A method for operating a heat-producing plant for burning...

F - Mech Eng,Light,Heat,Weapons – 23 – G

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F23G 5/48 (2006.01) B01D 53/68 (2006.01) F23J 15/00 (2006.01)

Patent

CA 2434898

The invention relates to a method for operating a heat-producing plant having a chamber (2) for burning chlorine-containing fuels and a channel (3) connected with said chamber, in which a plurality of consecutive heat- transferring devices (5, 5', 5") are located, which can heated by hot flue gas which flows through the channel in the direction from the combustion chamber (2) towards an outlet (4). The flue gas is conditioned by addition of a sulphur-containing additive that is injected into the flue gas downstream a combustion zone and upstream that heat-transferring device (5) being the first to be hit by the flue gas. By means of the additive, alkaline chlorides in the flue gas is sulphated, with the aim of reducing chlorine-induced corrosion of the heat-transferring devices. As additive, a compound chosen from the group: ammonium sulphate ((NH4)2SO4), ammonium bisulphate ((NH4)HSO4), ferrous sulphate (FeSO4), and sulphuric acid (H2SO4), is used, in order to form reactive sulphur trioxide (SO3) at the occasion of entrance, which is added in a quantity of at least 20 mg S/m3n (normal cubic metres) flue gas.

L'invention porte sur une méthode de fonctionnement d'une unité de production de chaleur équipée d'une chambre (2) servant à brûler des combustibles contenant du chlore et d'un passage (3) relié à ladite chambre dans lequel sont installés plusieurs dispositifs de transfert de chaleur (5, 5', 5'') consécutifs qui peuvent être chauffés par un gaz de combustion chaud qui s'écoule dans ledit passage dans le sens allant de la chambre de combustion (2) vers un orifice de sortie (4). Le gaz de combustion est conditionné par l'addition d'un adjuvant contenant du soufre et qui est introduit dans le gaz de combustion en aval d'une zone de combustion et en amont du dispositif de transfert de chaleur (5), ce dispositif étant le premier à être en contact avec le gaz de combustion. L'action de l'adjuvant permet de sulfater des chlorures alcalins contenus dans le gaz de combustion et a pour but de réduire la corrosion induite par le chlore sur les dispositifs de transfert de chaleur. Un composé est choisi, en tant qu'adjuvant, dans le groupe : sulfate d'ammonium ((NH4) 2SO4), bisulfate d'ammonium (H2SO4), sulfate ferreux (FeSO4), et acide sulfurique (H2SO4). Ce composé est destiné à la formation de trioxyde de soufre réactif (SO3), au moment de l'entrée, qui est ajouté dans une teneur d'au moins 20mg S/m3n (mètres cubes normaux) de gaz de combustion.

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