CN201521950U

CN201521950U - Circulating fluidized bed boiler provided with internal cyclone upper-exhausting high-temperature separator

Info

Publication number: CN201521950U
Application number: CN2009203122113U
Authority: CN
Inventors: 蒋卫东
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-10-10
Filing date: 2009-10-10
Publication date: 2010-07-07
Anticipated expiration: 2019-10-10

Abstract

The utility model discloses a circulating fluidized bed boiler provided with an internal cyclone upper-exhausting high-temperature separator; an outlet of a hearth (8) is communicated with an upper end inlet of a vertical downstream flue (9); the rear part of the vertical downstream flue (9) is distributed with a vertical upstream flue (10); a smokestack (3) used for accelerating the tangential flow velocity of flue gas is positioned between the vertical downstream flue (9) and the vertical upstream flue (10); the vertical upstream flue (10) is internally provided with a high-temperature separator; the upper end of an outlet of the vertical upstream flue (10) is connected with a superheater (5); ash chutes (1) are arranged at the lower parts of the vertical downstream flue (9) and the vertical upstream flue (10); the ash chutes (1) are provided with material returning holes (2) communicated with the hearth (8); and the high-temperature separator is a water-cooling upper-exhausting big cyclone cylinder (4). The circulating fluidized bed boiler has good separating effect, high thermal efficiency, small land occupying area, convenient maintenance and low manufacturing cost, and is suitable for reforming the old boilers.

Description

CFBB with exhaust high temperature separator on the built-in whirlwind

Technical field

The utility model relates to a kind of boiler, particularly relates to a kind of CFBB with exhaust high temperature separator on the built-in whirlwind.

Background technology

China's CFBB technology has entered to developing stage, and various types of CFBBs are fed in the practice.CFBB is with its thermal efficiency height, and coal adaptability is strong, and environment protecting is good and accepted by users.

The key technology of CFBB is that flying dust separates and send-back system.Does good and bad uneven, what the thermal efficiency was high reach 85% because the mode difference that flying dust separates and send-back system is selected causes CFBB factions to be stood in great numbers, and is of a great variety? 0%, low about 60%.Though the boiler thermal output that has is high, separate send-back system cost height, fault is frequent, makes the producer that has newly go up or after old furnace modification becomes fluidized-bed combustion boiler, falls flat, and has caused very big loss.

CFBB generally all adopts the high temperature separation to separate two kinds of forms with middle temperature at present.It is that separator is placed on furnace outlet that high temperature separates, the cigarette temperature is about 900 ℃ herein, so it is abundant to separate the flying dust burning condition that is returned in the stove, thermal efficiency height, but high temperature separates the requirement height to the separator heat-resistant antifriction, and most of producers adopt the external separator of willy-willy tube, material requires high, maintenance workload is big, and the occupation of land position is many, and is not suitable for the transformation of old stove.Before middle temperature separation generally is placed on economizer with separator, is the cigarette temperature at 500 ℃ herein? between 00 ℃, so the flying dust burning condition that separates is bad, but less demanding to the separator heat-resistant antifriction, so many producers are for the conservative operation of safety, adopt the separator of this form, so its boiler thermal output is not high.

The utility model content

Technical problem to be solved in the utility model provides a kind of good separating effect, thermal efficiency height, and the occupation of land position is few, easy to maintenance, the CFBB with exhaust high temperature separator on the built-in whirlwind that cost is low.

In order to solve the problems of the technologies described above, the CFBB that the utility model provides with exhaust high temperature separator on the built-in whirlwind, comprise burner hearth and superheater, the outlet of described burner hearth is communicated with the last end entrance of vertical down pass, the rear portion of described vertical down pass is furnished with vertical updraught flue, be provided with the smokestack that improves the tangential flow velocity of flue gas between described vertical down pass and the vertical updraught flue, in described vertical updraught flue, be furnished with high-temperature separator, the outlet upper end of described vertical updraught flue is connected with described superheater, described vertical down pass and vertical updraught flue bottom are provided with ash-pit, and described ash-pit is provided with the returning charge mouth that is communicated with described burner hearth.

Described high-temperature separator is an exhaust willy-willy tube on the water-cooled.

