CN101881191A - Thermal power generation system based on high-moisture lignite pre-drying upgrading and recovering technology - Google Patents
Thermal power generation system based on high-moisture lignite pre-drying upgrading and recovering technology Download PDFInfo
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- CN101881191A CN101881191A CN2010101838484A CN201010183848A CN101881191A CN 101881191 A CN101881191 A CN 101881191A CN 2010101838484 A CN2010101838484 A CN 2010101838484A CN 201010183848 A CN201010183848 A CN 201010183848A CN 101881191 A CN101881191 A CN 101881191A
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- 238000001035 drying Methods 0.000 title claims abstract description 41
- 239000003077 lignite Substances 0.000 title claims abstract description 21
- 238000010248 power generation Methods 0.000 title claims abstract description 15
- 238000005516 engineering process Methods 0.000 title claims abstract description 5
- 239000003245 coal Substances 0.000 claims abstract description 74
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000002351 wastewater Substances 0.000 claims abstract description 24
- 238000009833 condensation Methods 0.000 claims abstract description 8
- 230000005494 condensation Effects 0.000 claims abstract description 8
- 238000000605 extraction Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 3
- 238000003801 milling Methods 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000428 dust Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 8
- 238000010298 pulverizing process Methods 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 239000002817 coal dust Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000002802 bituminous coal Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 208000035126 Facies Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 210000003296 saliva Anatomy 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention relates to a thermal power generation system based on a high-moisture lignite pre-drying upgrading and recovering technology. The thermal power generation system comprises a boiler, a turbine, a condenser, a condensation pump, a low pressure heater, a deaerator, a water feed pump, a high pressure heater, a wet coal bin, a wet coal feeder and a coal mill and is characterized in that a lignite pre-drying device, a drain pump, a dry coal feeder, a dust remover and a heat energy and waste water recovering device are additionally arranged in the power generation system. The invention improves the energy density of fire coal and accordingly increases the efficiency of the boiler, and is capable of reducing the investment of the boiler and a milling system by a larger extent, simultaneously reducing the plant power utilization ratio, further improving the energy source comprehensive utilization efficiency of a thermal power generation plant, recovering a great deal water by using coal to produce water and saving precious water resources. The invention achieves the effects of high efficiency, energy saving, water saving and emission reduction and accords with the industrial policy of developing the low-carbon economy in China.
Description
Technical field
The invention belongs to coal-fired thermal power generation field, relate to the improvement of boiler milling system and Steam Turbine Regenerative System.
Background technique
The explored lignite resource reserves of China reach more than 1,300 hundred million tons, account for 13% of national coal reserves.Brown coal are minimus coals in the raw coal, and fugitive constituent is generally 40%～50%, and total moisture generally can reach 20%～50%, and air-dried moisture is 10%～20%, and low heat valve generally has only 7～15MJ/kg.Because brown coal moisture height, calorific value are low, easy-weathering and spontaneous combustion, be difficult to washing and storage, cause the cost of transportation of unit energy higher, long distance is carried less economical, make the exploitation and the utilization of brown coal be very limited, generally be used as a kind of low grade fuel, near the brown coal place of production with its combustion power generation.
At present, burning high-moisture brown coal power plant is identical with using the boiler milling system of other fat coal power plant, coal-fired through conveying, broken, dry, milling enters burner hearth, to reach the requirement of satisfying boiler burning.Because the moisture of brown coal own is higher, the boiler exhaust gas loss is bigger with the Reduced or Low Moisture coal facies, and the thermal efficiency that boiler directly burns is lower, and Economy is limited, and the discharge amount of greenhouse gases is also bigger.In addition, high-moisture brown coal calorific value is lower, makes boiler body bulky, involves great expense; The boiler accessory machinery capacity is bigger than normal, and station service power consumption rate is higher.
Summary of the invention
At the problems referred to above, the present invention improves burning high-moisture brown coal thermal power generation system, its technological scheme is to set up the coal-fired pre-drying device of superheated vapor and dried tail gas heat energy and waste water recovering device in thermal power generation system, the thermal power plant system that forms New-type boiler pulverizing system and Steam Turbine Regenerative System, concrete structure is as follows: a kind of thermal power generation system based on predrying upgrading of high-moisture brown coal and recovery technology, comprise boiler, steam turbine, vapour condenser, condensate pump, low-pressure heater, oxygen-eliminating device, feed water pump, high-pressure heater, wet coal bunker, wet coal coal-feeding conveyer, coal pulverizer, it is characterized in that in power generation system, setting up the brown coal pre-drying device, drainage pump, the dry coal coal-feeding conveyer, deduster, heat energy and waste water recovering device, the steam turbine low-pressure extraction opening is connected to the drying apparatus steam inlet, drying apparatus water of condensation interface is connected to drainage pump, and drainage pump is connected to oxygen-eliminating device; Wet coal coal-feeding conveyer is connected to drying apparatus coal inlet, and the drying apparatus coal export is connected to the dry coal coal-feeding conveyer, and the outlet of dry coal coal-feeding conveyer is connected to coal pulverizer; The drying apparatus steam (vapor) outlet is connected to deduster, and the coal export of deduster is connected to the dry coal coal-feeding conveyer; The steam outlet of deduster is connected to heat energy and waste water recovering device, heat energy and waste water recovering device drain opening are connected to the power plant effluent processing system, the condensate pump outlet is connected to heat energy and waste water recovering device, and heat energy and waste water recovering device water out are connected to condensing water conduit.
