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As an important parameter reflecting the combustion process, temperature distribution in a furnace is related to the safety, economy and pollutant emission level of the combustion process, which is of great significance for boiler control and the study of the combustion process in the furnace. The radiation imaging method is suitable for reconstruction of furnace temperature field due to its high temporal and spatial resolution and easy implementation on site. An online measurement technology of furnace temperature field based on optical tomography is proposed. A reconstruction algorithm combining deep learning with regularization algorithm is adopted to solve the ill-posed problem in the temperature field reconstruction process. Firstly, a radiation imaging model is established according to the set parameters such as furnace size, medium radiation characteristics, and CCD camera installation position. A large amount of data is obtained through direct problem calculation. Then, the appropriate Tikhonov regularization parameter is found through an automatic optimization algorithm to construct the training data set, and the accuracy and stability of the solution are evaluated. Finally, a deep neural network model is established to predict the optimal regularization parameter and then reconstruct the temperature field. The results show that this furnace temperature field reconstruction algorithm has an error less than 5%, showing good accuracy. After adding the measurement error, the reconstruction error is within 5%, indicating that the method is robust. At the same time, this method has high computational efficiency and meets the requirements of real-time monitoring of temperature fields.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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