JPS60259941A - Measurement for concentration of suspension - Google Patents

Abstract

PURPOSE:To continuously measure the concentration of solid components in an aqueous solution or a slurry liquid containing a high concentration of suspension by passing the aqueous solution containing the suspension continuously through a passage cell to measure the electric conductivity thereof continuously. CONSTITUTION:In an absorbing liquid of a lime process wet type exhaust gas desulfurizer, changes in the concentration of solid components during the circulation thereof are detected to perform a process control. A part of the absorbing liquid is introduced into a passage type cell 3 through a valve 1 and a pump 2 and passed between platinum electrodes 4 arranged in parallel to measure the specific resistance (electric conductivity) of the absorbing liquid with a vibration capacity potential difference meter 6. An ultrasonic wave generation terminal is provided at a cell inlet 7 and gives the absorbing liquid an ultrasonic wave to agitate. This helps uniform dispersion of slurry to reduce the scatter in the measured value of the electric conductivity even when the passage rate of the absorbing liquid is relatively slow. Thus, the concentration of a suspension can be measured continuously even in the case of the suspension with a high concentration.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for continuously measuring the solid content concentration in an aqueous solution or slurry containing a high concentration of solids.

[Conventional technology]

In chemical plants, environmental equipment, etc., it is sometimes necessary to handle aqueous solutions and slurry liquids containing highly concentrated suspended substances, and to measure their concentrations and perform process control. Conventionally, in such cases, the process was controlled by manually analyzing the individual components in the water and solid content. Optical methods were also used as a continuous measurement method for suspensions and suspensions, measuring the transmittance of transmitted light.

[Problem that the invention seeks to solve]

However, in the method of manually analyzing individual components in water and solids in process control, it takes a long time for one analysis, making it difficult to respond quickly and with high precision.
Furthermore, it was difficult to measure continuously. The method of determining the concentration by measuring the transmittance of light is difficult to apply when the concentration of suspended matter is high because no light is transmitted.

[Failure to solve the problem]

Specifically, the present invention provides a method for measuring the concentration of a suspension, which is characterized by continuously passing an aqueous solution containing the suspension through a flow cell and continuously measuring its electrical conductivity. .

In the present invention, a suspension is introduced into a flow-type sample cell.

The degree of a is increased by continuously measuring the electrical conductivity of the flowing suspension using electrodes appropriately installed inside the suspension.

[For production]

In this case, the specific resistance value of the suspension 1 The dispersion state and the concentration of the electrolyte in the solution will affect the measured value, but if the measurement system is constant, the specific resistance value of the suspension and the electrolyte concentration in the solution will affect the measured value. Since the concentration can be considered to be approximately constant, its influence can be corrected. The dispersion state of the solid suspension can be kept approximately constant by flowing it through the cell.If the particle size of the solid content is relatively large and the flow rate is slow, and uniform dispersion is difficult,
Further, by stirring by passing ultrasonic waves or the like, sedimentation can be prevented and the mixture can be kept homogeneous.

〔Example〕

Next, the effects of the present invention will be explained in more detail with reference to Examples. The absorption liquid of the lime method flue gas desulfurization equipment detects changes in solid content concentration during circulation.

Although the process is controlled, Ca in the slurry liquid,
, Soa, Co3, etc. were determined by manual analysis. As shown in FIG. 1, a part of this absorption liquid was introduced into a flow cell 3 through a valve 1 and a pump 2, and passed between platinum electrodes 4 installed in parallel.

The specific resistance (electrical conduction resistance) of the absorption liquid was measured using a vibrating capacitance potentiometer 6. The results are shown in FIG. In the above embodiment, an ultrasonic generation terminal is provided in the cell-entering lower part,
By applying ultrasonic waves of 19.5 RHZ'l or 27.5 RHZ and 300 W to the absorption liquid and stirring it, it helps uniform dispersion of the slurry, and even when the flow rate of the absorption liquid is relatively slow, the measured value of electrical conductivity can be improved. We were able to reduce the variation in

〔Effect of the invention〕

The present invention makes it possible to continuously measure the concentration of suspended matter even in the case of highly concentrated suspensions that do not allow any light to pass through, making it possible to automatically manage absorbing liquid and control the process with high precision. became.

[Brief explanation of drawings]

FIG. 1 is an illustration of an embodiment of the present invention, and FIG. 2 is a graph showing the relationship between the solid content concentration of the absorbent and the electrical conductivity of the absorbent according to the present invention. 1. Valve, 2. Pump, 3. Flow cell. 4... Platinum electrode, 5... Electrode support, 6... Vibration capacity xi, 7 - Cell inlet, 8 - Cell outlet. Figure 1↓

Claims (1)

[Claims] A method for measuring the concentration of a suspension, characterized by continuously passing an aqueous solution containing the suspension through a flow cell and continuously measuring its electrical conductivity.