300MW级供热机组脱硫及除尘系统综合提效改造研究分析

发布时间：2019-01-28 12:16

【摘要】：二氧化硫及各类氮氧化物是造成酸雨、臭氧空洞、温室效应等环境问题的主要源头,这些环境问题正在不断威胁我们的生活环境,带来许多危害。众所周知,煤的燃烧能够产生大量的硫化物,电厂作为燃煤大户,对燃煤排放物进行严格处理就显得尤为重要了。三河电厂现有火力发电锅炉SO2排放浓度限值为200mg/Nm3另2013年4月份关于京津冀地区SO2排放浓度限值为50mg/Nm3。由于目前煤炭市场供应状况,入厂煤硫份变化幅度较大,电厂锅炉燃煤无法控制在稳定的设计硫份范围内,现有脱硫装置很难满足新的环保标准要求,因此,必须对目前的脱硫除尘系统加以升级改造,以满足排放限值要求。经系统提效后,三河电厂脱硫系统提效改造目标为脱硫系统入口烟气现有SO2浓度为1857mg/Nm3时,满足脱硫出口SO2排放量低于35mg/Nm3,脱硫效率98.3%,脱硫入口设计烟尘含量为55 mg/Nm3,改造后烟囱入口设计烟尘含量为30mg/Nm3,除尘效率为72.7%。本文所研究的内容是对三河电厂目前运行状况进行分析,包括电厂内机组运行情况、煤质情况、脱硫系统所用工艺、及电厂附近环境,并提出相应的提效改造方案,方案主要包括:增加低温换热器技术方案、增加径流式电除尘器技术方案、脱硫系统增容改造技术方案、将#1、#2机组脱硫吸收塔出口净烟气,引至#3、#4烟塔方案、增加湿式电除尘方案、取消GGH(气气换热器)方案、增加MGGH(烟气换热装置)方案。通过对以上所提出的七种方案的优劣对比,我们提出了五种整体优化方案,最终选择最适合方案。此外,针对改造过程中涉及的设备部分也进行了详细的监理研究和分析,从监理原则、执行流程、质量控制、进度控制等角度进行了详细阐述;并针对改造中的主要设备的安装过程进行了重点监理分析,为工程实践提供参考建议。
[Abstract]:Sulfur dioxide and various nitrogen oxides are the main sources of environmental problems, such as acid rain, ozone hole, Greenhouse Effect and so on. These environmental problems are threatening our living environment and bring a lot of harm. It is well known that coal combustion can produce a large amount of sulfides, so it is very important for power plants to treat coal emissions strictly. The SO2 emission concentration limit for existing thermal power boilers in Sanhe Power Plant is 200mg/Nm3 and 50 mg / N m 3 for Beijing-Tianjin-Hebei region in April 2013. Because of the current coal market supply situation and the large change of the sulfur content in the incoming coal, the coal burning of the power plant boiler cannot be controlled within a stable design sulfur content range, so it is very difficult for the existing desulphurization units to meet the requirements of the new environmental protection standards. The current desulphurization and dust removal system must be upgraded to meet the emission limit requirements. After improving the efficiency of the system, the purpose of the retrofit of the desulfurization system in Sanhe Power Plant is that when the existing SO2 concentration of the flue gas in the flue gas of the system is 1857mg/Nm3, the discharge of SO2 from the desulfurization outlet is less than 35 mg / Nm3, and the desulfurization efficiency is 98.3%. The design smoke content of desulfurization inlet is 55 mg/Nm3, and the design smoke content of chimney entrance is 30 mg / Nm ~ (3), and the dust removal efficiency is 72.7%. The content of this paper is to analyze the current operation situation of Sanhe Power Plant, including unit operation, coal quality, desulphurization technology, and the surrounding environment of the power plant. The scheme mainly includes: adding the technical scheme of low temperature heat exchanger, adding the technical scheme of runoff type electrostatic precipitator, increasing the capacity of desulphurization system and revamping the technical scheme, leading the # 1 / #2 unit to the # 3 / #4 flue gas tower by exporting the net flue gas from the desulphurization and absorption tower. The wet electric dust removal scheme was added, the GGH scheme was cancelled, and the MGGH (flue gas heat exchanger) scheme was added. By comparing the advantages and disadvantages of the above seven schemes, we put forward five overall optimization schemes, and finally choose the most suitable scheme. In addition, the equipment involved in the process of transformation is also carried out detailed supervision research and analysis, from the supervision principles, execution process, quality control, progress control and other aspects of detailed elaboration; The key supervision analysis is carried out for the installation process of the main equipment in the revamp, which provides reference suggestions for the engineering practice.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X773

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