CN102816620B - Lignite drying method - Google Patents
Lignite drying method Download PDFInfo
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- CN102816620B CN102816620B CN201110154565.1A CN201110154565A CN102816620B CN 102816620 B CN102816620 B CN 102816620B CN 201110154565 A CN201110154565 A CN 201110154565A CN 102816620 B CN102816620 B CN 102816620B
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- Prior art keywords
- brown coal
- coal
- drying method
- chemical reagent
- brown
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- 239000003077 lignite Substances 0.000 title claims abstract description 66
- 238000001035 drying Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 230000018044 dehydration Effects 0.000 claims abstract description 19
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 19
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 claims description 19
- 239000002817 coal dust Substances 0.000 claims description 17
- 150000007522 mineralic acids Chemical class 0.000 claims description 12
- 239000003245 coal Substances 0.000 claims description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 125000001931 aliphatic group Chemical group 0.000 claims description 3
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 3
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 9
- 230000009102 absorption Effects 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 238000004134 energy conservation Methods 0.000 abstract 1
- 230000009103 reabsorption Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 3
- 239000002250 absorbent Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention relates to a lignite drying method. The lignite drying method includes the steps: grinding raw lignite into pulverized lignite; adding a chemical reagent which can break water absorption molecular structures in the lignite and break organic chain combination keys in water molecules and the lignite; and subjecting the pulverized lignite with the chemical reagent to mechanical extruding for dehydration. The lignite drying method has the advantages of simple process, energy conservation, environment protection, high dehydration rate and avoidance of reabsorption of water.
Description
Technical field
The present invention relates to a kind of brown coal drying method, especially for the drying means of the high brown coal of water content.It belongs to fast energy-saving, the deep dehydration field of drying and upgrading field, the especially brown coal of brown coal.
Background technology
Brown coal reserves account for 15% left and right of coal in China total reserves, are the main coal resources of one of China.At China's electric power and chemical industry with playing an important role in coal.Brown coal belong to the coal that a kind of degree of coalification is low.Its moisture content is mostly 20%～50%.Brown coal have flourishing hole and surface, therefore active high, water-absorbent is strong.Brown coal are directly used in power plant's generating because its calorific value is low and difficult.The high moisture content of brown coal also makes it be unsuitable for long distance transportation simultaneously, and this is also one of bottleneck restricting for a long time lignite resource utilization.And by drying treatment, reduce the moisture of coal, and can improve calorific value and energy density on the one hand, reduce transportation cost, can also improve on the other hand the utilising efficiency of downstream unit, reduce equipment scale.
Main brown coal dehydration technique has both at home and abroad: hot dry dehydration technique, High Temperature High Pressure dehydration technique, cold dry dehydration technique and vacuum expansion dehydration technique etc.These brown coal drying and dehydrating technology are because power consumption is larger, equipment complexity, and many places are in scale demonstration phase, and the complexity of operation and stable problem have hindered these Process Planning modellings application.And along with brown coal water content increases, adopt the also corresponding increase of the required energy consumption of conventional dry technology.
Therefore, processing method is simple, energy-conserving and environment-protective, the main direction that dehydration rate brown coal drying technology high and that do not relapse water is research and development always.
Summary of the invention
The object of the invention is the equipment complexity existing for existing brown coal drying technology, energy consumption is high, and brown coal dehydration is insufficient, easily reuptakes the deficiencies such as moisture after dehydration, and a kind of brown coal drying method is provided.
Foregoing invention object realizes by brown coal drying method provided by the invention.
According to brown coal drying method of the present invention, it comprises the following steps:
Step 1: brown coal raw coal is finely ground to brown coal coal dust;
Step 2: add the water suction molecular structure that can destroy in brown coal and the chemical reagent that can destroy organic chain associative key in water molecules and brown coal in the brown coal coal dust after levigate;
Step 3: the brown coal coal dust that adds chemical reagent is carried out to mechanical presses dehydration.
Compared with prior art,, energy-conserving and environment-protective simple by brown coal drying method technique of the present invention, dehydration rate is high and do not relapse water.This scheme is specially adapted to the brown coal that water content is high.Design of the present invention is: by adding the chemical reagent of the water suction molecular structure that can destroy in brown coal, make no longer to absorb moisture after the dehydration of brown coal coal dust.In addition, described chemical reagent can activate brown coal surface tissue, has destroyed the associative key between water molecules and brown coal organic chain, makes water molecules depart from the organic chain constraint of brown coal and escapes, for further mechanical presses creates conditions, reduced the required energy consumption of mechanical presses.
Preferably, before carrying out mechanical presses dehydration, the brown coal coal dust that adds chemical reagent is fully stirred, thereby make chemical reagent fully act on coal dust, be conducive to dehydration evenly, improve dewatering efficiency.
Preferably, the add-on of inorganic acid solution in the following manner determine, that is: with hold the brown coal that tightly add after inorganic acid solution can make its agglomerating and loose one's grip after not loose.
Preferably, before carrying out mechanical presses, with bag filter, encase the brown coal coal dust that adds chemical reagent, thereby be convenient to coal dust to carry out mechanical presses.
