CN106621791A - Method and device for treating high-concentration foul gas produced by sludge thermal-hydrolysis - Google Patents
Method and device for treating high-concentration foul gas produced by sludge thermal-hydrolysis Download PDFInfo
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- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/84—Biological processes
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/52—Hydrogen sulfide
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/58—Ammonia
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
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- B01D53/34—Chemical or biological purification of waste gases
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- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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- B01D2258/00—Sources of waste gases
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- B01D2258/0283—Flue gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
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Abstract
The invention discloses a method and a device for treating high-concentration foul gas produced by sludge thermal-hydrolysis. The method comprises the following steps: S1, washing and heat-exchanging of thermal-hydrolyzed foul gas: a step of cooling thermal-hydrolyzed pressure-relieved foul gas, removing water vapor and sludge entrained in the thermal-hydrolyzed foul gas, and removing a part of foul substances in the foul gas; S2, deodorization by incineration: a step of removing the foul gas through a manner of incineration; S3, deodorization by chemical washing: a step of removing sulfur oxides and a small amount of incompletely-combusted hydrogen sulfide in flue gas through chemical washing; and S4, biological deodorization: a step of treating the foul gas by utilizing microorganisms, and transforming the foul gas into inorganic substances so as to achieve foul gas emission standards. The device is used for implementing the above-mentioned method. The method and the device provided by the invention have the advantages of simple principle, easy realization, good treatment effect, etc.
Description
Technical field
Present invention relates generally to technical field of sludge treatment, refers in particular to the high concentration effluvium that a kind of sludge pyrohydrolysis is produced
The method and apparatus of body process.
Background technology
According to《National environmental protection " 12 " is planned》And《" 12 " whole nation urban wastewater treatment and regeneration set
Apply construction plan》Requirement, by 2015, sewage treatment facility rate of load condensate brought up to more than 80%, and treatment rate of domestic sewage reaches
To 85%；When the time comes, the sewage disposal scale of China is up to 208,050,000 m3/d.According to house town and country construction portion with regard to national city
The town sewage treatment facility first quarter in 2016 builds the circular with ruuning situation：By in by the end of March, 2016, the whole nation sets city city
City, county add up to build up urban wastewater treatment firm 3910, and sewage treatment capacity is 1.67 hundred million m3/d；The sludge supervened (contains
Water rate is in terms of 80%) nearly 50,000,000 t/a or so (every ten thousand m3Sewage produces 5～10t of mud).And, the numeral also with 10%～
15% speed increases.
The sewage disposal cause of China in the past few decades, has there is breakthrough progress.Yet with China
There is serious " the light mud of heavy water " phenomenon in construction of wastewater treatment plant, cause a large amount of sludge " overstocked ", not obtain the place of reasonable benefit/risk
Reason is disposed.Accordingly, with respect to more ripe sewage disposal technology, specific resistance to filtration technology is in China still in starting
Stage, and slower development.According to《" 12 " whole nation urban wastewater treatment and the planning of regeneration Facilities Construction》：To 2015
Year, the sewage sludge harmlessness of municipality directly under the Central Government, provincial capital and cities specifically designated in the state plan processes disposal rate and reaches 80%, and other the planned cities reach
70%, county town and emphasis town reach 30%.But by the end of the year in 2014, national specific resistance to filtration Facilities Construction was only completed " ten
Two or five " the 43.4% of the object of planning, i.e., 224.81 ten thousand ton/year, breach is huge.
Anaerobic digestion is widely used as one of Treatment of Sludge important technology in American-European countries, is also encouraged energetically by China
Development.But so far, China's only more than 50 family's Sewage Plants have anaerobic sludge digestion equipment, and 40% or so stops transport.National Jing
The sludge of Anaerobic Treatment is crossed less than 2%.It main reason is that China's sludge generally existing sand content height, the content of organic matter are low
Problem, causes that anaerobic digestion operational efficiency is poor, and gas production is low.Pyrohydrolysis can have as a kind of emerging sludge pre-treatment techniques
Microorganism structure in effect destruction sludge, discharges the water and organic matter of microorganism and extracellular polymeric in sludge, and will be difficult to give birth to
The larger molecular organicses of thing degraded are hydrolyzed to the small organic molecule of easily biological-degradable, so as to improve digestion and the dehydration property of sludge
Energy.
