CN1594967A - Circulation fluidized bed boiler with re-heating - Google Patents
Circulation fluidized bed boiler with re-heating Download PDFInfo
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- CN1594967A CN1594967A CN 200410009223 CN200410009223A CN1594967A CN 1594967 A CN1594967 A CN 1594967A CN 200410009223 CN200410009223 CN 200410009223 CN 200410009223 A CN200410009223 A CN 200410009223A CN 1594967 A CN1594967 A CN 1594967A
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Abstract
This invention is a boiler with the fluid-bed of reheating cycle, and belongs to reheating boiler and reheating device collocation manner and gas temperature adjusting technology field. The characteristics lies in the reheater is partially fixed in the firing chamber of the boiler, the other part is fixed in the gas passage at the tail and adjust the reheating steam temperature through the water rejection. The collocation of the reheater is simple, the adjustment of the water injection is flexible and accurate, the respond time of the adjusting is short, in the range of 41% above charge, decrease the temperature through relatively small and stable water injection, the reheating gas temperature can reach the rating and assure the steam generator block has relatively high economic function; the gross being heated area is small, the investment of construction is low, the facture is simple and the maintaining is convenient.
Description
Technical field
The invention belongs to reheat boiler reheater arrangement, reheat steam temperature control method field.Relate in particular to a kind of CFBB reheater arrangement, reheat steam temperature control method.
Background technology
The Properties of CFB that has again heat is compared with the Properties of CFB of not having again heat, its Turbo-generator Set whole efficiency height, and its difficult point and key are the arrangement form of reheater and the control method of reheated steam.The control method of reheat steam temperature and the arrangement form of reheater have confidential relation simultaneously.
At present, having again in the world wide, the large-scale circulation fluidized bed of heat is divided into fluidized bed heat exchanger type and reheater bypass type.Reheater is arranged in and mainly contains Lurgi type recirculating fluidized bed in the fluid-bed heat exchanger, and the INTREX of Foster Wheeler company employing.This two class has the CFBB of heat again, arranges in the fluid-bed heat exchanger that the principle of reheater is similar to the Switching Logic Control of Reheat Steam Temperature mode.Arranging section or whole reheater in the fluid-bed heat exchanger, remaining reheater is arranged in back-end ductwork.The part superheater also is arranged in fluid-bed heat exchanger and the back-end ductwork simultaneously.The caloric receptivity of the heating surface in the fluid-bed heat exchanger depends primarily on hot grey flow.Adjusting enters reheater place fluid-bed heat exchanger ash flow, and the caloric receptivity of regulating reheater is a reheat steam temperature.When regulating reheat steam temperature, overheated temperature is influenced, regulates overheating steam temperature by regulating superheater desuperheat injection flow rate again, therefore brings serious difficulty to operation; Equipment complexity in addition, the construction investment expense improves relatively; This regulative mode is slower to the response of the adjustment process of reheat steam temperature, and only can be used for coarse adjustment, in the time of need be to the reheat steam temperature fine tuning, also needs to adopt alternate manner, regulate as the twin flue baffle plate, even water spray solves.Because the flow of the recycle stock of material circulating system and the relation between temperature and the load thereof do not have matching, be lower than 82% when following at load, regulate difficult.
Reheater bypass type is with big of reheater or all is arranged in back-end ductwork, the part reheated steam low-temperature zone reheater of flowing through is only arranged, vapor mixing behind remaining not heated reheated steam and the process low-temperature zone reheater heat temperature raising enters the reheater high temperature section that is arranged in the back-end ductwork then.By regulating the reheated steam flow of reheater low-temperature zone, promptly regulate the mode of bypass reheated steam flow and regulate high temperature section reheater import steam temperature, and then regulate the reheated steam final temperature.The subject matter of this regulative mode is that adjustment is dumb, low-temperature zone overtemperature prote poor performance, and temperature regulating range is little, and big to the drag effects of reheater system.
Summary of the invention
At the deficiencies in the prior art and defective, the object of the invention and task provide a kind of CFBB of heat again that has, and make it not only simple in structure, and the construction investment expense is little, and is reliable, and the reheat steam temperature adjustable range is big.
Purpose of the present invention and task are achieved by the following technical solution:
A kind of CFBB of heat again that has, comprise combustion chamber and the back-end ductwork that is provided with the convection type reheater, it is characterized in that: arrange the low-temperature zone reheater at described top of combustion chamber, described back-end ductwork is arranged the high temperature section reheater, perhaps arrange the high temperature section reheater, arrange the low-temperature zone reheater at back-end ductwork at top of combustion chamber; And between the double reheating device, being provided with the feedwater direct-contact desuperheater, high temperature section in the described combustion chamber or low-temperature zone reheater adopt screen formula reheater.
