基于水传热和红外热成像的煤矸识别方法

Coal gangue recognition method based on water heat transfer and infrared thermal imaging

基于可见光图像的煤矸识别方法准确率不高、识别速度慢;基于高能射线透射的煤矸识别方法具有很大辐射导致较少应用。红外热成像具有穿透性强、不受光线影响等优点,但煤和矸石的表面温度在室温下相对接近,导致煤和矸石在红外热图像中没有明显差异,难以获得较好的识别效果。针对上述问题,提出了一种基于水传热和红外热成像的煤矸识别方法。在不同水温(18,21,24,27,30℃)条件下进行煤和矸石红外热成像实验,通过煤和矸石红外热图像和温度变化之间的差异来区分煤和矸石。实验结果表明:不同水温下煤和矸石红外热图像不同,当水温低于环境温度时,煤和矸石红外热图像之间的差异较大;在相同水温条件下,煤和矸石红外热图像之间的差异随着时间增加逐渐增大;煤和矸石表面温度变化均随水温升高和时间增加呈增大趋势,但矸石表面温度变化大于煤表面温度变化;当水温为18℃、时间为180 s时,煤和矸石红外热图像之间差异和温差均达到最大。这说明低温的水可作为一种传热介质,更有利于使煤和矸石之间产生较大的温差,从而实现煤和矸石红外热图像准确、快速识别。

The coal gangue recognition method based on visible light images has low accuracy and slow recognition speed.The coal gangue recognition method based on high-energy ray transmission has significant radiation,resulting in limited application.The infrared thermal imaging has advantages such as strong penetration and no influence from light.But the surface temperature of coal and gangue is relatively close at room temperature,resulting in no significant difference between coal and gangue in infrared thermal images,making it difficult to achieve good recognition results.In order to solve the above problems,a coal gangue recognition method based on water heat transfer and infrared thermal imaging is proposed.The method conducts infrared thermal imaging experiments on coal and gangue under different water temperatures(18,21,24,27,30℃).The method distinguishes between coal and gangue based on the differences in infrared thermal images and temperature changes.The experimental results show that the infrared thermal images of coal and gangue are different at different water temperatures.When the water temperature is lower than the ambient temperature,there is a significant difference between the infrared thermal images of coal and gangue.Under the same water temperature conditions,the difference between the infrared thermal images of coal and gangue gradually increases with time.The surface temperature changes of coal and gangue both show an increasing trend with the increase of water temperature and time.But the surface temperature changes of gangue are greater than those of coal.When the water temperature is 18℃and the time is 180 s,the difference and temperature difference between the infrared thermal images of coal and gangue reach their maximum.This indicates that low-temperature water can serve as a heat transfer medium,which is more conducive to creating a large temperature difference between coal and gangue.The accurate and rapid recognition of coal and gangue infrared thermal images can be achieved.