CN103436322B - A kind of method and apparatus of brown coal upgrading drying and moulding - Google Patents
A kind of method and apparatus of brown coal upgrading drying and moulding Download PDFInfo
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- CN103436322B CN103436322B CN201310330787.3A CN201310330787A CN103436322B CN 103436322 B CN103436322 B CN 103436322B CN 201310330787 A CN201310330787 A CN 201310330787A CN 103436322 B CN103436322 B CN 103436322B
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Abstract
The invention discloses a kind of method and apparatus of brown coal upgrading drying and moulding, the method comprises: 1) brown coal powder is broken into coal dust; 2) in coal dust, add sodium hydroxide, stir and pass into water vapor and make it fully react; 3) reacted brown coal are carried out drying, compression moulding, to obtain final product.The method of brown coal upgrading drying and moulding of the present invention, greatly reduces the airborne dust in drying process, decreases topsoil, improve Working environment; Decrease the coal ash content in drying machine volatilization moisture, be conducive to reclaiming a large amount of moisture; Adding density and the intensity of moulded coal, without the need to adding binding agent in moulding process, just can meet transport and need of production.The equipment of brown coal upgrading drying and moulding of the present invention, achieves the drying and moulding integrated continuous cleaner production of brown coal upgrading, is suitable for the large-scale industrial production of brown coal upgrading drying and moulding.
Description
Technical field
The invention belongs to brown coal upgrading technical field of drying, be specifically related to a kind of method and apparatus of brown coal upgrading drying and moulding.
Background technology
China is the country taking primary energy source resource with coal as the leading factor, and coal can provide the primary energy source of more than 65%, and coal production occupies first place in the world, and increases year by year.The coal resources workable reserve of China occupies third place in the world, accounts for 11.5% of world's total reserves.Wherein brown coal reserves account for 16% of world's brown coal total reserves, and major part concentrates on North China.Along with to the continuous increase of energy demand and the overexploitation to bituminous coal, anthracite resource, the development and utilization of China to brown coal will be more and more important.Compared with bituminous coal, hard coal, the advantage of brown coal is that price is lower, and reactive behavior is high, but its calorific value is relatively low, and water content is higher, is generally 25-60%.Moisture in brown coal increases transportation cost, affects boiler operatiopn, reduces power plant efficiency, and increase greenhouse gas emission, therefore the exploitation of brown coal drying and upgrading Technology and equipment is cleaner production and the key effectively utilizing brown coal.
The upgrading of brown coal refers to that brown coal change into the upgraded coal with bituminous coal character after at high temperature standing dehydration and thermolysis effect, outside brown coal dehydration dis portion of water, also along with the change of the Nomenclature Composition and Structure of Complexes of some coals, it is mainly caused by dehydration and process, so the dehydration of brown coal grading process mainly brown coal.The brown coal dehydration upgrading process aftershaping that moisture is high, calorific value is low, significantly can reduce Coal ' moisture, improve thermal value, increase product density, prevent spontaneous combustion of coal, after brown coal upgrading processing, its composition and character level off to bituminous coal, and shaping after be convenient to transport and storage, be beneficial to the multiple uses such as generating, gas making, chemical industry, become high value added product.
The significance of brown coal upgrading drying and moulding is: 1) for transport, the handling charges of coal also determines the price of coal, a large amount of moisture is carried out long distance delivery, virtually add the cost of coal, the high moisture content of brown coal limits the brown coal of this area to long distance transportation, in northern cold season, high water content brown coal is all very difficult in carrying and storage etc., and the brown coal after transformation dryness are more conducive to utilize, transport and storage; 2) for generating, the advantage of brown coal is with low cost, 1/3 ~ 1/4 of black coal generating, 1/6 ~ 1/7 of natural gas power, but its shortcoming is maximum discharge amount, low heat value and greenhouse gases (GHG) emission problem, and its moisture of brown coal after transformation dryness reduces, after thermal value increase, oxidation rate step-down, combustion, the quantity discharged of greenhouse gases is little, is more conducive to power plants generating electricity; 3) brown coal after transformation dryness are hot-forming through high-voltage double-roller forming machine, obtain upgrading moulded coal, shapingly increase brown coal density, and can reduce moisture resorption, make it be more conducive to transport, store and reduce environmental pollution; 4) the hot-forming range of application expanding brown coal of brown coal upgrading, such as can be directly used in coking, produce coke and coal tar wet goods byproduct, and for BGL and Lurgi gasifier, production combustion gas and synthetic gas etc.
