What is three pass all wet back structure steam boiler?

2017/06/21 admin 5

Three pass all wet back structure is one international mature technology. For steam boiler, the former means smoke flow of smoke / fire tube boiler is three pass. Firstly, high temperature exhaust gas flow to the rear, then turn into frontal smoke chamber,finaly flow into the back smoke chamber.The latter (wet back) means in the first pass, boiler surface is surrounded by water ,and boiler furnace design is not leading to smoke chamber.This unique design makes the heating surface bigger and improve the steam boiler efficiency.

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