CN102322627A - Heating surface arrangement mode of steam system of 700 DEG C-unit ultra supercritical boiler - Google Patents
Heating surface arrangement mode of steam system of 700 DEG C-unit ultra supercritical boiler Download PDFInfo
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- CN102322627A CN102322627A CN201110276427A CN201110276427A CN102322627A CN 102322627 A CN102322627 A CN 102322627A CN 201110276427 A CN201110276427 A CN 201110276427A CN 201110276427 A CN201110276427 A CN 201110276427A CN 102322627 A CN102322627 A CN 102322627A
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Abstract
The invention relates to a heating surface arrangement mode of a steam system of a 700 DEG C-unit ultra supercritical boiler. According to the system, a wall-hanging radiant heating surface is additionally arranged in the original 600 DEG C-unit ultra supercritical boiler. At the steam side, the newly-added overheat steam heating surface is arranged between the original low-temperature superheater and the original screen-type superheater, and the newly-added reheated steam heating surface is arranged between the original low-temperature superheater and the original secondary reheater, therefore the problem that the proportion of the overheat steam heat absorption and the reheated steam heat absorption of the 700 DEG C-unit ultra supercritical boiler is increased in solved. Meanwhile, in a boiler body, the newly-added wall-hanging radiant heating surface is arranged on a heating surface of an evaporating section of a water-cooled wall of the boiler so as to shield a part of heating surface of the evaporating section and reduce the heat absorption amount of the evaporating section of the water-cooled wall, therefore the position of a working medium, which generates a phase transformation points, is far away from the center of flame, and external heat load at the phase transformation point is reduced, the heat transfer worsening problem which can happen possibly is prevented, and the purpose of protecting the heating surface is achieved.
Description
Technical field
The present invention relates to a kind of vapour system that is used for 700 ℃ of unit ultra-supercritical boilers, be specifically related to a kind of heating surface arrangement of vapour system of 700 ℃ of unit ultra-supercritical boilers.
Background technology
700 ℃ of unit ultra-supercritical boilers are to be about to develop the following station boiler of developing that belongs to for reducing the unit net coal consumption rate.Because main steam and reheat steam temperature are brought up to 700 ℃; Under existing 7 grades or 8 grades of steam bleeding systems, the feed temperature of boiler will be about 310 ℃, even if economizer only makes vapor (steam) temperature raise 10 ℃; The vapor (steam) temperature that gets into water-cooling wall inlet collection case will reach more than 320 ℃; In this case, the heat absorption ratio of boiler water wall evaporator section steam only accounts for about 16.2% of heat absorption total amount, and the heat absorption ratio of superheated steam and reheated steam is up to about 83.8%; And existing 600 ℃ of unit ultra-supercritical boilers, the heat absorption ratio of its boiler water wall evaporator section steam accounts for about 21.3% of heat absorption total amount, and the heat absorption ratio of superheated steam and reheated steam is about 78.7%.
600 ℃ of unit ultra-supercritical boilers of active service; Its boiler platen superheater lower edge entrance flue gas temperature up to 1350 ℃ about; Slagging scorification aspect in prevention pendant superheater and burner hearth is seen; This temperature possibly improve hardly again, and the burner hearth entrance flue gas temperature after process pendant superheater and the back screen superheater cooling is about 960 ℃.Because the caloric receptivity that convection superheater of arranging in pendant superheater and back screen superheater and the flue and reheater all belong to overheated or reheated steam.Therefore, adjustment burner hearth entrance flue gas temperature can not effectively change the caloric receptivity (can only change the heat absorption ratio of different heating surfaces) of (promptly increasing) whole superheater or reheater system.This shows; Distribute from the inner flue gas of the stove thermal discharge of boiler; No matter be 600 ℃ of unit ultra-supercritical boilers or 700 ℃ of unit ultra-supercritical boilers, it almost is certain that its flue gas is put to the burner hearth (evaporation heat absorption and overheated heat absorption) and the heat ratio of flue (pure overheated heat absorption).
