Dew-point corrosion resistant residual heat recovering system

Abstract

The invention discloses an anti-dew point corrosion waste heat recovery system. The main pipe (14) is connected with a main pneumatic valve (18) and a secondary pneumatic valve (22) through a booster pump (15). The main pneumatic valve (18) passes through the first The valve (11) is connected to the inlet of the heating end of the temperature compensator (7), and the outlet of the heating end of the temperature compensator (7) is connected to the heat pipe heat exchanger (1) through the second valve (5) and the third valve (2) for heat exchange The inlet, the heat exchange outlet of the heat pipe heat exchanger (1) are connected to the inlet of the cooling end of the temperature compensator (7) through the fourth valve (4) and the fifth valve (6), and the outlet of the cooling end of the temperature compensator (7) passes through the fourth valve (4) and the fifth valve (6). The seven valves (12) are connected with a mixer (21), the auxiliary pneumatic valve (22) is connected with the mixer (21) through the eighth valve (20), and the outlet of the mixer (21) is connected with the sixth valve (25). This system has the functions of cold fluid temperature self-compensation and heat exchanger wall temperature adjustment, which effectively solves the problem of low-temperature dew point corrosion of the heat exchanger, prolongs the service life of the heat exchanger, and can efficiently recover the waste heat of low-temperature flue gas, achieving the effect of energy saving 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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