Issues related to the process before compression of 100,000 tons of coke oven gas for methanol production
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Our company is constructing a facility for producing methanol from 100,000 tons per year of coke oven gas. The current process design involves wet desulfurization first (as the desulfurization process in coking was not satisfactory, an additional unit was added); the gas holder is located afterward. Our company’s technical staff working on the coking unit have raised the question of whether the operation of the wet desulfurization unit for methanol production could affect the pressure of the recycled gas from the coking process once the Roots blower starts operating. (The minimum required pressure for the recycle stream in coking is 5000 Pa; the pressure of the gas sent to methanol production in coking can be maintained at 8000 Pa. The Roto blower has an air delivery volume of 325 m3/min, with 3 such fans in total, and the pressure increase provided by these fans is 20 kPa). From our understanding and investigations, in the production of methanol from 100,000 tons of coke oven gas, the gas holder is used first, followed by wet desulfurization, and then the coke press. In our current wet desulfurization process, the scrubber comes first and the gas holder comes later; at that time, the main consideration was to protect the coke press. Does starting a Roots blower for wet flue gas desulfurization affect the pressure of the coking furnace gas, and what are the solutions?
Is it because my question is too naive and not worth considering by the experts here, or is there simply a lack of enthusiasm among the forum users?
In our facility as well, the wet process comes first, followed by the gas holder. The blower in our coke ovens has no impact on the system!
Reply to 3# Awakening: So what is the air delivery capacity of your coke oven gas compressor? The gas tank is located behind the fan; is it a dry-type gas tank? Under normal circumstances, turning on the fan does not affect the operation of coking
The maximum capacity of the compressor is 28,000 cubic feet, and the gas holder is of the water-sealed type.
Reply to 5# Wake Up: If it’s a wet-type gas holder, then what’s the need for a fan in front of the gas holder? There should be no great need for it; increasing the pressure with the chemical processing fan should be sufficient to meet the requirements.
Reply to 6# sqh-02696: The gas pipeline leading to methanol is a bit longer; the parameters were not set correctly at the start of coking. Furthermore, there is a fan before wet flue gas desulfurization
Generally, one set of wet flue gas desulfurization is sufficient to meet the requirements. Tangshan Zhongrun has two sets of such equipment, and rotary blowers are also used; you can go and take a look. Generally, wet flue gas desulfurization is carried out before the gas holder.
No problem; we’ve seen many factories set it up this way.