Flue gas wet method desulfurized gypsum slurry on-line density and pH value combined measuring device and measuring method

Abstract

The invention belongs to the field of mechanical equipment, and especially relates to a flue gas wet method desulfurized gypsum slurry on-line density and pH value combined measuring device and a measuring method. The flue gas wet method desulfurized gypsum slurry on-line density and pH value combined measuring device comprises a measuring tank, wherein the top of the measuring tank is provided with a venthole, and the bottom is provided with a slurry discharge port, and a densitometer and a pH meter are arranged on the tank body, and are designed to stretch into the tank body; a sampling pipeline connected with the measuring tank, wherein one end of the sampling pipeline is connected with the tower bottom of a flue gas wet method desulfurization tower, and the other end is designed to stretch into the tank body of the measuring tank, and the end of the sampling pipeline stretching into the tank body is provided with a spray head. In applications of the flue gas wet method desulfurizedgypsum slurry on-line density and pH value combined measuring device, the sampling pipeline is designed to stretch into the measuring tank, the liquid level in the measuring tank is controlled at a degree that the densitometer and the pH meter are immersed, so that slurry density and pH value are obtained through measuring. The flue gas wet method desulfurized gypsum slurry on-line density and pHvalue combined measuring device is capable of realizing low maintenance, continuous on-line high-accuracy measuring of gypsum slurry on-line density and pH value.

Description

technical field [0001] The invention belongs to the field of mechanical equipment, and in particular relates to a combined measuring device and method for measuring the online density and pH value of gypsum slurry by wet flue gas desulfurization. Background technique [0002] In recent years, with the serious environmental pollution, the state has issued a series of policies and encouraged thermal power plants to implement ultra-low emission transformation. After transformation, the flue gas SO 2 Emission concentration is required to be controlled at 35mg / Nm 3 Next, this puts forward stricter requirements for the safe and economical operation of the desulfurization system. At present, in the limestone-gypsum wet desulfurization system, the density and pH value of gypsum slurry are two important parameters of limestone-gypsum wet desulfurization, which play a vital role in the operation and control of the whole system. The pH value of gypsum slurry is one of the main contro...

AI Technical Summary

Problems solved by technology

The disadvantages are: the slurry flow rate at the pH electrode in the outlet pipeline is high, and the fluid erosion is easy to wear the electrode; the flushing port is facing the electrode, and the flow rate of the flushing water in the pipeline is high, which will impact and damage the electrode. In severe cases, the glass electrode will break and cannot be used. ;Gypsum particles scale around the electrode, making disassembly difficult and not convenient for regular calibration

However, the diameter of the bypass pipe is small, and there are strict requirements on the flow rate when measuring the density of the slurry. When the flow rate is low, deposits are easy to occur and block the measuring tube; Will wear through the measuring tube and result in the failure of the mass flow meter

The difference in diameter between the bypass pipe and the main pipe will cause large fluctuations in the flow rate of the slurry at the measurement point, which is difficult to control, so the mass flowmeter cannot operate stably for a long time

[0005] If the density and pH value of gypsum slurry cannot be measured reliably and accurately online, the desulfurization system will not be able to supply and discharge slurry in time. If the pH value is too low, it will cause serious corrosion of the system, reduce the service life of the equipment, and even make the desulfurization system difficult to operate economically and efficiently. safe operation

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