Boiler economizer can reduce flue gas temperature, flue gas heat recovery, improve boiler thermal efficiency and save fuel. After convection superheater or economizer tubes installed, you can effectively reduce the flue gas temperature, recovered a lot of heat, save a lot of fuel, due to the early coal-fired boiler is usually, so called economizer. After installing the boiler economizer into the drum of water temperature is greatly improved. For boiling economizer, the saturation temperature of the drum into the water temperature is the drum under pressure, for non-boiling economizer, it enters the water temperature has not yet reached the drum but also close to the saturation temperature. Therefore, water heated by the economizer, because the water temperature is equal to or close to the saturation temperature of the drum under pressure, can be reduced due to thermal stress caused by temperature differences, improve the working conditions of the drum. According to reports, the boiler flue gas heat loss is one of the largest heat loss, typically about 5% to 12%, accounting for 60% to 70% of the boiler heat loss. The main factors affecting the exhaust heat loss is the exhaust gas temperature, under normal circumstances, the exhaust gas temperature is increased by 10, an increase of 0.6% to 1% of heat losses, 1.2% more than the corresponding coal consumption to 2.4%. The new H-fin tube economizer heat as the main body, its edge is about 2 times the light pipe, boiler accessories extends the heating surface, while the fin tube using flash resistance welding process, with good thermal conductivity. Traditional economizer flue gas temperature is generally only guarantee is reduced by 30 to 35, this new economizer flue gas temperature can be as low as 120, the temperature drop of up to 100 or more. After taking one 10 tons boiler, for example, the installation of finned tubes economizer, the exhaust gas temperature from 210 down to 150 or less, the boiler efficiency is increased by 5% economizer 1.44 tons per day, the annual cost savings of nearly $ 300,000. Features: 1, extended surface heat economizer ash can reduce the wear surface heating surface, while heating surface enables compact structure, reduce air flow resistance and flow resistance of the working fluid, metal consumption is reduced. 2, using extended heating surface, so that under the existing installation space conditions to ensure improved heat transfer. 3, lower flue gas velocity, reduce wear and avoid fouling and low temperature corrosion, improve the stability of the boiler economizer heating surface 4, extended heating surface, reducing the heat transfer coefficient product advantages: high frequency resistance welding spiral finned tube Compared with other types of expansion surface of the tube (such as fin tube, diaphragm tube, patch tubes, etc.) has the following distinguishing characteristics: 1) fin base line pressure welded into one solid welding (welding with rates more than 95%), the thermal contact resistance is extremely small, the strength of the substrate tube has been strengthened, the possibility of causing problems due to thermal expansion is also small. 2) the extension pipe unit length greater surface area (typically more than 5 times the light pipe), when the same heat transfer is small, so that the number of tubes greatly reduced (reduced by about 40% to 50%), can save quality pipe and also reduces the number of components and the weld pressure number, thus reducing the chance of exploding and leaking. 3) Due to a substantial expansion of the finned tubes heated area, heat transfer enhancement, making the unit volume can greatly increase the heating surface layout, you can choose lower-than-light pipe flue gas velocity, so that the wear is reduced. Even with the same speed of light smoke tube wear lighter. 4) In the same space can be arranged more fin-tube heat transfer area, and therefore without the need to expand the rear of the boiler-type body conditions may further reduce the flue gas temperature, so that the boiler exhaust gas temperature is generally high current problems can be alleviated.