International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 04 | Apr -2017
p-ISSN: 2395-0072
www.irjet.net
Power Saving Industrial Plant Badri Narayan Mohapatra1, Aishwarya Dash2, Dhiraj Kumar Chaubey3 Assistant Professor, ETC department of OCEM, Bhubaneswar, Odisha, India Assistant Professor, ETC department of OCEM, Bhubaneswar, Odisha, India 3 Final year B.Tech student of ETC department in OCEM, Bhubaneswar, Odisha, India 1 2
---------------------------------------------------------------------***--------------------------------------------------------------------2. DIFFERENT METHODS OF ENERGY SAVING
Abstract - The article is based on power saving industrial
plant. The bulky electrical equipments used in industrial purpose require high power to be driven. Again their maintenance and safe running process requires some more power consuming equipments to be driven simultaneously. The power requirement to drive these heavy electrical loads can neither be avoided nor be reduced due to their high wattage and heavy duty, but by making some changes to the industrial infrastructure the efficiency can be improved. In this paper some useful methods has been suggested that can be implemented in the industrial plants to run them in energy saving mode. There are various industrial sectors which undergoes various types of energy losses. Hence considering the different ways of energy losses, different solutions can be followed. Here we are representing particularly three different cases of energy losses those are generally occur in industrial plants and corresponding energy saving models are suggested. Key Words: Chemical absorption for CO2capture,Energysaving mechanism, Exergy destruction, Waste heat recovery Coal-fired power plant ,compression .
1.INTRODUCTION ( Size 11 , cambria font) Industries are increasing day by day and all of them involve the consumption of high amount of input energy. But according to law of conservation of energy,”Energy can neither be created nor be destroyed; it can only be converted from one form to another.”From this statement it is obvious that the total amount of energy available is limited but this limited amount of energy is to be used to serve for the increasing industrial requirement. So during the planning of an industrial plant it is very much essential to calculate the energy efficiency of that plant. Basically the hardware industries such as power plant implements bulky devices which requires a high amount of input energy to be driven. Also they involves high amount of energy loss in form of heat, sound or any other form of mechanical energy. The energy loss due to moving parts, frictional loss, heat loss etc. cannot be avoided in hardware industries. Such a high amount of energy involvement in an industry reduces its energy efficiency and it is always a trending research how to minimize the loss to increase the performance of the plant. Hence now a days almost all the industrial plants prefer to incorporate an energy saving mode of operation. © 2017, IRJET
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Industrial plants are having a variety of structures involving a variety of equipments depending upon their purpose. Accordingly the causes of energy loss also differ. So obviously the methods used to minimize the loss must be different for different plants. Hence there are a number of ways used to incorporate power saving method. 2.1 Energy Saving By CO2 Absorption Process This method is incorporated in those plants where high amount of CO2 emission takes place (i.e. basically in coalfired power plant). CO2 has an ability to capture the heat. Hence most of the loss in this plant is caused by this excessive amount of CO2 emission. The chemical process involved in the plant for which the CO2 emission occurs must not be avoided but the only method can be adapted to minimize the loss is CO2 absorption. The commonly used absorbents for the chemical absorption of CO2 are amine based solutions (mono ethanol amine (MEA) and di-ethanol amine (DEA)) and potassium carbonate solutions (K2CO3)[1,2]. But again another problem is that a high amount of energy is consumed during the re-extraction of the absorbents from the steam which reduces the efficiency up to a remarkable point. To compensate this reduction in efficiency some absorbent improvement methods can also be adapted. They are addition of activator to the absorbent to increase its rate of absorption, optimization of some parameters like lean solvent loading, amine solvent concentration, and the stripper operating pressure etc [5]. Also by system integration, two systems can be combined so that the waste heat from the stripped steam and CO2 compression process can be recovered to preheat the feed water [6]. From a theoretical analysis the energy and exergy balanced equation is given by Hflue,g + Qsteam + Wwork + Hwater = Hflue,e + HCOS +QC1 + QFl + QI−Cl ........... (1) Hflue,g- Enthalpy of the inlet flue gas Hwater- Enthalpy of the supplemental water Hflue,e- - Enthalpy of the ejected flue gas HCOS-Enthalpy changed by net input and output stream QCI- Heat lost in lean solvent cooler QFI- Heat lost in stripped vapour flasher QI-CI- Heat lost in inter cooler of CO2 compression EDAb&Ds- Exergy destruction related to absorption and Desorption process ISO 9001:2008 Certified Journal
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