CN108211626A

CN108211626A - Exhaust gas purification system and purification method after a kind of domestic garbage pyrolysis gasification

Info

Publication number: CN108211626A
Application number: CN201810097281.5A
Authority: CN
Inventors: 孙艳艳; 陈正元; 金夏; 金俊哲
Original assignee: 上海清暄环保科技有限公司
Priority date: 2018-01-31
Filing date: 2018-01-31
Publication date: 2018-06-29

Abstract

Exhaust gas purification system after gasifying the invention discloses a kind of domestic garbage pyrolysis, the house refuse thermal pyrolysis device formed including pyrolysis oven, dual firing chamber and heat exchanger by pipeline successively drop-over, it is characterized in that, the exhaust gas cleaner being connect with heat exchanger is further included, the exhaust gas cleaner is included through pipeline successively the first spray column of drop-over, the second spray column, low-temperature plasma purifying device and third spray column.Advantageous effect：Above-mentioned technical proposal is taken to purify the tail gas after refuse pyrolysis gasification process so that clean-up effect is thoroughly and guarantee is safe；It is basic to realize exhaust gas, tail gas zero-emission, reduce the pollution to air, environment.

Description

Exhaust gas purification system and purification method after a kind of domestic garbage pyrolysis gasification

Technical field

The present invention relates to technical field of waste treatment, tail gas clean-up system after more particularly to a kind of domestic garbage pyrolysis gasification System.

Background technology

House refuse forms long-term existence in environment by a variety of pollutant components, be various pathogenic microorganisms evil Radix Rehmanniae and Chemical, physics and biological conversion can occur under certain condition for breeding farm.If disposition, mismanagement, pollutant component Environment will be polluted by approach such as water, gas, soil, food chains, be detrimental to health.At present, China's separate waste collection rate It is low, mostly it is mixed collection, harmless treatment rate is not high, generally takes the processing mode of sanitary landfills, power generation by waste combustion, compost etc.,

Each technology has its defective：

1) sanitary filling field requirement is high, and the intractabilities such as percolate, heavy metal are big, occupies large amount of land resources, during stop Between it is long, easily cause soil, water pollution, it is impossible to fundamentally realize garbage harmless；

2) power generation by waste combustion investment is big, and construction scale is big, can generate the secondary pollutions such as dioxin, for economic benefit, once Property treating capacity is big, it is difficult to take into account Small Urban, country life rubbish；

3) compost treatment technology is still not mature enough, and the period is long, takes up a large area, and glass, plastics etc. cannot be by microorganisms point Solution needs further developmental research；

4) garbage classification effect is poor, mixed processing, and reproducible utilization resource could not be recycled effectively, harmless treatment effect Difference restricts sustainable development.

Increasing house refuse generates serious environmental problem.At present, the innoxious place of China's domestic waste Reason rate is about 60%, and the harmless treatment rate of urban and rural domestic refuse is about 30%, and the resource rate that is recycled is lower.

Therefore just there is the appearance of refuse pyrolysis gasification system, refuse pyrolysis can be made to be reused after gasifying to its thermal energy, But the tail gas after pyrolytic gasification can not really be handled, and many harmful substances are still contained in these tail gas, it is impossible to directly be arranged It is put into air.

Invention content

The purpose of the present invention is overcoming defect of the existing technology, tail gas is net after providing a kind of domestic garbage pyrolysis gasification Change system can make rubbish realize site, miniaturization, harmless treatment, and the tail gas after garbage disposal can be made up to standard Discharge.

The present invention is realized by following technical solution：

Exhaust gas purification system after a kind of domestic garbage pyrolysis gasification, passes through pipe including pyrolysis oven, dual firing chamber and heat exchanger The road house refuse thermal pyrolysis device that drop-over forms successively, which is characterized in that it is net to further include the tail gas being connect with heat exchanger Makeup is put, and the exhaust gas cleaner is included through pipeline successively the first spray column of drop-over, the second spray column, low-temperature plasma Purifier and third spray column.

As a further improvement, it is additionally provided with wind turbine in the gas outlet of the low-temperature plasma purifying device.

As a further improvement, the low-temperature plasma purifying device includes three groups of smoke abatement cleaning positions in parallel and 4 grades The cleaning position that eliminates the unusual smell of series connection.

A kind of exhaust purifying method after domestic garbage pyrolysis gasification, which is characterized in that following steps：

Step 1 carries out spray washing to the tail gas after over-heat-exchanger out by the first spray column；Effect removal Dust and tar in tail gas.

Tail gas after spray washing is carried out spraying cooling by step 2 by the second spray column；

Step 3 purifies the tail gas after spraying cooling by low-temperature plasma purifying device；

Step 4, purified gas pass through qualified discharge after third spray column progress spray washing again.

As a further improvement, the gas after spraying cooling will be carried out by the second spray column, and to enter low-temperature plasma net The cleaning positions that eliminate the unusual smell for disguising three groups in putting smoke abatement cleaning positions in parallel and 4 grades of series connection carry out tail gas clean-ups.

As a further improvement, increase by a Fans in the low temp plasma purifier gas outlet, with Ensure a whole set of purifier always be in a state of negative pressure under be fully cleaned up.

