1、Process features
1.1The product is clear and transparent.
1.2With chemical sulfur removal, it has stable effect and no pollution.
1.3The multi safety anti backfire measures of flame arrester + check valve + cooling are used to ensure safety and completely eliminate the risk of backfire air duct.
1.4Adopting the freezing and condensing technology, there is no trouble of compressor maintenance, and no trouble of compressor oil. Low condensation pressure, completely oil-free. High degree of automation, unattended.
2、Process description
Considering the actual situation, the plant can choose different oxygen sources: air separation, PSA or direct use of air. Now take the oxygen production by air separation as an example.
2.1Sulfur melting process: put solid sulfur into the sulfur melting tank, put steam into the jacket and coil to melt sulfur into liquid, get pure liquid sulfur through clarification and purification, and store it in the liquid sulfur storage tank. Liquid sulfur can also be used directly.
2.2Sulfur burning process: liquid sulfur is added into the burner through a pump and reacts with the dry air to obtain SO2 gas. At the same time, the heat is released, which is taken out by the high-temperature gas and go into the waste heat boiler. The gas in the waste heat boiler is cooled to 240-280 ℃ and by-product steam is obtained (P=0.4-0.5MPa). SO2 gas enters the 2nd stage of cooler and cools to 140 ℃.
S + O2 = SO2 + Q
2.3Gas purification process: cooled gas enters into the sulfur removal reactor, using SO3 to remove sulfur, sulfur carried in the gas will react with SO3. The sulfur is oxidized to SO2, and the sulfur carried in the gas is removed. Pure SO2 gas is sent to condensation liquefaction process.
SO2 + O2 = SO3
S + 2SO3 = 3SO2
2.4SO2 gas enters the condenser and is refrigerated at - 20 ℃. Then, we can get liquid SO2 and send it to product storage tank.
2.5Process flow chart
3、 Quality assurance and consumption list
3.1 SO2 quality standard
3.2Consumption list
4、Treatment for “3 wastes”
4.1Waste water: no waste water generated.
4.2Waste gas
1）Source and composition of waste gas: the waste gas mainly comes from the non condensable gas of condenser and storage tank, with small amount and intermittent emission, and the pollution factor is SO2.
2）Treatment measures: exhaust gas is discharged into exhaust gas washing system, washed with liquid soda solution.
4.3Solid waste: no solid waste generated.
1.1The product is clear and transparent.
1.2With chemical sulfur removal, it has stable effect and no pollution.
1.3The multi safety anti backfire measures of flame arrester + check valve + cooling are used to ensure safety and completely eliminate the risk of backfire air duct.
1.4Adopting the freezing and condensing technology, there is no trouble of compressor maintenance, and no trouble of compressor oil. Low condensation pressure, completely oil-free. High degree of automation, unattended.
2、Process description
Considering the actual situation, the plant can choose different oxygen sources: air separation, PSA or direct use of air. Now take the oxygen production by air separation as an example.
2.1Sulfur melting process: put solid sulfur into the sulfur melting tank, put steam into the jacket and coil to melt sulfur into liquid, get pure liquid sulfur through clarification and purification, and store it in the liquid sulfur storage tank. Liquid sulfur can also be used directly.
2.2Sulfur burning process: liquid sulfur is added into the burner through a pump and reacts with the dry air to obtain SO2 gas. At the same time, the heat is released, which is taken out by the high-temperature gas and go into the waste heat boiler. The gas in the waste heat boiler is cooled to 240-280 ℃ and by-product steam is obtained (P=0.4-0.5MPa). SO2 gas enters the 2nd stage of cooler and cools to 140 ℃.
S + O2 = SO2 + Q
2.3Gas purification process: cooled gas enters into the sulfur removal reactor, using SO3 to remove sulfur, sulfur carried in the gas will react with SO3. The sulfur is oxidized to SO2, and the sulfur carried in the gas is removed. Pure SO2 gas is sent to condensation liquefaction process.
SO2 + O2 = SO3
S + 2SO3 = 3SO2
2.4SO2 gas enters the condenser and is refrigerated at - 20 ℃. Then, we can get liquid SO2 and send it to product storage tank.
2.5Process flow chart
3、 Quality assurance and consumption list
3.1 SO2 quality standard
| Item | Unit | Index(guarantee) |
| SO2 mass percentage | % | ≥99.99 |
| residue | % | ≤0.005 |
| moisture | % | ≤0.01 |
| No. | Item | Unit | consumption quota | |
| expectation | guarantee | |||
| 1 | O2 | Nm3 | 353 | 353 |
| 2 | sulfur | t | 0.503 | 0.503 |
| 3 | power | kwh | 30（exclude oxygen production by air separation） | 30（exclude oxygen production by air separation） |
| 4 | steam 0.8MPa | t | -1.6t | -1.6t |
| 5 | tap water | t | 1 | 1 |
4.1Waste water: no waste water generated.
4.2Waste gas
1）Source and composition of waste gas: the waste gas mainly comes from the non condensable gas of condenser and storage tank, with small amount and intermittent emission, and the pollution factor is SO2.
2）Treatment measures: exhaust gas is discharged into exhaust gas washing system, washed with liquid soda solution.
4.3Solid waste: no solid waste generated.
