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Energy conservation in textile industry

Final presentation on energy conservation in textile industry

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Page 1: Final presentation on energy conservation in textile industry

Energy conservation in textile industry

Page 2: Final presentation on energy conservation in textile industry

Title of paper :

Energy conservation experience in a

textile Printing factory

Author:

C. Chullabodhi & s. Wangsupakukosol

Page 3: Final presentation on energy conservation in textile industry

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

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PRODUCTION PROCESSES

The layout of the processes is shown

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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

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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.

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Cont… energy balance system for high heat value

Boiler efficiency calculated as

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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

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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

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Surface energy index used to performance of system

SEC value of one unit dryer 2.056 Mj/kg of dry fabric

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Color fixing dryer

Energy balance equation for this system

SEC value of fabric 898.1 KJ/kg

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Hot water tanks

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Cont….

Energy balance equation

SEC value can also be estimated by

SEC value of fabric 10.66 MJ/kg

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Cylindrical dryers

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Energy balance equation for the system

SEC value of fabric 3.487 MJ/kg

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Saving opportunities

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Saving opportunities

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Implementations

Boiler

Cabinet Dryer

Cabinet Dryer

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Implementations

Cylindrical Dryers

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Implementations

Hot Water Tanks

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Results and discussions

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conclusion

This paper reports on the energy conservation study carried out in a textileprinting factory of 6,671 ton/year capacity.

The investigation focussed on 5 process equipments namely boiler, cabinetdryer, colour fixing dryer, hot water tanks,and cylindrical dryer.

After energy auditing works had been performed, 9 saving opportunitieswere identified, which would require invesment ranging from nothing to 2million Baht, with the corresponding payback period of zero to themaximum 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 byabout 30%.

These findings seem to indicate that there are considerable potential toimprove energy utilization in this textile subsector.

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Thank You