Equipment for pulsed gas-and-chemical regeneration of water wells

2020 ◽  
pp. 72-76
Author(s):  
Keyword(s):  
Water Intake ◽  
Ground Surface ◽  
Field Tests ◽  
Oxygen Mixture ◽  
Stable Operation ◽  
Specific Flow ◽  
New Methods ◽  
Water Wells ◽  
Urgent Task ◽  
Chemical Regeneration

The development of new methods for the regeneration and recovery of specific flow rate of water intake wells is an urgent task. Based on many years of the experience in well operation, it has been proved that all wells eventually need to be repaired. The main reason for such work is the chemical clogging of the filter and filter zone with different chemical compounds. The average stable operation period of new wells is 2–4 years. Better cleaning of filters and filter zones in water intake wells is achieved using the combination of hydraulic, impulse and vibration attacks with subsequent or concurrent chemical treatment. At this date, none of the integrated approaches enjoys wide application due to some disadvantages. At the Belarusian National Technical University, the pulse-and-chemical regeneration equipment has been designed for water intake wells. The technology involves electrolysis-induced explosion of a hydrogen–oxygen mixture at the well mouth on ground surface, feed of the mixture to a working chamber in the well filter, filling of a chemical reagent in the filter treatment zone and explosion of the reagent medium. The equipment has successfully passed laboratory and field tests.

scholarly journals Specific Features of Water Quality Regulation In Process of its Selective Abstraction from Reservoirs

2017 ◽  
Author(s):  
Keyword(s):  
Water Quality ◽  
Water Intake ◽  
Water Mass ◽  
Water Volume ◽  
Stable Operation ◽  
Ansys Fluent ◽  
Active Rules ◽  
Quality Regulation ◽  
Mass Stratification ◽  
Selective Intake

Issues of effectiveness enhancement of the water selective intake for solution of drinking water supply problems with the Perm Chusovaya water intake as a study case have been discussed. Abstraction of water with the best consumption properties is of significant interest in the case of stable vertical water mass stratification. If water with the required properties locates in the upper layers establishment of bottom barriers around water intake head walls to cut off water intake from near-bottom layers is the most effective tool. At this the barrier parameters are to be determined by both the taken water volume and the height of the “discontinuous jump layer” position that define the water mass boundary. The barrier parameters are to be in accordance with the currently active Rules of Reservoirs Exploitation. Field and computation experiments have been carried out to elaborate the technique of stable intake of water with the required consumption properties. A series of computation experiments on impact of water intake amount on the taken water quality has been carried out in 3D with ANSYS Fluent package of computation hydrodynamics. The task was solved within the frameworks of non-stationary isothermal approach. Conclusions concerning both water quality enhancements in the conditions of significant chemical/physical properties’ heterogeneity by depth and provision of effective and stable operation of selective water intake have been obtained.

scholarly journals Static and dynamic analysis of the interface between the transport structure and the approached embankment

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Stanislav Tserekh ◽  
Igor Ovchinnikov
Keyword(s):  
Boundary Conditions ◽  
High Speed ◽  
Ground Surface ◽  
Rolling Stock ◽  
Stable Operation ◽  
Base Surface ◽  
Detailed Model ◽  
Static And Dynamic Analysis ◽  
Artificial Structure ◽  
Loading Scheme

The article is devoted to the analysis of static and dynamic calculation of the interface of an approach embankment to artificial structures, such as a railway bridge and culverts? the main indicator of the stable operation of an approach embankment to an artificial structure is the stiffness of the base. Calculations are performed in the Midas software package, taking into account the interface of the transition sections from the unfixed roadbed to its fortified part with bored piles and the bridge abutment. A static loading scheme with a C14 time load and a dynamic loading scheme for an approach embankment with a time load from a high-speed train (South Korean KTX20 cars standard norms – 17,335 tons per wheel, 34,67 tons per axle) are considered, and the results are analyzed and compared. The analysis of calculation results is made. The boundary conditions are taken as "Springs on the base surface" – "Ground Surface spring". This function allows you to automatically create elastic or viscous boundary elements that are necessary for performing dynamic calculations. When selecting a grid, boundary conditions are automatically created on the left/right border of the selected grid, and an elastic constant is automatically calculated based on the material properties assigned to the elements. Based on the research, recommendations were made for the development of a detailed model, taking into account the dynamic impact of rolling stock on an artificial structure.

scholarly journals Investigation of the influence of modification of the working tool for the manufacture of niobium case products

2021 ◽  
Vol 2094 (4) ◽  
pp. 042006
Author(s):  
E Yu Remshev ◽  
Z N Rasulov ◽  
S A Voinash ◽  
V A Sokolova ◽  
I A Teterina ◽  
...  
Keyword(s):  
Significant Proportion ◽  
Machine Building ◽  
Test Cycle ◽  
New Methods ◽  
Urgent Task ◽  
Main Production ◽  
The Stability ◽  
Cold Stamping

