Cement kiln collaborative incineration alternative fuel system and process principle thereof

Abstract

The invention relates to a cement kiln collaborative incineration alternative fuel system and a process principle thereof, the cement kiln collaborative incineration alternative fuel system comprises a decomposing furnace (1), a rotary kiln (2), a kiln head cover (3) and a cooling machine (5), the decomposing furnace (1), the rotary kiln (2) and the cooling machine (5) are sequentially connected along a material trend, and the kiln head cover (3) is arranged at a discharge end of the rotary kiln (2) and is connected with the decomposing furnace (1) through a tertiary air pipe (4); the system further comprises an incinerator (6) and a tertiary air pipe branch (11), a feeding port (9) and a high-temperature hot air port (12) are formed in the front section of the incinerator (6), the high-temperature hot air port (12) is located below the feeding port (9) and communicated with the tertiary air pipe (4), an ash outlet (7) and a smoke outlet (8) are formed in the rear section of the incinerator (6), and the smoke outlet (8) is connected with the decomposing furnace (1). A bottom plate (10) is arranged in the incinerator (6); the bottom plate (10) comprises a step ventilation bottom plate (10-1) at the front section and a step non-ventilation bottom plate (10-2) at the rear section; the alternative fuel achieves controllable combustion in the incinerator and optimized butt joint with the kiln system, the utilization rate of the alternative fuel can be increased, and the negative influence on the kiln system is reduced.

Description

Technical field [0001] The present invention relates to a cement kiln coordinated incineration replacement fuel system and its process principle. Background technique [0002] With the acceleration of modern industrial development and urbanization, the amount of waste is increasing year by year, the harm to the human environment is increasing, and the waste treatment has become a universal concern in the world; the cement kiln system has high treatment temperatures, Long burning time, alkaline ambient atmosphere, no waste slag discharge, curable weight metal ions, etc., is an ideal place for disposing waste; flammable products having higher thermal values ​​in waste can be used as an alternative fuel of cement kiln systems; non-combustible The chemical composition of the chemical composition is approximately the chemical composition of cement raw materials, and it can be used as cement raw materials to prepare cement clinker and cement, and the cement kiln system synergy to dispo...

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Problems solved by technology

[0005] The above methods can assist the cement kiln to dispose of waste or use alternative fuels to reduce the impact on the cement kiln system, but each has its own disadvantages; although the grate furnace can achieve efficient combustion and burnout of alternative fuels, when replacing When the calorific value of the fuel is high, the combustion temperature and flue gas temperature in the incinerator are also high. Once the coking and liquid phase formation temperature of the ash is exceeded, it will cause the grate of the grate furnace to stick and block, thereby making it unable to operate normally. ; When working in conjunction with the calciner of the cement kiln system, the higher flue gas temperature will pass into the calciner, which will cause the local temperature in the calciner to be too high, resulting in local crusting, and it cannot be sprinkled with raw materials like other incinerators. powder to reduce the temperature (the grate may be blocked by powder, and the dust disorder in the incineration furnace may affect the combustion of alternative fuels); the tube furnace is limited by the wind speed in the pipeline, so it cannot adapt to the alternative fuel with larger particle size and larger bulk density. Once the hot air cannot suspend the alternative fuel, the alternative fuel will sink to the bottom, resulting in local accumulation of the alternative fuel, which makes the tube furnace unable to operate normally; the hot plate furnace realizes the combustion and burnout of the alternative fuel through the slow rotation of the turntable. Both tertiary air and raw meal powder can be fed into the hot plate furnace, which can adjust the combustion temperature and flue gas temperature of the alternative fuel. Because the turntable rotates slowly, its processing capacity is greatly affected by the specification of the hot plate furnace, and a large amount of alternative fuel can be processed. , a hot plate furnace with a larger volume and specification is required, and the investment is higher. Since the hot plate furnace and the calciner are completely connected, large unburned or non-combustible materials will fall into the rotary furnace after falling into the calciner from the hot plate furnace. In the kiln, thus affecting the calcination of clinker in the kiln

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