Beneficial effects of the present invention are：Above-mentioned technical proposal is taken to carry out the tail gas after refuse pyrolysis gasification process net Change so that clean-up effect is thoroughly and guarantee is safe；It is basic to realize exhaust gas, tail gas zero-emission.

Description of the drawings

Fig. 1 is the system diagram of the present invention.

Specific embodiment

Below in conjunction with attached drawing, the present invention will be further described.

As shown in Figure 1, exhaust gas purification system after a kind of domestic garbage pyrolysis gasification, including pyrolysis oven 1, dual firing chamber 2 and heat The house refuse thermal pyrolysis device that exchanger 3 is formed by pipeline successively drop-over further includes the tail gas being connect with heat exchanger 3 Purifier, exhaust gas cleaner are included through pipeline successively the first spray column 4 of drop-over, the second spray column 5, low-temperature plasma Purifier 6 and third spray column 7, it is contemplated that original wind turbine oepration at full load (wind turbine frequency 48 or so) increases purification The crushing of 800-1000Pa is had after equipment, to ensure the yield of front end slurry-spraying pelletizing machine, original exhaust system is maintained, needs The gas outlet of low-temperature plasma purifying device 6 adds a Fans 8.Low-temperature plasma purifying device 6 includes three groups of parallel connections Smoke abatement cleaning position and 4 grades series connection the cleaning positions that eliminate the unusual smell, in the region since the effect of high voltage electric field is carried out at the same time following three A purification process：1. making a large amount of water fog particles and aerosol becoming positively charged lotus, it is attracted under negative plate gravity and flows down To discharge after being collected.2. make in ionized state odor molecules be stimulated ionize after molecular scission.3. air simultaneously In water and oxygen can also generate the oxidizing species such as OH, active oxygen O, ozone under high energy electron bombardment, these are strong Oxidizing substance can be reacted with odor molecules, make its decomposition, so as to promote off-flavor elimination.

Since the gas that rubbish generates in pyrolysis oven after pyrolytic gasification fully burns by dual firing chamber using heat exchange Device, thermal energy can be reused, and if containing the tail gas direct emission of dust, tar, a small amount of peculiar smell, bioxin etc. The pollution of air can be caused into air, it is therefore desirable to this tail gas clean-up to qualified discharge, purification method such as following steps：

Step 1 sprays the tail gas no more than 150 DEG C after over-heat-exchanger out by the first spray column Washing removes the dust and tar in tail gas, also transfers heat in recirculated water, and gas temperature is 85 DEG C -95 DEG C at this time.

Tail gas after spray washing is carried out spraying cooling by step 2 by the second spray column, and purpose further drops Temperature.

Outlet temperature after spraying cooling is passed through low-temperature plasma purifying device by step 3 no more than 50 DEG C of tail gas It is purified；Also containing bioxin, a small amount of peculiar smell, sulfide, dust, a small amount of organic matter etc. in tail gas at this time.Low temperature etc. The effect of ionic decontamination devices is removal tail gas Zhong bioxin, since bioxin is a kind of granular object under normal temperature state Matter, then after low temperature plasma there is depositing dust of efficiently examining and making cuts, this granular substance can be absorbed, Efficiency than general bag filter or active carbon purifying is high；Some peculiar smell, oxidation operation can also be fallen become two Carbonoxide and water are discharged, and dust can also be filtered.

Step 4, purified gas pass through qualified discharge after third spray column progress spray washing again.Third spray column Effect mainly sulfide is aoxidized after gas, foul gas be excluded in the form of sulfate after being aoxidized come.

The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention All any modification, equivalent and improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.

Claims

1. exhaust gas purification system after a kind of domestic garbage pyrolysis gasification, passes through pipeline including pyrolysis oven, dual firing chamber and heat exchanger The house refuse thermal pyrolysis device that drop-over forms successively, which is characterized in that further include the tail gas clean-up being connect with heat exchanger Device, the exhaust gas cleaner is including by pipeline, the first spray column of drop-over, the second spray column, low-temperature plasma are net successively Makeup is put and third spray column.

2. exhaust gas purification system after a kind of domestic garbage pyrolysis gasification as described in claim 1, which is characterized in that described low The gas outlet of warm plasma purifier is additionally provided with wind turbine.

3. exhaust gas purification system after a kind of domestic garbage pyrolysis gasification as claimed in claim 1 or 2, which is characterized in that described Low-temperature plasma purifying device includes three groups of smoke abatement cleaning positions in parallel and the cleaning position that eliminates the unusual smell of 4 grades of series connection.

4. exhaust purifying method after a kind of domestic garbage pyrolysis gasification as described in claim 1, which is characterized in that following step Suddenly：

Step 1 passes through the powder in the first spray column progress spray washing removing tail gas to the tail gas after over-heat-exchanger out Dirt and tar；

5. exhaust purifying method after a kind of domestic garbage pyrolysis gasification as claimed in claim 4, which is characterized in that will be by the Gas after two spray columns progress spraying cooling enters three groups of smoke abatement cleaning positions and 4 in parallel in low-temperature plasma purifying device The cleaning position that eliminates the unusual smell of grade series connection carries out tail gas clean-up.

6. exhaust purifying method after a kind of domestic garbage pyrolysis gasification as claimed in claim 4, which is characterized in that described low Isothermal plasma purifier gas outlet increases by a Fans, to ensure that a whole set of purifier always is in a state of negative pressure down Be fully cleaned up.