CN104534442A - Low mass flow speed ultra-supercritical boiler water circulation device and water circulation method - Google Patents
Low mass flow speed ultra-supercritical boiler water circulation device and water circulation method Download PDFInfo
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- CN104534442A CN104534442A CN201410825466.5A CN201410825466A CN104534442A CN 104534442 A CN104534442 A CN 104534442A CN 201410825466 A CN201410825466 A CN 201410825466A CN 104534442 A CN104534442 A CN 104534442A
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- supercritical boiler
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Abstract
The invention discloses a low mass flow speed ultra-supercritical boiler water circulation device and water circulation method. An existing ultra-supercritical boiler water circulation system has the defects that the system is complicated in structure and large in manufacturing and installing workload, and a water cooling wall is large in system resistance because of high mass flow speed. The low mass flow speed ultra-supercritical boiler water circulation device comprises an upper hearth and a lower hearth, wherein the lower hearth (1) is an area defined by a lower hearth water cooling wall (2), the upper hearth (3) is an area defined by an upper hearth water cooling wall (4), the lower end of the lower hearth water cooling wall is connected with a lower header (5), the upper end of the lower hearth water cooling wall is connected with a middle mixing header (6) which is then connected with the upper hearth water cooling wall, and the upper end of the upper hearth water cooing wall is connected with an upper header (7); the lower hearth comprises a cold ash hopper (8), a furnace arch area (9) is arranged in the upper hearth, and optimized internal threaded pipes are adopted at the portions, between an inflection point of the cold ash hopper and the furnace arch area, of the water cooling walls. The low mass flow speed ultra-supercritical boiler water circulation device and water circulation method are used for an ultra-supercritical boiler water circulation system.
Description
technical field:
the present invention relates to a kind of low-quality flow ultra-supercritical boiler water EGR and water circulation method.
background technology:
the existing ultra-supercritical boiler water circulatory system has two profiles formula: a kind of high-quality flow velocity vertical water wall for band orifice ring; Another kind of for adopting the Spiral Coil Waterwall of high-quality flow velocity.It is more complicated all to there is structure in these two kinds of water-cooling wall patterns, manufacture and installation workload greatly and the shortcoming such as the water screen system resistance that causes of high-quality flow velocity is larger.
summary of the invention:
the object of this invention is to provide a kind of low-quality flow ultra-supercritical boiler water EGR and water circulation method.
above-mentioned object is realized by following technical scheme:
a kind of low-quality flow ultra-supercritical boiler water EGR, its composition comprises: upper and lower burner hearth, described lower hearth is the region that lower hearth water-cooling wall encloses, described upper furnace is the region that upper furnace water-cooling wall encloses, described lower hearth water-cooling wall lower end is connected with lower header, upper end is connected with middle mixing header, and described middle mixing header is connected with upper furnace water-cooling wall again, and the upper end of described upper furnace water-cooling wall is connected with upper collecting chamber; Described lower hearth comprises furnace hopper, is provided with furnace arch, furnace nose region in described upper furnace, and the water-cooling wall between described furnace hopper flex point place and described furnace arch, furnace nose region adopts optimized ribbed tubing.
described low-quality flow ultra-supercritical boiler water EGR, described upper and lower furnace wall cooling is vertical tube coil pattern, and water screen tube adopts Large Diameter Pipeline membrane type structure, and the mass velocity of intraductal working medium is lower, and its assignment of traffic is positive flow response.
a water circulation method for described low-quality flow ultra-supercritical boiler water EGR, the method step is as follows:
ultra-supercritical boiler feedwater is under the promotion of feed pump pressure head, after economizer preheating, enter water-cooling wall lower header, then enter in water screen tube, vertical upflow, by the region that lower hearth water-cooling wall encloses, i.e. lower hearth, comprise furnace hopper, the heat of high-temperature flue gas in simultaneously stability burner hearth, enter middle mixing header, fully mix in middle mixing header, eliminate working medium in lower hearth due to temperature deviation that inequality of absorbing heat causes; Then vertical upflow is continued, the region enclosed by upper furnace water-cooling wall, i.e. upper furnace, comprise furnace arch, furnace nose region, continue heat absorption simultaneously, finally enter water-cooling wall upper collecting chamber, in upper collecting chamber, mixing is rear again just directly enters into superheater system by separator; Ultra-supercritical boiler feedwater is once by water-cooling wall region, and its water-cycling mode belongs to the direct current cooker of forced flow.
