CN105402714A - Pump-free starting system of supercritical once-through boiler and starting method - Google Patents
Pump-free starting system of supercritical once-through boiler and starting method Download PDFInfo
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- CN105402714A CN105402714A CN201510974952.8A CN201510974952A CN105402714A CN 105402714 A CN105402714 A CN 105402714A CN 201510974952 A CN201510974952 A CN 201510974952A CN 105402714 A CN105402714 A CN 105402714A
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- boiler
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- superheater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention relates to a pump-free starting system of supercritical once-through boiler and a starting method. Several different starting system design schemes are provided for power station boilers and are relatively varied and are not standard. The pump-free starting system comprises a water feeding device (1), wherein the water feeding device is connected to a coal economizer (2) by a pipeline; the coal economizer is connected to a water cooling wall by a pipeline and is connected to a drain flash tank (5) by an overflow pipe heating pipeline (4); the water cooling wall is connected to a starting separator (6) by a pipeline; the starting separator is connected to a superheater (7) and a water storage tank (8); the water storage tank is connected to the drain flash tank and a superheater two-stage desuperheating water bypass (10) by an overflow pipe (9); and the drain flash tank is connected to a drain tank (12) by a pressure balance pipeline (11). The pump-free starting system is used for pump-free starting of the boiler.
Description
technical field:
the present invention relates to a kind of supercritical once-through boiler and be not with pump startup system and starting method.
background technology:
the start up system that the direct current cooker of the existing different capabilities of current station boiler adopts is arranged all not identical, there is the conceptual design of several different start up system, relatively more assorted, inadequate specification.What direct current cooker adopted has that pump startup system investments is large, operation is complicated, the operation and maintenance of rotatable parts requires that the control overflow of height, circulating pump is high, require higher to operations staff and mode, the startup circulating pump of substantially all engineerings adopts imported product, as there is circulating pump fault, member replacing somewhat expensive, machinery check and repair needs to return genuine to carry out, run and the cost of overhaul too high, practicality is not high.
summary of the invention:
the object of this invention is to provide a kind of supercritical once-through boiler and be not with pump startup system and starting method.
above-mentioned object is realized by following technical scheme:
a kind of supercritical once-through boiler is not with pump startup system, its composition comprises: waterworks, described waterworks are connected with economizer by pipeline, described economizer is connected with water-cooling wall by pipeline, described economizer is connected with hydrophobic development unit by overflow pipe heating coil pipeline, described water-cooling wall is connected with startup separator by pipeline, described startup separator respectively with superheater, water storage tank connects, described water storage tank by overflow pipe respectively with described hydrophobic development unit, the bypass of superheater secondary desuperheating water connects, described hydrophobic development unit is connected with drain tank by pressure balance pipeline.
described supercritical once-through boiler is not with pump startup system, and described overflow pipe is provided with overflow valve.
utilize the starting method of described supercritical once-through boiler not with pump startup system, the method comprises the steps:
water enters from economizer entrance header, through economizer, burner hearth to startup separator, after described startup is separated, the water separated enters hydrophobic development unit by the water storage tank of separator bottom via described water storage tank hydrophobic pipeline, the steam separated through described startup separator enters roof enclosure wall system, flow through primary superheater, secondary division pendant superheater and finishing superheater successively, drawn by live steam piping; When unit load reaches more than minimal once-through circulation load (30%B-MCR load), boiler proceeds to DC operation mode, and start up system is out of service proceeds to hot stand-by duty;
when feed water quality meets the demands, just can by boiler feed pump to boiler water filling, vent valve on economizer described during this period will be opened, so that the air in the economizer described in getting rid of, after in described economizer, air is got rid of, vent valve described in closedown, simultaneously by described water storage tank hydrophobic to described hydrophobic development unit to maintain the liquid level in water storage tank, when all interlock protections are ready, boiler just can be lighted a fire, before enough steam flows set up by described superheater and reheater, the injected volume of fuel must control, and guarantee the flue-gas temperature before final reheater not higher than 538 DEG C, when the flow in described superheater and described reheater is approximately 15% of maximum stream flow, attemperator is put into operation and controls vapor (steam) temperature,
with the increase of steam flow, great load is to maintain the needs of boiler load increase gradually for feed pump, and when the steam pressure before steam turbine stop valve and temperature reach the minimum needed for steam turbine red switch, steam turbine carries out red switch.
beneficial effect of the present invention:
1. the present invention is applicable to boiler not tape starting circulating pump startup, and system is simple, small investment; Operation is convenient; Easy realization controls automatically: maintenance load is few, to operations staff and mode less demanding, there is good economy, adaptability and market potential, practical, there is good development prospect.
the present invention's one is used for supercritical once-through boiler and is not with pump startup system and starting method, can under the condition being not activated circulating pump, ensure that larger burner hearth feedwater flow, be conducive to ensureing enough coolings of water-cooling wall and hydrodynamic stability, and then guarantee water-cooling wall safety assurance boiler start-up system safe and stable operation, realize boiler without pump operation.
, the present invention can not be connected with steam turbine side system, system is relatively independent, and not by the restriction of steam turbine selection and operation, the method for operation is relatively flexible.
