Novel efficient steam heater

Abstract

The invention discloses a novel efficient steam heater which comprises a cylinder and an expansion joint arranged on one side of the cylinder, wherein a pass partition plate is arranged in the middle of the cylinder; an inner pipe plate and an outer pipe plate are respectively arranged on end parts on the two sides of the cylinder; a bimetal rolled finned pipe is connected with the inner pipe plate through the expansion joint and is welded with the outer pipe plate; a steam inlet pipe box and a condensate outlet pipe box are respectively welded on the outer pipe plate; the outer pipe plate is provided with a 13mm pit in a pipe distributing area along an axial direction of a heat exchanger; the outer pipe plate is welded on the inner pipe plate; a 10mm shallow cavity is formed between the two pipe plates; and a scour-preventing baffle is welded at an adapter inlet of the steam inlet pipe box. The novel efficient steam heater has the advantages that the heat exchange efficiency is increased, the energy consumption is reduced, the cost is saved, the quality of products is increased, the manufacturing is more convenient and the property is more reliable.

Description

technical field [0001] The invention relates to a steam heater, in particular to a steam heater used in an air separation plant purification system. Background technique [0002] At present, most of the steam heaters used in the purification system of the air separation unit are of the horizontal double tube plate type. In the air separation unit, the raw air first flows through the molecular sieve adsorber, after being adsorbed and purified by the molecular sieve, a small amount of carbon dioxide, hydrocarbons and water vapor are removed, and then enters the plate-fin heat exchanger in the cold box to cool it to - At about 173°C, it finally enters the rectification tower for rectification. The dirty nitrogen gas drawn from the cold box enters the steam heater, is heated to about 180°C by high-temperature steam, and then enters the molecular sieve adsorber to regenerate the molecular sieve. The polluted nitrogen is heated by steam in the steam heater to the temperature req...

AI Technical Summary

Problems solved by technology

Due to the large anti-leakage cavity between the inner and outer tube sheets, the effective heat exchange length of the heat exchange tube is shortened, and the heat exchange area is reduced; secondly, the manufacturing difficulty is increased

Due to the large anti-leakage cavity between the inner and outer tube sheets, it is difficult to pass through the tubes during assembly. In actual assembly, in order to allow the heat exchange tubes to pass through the inner and outer tube sheets at the same time, hole expansion is often required, resulting in insufficient expansion joint strength of the inner tube sheets; in addition, With the expansion of the project, the heat exchange equipment is getting bigger and bigger, and the number of heat exchange tubes is also increasing. Sometimes the number of heat exchange tubes in a single equipment is as high as four to five thousand, and the processing and manufacturing are more difficult.

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