Method for preparing solid fuel by mixing sludge and biomass

Abstract

The invention discloses a method for preparing a solid fuel by mixing sludge and biomass. The method comprises the following steps: (1) pretreating: adding additive accounting for 1-5% of the dry basis quantity of the sludge to the sludge; dewatering and drying the obtained mixture until the water content is 10-25%; crushing and sieving to form dried sludge raw material; dewatering and drying the biomass until the water content is 10-25%; crushing and sieving the biomass so as to obtain dried biomass raw material; (2) mixing and forming: mixing and stirring the dried sludge raw material and the dried biomass raw material to obtain a raw material mixture, wherein the mass fraction of the dried sludge raw material is 30-70%; the mass fraction of the dried biomass raw material is 70-30%; and extruding and forming the raw material mixture so as to obtain the solid fuel. The method disclosed by the invention is low in cost, energy-saving and environment-friendly, realizes the recycle of the solid waste and the biomass and effectively solves the treatment problem of the solid waste and the biomass.

Description

technical field [0001] The invention belongs to the field of solid waste reuse, and in particular relates to a method for preparing solid fuel by mixing and forming sludge and biomass after drying. Background technique [0002] Since the beginning of the 21st century, energy and environmental issues have always been the central issues that all countries in the world are facing and are related to the sustainable development of the national economy. In order to alleviate and gradually solve this problem, countries all over the world are actively developing renewable new energy. [0003] With the rapid development of the global economy and people's increasing concern for the environment, the amount of sewage treatment has increased rapidly, and the corresponding sludge production has also increased rapidly. Sludge refers to the solid, semi-solid and liquid waste produced by sewage treatment. It is an extremely complex heterogeneous body composed of organic debris, bacterial ce...

AI Technical Summary

Problems solved by technology

The above-mentioned methods have their own disadvantages: adding coal powder is not conducive to energy conservation and environmental protection; to produce solid fuel after molding at a relatively high moisture content, it is generally necessary to add a binder, which is costly, and the molding fuel is dried during the drying process. It is prone to cracking and low strength; mixing sludge and biomass first and then drying is not conducive to the full mixing and uniformity of the two, resulting in uneven properties of the produced fuel, great damage to the boiler, and molding under low pressure Go ahead, solid fuel is not strong enough