CN104492192A - Fluid bed granular layer dust remover-filter element dust remover combined dust removal technique - Google Patents
Fluid bed granular layer dust remover-filter element dust remover combined dust removal technique Download PDFInfo
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- CN104492192A CN104492192A CN201410775195.7A CN201410775195A CN104492192A CN 104492192 A CN104492192 A CN 104492192A CN 201410775195 A CN201410775195 A CN 201410775195A CN 104492192 A CN104492192 A CN 104492192A
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Abstract
The invention discloses a fluid bed granular layer dust remover-filter element dust remover combined dust removal technique for tar-containing flue gas. According to the technique, the tar-containing flue gas is firstly subjected to dust removal by the fluid bed granular layer dust remover and then subjected to dust removal in the filter element dust remover, wherein the filter material of the fluid bed granular layer dust remover is semicoke granules, of which the granularity is 0.3-10mm, the temperature is 300-800 DEG C, the micropore porosity is 6-35% and the bulk porosity is 30-80%. By arranging the fluid bed granular layer dust remover before the filter element dust remover, the dust with the size of 10 mu m above can be firstly removed, thereby lowering the particle size distribution of the flue gas entering the filter element dust remover. The technique has the advantages of low cost and higher dust removal efficiency, and avoids the problem of deep blockage of the filter element.
Description
Technical field
The invention belongs to coal chemical technology, be specifically related to a kind of technique to carrying out mechanical and hydraulic combined dust containing tar flue gas thermopnore gravel bed filter and filter-element dust collector.
Background technology
At present, for coal chemical technology, the high temperature particularly produced after improving quality of coal by pyrolysis, containing tar flue gas, is usually all directly sent into filter-element dust collector and is carried out dust removal by filtration, clean gas after dust removal by filtration is sent into downstream process and is carried out a step process, and ash discharges storage from the bottom of filter-element dust collector.This common process easily produces following problem: 1, easily the precipitation of tar occur because of the fluctuation of variations in temperature and tolerance and blocks filter core, thus causing the operation of whole technique to stop.2, due to particle size widely dispersed, the aperture of filter core is selected very difficult.3, dustiness is excessive, and blowback not in time, easily causes bridging, and pressure increase is too fast, and filter core cannot be worked.4, when temperature fluctuation is larger, the thermal shock of earthenware is easily caused.
Summary of the invention
The present invention is the above-mentioned defect in order to overcome prior art, provides a kind of mechanical and hydraulic combined dust technique containing tar flue gas.
The technical solution adopted for the present invention to solve the technical problems is: thermopnore gravel bed filter and filter-element dust collector mechanical and hydraulic combined dust technique, be first will carry out dedusting through thermopnore gravel bed filter containing tar flue gas, then flue gas sent into filter-element dust collector and carry out dedusting.
Wherein, in above-mentioned technique, the filtrate of described thermopnore gravel bed filter is semicoke particle.
Wherein, in above-mentioned technique, the granularity of described semicoke particle is 0.3 ~ 10mm, and temperature is 300 ~ 800 DEG C.
Wherein, in above-mentioned technique, the micropore rate of described semicoke particle is 6 ~ 35%, and the accumulation porosity of semicoke particle is 30 ~ 80%.
The invention has the beneficial effects as follows: the present invention by arranging thermopnore gravel bed filter before filter-element dust collector, namely containing tar flue gas first through thermopnore gravel bed filter again through filter-element dust collector, thermopnore gravel bed filter can be removed containing the bulky grain in tar flue dust, reduce the distribution of particle size, can conveniently selecting filter core aperture, avoiding because selecting filter core not to causing the deep layer of filter core to block; Also reduce the content of filter-element dust collector Inlet dust simultaneously, reduce the frequency of blowback, avoid putting up a bridge.The selection of filtering material semicoke particle of thermopnore gravel bed filter of the present invention, first semicoke particle is heated, be heated to 300 ~ 1000 DEG C, then carry out two-stage screening and obtain the semicoke particle that granularity is 0.3 ~ 10mm, directly send into thermopnore gravel bed filter and use (300 ~ 800 DEG C) as filtrate.The micropore rate of semicoke particle is 6 ~ 35%, the accumulation porosity of semicoke particle is 30 ~ 80%, particle diameter more than 10 μm dust (accounting for the 50-75% of dust total amount) can be removed, the dust (accounting for the 25-50% of dust total amount) being less than 10 μm enters filter-element dust collector, dust size narrowly distributing, be convenient to filter core aperture and carry out good mating with the particle diameter of particle, avoid the deep layer of filter core to block and (refer to that Flat Membrane internal gutter blocks, regeneration cannot be realized) problem, dust content can be reduced to process goal value by filter-element dust collector easily, thus enter downstream process, particle distribution range is narrower simultaneously, and short grained agglomeration effect (refer to that molecule collides under the high temperature conditions mutually and form oarse-grained process) is more obvious, and under the same terms, efficiency and the precision of dedusting are higher.
