CN105135454A - Method of supercritical once-through boiler for achieving stable-pressure pipe blowing in wet state - Google Patents
Method of supercritical once-through boiler for achieving stable-pressure pipe blowing in wet state Download PDFInfo
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- CN105135454A CN105135454A CN201510528254.5A CN201510528254A CN105135454A CN 105135454 A CN105135454 A CN 105135454A CN 201510528254 A CN201510528254 A CN 201510528254A CN 105135454 A CN105135454 A CN 105135454A
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Abstract
The invention discloses a method of a supercritical once-through boiler for achieving stable-pressure pipe blowing in a wet state. The method comprises the steps that 1, a temporary system pipeline is set up; 2, powder feeding and pipe blowing are carried out on the supercritical once-through boiler; 3, the fineness of coal powder is adjusted, and the fineness R90 of the coal powder is smaller than 5%; and 4, a boiler desuperheating water system, a smoke baffle and the total air volume are adjusted so that the steam temperature of a high-temperature superheater outlet can be smaller than or equal to 427 DEG C, the steam temperature of a high-temperature reheater outlet can be smaller than or equal to 460 DEG C, and the supercritical once-through boiler can achieve stable-pressure pipe blowing in the wet state. The technical problems that in the prior art, the procedure of stable-pressure pipe blowing of the supercritical once-through boiler in a dry state is complex, pipe blowing time is long, the dry state and the wet state need to be switched, the safety risk of a water cooling wall is large, and a temporary system is high in cost are solved.
Description
Technical field
The invention belongs to thermal power plant's supercritical once-through boiler blowpipe technology, particularly relate to a kind of method that supercritical once-through boiler realizes image-stabilization FCS under hygrometric state.
Background technology
Supercritical once-through boiler blowpipe is the important ring in thermal power plant's capital construction process, and the quality of blowpipe quality directly has influence on the safe operation of unit particularly steam turbine.
At present, supercritical once-through boiler image-stabilization FCS technology be all direct current cooker become a cadre state operating mode under carry out, at the end of an image-stabilization FCS boiler must blowing out cooling, make the oxide skin on heating surface be convenient to come off by expanding with heat and contract with cold, therefore, dry state blowpipe terminates rear boiler and must go back to hygrometric state.Boiler water coal controls not throw during blowpipe than automatically, needs manual adjustment, for ensureing that main steam temperature is no more than 427 DEG C, must adopt the micro-overheated strategy of separator.Overheating steam temperature is mainly through water coal than adjustment, and desuperheating water is as fine setting.Under running on the lower load, water-cooling wall hydrodynamic regime is in bad working environments, meanwhile, very easily causes boiler to change back and forth between dry hygrometric state, considerably increase water-cooling wall security risk during manual adjustment.In addition, even if super-heated steam temperature control is within 427 DEG C, because in stove, thermic load generally reaches more than 50%BMCR, reheat steam temperature is greater than 500 DEG C, interim gland steam exhauster material needs use 12Cr1MoVG or install interim desuperheating water additional, considerably increases the cost of temporary system pipeline.
Summary of the invention
The technical problem to be solved in the present invention: provide a kind of supercritical once-through boiler to realize the method for image-stabilization FCS under hygrometric state, longly need dry hygrometric state change to solve in prior art the image-stabilization FCS complex procedures blowpipe time under supercritical once-through boiler dry state, water-cooling wall security risk greatly, temporary system piping cost high-technology problem.
Technical solution of the present invention:
Supercritical once-through boiler realizes a method for image-stabilization FCS under hygrometric state, and it comprises:
Step 1, build temporary system pipeline;
Step 2, throwing powder blowpipe is carried out to supercritical once-through boiler;
Step 3, adjustment fineness of pulverized coal, fineness of pulverized coal R90 < 5%;
Step 4, adjustment boiler Attemperation water system, gas baffle and total blast volume realize high temperature superheater outlet steam temperature≤427 DEG C, high temperature reheater outlet steam temperature≤460 DEG C, and supercritical once-through boiler realizes image-stabilization FCS under hygrometric state
Build temporary system pipeline described in step 1, it faces controls temporary pipeline in front of the door and adopts seamless steel pipe, and specification is: Φ 426x22, and material is: 15CrMoG; Face and control temporary pipeline employing seamless steel pipe behind the door, specification is: Φ 510x25, and material is: 15CrMoG; Middle temporary pipeline behind the door adopts seamless steel pipe, and specification is: Φ 720x20, and material is: 20G; Interim blow-off line adopts seamless steel pipe or welded still pipe, and specification is: Φ 1020x20, and material is: 20G.
