CN105255523B - 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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- CN105255523B CN105255523B CN201510644263.0A CN201510644263A CN105255523B CN 105255523 B CN105255523 B CN 105255523B CN 201510644263 A CN201510644263 A CN 201510644263A CN 105255523 B CN105255523 B CN 105255523B
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- gas
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- dust
- liquefaction residue
- coal liquefaction
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Abstract
The present invention provides a kind of dust removal method of pulverized coal pyrolysis coal gas of high temperature, dust-laden heating gas is passed through in the coal liquefaction residue under liquid condition and carries out contact washing by this method.The dust-laden coal liquefaction residue pyrolysis obtained after the contact washing, low dust content recycle, high dust content pyrolysis recycling oil gas.The coal gas of high temperature obtained after the contact washing after cooling, electric fishing by obtaining scrubbed gas and tar.By the use of coal liquefaction residue as dedusting agent, efficiency of dust collection greatly improves, and dust and liquid coal liquefaction residue medium intermiscibility are good, is easy to trap dust.Coal gas after dedusting carries out pitch coal qi leel from quality of coke tar is good again.High dust-laden coal liquefaction residue enters pyrolysis oven recycling oil gas, and dedusting does not generate disposal of pollutants.
Description
Technical field
The invention belongs to coal pyrolysis fields, are related to coal gas of high temperature, and in particular to a kind of pulverized coal pyrolysis coal gas of high temperature removes
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 there are the problems such as dust in coal gas is big, semicoke ash content is big for solid thermal carriers；Gas fast pyrogenation is deposited
Gas circulation amount is big, the heating cooling cycle gas thermal efficiency is low, dust is big in coal gas the problems such as 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 very much, mainly grain bed, ceramic filter, the dedustings such as stainless steel filter
Filter technology, since 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
The problems such as being precipitated into tar, blocking pipeline, block filtering material, therefore high-temperature gas duster becomes the technology hardly possible of pyrolysis of coal industry
Topic.
Theoretically have the characteristics that efficiency of dust collection is higher using mink cell focus dedusting, but since mink cell focus is compatible with coal tar
Property is bad, and efficiency of dust collection is caused to decline in practice, in addition mink cell focus price itself is high, causes dedusting of high cost, it is difficult in reality
In be widely applied.
Secondly, it is only physics dedusting using mink cell focus dedusting, coal gas refrigerated separation coal gas and tar process after dedusting
In, heavy tar ratio is big, and quality of coke tar is poor.
On the other hand, coal liquefaction residue is currently used primarily in using difficulty and mixes burning power generation, greatly reduced coal liquefaction residue
Comprehensive utilization benefit.
Invention content
In view of the deficiencies of the prior art, the present invention intends to provide a kind of removing for pulverized coal pyrolysis coal gas of high temperature
Dust collecting method using the by-product coal liquefaction residue generated in coal pyrolysis technique as dedusting agent, solves coal gas of high temperature in the prior art
Dust collecting process is of high cost and coal pyrolysis technique in waste the problem of being difficult to recycling, while improve tar lightweight group
Divide ratio, improve quality of coke tar, achieve many things at one stroke.
In order to solve the above-mentioned technical problem, the present invention is realised by adopting the following technical scheme：
Dust-laden heating gas is passed through under liquid condition by a kind of dust removal method of pulverized coal pyrolysis coal gas of high temperature, this method
Contact washing is carried out in coal liquefaction residue.
The present invention also has following distinguishing feature：
In the dust-laden coal liquefaction residue slurry oil obtained after the contact washing, slurry oil of the dust content less than 50wt% follows
Ring uses；Slurry oil of the dust content more than or equal to 50wt% is pyrolyzed at 600 DEG C, and the oil gas recycled in thermal decomposition product enters
Oil-gas Separation, pyrolysis char recycling are carried out in gas cooling system after dedusting.
The coal gas of high temperature obtained after the contact washing is pure by being cooled down in gas cooling system, being obtained after electric fishing
Coal gas and tar.
The temperature of the dust-laden heating gas is higher than 400 DEG C.
