CN102965168A - Brown coal modification and upgrading method - Google Patents
Brown coal modification and upgrading method Download PDFInfo
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- CN102965168A CN102965168A CN2012104398485A CN201210439848A CN102965168A CN 102965168 A CN102965168 A CN 102965168A CN 2012104398485 A CN2012104398485 A CN 2012104398485A CN 201210439848 A CN201210439848 A CN 201210439848A CN 102965168 A CN102965168 A CN 102965168A
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Abstract
The invention discloses a brown coal modification and upgrading method. The method comprises the following steps of: by a gas heat carrier, firstly, heating the coal to 180-300 DEG C under the condition of isolating air; and removing more than 90% of total moisture, crystal water and partial oxygen-containing functional groups which have influence on the coal heat value, and enriching the coal heating constituents, wherein the heat value is improved to be more than 500kcal/kg, the moisture content is less than 8%, and the medium-high heat value power coal index is satisfied. The modified coal has the characteristics of high heat value, excellent stability, poor water absorption property and the like; and meanwhile, in the technology, industrial water is not needed, and generation of waste water and emission of harmful gas are avoided, so that the technology is simple, economic and convenient, and is easy to generalize widely.
Description
Technical field
The invention belongs to the brown coal drying technical field, be specifically related to a kind of brown coal modification method for upgrading.
Background technology
Brown coal are the minimum coals of degree of coalification.Have the moisture content height, reach 30%～60%; Oxygen level is high, reaches 18～25%; Fixed carbon content is low, and thermal value is low, as be about 3000kca1/kg; The notable features such as easy-weathering fragmentation.Be difficult for again economically long-distance outward transport because ature of coal is poor, so that the industrial application of brown coal is take coal district as main, and how far the main brown coal place of production of China is from city and large industrial user, and its resources advantage is difficult to be converted into economic advantages.
The reason that affects the brown coal thermal value has two: the first, and non-pyrogen reduces the amount of efficient heat generation quantity of material in the unit weight brown coal, causes the brown coal thermal value to reduce; The second, full water wants adsorption heat-emitting material heat (being transformed into the latent heat of water) to become mutually water vapor in the brown coal combustion processes.Causing the brown coal thermal value to reduce the most significant is full water, is oxygen and ash secondly, so for brown coal, dehydration and deoxidation are extremely important.
Be divided into drying and upgrading, modification upgrading and destructive distillation upgrading according to raw coal quality and product requirement brown coal comprehensive utilization process.Process choice mechanism is: when coal charge moisture and ash oontent are high, semicoke product ash content is high, when purposes is limited, can first-selected dry, modification upgrading, and such as Xilinguole League's area portion brown coal.When the low ash of coal charge, low-sulfur, low-phosphorous, golf calorific value, first-selected destructive distillation upgrading.Such as the most brown coal in area, Yulin.
Mainly contain following several at industrial coal method for upgrading.Type of heating by stove can be divided into outside external-heat, internal heat type and the Nei Re hot hybrid.Wan Yongzhou etc. have introduced the drying brown coal technology such as the hot method of employing rotary pipe type, steam fluidized-bed, hot dewatering process the 91st～92 page of " coal engineering " the 8th phase in 2008.Existing technical scheme exists all that apparatus and process is complicated, drying efficiency is low, energy consumption is high, can not depth drying etc. problem so that be difficult to realize the brown coal drying production of large-scale.
At present, the technology of brown coal upgrading both at home and abroad is still not overripened, need in this area a kind of energy consumption low, without dangerous, produce and implement simple, processing power brown coal upgrading method and apparatus large and with low cost.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of brown coal modification method for upgrading, the coal after the modification has calorific value height, good stability, do not review the characteristics such as water, and technique is simple simultaneously, and is economical convenient, is easy to spread.
In order to achieve the above object, the technical scheme taked of the present invention is:
A kind of brown coal modification method for upgrading may further comprise the steps:
The first step, the raw coal from the colliery is broken into＜beans of 60mm, becomes＜5mm and two kinds of grades of 5～60mm through sieve classification;
Second step, the fine coal part of＜5mm are as the burning coal of hotblast stove, and remaining employing extrusion forming technology is compressed to moulded coal with it;
The 3rd step, moulded coal after the extrusion molding and the beans of 5～60mm are mixed into the stove dryer section, by the inertia flue gas heating from hotblast stove＜300 ℃, in the secluding air situation, coal is heated to 180 ℃～200 ℃, remove full water, the crystal water more than 90% that affect the coal calorific value, finish coal charge be heated drying and dehydrating and warm;
The 4th step, coal charge enters the modification section with the mass transport single element move, by from the inertia flue gas heating to 250 of hotblast stove＜300 ℃ ℃ ~ 300 ℃, the coal charge decomposes is deviate from the part oxygen-containing functional group, further deviate from simultaneously contained humidity in the coal charge, the coal charge calorific value increases substantially, and reaches middle high heating value steam coal index;
In the 5th step, coal charge enters cooling section after finishing upgrading, come out of the stove to＜60 ℃ from the chilled air cools of cooling blower, qualified product;
Collect after the water vapor cooling that removes in the coal, to satisfy the industrial project water demand, discharge after the expense gas cleaning.
