Sludge fuel and manufacturing method thereof

Abstract

The invention provides sludge fuel which comprises sludge, a sulfur-fixing agent, a combustion improver and barks, has the characteristics of high heat value, low ignition point, combustion completeness, low sulfur content, low cost and sulfur fixation during combustion and can be used for a coal burning boiler as a substitute of the coal; the invention also provides a manufacturing method of the sludge fuel, wherein the sludge, the sulfur-fixing agent and the water are mixed, compacted by extrusion and dried, finally the sludge fuel can be obtained; the method has the advantages that the operation is simple, the implementation is easy, the drying treatment for the sludge is not required, the severe conditions such as high pressure and heating are not required, the shaping effect of the product is good, and the indexes such as the compression strength are excellent.

Description

technical field [0001] The invention relates to waste treatment and resource utilization technology, in particular to a sludge fuel and a manufacturing method thereof. Background technique [0002] The paper industry is an important part of the national economy, but also a serious polluting industry. In 2011, the annual output of hardened sludge in my country's paper industry exceeded 20 million tons. There are two main types of papermaking sludge: biological sludge and white mud. Biological sludge is a sedimentary substance produced during the papermaking wastewater treatment process, mainly fine fibers and inorganic mineral substances. The lime mud comes from the lime mud recovery section of the alkali recovery workshop, and is the product of causticization reaction. The main components are calcium carbonate, excess lime added in the causticization process, residual sodium hydroxide, dust impurities, etc. The value is generally between 12 and 13. Due to the large disch...

AI Technical Summary

Problems solved by technology

[0005] The prior art provides reports of the use of sludge, including paper sludge, for fuel or fertilizer, eg coal, sludge, zeolites for fuel blocks, and quicklime is also added in some existing technologies. In such technologies, the amount of coal is generally more than half, and the cost is relatively high

In addition, the prior art also fails to provide a truly effective bark utilization approach

The document "Research on the Technology of Manufacturing Pellet Fuel from Forestry Residues" records that the production of fuel from forestry residues such as wood chips and bark requires supplementary means such as high pressure and heating, and at the same time control the moisture content of the raw materials, otherwise the surface of the fuel will be severely heated. Decomposition, cracks, strength reduction and other defects, or even no molding, the process has strict requirements and high technical difficulty

[0006]Due to the complex composition of papermaking sludge and bark, and the large difference in physical form, it is difficult to use the two in terms of the current technical status

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