CN105199786B - A kind of dust removal method of pulverized coal pyrolysis coal gas of high temperature - Google Patents
A kind of dust removal method of pulverized coal pyrolysis coal gas of high temperature Download PDFInfo
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- CN105199786B CN105199786B CN201510664459.6A CN201510664459A CN105199786B CN 105199786 B CN105199786 B CN 105199786B CN 201510664459 A CN201510664459 A CN 201510664459A CN 105199786 B CN105199786 B CN 105199786B
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- dust
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- tar
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Abstract
The invention provides a kind of dust removal method of pulverized coal pyrolysis coal gas of high temperature, dust-laden heating gas is cooled within the temperature range of 350~400 DEG C by this method, the heavy tar separated out from dust-laden heating gas is obtained, the heavy tar separated out by dust-laden heating gas itself carries out contact washing in dust removing units.Dedusting agent, efficiency of dust collection raising, in addition to the preset heavy tar of dust removing units, it is not necessary to mend dedusting agent outside are used as by the use of the heavy tar that coal gas itself is separated out.Oil gas and semicoke are reclaimed in the high dust-laden coal tar slurry oil pyrolysis for discharging dust removing units, and dust removal process does not produce extra disposal of pollutants.Equipment is simple, and dedusting cost is low, and technique is easily controlled, and is especially suitable for removing of the solid particle less than 5 microns in coal gas.
Description
Technical field
The invention belongs to coal pyrolysis field, it is related to coal gas of high temperature, and in particular to a kind of pulverized coal pyrolysis coal gas of high temperature is removed
Dust collecting method.
Background technology
Pulverized coal pyrolysis has many technologies both at home and abroad, but mainly includes external heating type heat solution, solid heat carrier pyrolysis method, soon
Fast gas pyrolysismethod etc..Wherein solid thermal carriers have in coal gas that dust is big, semicoke ash content；Gas fast pyrogenation is deposited
The problems such as dust is big gas circulation amount is big, the heating cooling recyclegas thermal efficiency is low, in coal gas etc., therefore pulverized coal pyrolysis coal
Dust is common problem greatly in gas, and high-temperature gas duster becomes the industrialized bottleneck problem of pulverized coal pyrolysis.
High-temperature gas duster technology also has a lot, mainly grain bed, ceramic filter, the dedusting such as stainless steel filter
Filter technology, because Bed Filtration efficiency is low, wind speed is low, causes filter area excessive, and investment is big, of the filtering less than 1 micron
Grain is highly difficult；Ceramics and stainless steel filtering material there are problems that analysing charcoal due to coal gas of high temperature, it is easy to block filtering material, cause
Blowback is difficult, and filtering material regeneration frequently waits some row problems, along with the fluctuation of temperature during high-temperature gas duster, Yi Zao
Separated out into tar, block the technology hardly possible that pipeline, the problems such as blocking filtering material, therefore high-temperature gas duster become pyrolysis of coal industry
Topic.
There is the characteristics of efficiency of dust collection is higher using mink cell focus dedusting in theory, but mink cell focus price itself is high, causes
Dedusting cost is high, it is difficult to be widely applied in practice.
The content of the invention
In view of the deficienciess of the prior art, it is an object of the present invention to provide a kind of pulverized coal pyrolysis coal gas of high temperature is removed
Dust collecting method, so that heavy component is dedusting agent in coal gas itself coal tar, by the logistics capacity of control system, realizes that coal gas separates out coal
Tar from the purpose of dedusting, solve coal gas of high temperature in the prior art dust collecting process cost it is high the problem of.
In order to solve the above-mentioned technical problem, the present invention, which is adopted the following technical scheme that, is achieved：
Dust-laden heating gas is cooled to 350~400 DEG C of temperature by a kind of dust removal method of pulverized coal pyrolysis coal gas of high temperature, this method
In the range of degree, the heavy tar separated out from dust-laden heating gas is obtained, the heavy tar separated out by dust-laden heating gas itself exists
Contact washing is carried out in dust removing units.
The present invention also has following distinguishing feature：
Preset heavy tar in described dust removing units.
Solid content must not be higher than 100g/m in described dust-laden heating gas3, the initial temperature of dust-laden heating gas is not
Heavy tar content in 420 DEG C, dust-laden heating gas must be less than and be not less than 100g/m3。
The amount of heavy tar and the dust-laden heating gas entered in dust removing units in the slurry oil discharged in described dust removing units
The amount of precipitation of middle heavy tar is equal.
In the dust-laden coal liquefaction residue slurry oil obtained after described contact washing, the slurry oil that dust content is less than 50wt% is followed
Ring is used；The slurry oil that dust content is more than or equal to 50wt% is pyrolyzed at 600 DEG C, and the oil gas reclaimed in thermal decomposition product enters
Oil-gas Separation is carried out in gas cooling system after dedusting, pyrolysis char is reclaimed.
