1, overview

In the past twenty years, China's power industry has achieved rapid development, after the United States, ranking second in the world. According to the annual report of the national electric power company, as of 2000 ~, the national thermal power installed capacity reached 3.16 kW, the total generating capacity of the country reached 1350000000000 K W - H, the fire power installed capacity of the total installed capacity of 74.9%, thermal power accounted for the proportion of total generating capacity of 0.8%, according to the national electric power company the plan, to 2010, the installed capacity can reach 450G W; in 2015 the installed capacity can reach 550G W. China's coal-fired power generation as the main pattern of change in a very long period of time is not very large, China's coal a year of production and consumption of up to 12 tons, the annual emissions of S02 about 20000000 tons, ranking the first in the world. Expected to 2010, with the increase of installed capacity, China's coal consumption will reach 18 tons, if not to take control measures, annual emissions of SCh will be up to ~ 33000000 tons, will cause great harm to environment and human, SCh pollution control problems to be solved.

At present a lot of desulfurization technology worldwide, desulfurization technology can be divided into pre combustion, combustion and after combustion three. Mainly refers to the desulfurization before combustion, coal gasification, coal liquefaction and coal water slurry combustion desulfurization technology: refers to the low pollution, briquette and fluidized bed combustion technology; flue gas desulfurization desulfurization after combustion is called. Flue gas desulfurization technology includes limestone gypsum desulphurization, rotating spray drying desulfurization, desulfurization, electron beam furnace calcium injection by tail wet flue gas desulphurization and seawater desulfurization desulfurization technology etc.. It is the most widely used wet desulfurization technology, the technology is mature, stable and reliable operation, the highest removal rate of sulfur dioxide, can run stably in more than 95%, suitable for many kinds of coal, especially suitable for large units and units desulfurization desulfurization efficiency high.

2, wet desulfurization process system

Wet limestone gypsum FGD. Using limestone as a desulfurization agent, flue gas desulfurization system comprises a heat exchanger system, desulfurization, desulfurization absorption tower slurry preparation system, gypsum dewatering system and wastewater treatment system.

The problem analysis and research of.Doc wet limestone gypsum desulphurization in operation

The problem analysis and research of.Doc wet limestone gypsum desulphurization in operation