Double-side strengthened heat transfer smoke tube of vertical gas-fired hot water boiler

Abstract

The invention provides a double-side strengthened heat transfer smoke tube of a vertical gas-fired hot water boiler. The double-site strengthened heat transfer smoke tube is characterized in that the smoke tube is sleeved with a longitudinal corrugated fin and a blind tube with a spiral sheet is arranged in the smoke tube. The longitudinal corrugated fin is formed by bending and welding a thin steel plate which is repeatedly folded according to the width half of the space of the smoke tube. The outer wall face of the smoke tube is tightly sleeved with the whole corrugated fin by high-frequency welding, the heat-transfer area of the outer side of the smoke tube can be remarkably increased, and therefore natural-convection heat transfer of water outside the smoke tube is reinforced. After the blind tube is wound by the spiral sheet, the blind tube and the spiral sheet are integrally inserted into the smoke tube and fixed, the smoke flow area is reduced through the blind tube, the smoke flow speed is increased, spiral flow of smoke is generated by the spiral sheet, the smoke flow path is lengthened, and convection heat transfer of the smoke and the wall face of the smoke tube is reinforced. The double-side strengthened heat transfer smoke tube is simple in structure, convenient to manufacture and capable of reinforcing convection heat transfer between the smoke and water, decreasing the smoke discharging temperature of the boiler and effectively improving the heat efficiency of the boiler.

Description

technical field [0001] The invention relates to a smoke pipe of a vertical gas-fired hot water boiler, in particular to a double-sided enhanced heat transfer smoke pipe. Background technique [0002] The vertical gas-fired hot water boiler is an important thermal energy equipment for producing hot water with natural gas as fuel. The flue gas is inside the pipe, which belongs to the shell boiler. It has a simple and compact structure, a small footprint, and low environmental pollution, so it is widely used. . The smoke tube is the core component of the boiler heat exchange system. At present, smooth straight tubes are generally used, and the height of the furnace body limits the length of the smoke tube, which makes the flow of the flue gas shorter, the heat exchange area of ​​the smoke tube is insufficient, and the distance between the flue gas and the wall of the tube The convective heat transfer coefficient is generally small, so the smooth straight tube cannot fully abso...

AI Technical Summary

Problems solved by technology

The smoke tube is the core component of the boiler heat exchange system. At present, smooth straight tubes are generally used, and the height of the furnace body limits the length of the smoke tube, which makes the flow of the flue gas shorter, the heat exchange area of ​​the smoke tube is insufficient, and the distance between the flue gas and the wall of the tube The convective heat transfer coefficient is generally small, so the smooth straight tube cannot fully absorb the heat released by fuel combustion, resulting in a high exhaust gas temperature of the boiler. According to statistics, the exhaust gas temperature is generally above 230°C, which not only wastes a lot of heat energy, but also causes environmental pollution. Heat pollution, resulting in low thermal efficiency of vertical gas hot water boilers

At the same time, the outside of the smoke tube of the vertical gas-fired hot water boiler is static water. After being heated by the wall of the smoke tube, the water will undergo natural convection, so its heat transfer coefficient is relatively small.

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