Blanking port integrated blanking device for biomass fuel circulating fluidized bed boiler

Abstract

The invention discloses a blanking port integrated blanking device for a biomass fuel circulating fluidized bed boiler. The blanking port integrated blanking device comprises an open-jointed pipe, a flow guide pipe, a disturbance air pipe and a material spreading air pipe; an air chamber of the disturbance air pipe is communicated with the open-jointed pipe; the flow guide pipe is inserted into the boiler wall of the boiler and a castable layer and then is directly communicated with the hearth of the boiler; the pipe orifice of the flow guide pipe, which is communicated with the hearth of the boiler is a blanking port; an air chamber of the material spreading air pipe is communicated with the corner of the open-jointed pipe, which is connected with the flow guide pipe; the communication part of the air chamber of the material spreading air pipe and the corner is a material spreading air spray port which is formed in the lower part of the air chamber of the material spreading air pipe; and the flow direction of air entering the flow guide pipe from the material spreading air spray port is the same as the downward inclined direction of the flow guide pipe. Moreover, hot secondary air flows through a disturbance air spray port to form disturbance air which can disturb and loosen agglomerated biomass fuels so as to fulfill the aim of dispersing the materials, and the reverse fleeing of the fuels in the hearth can be prevented. The blanking device can effectively guarantee the flowability and continuity of the biomass fuels in the falling process.

Description

technical field [0001] The patent of the present invention relates to an auxiliary equipment of a boiler, in particular to an integrated blanking device of a biomass fuel circulating fluidized bed boiler blanking port. Background technique [0002] The fuel for biomass fuel circulating fluidized bed boilers is mainly forestry biomass, agricultural biomass, etc. Specifically, it includes firewood, fallen leaves, bark, roots, forestry processing waste, bagasse, sugarcane leaves, straw, fruit shells, fruit stones, corncobs, etc. Biomass fuel usually passes through the feeding system in front of the furnace, and then enters the furnace for combustion through the feeding pipe and the feeding port. [0003] The typical layout of the rear blanking pipe and the blanking port of the existing biomass fuel circulating fluidized bed boiler furnace feeding system is as follows: Figure 1 to Figure 4 As shown, it mainly includes a feeding pipe 101 in front of the furnace, a guide pipe 10...

AI Technical Summary

Problems solved by technology

The existence of the included angle α1 causes the angle of the biomass fuel entering the feed channel 107 from the draft tube 103 to change, which increases the resistance of the biomass fuel entering the furnace, which is not conducive to the flow of the biomass fuel; the existence of the included angle α2 causes the The sowing wind ejected from the sowing air nozzle 104a has an upward supporting force on the biomass fuel in the feeding channel 107, which increases the resistance of the biomass fuel entering the furnace, and greatly reduces the sowing effect of the sowing wind nozzle 104a

What is more serious is that due to the existence of these two dislocation angles and the direction of material flow, it is easy for the biomass fuel and the broadcasting wind to wash and wear the castable area at the lower part of the feed channel 107, forming a serious wear zone 107a. As a result, the surface of area 107a is uneven, and the uneven surface structure will greatly increase the friction of fuel entering the furnace, and it is very easy for biomass fuel to accumulate in this area, resulting in blockage of fuel at the discharge port

In addition, due to the high moisture content of biomass fuel, it is easier to form agglomerated materials during the transportation process, and the agglomerated materials fall from the feeding and dropping pipe 101 in front of the furnace, which aggravates the clogging of the discharging opening

[0006] The blockage of the boiler blanking port will limit the load-carrying capacity of the boiler unit. If it cannot be cleared for a long time, it may cause fire inside the blanking pipe. Backtracking to the feed bin in front of the furnace, seriously affecting the safe operation of the boiler unit

In addition, the large-area erosion and wear at the position of the castable area 107a will also cause wear to the water wall wrapped under the castable, and the furnace tube will burst and leak

[0007] Simultaneously, the feeding air nozzle 102a of the feeding air pipe 102 is a strip nozzle, and the wind injected into the feeding pipe 101 by the nozzle cannot generate disturbance in the feeding pipe 101, because the biomass fuel easily forms a lump material, The existing feeding air nozzle 102a cannot disturb and loosen the agglomerated biomass fuel to achieve material dispersion, and it is easy to cause blockage of the fuel passing through the feeding pipe 101 and the draft pipe 103 when it enters the feeding port, resulting in bad as a result of

In addition, when the blanking port is blocked, the passage of the feeding air into the furnace will be blocked, and the feeding air can only flow back from the feeding and feeding pipe in front of the furnace to the feeding bin in front of the furnace, which will affect the normal operation of the feeding bin in front of the furnace

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