Fengxi Ocean Sulfur Recovery

This post was last edited by adsl121 on 2009-11-21 22:19. Fengxi people are so awesome. They are engaged in production and scientific research at the same time. This process technology should be the sulfur recovery device from Shenmu Chemical.

Brief introduction to the selective oxidation sulfur recovery process of low sulfuric acid gas in coal chemical industry. The lower limit of hydrogen sulfide concentration of acid gas processed by the conventional improved Claus sulfur recovery process is ~25%. However, the sulfur content of acid gas in my country's coal chemical industry is relatively low (≤15%), and the concentration fluctuates greatly (5-20%). These two characteristics cause the main reaction section of the existing coal chemical acid gas Claus sulfur recovery device - the combustion furnace to not operate normally, or have to consume a large amount of The precious gas maintains normal furnace temperature, and many sulfur recovery devices are forced to idle. The exhaust gas of the sulfur recovery devices in the coal chemical industry in service exceeds the standard. This phenomenon has occurred frequently in the coal chemical industry. Facts have shown that the Claus sulfur recovery process is not suitable for my country's coal chemical industry. In order to avoid the recurrence of such accidents, our company successfully selected the sulfur oxide recovery process and catalyst for new development and application, and applied for a patent. The patent number is 200810157750.4. Its characteristics are briefly described as follows: Process principle H2S+0.5O2==S+H2O Process characteristics 1. Adapt to changes in hydrogen sulfide concentration. There is no lower limit concentration requirement. The upper limit is ≤15% based on the heat transfer characteristics of the reactor. If the hydrogen sulfide concentration exceeds 15%, it can be diluted to less than 15% depending on the gas volume and device scale. 2. The total sulfur yield is high (≥99.8%), and the tail gas emissions meet the standard (SO2<300mg/Nm3). 3. It saves investment and operating costs, eliminates the burner and incinerator, and requires no external energy supply. Specifically, our company can provide a software package that uses the water-cooled reactor of Linda Company, a well-known reactor manufacturer with patented intellectual property rights, and our company's proprietary catalyst, with detailed design provided by a design institute with professional experience in sulfur recovery. The design objectives ensure that the exhaust gas emitted from the sulfur recovery device of this project meets * * The latest comprehensive emission standards for pollutants. 1) Exhaust gas emission requirements: SO2 content: <400mg/Nm3 NOx: 0mg/Nm3 2) Sulfur recovery rate: ≥99.8%. 3) Sulfur products: The quality complies with the indicators of first-class products in the "Industrial Sulfur Standard" (GB2449-2006). Design scale device (single set) normal processing capacity: Acid gas volume 1500~20000Nm3/h production load range: 30~110% The acid gas in the process is H2S:25% as an example.: Acid gas (H2S: 25%) → Air mixing preheating (130~150℃) (H2S: ~15%) → Selective oxidation reactor (≤260℃) → Deep oxidation reactor (≤250℃) - tail gas qualified chimney emission. The flow chart is as follows: The acid gas entering the device is first pressurized by the blower and then passes through the acid gas separator. Then, it is mixed with the air from the air blower and enters the mixed gas preheater to be heated to above 130°C. It then enters the first oxidation reactor in two ways (the air flow is adjusted by The acid gas concentration and flow rate are measured to obtain the H2S absolute index, which is controlled by the computer control module). The gas entering the reactor reacts through the catalyst bed. The reaction heat is removed from the water cooling tube in the catalyst, and medium-pressure steam is produced in the steam drum. The reacted gas enters the mixed gas preheater at about 250°C, is cooled to about 160°C, and then enters the sulfur condenser. The high-temperature gas generates low-pressure steam on the condenser shell side and goes to the pipe network (the condensation temperature is controlled by controlling the low-pressure steam pressure, that is, In order to condense the sulfur in the outlet gas without lowering the freezing point of the sulfur and causing sulfur blockage), the acidic gas from the outlet sulfur condenser directly enters the sulfur mist separator. The sulfur mist entrained in the gas is separated in the defoaming net and enters the sulfur solidification device. After separation, excess air is added to the gas, and then it is preheated to 200°C through a preheater, and then enters the second oxidation reactor for deep oxidation reaction. After the reaction gas recovers heat through the preheater and sulfur condenser, it directly enters the sulfur mist separator. The sulfur mist entrained in the gas is separated in the defoaming net and enters the sulfur solidification device. The purified gas (SO2＜300mg/Nm3) passes through the activated carbon tank to absorb sulfur powder and then is vented. Main equipment and catalyst configuration 1, first oxidation reactor: Water-cooled reactor 2, second oxidation reactor: Deep oxidation reactor process index sulfur yield＞99.8% ； Total sulfur in exhaust gas＜300mg/m3 ； The operating life of the catalyst is 3 years (the catalyst in the current operating device has been normal for 5 consecutive years, and there is still no downward trend in activity) Patented technology description: Selective oxidation sulfur production catalyst description Our company's HS-35 selective sulfur oxidation recovery catalyst can be used alone or for Claus unit exhaust gas treatment ； The concentration of hydrogen sulfide processed varies by reactor. The adiabatic reactor can process H2S ≤ 2.5% acid gas, the water-cooled reactor can process H2S ≤ 25.0% acid gas, and the internal cooling reactor can process H2S ≤ 7.0% acid gas. ； The activation temperature is ≥130℃. The catalyst and process for selective sulfur recovery from low-sulphur gas sulfur recovery were obtained in 2008. * * Invention patent (No. 200810157750.4). Features of HS-35 selective sulfur oxidation recovery catalyst: 1. It has good low-temperature activity and can be used industrially at 130℃. 2. High selectivity (≥99%), excessive oxygen does not generate SO2 at 130~240℃. 3. High sulfur yield, hot spot control ≤250℃, total sulfur yield ≥99.8%. 4. The operation is simple, the catalyst does not need pretreatment and is not sensitive to oxygen. 5. The applicable sulfur content range is wide to 25% (different types of reactors can be selected), the acid gas volume is 20 to 150% more elastic, and the exhaust gas can meet the emission standards without the need for an incinerator. 6. The exhaust gas index sulfur content is far better than * * Current standards. 7. The investment of the entire device is low, only 1/4 of the Claus device.