CN2257008Y

CN2257008Y - Circulation fluidized bed boiler transformed by chain boiler

Info

Publication number: CN2257008Y
Application number: CN 96207497
Authority: CN
Inventors: 姜鸿安; 金坚; 孙涛; 周民; 张文华; 崔文勤
Original assignee: BEIJING UNIVERSAL ENERGY SOURC
Current assignee: BEIJING UNIVERSAL ENERGY SOURC
Priority date: 1996-04-08
Filing date: 1996-04-08
Publication date: 1997-06-25
Anticipated expiration: 2006-04-08

Abstract

The utility model relates to a circulation fluidization bed boiler transformed by a chain boiler, which comprises a fluidization chamber 5 composed of a blast cap 1, a wind-distribution plate 2, a blast box 3, a slag discharge pipe 4 and a boiler wall and two ash circulation devices, wherein the ash circulation device is composed of a primary inertia separator 9, a primary material return device 8, a secondary cyclone separator 12 and a secondary material return device 14, and the lower part of the fluidization chamber 5 is provided with a coal feeding opening 6. A louver outlet 18 of the fluidization chamber is connected with the secondary cyclone separator 12 through a curved pipe flue, ash of the secondary cyclone separator 12 enters the fluidization chamber 5 through the secondary material return device 14, and smoke gas passes through a coal economizer 15 and an air preheater 16 in a tail smoke channel 17 and is exhausted. The utility model has the advantages of low cost, heat efficiency of 86 percent, multiple applicable coal kinds and good desulfuration and denitrification.

Description

The CFBB that a kind of chain furnace is transformed

The utility model relates to boiler, specifically is the CFBB that a kind of chain furnace is transformed.

Energy savings, the protection environment has caused that countries in the world greatly pay close attention to.Fluidized-bed combustion boiler has advantages such as efficiency of combustion height, coal adaptability is wide, noxious gas emission concentration is low, and therefore, fluidized-bed combustion boiler is developed rapidly.At present, still there are a large amount of chain furnaces in China, and its efficiency of combustion is low, and energy waste is very serious.If these boilers are all eliminated, not only waste substantial contribution, equipment, and the cycle is very long, can directly influence industrial production and adopt dim.

The purpose of this utility model is low at mode chain furnace combustion efficient, the serious problem that wastes energy, the CFBB of being transformed by chain furnace that provides that a kind of efficiency of combustion height, coal adaptability are wide, noxious gas emission concentration is low.

The utility model is achieved in that the CFBB by the chain furnace transformation comprises fluidising chamber and two grey EGRs being made up of one-level inertia separator and one-level material returning device, secondary cyclone and secondary material returning device.Around the fluidising chamber is the furnace wall, and blast cap and slagging pipe are housed on the air distribution plate of bottom.The air distribution plate bottom is bellows.Exporting a side near fluidising chamber's smokestack is the one-level material returning device.Be provided with the one-level inertia separator before the smokestack outlet of one-level material returning device top.Drum is positioned at upper furnace.The fluidising chamber bottom is provided with coal feeding hole above the air distribution plate.The smokestack outlet of fluidising chamber links to each other with secondary cyclone by the turning flue.The lower end of secondary cyclone is connected with the secondary material returning device.Two utmost point material returning devices link to each other with fluidising chamber by pipeline.Secondary cyclone is through inverted U-shaped flue and back-end ductwork UNICOM.The vertical part of back-end ductwork, economizer is equipped with on top, and air preheater is equipped with in the bottom.

During work, coal is delivered to fluidising chamber by coal feeding hole, in fluidising chamber, burn by screw-type coal distributor.Elder generation was through the one-level inertia separator before the flue gas that burning produces entered chimney, and the separated ash of a part enters the one-level material returning device of bottom, returns fluidising chamber by the one-level returning charge, continued to participate in burning.Flue gas is discharged from smokestack, enters secondary cyclone through the turning flue.The ash that secondary cyclone separates returns fluidising chamber by the secondary material returning device through pipeline, and the flue gas after the separation enters back-end ductwork through inverted U-shaped flue.At the vertical flue part of back-end ductwork successively flow through economizer and air preheater, discharge from back-end ductwork at last.

Drum in the utility model, economizer, air preheater back-end ductwork are the existing parts of former chain furnace, and other are spare part in common use as blast cap, air distribution plate, scum pipe, bellows and one-level inertia separator, two utmost point cyclone separators, material returning device.Therefore, repack into lowly, the CFBB thermal efficiency after the repacking reaches more than 86%, and it is many to adapt to coal, and desulfurization, denitrification effect are good, the favorable environment protection.

Fig. 1 is a structural map of the present utility model;

Fig. 2 left side is the A-A cutaway view of Fig. 1, and the right side is the B-B cutaway view of Fig. 1.

The utility model is described in further detail below in conjunction with accompanying drawing:

As shown in the figure, comprise the grey EGR that grey EGR, secondary cyclone 12 and secondary material returning device 14 that fluidising chamber 5, one-level inertia separator 9 and one-level material returning device 8 constitute constitute by the CFBB of chain furnace transformation.Around the fluidising chamber is furnace wall 7, some blast caps 1 is housed on the air distribution plate 2 of bottom, and slagging pipe 4 is housed.Air distribution plate 2 bottoms formation bellows 3-exports 18 positions near fluidising chamber's smokestack an one-level inertia separator 9.One-level inertia separator 8 isolated ashes return fluidising chamber through one-level material returning device 8.Flue gas enters secondary cyclone 12 through turning flue 13.The ash that secondary cyclone 12 separates is back to fluidising chamber by secondary material returning device 14 through pipeline.Flue gas after the separation is through inverted U flue 11, and the economizer in back-end ductwork 15, air preheater 16 are discharged from back-end ductwork 17 again.Drum 10 is positioned at the top of fluidising chamber 5.

Claims

1, a kind of CFBB of chain furnace transformation is characterized in that comprising fluidising chamber and two grey EGRs being made up of one-level inertia separator and one-level material returning device, secondary cyclone and secondary material returning device; Around the fluidising chamber is the furnace wall, and blast cap and slagging pipe are housed on the air distribution plate of bottom; The air distribution plate bottom is bellows; Exporting a side near fluidising chamber's smokestack is the one-level material returning device; Be provided with the one-level inertia separator before the smokestack outlet of one-level material returning device top; Drum is positioned at upper furnace; The fluidising chamber bottom is provided with coal feeding hole above the air distribution plate; The smokestack outlet of fluidising chamber links to each other with secondary cyclone by the turning flue; Two utmost point material returning devices link to each other with fluidising chamber by pipeline; Secondary cyclone is through inverted U-shaped flue and back-end ductwork UNICOM; Economizer is equipped with on the vertical part top of back-end ductwork, and air preheater is equipped with in the bottom.