CN105112079A - Coal quality-improving method free of waste water discharge - Google Patents
Coal quality-improving method free of waste water discharge Download PDFInfo
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- CN105112079A CN105112079A CN201510591768.5A CN201510591768A CN105112079A CN 105112079 A CN105112079 A CN 105112079A CN 201510591768 A CN201510591768 A CN 201510591768A CN 105112079 A CN105112079 A CN 105112079A
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Abstract
The invention discloses a coal quality-improving method free of waste water discharge. The coal quality-improving method comprises the following steps of performing drying treatment on raw coal, so as to obtain dry coal at 150-200 DEG C; performing pyrolysis treatment on the dry coal, so as to obtain semicoke at 400-600 DEG C; performing quenching treatment on the semicoke and lowering the temperature of the semicoke to 50-150 DEG C; and performing cooling treatment on the semicoke. According to the coal quality-improving method, water in low-rank coal can be removed, the process is economical; process waste water generated due to the coal quality improvement is recycled is not discharged, and process gas can be recycled or sold.
Description
Technical field
The present invention relates to a kind of low-rank coal method for upgrading, particularly relate to a kind of coal method for upgrading of non-wastewater discharge.
Background technology
At present, the coal reserves of China accounts for 12% of worldwide coal resource, the low-rank coal standing stock of China account for about 50% of coal reserves, output accounts for 30% of current total amount, in areal distribution, reserves major part concentrates on the Inner Mongol, Shaanxi, Xinjiang, Gansu, Shanxi, six, Ningxia province (district), see by the forming age of CHINESE COAL, maximum with Jurassic Coal reserves, account for the whole nation and verify about 45% of retained reserve, the coal formed by these epoch is except only a few hard coal, all the other great majority are brown coal, long-flame coal, the low-rank coal such as non-caking coal and weakly caking coal.Brown coal are pit coals that degree of coalification is minimum, a kind of brownish black, lacklustre grizzle between peat and pitch coal.Be rich in volatile matter, be easy to burn and smolder.World's lignite resource amount accounts for 1/3 of world's coal resources total amount.China's brown coal reserves also account for more than 1/8 of national coal total reserves, and being mainly distributed in east Inner Mongolia, Eastern Yunnan, northeast and south China also has on a small quantity.
Brown coal are due to high-moisture, low-calorie feature, the cost of transportation cost and fuel container can be increased, thus be unsuitable for long-distance transportation and as fuel combustion, be considered a kind of low-grade coal resource for a long time, only be used as pit-head power station fuel and near coal-mine gasified raw material at present, limit the rational exploitation and utilization of lignite resource.
Mainly there is the shortcoming of following several respects in the process of existing coal method for upgrading:
1) coal upgrading produces a large amount of waste water, and needing increases wastewater treatment measure;
2) process gas utilizes not exclusively.
Summary of the invention
The object of the present invention is to provide a kind of can the coal method for upgrading of non-wastewater discharge of utilization process water and process gas.
For achieving the above object, the concrete technical scheme of the coal method for upgrading of a kind of non-wastewater discharge of the present invention is:
A coal method for upgrading for non-wastewater discharge, comprises the following steps:
Drying, carries out drying treatment to raw coal, to obtain the moisture-free coal that temperature is 150-200 DEG C;
Pyrolysis, carries out pyrolysis processing to moisture-free coal, to obtain the semicoke that temperature is 400-600 DEG C;
Quenching, carries out quenching process to semicoke, makes the temperature of semicoke be reduced to 50-150 DEG C;
Cooling, carries out cooling process to semicoke.
Further, semicoke and process water can be produced in pyrolysis step simultaneously, the process water produced is collected, for carrying out quenching process to semicoke in quenching step.
Further, utilize process water to carry out producing process gas in the step of quenching process to semicoke, the process gas produced is collected, and the process gas collected is passed in coal dust washer, obtain pure process gas to remove coal dust.
Further, the process gas removed after coal dust through coal dust washer is passed in steam condenser, condensation process is carried out to process gas, with formation process water.
Further, remaining after condensation process process gas can be used for the pyrolysing fuel in pyrolysis step.
Further, precooling treatment is carried out to the semicoke after quenching.
Further, carry out rehydrated process to the semicoke after precooling, semicoke can combine with process water, to form the semicoke that water-content is 5-15%.
Further, the semicoke after rehydrated process to be cooled successively, surface oxidation and cooling process again, to form the semicoke of high heating value.