Adjusting fineness of pulverized coal method described in step 3 is: adjustment low speed coal mill initial steel ball ratio is: Φ 30 and Φ 40 steel ball weight account for more than 70% of total steel ball loading capacity.
Beneficial effect of the present invention:
The present invention adopts the method increasing temporary system pipe diameter to increase by vapor (steam) velocity in purging system; Adopt the method improving low speed coal mill minor diameter steel ball ratio to ensure the fineness of as-fired coal powder, so that coal dust burns in time, improved, reheater vapor (steam) temperature, thus improve by steam flow rate in purging system, strengthen steam blowing momentum; Realize supercritical once-through boiler image-stabilization FCS under hygrometric state.
Compared with prior art, the present invention is on the temporary system basis of conventional buck blowpipe, suitable increasing temporary system caliber and small ball ratio in increase low speed coal mill, temporary system material rate need not be improved or increase interim Attemperation water system, supercritical once-through boiler image-stabilization FCS under hygrometric state can be realized, reduce temporary system cost, avoid the security risk of water-cooling wall during image-stabilization FCS under dry state.
After adopting the present invention, during boiler image-stabilization FCS, temporary system does not need increase interim Attemperation water system or promote temporary pipeline material, reduces the cost of temporary system; Low speed coal mill grinds thinner coal dust, ensure that catching fire in time and burning of coal dust, adopts that formal mistake, reheater Attemperation water system and the gas baffle of boiler just can effectively control, reheat steam temperature; Supercritical once-through boiler water-cooling wall runs always under hygrometric state, not be used between dry, hygrometric state and frequently switches, ensure that the safety that water-cooling wall runs.The present invention has the value using and promote very much; The image-stabilization FCS complex procedures blowpipe time under supercritical once-through boiler dry state that to solve in prior art is long needs dry hygrometric state change, water-cooling wall security risk greatly, temporary system high in cost of production technical problem.
Detailed description of the invention
Supercritical once-through boiler realizes a method for image-stabilization FCS under hygrometric state, and it comprises:
Step 1, build temporary system pipeline, temporary system pipeline path is the same with prior art, and distinctive points is that it faces and controls temporary pipeline in front of the door and adopt seamless steel pipe, and specification is: Φ 426x22, and material is: 15CrMoG; Face and control temporary pipeline employing seamless steel pipe behind the door, specification is: Φ 510x25, and material is: 15CrMoG; Middle temporary pipeline behind the door adopts seamless steel pipe, and specification is: Φ 720x20, and material is: 20G; Interim blow-off line adopts seamless steel pipe or welded still pipe, and specification is: Φ 1020x20, and material is: 20G.The temporary system pipeline that the present invention adopts can reduce vapor flow resistance in temporary system, improves the speed of vapor flow, increases the momentum of steam purge system, and reduces the high problem of prior art temporary system piping cost.
Step 2, throwing powder blowpipe is carried out to supercritical once-through boiler; To improve superheated steam, reheat steam temperature, increase steam specific volume, improve by vapor flow speed in purging system, improve and purge momentum, reduce fuel consumption simultaneously.
Step 3, adjustment fineness of pulverized coal, adjusting fineness of pulverized coal method described in step 3 is: adjustment low speed coal mill initial steel ball ratio is: Φ 30 and Φ 40 steel ball weight account for more than 70% of total steel ball loading capacity, guarantee fineness of pulverized coal R90 < 5%, fineness of pulverized coal R90 < 5%; Ensure that coal dust catches fire in time and burns, guaranteed that reheater temperature controlled in claimed range.