Accompanying drawing explanation
Fig. 1 is the general flow chart of the present invention's wherein embodiment.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described.
Thermopnore gravel bed filter of the present invention and filter-element dust collector mechanical and hydraulic combined dust technique first will carry out dedusting through thermopnore gravel bed filter containing tar flue gas, then flue gas is sent into filter-element dust collector and carry out dedusting.
Preferably, in order to make more to mate when thermopnore gravel bed filter and filter-element dust collector conbined usage, in above-mentioned technique, the filtrate of described thermopnore gravel bed filter is semicoke particle.Further preferred, the granularity of described semicoke particle is 0.3 ~ 10mm, and temperature is 300 ~ 800 DEG C; The micropore rate of described semicoke particle is 6 ~ 35%, and the accumulation porosity of semicoke particle is 30 ~ 80%.
In addition, it will be appreciated by those skilled in the art that, micropore rate refers to the ratio of semicoke particle volume shared by the micro pore volume in semicoke particle; Pile up the ratio that porosity refers to the voidage shared heap body cumulative volume between particle.
In concrete operations of the present invention, when the temperature of gas reduces larger, the temperature of raising semicoke that can be suitable, to make up the temperature drop of oil gas, ensures that the inlet temperature of filter-element dust collector is consistent; Namely grain flow movable bed is by the adjustment of semicoke temperature, ensures that the temperature containing flue gas can not produce and significantly changes, avoid the thermal shock of Flat Membrane.When larger fluctuation appears in gas flow, the particle diameter of grain flow movable bed can be reduced or subtract short grained flow rate, increasing the resistance of grain bed, guaranteeing that gas enters the tolerance of filter-element dust collector, pressure is basically identical; When tolerance is less, the flow rate of grain flow movable bed can be increased, reduce its resistance drop, avoid flue gas to fluctuate on a large scale, avoid the problem easily causing bridging.
The present invention is relative to independently dust pelletizing system, this project has the stability of better efficiency of dust collection and dust pelletizing system, and the raw material semicoke particle adopted produces from rotary kiln, its ball-type degree is better, for grain flow movable bed provides many facilities, semicoke is as the accessory substance of pyrolysis in addition, and a large amount of is cost-saving.
Below by embodiment, the specific embodiment of the present invention is described further, but not therefore by protection scope of the present invention restriction in one embodiment.
Embodiment
The former dust collecting process of applicant be by about 550 DEG C containing tar flue gas, direct feeding filter-element dust collector (specification of filter core: 60mm × 1500mm) carries out dust removal by filtration, clean gas after dust removal by filtration is sent into downstream process and is carried out a step process, and ash discharges storage from the bottom of filter-element dust collector.This craft dust removal efficiency can reach 99.96%, and dedusting precision is greater than 0.6 μm.When dustiness containing tar flue gas is greater than 50g/m3, the blowback time approximately needs 6 ~ 8min, and run 7 ~ 10 days due to serious clogging, the pressure drop rise of deduster reaches more than 8kpa, causes dedusting to run.
Due to the fluctuation of tolerance in production process, gas temperature can be caused to change greatly, cause ceramic element thermal shock and rupture.The resistance to thermal shock of ceramic element is generally 5 ~ 6 times.Tolerance fluctuation simultaneously, more than 10% ~ 15%, will be made ceramic element pressure drop more than 5kpa ~ 8kpa, and cannot be recovered by blowback.
