scholarly journals Improving the massecuite crystallization in sugar production

2021 ◽  
Vol 83 (1) ◽  
pp. 86-93
Author(s):  
N. G. Kulneva ◽  
V. A. Fedoruk ◽  
N. A. Matvienko ◽  
E. M. Ponomareva
Keyword(s):  
Operating Mode ◽  
Steam Pressure ◽  
Small Temperature ◽  
Steam Consumption ◽  
Heating Chamber ◽  
Heating Steam ◽  
Vacuum Apparatus ◽  
Continuous Vacuum ◽  
Product Department ◽  
Entire Apparatus

The article discusses the concepts of continuous vacuum apparatus operation: vertical VKT (VKT – Verdampfungs-Kristallisations-Turm) and horizontal cascade of VKH vacuum apparatus (VKH —horizontal vacuum pan) from BMA (Germany). The advantages and features of the vertical continuous vacuum apparatus VKT are shown, as well as the possibilities for increasing the efficiency of the product department of sugar factories. Thanks to the special design of the crystallization chambers, the low massecuite level above the heating chamber and the use of mechanical stirrers in each chamber, the VKT apparatus can operate without difficulty with a very small temperature difference between heating steam and massecuite, as well as with an absolute heating steam pressure well below 1 bar. With optimal use of VKT vacuum apparatus, a variety of energy-saving schemes can be implemented, for example, double-effect evaporation in the crystallization section. Part of the secondary crystallization steam is used to heat one of the VKT units, which saves the heating steam of the evaporator unit used for this purpose. With an increase in the productivity of the sugar factory, it is possible to quickly equip the VKT apparatus with an additional chamber. The device works continuously throughout the season, especially with products with massecuite purity of more than 94%. The chambers are cleaned without stopping the entire apparatus. The boiling of massecuite of all stages of crystallization in VKT devices ensures a uniform operating mode of the food compartment, allows to achieve an increase in sugar yield and helps to reduce steam consumption at the plant.

scholarly journals Application of a Two-Stage Steam Jet Injector Unit for Latent Heat Recovery of a Marine Steam Turbine Propulsion Plant

2021 ◽  
Vol 11 (12) ◽  
pp. 5511
Author(s):  
Szymon Grzesiak ◽  
Andrzej Adamkiewicz
Keyword(s):  
Steam Turbine ◽  
Steam Pressure ◽  
Relative Increase ◽  
Parameters Optimization ◽  
Feed Water ◽  
Water Heating ◽  
Two Stage ◽  
Heating Systems ◽  
Heating Steam ◽  
Numerical Research

The paper presents the results of the numerical research of the steam jet injector applications for the regenerative feed water heating systems of marine steam turbine propulsion plants. The analysis shows that the use of a single injector for a single heat exchanger results in a relative increase in the thermal efficiency of the plant by 0.6–0.9%. The analysis also indicates the legitimacy of the usage of multistage feed water heating systems, which would enable the operating parameters optimization of the injectors. The obtained steam pressure up to the value of 1.8 barA allows for the heating of the feed water up to 110 °C. For higher degrees of feed water heating in the heat exchangers, it is necessary to supply heating steam of higher pressure. Therefore, the usage of two-stage steam jet injector units was considered advisable for the analyses.

Design of Hydraulic Dynamic Equilibrium in Household Heating System

2011 ◽  
Vol 317-319 ◽  
pp. 1429-1432
Author(s):  
Yang Min Zhou ◽  
Chao Li ◽  
Li Li Xu ◽  
Si Yi Luo ◽  
Chui Jie Yi
Keyword(s):  
Temperature Difference ◽  
Dynamic Equilibrium ◽  
Heating System ◽  
Operating Mode ◽  
Theory Analysis ◽  
Small Temperature ◽  
Control Of Flow ◽  
Flow Quantity ◽  
And Control ◽  
Large Flow

The operating mode of large flow quantity and small temperature difference is used in the traditional serial heating system, which results in a serious problem of hydraulic misadjustment, leading to visible temperature difference among different rooms. In this paper, in order to realize the hydraulic dynamic equilibrium of heating system and control of household heating, the automatic flow control valves are used for the control of flow rate. On the basis of theory analysis of hydraulic misadjustment, the results show that: the efficiency of heating system and control of household heating can be improved significantly, as well as the energy saving up to 20%.

A Calculation Method of the Optimal Initial Steam Pressure of the Power Plant Based on Model Analysis

2012 ◽  
Vol 516-517 ◽  
pp. 824-829
Author(s):  
Ning Zhao ◽  
Ya Mi Chen ◽  
Hui Jie Wang
Keyword(s):  
Power Plant ◽  
Operating Experience ◽  
Operating Mode ◽  
Steam Pressure ◽  
Work Conditions ◽  
Cooling Power ◽  
Pressure Curve ◽  
Air Cooling ◽  
Systemic Analysis ◽  
Cooling Unit

The shortage of control system for the air-cooling unit is the lack of theoretical guidance and relative operating experience in the selection of operating mode. The mathematical model is built to optimize the initial steam pressure of the air-cooling unit with the method of systemic analysis. Through calculation of air-cooling unit NZK600-16.7/537/537-Ⅰ, the optimal initial steam pressure curves in different work conditions are obtained. The analysis will improve the optimal system-wide control theory of air-cooling power plant. Limitation of the initial steam pressure curve provided by manufactory is also analyzed in this paper.

