Glass-lined heat pipe low temperature economizer for deep recovery of waste heat from exhaust flue gas of power station boilers

Abstract

The invention discloses a low temperature economizer having glass-lined heat tubes and applicable to deep recovery of waste heat in station boiler exhaust. The low temperature economizer comprises a water tank, a fume tank, a partition and heat exchange tubes. The water tank and the fume tank are isolated by the partition and are both sealed. The glass-lined heat tubes are inserted into the partition and are hermetically fixed to the partition. The upper portions of the glass-lined heat tubes are located inside the water tank; the lower portions of the glass-lined heat tubes are located inside the fume tank. The inner wall of a base tube of each glass-lined heat tube is provided with a spiral groove filled with water-ethanol azeotropic mixture; each base tube made of a cold-drawn seamless steel tube is made into the glass-lined heat tube after subjected to the steps, such as surface sand blasting, electrostatic spraying of porcelain powder, lining burning at 850-870 DEG C, spark detection, medium filling and vacuum treatment; corrosion resistance and good heat conductivity are ensured, operational safety and reliability of equipment is ensured, fume gas waste heat is fully utilized, utilization efficiency of coal is increased, pollutant emission is reduced, desulfurization efficiency and equipment safety are guaranteed, and water resources are saved.

Description

technical field [0001] The invention relates to the field of industrial kilns, in particular to a glass-lined heat pipe low-temperature economizer for deeply recovering waste heat from exhaust gas of power plant boilers. Background technique [0002] Industrial boilers and kilns will produce a large amount of flue gas during the production process, which contains sulfur dioxide that forms acid rain and carbon dioxide that constitutes the greenhouse effect. . In recent years, the deterioration of our country's environment has aroused widespread attention at home and abroad, and a lot of manpower and material resources have been invested in the country's governance of the environment. [0003] The exhaust gas temperature of thermal power boilers is generally 140°C, and the exhaust gas temperature of other boilers can reach 180°C. Since the flue gas desulfurization temperature and the temperature required by the desulfurization device equipped with the boiler are lower than 8...

AI Technical Summary

Problems solved by technology

[0007] (2) The desulfurization of the 300MW unit requires an annual consumption of 175,200 tons of spray water due to the reduction of flue gas temperature, which also constitutes thermal pollution to the surrounding environment

[0009] In order to solve the problems of desulfurization efficiency and pollution waste of desulfurization equipment, some people propose to install a heat exchange device before the desulfurization tower to lower the temperature of the flue gas before it is discharged into the desulfurization tower, and at the same time make full use of the heat energy in the flue gas. , most of which are below the dew point, the sulfur in the flue gas will form acidic substances, and the acidic low-temperature flue gas will seriously corrode the heat exchange equipment, which makes this technology have major defects

[0010] Due to the existence of the above problems, the inventors conducted in-depth research on smoke exhaust and heat exchange equipment in order to solve the problem of pollution and waste of desulfurization equipment, and overcome the problem of corrosion of heat exchange equipment by acidic low-temperature flue gas

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