CN103363516B - A kind of CFBB with double reheat - Google Patents
A kind of CFBB with double reheat Download PDFInfo
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- CN103363516B CN103363516B CN201310329406.XA CN201310329406A CN103363516B CN 103363516 B CN103363516 B CN 103363516B CN 201310329406 A CN201310329406 A CN 201310329406A CN 103363516 B CN103363516 B CN 103363516B
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- temperature reheater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
- F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/0007—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed
- F22B31/0015—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed for boilers of the water tube type
- F22B31/003—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed for boilers of the water tube type with tubes surrounding the bed or with water tube wall partitions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/0007—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed
- F22B31/0084—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed with recirculation of separated solids or with cooling of the bed particles outside the combustion bed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
- F23C10/08—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
- F23C10/10—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the combustion chamber
Abstract
The invention discloses a kind of CFBB with double reheat, comprise air compartment, air-distribution device, burner hearth, primary air system, secondary air system, horizontal flue, several cyclone separators and outer heat exchanger, back-end ductwork, the shrinkage ratio of lower furnace portion is 0.2-0.49; Establish gas baffle in back-end ductwork, back-end ductwork comprises at least two parallel flues, in a parallel flue, be provided with low temperature superheater, is provided with a low-temperature reheater in another parallel flue; In at least one outer heat exchanger, be provided with medium temperature overheater, at least one outer heat exchanger, be provided with a high temperature reheater, at least one outer heat exchanger, be provided with secondary low-temperature reheater and secondary high-temperature reheater; High temperature superheater is provided with in upper furnace; The present invention can effectively improve furnace heat transfer intensity, and coordinate preferred heating surface arrangement to be effectively combined with CFBB to realize double reheat, thus reach and improve coal group of motors generating efficiency and low stain thing and discharge the object coexisted, the long-term Effec-tive Function of guarantee equipment.
Description
Technical field
The present invention relates to a kind of CFBB, the CFBB particularly with double reheat.
Background technology
China has now become world-class production of energy state and country of consumption, and nearly ten years coal proportion in energy resource structure, always about 70%, and is estimated to continue to the middle of this century.But, in coal resources in China, high-sulfur higher with colm proportion that is ash-rich, for this reason, improve unit generation efficiency, reduce the central task that pollutant emission is power industry.
Combustion technology of circulating fluidized be within nearly 30 years, grow up present stage uniquely realize commercialization and maximization low-grade fuel high-efficiency cleaning burning utilize technology, with its impayable low stain thing discharge advantage, efficiently solve problem that is energy-conservation and environmental protection two aspect, represent a much progress of current combustion technology.
At present, improving steam parameter, increasing reheating number of times is the effective ways improving unit generation efficiency, but CFBB runs into larger difficulty further raising in unit generation efficiency.This is because, CFBB is under rated load, in stove, normal combustion temperature is no more than 930 DEG C usually, relative to other combustion system as the boiler such as pulverized-coal fired boiler or cyclone-combustion stove, its ignition temperature is on the low side, in addition the problem of high parameter heating surface metal material, causes running into larger bottleneck further raising in steam parameter; If increase reheating number of times, then need the position considering heating surface, pulverized-coal fired boiler has the precedent be arranged in by double reheat heating surface in the higher furnace outlet horizontal flue of cigarette temperature, but due to the difference in Gas-solid Two-phase Flow, the furnace outlet place flue gas of CFBB carries a large amount of solid particles, and velocity of flue gas can up to about 30m/s, if double reheat heating surface is arranged in this region, its wearing and tearing are inevitable serious, make boiler be difficult to safe operation; As being entirely arranged in back-end ductwork by secondary reheater, then owing to also arranging other heating surface in back-end ductwork, the Heat absorption fraction of each heating surface is difficult to adjusted in concert, is difficult to arrange on temperature regulates.In addition, what is more important, double reheat vapour pressure ratio single reheat steam pressure is lower, unlikely excessive for making double reheat steam pressure lose, and needs to adopt lower steam flow rate, but, lower steam speed also makes steam very limited to the cooling capacity of heating surface tube wall, and namely heating surface pipe wall temperature is closer to the temperature of the outer medium of pipe, therefore for considering the thermal bearing capacity of heating surface pipe, that steam flow rate can not be got again is too low, and the two is difficult to balance; Meanwhile, in boiler startup process, being the unlikely overtemperature dry combustion method of protection reheater, often adopting as introduced the method protection reheaters such as main steam cooling.The introducing of secondary reheater adds reheating heating surface area, the Heat absorption fraction of reheater the is exceeded Heat absorption fraction of superheater, when taking main steam to cool, will need more quantity of steam, namely original quantity of steam is difficult to meet protection single reheat device and secondary reheater simultaneously; Below all limit the combination of double reheat and Combustion technology of circulating fluidized, make the further raising of Circulating Fluidized Bed Boilers efficiency be difficult to realize.