Whole drying of the present invention, modification upgrading process are carried out in airtight body of heater, control simultaneously hot flue-gas temperature and be lower than 300 ℃, deviate from inflammable gas to generate without coal tar, guarantee production process safety with this, without explosion hazard, adopt simultaneously " two zero water conservancy project skill " not need process water, also do not produce waste water, also without noxious gas emission.
The present invention is by gaseous heat-carrier (hot-blast stove fume), in the situation of secluding air, coal is heated to 180 ℃～300 ℃, remove the full water more than 90%, crystal water and the part oxygen-containing functional group that affect the coal calorific value, make the enrichment of coal heating component, calorific value rises to more than the 5000kca1/kg, moisture content is lower than 8%, reaches middle high heating value steam coal index.Coal after the modification has calorific value height, good stability, does not review the characteristics such as water.Technique is simple, and is economical convenient, is easy to spread.
Description of drawings
Accompanying drawing is process flow sheet of the present invention.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
With reference to accompanying drawing, a kind of brown coal modification method for upgrading may further comprise the steps:
The first step, the raw coal from the colliery is broken into＜beans of 60mm, becomes＜5mm and two kinds of grades of 5～60mm through sieve classification;
Second step, the fine coal part of＜5mm are as the burning coal of hotblast stove, and remaining employing extrusion forming technology is compressed to moulded coal with it;
The 3rd step, moulded coal after the extrusion molding and the beans of 5～60mm are mixed into the stove dryer section, by the inertia flue gas heating from hotblast stove＜300 ℃, in the secluding air situation, coal is heated to 180 ℃～200 ℃, remove full water, the crystal water more than 90% that affect the coal calorific value, finish coal charge be heated drying and dehydrating and warm;
The 4th step, coal charge enters the modification section with the mass transport single element move, by from the inertia flue gas heating to 250 of hotblast stove＜300 ℃ ℃～300 ℃, the coal charge decomposes is deviate from the part oxygen-containing functional group, further deviate from simultaneously contained humidity in the coal charge, the coal charge calorific value increases substantially, and reaches middle high heating value steam coal index;
In the 5th step, coal charge enters cooling section after finishing upgrading, come out of the stove to＜60 ℃ from the chilled air cools of cooling blower, qualified product;
Collect after the water vapor cooling that removes in the coal, to satisfy the industrial project water demand, discharge after the expense gas cleaning.
Whole drying of the present invention, modification upgrading process are carried out in airtight body of heater, control simultaneously hot flue-gas temperature and be lower than 300 ℃, deviate from inflammable gas to generate without coal tar, guarantee production process safety with this, without explosion hazard, adopt simultaneously " two zero water conservancy project skill " not need process water, also do not produce waste water, also without noxious gas emission.
Claims (2)
1. a brown coal modification method for upgrading is characterized in that, may further comprise the steps:
The first step, the raw coal from the colliery is broken into＜beans of 60mm, becomes＜5mm and two kinds of grades of 5～60mm through sieve classification;
Second step, the fine coal part of＜5mm are as the burning coal of hotblast stove, and remaining employing extrusion forming technology is compressed to moulded coal with it;
The 3rd step, moulded coal after the extrusion molding and the beans of 5～60mm are mixed into the stove dryer section, by the inertia flue gas heating from hotblast stove＜300 ℃, in the secluding air situation, coal is heated to 180 ℃～200 ℃, remove full water, the crystal water more than 90% that affect the coal calorific value, finish coal charge be heated drying and dehydrating and warm;
The 4th step, coal charge enters the modification section with the mass transport single element move, by from the inertia flue gas heating to 250 of hotblast stove＜300 ℃ ℃～300 ℃, the coal charge decomposes is deviate from the part oxygen-containing functional group, further deviate from simultaneously contained humidity in the coal charge, the coal charge calorific value increases substantially, and reaches middle high heating value steam coal index;
In the 5th step, coal charge enters cooling section after finishing upgrading, come out of the stove to＜60 ℃ from the chilled air cools of cooling blower, qualified product;
Collect after the water vapor cooling that removes in the coal, to satisfy the industrial project water demand, discharge after the expense gas cleaning.
