CN102796581A - Drying pretreatment method for lignite - Google Patents
Drying pretreatment method for lignite Download PDFInfo
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- CN102796581A CN102796581A CN2011101374569A CN201110137456A CN102796581A CN 102796581 A CN102796581 A CN 102796581A CN 2011101374569 A CN2011101374569 A CN 2011101374569A CN 201110137456 A CN201110137456 A CN 201110137456A CN 102796581 A CN102796581 A CN 102796581A
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Abstract
The invention relates to a drying pretreatment method for lignite. The method comprises the following steps of: 1, crushing and screening raw lignite; 2. performing magnetic separation on the screened lignite granules to remove ferromagnetic substances in the lignite granules; and 3, performing drying pretreatment on the lignite granules by adopting different modes according to different types of waste heat in the magnetically separated lignite granule conveying process, and preferably treating tail gas. After the drying pretreatment of the lignite, the water content of the lignite is less than 20 percent. The drying pretreatment method for the lignite has the advantages of energy conservation, environment friendliness, high lignite drying efficiency and the like.
Description
Technical field
The present invention relates to a kind of brown coal drying method, particularly a kind of brown coal drying pretreatment process.It belongs to fast energy-saving, the deep dehydration field of drying and upgrading field, the especially brown coal of brown coal.
Background technology
The brown coal reserves account for about 15% of coal in China total reserves, are a kind of main coal resources of China.Play an important role at China's electric power and chemical industry with coal.Brown coal belong to the low coal of a kind of degree of coalification.Its moisture content is 20%～50% mostly.Brown coal have flourishing hole and surface, so active high, water-absorbent is strong.Brown coal directly are used for power plant's generating because of its calorific value is low and difficult.The high moisture content of brown coal also makes it be inappropriate for remote transportation simultaneously, and this also is one of bottleneck that restricts for a long time the lignite resource utilization.And pass through the moisture that drying treatment reduces coal, and can improve calorific value and energy density on the one hand, reduce transportation cost, can also improve the utilising efficiency of downstream unit on the other hand, reduce equipment scale.
Present China is fewer for the brown coal Technology Research of Dehydration, and abroad to the existing century-old history of this research, it is technological to have formed the sophisticated drying and dehydrating of many covers.Main brown coal dehydration technique has both at home and abroad: hot dried dehydration technique, HTHP dehydration technique, cold dried dehydration technique and vacuum expansion dehydration technique etc.These brown coal drying and dehydrating technology are bigger owing to consuming energy, complex equipments, and many places are in the scale demonstration phase, and the complicacy and the stable problem of operation have hindered these process scale application.
Process method is simple, energy-conserving and environment-protective, and equipment is simple, stable, and the efficient brown coal drying technology of can maximize, mass-producing being used is the main direction of research and development always.
Summary of the invention
The objective of the invention is the complex equipments to existing brown coal drying method existence, energy consumption is high, etc. problem, has proposed to utilize a kind of brown coal drying pretreatment process of residual heat of electric power plant.
For realizing the foregoing invention purpose, technical scheme provided by the invention is:
A kind of brown coal drying pretreatment process, it may further comprise the steps:
Step 1: raw coal is carried out fragmentation and screening;
Step 2: the coal particle to after the screening carries out magnetic separation, so that get rid of the ferromagnetic material in the coal particle;
Step 3: in the process of the coal particle after carrying magnetic separation,, adopt different modes that coal particle is carried out dry pre-treatment according to dissimilar waste heats; And preferably tail gas is handled.
Preferably; In step 3; Said coal particle is through horizontal moving bed conveying, and move horizontally travelling belt and hot blast chamber said horizontal moving bed comprising, the wherein said travelling belt that moves horizontally is used for transmitting the brown coal particle; Said hot blast chamber is arranged in the said below that moves horizontally travelling belt, and waste heat is passed in the hot blast chamber.
