CN207316902U - A kind of biomass boiler flue afterburning device and biomass boiler - Google Patents

Abstract

It the utility model is related to a kind of biomass boiler flue afterburning device and the biomass boiler with the flue afterburning device, the ring-shaped protrusion that cross section is venturi tubulose is specifically provided with flue, and supplemental combustion air supply pipe is set, connected by supplemental combustion air assignment channel inside the supplemental combustion air supply pipe and the ring-shaped protrusion, the supplemental combustion air is evenly supplied in the flue, second-time burning is provided for combustible imperfect combustion in flue gas, it is effective to solve the problems, such as that fuel availability is low and second-time burning causes cloth bag impaired, it is simple in structure feasible.

Description

A kind of biomass boiler flue afterburning device and biomass boiler

Technical field

The utility model is specifically related to a kind of boiler for biomass fuel, is more specifically related to a kind of biomass Boiler flue combustion-compensating device.

Background technology

Biomass Industrial Boiler of the prior art, most common mode are to use direct combustion pattern, mainly including horizontal and It is vertical, wherein, most of horizontal biomass boilers are all the structure type for remaining original coal-burned industrial boiler, and use is reciprocating Fire grate either traveling-grate stoker, and the size to combustion chamber and air-supply structure have done corresponding adjustment on this basis.But For biomass fuel, it has the characteristics that with coal facies than entirely different, such as proportion is small, and burning point is low, and ash content is light etc.. In actual use, due to being typically maintained certain negative-pressure firing in burner hearth, for this reason, portion's dispersing powdery material is not having To completely burned, that is, during also in carbonization state, heat exchange pipeline is just carried along into by flue gas, this part does not have completely burned Material on the one hand the effective rate of utilization of fuel can be caused low, on the other hand into after bag-type dust removal system with air contact, Generation second-time burning, is easy to cause cloth bag damage, this is especially prominent during using bulk biomass fuel.

The content of the invention

Dissipating granular material to solve above-mentioned biomass Industrial Boiler does not have completely burned to be carried along into heat exchange by flue gas Pipeline, causes fuel availability lowly and second-time burning the problem of causing cloth bag be damaged, the following skill of the utility model plan proposition Art scheme.

A kind of biomass boiler flue afterburning device, has flue, it is characterised in that be provided with ring-type in the flue and dash forward The portion of rising, the cross section of the ring-shaped protrusion is in Venturi tube shape so that high-temperature flue gas forms ejector action herein；The flue Supplemental combustion air supply pipe is set in outer or flue refractory wall；And connect the afterburning sky by some supplemental combustion air assignment channels Inside gas supply pipe and the ring-shaped protrusion, the supplemental combustion air is evenly supplied in the flue.

Preferably, the supplemental combustion air assignment channel is evenly arranged along the ring-type of ring-shaped protrusion so that the afterburning Air can uniformly be mixed with the high-temperature flue gas.

A kind of biomass boiler, it has further included fire grate system, burner hearth, feeding system with above-mentioned flue afterburning device And slag-discharging device；The burner hearth includes face arch, rear arch,

Preferably, wherein described face arch is tilted to the rear arch direction, the rear arch is tilted to the face arch direction, with High-temperature flue gas is oriented to flue.

Preferably, the fire grate system uses traveling-grate stoker or reciprocal grate.

Preferably, the feeding system is arranged on the outside of the face arch, the feeding system includes hopper, the hopper Lower exit port be provided with dispenser, the dispenser is driven by motor and its gear reducer.

Preferably, the dispenser is screw feeder or turnover plate type dispenser.

Preferably, the slag-discharging device is spiral for deslagging.

It is high temperature according to the biomass boiler of above-mentioned biomass boiler flue afterburning device and above-mentioned flue afterburning device The imperfect combustion combustible of flue gas entrainment provides second-time burning, can effectively improve the whole utilization efficiency of fuel, And prevent flammable ash content from the filter element such as second-time burning, damage bag-type dust occurs after entering flue gas purification system.

Brief description of the drawings

Fig. 1 is the preferred arrangement schematic diagram of double grate opposed type biomass boiler.

Embodiment

The utility model provides a kind of biomass boiler flue afterburning device., below according to Fig. 1 example arrangement The preferred embodiment of the utility model is described in detail, the example of the embodiment is shown in the drawings, it is intended to for explaining The inventive concept of bright the utility model, it is impossible to be interpreted as the limitation to scope of protection of the utility model.