Working procedure of the present invention is as follows:
The high-moisture brown coal of storing in the wet coal bunker enter drying apparatus by wet coal coal-feeding conveyer from top, heat the most of evaporation of former moisture content of coal by extracted steam from turbine, dry coal is discharged from the drying apparatus bottom and is entered the dry coal coal-feeding conveyer, enters coal pulverizer and mills and continue and be delivered to the boiler furnace burning behind the heat drying.The water vapor of drying apparatus evaporation and the mixture of coal dust enter the deduster purifying and dedusting, and the coal dust that separates enters the dry coal coal-feeding conveyer, enter the boiler furnace burning after entering coal pulverizer.Water vapor after the purification enters heat energy and waste water recovering device condensation heat, enters the power plant effluent processing system behind the formation supercooled water, and incondensable gas enters atmosphere.Condensate pump goes out saliva and is connected to heat energy and waste water recovering device, is connected to condensing water conduit after temperature is opened in heat absorption.
The invention has the beneficial effects as follows:
1, integrated drying system in original pulverizing system, the high-moisture brown coal preheat drying through dryer, former moisture content of coal can reduce more than 50%, the energy density of coal improves more than 40%, the fire coal that enters the burner hearth burning reduces the heat energy that the surplus water branch consumes in the evaporation coal through preheating moisture minimizing simultaneously, and the flue gas loss of boiler is reduced, efficiency of boiler can improve 1.5～2.5%, reaches bituminous coal type boiler level.
2, coal-fired low heat valve increases substantially behind the brown coal drying, reaches the bituminous coal level, and the boiler furnace volume reduces, and highly reduces, and investment reduces; Moisture reduces, and the energy density of coal improves, and the pulverizing system drying is exerted oneself and guaranteed, pulverizing system can be selected the medium-speed pulverizer pulverizing system, and investment reduces; The pulverizing system plant capacity reduces, and station service power consumption rate reduces more than 0.5%.
3, the steam turbine low-pressure heat drying fire coal that draws gas, the hydrophobic oxygen-eliminating device that enters of heating steam, dryer and heat energy and waste water recovering device are formed special water of condensation heater, the evaporation steam discharge heat-setting water of coal, form the Heating Cyclic of drawing gas, be an integrated new system with coal-fired drying and feedwater heating function in original thermodynamic system of steam tur, extracted steam from turbine heat energy is fully used.Coal-fired drying has increased power plant's backheat circulation steam flow that draws gas, and is implemented in and reduces turbine discharge the generated energy permanence condition under, reduces cold junction and loses 5%, has improved the plant thermal efficiency of power plant.
4, the large quantity of moisture that evaporates in the coal obtains reclaiming, and 600MW unit year can reach 500,000 tons with coal system water, reduces the thermal power plant water consumption effectively.
5,, adopt the present invention can reduce generating standard coal consumption 8-12g/KWh, SO with the contrast of capacity unit
2, flue dust, NO
X, CO
2Annual emissions reduces 7.5%, 7.5%, 10%, 4% respectively.
In sum, the present invention has improved coal-fired energy density, and the efficient of boiler improves thereupon, can reduce the investment of boiler and pulverizing system greatly; Reduced station service power consumption rate simultaneously, and then improved thermal power plant comprehensive utilization of energy efficient, with the recyclable big water gaging of coal system water, saves valuable water resources.That the present invention reaches is efficient, energy-conservation, water saving, the effect that reduces discharging, meets the industrial policy of present national development low-carbon economy.
Description of drawings
Accompanying drawing is a system of the present invention connection diagram.
