Analyze and test the performance of double p-type and W-type radiant tube systems.
The combustion structure and combustion method of W-type and double P radiant tube heating system are analyzed, and the key technical indexes of two radiant tube heating systems such as flue gas circulation rate, tube wall temperature uniformity, fuel utilization rate and NOx are tested. The results show that the double P radiant tube combustion system has good wall temperature uniformity and remarkable energy-saving effect. It can adopt higher combustion power, reduce the number of radiant tube heating system and control module, and reduce the investment cost. It has great popularization and application value.
Development and application of W-type radiant tube rapid design system:
W-type radiant tube is a heating device widely used in industrial furnace cellar. After heating, the material expands. Due to the uneven temperature, the deformation of each part of the pipe body is different, resulting in thermal stress. The decline of the service life of the radiant tube caused by thermal stress has become a concern in the industry. Therefore, changing the material of the radiant tube, optimizing the combustion state of the radiant tube and improving the structure of the radiant tube have become the entry point to reduce the thermal stress of the industry. In order to obtain the comprehensive thermal behavior of radiant tube, we must start from three aspects: modeling, fluid combustion and heat transfer analysis; Complete the fluid structure coupling analysis. The results of fluid structure coupling analysis can evaluate whether the improvement is effective. Each 3D modeling process requires a lot of labor time. The process of importing the combustion calculation part from the three-dimensional model to solving the setting of control options is relatively complex. The fluid structure coupling analysis also needs relevant professionals to complete. Without certain theoretical and software operation expertise and sufficient patience, it is impossible to complete the design task of W radiation tube. Based on this, this paper completes the development of W-type radiant tube rapid design system. The characteristic of the system is that the whole process from modeling to thermal structure coupling analysis is encapsulated in the background, and a simple VB interface appears in front of the operator. Firstly, the general situation of W-type radiant tube and the research status at home and abroad are introduced, the existing problems of radiant tube are pointed out, and the improvement scheme is put forward. The theory of thermal analysis and the function of software are introduced. Then, it introduces the design requirements and overall design concept of the system. The system mainly includes three modules: three-dimensional modeling module, combustion calculation module and fluid structure coupling analysis module. In addition, in order to improve the portability of the system, a path selection module is added. The function of each module and the layout structure of the interface are described in detail, and the function flow chart is given. This paper focuses on many detailed problems and solutions to be solved in the process of system development, and gives some flow charts and control statements. Input the parameters into the system interface, simulate the values of different excess air coefficient, different air flow, different air preheating temperature and different wall thickness, observe its influence on the performance of radiant tube, and evaluate the software analysis results combined with theory. The results show that the analysis results are consistent with the theory. Under some combustion conditions, click the "pretreatment" button on the fluid solid coupling analysis interface, take the pipe wall temperature obtained by the fluid as the temperature load of the fluid solid coupling analysis, and conduct the thermal structure coupling analysis to obtain the comprehensive thermodynamic behavior of the radiant tube. The solution is consistent with the theory, which verifies the reliability and efficiency of the system.