CN116297737A - A desulfurization slurry pH online measurement system - Google Patents

Abstract

The invention discloses a desulfurization slurry pH on-line measurement system, wherein an inner cylinder is arranged in a desulfurization slurry buffer tank, desulfurization slurry directly enters the inner cylinder of the desulfurization slurry buffer tank through a slurry inlet valve, part of slurry enters a pH measurement flow cell through an inner cylinder outlet pipe, and the pH of the slurry is measured through a pH composite electrode; part of the slurry overflows from the upper part of the inner cylinder, flows out along the inner wall of the desulfurization slurry buffer tank and is discharged through a blow-down valve of the desulfurization slurry buffer tank. Through setting up desulfurization thick liquid buffer tank and inner tube, can cushion desulfurization thick liquid, make the thick liquid that enters into the pH measurement flow cell can not cause serious scour and wear to the pH composite electrode. And the bottom baffle of the pH measuring flow cell of the measuring flow cell is positioned under the pH composite electrode, so that slurry is prevented from directly impacting the sensor, and the service life of the sensor is prolonged. The online measurement system for the pH of the desulfurization slurry can effectively avoid the erosion and abrasion of the desulfurization slurry to the pH electrode and prolong the service life of the sensor.

Description

A desulfurization slurry pH online measurement system

technical field

The invention belongs to the technical field of power generation and relates to an on-line pH measurement system for desulfurization slurry.

Background technique

At present, the limestone-gypsum wet desulfurization process is the most widely used desulfurization technology. In order to ensure the safe and reliable operation of the entire desulfurization system, a large number of instruments are needed to detect various parameters of the system. The absorption tower is the core equipment of the wet desulfurization process. The pH value of the desulfurization slurry in the tower is one of the most important monitoring indicators. Through accurate monitoring of the pH value of the slurry, the concentration of the limestone slurry sent to the desulfurization tower and the amount of slurry discharge are strictly controlled. , to ensure the desulfurization efficiency of the desulfurization tower, reduce the consumption of limestone, and ensure the safe and economical operation of the desulfurization system.

At present, the pH value of the desulfurization slurry in power plants is monitored online through an online pH meter. Most power plant pH measurement methods are to directly insert the pH electrode into the slurry measurement pipeline for measurement, but this measurement method has the following problems: the desulfurization slurry contains a large amount of Limestone particles and other solid impurities, and the slurry flow rate during the measurement process is very high, the erosion and wear of the electrode is very serious, the pH electrode generally needs to be replaced every 3 to 6 months, and the service life is short. Therefore, constructing an online pH measurement system for desulfurization slurry and changing the traditional pH measurement method can effectively solve the above problems.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide an on-line measurement system for pH of desulfurization slurry, which can realize online measurement of pH of desulfurization slurry and prolong the service life of pH electrodes.

In order to achieve the above purpose, the desulfurization slurry pH online measurement system of the present invention includes a slurry inlet pipeline, a desulfurization slurry inlet valve, a desulfurization slurry buffer tank, a desulfurization slurry buffer tank inner cylinder, a desulfurization slurry buffer tank inner cylinder drain valve, and a desulfurization slurry buffer tank. Tank drain valve, flushing water inlet valve and pH measurement flow cell;

The inner cylinder of the desulfurization slurry buffer tank is placed inside the desulfurization slurry buffer tank; the slurry inlet pipe is connected to the inlet of the desulfurization slurry buffer tank inner cylinder through the slurry inlet valve, and the outlet of the desulfurization slurry buffer tank inner cylinder is connected to the water inlet at the bottom of the pH measurement flow pool The flushing water inlet pipeline is connected with the outlet of the inner cylinder of the desulfurization slurry buffer tank and the water inlet at the bottom of the pH measurement flow cell through the flushing water inlet valve; the pH measurement flow cell is equipped with a pH composite electrode, and the inner cylinder of the desulfurization slurry buffer tank is discharged The valve is set at the bottom outlet of the inner cylinder of the desulfurization slurry buffer tank, and the blowdown valve of the desulfurization slurry buffer tank is set at the bottom outlet of the desulfurization slurry buffer tank;

The pH measurement flow cell is provided with a bottom partition of the pH measurement flow cell, and the bottom partition of the pH measurement flow cell is located directly below the pH composite electrode;

The desulfurization slurry inlet valve, desulfurization slurry buffer tank inner barrel drain valve, desulfurization slurry buffer tank drain valve, flushing water inlet valve control end are connected to the control and display control end; the pH compound electrode signal output end is connected to the control and display signal input end connect;

The desulfurization slurry inlet valve, the desulfurization slurry buffer tank inner cylinder drain valve, the desulfurization slurry buffer tank drain valve, and the flushing water inlet valve are all electric valves. The valve switch can be switched by the control and display according to the set control program, and can be switched manually;

The system is equipped with an automatic cleaning program, and the control and display control the running process and cleaning process alternately according to the set program, and manual operation can also control the running process and cleaning process alternately;