Existing traditional pyrohydrolysis processing mode is " catalytic oxidation desulfurization+chemistry alkali cleaning+biological deodorizing ", and its equipment includes
Catalytic oxidation desulfurization tower, chemical caustic wash tower, biological deodorizing case, blower fan, humidification pump and plus wet tank.But traditional handicraft and equipment are present
Following defect：
1st, in foul smell hydrogen sulfide, sulfurous organic compound are easily caused catalyst inactivation in existing method, under causing treatment effeciency
Drop, the catalyst change frequency is improved and also results in operating cost raising.
2nd, the set odor removal is not provided with foul smell cooling system, and high temperature foul smell is easily caused microorganism in biological deodorizing system and loses
It is living.
3rd, the organic odor gas concentration such as methyl mercaptan, methyl sulfide and trimethylamine height and foul smell olfact pole in pyrohydrolysis foul smell
Low, the method is relatively low to organic matter foul gas removal efficiency, it is impossible to ensure pyrohydrolysis, especially high-temperature-hot-water is taken off at foul smell
Reason qualified discharge.
The content of the invention
The technical problem to be solved in the present invention is that：For the technical problem that prior art is present, the present invention provides one
Plant simple principle, easy realization, the method and apparatus of the high concentration foul gas process of the sludge pyrohydrolysis generation of high treating effect.
To solve above-mentioned technical problem, the present invention is employed the following technical solutions：
The method that the high concentration foul gas that a kind of sludge pyrohydrolysis is produced is processed, step is：
S1：Pyrohydrolysis foul smell is washed and exchanged heat；The foul smell of pyrohydrolysis release of pressure is lowered the temperature, removes what is carried secretly in pyrohydrolysis foul smell
Vapor and sludge, and remove part odorant in foul smell；
S2：Burn deodorant；Foul smell is removed by way of burning；
S3：Chemical washing is deodorant；The oxysulfide and imperfect combustion a small amount of sulphur in flue gas is removed by chemical washing
Change hydrogen；
S4：Biological deodorizing；Foul smell is processed using microorganism, is translated into inorganic matter, last foul smell row up to standard
Put.
As the further improvement of the inventive method：High-temperature-hot-water solution foul smell is reduced to into 20～40 in step S1
℃。
As a further improvement on the present invention：With natural gas or biogas as fuel in step S2, removed by burning
Hydrogen sulfide and organic odor gas in pyrohydrolysis.
As the further improvement of the inventive method：The ignition temperature is 600～1100 DEG C, or 850～1000 DEG C.
As the further improvement of the inventive method：In the step S3 detergent be NaOH, configuration pH value of solution=
13～14.
As the further improvement of the inventive method：In the step S4 microorganism be sulfur oxidizing bacterium group, nitrifying bacteria community or
One or more in denitrification flora.
The present invention further provides the device that the high concentration foul gas that a kind of sludge pyrohydrolysis is produced is processed, including
Washing heat exchange unit, is lowered the temperature the foul smell of pyrohydrolysis release of pressure by heat exchanger and washing tank, removes pyrohydrolysis foul smell
The vapor and sludge of middle entrainment, and remove part odorant in foul smell；
Deodorization unit is burned, with natural gas as fuel, the foul gas in foul smell is passed through into burning conversion；
Chemical scrubber, is connected with washing heat exchange unit and the output end for burning deodorization unit, is removed by chemical washing
Foul smell；
Biological deodorizing unit, is connected with the output end of chemical scrubber, and odorant is degraded to into dioxy by microorganism
Change carbon and water, the biological deodorizing unit output end is discharged.
As the further improvement of apparatus of the present invention：The tail end of the washing heat exchange unit passes through a foul smell flue gas heat-exchange unit
Deodorization unit is burned in connection, a flue gas fast cooling device is arranged between the chemical scrubber and burning deodorization unit, to cool down
The flue gas that incinerator is discharged.
As the further improvement of apparatus of the present invention：The chemical scrubber is connected with cleaning solution automatic liquid-feeding equipment, institute
Stating cleaning solution automatic liquid-feeding equipment includes connected cleaning solution chemicals dosing plant, cleaning solution circulating box and graphite heat exchanger, described to wash
Washing liquid chemicals dosing plant and cleaning solution circulating box is used for cleaning solution automatic feeding, conveying, and the graphite heat exchanger is used for cleaning solution
Cooling.
As the further improvement of apparatus of the present invention：It is provided between the biological deodorizing unit and chemical scrubber board-like
Heat exchanger, to cool down the flue gas Jing after chemical scrubber process.
