Composite tube air preheater

Abstract

The invention relates to a heat exchange technology, in particular to a composite tube air preheater. The composite tube air preheater is characterized in that a preheating box body which consists of carborundum tubes and contains air collection and distribution is used as a gas inlet end channel of a high-temperature smoke gas, a metal tube type preheating box body is used as a gas outlet end channel of the high-temperature smoke gas, and a high-temperature smoke tube and a high-temperature joint are connected in series with the carborundum tube preheating box body and the metal tube type preheating box body to exhaust the smoke gas with reduced temperature; the metal tube type preheating box body is used as an air inlet end channel of the combustion air of a combustor, the preheating box body which consists of the carborundum tubes is used as an air outlet end channel of the combustion air, and a high-temperature air duct and the high-temperature joint are connected in series with the metal tube type preheating box body and the carborundum tube preheating box body to exhaust the preheated combustion air. The invention adopts two independent preheating systems: the high-temperature smoke gas firstly passes through the carborundum tube preheating box body and then reaches an aluminizing tube box body, and the combustion air at normal temperature firstly passes through the aluminizing tube box body and then reaches the carborundum tube preheating box body; and in addition, the invention combines the advantages of high preheating temperature of the combustion air of a heat accumulator preheater and simple structure of a dividing wall type preheater.

Description

technical field [0001] The utility model relates to heat exchange technology, in particular to a composite tube air preheater. Background technique [0002] my country's furnace type structure, technology and operation management are relatively backward, the degree of effective energy utilization is low, and the energy-saving potential of industrial furnaces is very huge. In order to reduce fuel consumption, in addition to full-load production and maximum furnace productivity, it is also necessary to reduce the heat storage and heat dissipation losses of the furnace masonry, as well as the heat loss taken away by high-temperature flue gas. The temperature of the flue gas discharged from the furnace is as high as 600-1200°C in the industrial furnaces commonly used by domestic enterprises, accounting for about 30-60% of the heat supplied to the furnace, which makes the actual thermal efficiency of the furnace work low. Some enterprises have used simple air preheaters to recov...

AI Technical Summary

Problems solved by technology

Disadvantages: high production cost, large volume, complex structure; unstable air excess coefficient; frequent replacement of heat storage body, high maintenance cost; partition air preheater: means that the flue gas continuously transfers heat through the solid wall Combustion air preheater; advantages: simple structure, easy operation; self-contained system, independent of other processes; disadvantages: not suitable for large furnaces, short service life; gas-gas heat transfer effect is poor (preheating air temperature ≤ 400°C)

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