The development of biomass boiler in china

Biomass boiler is the best replacement of the coal-fired boilers, which take straw and rice husk as materials. The materials are process by the biomass pellet mill after crushing and used as fuel in the biomass boiler. The ashes after burning can be used as high quality fertilizer. The combustion value of biomass pellets are up to 3800-4200 kcal, which are equal to the medium calorific value of coal. The combustion value is equal to the coal, the pattern of ignite is easy. About 4 tons of standard coal has been processed from agricultural products, forestry residue resources per year as fuel. China has plenty of resources for biomass, the heat supplying market space which biomass boiler replaced of the coal fired boiler is big, so the foundation and conditions of heat supplying by the biomass pellet boiler is mature and it has great development potential.   

Biomass molded fuel can replace the low efficiency and high air pollution coal used by small and medium sided coal fired boiler in city and rural area (efficiency of this boiler is only 60% without desulfurization and denitrification), and these coals can be used for high efficiency low pollution large scale power station furnace, which is an win-win solution for farmers living, environment and various energy proper role playing. For china’s situation, applying of renewable resources concentrated on the highly fragmented peasants and small town as the main objects, which is natural energy service configuration.  

 

In fact, the pattern of power generation and heat supply by biomass molded fuel has become the renewable heating energy for low carbon clean eco-friendly economy, which is an important way to carry out the state department’s prevention and control plan of atmospheric pollution, to replace of the coal fired boiler for heat supply and other heavy air pollution industry in China. According to the report, our country’s biomass boiler accounts for 1.5% of the total amount of industrial boiler, which is about 9200 stands; the quantity of home use boiler is over ten million, the annual production is about two million. From the industry feedback, the demanding for biomass boiler maybe increased for a new round. 

 

As for the design of biomass boilers structure, it has larger inner chamber space than the traditional boiler with reasonable design of two times air, which is beneficial to the full combustion of large amount of volatile during the instant burning of biomass pellet fuel. The efficiency of biomass boiler is often over 80%. The bigger the boiler, the higher the efficiency of the boiler is. The highest level can up to 88.3%, which are 15% higher than the coal fired boiler. During the research of biomass boiler, the issues of stain, corrosion, slag of heating surface and aerosol emissions etc are to be solved. And selection of equipment is beneficial to improve the efficiency of boiler. 

 

With the development of biomass power generation industry, the biomass boiler has been concerned by the industry generally. At present, the related government departments have published and regulated the industry standard for the biomass solid fuels. The publishing of this standard expected to promote the application of biomass boilers in large scale on the market. Meeting the demand for development of urban environment and improving the economic results of enterprises at the same time, more and more industrial enterprises have taken part in the applying of clean biomass boiler.