Method for producing energy-saving environmentally-friendly coal by using sludge

Abstract

The invention discloses a method for producing energy-saving environmentally-friendly coal by using sludge. The method comprises the following steps of: deodorizing dewatered sludge with waste acid and lime, adding additives such as crushed raw coal, alumina, magnesium hydroxide, glass dust and the like in a certain percentage by weight, mixing and stirring uniformly; stacking for fermenting at normal temperature; and after fermentation is finished, shaping and drying by baking to obtain the energy-saving environmentally-friendly coal. According to the method, sludge treatment and coal energy conservation and emission reduction technologies are combined, the heat and the stickiness of sludge can be used effectively, the combustion ratio of raw coal can be increased to more than 98%, the difficult of sludge treatment is solved better, and the energy-saving environmentally-friendly coal can be provided. The method has the advantages of large sludge treatment quantity, high treatment speed, no pollution in the production process, simple process and low treatment cost, can be used for creating great economic benefit and social benefit and has a high comprehensive utilization value and a sustainable development prospect.

Description

technical field [0001] The invention relates to a method for treating sludge, in particular to a method for producing energy-saving and environment-friendly briquettes by using sludge. Background technique [0002] Many countries in the world have the problem of difficult disposal of a large amount of sludge and river sludge produced after sewage treatment. At present, most countries adopt the method of landfilling and incineration of sludge. Sludge landfilling not only wastes money, but also wastes a lot of land and energy; sludge incineration often causes air pollution again, causing serious secondary pollution problems, and the treatment cost is high, which is not environmentally friendly. If a large amount of sludge is not handled properly, it will pose a huge threat to human living environment and physical health. At present, it is difficult to find a treatment method that can achieve the best of both worlds. The disposal and utilization of sludge has become an importan...

AI Technical Summary

Problems solved by technology

However, after drying the sludge and mixing it with coal as fuel, although the sludge can be comprehensively utilized, the treatment cost is high, and there will also be secondary pollution to varying degrees during the drying process, so this disposal method There are certain limitations in practical application

[0004] In addition, related studies have proposed a high-concentration sludge coal slurry (Chinese patent 200610030071.1), which is made of coal powder, aqueous sludge, additives, and sludge modifiers in a certain proportion. It can be used as a fuel for combustion or gasification, and to a certain extent realizes the full utilization of the sludge calorific value and some problems of high energy consumption in the existing sludge treatment process, but the high-concentration sludge coal slurry In the preparation method, as one of the components, the water-containing sludge is used in a relatively small amount in the formula, while the amount of coal powder is relatively large. Relatively speaking, the water-containing sludge is only used as a production aid for the high-concentration sludge coal slurry The use of chemical agent, to a certain extent, results in higher cost and unsatisfactory coal-saving effect