The present invention has the following beneficial effects:

During the specific operation of the desulfurization slurry pH online measurement system of the present invention, an inner cylinder is arranged in the desulfurization slurry buffer tank, and the desulfurization slurry directly enters the inner cylinder of the desulfurization slurry buffer tank through the slurry inlet valve, and part of the slurry enters into the desulfurization slurry buffer tank through the outlet pipe of the inner cylinder. The pH measurement flow cell measures the pH of the slurry through the pH composite electrode; part of the slurry overflows from the upper part of the inner cylinder, flows out along the inner wall of the desulfurization slurry buffer tank, and is discharged through the drain valve of the desulfurization slurry buffer tank. By setting the desulfurization slurry buffer tank and the inner cylinder, the desulfurization slurry can be buffered, so that the slurry entering the pH measurement flow cell will not cause serious erosion and wear to the pH composite electrode. Further, the bottom partition of the pH measuring flow cell is located directly below the pH composite electrode, which prevents the slurry from directly impacting the sensor and prolongs the service life of the sensor.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Among them, 1 is the desulfurization slurry inlet valve, 2 is the desulfurization slurry buffer tank, 3 is the inner cylinder of the desulfurization slurry buffer tank, 4 is the drain valve of the inner cylinder of the desulfurization slurry buffer tank, 5 is the drain valve of the desulfurization slurry buffer tank, and 6 is the flushing water inlet Valve, 7 is the bottom partition of the pH measurement flow cell, 8 is the pH composite electrode, 9 is the pH measurement flow cell, 10 is the control and display;

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only The embodiments are a part of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts disclosed in the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

The schematic diagrams of the structures according to the disclosed embodiments of the present invention are shown in the accompanying drawings. The figures are not drawn to scale, with certain details exaggerated and possibly omitted for clarity of presentation. The shapes of various regions and layers shown in the figure and their relative sizes and positional relationships are only exemplary, and may deviate due to manufacturing tolerances or technical limitations in practice, and those skilled in the art may Regions/layers with different shapes, sizes, and relative positions can be additionally designed as needed.

Referring to Fig. 1, the desulfurization slurry pH online measurement system of the present invention includes a slurry inlet pipeline, a desulfurization slurry inlet valve 1, a desulfurization slurry buffer tank 2, a desulfurization slurry buffer tank inner cylinder 3, a desulfurization slurry buffer tank inner cylinder drain valve 4, Desulfurization slurry buffer tank drain valve 5, flushing water inlet valve 6, pH measurement flow cell bottom partition 7, pH composite electrode 8, pH measurement flow cell 9, control and display 10;

The inner cylinder 3 of the desulfurization slurry buffer tank is placed inside the desulfurization slurry buffer tank 2; the slurry inlet pipe is connected to the inlet of the desulfurization slurry buffer tank inner cylinder 3 through the slurry inlet valve 1, and the outlet of the desulfurization slurry buffer tank inner cylinder 3 is connected to the pH measurement flow pool 9 The bottom water inlet is connected; the flushing water inlet pipeline is connected with the outlet of the desulfurization slurry buffer tank inner cylinder 3 and the bottom water inlet of the pH measuring flow cell 9 through the flushing water inlet valve 6; the pH measuring flow cell 9 is provided with a pH composite electrode 8;

The pH measurement flow cell 9 is provided with a bottom partition 7 of the pH measurement flow cell, and the bottom partition of the pH measurement flow cell is located directly below the pH composite electrode 8;

The desulfurization slurry inlet valve 1, the desulfurization slurry buffer tank inner cylinder drain valve 4, the desulfurization slurry buffer tank drain valve 5, the flushing water inlet valve 6, the control terminal is connected to the control terminal and the display 10 control terminal; the signal output terminal of the pH compound electrode 8 is connected to the control terminal and display 10 signal input terminals are connected;

The desulfurization slurry inlet valve 1, the desulfurization slurry buffer tank inner cylinder drain valve 4, the desulfurization slurry buffer tank drain valve 5, and the flushing water inlet valve 6 are all electric valves. switch;

The system is provided with an automatic cleaning program, and the control and display 10 controls the running process and the cleaning process to be carried out alternately according to the set program, and manual operation can also control the running process and the cleaning process to be carried out alternately.

