Recycling process for waste furnace slag in fluidized bed boiler combustion system

A fluidized bed boiler and combustion system technology, applied in fluidized bed combustion equipment, fuels burned in a molten state, combustion methods, etc., can solve problems such as energy waste, environmental pollution, and high carbon content in slag, and achieve increased Effectiveness, saving coal resources, reducing environmental pollution and resource waste

CN103411212AActive Publication Date: 2013-11-27太原钢铁(集团)有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-11-27

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Abstract

The invention relates to a process method and equipment for recycling waste furnace slag in a fluidized bed boiler combustion system. The process method comprises the following steps of (1) analyzing the low caloric value of the waste furnace slag, and judging the combustibility of the waste furnace slag; (2) uniformly proportioning and mixing coal and the combustible waste furnace slag as required, and loading materials to a circulating fluidized bed loading system; (3) setting parameters such as primary air openness, current, induced air openness, the air pressure of an air chamber, primary air amount, primary air pressure and the smoke pressure of an induced air inlet according to the different thicknesses of backing materials; and (4) combusting a coal slag mixture in a circulating fluidized bed boiler according to the parameters which are set in the step (3). By the adoption of the process method for recycling the waste furnace slag in the fluidized bed boiler combustion system and the fluidized bed boiler system corresponding to the process, a great number of coal resources can be saved, the environmental pollution is alleviated, the resource wasting is reduced, the benefit is improved, waste materials are changed into profitable materials, and energy conservation and emission reduction are realized.
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Description

technical field

[0001] The invention relates to a recycling process of waste slag, in particular to a recycling process of waste slag in a fluidized bed boiler combustion system. Background technique

[0002] At present, the carbon content of domestic chain boiler waste slag remains high, resulting in a large amount of energy waste. At the same time, it also needs to be discharged and cause environmental pollution. Only some enterprises use the slag for secondary use in building materials, and the nearby waste slag is used for secondary investment. The process of co-firing circulating fluidized bed boilers and raw coal has not been widely used. Usually, cars are used to transport them to designated places and dump them, and then bury them. This method not only consumes fuel, but also causes damage to the surrounding environment. environmental pollution.

[0003] Therefore, how to reutilize the piled up waste furnace slag nearby to save energy and protect the environment is ...

Examples

Embodiment Construction

[0027] In order to better understand the purpose, structural features and functions of the present invention, the process of reusing waste slag in the combustion system of the fluidized bed boiler described in the present invention will be described in detail below in conjunction with the background of the present invention, drawings and actual working conditions describe.

[0028] First, analyze the combustibility of waste coal slag to determine the feasibility of burning and reusing slag. Generally, those skilled in the art regard waste slag with a low calorific value lower than 2200 kcal as non-reburnable slag; Table 1 below Table 2 and Table 2 respectively show the calorific value analysis results of the 10-ton chain boiler slag and the 20-ton chain boiler slag by the iron ore metrology and inspection department. The average calorific value of the boiler slag is 2924.1 kcal, that is, the calorific value of the 10-ton chain boiler slag and the 20-ton chain boiler slag are b...