C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 3/34 (2006.01)
Patent
CA 2743089
The invention relates to a heat recovery process in the steam reforming of hydrocarbonaceous feedstocks by means of steam, in which a steam reformer generates a process gas which contains a first amount of heat and a flue gas which contains a second amount of heat, comprising at least six heat exchangers, a water treatment unit, a cooling section, a high-temperature conversion unit, at least two pressure boosting units, at least one consumer and at least one unit for subsequent processing of the resulting process gas. The generated process gas containing the first amount of heat first passes the high-temperature conversion unit, where it is, for the most part, converted into carbon dioxide and hydrogen, after which the resulting heat-containing process gas is directed into a first heat exchanger for subsequent heat transfer, and afterwards into at least two more heat exchangers which are operated as boiler feed water preheaters, product condensate heat exchangers or low-pressure evaporators, and are connected in series in any sequence desired, the process gas resulting from the low-pressure evaporator being first fed into a further boiler feed water preheater, where heat energy is transferred to a partial stream of the boiler feed water from the water treatment unit, after which the process gas obtained passes the cooling section, where it is further cooled generating a condensate flow, and finally fed into at least one unit for subsequent processing of the resulting process gas. Furthermore, a deionised water stream is sent to a second heat exchanger for being heated. The deionised water stream from the second heat exchanger is directed for degassing into the water treatment unit, the boiler feed water stream from the water treatment unit passes a pressure boosting unit and is subdivided, a first part of the boiler feed water stream being sent to the low-pressure evaporator, where a low-pressure steam is generated, and the generated low-pressure steam is subdivided and a first partial low-pressure stream is directed for heat transfer to the water treatment unit and a second partial low-pressure stream is sent to at least one consumer. A second part of the boiler feed water stream is passed through the second heat exchanger for the purpose of energy transfer and subsequently through one or more boiler feed water preheaters for being heated by the heat amount contained in the process gas and finally conveyed to the steam generation. Via a pressure boosting unit, the condensate flow from the cooling section is passed to the product condensate heat exchanger for being heated by the heat amount contained in the process gas, after which the condensate flow is heated again.
La présente invention porte sur un procédé d'utilisation de chaleur par reformage à la vapeur comprenant une unité de conversion à haute température, un premier échangeur de chaleur, et à la suite d'un dispositif de préchauffage d'eau d'alimentation de chaudière, d'un échangeur de chaleur de condensat produit et d'un évaporateur basse pression, un parcours de refroidissement, dans lequel le gaz de procédé est encore refroidi ensuite et un courant de condensat est produit et est mené à travers au moins une unité de traitement supplémentaire du gaz de procédé résultant. En outre, un courant de déionisation est produit et est mené à travers une unité de préparation d'eau, dans laquelle une première partie du courant d'eau d'alimentation de chaudière est menée dans l'évaporateur basse pression, et la vapeur basse pression générée est séparée et un premier courant partiel de la vapeur basse pression est conduit pour un transfert de chaleur dans l'unité de préparation d'eau et un deuxième courant partiel de la vapeur basse pression est mené dans au moins un consommateur. Une deuxième partie du courant d'eau d'alimentation de chaudière est menée sur un échangeur de chaleur et un ou plusieurs dispositifs de préchauffage d'eau d'alimentation de chaudière et finalement mené à la production de vapeur. Le courant de condensat sortant du parcours de refroidissement est mené sur une unité d'augmentation de pression dans l'échangeur de chaleur de condensat de produit.
Borden Ladner Gervais Llp
Uhde Gmbh
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