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A Study of High Temperature Measurement Technology for Gasifier Based on Heat Conduction

Author: ZhaoMeng
Tutor: LiuHaiFeng
School: East China University of Science and Technology
Course: Chemical processes
Keywords: gasifier temperature measurement heat conduction probe
CLC: TQ546
Type: Master's thesis
Year: 2011
Downloads: 83
Quote: 0
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Abstract


Because of the high temperature molten slag and gas flow, temperature measurement in an entrained-flow gasifier becomes very difficult. A simple and accurate method to measure the furnace temperature is required urgently in gasification industry. Based on one dimensional heat conduction, a probe with gas sweeping and water cooling structure was designed to measure the high temperature in entrained flow gasifier. The probe contains nitrogen purge and water cooling structure, which can guarant the clean of the top and extended the life of the probe.Through the analysis of heat transfer process of the probe, the temperature measurment formula was deduced, and the constant in the formula was calibrated by using experimental data in blackbody furnace. It was verified in a experimental membrane wall gasifier by using diesel, coal and slag as fuel, and the results showed that the probe could measure the furnace temperature accurately. And the method is suit for the gasifier temperature measurement. The transient heat transfer of measuring probe was calculated, and its characterisitic response time was estimated. At the same time, the parameters sensitivity of formula was analyzed. Finally, computational fluid dynamics method is used to simulate purging effect under different velocity and angle, which provided a basis for industrial application and optimization of the probe.

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CLC: > Industrial Technology > Chemical Industry > Coal gasification industry > Gasification process
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