Compared with prior art, it is an advantage of the current invention that：
1st, the method and device that the high concentration foul gas that sludge pyrohydrolysis of the present invention is produced is processed, burns foul smell is direct-fired
This process equipment application is burnt to sludge pyrohydrolysis odor treatment field, and define that " cooling+burning+reducing temperature twice+chemistry is washed
Wash+biological deodorizing " set of process equipment, it is high containing wet, high temperature, foul smell tolerance and fluctuation of concentration be big, component is multiple for processing
Miscellaneous foul gas has remarkable result, and the set process equipment can also be used for the high concentration of other field, the process of high humility foul smell.
2nd, the method and device that the high concentration foul gas that sludge pyrohydrolysis of the present invention is produced is processed, successfully solves sludge
High temperature, high concentration, the difficult problem for the foul gas process of complicated components produced in pyrohydrolysis process.After testing, pyrohydrolysis is produced
110～150 DEG C of foul smell temperature, odor concentration about 1,730,000, hydrogen sulfide is about 15000mg/m3, 1700～2000mg/ of methyl mercaptan
m3, methyl sulfide about 1000mg/m3, trimethylamine about 100mg/m3Deng, foul smell composition include hydrogen sulfide, ammonia, methyl mercaptan, methyl sulfide, two
First disulfide, carbon disulfide etc., detect after process to aiutage and factory circle, and every pollutant index meets《Odor pollution
Thing discharge standard》Emission limit and factory circle are primary standard requirement, dioxy when aiutage is highly 15 meters in GB14554-1993
Change sulphur and discharged nitrous oxides meet《Atmosphere pollution comprehensive discharge standard》(GB16297-1996) aiutage is highly 15 meters in
When corresponding primary standard.
Description of the drawings
Fig. 1 is the schematic flow sheet of the inventive method.
Fig. 2 is the principle schematic diagram. of apparatus of the present invention.
Marginal data：
1st, deodorization unit is burned；2nd, heat exchange unit is washed；3rd, deodorant blower fan；4th, foul smell flue gas heat-exchange unit；5th, flue gas chilling
Equipment；6th, chemical scrubber；7th, cleaning solution chemicals dosing plant；8th, cleaning solution circulating box；9th, plate type heat exchanger；10th, graphite heat exchanger；
11st, centrifugal blower；12nd, biological deodorizing device；13rd, aiutage.
Specific embodiment
The present invention is described in further details below with reference to Figure of description and specific embodiment.
As shown in figure 1, the method that the high concentration foul gas that the sludge pyrohydrolysis of the present invention is produced is processed, its step is：
S1:Pyrohydrolysis foul smell is washed and exchanged heat；Will pyrohydrolysis release of pressure foul smell cooling, remove pyrohydrolysis foul smell in carry secretly
Vapor and sludge, and remove part odorant in foul smell.
In concrete application example, high-temperature-hot-water solution foul smell (typically up to 180 DEG C) is reduced to by washing and cooling
20～40 DEG C, and remove the sludge and vapor carried secretly in foul smell.By cooling, the present invention can be by part malodorant in pyrohydrolysis
From gas phase conversion to liquid phase, clearance is about 20% to matter.Heat transmission equipment can be selected as board-like according to actual needs in the step
Heat exchanger or other kinds of heat exchanger.
S2:Burn deodorant；Foul smell is removed by way of burning；I.e. with natural gas as fuel, the sulfur-bearing in foul smell is had
The foul gas such as machine thing, hydrogen sulfide, trimethylamine, benezene material are converted into oxysulfide, carbon dioxide and vapor.
In concrete application example, fuel used can use the biogas that anaerobic sludge digestion is produced.Such as, with natural gas
Or biogas is fuel, burning removes hydrogen sulfide and organic odor gas in pyrohydrolysis, and ignition temperature is 600～1100 DEG C, preferably
For 850～1000 DEG C, foul smell is first exchanged heat into before incinerator with incinerator smoke, is burnt into incinerator afterwards,
Foul smell is substantially transitioned to oxysulfide, carbon dioxide, water and a small amount of nitrogen oxides after burning.The step foul smell clearance
99.9%.
In concrete application, exiting flue gas can be made to be exchanged heat with import foul smell, raising intake air temperature, reducing energy consumption,
Exit gas temperature is reduced simultaneously, reduces follow-up cooling energy consumption.
S3:Chemical washing is deodorant；Oxysulfide in flue gas and imperfect combustion a small amount of is removed by chemical washing
Hydrogen sulfide.
