CN102382689A - 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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- CN102382689A CN102382689A CN2011102274411A CN201110227441A CN102382689A CN 102382689 A CN102382689 A CN 102382689A CN 2011102274411 A CN2011102274411 A CN 2011102274411A CN 201110227441 A CN201110227441 A CN 201110227441A CN 102382689 A CN102382689 A CN 102382689A
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- furnace gas
- calcium carbide
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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 of adopting; The work feed bag dust collector carries out udst separation then; Its brief description of the process is: extracting dust content out from furnace of calcium carbide is that 50～150g/Nm3, temperature are that 600～800 ℃ high-temperature furnace gas is delivered to one-level void tower+secondary whirlwind cooling and lowered the temperature; Control calcium carbide furnace gas temperature≤250 ℃ is delivered to the blowback sack cleaner with the supercharging of thick furnace gas blower fan and is carried out udst separation, the calcium carbide furnace gas repressurize carrying device battery limit (BL) after the purification.
Though along with Chinese economic development; The flue gas cleaning method that adopts at present mainly is to introduce the technical technology of having improved of ELkem; And obtained certain success, but also exist following problem to demand perfection urgently and solve: (1) because of the calcium carbide furnace gas flue is long, the furnace gas fluctuation is big, characteristics such as dust and tar content height in the furnace gas, causes negative pressure heat-exchange system pressure to fall changing frequent; Furnace pressure only is difficult to control through flue variable valve or thick furnace gas fan frequency conversion, can't realize the relatively stable of furnace pressure.(2) the negative pressure heat exchange is adopted in traditional flue gas cleaning, and heat exchange adopts air cooler, causes the material and the seal request of equipment highly, if in case because of reasons such as ageing equipments, air will be inhaled in the interchanger, and this will cause blast easily, have serious potential safety hazard.(3) influence because of operated by furnace of calcium carbide, furnace of calcium carbide tolerance fluctuation ratio are big and frequent, cause blower fan and sack cleaner are operated extremely instability, and equipment is very easily damaged, sack cleaner shortening in work-ing life.
Summary of the invention
In order to solve the problem that exists in the prior art; The present invention provides a kind of calcium carbide furnace gas malleation dry method dust purifying method; The equipment explosive of frequently bringing owing to negative pressure heat-exchange system pressure change in the solution prior art, furnace of calcium carbide tolerance fluctuation ratio are big 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 may further comprise the steps:
(1) be 400～500Nm with flow
3/ t calcium carbide furnace gas approximately contains tar 150～600mg/Nm when furnace of calcium carbide is extracted out
3, dust 50～150g/Nm
3, temperature is 600～800 ℃ high-temperature furnace gas, with dustiness after the udst separation be≤30mg/Nm
3, temperature is for being after 60～150% furnace gas that furnace of calcium carbide is extracted the furnace gas amount out mixes with injector less than 225 ℃, flow, the pressure-controlling that makes calcium carbide furnace gas>=more than the 1200Pa;
(2) mix the back temperature be 400～500 ℃, the relative constant calcium carbide furnace gas of flow with the cooling of whirlwind air cooler, deliver to tubular heat exchange again and carry out heat exchange, make to export the calcium carbide furnace gas temperature and be controlled at≤250 ℃;
(3) the refrigerative calcium carbide furnace gas is delivered to the sack cleaner dedusting, control dust content≤20mg/Nm
3Outside booster fan carrying device battery limit (BL).
The furnace of calcium carbide furnace pressure is-50～50Pa in the said step (1); Furnace gas after the 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.
Calcium carbide furnace gas is cooled to 250～350 ℃ with the whirlwind air cooler in the said step (2).
Sack cleaner carries out the timing blowback through back blowing machine utilization purification furnace gas to cloth bag in the said step (3).
Advantage and positively effect that compared with present technology the present invention is had are:
1. compare with traditional negative pressure heat exchange; 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 the 1200Pa, make the heat-exchange system positive pressure operation, reduced production risk; Eliminate potential safety hazard from technology, satisfied requirement of safe production.
2. the blower fan that refluxes adopts VFC, and the holding furnace airshed is relatively stable behind the injection, helps better controlling furnace pressure, improves the operating rate of furnace of calcium carbide, increases output.
3. the holding furnace airshed is relatively stable behind the injection, helps heat exchange and bag-type dust removal system stable operation, reduces the influence of furnace gas fluctuation to equipment and sack cleaner, prolongs the work-ing life of equipment, reduces maintenance cost.
4. malleation flue gas cleaning method adopts the heat exchange mode of air cooling+tubulation, more has utilization to advance the sack cleaner temperature controlling with seasonal variation, has promptly prevented the possibility that overtemperature burns cloth bag, has solved again because of winter temperature is low, is prone to the problem of dewfall sticky cloth bag.
