CN103421568A - High-water-content low-rank-coal pulverizing and drying process and system thereof - Google Patents
High-water-content low-rank-coal pulverizing and drying process and system thereof Download PDFInfo
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- CN103421568A CN103421568A CN2013103752918A CN201310375291A CN103421568A CN 103421568 A CN103421568 A CN 103421568A CN 2013103752918 A CN2013103752918 A CN 2013103752918A CN 201310375291 A CN201310375291 A CN 201310375291A CN 103421568 A CN103421568 A CN 103421568A
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Abstract
The invention relates to a high-water-content low-rank-coal pulverizing and drying process and a system thereof, so that the problems that predrying is required before coal is pulverized, operating cost and equipment investment are high, energy consumption is high in an existing pulverizing and drying process are solved. According to the technical scheme, the high-water-content low-rank-coal pulverizing and drying process comprises the steps that feed coal is sent into a coal pulverizer for coal pulverizing and meanwhile thoroughly dried by combusting smoke gas from a pulverized coal boiler, a pulverized coal and gas mixture is sent into a primary bag filter to be filtered and separated to form pulverized coal and gas, the filtered pulverized coal is sent into a fluidized bed or an entrained bed dryer to be sufficiently fluidified and dried by the combusting smoke gas from the pulverized coal boiler, the dried pulverized coal and gas mixture is sent into a secondary bag filter to be separated to form pulverized coal and gas, and the pulverized coal is sent to a pulverized coal bunker for storing. The high-water-content low-rank-coal pulverizing and drying process is simple, easy and convenient to control, good in drying effect and low in operating cost. The system of the high-water-content low-rank-coal pulverizing and drying process is low in equipment investment, small in occupied area, safe and reliable.
Description
Technical field
The present invention relates to a kind of powder process and drying process and system thereof of chemical industry, specifically a kind of powder process of high moisture low-rank coal and drying process and system thereof.
Background technology
Along with expanding economy, the clean utilization of coal will be the emphasis of China's energy utilization.At present develop goes out that all kinds of coal adaptabilities are wide, vapor pressure is high, throughput is large, gasification efficiency is high, pollute few coal gasifying process of new generation, and wherein more typical gasification technology has the strange pressurization static bed gasification technology in Shandong, KBR fluidized-bed or entrained flow bed gasification technology and SHELL entrained flow bed gasification technology.Although coal obtains clean fuel through advanced gasification technology or other elementary Chemicals have broad application prospects in China.But various gasification technologies all have self advantage, shortcoming and adaptability, as fixed bed gasification often adopts lump coal as raw material, higher to the lump coal proportion requirement in feed coal, the coal for gasification water content is generally more low better, and general requirement is no more than 8%; The fine coal of the particle diameter of fluidized-bed or entrained flow gasification general requirement raw coal is broken into<10mm and for example,<1mm particle diameter fine powder should be controlled at below 10%, advances the coal water content of vapourizing furnace<5% and is advisable.Given this, general feed coal required all to need to do coal-grinding and drying treatment according to its gasifying process before gasification.
Take the SHELL gasifying process as example, and traditional mill coal drying technique generally adopts medium-speed pulverizer abrasive dust, hotblast stove that the technical process of thermal cycling air dry coal dust is provided.When the water content of feed coal 25% when following, this kind of mill coal drying technique has its technology and economic advantages, but when in feed coal, water content surpasses 25%, the be heated restriction of the equipment tolerable temperatures such as circulation gas tolerance and coal pulverizer, for being dried to the qualified coal dust than low water content, need to configure pre-drying device before coal-grinding feed coal is carried out to pre-treatment, can greatly improve plant investment like this, affect the economy of gasification installation.
Summary of the invention
The present invention relates to a kind of technique is simple, control the moisture low-rank coal of height easy, that drying effect good, running cost is low powder process and drying process.
The present invention also provides a kind of system for above-mentioned technique, has advantages of that facility investment is low, floor space is little, security of system reliably reaches running cost low.