Legend:
1, boiler; 2, steam turbine; 3, vapour condenser; 4, condensate pump; 5, low-pressure heater; 6, oxygen-eliminating device; 7, feed water pump; 8, high-pressure heater; 9, wet coal bunker; 10, wet coal coal-feeding conveyer; 11, drying apparatus; 12, dry coal coal-feeding conveyer; 13, coal pulverizer; 14, drainage pump; 15, deduster; 16, heat energy and waste water recovering device
Embodiment
Below in conjunction with accompanying drawing technological scheme of the present invention is further described:
Boiler (1) steam (vapor) outlet by main steam line be connected with steam turbine (2), turbine discharge is connected with vapour condenser (3), condenser condensed water outlet low pressure feed water pipeline connects condensate pump (4) successively, low-pressure heater (5) to oxygen-eliminating device (6), deaerator feedwater outlet high-pressure feed water pipeline connects feed water pump (7), high-pressure heater (8) successively to the boiler feed water inlet, forms conventional thermal power generation circulation system; The steam turbine low-pressure extraction opening is connected to the drying apparatus steam inlet, and drying apparatus water of condensation interface is connected to drainage pump, and drainage pump is connected to oxygen-eliminating device; Wet coal coal-feeding conveyer is connected to drying apparatus coal inlet, and the drying apparatus coal export is connected to the dry coal coal-feeding conveyer, and the outlet of dry coal coal-feeding conveyer is connected to coal pulverizer; The drying apparatus steam (vapor) outlet is connected to deduster, and the coal export of deduster is connected to the dry coal coal-feeding conveyer; The steam outlet of deduster is connected to heat energy and waste water recovering device, heat energy and waste water recovering device drain opening are connected to the power plant effluent processing system, the condensate pump outlet is connected to heat energy and waste water recovering device, and heat energy and waste water recovering device water out are connected to condensing water conduit.
The present embodiment working principle is as follows:
The low-pressure superheated steam that the steam turbine low-pressure extraction opening is extracted out is connected to drying apparatus (11) by pump-line, low-pressure superheated steam discharges the sensible heat and the latent heat of condensation to condensing into behind the hydrogenous coal in the drying apparatus with the saturation water under the equal pressure by the indirect heat exchange mode in drying apparatus, saturation water is connected to oxygen-eliminating device after boosting by drainage pump (14), enter the steam turbine water supply system, finish the circulation of drawing gas.
The high-moisture brown coal of storage enter drying apparatus by wet coal coal-feeding conveyer (10) from top in the wet coal bunker (9), heat by extracted steam from turbine, the most of evaporation of moisture content of coal, dry coal after the dry heat is discharged from the drying apparatus bottom and is entered dry coal coal-feeding conveyer (12), enters coal pulverizer (13) and mills and continue and be delivered to the boiler furnace burning behind the heat drying.
The water vapor of drying apparatus evaporation and the mixture of coal dust enter deduster (15) purifying and dedusting, and the coal dust that separates enters the dry coal coal-feeding conveyer, enter the boiler furnace burning after entering coal pulverizer;
Water vapor after deduster purifies enters heat energy and waste water recovering device (16) condensation heat, enters the power plant effluent processing system behind the formation supercooled water, and incondensable gas enters atmosphere.
The condensate pump outlet is drawn one road low-temperature condensate and is connected to heat energy and waste water recovering device, heat energy and waste water recovering device water out are connected to condensing water conduit, low-temperature condensate enters condensate system again at the heat of heat energy and waste water recovering device absorption water vapor after the intensification.
The described drying apparatus of present embodiment can be a steam tubular type rotary dryer, also can be superheated vapor fluidisation bed dryer.
Claims (1)
1. based on the thermal power generation system of predrying upgrading of high-moisture brown coal and recovery technology, comprise boiler, steam turbine, vapour condenser, condensate pump, low-pressure heater, oxygen-eliminating device, feed water pump, high-pressure heater, wet coal bunker, wet coal coal-feeding conveyer, coal pulverizer, it is characterized in that in power generation system, setting up brown coal pre-drying device, drainage pump, dry coal coal-feeding conveyer, deduster, heat energy and waste water recovering device, the steam turbine low-pressure extraction opening is connected to the drying apparatus steam inlet, drying apparatus water of condensation interface is connected to drainage pump, and drainage pump is connected to oxygen-eliminating device; Wet coal coal-feeding conveyer is connected to drying apparatus coal inlet, and the drying apparatus coal export is connected to the dry coal coal-feeding conveyer, and the outlet of dry coal coal-feeding conveyer is connected to coal pulverizer; The drying apparatus steam (vapor) outlet is connected