CN203687075U - Primary air system of coal mill of thermal power plant - Google Patents
Primary air system of coal mill of thermal power plant Download PDFInfo
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- CN203687075U CN203687075U CN201420060405.XU CN201420060405U CN203687075U CN 203687075 U CN203687075 U CN 203687075U CN 201420060405 U CN201420060405 U CN 201420060405U CN 203687075 U CN203687075 U CN 203687075U
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Abstract
The utility model discloses a primary air system of a coal mill of a thermal power plant and belongs to the technical field of thermal power plants. The system comprises an air pre-heater, a milling starting air heater and the coal mill, wherein the milling starting air heater is arranged on a bypass of a hot primary air pipeline of an outlet of the air pre-heater, a cold air pipeline communicated with an air inlet of the air pre-heater is communicated with a mixing pipeline of an inlet of the coal mill, an inlet of the mixing pipeline is further communicated with the hot primary air pipeline, and steam and condensate water which run alternately serve as the heat exchanging medium of the milling starting air heater. According to the system, by means of the optimal design of a milling starting air heating system, hot air entering the coal mill can be regulated more flexibly, the cold air mixing amount of the inlet of the coal mill is reduced, exhaust gas temperature is reduced, the efficiency of a boiler is improved, the condensate water is heated, and part of energy of hot primary air is recycled.
Description
Technical field
The utility model relates to thermal power plant technical field, particularly the primary air system of thermal power plant.
Background technology
Present stage, generates electricity by the hearth combustion coal dust at pulverized coal firing boiler in domestic thermal power plant.First thermal power plant wears into coal dust by coal pulverizer by raw coal, then by a wind, coal dust is sent into burner hearth and burns, and one time wind should meet the needed oxygen amount of coal dust firing, meets again the needs of pulverized coal conveying.
A tradition coal pulverizer required wind is that air enters air preheater heating after primary air fan pressurization, causes coal pulverizer heating coal dust from air preheater heat primary air out, sends into hearth combustion after reaching the condition that boiler needs.Because wind need to be used for dry coal dust, therefore wind needs the requirement of satisfied temperature and air quantity simultaneously, common practices is to draw the hot-flow flue of cold wind to coal pulverizer import from the primary air nozzle branch of air preheater import, is mixed for regulating temperature and the air quantity into the heat primary air of coal pulverizer with heat primary air.Because the thermal source of air preheater is from the hot flue gas of height of boiler, generally start can produce superheated steam time boiler operatiopn is stable, therefore boiler is in initial start process, air preheater is without thermal source, cannot heat cold air, now need employing to open mill wind heater and add heat primary air, open mill wind heater and take out the steam that draws adjacent unit as thermal source by auxiliary vapour header, after the wind-warm syndrome that heating cold wind to coal pulverizer needs, open again mill.Opening of traditional coal pulverizer primary air system ground wind heater only for using in the time opening mill, after boiler normally moves, do not re-use.
Because primary air system is subject to the restriction of coal pulverizer outlet temperature, require first cooling by wind wind must there is certain adjusting ratio, and along with reduction, the ature of coal variation etc. of load, sometimes need the cold wind ratio of mixing to alter a great deal, when as more in coal water content, abrasive dust built-in temperature reduces, when operation, required heat primary air strengthens, and heat primary air air door is opened completely, and a cold wind air door is in buttoned-up status; Otherwise, coal moisture content less, a cold wind air door is opened completely, heat primary air air door is closed completely, and now, the air capacity that the air preheater of flowing through, needs and high temperature flue-gas from boiler carry out heat exchange reduces, with high temperature flue-gas from boiler heat exchanger effectiveness reduce, affect the exhaust gas temperature of boiler.
The exchange capability of heat of air preheater is relevant to design capacity etc., and after unit operation, the principal element that affects air preheater exchange capability of heat and exhaust gas temperature is to send into the air capacity of air preheater and the ratio of exhaust gas volumn, i.e. wind and smoke ratio.The wind and smoke ratio of air preheater of flowing through is larger, and the caloric receptivity of cooling medium is larger, and the thermal discharge of heat release medium is larger; Vice versa.According to related data, the cold primary air flow of pulverized coal preparation system 10% finally can make exhaust gas temperature raise 7 DEG C; 40% cold primary air flow can make exhaust gas temperature raise nearly 30 DEG C, and therefore cold wind incorporation is the key factor that affects exhaust gas temperature present stage.
