Limestone / lime gypsum wet FGD is a common construction technology. In process control of sulfur dioxide emissions in addition to the use of coal, coal briquette, circulating fluidized bed combustion technology measures, flue gas desulfurization technology is the most widely used of the technology, technology is more mature, reliable and stable operation of the device is very. Discussion on Anticorrosion of chimney lining
When the concentration of sulfuric acid in the inner wall of the chimney is concentrated in the middle state (the concentration of sulfuric acid is 15%, the maximum concentration can reach up to 40%):
The corrosion rate of C25 concrete is 8mm/10 days;
The corrosion rate of C30 concrete is 2.4mm/10 days;
The corrosion rate of C50 concrete is 2.4mm/10 days.
The necessary condition for safe operation of power plant chimney is that the reinforced concrete outer cylinder is not corroded by the flue gas. In order to achieve the purpose of effective anti-corrosion, it is necessary to ensure that the anti-corrosion materials in various operating conditions and temperature can effectively resist the corrosion of flue gas. Due to the change of flue gas composition, pressure and temperature (humidity) after desulfurization, it is necessary to choose a suitable anti-corrosion lining system to prevent corrosion of the steel tube chimney.
According to the analysis of operation condition of the chimney, requirements of lining material with anti acid corrosion resistance and resistance to temperature changes, temperature changes in the environment and frequent crack has a long life. The following factors should be taken into account in selecting the proper inner lining of chimney steel:
(1) technical feasibility. Meet the requirements of complex chemical environment.
(2) economic rationality. Low cost of construction, less one-time investment.
(3) easy construction, short cycle.
(4) suitable for the old chimney anti-corrosion transformation, light weight.
(5) long service life. The reliable running period of anticorrosion lining is long service life.
Three stages of chimney corrosion:
1, organization construction
2, start management
3, construction management. Discussion on Anticorrosion of chimney lining