Reformed gas as fuel for the initial reformer during start-up
A start-up process and reformed gas technology, which is applied in the field of reformed gas recovery and reformed gas recovery equipment produced during the start-up process of a methanol plant, can solve the problems of reducing the overall efficiency of the plant, wasting energy, increasing environmental impact, etc.
Inactive Publication Date: 2017-06-09
SAUDI BASIC IND CORP SA
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Problems solved by technology
Exhaust gas reduces the overall efficiency of the device and increases the environmental impact of device operation while wasting a lot of energy
Method used
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Embodiment 1
[0087] Processes were evaluated by using plant data. Tables 1, 2 and 3 summarize the results.
[0088]
[0089] The total reformed gas required: reformed gas: calorific value is 57520Kcal / Kgmol; natural gas: calorific value is 192930Kcal / Kgmol.
[0090]
[0091] Removing the 2.3% water requires heat exchangers, separators and filters. The power used for the heat exchanger is shown in Table 3 below:
[0092]
[0093] The chemical engineering tool Aspen Hysys-7.2 was used for calculations. According to the calculation, the total gas saving is equal to 6132MMBTU / 25h. The total reformed gas used in the start-up was 1339307 kg / 25h. The minimum and maximum flow rates of reformed gas during start-up are 18448kg / h and 84596kg / h, respectively. CO 2 The total impact is 1098MT / 25h. Hydraulic calculations provide pipe dimensions. A 14" pipe with a 40 schedule was calculated to handle this flow rate.
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The invention provides a method and equipment for recovering the reformed gas produced in the start-up process of a methanol plant. In one aspect, a method for recovering reformed gas produced during start-up of a methanol plant comprises: a) reducing the temperature of reformed gas from a methanol plant to remove at least some water from the reformed gas, said methanol plant reforming The gas contains (1) water in an amount not greater than 2.5 wt% based on the total weight of the reformed gas, (2) methane in an amount ranging from 1 wt% to 8 wt% based on the total weight of the reformed gas, (3) hydrogen , (4) nitrogen, (5) carbon dioxide, and (6) carbon monoxide; and b) using the reformed gas from which water has been removed as fuel in the steam reformer.
Description
Background technique [0001] In the existing methanol reforming process, more than 120,000 kg / h of reformed gas is discharged from the reformer (reformer) through a flaring system during normal plant start-up. Exhaust gases reduce the overall efficiency of the plant and increase the environmental impact of plant operation while wasting large amounts of energy. [0002] Therefore, there is a need for a new process that recovers reformed gas to reduce emissions of reformed gas, which reduces waste by using reformed gas as fuel during plant start-up, increases plant productivity, and at the same time reduces the carbon footprint of plant operation ( Carbon emissions, carbon footprint). Contents of the invention [0003] These and other needs are met by the present invention, in accordance with one or more of its objects, as embodied and broadly described herein. In one aspect, a method for recovering reformed gas produced during start-up of a methanol plant (methanol plant, me...
Claims
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IPC IPC(8): C01B3/32C01B3/50C07C31/04C01B3/34
CPCC01B3/34C01B3/50C01B2203/04C01B2203/0495C01B2203/061C01B2203/0827C01B2203/148C01B2203/1604C10K1/002C10K1/04C10K3/06
Inventor 谢赫扎达·胡拉姆阿里·伊萨·艾尔哈马德
Owner SAUDI BASIC IND CORP SA