How do rice husks generate electricity?
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How do rice husks generate electricity?


Rice husk contains about 30 – 50% organic carbon and has a high calorific value of 13 – 16 MJ/kg. It can be used to generate fuel, heat or electricity through thermal, chemical or biological processes.


What are the reasons for using rice husk as biomass fuel?

Rice husk is a by-product of the rice production process. The popularity and year-round production of rice, combined with the fact that it is grown in various scales around the world makes rice husk a natural fuel for biomass power plants that attracts attention. The reason is simple: rice hulls are abundant and easy to collect, and also

It is also a good solution to the problem of how to deal with agricultural waste. The unique design of a biomass power plant using rice husk as a feedstock has proven to be not only well run, but also highly profitable.


The principle of rice husk power generation

The main principle of rice husk power generation is to use the waste rice husk from grain processing as raw material, burn it in a gas generator to produce gas, filter it with water, purify it into a pure gas, and then send it to a gas generator to burn and do work to drive the generator to generate electricity.


The former mainly consists of rice husk gas generator, gas purifier, gas internal combustion engine, generator and other equipment; the latter mainly consists of rice husk boiler, steam turbine, generator and other equipment. The latter mainly consists of rice husk boiler, steam turbine, generator and other equipment. The former can be small or large in scale, with small initial investment; the latter has a large starting scale and large initial investment due to the absence of a small turbine.


How do rice husks generate electricity?

(1) Direct combustion power generation: Direct combustion power generation is the direct combustion of biomass in boilers to produce steam to drive steam turbines and generators to generate electricity. The key technologies for direct combustion of biomass for power generation include biomass raw material pretreatment, boiler corrosion, boiler feedstock suitability and fuel efficiency, steam turbine efficiency and other technologies.


(2) Mixed power generation: Biomass can also be mixed with coal as a fuel for power generation, called biomass mixed combustion power generation technology. There are two main types of mixed combustion methods. One is biomass mixed directly with coal and put into combustion, the way for fuel handling and combustion equipment requirements are high, not all coal-fired power plants can be used; one is the gas produced by biomass gasification and coal mixed combustion, this mixed combustion system in the combustion, the resulting steam together into the turbine generator unit. The operation practice of biomass and coal mixed combustion power generation proves that there will be a broad application prospect in China.


(3) Gasification power generation: Biomass gasification power generation technology refers to the conversion of biomass into gaseous fuel in the gasifier, which is purified and then directly fed into the gas engine for combustion and power generation or directly into the fuel cell for power generation. One of the key technologies of gasification power generation is gas purification. The gas from gasification contains certain impurities, including ash, coke and tar, which need to be removed by purification system to ensure the normal operation of power generation equipment. The main technologies are fixed-bed gasification and fluidized-bed gasification, which use a variety of wood, forestry residues and rice husks to produce combustible gas mainly for power generation. It can be expected that biomass gasification for power generation will become one of the fastest growing new industries in China in the next few decades.

Advantages of rice husk power generation:

(1) Rice husk can replace fossil fuels and be used as an energy source with significant ecological benefits

(2)The principle of rice husk power generation is simple and easy to operate

(3)China is a large rice growing country, and the development potential of rice husk is huge

(4)Small investment, quick effect, easy to promote

(5)Rice husk power generation, turning waste into treasure, improves farmers’ income and reduces environmental pollution