, the present invention be convenient to boiler cold and hot state rinse; Water-cooling wall flow can be increased by improving pump flow when cold and hot state is rinsed, thus improve the developing result of boiler, shorten washing time, the amount of conserving water.
accompanying drawing illustrates:
accompanying drawing 1 is structural representation of the present invention.
detailed description of the invention:
embodiment 1:
a kind of supercritical once-through boiler is not with pump startup system, its composition comprises: waterworks 1, described waterworks are connected with economizer 2 by pipeline, described economizer is connected with water-cooling wall 3 by pipeline, described economizer is connected with hydrophobic development unit 5 by overflow pipe heating coil pipeline 4, described water-cooling wall is connected with startup separator 6 by pipeline, described startup separator respectively with superheater 7, water storage tank 8 connects, described water storage tank by overflow pipe 9 respectively with described hydrophobic development unit, superheater secondary desuperheating water bypass 10 connects, described hydrophobic development unit is connected with drain tank 12 by pressure balance pipeline 11.
embodiment 2:
supercritical once-through boiler according to embodiment 1 is not with pump startup system, described overflow pipe is provided with overflow valve 13.
embodiment 3:
supercritical once-through boiler according to embodiment 1 or 2 is not with pump startup system, and described supercritical once-through boiler is not with pump startup system to have following functions:
1) cold conditions of the feed water system of boiler, water-cooling wall and economizer and warm state water rinse, and flushing water is entered cooling water house steward or condenser by flash vessel and drain tank.
) meet the needs of boiler cold-state, warm state, hot and very hot startup, until boiler reaches 30%BMCR minimal once-through circulation load, run by hygrometric state and proceed to till dry state runs.
) as long as water quality is qualified, start up system can recovery section working medium and contained heat thereof completely.
) boiler is when proceeding to DC operation, start up system is in hot stand-by duty, once the carbonated drink phase of expansion between the starting period tided over by boiler, namely stove water recycle is carried out by feed pump, run below minimal once-through circulation load, when water level appears in water storage tank, according to the automatic regulation relief valve aperture of the height of water level, carry out stove water recycle.
) start separator system can play water-cooling wall outlet with superheater between temperature compensation function, uniform distribution enters the steam flow of superheater.
embodiment 4:
supercritical once-through boiler according to embodiment 1 or 2 is not with pump startup system, described water storage tank is parallel with separator, be arranged in parallel, described water storage tank and described separator outlet pipe all provide certain effective reservoir volume, the volume of described water storage tank is reduced relatively, because water storage tank and separator may be unbalanced and cause respective water-level fluctuation because of mutual pressure, therefore draw pressure-equalizing pipe on water storage tank top and be connected to keep pressure balance with separator.
embodiment 5:
supercritical once-through boiler according to embodiment 1 or 2 is not with pump startup system, the stoppage in transit of described boiler controller system and to start be two contrary processes, in furnace shutting down process, constantly reduce at the load of the above boiler of dc point and steam turbine, working medium flow in the following furnace wall cooling of dc point should remain constant, along with the continuous decrease of combustion rate and load, water will be had in steam-water separator to be separated, after the water level in water storage tank reach a certain height, drain valve is opened, and start drainage pump, reduce further with load, increasing water is separated from separator, now should slowly reduce exerting oneself of feed pump, increase hydrophobic amount simultaneously, to reach the requirement maintaining minimum working medium flow in boiler furnace water-cooling wall, and keep the height of liquid level in water storage tank, when steam turbine reaches minimum load, boiler and steam turbine can be stopped transport.
embodiment 6:
utilize the starting method of supercritical once-through boiler not with pump startup system described in claim 1 or 2, the method comprises the steps:
water enters from economizer entrance header, through economizer, burner hearth to startup separator, after described startup is separated, the water separated enters hydrophobic development unit by the water storage tank of separator bottom via described water storage tank hydrophobic pipeline, the steam separated through described startup separator enters roof enclosure wall system, flow through primary superheater, secondary division pendant superheater and finishing superheater successively, drawn by live steam piping; When unit load reaches more than minimal once-through circulation load (30%B-MCR load), boiler proceeds to DC operation mode, and start up system is out of service proceeds to hot stand-by duty;
when feed water quality meets the demands, just can by boiler feed pump to boiler water filling, vent valve on economizer described during this period will be opened, so that the air in the economizer described in getting rid of, after in described economizer, air is got rid of, vent valve described in closedown, simultaneously by described water storage tank hydrophobic to described hydrophobic development unit to maintain the liquid level in water storage tank, when all interlock protections are ready, boiler just can be lighted a fire, before enough steam flows set up by described superheater and reheater, the injected volume of fuel must control, and guarantee the flue-gas temperature before final reheater not higher than 538 DEG C, when the flow in described superheater and described reheater is approximately 15% of maximum stream flow, attemperator is put into operation and controls vapor (steam) temperature,
with the increase of steam flow, great load is to maintain the needs of boiler load increase gradually for feed pump, and when the steam pressure before steam turbine stop valve and temperature reach the minimum needed for steam turbine red switch, steam turbine carries out red switch.
