CN102210955A - Casting dust desulfurization and denitration waste gas treatment system - Google Patents
Casting dust desulfurization and denitration waste gas treatment system Download PDFInfo
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Abstract
The invention discloses a casting dust desulfurization and denitration waste gas treatment system. A waste gas discharge outlet of a moulding sand regeneration system is connected in series with a bag type dedusting system, a desulfurization and denitration absorption purification system, a low temperature plasma air purification system and an active carbon air purification system in turn through an exhaust duct system; and the exhaust duct system, the bag type dedusting system, the desulfurization and denitration absorption purification system, the low temperature plasma air purification system and the active carbon air purification system are electrically connected with a control system. The casting dust desulfurization and denitration waste gas treatment system simultaneously achieves the effects of dedusting, desulfurizing and denitrating, and removing odor and peculiar smell.
Description
Technical field
The present invention relates to a kind of waste gas pollution control and treatment system, particularly relate to a kind of casting dust desulphurization denitration waste gas pollution control and treatment system that casting dust desulphurization denitration waste gas purification is handled and steam is controlled.
Background technology
Casting is a kind of method commonly used of machining.The sand reclamation of foundry is the process of resource circulation utilization, but can produce pernicious gas and a large amount of steam such as a large amount of dust, sulfur dioxide, nitrogen dioxide, foul smell peculiar smell in the molding sand regenerative process simultaneously, the material of harmful human bodies such as the flue dust that produces, sulfur dioxide, nitrogen dioxide, foul smell peculiar smell, toxic emission smog behind the roof fills the air everywhere, cause in the operation workshop and the environmental pollution of workshop district, it is healthy directly to influence the workman, there is very big potential safety hazard in long-term work under this environment.Influence surrounding enviroment simultaneously, cause environmental pollution.
Workers with long time operation under above environment if there is not suitable safeguard measure, will cause various occupational diseases, and pernicious gas also can cause pulmonary edema, bronchitis, acute asthma disease, nervous breakdown and chronic respiratory inflammation etc.
The dust sulfur dioxide of the sand reclamation of foundry, nitrogen dioxide, foul smell peculiar smell waste gas pollution control and treatment are global technical barriers, and its difficult point shows: 1. dust size is little, and quality is big, high humidity, steam humidity 100%, filtering difficulty; 2. temperature height, the inlet temperature of dust reaches about 100 ℃, and the selection difficulty requires high to equipment; 3. the water content of dust waste gas is big, and the denitration of common ventilation cleaning technology dust-removal and desulfurizing removes foul smell peculiar smell difficulty.At present, the dust of sand reclamation, sulfur dioxide, nitrogen dioxide, method that foul smell peculiar smell waste gas pollution control and treatment is commonly used had cyclone dust removal+the wet desulfuration tower mode is administered, but regulation effect is undesirable.
The improvement method relatively
Cyclone dust removal is to allow dust waste gas enter in the deduster by tangential direction with a higher speed, utilize the principle of gravity, acceleration, dust is spilt to the deduster inwall, thereby reach the purpose of dedusting, but this method works hardly to fine solid particle, and efficiency of dust collection is lower.
Bag type dust removing technology is to adopt brand-new side air intake mode, air-flow is evenly distributed and pre-dust removing effects is arranged, and during owing to air intake an air-flow component identical with the deashing direction is arranged, and can effectively eliminate " second adsorption " phenomenon of dust, improve cleaning efficiency, reduce equipment resistance.
Make full use of the high characteristic of EGT, allow steam always remain gaseous state in deduster, effectively avoided fouling, stuck with paste the bag phenomenon, adopt terylene Nomex filtrate, its filter material has very high filter efficiency, and the outlet discharging is stable.
Desulfurization is that flue gas desulfurization is the current industrial SO that generally adopts
2Discharge control method.
Can be divided into three kinds of wet method, semidry method and dry desulfurizations by the physical form of product (liquid, solid-state).
