CN103343954A - Quality-improved lignite combustion or blending combustion system - Google Patents
Quality-improved lignite combustion or blending combustion system Download PDFInfo
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- CN103343954A CN103343954A CN2013103229060A CN201310322906A CN103343954A CN 103343954 A CN103343954 A CN 103343954A CN 2013103229060 A CN2013103229060 A CN 2013103229060A CN 201310322906 A CN201310322906 A CN 201310322906A CN 103343954 A CN103343954 A CN 103343954A
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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
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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 field, particularly a kind of brown coal upgrading after-combustion or mix the burning system is mainly used in burning and mixing big volume controlled combined-circulation once-through boiler and super (surpassing) the critical steam generator system that burns the high-moisture brown coal.
Background technology
Because the energy resource structure characteristics of China, thermal power generation remains topmost forms of electricity generation.Thermal power generation is divided into three major types with coal according to degree of coalification: brown coal, bituminous coal, anthracite.Bituminous coal is because its good properties is widely used in generating, and recently along with its price of bituminous coal supply growing tension rises steadily, the mode that many power plant all adopt burning or mix burning brown coal solves 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: the high and low position of volatile matter content height, moisture caloric value is little, ash fusion point is lower.
Because the above characteristics of brown coal, brown coal are mixed the following problem that is prone to of burning:
Because brown coal moisture height, when bituminous coal is mixed burning brown coal, drying can occur and exert oneself and sharply descend, cause pulverized coal preparation system coal pulverizer outlet temperature to cross low situation, influence boiler completing combustion and low load combustion and stablize; Brown coal volatile matter content height, the drying dangerous operating mode that too high meeting causes pulverized coal preparation system to catch fire or explodes of exerting oneself; The caloric value of brown coal is low, and compares under the bituminous coal same load, and total fuel consumption increases, and exhaust gas volumn can increase, and pressure fan, air-introduced machine may be exerted oneself to be needed to transform inadequately; The exhaust gas volumn increase also can make heat convection strengthen in addition, causes superheated steam, reheated steam overtemperature, even makes the too high pipe explosion accident that causes of heating surface wall temperature; The lignite ash fusing point is low, easily causes burner hearth, burner region coking, and superheater, reheater are hung burnt problem.
Existing brown coal burning and mix the solution that the burning scheme takes for above problem and be:
Extract stove cigarette drying, flue gas is sent in the coal pulverizer, high temperature or middle temperature flue gas are sent into coal pulverizer and have been reduced the pulverized coal preparation system oxygen content, have reduced explosion of Coal Pulverizing System danger, improve drying capacity of pulverizer simultaneously; The new system that extracts stove cigarette drying being carried out performances such as boiler heating power calculates, pulverized coal preparation system check calculating, cigarette wind calculates; Change the burner that is fit to brown coal, burn to adjust and optimize.
From the extracted steam from turbine drying, the quality of dry back brown coal improves, and moisture reduces, and low heat valve increases.The influence of exerting oneself reduces to the pulverized coal preparation system drying before the relatively dry; Fuel Consumption reduces, and exhaust gas volumn changes little, and pressure fan, air-introduced machine, heating surface convection current at different levels caloric receptivity, heating surface tube wall temperature at different levels influence are reduced.Need introduce the brown coal drying machine and consume a certain amount of extracted steam from turbine from the dry brown coal of extracted steam from turbine, steam turbine is had certain influence, need to improve boiler capacity.
Stove is smoked in employing and the measure of the dry brown coal that draw gas can solve problem to a certain extent, but yet there are some problems, as smoke stove and improve the limit that the drying medium temperature may surpass coal pulverizer, smoke stove and cause that exhaust gas volumn reduces after the extraction point, make that the heating surface caloric receptivity reduces after the extraction point, especially the air preheater caloric receptivity reduces and causes the primary and secondary air temperature drop low; The dry brown coal that draw gas reduce steam turbine acting quantity of steam, improve evaporation capacity and also can cause certain influence to boiler.This patent is directed to above problem and has proposed a kind of brown coal drying and upgrading and mix the burning design method.
Summary of the invention
This paper has proposed a kind of brown coal upgrading after-combustion or has mixed the burning system, farthest reduces brown coal and mixes in the burning process moisture height to the influence of steam generator system.
The technical solution used in the present invention is:
The afterbody port of export at 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 is connected with the water inlet of tubular air preheater with circulating pump, blender series connection back; 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 the indirect heat exchange mode.
A branch road of described blender is connected with the delivery port of high-pressure heater, the water outlet of high-pressure heater be sent to economizer after the water outlet of roller drier mixes and participate in circulation.
