Composition and technical indicators of tubular heating furnace equipment
Composition and technical indicators of tubular heating furnace equipment. Everyone should be familiar with heating furnace equipment. After all, many common electrical appliances in our lives have this function. Large-scale heating equipment is relatively rare, and generally only available in factories. Kehua will introduce to you the composition of the heating furnace equipment. 1. The tubular heating furnace is usually composed of the following parts: Radiation chamber: the part that conducts radiation heat transfer through flame or high temperature flue gas. This part is directly washed by the flame, and the temperature is very high (600-1600 ° C), which is the main place for heat exchange (about 70-80% of the heat load). Convective chamber: The heat exchange part mainly based on convection heat transfer is carried out by the flue gas from the radiation chamber. Burner: It is a heat-generating device that atomizes fuel and mixes air to burn it. Burners can be divided into fuel oil burners, fuel gas burners and oil-gas combined burners. Heating furnace equipment Ventilation system: The combustion air is introduced into the burner and the flue gas is led out of the furnace, which can be divided into natural ventilation and forced ventilation. Tubular heating furnace, including heating furnace body and waste heat recovery system, waste heat recovery system including air preheater, wherein air preheater is composed of two stages of non-condensing air preheater and condensing air preheater, waste heat recovery system There is also a condensate collection pool, an induced draft fan and a blower in the middle. The condensate collection pool is directly below the condensing air preheater, the condensate collection pool is connected with the induced draft fan, and the blower is connected with the condensing air preheater. Using the heating furnace provided by the present invention, the exhaust gas temperature of the heating furnace can be reduced to about 100° C., the partial condensation of the acid-containing water vapor in the flue gas can be realized, and while the low-temperature sensible heat of the flue gas is recovered, part of the flue gas can be recovered. The latent heat of vaporization of acid water vapor further improves the thermal efficiency of the heating furnace and saves energy. 2. Technical indicators Heat load The total heat transferred to the medium in the tube per unit time of each heating furnace, the unit is W or kJ/h. The greater the heat load of the furnace, the greater its production capacity. Furnace Heat Intensity The total calorific value of fuel combustion divided by the furnace volume is called the furnace heat intensity (also known as volume heat intensity), which represents the heat released by the combustion of the fuel per unit volume of the furnace in a unit time, the unit is kJ/m3 h or W/m3. The greater the furnace heat intensity, the more compact the furnace is required to accomplish the same thermal task. Heat intensity of furnace tube surface The heat transferred by unit surface area of u200bu200bfurnace tube in unit time is called surface heat intensity of furnace tube, and the unit is kJ/m2·h or W/m2. The greater the heat intensity of the furnace tube surface, the smaller the heat transfer area required to complete the same thermal task, the less furnace tubes are used, the furnace volume can be reduced, and the investment can be reduced. It should be noted that the thermal strength of the furnace tube surface generally refers to the average value. Furnace equipment Furnace temperature (also known as fire wall temperature) Furnace temperature refers to the temperature of the flue gas when it leaves the radiation chamber and enters the convection chamber. Flow velocity and pressure drop in the tube The lower the flow velocity of the liquid in the tube, the thicker the boundary layer, the smaller the heat transfer coefficient, the higher the tube wall temperature, and the longer the residence time of the medium in the furnace. As a result, the medium is easily coked and the furnace tube is easily damaged. However, if the flow rate is too high, the pressure drop in the pipe increases, which increases the power consumption of the pipeline system. After the above introduction, you will understand what is the working principle of heating furnace equipment. If you want to know more about heating furnace equipment, you can go to relevant schools to learn. That's it for today's introduction to Kehua.