Adopt the CFBB with exhaust high temperature separator on the built-in whirlwind of technique scheme, because the outlet at burner hearth is connected with vertical down pass and vertical updraught flue, vertically be furnished with exhaust willy-willy tube on the water-cooled in the updraught flue, exhaust willy-willy tube is a kind of high-temperature separator on the water-cooled, the flying dust temperature that separates is about 900 ℃, burning condition is better, employing solves the difficult point of high-temperature separator antiwear heat resisting from structure, good separating effect, thermal efficiency height, do not have plug-in willy-willy tube, the occupation of land position is few, is more suitable in old furnace modification.If use inferior fuels such as spoil, bone coal, burner hearth internal heating surface, vertical down pass and vertical updraught flue all lay with castable refractory, to improve flue-gas temperature, guarantee fuel combustion.Vertically down pass and vertical updraught flue itself are effective combustion spaces, have guaranteed the active combustion space (in fact can roll over and be the required time of flying dust after-flame) of burning required, so the fluidisation height of bed that efficiency of combustion is separated than general high temperature.Because high-temperature separator is arranged in the interior vertical updraught flue of burner hearth, floor space is few, and is easy to maintenance, and cost is low, and is adapted to old furnace modification.

In sum, the utility model is a kind of good separating effect, thermal efficiency height, it is few, easy to maintenance to take up an area of the position, the CFBB with exhaust high temperature separator on the built-in whirlwind that cost is low, be adapted to old furnace modification, be applicable to the following Industrial Boiler of 130t/h, station boiler.Be adapted to existing chain furnace especially, coal-powder boiler etc. are transformed into the CFBB that uses inferior fuel (bone coal, spoil, slag etc.).

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is along A-A line cut-away view among Fig. 1.

The specific embodiment

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Referring to Fig. 1 and Fig. 2, the outlet of burner hearth 8 is communicated with the last end entrance of vertical down pass 9, vertically the rear portion of down pass 9 is furnished with vertical updraught flue 10, vertically be provided with the smokestack 3 that improves the tangential flow velocity of flue gas between down pass 9 and the vertical updraught flue 10, vertically be furnished with exhaust willy-willy tube 4 on the water-cooled in the updraught flue 10, vertically the outlet of updraught flue 10 upper end is connected with superheater 5, be connected with economizer 6 and air preheater 7 behind the superheater 5, vertically down pass 9 and vertical updraught flue 10 bottoms are provided with ash-pit 1, and ash-pit 1 is provided with the returning charge mouth 2 that is communicated with burner hearth 8.

Referring to Fig. 1 and Fig. 2, arrange vertical down pass 9 in burner hearth 8 outlets, this flue is except changing flue gas flow direction, its flue-gas temperature of passing through is about 900 ℃, it itself is a burning chamber, produce a part of fallout simultaneously and enter in the ash-pit 1, thereby the separation burden of exhaust willy-willy tube 4 on the minimizing water-cooled reduces wear; Vertically the rear portion of down pass 9 is furnished with the smokestack 3 that improves the tangential flow velocity of flue gas is set between vertical updraught flue 10, two flues.Vertically be furnished with exhaust willy-willy tube 4 on the water-cooled in the updraught flue 10, its flying dust that separates enters ash-pit 1, enters the back-end surfaces of vertical updraught flue 10 after flue gas is up.Owing to adopt exhaust willy-willy tube 4 water-cooleds on the water-cooled, heat resistance is improved.If use inferior fuels such as spoil, bone coal, burner hearth 8 internal heating surfaces, vertical down pass 9 and vertical updraught flue 10 all lay with castable refractory, to improve flue-gas temperature, guarantee fuel combustion.Since cylinder----on the water-cooled exhaust willy-willy tube 4 be arranged in the vertical updraught flue 10 in the burner hearth 8, floor space is few, and is easy to maintenance, cost is low, and is adapted to old furnace modification.The flying dust that vertical down pass 9 and vertical updraught flue 10 is entered ash-pit 1 adopts returning charge mouth 2 to return in the burner hearth 8.Vertically down pass 9 and vertical updraught flue 10 itself are effective combustion spaces, have guaranteed the active combustion space (in fact can roll over and be the required time of flying dust after-flame) of burning required, so the fluidisation height of bed that efficiency of combustion is separated than general high temperature.

Claims

1. CFBB with exhaust high temperature separator on the built-in whirlwind, comprise burner hearth (8) and superheater (5), it is characterized in that: the outlet of described burner hearth (8) is communicated with the last end entrance of vertical down pass (9), the rear portion of described vertical down pass (9) is furnished with vertical updraught flue (10), be provided with the smokestack (3) that improves the tangential flow velocity of flue gas between described vertical down pass (9) and the vertical updraught flue (10), in described vertical updraught flue (10), be furnished with high-temperature separator, the outlet upper end of described vertical updraught flue (10) is connected with described superheater (5), described vertical down pass (9) and vertical updraught flue (10) bottom are provided with ash-pit (1), and described ash-pit (1) is provided with the returning charge mouth (2) that is communicated with described burner hearth (8).

2. the CFBB with exhaust high temperature separator on the built-in whirlwind according to claim 1 is characterized in that: described high-temperature separator is an exhaust willy-willy tube (4) on the water-cooled.