In concrete application example, the detergent for adopting can be selected for NaOH, configure pH value of solution=13～14.
Such as, the odorant such as sulfureous in flue gas oxide and unburned a small amount of hydrogen sulfide is removed by alkali liquid washing, the device is to sulphur oxygen
Compound clearance, more than 90%, is 80～85% to hydrogen sulfide removal rate.
S4:Biological deodorizing；
Using microorganism to the oxysulfide in foul smell, nitrogen oxides, unburned completely a small amount of hydrogen sulfide and organic evil
Odour is processed, and is translated into the inorganic matters such as carbon dioxide, water, sulfate radical, nitrate anion, and the step is to air inlet clearance
More than 90%, last foul smell qualified discharge.
In concrete application example, described microorganism is sulfur oxidizing bacterium group, nitrifying bacteria community and denitrification flora.
As shown in Fig. 2 invention further provides what the high concentration foul gas that a kind of sludge pyrohydrolysis is produced was processed
Device, including：
Washing heat exchange unit 2, is lowered the temperature the foul smell of pyrohydrolysis release of pressure by heat exchanger and washing tank, removes pyrohydrolysis foul smell
The vapor and sludge of middle entrainment, and remove part odorant in foul smell.
Deodorization unit 1 is burned, with natural gas as fuel, by the sulfurous organic compound in foul smell, hydrogen sulfide, trimethylamine, benzene class
The foul gas such as material are converted into oxysulfide, carbon dioxide and vapor.
Chemical scrubber 6, the oxysulfide and imperfect combustion a small amount of hydrogen sulfide in flue gas is removed by chemical washing.
Biological deodorizing unit 12, using microorganism the odorant that CIU and chemical washing are not removed completely is removed,
Odorant is degraded to by carbon dioxide and water, last qualified discharge by microorganism.
In concrete application example, burning is connected by a foul smell flue gas heat-exchange unit 4 in the tail end of washing heat exchange unit 2 and is removed
Smelly unit 1.
In concrete application example, a flue gas fast cooling device 5 is set between chemical scrubber 6 and burning deodorization unit 1,
To the flue gas for cooling down incinerator discharge.
In concrete application example, chemical scrubber 6 is connected with cleaning solution automatic liquid-feeding equipment, the cleaning solution automatic liquid-feeding
Equipment includes connected cleaning solution chemicals dosing plant 7, cleaning solution circulating box 8 and graphite heat exchanger 10, cleaning solution chemicals dosing plant 7 and washes
Liquid circulating box 8 is washed for cleaning solution automatic feeding, conveying, graphite heat exchanger 10 is used to lower the temperature cleaning solution.The cleaning solution can be with
Select as alkali lye.
In concrete application example, plate type heat exchanger 9 is provided between biological deodorizing unit 12 and chemical scrubber 6, is used
To cool down the flue gas Jing after the process of chemical scrubber 6, the existence of microorganism in flue-gas temperature appropriate biological odor removal 12 is made.
In concrete application example, it is connected by connecting line between this device unit, and is provided with deodorant blower fan
3rd, centrifugal blower 11, convey to foul smell and flue gas.In the tail end of this device, i.e. the rear end of biological deodorizing unit 12 is provided with row
Inflator 13, for the tail gas after emission treatment, in this example the height of aiutage 13 is 15 meters or so.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
For those of ordinary skill, some improvements and modifications without departing from the principles of the present invention should be regarded as the protection of the present invention
Scope.
Claims (10)
1. the method that the high concentration foul gas that a kind of sludge pyrohydrolysis is produced is processed, it is characterised in that step is：
S1:Pyrohydrolysis foul smell is washed and exchanged heat；The foul smell of pyrohydrolysis release of pressure is lowered the temperature, the water carried secretly in pyrohydrolysis foul smell is removed and is steamed
Gas and sludge, and remove part odorant in foul smell；
S2:Burn deodorant；Foul smell is removed by way of burning；
S3:Chemical washing is deodorant；The oxysulfide and imperfect combustion a small amount of hydrogen sulfide in flue gas is removed by chemical washing；
S4:Biological deodorizing；Foul smell is processed using microorganism, is translated into inorganic matter, last foul smell qualified discharge.
2. the method that the high concentration foul gas that sludge pyrohydrolysis according to claim 1 is produced is processed, it is characterised in that
High-temperature-hot-water solution foul smell is reduced to into 20～40 DEG C in step S1.