The advantage of the coal method for upgrading of a kind of non-wastewater discharge of the present invention is:
1) can by the water removing in low-rank coal, technique is economy comparatively;
2) processing wastewater of coal upgrading generation is recycling, without outer row;
3) process gas recycling capable of circulation or sale.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the coal method for upgrading of a kind of non-wastewater discharge of the present invention.
Embodiment
In order to better understand object of the present invention, structure and function, below in conjunction with accompanying drawing, further detailed description is done to the coal method for upgrading of a kind of non-wastewater discharge of the present invention.
As shown in Figure 1, it shows the coal method for upgrading for non-wastewater discharge of the present invention, for carrying out drying and pyrolysis to low-rank coal, moisture in removing low-rank coal and hydrocarbon polymer, comprise the following steps: drying step, carry out convective heating drying by the hot blast in drying oven to raw coal, removing moisture, obtains moisture-free coal; Pyrolysis step, enters pyrolysis oven and carries out to moisture-free coal the semicoke that pyrolysis processing forms high temperature, and collect the process water that pyrolysis produces; Quenching step, the process water collected in pyrolysis step can be utilized in Quench dish to carry out quenching process to semicoke, and quenching process makes the temperature of semicoke be reduced to 50-150 DEG C, and can produce process gas; Cooling step, carries out cooling process to semicoke.
Further, in drying step, dried moisture-free coal temperature is 150 DEG C-200 DEG C, also may remain portion of water in drying process.
Further, in pyrolysis step, by pyrolysis oven, moisture-free coal is carried out pyrolysis, the moisture that removing is residual, wherein the moisture-free coal pyrolysis of a part creates the semicoke that process water and temperature are 400-600 DEG C, another part is not remained in pyrolysis oven by the moisture-free coal of pyrolysis and waits for next pyrolysis, collects, for carrying out quenching process to semicoke in quenching step the process water produced.。
Further, can the process gas produced after quenching process be passed in coal dust washer, obtain pure process gas to remove coal dust.The process gas removed after coal dust through coal dust washer is passed in steam condenser, condensation process is carried out to process gas, formation process water, and process water is collected,, can merge with the technique aqueous phase that produces in the process water that produces in above-mentioned pyrolysis step and quenching step.Have the remaining process gas being insoluble to process water in vapor condensation process, this process gas can be passed into pyrolysis step as fuel semicoke being carried out to pyrolysis.
Further, cooling step comprises precooling, carries out precooling treatment to the semicoke after quenching.In addition, cooling step comprises rehydrated, rehydrated process is carried out to the semicoke after precooling and process water, the process water collected after process water after this process water can be pyrolysis processing, quenching, also can be process water process gas condensation formed by steam condenser, also can be the process water merged.Wherein, the moisture content of the semicoke after rehydrated process is 5%-15%.
Further, also comprise cooling, surface oxidation in cooling step and cool again, to through precooling, rehydrated after semicoke cool successively, surface oxidation and cooling process again, to form high heating value, Stable Carbon material or stable semicoke.
Be described below in conjunction with the working process of accompanying drawing to the coal method for upgrading of a kind of non-wastewater discharge of the present invention:
First, need the low-rank coal of upgrading to enter in drying oven and carry out drying treatment, obtain the moisture-free coal being about 180 DEG C; Moisture-free coal enters in pyrolysis oven and carries out pyrolysis by the process gas of collecting, and obtains the semicoke being about 500 DEG C, and produces process water; The process water utilizing pyrolysis to produce carries out quenching process to semicoke in Quench dish, obtains the semicoke being about 100 DEG C, and produces process gas; Precooling treatment is carried out to the semicokes of 100 DEG C.
Wherein, the process water produced in above-mentioned steps and process water are collected, utilize process water to carry out producing process gas in the step of quenching process to semicoke, this process gas can be passed in coal dust washer, remove coal dust, to collect pure process gas.Remove coal dust by coal dust washer, then carry out condensation by steam condenser to process gas, formation process water, remaining water-fast process gas returns in pyrolysis oven, and as the fuel of pyrolysis moisture-free coal, the semicoke after process water and precooling carries out rehydrated process.
Finally, successively after pre-cold-peace is rehydrated, by the water coolant of convection current, semicoke is cooled; Oxide treatment is carried out to semicoke, is oxidized by the surface of drying oven to semicoke; By the water coolant of convection current, semicoke is cooled again, obtain the semicoke of high heating value.