For waste heat is the situation of steam, in above-mentioned steps three, steam is passed in the horizontal moving bed hot blast chamber, so that coal particle is carried out dry pre-treatment.
For waste heat is the situation of the flue gas more than 100 ℃, in above-mentioned steps three, said flue gas heating to 1.5 more than the normal atmosphere, is carried out steam and is separated, and the flue gas after separating is fed in the horizontal moving bed hot blast chamber, so that coal particle is carried out dry pre-treatment.
For waste heat is the situation of no steam and no flue gas; In step 3; The burning brown coal produce flue gas; And bubbling air is adjusted into the air-flue gas gas mixture more than 120 ℃ with flue gas, then said air-flue gas gas mixture is passed in the horizontal moving bed hot blast chamber, so that coal particle is carried out dry pre-treatment.
Preferably, in step 1, coal particle is broken into size in some directions between 10～25mm.
After the above-mentioned brown coal drying pre-treatment, its moisture content is below 20%.The present invention utilizes waste heats such as the steam of power plant, hot blast, cold dry-air blast again, and brown coal are carried out dry pre-treatment, removes portion of water, has reduced follow-up brown coal drying dehydration energy needed eventually.Therefore, the brown coal drying pretreatment process has energy-conserving and environment-protective, improves advantages such as brown coal drying efficient.
Description of drawings
Fig. 1 carries out brown coal drying pretreatment process synoptic diagram for utilizing steam;
Fig. 2 carries out brown coal drying pretreatment process synoptic diagram for utilizing flue gas;
Fig. 3 is the brown coal drying pretreatment process synoptic diagram of no steam and flue gas occasion.
Embodiment
Be described in detail below in conjunction with the accompanying drawing specific embodiments of the invention.
Embodiment one
After steam occasion brown coal drying pretreatment process synoptic diagram as shown in Figure 1, raw coal are selected ferromagnetic material through preliminary broken back coal particle through the low intensity magnetic separation machine, send into horizontal moving bedly, feed steam in horizontal moving bed brown coal are carried out pre-treatment.
Embodiment two
Flue gas occasion brown coal drying pretreatment process synoptic diagram as shown in Figure 2, raw coal are sent into horizontal moving bed after selecting ferromagnetic material through preliminary broken back coal particle through the low intensity magnetic separation machine.Flue gas is forced into 1.5 carries out steam more than the normal atmosphere and separate, the flue gas after separating is fed horizontal moving bed brown coal are carried out pre-treatment.
Embodiment three
No steam as shown in Figure 3 and flue gas occasion brown coal drying pretreatment process synoptic diagram, raw coal are sent into horizontal moving bed after selecting ferromagnetic material through preliminary broken back coal particle through the low intensity magnetic separation machine.The burning brown coal produce flue gas, flue gas are adjusted into the air-flue gas gas mixture more than 120 ℃ at bubbling air in the smoke chamber, gas mixture is passed into horizontal moving bed brown coal is carried out pre-treatment.
Move horizontally travelling belt and hot blast chamber said horizontal moving bed comprising, the hot blast chamber is arranged in and moves horizontally the travelling belt below, and waste heat enters into the hot blast chamber brown coal particle is carried out drying, moves horizontally travelling belt and is used for transmitting the brown coal particle.
Claims (6)
1. one kind is used for brown coal are carried out dry pretreated method, comprising:
Step 1: raw coal is carried out fragmentation and screening;
Step 2: the coal particle to after the screening carries out magnetic separation, so that get rid of the ferromagnetic material in the coal particle;
Step 3: in the process of the coal particle after carrying magnetic separation,, adopt different modes that coal particle is carried out dry pre-treatment according to dissimilar waste heats; And preferably tail gas is handled.