The desulfurization absorption of dry desulfurization process and product are handled and are all carried out under dried state, have that equipment corrosion is little, to purify back cigarette temperature high and be beneficial to advantage such as chimney exhaust diffusion, but desulfuration efficiency is low, reaction speed slowly, equipment is huge.
Semi-dry process flue gas desulphurization is the moisture that utilizes in the obvious heat of smoke evaporation lime slurry, simultaneously in the process of drying, and the SO in lime and the flue gas
2Reaction generates calcium sulfite.Semidry process is simpler, and the dry state product is easy to handle, and no waste water produces, and investment generally is lower than conventional wet, but has the problem of the following aspects: the 1. obstruction of container and pipeline; 2. deposition of solid fouling in the absorption tower; 3. sprayer wearing and tearing; 4. the corrosion of flue and deduster; 5. the deduster pressure drop increases.
Wet method sulphur removing and dust removing is at the flue end, adopts slurries agent washing flue gas, and desulfurizing agent and desulfurization product are hygrometric state, be reflected in the solution to carry out, and the calcium utilization height, desulfuration efficiency can reach more than 90%.In above-mentioned three kinds of desulfurization and dust-removal methods, wet desulphurization is wherein a kind of desulfurization method, and dry desulfurization and semi-dry desulphurization progressively are eliminated because desulfuration efficiency is low.
Wet desulphurization absorbs SO in the flue gas with the emulsion of lime stone or lime
2, generate half-H 2 O calcium sulphate or gypsum.The desulfuration efficiency height can reach 90%.
The existing ubiquitous weak point of method is: the 1. high accuracy filtering difficulty of dust; 2. the foul smell peculiar smell is dispeled difficulty, needs further to improve to optimize.ZL 200520074527.5 discloses a kind of assembled smoke gas denitration, dedusting, desulfurizer, but particle dust is not carried out the high accuracy filtering, there is not foul smell peculiar smell air purification systems system, the foul smell peculiar smell is not dispeled purification completely, there is discharging deficiency not up to standard, influences the healthy of peripheral resident.
The national inventing patent specification of publication number CN1843575 and CN101053750 has proposed a kind of method of optic catalytic oxidizing, desulfurizing and denitrifying flue gas simultaneously and the method for device and a kind of flue gas combined desulfurization and denitration respectively, but, there are dust and SO because present photocatalyst activity is lower
2The time photochemical catalyst easy inactivation, also do not reach the ideal effect of expection during practice, can not promote the use of.
Summary of the invention
Technical problem to be solved by this invention provide a kind ofly reach dedusting, desulphurization denitration simultaneously, remove the foul smell peculiar smell casting dust desulphurization denitration waste gas pollution control and treatment system.
In order to solve the problems of the technologies described above, casting dust desulphurization denitration waste gas pollution control and treatment provided by the invention system, it is characterized in that: the Waste gas outlet of sand reclamation system is by exhaust duct system be connected in series successively bag-type dust removing system, desulphurization denitration absorption cleaning system, low-temperature plasma air purification system and activated carbon air purifying system, and described exhaust duct system, bag-type dust removing system, desulphurization denitration absorption cleaning system, low-temperature plasma air purification system and activated carbon air purifying system are electrically connected with control system.
Concrete structure of the present invention is: the Waste gas outlet of sand reclamation system connects the inlet of sack cleaner by exhaust duct, the outlet of described sack cleaner connects the inlet on desulphurization denitration absorption tower by blower fan, described desulphurization denitration absorption tower is provided with water circulating pump, described desulphurization denitration absorption tower is connected with circulatory pool, described circulatory pool is connected with grug feeding jar, the outlet on described desulphurization denitration absorption tower connects the inlet of low-temperature plasma air purification system, the outlet of described low-temperature plasma air purification system connects the inlet of activated carbon air purifying system by the first control air-valve, the outlet of described activated carbon air purifying system connects smoke evacuation chimney by the second control air-valve, and control system is electrically connected with the electric control system of all devices.
