Production method of a sludge biomass mixed fuel

Abstract

The invention discloses a production method of a sludge biomass mixed fuel. The production method comprises the steps that multi-stage continuous dewatering and drying are carried out, wherein water absorption of sludge with a high water content is directly carried out by using biomass wood dust, the action of microorganisms in the sludge is fully utilized, the types and the use amount of additives are reduced, the drying efficiency is improved, and the energy consumption is reduced; meanwhile, the sludge is turned into fuel, the emission of SO2 in a combustion process of a solid fuel is reduced, secondary pollution is reduced, no fermentation is needed, the prepared sludge biomass mixed fuel is easy to combust, the heat value of the solid fuel is obviously improved, and the combustion efficiency is improved; the temperature of a combustion zone is higher than 1200 DEG C, so that the fuel can be used to industrial grate-fired kilns and civilian heating. The ash after combustion is richin elements such as calcium, magnesium, phosphorus, potassium, sodium and the like; the production method has no pollution to the environment, is harmless to human health, and is safe and environmentally friendly; no harmful gas is generated; and the problem that urban sludge cannot be directly returned to fields is solved. A new way for resource recovery, reduction and harmless utilization of urban sludge and wood dust is provided.

Description

technical field [0001] The invention relates to C10L fuel not included in other classes or CO2F water, waste water, sewage or sludge [0002] Treatment technology, especially a production method of sludge biomass mixed fuel. Background technique [0003] Along with China's urbanization process and increasing environmental protection efforts, the amount of sludge has also increased significantly. Sewage treatment plants will grow rapidly for a long period of time, and my country's sewage treatment capacity will increase rapidly. [0004] At present, there are 1,929 urban sewage treatment projects under construction across the country, with a total design capacity of about 49 million cubic meters per day. According to statistics, 80% of these sludges have not been properly treated, and many cities have been surrounded by sludge. The wet sludge obtained after treatment in the sewage treatment plant is fluid, rich in oily substances, containing pathogenic microorganisms, organ...

AI Technical Summary

Problems solved by technology

[0016] The above-mentioned methods have their own disadvantages: because the sludge is viscous, it is not easy to break, and the heated surface area is small, so the heat cannot be quickly transferred to the sludge.

When the sludge is first heated, the surface of the sludge is quickly dried, and the dried surface forms a hard shell, which is like a layer of insulation. It is difficult to conduct heat to the inside. It takes a long time to dry to meet the requirements, and the drying heat efficiency is very low.

It is not conducive to energy saving and environmental protection; it is formed first and then dried to produce solid fuel at a high water content, and the sludge and biomass are mixed first and then dried, which is not conducive to the full mixing of the two, resulting in uneven properties of the produced fuel. The damage to the boiler is great, and the molding is carried out under low pressure, and the strength of the solid fuel is not enough

Therefore, this kind of treatment method has the disadvantages of large investment, high operating cost, large drying energy consumption, and low efficiency.

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