beneficial effect of the present invention:
water screen tube of the present invention is owing to have employed Large Diameter Pipeline membrane type structure, and mass velocity lower (900-1100 kg/m2s), its intraductal working medium assignment of traffic is positive flow response.So-called positive flow response, namely when certain root water-cooling wall pipe caloric receptivity increases, the working medium flow also corresponding increase of this pipe, working medium improves the cooling capacity of pipe, partial offset falls pipe caloric receptivity increases the wall temperature rising caused, the tube wall temperature of this water-cooling wall pipe is effectively controlled, ensure that the security of water circulation system.The middle mixing header of installing between upper and lower furnace wall cooling simultaneously.Effectively can eliminate the deviation of the heat absorption of lower hearth water-cooling wall working medium and temperature.
present invention employs low-quality flow vertical tube coil technology, while keeping the stability of ultra-supercritical boiler water circulation, increasing water screen tube operational reliability, simplify water screen system structure, reduce manufacture, installation, maintenance workload and work difficulty; Greatly reduce the resistance of water screen system, reduce feed pump power consumption, thus decrease unit station service, improve the economy of power plant.
present invention employs optimized ribbed tubing technology, when working medium flows in optimized ribbed tubing, rotate because the effect being subject to internal thread produces, enhance the disturbance of fluid near inside pipe wall face, avoid steam bubble gathering on tube wall face formed " steam film ", thus effectively prevent the generation of film boiling, expand the reliable scope of application of nucleate boiling, therefore prevent from departing from the generation of nucleate boiling under being conducive to realizing running on the lower load, improve the security of water-cooling wall.
accompanying drawing illustrates:
accompanying drawing 1 is structural representation of the present invention.
detailed description of the invention:
embodiment 1:
a kind of low-quality flow ultra-supercritical boiler water EGR, its composition comprises: upper and lower burner hearth, described lower hearth 1 is the region that lower hearth water-cooling wall 2 encloses, described upper furnace 3 is the region that upper furnace water-cooling wall 4 encloses, described lower hearth water-cooling wall lower end is connected with lower header 5, upper end is connected with middle mixing header 6, and described middle mixing header is connected with upper furnace water-cooling wall 4 again, and the upper end of described upper furnace water-cooling wall is connected with upper collecting chamber 7; Described lower hearth comprises furnace hopper 8, is provided with furnace arch, furnace nose region 9 in described upper furnace, and the water-cooling wall between described furnace hopper flex point place and described furnace arch, furnace nose region adopts optimized ribbed tubing.
embodiment 2:
low-quality flow ultra-supercritical boiler water EGR according to embodiment 1, described upper and lower furnace wall cooling is vertical tube coil pattern, and water screen tube adopts Large Diameter Pipeline membrane type structure, and the mass velocity of intraductal working medium is lower, and its assignment of traffic is positive flow response.
embodiment 3:
weigh a water circulation method for the described low-quality flow ultra-supercritical boiler water EGR of one of embodiment 1-2, the method step is as follows:
ultra-supercritical boiler feedwater is under the promotion of feed pump pressure head, after economizer preheating, enter water-cooling wall lower header, then enter in water screen tube, vertical upflow, by the region that lower hearth water-cooling wall encloses, i.e. lower hearth, comprise furnace hopper, the heat of high-temperature flue gas in simultaneously stability burner hearth, enter middle mixing header, fully mix in middle mixing header, eliminate working medium in lower hearth due to temperature deviation that inequality of absorbing heat causes; Then vertical upflow is continued, the region enclosed by upper furnace water-cooling wall, i.e. upper furnace, comprise furnace arch, furnace nose region, continue heat absorption simultaneously, finally enter water-cooling wall upper collecting chamber, in upper collecting chamber, mixing is rear again just directly enters into superheater system by separator; Ultra-supercritical boiler feedwater is once by water-cooling wall region, and its water-cycling mode belongs to the direct current cooker of forced flow.
