Final presentation on energy conservation in textile industry

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    03-Jul-2015

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1. Energy conservation in textile industry 2. Title of paper : Energy conservation experience in a textile Printing factory Author: C. Chullabodhi & s.Wangsupakukosol 3. This paper reports on the energy conservation study carried out in a textile printing factory The investigation focused on 5 process equipments namely boiler, cabinet dryer, color fixing dryer, hot water tanks, and cylindrical dryer Introduction 4. PRODUCTION PROCESSES The layout of the processes is shown 5. ENERGY CONSUMPTION Amount of steam was used as a heating medium in the drying cabinet, the colour fixing dryer, the hot water tanks and the cylindrical dryers. Electricity was used in driving pumps, fans, blowers, rollers, screw conveyors and the cylindrical dryers. ANALYSIS OF ENERGY UTILIZATION EFFICIENCY The study concentrated on thermal energy, whereby the processes that employed large amount of heat would be investigated, i.e. boiler, cabinet dryer, colour fixing dryer, hot water tanks, and the cylindrical dryers 6. Boiler horizontal fired-tube type with 7 ton/h capacity at the steam pressure of 4.92 bar. It operated 12 hours Filtered water from a nearby canal was used as feed water with no other treatment or preheat. Sawdust with the average moisture content of 31.1 % was used as fuel. By direct measurements of the amounts of feed water, fuel, ashes, unbumt carbon, and the percentages of O2 and CO in the flue gases, the boiler efficiency was found to be 48.38 % with the amount of boiler heat transfer loss being 6.32 % of the energy inputs. 7. Cont energy balance system for high heat value Boiler efficiency calculated as 8. Cabinet Dryer It was an insulated rectangular box of size, 2.4 m x 5 m x 2.45 m, with the drying heat being obtained from a set of steam pipes located at the lower half of the box. The printed fabric was fed into the cabinet, through an opening adjacent to the printing machine, at a constant rate by means of motor-driven rollers. The moisture was drawn out through a fan outlet located at the top wall. There were 2 dryers in operation. The dryer effectiveness was found to be 3.29 MJ/kg of the evaporated moisture with amount of heat loss being 12.9% of the energy units 9. The analysis of dryer performance of crreid out by energy balance equation Where, Mwp = amount of fabric moisture evaporated Hwp = Enthapy of fabric moisture at inlet hs = Enthapy of fabric of inlet steam mp = Feeeding rate of drying fabric cp = Specific heat of fabric Tpi = Temperature of entering fabric Qs = Heat loss from cabinet hw = Enthalpy from condensate steam Tpo = Temperture of cabinet fabric Hv = Enthalpy of evaporated vapour 10. Surface energy index used to performance of system SEC value of one unit dryer 2.056 Mj/kg of dry fabric 11. Color fixing dryer Energy balance equation for this system SEC value of fabric 898.1 KJ/kg 12. Hot water tanks 13. Cont. Energy balance equation SEC value can also be estimated by SEC value of fabric 10.66 MJ/kg 14. Cylindrical dryers 15. Energy balance equation for the system SEC value of fabric 3.487 MJ/kg 16. Saving opportunities 17. Saving opportunities 18. Implementations Boiler Cabinet Dryer Cabinet Dryer 19. Implementations Cylindrical Dryers 20. Implementations HotWaterTanks 21. Results and discussions 22. conclusion This paper reports on the energy conservation study carried out in a textile printing factory of 6,671 ton/year capacity. The investigation focussed on 5 process equipments namely boiler, cabinet dryer, colour fixing dryer, hot water tanks,and cylindrical dryer. After energy auditing works had been performed, 9 saving opportunities were identified, which would require invesment ranging from nothing to 2 million Baht, with the corresponding payback period of zero to the maximum value of 3.3 years. Four of the suggested measures were subsequently implemented, with the resulting saving of 5.426 million Baht per year. The process specific energy consumption value was also found to decrease by about 30%. These findings seem to indicate that there are considerable potential to improve energy utilization in this textile subsector. 23. Thank You

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