Powder process and the drying process of the high moisture low-rank coal of the present invention, comprise when feed coal is sent into to coal pulverizer and carried out coal-grinding fully dry by the combustion product gases from pulverized coal firing boiler, coal dust after coal-grinding and gaseous mixture are sent into the one-level deep bed filter and are filtered to isolate coal dust and gas, coal dust after filtration is sent into fluidized-bed or air flow bed moisture eliminator by the abundant fluidisation of the combustion product gases from pulverized coal firing boiler and drying, dried coal dust and gaseous mixture are sent into the secondary deep bed filter and are isolated coal dust and gas, and described coal dust is delivered to the coal dust bunker and stored.
Describedly through one-level deep bed filter and the isolated gas of secondary deep bed filter part, after the gas compressor compression with after the combustion product gases of pulverized coal firing boiler mixes, send into coal pulverizer and fluidized-bed or air flow bed moisture eliminator, rest part effluxes after treatment.
The volume ratio of mixing of the combustion product gases of described gas after gas compressor compression and pulverized coal firing boiler is 0.5:10～2:10.
Powder process and the dehumidification system of the high moisture low-rank coal of the present invention, comprise coal pulverizer, described coal pulverizer is connected successively with one-level deep bed filter, fluidized-bed or air flow bed moisture eliminator, secondary deep bed filter successively, and the hot gas approach of the gas approach of described coal pulverizer and fluidized-bed or air flow bed moisture eliminator is connected with the exhanst gas outlet of pulverized coal firing boiler.
The pneumatic outlet of described one-level deep bed filter and secondary deep bed filter is connected with the hot exhanst gas outlet of pulverized coal firing boiler through tail-gas compressor.
The contriver has changed the predrying mode in conjunction with mill coal drying technique of the dry employing usually of feed coal in the past, before coal-grinding, do not carry out predrying, but pass through to adopt fluidized-bed or the dry coal dust of air flow bed moisture eliminator after coal-grinding, can make coal dust in fluidized-bed or the abundant fluidisation of air flow bed moisture eliminator, can also make coal dust be dried to the appointment water content, and without setting procedure complexity and expensive pre-drying device; Invention simultaneously also consider by coal-grinding with after drying, all adopt deep bed filter to be separated with gas coal dust, the gas re-circulation after separation enters system recycling, has greatly reduced the consumption of general facilities gas.
It is low that system of the present invention has advantages of that investment in fixed assets is few, floor space is little, security of system reliably reaches running cost.Technique of the present invention can be processed powder process and the drying of high-moisture coal, reaches corresponding dry requirement the (concrete drying effect is controlled, the highest make the water-content in coal dust be down to 1.5% weight percent left and right) when making pulverized coal grinding to release mesh.Technique of the present invention is simple, easy and simple to handle, have coal-grinding concurrently simultaneously, dry multi-effect, has obvious economic benefit and social benefit.
The feed coal of year 410 tons of drying treatment of take is example, adopts powder process of the present invention and drying process, compares traditional predrying flow process, but 7,000,000 yuan of running costs are saved in 1,800 ten thousand yuan of economy system investments.
The accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention and system diagram.
Wherein: the 1-coal pulverizer, 1.1-feed coal import, 1.2-hot gas approach, 1.3-wet discharge, 2-one-level deep bed filter 1, 2.1-wet coal dust import, 2.2-wet discharge, 2.3-pneumatic outlet, the 3-fluidized-bed, 3.1-wet coal dust import, 3.2-dry pulverized coal outlet, 3.3-hot gas approach, 4-secondary deep bed filter 2, 4.1-dry pulverized coal import, 4.2-qualified discharge, 4.3-pneumatic outlet, the 5-air blower, the 6-pulverized coal firing boiler, 6.1-bunker coal import, 6.2-air intlet, 6.3-hot exhanst gas outlet, the 7-desulfurizer, the 8-tail-gas compressor.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further explained to explanation:
With reference to accompanying drawing, described coal pulverizer 1 is established feed coal import 1.1, hot gas approach 1.2, wet discharge 1.3, described one-level deep bed filter 2 is established wet coal dust import 2.1, wet discharge 2.2 and pneumatic outlet 2.3, described fluidized-bed 3 is established wet coal dust import 3.1, dry pulverized coal outlet 3.2 and hot gas approach 3.3, described secondary deep bed filter 4 is established dry pulverized coal import 4.1, qualified discharge 4.2 and pneumatic outlet 4.3, and described pulverized coal firing boiler 6 is established bunker coal import 6.1, air intlet 6.2 and hot exhanst gas outlet 6.3.