Because former technique exists the problems referred to above, applicant rectifies and improves technique, mainly before filter-element dust collector, add thermopnore gravel bed filter, and with 0.3 ~ 10mm, 300 ~ 800 DEG C of semicoke particles as the filtrate of thermopnore gravel bed filter, the micropore rate of semicoke particle is between 6 ~ 35%, and the accumulation porosity of semicoke particle is between 30 ~ 80%.When there is larger fluctuation containing the temperature of tar flue gas or flow etc., simply regulate and control according to the method described in detailed description of the invention.After improvement, efficiency of dust collection can reach 99.996%, and dedusting precision is less than 0.1 micron, and when the dustiness containing tar flue gas is greater than 50g/m3, the blowback time can be increased to 14min ~ 20min, generally may occur clogging at 6 ~ 8 months.
Due to the existence of grain flow movable bed, can adjust the reinforced of the speed of its particle flow and particle, avoid gas flow fluctuation and the temperature wide fluctuations that causes, therefore Flat Membrane can not block.The control of grain bed temperature simultaneously, the flue-gas temperature of its import is basically identical, and the temperature field in Flat Membrane filter cavity is consistent, and thus thoroughly can solve the fracture that thermal shock in normal course of operation causes Flat Membrane.
Claims (4)
1. thermopnore gravel bed filter and filter-element dust collector mechanical and hydraulic combined dust technique, is characterized in that: first will carry out dedusting through thermopnore gravel bed filter containing tar flue gas, then flue gas is sent into filter-element dust collector and carry out dedusting.
2. thermopnore gravel bed filter according to claim 1 and filter-element dust collector mechanical and hydraulic combined dust technique, is characterized in that: the filtrate of described thermopnore gravel bed filter is semicoke particle.
3. thermopnore gravel bed filter according to claim 2 and filter-element dust collector mechanical and hydraulic combined dust technique, is characterized in that: the granularity of described semicoke particle is 0.3 ~ 10mm, and temperature is 300 ~ 800 DEG C.
4. the thermopnore gravel bed filter according to Claims 2 or 3 and filter-element dust collector mechanical and hydraulic combined dust technique, is characterized in that: the micropore rate of described semicoke particle is 6 ~ 35%, and the accumulation porosity of semicoke particle is 30 ~ 80%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410775195.7A CN104492192A (en) | 2014-12-15 | 2014-12-15 | Fluid bed granular layer dust remover-filter element dust remover combined dust removal technique |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410775195.7A CN104492192A (en) | 2014-12-15 | 2014-12-15 | Fluid bed granular layer dust remover-filter element dust remover combined dust removal technique |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB1112309A (en) * | 1964-09-29 | 1968-05-01 | Max Berz | Improved process and apparatus for the separation of solid particles from fluids |
| US20080134893A1 (en) * | 2006-12-08 | 2008-06-12 | Thauming Kuo | Particulate filter media |
| CN101480551A (en) * | 2009-01-04 | 2009-07-15 | 神华集团有限责任公司 | Filtering dust remover and filtering dust removing system as well as dust collection method of system thereof |
| CN203155030U (en) * | 2013-03-28 | 2013-08-28 | 广州市环境保护技术设备公司 | Multi-component rubber mixing waste gas purifying device |
| CN203196504U (en) * | 2013-04-03 | 2013-09-18 | 神木富油能源科技有限公司 | Raw gas dust collection device |
| CN203694778U (en) * | 2013-11-13 | 2014-07-09 | 湖南长重机器股份有限公司 | Porous ceramic dust collector for filtering PM2.5 particle layer |
-
2014
- 2014-12-15 CN CN201410775195.7A patent/CN104492192A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1112309A (en) * | 1964-09-29 | 1968-05-01 | Max Berz | Improved process and apparatus for the separation of solid particles from fluids |
| US20080134893A1 (en) * | 2006-12-08 | 2008-06-12 | Thauming Kuo | Particulate filter media |
| CN101480551A (en) * | 2009-01-04 | 2009-07-15 | 神华集团有限责任公司 | Filtering dust remover and filtering dust removing system as well as dust collection method of system thereof |
| CN203155030U (en) * | 2013-03-28 | 2013-08-28 | 广州市环境保护技术设备公司 | Multi-component rubber mixing waste gas purifying device |
| CN203196504U (en) * | 2013-04-03 | 2013-09-18 | 神木富油能源科技有限公司 | Raw gas dust collection device |
| CN203694778U (en) * | 2013-11-13 | 2014-07-09 | 湖南长重机器股份有限公司 | Porous ceramic dust collector for filtering PM2.5 particle layer |
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