Wet sludge gasification treatment method capable of energy self-sustaining

Abstract

The invention discloses a wet sludge gasification treatment method capable of energy self-sustaining. The method comprises the following steps: S1. adding a high-carbon substance into sludge until the mass mixing ratio of the sludge to the high-carbon substance is (50-90):(50-10), uniformly mixing the sludge and high-carbon substance, and granulating to obtain a granular mixture with the granularity of less than 10mm; S2. sending the granular mixture into a circulating fluid bed gasification furnace through a screw conveyer, heating air to 700-750 DEG C by a heat exchanger, sending the heated air into the circulating fluid bed gasification furnace, and carrying out combustion gasification reaction on the granular mixture and hot air at the high temperature of 950-1050 DEG C, wherein the high-temperature fume generated after reaction flows into the heat exchanger to heat the inside air, and the fume subjected to heat exchange is subjected to dust separation to become clean fume which is used by customers. The method can implement system internal energy self-sustaining, and is capable of preventing secondary pollution and obviously lowering the sludge treatment cost.

Description

technical field [0001] The invention belongs to the technical field of sludge gasification, and in particular relates to an energy self-sustaining wet sludge gasification treatment method. Background technique [0002] With the development of my country's social economy and the acceleration of urbanization, the output of sludge is also increasing year by year. How to deal with sludge has become an urgent problem in the field of modern environmental protection. Traditional sludge treatment technologies such as landfill, agricultural fertilizer, and incineration all have their own defects, and it is difficult to achieve the ultimate goal of sludge reduction, stabilization, harmlessness, and resource utilization. [0003] In order to do a good job in the "four modernizations" of sludge treatment and disposal, a lot of efforts have been made at home and abroad, and some new technologies have also been developed. None of the technologies can be well developed in the country. Es...

AI Technical Summary

Problems solved by technology

[0005] At present, there are many patent achievements that mention sludge gasification, but the focus is on the link of by-product combustible gas. The whole system assists a large amount of external energy to remove water from sludge for sludge drying. Some systems even pre-dry the sludge to remove moisture, and then add water vapor as a gasification agent to participate in sludge gasification, which wastes a lot of energy in the sludge itself, which is very uneconomical

At the same time, the main purpose of the existing technology is to produce gas, so a large amount of energy is used to dry the sludge, otherwise too much water will affect the gas production efficiency and calorific value of the sludge

In fact, there is a deviation in application, because the gas produced is not necessarily easy to use, and it also takes a huge energy cost, which makes the cost of sludge treatment high

The use of by-product combustible gas may have certain limitations: because the CO content exceeds the requirements of urban gas, it cannot be used for residential gas; if it is used for industrial users, due to the large demand for gas, the sludge gasification of a sewage treatment plant is generally very slow. If it is difficult to meet the gas volume requirements, it is necessary to concentrate the sludge from multiple sewage treatment plants, which will inevitably lead to secondary pollution and cost increase in the sludge transportation process

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