The coal method for upgrading of a kind of non-wastewater discharge of the present invention, can by the water removing in low-rank coal, and technique is economy comparatively; The processing wastewater that coal upgrading produces is recycling, without outer row; Process gas recycling capable of circulation or sale.
Further describe invention has been by specific embodiment above; but it should be understood that; here concrete description; should not be construed as the restriction to the spirit and scope of the invention; one of ordinary skilled in the art to the various amendments that above-described embodiment is made, belongs to the scope that the present invention protects after reading this specification.
Claims (8)
1. a coal method for upgrading for non-wastewater discharge, is characterized in that, comprise the following steps:
Drying, carries out drying treatment to raw coal, to obtain the moisture-free coal that temperature is 150-200 DEG C;
Pyrolysis, carries out pyrolysis processing to moisture-free coal, to obtain the semicoke that temperature is 400-600 DEG C;
Quenching, carries out quenching process to semicoke, makes the temperature of semicoke be reduced to 50-150 DEG C;
Cooling, carries out cooling process to semicoke.
2. the coal method for upgrading of non-wastewater discharge according to claim 1, is characterized in that, can produce semicoke and process water simultaneously, collect, for carrying out quenching process to semicoke in quenching step the process water produced in pyrolysis step.
3. the coal method for upgrading of non-wastewater discharge according to claim 2, it is characterized in that, process water is utilized to carry out producing process gas in the step of quenching process to semicoke, the process gas produced is collected, and the process gas collected is passed in coal dust washer, obtain pure process gas to remove coal dust.
4. the coal method for upgrading of non-wastewater discharge according to claim 3, is characterized in that, is passed in steam condenser, carries out condensation process, with formation process water to process gas by the process gas removed after coal dust through coal dust washer.
5. the coal method for upgrading of non-wastewater discharge according to claim 4, is characterized in that, process gas remaining after condensation process can be used for the pyrolysing fuel in pyrolysis step.
6. the coal method for upgrading of non-wastewater discharge according to claim 2, is characterized in that, carries out precooling treatment to the semicoke after quenching.
7. the coal method for upgrading of non-wastewater discharge according to claim 6, is characterized in that, carries out rehydrated process to the semicoke after precooling, and semicoke can combine with process water, to form the semicoke that water-content is 5-15%.
8. the coal method for upgrading of non-wastewater discharge according to claim 7, is characterized in that, cools successively, surface oxidation and cooling process again to the semicoke after rehydrated process, to form the semicoke of high heating value.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107652996A (en) * | 2017-08-01 | 2018-02-02 | 宁夏科豪陶瓷有限公司 | A kind of method washed and dry coal |
| CN114517116A (en) * | 2022-02-14 | 2022-05-20 | 三门峡市精捷自动化设备有限公司 | Low-volatile coal body thermal steaming and cold quenching process |
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| CN101429463A (en) * | 2007-11-06 | 2009-05-13 | 湖南大唐先一科技有限公司 | Process for processing coal with low degree of metamorphism |
| WO2014014092A1 (en) * | 2012-07-20 | 2014-01-23 | 新日鐵住金株式会社 | Coal upgrading method and coal upgrading device |
| CN103980975A (en) * | 2014-05-29 | 2014-08-13 | 湖南华银能源技术有限公司 | Passivating device and method for semicoke |
| CN103980973A (en) * | 2014-05-26 | 2014-08-13 | 湖南华银能源技术有限公司 | Semicoke passivating method |
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2015
- 2015-09-17 CN CN201510591768.5A patent/CN105112079A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101429463A (en) * | 2007-11-06 | 2009-05-13 | 湖南大唐先一科技有限公司 | Process for processing coal with low degree of metamorphism |
| WO2014014092A1 (en) * | 2012-07-20 | 2014-01-23 | 新日鐵住金株式会社 | Coal upgrading method and coal upgrading device |
| CN103980973A (en) * | 2014-05-26 | 2014-08-13 | 湖南华银能源技术有限公司 | Semicoke passivating method |
| CN103980975A (en) * | 2014-05-29 | 2014-08-13 | 湖南华银能源技术有限公司 | Passivating device and method for semicoke |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107652996A (en) * | 2017-08-01 | 2018-02-02 | 宁夏科豪陶瓷有限公司 | A kind of method washed and dry coal |
| CN114517116A (en) * | 2022-02-14 | 2022-05-20 | 三门峡市精捷自动化设备有限公司 | Low-volatile coal body thermal steaming and cold quenching process |
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