Waste-heat recovery potential in Turkish textile industry: Case study for city of Bursa (original) (raw)
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Waste Heat Recovery from Boiler of Large-Scale Textile Industry
American Journal of Environmental Sciences, 2013
Many industrial heating processes generate waste energy in textile industry; especially exhaust gas from the boiler at the same time reducing global warming. Therefore, this article will present a study the way to recovery heat waste from boiler exhaust gas by mean of shell and tube heat exchanger. Exhaust gas from boiler dyeing process, which carries a large amount of heat, energy consumptions could be decrease by using of waste-heat recovery systems. In this study, using ANASYS simulation performs a thermodynamics analysis. An energy-based approach is performed for optimizing the effective working condition for wasteheat recovery with exhaust gas to air shell and tube heat exchanger. The variations of parameters, which affect the system performance such as, exhaust gas and air temperature, velocity and mass flow rate and moisture content is examined respectively. From this study, it was found that heat exchanger could be reduced temperature of exhaust gases and emission to atmosphere and the time payback is the fastest. The payback period was determined about 6 months for investigated ANSYS. The air is circulated in four passes from the top to the bottom of the test section, in overall counter-flow with exhaust gas. The front area is 1720×1720 mm, the flow length 7500 mm, the inner and outer diameter of exhaust gas is 800 mm, the tube assembly consist of 196 tubes, the tube diameter is 76.2 mm, the tube thickness is 2.6 mm, the tube length is 4500 mm, the tube length of air inner and outer is 500 mm. The result show that, the boiler for superheated type there are exhaust gas temperature is 190°C, 24% the moisture content of fuel and there are palm kernel shell 70 tons day −1 which there are the high temperature after the heat exchanger, 150°C. It was occurred acid rain. The hot air from heat exchanger process can be reduced the moisture of palm kernel shell fuel to 15%.The fuel consumption is reduced by about 2.05% (322.72 kJ kg −1 ), while the shell and tube heat exchanger outlet exhaust gas temperature decreases from 190 to 150°C.
Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020
Energy consumption in the textile industry is a significant part of the production cost. A shell-and-tube heat exchanger (STHX) was designed and manufactured for waste energy recovery from a hot-oil boiler in a textile finishing factory. An STHX with a single pass, including finned tubes and no baffle, was manufactured. By providing waste energy recovery to the applied system, air is released to the environment at 323 K instead of 525 K. Two scenarios were analyzed: (i) the designed STHX, alternatively with finned and unfinned-tube designs; and (ii) a double-pipe heat exchanger (DPHX) under the same operating conditions. These two cases were compared in terms of thermal performance. The applied system achieved an energy recovery of approximately 74.2%. The application of finned-tubes has an effect of between 11% and 24% on the total heat transfer coefficient. Applying the DPHX would provide thermal energy recovery of approximately 13% under the same operating conditions. The reason for the greater waste energy recovery when applying STHX is also shown by this analysis.
Experimental and Numerical Study of Thermal Performance of an Innovative Waste Heat Recovery System
Applied Sciences
One of the biggest challenges the world is facing these days is to reduce the greenhouse gases emissions in order to prevent the global warming. Since a significant quantity of CO2 emissions is the result of the energy producing process required in industry or buildings, the waste heat recovery is an important aspect in the fight for preserving the planet. In this study, an innovative waste heat recovery system which can recover waste heat energy from cooling liquids used in industry or in different processes, was designed and subjected to experimental investigations. The equipment uses heat pipes to capture thermal energy from the residual fluids transiting the evaporator zone and transfer it to the cold water transiting the condenser zone. The efficiency of the heat exchanger was tested in 9 scenarios, by varying the temperature of the primary agent to 60, 65 and 70 °C and the volume flow rate of the secondary agent to 1, 2 and 3 L/min. The temperature of the secondary agent and t...
