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Bangladesh textile industry has started waste heat recovery systems.

With the progressive trend of fuel prices as well as the thriving concern for a better and cleaner environment, global industries are opting for new technologies which are more environmentally friendly and at the same time economic.

Bangladesh textile industry is also in the quest for such technology. They have started the operation of a method called waste heat recovery systems. This technology is focused on reusing the dissipated heat produced by the system into it to lessen energy consumption and to make it more competitive in the business. It was presented by a programme of International Finance Corporation (IFC) called Partnership for Cleaner Textile (PaCT) in 2013.

Figure:1Bangladesh textile industry is also in the quest for such technology

Bangladesh textile and apparel sectors were using modern and efficient power technologies. But it seemed like the energy efficacy was still behind the optimum. The residues like high-temperature gas discharge from power generators, boilers, and finishing machines was never thought to be corrected and reused as an additional energy input. Waste heat utilization made it simple to capture the heat which was usually frittered away in the air and then to transfer it back to the system through a process using gas or liquid as an extra energy source.

The process requires a waste heat recovery boiler with a significant capacity to be run by hot exhaust from onsite electricity generators. A boiler with a capacity of 2.70 t/h is estimated to save 15,094 MWh of energy and energy cost of USD 141,280 annually. An installed economizer can reduce 4.9% of boiler fuel consumption and a heat exchanger can save approximately 10% of energy used in a center-setting machine.

According to the PaCT, 338 Bangladeshi factories are using the WHR systems and are successful over reduced gas consumption by 1.26%. They have efficiently pulled in gas usage from 12,91,122 cubic meters to 12,74,983 cubic meters.

Industry adopters of this technology said they have encountered significant positive changes in their businesses. The Managing Director of DBL group, MA Jabbar said currently said to a national newspaper, “By using exhaust gas boilers, we have reduced natural gas consumption and increased engine’s overall performance and annual savings of $1.04 million”.

According to the Managing Director of Malek Spinning Mills A Matin Chowdhury, where the industry efficiency of overall gas consumption is 81% to 86%, the combined cycle power plant run sections have higher efficiency of 47% to 52%.

In addition, another company named Fakir Apparels is enjoying $208,615 of annual savings from waste heat utilization technology, which is also the reason for the reduction of the company’s energy and boiler fuel demand by 27,456 kWh/year and 2,595,840 m3/year, respectively.

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