Straw bale burning direct combustion grain drying hot blast stove

Abstract

The invention discloses a straw bale burning direct combustion grain drying hot blast stove which comprises a refractory brick hearth, a chain grate stoker, a straw drying and bale breaking chamber, an air cooling and material stirring device and a feeding device. A front wall, a rear arch, a separation wall and the like are arranged in the refractory brick hearth, and a semi-gasification combustion chamber, a fixed carbon burnout chamber and an intensified combustion chamber are arranged; the chain grate stoker is horizontally arranged at the bottoms of the straw drying and bale breaking chamber and the refractory brick hearth; the straw drying and bale breaking chamber is arranged in front of a feed port of the refractory brick hearth, and an air-cooled straw bale breaking device capableof supplying oxygen to the intensified combustion chamber is arranged in the straw drying and bale breaking chamber; and the feeding device is used for conveying straw bundles into the straw drying and bale breaking chamber. According to the straw bale burning direct combustion grain drying hot blast stove, the straw bale burning direct combustion problem is solved; the straw bundles can be quickly broken; continuous feeding and continuous deslagging can be realized; the refractory brick hearth adopts staged combustion, so that the combustion effect is improved, and the concentration of generated nitric oxide is reduced; and the air cooling and material stirring device can stir unburnt straw fuel in the fixed carbon burnout chamber to be scattered and burnt out.

Description

technical field [0001] The invention relates to the technical field of straw burning, in particular to a direct-fired grain drying hot air stove for burning straw bundles. Background technique [0002] At present, most of the hot air stoves in grain drying enterprises in my country use coal as fuel, and the soot, sulfur dioxide, nitrogen oxides, etc. produced by coal combustion cause soot-type smog pollution in the atmosphere. However, due to the gradual shortage of fossil energy, production The burning and utilization of material straw has begun to attract people's attention. Biomass energy is the only renewable clean energy on the earth. It is very suitable because of its high volatile content, strong carbon activity, and small environmental hazards after combustion. It is an environmentally friendly fuel because of its large-scale development, transformation and utilization. However, with the development of my country's national economy, great changes have taken place in t...

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Problems solved by technology

However, with the development of my country's national economy, great changes have taken place in the energy structure of my country's vast rural areas. A large amount of straw has been abandoned or burned on the field, causing serious waste of resources and environmental pollution. At present, my country's straw The utilization methods of straw mainly include direct combustion, pyrolysis and fermentation, etc. The utilization methods of straw combustion mainly include traditional scattered combustion, suspension combustion, compact molding combustion, and bundling combustion. However, among these four combustion methods, traditional scattered combustion The efficiency is low; the fly ash of suspended combustion is serious, and the straw is not easy to transport; the dense molding combustion consumes high energy; the straw bundling combustion method combines the advantages of the above three combustion methods, and the bundling method increases the density of straw biomass, which is convenient for transportation At the same time, the bundling method consumes less energy than the compression molding method, so bundling combustion is the most promising combustion method in the future

[0003] However, the existing straw bundle burning cannot ensure that the straw bundles are fully burned. The straw bundles are naturally burned in the furnace by the air blower. There are disadvantages in the above, and it is a problem that those skilled in the art need to solve urgently at present to provide a straw bundled in the furnace, which can be fully burned, has high thermal efficiency, is energy-saving and environmentally friendly, and direct-fires the grain drying hot air stove.

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