Waste heat recovery system for vaporization latent heat of tower top gas of rectifying tower

Abstract

According to the waste heat recovery system for the vaporization latent heat of the tower top gas of the rectifying tower, the compression system is additionally arranged, the tower top gas produced by the rectifying tower is subjected to temperature and pressure increasing treatment, and the tower top gas which is originally low in temperature and pressure and difficult to directly utilize is converted into gas with high temperature and pressure; the latent heat of vaporization in the tower top gas is effectively recovered. And the treated tower top gas enters the heat exchange unit and exchanges heat with a cold side material flow from the bottom of the rectifying tower, so that efficient cyclic utilization of energy is realized, and dependence on an external high-quality heat source is remarkably reduced. The system further comprises a cold utility system, a gas-liquid separation system, a backflow and product pump and a cold side logistics conveying system, and it is ensured that the whole waste heat recovery process is smoothly carried out. According to the innovative technical scheme, the energy utilization efficiency is improved, the energy consumption and the operation cost are reduced, an effective way is provided for energy conservation and consumption reduction of the rectifying tower, and remarkable economic benefits and environmental benefits are achieved.