Utility model content
The utility model technical issues that need to address are to provide a kind of thermal power plant coal pulverizer primary air system, can rationally utilize open mill wind heater basis on, reduce the incorporation of first cooling by wind wind, solve the high problem of coal pulverizer import cold wind incorporation while use, further reduce exhaust gas temperature, improve boiler efficiency.
For solving the problems of the technologies described above, technical solution adopted in the utility model is as follows:
Thermal power plant coal pulverizer primary air system, comprise air preheater, open mill wind heater and coal pulverizer, the described mill wind heater that opens is arranged in the bypass of heat primary air pipeline of air preheater outlet, the cold air duct being communicated with air preheater air inlet is communicated with the mixing duct of coal pulverizer import by lateral, the import of mixing duct also with heat primary air pipeline communication; Described heat primary air is provided with electric adjustable section door on road, and the bypass of heat primary air pipeline is provided with electronic insertion plate door and electric adjustable section door, establishes electronic insertion plate door and electric adjustable section door on coal pulverizer import mixing duct, and electric adjustable section door is set on cold air duct;
The described heat transferring medium that opens mill wind heater is provided with steam and the condensate water of alternate run, and described steam heat-exchanging branch road comprises being communicated with to open the steam main of the import of mill wind heater and vapour source and be communicated with and opens the drain water piping that grinds wind heater outlet and drain tank; Described condensate water heat exchange branch road comprise be communicated with open the import of mill wind heater and boiler unit low add the inlet channel of entrance and be communicated with to open grind wind heater outlet and the low outlet conduit that adds outlet of boiler unit; On described steam main, inlet channel and outlet conduit, be respectively arranged with switch valve and flow control valve.
Owing to having adopted technique scheme, the technological progress that the utility model is obtained is as follows:
The utility model is by opening mill wind heating system optimal design, in the time that boiler brings into operation, open mill wind heater heating cold wind to the required temperature of coal pulverizer, unit replaces cold wind effect adjustment to arrive the wind-warm syndrome of coal pulverizer while normally operation, make the temperature of the heat primary air that enters coal pulverizer regulate more flexible, reduce the cold wind incorporation of coal pulverizer import, reduce exhaust gas temperature, improve boiler efficiency; Heat-setting water, reclaims heat primary air part heat.
The heat transferring medium that opens mill wind heater is provided with steam and the condensate water of alternate run, when boiler startup, open mill wind heater and take out by auxiliary vapour header the steam that draws adjacent unit and heat cold wind as thermal source, while normally operation, adopt condensate water to reduce the wind-warm syndrome by opening mill wind heater heat primary air.Wherein condensate water heat exchange branch road is on the steam heat-exchanging branch road basis extensively adopting, and increases and the inlet channel and the outlet conduit system that open mill wind heater and is connected, and this is simple in structure, easily realization; For changing open mill wind heater internal adjustment heat primary air temperature medium used as the condensate water that specific heat capacity is larger into, under equal quality condition, absorb more heat transfer, improve heat exchange efficiency.
Condensing water conduit is provided with flow control valve, controls the flow of condensate water in pipeline by flow control valve, and then controls the temperature of the heat primary air by opening mill wind heater, and this regulative mode is simple in structure, flexible adjustment.After the heat of condensed water absorption heat primary air, be back to boiler unit, reclaim the part heat in heat primary air, improve the heat utilization ratio of unit.
The utility model can reduce the heat primary air temperature that arrives coal pulverizer air inlet, the required cold blast rate of coal pulverizer air inlet is reduced, the lateral cold blast rate of cold air duct reduces, corresponding air preheater air inlet air quantity increases, in air preheater, carry out the cold wind air quantity increase of heat exchange with high temperature flue-gas from boiler, the high-temperature flue gas heat absorbing increases, and exhaust gas temperature is reduced, and has improved the heat exchange efficiency of boiler and air preheater.