2. a kind of brown coal modification method for upgrading according to claim 1, it is characterized in that: whole drying of the present invention, modification upgrading process are carried out in airtight body of heater, control simultaneously hot flue-gas temperature and be lower than 300 ℃, deviate from inflammable gas to generate without coal tar, guarantee production process safety with this, without explosion hazard, adopt simultaneously " two zero water conservancy project skill " not need process water, also do not produce waste water, without noxious gas emission yet.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103225804A (en) * | 2013-05-21 | 2013-07-31 | 吕伟鹏 | Method for combusting lignite in rotary kiln under high temperature |
| CN104419492A (en) * | 2013-09-04 | 2015-03-18 | 佐藤邦道 | Calorific value increasing method of low-calorific value coal |
| CN104850755A (en) * | 2015-06-03 | 2015-08-19 | 上海明华电力技术工程有限公司 | Combustion stability determining method based on thermal decomposition |
| CN108534471A (en) * | 2018-04-13 | 2018-09-14 | 佛山市尚柏科技有限公司 | A kind of mud coal drying means |
| CN108759313A (en) * | 2018-06-14 | 2018-11-06 | 中国矿业大学 | A kind of brown coal drying-dry separation collaboration optimization method for upgrading and technique |
| CN108795527A (en) * | 2018-06-14 | 2018-11-13 | 中国矿业大学 | A kind of low-quality coal drying-dry separation collaboration optimization method for upgrading and technique |
| CN110540885A (en) * | 2019-09-11 | 2019-12-06 | 山西领君重工机械设备有限公司 | Drying-free forming method for molded coal |
| CN113416588A (en) * | 2021-06-08 | 2021-09-21 | 太原理工大学 | Dehydration and passivation process of lignite |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101260307A (en) * | 2008-04-18 | 2008-09-10 | 清华大学 | Brown coal drying quality-increasing device and technique |
| CN101792686A (en) * | 2010-02-11 | 2010-08-04 | 天地科技股份有限公司唐山分公司 | Lignite drying and screening forming process and drying and screening device thereof |
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2012
- 2012-11-07 CN CN2012104398485A patent/CN102965168A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101260307A (en) * | 2008-04-18 | 2008-09-10 | 清华大学 | Brown coal drying quality-increasing device and technique |
| CN101792686A (en) * | 2010-02-11 | 2010-08-04 | 天地科技股份有限公司唐山分公司 | Lignite drying and screening forming process and drying and screening device thereof |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103225804A (en) * | 2013-05-21 | 2013-07-31 | 吕伟鹏 | Method for combusting lignite in rotary kiln under high temperature |
| CN103225804B (en) * | 2013-05-21 | 2015-04-08 | 吕伟鹏 | Method for combusting lignite in rotary kiln under high temperature |
| CN104419492A (en) * | 2013-09-04 | 2015-03-18 | 佐藤邦道 | Calorific value increasing method of low-calorific value coal |
| CN104850755A (en) * | 2015-06-03 | 2015-08-19 | 上海明华电力技术工程有限公司 | Combustion stability determining method based on thermal decomposition |
| CN104850755B (en) * | 2015-06-03 | 2017-11-03 | 上海明华电力技术工程有限公司 | A kind of combustion stability determination methods based on thermal decomposition |
| CN108534471A (en) * | 2018-04-13 | 2018-09-14 | 佛山市尚柏科技有限公司 | A kind of mud coal drying means |
| CN108759313A (en) * | 2018-06-14 | 2018-11-06 | 中国矿业大学 | A kind of brown coal drying-dry separation collaboration optimization method for upgrading and technique |
| CN108795527A (en) * | 2018-06-14 | 2018-11-13 | 中国矿业大学 | A kind of low-quality coal drying-dry separation collaboration optimization method for upgrading and technique |
| CN108759313B (en) * | 2018-06-14 | 2019-10-29 | 中国矿业大学 | A kind of brown coal drying-dry separation collaboration optimization method for upgrading and technique |
| CN110540885A (en) * | 2019-09-11 | 2019-12-06 | 山西领君重工机械设备有限公司 | Drying-free forming method for molded coal |
| CN113416588A (en) * | 2021-06-08 | 2021-09-21 | 太原理工大学 | Dehydration and passivation process of lignite |
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Application publication date: 20130313 |