Dew-point corrosion resistant residual heat recovering system

Abstract

The present invention discloses a dew point corrosion resistant waste head recovery system; a header pipe (14) is connected with a main pneumatic valve (18) and an auxiliary pneumatic valve (22) through the distributary of a booster pump (15); the main pneumatic valve (18) is connected to the heating end inlet of a temperature compensator (7) through a first valve (11); a heating end outlet of the temperature compensator (7) is connected to a heat exchange inlet of a thermotube heat exchanger (1) through a second valve (5) and a third valve (2); a heat exchange outlet of the thermotube heat exchanger (1) is connected with a cooling end inlet of the temperature compensator (7) through a fourth valve (4) and a fifth valve (6); the cooling end outlet of the temperature compensator (7) is connected with a mixer (21) through a seventh valve (12); the auxiliary pneumatic valve (22) is connected with the mixer (21) through an eighth valve (20); an outlet of the mixer (21) is connected with a sixth valve (25). The system has the function of self-temperature compensation of cold fluid and temperature adjustment of the heat exchanger wall, effectively solves the problem of low dew point corrosion of the heat exchanger, prolongs the life-span of the heat exchanger, recovers the waste head of low-temperature flue gas and achieves the effect of energy conservation and emission reduction.

Description

technical field [0001] The invention relates to an industrial kiln flue gas waste heat recovery system, in particular to a low-temperature flue gas waste heat recovery system. Background technique [0002] At present, the energy consumption per unit of major products in my country's eight industries of electric power, iron and steel, nonferrous metals, petrochemicals, building materials, chemicals, light industry, and textiles is 40% higher than the international advanced level on average. [0003] Statistics show that the total domestic industrial waste heat resources account for about 17% to 67% of the total fuel consumption. Among them, the waste heat of medium and low temperature flue gas accounts for about half of the waste heat resources of flue gas. However, the recycling rate of waste heat from medium and low-temperature exhaust gas in my country is low, especially for low-temperature flue gas below 250 °C. Due to the low-temperature dew point corrosion of equipment...

AI Technical Summary

Problems solved by technology

However, the recycling rate of waste heat from medium and low-temperature exhaust gas in my country is low, especially for low-temperature flue gas below 250 °C. Due to the low-temperature dew point corrosion of equipment and the short service life of heat exchangers, a large amount of waste heat resources are not recycled, resulting in The unit energy consumption of enterprise products is too high, and the production cost increases, which not only wastes energy, but also causes more serious environmental pollution problems

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