The present invention compared with prior art, have the following advantages and beneficial effect: the layout of reheater of the present invention is simple, reheat steam temperature is regulated flexibly accurately, the governing response time is short, in the load variations scope more than 41%, pass through less stable spray desuperheating, reheat steam temperature all can reach rated value, guarantees that Turbo-generator Set has higher economical efficiency; Total heating surface is long-pending less, saves steel, and the construction investment expense is little; Make simple, easy to maintenance.
Description of drawings
Fig. 1 is the variation relation schematic diagram of combustion chamber reheater and back-end ductwork reheater heat absorption share with rate of load condensate.
Fig. 2 arranges the low-temperature zone reheater in the combustion chamber, arrange the high temperature section reheater at back-end ductwork, arranges direct-contact desuperheater between the double reheating device.
Fig. 3 arranges the low-temperature zone reheater in the combustion chamber, arrange the high temperature section reheater at back-end ductwork, arranges direct-contact desuperheater between the double reheating device.
Among Fig. 1: total heat absorption share of a-reheater; B-is positioned at heat absorption part of combustion chamber reheater; C-is positioned at the heat absorption share of afterbody reheater;
Among Fig. 2,3: the reheated steam pipe that 1-comes from steam turbine; 2-low-temperature zone reheater inlet header case; 3-low-temperature zone reheater outlet collection case; 4-low-temperature zone reheater; The 5-combustion chamber; The 6-back-end ductwork; 7-high temperature section reheater; 8-high temperature section reheater outlet collection case; 9-is to the reheated steam pipe of steam turbine; 10-high temperature section reheater inlet header case; The 11-direct-contact desuperheater; The 12-sparge pipe.
The specific embodiment
The heat absorption share of the heating surface of burning in circulating fluid bed boiler chamber and rate of load condensate have special relation (as shown in Figure 1), and curve a represents total heat absorption share of reheater among the figure; Curve b represents to be positioned at the heat absorption share of combustion chamber reheater; Curve c represents to be positioned at the heat absorption share of afterbody reheater; Along with the decline of load, in 50% above load range, the heat absorption share of the heating surface of burning in circulating fluid bed boiler chamber increases; And the heat absorption share of afterbody convection heating surface descends, and sum of the two is almost a constant, thereby the desuperheating water injection flow rate of reheated steam is kept a constant substantially with the ratio of the specified quantity of steam of reheated steam.According to this thought, it is indoor that the present invention is arranged in burning in circulating fluid bed boiler with the part of reheater, and a part is arranged in back-end ductwork, regulates reheat steam temperature by the feedwater water spray.Promptly adopt the arrangement of two kinds of reheaters, a kind of is that the low-temperature zone reheater is arranged in the combustion chamber, and the high temperature section reheater is arranged in back-end ductwork, arranges direct-contact desuperheater (as shown in Figure 2) between the double reheating device; Another kind is that the high temperature section reheater is arranged in the combustion chamber, and the low-temperature zone reheater is arranged in back-end ductwork, arranges direct-contact desuperheater (as shown in Figure 3) between the double reheating device.According to the ash formation of rated capacity of boiler, coal and the wear characteristic of ash, the area of the heating surface of appropriate design reheater each several part, can make the spray desuperheating water water yield all little when rated load and varying duty, have higher economical efficiency to guarantee Turbo-generator Set than fluid-bed heat exchanger arrangement and reheater bypass arrangement mode.
Be further described below in conjunction with 3 pairs of courses of work of the present invention of accompanying drawing.
Cold reheat steam enters low-temperature zone reheater inlet header case 2 from the reheated steam pipe 1 of steam turbine, then enter the low-temperature reheater 4 that is positioned at back-end ductwork 6, export collection case 3 through the heating back to the low-temperature zone reheater, enter direct-contact desuperheater 11, through with the water spray mixing temperature adjustment of sparge pipe 12 after, enter high temperature section reheater inlet header case 10, steam enters the high temperature reheater 7 that is positioned at combustion chamber 5 then, collect case 8 to the outlet of high temperature section reheater after being heated to rated temperature, arrive the reheated steam pipe 9 of steam turbine again, do work to turbine expansion.
