Tube-shell type heat exchange unit

Abstract

The invention discloses a tube-shell type heat exchange unit. The tube-shell type heat exchange unit comprises an internal system and an external structure. The internal system comprises an intelligent control center, a temperature measurement unit, a flow measurement unit and an amount control unit. The external structure comprises a base, an electric regulating valve, a tube-shell type heat exchanger, a primary side inlet, a secondary side inlet, a primary side outlet, a secondary side outlet, a plurality of flow meters, a plurality of pressure sensors, a plurality of temperature sensors, a plurality of valves, a circulation pump and a water supplementation pump. The tube-shell type heat exchanger comprises a shell stroke and a tube stroke. The tube-shell type heat exchange unit is suitable for steam-water heat exchange with phase changes, the electric regulating valve 111 is located on one side of the primary side outlet and used for controlling the amount of low-temperature water at the secondary side, the liquid temperature obtained after heat exchange can reach the assigned temperature, and the regulating method is stable and can save more energy compared with a traditional regulating method.

Description

technical field [0001] The invention relates to the field of heat exchange units, in particular to the field of shell-and-tube heat exchange units. Background technique [0002] Shell and tube heat exchangers are also called shell and tube heat exchangers. It is a partitioned wall heat exchanger that uses the wall of the tube bundle enclosed in the shell as the heat transfer surface. This kind of heat exchanger has a relatively simple structure and reliable operation. It can be made of various structural materials (mainly metal materials), and can be used under high temperature and high pressure. It is the most widely used type at present. [0003] The existing shell-and-tube heat exchanger unit belongs to the steam-side control type. When controlling the flow rate of the heat medium liquid and refrigerant liquid for heat exchange, the temperature of the liquid at the outlet of the secondary side is detected, so that the heat medium liquid is controlled by a regulating valv...

AI Technical Summary

Problems solved by technology

However, in actual operation, the heat medium is generally in a steam state. When the opening of the steam regulating valve is small, there is a large throttling loss, and the valve adjustment accuracy is low at low flow; the throttling causes the temperature to drop, which also reduces the transmission The difference in heat temperature leads to a decrease in heat transfer efficiency. At the same time, the operating pressure decreases after steam throttling, which will cause loss of pressure and pressure loss, and cause soda impact, which affects safety.

Traps require a large pressure drop to drain water, and there is a certain amount of water leakage in the traps, which leads to increased back pressure and makes recycling difficult.

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