河北衡水枣强玻璃钢工业园 Address: Zaoqiang FRP Industrial Park, Hengshui , Hebei
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Four factors affecting the efficiency of the desulfurization tower
The main factors affecting the desulfurization efficiency of the desulfurization tower include analysis of generator power, oxidizing air, absorption tower liquid level, slurry pH value, flue gas temperature, and nozzle verticality, etc. It is recommended to improve the cutting of the slurry pool and increase the internal components of the tower. Measures such as gas-liquid mass transfer further improve the desulfurization efficiency.
Four factors affecting the efficiency of FRP desulfurization tower:
In general, the main factors affecting the desulfurization efficiency of Dongxing desulfurization tower: analysis of generator power, oxidizing air, absorption tower liquid level, slurry pH value, flue gas temperature, and nozzle verticality, etc. It is recommended to improve the slurry tank cutting bubble Measures such as increasing internal components of the tower to improve gas-liquid mass transfer will further improve desulfurization efficiency.
1. The process flow of the original desulfurization tower device is as follows: the flue gas after the boiler induced draft fan is cooled by the heat exchanger and then enters the downflow tower for pre-desulfurization, and then enters the counterflow tower through the U neck to continue desulfurization and purification, and the FGD outlet flue gas is heated by the heat exchanger It is then sent to the chimney through a booster fan for discharge; when the desulfurization tower is shut down or an accident occurs, the inlet baffle of the FGD device is closed, and the flue gas is discharged from the bypass flue to the chimney; the bypass flue is not provided with a shut-off door, and the flue gas volume The size is adjusted by the opening of the guide vane of the booster fan; 4 sets of slurry pumps for each desulfurization tower are designed, and the spray is controlled by the mother. One oxidation fan is designed. The height of the outlet of the oxidation nozzle in the tower is about 300mm from the bottom of the tower, and the nozzle diameter is DN15. The number of layout is large. The inlet slurry tank of the circulating pump is a bubble cutting pool. The bubble cutting pool and the oxidation pool are separated by a partition wall. The height of the wall is 3000mm; the foaming tank can be reached only when the slurry in the oxidation pond exceeds 3000mm; the operating liquid level of the absorption tower is adjusted to 5700mm; part of the gypsum slurry generated by the reaction is generated by the dewatering system and part of the slurry is discharged directly through the threshing system.
2. Desulfurization tower technology was adapted to high-sulfur coal types. The desulfurization device of the power plant was transformed from 2008 to 2009. The heater in the FGD inlet and outlet flue was eliminated, and the slurry circulation volume was increased from the original 22500m3 / h to 42500m3 / h. The liquid-vapor ratio was increased from 20.4 to 35.4, the operating level of the slurry tank of the desulfurization tower was still 5700mm, and the volume of the slurry tank was increased from 799 m3 to 1,325㎏m3. The slurry circulation time was shortened from 2.13min to 1.87min. The gypsum residence time in the slurry tank of the desulfurization tower increased from 10.133h to 12.44h. The flue gas volume increased from 1087200Nm3 / h to 1200000Nm3 / h, the flue gas temperature increased from the original 142 ° C to 152 ° C, and the flow velocity of the flue gas in the downstream tower was reduced from the original design of 14.1m / s to 9.69m / s. . The Ug velocity of the downstream tower was maintained at 7.96m / s. The countercurrent tower empty tower flue gas velocity was reduced from 4.66m / s to 3.91m / s. The Ug velocity of the countercurrent tower was maintained at 3.81 m / s. The flue gas temperature at the outlet of the desulfurization tower was increased from 48.9 ° C to 53 ° C. On the basis of the original 4 sets of 7500m3 / h each, the slurry circulation pump will be added with 2 sets of 10000m3 / h each, and the original oxidation fan will be added with an 30,000Nm3 / h oxidation fan. A new set of belt dehydrator is added to the dewatering system. After the expansion of the desulfurization tower, the slurry is removed from the absorption tower by using half dehydration and half throwing.
3. The operating parameters of the desulfurization tower after the transformation to provide reliable data support to further improve the desulfurization efficiency. The commissioning unit collected the operating parameters and trends of the desulfurization tower over a period of time and conducted some corresponding tests.
4 Analysis of influencing factors From the table drawn from the historical data of the impact of the above oxidation fan on the circulation pump current running trend and other factors on the desulfurization efficiency of the desulfurization tower, the oxidizing air is the main cause of the large fluctuation range of the circulation pump current. the reason. The density of the slurry, the liquid level of the absorption tower, the pH value of the absorption tower slurry, the load, and the sulfur content of the coal all have a large effect on the desulfurization efficiency. However, the factors affecting the desulfurization efficiency of the desulfurization tower are not limited to the above-mentioned factors, but also include the verticality of the slurry nozzle, the slurry spray height, the slurry nozzle spacing, the coverage ratio, the flue gas temperature, the flue gas flow rate, and the circulation pump output.