Adopt the casting dust desulphurization denitration waste gas pollution control and treatment system of technique scheme, be to contain the sand reclamation system of high temperature high humidity as administering object, utilizing bag-type dust removing system that the high-temperature dust that contains a large amount of steam of sand reclamation system is collected filters, purify, utilize desulphurization denitration absorption cleaning system that the high-temp waste gas after filtering is carried out the spray cooling dehumidifying, in the absorption and waste gas in sulfur dioxide, nitrogen dioxide, the foul smell peculiar smell, utilize the low-temperature plasma air purification system that the foul smell peculiar smell is assisted purification, the gas that utilizes the activated carbon air purifying system that the workshop is discharged carries out deep purification, thereby guarantees qualified discharge.The present invention utilizes bag type dust removing technology, adopts brand-new side air intake mode, and air-flow is evenly distributed and pre-dust removing effects is arranged, because an air-flow component identical with the deashing direction is arranged during air intake, can effectively eliminate " second adsorption " phenomenon of dust, improve cleaning efficiency, reduce equipment resistance.Make full use of the high characteristic of EGT, allow steam always remain gaseous state in bag-type dust removing system, effectively avoided fouling, stuck with paste the bag phenomenon, adopt terylene Nomex filtrate, its filter material has very high filter efficiency, and the outlet discharging is stable.The present invention utilizes desulphurization denitration absorption cleaning system, the inlet on the desulphurization denitration absorption tower of desulphurization denitration absorption cleaning system adopts tangential, downward mode of entrance, make flue gas impact storing liquid in tower, form certain water smoke that seethes, and make flue gas in tower, form swirling flow, be dissipated into evenly lifting behind the total cross-section of desulphurization denitration absorption tower; Solved the inadequate problem of reaction.The present invention is provided with fog-spray nozzle in the smoke inlet section on desulphurization denitration absorption tower, is used for the cooling rapidly of processed flue gas, makes dust granules, oil mist particles in the flue gas stream be subjected to water saturation, converge, and is convenient to subsequent washing; Venturi rod layer is set at the middle part on desulphurization denitration absorption tower, utilizes the venturi characteristic to make flue gas in compression process, will stand particles such as water saturated dust, mist of oil and further condense; What produce when flue gas passes venturi rod layer diffuses in the process, because the quality of saturated particle changes, under the souring of washing agent, peels off with flue gas; Because the kinetic energy that flue gas takes place when passing through venturi rod layer diffuses, make spray water form turbosphere on venturi rod layer top, fully reaction takes place at this and desulfurization cleaning solution in what contain unstripped particle, peels off materials such as dust granules in desulfurization once more; Discharge after thoroughly the clean flue gas after the washing is removed moisture by the demister that is arranged on desulphurization denitration adsorption tower top; Demister is provided with bilayer; Demister all is provided with the spray irrigation device up and down, regularly/surely hinders dual mode cleaning demister.The purification of foul smell peculiar smell of the present invention and pernicious gas is to be finished by the low-temperature plasma air purification system.The air that will contain foul smell peculiar smell and pernicious gas is sent into the low-temperature plasma air purification system by the exhaust duct system, to pernicious gas through the low-temperature plasma air purification system purification, discharging again after the purification, satisfy atmosphere pollutants emission standards, solved the secondary environmental pollution problem that direct discharging brings.The present invention combines molding sand temperature, the control of pipeline air humidity with dedusting.For the sand reclamation workshop, the temperature that requires molding sand in the sand reclamation system is less than 45 ℃, to guarantee workpiece quality.In dust waste gas air treatment system, utilize desulphurization denitration absorption cleaning system and low-temperature plasma air purification system that pipeline waste gas is purified and dehumidify, steam is fully caught qualified discharge.The present invention adopts the activated carbon air purifying system, and the big feature of porous, specific area of performance active carbon to the abundant purified treatment of waste gas in the pipeline, reaches the discharging standards discharging fully.The present invention is controlled system automatically by the control software of special use.Adjusting adds dose and realizes that desulfurization and denitrification reaction is abundant; Regulate filter cylinder blowback time and blowback interval according to the pressure reduction of filter cylinder import and outlet; The fresh water (FW) control valve of control desulphurization denitration absorption cleaning system and the aperture of magnetic valve are regulated amount of makeup water and are added dose; Regulate the electric current of high-pressure modular, the safeguard protection of Control of Voltage ion reactor; According to the pressure of activated carbon air purifying system, regulate the aperture that adsorption box switches air-valve and exhaust valve, guarantee carrying out smoothly of air cleaning.