5. the holding furnace airshed is relatively stable behind the injection, 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 keeping the stable method of furnace pressure.
Description of drawings
Fig. 1 is a 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-, three 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
Further describe through concrete embodiment below in conjunction with 1 pair of technical process of the present invention of accompanying drawing.
Flow is 400～500Nm
3/ t, tar 150～600mg/Nm
3, dust 50～150g/Nm
3, temperature is that the high-temperature furnace gas 11 of 600～800 ℃ (instantaneous 1000 ℃) is extracted out from furnace of calcium carbide 1, behind water cooled pipeline, temperature is reduced to 500～600 ℃, with dustiness after the udst separation is≤30mg/Nm
3, temperature for≤225 ℃, flow be furnace of calcium carbide extract furnace gas 11 amounts out 60～150% furnace gas with injector 2 mixing after; Deliver to 3 coolings of secondary cooling cyclone more than the pressure>=1200Pa of control calcium carbide furnace gas; The control temperature out is 250～350 ℃; Deliver to tubular heat exchange 4 again and carry out heat exchange, it is heat-eliminating medium that tubular heat exchange 4 adopts air, considers to adopt many group aerofoil fans to carry out the VFC temperature out during technological design; Make outlet calcium carbide furnace gas temperature 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 the 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, utilize the purification furnace gas that cloth bag is carried out the timing blowback through back blowing machine 8 is set, to reach the purpose of deashing.Extracting the clean furnace gas of calcium carbide furnace gas blended of managing out out with furnace of calcium carbide 1 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 purification method of the present invention is described this being not limited property of description.If those of ordinary skill in the art is inspired by it, under the situation that does not break away from creation aim of the present invention, design and the same or analogous in fact technical scheme of this invention without creationary, 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, may further comprise the steps:
(1) be 400～500Nm with flow
3/ t calcium carbide furnace gas approximately contains tar 150～600mg/Nm when furnace of calcium carbide is extracted out
3, dust 50～150g/Nm
3, temperature is 600～800 ℃ high-temperature furnace gas, with dustiness after the udst separation be≤30mg/Nm
3, temperature is for being after 60～150% furnace gas that furnace of calcium carbide is extracted the furnace gas amount out mixes with injector less than 225 ℃, flow, the pressure-controlling that makes calcium carbide furnace gas>=more than the 1200Pa;
(2) mix the back temperature be 400～500 ℃, the relative constant calcium carbide furnace gas of flow with the cooling of whirlwind air cooler, deliver to tubular heat exchange again and carry out heat exchange, make to export the calcium carbide furnace gas temperature and be controlled at≤250 ℃;
(3) the refrigerative 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. according to the said calcium carbide furnace gas malleation of claim 1 dry method dust purifying method, it is characterized in that the furnace of calcium carbide furnace pressure is-50～50Pa in the said step (1).
3. according to the said calcium carbide furnace gas malleation of claim 1 dry method dust purifying method, it is characterized in that calcium carbide furnace gas is cooled to 250～350 ℃ with the whirlwind air cooler in the said step (2).
4. according to the said calcium carbide furnace gas malleation of claim 1 dry method dust purifying method, it is characterized in that the furnace gas in the said step (1) after the udst separation is provided by the backflow blower fan, return pressure and flow are controlled by fan frequency conversion according to the furnace pressure of furnace of calcium carbide.
5. according to the said calcium carbide furnace gas malleation of claim 1 dry method dust purifying method, it is characterized in that sack cleaner carries out the timing blowback through back blowing machine utilization purification furnace gas to cloth bag in the said step (3).
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| CN2011102274411A CN102382689B (en) | 2011-08-09 | 2011-08-09 | Positive-pressure dry dust removing and purifying method for calcium carbide furnace gas |
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| CN2011102274411A CN102382689B (en) | 2011-08-09 | 2011-08-09 | Positive-pressure dry dust removing and purifying method for calcium carbide furnace gas |
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| CN102382689B CN102382689B (en) | 2013-12-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104324730A (en) * | 2012-12-28 | 2015-02-04 | 邓世碧 | Catalyst for calcium carbide furnace gas deoxidation and preparation method thereof |
| CN107328248A (en) * | 2017-07-06 | 2017-11-07 | 成都易态科技有限公司 | The Industrial Stoves flue gas cleaning system of Industrial Stoves control method and application this method |
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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 |
-
2011
- 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104324730A (en) * | 2012-12-28 | 2015-02-04 | 邓世碧 | Catalyst for calcium carbide furnace gas deoxidation and preparation method thereof |
| CN107328248A (en) * | 2017-07-06 | 2017-11-07 | 成都易态科技有限公司 | The Industrial Stoves flue gas cleaning system of Industrial Stoves control method and application this method |
| 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 |
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| CN102382689B (en) | 2013-12-11 |
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