Along with the reduction of load, the outlet reheat steam temperature that is positioned at the low-temperature reheater 4 of back-end ductwork 6 descends gradually, through a spot of water spray of constant rate almost, again to the high temperature reheater 7 that is positioned at combustion chamber 5.Because along with the reduction of load, the high temperature reheater 7 heat absorption shares that are positioned at combustion chamber 5 increase, and can be heated to rated temperature.The cooperation of high low-temperature reheater, make load 100%～41% on a large scale in during variation, keep less injection flow rate, injection flow rate is generally in 0.45%～1.32% specified reheated steam range of flow the time, reheat steam temperature all can reach nominal parameter.
Claims (1)
1. one kind has the CFBB of heat again, comprise combustion chamber and the back-end ductwork that is provided with the convection type reheater, it is characterized in that: arrange the low-temperature zone reheater at described top of combustion chamber, described back-end ductwork is arranged the high temperature section reheater, perhaps arrange the high temperature section reheater at top of combustion chamber, arrange the low-temperature zone reheater at back-end ductwork, and between the double reheating device, be provided with the feedwater direct-contact desuperheater that high temperature section in the described combustion chamber or low-temperature zone reheater adopt screen formula reheater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410009223 CN1594967A (en) | 2004-06-18 | 2004-06-18 | Circulation fluidized bed boiler with re-heating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410009223 CN1594967A (en) | 2004-06-18 | 2004-06-18 | Circulation fluidized bed boiler with re-heating |
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| Publication Number | Publication Date |
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| CN1594967A true CN1594967A (en) | 2005-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200410009223 Pending CN1594967A (en) | 2004-06-18 | 2004-06-18 | Circulation fluidized bed boiler with re-heating |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100523606C (en) * | 2006-12-07 | 2009-08-05 | 中国科学院工程热物理研究所 | Boiler furnace of circulating fluidized bed with water-cooled column |
| CN101963344A (en) * | 2010-09-13 | 2011-02-02 | 东南大学 | Reheated steam temperature control method on basis of process characteristic compensation |
| CN102798131A (en) * | 2012-09-07 | 2012-11-28 | 中国东方电气集团有限公司 | Boiler capable of preventing contaminating and coking |
| CN103696816A (en) * | 2013-12-15 | 2014-04-02 | 河南省电力勘测设计院 | Intermediate reheating small-capacity split axle type steam-turbine generator set |
| CN107238073A (en) * | 2017-05-31 | 2017-10-10 | 安徽金鼎锅炉股份有限公司 | Biomass burning super-pressure resuperheat unit fluidized-bed combustion boiler |
| CN109751590A (en) * | 2019-02-28 | 2019-05-14 | 西安交通大学 | Double reheat boiler and attemperation of steam method |
| CN112097246A (en) * | 2020-09-25 | 2020-12-18 | 哈尔滨锅炉厂有限责任公司 | Convection reheater for ultra-high pressure boiler |
-
2004
- 2004-06-18 CN CN 200410009223 patent/CN1594967A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100523606C (en) * | 2006-12-07 | 2009-08-05 | 中国科学院工程热物理研究所 | Boiler furnace of circulating fluidized bed with water-cooled column |
| CN101963344A (en) * | 2010-09-13 | 2011-02-02 | 东南大学 | Reheated steam temperature control method on basis of process characteristic compensation |
| CN101963344B (en) * | 2010-09-13 | 2011-12-14 | 东南大学 | Reheated steam temperature control method on basis of process characteristic compensation |
| CN102798131A (en) * | 2012-09-07 | 2012-11-28 | 中国东方电气集团有限公司 | Boiler capable of preventing contaminating and coking |
| CN102798131B (en) * | 2012-09-07 | 2016-04-06 | 中国东方电气集团有限公司 | A kind of boiler preventing contamination coking |
| CN103696816A (en) * | 2013-12-15 | 2014-04-02 | 河南省电力勘测设计院 | Intermediate reheating small-capacity split axle type steam-turbine generator set |
| CN103696816B (en) * | 2013-12-15 | 2016-05-25 | 河南省电力勘测设计院 | A kind of resuperheat low capacity split shaft Turbo-generator Set |
| CN107238073A (en) * | 2017-05-31 | 2017-10-10 | 安徽金鼎锅炉股份有限公司 | Biomass burning super-pressure resuperheat unit fluidized-bed combustion boiler |
| CN109751590A (en) * | 2019-02-28 | 2019-05-14 | 西安交通大学 | Double reheat boiler and attemperation of steam method |
| CN112097246A (en) * | 2020-09-25 | 2020-12-18 | 哈尔滨锅炉厂有限责任公司 | Convection reheater for ultra-high pressure boiler |
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