王辰龙,王杰,敬鑫,乔磊,何爱国,刘奕杉,唐洋.煤炭地下气化生产井井口装置冲蚀规律研究[J].表面技术,2023,52(5):101-110, 130.
WANG Chen-long,WANG Jie,JING Xin,QIAO Lei,HE Ai-guo,LIU Yi-shan,TANG Yang.Simulation Study on Erosion Law of Wellhead Equipment in Underground Coal Gasification Production Well[J].Surface Technology,2023,52(5):101-110, 130 |
| 煤炭地下气化生产井井口装置冲蚀规律研究 |
| Simulation Study on Erosion Law of Wellhead Equipment in Underground Coal Gasification Production Well |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.05.010 |
| 中文关键词: 煤炭地下气化 井口装置 冲蚀 数值仿真 |
| 英文关键词:underground coal gasification wellhead equipment erosion numerical simulation |
| 基金项目:中国石油天然气集团有限公司科学研究与技术开发项目[2019E-25(JT)] |
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| Author | Institution |
| WANG Chen-long | CNPC Engineering Technology R&D Company Limited, Beijing 100013, China |
| WANG Jie | School of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu 610500, China |
| JING Xin | School of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu 610500, China |
| QIAO Lei | CNPC Engineering Technology R&D Company Limited, Beijing 100013, China |
| HE Ai-guo | CNPC Engineering Technology R&D Company Limited, Beijing 100013, China |
| LIU Yi-shan | CNPC Engineering Technology R&D Company Limited, Beijing 100013, China |
| TANG Yang | School of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu 610500, China |
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| 中文摘要: |
| 目的 研究煤炭地下气化生产井口装置采气过程中，携带煤灰、煤渣的粗煤气对井口装置采气流场区域冲蚀磨损的影响规律及主要影响因素。方法 基于气–固两相流理论，采用离散相模型(DPM)描述离散固相颗粒的运动学和运动轨迹，采用雷诺–平均–纳维–斯托克斯(RANS)方程计算连续相的流体动力学特性，通过数值分析得到主要冲蚀磨损位置，以及固体颗粒粒径、颗粒质量流量、粗煤气流速的变化对采气流场区域冲蚀率的影响，并通过实验进行验证。结果 主要冲蚀磨损区域在小四通和侧阀Ⅰ的内部壁面。固体颗粒粒径为20~200 μm，小四通内壁面处，颗粒粒径为40 μm时最大冲蚀率最大，为8.7×10–7 kg/(m2.s)，是粒径为180 μm时的11.9倍。固体颗粒质量流量为2.5×10–4~12.5×10–4 kg/s，小四通内壁面处，在质量流量为12.5×10–4 kg/s时，最大冲蚀率最大，为7.3×10–7 kg/(m2.s)，是质量流量为2.5×10–4 kg/s时的5.2倍。粗煤气流速从10~20 m/s，小四通内壁面处，在粗煤气流速为20 m/s时，最大冲蚀率最大，为6.7×10–7 kg/(m2.s)，是粗煤气流速为10 m/s时的2.7倍。通过实验验证了数值分析对主要冲蚀区域预测的正确性，并且验证了堆焊能有效减轻气固两相流对装置的冲蚀。结论 小四通和侧阀Ⅰ的内部壁面受到冲蚀磨损最严重。颗粒粒径、颗粒质量流量和粗煤气产量等因素对装置的冲蚀磨损率均有较大影响，且颗粒粒径影响最大。在井口装置加工的时候，应对主要冲蚀区域做堆焊处理，在生产井口装置工程应用中，应当对小四通和侧阀Ⅰ加强监测，及时更换，并且参考分析结果对工艺流程进行相应的合理优化，尽可能地减少对装置的磨损。 |
| 英文摘要: |
| Underground coal gasification is a new type of coal mining technology, which is used to burn underground coal resources into crude gas (in which, the main component is methane, etc.). With the increasing development of UCG technology, it is imperative to demonstrate the application of on-site engineering, and it is imminent to solve the problems encountered in production of its equipment. During the use of the UCG gas production wellhead equipment, the high-speed crude gas produced will carry a large amount of solid particles, which may cause serious erosion to the gas production channel of the wellhead equipment and affect the structural strength of the wellhead equipment. In this paper, the erosion model of the high temperature production wellhead equipment was established, and the erosion law of the wellhead equipment by the crude gas with different physical properties was analyzed. And the erosion experimental program was designed to verify the numerical simulation results. The CFD model was coupled with the DPM numerical method to predict the movement of solid particles such as coal ash in the gas flow field. On this basis, numerical simulation was carried out for the effects of particle size, particle mass flow rate and flow rate of crude gas on the erosion of the wellhead equipment. The following conclusions were drawn from numerical simulations:(1) The areas where the solid particles eroded the wellhead equipment most seriously were the inner wall surface of the small four-way and the upper wall surface of the side valve I. (2) As the particle size of the solid particles increased, the maximum erosion rate first increased and then decreased, but when the particle size exceeded the critical value (160 μm), the maximum erosion rate was gradually reduced by the impact of the particle size, and the change trend of the maximum erosion rate gradually eased. At the inner wall of the small four-way, the maximum erosion rate was the largest when the particle size was 40 μm, which was 8.7×10–7 kg/(m2.s), which was 11.9 times that when the particle size was 180 μm. (3) As the mass flow of solid particles increased, the erosion area and the maximum erosion rate gradually increased, and the maximum erosion rate on the small four-way was approximately proportional to the particle mass flow. When the mass flow rate was 12.5×10–4 kg/s, the maximum erosion rate was 7.3×10–7 kg/(m2.s), which was 5.2 times that when the mass flow rate was 2.5×10–4 kg/s. (4) As the flow rate of crude gas increased, the erosion area and maximum erosion rate increased significantly with the increase of the flow rate. When the crude gas flow rate was 20 m/s, the maximum erosion rate was 6.7×10–7kg/(m2.s), which was 2.7 times that when the crude gas flow rate was 10 m/s. Through the erosion experiment, it was found that the erosion rate is the largest when the erosion angle was 20° and 30°, which further verified the correctness of the numerical simulation analysis on the prediction of the severe erosion area. Through experiments, it is found that the surfacing treatment can effectively reduce the erosion of the gas-solid two-phase flow on the wellhead equipment. During the processing of the wellhead equipment, the key erosion areas should be surfacing, and in the process of the UCG project, the small spool and side valve I should be monitored to prevent these key erosion areas from being worn to a dangerous thickness. By establishing the erosion simulation model and erosion experiment plan of the gas production channel of the UCG wellhead device, the erosion law of the gas production channel of the wellhead device can be studied, which can effectively guide the design and processing of the wellhead device. |
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