Method and apparatus for burning primary fuel

A method for burning primary fuel (F1)， wherein the primary fuel (F1) comprises at least a first compound containing nitrogen and a second compound comprising sulfur. The method comprises producing primary combustion gas (G1) having a temperature of at least 450 °C and comprising oxygen; feeding the primary fuel (F1) and the primary combustion gas (G1) to a primary process zone (Z1) of a furnace (200); feeding tertiary combustion gas (G3) to a secondary process zone (Z2) of the furnace (200); letting the primary fuel (F1)， the primary combustion gas (G1)， and/or their reaction products to move from the primary process zone (Z1) via the secondary process zone (Z2) to a tertiary process zone (Z3) of the furnace (200); and feeding quaternary combustion gas (G4) comprising oxygen to the tertiary process zone (Z3) of the furnace (200). An embodiment comprises collecting the primary fuel (F1) from a pulp process. A corresponding system.

一种燃用主燃料（primary fuel, F1）的方法，其中所述主燃料（F1）至少包含一种含氮第一化合物与一种含硫第二化合物。该方法包括如下步骤：生成温度不低于450℃且含氧的一次燃烧气体（primary combustion gas, G1）；将主燃料（F1）与一次燃烧气体（G1）送入炉膛（furnace, 200）的一次工艺区（primary process zone, Z1）；将三次燃烧气体（tertiary combustion gas, G3）送入炉膛（200）的二次工艺区（secondary process zone, Z2）；使主燃料（F1）、一次燃烧气体（G1）及其反应产物从一次工艺区（Z1）经由二次工艺区（Z2）流至炉膛（200）的三次工艺区（tertiary process zone, Z3）；将含氧的四次燃烧气体（quaternary combustion gas, G4）送入炉膛（200）的三次工艺区（Z3）。一实施例包括从制浆工艺（pulp process）中收集主燃料（F1），还包括对应的系统。