In sum, the present invention adopts the air cleaning mode of bag-type dusting+desulphurization denitration absorption tower+low-temperature plasma+charcoal absorption, reaches dedusting simultaneously, desulphurization denitration, removes the function of foul smell peculiar smell.
Description of drawings
Fig. 1 is a structural representation of the present invention.
The specific embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
Referring to Fig. 1, the Waste gas outlet of sand reclamation system 1 connects the inlet of sack cleaner 2 by exhaust duct, the outlet of sack cleaner 2 connects the inlet on desulphurization denitration absorption tower 5 by blower fan 3, desulphurization denitration absorption tower 5 is provided with water circulating pump 4, desulphurization denitration absorption tower 5 is connected with circulatory pool 13, the platform 14 of circulatory pool 13 is provided with the grug feeding jar 6 that is connected with circulatory pool 13, the outlet on desulphurization denitration absorption tower 5 connects the inlet of low-temperature plasma air purification system 7, the outlet of low-temperature plasma air purification system 7 connects the inlet of activated carbon air purifying system 9 by the first control air-valve 8, the outlet of activated carbon air purifying system 9 connects smoke evacuation chimney 12 by the second control air-valve 10, and control system 11 is electrically connected with the electric control system of all devices.
Embodiment 1:
The hot and humid waste gas that contains dust sulfur dioxide nitrogen oxide foul smell peculiar smell of 1 li generation of sand reclamation system of foundry is collected through air-suction cover, be transported to the efficient filtering of carrying out dust in the sack cleaner 2 by exhaust duct, send into cool-down dehumidification desulphurization denitration processing in the desulphurization denitration absorption tower 5 through the negative pressure draft effect of blower fan 3 again, purify through low-temperature plasma air purification system 7 again, again qualified discharge behind activated carbon air purifying system 9 deep purifyings.
Embodiment 2:
Low-temperature plasma air purification system 7 adopts the reactor of tubular type, and at this moment, what pipeline was interior contains humid gas under the effect of static, and steam is dispeled fully, and other step is identical with embodiment 1.
Embodiment 3:
The used sack cleaner 2 of the present invention is to adopt terylene Nomex filtrate, filter bag φ 165*2700mm, bag cage material cold drawn wire (whole zinc-plated); Can be corrosion-resistant, high temperature resistant, hydrolysis, hydroscopicity have only 4%, good permeability.Adopt side air intake mode, air-flow is evenly distributed and pre-dust removing effects is arranged, and during owing to air intake an air-flow component identical with the deashing direction is arranged, and can effectively eliminate " second adsorption " phenomenon of dust, improves cleaning efficiency, reduces equipment resistance.Make full use of the high characteristic of EGT, allow steam in sack cleaner 2, always remain gaseous state, effectively avoided fouling, stuck with paste the bag phenomenon
Embodiment 4:
The used desulphurization denitration absorption tower 5 of the present invention is a φ 1200*H6000mm Double-Tower Structure, and material is the stainless steel inner lining grinding stone; Corrosion resistance is strong.Venturi rod layer is set at the middle part on desulphurization denitration absorption tower 5, utilizes the venturi characteristic to make flue gas in compression process, will stand particles such as water saturated dust, mist of oil and further condense; Because the kinetic energy that flue gas takes place when passing through venturi rod layer diffuses, make spray water form turbosphere on venturi rod layer top, fully reaction takes place at this and desulfurization cleaning solution in what contain unstripped particle, peels off materials such as dust granules in desulfurization once more; Discharge after thoroughly the clean flue gas after the washing is removed moisture by the demister that is arranged on 5 tops, desulphurization denitration absorption tower; Demister is provided with bilayer; Demister all is provided with the spray irrigation device up and down, regularly/surely hinders dual mode cleaning demister.
