Method for measuring temperature of rotary cement kiln and method and device for online detection of temperature field of rotary cement kiln

Abstract

The invention discloses a method for measuring the temperature of a rotary cement kiln and a method and device for online detection of the temperature field of the rotary cement kiln. The method for measuring the temperature of the rotary cement kiln comprises the steps that an offline calibration portion establishes a mapping relational table of gas phase each-component gas-solid absorption coefficient correction coefficients and the temperature by considering gas-solid two-phase radiation characteristics inside the rotary cement kiln; an online detection portion selects one set of gas-solid absorption coefficient correction coefficients from the mapping relational table obtained by the offline calibration portion by testing monochrome radiation intensity and gas phase component molar volume quotients, so that the calculated theoretical monochrome radiation intensity and the detected actual monochrome radiation intensity are closest, and the corresponding temperature is the temperature to be measured. The invention further discloses the method and device for online detection of the temperature field of the rotary cement kiln by applying the method for measuring the temperature. According to the method for measuring the temperature of the rotary cement kiln and the method and device for online detection of the temperature field of the rotary cement kiln, the measuring result is accurate, the temperature field inside the rotary cement kiln can be globally analyzed, excessive temperature of materials of a burning zone and deteriorating combustion conditions are avoided, and heating-power-type NOx emission caused by the excessively-high temperature is reduced.

Description

technical field [0001] The invention belongs to the field of cement rotary kiln temperature control, and more specifically relates to a cement rotary kiln temperature measurement method and an online temperature field detection method and device. Background technique [0002] The temperature field distribution in the cement rotary kiln is of great significance to the combustion efficiency of the rotary kiln and the pollutant emission of thermal NOx. On the premise of ensuring the quality of cement clinker, the combustion adjustment technology based on the controllable temperature field has always been the key technology restricting the development of the cement industry at home and abroad. [0003] A method for continuous temperature measurement of a cement rotary kiln is disclosed in Chinese Utility Model Patent Specification CN95216824. This method mainly uses a contact-type high-temperature thermocouple to measure the temperature at a certain point in the rotary kiln. I...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a cement rotary kiln temperature measurement method and an online temperature field detection method and device, the purpose of which is to accurately measure the flame temperature field in the furnace on-line, thereby solving the problem of the existing cement rotary kiln. The online field measurement method of the flame temperature in the rotary kiln cannot accurately measure the high Ca-based solid phase and high CO in the furnace 2 Technical issues with gas phase temperature

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