Summary of the invention
The object of the invention is for prior art above shortcomings and overcome the difficult point that above-mentioned double reheat combines with CFBB, a kind of CFBB with double reheat is provided, it can effectively improve furnace heat transfer intensity and heat utilization ratio when significantly not increasing fuel, thus realize effective combination of double reheat and CFBB, reach raising coal group of motors generating efficiency and low stain thing further and discharge the object coexisted, and the long-term Effec-tive Function of the equipment of guarantee.
For achieving the above object, a kind of CFBB with double reheat of the present invention, comprise air compartment, comprise the air-distribution device of air distribution plate and blast cap, burner hearth, primary air system, secondary air system, horizontal flue, at least three cyclone separators, at least three outer heat exchangers, back-end ductworks, be provided with the water-cooling wall being with upper and lower header in burner hearth, it is characterized in that described lower furnace portion is 0.2-0.49 along the shrinkage ratio of depth direction; Described back-end ductwork adopts parallel Multi-flue structure, at least comprise two parallel flues, gas proportioning damper is provided with in every bar flue, gas proportioning damper at least one parallel flue was provided with low temperature superheater before flow of flue gas direction, gas proportioning damper at least another parallel flue was provided with a low-temperature reheater before flow of flue gas direction, arranged economizer and air preheater at all gas baffles along in the back-end ductwork after flow of flue gas direction; Medium temperature overheater is provided with at least one outer heat exchanger, a high temperature reheater is provided with at least one outer heat exchanger, in at least one outer heat exchanger, be provided with secondary low-temperature reheater, at least one outer heat exchanger, be provided with secondary high-temperature reheater; High temperature superheater is provided with in stove; The upper collecting chamber of water-cooling wall, low temperature superheater, medium temperature overheater are communicated with by pipeline successively with high temperature superheater, and a low-temperature reheater and a high temperature reheater are by pipeline connection, and secondary low-temperature reheater and secondary high-temperature reheater pass through pipeline connection.
Above-mentioned burner hearth can be single burner hearth, and its underpart is provided with an air distribution plate, and air distribution plate is provided with several blast cap.
Above-mentioned burner hearth also can adopt the two air distributor structure of single burner hearth, and its underpart is provided with two air distribution plates, and every block air distribution plate is provided with several blast cap.
Above-mentioned burner hearth also can be annular furnace, and its underpart is provided with the air distribution plate of annular, and this air distribution plate is provided with several blast cap.
During use, the Boiler Steam of existing certain degree of superheat from water-cooling wall out after flow through low temperature superheater, medium temperature overheater and high temperature superheater successively, enter steam turbine high-pressure cylinder acting; The acting of steam turbine first intermediate pressure cylinder is entered after steam turbine high-pressure cylinder steam out flows through a low-temperature reheater and a high temperature reheater successively; Flow through again secondary low-temperature reheater and secondary high-temperature reheater successively from steam turbine first intermediate pressure cylinder steam out, enter steam turbine second intermediate pressure cylinder and turbine low pressure cylinder acting afterwards successively;
For realizing effective combination of double reheat and Combustion technology of circulating fluidized, the aspect factors such as the adjustment of heat-transfer intensity, heating surface position, steam temperature and heating surface protection need be considered:
In furnace heat transfer, for CFBB, because the power of support fuel and bed material particle is from fan pressure head, the energy consumption saving that at least can not exceed double reheat system for making the increment of fan energy consumption unit efficiency is improved, therefore needs granule density to maintain reasonable level.0.5-0.7 is generally compared to the shrinkage ratio of current boiler hearth of circulating fluidized bed lower furnace depth direction, the shrinkage ratio of lower furnace portion along depth direction controls to be 0.2-0.49 by the present invention, under primary air fan and overfire air fan pressure head change little condition, to the endocorpuscular towing of stove and entrainment stronger, the granule density in upper furnace region can be improved, thus increase the convection heat transfer' heat-transfer by convection intensity of upper furnace region Dual-Phrase Distribution of Gas olid, carbonated drink side draught heat is improved, meets the needs that double reheat heating surface introduces CFBB.And large shrinkage ratio structure to make primary air flow account for total blast volume share less, it is larger that secondary air flow accounts for total blast volume share, and the air quantity for Secondary Air regulates and provides well-to-do adjustable range.