Embodiment 5:
The low-temperature plasma air purification device adopts the tubular type plasma generator in the used low-temperature plasma air purification system 7 of the present invention, ionic tube can be φ 32, φ 40, φ 50, φ 76, φ 89, φ 110, length can be 100mm, 200mm, 300mm, 400mm, 500mm, 600mm, be added with quartz glass tube between the discharge electrode as dielectric impedance, improve purification efficiency.
Embodiment 6:
The active carbon that the activated carbon air purifying device is adopted in the used activated carbon air purifying system 9 of the present invention is 150 * 150 * 150mm Alveolate activated carbon capable, Alveolate activated carbon capable has bigger specific area and porosity, absorption property is good, and foul smell is dispeled effect and reached more than 95%.
Embodiment 7:
The control system 11 that this integrated system adopts is carried out intelligent automatic control by the control software and the PLC of special use to system.Adjusting adds dose and realizes that desulfurization and denitrification reaction is abundant; Regulate filter cylinder blowback time and blowback interval according to the pressure reduction of filter cylinder import and outlet; The fresh water (FW) control valve of control system for desulfuration and denitration and the aperture of magnetic valve are regulated amount of makeup water and are added dose; Regulate the electric current of high-pressure modular, the safeguard protection of Control of Voltage ion reactor; According to the pressure of activated carbon system, regulate the aperture that adsorption box switches air-valve and exhaust valve, guarantee carrying out smoothly of air cleaning.
The invention has the beneficial effects as follows the dust emission≤8.2mg/m that produces in the sand reclamation process that makes foundry
3, sulfur dioxide (SO2) emissions≤2.87mg/m
3, discharged nitrous oxides≤3.61mg/m
3, pernicious gas odor concentration discharging≤389mg/m
3, NMHC discharging≤1.1mg/m
3
Spectrum Buddhist nun test uses instrument that GC-MS, electronic balance, ultraviolet specrophotometer, gas chromatograph, full-automatic smoke dust sampling instrument 3012H, hand-held smoke detecting instrument testopro350 are arranged.
By the present invention the dust, sulfur dioxide, nitrogen oxide and the pernicious gas that produce in the sand reclamation process of foundry are purified, the steam discharging reaches technological requirement, and the working space of a cleaning is provided.Solve the dust that produces in the sand reclamation process of foundry and gone the difficult problem of dispelling, the cooling and the dehumidifying problem of the dust waste gas that produces in the sand reclamation process of foundry have been solved, solved the purifying problem of the sulfur dioxide that produces in the sand reclamation process of foundry, nitrogen oxide, foul smell peculiar smell, for generally applying of native system provides reliable guidance, administering for the dust waste gas purification of the sand reclamation process of foundry provides final solution.
Claims (2)
1. cast dust desulphurization denitration waste gas pollution control and treatment system for one kind, it is characterized in that: the Waste gas outlet of sand reclamation system is by exhaust duct system be connected in series successively bag-type dust removing system, desulphurization denitration absorption cleaning system, low-temperature plasma air purification system and activated carbon air purifying system, and described exhaust duct system, bag-type dust removing system, desulphurization denitration absorption cleaning system, low-temperature plasma air purification system and activated carbon air purifying system are electrically connected with control system.