The wet discharge 1.3 of coal pulverizer 1 connects one-level deep bed filter 2, fluidized-bed 3 and deep bed filter 4 successively through pipeline.Wherein, the wet discharge 1.3 of coal pulverizer 1 is connected with the wet coal dust import 2.1 of one-level deep bed filter 2, the wet discharge 2.2 of described one-level deep bed filter 2 also can be the air flow bed moisture eliminator with fluidized-bed 3() coal dust import 3.1 be connected, the dry pulverized coal of fluidized-bed 3 outlet 3.2 is connected with the dry pulverized coal import 4.1 of deep bed filter 4.The hot exhanst gas outlet 6.3 of described pulverized coal firing boiler 6 is connected with the hot gas approach 1.2 of coal pulverizer 1.The pneumatic outlet 2.3,2.4 of described one-level deep bed filter 2 and secondary deep bed filter 4 all is connected with tail-gas compressor 8 with desulfurizer 7, and described tail-gas compressor 8 is connected with the hot exhanst gas outlet 6.3 of pulverized coal firing boiler 6.As required valve, water pump etc. can be set on described pipeline, this is routine techniques, at this, is not described further.
Processing method of the present invention is: feed coal is sent into coal pulverizer 1 by feed coal import 1.1, in coal pulverizer 1, feed coal is entered by hot gas approach 1.2 when fully being ground to the coal dust of release mesh, combustion product gases from pulverized coal firing boiler 6 is fully dry, abrasive dust and dried coal dust by wet discharge 1.3 through pipeline, wet coal dust import 2.1 is filtered to isolate gas and coal dust by air conveying to the first deep bed filter 2, coal dust after filtration is through wet discharge 2.2, wet coal dust import 3.1 deliver to again fluidized-bed 3 by through hot gas approach 3.3, enter into, from the abundant fluidisation of the combustion product gases of pulverized coal firing boiler 6 and drying, being dried to the coal dust of specifying after water content exports 3.2 with gas through dry pulverized coal and leaves fluidized-bed 3, enter secondary deep bed filter 4 through dry pulverized coal import 4.1 again, isolate gas and coal dust through deep bed filter 4, the qualified coal dust in bottom is delivered to the coal dust bunker through qualified discharge 4.2 and is stored, one-level deep bed filter 2 and secondary deep bed filter 4 top gas are after pneumatic outlet 2.3 and pneumatic outlet 4.3 discharges, most of mix (volume ratio of mixing of the gas after compression and the combustion product gases of pulverized coal firing boiler is 0.5:10 to 2:10) with the combustion product gases of pulverized coal firing boiler 6 after tail-gas compressor 8 compressions after for sending into coal pulverizer 1 and fluidized-bed 3 for dry coal dust, small portion is disposed to atmosphere emptying after desulfurizer 7 desulfurization.Can to mix in system rare gas element with the Control for Oxygen Content that guarantees system in claimed range.
Claims (5)
1. the powder process of a high moisture low-rank coal and drying process, comprise when feed coal is sent into to coal pulverizer and carried out coal-grinding fully dry by the combustion product gases from pulverized coal firing boiler, it is characterized in that, coal dust after coal-grinding and gaseous mixture are sent into the one-level deep bed filter and are filtered to isolate coal dust and gas, coal dust after filtration is sent into fluidized-bed or air flow bed moisture eliminator by the abundant fluidisation of the combustion product gases from pulverized coal firing boiler and drying, dried coal dust and gaseous mixture are sent into the secondary deep bed filter and are isolated coal dust and gas, and described coal dust is delivered to the coal dust bunker and stored.
