Sootblower nozzle assembly with an improved downstream nozzle

B - Operations – Transporting – 05 – B

Patent

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Details

B05B 1/02 (2006.01) B08B 3/02 (2006.01) F28G 1/16 (2006.01) F28G 3/16 (2006.01)

Patent

CA 2366806

The present invention discloses a new design of the nozzle and the lance tube of a sootblower to clean the interior of a heat exchanger by impingement of a jet of cleaning medium. In accordance with the teachings of the present invention the sootblower design developed, incorporates a nozzle at the tip of the distal end of the lance tube (downstream nozzle). The lance tube also includes an upstream nozzle positioned opposite and longitudinally apart the distal end nozzle. This design allows for the flow of the cleaning medium to enter into the inlet end of the nozzle without coming to a haft at the end of the lance tube. Further, the present invention also provides for a converging channel to be disposed in the interior of the lance tube to direct the flow of cleaning medium passing the upstream nozzle into the inlet end of the downstream nozzle with minimal hydraulic losses and flow maldistribution. The present invention also discloses an airfoil body to be placed around the upstream nozzle to minimize the flow disturbances caused by the bluff body of the converging channel.

L'invention décrite dans le présent document porte sur un nouveau design de tuyère et de tube de lance pour un souffleur de suie servant à nettoyer l'intérieur d'un échangeur de chaleur en y projetant un jet de nettoyant. Selon l'invention, le concept de souffleur de suie mis au point comprend une tuyère au bout de l'extrémité distale du tube de lance (tuyère en aval). Ce dernier est aussi muni d'une tuyère en amont montée dans le sens contraire à l'écart de l'axe longitudinal de son pendant de l'extrémité distale. Ce concept fait en sorte que le flux de nettoyant entre dans l'orifice d'admission de la tuyère sans atteindre un manche situé à l'extrémité du tube de lance. L'invention prévoit en outre la mise en place d'un canal convergeant à l'intérieur du tube de lance pour orienter le flux de nettoyantqui passe par la tuyère en amont vers le bout de l'orifice d'admission de la tuyère en aval de façon à causer un minimum de pertes hydrauliques et de mauvaise distribution du flux. On y décrit aussi un corps de profilé aérodynamique à monter autour de la tuyère en amont pour réduire les perturbations de flux causées par le corps non profilé du canal convergeant.

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