CN103343954B - Quality-improved lignite combustion or blending combustion system - Google Patents
Quality-improved lignite combustion or blending combustion system Download PDFInfo
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- CN103343954B CN103343954B CN201310322906.0A CN201310322906A CN103343954B CN 103343954 B CN103343954 B CN 103343954B CN 201310322906 A CN201310322906 A CN 201310322906A CN 103343954 B CN103343954 B CN 103343954B
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- water
- lignite
- brown coal
- economizer
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention belongs to the field of large-scale power station boiler systems, and particularly relates to a quality-improved lignite combustion or blending combustion system. The system is characterized in that an water outlet of an economizer of a power station boiler is connected with a water inlet of a drying roller through a shunt valve, a steam outlet of the drying roller is connected with a separator, a water outlet of the drying roller is connected in series with a circulating pump and a mixer and then is connected with a water inlet of the economizer; a lignite outlet of the drying roller is connected with an inlet of a lignite feeder of the power station boiler, and a branch of the shunt valve is connected with a water wall connecting box of a hearth; the dry quantity of lignite is determined according to a blending combustion proportion, and the quantity of a drying agent is determined according to a lignite drying requirement. On one hand, the system can dry the lignite, the influence of lignite blending combustion to the boiler is reduced in a high limit manner, on the other hand, a large number of moisture can be recycled after the lignite is dried, and can be utilized as power station industrial water.
Description
Technical field
The invention belongs to large-sized station boiler system regions, particularly a kind of brown coal upgrading after-combustion or mix burning system, be mainly used in burning and mix the Large Copacity controlled circulating boiler and super (super-) critical steam generator system that burn high water content brown coal.
Background technology
Due to the energy resource structure feature of China, thermal power generation remains topmost forms of electricity generation.Thermal power generation coal is divided into three major types according to degree of coalification: brown coal, bituminous coal, anthracite.Bituminous coal is because its good character is widely used in generating, and recently along with its price of bituminous coal supply growing tension rises steadily, many power plant all adopt the mode of burning or mixing burning brown coal to solve the problem that bituminous coal is in short supply and cost of electricity-generating is high.Brown coal as the main feature of colm are: volatile matter content is high, moisture high-low position caloric value is little, ash fusion point is lower.
Due to the above feature of brown coal, brown coal are mixed burning and are easily occurred following problem:
Because brown coal moisture is high, when bituminous coal mixes burning brown coal, there will be drying capacity and sharply decline, cause the too low situation of pulverized coal preparation system pulverizer outlet temperature, affect boiler and burn stable with low load combustion completely; Brown coal volatile matter content is high, the dangerous working condition that the too high meeting of drying capacity causes pulverized coal preparation system to catch fire or explodes; The caloric value of brown coal is low, and compared with under bituminous coal same load, total fuel consumption increases, and exhaust gas volumn can increase, and pressure fan, air-introduced machine may be exerted oneself needs transformation not; Exhaust gas volumn increases heat convection also can be made to strengthen in addition, causes superheated steam, reheated steam overtemperature, even makes that wall temperature of heated surface is too high causes pipe explosion accident; Lignite ash fusing point is low, and easily cause burner hearth, burner region coking, burnt problem hung by superheater, reheater.
Existing brown coal burning and mix the solution that burning scheme takes for above problem and be:
Extract stove cigarette dry, sent into by flue gas in coal pulverizer, high temperature or middle temperature flue gas are sent into coal pulverizer and are reduced pulverized coal preparation system oxygen content, reduce explosion of Coal Pulverizing System danger, improve drying capacity of pulverizer simultaneously; Carry out the performances such as boiler thermodynamic calculation, pulverized coal preparation system calculation and check, cigarette wind to the new system extracting the drying of stove cigarette to calculate; Change the burner being applicable to brown coal, carry out firing optimization optimization.
Dry from extracted steam from turbine, the Quality advance of brown coal after dry, moisture reduces, and low heat valve increases.Before relatively dry, the impact of pulverized coal preparation system drying capacity is reduced; Fuel Consumption reduces, and exhaust gas volumn change is little, reduces pressure fan, air-introduced machine, heating surface convection current at different levels caloric receptivity, heating surface tube wall temperature at different levels impact.Brown coal drying machine need be introduced from extracted steam from turbine drying brown coal and consume a certain amount of extracted steam from turbine, steam turbine is had a certain impact, need boiler capacity be improved.
Stove is smoked in employing and the measure of the drying brown coal that draws gas can to some extent solve problem, but yet there are some problems, the limit of coal pulverizer may be exceeded as smoked stove raising drying medium temperature, smoking stove causes exhaust gas volumn after extraction point to reduce, after making extraction point, heating surface caloric receptivity reduces, and especially the minimizing of air preheater caloric receptivity causes primary and secondary air temperature drop low; The drying brown coal that draws gas makes steam turbine acting quantity of steam reduce, and improves evaporation capacity and also can cause certain influence to boiler.This patent is directed to above problem and proposes a kind of brown coal drying and upgrading and mix burning design method.