In heating surface layout, low temperature superheater and low-temperature reheater are all located at gas baffle along in the parallel flue before flow of flue gas direction, and relative to burner hearth, granule density is low herein, therefore heat-transfer intensity and heating surface wear degree are also lower than in stove, can reduce steel grade.Like this, both saved material cost, and avoided again in stove, arrange too much heating surface and the situation that significantly to drag down in stove local flue-gas temperature occurs, below local cigarette temperature drop to fuel ignition point can be prevented and be unfavorable for that the phenomenon of fuel after-flame occurs; Medium temperature overheater, high temperature reheater, secondary low-temperature reheater and a secondary high-temperature reheater are all arranged in outer heat exchanger, external heat exchanger makes heating surface pipe temperature closer to particle temperature due to the high heat transfer strength characteristics of its interior bubble fluid bed, and in the high heat transfer intensity in composite burner and outer heat exchanger, the high heat transfer strength characteristics of bubbling fluidized bed will meet the steam parameter needs that can realize double reheat.
In steam temperature adjustment, by regulating the aperture of each group of gas proportioning damper and the acting in conjunction passing in and out outer heat exchanger different temperatures ash flow proportional, the vapor (steam) temperature of superheater, single reheat device and secondary reheater is independently regulated, heating surface steam parameter at different levels is guaranteed while, do not reduce unit efficiency, ensure that again economizer and air preheater normally work; In addition, secondary low-temperature reheater and secondary high-temperature reheater are arranged in outer heat exchanger, the steam that can greatly facilitate secondary reheater at different levels switches, to run at boiler at low load and can available protecting secondary reheater heating surface in shutdown process, avoid the dry combustion method of secondary reheater, ensure the normal operation of equipment;
As a further improvement on the present invention, at least large than the ips of the secondary low-temperature reheater 1.7mm of the ips of described secondary high-temperature reheater; This is because double reheat vapour pressure ratio single reheat steam pressure is lower, unlikely excessive for making double reheat steam pressure lose, need to adopt lower steam flow rate.But lower steam speed also makes steam very limited to the cooling capacity of heating surface tube wall, and namely heating surface pipe wall temperature is closer to the temperature of the outer medium of pipe, therefore for considering the thermal bearing capacity of heating surface pipe, that steam flow rate can not be got again is too low.Can bear the many factors such as exchange capability of heat by adjusting environment temperature and pipe residing for the pressure loss of heating surface intraductal working medium and pipe, as above requirement is done to the ips of secondary reheater, make the steam flow rate at two places have comparatively significant difference, the needs of two aspects can be met simultaneously.
The present invention can realize effective combination of double reheat and CFBB, on the basis of existing large circulating fluidized bed boiler, unit efficiency can be improved 1.5%-2% again;
As a further improvement on the present invention, described high temperature superheater can be U-shaped pendant superheater; Be convenient to the flue gas heat exchange of the burner hearth central area higher with temperature, improve heat exchange efficiency;
In sum, the present invention can effectively improve furnace heat transfer intensity when significantly not increasing fuel, and coordinate preferred heating surface arrangement to be effectively combined with CFBB to realize double reheat, thus reach and improve coal group of motors generating efficiency and low stain thing and discharge the object coexisted, and the long-term Effec-tive Function of guarantee equipment.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention one.
Fig. 2 is the structural representation of the embodiment of the present invention two.
Fig. 3 is the left view of Fig. 2.
