Title: Large-scale coal-fired boilers Ljungstrom air preheater leakage-related issues
ABSTRACT
Ljungstrom air preheater and medium-sized power plant is widely used on the rear of the boiler heat transfer equipment, a large quantity of air leakage during normal operation affecting the boiler efficiency has been one of the keys. The high leakage rate of such fatal shortcoming of air preheater, so Ljungstrom air preheater technology, to prevent or reduce the air leakage sealing technology that plays an important role. Paper derived a general air preheater leakage formula to analyze the factors that affect the air leakage is proposed dual-seal technology, the new structure, static seal, install the automatic control systems to reduce leakage of air leakage response. This paper analyzes the divine power plants in China, Shaanxi Country Huajin sector 2093t / h boiler rotary air pre-heater leakage, wear, plugging ash, smoke high temperature causes. A description of the transformation adopted a series of effective techniques. Solve the air leakage, wear, ash, and exhaust gas temperature higher blocking problem. Has achieved good safety and economic benefits. In this paper, the basis of information access to a large number of scientific and technical literature on the Ljungstrom air preheater dual-seal technology, the new structure, static seal, the installation of air leakage of the principle of automatic control system to do a brief introduction on the use of the advantages of dynamic and static sealing technology gap, technical characteristics of the analysis; according to China's status quo prediction application prospect of this technology and propose countermeasures.
