Novel boiler front feeding device of straw biomass CFB boiler

Abstract

The invention discloses a novel boiler front feeding device of a straw biomass CFB (circulating fluidized bed) boiler, which includes a boiler front feed bin assembly, a first-stage blending spiral assembly, a blanking pipe assembly, a second-stage feeding spiral assembly and a safety control assembly, wherein the boiler front feed bin assembly includes two feed bins; an infrared camera is mounted at the top end in each feed bin; explosion-proof relieve valves are installed at the middle parts of the two sides of each feed bin; a manhole door is arranged at the middle part on the outer side of each feed bin; and two activators are arranged at the lower part of each feed bin. The novel boiler front feeding device fully combining the structural characteristics of the screw feeder, adopts the brand-new model that the feeding process sectional functions are decomposed and the safety fire-prevention measures are reasonably linked, and can satisfy the high load of the boiler and has excellent use effect for all sorts of biomass fuels as proven by practice.

Description

technical field [0001] The invention relates to a feeding device in front of a boiler furnace, in particular to a new straw biomass CFB (CFB Circulating Fluidized Bed) technology, which has greater fuel applicability and pollutant discharge than the pulverized coal combustion technology. Advantages of combustion technology) Boiler front feeding device. Background technique [0002] Biomass power generation technology is a new technology that converts biomass energy into electric energy, mainly using crop straw and forestry waste as fuel for power generation. [0003] The fuel of straw power plants is generally divided into gray straw, yellow straw and shells. Gray straw includes: cotton stalks, branches, mulberry sticks and other hard straws; yellow straw mainly includes: corn straw, wheat straw, rice straw and other soft straws; Shells are mainly: rice husks, peanut shells, etc. [0004] Therefore, there are many kinds of biomass fuels, with great differences in physical ...

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Problems solved by technology

[0004] Therefore, there are many kinds of biomass fuels, with great differences in physical properties. Due to their light and soft texture and poor fluidity, they are easy to be entangled, bridged, and arched during transportation, especially for soft straw materials, and the phenomenon of material entanglement is serious.

In addition, due to the low bulk density and low calorific value of biomass fuel, the volume to be transported is relatively large

However, when dealing with straw materials, the conventional screw feeding device often has problems such as smearing, blocked rotation, material jamming and material blocking, which leads to unstable operation of biomass utilization process equipment and affects the safe and stable operation of the boiler.

[0005] At the same time, due to the special national conditions of our country, the collection, storage, transportation, and pretreatment modes are quite different from those of foreign countries. The domestic biomass fuel has a strong particularity, and it is difficult to ensure the ideal length during the cutting process. The arch phenomenon is very common, resulting in poor material feeding and feeding, affecting the combustion conditions of biomass direct-fired boilers

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