As shown in Figure 1, the biomass boiler has flue afterburning device, also including fire grate system 3, burner hearth, feeding System and slag-discharging device 4, the fire grate system can use traveling-grate stoker, can also use reciprocal grate.Before the burner hearth includes Arch 1, rear arch 2, wherein the face arch 1 is tilted to 2 direction of rear arch, the rear arch 2 is tilted to 1 direction of face arch, will High-temperature flue gas 12 is oriented to flue 8.

The flue afterburning device is arranged in the flue 8, its with ring-shaped protrusion 9, the ring-shaped protrusion 9 Cross section is in Venturi tube shape, i.e., middle to reduce, the widened shape of entrance and exit, is arranged so that the high-temperature flue gas 12 Air-flow produces pressure change herein, forms ejector action.The flue benefit burner, which further includes, to be arranged on outside the flue 8 Supplemental combustion air supply pipe 10, the supplemental combustion air supply pipe 10 can be also embedded in the refractory wall of the flue 8.For by the benefit Combustion air is evenly supplied in the flue 8, is provided with some supplemental combustion air assignment channels 11, is supplied with connecting the supplemental combustion air To the inside of pipe 10 and the ring-shaped protrusion 9, the uniform cloth of ring-type of supplemental combustion air assignment channel 11 along the ring-shaped protrusion Put so that the supplemental combustion air can uniformly be mixed with the high-temperature flue gas 12, be in the high-temperature flue gas 12 it is entrained not The combustible of completely burned provides combustion air with aftercombustion.

Further, the utility model also provides a kind of biomass boiler, and the biomass boiler is mended with above-mentioned flue Fire device.

Preferably, the biomass boiler further includes feeding system, be provided with feeding system on the face arch, it is described on Material system specifically includes hopper 5, accommodates spare biomass fuel 6 in the hopper, the lower exit port of the hopper 5 is provided with Dispenser 7, the dispenser 7 are screw feeder 11, can also use turnover plate type dispenser, it is driven by motor and its gear reducer It is dynamic.

Preferably, the slag-discharging device 8 is spiral for deslagging.

The technical solution that the embodiment of the utility model is provided, is provided with flue benefit in the flue of biomass boiler Device is fired, the imperfect combustion combustible carried for high-temperature flue gas provides second-time burning, can effectively improve fuel Whole utilization efficiency, and can effectively prevent flammable ash content from second-time burning occurs after entering flue gas purification system, damage cloth bag The filter elements such as dedusting.

Although the embodiment of the utility model has been shown and described above, it is to be understood that above-described embodiment is Exemplary, it is impossible to the limitation to the utility model is interpreted as, those skilled in the art can be to above-mentioned reality in the design of the utility model Apply example be changed, modifications or substitutions mode, also within its protection domain.

Claims (7)

1. a kind of biomass boiler flue afterburning device, has flue, it is characterised in that be provided with circular protrusion in the flue Portion, the cross section of the ring-shaped protrusion is in Venturi tube shape so that high-temperature flue gas forms ejector action herein；Outside the flue Or supplemental combustion air supply pipe is set in flue refractory wall；And connect the supplemental combustion air by some supplemental combustion air assignment channels Inside supply pipe and the ring-shaped protrusion, the supplemental combustion air is evenly supplied in the flue.

2. biomass boiler flue afterburning device as claimed in claim 1, it is characterised in that the supplemental combustion air assignment channel It is evenly arranged along the ring-type of ring-shaped protrusion so that the supplemental combustion air can uniformly be mixed with the high-temperature flue gas.

3. a kind of biomass boiler, has flue afterburning device as claimed in claim 1 or 2, has further included fire grate system, stove Thorax, feeding system and slag-discharging device；The burner hearth includes face arch and rear arch, and the face arch is tilted to the rear arch direction, institute State rear arch to tilt to the face arch direction, the high-temperature flue gas is smoothly oriented to the flue.

4. biomass boiler as claimed in claim 3, it is characterised in that the fire grate system uses traveling-grate stoker or reciprocating furnace Row.

5. biomass boiler as claimed in claim 4, it is characterised in that the feeding system is arranged on the outside of the face arch, The feeding system includes hopper, and the lower exit port of the hopper is provided with dispenser, and the dispenser is by motor and its subtracts Fast machine driving.

6. biomass boiler as claimed in claim 5, it is characterised in that the dispenser is given for screw feeder or turnover plate type Glassware.

7. biomass boiler as claimed in claim 6, it is characterised in that the slag-discharging device is spiral for deslagging.