Design and Analysis of Actual Soot Cleaning System for Fire Tube Boiler

Soot blowers are used to control a boiler with high power to release dirt from the heat transfer surfaces towards the gas. They are additionally accustomed to gas pass closure. They are mechanical devices used to clean gas side boiler ash and deposits online on a periodic basis. They dictate To get rid of the ash deposited on the coil and improve the heat transfer power, the operating medium through the nozzle against the soot or ash deposited on the heat transfer surfaces on the boiler. Sort the blowers in boilers in many places such as water walls, super heaters, economists and air preheaters. Watch for heat transfer soot blowers and efficiencies do not improve. Therefore, the design and analysis of soot burners can effectively increase boiler power in power plants.

ANALYSIS OF THE FACTORS DECREASING THE EFFICIENCY OF OPERATION OF ACTIVE NOISE AND VIBRATION CONTROL SYSTEMS IN DUCTS AND THE WAYS OF IMPROVEMENT OF PROTECTION

The factors influencing on the active noise and vibration control system efficiency of operation and the ways of the system protection improvement are discussed. Analysis of factors decreasing the efficiency of operation of active noise and vibration control systems in ducts is showing that there are such factors as physical characteristics of operating medium (temperature, pressure, moisture, vibrations, dust), masking acoustic and vibrating interferences of other sources of noise and vibration etc., which may significantly reduce the efficiency, reliability and durability of active systems operation. The ways of improvement of protection of the elements of the active noise and vibration control system are discussed. Further improvement of active noise control and vibration system elements protection allows the system to operate with higher efficiency and reliability. Widely, achieving of good results in the solution of this problem helps us to extend the possibilities of active noise and vibration control systems practical application.

Application of fiber optic FBG techniques in analysis of strain in engineering machines

The paper presents the use of fiber optic FBG strain sensors for analysis of deformations of machines and devices including those used in mining techniques. FBG strain sensors have many advantages over classic strain measurements using electro resistance strain gauges. They are characterized by a significant measurement accuracy of up to 1 mm, a service life of up to 30 years, the possibility of measuring large deformations of up to 8%, significant fatigue life, the possibility of building measurement networks and, something extremely important in mining – intrinsic safety, because the operating medium is white light. The entire measurement system based on the optical interrogator was also discussed. It enables conducting both static and dynamic measurements. The results of the strain research for an engineering machine, in which the loads had exceeded 800 T, were reported.

The Impact of Damage to the Compressor on the Operating Parameters of the Pratt & Whitney 206B2 Turbine Engine

The article presents the impact of damage to the centrifugal compressor of the P&W 206B2 turbine engine, built in the EC-135p2 helicopters EC-135p2. The damages are caused by sucking the foreign bodies to the inlet, what results in the changes of exploitation parameters of the engine and thermodynamic parameters of operating medium. On the basis of the parameters, measured during engine operation, such as: rotation speed of the rotor of the compressor – n1, the rotation speed of the turbine shaft of the drive – n2, the gas temperature at the outlet of the turbine driving of the compressor – T4.2, and the fuel flow rate - m ̇_p, distributions of these parameters in various cross- sections of the engine were determined and compared. Then, on their basis, the CFD analysis of air flows in new and damaged compressors was performed.

Pretreating porcine sperm with lipase enhances developmental competence of embryos produced by intracytoplasmic sperm injection

SummaryIntracytoplasmic sperm injection (ICSI) has been widely applied in humans, mice, and some domestic animals to cure human infertility, or produce genetically superior or genetically engineered animals. However, the production efficiency of ICSI in pigs remains quite low. In this study, we developed a new sperm pretreatment method to improve production efficiency of ICSI in pigs. Experiment 1 revealed that pretreating porcine sperm with 2.5 mg/ml lipase before ICSI operation, not only can reduce the adhesion between sperm and the injection pipette without adding polyvinylpyrrolidone (PVP) in the operating medium, but also significantly improve male pronuclei (MPN) formation rate (55.56% vs. 40.00% (0 mg/ml), 42.59% (5.0 mg/ml), 40.00% (10.0 mg/ml), P < 0.05) and enhance developmental competence of ICSI embryos (26.03% vs. 10.87% (0 mg/ml), 10.00% (5.0 mg/ml), 10.13% (10.0 mg/ml), P < 0.05). Experiment 2 showed that this method has a higher MPN formation rate (50.47% vs. 30.78%, P < 0.05) and blastocyst rate (18.81% vs. 7.41%, P < 0.05) than the PVP method, and was better than the Triton X-100 treatment method (50.47% vs. 46.23%, 18.81% vs. 12.75%). Therefore, pretreating porcine sperm with 2.5 mg/ml lipase before ICSI operation is highly recommended, instead of adding PVP in the operating medium.

Novel market conditions and marketing consequences in the hungarian guided hunting sector

In Hungary the operating medium of game management and the guided hunting sector is undergoing such a radical change nowadays that on the one hand it considerably influences the profit-producing ability of the sector, and on the other hand it sets the actors of the industry new challenges and opportunities. If the Hungarian hunting industry, which has a traditional past, also wishes to preserve its position in this changed business medium, it is essential that the new situation be thoroughly assessed, and the value-oriented marketing attitude be adapted. The phenomena presented in this essay discuss the consequences and causes of the appearance of new service providers regarding the supply side, and the content changes of the consumer group and the modification of earlier consumption preferences and their causes on the demand side. The changing of the two media jointly generate the adaptation of the value-oriented service - marketing concepts, by using which the areas to be developed and deemed as the narrow cross-section of consumer decisions can be determined. After specifying the target group specific marketing properties of the aove-mentioned – prestige – service, such services of high utility content can already be established successfully that can be positioned as a proper alternative for the new consumer group of higher value expectation. On the other hand, the employment and profitability indexes related to this sector may considerably be improved.

Critical Slip in Maximum Electromagnetic Power of a Motor for Borehole Prospecting Mechatronic Devices

The extraordinary conditions for borehole motors such as: wide operating medium temperature change interval from –20oC up to +250oC, hydrostatic pressure changes from atmospheric up to 210 MPa, operating medium – dielectric liquid, limited power source, long geophysical, cable of up to 10,000 m non-constant load, due to the operating cycle have influence on their reliable operating, maximum power transmission, and change of characteristics. In this particular case, it is important to know the maximum electromagnetic power, which may be created by the motor. The critical slip and maximum electromagnetic power of the induction motor with a solid rotor supplied from a limited power-source and through the complex circuit, taking into account the parameters of the motor and supply circuit, as well as the operating peculiarities, have been derived. The study of computed characteristics of the borehole motor, taking into account the above-mentioned conditions, show that the motor supplied from a limited power-supply source and through the complex circuit should be investigated inseparably from the whole system.