CN202267056U

CN202267056U - Circulating fluidized bed boiler

Info

Publication number: CN202267056U
Application number: CN2011202966583U
Authority: CN
Inventors: 孙建涛; 潘宇峰; 陈弘; 田忠权
Original assignee: Jiangsu Taihu Boiler Co Ltd
Current assignee: Jiangsu Taihu Boiler Co Ltd
Priority date: 2011-08-16
Filing date: 2011-08-16
Publication date: 2012-06-06
Anticipated expiration: 2021-08-16

Abstract

The utility model provides a circulating fluidized bed boiler, which can keep accumulated ash at the rear part of the boiler to a small degree so as to ensure the normal use of the boiler. The circulating fluidized bed boiler includes a boiler drum, a combustion chamber, an evaporation heating surface, an superheater, a coal economizer, an air pre-heater, and a tail part flue, wherein the boiler drum is mounted above the combustion chamber; the superheater, the evaporation heating surface, the coal economizer, the air pre-heater and the tail part flue are sequentially mounted in the combustion chamber in the flow direction of the fume. The circulating fluidized bed boiler is characterized in that the fume in the combustion chamber rises and sequentially flows into a horizontal flue and a turning flue, and then flows into a tail part vertical flue; a cyclone separator is arranged below the horizontal flue, and a suction inlet of the cyclone separator faces to the horizontal flue; an exhaust outlet of the cyclone separator at the lower part is connected with a returning charge passage communicated with the lower part of the combustion chamber; the evaporation heating surface particularly adopts a W-shaped cross section; the superheater, the W-shaped structured evaporation heating surface, the coal economizer and the air pre-heater are sequentially connected and arranged in the tail part vertical flue.

Description

A kind of CFBB

Technical field

The utility model relates to the technical field of structures of boiler, is specially a kind of CFBB.

Background technology

Along with China rises steadily to the raising and the burned coal price of environmental requirement, and the continuous development of industrial economy, in a large number at the low-pressure low-temperature low capacity boiler of usefulness because of not adapting to reasons such as environmental requirement, the thermal efficiency be low, face the superseded situation of stopping transport.CFBB has the advantage of many uniquenesses, and is high like efficiency of combustion, fuel tolerance wide, can carry out desulfuration in furnace, can effectively control the discharging of NOx etc.

But after the process burner hearth burning of existing fuel, its fly ash content is high, and contains not by clean-burning material particles, and existing structure can't effectively be handled, and makes that boiler rear portion dust stratification is serious, just needs deashing in very short time, has influenced the normal use of boiler.

Summary of the invention

To the problems referred to above, the utility model provides a kind of CFBB, and it can make that boiler rear portion dust stratification is few, guarantees the normal use of boiler.

A kind of CFBB; Its technical scheme is such: it comprises drum, burner hearth, evaporating heating surface, superheater, economizer, air preheater, back-end ductwork; The top of said burner hearth is equipped with said drum; The flue gas flow direction direction of said burner hearth is equipped with said superheater, evaporating heating surface, economizer, air preheater, back-end ductwork successively; It is characterized in that: lead to tail vertical well gas flue after flowing into horizontal flue, turning flue successively after the flue gas of said burner hearth rises, the below of said horizontal flue is provided with cyclone separator, and said cyclone separator suction inlet is towards said horizontal flue; The below outlet of said cyclone separator connects the returning charge passage; Said returning charge passage leads to the bottom of said burner hearth, and said evaporating heating surface is specially the evaporating heating surface that the cross section is a W shape structure, and said superheater, the evaporating heating surface of W shape structure, economizer, air preheater connects in order and be arranged in order in the said tail vertical well gas flue.

After adopting the structure of the utility model; Material forms flue gas after the burner hearth internal combustion, after flue gas flow into horizontal flue, the flying dust in the flue gas, do not sucked by cyclone separator by clean-burning material particles; And through the returning charge channel flow to burner hearth bottom; Flying dust is discharged from slag notch, is not fully burnt by clean-burning material particles, and it can make that boiler rear portion dust stratification is few, guarantees the normal use of boiler; In addition, the evaporating heating surface of W shape structure makes flue gas fully to contact, and makes energy utilization rate high.

Description of drawings

Fig. 1 is the front view structural representation of the utility model.

The specific embodiment

See Fig. 1; It comprises drum 1, burner hearth 2, evaporating heating surface 10, superheater 8, economizer 11, air preheater 12, back-end ductwork 14; The top of said burner hearth 2 is equipped with said drum 1; The flue gas flow direction direction of said burner hearth 2 is equipped with said superheater 8, evaporating heating surface 10, economizer 11, air preheater 12, back-end ductwork 14 successively; Lead to tail vertical well gas flue 17 after flowing into horizontal flue 15, turning flue 7 successively after the flue gas of burner hearth 2 rises, the below of said horizontal flue 15 is provided with cyclone separator 9, and said cyclone separator 9 suction inlets are towards said horizontal flue 15; The below outlet of said cyclone separator 9 connects returning charge passage 3; Said returning charge passage 3 leads to the bottom of said burner hearth 2, and said evaporating heating surface 10 is specially the evaporating heating surface that the cross section is a W shape structure, and said superheater 8, evaporating heating surface 10, economizer 11, air preheater 12 connect in order and be arranged in order in the tail vertical well gas flue 17.Charging aperture 4 leads to the bottom of burner hearth 2, and the below, bottom of burner hearth 2 is provided with water cooled wind chamber 6, slag notch 16, and the side walls of burner hearth 2 is provided with secondary air channel 5.

Claims

1. CFBB; It comprises drum, burner hearth, evaporating heating surface, superheater, economizer, air preheater, back-end ductwork; The top of said burner hearth is equipped with said drum; The flue gas flow direction direction of said burner hearth is equipped with said superheater, evaporating heating surface, economizer, air preheater, back-end ductwork successively; It is characterized in that: lead to tail vertical well gas flue after flowing into horizontal flue, turning flue successively after the flue gas of said burner hearth rises, the below of said horizontal flue is provided with cyclone separator, and said cyclone separator suction inlet is towards said horizontal flue; The below outlet of said cyclone separator connects the returning charge passage; Said returning charge passage leads to the bottom of said burner hearth, and said evaporating heating surface is specially the evaporating heating surface that the cross section is a W shape structure, and said superheater, the evaporating heating surface of W shape structure, economizer, air preheater connects in order and be arranged in order in the said tail vertical well gas flue.