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利用空气预热器回收低效锅炉烟气的热能，加热助燃空气，可以强化燃烧，降低灰尘污染，提高锅炉热效率，是低效锅炉技术改造行之有效的措施之一。
Utilizing air preheater to recover the heat energy of inefficient boiler flue gas and heating combustion air can enhance combustion, reduce dust pollution and increase boiler thermal efficiency, which is one of the effective measures for inefficient boiler technology reform.