In the time that ature of coal changes greatly, can be according to the concrete condition such as moisture, composition of ature of coal, regulate the condensing water flow of the Flux Valve Control pipeline of condensing water conduit, and then control arrives an air temperature of coal pulverizer air inlet, coordinate the electronic insertion plate door of air preheater primary air system and electric adjustable section door to control the air quantity of each passage simultaneously, and then control the air quantity and the temperature that arrive coal pulverizer inlet, reach dry coal dust, the object of sufficient oxygen is provided, thereby improve efficiency of fire coal.
The utility model all can adopt in different capacitance grade unit, invest less, be convenient to implement.
Brief description of the drawings
Fig. 1: structural representation of the present utility model.
Wherein: 1, cold air duct, 2, lateral, 3, heat primary air pipeline, 4, mixing duct, 5, air preheater, 6, open mill wind heater, 7, coal pulverizer, 8, inlet channel, 9, outlet conduit, 10, switch valve, 11, flow control valve, 12, steam main, 13 drain water pipings, 14, bypass duct, 15, electronic insertion plate door, 16, electric adjustable section door.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is done further to describe in detail:
Thermal power plant coal pulverizer primary air system, its structure as shown in Figure 1, comprise air preheater 5, open mill wind heater 6 and coal pulverizer 7, cold air arrives air preheater 5 air inlets by cold air duct 1 after primary air fan pressurization, cold air is heated as heat primary air through air preheater 5, heat primary air is discharged from air preheater 5 hot-blast outlets, the bypass duct 14 being communicated with through heat primary air pipeline 3 with heat primary air pipeline 3 arrives the air inlet that opens mill wind heater 6, heat primary air with open mill wind heater 6 interior medias and carry out heat exchange, heat primary air through heat exchange action is discharged from the air outlet that opens mill wind heater 6, send into coal pulverizer.
The utility model is provided with lateral 2 with the cold air duct 1 that air preheater 5 air inlets are communicated with, and cold air duct 1 is communicated with mixing duct 4 by lateral 2; From opening the heat primary air of mill wind heater 6 air outlets discharges and mixing at mixing duct 4 by the cold wind of lateral 2, enter coal pulverizer 7 through the air inlet of coal pulverizer 7 afterwards.On heat primary air pipeline 3, be provided with electric adjustable section door 16, the bypass duct 14 of heat primary air pipeline 3 is provided with electronic insertion plate door 15 and electric adjustable section door 16, on coal pulverizer 7 import mixing ducts 4, establish electronic insertion plate door 15 and electric adjustable section door 16, electric adjustable section door 16 is set on cold air duct 1, electronic insertion plate door 15 is used for the break-make of control channel, and electric adjustable section door 16 is used for controlling by the air force of pipeline.
Open on the bypass duct 14 that mill wind heater 6 is arranged in the heat primary air pipeline 3 that air preheater 5 exports, open mill wind heater 6 air inlets and air outlet and be communicated with heat primary air pipeline 3 respectively, bypass duct 14 is provided with electronic insertion plate door 15 and electric adjustable section door 16 and controls and the break-make of heat primary air pipeline 3.The heat transferring medium that opens mill wind heater 6 is provided with steam and the condensate water of alternate run, comprises steam heat-exchanging branch road and condensate water heat exchange branch road.Steam heat-exchanging branch road comprises steam main 12 and drain water piping 13, and steam main 12 is used for being communicated with and opens mill wind heater 6 imports and vapour source, and drain water piping 13 connections are opened mill wind heater 6 and exported and drain tank; Condensate water heat exchange branch road comprises inlet channel 8 and outlet conduit 9, and mill wind heater 6 imports and a certain low entrance that adds of boiler unit are opened in inlet channel 8 connections, and 6 outlet and a certain low outlets that add of boiler unit of mill wind heater are opened in outlet conduit 9 connections.
When boiler brings into operation, open mill wind heater 6 and take out the steam that draws adjacent unit as thermal source by auxiliary vapour header, steam is arrived and is opened 6 imports of mill wind heater by steam main 12, steam enters and opens mill wind heater 6 and heat the cold air of flowing through wherein, cold air reaches after the wind-warm syndrome of coal pulverizer 7 needs, enters coal pulverizer 7 and opens mill.The condensed water producing in steam heat-exchanging process arrives drain tank through opening 6 outlets of mill wind heater and drain water piping 13.
