Combined production of acid from sulfur and hydrogen sulfide
Thread Content
For 250,000 tons of sulfuric acid, 200,000 tons are produced using sulfur while 50,000 tons are produced using hydrogen sulfide – which process route is better for a dry-process approach? Do two furnaces or one furnace burn?
Nanhua uses two furnaces for acid production via the dry process.
It should be divided into two systems, with hydrogen sulfide being burned and purified before mixing. After combustion, sulfur goes directly into the conversion process, whereas after the combustion of hydrogen sulfide, water is generated and must be cooled and dehydrated. If dehydration is not carried out, a dry-process system must be installed, which involves high investment costs
Of course, the dry process is better for producing sulfuric acid from sulfur; hydrogen sulfide can be used to set up a separate wet-process acid production facility
In China, there are a few plants that use a two-end-one-end design: after hydrogen sulfide is burned, purified, and dried, it is fed into the sulfur combustion furnace used for sulfuric acid production.
Mainly, the volume of exhaust gas is too large; it is intended to be used directly as combustion air to burn together with sulfur.
Dry method: If burning the acidic gas hydrogen sulfide can consume the waste gases, it is better to use a separate incinerator for sulfur, as this allows for greater heat recovery; the process gases resulting from the combustion of acidic gases are purified before being combined； If the hydrogen sulfide incinerator cannot handle all the exhaust gas, then the combustion air used to burn sulfur will also need to absorb this excess exhaust gas. It is better to use a single furnace; a single incineration system requires less investment and occupies less space. A wet process is used: one furnace is employed. Overall, it still depends on the amount of acidic feed gas and the process used to determine it.
Sulfur is sent directly to the conversion system after combustion, at a temperature of 400 degrees； If cooling to below 50 degrees is required after mixing, a larger electrostatic demister would be necessary, which is not cost-effective; you can compare the options in detail
What I mean, of course, is not the process gas resulting from sulfur combustion being integrated into the purification process for hydrogen sulfide combustion gas before that step.