Discussion on how sulfur-containing fuel gas can save energy
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The temperature of the sulfur exhaust furnace is entirely supplemented by fuel gas; how can fuel gas be saved while ensuring the furnace temperature remains stable? ? Are the two methods of increasing the temperature of the air flow entering the furnace through preheating, or preheating the fuel gas, feasible?
Directing the flash vapor, namely the light hydrocarbons, from the acid water stripping and solvent regeneration units to the incinerator can save fuel gas
The consumption of fuel gas in the sulfur recovery unit is the main source of energy consumption in this facility, and how to reduce its usage is a matter of concern for many people. Typically, the oxygen content in the flue gas after the furnace is kept at around 2%, which allows the fuel gas to burn fully while ensuring that the temperature of the incinerator does not drop. Preheating the air will certainly raise the temperature of the incinerator and appropriately reduce the amount of fuel gas required, but the problem is that air preheating also consumes energy.
It is technically feasible; however, unless process requirements dictate it, the method of preheating before combustion is not used, as preheating consumes steam and represents an energy cost.
Generally, sulfur plants are combined units with acidic water stripping and amine solution regeneration; is it possible to utilize the waste heat from the purified water and the lean liquid to preheat the fuel gas or air?
Although sulfur recovery, acidic water stripping, and amine solution regeneration are part of a combined facility, there is still a gap between them; it may be feasible in theory, but it is difficult to implement in practice.
The method suggested by the original poster can reduce the fuel gas consumption of the exhaust gas furnace, but as several people above have said, heating also requires a heat source; if a high-quality heat source such as steam is used, it’s better to burn more fuel gas. In terms of operation, the best way to save fuel gas is to control the oxygen content in the furnace. Minimize the oxygen content behind the furnace as much as possible, while ensuring safe and stable operation
I think precise operation and ensuring stable production are the greatest forms of savings. :)
Improving the process flow based on your analysis is a waste. There are not many control points for sulfur handling, and smooth operation essentially means just getting by