At present, brown coal drying and upgrading mainly adopt the drying of roller drying, tubulose, air stream drying, fluidised bed drying, hotblast stove drying etc., conventional transformation dryness equipment comprises crusher, drying machine, forming machine, this equipment in process of production coal ash is full of whole workshop, not only polluted air, there is inflammable and explosive danger, and the health of serious threat operator; Meanwhile, containing a large amount of coal ash in the moisture of volatilization, the recovery of moisture is unfavorable for; The intensity of the moulded coal produced is also not ideal, can not meet conveyor need of production, therefore realizes large-scale industrial production more difficult.
Summary of the invention
The object of this invention is to provide a kind of method of brown coal upgrading drying and moulding, solve the coal ash pollution problem in brown coal upgrading drying and moulding process, improve the intensity of moulded coal.
Second object of the present invention is to provide a kind of equipment realizing the brown coal upgrading drying and moulding of aforesaid method.
In order to realize above object, the technical solution adopted in the present invention is: a kind of method of brown coal upgrading drying and moulding, comprises the following steps:
1) brown coal powder is broken into the coal dust of below 3mm;
2) in step 1) gained coal dust, add sodium hydroxide, stir and pass into water vapor and make it fully react;
3) reacted brown coal are carried out drying, compression moulding, to obtain final product.
Step 2) in the add-on of sodium hydroxide be 0.5% ~ 3% of quality of pc.
Step 2) in the intake of water vapor be 3% ~ 5% of coal dust volume; The temperature of described water vapor is 95 ~ 100 DEG C, and pressure is 0.6MPa.The effect passing into water vapor promotes that the humic acids in sodium hydroxide and brown coal fully reacts, and generates Sodium salts humic acids.
Step 2) described in reaction time be 20 ~ 60min.This reaction condenses into globular coal dust group for good with coal dust.
Described in step 3), drying is warm air drying.
The hot blast temperature of described warm air drying is 115 ~ 125 DEG C, and time of drying is 25 ~ 30min.
The linear pressure of compression moulding described in step 3) is 10 ~ 12T, and shaping humidity is 10 ~ 30%, and mold temperature is 35 ~ 90 DEG C.
A kind of equipment of brown coal upgrading drying and moulding, comprise crusher, drying machine and forming machine, described forming machine is provided with the import entered for the siccative from the drier outlet of drying machine, also comprise stirrer, described stirrer is provided with the material inlet entered for the coal dust from the discharge of crusher, and described drying machine is provided with the wet feed import entered for the material from the material outlet of stirrer; Described stirrer is also provided with sodium hydroxide addition port, water vapor import and steam outlet.
Described drying machine is provided with hot wind inlet, hot-blast outlet and fly-ash separator interface.
The products export of described forming machine is provided with test sieve; The anti-material outlet of described test sieve is connected with the import of forming machine.
The method of brown coal upgrading drying and moulding of the present invention, a certain amount of sodium hydroxide is added in coal dust, passing into water vapor makes it fully react, globular coal dust group is condensed into for good with coal dust, then drying, shaping is carried out, the method utilizes the characteristic containing humic acids in brown coal, the humic acids added in sodium hydroxide and brown coal reacts and generates Sodium salts humic acids, coal dust condenses agglomerating in chemical reaction process, greatly reduce its airborne dust in drying process, not only reduce topsoil, and improve Working environment, decrease the actual bodily harm to workman; Decrease the coal ash content in volatilization moisture, be conducive to reclaiming a large amount of moisture; The Sodium salts humic acids generated, as later stage shaping binding agent, adds density and the intensity of moulded coal, without the need to adding binding agent again in moulding process, just can meet transport and need of production; Be applicable to large-scale industrial production.
The equipment of brown coal upgrading drying and moulding of the present invention, stirrer is provided with between crusher and drying machine, this stirrer is also provided with sodium hydroxide addition port, water vapor import and steam outlet, this equipment can realize in the drying and moulding integrated quantity-produced process of brown coal upgrading, add sodium hydroxide, humic acids in itself and brown coal is reacted and generates Sodium salts humic acids, coal dust in stirrer condenses agglomerating in chemical reaction process, greatly reduce the follow-up airborne dust produced when drying machine is dry, not only reduce topsoil, and improve Working environment, decrease the actual bodily harm to workman, decrease the coal ash content in drying machine volatilization moisture, be conducive to reclaiming a large amount of moisture, the Sodium salts humic acids generated, as later stage shaping binding agent, adds density and the intensity of the moulded coal produced in follow-up roller pressing forming machine, without the need to adding binding agent again in moulding process, just can meet transport and need of production, this equipment is suitable for the large-scale industrial production of brown coal upgrading drying and moulding.
