Water-cooling vibration grate biomass boiler with flue gas recirculation device

Abstract

The utility model discloses a water-cooling vibration grate biomass boiler with a flue gas recirculation device, which comprises a hearth, a coal spreading air pipe is arranged on the front side of the hearth, a plurality of primary air chambers are arranged on the lower portion of the hearth, and the primary air chambers respectively comprise a primary air chamber for preheating, a primary air chamber for burning and a primary air chamber for burnout. A flue gas recirculation device is arranged in front of the coal spreading air pipe and the primary air chambers, and an adjusting valve is installed on the flue gas recirculation device and used for adjusting the inlet flow of tail flue gas. The utility model provides a flue gas recirculation technology for a water-cooling vibration grate biomass boiler, which can effectively reduce the generation of original NOx, is more sufficient in preheating and better in combustion effect, prevents fuel at the lower part of a feed port from being combusted in advance, and prolongs the service life of a grate flexible pipe. And the method has relatively high social use value and application prospect.

Description

TECHNICAL FIELD

[0001] The utility model relates to water -cooled grate boiler technical field especially with flue gas recirculation device's water -cooled vibration furnace grate biomass boiler. BACKGROUND

[0002] Water -cooled vibration furnace grate straw boiler is one kind of furnace type that is more widely used in biomass boiler. The conventional high temperature and high pressure water -cooled vibration straw boiler adopts three primary air chambers to enter the wind under the water -cooled vibration furnace grate, which corresponds to the fuel preheating, combustion and burnout three processes respectively. But with the uncertainty of biomass fuel, it is easy to deviate from the design value in actual use, and the three air chambers and the primary air hole of the furnace grate cannot be changed, only the overall air volume of each air chamber can be adjusted, and the adjusting means is limited. When the moisture content of fuel is too large, the first air chamber is insufficient, the fuel preheating is insufficient, the fuel combustion period is too short, the combustion is incomplete, and the slagging power of the end of the furnace grate is large. When the moisture content of fuel is too small, the preheating period is too long, the primary air is too sufficient, the original NOx generated by combustion is too large, and the denitration load is increased. SUMMARY

[0003] To solve the above technical problems, the utility model discloses a kind of water -cooled vibration furnace grate biomass boiler with flue gas recirculation device, which can effectively reduce the original NOx generation, preheat more fully, combustion effect is better, and prevent the fuel in the lower part of feeding port from burning in advance, extend the service life of furnace grate flexible tube. It has high social use value and application prospect.

[0004] The utility model adopts the following technical scheme:

[0005] A kind of water -cooled vibration furnace grate biomass boiler with flue gas recirculation device, including hearth, hearth front side is equipped with coal spreading air pipe, hearth lower part is provided with multiple primary air chambers, multiple primary air chambers include the primary air chamber for preheating, the primary air chamber for combustion and the primary air chamber for burnout respectively, the coal spreading air pipe and multiple primary air chambers are equipped with flue gas recirculation device in front, flue gas recirculation device is installed with regulating valve, for the adjustment of tail smoke gas inlet flow.

[0006] As preferred, the multiple primary air chambers include two primary air chambers for preheating, one primary air chamber for combustion and two primary air chambers for burnout, a total of 5 primary air chambers.

[0007] As preferred, the two primary air chambers for preheating output 50% primary air hot air and 50% tail smoke gas.

[0008] As preferred, the coal spreading air pipe is 100% tail smoke gas.

[0009] As preferred, the one primary air chamber for combustion and the two primary air chambers for burnout output 100% primary air hot air.

[0010] The utility model discloses a kind of flue gas recirculation technologies for water-cooled vibrating grate biomass boiler, can effectively reduce original NOx generation, preheat more fully, combustion effect is better, and prevent the fuel of lower part of feeding port from burning in advance, prolong the service life of grate flexible tube.It has higher social use value and application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a kind of air distribution system schematic diagram of the utility model;

[0012] Figure 2 It is a kind of structure schematic diagram of the utility model;

[0013] In the drawing: 1, furnace, 2, primary air chamber, 3, coal spreading air pipe, 4, flue gas recirculation device. DETAILED DESCRIPTION

[0014] The technical scheme of the utility model is further specifically described as follows by specific embodiment, and in conjunction with drawings:

[0015] Embodiment: as shown in Figure 1 And Figure 2 A water-cooled vibrating grate biomass boiler with flue gas recirculation device, including furnace 1, coal spreading air pipe 3 is equipped in furnace front side, and five primary air chambers 2 are arranged in furnace lower part, and five primary air chambers include two primary air chambers for preheating, one primary air chamber for combustion and two primary air chambers for burnout respectively, and flue gas recirculation device 4 is arranged in front of coal spreading air pipe and five primary air chambers, and adjusting valve is installed on flue gas recirculation device, for adjusting the flow of tail flue gas.

[0016] Two primary air chambers for preheating output 50% primary air hot air and 50% tail flue gas. The material spreading air in coal spreading air pipe is 100% tail flue gas.

[0017] One primary air chamber for combustion and two primary air chambers for burnout output 100% primary air hot air.

[0018] In order to solve the problem that water-cooled vibrating grate biomass boiler fuel is not fully combusted, original NOx is too large, and denitration load increases, the utility model provides a kind of flue gas recirculation technologies for water-cooled vibrating grate biomass boiler, can effectively reduce original NOx generation, preheat more fully, combustion effect is better, and prevent the fuel of lower part of feeding port from burning in advance, prolong the service life of grate flexible tube.It has higher social use value and application prospect.

[0019] The above-described embodiments are only a preferred scheme of the present application, and do not limit the present application in any form, and other variations and modifications are possible without departing from the technical scheme recited in the claims.

Claims

1. A water-cooled vibrating grate biomass boiler with flue gas recirculation device, comprising a furnace (1), a coal distribution duct (3) is arranged on the front side of the furnace, a plurality of primary air chambers (2) are arranged at the lower part of the furnace, the plurality of primary air chambers (2) respectively comprise a primary air chamber for preheating, a primary air chamber for combustion and a primary air chamber for burnout, characterized in that, The coal injection air duct (3) and the plurality of primary air chambers (2) are provided with a flue gas recirculation device (4) in front, and an adjusting valve is installed on the flue gas recirculation device (4) for adjusting the tail flue gas inflow.

2. The water-cooled vibrating-grate biomass boiler with flue gas recirculation according to claim 1, characterized in that, The plurality of primary air chambers (2) include two primary air chambers for preheating, one primary air chamber for combustion, and two primary air chambers for burnout, a total of five primary air chambers (2).

3. The water-cooled vibrating-grate biomass boiler with flue gas recirculation according to claim 2, characterized in that, The two primary air chambers for preheating output 50% primary air hot air and 50% tail flue gas.

4. The water-cooled vibrating-grate biomass boiler with flue gas recirculation according to claim 1, characterized in that, The coal injection air in the coal injection air duct (3) is 100% tail flue gas.

5. The water-cooled vibrating-grate biomass boiler with flue gas recirculation according to claim 1, characterized in that, The one primary air chamber for combustion and the two primary air chambers for burnout output 100% primary air hot air.

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