CN104388136B - The method of coal water slurry is prepared in hot semicoke cooling - Google Patents
The method of coal water slurry is prepared in hot semicoke cooling Download PDFInfo
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- CN104388136B CN104388136B CN201410657099.2A CN201410657099A CN104388136B CN 104388136 B CN104388136 B CN 104388136B CN 201410657099 A CN201410657099 A CN 201410657099A CN 104388136 B CN104388136 B CN 104388136B
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Abstract
The invention discloses a kind of method that coal water slurry is prepared in hot semicoke cooling, solve the problem of the slurry concentration difference that existing semicoke cooling preparation coal water slurry exists.Technical scheme comprises by the 500-700 DEG C of hot semicoke obtained after low-rank coal pyrolysis, and adopt dry coke quenching mode to be cooled fast to less than 60 DEG C the hot semicoke of 500-700 DEG C, then precrushing is to below 10mm, the more levigate preparation coal water slurry that adds water to below 1mm.The hot semicoke that the present invention is prepared with low-rank coal obtains high-quality semicoke after dry coke quenching cooling, dry coke quenching product slurry performance is better than water quenching, slurry concentration can improve 5-7 percentage point, has technique simple, production cost and the advantage that running cost is low, slurry concentration is high.
Description
Technical field
The present invention relates to a kind of coal chemical technology, the method for coal water slurry is prepared in a kind of hot semicoke cooling specifically.
Background technology
Along with the high coal that goes bad is used fewer and fewer, the high-efficiency cleaning of low-rank coal utilizes and shows important day.Present stage, the prescription method of low-rank coal normally formed hot semicoke by after its pyrolysis.End 2013, low-rank coal upgrading technology is more than 20 kinds, and wherein 13 kinds of pyrolytic techniques are in construction, trial run stage, and the extensive efficiency utilization of low order improving quality of coal by pyrolysis solid phase prod is the large problem that people face.
Form hot semicoke by after low stage pyrolysis, hot semicoke after needing cooling the levigate fuel that can be used as use, as directly as coal dust firing or be mixed with coal water slurry.
For a long time, the cooling of hot semicoke adopts water quenching.The method water loss of water quenching is large, and, when hot semicoke is for the preparation of coal water slurry, adopt water coke quenching method can make hot semicoke, with after water or water vapour contact, chemical reaction occur, not only can produce dust-laden exhaust gas contaminate environment, and this contact with water after semicoke structures and characteristics change, quality reduce, the effect that simultaneously relapses causes semicoke moisture significantly to increase, and reduces slurry concentration.
Summary of the invention
The object of the invention is to solve the problems of the technologies described above, providing that a kind of technique is simple, the method for coal water slurry is prepared in the hot semicoke cooling of high, the effective raising of coal water slurry slurry concentration hot semicoke degree of coalification.
Technical scheme comprises by the 500-700 DEG C of hot semicoke obtained after low-rank coal pyrolysis, and adopt dry coke quenching mode to be cooled fast to less than 60 DEG C the hot semicoke of 500-700 DEG C, then precrushing is to below 10mm, the more levigate preparation coal water slurry that adds water to below 1mm.
Adopt ball mill to carry out fine grinding, the diameter proportioning of steel ball is 20mm, 12mm and 5mm, and quality proportioning corresponds to 20%:50%:30%, and drum's speed of rotation is set in 150-200r/min, coal-grinding time 3-5min.
Stir preparation coal water slurry after adding water, adopt high speed electric agitator to stir, rotating speed is set to 1000r/min, and churning time controls at 15-20min.
Also add slurries additive agent during described preparation coal water slurry, described slurries additive agent addition is 0.3% of semicoke quality.Described slurries additive agent take xylogen as main raw material, the ZM-19 High-efficient Water slurry additive that Chemical Co., Ltd. as Central-South in Changzhou produces.
Described dry coke quenching mode be inertia dry gas with the direct or indirect heat exchange of hot semicoke, or liquid low temperature medium is with hot semicoke indirect heat exchange.
Semicoke granularity being less than 1mm, with 1mm ~ 0.071mm and the two kinds of size ranges being less than 0.071mm, carries out grating with mass ratio 6:4, and then the preparation coal water slurry that adds water.