Accompanying drawing explanation
Fig. 1 is the structural representation of the equipment of the brown coal upgrading drying and moulding of embodiment 1;
Fig. 2 is the structural representation of the equipment of the brown coal upgrading drying and moulding of embodiment 2.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated.
Embodiment 1
The method of the brown coal upgrading drying and moulding of the present embodiment, comprises the following steps:
1) brown coal powder is broken into the coal dust of below 3mm;
2) in step 1) gained coal dust, the sodium hydroxide that quality is quality of pc 0.5% is added, stirring and passing into volume is that the water vapor of 3% of coal dust volume makes it fully react, the temperature of this water vapor is 100 DEG C, pressure is 0.6MPa, and the time of reaction is 40min;
3) reacted brown coal are carried out 120 DEG C of warm air dryings, time of drying is 30min; The compression moulding that laggard line pressure is 10T, shaping humidity is 20%, mold temperature is 90 DEG C, to obtain final product.
The equipment realizing the brown coal upgrading drying and moulding of aforesaid method of the present embodiment, as shown in Figure 1, comprise crusher 2, drying machine 3 and forming machine 4, described forming machine 4 is provided with the import entered for the siccative from the drier outlet 14 of drying machine 3, also comprise stirrer 5, described stirrer 5 is provided with the material inlet entered for the coal dust from the discharge of crusher 2, and described drying machine 3 is provided with the wet feed import 13 entered for the material from the material outlet of stirrer 5; Described stirrer 5 is also provided with sodium hydroxide addition port 6, water vapor import 7 and steam outlet 8.Described drying machine 3 is provided with hot wind inlet 9, hot-blast outlet 10 and fly-ash separator interface 12.Described hot wind inlet 9 is connected with the outlet of hotblast stove, and described fly-ash separator interface 12 is connected with the import of fly-ash separator.Described forming machine 4 is roller pressing forming machine.
During work, enter crusher 2 from the brown coal of brown coal run coal bin 1 and pulverize, after enter stirrer 5, mix with the sodium hydroxide added from sodium hydroxide addition port 6, the water vapor entered from water vapor import 7 makes it fully react; Reacted brown coal enter after drying machine 3 carries out drying, and enter forming machine 4 shaping, the moulded coal after shaping directly enters moulded coal storehouse 5.
Embodiment 2
The method of the brown coal upgrading drying and moulding of the present embodiment, comprises the following steps:
1) brown coal powder is broken into the coal dust of below 3mm;
2) in step 1) gained coal dust, the sodium hydroxide that quality is quality of pc 3% is added, stirring and passing into volume is that the water vapor of 4% of coal dust volume makes it fully react, the temperature of this water vapor is 95 DEG C, pressure is 0.6MPa, the time of reaction is 60min, condenses into globular coal dust group for good with coal dust;
3) reacted brown coal are carried out 120 DEG C of warm air dryings, time of drying is 30min; The compression moulding that laggard line pressure is 10T, shaping humidity is 20%, mold temperature is 90 DEG C, to obtain final product.
The equipment realizing the brown coal upgrading drying and moulding of aforesaid method of the present embodiment, be with the equipment difference of embodiment 1: as shown in Figure 2, the products export of described forming machine 4 is provided with test sieve 11; The anti-material outlet of described test sieve 11 is connected with the import of forming machine 4.Moulded coal storehouse 5 is directly entered from test sieve 11 briquette prod out.
The effect of test sieve is sifted out by coal dust not shaping in shaping apparatus product, expects to export the import coal dust sifted out being returned forming machine, re-start shaping, improve the utilization ratio of resource, avoid the waste of resource by counter, cost-saving.
Embodiment 3
The method of the brown coal upgrading drying and moulding of the present embodiment, comprises the following steps:
1) brown coal powder is broken into the coal dust of below 3mm;
2) in step 1) gained coal dust, add the sodium hydroxide that quality is quality of pc 1.5%, stirring and passing into volume is that 5% water vapor of coal dust volume makes it fully react, and the temperature of this water vapor is 97 DEG C, pressure is 0.6MPa, and the time of reaction is 20min;
3) reacted brown coal are carried out 120 DEG C of warm air dryings, time of drying is 30min; The compression moulding that laggard line pressure is 10T, shaping humidity is 20%, mold temperature is 90 DEG C, to obtain final product.