Be 1350 ℃ and advance the economizer entrance flue gas temperature and calculate for 460 ℃ with 600 ℃ of unit ultra-supercritical boiler pendant superheater lower edge entrance flue gas temperatures; Flue gas is put to the heat of superheating system and is made up of the radiation of the radiation heat absorption of flue gas enthalpy drop, pendant superheater, back screen superheater and water-cooling wall superheat section heating surface three parts of absorbing heat, and toatl proportion is about 78%.Compare with the steam side heat absorption of previous calculations, both still can coordinate.For 700 ℃ of unit ultra-supercritical boilers; If the heat absorption of water-cooling wall superheat section reduces or does not increase (promptly keep its outlet temperature identical with the steam exit temperature of 600 ℃ of unit ultra-supercritical boilers); In this case; Still can be 1350 ℃ and advance 460 ℃ of economizer entrance flue gas temperatures and calculate flue gas and put heat ratio that its result is identical with the checkout result of 600 ℃ of ultra-supercritical boilers in pendant superheater lower edge entrance flue gas temperature to steam side and evaporation side.Compare with 700 ℃ of ultra-supercritical boiler steam side heat absorption ratios of previous calculations, can clearly be seen that, flue gas is put shortage of heat to superheated steam and reheated steam vapor (steam) temperature is heated to 700 ℃.If improve the outlet steam temperature of 700 ℃ of unit ultra-supercritical boiler water-cooling wall superheat sections; Owing to will guarantee the heat transfer temperature and pressure of heating surface; Therefore, getting into the economizer entrance flue gas temperature will be greater than 460 ℃, in other words; Increase water-cooling wall superheat section outlet steam temperature, the heat that flue gas is put to steam side will reduce because of the raising of economizer inlet flue gas temperature.This shows that the outlet steam temperature that adopts conventional method to improve the water-cooling wall superheat section can not effectively increase the caloric receptivity of steam side, thereby can't satisfy the purpose that 700 ℃ of unit ultra-supercritical boilers are heated to vapor (steam) temperature 700 ℃.
On the other hand; The heat absorption ratio of 700 ℃ of unit ultra-supercritical boiler water-cooling wall evaporator sections reduces; The phase transformation temperature points of working medium is moved down (promptly moving) to flame kernel; This certainly will make the transformation temperature place raise by the external heat load, and the probability of transformation temperature generation heat transfer deterioration and this place's water-cooling wall booster is increased.
Summary of the invention
The objective of the invention is to the problems referred to above, a kind of heating surface arrangement of vapour system of 700 ℃ of unit ultra-supercritical boilers that can change 700 ℃ of unit ultra-supercritical boiler vapor phase height positions is provided.
For achieving the above object; The technical scheme that the present invention adopts is: the steam side in the vapour system of existing 600 ℃ of unit ultra-supercritical boilers is set up one-level or wall-hanging radiation superheater of secondary and wall-hanging radiation reheater respectively; The heating surface of wall-hanging radiation superheater and wall-hanging radiation reheater is on the evaporator section heating surface of the following water-cooling wall of transformation temperature with the arranged in form of wall-hanging radiation heating-surface on the boiler furnace water-cooling wall steam section of sending out; And wall-hanging radiation superheater is arranged between low temperature superheater and the pendant superheater; And be connected through pipeline with low temperature superheater and pendant superheater; Wall-hanging radiation reheater is arranged between one-level reheater and the secondary reheater, and is connected through pipeline with one-level reheater and former secondary reheater.
Described when setting up wall-hanging radiation superheater of one-level and wall-hanging radiation reheater; The wall-hanging radiation superheater import of one-level is connected with the low temperature superheater outlet; Its outlet is connected with the pendant superheater import; The import of the wall-hanging radiation reheater of one-level is connected with the outlet of one-level reheater, and its outlet is connected with the import of secondary reheater.
