Abstract:Most production technologies require a uniform flow path of liquid from pressure distribution pipelines. To achieve this goal, it is proposed to introduce polymer additives into the liquid flow or to use converging distribution pipelines with a continuous longitudinal slot in the wall. To reduce the uneven operation of the distribution pipeline during discrete liquid dispensing, it is proposed to use cylindrical output rotary nozzles with a lateral orthogonal entry of the jet into the nozzle. The problem is th… Show more
“…(2) Local frictional pressure loss The local pressure loss mainly considers the pressure loss of valves and fittings, and the local resistance coefficients of each component are shown in Table 2 [10] . The calculation of local frictional pressure loss is shown in the formula:…”
Section: Calculation Of Pipeline Pressure Loss (1) Friction Pressure ...mentioning
In order to optimize the energy structure, increase the proportion of clean heat sources, and solve the problem of high energy consumption for heating, a waste heat recovery scheme is planned to be designed, which mainly recovers the waste heat of the 700MW boilers in the thermal power plant, which can be used to heat the condensed water of the steam turbine in summer., It can be used to heat the circulating water in the heating network in winter to achieve the goal of recovering heat and reducing energy consumption. In the design process, a lithium bromide absorption heat pump is used as the main system for low-quality heat recovery, and steam is used as a driving heat source to release heat in the generator to heat a dilute solution of lithium bromide to generate refrigerant vapor, thereby achieving high efficiency, energy saving and economic benefits. the goal of. At the same time, two booster pumps (one for transport and one for standby) are added to the condensate pipeline at the inlet of the low-low temperature economizer system to achieve the purpose of boosting the condensate. This design plan adheres to the concept of energy saving and environmental protection, and proposes a technical transformation route for low-quality heat recovery and utilization projects to achieve the goals of reducing production costs and increasing corporate benefits.
“…(2) Local frictional pressure loss The local pressure loss mainly considers the pressure loss of valves and fittings, and the local resistance coefficients of each component are shown in Table 2 [10] . The calculation of local frictional pressure loss is shown in the formula:…”
Section: Calculation Of Pipeline Pressure Loss (1) Friction Pressure ...mentioning
In order to optimize the energy structure, increase the proportion of clean heat sources, and solve the problem of high energy consumption for heating, a waste heat recovery scheme is planned to be designed, which mainly recovers the waste heat of the 700MW boilers in the thermal power plant, which can be used to heat the condensed water of the steam turbine in summer., It can be used to heat the circulating water in the heating network in winter to achieve the goal of recovering heat and reducing energy consumption. In the design process, a lithium bromide absorption heat pump is used as the main system for low-quality heat recovery, and steam is used as a driving heat source to release heat in the generator to heat a dilute solution of lithium bromide to generate refrigerant vapor, thereby achieving high efficiency, energy saving and economic benefits. the goal of. At the same time, two booster pumps (one for transport and one for standby) are added to the condensate pipeline at the inlet of the low-low temperature economizer system to achieve the purpose of boosting the condensate. This design plan adheres to the concept of energy saving and environmental protection, and proposes a technical transformation route for low-quality heat recovery and utilization projects to achieve the goals of reducing production costs and increasing corporate benefits.
“…При цьому, в залежності від місцевих умов, рівень ґрунтових вод може бути як горизонтальним, так і мати певний похил вільної поверхні. Розробці методики розрахунку напірних дренажних трубопроводів, які працюють при горизонтальному рівні ґрунтових вод (РГВ) присвячено досить велику кількість теоретичних і експериментальних робіт [6][7][8][9]. Розрахунку ж даних трубопроводів, що працюють при наявності похилу РГВ, приділено недостатньо уваги.…”
A methodology for assessing the influence of the error value, which is included in the calculations of distribution pressure drainage pipelines in the case of a groundwater surface slope, is proposed in the paper. It is based on the previously obtained solutions of the system of differential equations describing the liquid movement with variable flow rate in distribution pressure drainage pipelines that operate at the horizontal level of the groundwater surface. The analysis is presented in dimensionless form. The influence of the groundwater level slope on the calculation results is estimated using the value of the relative flow variation in the initial section of the distribution pipeline and the generalized parameter of the distribution drain A, which takes into account its design and filtration characteristics. The obtained calculation formulas are quite simple and easy to use. The proposed method allows to determine the limits within which simplified dependencies for the calculation of drainage pipelines can be used, which are recommended for use at the horizontal groundwater level on the land reclamation site. At the same time, the error introduced into the calculations as a result of the adopted simplification is immediately determined. Corresponding graphs are presented in the paper to illustrate the obtained dependencies.
“…A much more complex character is demonstrated by the pattern of the flow during the operation of perforated pipelines under the mode of water collection when its flow occurs through the holes in the side wall of the pipe [11,12]. In this case, the flow of streams is carried out into a stream moving inside the channel and demolishing them in the direction of the main stream.…”
Section: Literature Review and Problem Statementmentioning
The results of an experimental study of the hydraulic friction factor of perforated pipelines that work with the collection of fluid along the path are reported. Clarification of this issue will make it possible to solve an important engineering task – to devise a reliable procedure for the hydraulic calculation of perforated pipes. The experiments were carried out on an assembled experimental bench. A steel pipeline with a perforated part of 1–3 m was investigated. Perforation holes were taken with a diameter of 3.6 and 9 mm. In the experiments, fluid flow, pressure loss, and average velocity were measured. Based on the data obtained, the values of the coefficient under study were calculated. It has been established that it is significantly larger than its values with uniform movement and is variable in length of the pipeline. Experimental dependences λcol on the value of the ratio of the velocities of the flowing jets of liquid to the average flow velocity in the corresponding section (Uh/V), as well as on the design characteristics of the channel, were obtained. It is shown that the lower value of the degree of pipe perforation corresponds to the higher values of λcol. This result can be explained by the influence of the attached flow rate on the main flow. The confirmation of this conclusion is the resulting shapes of diagrams of the average flow velocity obtained in the experiments, which differ significantly from standard diagrams with uniform motion. Obviously, additional energy is spent on the reformation of the velocities, and this causes additional head losses. Dependences were obtained for calculating the considered coefficient for prefabricated pipelines, including in the presence of transit flow rate. Their use in the calculation of the pipes under consideration will increase the reliability and efficiency of the sewage treatment plant, in which they are important structural elements
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