CN102382689B - Positive-pressure dry dust removing and purifying method for calcium carbide furnace gas - Google Patents
Positive-pressure dry dust removing and purifying method for calcium carbide furnace gas Download PDFInfo
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- CN102382689B CN102382689B CN2011102274411A CN201110227441A CN102382689B CN 102382689 B CN102382689 B CN 102382689B CN 2011102274411 A CN2011102274411 A CN 2011102274411A CN 201110227441 A CN201110227441 A CN 201110227441A CN 102382689 B CN102382689 B CN 102382689B
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Abstract
The invention relates to a positive-pressure dry dust removing and purifying method for a calcium carbide furnace gas. The method comprises the following steps of: (1) mixing extracted high-temperature furnace gas with dust-purified furnace gas by using an ejector, and controlling the pressure of the calcium carbide furnace gas to be more than or equal to 1,200 Pa; (2) cooling the mixed calcium carbide furnace gas with a cyclone air cooler, feeding into a tubular heat exchanger for exchanging heat, and controlling the temperature of the calcium carbide furnace gas at the outlet to be less than or equal to 250 DEG C; and (3) feeding the cooled calcium carbide furnace gas to a bag type dust remover for removing dust, controlling the dust content to be less than or equal to 20 mg/Nm<3>, and discharging out of the boundary region of a device by using a booster fan. Compared with the conventional negative-pressure heat exchange, the invention has the advantages that: refluxed and purified calcium carbide furnace gas is adopted to inject out calcium carbide furnace gas with high dust content, the pressure of the calcium carbide furnace gas mixed with the ejector is controlled to be more than or equal to 1200 Pa, and a heat exchange system runs positive pressure, so that the production risk is lowered, the potential safety hazard is eliminated in the aspect of process, and the requirement of safe production is met.
Description
Technical field
The invention belongs to the calcium carbide industry, be specifically related to a kind of calcium carbide furnace gas purifying method.
Background technology
Traditional calcium carbide furnace gas purifies the general negative pressure heat exchange that adopts, then the work feed bag dust collector carries out udst separation, its brief description of the process is: extracting dust content out from furnace of calcium carbide is that high-temperature furnace gas that 50～150g/Nm3, temperature are 600～800 ℃ delivers to that the one-level void tower+secondary rotary wind is cooling is lowered the temperature, control calcium carbide furnace gas temperature≤250 ℃, deliver to blowback bag-type dust collector with the supercharging of thick furnace gas blower fan and carry out udst separation, the calcium carbide furnace gas repressurize carrying device battery limit (BL) after purification.
Although along with China's expanding economy, the flue gas cleaning method adopted at present is mainly to introduce the technical technology of having been improved of ELkem, and obtained certain success, demand perfection urgently and solve but also there are the following problems: (1) is dust and tar content high because the calcium carbide furnace gas flue is long, the furnace gas fluctuation is large, in furnace gas, cause negative pressure heat-exchange system Pressure Drop to change frequent, furnace pressure only is difficult to control by flue variable valve or thick furnace gas fan frequency conversion, can't realize the relatively stable of furnace pressure.(2) traditional flue gas cleaning adopts the negative pressure heat exchange, and heat exchange employing air cooler, causes material and the seal request of equipment high, once if because of reasons such as ageing equipments, air will be inhaled in interchanger, and this will easily cause blast, have serious potential safety hazard.(3) because being subject to the impact of furnace of calcium carbide operation, furnace of calcium carbide tolerance fluctuation ratio is large and frequent, causes blower fan and sack cleaner operation extremely unstablely, and equipment is very easily damaged, and sack cleaner shortens work-ing life.
Summary of the invention
In order to solve problems of the prior art, the invention provides a kind of calcium carbide furnace gas malleation dry method dust purifying method, the equipment explosive of frequently bringing due to negative pressure heat-exchange system pressure change in the solution prior art, furnace of calcium carbide tolerance fluctuation ratio are large and frequently cause equipment very easily to damage, the problem of sack cleaner shortening in work-ing life.
Technical scheme of the present invention is:
A kind of calcium carbide furnace gas malleation dry method dust purifying method comprises the following steps:
(1) by flow, be 400～500Nm
3/ t calcium carbide furnace gas, approximately contain tar 150～600mg/Nm while extracting out from furnace of calcium carbide
3, dust 50～150g/Nm
3, the temperature high-temperature furnace gas that is 600～800 ℃, with dustiness after udst separation, be≤30mg/Nm
3, temperature is that to be less than 225 ℃, flow be after 60～150% furnace gas that furnace of calcium carbide is extracted the furnace gas amount out mixes with injector, the pressure-controlling that makes calcium carbide furnace gas>=more than 1200Pa;
(2) mix after temperature be that the relatively constant calcium carbide furnace gas of 400～500 ℃, flow is cooling with the whirlwind air cooler, then deliver to tubular heat exchange and carry out heat exchange, make to export the calcium carbide furnace gas temperature to be controlled at≤250 ℃;
(3) cooling calcium carbide furnace gas is delivered to the sack cleaner dedusting, control dust content≤20mg/Nm
3outside booster fan carrying device battery limit (BL).