Fig. 4 is the plan structure schematic diagram of the embodiment of the present invention three.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
Embodiment one
As shown in Figure 1, this embodiment is the CFBB of band double reheat, comprise air compartment 14, single burner hearth 11, be provided with the air-distribution device of single air distribution plate 15 and several blast cap (not shown), be provided with the primary air system of blower fan 16 and airduct, be provided with the secondary air system of blower fan 17 and airduct, horizontal flue 18, three cyclone separators 1, three outer heat exchangers 2, back-end ductwork 3, cyclone separator 1 connects horizontal flue 18, the bottom of back-end ductwork 3 and burner hearth 11, the two ends of three outer heat exchangers 2 are connected with the bottom of burner hearth 11 with respective cyclone separator 1 respectively, the surrounding of burner hearth 11 and furnace roof are by bringing, the water-cooling wall 19 of lower header forms, described burner hearth 11 bottom is 0.3 along the shrinkage ratio (i.e. L1/L2 in figure) of depth direction, three groups of gas baffles 12 are provided with in described back-end ductwork 3, gas baffle 12 comprises three parallel flues 20 along the back-end ductwork 3 before flow of flue gas direction, economizer 13 and air preheater 21 is provided with along in the back-end ductwork 3 after flow of flue gas direction at gas baffle 12, low temperature superheater 4 is provided with in a parallel flue 20, in another parallel flue 20, be provided with a low-temperature reheater 7, in remaining parallel flue 20, be provided with other heating surfaces, in an outer heat exchanger 2, be provided with medium temperature overheater 5, in another outer heat exchanger 2, be provided with a high temperature reheater 8, in another outer heat exchanger 2, be provided with secondary low-temperature reheater 9 and secondary high-temperature reheater 10, high temperature superheater 6 is provided with in burner hearth 11, the upper collecting chamber of water-cooling wall 19, low temperature superheater 4, medium temperature overheater 5 are communicated with by pipeline successively with high temperature superheater 6, a low-temperature reheater 7 and a high temperature reheater 8 pass through pipeline connection, secondary low-temperature reheater 9 and secondary high-temperature reheater 10 pass through pipeline connection, the ips that secondary low-temperature reheater 9 adopts is 48mm, and the ips that secondary high-temperature reheater 10 adopts is 52.5mm.
During use, the Boiler Steam of existing certain degree of superheat from water-cooling wall 19 out after flow through low temperature superheater 4, medium temperature overheater 5 and high temperature superheater 6 successively, enter steam turbine high-pressure cylinder acting; The acting of steam turbine first intermediate pressure cylinder is entered after steam turbine high-pressure cylinder steam out flows through a low-temperature reheater 7 and a high temperature reheater 8 successively; Flow through again secondary low-temperature reheater 9 and secondary high-temperature reheater 10 successively from steam turbine first intermediate pressure cylinder steam out, enter steam turbine second intermediate pressure cylinder and turbine low pressure cylinder acting afterwards successively;
Boiler hearth of circulating fluidized bed endoparticle pulled by gas and, theoretical and facts have proved according to fluidization, blast needed for burner hearth is approximately equal to stove endoparticle weight, the stock namely in unit are, available pressure unit representation, and calculate by this regions particulate concentration.For CFBB, furnace heat transfer is mainly the convection heat transfer' heat-transfer by convection between gas-particle two-phase fluid and heating surface, and this convection heat transfer' heat-transfer by convection is relevant with concentration of solid particles, and concentration of solid particles is higher, and heat-transfer effect is better, and heat-transfer intensity is higher.The present invention adds due to double reheat heating surface, and total heat output increases, and therefore need to ensure heat-transfer intensity higher in stove, namely upper furnace region needs higher granule density; Simultaneously because the power of support material is from fan pressure head, and be the energy consumption saving making the increment of fan energy consumption at least can not exceed double reheat system unit efficiency is improved, therefore need granule density to maintain reasonable level.
Be 0.5-0.7 compared to the shrinkage ratio of current boiler hearth of circulating fluidized bed bottom, the present embodiment lower furnace portion is 0.3 along the shrinkage ratio of depth direction, two blower fans 16 can be made, 17 under pressure head changes little condition, more obvious to burner hearth 11 endocorpuscular towing effect, the granule density in upper furnace region can be significantly improved when real work, the ratio (usually between 0.2 ~ 0.5) of the pressure drop of furnace outlet area unit height and burner hearth mean unit height pressure drop (ratio of bed pressure drop and furnace height) is improved about 0.1 again, thus the heat-transfer intensity added in stove, the needs that double reheat heating surface is arranged can be met.
