Pollution is a headache for textile dyeing and finishing plants. Although we cannot eliminate pollution from the roots, we can start from a small place! The following are the ten steps for saving water, saving energy, reducing the use of chemicals, and low-cost methods that can greatly reduce the pollution of textile dyeing and finishing plants.
1. Check for leaks and perform protective maintenance:
A 2 mm steam leak will produce more than 10 tons of coal per year of energy loss. The method of shutting down the pipes when the pipes are not in use, the routine investigation and the leakage of repaired water, steam and compressed air almost do not require investment costs and can be immediately effective.
2. Reuse non-contact cooling water:
Because non-contact cooling water is of good quality and temperature, it can be reused in desizing, scouring, rinsing and other processes. The three best sources of recycled cooling water are: singeing machines, preshrinking machines, and compressor systems. The factory can install recovery water systems, pipes, valves, holding tanks, and control systems.
3. Reuse steam condensate:
In the dyeing process, textile mills need a large amount of saturated steam, and some of them are converted into condensed water, which has a very high temperature and purity. This water can be brought back to the boiler to become new water vapor. As for those manufacturers that purchase water vapor from suppliers, or those whose boilers are located far from the dyeing process, these condensates can be used as water for washing or desizing.
4. Wastewater re-use of pre-treatment procedures
The water discharged from the bleaching and mercerizing process can be collected and reused in other procedures without the need for direct discharge of waste water.
5. Recover hot gas from hot wash water
During the dyeing process, a large amount of hot water of high temperature is used for washing, and the heat energy of the washing water can be collected via a plate heat exchange system for preheating the water to be used as the next washing water. . The initial costs are high, but the recovery of investment is fast, probably within 2-4 months.
6. Pre-screen coal blocks
Enterprises should import spiral coal screening technology to screen the original media into the boiler. In this way, it is possible to increase the ratio of good and bad quality of the resolution media, to avoid the loss of small coal, and to increase the calorific value of the coal.
7. Maintain steam trap
Vapor traps can help maintain the efficient delivery of water vapor in the factory. These valves remove moisture from the steam line to prevent further condensation, thus avoiding loss of hot gas and reducing fuel consumption.
8. Insulate pipes, valves and flanges
Losses of hot gases in pipelines, valves, flanges, etc. may waste resources and reduce efficiency. It is a cheap and energy-saving method to insulate steam transportation equipment and avoid vapor losses.
9. Recover hot gas from the chimney
Boilers emit smoke when the temperature reaches 360°C. These smokes are sometimes discharged directly into the atmosphere without recovering thermal energy. In fact, these hot gases can be used to preheat boiler water or create new steam for the steam system.
10. Optimized compressed air system
In textile mills, instruments in many locations consume a large amount of compressed air. These instruments are vulnerable to leakage, especially in threaded connection points, rubber joints, valves, automatic regulators, gaskets, and old ones. Inflatable equipment and other places. In addition, the use pressure of compressed air is usually set according to the maximum pressure; it is feasible to reduce the pressure without any negative influence on the production.
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