Dry quenching method carries out the heat exchange between hot cold medium by physics mode, effectively can improve semicoke speed of cooling, Quick stop pyrolytic reaction, increase the impellent that pyrolysis gas is overflowed in coal particle simultaneously.Choosing of this quenching mode is not simple improvement, which obviate water quenching or aqueous vapor quenching to the change of semicoke character, because water quenching or aqueous vapor quenching, with semicoke, slight gasification reaction can occur, reduce the quality of semicoke, change the pore texture of semicoke and increase the water content of semicoke.Dry coke quenching reduces the water content in semicoke to greatest extent, maintains the regularity of semicoke pore structure, reaches the effect improving degree of coalification.This is for taking low-rank coal as the hot semicoke of raw material production, and reducing the usage quantity of slurries additive agent, it is very necessary for improving slurry concentration.
On the other hand, adopt dry quenching method cooling heat semicoke, the microcrystalline coating sheet structure of the rule relatively that semicoke in pyrolytic process can be kept to be formed, improve pore size distribution, follow-up semicoke fragmentation and levigate becoming are more prone to, and grindability index improves, and reduces the energy consumption of coal pulverizer.By controlling the diameter proportioning of steel ball, quality proportioning and drum's speed of rotation and coal-grinding time, making semicoke effectively can be milled to below 1mm, ensureing pulping effect.
Contriver finds further, the semicoke after levigate is carried out grating and can improve slurry concentration further, and the semicoke preferably granularity being less than 1mm, with 1mm ~ 0.071mm and the two kinds of size ranges being less than 0.071mm, carries out grating with mass ratio 6:4.
Beneficial effect:
The hot semicoke that the present invention is prepared with low-rank coal obtains high-quality semicoke after dry coke quenching cooling, dry coke quenching product slurry performance is better than water quenching, slurry concentration can improve 4-6 percentage point, has technique simple, production cost and the advantage that running cost is low, slurry concentration is high.
Embodiment
Embodiment:
Embodiment 1, initial temperature be 500 DEG C of hot semicokes with stream of nitrogen gas direct heat exchange, be cooled fast to less than 60 DEG C.The semicoke of cooling is crushed to below 10mm in advance, and use ball mill to carry out coal-grinding, the diameter proportioning of steel ball is 20mm, 12mm and 5mm, and quality proportioning is 20%:50%:30%, and drum's speed of rotation is set in 170r/min, coal-grinding time 3min.Semicoke uses 1mm sieve to sieve, and be less than 1mm coal dust and add water and mix, the agitator re-using rotating speed 1000r/min stirs 15-20min, is finally prepared into embodiment coal water slurry.The results are shown in Table 1.
Embodiment 2, initial temperature be 520 DEG C of hot semicokes with stream of nitrogen gas direct heat exchange, be cooled fast to less than 60 DEG C.The semicoke of cooling is crushed to below 10mm in advance, and use ball mill to carry out coal-grinding, the diameter proportioning of steel ball is 20mm, 12mm and 5mm, and quality proportioning is 20%:50%:30%, and drum's speed of rotation is set in 200r/min, coal-grinding time 5min.Semicoke uses 1mm sieve to sieve, be less than 1mm coal dust add water and additive (ZM-19 High-efficient Water slurry additive, consumption is 0.3%, wt of semicoke) and mix, the agitator re-using rotating speed 1000r/min stirs 15-20min, is finally prepared into embodiment coal water slurry.The results are shown in Table 1.
Embodiment 3, initial temperature be 700 DEG C of hot semicokes with stream of nitrogen gas direct heat exchange, be cooled fast to less than 60 DEG C.The semicoke of cooling is crushed to below 10mm in advance, ball mill is used to carry out coal-grinding, the diameter proportioning of steel ball is 20mm, 12mm and 5mm, quality proportioning is 20%:50%:30%, drum's speed of rotation is set in 150r/min, coal-grinding time 4min, levigate rear coal dust uses 1mm and 0.071mm sieve to sieve, granularity 1mm ~ 0.071mm (coarse grain) and the coal being less than 0.071mm (particulate) carry out grating by the mass ratio of 6:4, then water and additive (ZM-19 High-efficient Water slurry additive is added, consumption is the 0.3%wt of semicoke) and mix the agitator stirring 15-20min re-using rotating speed 1000r/min, finally be prepared into embodiment coal water slurry.The results are shown in Table 1.
