption liquid 2, the pollutant such as NOx, reach discharge standard by smoke stack emission; The absorption liquid that described absorption tower is used is NaOH solution.Between absorption tower and chimney, blower fan is installed, by blower fan draw wind effect, entered by bottom, absorption tower from cooling tower tail gas out, discharge on top, top, absorption tower surrounding is installed some shower nozzles, by the inner spray-absorption liquid to absorption tower, the SO in trapping tail gas 2, the pollutant such as NOx, the absorption liquid that spray forms turns back to absorption tower by the circulating pump outside absorption tower again and sprays, like this through after spray repeatedly, absorption liquid pH reaches after neutral discharges by bottom, absorption tower floss hole.Described absorption liquid is that concentration is 30% NaOH solution.

Embodiment 2:

The present embodiment is the preferred version of embodiment 1, the content that therefore content of embodiment 1 should not represent as the present embodiment yet.

In the present embodiment, in described catalyticing combustion process, according to the kind of organic pollution in tail gas and content thereof, catalytic combustion temperature can be controlled at respectively under the condition of 200 DEG C, 300 DEG C, 400 DEG C, 500 DEG C, 600 DEG C and move, the time of operation, according to the suitable prolongation of temperature or shortening, but must be to ensure more than 2 seconds.

In embodiment, in the composite oxides of one or more elements in described carrier and manganese oxide and Ce, Zr, Ti, Co, Fe, Cu: described carrier is mesopore molecular sieve, the composite oxides of one or more elements in described manganese oxide and Ce, Zr, Ti, Co, Fe, Cu are respectively: manganese oxide and Ce, and content is respectively 65% and 35% of total amount; Manganese oxide and Ti, content is respectively 76% and 24% of total amount; Manganese oxide and Co, content is respectively 68% and 32% of total amount; Manganese oxide and Ce and Zr, content is respectively 48%, 26% and 26% of total amount; Manganese oxide and Ce, Zr, Ti, Co, content is respectively 42%, 20%, 15%, 8% and 15% of total amount; Manganese oxide and Ce, Zr, Ti, Co, Fe, Cu, content is respectively 42%, 10%, 11%, 13%, 10%, 8% and 6% of total amount.

In embodiment, described reaction bed can be arranged as 2-5 layer according to the height of catalytic combustor, is provided with between layers spacing, and interlamellar spacing equates.

Mesopore molecular sieve is wherein first successfully to be synthesized by Mobil company of the U.S. for 1992, and its aperture is between 1. 5~10nm, and duct one dimension is even, is six side's ordered arrangements, has very large surface area (700m 2more than/g).

Claims (10)

1. an exhaust gas treating method is analysed in contaminated soil pyrolysis, is hot parser gaseous phase outlet discharge tail gas is processed and reached discharge standard, and described method comprises: dust removal process, catalytic combustion, cooling processing and absorption processing, is characterized in that:
Described dust removal process: will discharge tail gas from hot parser gaseous phase outlet and remove degranulation through filter bag;
Described catalytic combustion: carry out catalytic combustion by sending into catalytic combustor except the tail gas of degranulation, the process of burning is that catalytic combustion temperature is 200-600 DEG C with the process of catalyst burning, and the catalytic combustion time is more than 2 seconds;
Described cooling processing: be cooled to below 100 DEG C sending into cooling tower from catalytic combustor tail gas out;
Described absorption processing: by sending into absorption tower from the cooling tower tail gas lower than 100 DEG C out, wash the SO removing in tail gas by absorption liquid 2, the pollutant such as NOx, reach discharge standard.
2. exhaust gas treating method is analysed in a kind of contaminated soil pyrolysis according to claim 1, it is characterized in that, described dust removal process is carried out in cyclone dust collectors or sack cleaner, dust removal process mode is bi-level treatment, the first order is for coarseparticulates more than particle diameter 50 μ m, and the second level is for the fine particle below particle diameter 50 μ m, more than 5 μ m.
3. exhaust gas treating method is analysed in a kind of contaminated soil pyrolysis according to claim 2, it is characterized in that, described catalyst is a kind of metal oxide supporting catalyst, is made up of the composite oxides of one or more elements in carrier and manganese oxide and Ce, Zr, Ti, Co, Fe, Cu; Catalyst disperses to be fixed on the indoor reaction bed of catalytic combustion, in catalyticing combustion process, passes into air by air blast, ensures that by online oxygen detection controller in tail gas, oxygen content is not less than 8%.
4. exhaust gas treating method is analysed in a kind of contaminated soil pyrolysis according to claim 3, it is characterized in that, the absorption liquid that described absorption tower is used is that concentration is 30% NaOH solution.
5. exhaust gas treating method is analysed in a kind of contaminated soil pyrolysis according to claim 3, it is characterized in that, described reaction bed is arranged as 2-5 layer in catalytic combustor, is provided with between layers spacing, and interlamellar spacing equates.
6. exhaust gas treating method is analysed in a kind of contaminated soil pyrolysis according to claim 3, it is characterized in that, described carrier is mesopore molecular sieve, and described composite oxides are manganese oxide and Ce, and content is respectively 65% and 35%.
7. exhaust gas treating method is analysed in a kind of contaminated soil pyrolysis according to claim 3, it is characterized in that, described carrier is mesopore molecular sieve, and described composite oxides are manganese oxide and Ti, and content is respectively 76% and 24%.
8. exhaust gas treating method is analysed in a kind of contaminated soil pyrolysis according to claim 3, it is characterized in that, described carrier is mesopore molecular sieve, and described composite oxides are manganese oxide and Co, and content is respectively 68% and 32%.
9. exhaust gas treating method is analysed in a kind of contaminated soil pyrolysis according to claim 3, it is characterized in that, described carrier is mesopore molecular sieve, and described composite oxides are manganese oxide and Ce and Zr, and content is respectively 48%, 26%, 26%.
10. exhaust gas treating method is analysed in a kind of contaminated soil pyrolysis according to claim 3, it is characterized in that, described carrier is mesopore molecular sieve, and described composite oxides are manganese oxide and Ce, Zr, Ti, Co, and content is respectively 42%, 20%, 15%, 8%, 15%.
CN201410307638.XA 2014-07-01 2014-07-01 Contaminated soil thermal decomposition tail gas treatment method CN104056530A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105964671A (en) * 2016-06-01 2016-09-28 中石化炼化工程(集团)股份有限公司 Remediation method for organic contaminated soil and treatment method for generated tail gas
CN106077066A (en) * 2015-11-24 2016-11-09 江苏安琪尔废气净化有限公司 The system and method for flow-type energy-conservation LTTD RCO renovation of organic pollution soil

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Publication number Priority date Publication date Assignee Title
CN106077066A (en) * 2015-11-24 2016-11-09 江苏安琪尔废气净化有限公司 The system and method for flow-type energy-conservation LTTD RCO renovation of organic pollution soil
CN105964671A (en) * 2016-06-01 2016-09-28 中石化炼化工程(集团)股份有限公司 Remediation method for organic contaminated soil and treatment method for generated tail gas

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Application publication date: 20140924