Summary of the invention
Propose a kind of brown coal upgrading after-combustion herein or mix burning system, farthest reducing brown coal and mix the high impact on steam generator system of moisture in burning process.
The technical solution used in the present invention is:
The afterbody port of export of station boiler is provided with low-temperature reheater, low temperature superheater and economizer; The delivery port of economizer is connected with the water inlet of roller drier by shunt valve, and the vapor outlet port of roller drier is connected with separator, and water out and circulating pump, blender are connected with the water inlet of tubular air preheater after connecting; The brown coal outlet of roller drier is connected with the feeder entrance of station boiler, and a branch road of shunt valve is connected with the water screen header of burner hearth.
Described roller drier adopts indirect heat exchange mode.
A branch road of described blender is connected with the delivery port of high-pressure heater, and the water outlet of high-pressure heater is sent to economizer and is participated in circulating after mixing with the water outlet of roller drier.
The evaporation water that described separator is separated is sent into condenser condensation and is collected as power station water for industrial use, and isolated coal dust is sent to coal pulverizer.
Beneficial effect of the present invention is:
This system on the one hand can drying brown coal, reduces brown coal to greatest extent and mixes and burn and impact on boiler; Large quantity of moisture can be reclaimed, as power station water for industrial use on the other hand after brown coal drying.Such as, mixing burning brown coal ratio for 1000MW unit is 70%, and brown coal total moisture is dried to about 15%-20% from 30-50% according to ature of coal situation, needs the coal after drying and upgrading to be about 300t/h, is about 380t/h to the brown coal in requisition for drying.Drying brown coal needs the economizer water yield to be about 250t/h, reclaims brown coal drying transpiring moisture and is about 70t/h.
Accompanying drawing explanation
Fig. 1 is brown coal upgrading mixed burning boiler system;
Fig. 2 is the calculation flow chart of brown coal consumption, drying water consumption.
Number in the figure:
1-feeder; 2-coal pulverizer; 3-separator; 4-pulverized coal distributor; 5-burner; 6-burner hearth; 7-pendant superheater; 8-high temperature superheater; 9-high temperature reheater; 10-low-temperature reheater; 11-low temperature superheater; 12-economizer; 13-rotary regenerative air preheater; 14-overfire air fan; 15-primary air fan; 16-shunt valve; 17-roller drier; 18-separator; 19-circulating pump; 20-blender;
Detailed description of the invention
The invention provides a kind of brown coal upgrading after-combustion or mix burning system, below in conjunction with the drawings and specific embodiments, the present invention will be further described.
This system is to add brown coal drying and upgrading part relative to the change of original steam generator system, as shown in Figure 1.Feeder 1 is connected with coal pulverizer 2, coal pulverizer 2 is connected with the burner 5 on burner hearth 6 by separator 3 and pulverized coal distributor 4, the top of burner hearth 6 sets gradually pendant superheater 7, high temperature superheater 8 and high temperature reheater 9 along flue, and the flue tail end of burner hearth 6 arranges low-temperature reheater 10, low temperature superheater 11 and economizer 12; The flue end of burner hearth 6 connects rotary regenerative air preheater 13; Be connected to burner 5 after the air-out of overfire air fan 14 and rotary regenerative air preheater 13 heat exchange, be connected to coal pulverizer 2 or be directly connected to coal pulverizer 2 after the air-out of primary air fan 15 and rotary regenerative air preheater 13 heat exchange.
The delivery port of economizer 12 is connected with the water inlet of roller drier 17 by shunt valve 16, and the vapor outlet port of roller drier 17 is connected with separator 18, and water out is connected with the water inlet of tubular air preheater 12 after connecting with circulating pump 19, blender 20; The brown coal outlet of roller drier 17 is connected with the feeder entrance of station boiler, and a branch road of shunt valve 16 is connected with the water screen header of burner hearth.
During use, according to brown coal drying requirement, the heat Balance Calculation of carrying out roller drier determines the moisture of the heat that dry every kilogram of brown coal need and evaporation.Calculate according to brown coal fuel mixing ratio and need dry brown coal amount, determine the dry total amount of heat needing to consume.Dry water consumption is determined according to the thermal discharge of every kilogram of economizer exit water in drying machine.Under the condition ensureing boiler capacity, flow and the economizer out temperature that can make to enter economizer can change, and need iterative computation to determine.Calculation process as shown in Figure 2.