The temperature of the coal liquefaction residue under liquid condition is in the range of 300 DEG C~360 DEG C.
The above method specifically includes following steps：
High temperature dust heating gas is passed through and is heated in melting unit equipped with coal liquefaction residue, coal liquefaction residue is heated to place
In liquid condition, then dust-laden heating gas and the coal liquefaction residue under liquid condition, which are admitted to dust removing units and carry out contact, washes
It washs, obtained coal gas of high temperature after coal gas cooling unit and coal gas electric fishing unit by obtaining scrubbed gas and tar；
The dust-laden coal liquefaction residue that dust removing units obtain, coal liquefaction residue slurry oil return of the dust content less than 50wt% remove
Dirt unit recycles；Coal liquefaction residue slurry oil of the dust content more than or equal to 50wt% is pyrolyzed at a temperature of 600 DEG C, heat
Oil gas in solution product enters after dedusting in gas cooling system, carries out Oil-gas Separation, and pyrolysis char is realized in pyrolysis char recycling
Comprehensive utilization.
Compared with prior art, the present invention it has the following technical effect that：
(I) by the use of coal liquefaction residue as dedusting agent, efficiency of dust collection improves, and dust mixes with liquid coal liquefaction residue medium
Property it is good, be easy to trap dust.
(II) during high-temperature dust removal, the catalyst in coal liquefaction residue has heavy component in coal gas good
Catalytic pyrolysis acts on, and the coal gas after dedusting carries out pitch coal qi leel from quality of coke tar significantly improves, and light components increase again.
(III) high dust-laden coal liquefaction residue enters pyrolysis oven recycling oil gas, and dedusting does not generate disposal of pollutants.
(IV) dedusting is at low cost, and coal liquefaction residue recycles, and high dust-laden residue carries out pyrolysis comprehensive utilization, convenient for industry
Change, it is at low cost, while realize that solid waste comprehensively utilizes.
(V) equipment investment is small, simple for process, is especially suitable for removing of the solid particle less than 1 micron in coal gas.
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 attached drawing.
Specific embodiment
Specific embodiments of the present invention are given below, it should be noted 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 400 DEG C
Dust-laden heating gas and coal liquefaction residue be passed through heating melting unit in, coal liquefaction residue is heated in liquid condition, coal
Liquefied residue fusing is realized by heating unit, object of the heat source from dust-laden coal gas of the temperature higher than 400 DEG C for going out pyrolysis oven
Reason heat or external source.The temperature of coal liquefaction residue under liquid condition is in the range of 300 DEG C~360 DEG C, so
Dust-laden heating gas and the coal liquefaction residue under liquid condition are admitted to dust removing units and carry out contact washing afterwards, in dust removing units
Temperature also in the range of 300 DEG C~360 DEG C, locate coal liquefaction residue in a liquid state as dedusting medium, in dedusting list
Member is resided in the dust catching in dust-laden heating gas in coal liquefaction residue liquid, coal liquefaction by being contacted with dust-laden heating gas
Residue liquid circulation uses.
The dust-laden coal liquefaction residue that dust removing units obtain, coal liquefaction residue slurry oil return of the dust content less than 50wt% remove
Dirt unit recycles；Coal liquefaction residue slurry oil of the dust content more than or equal to 50wt% is pyrolyzed at a temperature of 600 DEG C, heat
Oil gas in solution product, which enters, carries out Oil-gas Separation after dedusting in gas cooling system, pyrolysis char recycling.
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 either indirect water-cooling or modes such as air-cooled indirectly, realize most of tar and coal gas point
From finally by coal gas electric fishing unit static tar precipitating oil, realization oil gas is kept completely separate.
The dust-laden coal liquefaction residue obtained by washing is drawn off in dust removing units bottom, and low concentration recycles, high concentration
Pyrolysis oven pyrolysis is sent into, recycles oil gas, pyrolysis char comprehensive utilization.
It using the result of the dedusting of machine oil mink cell focus and coal liquefaction residue dedusting as shown in Table 1 and Table 2, can from Tables 1 and 2
To find out：The efficiency of dust collection of coal liquefaction residue is suitable with petrochemical industry heavy oil, and coal tar dustiness is also suitable, and coal liquefaction residue is useless
Object recycles, and cost is much lower, industrially there is great application prospect.
