CN201014428Y

CN201014428Y - Externally fired boiler

Info

Publication number: CN201014428Y
Application number: CNU2007200100965U
Authority: CN
Inventors: 关文达
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-01-12
Filing date: 2007-01-12
Publication date: 2008-01-30
Anticipated expiration: 2017-01-12

Abstract

An external firing boiler pertains to an improvement of a boiler structure. The utility model aims at providing the external firing boiler with high heat efficiency. The utility model comprises a furnace body provided with a furnace cover; the essential structure of the utility model is that a U-shaped hearth with an opening at one end is arranged above a bracket of the furnace, a central tube at the other end of the U-shaped hearth is a secondary air duct, the secondary air duct is connected with a blower through a spiral air duct and a pipeline which are arranged between the spiral blades on the furnace body, the space among the spiral air duct, the pipeline and the U-shaped heath is provided with a water circulating cavity provided with water inlet holes and water outlet holes.

Description

Externally fired boiler

Technical field:

The utility model is the improvement that belongs to boiler structure.

Background technology:

The type of furnace complexity of traditional coal-burned industrial boiler, various in style; China's a large amount of uses at present, and representative have family burner and grate furnace.

1, chamber burner:

The chamber burner is earlier raw coal to be ground into coal dust, with air-flow coal dust is blown into burner hearth again, mixes with air in the furnace chamber space and is a kind of combustion apparatus that suspended state burns; Belong to large-scale, modernized coal-burning boiler, be mainly used in generating.The Industrial Boiler bigger for capacity also often adopts this combustion system.

2, grate furnace:

Grate furnace is the boiler of stratified combustion, and wherein representative is chain furnace, and its structure is the fairly perfect type of furnace.Its mechanical degree height, main operation such as coal, scarfing cinder, ash disposal is finished by machinery.The coal of going into stove moves with fire grate, finishes the preheating and drying of coal successively, and volatile matter is separated out and coke formation, burning, each stage of after-flame.The lime-ash in afterburnt drops down onto slag bucket by device at the slag plate shovel that removes of fire grate end, discharges out of the furnace.

But it is lower that the common drawback of above-mentioned two kinds of stoves is efficiencies of combustion; For example, the chain furnace of domestic a large amount of uses at present be 70-80% by the national regulation thermal efficiency, and the thermal efficiency of actual motion only reaches 65-72%; Wasted a large amount of fire coals.

The utility model content:

The utility model is exactly at the problems referred to above, provides a kind of thermal efficiency high externally fired boiler.

The utility model adopts following technical scheme: the utility model comprises the body of heater with bell, the top of the support of its structural feature body of heater is provided with the U type burner hearth that an end has opening, the other end central tube of U type burner hearth is outward a secondary air duct, secondary air duct links to each other with blower fan by the spiral duct between the helical blade on the body of heater, pipeline, is the water torus with inlet opening, apopore between spiral duct, pipeline, the U type burner hearth.

The beneficial effects of the utility model:

Because secondary wind of the present utility model after preheating, fully mixes high speed rotary combustion in U type burner hearth with the coal dust that enters by central tube; Enter again in the burner hearth of boiler of configuration and burn away.Therefore make coal dust in boiler of the present utility model, be able to abundant burning, and combustion efficiency is very desirable, for example, compares with chain furnace: the fire coal rate 99% that burnouts, the thermal efficiency is more than 90%; Temperature is economized on coal and can be reached more than 45% more than 1700 ℃ in the stove.

Description of drawings:

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

Fig. 2 is the left view of Fig. 1;

Fig. 3 is the part vertical view of Fig. 1;

Fig. 4 is the full sectional view of Fig. 1;

Fig. 5 is the A-A cutaway view of Fig. 4.

The specific embodiment:

The utility model comprises the body of heater 1 with bell 3, the top of the support 2 of body of heater 1 is provided with the U type burner hearth 10 that an end has opening 9, outside the central tube 6 of the other end of U type burner hearth 10 is secondary air duct 12, secondary air duct 12 links to each other with blower fan by the spiral duct 14 between the helical blade 13 on the body of heater 1, pipeline 7, is the water torus 11 with inlet opening 8, apopore 5 between spiral duct 14, pipeline 7, the U type burner hearth 10.

U type burner hearth 10 is a horizontally set; The concentricity pipe 6 connection bores of U type burner hearth 10 are small end, and opening 9 place's bores are big end, and the coal dust of more convenient high speed rotary combustion is introduced in the boiler of configuration smoothly.

Boiler of the present utility model can be widely used in the supporting use in stokehold of chamber burner, grate furnace Industrial Boiler.

Below in conjunction with a description of drawings course of action of the present utility model:

At first, coal dust is entered U type burner hearth 10 simultaneously through central tube 6, light by fire hole 4 through blower fan; Meanwhile, secondary wind through pipeline 7, spiral duct 14, secondary air duct 12 (meanwhile, the preheating of the water in the water torus 11), enter in the U type burner hearth 10 with coal dusts and fully mix, behind the rotary combustion, in U type burner hearth 10 openings 9 enter the burner hearth of boiler of configuration, burn away again through central tube 6.

Claims

1. externally fired boiler, comprise the have bell body of heater (1) of (3), the top that it is characterized in that the support (2) of body of heater (1) is provided with the U type burner hearth (10) that an end has opening (9), the central tube (6) of the other end of U type burner hearth (10) is outer to be secondary air duct (12), secondary air duct (12) links to each other with blower fan by the spiral duct (14) between the helical blade (13) on the body of heater (1), pipeline (7), is the water torus (11) with inlet opening (8), apopore (5) between spiral duct (14), pipeline (7), the U type burner hearth (10).

2. externally fired boiler according to claim 1 is characterized in that U type burner hearth (10) is a horizontally set; Concentricity pipe (6) the connection bore of U type burner hearth (10) is a small end, and opening (9) is located bore and is big end.