The feature of this system can be found out from above drying system transformation calculation process.A certain amount of water increases a shunt valve 16 after entering the heat absorption of former economizer on the pipeline that it is sent to furnace wall cooling header, and the effect of shunt valve 16 mixes according to brown coal to dryout dry requirement and dry amount determines dry dosage.Be cylindrical drier 17 after shunt valve 16, cylindrical drier 17 adopts indirect heat exchange mode, and dried water adds water to enter in economizer after blender 20 mixes with height and recycles after circulating pump 19 pressurizes.Coal after cylindrical drier 17 drying and upgrading directly sends into coal pulverizer 2, and the water of dry evaporation is collected through condensation.
Claims (4)
1. brown coal upgrading after-combustion or mix a burning system, is characterized in that, the afterbody port of export of station boiler is provided with low-temperature reheater (10), low temperature superheater (11) and economizer (12); The delivery port of economizer (12) is connected with the water inlet of roller drier (17) by shunt valve (16), the vapor outlet port of roller drier (17) is connected with separator (18), and water out and circulating pump (19), blender (20) are connected with the water inlet of economizer (12) after connecting; The brown coal outlet of roller drier (17) is connected with the feeder entrance of station boiler, and a branch road of shunt valve (16) is connected with the water screen header of burner hearth.
2. a kind of brown coal upgrading after-combustion according to claim 1 or mix burning system, is characterized in that, described roller drier (17) adopts indirect heat exchange mode.
3. a kind of brown coal upgrading after-combustion according to claim 1 or mix burning system, it is characterized in that, a branch road of described blender (20) is connected with the delivery port of high-pressure heater, is sent to economizer (12) and participates in circulating after the water outlet of high-pressure heater mixes with the water outlet of roller drier (17).
4. a kind of brown coal upgrading after-combustion according to claim 1 or mix burning system, is characterized in that, the evaporation water that described separator (18) is separated is sent into condenser condensation and collected as power station water for industrial use, and isolated coal dust is sent to coal pulverizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310322906.0A CN103343954B (en) | 2013-07-29 | 2013-07-29 | Quality-improved lignite combustion or blending combustion system |
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| CN201310322906.0A CN103343954B (en) | 2013-07-29 | 2013-07-29 | Quality-improved lignite combustion or blending combustion system |
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| CN103343954A CN103343954A (en) | 2013-10-09 |
| CN103343954B true CN103343954B (en) | 2015-04-15 |
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| CN107289444B (en) * | 2017-07-18 | 2019-03-01 | 西安交通大学 | A kind of ultralow volatile matter carbon-based fuel and the low NOx of lignite mix the system and method for burning |
| CN112460578A (en) * | 2020-11-23 | 2021-03-09 | 西安热工研究院有限公司 | Method and system for utilizing east China coal |
| CN113446616A (en) * | 2021-07-28 | 2021-09-28 | 西安热工研究院有限公司 | Power generation system and method for directly burning and coupling biomass briquette fuel by using standby coal mill |
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|---|---|---|---|---|
| DE4124842A1 (en) * | 1991-07-26 | 1993-01-28 | Evt Energie & Verfahrenstech | Steam boiler fired with pulverised brown coal - uses combustion gases to dry coal and reduce nitrous oxide content of gases discharged to atmosphere |
| CN101476814A (en) * | 2008-12-24 | 2009-07-08 | 大唐国际化工技术研究院有限公司 | Low-rank coal drying method and system |
| CN201697441U (en) * | 2010-07-12 | 2011-01-05 | 山东天力干燥设备有限公司 | Indirect heat exchanging drying low-rank coal utilization system of pumped steam of thermal power plant |
| CN202132964U (en) * | 2011-05-27 | 2012-02-01 | 中国电力工程顾问集团东北电力设计院 | Fan mill front counter flow type furnace-smoke drying dewatering direct blowing pulverizer system |
| 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 |
-
2013
- 2013-07-29 CN CN201310322906.0A patent/CN103343954B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4124842A1 (en) * | 1991-07-26 | 1993-01-28 | Evt Energie & Verfahrenstech | Steam boiler fired with pulverised brown coal - uses combustion gases to dry coal and reduce nitrous oxide content of gases discharged to atmosphere |
| CN101476814A (en) * | 2008-12-24 | 2009-07-08 | 大唐国际化工技术研究院有限公司 | Low-rank coal drying method and system |
| CN201697441U (en) * | 2010-07-12 | 2011-01-05 | 山东天力干燥设备有限公司 | Indirect heat exchanging drying low-rank coal utilization system of pumped steam of 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 |
| CN202132964U (en) * | 2011-05-27 | 2012-02-01 | 中国电力工程顾问集团东北电力设计院 | Fan mill front counter flow type furnace-smoke drying dewatering direct blowing pulverizer system |
Non-Patent Citations (1)
| Title |
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| "基于炉烟干燥及水回收风扇磨仓储式制粉系统的高效褐煤发电技术";马有福等;《中国电机工程学报》;20130215;第33卷(第5期);全文 * |
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