Built-in vortex combustion device and combustion system for disposing RDF through cement decomposing furnace

Abstract

The invention discloses a built-in vortex combustion device and a combustion system for disposing RDF through a cement decomposing furnace. The built-in vortex combustion device comprises a first barrel and a second barrel, and the second barrel is connected to the upper portion of the first barrel and communicates with the first barrel; the second barrel is of a cylindrical structure with a volute, and a plurality of tertiary air inlets are evenly distributed in the rotary cutting line of the volute. A plurality of RDF feeding ports are formed in the top surface of the second barrel; and a preheated raw material feeding opening is formed in the top surface of the second barrel body and is positioned on the outer side of the tertiary air inlet. The RDF can be in a suspended state in the vortex combustion device, the combustion speed is far higher than stacking combustion, the vortex combustion device is arranged to be of a built-in structure, and tertiary air does not need to be introduced independently.

Description

technical field [0001] The invention relates to the field of cement production and the application of alternative fuels, in particular to a built-in vortex combustion device and a combustion system for treating RDF in a cement decomposition furnace. Background technique [0002] At present, the use of refuse-derived fuel (RDF) as an alternative fuel for cement calciners is becoming more and more widely used, and more and more cement plants are beginning to use RDF as fuel for cement calciners, partially or completely replacing traditional fossil fuel coal. Based on cost considerations, RDF is generally pretreated by sorting and crushing municipal solid waste. Its moisture content is high, its calorific value and ash content fluctuate greatly, and the quality of RDF is low. It is used as a substitute for cement calciner. Fuel has a great impact on the stable operation of the firing system and the production and quality of clinker, resulting in a generally low fuel substitutio...

AI Technical Summary

Problems solved by technology

Based on cost considerations, RDF is generally pretreated by sorting and crushing municipal solid waste. Its moisture content is high, its calorific value and ash content fluctuate greatly, and the quality of RDF is low. It is used as a substitute for cement calciner. Fuel, which has a great impact on the stable operation of the firing system and clinker production and quality, resulting in a generally low fuel substitution rate

[0003] The existing devices used for cement decomposition furnace to replace fuel RDF combustion mainly include F.L.Smidth's HOTDISC hot plate furnace, ThyssenKrupp's PREPOL-SC ladder furnace, KHD's etc. Compared with the cement calciner, they are all external, and the following problems generally exist in the use of external pre-combustion devices: (1) RDF is mainly piled up in the pre-combustion device, and the combustion speed is slow, which affects the RDF disposal capacity ; (2) A tertiary air needs to be introduced separately, which will affect the wind control and operation stability of the cement clinker burning system; (3) The ash generated after combustion enters into decomposition in a discontinuous or stranding manner furnace, it is easy to cause fluctuations in the operating conditions of the system; (4) The structure of the device is complex, the weight and space occupied are large, the system is complicated, and the cost is high

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