CN103695067A - Non-bonder forming method for lignite - Google Patents
Non-bonder forming method for lignite Download PDFInfo
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- CN103695067A CN103695067A CN201310707845.XA CN201310707845A CN103695067A CN 103695067 A CN103695067 A CN 103695067A CN 201310707845 A CN201310707845 A CN 201310707845A CN 103695067 A CN103695067 A CN 103695067A
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Abstract
The invention discloses a non-bonder forming method for lignite, which belongs to processing and utilization technologies for lignite, relates to a forming method for lignite, and in particular to a forming method for weak lignite containing a high ash content and gel substances. The forming method disclosed by the invention is performed according to the following steps: (1) screening out lignite with a particle size of 0-5 mm by sieving, and drying the lignite until the water content is 5-30%; (2) preheating the dried lignite to 30-60 DEG C, and hydraulically forming the preheated lignite under 50-180 MPa; and (3) drying the formed lignite again for 1.0-6.0 hours at 50-100 DEG C to obtain a final briquette coal product. According to the forming method disclosed by the invention, the purpose of non-bonder forming for middle-aged and old lignite, in particular, weak lignite is realized; moreover, the obtained lignite is very high in cold and heat intensity, and the industrialized application range of low-value lignite is expanded.
Description
Technical field
The invention belongs to brown coal process and utilization technology, relate to Moulding Process of Brown Coal method, particularly a kind of forming method of the brown coal that are applicable to contain higher ash content and gel-like substance.
Background technology
China's lignite resource is abundant, is mainly distributed in the provinces and regions such as the Inner Mongol, northeast Dong Simeng, Yunnan, Hainan.The major industry purposes of brown coal is generating, heat supply, gasification moulding at present, extracts montanin wax, humic acids etc.Moulding Process of Brown Coal is the important measures of widening brown coal purposes.Because brown coal are moisture more, easy-weathering breaks, and volatile matter is high, and thermostability and physical strength are all very poor, and the moulding difficulty of brown coal is larger than the difficulty of hard coal moulding.
China since the fifties in last century the research of coal powder formation technology.Up to the present, China exploitation what be widely used in suitability for industrialized production is mainly having caking agent cold pressing forming process and utilizing the hot press forming technology of the cementability of coal itself for hard coal (hard coal, bituminous coal).Moulding Process of Brown Coal open source information technique of display is immature, and industrialized developing, in the experimental study stage, is not yet carried out in many places.
For example: the treatment process > > patent application of the < < powdery brown coal that publication number is CN102337167A, powdery brown coal are heated to 100～1000 ℃ and be incubated 1～5h, be cooled to afterwards, below 100 ℃, add caking agent moulding.University Of Tianjin's chemical industry is that the people such as Guo Chong great waves be take plum river brown coal and carried out the experimental study of Moulding Process of Brown Coal as raw material, this moulded coal is for atmospheric fixed bed vapourizing furnace, and research method still adopts has caking agent (Sodium salts humic acids-clay composite caking agent) cold pressing forming process for the moulding of hard coal.
" industrial shaping coal exploitation " that the people such as the Zhang Yiru of Shenyang Inst. of Environmental Science have carried out under " the Seventh Five-Year Plan " key scientific and technological projects " prevention and control of air pollution " before nineteen ninety studies sub-problem, the research purpose of this problem is for reducing environmental pollution, Moulding Process of Brown Coalization being used for to Industrial Boiler and civilian burning.The research has still adopted caking agent cold pressing forming process.
In the moulding of brown coal binder free, publication number is the < < brown coal binder free moulding > > patent application of CN1030933A, granularity is less than to 6mm, and moisture is temperature and the 1300～1800Kg/cm at 80～150 ℃ at 10～25% brown coal
2pressure under impact briquetting.The required mold temperature of the method is higher.Publication number is that the < < of CN101503641A is rich in hot press forming technology and the equipment > > patent application after water brown coal drying is processed, utilizing high pressure roll press will be rich in water brown coal processes to moisture 8～15%, granularity≤2mm, 60～90 ℃ hot-forming, forming pressure is higher, be 400～8000kN, unit length group pressure is 24～75kN/cm.Publication number is the old brown coal binder free moulding process of the < < of CN1109498A and forming machine > > patent application thereof, after packing the raw coal that is crushed to 0.5～3mm into mould, be heated to together 80～300 ℃, then be 800～2000kg/cm with pressure
2to coal extrusion forming.
