神华煤在中储式制粉系统应用中防止爆炸和治理措施的研究

范文编号:RN057  范文字数:13034,页数:29

范文题目：神华煤在中储式制粉系统运用中爆炸特性和防治措施的研究
摘    要
煤粉制备系统是火力发电厂电能生产中非常关键的设备系统，安全风险大，运行要求高。煤粉制备系统易燃易爆问题长期以来制约着电力企业的安全生产，直接威胁到机组的安全运行和人身安全健康，同时给电厂造成了严重损失。有关电厂和各家科研机构一直以来致力于其深入研究和加以解决。但是由于各电厂的设备特性以及技术水平的差异以及认识和管理水平的迥异，使得没有形成统一的治理方法措施。
本文以神华国华神木发电有限公司（以下简称神木电厂）2×110MW机组采用的中储式制粉系统为研究对象，以该电厂长期燃用神华煤的运行实践情况为研究依据，对神华煤挥发份较高，着火点较低，易燃导致制粉系统发生爆炸等特性，结合中储式制粉系统的特点，在对燃烧神华煤制粉系统进行了大量调研的基础上，通过单样神华煤爆炸指数的计算，对神华煤爆炸特性进一步分析，并据此深入的调查研究，全面分析，提出了中储式制粉系统防爆和隐患治理措施。
本文在神木电厂历年燃用神华煤的实践应用和查阅大量科技文献以及运行规范等资料基础上就中储式制粉系统进行了详实的介绍，结合事故案例对神华煤在中储式制粉系统运用中爆炸特性和防治措施进行分析研究，通过对可燃物的浓度、氧气的浓度、点火能三个条件的煤粉爆炸条件的逐步分析，制定出合理有效的措施，实践中对制粉系统防爆有着很大的作用，为神木公司消除制粉系统爆炸隐患提供了依据，同时也为其他燃用神华煤电厂的制粉系统，特别为中储式制粉系统应用中的防爆和防治措施提供了科学依据。

范文类型：研究报告

关 键 词：神华煤；中储式制粉系统；爆炸特性；防爆措施

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

目  录
摘    要 I
ABSTRACT III
目  录 V
1  绪 论 1
1.1选题意义及应用背景 1
1.2行业研究状况 1
1.3研究内容 1
1.4中储式治粉系统应用概况 2
2 神华煤的爆炸特性研究 5
2.1神华煤的爆炸特性 5
2.2 神木电厂中储式制粉系统爆炸典型案例分析 6
3  制粉系统爆炸原理 13
3.1 制粉系统爆炸三要素 13
3.1.1可燃物浓度 13
3.1.2 点燃能 13
氧气浓度 14
4  防止制粉系统爆炸的技术措施 15
4.1防止制粉系统爆炸的运行措施 15
4.1.1控制磨煤机出口允许最高温度 15
4.1.2 保证中间仓储式制粉系统足够的抽粉时间 15
4.1.3 定期降粉和控制粉仓温度是中间仓储式制粉系统粉仓自然爆炸的有效手段 16
4.1.4 规范吸潮管的操作是防止中间仓储式制粉系统粉仓内煤粉板结的有效手段 16
4.1.5混煤参烧也能有效降低煤粉的爆炸性指数 16
4.1.6适当提高制粉系统煤粉细度 16
4.1.7 设备定期切换运行能有效防止积煤自燃 17
4.1.8 加强煤场存煤管理 17
4.1.9 规范启停操作，避免制粉系统发生爆炸 17
4.1.10 合理确定最佳一次风速 17
4.2防止制粉系统爆炸在设备维护方面的措施 17
4.2.1确保制粉系统防爆门正确动作，保护系统和主设备不受破坏 17
4.2.2安装制粉系统启停爆炸装置，保证人身安全 18
4.2.3保证制粉系统附件电缆安全，防止事故扩大 18
4.2.4必须有效控制制粉系统漏粉、漏风 18
4.2.5通过系统改造减少或消除积粉 18
5  结论和展望 19
5.1结论 19
5.2展望 20
6  致    谢 21
7  参考文献 23

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