Described when setting up wall-hanging radiation superheater of secondary and wall-hanging radiation reheater; The wall-hanging radiation superheater import of one-level is connected with the low temperature superheater outlet; Its outlet is connected with the wall-hanging radiation superheater import of secondary, and the wall-hanging radiation superheater outlet of secondary is connected with the pendant superheater import; The import of the wall-hanging radiation reheater of one-level is connected with the outlet of one-level reheater, and its outlet is connected with the import of the wall-hanging radiation reheater of secondary, and the outlet of the wall-hanging radiation reheater of secondary is connected with the import of secondary reheater.
The present invention is on the basis of existing 600 ℃ of unit ultra-supercritical boiler vapour systems; Increase wall-hanging radiation superheater and wall-hanging radiation reheater respectively; And with the arranged in form on boiler furnace water-cooling wall steam send out section (be evaporator section water wall surface transformation temperature position below on) of the heating surface that increases newly with wall-hanging radiation heating-surface, the size of its heating surface is confirmed according to heating power result of calculation when boiler design, shaded portions evaporator section heating surface; Reduce the heat absorption of evaporator section heating surface; Thereby move after making working medium undergo phase transition position a little, thereby away from flame kernel, with the protection water-cooling wall; And then form a kind of novel steam-heating system.Simultaneously, to solve the not enough problem of superheated steam and reheated steam heat absorption.Steam is 50 ℃ to 150 ℃ in this newly-increased heating surface temperature increasing degree that forms of absorbing heat.And then solve the not enough and 700 ℃ of ultra-supercritical boiler working medium of 700 ℃ of unit ultra-supercritical boiler superheated steams and reheated steam heat absorption undergo phase transition a position more preceding and to the furnace flame center near problem.
The present invention has following technical characterstic:
1, the present invention newly establishes the wall-hanging radiation heating-surface of one-level or secondary in the vapour system of 600 ℃ of unit ultra-supercritical boilers, original vapour system is become a kind ofly can adapt to 700 ℃ of novel vapour systems that the unit ultra-supercritical boiler is brand-new.
2, the heating surface of newly establishing can promote 50 ℃-150 ℃ with vapor (steam) temperature; When reducing the evaporator section heat absorption; With the heat absorption proportion control of water-cooling wall superheat section in certain scope; So that water-cooling wall superheat section outlet steam temperature is controlled at about 430 ℃, thereby make the economizer input gas temperature not be higher than 460 ℃, finally reach and make flue gas put the purpose that the heat ratio to steam side does not reduce.
3, the position of the transformation temperature of the steam section of 700 ℃ of unit ultra-supercritical boilers changes along with the variation of boiler load; Wall-hanging radiation superheater and the reheater of newly establishing of the present invention; To be arranged in below the minimum transformation temperature of the boiler position; Heating surface to guarantee to newly establish all is being under the various operating modes in the water-cooling wall evaporator section heating surface, makes its vapor (steam) temperature under various loads, can reach design load.
4, wall-hanging radiation superheater and the reheater newly established of the present invention; When promoting vapor (steam) temperature more than 60 ℃; In order to reduce the Temperature Distribution deviation; Wall-hanging pendant superheater of newly establishing or reheater respectively are divided into two stage arrangement, are not more than 80 ℃ to guarantee every grade of temperature increasing degree after the heating surface heat absorption; With minimizing vapor (steam) temperature deviation, and then reach the purpose that reduces heating surface wall temperature distribution bias.
