CN103912886A - Intermittent supercritical unit stabilized-pressure pipe blowing method - Google Patents
Intermittent supercritical unit stabilized-pressure pipe blowing method Download PDFInfo
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- CN103912886A CN103912886A CN201410102046.4A CN201410102046A CN103912886A CN 103912886 A CN103912886 A CN 103912886A CN 201410102046 A CN201410102046 A CN 201410102046A CN 103912886 A CN103912886 A CN 103912886A
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- blowpipe
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- pressure pipe
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Abstract
An intermittent supercritical unit stabilized-pressure pipe blowing method is characterized in that boiler stoppage and shutdown is omitted in the process of supercritical boiler stabilized-pressure pipe blowing, reduced-pressure pipe blowing is performed in hot grinding time first, stabilized-pressure pipe blowing is gradually applied instead, reduced-pressure pipe blowing is applied 2 hours after blowing, a stabilized pressure method is applied after reduced-pressure blowing is performed 5-10 times, and the adverse influences of long pipe blowing period and high oil consumption caused by low condition disturbance in the whole stabilized-pressure pipe blowing process are avoided. The intermittent supercritical unit stabilized-pressure pipe blowing method has the advantages that the defects of long pipe blowing period and high oil consumption of a supercritical unit can be improved, pipe blowing quality is guaranteed, debugging period can be shortened effectively, and fuel is greatly saved.
Description
Technical field
The invention belongs to thermal power plant field, is for postcritical a kind of guarantee under the prerequisite of blowpipe quality, can shorten duration, the fuel-efficient method of debugging.
Background technology
Voltage stabilizing or step-down blowpipe have the weak point of oneself: step-down blowpipe temperature, pressure parameter in blowpipe process change greatly, be conducive to that tube wall impurity comes off, the advantage such as effective, but it is shorter that step-down blowpipe pressure-drop coefficient is greater than effective blowpipe time of 1.4 o'clock, once generally only have about 40 seconds, blowpipe total degree is more, and fuel consumption is large, and water storage tank water level control when step-down blowpipe is more difficult, water storage tank temperature inversion is larger, also larger to metal life consumption.Voltage stabilizing blowpipe has that hydrodynamic force operating mode is stable, effective long, advantages such as pulverized coal preparation system, capable of saving fuel oil that can put into operation in advance of purge time, but also have that operating mode disturbance is less, water consumption is large, the shortcoming such as the higher overtemperature of thermic load, input coefficient are more.
In conventional blowpipe process, according to " fired power generating unit start steam-line blowing directive/guide " electricity combine 1998] regulation in No. 179, when voltage stabilizing purge, boiler boosts to purge pressure, opens gradually blowpipe control gate.After control gate standard-sized sheet, keep blowpipe pressure, after purge certain hour, gradually reduce fuel quantity, turn down control gate until complete shut-down, one time blowpipe finishes.After one time blowpipe finishes, answer step-down cooling, adjacent purge should stop the interval of 12h.But in actual application, this blowpipe mode duration length consuming time, fuel consume is more, is unfavorable for current energy-saving and cost-reducing requirement.
In actual implementation process, because business demineralized water loss amount in service is less, demineralized water preparative capacibility when design is generally less, generally at 150t/h, and between limber up period, need with a large amount of demineralized waters for pipe flushing and blowpipe, so the preparative capacibility of demineralized water is also one of bottleneck of restriction blowpipe debugging duration.
Super critical boiler is stricter for prefiring rinsing requirement, after cold and hot state flushing is qualified, can light a fire.Especially between limber up period, pipeline impurity, residue, iron rust are more, need expend a large amount of demineralized waters and carry out boiler flushing.Therefore, be 6000t left and right (two storage tank summations) for general power plant demineralized water storage capacity, rinse stage just needs 1500t left and right, and the about 500t in water tank bottom leaves outside its use, because lasting water-making ability is limited, blowpipe energy water total amount is also relatively less again.
In voltage stabilizing blowpipe process, because voltage stabilizing blowpipe water consumption is larger, generally at 900～1200t/h, blowpipe approximately sustainable about 3.5 hours.In conventional voltage stabilizing blowpipe, continue voltage stabilizing blowpipe always, when the desalination water yield approaches 1000t/h, be about to begin and stop voltage stabilizing blowpipe, change gradually step-down blowpipe into and practice shooting.But because the disturbance of voltage stabilizing blowpipe is less, the unknown of blowpipe effect, target practice may not necessarily be qualified, and residue moisture storage capacity is less, and step-down blowpipe number of times is limited, continues water processed after then can only blowing out and blowpipe again.This has not only extended the duration, and has strengthened fuel consumption.
For above-mentioned situation, invent step supercritical unit blowpipe method, can effectively address the above problem, optimize individual blowpipe scheme.
Summary of the invention
The object of patent of the present invention is between new unit limber up period, by optimizing conventional blowpipe mode, reaches and shortens debugging duration and fuel-efficient object.
