Conversion preheating device in sulfuric acid production

Abstract

The invention discloses a conversion preheating device in sulfuric acid production. The conversion preheating device consists of a process gas inlet (1), a process gas outlet (2), a high-temperature smoke gas inlet (3), a high-temperature smoke gas outlet (4), a heat pipe inner circulation heat exchange work medium (5), a separation plate (6), a heat pipe heat exchanger heat pipe (7) and a heat pipe exchanger pipe case (8), wherein the inside of the heat pipe exchanger pipe case (8) is separated into two parts by the separation plate (6), the lower part is a part for heating the work medium by high-temperature smoke gas, and the upper part is a part for heating process gas by the high-temperature work medium. The conversion preheating device has the effects and advantages that the high-temperature smoke gas side overhauling is convenient, the machine halt overhauling is not needed, the operation environment is good, the use cannot be influenced by the heat exchanger leakage, and in addition, poisonous and harmful gas cannot be easily leaked out.

Description

technical field [0001] The invention relates to the field of heating devices in the production technology of phosphorus chemical products, and in particular relates to a preheating device for in-transforming process gas in the process of producing acid from pyrite. Background technique [0002] In the production process of pyrite for acid production, at the initial stage of start-up, due to the low temperature in the converter, the process gas cannot be reacted directly into the converter. The heat exchanger is an ordinary shell-and-tube heat exchanger, which uses high-temperature flue gas to directly heat the process gas. The flue gas temperature is around 980°C, and the heat exchanger is often burned out. The process gas needs to be heated to 450°C. Under such high temperature conditions, it is difficult for the valve on the pipeline to completely cut off the gas, and sulfur dioxide (toxic and harmful gas) leaks into the heat exchanger, which cannot be overhauled in the dr...

AI Technical Summary

Problems solved by technology

[0002] During the production process of pyrite acid production, at the initial stage of start-up, due to the low temperature inside the converter, the process gas cannot react directly into the converter, so the process gas must be preheated to the temperature where sulfur dioxide can react (above 410 degrees), usually used The heat exchanger is an ordinary shell-and-tube heat exchanger, which uses high-temperature flue gas to directly heat the process gas. The temperature of the flue gas is about 980°C, and the heat exchanger is often burned out.

The process gas needs to be heated to 450°C. Under such high temperature conditions, it is difficult for the valves on the pipeline to completely cut off the gas. Sulfur dioxide (poisonous and harmful gas) leaks into the heat exchanger, which cannot be repaired while driving. If the maintenance is harmful to the workers Personal safety is not guaranteed, and a lot of time is wasted when parking for maintenance or adding blind partitions for maintenance, affecting normal production and causing major economic losses

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