When unit normally moves, the hot smoke gas flow of height of boiler is through air preheater 5, the cold air that heating enters air preheater 5 from cold air duct 1 forms heat primary air, for the heat exchange efficiency that makes air preheater 5 improves as far as possible, exhaust gas temperature reduces as far as possible, the primary air flow that need to heat by air preheater 5 increases, and now can control air force by the electric adjustable section door 16 arranging on pipeline.Cold air is heated as heat primary air through air preheater 5, opens mill wind heater 6 afterwards through heat primary air pipeline 3 and bypass duct 14 arrival, and mill wind heater 6 ducted condensate water are opened in heating.Condensate water arrives the import of opening mill wind heater 6 from a certain low entrance that adds of boiler unit through inlet channel 8, enter and open the condensate water of mill wind heater 6 and carry out heat exchange from opening the heat primary air that mill wind heater 6 air inlets enter, the heat of condensed water absorption heat primary air, condensate water flows out from opening 6 outlets of mill wind heater afterwards, arrive a certain low outlet that adds of boiler unit through outlet conduit 9, reclaim part heat in heat primary air.On described steam main 12, inlet channel 8 and outlet conduit 9, be respectively arranged with switch valve 10 and flow control valve 11, in order to regulate the condensate water water yield of pipeline, and then control the temperature by opening the heat primary air that grinds wind heater 6.
Heat primary air after air preheater 5 heating temperature after opening mill wind heater 6 reduces, and now opens mill wind heater 6 and replaces cold wind effect to adjust heat primary air temperature.The heat primary air that reduces temperature arrives mixing duct 4 through opening mill wind heater 6 air outlets, mixes at mixing duct 4 with the cold wind through lateral 2, enters afterwards coal pulverizer 7.Because the temperature of the heat primary air that now arrives coal pulverizer 7 entrances reduces, meet coal pulverizer 7 inlet temperatures and require to need the cold blast rate mixing to reduce, the adjusting ratio of cold wind is greatly reduced, be equivalent to increase the adjusting ratio of cold wind.Corresponding air preheater 5 air inlets increase for the heat primary air Zhi Fengliang heating, the cold blast rate that carries out heat exchange with the high hot flue gas of boiler increases, the high hot flue gas heat of boiler absorbing increases, and has reduced exhaust gas temperature, has improved boiler exhaust gas and air preheater heat exchange efficiency.Heat primary air pipeline 3 is communicated with hybrid channel 4 simultaneously, in heat primary air pipeline 3, be provided with electric control valve 16, be used for controlling the heat primary air air quantity that arrives mixing duct 4, too low in order to prevent the temperature of the heat primary air by opening mill wind heater 6, do not reach the temperature requirement of coal pulverizer 7 coal feed points.
When unit operation, make the temperature of the heat primary air that enters pulverized coal preparation system identical with the temperature and the air quantity that mix wind in original system with air quantity by reducing heat primary air temperature with the mode that regulates heat primary air air quantity, thereby under the prerequisite that does not change pulverized coal preparation system operation conditions, effectively reduced the cold blast rate that pulverized coal preparation system mixes.
Opening in the utility model ground wind heater, in the time of boiler startup, opening mill as routine uses, when normally moving, unit uses as adjusting heat primary air wind-warm syndrome, on original basis, increase and grind inlet channel and outlet conduit system and the pipeline flow control valve that wind heater is connected with opening, to open mill wind heater and be connected in the bypass of former air preheater heat primary air pipeline, and volume damper is set on pipeline, this is simple in structure, be convenient to implement, different capacitance grade unit all can be applied.
