| 摘要 |
A method for revamping a front-end of an ammonia plant, said front- end comprising a reforming section (1, 2) with air-fired secondary reformer or autothermal reformer (2), a treatment section (3) of the effluent from said reforming section, and an air feed compressor (6), wherein an O2-containing stream (8) is directed to said reforming section (2) for use as oxidant, at least one nitrogen stream (9) is introduced at a suitable location of the front-end, to provide a desired molar ratio between hydrogen and nitrogen in the product gas, and at least part of said nitrogen stream (9) is compressed via said feed compressor (6). A method for revamping a front-end of an ammonia plant, said front- end comprising a reforming section (1, 2) with air-fired secondary reformer or autothermal reformer (2), a treatment section (3) of the effluent from said reforming section, and an air feed compressor (6), wherein an O2-containing stream (8) is directed to said reforming section (2) for use as oxidant, at least one nitrogen stream (9) is introduced at a suitable location of the front-end, to provide a desired molar ratio between hydrogen and nitrogen in the product gas, and at least part of said nitrogen stream (9) is compressed via said feed compressor (6). The invention relates to a method for calibrating a digital imager from a sequence of P input images (An), to which a calibration image (C_REF) is applied in order to obtain a sequence of P output images (Yn). According to the invention, the calibration is carried out by updating the calibration image (C_REF) by estimation, with n iterations, of an image (Cn) representative of the calibration image (C_REF), n being a whole number higher than or equal to 1. |