The equipment realizing the brown coal upgrading drying and moulding of aforesaid method of the present embodiment, the equipment of the brown coal upgrading drying and moulding used with embodiment 2 is identical.
Claims (4)
1. a method for brown coal upgrading drying and moulding, is characterized in that: comprise the following steps:
1) brown coal powder is broken into the coal dust of below 3mm;
2) in step 1) gained coal dust, add sodium hydroxide, stir and pass into water vapor and make it fully react;
3) reacted brown coal are carried out drying, compression moulding, to obtain final product;
Wherein, step 2) in the add-on of sodium hydroxide be 0.5% ~ 3% of quality of pc;
Step 2) in the intake of water vapor be 3% ~ 5% of coal dust volume; The temperature of described water vapor is 95 ~ 100 DEG C, and pressure is 0.6MPa;
Step 2) described in reaction time be 20 ~ 60min;
Described in step 3), drying is warm air drying; The hot blast temperature of described warm air drying is 115 ~ 125 DEG C, and time of drying is 25 ~ 30min;
The linear pressure of compression moulding described in step 3) is 10 ~ 12T, and shaping humidity is 10 ~ 30%, and mold temperature is 35 ~ 90 DEG C.
2. the method for brown coal upgrading drying and moulding according to claim 1, the method equipment used comprises crusher, drying machine and forming machine, described forming machine is provided with the import entered for the siccative from the drier outlet of drying machine, it is characterized in that: also comprise stirrer, described stirrer is provided with the material inlet entered for the coal dust from the discharge of crusher, and described drying machine is provided with the wet feed import entered for the material from the material outlet of stirrer; Described stirrer is also provided with sodium hydroxide addition port, water vapor import and steam outlet.
3. the method for brown coal upgrading drying and moulding according to claim 2, is characterized in that: described drying machine is provided with hot wind inlet, hot-blast outlet and fly-ash separator interface.
4. the method for brown coal upgrading drying and moulding according to claim 2, is characterized in that: the products export of described forming machine is provided with test sieve; The anti-material outlet of described test sieve is connected with the import of forming machine.
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| CN201310330787.3A CN103436322B (en) | 2013-07-31 | 2013-07-31 | A kind of method and apparatus of brown coal upgrading drying and moulding |
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| CN201310330787.3A CN103436322B (en) | 2013-07-31 | 2013-07-31 | A kind of method and apparatus of brown coal upgrading drying and moulding |
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| CN103436322B true CN103436322B (en) | 2016-01-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105316066B (en) * | 2015-11-17 | 2018-10-19 | 中国科学院过程工程研究所 | A kind of method that the molding of lignite binder prepares pressurized gasification moulded coal |
| CN106047432A (en) * | 2016-05-31 | 2016-10-26 | 北京神雾环境能源科技集团股份有限公司 | Forming method of lignite pellets |
| CN114921272A (en) * | 2018-02-11 | 2022-08-19 | 内蒙古工业大学 | Sodium-based lignite and preparation method thereof |
| CN114813435A (en) * | 2022-03-23 | 2022-07-29 | 浙江工业大学 | Method for determining Hardgrove grindability index of lignite |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1371962A (en) * | 2002-01-25 | 2002-10-02 | 湖南省化学化工学会 | Coal powder formation producing gas method for nitrogen fertilizer production |
| CN1931973A (en) * | 2006-10-11 | 2007-03-21 | 葛苏 | Clean briquette for producing chemical fertilizer gas and its prepn process and application |
| CN203403073U (en) * | 2013-07-31 | 2014-01-22 | 郑州大城重工有限公司 | Upgrading, drying and forming equipment for lignite |
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| US6860911B2 (en) * | 2001-01-10 | 2005-03-01 | Joseph W. Hundley | Synfuel composition and method of using same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1371962A (en) * | 2002-01-25 | 2002-10-02 | 湖南省化学化工学会 | Coal powder formation producing gas method for nitrogen fertilizer production |
| CN1931973A (en) * | 2006-10-11 | 2007-03-21 | 葛苏 | Clean briquette for producing chemical fertilizer gas and its prepn process and application |
| CN203403073U (en) * | 2013-07-31 | 2014-01-22 | 郑州大城重工有限公司 | Upgrading, drying and forming equipment for lignite |
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