Evaporation performance: present and future in Colombian cane sugar factories

2017 ◽  
pp. 264-269
Author(s):  
D.F. Cobo ◽  
J.G. Rodriguez ◽  
A.F. Ospina ◽  
A.L. Gomez ◽  
N.J. Gil
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Performance Index ◽  
Steam Pressure ◽  
Cane Sugar ◽  
Heat Transfer Area ◽  
Improve Performance ◽  
Heating Steam ◽  
New Guidelines

Evaporation performance is usually affected by internal and external factors such as sugarcane quality, juice conditioning, exhaust steam availability, juice flow variation, heat transfer area available, type of evaporator, and geometric relationships. These factors influence the evaporation rate and cleaning frequency. An integral strategy to improve performance was proposed, including technological changes (falling-film evaporators) evaluated by simulation, on-line performance index (evaporation performance index, EPI), and new guidelines for the evaporation station configuration. EPI, proposed by Cenicaña (Colombia), is defined as the product of RDS (refractometric dry substance content) difference and juice flow divided by the product of heating steam pressure and heat transfer area. The results show that it is possible to improve performance of the third effects by extending the calandria tubes in Robert-type evaporators; this improves the heat transfer coefficient by 15–30%. In most cases, increasing juice flow velocity in evaporator tubes will increase the overall heat transfer coefficient. The use of longer tubes should be considered when modifications in evaporation stations are required. In addition, the application of EPI as a tool to assess the performance in the evaporation train and make decisions regarding the cleaning schedule was validated.

scholarly journals Central versus wellhead power plants in geothermal grid electricity generation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Moses Jeremiah Barasa Kabeyi ◽  
Oludolapo A. Olanrewaju
Keyword(s):  
Return On Investment ◽  
Electricity Generation ◽  
Power Plants ◽  
Steam Pressure ◽  
Financial Risks ◽  
Steam Consumption ◽  
Lower Efficiency ◽  
Early Return ◽  
Geothermal Wells ◽  
Geothermal Power

AbstractThe long gestation period, high upfront costs and the risks in the development of central geothermal power plants are the main reasons for the slow rate of geothermal electricity growth and its contribution to the global electricity mix. The overall objective of this study was to make a comparison between central geothermal power plants and wellhead power plants in the delivery of geothermal electricity projects. The study showed that wellhead power plants are generally less efficient compared to central power plants because of higher specific steam consumption, but are financially attractive because of the quicker return on investment, early electricity generation and the lower financial risks. The study showed that permanent wellhead power plants are a better option for geothermal wells with too low or too high steam pressure compared to others in the steam field. Temporary use of wellhead power plants as opposed to their permanent use is preferred when only limited time is available between the commissioning of a wellhead plant and the commissioning of a central power plant in the same steam field. Technical, operational and environmental challenges, including higher specific steam consumption and lower efficiency than central power plants as well as absence of geothermal fluid reinjection system make wellhead plants less economical and less sustainable in resource use. It can thus be concluded that wellhead power plants can reduce the long wait to generate geothermal electricity and make an early return on investment for investors. Both central and wellhead power plants have relatively higher capacity factor than many other power plants and so can be used to supply base load electricity for the grid or off-grid power supply. This study is a review of the central and wellhead power plants and additionally provides policy guidelines in the execution of geothermal electricity projects either as central or wellhead power plants for grid electricity generation.

Research and Application of Energy Saving Technology in Textile Warp Slashing Process

2014 ◽  
Vol 508 ◽  
pp. 223-226 ◽  
Author(s):  
Yun Tong
Keyword(s):  
High Pressure ◽  
Energy Saving ◽  
Steam Pressure ◽  
Steam Consumption ◽  
Energy Saving Technology

Discussion on application on energy saving technology in textile warp sizing, high steam pressure is used to cooking sizing glue so as to reduce the steam consumption, high pressure of squezzing roller in sizing box of sizing machine can decrease load of drying, dryng cyclinder is the best choice among various drying ways in term of energy saving.

scholarly journals Performance Evaluation of Three-Stage SSHE for Continuous Manufacturing of Burfi

2019 ◽  
Vol 38 (03) ◽  
Author(s):  
I A Chauhan ◽  
A K Dodeja
Keyword(s):  
Performance Evaluation ◽  
Electricity Consumption ◽  
Steam Pressure ◽  
Mean Value ◽  
Continuous Manufacturing ◽  
Steam Consumption ◽  
Scraped Surface Heat Exchanger ◽  
Third Stage ◽  
Three Stages ◽  
Surface Heat Exchanger

Burfi was manufactured in three-stage scraped surface heat exchanger by adding sugar directly into preheated milk by varying scraper speed in all three stages with different steam pressure in all three stages. The performance evaluation of the machine was evaluated during continuous mechanized manufacturing of Burfi. The average overall heat transfer coefficient were 1600, 950, and 410 W/m2 K for first, the second and third stage of TFSSHE, respectively. The specific steam consumption was found out to be 1.12 to 0.93 kg steam per kg of milk processed with mean value of 1 kg steam per kg of milk processed. The electricity consumption was found out to be 6.0 to 8.34 kWh per 1000 kg of milk processed with a mean value of 6.83 kWh per 1000 kg of milk processed. The sensory evaluation score of the burfi manufactured in the SSHE was obtained 20.6 out of a total of 25.

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