A method for determining the oxygen content of steam methane reforming hydrogen production unit
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A technology for reforming a hydrogen production device and water vapor, which is applied in measurement devices, instruments, scientific instruments, etc., can solve problems such as increasing production costs and reducing heat utilization, and achieves increased fuel utilization, wide applicability, and calculation. accurate effect
Inactive Publication Date: 2017-02-01
SHANGHAI HUALIN IND GASES
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If the value of the measuring instrument is inaccurate, but it has not caused a huge change in air volume, long-term operation under this condition will reduce the heat utilization rate and increase production costs
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Embodiment 1
[0032] The load of HYCO unit is hydrogen production 6800Nm3 / h, water-carbon ratio 3.619, air excess coefficient 1.24, natural gas flow rate 122Nm3 / h, analytical gas flow rate 4629Nm3 / h, PSA operation factor 0.644, air coefficient required for analytical gas 1.982.
[0033] The calculated oxygen content is 3.11%, the actual 3.15%, and the difference is less than 0.1%. Due to the error of the instrument and other air blowing equipment, it can be determined that the instrument is accurate and the combustion utilization rate is high.
Embodiment 2
[0035] The load of HYCO unit is 16000Nm3 / h hydrogen production, 2.743 water-carbon ratio, 1.3 excess air coefficient, 256Nm3 / h natural gas flow rate, 9136Nm3 / h analytical gas flow rate, 1.05 PSA operation factor, and 2.48 air coefficient for analytical gas
[0036] The calculated oxygen content is 1.738%, the actual 1.64%, and the difference is less than 0.1%. Due to the existence of instrument errors and other blast equipment errors, it can be determined that the instrument is accurate and the combustion utilization rate is high.
Embodiment 3
[0038] The load of HYCO unit is 18786Nm3 / h hydrogen production, 2.723 water-carbon ratio, 1.253 excess air coefficient, 299Nm3 / h natural gas flow rate, 10633Nm3 / h analytical gas flow rate, 1.05 PSA operation factor, and 2.48 air coefficient for analytical gas
[0039] The calculated oxygen content is 1.25%, the actual 1.16%, and the difference is less than 0.1%. Due to the existence of instrument errors and other blast equipment errors, it can be determined that the instrument is accurate and the combustion utilization rate is high.
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Abstract
The invention relates to a method for determining the oxygen content of a device for steam-methane reforming for hydrogen production. The method is as below: collecting the flow of natural gas and analytical gas in the device for steam-methane reforming for hydrogen production; calculating the amount of air needed for combustion by using the flow of natural gas and analytical gas; calculating the oxygen content by using the amount of air needed for combustion; and comparing the calculated oxygen content and the data detected by an oxygen content measuring instrument, so as to finish the determination of the oxygen content of the device for steam-methane reforming for hydrogen production. Compared with the prior art, the method provided by the invention gives comprehensive consideration of the influence factors and accurately calculates, can accurately obtain the accuracy of the oxygen content measuring instrument, increases fuel utilization rate and can be used in the calculation of the existing conversion furnace. Once the air quantity changes in the operation, the reason of fault can be determined rapidly.
Description
technical field [0001] The invention relates to a method for judging the oxygen content, in particular to a method for judging the oxygen content of a steam methane reforming hydrogen production device. Background technique [0002] The HYCO unit is a steam methane reforming hydrogen production unit, which uses water vapor as an oxidant and converts natural gas into hydrogen, carbon monoxide and carbon dioxide under the action of a nickel catalyst. Its main equipment includes TSA (temperature swing adsorber), reformer, PSA (pressure swing adsorber), waste heat boiler, steam drum, heat exchanger, condensate separation tank, etc. In the hydrogen cost composition of the natural gas steam reforming hydrogen production unit, raw material and fuel costs account for 80% of the hydrogen cost, and power consumption, catalyst and chemical agent consumption, overhaul depreciation costs, and labor costs only account for about 20%. However, the key equipment that affects the conversion ...
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