CO2 split reboiler structure

Abstract

The invention provides a CO2 split reboiler structure which comprises a rectifying tower and a reboiler, a liquid outlet in the bottom of the rectifying tower is connected with a liquid inlet in the bottom of a reboiler shell pass through a pipeline, and a gas phase inlet in the middle of the rectifying tower is connected with a gas phase outlet of the reboiler shell pass through a pipeline. A shell pass gas phase outlet of the reboiler is connected with a middle gas phase inlet of the rectifying tower. According to the split reboiler structure, CO2 liquid at the bottom of the rectifying tower obtains a new heat source, and non-condensable gas is vaporized and separated again; the structural form and the heat exchange effect of the reboiler can be designed at will according to actual needs, the reboiling efficiency can be improved, and higher treatment capacity can be obtained. The liquid level of CO2 in the shell pass of the reboiler can be monitored by the liquid level meter and accurately controlled by the liquid level regulating valve, and the temperature can be monitored by the thermometer and adjusted by the temperature regulating valve so that the rectification and purification effect is improved, and a carbon dioxide product with higher precision is obtained.

Description

technical field [0001] The invention relates to the technical field of chemical equipment, in particular to a carbon dioxide rectification and purification reboiler structure. Background technique [0002] Distillation and purification is the production of high-purity CO 2 The key process of the product, using the liquid CO to be rectified 2 Each component has different volatilities at the same pressure, and the physical characteristics of different condensation temperatures make the light noncondensables in the liquid phase volatilize and transfer to the gas phase, while the heavy components in the gas phase have high condensation temperature substances. into the liquid phase to achieve the purpose of separation of components. [0003] However, during the volatilization of noncondensables, it is necessary to provide a heat source to the rectification tower to make the liquid CO 2 The temperature rises. The current common practice is to heighten the distillation column a...

AI Technical Summary

Problems solved by technology

This type of heat exchanger has a low heat exchange effect. When the required heat exchange is large, the volume of the heat exchange section is too large for the rectification tower to bear. The design of the heat exchange section is too small and the heat source is not enough, which affects the purity of the rectification.

In addition, there is less liquid in the heat exchange section, the liquid level and temperature cannot be controlled, and the purity of the liquid CO2 from rectification cannot meet the high precision requirements

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