CN103627467A - Drying, upgrading and forming process of lignite rich in water - Google Patents
Drying, upgrading and forming process of lignite rich in water Download PDFInfo
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- CN103627467A CN103627467A CN201310492254.5A CN201310492254A CN103627467A CN 103627467 A CN103627467 A CN 103627467A CN 201310492254 A CN201310492254 A CN 201310492254A CN 103627467 A CN103627467 A CN 103627467A
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Abstract
The invention discloses a drying, upgrading and forming process of lignite rich in water in the technical field of upgrading and efficient utilization of lignite rich in water. According to the process, waste hot gas containing steam after drying is used for the processes of dumping of raw coal on a yard, conveying and storage by virtue of a conveying and preheating system and equipment such as a preheating material bin, thereby achieving the aims of preheating, warming and dehydrating the raw coal. Not only is the process safe and reliable in running and high in operability, but also the system energy consumption is low, the upgrading efficiency is high, and the upgrading quality is good.
Description
[technical field]
The present invention relates to be rich in water brown coal upgrading efficient technique of rainwater utilization field, especially relate to a kind of technique that can carry out used heat recycling and reduce system energy consumption in being rich in the drying and upgrading moulding process of water brown coal.
[background technology]
Known, brown coal are that a kind of degree of coalification is minimum, between peat and pitch coal Zong ?look, lacklustre grizzle, because it is containing full moisture content 20-50%, as analysed basis moisture content 10-30%, fugitive constituent 15-30%, calorific value 11.71-16.73mj/kg, therefore, brown coal belong to that high-volatile, high moisture content, ash-rich, low heat value, low ash smelting point, easy-weathering are cracked, the inferior fuel of oxidizable spontaneous combustion; Yet because the lignite resource of China is relatively abundant, its premeasuring accounts for the more than 40% of national coal resources, therefore, brown coal are also used as fuel and widely apply; But, because brown coal contain high moisture, if participated in directly burning or coal gasification, can in ignition process, consume a large amount of energy on the one hand, be that the moisture being rich in brown coal can be taken away a large amount of heat energy in the process of evaporation, thereby make combustion exhaust gas thermosteresis large, generating thermo-efficiency is low, a large amount of discharges of greenhouse gases and harsh to the gasifying process requirement of brown coal; On the other hand, the high-volatile of brown coal very easily causes dieseling, when serious, also can blast, and therefore, the water brown coal that are rich in of exploiting out is in a large number directly used in to burning, not only can make boiler combustion unstable, and efficiency is lower;
At present, for of a great variety to the technology of brown coal upgrading, HPU flue gas drying moulding process as used in Shenhua Group, Huo Lin river roller flue gas drying process and German ZEMAG cylinder steam contact drying moulding process, these techniques are to utilize stack gas or steam directly to contact and make it to be heated with brown coal with air associating heating agent, by moisture evaporation, not only efficiency is lower for this, and dryly improperly also can make local superheating, ature of coal variation, controls and badly also easily sets off an explosion; Simultaneously, because existing technique is to dewater to being rich in water brown coal by consuming superheated vapour, dewatering, link superheated vapour consumption is large, system energy consumption is higher, its upgrading running cost is also relatively high, therefore, the water brown coal process for upgrading that is rich in that exploitation is advanced is to improve the brown coal market competitiveness, reduces the important subject of running cost.
[summary of the invention]
In order to overcome the deficiency in background technology, the invention discloses a kind of water brown coal drying and upgrading moulding process that is rich in, described technique is not only safe and reliable to operation, workable, and system energy consumption is low, upgrading efficiency is high, upgrading quality is good.
For achieving the above object, the present invention adopts following technical scheme:
A kind of water brown coal drying and upgrading moulding process that is rich in, first described technique be that the water brown coal that are rich in after fragmentation are sent into pre-hot aggregate bin by corresponding pre-heat transport apparatus and carried out preheating, make it slough a part of moisture content, and then the indirect cylinder of superheated vapour that the brown coal after preheating are sent in dehumidification system is dried, finally dried brown coal are at high temperature sent in high pressure hot-pressing forming system and carried out high-pressure molding by corresponding handling equipment, the product after moulding is admitted to moulded coal stockyard; Described technique will be rich in dust and the air mixed generating in the formed high heating value steam of water that water brown coal deviate from when dry and technique, make it form high heating value mixed gas, and by corresponding dust-removal system, this high heating value mixed gas is carried out to dedusting, and then the high heating value mixed gas after dedusting is delivered to respectively to the preliminary heating device in each stage in technique brown coal are carried out to preheating and second stage employ, meanwhile, a part of high heating value mixed gas is sent in high pressure hot-pressing forming system to the insulation thermal source as handling equipment and cleaning shaft.
