Добірка наукової літератури з теми "Rotor-pulsation apparatus"

Existing feed devices use methods of grinding grain and other components of the feed mixture in hammer crushers, which requires significant costs of mechanical (electrical) energy. Therefore, it is necessary to develop devices with a high degree of impact on the treated environment, which increases productivity and reduces energy consumption in technological processes. Such devices include rotor-pulsation devices, the principle of operation of which is based on the method of discrete-pulse energy input. The basis of this method is a multifactorial effect on the treated liquid homogeneous or heterogeneous medium, which consists of pressure pulsations, changes in fluid flow rate, intense cavitation, developed turbulence, hard cumulative effects, as well as high shear forces. The purpose of the study is to conduct a comprehensive analysis of kinematic and dynamic characteristics and establish the features of discrete-pulse energy input in the dispersion of grain mixtures in a rotary pulsation apparatus and develop on this basis energy-saving technology and equipment for liquid grain feed. A numerical and experimental study of heat and mass transfer processes in rotary pulsation apparatus for the preparation of liquid grain feed has been carried out. The basic hydraulic and thermal characteristics of such devices are received and geometrical characteristics of such device are defined. Experimental samples of the device for rectangular round shape of openings in the rotor-stator system are developed and made. Experimental studies of such characteristics as particle size distribution of grain feed mixture, power consumption in feed production and temperature change of water-grain mixture during its processing have been carried out.

Voltage unbalance is one of the power quality problems causing a lot of ill effects on induction motors. These are namely: Overheating, line-current unbalance, derating, torque pulsation, and inefficiency. The objective of the present work is to assess and quantify the effects of voltage unbalance on induction motors using both theory and experimentation. The analytical study is performed using the complex voltage unbalance factor model of this problem. The work deals specifically with the influence of the variations in the complex angle of the voltage unbalance factor on the stator and rotor currents, stator and rotor copper losses and total losses. The experimental investigation is carried out using an apparatus that measures currents, torque and power losses.

The given article is devoted to research of influence of polymer modifiers and mineral additives on quality of composite aerated concrete products. When selecting the composition of composite aerated concrete local raw materials and components were used: portland cement, sand, aluminum powder, polyvinyl acetate, fly ash, post-alcoholic bard and whey of milk. Preliminary polyvinyl acetate was combined with binder mixing water at a temperature above 55ºC to obtain a readily soluble polymer emulsion. Dispersion was carried out with a rotary-pulsation apparatus at a pressure of 0.5-1.0 MPa and a rotor speed of ~1200 rpm. In the same apparatus the complex modifier was produced. The offered technology of production of a complex modifier seems to be the most effective for composite aerated concrete. It made it possible to reduce water absorption and capillary suction of composite aerated concrete by an average of 25% and 45%, respectively. Moreover, different combinations of fly ash, polymer and modifier made it possible to achieve optimal values of thermal conductivity, compressive strength and frost resistance of composite aerated concrete.

There is given in this thesis a general method of calculation of power consumption for emulgation in systems liquid-liquid in small-size mixing devices (rotor-pulsation apparatuses and rotor-disc mixers). This mixing devices, have shown a high efficiency at processing of liquid-liquid systems and are wide using chemical processes. The base of calculation method is an energy ratio to describe of developed turbulent motion, pulsation intensity of which is enough for create of dispersed particles of given size and concentration, which provide a necessary surface of phases contact. It is shown, that in determination of energy consumption it is need to take in account energy dissipation processes, due to viscous friction forces, which have a significant influence at high gradients of turbulent motion. There is obtained a ratio, which connects an angular velocity of rotor rotation of mixing device and a characterized size of dispersed phase particles.There is given an experimental dependencies of consumed power of rotor-disc mixers on rotor rotations number of mixing device and characterized sizes of dispersed particles for systems water-diesel fuel. It was determined, that are decreasing of dispersed particles sizes and in increasing of volumetric flow of processing mixture a value of consumed power increases, and it is related with by increase of energy consumption for creating of interphase surface. It was determined, that a power, consumed by rotor-disc mixer, for emulsion making with averaged dispersion size of particles at range 5-25 mkm, increases by increase of rotation numbers ~n0.37. Comparison of theoretical equations and experimental data have shown adequacy of supposed calculation method of energy consumption.

