Device and method for controlling the fuel-air ratio during...

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

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F23K 1/00 (2006.01) F23K 3/02 (2006.01) F23N 1/02 (2006.01) F23N 5/18 (2006.01) F23N 5/20 (2006.01) G01P 5/18 (2006.01)

Patent

CA 2729863

The invention relates to a device and method for controlling the fuel-air ratio during the combustion of ground coal in the firing system of a coal power plant, which comprises means for the pneumatic delivery of ground coal to the burners of the firing system of the coal power plant and means for feeding combustion air to the burners or into the firing chamber of the firing system of the coal power plant and in which the amount of combustion air and the amount of carrier air is controlled. The aim of the invention is to achieve a high reliability of the control combined with low maintenance of the air mass measurement devices for measuring the amount of combustion air and carrier air. According to the invention, this aim is achieved by a measurement device for measuring the amount of combustion air which, according to the correlation measurement method, evaluates the triboelectric effects on sensors which are arranged in series in the direction of flow of the combustion air and thus measures the flow velocity of the combustion air. To this end, between 0.1mg and 10mg of fine-grained particles having a particle diameter of between 20 µm and 200 µm are introduced per m3 air into the suctioned fresh air. The introduction of particles into the suctioned fresh air is carried out essentially during the starting phase of a firing system of a coal power plant. The measurement of the amount of carrier air is preferably carried out by means of a correlation measurement device that evaluates the triboelectric effects on sensors which are arranged in series in the carrier air stream in the direction of flow of the carrier air.

L'invention concerne un dispositif et un procédé de régulation du rapport air-combustible lors de la combustion de charbon broyé dans une installation de combustion d'une centrale au charbon, comprenant des moyens permettant l'acheminement pneumatique du charbon broyé vers les brûleurs de l'installation de combustion de centrale au charbon ainsi que des moyens permettant l'apport d'air de combustion aux brûleurs ou au foyer de l'installation de combustion, le volume d'air de combustion et le volume d'air de transport étant régulés. Le but de l'invention est de permettre une régulation très fiable pour un minimum d'entretien des dispositifs de mesure des volumes d'air de combustion et d'air de transport. Selon l'invention, ce but est atteint au moyen d'un dispositif de mesure du volume d'air de combustion, qui évalue, selon la méthode de mesure par corrélation, les effets triboélectriques sur des capteurs placés dans le flux d'air de combustion les uns derrière les autres dans le sens d'écoulement de l'air de combustion et mesure ainsi la vitesse d'écoulement de l'air de combustion. A cet effet, 0,1 à 10 mg de particules à grains fins par m3 d'air, lesquelles particules présentent un diamètre compris entre 20 µm et 200 µm, sont introduites dans l'air frais aspiré. En particulier, des particules ne sont introduites dans l'air frais aspiré que pendant la phase de démarrage d'une installation de combustion de centrale au charbon. De préférence, le volume d'air de transport est mesuré au moyen d'un dispositif de mesure par corrélation, qui évalue les effets triboélectriques sur des capteurs placés dans le flux d'air de transport les uns derrière les autres dans le sens d'écoulement de l'air de transport.

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