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我厂第二热带分厂的加热炉为侧出料三段连续式加热炉，有效长度３４．８ｍ，内宽３．４８ｍ，设计加热能力为４０ｔ／ｈ，使用１５０ｍｍ方连铸坯，以重油为燃料，采用上排烟形式。原使用换热器为片状管式，换热面积为７７２ｍ２，但外翅片间距小，密度大，表面易积灰并变硬难?
The heating plant of the second tropical factory in our factory is a three-stage continuous heating furnace with side discharge. The effective length is 34.8m, the inner width is 3.48m, the design heating capacity is 40t / h, the 150mm square slab is used, and heavy oil is used as fuel , The use of smoke on the form. The original use of heat exchanger for the sheet tube, heat transfer area of 772m2, but the outer fin spacing, density, surface fouling and harden hard?