Low temperature superheater 4 and low-temperature reheater 7 are all located at gas baffle 12 along in the parallel flue 20 before flow of flue gas direction, relative to burner hearth 11, granule density is low herein, and therefore heat-transfer intensity and heating surface wear degree are also lower than in stove, can reduce steel grade.Like this, both saved material cost, and avoided again in stove, arrange too much heating surface and the situation that significantly to drag down in stove local flue-gas temperature occurs, and below local cigarette temperature drop to fuel ignition point can be prevented and be unfavorable for that the phenomenon of fuel after-flame occurs; Medium temperature overheater 5, high temperature reheater 8, secondary low-temperature reheater 9 and a secondary high-temperature reheater 10 are all located in outer heat exchanger 2, and in the high heat transfer intensity in composite burner and outer heat exchanger 2, the high heat transfer strength characteristics of bubbling fluidized bed will meet the steam parameter needs that can realize double reheat.
By regulating the aperture of each group of gas baffle 12, the exhaust gas volumn of adjustable each parallel flue 20, thus regulate the Heat absorption fraction of low temperature superheater 4, low-temperature reheater 7, by the vapor (steam) temperature regulating the solid particle flow entering different temperatures in outer heat exchanger 2 can regulate secondary reheater, thus the steam temperature of different heating surface is all independently regulated, namely, heating surface steam parameter at different levels is guaranteed while, unit efficiency is not reduced.Secondary low-temperature reheater 9 and secondary high-temperature reheater 10 are arranged in outer heat exchanger 2, the steam that can greatly facilitate secondary reheater system switches, run and available protecting secondary reheater heating surface in shutdown process at boiler at low load, avoid the dry combustion method of secondary reheater, ensure the normal operation of equipment; The secondary low-temperature reheater 9 that internal diameter is less makes steam flow rate higher, can the temperature of this region heating surface pipe of effective cooling, in the secondary high-temperature reheater 10 that internal diameter is larger, steam flow rate is slower, the loss of the steam pressure of secondary reheater can be made to maintain very low level, thus the pressure and temperature of double reheat steam is ensured all to some extent.Compared with the single reheat Circulating Fluidized Bed Boilers of same steam parameter, the present invention introduces double reheat can improve 1.5%-2% again by unit efficiency;
Embodiment two
As Fig. 2, shown in Fig. 3, this embodiment is compared with embodiment one, its difference is only: its burner hearth 26 is the two air distributor structure of single burner hearth, bottom is provided with two air distribution plates 22, two air distribution plates 22 are respectively provided with several blast cap (not shown), described burner hearth 26 bottom is 0.20 along the shrinkage ratio (i.e. L3/L4 in figure) of depth direction, three cyclone separators 1 and three outer heat exchangers 2 are respectively provided with in burner hearth 26 both sides, medium temperature overheater 5 is provided with in two outer heat exchangers 2 wherein, a high temperature reheater 8 is provided with in another two outer heat exchangers 2, secondary low-temperature reheater 9 is provided with in another outer heat exchanger 2, secondary high-temperature reheater 10 is provided with in another outer heat exchanger 2, the ips that secondary low-temperature reheater 9 adopts is 46mm, and the ips that secondary high-temperature reheater 10 adopts is 48mm.
Operation principle and the embodiment one of the present embodiment are similar, burner hearth 26 bottom is 0.2 along the shrinkage ratio of depth direction, the ratio (usually between 0.2 ~ 0.5) of the pressure drop of furnace outlet area unit height and burner hearth mean unit height pressure drop (ratio of bed pressure drop and furnace height) is improved about 0.13 again, thus realize the CFBB that double reheat plants chamber structure therewith and effectively combine, reach and improve coal group of motors generating efficiency and low stain thing and discharge the object coexisted, and the long-term Effec-tive Function of guarantee equipment.
Embodiment three
As shown in Figure 4, this embodiment is compared with embodiment two, and its difference is only: burner hearth 27 is annular furnace, and its underpart is provided with the air distribution plate of annular, and this air distribution plate is provided with several blast cap; Described burner hearth 27 bottom is 0.49 along the shrinkage ratio (i.e. L5/L6 in figure) of depth direction, the ratio (usually between 0.2 ~ 0.5) of the pressure drop of furnace outlet area unit height and burner hearth mean unit height pressure drop (ratio of bed pressure drop and furnace height) is improved about 0.06 again, thus the heat-transfer intensity added in stove, the needs of double reheat heating surface can be met.Six cyclone separators 1 and six outer heat exchangers 2 are provided with around burner hearth 27;
In sum, the present invention is by changing the shrinkage ratio of lower furnace portion along depth direction, improve the granule density in upper furnace region to rational level, the ratio (usually between 0.2 ~ 0.5) of the pressure drop of furnace outlet area unit height and burner hearth mean unit height pressure drop (ratio of bed pressure drop and furnace height) is improved about 0.05 ~ 0.15 again, furnace heat transfer intensity can be effectively improved when not increasing fuel, and coordinate the relation of preferred heating surface arrangement and secondary reheater ips at different levels to realize effective combination of double reheat and CFBB, thus reach and improve coal group of motors generating efficiency and low stain thing and discharge the object coexisted, and the long-term Effec-tive Function of the equipment of guarantee.