Description of drawings
Fig. 1 is a superheating system design diagram of newly establishing the wall-hanging radiation superheater of secondary of the present invention;
Fig. 2 is a reheat system design diagram of newly establishing the wall-hanging radiation superheater of secondary of the present invention;
Fig. 3 is a superheating system design diagram of newly establishing the wall-hanging radiation superheater of one-level of the present invention;
Fig. 4 is a reheat system design diagram of newly establishing the wall-hanging radiation superheater of one-level of the present invention;
Fig. 5 is the front view sketch map that wall-hanging radiation heating-surface is arranged;
Fig. 6 is the vertical view sketch map that wall-hanging radiation heating-surface is arranged;
The low temperature superheater of label 1-original system among the figure, the wall-hanging radiation superheater of the one-level that 2-newly establishes, the wall-hanging radiation superheater of the secondary that 3-newly establishes; The pendant superheater of 4-original system, the back screen superheater of 5-original system, the finishing superheater of 6-original system; The one-level reheater of 7-original system, the wall-hanging radiation reheater of the one-level that 8-newly establishes, the wall-hanging radiation reheater of the secondary that 9-newly establishes; Secondary reheater in the 10-original system; Final reheater in the 11-original system, the water wall surface of the following evaporator section in 12-transformation temperature position, 13-boiler furnace water-cooling wall evaporator section.
Below in conjunction with accompanying drawing the present invention is done further detailed description.
The specific embodiment
Superheater system of the present invention is set up one-level or the wall-hanging radiation superheater of secondary between low temperature superheater and pendant superheater; Set up one-level or the wall-hanging radiation reheater of secondary at one-level reheater and secondary reheater.The wall-hanging radiation superheater import of the one-level of newly establishing is connected with low temperature superheater; Its outlet is connected with the wall-hanging radiation superheater import of secondary, and latter's outlet is connected with the pendant superheater import; The import of the wall-hanging radiation reheater of the one-level of newly establishing is connected with low-temperature reheater; Its outlet is connected with the import of the wall-hanging radiation reheater of secondary; Latter's outlet is connected with the import of secondary reheater, and the heating surface of wall-hanging radiation superheater and wall-hanging radiation reheater is being on the evaporator section water wall surface below the transformation temperature position on the boiler furnace water-cooling wall evaporator section with the arranged in form of wall-hanging radiation heating-surface.
Below be the embodiment that the inventor provides.
Embodiment 1:
Newly establish the wall-hanging radiation superheater of secondary referring to the superheater system of Fig. 1, present embodiment, be arranged on the evaporator section heating surface of boiler water wall by Fig. 5 and mode shown in Figure 6 respectively, provided superheater system figure among Fig. 1.Steam from water-cooling wall superheat section heating surface gets into the low temperature superheater 1 in the original system; Steam after low temperature superheater 1 heating enters into the wall-hanging radiation superheater 2 of the one-level of newly establishing; Steam after wall-hanging radiation superheater 2 heating of the one-level of newly establishing enters into the wall-hanging radiation superheater 3 of the secondary of newly establishing; Steam after wall-hanging radiation superheater 3 heating of the secondary of newly establishing enters into the pendant superheater 4 of original system; Steam after pendant superheater 4 heating enters into the back screen superheater 5 of original system; Through after steam after pendant superheater 5 heating enter into the finishing superheater 6 of original system, the main steam after finishing superheater 6 heating reaches 700 ℃ and gets into main steam lines.Simultaneously, the wall-hanging screen formula of the secondary that the reheat system of present embodiment is newly established reheater is arranged on the evaporator section heating surface of boiler water wall by Fig. 5 and mode shown in Figure 6 respectively, has provided the reheater system diagram among Fig. 2.Steam discharge from steam turbine gets into one-level (low temperature) reheater 7; Steam after 7 heating of one-level reheater enters into the wall-hanging radiation reheater 8 of the one-level of newly establishing; Steam after wall-hanging radiation reheater 8 heating of the one-level of newly establishing enters into the wall-hanging radiation reheater 9 of the secondary of newly establishing; Steam after wall-hanging radiation reheater 9 heating of the one-level of newly establishing enters into the secondary reheater 10 of original system; Reheated steam after 10 heating of secondary reheater enters into final reheater 11; Reheated steam after final reheater 11 heating reaches 700 ℃ and gets into reheaing steam pipe, and the heating surface of wherein wall-hanging radiation superheater and wall-hanging radiation reheater is being on the water wall surface 12 of the following evaporator section in transformation temperature position on the boiler furnace water-cooling wall evaporator section 13 with the arranged in form of wall-hanging radiation heating-surface.
