Full reverse flow type heat recovery device

Abstract

The invention discloses a full reverse flow type heat recovery device. The heat recovery device comprises a shell extending in the axis direction, an inner cavity of the shell is divided into a heat exchange cavity and a water inlet cavity through a dividing tube plate, a heat exchange cylinder is arranged in the heat exchange cavity and comprises an air inlet cylinder and an inner cylinder which are connected together, and an air return cavity is formed between the heat exchange cylinder and the shell; a water return piece composed of an inner tube plate and an inner sealing head is arranged in the air inlet cylinder, and a water return cavity is formed between the inner tube plate and the inner sealing head; the end, facing the inner tube plate, of the inner cylinder is provided with an air inlet channel, and the inner cylinder communicates with the air inlet cylinder through the air inlet channel; an air outlet channel is formed in one end, facing the dividing tube plate, of the inner cylinder, and the inner cylinder communicates with the air return cavity through the air outlet channel; a tube nest is mounted in the heat exchange cylinder, one end of the tube nest communicates with the water return cavity through the inner tube plate, and the other end of the tube nest communicates with the water inlet cavity through the dividing tube plate; one end of a drain tube communicates with the water return cavity through the inner tube plate, and the other end of the drain tube is used as a refrigerant outlet. According to the heat recovery device, hydrogen corrosion can be reduced, the heat exchange efficiency can be improved, and the manufacturing cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical equipment, in particular to a full countercurrent heat recovery device. Background technique [0002] Tube and tube heat exchangers are widely used as conventional equipment for syngas heat recovery. Since the syngas contains high concentration of hydrogen, in order to avoid hydrogen corrosion of welds, it is necessary to use welding materials that are resistant to high temperature and strong hydrogen corrosion. , resulting in higher manufacturing costs of the heat exchanger and higher equipment maintenance costs. In addition, the structure of the tube-and-tube heat exchanger generally adopts a semi-counter-current structure, that is, only part of the heat exchange tube is for counter-flow heat exchange, while the other part is for forward-flow heat exchange, which reduces the heat exchange efficiency of the heat exchanger. Contents of the invention [0003] In order to improve the heat exchan...

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Problems solved by technology

[0002] Tube-and-tube heat exchangers are widely used as conventional equipment for syngas heat recovery. Due to the high concentration of hydrogen in the syngas, in order to avoid hydrogen corrosion of welds, it is necessary to use welding materials that are resistant to high temperature and strong hydrogen corrosion. , leading to higher production costs of heat exchangers and higher equipment maintenance costs

In addition, the structure of the tube-and-tube heat exchanger generally adopts a semi-counter-current structure, that is, only part of the heat exchange tube is a counter-flow heat exchange, while the other part is a downstream heat exchange, which reduces the heat exchange efficiency of the heat exchanger.

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