Дисертація на здобуття наукового ступеню кандидата технічних наук за спеціальністю 05.17.08. – процеси та обладнання хімічної технології. − Національний технічний університет "Харківський політехнічний інститут", Харків, 2016. Дисертацію присвячено науковому обґрунтуванню та розробці напрямків інтенсифікації масообмінних процесів нафтопереробки. Показано, що при гідрокавітаційній обробці водно-вуглеводневих емульсій відбувається мікрокрекінг молекул нафти та можлива дисоціація води з утворенням водню та подальшим гідрогенолізом важких фракцій. В результаті фракційної розгонки водопаливних емульсій, що були оброблені на кавітаційному стенді, вихід легких фракцій досяг 94%, що підтверджує протікання гідрогенізаційних процесів вуглеводневої сировини, а також утворення водню при гідрокавітаційній обробці. В процесі обробки нафт та дизельного пального у кавітаторі нової конструкції було зафіксовано суттєве зниження вмісту загальної сірки до прийнятних норм, що свідчить про доцільність використання досліджуваного процесу для інтенсифікації сорбційної очистки палив від сірковмісних сполук. На основі альтернативного пального та нафти отримані гомогенні суміші, що стали джерелом світлих фракцій – сировини для отримання моторних палив. Особливо ефективним слід визнати використання цієї технології в умовах мінізаводів, напівпромислового виробництва або при доведенні некондиційного товарного продукту до вимог стандартів.
The dissertation on competition of a scientific degree of candidate of technical Sciences in the specialty 05.17.08. – processes and equipment of chemical technology. − National technical University "Kharkiv Polytechnic Institute", Kharkov, 2016. The thesis is devoted to the scientific substantiation and development directions of intensification of mass transfer processes of oil refining. It is shown that at hydrocavitation the treatment of water-hydrocarbon emulsions occur micro cracking molecules of oil and the possible dissociation of water with formation of hydrogen and subsequent hydrogenation of heavy fractions. As a result of fractional distillation of water-fuel emulsions that were processed using the cavitation stand, the yield of light fractions reached 94%, which confirms the course of hydro-genation processes of hydrocarbons, as well as the formation of hydrogen at hydro-cavitation processing. In the process of treatment of oil and diesel fuel in cavitutor new construction recorded a significant decrease in the content of total sulfur to acceptable standards, indicating the feasibility of using the investigated process for the intensification of sorption purification of fuels from sulfur-containing compounds. On the basis of alternative fuel and petroleum obtained a homogeneous mixture, which became a source of light fractions of raw material for the production of motor fuels. Partiсularly effective should be recognized the use of this technology in terms of small plants, pilot plant production or proof of non-certified commodity product to the requirements of the standards.

Дисертація на здобуття наукового ступеню кандидата технічних наук за спеціальністю 05.17.08. – процеси та обладнання хімічної технології. − Національний технічний університет "Харківський політехнічний інститут", Харків, 2016. Дисертацію присвячено науковому обґрунтуванню та розробці напрямків інтенсифікації масообмінних процесів нафтопереробки. Показано, що при гідрокавітаційній обробці водно-вуглеводневих емульсій відбувається мікрокрекінг молекул нафти та можлива дисоціація води з утворенням водню та подальшим гідрогенолізом важких фракцій. В результаті фракційної розгонки водопаливних емульсій, що були оброблені на кавітаційному стенді, вихід легких фракцій досяг 94%, що підтверджує протікання гідрогенізаційних процесів вуглеводневої сировини, а також утворення водню при гідрокавітаційній обробці. В процесі обробки нафт та дизельного пального у кавітаторі нової конструкції було зафіксовано суттєве зниження вмісту загальної сірки до прийнятних норм, що свідчить про доцільність використання досліджуваного процесу для інтенсифікації сорбційної очистки палив від сірковмісних сполук. На основі альтернативного пального та нафти отримані гомогенні суміші, що стали джерелом світлих фракцій – сировини для отримання моторних палив. Особливо ефективним слід визнати використання цієї технології в умовах мінізаводів, напівпромислового виробництва або при доведенні некондиційного товарного продукту до вимог стандартів.
The dissertation on competition of a scientific degree of candidate of technical Sciences in the specialty 05.17.08. – processes and equipment of chemical technology. − National technical University "Kharkiv Polytechnic Institute", Kharkov, 2016. The thesis is devoted to the scientific substantiation and development directions of intensification of mass transfer processes of oil refining. It is shown that at hydrocavitation the treatment of water-hydrocarbon emulsions occur micro cracking molecules of oil and the possible dissociation of water with formation of hydrogen and subsequent hydrogenation of heavy fractions. As a result of fractional distillation of water-fuel emulsions that were processed using the cavitation stand, the yield of light fractions reached 94%, which confirms the course of hydro-genation processes of hydrocarbons, as well as the formation of hydrogen at hydro-cavitation processing. In the process of treatment of oil and diesel fuel in cavitutor new construction recorded a significant decrease in the content of total sulfur to acceptable standards, indicating the feasibility of using the investigated process for the intensification of sorption purification of fuels from sulfur-containing compounds. On the basis of alternative fuel and petroleum obtained a homogeneous mixture, which became a source of light fractions of raw material for the production of motor fuels. Partiсularly effective should be recognized the use of this technology in terms of small plants, pilot plant production or proof of non-certified commodity product to the requirements of the standards.