Novel chain boiler used during caustic soda production

Abstract

The invention discloses a novel chain boiler used during caustic soda production. The novel chain boiler comprises a boiler body, a pulverized coal grinding machine, an air inlet pipe, a waste gas output pipe, a waste gas recovery pipe and an air conveying device, the waste gas output pipe is connected to one end of the boiler body through bolts, one end of the waste gas recovery pipe is connectedto the waste gas output pipe, the other end of the waste gas recovery pipe is connected to the pulverized coal grinding machine through bolts, one end of the air conveying device is fixedly connectedto the pulverized coal grinding machine through the air inlet pipe, the other end of the air conveying device is connected to the lower end of the boiler body through a pipeline, wherein the boiler body comprises a hearth, a chain grate, an ash bucket, a chimney and an air preheater, the chain grate is connected to the upper end of the ash bucket through bolts, the hearth is welded to the upper end of the chain grate, the chimney is fixedly connected to the upper end of the hearth through bolts, and the air preheater is connected to the center of the interior of the chimney through bolts. According to the novel chain boiler used during caustic soda production, the combustion is uniform and sufficient, a large amount of heat in the tail gas can be recovered, and the emission is reduced.

Description

technical field [0001] The invention relates to a novel chain boiler in caustic soda production. Background technique [0002] In the production of caustic soda, impurities such as calcium, magnesium, and sulfate ions are removed by adding soda ash, caustic soda, and barium chloride refined preparations after the original salinized salt, and then sodium polyacrylate or causticized bran is added to the clarification tank to accelerate precipitation. After filtering, add hydrochloric acid to neutralize. After preheating, the brine is sent to electrolysis. The electrolyte is preheated, evaporated, separated into salt, and cooled to obtain liquid caustic soda, which is further boiled to obtain solid caustic soda. The salt mud washing water is used to melt the salt. In this series of steps, chain boilers will be used. [0003] The chain boiler is a layer fired furnace with a high degree of mechanization. [0004] It is named because the grate is similar to a chain crawler. It i...

AI Technical Summary

Problems solved by technology

Due to poor ignition conditions and manual operation to poke the fire, it is not suitable for burning coal with a lot of water, a lot of ash, and strong coking.

Another disadvantage of it is that it consumes a lot of metal

[0005] Today's chain boilers supply air through the warehouse or in sections, and the controllability of the air supply is relatively poor. Often, the air supply is less in the place where the wind is needed, and the air supply is larger in the place where a small amount of wind is needed, so the air supply is not enough. balanced

Moreover, there are many air leakage points in the ash hopper at the lower part of the grate, the furnace flue gas and the air are mixed unevenly, and even the volatiles cannot be completely burned. When the pulverized coal is transported from the pulverized coal grinder to the chain boiler, air is input at the same time, which increases the oxygen input in the furnace, resulting in excess oxygen and affecting the combustion of the chain boiler

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