Low-temperature-corrosion-resistant smoke waste heat exchanger and heat exchange system based on same

Abstract

The invention discloses a low-temperature-corrosion-resistant smoke waste heat exchanger and belongs to the fields of smoke waste heat utilization and low-temperature-corrosion-resistant design. The low-temperature-corrosion-resistant smoke waste heat exchanger comprises a shell and finned tubes; the upper part of the shell is provided with a water outlet header, and the lower part of the shell is provided with a water inlet header; and straight tube sections of the finned tubes are arranged in the shell, bent tube sections of the finned tubes extend out of the shell, grooves are formed in the bottoms of the straight tube sections of the finned tubes, and a plurality of smoke flow guide blocks are densely distributed among the straight tube sections of every two adjacent finned tubes and along the axial directions of the finned tubes. The thermal stress and structural strength are calculated to meet the requirement of a project, in addition, the heat exchange efficiency can be increased to a certain extent, and the low-temperature-corrosion-resistant smoke waste heat exchanger has an obvious industrial application value.

Description

technical field [0001] The invention belongs to the fields of flue gas waste heat utilization and low-temperature corrosion prevention design, and in particular relates to a low-temperature corrosion-proof flue gas waste heat exchanger. Background technique [0002] Energy conservation and emission reduction is a long-term strategic policy of my country's economic and social development. In order to reduce emissions, large and medium-sized cities in my country have adopted the method of central heating with gas, but according to the existing national standards, for the sake of equipment safety, the exhaust gas temperature of the boiler is 150-180 ℃, and the heat loss of gas boiler flue gas Seriously, it affects energy utilization efficiency, so recovering waste heat from flue gas to reduce energy consumption is of great practical significance to my country's energy-saving and emission-reduction strategy. Taking urban heating in Xi'an as an example, if the exhaust gas tempera...

AI Technical Summary

Problems solved by technology

The second is the problem of low-temperature corrosion. The water vapor and sulfuric acid vapor in the flue gas enter the low-temperature heating surface, contact the metal of the lower-temperature heating surface, and may condense to cause corrosion on the metal wall. The corrosion rate is affected by the sulfur content of the fuel. air volume, excess air coefficient, metal temperature on the heating surface, flue gas temperature, dust accumulation and slagging

However, each measure has its restrictive factors. Once the suppression effect fails, the heat exchange tubes are prone to serious safety accidents such as perforation and leakage.

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