Comparative example 1, initial temperature is that 520 DEG C of hot semicokes are uniform in thin layer in rotary hearth furnace, cools after the shower nozzle that top is arranged makes water fogging to semicoke.Discharge port semicoke temperature about 100 DEG C.The semicoke of cooling is crushed to below 10mm in advance, and use ball mill to carry out coal-grinding sample preparation, the diameter proportioning of steel ball is 20mm, 12mm and 5mm, and quality proportioning is 20%:50%:30%, and drum's speed of rotation is set in 170r/min, coal-grinding time 3min.Coal sample uses 1mm sieve to sieve, and be less than 1mm coal sample and add water and mix, the agitator re-using rotating speed 1000r/min stirs 15-20min, is finally prepared into embodiment coal water slurry sample.The results are shown in Table 1.
Described in embodiment 1-3 and comparative example 1, hot semicoke selects the hot semicoke of Inner Mongol brown coal pyrolysis gained.
Table 1 coal water slurry slurry performance
Remarks:
1. liquidity analysis adopt appearance method, be divided into excellent, good, in, differ from four grades.Excellent: smooth flow, uninterruptedly, good: to flow not smooth, have interruption, in: can not independently toward dirty, need by external force, poor: clustering phenomena is serious.
2. stability analysis adopt rod insert observation, coal water slurry sample is left standstill more than 12h and analyzes, be divided into excellent, good, in, differ from four grades.Excellent: without bleed, without precipitation, good: slight bleed, precipitate a little, in: precipitation is serious, poor: caking.
In table 1, dry coke quenching product best slurry concentration presents good mobility and stability at 65% (wt).Embodiment dry coke quenching product prepares the requirement that the concentration of coal water slurry, apparent viscosity, mobility and stability all meet coal water slurry gasification technology, and is better than comparative example.The dry coke quenching product slurry concentration that the embodiment of the present invention obtains, compared to the slurry concentration of comparative example water quenching, improves 5-7 percentage point, Be very effective.
Claims (5)
1. a hot semicoke cools the method preparing coal water slurry, comprise by the 500-700 DEG C of hot semicoke obtained after low-rank coal pyrolysis, it is characterized in that, dry coke quenching mode is adopted to be cooled fast to less than 60 DEG C the hot semicoke of 500-700 DEG C, then precrushing is to below 10mm, the levigate preparation coal water slurry that adds water to below 1mm, also adds slurries additive agent during described preparation coal water slurry again, and described slurries additive agent addition is 0.3% of semicoke quality.
2. the method for coal water slurry is prepared in hot semicoke cooling as claimed in claim 1, it is characterized in that, adopts ball mill to carry out fine grinding, the diameter proportioning of steel ball is 20mm, 12mm and 5mm, quality proportioning is 20%:50%:30%, and drum's speed of rotation is set in 150-200r/min, coal-grinding time 3-5min.
3. the method for coal water slurry is prepared in hot semicoke cooling as claimed in claim 1, and it is characterized in that, stir preparation coal water slurry after adding water, adopt high speed electric agitator to stir, rotating speed is set to 1000r/min, and churning time controls at 15-20min.
4. the method for coal water slurry is prepared in the hot semicoke cooling as described in any one of claim 1-3, it is characterized in that, described dry coke quenching mode be inertia dry gas with the direct or indirect heat exchange of hot semicoke, or liquid low temperature medium is with hot semicoke indirect heat exchange.
5. the method for coal water slurry is prepared in hot semicoke cooling as claimed in claim 1, it is characterized in that, semicoke granularity being less than 1mm, with 1mm ~ 0.071mm and the two kinds of size ranges being less than 0.071mm, carries out grating with mass ratio 6:4, and then the preparation coal water slurry that adds water.
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| CN105062583B (en) * | 2015-07-10 | 2017-10-27 | 中国矿业大学(北京) | A kind of method that dry coal dust prepares gasified coal water slurry with semicoke |
| CN106492965A (en) * | 2016-12-16 | 2017-03-15 | 北京神雾电力科技有限公司 | A kind of high-temperature semi-coke grinds system and grinding method |
| CN107189832B (en) * | 2017-06-20 | 2019-02-26 | 新奥科技发展有限公司 | A kind of preparation method of water coke slurry |
| CN114702991A (en) * | 2022-04-19 | 2022-07-05 | 中国矿业大学 | Method for preparing coal water slurry by matching low-rank coal low-temperature pyrolysis semicoke with non-caking coal |
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| CN101323803A (en) * | 2008-07-16 | 2008-12-17 | 大连理工大学 | Method for preparing water coke slurry from lignite char |
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