Safety control mechanism for powdered coal gasifier

Abstract

The invention relates to a safety control mechanism for a powdered coal gasifier, which comprises a gasifier shell, a synthesis gas cooler shell and a steam dome. A gasifier water cooling wall is arranged in the gasifier shell, a synthesis gas cooler steam generator is arranged in the synthesis gas cooler shell, and the steam dome is internally provided with a steam dome separator which separates the steam dome into two chambers, i.e. a steam dome gasifier steam separating chamber and a steam dome synthesis gas cooler steam separating chamber. The safety control mechanism for a powdered coal gasifier is characterized in that a steam pipe from the steam dome gasifier steam separating chamber is equipped with a steam meter used for measuring the steam yield of the gasifier water cooling wall and capable of directly reflecting operating conditions of internal parts in a gasifier, and the steam meter can be connected with a safety interlocking system. Compared with the prior art, the safety control mechanism for a powdered coal gasifier can visually and timely detect the temperature change condition of the gasifier water cooling wall and cut off the supply of reaction material flow in time when steam flow reaches an interlocking value, thereby avoiding the further deterioration of the operating condition of the gasifier.

Description

technical field [0001] The invention relates to a safety control mechanism for a pulverized coal gasifier. Background technique [0002] In pulverized coal gasifiers with water-cooled walls, the gasification temperature of the gasifier is mostly above 1500°C, and the central temperature is as high as 1800°C to 2000°C. There is no suitable temperature measuring element to measure such a high temperature directly. Gasifier temperature. At present, the measurement of gasifier temperature is obtained indirectly through calculation after online measurement of syngas composition, gasifier and waste boiler steam production, chilled gas flow, temperature and other parameters downstream of the gasifier. Among the above measurement items, the measurement of syngas components is the most critical and has the slowest lag; this is because syngas comes from the gasifier reaction chamber and needs to pass through the gasifier waste heat boiler, fly ash filter, scrubber, and the above The...

AI Technical Summary

Problems solved by technology

However, in the current technology, the furnace temperature of the gasifier cannot be directly measured, and the temperature of the reaction chamber of the gasifier obtained by indirect measurement through calculation lags behind and is not accurate enough.

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