Investigation of a low-grade industrial waste heat recovery system
Nowadays, while the energy prices are continuously growing, the dispositions which try to increase the energy efficiency are getting more and more important in all industrial areas. This is especially true for the energy-intensive industrial processes. Because of this, the producing companies pay more attention every year on suggesting and supporting projects, which aim to decrease the energy consumption of their own factory. One way of increasing the energy efficiency is to use the waste energy of the installations to redeem other energy sources.
Industrial waste heat recovery: A systematic approach
Sustainable Energy Technologies and Assessments
Globally one third of energy consumption is attributable to the industrial sector, with up to fifty percent ultimately wasted as heat. Unlike material waste that is clearly visible, waste heat (WHE) can be difficult to identify and evaluate both in terms of quantity and quality. Hence by being able to understand the availability of waste heat energy, and the ability to recover, there is an opportunity to reduce industrial energy costs and associated environmental impacts. A waste heat energy recovery framework is developed to provide manufacturers with a four step methodology in assessing production activities in facilities, analysing the compatibility of waste heat source(s) and sink(s) in terms of exergy balance and temporal availability, selecting appropriate heat recovery technologies and decision support based on economic benefits. The economic opportunity for industrial energy recovery is demonstrated in an industrial case study. The applicability of the framework for wider industrial application is discussed.
Potential of Waste Heat Recovery in Textile
2013
Many developing countries, including India, look forward to developing strong integrated textile industries to add value to already-available raw materials. Textile industry is one of the largest industries, which consumes energy in the form of heat. Dyeing and finishing activities are, however, energy-intensive. In many cases, these depend on imported fossil fuels. By turning to heat recovery, significant cost savings can be achieved improving profitability and competitiveness. New technologies are required to recover some percentage of loss of energy. The techniques and technologies of heat recovery from boiler blow down, condensate and waste water are analyzed. Waste heat utilization in the textile industry is gaining vital importance in the Indian textile industry as international legislations are also to come into force in our country. This paper focuses on potential of heat recovery has brought significant cost reduction in textile dyeing and processes. The focus is on steam u...
Thermo-economic analysis of heat pipe heat exchanger for waste heat recovery in thermal systems
International Journal of Exergy, 2012
ABSTRACT Thermo–economic analysis of Heat Pipe Heat Exchanger (HPHE) for waste heat recovery in thermal systems using the P1–P2 and NTU methods is presented. The optimum effectiveness of a HPHE is given as a polynomial equation, whereas the net savings and payback period are given in closed form to enable the HPHE designer to determine the optimised values directly. In addition to this, exergy analysis of HPHE for waste heat recovery in thermal systems is formulated. The variation of exergy efficiency with respect to change in inlet temperature is also presented.
Journal of Thermal Analysis and Calorimetry, 2021
The use of waste heat in thermal power plants for electricity generation and water treatment can efectively increase the overall efciency of the power plant and reduce environmental pollution due to replacement with fossil fuels. In this paper, using steam Rankine cycle (SRC), organic Rankine cycle (ORC) and single-stage desalination unit are proposed in three scenarios to apply heat losses of Khangiran gas power plant for co-generation of electricity and water treatment. These three scenarios are investigated from the energy, eco-exergy, and emergy point of view, and four organic fuids are used in ORC to achieve the best results. The results indicated that among the four working fuids considered, n-Octane has the best performance. The results also showed that at an optimum temperature of 453.55 K, the best system in terms of energy and eco-exergy would be the Scenario 1. Moreover, the results of emergy analysis showed that the best system from this point of view is scenario 3. It is noteworthy that in the results corresponding to scenario no. 3, the emergy yield ratio (EYR) and emergy index of sustainability (ESI) are 4.89 and 182.5, respectively
Waste Heat Recovery ( Energy Efficient Technique0
This report provides the basic information about the recovery of the waste heat generated from the various chemical and industrial processes which makes the whole process economically feasible, technically efficient and environmentally acceptable. Waste heat recovery is the process of utilizing the waste heat released during various processes to provide heat for existing process as well as to provide energy for the new process.