Claims (6)
1. the CFBB with double reheat, comprise air compartment, comprise the air-distribution device of air distribution plate and blast cap, burner hearth, primary air system, secondary air system, horizontal flue, at least three cyclone separators, at least three outer heat exchangers, back-end ductworks, be provided with the water-cooling wall being with upper and lower header in burner hearth, it is characterized in that described lower furnace portion is 0.2-0.49 along the shrinkage ratio of depth direction; Described back-end ductwork adopts parallel Multi-flue structure, at least comprise two parallel flues, gas proportioning damper is provided with in every bar flue, gas proportioning damper at least one parallel flue was provided with low temperature superheater before flow of flue gas direction, gas proportioning damper at least another parallel flue was provided with a low-temperature reheater before flow of flue gas direction, arranged economizer and air preheater at all gas baffles along in the back-end ductwork after flow of flue gas direction; Medium temperature overheater is provided with at least one outer heat exchanger, a high temperature reheater is provided with at least one outer heat exchanger, in at least one outer heat exchanger, be provided with secondary low-temperature reheater, at least one outer heat exchanger, be provided with secondary high-temperature reheater; High temperature superheater is provided with in stove; The upper collecting chamber of water-cooling wall, low temperature superheater, medium temperature overheater are communicated with by pipeline successively with high temperature superheater, and a low-temperature reheater and a high temperature reheater are by pipeline connection, and secondary low-temperature reheater and secondary high-temperature reheater pass through pipeline connection.
2. a kind of CFBB with double reheat as claimed in claim 1, it is characterized in that described burner hearth is single burner hearth list air distributor structure, its underpart is provided with an air distribution plate, and air distribution plate is provided with several blast cap.
3. a kind of CFBB with double reheat as claimed in claim 1, it is characterized in that described burner hearth adopts the two air distributor structure of single burner hearth, its underpart is provided with two air distribution plates, and every block air distribution plate is provided with several blast cap.
4. a kind of CFBB with double reheat as claimed in claim 1, is characterized in that described burner hearth is annular furnace, and its underpart is provided with the air distribution plate of annular, and this air distribution plate is provided with several blast cap.
5. a kind of CFBB with double reheat as described in as arbitrary in Claims 1-4, is characterized in that the ips of described secondary high-temperature reheater is at least greater than the ips 1.7mm of secondary low-temperature reheater.
6. a kind of CFBB with double reheat as claimed in claim 5, is characterized in that described high temperature superheater is U-shaped pendant superheater.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310329406.XA CN103363516B (en) | 2013-08-01 | 2013-08-01 | A kind of CFBB with double reheat |
| PCT/CN2014/082913 WO2015014233A1 (en) | 2013-08-01 | 2014-07-24 | Circulating fluidized bed boiler having secondary reheat |
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| CN201310329406.XA CN103363516B (en) | 2013-08-01 | 2013-08-01 | A kind of CFBB with double reheat |
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| CN103363516A CN103363516A (en) | 2013-10-23 |
| CN103363516B true CN103363516B (en) | 2015-10-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103363516B (en) * | 2013-08-01 | 2015-10-28 | 东方电气集团东方锅炉股份有限公司 | A kind of CFBB with double reheat |
| CN104501142A (en) * | 2014-12-23 | 2015-04-08 | 哈尔滨锅炉厂有限责任公司 | Secondary re-heating device and re-heating method for circulating fluidized bed boiler |
| CN104728823B (en) * | 2015-03-17 | 2016-08-03 | 西安热工研究院有限公司 | A kind of Novel supercritical carbon dioxide coal-burning boiler |
| CN106224942B (en) * | 2016-08-24 | 2018-09-14 | 东方电气集团东方锅炉股份有限公司 | 1000MW ultra supercritical parameter circulating fluidized bed boiler |
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| CN103363516A (en) | 2013-10-23 |
| WO2015014233A1 (en) | 2015-02-05 |
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