Further, the steam using in described technique is produced into by steam boiler system; Described process using becomes high-temperature water by the vapor condensation of processing by dehumidification system, then by corresponding delivery system, sends the high-temperature water of generation back to steam boiler again to utilize.
Further, the steam using in described technique is exhaust steam of electric power plant.
Further, described high heating value mixed gas carries out heat again by reheater, and after reaching superheat state, sends into dust-removal system and carry out dedusting.
Further, described high heating value mixed gas is after dedusting, and a part is admitted to the former Coal Stack Yard of brown coal and crushing system, and the form of passing through pipeline radiation and directly contacting, and makes brown coal in former Coal Stack Yard and disintegrating apparatus, carry out preliminary temperature and improves; The water of condensation forming after devaporation in this part high heating value mixed gas is sent into water treatment system by waste water pump and is processed, and the steam not condensing is sent into Waste Water Treatment after condensing by condenser again.
Further, described high heating value mixed gas is after dedusting, and a part is admitted to the preheating pipe in pre-heat transport apparatus, for the brown coal on handling equipment, heats up and dewaters; The water of condensation forming after devaporation in this part high heating value mixed gas is sent into water treatment system by waste water pump and is processed, and the steam not condensing is sent into Waste Water Treatment after condensing by condenser again.
Further, described high heating value mixed gas is after dedusting, and a part is admitted to the preheating pipe in pre-hot aggregate bin, for the brown coal in pre-hot aggregate bin, further dewaters; The water of condensation forming after devaporation in this part high heating value mixed gas is sent into water treatment system by waste water pump and is processed, and the steam not condensing is sent into Waste Water Treatment after condensing by condenser again.
Further, described high heating value mixed gas is after dedusting, and the cleaning shaft that a part is admitted in high pressure hot-pressing forming system is warm to accompany, and the temperature of this part high heating value mixed gas is higher than steam close dew temperature.
Further, the high pressure hot-pressing forming system in described technique adopts high pressure, hot pressing, binder free roller press briquetting technology to carry out moulding to brown coal; Described high pressure hot-pressing forming system is first sent brown coal into surge bunker by corresponding handling equipment, until the brown coal in surge bunker, reach after a certain amount of and send into again forming machine pre-pressure feeding spiral, finally will send into high-pressure forming machine moulding by the material after pre-pressure feeding spiral precompressed.
Owing to adopting technical scheme as above, the present invention has following beneficial effect:
Of the present invention be rich in water brown coal drying and upgrading moulding process not only safe and reliable to operation, running cost is low, workable, and system energy consumption is low, upgrading efficiency is high, upgrading quality is good; Due to described process using the equipment such as conveying pre-heating system and pre-hot aggregate bin, thereby reached the waste hot gas of moisture vapor after dry for former Coal Stack Yard, conveying and storage process, utilize it raw coal to be carried out to the object of preheating, intensification and dehydration, therefore, compare with existing Technology, described technique has following beneficial effect:
1, described technique is carried out heat again to the drying machine waste gas that goes out of moisture vapor, dust, and make it after reaching superheat state, enter dust-removal system, then make it after dedusting, reach emission standard, this has not only effectively solved the problem of gas dewfall, knot wall in dust-removal system of moisture vapor, dust, but also makes the dust concentration after dedusting can reach discharging standards;
2, described technique can be carried out second stage employ to the vapoury hot gas after dedusting, makes that raw coal temperature before dry is improved, moisture is reduced, thereby makes the system energy consumption reduction by 15%～50% of dehumidification system; Meanwhile, described technique also by small portion containing the waste hot gas of dewatered steam for the material of formation system, the insulation of pipeline and companion's heat, thereby effectively reduce insulation, accompany hot energy consumption;
The workshop sections such as 3, the conveying of the material in described technique before entering dehumidification system, storage just carry out preheating, intensification and dehydration operation, this has greatly shortened the time of drying of dehumidification system to material, correspondingly shorten the upgrading time of whole system to material, improved drying efficiency and the dry production capacity of system;
4, after material dewatering in described technique, its moisture becomes steam, by reheater, become superheated vapour again, this part steam is at pre-heating system, in tracing system, raw coal is carried out to preheating dehydration, to dried material companion heat, then by by its condensation and send into water treatment system and process, water after processing like this can meet industrial requirement, the experiment proved that, in the upgrading line of 1,000,000 tons/year, apply described technique, can obtain every year 20～300,000 tons of service waters, the place that this lacks water resources, it not only can meet the demand of self process water, can also provide him to use simultaneously,
5, described process using steam contact drying, this has greatly reduced the Probability of explosion phenomenon in drying process again, thereby has effectively increased the safe reliability of production application.
