Much less attention has been focused on the particle deposition in rectifying plate though it is a common problem in shale gas pipe systems. The effects of particle parameter and flow field on the deposition and distribution of particle in a new‐type rectifying plate system are investigated. Both the computational fluid dynamics (CFD) method and the experiment method are used in order to analyze the particle deposition under various conditions. The accuracy of simulation model is verified with measurements in the experiment and from analyzing, and it is found that the Boltzmann equation can well describe the relationship between gas Reynolds number and particle deposition in the rectifying plate system. It is also found from investigation that the particle deposition is greatly affected by the particle parameter. Deposition rate rises with the increase of the particle diameter; however, it reduces gradually with the decrease of particle shape factor. Moreover, the particle mass concentration is an essential dimension that can give a prediction of where the particle may deposit.

As a common nature gas measuring tool, ultrasonic flow meter is more and more put into use. Therefore, the accuracy of measurement is what we concern the most. The performance of ultrasonic flow meter is closely related to fluid state which flows through it. This article identified the evaluation method of rectification effect of gasotron and its implementation steps. It proposed an assessing index L_min based on dichotomy. Computational fluid dynamics method is used to simulate the model of an upstream straight pipe section with a header and plate gasotron, which obtained the assessing index L_min in five different transmission conditions. Finally, the feasibility of the gasotron is validated against comparing indication errors in different installation conditions: with a header, benchmark, with a header and gasotron.

When a natural gas transmission and distribution station performs a planned or emergency venting operation, the jet noise produced by the natural gas venting pipe can have an intensity as high as 110 dB, thereby severely affecting the production and living environment. Jet noise produced by venting pipes is a type of aerodynamic noise. This study investigates the mechanism that produces the jet noise and the radiative characteristics of jet noise using a computational fluid dynamics method that combines large eddy simulation with the Ffowcs Williams–Hawkings acoustic analogy theory. The analysis results show that the sound pressure level of jet noise is relatively high, with a maximum level of 115 dB in the low-frequency range (0–1000 Hz), and the sound pressure level is approximately the average level in the frequency range of 1000–4000 Hz. In addition, the maximum and average sound pressure levels of the noise at the same monitoring point both slightly decrease, and the frequency of the occurrence of a maximum sound pressure level decreases as the Mach number at the outlet of the venting pipe increases. An increase in the flow rate can result in a shift from low-frequency to high-frequency noise. Subsequently, this study includes a design of an expansion-chamber muffler that reduces the jet noise produced by venting pipes and an analysis of its effectiveness in reducing noise. The results show that the expansion-chamber muffler designed in this study can effectively reduce jet noise by 10–40 dB and, thus, achieve effective noise prevention and control.

Peng, S.-B.; Liu, Y.; Xu, L.; Zhu, Q.-Y., and Amizi M., 2019. Optimal operation of subsea and onshore oil transmission pipeline. In: Gong, D.; Zhu, H., and Liu, R. (eds.), Selected Topics in Coastal Research: Engineering, Industry, Economy, and Sustainable Development. Journal of Coastal Research, Special Issue No. 94, pp. 475–479. Coconut Creek (Florida), ISSN 0749-0208.Pipeline is one of the most important means of oil and gas transportation, more and more subsea pipelines have been built these years. As the subsea and onshore crude oil transmission pipelines were laid many years ago, the oil pump combination schemes are complicated, which leads to high energy consumption and excessive cost in the pipeline operation. Concerning this problem, based on parameters of the pipeline and crude oil, an economical operation mathematical model for continuous transportation crude oil pipelines is set up, which taking the minimum energy consumption as the objective function, the pump combination scheme and inlet temperature of heating station as the decision variables. According to the characteristics of the model, Tabu search algorithm is used to solve the mathematical model, and an optimization software is developed by C program. Based on actual operating data, the operation scheme of a crude oil pipeline is optimized by the software. Comparison of energy consumption after optimization against those from results before optimization is illustrated. From the optimal results, it can be seen that the total operation cost after optimization is only 81.5% as before in winter, the effect is significant. Although the structure of subsea pipelines is different from onshore pipelines, the hydraulic and thermodynamic calculation methods are the same, and the optimal operation method can be used for both onshore and subsea pipelines.

In the process of shale gas extraction, fracturing technology is often used, and the extracted gas contains large amounts of sand, resulting in the risk of blockage and erosion of surface gathering equipment, which seriously affects safe production....