| 摘要: |
| 针对浸没燃烧天然气加热装置换热器换热设计计算时,由于水浴流动及传热的复杂性给设计工作带来的问题,结合国内首例装置实际运行情况,对装置的水浴传热过程进行仿真分析,并计算验证了根据加热装置运行的实测数据,使用经典传热公式反算出的管外水浴最大流速。模拟结果直观反映了水箱内部水浴流动及烟气与水浴间的换热过程。结果 表明:①装置换热区域结构布置合理,气泡破碎效果较好,增大了高温烟气与水浴的接触面积,进而强化了气液间传热；②在换热过程中,气液两相流是以一个相对恒定的温度冲刷换热器的,换热稳定；③在换热器管壁处,烟气几乎不参与换热；④模拟计算的水浴流速最大相对误差为8.33%,为后续浸没燃烧天然气加热装置的研发和设计提供了一种可参考的计算水浴流速的数值模拟思路。 |
| 关键词: 浸没燃烧天然气加热装置 水浴传热特性 数值模拟 水浴最大流速 |
| DOI：10.3969/j.issn.1007-3426.2020.06.010 |
| 分类号: |
| 基金项目:北京市科技计划课题“高中压调压站冻堵、冻胀对安全运行影响分析及应对措施研究”(D151100005515002) |
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| Numerical simulation of heat transfer in water bath of submerged combustion natural gas heating device |
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Jian Hairui1, Shi Yongzheng1, Wang Hao2, Liu Rong1
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1. School of Environmental and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing, China;2. Beijing United Gas Engineering & Technology Co., Ltd., Beijing, China
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| Abstract: |
| When calculating the heat exchange design of the heat exchanger of the submerged combustion natural gas heating device, there esist a lot of problems in the design work, which is caused by the complexity of the water bath flow and heat transfer. Combined with the actual operation of the first domestic device, the simulation analysis of heat transfer process in water bath of the device was carried out and measured data of the heating device operation is verified by calculation. The maximum flow velocity of the water bath outside the tube is calculated inversely using the classical heat transfer formula. The simulation results intuitively reflect the flow of the water bath inside the water tank and the heat exchange process between the flue gas and the water bath. The results show that:(1) The heat transfer area of the device is reasonably arranged, the bubble breaking effect is better, and the contact area between the high-temperature flue gas and the water bath is enlarged, and the heat transfer between gas and liquid is strengthened; (2) In the heat exchange process, the heat exchanger is flushed by the gas-liquid two-phase flow at a relatively constant temperature, and the heat exchange is stable; (3) The flue gas at the tube wall of the heat exchanger hardly participates in heat exchange; (4) The maximum relative error of the flow rate of water bath for simulation calculation is 8.33%, which provides a reference numerical simulation idea for calculating the water bath flow rate for the subsequent development and design of the submerged combustion natural gas heating device. |
| Key words: submerged combustion natural gas heating device heat transfer characteristics of water bath numerical simulation maximum flow velocity of water bath |
