Anti-low-temperature corrosion system and method of heat exchanger based on fuel characteristic

Abstract

The invention relates to a heat exchanger low temperature erosion prevention system based on fuel characteristic and a method thereof, relating to waste heat utilization technique field, solving the technique problem of waste heat utilization low temperature fume containing corrosive gas. The erosion prevention method of the heat exchanger comprises following steps: 1. fume characteristic data isinput into a microcomputer processing system by a fume characteristic module, wherein a fume dew point temperature calculation model is provided in the microcomputer processing system and can calculate fume dew point temperature based on the fume characteristic data provided by the fume characteristic module; 2. signal data of a temperature sensor on the wall at the entrance of the heat exchangeris respectively input into a microcomputer system which compares fume dew point temperature t1d calculated by the first step with the signal data of the temperature sensor on the wall at the entranceof the heat exchanger; 3. a temperature adjusting valve set is adjusted according to the comparison result to obtain the most economic and safest wall temperature of the heat exchanger. The inventionis provided with advantages of improving fume utilization efficiency and effectively preventing low temperature erosion of the system.

Description

technical field [0001] The invention relates to waste heat utilization technology, in particular to a method for automatically preventing low-temperature corrosion of heat exchangers applicable to waste heat utilization of low-temperature flue gas containing corrosive gases in electric power, metallurgy, petrochemical and other industries. Background technique [0002] High energy-consuming industries such as metallurgy, petrochemical and other industries vigorously implement waste heat recovery technology of exhaust gas, which is an effective way to alleviate the current energy shortage. Heat exchanger is an important equipment for waste heat recovery, accounting for about 20% of the investment cost of plant construction and 40% of the total weight of process equipment. During production and operation, due to corrosion, erosion, etc., the heat exchanger is damaged, the service life is shortened, and huge economic losses are caused. According to statistics, the petrochemica...

AI Technical Summary

Problems solved by technology

Low-temperature corrosion is characterized by uniform corrosion, which gradually reduces the thickness of the tube wall and even breaks it, which is extremely harmful to the safe operation of heat exchange equipment.

Due to the high dew point of the flue gas, if the wall temperature of the heat exchange tube cannot be effectively guaranteed to be lower than the dew point temperature, it is easy to cause low temperature corrosion of the heat exchanger

Images