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Changsha Sanlian Measurement and Control Technology Co., Ltd
Application of DMF online concentration meter in dry recovery tower
Date: 2021-11-01Read: 24
Dimethylformamide (DMF) is a widely used chemical raw material and an excellent solvent with a wide range of applications. In PU leather production, it is mainly used to dissolve resin and dilute slurry. DMF requires low moisture content, generally above 99.9%. The quality and purity of DMF can be quickly detected by refractive index method, which has the characteristics of fast, convenient, and high accuracy.
During the dry production process of PU leather, the coating machine production line oven generates high-temperature DMF waste gas. By utilizing the strong absorption capacity of water for harmful or valuable components DMF in the waste gas, the waste gas is purified to meet emission standards, and valuable DMF is recovered. After distillation and purification, it is recycled for use, achieving both purification and recovery purposes.
The triple measurement and control MS-SH-DMF solution online concentration meter is an online concentration measurement instrument developed based on the principle of refraction. It can be installed on pipes or tank walls of different diameters for real-time concentration monitoring and control. It can directly display mass percentage concentration or user-defined units. Compared with manual detection and analysis, the measurement is faster, more accurate, and the results are clearer. It can also automatically compensate for temperature. The concentration data can be displayed on site and transmitted to PLC/DCS/frequency converter for concentration monitoring and control through analog signals (4-20mA) or communication signals (RS485). Change the extensive production management method that has relied on manual measurement, manual recording, and manual control for a long time. Visualization, intelligence, real-time concentration display, convenient for establishing databases, providing convenience for historical data queries and problem analysis.
The above figure shows a typical dry production line DMF waste gas spray recovery device. The working principle of this dry recovery tower equipment is based on the characteristic that DMF is easily soluble in water. The recovery equipment uses water spray to fully absorb and recover the waste gas containing DMF discharged from the dry production line oven, thereby achieving the purification of DMF waste gas that meets the emission standards.
The MS-SH-DMF solution online concentration meter probe is installed on the external circulation pipeline of the dry recovery tower circulation pump to detect the concentration of DMF wastewater in real time. It can control the discharge valve switch based on the 4-20mA analog signal or RS485 communication signal of the online concentration meter, continuously closed-loop detection and control, to ensure the stability and accuracy of the DMF solution concentration value, and to avoid the ability of high concentration internal circulation DMF wastewater to exchange and dilute with exhaust gas during the absorption process, which may result in insufficient absorption of DMF in the exhaust gas and discharge outside the tower, causing environmental accidents and DMF waste. By implementing 24-hour continuous measurement and control, the labor intensity of operators can be reduced and manual labor can be minimized; Improve wastewater discharge concentration and reduce recycling costs.