Preferably, described chemical reagent comprises inorganic acid solution and water reducer, wherein first adds inorganic acid solution, then adds water reducer.Particularly preferably be, described inorganic acid solution is the nitric acid of 10%-25% hydrochloric acid, 10%-65% sulfuric acid or 5%-20%, and described water reducer is poly carboxylic acid series water reducer, naphthalene water reducer or aliphatic water reducing agent.
Preferably, in step 1, brown coal raw coal is finely ground to fineness and reaches brown coal coal dust more than R90.
Preferably, described water reducer add-on is quality of pc 1%～3%.
Accompanying drawing explanation
By specific embodiment, elaborate the present invention below.Wherein
Fig. 1 illustrates according to the schematic flow sheet of brown coal drying method of the present invention.
Embodiment
Brown coal drying method flow schematic diagram as shown in Figure 1, by coal pulverizer, raw coal being worn into fineness is coal dust more than R90, then add inorganic acid solution (described inorganic acid solution is for example the nitric acid of the hydrochloric acid of 10%-25% or the sulfuric acid of 10%-65% or 5%-20%), and be incorporated as 1%～3% water reducer (described water reducer is for example poly carboxylic acid series water reducer, naphthalene water reducer or aliphatic water reducing agent) of quality of pc, after fully stirring, with bag filter, coal dust is wrapped, be put into and on extrusion machine, carry out mechanical presses dehydration.
Initial water content is that 30% brown coal adopt that by method of the present invention, to dehydrate rear final water content be 18%.
Claims (4)
1. a brown coal drying method, described brown coal drying method comprises the following steps:
Step 1: brown coal raw coal is finely ground to brown coal coal dust;
Step 2: add the water suction molecular structure that can destroy in brown coal and the chemical reagent that can destroy organic chain associative key in water molecules and brown coal in the brown coal coal dust after levigate;
Step 3: the brown coal coal dust that adds chemical reagent is carried out to mechanical presses dehydration;
Described chemical reagent is comprised of inorganic acid solution and water reducer, wherein first adds inorganic acid solution, and then adds water reducer;
Described inorganic acid solution is the nitric acid of the hydrochloric acid of 10%-25% or the sulfuric acid of 10%-65% or 5%-20%;
The add-on of inorganic acid solution in the following manner determine, that is: with hold the brown coal that tightly add after inorganic acid solution can make its agglomerating and loose one's grip after not loose;
Described water reducer is poly carboxylic acid series water reducer, naphthalene water reducer or aliphatic water reducing agent;
Described water reducer add-on is quality of pc 1% to 3%.
2. by brown coal drying method claimed in claim 1, it is characterized in that, before carrying out mechanical presses dehydration, the brown coal coal dust that adds chemical reagent is fully stirred.
3. by brown coal drying method claimed in claim 1, it is characterized in that, before carrying out mechanical presses, with bag filter, encase the brown coal coal dust that adds chemical reagent.
4. by brown coal drying method claimed in claim 1, it is characterized in that, in step 1, brown coal raw coal is finely ground to fineness and reaches brown coal coal dust more than R90.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110154565.1A CN102816620B (en) | 2011-06-10 | 2011-06-10 | Lignite drying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110154565.1A CN102816620B (en) | 2011-06-10 | 2011-06-10 | Lignite drying method |
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| Publication Number | Publication Date |
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| CN102816620A CN102816620A (en) | 2012-12-12 |
| CN102816620B true CN102816620B (en) | 2014-05-07 |
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| CN201110154565.1A Expired - Fee Related CN102816620B (en) | 2011-06-10 | 2011-06-10 | Lignite drying method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104073319B (en) * | 2014-07-11 | 2016-09-07 | 郑翔书 | A kind of brown coal additive and brown coal dehydration treatment method |
| US10526556B2 (en) * | 2017-05-16 | 2020-01-07 | Omnis Mineral Technologies, Llc | Agglomeration of ultra-fine coal particles |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101735842A (en) * | 2008-11-14 | 2010-06-16 | 李柏荣 | Device for improving thermal efficiency of fire coal by low-cost drying and waterproofing of brown coal |
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| CN1594338B (en) * | 2004-07-08 | 2010-08-04 | 哈尔滨工程大学 | Process for preparing super-strong anti-hard-water sodium (potassium) humate |
| US20100264720A1 (en) * | 2007-12-21 | 2010-10-21 | National Power Australia Investments Limited | Method for producing a lignite product |
| WO2009147360A1 (en) * | 2008-06-04 | 2009-12-10 | Solsys Limited | Fuel product and process |
| CN101780390B (en) * | 2009-01-16 | 2012-11-21 | 中国科学院过程工程研究所 | Substitution and dehydration method for water contained solid materials and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101735842A (en) * | 2008-11-14 | 2010-06-16 | 李柏荣 | Device for improving thermal efficiency of fire coal by low-cost drying and waterproofing of brown coal |
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| CN102816620A (en) | 2012-12-12 |
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