to deduster, and the coal export of deduster connects as for the coal coal-feeding conveyer; The steam outlet of deduster is connected to heat energy and waste water recovering device, heat energy and waste water recovering device drain opening are connected to the power plant effluent processing system, the condensate pump outlet is connected to heat energy and waste water recovering device, and heat energy and waste water recovering device water out are connected to condensing water conduit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010183848A CN101881191B (en) | 2010-05-27 | 2010-05-27 | Thermal power generation system based on high-moisture lignite pre-drying upgrading and recovering technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010183848A CN101881191B (en) | 2010-05-27 | 2010-05-27 | Thermal power generation system based on high-moisture lignite pre-drying upgrading and recovering technology |
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| Publication Number | Publication Date |
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| CN101881191A true CN101881191A (en) | 2010-11-10 |
| CN101881191B CN101881191B (en) | 2012-10-17 |
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Cited By (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095192A (en) * | 2011-02-12 | 2011-06-15 | 施大钟 | Lignite combustion boiler of power plant |
| CN102155744A (en) * | 2010-12-22 | 2011-08-17 | 上海锅炉厂有限公司 | System for pre-drying coal with high water content by utilizing residual heat of boiler gas |
| CN102353237A (en) * | 2011-08-18 | 2012-02-15 | 西安交通大学 | High-moisture-content lignite predrying method and system integrated with thermal power plant |
| CN102759118A (en) * | 2011-04-29 | 2012-10-31 | 中国电力工程顾问集团华北电力设计院工程有限公司 | Lignite drum smoke pre-drying power generation integrated system and process |
| CN102889609A (en) * | 2011-07-20 | 2013-01-23 | 上海机易电站设备有限公司 | Pulverizing system of smoke drying lignite coal steel ball mill |
| CN102944024A (en) * | 2012-11-09 | 2013-02-27 | 中国神华能源股份有限公司 | Lignite thermal power generation system |
| CN103060038A (en) * | 2012-12-25 | 2013-04-24 | 中国五环工程有限公司 | Process and system for preparing dry coal dust with high-moisture low-order raw coal |
| CN103673534A (en) * | 2013-12-06 | 2014-03-26 | 苏杰 | Brown coal drying water-lifting recycling system using waste heat of power plant |
| CN103807868A (en) * | 2014-03-12 | 2014-05-21 | 华北电力大学 | Inner heating fluidized bed drying system applicable to brown coal air cooling generator set |
| CN103925606A (en) * | 2014-04-04 | 2014-07-16 | 西安西热锅炉环保工程有限公司 | High-moisture lignite medium-speed coal mill pulverizing system heating primary air through coal gas burning |
| CN103983088A (en) * | 2014-05-20 | 2014-08-13 | 西安热工研究院有限公司 | System and method for predrying lignite and recycling water by using waste heat of power station |
| CN104179537A (en) * | 2014-08-18 | 2014-12-03 | 北京电力设备总厂 | Brown coal drying power generating system capable of recycling water in coal and implementation method of brown coal drying power generating system |
| CN104880051A (en) * | 2015-06-01 | 2015-09-02 | 南京航空航天大学 | Biomass drying system for synchronously recovering latent heat and sensible heat and method |
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| WO2015176570A1 (en) * | 2014-05-20 | 2015-11-26 | 天华化工机械及自动化研究设计院有限公司 | Method and apparatus for high-moisture, lower heating value lignite drying and water recovery in generator set |
| CN105157398A (en) * | 2015-07-13 | 2015-12-16 | 华北电力大学 | Two-stage raw coal drying system and method applied to air cooling unit |
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Cited By (37)
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| CN102155744A (en) * | 2010-12-22 | 2011-08-17 | 上海锅炉厂有限公司 | System for pre-drying coal with high water content by utilizing residual heat of boiler gas |
| CN102155744B (en) * | 2010-12-22 | 2012-11-14 | 上海锅炉厂有限公司 | System for pre-drying coal with high water content by utilizing residual heat of boiler gas |
| CN102095192A (en) * | 2011-02-12 | 2011-06-15 | 施大钟 | Lignite combustion boiler of power plant |
| CN102759118A (en) * | 2011-04-29 | 2012-10-31 | 中国电力工程顾问集团华北电力设计院工程有限公司 | Lignite drum smoke pre-drying power generation integrated system and process |
| CN102889609B (en) * | 2011-07-20 | 2016-03-16 | 上海援梦电力能源科技咨询中心 | Smoke drying steel ball brown-coal milling system |
| CN102889609A (en) * | 2011-07-20 | 2013-01-23 | 上海机易电站设备有限公司 | Pulverizing system of smoke drying lignite coal steel ball mill |
| CN102353237A (en) * | 2011-08-18 | 2012-02-15 | 西安交通大学 | High-moisture-content lignite predrying method and system integrated with thermal power plant |
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| CN103060038A (en) * | 2012-12-25 | 2013-04-24 | 中国五环工程有限公司 | Process and system for preparing dry coal dust with high-moisture low-order raw coal |
| CN103673534A (en) * | 2013-12-06 | 2014-03-26 | 苏杰 | Brown coal drying water-lifting recycling system using waste heat of power plant |
| CN103673534B (en) * | 2013-12-06 | 2016-07-13 | 大唐国际发电股份有限公司内蒙古分公司 | Utilize residual heat of electric power plant drying brown coal water lift recovery system |
| CN103807868A (en) * | 2014-03-12 | 2014-05-21 | 华北电力大学 | Inner heating fluidized bed drying system applicable to brown coal air cooling generator set |
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