Step 4, adjustment boiler Attemperation water system, gas baffle and total blast volume realize high temperature superheater outlet steam temperature≤427 DEG C, high temperature reheater outlet steam temperature≤460 DEG C, can realize supercritical once-through boiler on this basis and realize image-stabilization FCS under hygrometric state.
The present invention adopts the method increasing temporary system pipe diameter to increase by vapor (steam) velocity in purging system; The method improving low speed coal mill minor diameter steel ball ratio is adopted to ensure the timely burning of as-fired coal powder, to improve, reheater vapor (steam) temperature, thus improve by steam flow rate, increasing steam blowing momentum in purging system, realize supercritical once-through boiler image-stabilization FCS under hygrometric state.
Claims (3)
1. supercritical once-through boiler realizes a method for image-stabilization FCS under hygrometric state, it is characterized in that: it comprises:
Step 1, build temporary system pipeline;
Step 2, throwing powder blowpipe is carried out to supercritical once-through boiler;
Step 3, adjustment fineness of pulverized coal, fineness of pulverized coal R90 < 5%;
Step 4, adjustment boiler Attemperation water system, gas baffle and total blast volume realize high temperature superheater outlet steam temperature≤427 DEG C, high temperature reheater outlet steam temperature≤460 DEG C, realize image-stabilization FCS to realize supercritical once-through boiler under hygrometric state.
2. a kind of supercritical once-through boiler according to claim 1 realizes the method for image-stabilization FCS under hygrometric state, it is characterized in that: described in step 1, build temporary system pipeline, it faces controls temporary pipeline employing seamless steel pipe in front of the door, and specification is: Φ 426x22, and material is: 15CrMoG; Face and control temporary pipeline employing seamless steel pipe behind the door, specification is: Φ 510x25, and material is: 15CrMoG; Middle temporary pipeline behind the door adopts seamless steel pipe, and specification is: Φ 720x20, and material is: 20G; Interim blow-off line adopts seamless steel pipe or welded still pipe, and specification is: Φ 1020x20, and material is: 20G.
3. a kind of supercritical once-through boiler according to claim 1 realizes the method for image-stabilization FCS under hygrometric state, it is characterized in that: adjusting fineness of pulverized coal method described in step 3 is: adjustment low speed coal mill initial steel ball ratio is: Φ 30 and Φ 40 steel ball weight account for more than 70% of total steel ball loading capacity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510528254.5A CN105135454A (en) | 2015-08-26 | 2015-08-26 | Method of supercritical once-through boiler for achieving stable-pressure pipe blowing in wet state |
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| CN201510528254.5A CN105135454A (en) | 2015-08-26 | 2015-08-26 | Method of supercritical once-through boiler for achieving stable-pressure pipe blowing in wet state |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108954283A (en) * | 2018-06-26 | 2018-12-07 | 国网浙江省电力有限公司电力科学研究院 | Overcritical or extra-supercritical unit hygrometric state become a cadre state process automatic control method |
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2015
- 2015-08-26 CN CN201510528254.5A patent/CN105135454A/en active Pending
Non-Patent Citations (5)
| Title |
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| 夏永俊: "660MW超_超_临界机组直流锅炉吹管技术", 《中国电力》 * |
| 李永生: "锅炉吹管方式的选择及应注意的问题", 《中国电力》 * |
| 王伟等: "600MW超临界W型火焰无烟煤锅炉调试技术与实践", 《锅炉技术》 * |
| 赵志军等: "超临界直流锅炉吹管工艺优化及控制", 《贵州电力技术》 * |
| 黄伟: "新的吹管方式在600MW超临界锅炉上的应用", 《华中电力》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108954283A (en) * | 2018-06-26 | 2018-12-07 | 国网浙江省电力有限公司电力科学研究院 | Overcritical or extra-supercritical unit hygrometric state become a cadre state process automatic control method |
| CN108954283B (en) * | 2018-06-26 | 2019-10-29 | 国网浙江省电力有限公司电力科学研究院 | Overcritical or extra-supercritical unit hygrometric state become a cadre state process automatic control method |
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Application publication date: 20151209 |