Title: Analysis on explosive characteristics and explosion precautions of Shenhua coal in pulverized system
ABSTRACT
Pulverized coal preparation system plays a key role in the generation of electrical energy in heat power plant, which is known for its grave potential risks and the high requirements on the operation process. Since it is explosive and flammable, the pulverized coal preparation system has long been a bottle neck of improvement of the security condition in power enterprises. More importantly, this problem not only brings tremendous loss to the power plant, but also makes a deadly threat to worker’s lives and menace the unit safety operation. Many power plants and research institutions have been studying this problem over time aiming at a perfect solution. However, all these effects are ended in vain because of the frustrating factors such as the varieties of device characteristics, the different levels of worker’s skills and the disparateness of manager’s attitude and management style.
In this essay, we study on the ball mill pulverizing system installed in the two 110MW units of shenhua guohua power plant, in which Shenhua coal has been using for a long time. Shenhua coal contains high volatiles but has very low ignition point, and this character makes it combustive and explosive. Evaluating the actual operating situation of using Shenhua coal in ball mill pulverizing system, we have computed the explosive index of Shenhua coal. Based on this, we furthered research on the explosive characteristics of Shenhua coal, and provided a series of effective measures to prevent and cope with potential risks and explosions in ball mill pulverizing system.
This essay is based on the actual operation of Shenhua coal in Shenmu power plant, and we also checked up many research papers about the operational performance standards of ball mill pulverizing system. By studying specific cases, we analyzed the relationship between coal dust explosion and the three key factors: combustible concentration, oxygen contents, and ignition. These case study results will not only provide efficient ways to eliminate a potential danger in Shenmu power plant, but also meaningful to the prevention of explosions in other pulverizing systems.
TYPE OF THESIS: research report
KEY WORDS: Shenhua coal; pulverizing system; explosive characteristics; explosion precaution