The coal gas of high temperature obtained after described contact washing carries out cooling and purifying by coal gas cooling and purifying unit, obtains pure
Coal gas and coal tar.
Specifically, this method specifically includes following steps：
Dust-laden heating gas is passed through in dust removing units, the mink cell focus being preset in dust removing units connects to dust-laden heating gas
Washing is touched, dust-laden heating gas is cooled in dust removing units within the temperature range of 350~400 DEG C, heavy tar is from dust-laden hot coal
Separated out in gas, the amount of heavy tar and the dust-laden heating gas entered in dust removing units in the slurry oil discharged in described dust removing units
The amount of precipitation of middle heavy tar is equal so that the heavy tar separated out from dust-laden heating gas can be realized to dust-laden heating gas
The coal gas of high temperature obtained from after washing, dedusting carries out cooling and purifying by coal gas cooling and purifying unit, obtains scrubbed gas and coal tar
Oil.
The dust-laden tar slurry that dust removing units are obtained, the slurry oil that dust content is less than 50wt% returns to dust removing units, circulation
Use；The slurry oil that dust content is more than or equal to 50wt% is pyrolyzed at a temperature of 600 DEG C, and the oil gas in thermal decomposition product enters dedusting
Coal gas cooling and purifying unit afterwards carries out Oil-gas Separation, and pyrolysis char is reclaimed.
The present invention compared with prior art, has the following technical effect that：
The present invention compared with prior art, has the following technical effect that：
(I) dedusting agent, efficiency of dust collection raising, except dust removing units are preset heavy are used as by the use of the heavy tar that coal gas itself is separated out
Outside matter tar, it is not necessary to mend dedusting agent outside.
(II) oil gas and semicoke are reclaimed in the high dust-laden coal tar slurry oil pyrolysis of discharge dust removing units, and dust removal process is not produced additionally
Disposal of pollutants.
(III) equipment is simple, and dedusting cost is low, and technique is easily controlled, and is especially suitable for the solid particle less than 5 microns in coal
Removing in gas.
Brief description of the drawings
Fig. 1 is the integrated artistic flow chart of the present invention.
Explanation is further explained in detail to the particular content of the present invention below in conjunction with accompanying drawing.
Embodiment
Specific embodiment of the invention given below is, it is necessary to which explanation is that the invention is not limited in implement in detail below
Example, all equivalents done on the basis of technical scheme each fall within protection scope of the present invention.
Embodiment：
The present embodiment provides a kind of dust removal method of pulverized coal pyrolysis coal gas of high temperature, as shown in figure 1, temperature is higher than into 400 DEG C
Dust-laden heating gas be passed through in dust removing units, be preset at heavy oil and gas in dust removing units and carry out contact washing, dedusting
Temperature in unit is also in the range of 350-400 DEG C, in dust removing units by being contacted with dust-laden heating gas, by dust-laden heating gas
Dust catching reside in mink cell focus, enter while heavy tar in coal gas is separated out in dedusting slurry oil, contain in dust removing units
The coal liquefaction residue slurry oil that dust concentration is less than 50wt% returns to dust removing units, recycles；Dust content is more than or equal to 50wt%
Coal liquefaction residue slurry oil be pyrolyzed at a temperature of 600 DEG C, the oil gas in thermal decomposition product enters after dedusting in gas cooling system
Oil-gas Separation is carried out, and reclaims semicoke.
The coal gas of high temperature obtained after contact washing passes through the coal gas cooling unit in gas cooling system and coal gas electric fishing list
Scrubbed gas and tar are obtained after member, specifically, being cooled down by coal gas cooling unit, to obtain coal tar and cooled coal gas, wherein coal
Air cooling unit can be direct water-cooling or indirect water-cooling or the mode such as air-cooled indirectly, realize most of tar and coal gas point
From, it is oily finally by coal gas electric fishing unit static tar precipitating, realize that oil gas is kept completely separate.
Using machine oil mink cell focus dedusting result as shown in table 1 to table 4, it be can be seen that from table 1 into table 4：Gas tar is certainly
Dedusting, cost is low, industrially there is great application prospect.