The object of patent of the present invention is achieved by the following technical solution:
In super critical boiler voltage stabilizing blowpipe process, not blowing out, not flame-out, first utilize warm time consuming to carry out step-down blowpipe, after warm good mill, change gradually voltage stabilizing blowpipe into, carry out 2 hours or consume the desalination water yield while approaching 2000t at voltage stabilizing blowpipe, change accumulation of energy voltage drop method into, according to the control of temperature and pressure, pipeline is carried out to purge 5～10 times, during can practice shooting and look at purge effect; Change again voltage stabilizing blowpipe into, in the time continuing voltage stabilizing blowpipe 2 hours or the desalination water yield approaches 1000t/h, then change gradually step-down blowpipe into, step-down practice shooting until practice shooting qualified.
Patent advantage of the present invention and effect:
Patent of the present invention can be in the boiler blow piping debug phase, reduction of erection time, capable of saving fuel oil consumption;
This technology at home certain power plant is implemented, is ensureing, under the prerequisite of blowpipe quality, to have shortened the debugging duration, and once, blowing out interval is about approximately 4 days in blowing out in the original plan; During blowpipe, share fuel oil 372.6t, general blowpipe greatly about 600t～900t left and right, therefore, can be saved 300(t with oil) ten thousand yuan of × 0.8() ten thousand yuan of=240().
Detailed description of the invention
In super critical boiler voltage stabilizing blowpipe process, first utilize the time of warm mill, adopt accumulation of energy voltage drop method blowpipe, by the cold and hot conversion of pipeline, pipeline is carried out to preliminary purge; Mode by voltage stabilizing+step-down+voltage stabilizing is to the sufficient purge of pipeline again, and it is qualified that rear step-down is practiced shooting, during blowpipe, and not blowing out, flame-out.Carry out 2 hours or consume the desalination water yield while approaching 2000t at voltage stabilizing blowpipe, changing accumulation of energy voltage drop method into, according to the control of temperature and pressure, pipeline being carried out to purge 5～10 times, during can practice shooting and look at purge effect; Change again voltage stabilizing blowpipe into, in the time continuing voltage stabilizing blowpipe 2 hours or the desalination water yield approaches 1000t/h, then change gradually step-down blowpipe into, step-down practice shooting until practice shooting qualified.
Claims (1)
1. a step supercritical unit voltage stabilizing blowpipe method, it is characterized in that, in super critical boiler voltage stabilizing blowpipe process, not blowing out, not flame-out, first utilize warm time consuming to carry out step-down blowpipe, after warm good mill, change gradually voltage stabilizing blowpipe into, carry out 2 hours or consume the desalination water yield while approaching 2000t at voltage stabilizing blowpipe, change accumulation of energy voltage drop method into, according to the control of temperature and pressure, pipeline is carried out to purge 5～10 times, during can practice shooting and look at purge effect; Change again voltage stabilizing blowpipe into, in the time continuing voltage stabilizing blowpipe 2 hours or the desalination water yield approaches 1000t/h, then change gradually step-down blowpipe into, step-down practice shooting until practice shooting qualified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410102046.4A CN103912886A (en) | 2014-03-19 | 2014-03-19 | Intermittent supercritical unit stabilized-pressure pipe blowing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410102046.4A CN103912886A (en) | 2014-03-19 | 2014-03-19 | Intermittent supercritical unit stabilized-pressure pipe blowing method |
Publications (1)
| Publication Number | Publication Date |
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| CN103912886A true CN103912886A (en) | 2014-07-09 |
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| CN201410102046.4A Pending CN103912886A (en) | 2014-03-19 | 2014-03-19 | Intermittent supercritical unit stabilized-pressure pipe blowing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104896490A (en) * | 2015-06-18 | 2015-09-09 | 广东电网有限责任公司电力科学研究院 | Drum boiler pipe blowing debugging method and system |
| CN104930542A (en) * | 2015-06-18 | 2015-09-23 | 广东电网有限责任公司电力科学研究院 | Ultra-supercritical coal-fired boiler unit start adjusting method and system |
| CN105352361A (en) * | 2015-11-13 | 2016-02-24 | 广东电网有限责任公司电力科学研究院 | Steam pipe blowing method for ultra-supercritical once-through boiler with no boiler water pump |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104896490A (en) * | 2015-06-18 | 2015-09-09 | 广东电网有限责任公司电力科学研究院 | Drum boiler pipe blowing debugging method and system |
| CN104930542A (en) * | 2015-06-18 | 2015-09-23 | 广东电网有限责任公司电力科学研究院 | Ultra-supercritical coal-fired boiler unit start adjusting method and system |
| CN105352361A (en) * | 2015-11-13 | 2016-02-24 | 广东电网有限责任公司电力科学研究院 | Steam pipe blowing method for ultra-supercritical once-through boiler with no boiler water pump |
| CN105352361B (en) * | 2015-11-13 | 2017-09-01 | 广东电网有限责任公司电力科学研究院 | For steam-line blowing method of the ultra supercritical without stove water pump direct current cooker |
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Application publication date: 20140709 |