Method of detecting clogging and granulation method

Details Method of detecting clogging and granulation method Method of detecting clogging and granulation method

B - Operations, Transporting

01

J

B01J 2/04 (2006.01) B01J 2/16 (2006.01) B01J 8/18 (2006.01) B01J 8/24 (2006.01) B65G 53/66 (2006.01) C05G 3/00 (2006.01) C07C 273/02 (2006.01) C07C 273/14 (2006.01)

Patent

CA 2224370

There is disclosed a method for detecting clogging of air feed pipes, comprising air feed pipes (15), each having an outlet (13) for jetting air into a granulation section (1), and jetting nozzles (13), each situated at the center of the air outlet of a said air feed pipe for jetting a liquid of a molten raw material (e.g. molten urea), wherein, in jetting the liquid of the molten raw material from the jetting nozzles into the granulation section to carry out granulation, (a) an orifice section (14) is provided at a lower part of each of the air feed pipes (15), a section for taking up orifice rear pressure (16) is provided in each air feed pipe and is located downstream of the orifice section, and a section for taking up orifice forward pressure (17) is provided upstream of the orifice section, and (b) the pressure difference between the orifice forward pressure and the orifice rear pressure is measured, to detect clogging of the air feed pipes based on an abnormality in the pressure difference regarding the air feed pipes. There is also disclosed a granulation method, comprising monitoring the pressure difference by the above method, stopping the feed of a liquid of a molten raw material to the air feed pipe whose pressure difference is abnormal, and compensating the amount corresponding to the stoppage with the remaining function. The detection method is a method capable of detecting accurately a malfunction related to jetting of air in the granulation of urea or the like. Further, the granulation method is a granulation method wherein, accurately, in response to the occurrence of a malfunction related to the jetting of air, the feed of a raw material liquid to the malfunctioned section is stopped, and the raw material liquid to be fed to the jet nozzles having other normal air outlets is suitably increased, thereby allowing continuous operation, with the productivity before the occurrence of the malfunction kept.

L'invention concerne un procédé de détection d'obstruction de plusieurs tuyaux d'alimentation en air (15) comprenant des sortie (13) qui soufflent de l'air dans une section de granulation (1), et des buses (3) formées au niveaux de parties centrales desdites sorties, qui propulsent une solution de matière en fusion telle que de l'urée en fusion et similaire. Le procédé consiste: (a) à prévoir des orifices (14) au niveau de la partie inférieure des tuyaux d'alimentation en air (15), des sections de sortie de pression (16) faisant office de post-orifices dans les tuyaux d'alimentation en air du côté d'aval des orifices, et une section de sortie de pression (17) formant pré-orifice du côté d'amont des orifices; (b) à mesurer la différence entre la pression au niveau du pré-orifice et celle au niveau des post-orifices; ce afin de permettre la détection de l'obstruction des tuyaux d'alimentation en air en fonction de la différence de pression anormale dans ces derniers. Le procédé de granulation consiste à contrôler la différence de pression, à stopper l'alimentation en solution de matière en fusion dans lesdits tuyaux d'alimentation en air présentant une différence de pression anormale, et à envoyer une quantité accrue d'air dans les autres tuyaux pour compenser l'interruption. Le procédé de détection permet de détecter de manière appropriée la propulsion défectueuse d'air dans l'urée de granulation. Lorsqu'une anomalie de propulsion d'air survient, le procédé de granulation interrompt l'alimentation en solution de la partie défectueuse et augmente de manière appropriée l'alimentation en solution des autres buses d'injection dont les sorties d'air sont normales, ce qui permet de continuer l'opération sans perte de productivité par rapport à une situation normale.

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