300MW級(jí)供熱機(jī)組脫硫及除塵系統(tǒng)綜合提效改造研究分析
[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.
【學(xué)位授予單位】:華北電力大學(xué)(北京)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:X773
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