Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for removing chlorine from desulfurization wastewater drying ash in coal-fired power plants

A technology for desulfurization wastewater and coal-fired power plants, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve the problems of large output of dried ash, waste of resources, low chlorine removal rate, etc. Good chlorine effect, cost saving, and easy removal

Active Publication Date: 2021-08-17
ZHEJIANG ZHENENG TECHN RES INST
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the current problem of large output of dried ash from desulfurization wastewater in coal-fired power plants, difficult to handle, and waste of resources caused by a large amount of accumulation, the dried ash can be well utilized as a resource after dechlorination
However, the use of a single dechlorination method will cause the problem of low dechlorination rate

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for removing chlorine from desulfurization wastewater drying ash in coal-fired power plants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 3g of ash slag that has been sieved by a dry ball mill, accurately weigh it to 0.1g, put it in a 100ml beaker, and pickle it with 0.8mol / L acetic acid solution according to the solid-to-liquid ratio of 1:10. Stir in a magnetic stirrer at room temperature for 5 minutes, then pour the mixture into a centrifuge tube, and centrifuge at 1000 r / min for 15 minutes. Pour off the lotion, continue to add acid solution into the centrifuge tube, place it in an ultrasonic cleaner for 10 minutes of ultrasonic oscillation, then pour it into a beaker for magnetic stirring for 10 minutes, and then repeat the above steps for centrifugal ultrasonication.

[0028] Remove the lotion, add deionized water to the centrifuge tube and perform ultrasonic oscillation for 10 minutes, then use a Buchner funnel and qualitative filter paper to perform suction filtration, and then wash and filter twice to obtain the filter residue. The filter residue was dried in an oven at 105° C. to a constant ...

Embodiment 2

[0031] Weigh 3g of the ash slag that has been sieved by a dry ball mill, accurately weigh it to 0.1g, put it in a 100ml beaker, and pickle it with 0.6mol / L acetic acid solution according to the solid-to-liquid ratio of 1:15. Stir in a magnetic stirrer at room temperature for 5 min, then pour the mixture into a centrifuge tube, and centrifuge at 500 r / min for 20 min. Pour off the lotion, continue to add acid solution into the centrifuge tube, place it in an ultrasonic cleaner for 10 minutes of ultrasonic oscillation, then pour it into a beaker for magnetic stirring for 10 minutes, and then repeat the above steps for centrifugal ultrasonication.

[0032] Remove the lotion, add deionized water to the centrifuge tube and perform ultrasonic oscillation for 10 minutes, then use a Buchner funnel and qualitative filter paper to perform suction filtration, and then wash and filter once more to obtain the filter residue. The filter residue was dried in an oven at 105° C. to a constant w...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for removing chlorine from desulphurized waste water in a coal-fired power plant, which comprises: weighing a certain amount of ash, drying the ash, ball milling and sieving the ash. Place in a beaker, add acid solution for pickling. The beneficial effects of the present invention are: the present invention adopts pickling and calcination as the dechlorination method, removes the water-soluble chloride by pickling dechlorination and ultrasonic vibration, and then suction-filters the ash residue after pickling, centrifugation and ultrasonication, and suction-filters Calcining the final dried ash can easily remove insoluble chlorides and a small amount of organic matter, and the dechlorination effect can reach 98.1%. The dried ash can be pickled with waste acid. Due to the high concentration of waste acid, the chlorine removal effect is better and the cost is saved. It can also be extended to use waste acid produced in industry to treat dry ash, so as to achieve the effect of treating waste with waste.

Description

technical field [0001] The invention belongs to the field of desulfurization in coal-fired power plants, and in particular relates to a method for removing chlorine from the dried ash of desulfurization wastewater in coal-fired power plants. Background technique [0002] Coal-fired power generation is currently the most important way of thermal power generation in my country, and the desulfurization of coal-fired flue gas has become the key to air governance. Among them, limestone-gypsum wet flue gas desulfurization technology accounts for the highest proportion in coal-fired flue gas desulfurization treatment, exceeding 75%. The limestone-gypsum wet process converts gaseous sulfur into other forms of sulfur, but the process produces desulfurization wastewater that is harmful to the environment. Desulfurization wastewater has complex components, high salt content and is extremely difficult to treat. Direct discharge will cause great harm to water quality and soil. In respo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B09B5/00B09B3/00
CPCB09B5/00B09B3/00B09B3/40
Inventor 陈彪童小忠雷石宜陈雨帆冯向东盛嘉伟孙敏孙青张俭
Owner ZHEJIANG ZHENENG TECHN RES INST