In described step (1), the furnace of calcium carbide furnace pressure is-50～50Pa; Furnace gas after udst separation is provided by the backflow blower fan, and return pressure and flow are controlled by fan frequency conversion according to the furnace pressure of furnace of calcium carbide.
In described step (2), calcium carbide furnace gas is cooled to 250～350 ℃ with the whirlwind air cooler.
In described step (3), sack cleaner carries out the timing blowback by back blowing machine utilization purification furnace gas to cloth bag.
Advantage and positively effect that compared with the prior art the present invention had are:
1. with traditional negative pressure heat exchange, compare, calcium carbide furnace gas injection after adopt to reflux the purifying high calcium carbide furnace gas of dustiness of coming out of the stove, the pressure-controlling that makes the mixed calcium carbide furnace gas of injector >=more than 1200Pa, make the heat-exchange system positive pressure operation, reduced production risk, eliminate potential safety hazard from technique, met the requirement of safety in production.
2. the blower fan that refluxes adopts variable frequency control, and after injection, the holding furnace airshed is relatively stable, is conducive to better control furnace pressure, improves the operating rate of furnace of calcium carbide, increases output.
3. after injection, the holding furnace airshed is relatively stable, is conducive to heat exchange and bag-type dust removal system stable operation, reduces the impact of furnace gas fluctuation on equipment and sack cleaner, in the work-ing life of extension device, reduces maintenance cost.
4. malleation flue gas cleaning method adopts the heat exchange mode of air cooling+tubulation, more has and utilizes the control of with seasonal variation, advancing the bag-type dust actuator temperature, has prevented the possibility that overtemperature burns cloth bag, has solved again because winter temperature is low, easily the problem of dewfall sticky cloth bag.
5. after injection, the holding furnace airshed is relatively stable, and the gas flow rate of heat transfer tube and sack cleaner is also relatively stable, more has to utilize to improve heat exchange and dust removing effects.
The present invention has not only solved the potential safety hazard that negative-pressure operation brings, and has realized effectively maintaining the stable method of furnace pressure.
The accompanying drawing explanation
Fig. 1 is calcium carbide furnace gas malleation dry method dust purifying method process flow diagram of the present invention;
Wherein: the 1-furnace of calcium carbide, the 2-injector, the 3-cooling cyclone, the 4-tubular heat exchange, the thick furnace gas booster fan of 5-, tri-grades of sack cleaners of 6-, the clean furnace gas booster fan of 7-, the 8-back blowing machine, 9-backflow blower fan, 10-goes out the device battery limit (BL), the 11-calcium carbide furnace gas.
Embodiment
Below in conjunction with 1 pair of technical process of the present invention of accompanying drawing, by specific embodiment, further describe.
Flow is 400～500Nm
3/ t, tar 150～600mg/Nm
3, dust 50～150g/Nm
3, temperature is 600～800 ℃ (instantaneous 1000 ℃) high-temperature furnace gas 11 is extracted out from furnace of calcium carbide 1, after water cooled pipeline, temperature is down to 500～600 ℃, with dustiness after udst separation, is≤30mg/Nm
3, temperature is≤225 ℃, flow be furnace of calcium carbide extract furnace gas 11 amounts out 60～150% furnace gas with after injector 2 mixing, deliver to 3 coolings of secondary rotary forced air cooler more than the pressure>=1200Pa of control calcium carbide furnace gas, controlling temperature out is 250～350 ℃, deliver to again tubular heat exchange 4 and carry out heat exchange, it is heat-eliminating medium that tubular heat exchange 4 adopts air, during technological design, consider to adopt many group aerofoil fans to carry out the variable frequency control temperature out, make to export the calcium carbide furnace gas temperature to be controlled at≤250 ℃ of thick furnace gas booster fans 5 of warp deliver to sack cleaner 6 and carry out dedusting, dust content≤30mg/Nm after dedusting
3outside clean furnace gas booster fan 7 carrying device battery limit (BL)s 10.
In order to reach the safety in production needs, sack cleaner 6 will adopt the malleation dedusting, by back blowing machine 8 is set, utilize the purification furnace gas to carry out the timing blowback to cloth bag, to reach the purpose of deashing.The clean furnace gas that the calcium carbide furnace gas of managing out with furnace of calcium carbide 1 extraction mixes is provided by backflow blower fan 9, return pressure and flow will be controlled by fan frequency conversion according to the furnace pressure of furnace of calcium carbide 1, simultaneously, realize that the flow of mixing furnace gas is relatively stable, have to utilize and improve the furnace of calcium carbide operating rate, increase calcium carbide output.
Below schematically calcium carbide furnace gas malleation dry method dust purifying method of the present invention is described, this description does not have restricted.If those of ordinary skill in the art is inspired by it, in the situation that do not break away from creation aim of the present invention, without creationary, design and the same or analogous in fact technical scheme of this invention, all should belong to protection scope of the present invention.
