Pin tube exhaust heat boiler of KNPT seriesdesigned for recovery of flue gas waste heat of the gas-drivengenerator was the special energy-efficient product. With the pintube intensified heat-transferring element, the heating surfacingof the water pipe can rise sharply, and the flue gas can produce astrong eddy flow when passing through the pin tube surface,increasing the heat transport efficiency, reducing the accumulationof the cigarette ash. The exhaust heat boiler has the merit ofsimple structure, high heat efficiency, long average during oflife, safe and easy to maintain.