Claims (3)
1. a supercritical once-through boiler is not with pump startup system, its composition comprises: waterworks, it is characterized in that: described waterworks are connected with economizer by pipeline, described economizer is connected with water-cooling wall by pipeline, described economizer is connected with hydrophobic development unit by overflow pipe heating coil pipeline, described water-cooling wall is connected with startup separator by pipeline, described startup separator respectively with superheater, water storage tank connects, described water storage tank by overflow pipe respectively with described hydrophobic development unit, the bypass of superheater secondary desuperheating water connects, described hydrophobic development unit is connected with drain tank by pressure balance pipeline.
2. supercritical once-through boiler according to claim 1 is not with pump startup system, it is characterized in that: described overflow pipe is provided with overflow valve.
3. utilize the starting method of supercritical once-through boiler not with pump startup system described in claim 1, it is characterized in that: the method comprises the steps:
Water enters from economizer entrance header, through economizer, burner hearth to startup separator, after described startup is separated, the water separated enters the water storage tank of separator bottom, hydrophobic development unit is entered via described water storage tank hydrophobic pipeline, the steam separated through described startup separator enters roof enclosure wall system, flows through primary superheater, secondary division pendant superheater and finishing superheater successively, is drawn by live steam piping; When unit load reaches more than minimal once-through circulation load (30%B-MCR load), boiler proceeds to DC operation mode, and start up system is out of service proceeds to hot stand-by duty;
When feed water quality meets the demands, just can by boiler feed pump to boiler water filling, vent valve on economizer described during this period will be opened, so that the air in the economizer described in getting rid of, after in described economizer, air is got rid of, vent valve described in closedown, simultaneously by described water storage tank hydrophobic to described hydrophobic development unit to maintain the liquid level in water storage tank, when all interlock protections are ready, boiler just can be lighted a fire, before enough steam flows set up by described superheater and reheater, the injected volume of fuel must control, guarantee the flue-gas temperature before final reheater not higher than 538 DEG C, when the flow in described superheater and described reheater is approximately 15% of maximum stream flow, attemperator is put into operation and controls vapor (steam) temperature,
Increase with steam flow, great load is to maintain the needs of boiler load increase gradually for feed pump, and when the steam pressure before steam turbine stop valve and temperature reach the minimum needed for steam turbine red switch, steam turbine carries out red switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510974952.8A CN105402714A (en) | 2015-12-23 | 2015-12-23 | Pump-free starting system of supercritical once-through boiler and starting method |
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| CN201510974952.8A CN105402714A (en) | 2015-12-23 | 2015-12-23 | Pump-free starting system of supercritical once-through boiler and starting method |
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| CN105402714A true CN105402714A (en) | 2016-03-16 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106765028A (en) * | 2017-01-22 | 2017-05-31 | 华北电力科学研究院有限责任公司 | A kind of power plant boiler starts boiler circuit and its start-up and shut-down control method |
| CN109695867A (en) * | 2018-12-26 | 2019-04-30 | 华电电力科学研究院有限公司 | A kind of application starting circulating pump realizes the system and working method of economizer hot water re-circulation |
| CN111379603A (en) * | 2020-04-07 | 2020-07-07 | 山东华电节能技术有限公司 | Low-pressure cylinder zero-power unit heating pipe bypass system and working method thereof |
| CN112303610A (en) * | 2020-10-30 | 2021-02-02 | 西安热工研究院有限公司 | Operation system and method for recovering high-energy water in shutdown and non-shutdown operation mode |
| CN113446649A (en) * | 2021-07-30 | 2021-09-28 | 西安热工研究院有限公司 | Logic control system and method for high-energy water inlet regulating valve in double control modes |
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| CN205208528U (en) * | 2015-12-23 | 2016-05-04 | 哈尔滨锅炉厂有限责任公司 | Overcritical once -through boiler does not take pump start -up system |
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| JPS54125304A (en) * | 1978-03-24 | 1979-09-28 | Mitsubishi Heavy Ind Ltd | Boiler equipped with canned-water circulation pump |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106765028A (en) * | 2017-01-22 | 2017-05-31 | 华北电力科学研究院有限责任公司 | A kind of power plant boiler starts boiler circuit and its start-up and shut-down control method |
| CN109695867A (en) * | 2018-12-26 | 2019-04-30 | 华电电力科学研究院有限公司 | A kind of application starting circulating pump realizes the system and working method of economizer hot water re-circulation |
| CN111379603A (en) * | 2020-04-07 | 2020-07-07 | 山东华电节能技术有限公司 | Low-pressure cylinder zero-power unit heating pipe bypass system and working method thereof |
| CN112303610A (en) * | 2020-10-30 | 2021-02-02 | 西安热工研究院有限公司 | Operation system and method for recovering high-energy water in shutdown and non-shutdown operation mode |
| CN113446649A (en) * | 2021-07-30 | 2021-09-28 | 西安热工研究院有限公司 | Logic control system and method for high-energy water inlet regulating valve in double control modes |
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Application publication date: 20160316 |
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