[embodiment]
By the following examples, can explain in more detail the present invention, disclose object of the present invention and be intended to protect all changes and improvements in the scope of the invention, the present invention is not limited to the following examples:
The described water brown coal drying and upgrading moulding process that is rich in, first described technique be that the water brown coal that are rich in after fragmentation are sent into pre-hot aggregate bin by corresponding pre-heat transport apparatus and carried out preheating, make it slough a part of moisture content, and then the indirect cylinder of superheated vapour that the brown coal after preheating are sent in dehumidification system is dried, described dehumidification system adopts superheated vapour contact drying method, this has greatly reduced the explosion phenomenon in drying process, effectively raises the safe reliability of operation; Finally, dried brown coal are at high temperature sent in high pressure hot-pressing forming system and carried out high-pressure molding by corresponding handling equipment, the product after moulding is admitted to moulded coal stockyard; The steam adopting in described technique is generated by steam boiler system, or directly adopts existing exhaust steam of electric power plant; When adopting the steam of steam boiler generation, can will by dehumidification system, discharge vapor condensation after a part of heat enthalpy value and become to have the high-temperature water of certain heat enthalpy value, and then send the condensed water in high temperature of these generations back to steam boiler again to utilize by corresponding delivery system, by these condensed water in high temperature, improved the calorific value of water in steam boiler, thus the hear rate while having reduced steam boiler generating steam;
Described process using will be rich in dust and the air mixed generating in the formed high heating value steam of water that water brown coal deviate from when dry and technique, make it form high heating value mixed gas, and by corresponding dust-removal system, this high heating value mixed gas is carried out to dedusting, and then the high heating value mixed gas after dedusting is sent into the preliminary heating device in each stage in technique brown coal are carried out to preheating and second stage employ, thereby can make the heat energy Energy Intensity Reduction 20%～50% of whole dehumidification system; Specifically be implemented as follows: 1, a part is sent into the former Coal Stack Yard of brown coal and crushing system through the high heating value mixed gas of dedusting, this part gas by pipeline radiation and directly the form of contact make brown coal in former Coal Stack Yard and disintegrating apparatus, carry out preliminary temperature to improve; 2, a part is sent into the preheating pipe in pre-heat transport apparatus through the high heating value mixed gas of dedusting, utilize this part gas that the brown coal on handling equipment are heated up and dewatered, make further to improve through the brown coal temperature of pre-heat transport apparatus, and reduce a certain amount of moisture; 3, a part is sent into the preheating pipe in pre-hot aggregate bin through the high heating value mixed gas of dedusting, utilize this part gas further to dewater to the brown coal in pre-hot aggregate bin, make further to improve through the brown coal temperature of pre-hot aggregate bin, moisture is further reduced; As required, can the water of condensation forming after the devaporation in the arbitrary road high heating value mixed gas in above-mentioned three tunnels be sent into water treatment system by waste water pump processes, meanwhile, by condenser, Waste Water Treatment will be sent into after the devaporation of not condensing again;
As required, described high heating value mixed gas can be carried out to heat again by reheater, and after reaching superheat state, send into again dust-removal system and carry out dedusting, thereby effectively solved the problem of high heating value mixed gas dewfall, knot wall and difficult dedusting in dust-removal system; Simultaneously, a part of high heating value mixed gas is sent in high pressure hot-pressing forming system to the insulation thermal source as handling equipment and cleaning shaft, the cleaning shaft being admitted in high pressure hot-pressing forming system through the sub-fraction in the high heating value mixed gas of dedusting is warm to accompany, require the temperature of this part high heating value mixed gas higher than steam close dew temperature, this effectively solved dust in dedusting gas in pipeline along with the dewfall of steam wall built-up, cause the phenomenon of line clogging; High pressure hot-pressing forming system in described technique adopts high pressure, hot pressing, binder free roller press briquetting technology to carry out moulding to brown coal, described high pressure hot-pressing forming system is first sent brown coal into surge bunker by corresponding handling equipment, until the brown coal in surge bunker, reach after a certain amount of and send into again forming machine pre-pressure feeding spiral, finally will send into high-pressure forming machine moulding by the material after pre-pressure feeding spiral precompressed.
Part not in the detailed description of the invention is prior art, therefore the present invention is not described in detail.
Claims (9)
1. one kind is rich in water brown coal drying and upgrading moulding process, it is characterized in that: first described technique be that the water brown coal that are rich in after fragmentation are sent into pre-hot aggregate bin by corresponding pre-heat transport apparatus and carried out preheating, make it slough a part of moisture content, and then the indirect cylinder of superheated vapour that the brown coal after preheating are sent in dehumidification system is dried, finally dried brown coal are at high temperature sent in high pressure hot-pressing forming system and carried out high-pressure molding by corresponding handling equipment, the product after moulding is admitted to moulded coal stockyard; Described technique will be rich in dust and the air mixed generating in the formed high heating value steam of water that water brown coal deviate from when dry and technique, make it form high heating value mixed gas, and by corresponding dust-removal system, this high heating value mixed gas is carried out to dedusting, and then the high heating value mixed gas after dedusting is delivered to respectively to the preliminary heating device in each stage in technique brown coal are carried out to preheating and second stage employ, meanwhile, a part of high heating value mixed gas is sent in high pressure hot-pressing forming system to the insulation thermal source as handling equipment and cleaning shaft.