Abstract The main production of machine-building enterprises of various industries is the production of metal parts and products, 90-95% of which are manufactured using metal processing by pressure. Ensuring the stability of the technological processes of cold stamping is impossible without the use of interoperative coatings, which play the role of lubrication, preventing the diffusion “setting” (interpenetration at the atomic-molecular level) of the processed materials and tools. Therefore, one of the tasks in constructing the technology for manufacturing parts from these materials is to conduct a test cycle to establish the most acceptable coatings at the intermediate stages of processing. In the process of studying the operability and manufacturability, it is also advisable to use new methods for evaluating quality indicators at separate stages of processing semi-finished products and at the stages of control of finished products, which allows practically eliminating defects due to internal defects, ensuring the uniformity of the microstructure and predicting the operability of finished products during operation. Ensuring the quality of stamped semi-finished products made of refractory metals (niobium, molybdenum) is an urgent task due to the significant proportion of defects during cold stamping of these parts.

scholarly journals Evaluation of Ground Surface Pregrouting in a Mountain Tunnel Based on FAHP

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Changan Zhu ◽  
Runfang Sun ◽  
Hua Xu ◽  
Yiwei Liu ◽  
Zhuang Chen
Keyword(s):  
Quality Evaluation ◽  
Ground Surface ◽  
Field Tests ◽  
Analytic Hierarchy ◽  
Quality Classification ◽  
Final Score ◽  
Hierarchy Process ◽  
Mountain Tunnel

The quality of ground surface pregrouting (GSPG) is commonly qualitatively evaluated using single factor; however, the quality evaluation involves numerous facets, and a quantitative evaluation is rare. The aim of this study was to quantitatively evaluate the quality of a GSPG based on three aspects. The fuzzy analytic hierarchy process (FAHP) was adopted to obtain the final score and quality classification of the GSPG. Based on three aspects, namely, integrity, continuity, and sturdiness, a series of field tests was also conducted, qualitatively evaluating the quality of the GSPG preliminary, to obtain the required test data and verify the FAHP results. The results of the FAHP showed that the quality of the GSPG was 86.42, which could be classified as “Good”, whereas the field tests exhibited that the GSPG was effective, thereby verifying that the FAHP was reliable. In addition, the proposed method provided a detailed comprehension of the quality evaluation of GSPG and a frame of reference for analogous engineering.

scholarly journals Harmonic Overvoltage Analysis of Electric Railways in a Wide Frequency Range Based on Relative Frequency Relationships of the Vehicle–Grid Coupling System

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6672
Author(s):  
Qiujiang Liu ◽  
Binghan Sun ◽  
Qinyao Yang ◽  
Mingli Wu ◽  
Tingting He
Keyword(s):  
Resonant Frequency ◽  
Simulation Analysis ◽  
Field Tests ◽  
Sampling Frequency ◽  
Wide Frequency Range ◽  
Switching Frequency ◽  
Stable Operation ◽  
Frequency Range ◽  
Traction Network ◽  
Coupling System

Harmonic overvoltage in electric railway traction networks can pose a serious threat to the safe and stable operation of the traction power supply system (TPSS). Existing studies aim at improving the control damping of grid-connected converters, neglecting the impedance frequency characteristics (IFCs) of the actual TPSS. The applicable frequency range of these studies is relatively low, usually no more than half of the switching frequency, and there is a large gap with the actual traction network harmonic overvoltage frequency range of 750 Hz–3750 Hz. In this paper, first, the IFCs of the actual TPSS in the wide frequency range of 150 Hz–5000 Hz are obtained through field tests, and the resonant frequency distribution characteristics of TPSS are analyzed. After that, the aliasing effect of the sampling process and the sideband effect of the modulation process of the digital control of the grid-connected converter are considered. Based on the relative relationships among the inherent resonant frequency of the TPSS, sampling frequency and switching frequency, an impedance matching analysis method is proposed for the wide frequency range of the vehicle–grid coupling system. By this method, the sampling frequency and switching frequency can be decoupled, and the harmonic overvoltage of traction network in the frequency range of two times switching frequency and above can be directly estimated. Finally, the method proposed in this paper is validated by the comparative simulation analysis of seven different cases.

