| Summary: | 碩士 === 國立高雄科技大學 === 機械工程系 === 107 === The heating furnace is the most important equipment in process heating, and it is also the device with the highest energy consumption. The operating performance of the hot furnace affects energy saving and carbon reduction. The heating furnace generally uses a flue gas, a furnace wall lining and a burner to the furnace tube in the radiation zone, and the heat is absorbed by the radiant heat to obtain a heat exchange effect, but still suffers from some abnormal heat loss. Reduce the intensity of radiant heat energy. The research will improve the radiant heat energy intensity of the refractory lining and the heat transfer efficiency of the furnace tube by improving the emissivity of the refractory lining and the surface cleaning of the furnace tube. When the residual oxygen content of the research equipment is fixed, the goal of energy saving and carbon reduction is achieved by reducing the temperature of the flue gas exhaust and reducing the loss of thermal efficiency of the heating furnace. Measuring the flue gas temperature and infrared thermal imaging instrument to measure the surface of the furnace tube and the surface temperature of the furnace wall, as a comparison of the temperature changes before and after the improvement of the furnace tube and the outer wall of the furnace, in order to analyze the effectiveness of the experiments at each stage. Then explore whether its energy saving effect is in line with expectations.
The main research equipment is carried out in conjunction with the planned shutdown, so it is divided into three stages. The first stage: the original refractory lining of the equipment is a ceramic fiber cotton blanket, which is changed to a ceramic fiber module. The experimental results show that after replacement of the refractory lining, the average temperature at the top of the outer wall of the furnace is reduced by about 33 ° C ~ 36 ° C, and the side wall is reduced by about 24 ° C ~ 35 ° C, which can reduce the heat loss caused by conduction, but the ceramic fiber material itself emits The rate limit, so the average exhaust gas temperature is only reduced by about 7 ° C, which is not ideal for enhancing radiant heat energy and reducing heat loss. The second stage: the furnace tube cleans the surface oxide layer by sand blasting, and enhances the effect of the tube absorbing radiant heat energy. The experimental results show that after the furnace tube is cleaned by sand blasting, the effect of reducing the average temperature of the flue gas discharge is most obvious, and the most about 51 The decrease of °C, and the surface temperature of the furnace tube is also reduced from 759 ° C ~ 774 ° C to 606 ° C ~ 660 ° C, the surface of the furnace tube is clean or not has a great impact on the absorption of radiant heat energy. The third stage: the refractory lining of the furnace wall is made of ceramic fiber material and sprayed with high emissivity paint. The results show that the initial stage of reducing the average discharge temperature of the flue gas is only about 2~8 °C, but according to the temperature distribution. In view of this, there is still a tendency to gradually decline. The temperature of the outer wall of the furnace is reduced from 78 °C to 81 °C to 74 °C to 78 °C, and the local maximum temperature is also lowered from 99 °C to 92 °C. It has the effect of improving the local high temperature, and slows down the refractory lining at high temperatures. Shrinkage still helps.
Furnace pipe blast cleaning is the best for reducing the average emission temperature of flue gas, but there is still construction time-consuming and dust pollution problems. High emissivity coatings are not immediately apparent in the early stage of operation, but the coatings are water-based ceramic coatings, which have little impact on the human body and the environment, and the construction is very simple. These advantages are very suitable for use in the factory shutdown, only The cost of implementation is higher. Therefore, the above-mentioned various improvement methods must be set up in a way that best meets the company's benefits.
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