The evaporation water that described separator separates is sent into condenser and is condensed collection as the 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 dry brown coal, reduce brown coal to greatest extent and mix and burn and to the influence of boiler; Can reclaim large quantity of moisture behind the brown coal drying on the other hand, as the power station water for industrial use.For example, mixing the burning brown coal ratio for the 1000MW unit is 70%, and the brown coal total moisture is dried to about 15%-20% according to the ature of coal situation from 30-50%, needs the about 300t/h of coal behind the drying and upgrading, in requisition for the about 380t/h of the brown coal of drying.Dry brown coal need the about 250t/h of the economizer water yield, reclaim the about 70t/h of brown coal drying transpiring moisture.
Description of drawings
Fig. 1 is brown coal upgrading mixed burning boiler system;
Fig. 2 is the calculation flow chart of brown coal consumption, dry water consumption.
Number in the figure:
The 1-feeder; The 2-coal pulverizer; The 3-separator; The 4-pulverized coal distributor; The 5-burner; The 6-burner hearth; The 7-pendant superheater; The 8-high temperature superheater; The 9-high temperature reheater; The 10-low-temperature reheater; The 11-low temperature superheater; The 12-economizer; The 13-rotary regenerative air preheater; The 14-overfire air fan; The 15-primary air fan; The 16-shunt valve; The 17-roller drier; The 18-separator; The 19-circulating pump; The 20-blender;
The specific embodiment
The invention provides a kind of brown coal upgrading after-combustion or mix the burning system, the present invention will be further described below in conjunction with the drawings and specific embodiments.
This system is to have increased the brown coal drying and upgrading part with respect 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 burner 5 on the 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 terminal rotary regenerative air preheater 13 that connects of the flue of burner hearth 6; 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 with circulating pump 19, blender 20 series connection backs; 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 the brown coal drying requirement, carry out the heat Balance Calculation of roller drier and determine heat and the moisture evaporated that dry every kilogram of brown coal need.Mix the brown coal amount of burning than calculating the needs drying according to brown coal, determine that drying needs the total amount of heat that consumes.Determine dry water consumption according to the thermal discharge of every kilogram of economizer exit water in drying machine.Under the condition that guarantees boiler capacity, can make the flow and the economizer out temperature that enter economizer to change, need iterative computation to determine.Calculation process as shown in Figure 2.
Transform the calculation process characteristics of this system as can be seen from above drying system.After a certain amount of water enters the heat absorption of former economizer, increase a shunt valve 16 at its pipeline that is sent to the furnace wall cooling header, the effect of shunt valve 16 is to mix according to brown coal to dryout dry requirement and dry amount is determined dry dosage.Be cylindrical drier 17 behind the shunt valve 16, cylindrical drier 17 adopts the indirect heat exchange modes, and dried water enters in the economizer after blender 20 mixes with Gao Jiashui after circulating pump 19 pressurizations and recycles.Coal behind cylindrical drier 17 drying and upgradings is directly sent into coal pulverizer 2, and the water of dry evaporation is collected through condensation.
Claims (4)
1. a brown coal upgrading after-combustion or mix the burning system is characterized in that, is provided with low-temperature reheater (10), low temperature superheater (11) and economizer (12) at the afterbody port of export of station boiler; 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 is connected with the water inlet of tubular air preheater (12) with circulating pump (19), blender (20) series connection back; 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 the burning system is characterized in that, described roller drier (17) adopts the indirect heat exchange mode.
3. a kind of brown coal upgrading after-combustion according to claim 1 or mix the burning system, it is characterized in that, a branch road of described blender (20) is connected with the delivery port of high-pressure heater, the water outlet of high-pressure heater be sent to economizer (12) after the water outlet of roller drier (17) mixes and participate in circulation.
4. a kind of brown coal upgrading after-combustion according to claim 1 or mix the burning system is characterized in that, the evaporation water that described separator (18) separates is sent into condenser and condensed and collect as the 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 true CN103343954A (en) | 2013-10-09 |
| CN103343954B CN103343954B (en) | 2015-04-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107289444A (en) * | 2017-07-18 | 2017-10-24 | 西安交通大学 | A kind of ultralow volatile matter carbon-based fuel and the low NO of ligniteXMix 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 |
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| 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)
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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 |
| 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)
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| 马有福等: ""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"", 《中国电机工程学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107289444A (en) * | 2017-07-18 | 2017-10-24 | 西安交通大学 | A kind of ultralow volatile matter carbon-based fuel and the low NO of ligniteXMix 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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| CN103343954B (en) | 2015-04-15 |
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