Embodiment 2:
Newly establish the wall-hanging radiation superheater of one-level referring to the superheater system of Fig. 2, present embodiment, be arranged on the evaporator section heating surface of boiler water wall by Fig. 5 and mode shown in Figure 6 respectively, provided superheater system figure among Fig. 3.Steam from water-cooling wall superheat section heating surface gets into the low temperature superheater 1 in the original system; Steam after low temperature superheater 1 heating enters into the wall-hanging radiation superheater 2 of the one-level of newly establishing; Steam after wall-hanging radiation superheater 2 heating of the one-level of newly establishing enters into the pendant superheater 4 of original system; Steam after pendant superheater 4 heating enters into the back screen superheater 5 of original system; Through after steam after pendant superheater 5 heating enter into the finishing superheater 6 of original system, the main steam after finishing superheater 6 heating reaches 700 ℃ and gets into main steam lines.Simultaneously, the wall-hanging screen formula of the one-level that the reheat system of present embodiment is newly established reheater is arranged on the evaporator section heating surface of boiler water wall by Fig. 5 and mode shown in Figure 6 respectively, has provided the reheater system diagram among Fig. 4.Steam discharge from steam turbine gets into one-level (low temperature) reheater 7; Steam after 7 heating of one-level low-temperature reheater enters into the wall-hanging radiation reheater 8 of the one-level of newly establishing; Steam after wall-hanging radiation reheater 8 heating of the one-level of newly establishing enters into the secondary reheater 10 of original system; Reheated steam after 10 heating of secondary reheater enters into final reheater 11; Reheated steam after final reheater 11 heating reaches 700 ℃ and gets into reheaing steam pipe, and the heating surface of wherein wall-hanging radiation superheater and wall-hanging radiation reheater is being on the water wall surface 12 of the following evaporator section in transformation temperature position on the boiler furnace water-cooling wall evaporator section 13 with the arranged in form of wall-hanging radiation heating-surface.
Operation principle of the present invention is following:
The present invention is through setting up the radiation superheater and the radiation reheater of one-level or secondary in the vapour system of 600 ℃ of ultra-supercritical boilers of active service; And it is designed to wall-hanging form covers on the water-cooling wall evaporator section heating surface; Make water-cooling wall evaporator section working medium undergo phase transition a little position away from flame kernel; Reduce outside wall thermic load thereby reach, the purpose of protection water screen tube; Simultaneously; Solved the problem that to set up new steam heating surface on the flue; And then solved the difficult problem that existing vapour system can't be heated to vapor (steam) temperature 700 ℃; Make 700 ℃ of ultra-supercritical boilers reach coordination, mix from the branch of flue gas thermal discharge and solved 700 ℃ of ultra-supercritical boilers and make its evaporation heat absorption and overheated heat absorption reach coordination with working medium in the heat absorption of flue gas heat release and working medium (be water before the phase transformation, be steam after the phase transformation).
Compare with the vapour system of existing equipment; After adopting the present invention; The flue gas heat release of 700 ℃ of ultra-supercritical boilers and the heat absorption ratio of heating surface are very easy to reach coordination, do not need to evaporate the ratio of absorbing heat with overheated heat absorption in flue gas heat release pro rate and the stove with adopting nonconventional approaches such as improving pendant superheater inlet flue gas temperature or reduction water-cooling wall lower linked box inlet water temperature to change.The boiler body of such 700 ℃ of ultra-supercritical boilers and stove combustion system and accessory system etc. can reach reliably the boiler design of 700 ℃ of ultra-supercritical boilers and the same easy of design change of 600 ℃ of ultra-supercritical boilers with reference to the existing system design of 600 ℃ of ultra-supercritical boilers.
