A method and system for online prediction of flue gas temperature in calcination section of rotary kiln

Abstract

The invention relates to a method and system for online prediction of flue gas temperature in the calcining section in a rotary kiln, which specifically includes the following steps: 二次风 , Q 燃 , Q 烟气 , Q 壁 and Q 物料 The heat balance model; calculate the Q in the heat balance model by the parameters when the rotary kiln works stably 壁 , Q 物料 and Q 二次风 value; the Q that will be obtained 壁 , Q 物料 and Q 二次风 Substituting the numerical value into the rotary kiln heat balance model in the step S1 to obtain Q 燃 and Q 烟气 The relational expression between, and then obtain the flue gas temperature t in the calcination section r and kiln tail flue gas temperature t y The relational expression; measure the kiln tail flue gas temperature t y , and through the calcination section flue gas temperature t r and kiln tail flue gas temperature t y The relational formula to obtain the flue gas temperature t in the calcination section r ; The heat balance model is specifically: Q 二次风 +Q 燃 =Q 烟气 +Q 壁 +Q 物料 . The beneficial effect of the invention is to effectively predict the temperature of the combustion section of the rotary kiln and provide theoretical support for the production of the rotary kiln.

Description

technical field [0001] The invention relates to the technical field of rotary kilns, in particular to a method and system for online prediction of flue gas temperature in a calcining section in a rotary kiln. Background technique [0002] Rotary kiln is a key equipment widely used in cement, metallurgy and other production links. The control of its internal temperature is directly related to the stable operation of the entire production line, product quality and production cost. The heat released by fuel combustion will produce a high temperature zone. For a pellet rotary kiln under stable operation, it is generally around 1350 degrees Celsius. This temperature is an extremely critical process parameter in production and is directly related to fuel consumption and pellet quality. , nitrogen oxide emissions and cylinder ring formation. However, the high-temperature flue gas temperature in the calcining section of the rotary kiln cannot be directly measured for three reasons:...

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Problems solved by technology

[0004] 2) The rotary kiln is working in a rotating state, and the calcining section is located in the kiln, so it is difficult for measuring tools to reach in;

[0005] 3) The fluid in the rotary kiln is in a state of rapid flow, generally around 20m / s, and even exceeds 50m / s at the nozzle, making measurement difficult

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