2. casting dust desulphurization denitration waste gas pollution control and treatment according to claim 1 system, it is characterized in that: the Waste gas outlet of sand reclamation system (1) connects the inlet of sack cleaner (2) by exhaust duct, the outlet of described sack cleaner (2) connects the inlet on desulphurization denitration absorption tower (5) by blower fan (3), described desulphurization denitration absorption tower (5) is provided with water circulating pump (4), described desulphurization denitration absorption tower (5) is connected with circulatory pool (13), described circulatory pool (13) is connected with grug feeding jar (6), the outlet on described desulphurization denitration absorption tower (5) connects the inlet of low-temperature plasma air purification system (7), the outlet of described low-temperature plasma air purification system (7) connects the inlet of activated carbon air purifying system (9) by the first control air-valve (8), the outlet of described activated carbon air purifying system (9) connects smoke evacuation chimney (12) by the second control air-valve (10), and control system (11) is electrically connected with the electric control system of all devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN105688622A (en) * | 2014-11-28 | 2016-06-22 | 中冶长天国际工程有限责任公司 | A flue gas desulphurization denitration method adopting two adsorption columns in series connection and a device therefor |
| CN106422694A (en) * | 2016-08-07 | 2017-02-22 | 黄立维 | Method and device for removing sulfur dioxide and nitrogen oxide from airflow |
| CN106861404A (en) * | 2017-04-10 | 2017-06-20 | 黄嘉铭 | A kind of foul gas cleaning treatment system |
| CN106955535A (en) * | 2017-03-20 | 2017-07-18 | 合肥睿涌陶瓷材料科技有限公司 | A kind of waste gas recovery processing unit for thermal spraying apparatus |
| CN107583422A (en) * | 2017-10-23 | 2018-01-16 | 安徽金森源环保工程有限公司 | A kind of low-temperature plasma desulfuring and denitrifying apparatus and desulfurization denitration method |
| CN108686453A (en) * | 2017-04-12 | 2018-10-23 | 宁夏澍侍信息科技有限公司 | A kind of aluminum-bar heating furnace exhaust gas processing device |
| CN109012007A (en) * | 2018-10-19 | 2018-12-18 | 王全龄 | A kind of chimney smoke purification system |
| CN109200693A (en) * | 2018-10-31 | 2019-01-15 | 广州博昊信息科技有限公司 | A kind of desulfuring and denitrifying apparatus of the compressible flue gas of coal-fired plant |
| CN111514723A (en) * | 2020-05-14 | 2020-08-11 | 沈阳鑫迪环境技术有限公司 | Ultralow-emission treatment method for heat source waste gas of waste tire pyrolysis furnace |
| CN111715060A (en) * | 2020-06-24 | 2020-09-29 | 沈锋良 | Industrial harmful waste gas treatment and recovery equipment based on atmospheric pollution control |
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| CN105688622A (en) * | 2014-11-28 | 2016-06-22 | 中冶长天国际工程有限责任公司 | A flue gas desulphurization denitration method adopting two adsorption columns in series connection and a device therefor |
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| CN109012007A (en) * | 2018-10-19 | 2018-12-18 | 王全龄 | A kind of chimney smoke purification system |
| CN109200693A (en) * | 2018-10-31 | 2019-01-15 | 广州博昊信息科技有限公司 | A kind of desulfuring and denitrifying apparatus of the compressible flue gas of coal-fired plant |
| CN111514723A (en) * | 2020-05-14 | 2020-08-11 | 沈阳鑫迪环境技术有限公司 | Ultralow-emission treatment method for heat source waste gas of waste tire pyrolysis furnace |
| CN111715060A (en) * | 2020-06-24 | 2020-09-29 | 沈锋良 | Industrial harmful waste gas treatment and recovery equipment based on atmospheric pollution control |
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Application publication date: 20111012 |