According to the development status of national environmental protection, the desulfurization systems of many original chimneys in China cannot meet the new environmental protection requirements and need to be rebuilt to meet the latest flue gas emission standards. At present, the design, construction, and operation experience of flue gas desulfurization units have been gradually improved. The key equipment for flue gas emissions of desulfurization units, the anti-corrosion of chimneys, has gradually attracted everyone's attention. After the chimneys of many power plants have been transformed by desulfurization, the original chimneys can no longer meet the anti-corrosion requirements under the low temperature and strong corrosive wet flue gas.
According to the current common chimney structure types and anti-corrosion characteristics of thermal power plants at home and abroad, the anti-corrosion treatment measures for steel chimneys after wet desulfurization mainly include: sticking foam glass bricks, spraying acid-resistant and heat-resistant integral castables, brushing high-temperature-resistant glass flakes, Coated with high-performance heat-resistant and acid-resistant coatings, titanium-steel composite plates.
Three alternatives are adopted: Bingold foam glass bricks, high-temperature resistant glass flakes or anti-corrosion coatings, and titanium clad steel plates. The technical and economic comparisons of steel sleeve chimneys with different anti-corrosion methods are compared with the relevant technologies of each scheme.
To choose a suitable lining for the chimney steel inner cylinder, the following factors must be considered:
(1) Technical feasibility to meet the anti-corrosion requirements in complex chemical environments;
(2) Economical and reasonable, low construction cost, low one-time investment cost;
(3) The construction is easy to carry out, the speed is fast, and the cycle is short;
The operation and maintenance cost is low, and the maintenance is convenient. It should be noted that the selection of materials should not only consider the initial cost but also consider the reliable operation cycle (ie the overhaul cycle) and total service life of the device, so as to make an economically reasonable decision.
According to the technical and economic comparison and selection of chimney anti-corrosion transformation, and considering the operation status of the desulfurization facilities and chimneys of the original power plant of this project, the following conclusions are drawn:
(1) The original flue gas after wet desulfurization has a low temperature, high humidity, high water content, and strong corrosiveness. The original chimney anti-corrosion facilities can no longer meet the operation requirements of the power plant, and the original chimney anti-corrosion needs to be reconstructed.
(2) In view of the current situation, the three solutions of Bingold foam glass bricks, high-temperature resistant glass flakes or anti-corrosion coatings, and titanium-steel composite plates can all meet the operation and anti-corrosion requirements after the flue gas desulfurization transformation. The steel sleeve of the titanium-steel composite plates The cartridge form has great technical advantages and requires little maintenance.
(3) In view of economic comparison, the cost of transformation of titanium-steel composite plates and Bingold foam glass bricks is relatively high, 20% and 30% higher respectively.
(4) Combining the technical and economic comparison of the three schemes, and considering the long-term operation, the technical scheme of using the titanium-steel composite plate inner cylinder meets the expectations.
In summary, from the comprehensive analysis of the safety, corrosion resistance, economy, construction period, and long-term operation cost of the structure, it is the best method to use titanium steel composite plate for the inner cylinder.
Compared with the other two methods, titanium-steel clad plate has the advantages of strong corrosion resistance and instant repair of local damage; firm combination with steel plate, stable performance, and good airtightness; basically no maintenance is required, and the anti-corrosion life can reach 50 years, and there are many successful cases at home and abroad, so the application prospect of the modified method is very broad. If your company is looking for qualified titanium steel composite plate manufacturers, welcome to consult and cooperate!