Technological framework for the reversible chemical regeneration of water wells

2020 ◽  
pp. 76-80
Author(s):  
I. E. Amelishko ◽  
◽  
V. V. Ivashechkin ◽  
Keyword(s):  
Laboratory Research ◽  
Rural Settlements ◽  
Efficient Treatment ◽  
Water Wells ◽  
Displacement Pump ◽  
Pneumatic Displacement ◽  
Chemical Regeneration ◽  
The Republic ◽  
The One ◽  
Time Required

Groundwater is mainly used for water supply of cities, rural settlements and industries in the Republic of Belarus. About 90% of water wells operate at reduced specific production rates as a consequence of biological and chemical clogging. Due to the insufficient efficiency of existing regeneration methods, the average service life of water wells rarely exceeds 18–20 years, which is significantly shorter than the estimated life. In this regard, creation of the effective and simple regeneration methods is becoming an urgent scientific and practical problem of great importance. A reversible pulse-and-chemical regeneration assembly has been designed for water wells; it consists of a compressor, hoses and a submersible device in the form of a two-chamber pneumatic displacement pump. The advantage of this assembly is the absence of a circulation pump in its configuration and the possibility of efficient treatment of a limited filter interval. A technology for the regeneration of water wells using the reversible pulse-and-chemical regeneration assembly is proposed. The installation, hoisting and other related operations should be carried out using a truck crane with a telescopic lifting boom. The reagent can be universal acid cleansing agent Deskam TU RB 37430824.001-97. One of the advantages of water well regeneration using the proposed assembly is the reverse movement of the reagent in gravel filter. Two regeneration modes were tested on a laboratory scale: the reversible flow and one-way flow of the reagent. The analysis of the laboratory research data shows that the use of the reversible mode of the reagent movement significantly reduces the cleaning time required for the removal of colmatant from the gravel filter as compared with the one-way flow of the reagent.

Field Adjustment of Hydraulic-Turbine Governors

1961 ◽  
Vol 83 (1) ◽  
pp. 61-64
Author(s):  
C. L. Avery
Keyword(s):  
Field Tests ◽  
Hydraulic Turbine ◽  
Stable Operation ◽  
Limited Capacity

This paper discusses certain aspects of the adjustment of hydraulic-turbine governors for stable operation on a-c networks and describes a series of field tests performed to determine satisfactory adjustment of units operating on a network of limited capacity.

scholarly journals A wireless monitoring system for a high-power borehole–ground electromagnetic transmitter

2019 ◽  
Vol 8 (1) ◽  
pp. 13-19 ◽  
Author(s):  
Shuangshuang Cheng ◽  
Ming Deng ◽  
Meng Wang ◽  
Sheng Jin ◽  
Qisheng Zhang ◽  
...  
Keyword(s):  
Monitoring System ◽  
Field Tests ◽  
Stable Operation ◽  
Support Condition ◽  
C Language ◽  
Wireless Monitoring ◽  
Operation Control ◽  
Electromagnetic Transmitter ◽  
User Friendly ◽  
Visual Interfaces

Abstract. Visual interfaces and wireless monitoring have played significant roles in the application of electromagnetic transmitters. Therefore, we have designed a wireless monitoring system that is based on the Visual Studio 2015 Windows form application by using C# language and multi-threading technology. The system can effectively implement many functions, including time monitoring via a real-time clock, switching of the transmitting frequency, changing of transmission mode, and the storage and verification of the transmitter condition information. These things allow the wireless monitoring system to support condition monitoring and operation control of the transmitter. The results of several field tests confirm that the proposed wireless monitoring system provides a user-friendly interface and convenient and stable operation. The system is able to satisfy the wireless monitoring and multifunctional demands for transmitters implemented in land electromagnetic exploration and act as a reference for scientific researchers pursuing instrument development and electromagnetic prospecting.

Stiffness and strength changes in cohesionless soils due to disturbance

1992 ◽  
Vol 29 (5) ◽  
pp. 853-861 ◽  
Author(s):  
Thomas G. Thomann ◽  
Roman D. Hryciw
Keyword(s):  
Shear Strain ◽  
Strain Amplitude ◽  
Ground Surface ◽  
Field Tests ◽  
Horizontal Stress ◽  
Stress Index ◽  
Cohesionless Soils ◽  
Dense Sand ◽  
Tip Resistance ◽  
Shear Strain Amplitude

A laboratory and field study of stiffness and strength changes to cohesionless soils due to disturbance has been performed. Laboratory samples were tested in a resonant column torsional shear device. The magnitude of the stiffness loss in laboratory samples was found to be primarily a function of the imposed shear strain amplitude. The time for the stiffness to regain values prior to disturbance also appears to be controlled by the shear strain amplitude. In field tests, decreases in soil strength and stiffness were observed following an explosive detonation in a partially saturated, medium-dense sand. Although there were no measured changes in the soil density, the ground surface elevation, and the dilatometer horizontal stress index, the cone tip resistance and shear wave velocity decreased noticeably. Subsequent time-dependent increases in penetration resistance were observed; however, at certain locations, the increases were not large enough to offset the initial decreases. Comparisons are made between changes in the laboratory and field stiffness values following disturbance, and possible explanations for the behavior are presented. Key words : soil dynamics, disturbance, shear strain amplitude, in situ testing, shear modulus, time effects.

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