Vapour system of the present invention is very simple, just in existing systems, has increased one-level or secondary heating surface, is easy to design and implements the newly constructed boiler of very suitable 700 ℃ of ultra-supercritical boilers.
Vapour system of the present invention is adapted to 700 ℃ of ultra-supercritical boilers of the various combustion systems of various capacity.
The heating surface of wherein newly establishing is equipped with inlet header case and outlet collection case and necessary adjustment doors.
Claims (3)
1. the heating surface arrangement of the vapour system of 700 ℃ of unit ultra-supercritical boilers; It is characterized in that: the steam side in the vapour system of existing 600 ℃ of unit ultra-supercritical boilers is set up one-level or wall-hanging radiation superheater of secondary and wall-hanging radiation reheater respectively; The heating surface of wall-hanging radiation superheater and wall-hanging radiation reheater is on the evaporator section heating surface of the following water-cooling wall of transformation temperature with the arranged in form of wall-hanging radiation heating-surface on the boiler furnace water-cooling wall steam section of sending out; And wall-hanging radiation superheater is arranged between low temperature superheater and the pendant superheater; And be connected through pipeline with low temperature superheater and pendant superheater; Wall-hanging radiation reheater is arranged between one-level reheater and the secondary reheater, and is connected through pipeline with one-level reheater and former secondary reheater.
2. the heating surface arrangement of the vapour system of 700 ℃ of unit ultra-supercritical boilers according to claim 1; It is characterized in that: described when setting up wall-hanging radiation superheater of one-level and wall-hanging radiation reheater; The wall-hanging radiation superheater of one-level (2) import is connected with low temperature superheater (1) outlet; Its outlet is connected with pendant superheater (4) import; The wall-hanging radiation reheater of one-level (8) import is connected with one-level reheater (7) outlet, and its outlet is connected with secondary reheater import (10).
3. the heating surface arrangement of the vapour system of 700 ℃ of unit ultra-supercritical boilers according to claim 1; It is characterized in that: described when setting up wall-hanging radiation superheater of secondary and wall-hanging radiation reheater; The wall-hanging radiation superheater of one-level (2) import is connected with low temperature superheater (1) outlet; Its outlet is connected with the wall-hanging radiation superheater of secondary (3) import, and the wall-hanging radiation superheater of secondary (3) outlet is connected with pendant superheater (4) import; The wall-hanging radiation reheater of one-level (8) import is connected with one-level reheater (1) outlet, and its outlet is connected with the import of the wall-hanging radiation reheater of secondary (9), and the outlet of the wall-hanging radiation reheater of secondary (9) is connected with the import of secondary reheater (10).
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| CN103196128A (en) * | 2013-03-29 | 2013-07-10 | 上海锅炉厂有限公司 | Power station boiler heating surface design method |
| CN106949451A (en) * | 2017-04-26 | 2017-07-14 | 华中科技大学 | A kind of double reheat ultra-supercritical boiler and its heated surface arrangement method |
| CN107543144A (en) * | 2017-09-11 | 2018-01-05 | 上海申能电力科技有限公司 | A kind of system for improving conventional Subcritical Units dum boiler main steam temperature |
| CN109631008A (en) * | 2018-11-14 | 2019-04-16 | 东方电气集团东方锅炉股份有限公司 | Three dimensional arrangement method and three dimensional arrangement heating surface for Power Station Boiler Heating Surface |
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| CN106949451A (en) * | 2017-04-26 | 2017-07-14 | 华中科技大学 | A kind of double reheat ultra-supercritical boiler and its heated surface arrangement method |
| CN107543144A (en) * | 2017-09-11 | 2018-01-05 | 上海申能电力科技有限公司 | A kind of system for improving conventional Subcritical Units dum boiler main steam temperature |
| CN109631008A (en) * | 2018-11-14 | 2019-04-16 | 东方电气集团东方锅炉股份有限公司 | Three dimensional arrangement method and three dimensional arrangement heating surface for Power Station Boiler Heating Surface |
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| CN102322627B (en) | 2013-07-03 |
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