Claims (1)
1. thermal power plant coal pulverizer primary air system, comprise air preheater (5), open mill wind heater (6) and coal pulverizer (7), it is characterized in that: described in open mill wind heater (6) and be arranged in the bypass of heat primary air pipeline (3) of air preheater (5) outlet, the cold air duct (1) being communicated with air preheater (5) air inlet is communicated with the mixing duct (4) of coal pulverizer (7) import by lateral (2), the import of mixing duct (4) is also communicated with heat primary air pipeline (3), on described heat primary air pipeline (3), be provided with electric adjustable section door (16), the bypass of heat primary air pipeline (3) is provided with electronic insertion plate door (15) and electric adjustable section door (16), on coal pulverizer (7) import mixing duct (4), establish electronic insertion plate door (15) and electric adjustable section door (16), electric adjustable section door (16) is set on cold air duct (1),
The described heat transferring medium that opens mill wind heater (6) is provided with steam and the condensate water of alternate run, and described steam heat-exchanging branch road comprises being communicated with to open the steam main (12) of the import of mill wind heater (6) and vapour source and is communicated with and opens that mill wind heater (6) exports and the drain water piping (13) of drain tank; Described condensate water heat exchange branch road comprise be communicated with open mill wind heater (6) import and boiler unit low add the inlet channel (8) of entrance and be communicated with open mill wind heater (6) and export and the low outlet conduit (9) that adds outlet of boiler unit; On described steam main (12), inlet channel (8) and outlet conduit (9), be respectively arranged with switch valve (10) and flow control valve (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420060405.XU CN203687075U (en) | 2014-02-10 | 2014-02-10 | Primary air system of coal mill of thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420060405.XU CN203687075U (en) | 2014-02-10 | 2014-02-10 | Primary air system of coal mill of thermal power plant |
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| CN203687075U true CN203687075U (en) | 2014-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420060405.XU Expired - Lifetime CN203687075U (en) | 2014-02-10 | 2014-02-10 | Primary air system of coal mill of thermal power plant |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104976637A (en) * | 2015-05-22 | 2015-10-14 | 华电国际电力股份有限公司技术服务中心 | Method for calculating cold air leakage amount of inlet of coal mill for thermal power generation boiler |
| CN107159431A (en) * | 2017-05-31 | 2017-09-15 | 大唐贵州发耳发电有限公司 | A kind of coal pulverizer primary wind heating system and its operation method |
| CN113154431A (en) * | 2021-04-12 | 2021-07-23 | 武汉钢电股份有限公司 | Powder preparation system and method for high-proportion mixed-burning bituminous coal of steel ball coal mill |
| CN113513652A (en) * | 2021-04-14 | 2021-10-19 | 西安热工研究院有限公司 | Industrial basket type pipeline heating device and heating method thereof |
| CN115930253A (en) * | 2022-12-06 | 2023-04-07 | 青岛达能环保设备股份有限公司 | Coal Mill Inlet Primary Air Air Temperature Regulating System |
-
2014
- 2014-02-10 CN CN201420060405.XU patent/CN203687075U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104976637A (en) * | 2015-05-22 | 2015-10-14 | 华电国际电力股份有限公司技术服务中心 | Method for calculating cold air leakage amount of inlet of coal mill for thermal power generation boiler |
| CN104976637B (en) * | 2015-05-22 | 2017-04-12 | 华电国际电力股份有限公司技术服务中心 | Method for calculating cold air leakage amount of inlet of coal mill for thermal power generation boiler |
| CN107159431A (en) * | 2017-05-31 | 2017-09-15 | 大唐贵州发耳发电有限公司 | A kind of coal pulverizer primary wind heating system and its operation method |
| CN113154431A (en) * | 2021-04-12 | 2021-07-23 | 武汉钢电股份有限公司 | Powder preparation system and method for high-proportion mixed-burning bituminous coal of steel ball coal mill |
| CN113513652A (en) * | 2021-04-14 | 2021-10-19 | 西安热工研究院有限公司 | Industrial basket type pipeline heating device and heating method thereof |
| CN115930253A (en) * | 2022-12-06 | 2023-04-07 | 青岛达能环保设备股份有限公司 | Coal Mill Inlet Primary Air Air Temperature Regulating System |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 050031 No. 6 Jianbei Street, Chang'an District, Shijiazhuang City, Hebei Province Patentee after: POWERCHINA HEBEI ELECTRIC POWER ENGINEERING Co.,Ltd. Address before: 050031 No. 6 Jianbei Street, Chang'an District, Shijiazhuang City, Hebei Province Patentee before: HEBEI ELECTRIC POWER DESIGN & Research Institute |
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| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140702 |
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| CX01 | Expiry of patent term |