Claims (3)
1. a low-quality flow ultra-supercritical boiler water EGR, its composition comprises: upper and lower burner hearth, it is characterized in that: described lower hearth is the region that lower hearth water-cooling wall encloses, described upper furnace is the region that upper furnace water-cooling wall encloses, described lower hearth water-cooling wall lower end is connected with lower header, upper end is connected with middle mixing header, and described middle mixing header is connected with upper furnace water-cooling wall again, and the upper end of described upper furnace water-cooling wall is connected with upper collecting chamber; Described lower hearth comprises furnace hopper, is provided with furnace arch, furnace nose region in described upper furnace, and the water-cooling wall between described furnace hopper flex point place and described furnace arch, furnace nose region adopts optimized ribbed tubing.
2. low-quality flow ultra-supercritical boiler water EGR according to claim 1, is characterized in that: described upper and lower furnace wall cooling is vertical tube coil pattern, and water screen tube adopts Large Diameter Pipeline membrane type structure.
3. a water circulation method for the low-quality flow ultra-supercritical boiler water EGR that one of claim 1-2 is described, is characterized in that: the method step is as follows:
Ultra-supercritical boiler feedwater is under the promotion of feed pump pressure head, after economizer preheating, enter water-cooling wall lower header, then enter in water screen tube, vertical upflow, by the region that lower hearth water-cooling wall encloses, i.e. lower hearth, comprise furnace hopper, the heat of high-temperature flue gas in simultaneously stability burner hearth, enter middle mixing header, fully mix in middle mixing header, eliminate working medium in lower hearth due to temperature deviation that inequality of absorbing heat causes; Then vertical upflow is continued, the region enclosed by upper furnace water-cooling wall, i.e. upper furnace, comprise furnace arch, furnace nose region, continue heat absorption simultaneously, finally enter water-cooling wall upper collecting chamber, in upper collecting chamber, mixing is rear again just directly enters into superheater system by separator; Ultra-supercritical boiler feedwater is once by water-cooling wall region, and its water-cycling mode belongs to the direct current cooker of forced flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410825466.5A CN104534442A (en) | 2014-12-28 | 2014-12-28 | Low mass flow speed ultra-supercritical boiler water circulation device and water circulation method |
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| CN201410825466.5A CN104534442A (en) | 2014-12-28 | 2014-12-28 | Low mass flow speed ultra-supercritical boiler water circulation device and water circulation method |
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| CN104534442A true CN104534442A (en) | 2015-04-22 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105485654A (en) * | 2016-01-18 | 2016-04-13 | 西安交通大学 | Boiler water circulation device with middle mixing headers and pressure balance pipes |
| CN105526575A (en) * | 2015-12-25 | 2016-04-27 | 哈尔滨锅炉厂有限责任公司 | Water cooled wall middle mixing system applied to ultra-supercritical boiler and improvement method |
| CN108534118A (en) * | 2018-03-30 | 2018-09-14 | 东方电气集团东方锅炉股份有限公司 | A kind of overcritical or ultra supercritical water wall of monotube boiler structure |
| CN111780097A (en) * | 2020-06-24 | 2020-10-16 | 西安交通大学 | Ultra-supercritical circulating fluidized bed boiler screen type heating surface with intermediate mixing header and boiler |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105526575A (en) * | 2015-12-25 | 2016-04-27 | 哈尔滨锅炉厂有限责任公司 | Water cooled wall middle mixing system applied to ultra-supercritical boiler and improvement method |
| CN105485654A (en) * | 2016-01-18 | 2016-04-13 | 西安交通大学 | Boiler water circulation device with middle mixing headers and pressure balance pipes |
| CN108534118A (en) * | 2018-03-30 | 2018-09-14 | 东方电气集团东方锅炉股份有限公司 | A kind of overcritical or ultra supercritical water wall of monotube boiler structure |
| CN108534118B (en) * | 2018-03-30 | 2023-10-31 | 东方电气集团东方锅炉股份有限公司 | Water-cooled wall structure of supercritical or ultra-supercritical once-through boiler |
| CN111780097A (en) * | 2020-06-24 | 2020-10-16 | 西安交通大学 | Ultra-supercritical circulating fluidized bed boiler screen type heating surface with intermediate mixing header and boiler |
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Application publication date: 20150422 |