The lignite molding technology of domestic contrast maturation is to have binding agent cold pressing forming process at present, and this technology is mainly used in civilian burning and atmospheric fixed bed vapourizing furnace.Though the binding agent moulding process that has of brown coal can obtain the moulded coal that intensity is higher, cost is higher.In addition, the interpolation of binding agent also can impact some equipment or the technique of use moulded coal, thus the use range of restriction moulded coal.The moulding of brown coal binder free obviously can be evaded above-mentioned shortcoming, but China's brown coal binder free moulding patent is generally had relatively high expectations to mold temperature at present, generally need be more than or equal to 80 ℃, and the hot and cold intensity of moulded coal after moulding is rarely had and mentioned, cannot data, to the briquette prod quality obtaining, judge.
Summary of the invention
Object of the present invention is intended to overcome prior art defect, and a kind of binding agent that do not need is provided, brown coal binder free forming method that just can moulding at lower temperature.Moulded coal after its moulding is steady quality after being again dried, and hot and cold intensity is very high, can meet the processing requirement of long-distance transportation, boiler combustion or Coal Chemical Industry pure oxygen gasification etc. completely.
The forming method technical scheme of brown coal binder free of the present invention is: preparation technology carries out as follows:
(1) the brown coal raw material granularity adopting is 0～5mm, and the brown coal that moisture is 5～30% are raw material, deliver to hydraulic forming machine carry out extrusion forming with certain temperature after heating;
(2) moulded coal after moulding is dried again, obtains having the moulded coal of high hot and cold strength property.
Mass percent is that 50% brown coal raw material granularity scope is 0～1mm, and the brown coal raw material granularity scope that mass percent is 50% is 1～5mm.
Brown coal Heating temperature in step (1) is 30～60 ℃.
Shaped by fluid pressure pressure in step (1) is 50～180MPa.
Brown coal obtain diameter 50mm by hydraulic forming machine, the cylindrical briquette of height 50～100mm.
Drying temperature again in step (2) is 50～100 ℃, and be 1.0～6.0 hours time of drying.
Dry moisture again in step (2) reduces to 0～5%.
Advantage of the present invention: realized brown coal, particularly contained the moulded coal manufacture of the weak brown coal in person in middle and old age's brown coal of higher ash content and gel-like substance, met transportation and industrial application requirement; Without binding agent, not only saved the technological processs such as binding agent preparation, binding agent and coal blending, and avoided binding agent to impact moulded coal cost and range of application, compared with domestic other brown coal binder free moulding patents, mold temperature required for the present invention is gentleer, 30～60 ℃.
Embodiment
Brown coal binder free forming method ammonium following steps of the present invention realize:
(1) the brown coal raw material granularity adopting is 0～5mm, and the brown coal that moisture is 5～30% are raw material, deliver to hydraulic forming machine carry out extrusion forming with certain temperature after heating;
(2) moulded coal after moulding is dried again, obtains having the moulded coal of high hot and cold strength property.
Mass percent is that 50% brown coal raw material granularity scope is 0～1mm, and the brown coal raw material granularity scope that mass percent is 50% is 1～5mm.
Brown coal Heating temperature in step (1) is 30～60 ℃.
Shaped by fluid pressure pressure in step (1) is 50～180MPa.
Brown coal obtain diameter 50mm by hydraulic forming machine, the cylindrical briquette of height 50～100mm.
Drying temperature again in step (2) is 50～100 ℃, and be 1.0～6.0 hours time of drying.
Dry moisture again in step (2) reduces to 0～5%.
