High-temperature mixing valve
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Hey everyone, I’m not sure what the high-temperature mixing valve is used for – is it used to heat the Claus acidic gas? What heat medium is used for heating? Our process doesn’t have this thing, so I’m not quite sure!
The high-temperature blending valve is a three-way valve that supplies a portion of the high-temperature process gas from the reactor to the inlet of the converter, in order to increase the temperature of the process gas entering the converter. From a technical perspective, this will have a slight impact on the conversion rate; operating costs will be lower, but there will be issues with maintenance and temperature control, especially in large-scale installations, I think.
Increasing the temperature of the process gas entering the converter reduces the conversion rate, but this is done to keep its temperature above the dew point of sulfur, thereby preventing sulfur from depositing on the catalyst and causing blockages in the converter! Of course, there are also rear designs that do not use high-temperature mixing valves; instead, other devices such as heat exchangers are used to heat the process gas at the inlet of the converter. Ask questions! I wonder what kind of ones you guys have~~
Our process works as follows: there is a heater at the inlet of both the primary and secondary converters, which uses 3.5-bar superheated steam for heating. The temperature of the process gas generally reaches around 220 degrees. However, there is one problem – the drain valves often get clogged, and if they are not repaired, the temperature will not reach the required level!
The high-temperature mixing valve you mentioned is nothing but a three-way valve. Installed on the sulfur production furnace, it uses the high-temperature process gas inside the furnace to mix and heat the process gas entering the primary reactor. Some processes also use low-temperature blending valves, which can eliminate the need for a process gas heat exchanger. In practice, the mixing valves (for high and low temperatures) are all designed to save on initial investment. It serves as a substitute for online heating furnaces. However, the maintenance frequency is relatively high; the ones used in the past had to be replaced after a short period of time. The mixing valves in use now, thanks to modifications made to their valve cores, can last around 2-3 years if properly maintained. During normal use, it should be ensured that the temperature of the valve core does not exceed 800 degrees. The deoxygenated water used for cooling the valve spool should not be stopped once it is in use. Please participate actively. If you have any questions, feel free to contact me. zhezi2009.wang@163.com