Different medium efficiency of dust collection under the conditions of 1 same process of table
| Machine oil | 2# petrochemical industry heavy oil | Coal liquefaction residue | |
| Efficiency of dust collection/% | 99.6 | 99.8 | 99.8 |
| Tar dust-laden/% | 1.2 | 1.05 | 1.1 |
The different dedusting medium coal tar fraction compositions of table 2
| Fraction | Machine oil | 2# petrochemical industry heavy oil | Coal liquefaction residue |
| <215 DEG C/% | 17.07 | 19.01 | 22.14 |
| 215-320 DEG C/% | 31.86 | 27.94 | 47.10 |
| >320 DEG C/% | 51.07 | 53.05 | 30.76 |
| Total/% | 100.0 | 100.0 | 100.0 |
Claims (1)
1. a kind of dust removal method of pulverized coal pyrolysis coal gas of high temperature, it is characterised in that：This method specifically includes following steps：
High temperature dust heating gas is passed through and is heated in melting unit equipped with coal liquefaction residue, coal liquefaction residue is heated in liquid
Body state, then dust-laden heating gas and the coal liquefaction residue under liquid condition be admitted to dust removing units and carry out contact washing,
Obtained coal gas of high temperature after coal gas cooling unit and coal gas electric fishing unit by obtaining scrubbed gas and tar；
The dust-laden coal liquefaction residue that dust removing units obtain, coal liquefaction residue slurry oil of the dust content less than 50wt% return to dedusting list
Member recycles；Coal liquefaction residue slurry oil of the dust content more than or equal to 50wt% is pyrolyzed at a temperature of 600 DEG C, pyrolysis production
Oil gas in object, which enters, carries out Oil-gas Separation after dedusting in gas cooling system, pyrolysis char recycling；
The coal gas of high temperature obtained after the contact washing in gas cooling system by being cooled down, scrubbed gas being obtained after electric fishing
And tar；
The temperature of the dust-laden heating gas is higher than 400 DEG C；
The temperature of the coal liquefaction residue under liquid condition is in the range of 300 DEG C~360 DEG C.
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| CN201510644263.0A CN105255523B (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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| CN105255523B true CN105255523B (en) | 2018-06-26 |
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| CN106318422A (en) * | 2016-09-05 | 2017-01-11 | 神华集团有限责任公司 | Method and device for treating direct coal liquefaction residues |
| CN106590759A (en) * | 2016-12-06 | 2017-04-26 | 北京神雾环境能源科技集团股份有限公司 | Method and system for coal hydrogasification coupling calcium carbide smelting |
| CN106497594A (en) * | 2016-12-06 | 2017-03-15 | 北京神雾环境能源科技集团股份有限公司 | A kind of system and method for coal hydrogenation pyrolysis |
| CN106675596A (en) * | 2016-12-06 | 2017-05-17 | 神雾环保技术股份有限公司 | System and method for pyrolyzing biomass and liquefied residue |
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| JP2853913B2 (en) * | 1991-04-08 | 1999-02-03 | 新日本製鐵株式会社 | Manufacturing method of coke for blast furnace |
| DE19512850A1 (en) * | 1995-04-06 | 1996-10-10 | Veba Oel Technologie & Automatisierung Gmbh | Process for dedusting carbonization gas |
| CN103265978B (en) * | 2013-05-31 | 2014-07-30 | 陕西煤业化工技术研究院有限责任公司 | Integrated system and method for catalytic cracking and dust removal of medium-and-low temperature dry distillation coal 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 |
| CN104449880B (en) * | 2014-12-16 | 2018-01-09 | 新奥科技发展有限公司 | A kind of raw gas purifying method and device |
| CN104762109B (en) * | 2015-04-10 | 2018-05-01 | 陕西煤业化工集团神木天元化工有限公司 | It is pyrolyzed the group technology and device of the dedusting of coal gas and the delayed coking of mink cell focus |
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