The moulded coal increase of the present invention after to compacting again drying process can not only increase substantially the hot strength of moulded coal, can also reduce moisture to 0～5% of moulded coal, improved heat effect and the particular requirement of gasification to raw material of brown coal dynamic combustions, save energy.
embodiment 1
After brown coal raw material is dry at 80 ℃, crushing and screening is less than 5mm to granularity, and the brown coal redrying after screening is between moisture 10～20%.Coal dust after redrying is put into mould and be preheated to 30 ℃, with the pressure of 180MPa, carry out shaped by fluid pressure, the cold fall strength of briquette of moulded coal after moulding is 90%.Moulded coal after moulding is placed at 80 ℃ dry 4 hours, and detecting now moulded coal moisture content is 3.1%, hot fall strength of briquette be 95%, thermostability (> 13mm) is 85%.
embodiment 2
After brown coal raw material is dry at 80 ℃, crushing and screening is less than 5mm to granularity, and the brown coal redrying after screening is between moisture 5～10%.Coal dust after redrying is put into mould and be preheated to 40 ℃, with the pressure of 150MPa, carry out shaped by fluid pressure, the cold fall strength of briquette of moulded coal after moulding is 91%.Moulded coal after moulding is placed at 100 ℃ dry 1 hour, detects now moulded coal moisture content 4.9%, hot fall strength of briquette be 95%, thermostability (> 13mm) is 86%.
embodiment 3
After brown coal raw material is dry at 80 ℃, crushing and screening is less than 5mm to granularity, and the brown coal redrying after screening is between moisture 8～15%.Coal dust after redrying is put into mould and be preheated to 60 ℃, with the pressure of 50MPa, carry out shaped by fluid pressure, the cold fall strength of briquette of moulded coal after moulding is 90%.Moulded coal after moulding is placed at 50 ℃ dry 6 hours, detects now moulded coal moisture content 3.7%, hot fall strength of briquette be 92%, thermostability (> 13mm) is 83%.
Contriver has studied brown coal " self cohesiveness " problem, thinks that the important foundation of brown coal binder free moulding is that this " self cohesiveness " must just can be given full play under certain conditions, and the result of study of these conditions is innovative point of the present invention just.The all above Optimizing Technicals of the present invention are based upon on lot of experiments working foundation, the control of granularity, moisture and the Heating temperature of brown coal raw material before moulding, can mate coal intergranular relative displacement in extrusion forming process, mutually push, fricative heat reaches that brown coal studies on asphaltene is softening becomes the temperature with cohesiveness soft solid materials, coal grain is bonded together and becomes moulded coal.
In addition, the selection of binder free Moulding Process of Brown Coal technological forming pressure is very crucial, forming pressure range of choice of the present invention can make full use of and in brown coal, contain free humic acid, in moulding process, make coal intergranular close contact, make to have the intermolecular forces that the humic acids molecule of strong polarity combines at coal intergranular and strengthened and moulding.Simultaneously, the selection of brown coal raw material moisture can meet and in brown coal powder, contains a large amount of moisture pores before moulding, during moulding, pore is by conquassation, water is wherein extruded, and be covered in coal grain surface and form moisture film, and then the space of filling coal intergranular, present interactional intermolecular forces, moulded coal after moulding is by after being again dried, and moulded coal suitably shrinks the contact of having strengthened coal grain, obvious to improving moulded coal thermal stability result.
China's lignite resource distributes with northeastern Inner Mongolia area at most, accounts for 3/4 of national brown coal retained reserve, with Wei Zhu southwest, Yunnan Province brown coal reserves, accounts for 1/5 of the whole nation.Applicant adopts above-mentioned technique to carry out verification experimental verification to these the two kinds representative weak brown coal that contain higher ash content and gel-like substance, and gained moulded coal fall strength of briquette is all greater than 90% after testing, and thermostability is all greater than 80%, and effect is fine.
Claims (7)
1. a forming method for brown coal binder free, is characterized in that preparation technology carries out as follows:
(1) the brown coal raw material granularity adopting is 0～5mm, and the brown coal that moisture is 5～30% are raw material, deliver to hydraulic forming machine carry out extrusion forming with certain temperature after heating;
(2) moulded coal after moulding is dried again, obtains having the moulded coal of high hot and cold strength property.
2. the forming method of brown coal binder free according to claim 1, is characterized in that, the brown coal raw material granularity scope that mass percent is 50% is 0～1mm, and the brown coal raw material granularity scope that mass percent is 50% is 1～5mm.
3. the forming method of brown coal binder free according to claim 1, is characterized in that, the brown coal Heating temperature in step (1) is 30～60 ℃.