3. the method that the high concentration foul gas that sludge pyrohydrolysis according to claim 1 is produced is processed, it is characterised in that
With natural gas or biogas as fuel in step S2, hydrogen sulfide and organic odor gas in pyrohydrolysis are removed by burning.
4. the method that the high concentration foul gas that sludge pyrohydrolysis according to claim 3 is produced is processed, it is characterised in that
The ignition temperature is 600～1100 DEG C, or 850～1000 DEG C.
5. the side that the high concentration foul gas that the sludge pyrohydrolysis according to any one in Claims 1 to 4 is produced is processed
Method, it is characterised in that detergent is NaOH in step S3, configures pH value of solution=13～14.
6. the side that the high concentration foul gas that the sludge pyrohydrolysis according to any one in Claims 1 to 4 is produced is processed
Method, it is characterised in that microorganism is the one kind or many in sulfur oxidizing bacterium group, nitrifying bacteria community or denitrification flora in step S4
Kind.
7. the device that the high concentration foul gas that a kind of sludge pyrohydrolysis is produced is processed, it is characterised in that include：
Washing heat exchange unit (2), is lowered the temperature the foul smell of pyrohydrolysis release of pressure by heat exchanger and washing tank, in removing pyrohydrolysis foul smell
The vapor and sludge of entrainment, and remove part odorant in foul smell；
Deodorization unit (1) is burned, with natural gas as fuel, the foul gas in foul smell is passed through into burning conversion；
Chemical scrubber (6), is connected, by chemical washing with washing heat exchange unit (2) and the output end for burning deodorization unit (1)
Remove foul smell；
Biological deodorizing unit (12), is connected with the output end of chemical scrubber (6), and odorant is degraded to into two by microorganism
Carbonoxide and water, biological deodorizing unit (12) output end is discharged.
8. the device that the high concentration foul gas that sludge pyrohydrolysis according to claim 7 is produced is processed, it is characterised in that
The tail end of washing heat exchange unit (2) burns deodorization unit (1), the chemistry by a foul smell flue gas heat-exchange unit (4) connection
A flue gas fast cooling device (5) is set between scrubbing tower (6) and burning deodorization unit (1), to the flue gas for cooling down incinerator discharge.
9. the device that the high concentration foul gas that sludge pyrohydrolysis according to claim 7 is produced is processed, it is characterised in that
The chemical scrubber (6) is connected with cleaning solution automatic liquid-feeding equipment, and the cleaning solution automatic liquid-feeding equipment includes that what is be connected washes
Wash liquid chemicals dosing plant (7), cleaning solution circulating box (8) and graphite heat exchanger (10), the cleaning solution chemicals dosing plant (7) and cleaning solution
, for cleaning solution automatic feeding, conveying, the graphite heat exchanger (10) to cleaning solution for lowering the temperature for circulating box (8).
10. the dress that the high concentration foul gas that the sludge pyrohydrolysis according to any one in claim 7～9 is produced is processed
Put, it is characterised in that be provided with plate type heat exchanger (9) between the biological deodorizing unit (12) and chemical scrubber (6), to
Cool down the flue gas Jing after chemical scrubber (6) process.
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| CN201611240853.8A CN106621791B (en) | 2016-12-29 | 2016-12-29 | Method and device for treating high-concentration malodorous gas generated by sludge pyrohydrolysis |
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| CN201611240853.8A CN106621791B (en) | 2016-12-29 | 2016-12-29 | Method and device for treating high-concentration malodorous gas generated by sludge pyrohydrolysis |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108773992A (en) * | 2018-04-02 | 2018-11-09 | 苏伊士水务工程有限责任公司 | Sludge treatment system and method for treating sludge by using same |
| CN111013311A (en) * | 2019-12-26 | 2020-04-17 | 四川深蓝环保科技有限公司 | Advanced treatment system and method for hydrothermal waste gas |
| CN112607982A (en) * | 2020-12-16 | 2021-04-06 | 湖南军信环保股份有限公司 | Sludge pyrohydrolysis system and sludge anaerobic digestion system |
| CN114471068A (en) * | 2021-12-09 | 2022-05-13 | 武汉钢铁有限公司 | Comprehensive treatment method for sludge odor |
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| CN108773992A (en) * | 2018-04-02 | 2018-11-09 | 苏伊士水务工程有限责任公司 | Sludge treatment system and method for treating sludge by using same |
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