Loop circulating gas analysis method and appts. for determining sulfur constant of combustible material

Abstract

Electrolytic cell, filter and air chamber are setup on pipe connected to reaction furnace so as to form a closed loop. Opening and closing valve and pump on pipe controlled by controlling unit makes circulation of gas to be measured in pipe and air chamber. Extracting gas in constant volume in closed loop measures and calculates sulfur content. In the equipment, closed loop is formed: from reaction furnace, through external communicating pipe, two air chambers, gas valve, filter, electrolytic cell, pump back to reaction furnace. A bypass pipe is connected to inlet and outlet of second air chamber. Two valves are connected to the said bypass pipe, one is connected to reaction furnace, and another is connected to disposal of waste gases device. The invention raises measuring precision since even gas concentration is in chamber and pipe, requires low sensitivity of sensor.

Description

Technical field: [0001] The present invention relates to a method for measuring the sulfur content of solid or liquid combustible substances, in particular to a method for sampling samples for analysis using a closed loop method and a device designed by the method, mainly used in coal, petroleum, chemical industry , electric power, scientific research, teaching and other industries or departments. Background technique: [0002] At present, the sulfur determination instrument in the prior art adopts the coulometric method to measure the sulfur content in the sample, and the sulfur dioxide gas produced after the sample is burned in the reaction furnace first enters the filter through the pipeline connected to the inner cavity of the reaction furnace. Filtrate, then titrate in the electrolytic cell, and measure the sulfur content in the sample according to the electricity consumed by the electrogenerated iodine and electrobromine. During the test, the method of extracting gas w...

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Problems solved by technology

[0002] At present, the sulfur determination instrument in the prior art adopts the coulometric method to measure the sulfur content in the sample, and the sulfur dioxide gas produced after the sample is burned in the reaction furnace first enters the filter through the pipeline connected to the inner cavity of the reaction furnace. Filtrate, then titrate in the electrolytic cell, and measure the sulfur content in the sample according to the electricity consumed by the electrogenerated iodine and electrobromine. During the test, the method of extracting gas while burning is used. The gas needs to be extracted continuously, and the time distribution of the gas concentration is very uneven. Therefore, when the gas concentration is low, the sensitivity of the sensor probe is high, and it is difficult to perform accurate measurement.

This method has high requirements on the sensor probe and airflow stability, otherwise it will affect the accuracy of measurement

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