System and method for comprehensively utilizing stone coal in whole process

Abstract

The invention relates to the technical field of stone coal utilization, in particular to a stone coal whole-process comprehensive utilization system and method.The stone coal raw coal is firstly subjected to vanadium metal extraction, stone coal tailings obtained after vanadium extraction and power plant raw coal are mixed and then enter a coal pulverizing system and a coal mill, and qualified coal powder is ground through the coal mill; and the gas enters a large-capacity high-parameter pulverized coal boiler for combustion and heat release, and finally heat energy is used for power generation. Ash can be used for comprehensive utilization of coal ash, and pollutants generated by combustion of stone coal tailings are also discharged cleanly. The method has the advantages that the stone coal vanadium extraction efficiency is high; (2) the heat efficiency of stone coal utilization is high; (3) comprehensive utilization of the stone coal tailings is realized; (4) pollutants generated by combustion of the stone coal tailings can be discharged cleanly; (5) the equipment abrasion caused by directly using the stone coal in the power station boiler is reduced; and (6) the whole-process comprehensive utilization of the stone coal is really realized.

Description

technical field [0001] The invention relates to the technical field of stone coal utilization, in particular to a system and method for comprehensive utilization of stone coal in the whole process. Background technique [0002] The vanadium extraction technology of stone coal vanadium ore mainly includes roasting method and acid leaching method. At present, the calcification roasting vanadium extraction process is mainly popularized and applied. Both of the vanadium extraction processes will produce a large amount of waste residue. At present, the waste residue from vanadium extraction is mainly used as raw materials for some building materials, such as cement admixture, brick making, etc., and can obtain good economic, social and environmental benefits. This kind of stone coal utilization method is mainly to extract the vanadium material in the stone coal, but the calorific value of the stone coal is not utilized, which is wasted. [0003] The existing comprehensive utiliz...

AI Technical Summary

Problems solved by technology

This kind of stone coal utilization method is mainly to extract the vanadium in the stone coal, but the calorific value of the stone coal is not utilized, and it is wasted

[0003] The existing comprehensive utilization projects of stone coal and vanadium ore are generally "use the calorific value of stone coal (vanadium ore) to generate electricity first - then extract vanadium with ash slag", which is usually applied to CFB boilers. The disadvantages of this method mainly include four Aspects: 1. Firstly, the stone coal needs to be transported to the circulating fluidized bed (CFB boiler) power plant, and the calorific value of the stone coal is utilized through the combustion of the circulating fluidized bed boiler, and the ash formed after combustion is transported back to the vanadium extraction plant for vanadium extraction , which increases the round-trip transportation cost; 2, stone coal (vanadium ore) usually has high hardness, relatively high impurity components, and large ash content, which causes wear and tear of power generation equipment; 3, the recovery rate of vanadium extraction by using ash slag is generally low; 4. Due to the relatively low boiler efficiency of the circulating fluidized bed boiler itself, the utilization efficiency of the calorific value of the stone coal is also low

[0004] To sum up, the above-mentioned existing models have not really realized the comprehensive utilization of stone coal, and have not "dried up" the real value of stone coal

Images