CN203309892U - Efficient and energy-saving circulating fluidized bed boiler - Google Patents

Abstract

The utility model discloses an efficient and energy-saving circulating fluidized bed boiler. A vertical upward flue (10) is arranged at the rear part of a vertical downward flue (9), an outlet of a hearth (5) is communicated with an inlet at the upper end of the vertical downward flue (9), a smokestack (3) for improving the tangential flow velocity of flue gas is arranged between the vertical downward flue (9) and the vertical upward flue (10), a high-temperature separator is arranged in the vertical upward flue (10), the upper end of an outlet of the vertical upward flue (10) is connected with a superheater (8), the lower parts of the vertical downward flue (9) and the vertical upward flue (10) are provided with an ash pit (1), and the ash pit (1) is provided with a material return port (2) communicated with the hearth (5). The efficient and energy-saving circulating fluidized bed boiler disclosed by the utility model has a good separation effect and high thermal efficiency, occupies a small area, and is convenient to maintain, low in manufacturing cost and suitable for old furnace reforming.

Description

A kind of high-efficiency energy-saving circulating fluidized-bed combustion boiler

Technical field

The utility model relates to a kind of boiler, particularly relates to a kind of band high-efficiency energy-saving circulating fluidized-bed combustion boiler.

Background technology

The thermal efficiency of CFBB is high, and coal adaptability is strong, and environment protecting is good, and the key technology of CFBB is that flying dust separates and send-back system.Although some boiler thermal outputs is high, separate the send-back system cost high, faults frequent, the producer made after newly upper or old furnace modification becomes fluidized-bed combustion boiler, falls flat, and has caused very large loss.CFBB generally all adopts separating at high temperature with middle temperature, to separate two kinds of forms at present.Separating at high temperature is that separator is placed on to furnace outlet, the cigarette temperature is 900 ℃ of left and right herein, the flying dust burning condition be returned to therefore separate in stove is abundant, the thermal efficiency is high, but separating at high temperature to the separator heat-resistant antifriction require highly, most of producers adopt the external separator of willy-willy cylinder, material requires high, maintenance workload is large, 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 by separator, the cigarette temperature is between 500 ℃～600 ℃ herein, therefore the flying dust burning condition separated is bad, but less demanding to the separator heat-resistant antifriction, therefore many producers are for the conservative operation of safety, adopt the separator of this form, so its boiler thermal output is not high.

Summary of the invention

It is high that technical problem to be solved in the utility model is to provide a kind of thermal efficiency, easy to maintenance, the high-efficiency energy-saving circulating fluidized-bed combustion boiler that cost is low.

In order to solve the problems of the technologies described above, the high-efficiency energy-saving circulating fluidized-bed combustion boiler that the utility model provides, vertically the rear portion of down pass is furnished with vertical updraught flue, the outlet of burner hearth is communicated with the upper end entrance of described vertical down pass, the smokestack that improves the tangential flow velocity of flue gas is arranged between described vertical down pass and described 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, described ash-pit is provided with the returning charge mouth be communicated with described burner hearth.

Described high-temperature separator is exhaust willy-willy cylinder on water-cooled.

Adopt the high-efficiency energy-saving circulating fluidized-bed combustion boiler of technique scheme, on water-cooled, exhaust willy-willy cylinder is a kind of high-temperature separator, the flying dust temperature separated is 900 ℃ of left and right, burning condition is better, adopts the difficult point that solves the high-temperature separator antiwear heat resisting from structure, good separating effect, the thermal efficiency is high, there is no plug-in willy-willy cylinder, the occupation of land position is few, is more suitable in old furnace modification.If use the 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 of burning required, therefore efficiency of combustion is than the fluidisation height of bed of general separating at high temperature.Because high-temperature separator is arranged in the vertical updraught flue in burner hearth, floor space is few, 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, and the thermal efficiency is high, take up an area position few, easy to maintenance, the CFBB with internal cyclone upper-exhausting high-temperature separator 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 especially existing chain furnace, coal-powder boiler etc. are transformed into the CFBB that uses inferior fuel (bone coal, spoil, slag etc.).

The accompanying drawing explanation

Fig. 1 is the utility model structural representation;

Fig. 2 is along A-A line cut-away view in 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, vertically the rear portion of down pass 9 is furnished with vertical updraught flue 10, the outlet of burner hearth 5 is communicated with the upper end entrance of vertical down pass 9, the smokestack 3 that improves the tangential flow velocity of flue gas is arranged between vertical down pass 9 and vertical updraught flue 10, vertically in updraught flue 10, be furnished with exhaust willy-willy cylinder 1 on water-cooled, vertically the outlet upper end of updraught flue 10 is connected with superheater 8, 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 be communicated with burner hearth 5.

Referring to Fig. 1 and Fig. 2, vertically the rear portion of down pass 9 is furnished with between vertical updraught flue 10, two flues the smokestack 3 that improves the tangential flow velocity of flue gas is set; In burner hearth 5 outlets, arrange vertical down pass 9, this flue is except changing flue gas flow direction, its flue-gas temperature of passing through is 900 ℃ of left and right, it itself is a burning chamber, producing simultaneously a part of fallout enters in ash-pit 4, thereby on the minimizing water-cooled, the separation of exhaust willy-willy cylinder 1 burden, reduce wear.Vertically in updraught flue 10, be furnished with exhaust willy-willy cylinder 1 on water-cooled, its flying dust separated enters ash-pit 1, after flue gas is up, enters the back-end surfaces of vertical updraught flue 10.Owing to adopting exhaust willy-willy cylinder 1 on water-cooled, heat resistance is improved.Because exhaust willy-willy cylinder 1 on water-cooled is arranged in the vertical updraught flue 10 in burner hearth 5, floor space is few, easy to maintenance, and 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 to ash-pit 4 adopts returning charge mouth 2 to return in burner hearth 5.Vertically down pass 9 and vertical updraught flue 10 itself are effective combustion spaces, have guaranteed the active combustion space of burning required, therefore efficiency of combustion is than the fluidisation height of bed of general separating at high temperature.

Claims (2)

1. high-efficiency energy-saving circulating fluidized-bed combustion boiler, it is characterized in that: vertically the rear portion of down pass (9) is furnished with vertical updraught flue (10), the outlet of burner hearth (5) is communicated with the upper end entrance of described vertical down pass (9), the smokestack (3) that improves the tangential flow velocity of flue gas is arranged between described vertical down pass (9) and described 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 (8), described vertical down pass (9) and vertical updraught flue (10) bottom are provided with ash-pit (1), described ash-pit (1) is provided with the returning charge mouth (2) be communicated with described burner hearth (5).

2. high-efficiency energy-saving circulating fluidized-bed combustion boiler according to claim 1, it is characterized in that: described high-temperature separator is exhaust willy-willy cylinder (1) on water-cooled.

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