Device for removing COD (Chemical Oxygen Demand) in mechanical seal water of calcium-process trimethylolpropane vacuum system

The utility model relates to the field of a device for removing COD (Chemical Oxygen Demand) from mechanical seal water of a vacuum system, in particular to a device for removing COD from mechanical seal water of a calcium-process trimethylolpropane vacuum system. Comprising a mechanical seal water collecting tank, one side wall of the mechanical seal water collecting tank is communicated with a conveying pipe, the other end of the conveying pipe is communicated with a rectifying tower body, a feeding pump is installed at the joint of the mechanical seal water collecting tank and the conveying pipe, a reboiler body is arranged in the rectifying tower body, and the top of the rectifying tower body is communicated with a steam box assembly. The side wall, away from the mechanical seal water collecting tank, of the rectifying tower body is communicated with a vacuum pipe, an air pressure valve is installed at the joint of the vacuum pipe and the rectifying tower body, the other end of the vacuum pipe is communic