Complete-exhausting device and method for tail gas of yellow phosphorus electric furnace

Abstract

The invention discloses a complete-exhausting device and an exhaust method for the tail gas of a yellow phosphorus electric furnace. The complete-exhausting device for the tail gas of the yellow phosphorus electric furnace comprises a micropressure gas holder, wherein the micropressure gas holder is in serial connection or bypass connection between a tail gas pipeline of a scrubber phosphorus recovery tower of the yellow phosphorus electric furnace and a yellow phosphorus tail gas extractor; the micropressure gas holder is a wet gas holder and comprises a water channel and a bell jar arranged in the water channel, wherein the bell jar can vertically lift along a bell jar guide rail. According to the complete-exhausting device, the influence on the extraction of yellow phosphorus tail gas by the gas production rate of the yellow phosphorus electric furnace is eliminated by the self regulation of the volume of the micropressure gas holder in the system, the yellow phosphorus tail gas can be completely extracted, and the complete-exhausting device performs a function of stabilizing furnace pressure so as to avoid security accidents caused by the negative pressure of the yellow phosphorus electric furnace. The complete-exhausting device has the advantages of reasonable structure improvement, obvious economic performance of equipment, easiness in controlling and operating construction operation and high security.

Description

technical field [0001] The invention relates to an equipment for producing yellow phosphorus by an electric furnace method, in particular to a device for completely extracting yellow phosphorus electric furnace tail gas, and also relates to a method for extracting gas by using the device for completely extracting yellow phosphorus electric furnace tail gas. Background technique [0002] At present, in the production process of the yellow phosphorus industry, the biggest pollutant is yellow phosphorus tail gas. To realize the pollution control and emission reduction of yellow phosphorus tail gas, the first step is to extract the yellow phosphorus tail gas. The exhaust gas is directly extracted with an air pump before the water seal is emptied. The biggest problem with this extraction method is that it cannot extract 100% of the yellow phosphorus exhaust gas. It can only extract 85% of the total amount at most. No matter how high the extraction rate is, it will When the electr...

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Problems solved by technology

If all the tail gas produced by the electric furnace is pumped away by increasing the air extraction volume of the air extractor, and at the same time the exhaust pipe is completely closed, at this time, once there is material collapse in the furnace, within 1-2 seconds, the electric furnace will The exhaust volume increased significantly, and the air extractor did not have time to increase the air extraction volume. At this time, the air pressure in the furnace rose rapidly, resulting in the failure of the electrode water seal. The furnace gas is discharged at a high temperature, and a large fire is ignited. Immediately afterwards, the exhaust gas volume of the electric furnace drops sharply, and the speed of reducing the gas extraction volume of the air extractor cannot keep up. Negative pressure, the air enters the electric furnace from the gap of the charge particles, that is, an explosion may occur at any time

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