Papers by Keyword: Condenser

Abstract: This study aimed to design a condenser for a special application of condensing the vapor of pyrolysis process of hydrocarbon-based material such as plastic and biomass into liquid form or pyrolytic oil. Numerous condensers have been available in the market. However, a condenser cannot be selected and utilized directly for pyrolysis vapor condensation purposes. Before doing selection, the condenser must be designed first to meet the heat transfer requirements. In this work, the condenser was designed based on thermal analysis and validated with numerous published experimental data and the pyrolytic characteristics from related industry. A theoretical model is formulated for describing condensation of the pyrolysis vapor in the condenser to determine heat transfer requirement and the rate of condensation obtained. The effect of operating parameters such as cooling water rate in liters per minute (LPM) and temperature on the condensation rate was examined through an iterative procedure which rely to the heat transfer rate and the allowed pressure drop in the condenser. In this study, it was obtained that the highest cooling load is obtained when the flow rate of cooling water is 1.95 LPM. It was also obtained that the condenser effectiveness decreased of about 29.3 % with the ranges of cooling flow rate from 1.3 to 2.6 LPM

Abstract: The objective of the paper is to investigate the formation of Bio-fuel from waste plastic scrap. The experiment was carried out by converting the waste plastic into useful alternative oil by means of pyrolysis process. Main component of working model were furnace as heating coil and condenser as cooling coil tube. The arrangements have made to continue the process constantly. The waste plastics have kept in furnace. The furnace having heating coils which provides required heat to melt the waste plastics by three phase electric supply. Due to the high temperature in furnace waste plastics have been melted and liquefied at 350°C and formed as a vapour at 450° C. Then these vapours were sent to condenser which cools from heated vapour into liquefied oil by cooling process with slow down temperature of 30°C to 35°C. Here the vapour is fully consisting of gaseous hydrocarbons property. These hydro carbons can be used as a bio fuel after the condensation. The fuel properties were tested in reputed laboratory testing centre.

Abstract: This template analyzed the refrigerator condenser copper tube TP2 corrosion failure reason and compared the corrosion resistant performance of copper tube TP2, brass tube HSn70-1 and Cu-Ni tube B10. Copper tube corrosion is mainly caused by high concentrations of chloride, dirt and water scouring accelerated the corrosion process. The corrosion resistant performance of three copper tube is close to and unsuitable for the cooling water of the high salt content. A better corrosion resistance of stainless steel tube should be used as the replacement and needs to keep the purity of the heat exchange tube. For cooling water which easily causes fouling, the inside tubes should be smooth.

Abstract: In this paper, the mathematical model is developed for the numerical research on the condenser tubes’ relative position influence on the output temperature of a two-phase stream. The limit distance between the condenser tubes which provides the required output vapor parameters is established.

Abstract: Finite element numerical simulation software was used for numerical simulation analysis of cathodic protection of coastal power plant condenser based on physical scale model. The effects of location, size and number of auxiliary anode on the cathodic protection potential distribution of the condenser were studied, which would predict cathodic protection result of the condenser and provide reasonable design for cathodic protection of the condenser.

Abstract: Using finite element method to simulate complex operations of the whole condenser under extreme water pressure, this paper aims at predicting the strength and stiffness of the condenser components under extreme pressure conditions. The results show that the max stress of the components is less than the allowable stress, and the max deformation is also within the permitted scope. The results will provide necessary reference for the further optimization design of condenser.

Abstract: Non condensable gas (air) accumulating in the condenser will reduce heat transfer coefficient of condense and vacuum value, Reducing of condenser vacuum value will lower turbine efficiency. Chilled water spraying is adopted to cool down the steam before it is extracted through extraction opening in condenser so as to enhance extraction effect of vacuum pump. This paper gives analysis on chilled water spraying through extraction opening. Mathematic model of selected controlling volume near extraction opening is given. Maximum amount of spraying and its relationship with vacuum value and increment of extraction rate are also proposed.

Abstract: Traditional condition monitoring methods are not suitable for the nonlinear operation parameters and time-variable operation conditions. We propose an independent component analysis method based on sliding window statistics (SSWICA). This method uses statistics in sliding windows of parameters as input samples, then uses a N-step forward sliding window ICA method to modeling. Then we monitor the operating state of the equipments by observing whether the SPE index of real-time parameters exceeds the control limits. SSWICA is applied to condition monitoring of condenser in 600MW unit, comparing with traditional ICA monitoring methods based on sliding window. The results show SSWICA can accurately reflect current operating state and related changes of condensers state parameters, recognize steady, unsteady and fault conditions effectively. It is valuable for engineering practice and suitable for the application to equipments condition monitoring in power plant.

Abstract: In the thermal power plant, as an important auxiliary equipment of turbine, the condenser plays an important role in the normal operation of power plant. At present, the domestic operating unit has a large number of old condenses, which has low efficiency and emerging problems because of the increasing running time. Therefore, the transformation of old condenser becomes an important means to tap the potential of the old unit. In this paper, we transform one 300MW unit condenser with its tube layout, then through the numerical simulation and date analysis of the condenser before and after transformation to explore the possibility of modification.

Abstract: Before being put to use, a new condenser of 600 MW unit was found corrosion leakage of a large number of 304L stainless steel tubes during the water leakage test. Through field investigation, sampling, chemical composition and mechanical properties test, metallographic analysis, corrosion area surface morphology and micro area component analysis, corrosion reasons were analyzed. The main reason for corrosion is improper installation. Stainless steel tubes were polluted by rain, soil, welding slag during the installation process. Carbon steel members cut the tubes when wore tubes, and was placed in such condition for a too long time. Moreover, the electric current occurred in repair welding with water may accelerate pitting holes.