Catalytic hydrogen and methane in dry gas
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As we all know, heavy metal nickel has dehydrogenation effect. The hydrogen to methane ratio is generally used to characterize the degree of heavy metal pollution of the catalyst. However, the absolute content of methane represents the depth of reaction. In order to maintain a more appropriate depth of reaction and metal content of the balancer, what is the appropriate volume of hydrogen and methane in dry gas under normal circumstances? According to my operating procedures, the absolute content of hydrogen (volume %): 26.75, methane is 24.31. Everyone is welcome to contribute!
Our device mainly depends on the hydrogen-to-methane ratio in dry gas, which is generally required to be less than 2, and the volume content of hydrogen and methane is about 20%.
In our recent dry gas analysis, the volume composition of hydrogen was 33%, which is much larger than yours.
Project dry gas time 8:00 Hydrogen% 43.08 Oxygen% Nitrogen% 27.82 Carbon monoxide% 0.6 Carbon dioxide% 3.01 Methane% 9.38 Ethane% 9.21 Ethylene% 5.37 Propane% 0.23 Propylene% 1.30 Isobutane% n-butane% n-butene% isobutylene% trans-butylene% Butene % is less than or equal to C2% 23.96 ≥C3% 1.53 ≥C5% 0.00 Total % 100.00 This is a set of data for the dry gas of my device. The heavy metal content of the catalyst is as high as 15000-16000ppm.
The following dry gas composition of our plant is H2 O2 N2 C1 C2 C2＝ C3 C3＝ C4 C4＝ C5 C6 CO2 CO ∑ (V)% 28.38 0.37 20.79 16 10.49 14.73 0.42 3.12 0.41 0.83 0.25 0 3.71 0.5 100.00
Generally h2/ch4 will not exceed 2, such as Chengkang on the fourth floor. Judging from the dry gas, there is already a problem with your catalyst and the passivator is no longer working.
Haha, then mine is good, right? The passivator is DMP-1, but the filter is often clogged and needs to be cleaned. I don’t know if there is any good way. There is also h2/ch4. Generally, the smaller the better? What impact does it have
Of course, the lower the hydrogen content, the better, because dehydrogenation is mainly caused by metallic nickel. A low hydrogen content indicates a low nickel content.
This does not mean that the smaller the data, the better, because adding too much passivating agent increases the unit consumption of the device. The reason is that the filter is often clogged. Our device uses diesel as the diluent to prevent the passivating agent nozzle from clogging.
Hydrogen oxygen nitrogen methane ethane ethylene propane propylene isobutane n-butane hydrogen sulfide butylene isobutylene trans-butylene male isopentane n-pentane total pentene CO2COC6 components total 22.18 3.42 31.88 16.92 8.15 8.55 0.09 0.54 0.28 0.17 2.51 0.19 0.29 0.26 0.20 0.58 0.12 2.16 1.14 0.37 100.00 The dry gas composition of our device, as shown in the table above, the hydrogen-to-methyl ratio is generally less than 2. Generally, for water-soluble passivants, we dilute them with an appropriate amount of water, and for oil-soluble ones, use light diesel oil. At the same time, in order to prevent the continuous replenishment of light diesel oil at the back of the outlet of the passivator pump, it can prevent freezing and condensation, and secondly, when the passivator suddenly stops the pump, it can prevent the raw material from backflowing and condensing the passivant injection pipeline.