Cleaning method and system for dyeing kettle of supercritical CO2 dyeing system

Abstract

The invention provides a cleaning method and system for a dyeing kettle of a supercritical CO2 dyeing system. The cleaning method comprises the following steps: mounting turbulent flow impellers in adyeing kettle; starting a pressure pump, introducing a proper amount of CO2 to form supercritical CO2 so as to drive turbulent flow impellers to rotate; starting a circulating pump, so as to drive a supercritical CO2 fluid to circularly flow; slowly starting a decompression separation valve, simultaneously starting the pressure pump, regulating the decompression separation flow to keep the pressure of the whole dyeing system to be constant, so as to realize the dynamic balance between introduced CO2 and separated CO2; and separating and recycling CO2. The turbulent flow impellers are mounted in the dyeing kettle and are used for stirring CO2 airflow, so that the flow speed and flow direction of the CO2 fluid are changed, each corner in the dyeing kettle can be flushed by the CO2 fluid in an eddy manner, the cleaning efficiency and thoroughness are improved.

Description

technical field [0001] The invention belongs to the technical field of dyeing, and in particular relates to a cleaning method and a cleaning system for a dyeing kettle after dyeing. Background technique [0002] Supercritical CO 2 Anhydrous dyeing is a new type of green dyeing method, which has excellent characteristics such as high efficiency, no pollution, and short dyeing time. The technology uses supercritical CO 2 As a staining medium, in CO 2 When the heated temperature exceeds 31°C and the pressure exceeds 7.3MPa, it becomes a non-gas and non-liquid state - supercritical state. At present, many countries are working hard to develop this new type of green dyeing and finishing equipment with energy saving and emission reduction and wide application, trying to push it to industrialization and practicality. [0003] In the large-scale production process of supercritical anhydrous dyeing, after dyeing a color, there is usually residual dye inside the dyeing kettle. Whe...

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Problems solved by technology

The cleaning method disclosed in this patent only dissolves the residual dye in the autoclave by feeding supercritical fluid into the autoclave. The flow velocity and flow direction of the supercritical fluid in the autoclave cannot be controlled, and dead angles are easily formed at the edges and corners around the autoclave. , it is difficult to clean. If you want to clean the autoclave thoroughly, you need to prolong the feeding time of the supercritical fluid and increase the feeding volume, and the dyeing kettle occupies more than half of the volume of the entire dyeing system. Cleaning method and cleaning device, the cleaning efficiency will be very slow, and the effect will be poor, and the cleaning cost will be high

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