4. the forming method of brown coal binder free according to claim 1, is characterized in that, the shaped by fluid pressure pressure in step (1) is 50～180MPa.
5. the forming method of brown coal binder free according to claim 1, is characterized in that, brown coal obtain diameter 50mm by hydraulic forming machine, the cylindrical briquette of height 50～100mm.
6. the forming method of brown coal binder free according to claim 1, is characterized in that, the drying temperature again in step (2) is 50～100 ℃, and be 1.0～6.0 hours time of drying.
7. the forming method of brown coal binder free according to claim 1, is characterized in that, the dry moisture again in step (2) reduces to 0～5%.
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| CN201310707845.XA CN103695067A (en) | 2013-12-20 | 2013-12-20 | Non-bonder forming method for lignite |
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| CN201310707845.XA CN103695067A (en) | 2013-12-20 | 2013-12-20 | Non-bonder forming method for lignite |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104357121A (en) * | 2014-11-05 | 2015-02-18 | 云南省化工研究院 | Production method for brown coal binding and forming |
| CN105441153A (en) * | 2015-12-07 | 2016-03-30 | 北京神雾环境能源科技集团股份有限公司 | Binder-free lignite forming system and forming technology |
| CN105779059A (en) * | 2016-03-31 | 2016-07-20 | 神华集团有限责任公司 | Binder-free high-strength fine coal briquetting method |
| CN105800610A (en) * | 2016-03-31 | 2016-07-27 | 神华集团有限责任公司 | Preparing method for coal-based briquette active carbon without binding agent |
| CN108192679A (en) * | 2018-01-26 | 2018-06-22 | 上海泽玛克敏达机械设备有限公司 | A kind of moulded coal and its preparation method and application |
| JP2018168222A (en) * | 2017-03-29 | 2018-11-01 | 宇部興産株式会社 | Method for curing modified charcoal |
| CN109523177A (en) * | 2018-11-21 | 2019-03-26 | 武汉钢铁有限公司 | The method for improving coal powder formation rate and shaping strength |
| CN109628188A (en) * | 2019-01-07 | 2019-04-16 | 武汉钢铁有限公司 | The forming method of the dry coking coal of bindless |
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| US3655350A (en) * | 1970-01-02 | 1972-04-11 | Bethlehem Steel Corp | Coal pellet and a method of manufacturing same |
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| US3655350A (en) * | 1970-01-02 | 1972-04-11 | Bethlehem Steel Corp | Coal pellet and a method of manufacturing same |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104357121A (en) * | 2014-11-05 | 2015-02-18 | 云南省化工研究院 | Production method for brown coal binding and forming |
| CN105441153A (en) * | 2015-12-07 | 2016-03-30 | 北京神雾环境能源科技集团股份有限公司 | Binder-free lignite forming system and forming technology |
| CN105441153B (en) * | 2015-12-07 | 2017-11-24 | 神雾科技集团股份有限公司 | A kind of binder free Moulding Process of Brown Coal system and moulding process |
| CN105779059A (en) * | 2016-03-31 | 2016-07-20 | 神华集团有限责任公司 | Binder-free high-strength fine coal briquetting method |
| CN105800610A (en) * | 2016-03-31 | 2016-07-27 | 神华集团有限责任公司 | Preparing method for coal-based briquette active carbon without binding agent |
| CN105779059B (en) * | 2016-03-31 | 2018-10-12 | 神华集团有限责任公司 | A kind of fine coal high intensity forming method of binder free |
| JP2018168222A (en) * | 2017-03-29 | 2018-11-01 | 宇部興産株式会社 | Method for curing modified charcoal |
| JP7066326B2 (en) | 2017-03-29 | 2022-05-13 | Ｕｂｅ株式会社 | Curing method of reformed charcoal |
| CN108192679A (en) * | 2018-01-26 | 2018-06-22 | 上海泽玛克敏达机械设备有限公司 | A kind of moulded coal and its preparation method and application |
| CN109523177A (en) * | 2018-11-21 | 2019-03-26 | 武汉钢铁有限公司 | The method for improving coal powder formation rate and shaping strength |
| CN109628188A (en) * | 2019-01-07 | 2019-04-16 | 武汉钢铁有限公司 | The forming method of the dry coking coal of bindless |
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Application publication date: 20140402 |