Claims (5)
1. a calcium carbide furnace gas malleation dry method dust purifying method, is characterized in that, comprises the following steps:
(1) by flow, be 400 ~ 500Nm
3/ t calcium carbide furnace gas, approximately contain tar 150 ~ 600 mg/Nm while extracting out from furnace of calcium carbide
3, dust 50 ~ 150g/Nm
3, the temperature high-temperature furnace gas that is 600 ~ 800 ℃, with dustiness after udst separation, be≤30mg/Nm
3, temperature is that to be less than 225 ℃, flow be after 60 ~ 150% furnace gas that furnace of calcium carbide is extracted the furnace gas amount out mixes with injector, the pressure-controlling that makes calcium carbide furnace gas is at>=1200Pa;
(2) mix after temperature be that the relatively constant calcium carbide furnace gas of 400 ~ 500 ℃, flow is cooling with the whirlwind air cooler, then deliver to tubular heat exchange and carry out heat exchange, make to export the calcium carbide furnace gas temperature to be controlled at≤250 ℃;
(3) cooling calcium carbide furnace gas is delivered to the sack cleaner dedusting, control dust content≤20mg/Nm
3outside booster fan carrying device battery limit (BL).
2. calcium carbide furnace gas malleation dry method dust purifying method according to claim 1, is characterized in that, in described step (1), the furnace of calcium carbide furnace pressure is-50 ~ 50Pa.
3. calcium carbide furnace gas malleation dry method dust purifying method according to claim 1, is characterized in that, in described step (2), calcium carbide furnace gas is cooled to 250 ~ 350 ℃ with the whirlwind air cooler.
4. calcium carbide furnace gas malleation dry method dust purifying method according to claim 1, is characterized in that, the furnace gas in described step (1) after udst separation is provided by the backflow blower fan, and return pressure and flow are controlled by fan frequency conversion according to the furnace pressure of furnace of calcium carbide.
5. calcium carbide furnace gas malleation dry method dust purifying method according to claim 1, is characterized in that, in described step (3), sack cleaner purifies furnace gas by the back blowing machine utilization cloth bag is carried out to the timing blowback.
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| CN104324730B (en) * | 2012-12-28 | 2016-08-17 | 汤燕 | A kind of catalyst for calcium carbide furnace gas deoxidation and preparation method thereof |
| CN107328248B (en) * | 2017-07-06 | 2023-12-08 | 成都易态科技有限公司 | Industrial kiln control method and industrial kiln gas purification system applying same |
Citations (7)
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|---|---|---|---|---|
| CN1051870A (en) * | 1989-11-21 | 1991-06-05 | 江苏工学院 | A kind of dry purifying method with furnace gas |
| DE19611119C2 (en) * | 1996-03-21 | 2001-05-23 | Sueddeutsche Kalkstickstoff | Process for cleaning hot, dusty and tarry exhaust gases |
| CN101016484A (en) * | 2006-12-29 | 2007-08-15 | 中国天辰化学工程公司 | Method of purifying calcium carbide furnace gas |
| CN101045193A (en) * | 2006-12-18 | 2007-10-03 | 青海东胜化工有限公司 | Drytype process for purifying tail gas from calcium carbide production furnace |
| CN201108792Y (en) * | 2007-09-19 | 2008-09-03 | 山西三维集团股份有限公司 | Hermetic calcium carbide furnace gas purifying installation |
| CN101441034A (en) * | 2008-12-01 | 2009-05-27 | 合肥合意环保科技工程有限公司 | Method and device for purifying enclosed calcium carbide furnace gas |
| CN201325953Y (en) * | 2008-12-17 | 2009-10-14 | 江苏森泽环保工程科技有限公司 | Furnace gas purification system of closed-type calcium carbide furnace |
-
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- 2011-08-09 CN CN2011102274411A patent/CN102382689B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1051870A (en) * | 1989-11-21 | 1991-06-05 | 江苏工学院 | A kind of dry purifying method with furnace gas |
| DE19611119C2 (en) * | 1996-03-21 | 2001-05-23 | Sueddeutsche Kalkstickstoff | Process for cleaning hot, dusty and tarry exhaust gases |
| CN101045193A (en) * | 2006-12-18 | 2007-10-03 | 青海东胜化工有限公司 | Drytype process for purifying tail gas from calcium carbide production furnace |
| CN101016484A (en) * | 2006-12-29 | 2007-08-15 | 中国天辰化学工程公司 | Method of purifying calcium carbide furnace gas |
| CN201108792Y (en) * | 2007-09-19 | 2008-09-03 | 山西三维集团股份有限公司 | Hermetic calcium carbide furnace gas purifying installation |
| CN101441034A (en) * | 2008-12-01 | 2009-05-27 | 合肥合意环保科技工程有限公司 | Method and device for purifying enclosed calcium carbide furnace gas |
| CN201325953Y (en) * | 2008-12-17 | 2009-10-14 | 江苏森泽环保工程科技有限公司 | Furnace gas purification system of closed-type calcium carbide furnace |
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