2. according to the described method of claim 1; It is characterized in that in step 3, said coal particle is through horizontal moving bed conveying; Move horizontally travelling belt and hot blast chamber said horizontal moving bed comprising; The wherein said travelling belt that moves horizontally is used for transmitting the brown coal particle, and said hot blast chamber is arranged in the said below that moves horizontally travelling belt, and waste heat is passed in the hot blast chamber.
3. according to the described method of claim 2, it is characterized in that in step 3, said waste heat is a steam, steam is passed in the horizontal moving bed hot blast chamber, so that coal particle is carried out dry pre-treatment.
4. according to the described method of claim 2; It is characterized in that in step 3, said waste heat is the flue gas more than 100 ℃; With said flue gas heating to 1.5 more than the normal atmosphere; Carry out steam and separate, the flue gas after separating is fed in the horizontal moving bed hot blast chamber, so that coal particle is carried out dry pre-treatment.
5. according to the described method of claim 2; It is characterized in that, in step 3, for the waste heat of no steam and no flue gas; The burning brown coal produce flue gas; And bubbling air is adjusted into the air-flue gas gas mixture more than 120 ℃ with flue gas, then said air-flue gas gas mixture is passed in the horizontal moving bed hot blast chamber, so that coal particle is carried out dry pre-treatment.
6. according to the described method of claim 1, it is characterized in that, in step 1, coal particle is broken into size in some directions between 10～25mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110137456.9A CN102796581B (en) | 2011-05-26 | 2011-05-26 | Drying pretreatment method for lignite |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110137456.9A CN102796581B (en) | 2011-05-26 | 2011-05-26 | Drying pretreatment method for lignite |
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| Publication Number | Publication Date |
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| CN102796581A true CN102796581A (en) | 2012-11-28 |
| CN102796581B CN102796581B (en) | 2014-07-23 |
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| CN201110137456.9A Expired - Fee Related CN102796581B (en) | 2011-05-26 | 2011-05-26 | Drying pretreatment method for lignite |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105605600A (en) * | 2015-12-21 | 2016-05-25 | 中国矿业大学 | Method for using high-water-content low-ash-content lignite |
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| CN101476814A (en) * | 2008-12-24 | 2009-07-08 | 大唐国际化工技术研究院有限公司 | Low-rank coal drying method and system |
| CN101738077A (en) * | 2009-05-11 | 2010-06-16 | 中信国安盟固利新能源科技有限公司 | Brown coal drying and dehydrating device |
| WO2011002187A2 (en) * | 2009-06-29 | 2011-01-06 | 한국전력공사 | Method and apparatus for upgrading low-rank coal |
| CN102072631A (en) * | 2010-12-29 | 2011-05-25 | 北京航天万源煤化工工程技术有限公司 | Lignite drying equipment and method |
| CN201844667U (en) * | 2010-08-10 | 2011-05-25 | 浙江大学 | Belt type conveying and drying system and device using solar energy to dehydrate and improve quality of brown coal |
-
2011
- 2011-05-26 CN CN201110137456.9A patent/CN102796581B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101476814A (en) * | 2008-12-24 | 2009-07-08 | 大唐国际化工技术研究院有限公司 | Low-rank coal drying method and system |
| CN101738077A (en) * | 2009-05-11 | 2010-06-16 | 中信国安盟固利新能源科技有限公司 | Brown coal drying and dehydrating device |
| WO2011002187A2 (en) * | 2009-06-29 | 2011-01-06 | 한국전력공사 | Method and apparatus for upgrading low-rank coal |
| CN201844667U (en) * | 2010-08-10 | 2011-05-25 | 浙江大学 | Belt type conveying and drying system and device using solar energy to dehydrate and improve quality of brown coal |
| CN102072631A (en) * | 2010-12-29 | 2011-05-25 | 北京航天万源煤化工工程技术有限公司 | Lignite drying equipment and method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105605600A (en) * | 2015-12-21 | 2016-05-25 | 中国矿业大学 | Method for using high-water-content low-ash-content lignite |
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| CN102796581B (en) | 2014-07-23 |
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