Environment-friendly garbage incineration process and matched device

Abstract

The invention discloses an environment-friendly garbage incineration process and a matched device. The process includes that when block-shaped biomass fuel burns on the lower portion of a combustion chamber, garbage to be incinerated and powder biomass fuel to be incinerated are fed from the upper portion of the combustion chamber, during the falling process, combustible gas produced by primary combustion and decomposition of the powder biomass fuel and the block-shaped biomass fuel is mixed with secondary air of a boiler, so that high-temperature flue gas is produced through secondary combustion, and garbage entering the combustion chamber from a garbage feed inlet is pre-heated and combusted through the high-temperature flue gas so as to decompose dioxin precursor in the garbage and dioxin produced in the incineration process. Further, light oxide ash content with large quantities of pores is produced due to suspension combustion and semi-suspension combustion of the biomass fuel in the combustion chamber, suspends in the combustion chamber and then makes contact with acid gas produced by garbage incineration to form salt. The combustion characteristics of the biomass fuel are reasonably used, the problem of secondary pollution caused by garbage combustion is effectively solved, and favorable conditions are created for development of garbage power in middle-sized and small cities and solving of environment problems brought by garbage processing and open burning of straws in rural areas.

Description

technical field [0001] The invention relates to a garbage incineration process and its supporting implementation device. Background technique [0002] The incineration of garbage is to protect the environment and provide us with energy at the same time. However, the existing domestic and foreign garbage incineration technologies pose a huge threat to the environment and human health due to secondary pollution caused by dioxins and acid gases produced during the incineration process. , and even the phenomenon of cancer villages around the waste incineration power plants, making the use of waste incineration technology criticized by the surrounding people, which has become the biggest reason hindering its development. [0003] There are three main categories of existing waste incineration technologies: grate combustion technology, fluidized bed combustion technology and rotary combustion technology. Its disadvantages are as follows: First, regardless of the combustion technol...

AI Technical Summary

Problems solved by technology

Its disadvantages are as follows: First, regardless of the combustion technology that uses a single garbage as fuel or the combustion technology that uses garbage and coal as fuel, due to the low calorific value of garbage, there is less combustible gas that can be decomposed after primary combustion and can be combusted again. Coal is a fuel mainly for carbon fixation, and it contains not much volatile matter that can be combusted again, which causes the temperature of boilers based on grate combustion technology to be low during secondary combustion ( Generally no more than 800°C) and boilers based on circulating fluidized bed combustion technology have a very short secondary combustion time (less than 1 second), so they cannot effectively decompose harmful substances such as dioxins produced by waste incineration

Second, limestone powder is added to absorb harmful elements in the acid gas produced by waste incineration during boiler operation. Because limestone powder has a large specificity and small surface area, it cannot be suspended stably and evenly in the furnace, and the contact time with harmful gases is short. The effect is also limited. , and the mechanism is complex and the operating cost is high

Third, the use of grate combustion technology also has the disadvantages of complex garbage components, different combustion calorific values, different specific gravity, and some plastics are still viscous after melting, which makes it difficult to burn out.

The rotary combustion technology basically has no market application value

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