Municipal sludge clean incineration method and system

Abstract

The invention discloses a municipal sludge clean incineration method and system. The municipal sludge clean incineration system comprises a sludge slurry-making system, a slurry liquid conveying pump,a slurry storage tank, a stokehole conveying pump and a sludge combustion-supporting furnace which are connected in sequence, wherein the sludge combustion-supporting furnace is provided with a slagflowing port at the bottom and a flue gas outlet at the top, and the flue gas outlet is sequentially connected with a bag-type dust collector, an induced draft fan, a desulfurizing tower and a chimney. According to the municipal sludge clean incineration method, sludge is prepared into slurry in the sludge slurry-making system, the slurry is conveyed to the slurry storage tank through the slurry liquid conveying pump and then conveyed into the sludge combustion-supporting furnace through the stokehole conveying pump to be combusted, and flue gas generated by the sludge combustion-supporting furnace is dedusted through the bag-type dust collector, then conveyed into the desulfurization tower through the induced draft fan to be desulfurized, and finally discharged through the chimney in a standard reaching mode. The municipal sludge clean incineration method and system has the advantages of simple process, energy saving, environmental protection, investment and operation cost reduction,effective control over solid waste pollutant discharge, environmental protection, and high sludge blending combustion amount.

Description

technical field [0001] The invention relates to the field of solid waste pollutant treatment, in particular to a clean incineration method and system for urban sludge. Background technique [0002] In recent years, with the continuous improvement of people's awareness of environmental protection, the treatment rate of urban domestic sewage and industrial wastewater is also increasing. The quality of residual sludge, the secondary pollutant produced in the process of sewage treatment, is also increasing, which brings new problems to environmental protection. The sludge of urban sewage treatment plants contains a large amount of organic matter and rich in nutrients. In addition, the sludge also contains a large number of pathogenic microorganisms and heavy metals. At present, the commonly used sludge treatment methods are: sludge landfill treatment method, sludge incineration treatment method, sludge digestion treatment method, and sludge land use. Among them, sludge inciner...

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Problems solved by technology

Since the bed temperature of the fluidized bed is only 850-950°C, dioxin gas will be produced when the furnace temperature drops due to the wet sludge, so the amount of blended combustion is very small and less than 10% of the fuel, mainly dry sludge, and the sludge is dry The cost is still very high, and because the bed temperature is not very high, there is still unburned sludge in the fly ash, and the heavy metals in the sludge will cause the pollutant indicators of the fly ash to exceed the standard, and dioxins also exist in the flue gas Possibility of exceeding the standard

Although the temperature of the cement rotary kiln is very high, the composition of the cement may change due to the complex composition of the sludge, and it is not worth promoting.

According to incomplete statistics, at present, only a small part of the sludge from urban sewage treatment plants in the country is used for sanitary landfill, land use, incineration and building material utilization, while most of it has not been treated in a standardized manner.

Sludge contains toxic and harmful substances such as pathogens, heavy metals, and persistent organic matter. Without effective treatment and disposal, it is very easy to cause secondary pollution to groundwater and soil, directly threatening environmental safety and public health, and greatly reducing the environmental benefits of sewage treatment facilities.

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