2. powder process and the drying process of the moisture low-rank coal of height as claimed in claim 1, it is characterized in that, describedly through one-level deep bed filter and the isolated gas of secondary deep bed filter part, after the gas compressor compression with after the combustion product gases of pulverized coal firing boiler mixes, send into coal pulverizer and fluidized-bed or air flow bed moisture eliminator, rest part effluxes after treatment.
3. powder process and the drying process of the moisture low-rank coal of height as claimed in claim 2, is characterized in that, the volume ratio of mixing of the combustion product gases of described gas after gas compressor compression and pulverized coal firing boiler is 0.5:10 to 2:10.
4. the powder process for the high moisture low-rank coal of claim 1-3 any one and the system of drying process, comprise coal pulverizer, it is characterized in that, described coal pulverizer is connected successively with one-level deep bed filter, fluidized-bed or air flow bed moisture eliminator, secondary deep bed filter successively, and the hot gas approach of the gas approach of described coal pulverizer and fluidized-bed or air flow bed moisture eliminator is connected with the exhanst gas outlet of pulverized coal firing boiler.
5. powder process and the dehumidification system of the moisture low-rank coal of height as claimed in claim 4, is characterized in that, the pneumatic outlet of described one-level deep bed filter and secondary deep bed filter is connected with the hot exhanst gas outlet of pulverized coal firing boiler through tail-gas compressor.
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| CN2013103752918A CN103421568A (en) | 2013-08-26 | 2013-08-26 | High-water-content low-rank-coal pulverizing and drying process and system thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105327765A (en) * | 2015-12-10 | 2016-02-17 | 惠生工程（中国）有限公司 | High-moisture low-rank coal pulverizing and water recycling system and method |
| CN107166421A (en) * | 2017-06-28 | 2017-09-15 | 北京石油化工工程有限公司 | A kind of coal dust preparation system and method |
| CN109340809A (en) * | 2018-10-23 | 2019-02-15 | 东华工程科技股份有限公司 | The control system and method for high volatile fine coal preparation and drying process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5137539A (en) * | 1990-06-21 | 1992-08-11 | Atlantic Richfield Company | Method for producing dried particulate coal fuel and electricity from a low rank particulate coal |
| CN101015814A (en) * | 2007-02-08 | 2007-08-15 | 五环科技股份有限公司 | Technique for coal-grinding and drying |
-
2013
- 2013-08-26 CN CN2013103752918A patent/CN103421568A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5137539A (en) * | 1990-06-21 | 1992-08-11 | Atlantic Richfield Company | Method for producing dried particulate coal fuel and electricity from a low rank particulate coal |
| CN101015814A (en) * | 2007-02-08 | 2007-08-15 | 五环科技股份有限公司 | Technique for coal-grinding and drying |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105327765A (en) * | 2015-12-10 | 2016-02-17 | 惠生工程（中国）有限公司 | High-moisture low-rank coal pulverizing and water recycling system and method |
| CN105327765B (en) * | 2015-12-10 | 2018-09-04 | 惠生工程（中国）有限公司 | A kind of high-moisture low-order coal powder and water reclamation system and method |
| CN107166421A (en) * | 2017-06-28 | 2017-09-15 | 北京石油化工工程有限公司 | A kind of coal dust preparation system and method |
| CN107166421B (en) * | 2017-06-28 | 2023-09-26 | 北京石油化工工程有限公司 | Pulverized coal preparation system and method |
| CN109340809A (en) * | 2018-10-23 | 2019-02-15 | 东华工程科技股份有限公司 | The control system and method for high volatile fine coal preparation and drying process |
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Application publication date: 20131204 |