2. the water brown coal drying and upgrading moulding process that is rich according to claim 1, is characterized in that: the steam using in described technique is produced into by steam boiler system; Described process using becomes high-temperature water by the vapor condensation of processing by dehumidification system, then by corresponding delivery system, sends the high-temperature water of generation back to steam boiler again to utilize.
3. the water brown coal drying and upgrading moulding process that is rich according to claim 1, is characterized in that: the steam using in described technique is exhaust steam of electric power plant.
4. the water brown coal drying and upgrading moulding process that is rich according to claim 1, is characterized in that: described high heating value mixed gas carries out heat again by reheater, and after reaching superheat state, sends into dust-removal system and carry out dedusting.
5. according to being rich in water brown coal drying and upgrading moulding process described in claim 1 or 4, it is characterized in that: described high heating value mixed gas is after dedusting, a part is admitted to the former Coal Stack Yard of brown coal and crushing system, and the form of passing through pipeline radiation and directly contacting, make brown coal in former Coal Stack Yard and disintegrating apparatus, carry out preliminary temperature and improve; The water of condensation forming after devaporation in this part high heating value mixed gas is sent into water treatment system by waste water pump and is processed, and the steam not condensing is sent into Waste Water Treatment after condensing by condenser again.
6. according to being rich in water brown coal drying and upgrading moulding process described in claim 1 or 4, it is characterized in that: described high heating value mixed gas is after dedusting, a part is admitted to the preheating pipe in pre-heat transport apparatus, for the brown coal on handling equipment, heats up and dewaters; The water of condensation forming after devaporation in this part high heating value mixed gas is sent into water treatment system by waste water pump and is processed, and the steam not condensing is sent into Waste Water Treatment after condensing by condenser again.
7. according to being rich in water brown coal drying and upgrading moulding process described in claim 1 or 4, it is characterized in that: described high heating value mixed gas is after dedusting, a part is admitted to the preheating pipe in pre-hot aggregate bin, for the brown coal in pre-hot aggregate bin, further dewaters; The water of condensation forming after devaporation in this part high heating value mixed gas is sent into water treatment system by waste water pump and is processed, and the steam not condensing is sent into Waste Water Treatment after condensing by condenser again.
8. according to being rich in water brown coal drying and upgrading moulding process described in claim 1 or 4, it is characterized in that: described high heating value mixed gas is after dedusting, the cleaning shaft that a part is admitted in high pressure hot-pressing forming system is warm to accompany, and the temperature of this part high heating value mixed gas is higher than steam close dew temperature.
9. the water brown coal drying and upgrading moulding process that is rich according to claim 1, is characterized in that: the high pressure hot-pressing forming system in described technique adopts high pressure, hot pressing, binder free roller press briquetting technology to carry out moulding to brown coal; Described high pressure hot-pressing forming system is first sent brown coal into surge bunker by corresponding handling equipment, until the brown coal in surge bunker, reach after a certain amount of and send into again forming machine pre-pressure feeding spiral, finally will send into high-pressure forming machine moulding by the material after pre-pressure feeding spiral precompressed.
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Cited By (2)
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| WO2016037379A1 (en) * | 2014-09-12 | 2016-03-17 | 呼伦贝尔弘毅煤炭科技发展有限公司 | Method and apparatus for drying lignite and improving quality of lignite |
| CN110455044A (en) * | 2019-07-31 | 2019-11-15 | 武汉钢铁有限公司 | A kind of wet coal predrying system and method based on surplus energy utility |
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| CN101831314A (en) * | 2009-03-12 | 2010-09-15 | 兰州瑞德干燥技术有限公司 | Method for humidifying and drying coking coal in coke oven and equipment therefor |
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Patent Citations (3)
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| CN101722669A (en) * | 2008-10-27 | 2010-06-09 | 神华集团有限责任公司 | Pulverized coal molding method without binding agent and double-roller molding machine suitable for method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016037379A1 (en) * | 2014-09-12 | 2016-03-17 | 呼伦贝尔弘毅煤炭科技发展有限公司 | Method and apparatus for drying lignite and improving quality of lignite |
| CN110455044A (en) * | 2019-07-31 | 2019-11-15 | 武汉钢铁有限公司 | A kind of wet coal predrying system and method based on surplus energy utility |
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