380 DEG C of 1 dust removing units temperature of table is from dedusting efficiency of dust collection
| Gas concentration 50g/M3 | |
| Efficiency of dust collection/% | 99.8 |
| Tar dust-laden/% | 0.15 |
380 DEG C of the preset heavy coal tar of table 2 coal tar fraction from after dedusting is constituted
| Cut | Percentage composition |
| <215 DEG C/% | 22.01 |
| 215-320 DEG C/% | 57.96 |
| >320 DEG C/% | 23.03 |
| Total/% | 100.0 |
360 DEG C of 3 dust removing units temperature of table is from dedusting efficiency of dust collection
| Gas concentration 50g/M3 | |
| Efficiency of dust collection/% | 99.7 |
| Tar dust-laden/% | 0.16 |
360 DEG C of the preset heavy coal tar of table 4 coal tar fraction from after dedusting is constituted
| Cut | Percentage composition |
| <215 DEG C/% | 24.04 |
| 215-320 DEG C/% | 56.05 |
| >320 DEG C/% | 19.91 |
| Total/% | 100.0 |
Claims (4)
1. a kind of dust removal method of pulverized coal pyrolysis coal gas of high temperature, it is characterised in that：Dust-laden heating gas is cooled to 350 by this method~
Within the temperature range of 400 DEG C, the heavy tar separated out from dust-laden heating gas is obtained, the weight separated out by dust-laden heating gas itself
Matter tar carries out contact washing in dust removing units；
Preset heavy tar in described dust removing units；
Solid content must not be higher than 100g/m in described dust-laden heating gas3, the initial temperature of dust-laden heating gas must not be less than
420 DEG C, heavy tar content is not less than 100g/m in dust-laden heating gas3；
Weight in dust-laden heating gas in the slurry oil discharged in described dust removing units in the amount of heavy tar and entrance dust removing units
The amount of precipitation of matter tar is equal.
2. dust removal method as claimed in claim 1, it is characterised in that：The dust-laden coal liquefaction obtained after described contact washing is residual
In residual oil slurry, the slurry oil that dust content is less than 50wt% is recycled；Dust content is more than or equal to 50wt% slurry oil at 600 DEG C
Lower to be pyrolyzed, the oil gas in recovery thermal decomposition product, which enters, carries out Oil-gas Separation in the gas cooling system after dedusting, pyrolysis half
Jiao reclaims.
3. dust removal method as claimed in claim 1, it is characterised in that：The coal gas of high temperature obtained after described contact washing passes through
Coal gas cooling and purifying unit carries out cooling and purifying, obtains scrubbed gas and coal tar.
4. dust removal method as claimed in claim 1, it is characterised in that：This method specifically includes following steps：
Dust-laden heating gas is passed through in dust removing units, the mink cell focus being preset in dust removing units carries out contact to dust-laden heating gas and washed
Wash, dust-laden heating gas is cooled in dust removing units within the temperature range of 350~400 DEG C, heavy tar is from dust-laden heating gas
Separate out, weight in the dust-laden heating gas in the slurry oil discharged in described dust removing units in the amount of heavy tar and entrance dust removing units
The amount of precipitation of matter tar is equal so that the heavy tar separated out from dust-laden heating gas can realize washing certainly to dust-laden heating gas
Wash, the coal gas of high temperature obtained after dedusting carries out cooling and purifying by coal gas cooling and purifying unit, obtains scrubbed gas and coal tar；
The dust-laden tar slurry that dust removing units are obtained, the slurry oil that dust content is less than 50wt% returns to dust removing units, recycles；
The slurry oil that dust content is more than or equal to 50wt% is pyrolyzed at a temperature of 600 DEG C, and the oil gas in thermal decomposition product enters after dedusting
Coal gas cooling and purifying unit carries out Oil-gas Separation, and pyrolysis char is reclaimed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510664459.6A CN105199786B (en) | 2015-10-08 | 2015-10-08 | A kind of dust removal method of pulverized coal pyrolysis coal gas of high temperature |
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| CN201510664459.6A CN105199786B (en) | 2015-10-08 | 2015-10-08 | A kind of dust removal method of pulverized coal pyrolysis coal gas of high temperature |
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| CN105199786B true CN105199786B (en) | 2017-10-31 |
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| CN110368764B (en) * | 2019-07-11 | 2021-05-25 | 中国神华煤制油化工有限公司 | Method for removing microparticles carried in gas |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102533347A (en) * | 2010-12-31 | 2012-07-04 | 中国海洋石油总公司 | Method for separating coal gasification mixed gas |
| CN103275767A (en) * | 2013-05-24 | 2013-09-04 | 张晓� | Method for separating high-temperature gas containing solid dust and tar gas |
| CN104312628A (en) * | 2014-10-21 | 2015-01-28 | 合肥乾海洁净煤技术有限公司 | Primary cooling de-dusting method for high-temperature pyrolysis gas obtained by carrying out full size grading pyrolysis on coal |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102533347A (en) * | 2010-12-31 | 2012-07-04 | 中国海洋石油总公司 | Method for separating coal gasification mixed gas |
| CN103275767A (en) * | 2013-05-24 | 2013-09-04 | 张晓� | Method for separating high-temperature gas containing solid dust and tar gas |
| CN104312628A (en) * | 2014-10-21 | 2015-01-28 | 合肥乾海洁净煤技术有限公司 | Primary cooling de-dusting method for high-temperature pyrolysis gas obtained by carrying out full size grading pyrolysis on coal |
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