Concrete work process of the present invention is:

During the specific operation of the desulfurization slurry pH online measurement system of the present invention, an inner cylinder is arranged in the desulfurization slurry buffer tank. When the system is running, the desulfurization slurry inlet valve 1 is opened, the desulfurization slurry buffer tank drain valve 5 is opened, and the desulfurization slurry buffer tank The inner cylinder sewage valve 4 is closed, the flushing water inlet valve 6 is closed, the desulfurization slurry enters the desulfurization slurry buffer tank inner cylinder 3 directly through the slurry inlet valve 1, and part of the slurry enters the pH measurement flow cell 7 through the inner cylinder outlet pipe, and passes through the pH composite electrode 8 measures the pH of the slurry, and converts the data of the pH compound electrode 8 through the control and display 10 to realize online measurement of the pH value of the water sample; part of the slurry overflows from the upper part of the inner cylinder 3 and flows out along the inner wall of the desulfurization slurry buffer tank 2 , to be discharged through the blowdown valve 5 of the desulfurization slurry buffer tank. By setting the desulfurization slurry buffer tank 2 and the inner cylinder 3, the desulfurization slurry can be buffered, so that the slurry entering the pH measurement flow cell 9 will not cause severe erosion and wear to the pH composite electrode 8.

The system is equipped with an automatic cleaning program. The running time and flushing time are set through the control and display 10. When the preset flushing time is reached, the desulfurization slurry inlet valve 1 is closed, and the flushing water inlet valve 6 and the inner cylinder of the desulfurization slurry buffer tank are discharged. Valve 4 and desulfurization slurry buffer tank drain valve 5 are fully opened to clean the desulfurization slurry buffer tank 2, desulfurization slurry buffer tank inner cylinder 3, measurement flow cell 9 and related pipelines, and automatically enter the measurement process after cleaning.

It should be noted that the bottom of the measurement flow cell 9 is provided with a water sample inlet pipeline and a bottom partition 7 of the pH measurement flow cell, wherein the outlet of the water sample inlet pipeline is located at the bottom of the measurement flow cell 9, and the bottom of the pH measurement flow cell is separated The plate is located directly below the pH composite electrode 8, which can avoid water samples directly impacting the sensor and prolong the service life of the sensor.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall fall within the protection scope of the claims of the present invention.

Claims (8)

1. A desulfurization slurry pH online measurement system, characterized in that it comprises a slurry inlet pipeline, a desulfurization slurry inlet valve (1), a desulfurization slurry buffer tank (2), a desulfurization slurry buffer tank inner cylinder (3), a desulfurization slurry buffer tank Inner cylinder blowdown valve (4), desulfurization slurry buffer tank blowdown valve (5), flushing water inlet valve (6) and pH measurement flow cell (9); The inner cylinder (3) of the desulfurization slurry buffer tank is placed inside the desulfurization slurry buffer tank (2); the slurry inlet pipe is connected to the inlet of the desulfurization slurry buffer tank inner cylinder (3) through the slurry inlet valve (1), and the desulfurization slurry buffer tank The outlet of the cylinder (3) is connected with the water inlet at the bottom of the pH measurement flow cell (9); the flushing water inlet pipe passes through the flushing water inlet valve (6) and the outlet of the desulfurization slurry buffer tank inner cylinder (3) and the pH measurement flow cell (9) The water inlet at the bottom is connected; the pH measurement flow cell (9) is provided with a pH composite electrode (8), and the desulfurization slurry buffer tank inner cylinder blowdown valve (4) is arranged on the desulfurization slurry buffer tank inner cylinder (3) Bottom outlet, the desulfurization slurry buffer tank blowdown valve (5) is arranged at the bottom outlet of the desulfurization slurry buffer tank (2). 2. The on-line pH measurement system for desulfurization slurry according to claim 1, characterized in that a bottom partition (7) of the pH measurement flow cell (9) is arranged in the pH measurement flow cell. 3. The online pH measurement system for desulfurization slurry according to claim 2, characterized in that the bottom partition of the pH measurement flow cell is located directly below the pH composite electrode (8). 4. The desulfurization slurry pH online measurement system according to claim 1, characterized in that it also includes a control and display (10), a desulfurization slurry inlet valve (1), a desulfurization slurry buffer tank inner tube blowdown valve (4), a desulfurization slurry The control end of the slurry buffer tank drain valve (5) and the flushing water inlet valve (6) are connected to the control end of the control and display (10); the signal output end of the pH composite electrode (8) is connected to the signal input of the control and display (10) end connected. 5. The desulfurization slurry pH online measurement system according to claim 1, characterized in that, the desulfurization slurry inlet valve (1), the desulfurization slurry buffer tank inner tube blowdown valve (4), the desulfurization slurry buffer tank blowdown valve (5), The flushing water inlet valve (6) is an electric valve, and the valve switch can be switched by the control and display (10) according to the set control program or manually. 6. The online pH measurement system for desulfurization slurry according to claim 1, characterized in that the system is provided with an automatic cleaning program, and the control and display (10) controls the operation process and the cleaning process alternately according to the set program. 7. The on-line pH measurement system for desulfurization slurry according to claim 1, characterized in that the manual operation control operation process and the cleaning process are carried out alternately. 8. The desulfurization slurry pH online measurement system according to claim 1, characterized in that, the desulfurization slurry directly enters the inner cylinder (3) of the desulfurization slurry buffer tank through the slurry inlet valve (1), and part of the slurry enters the desulfurization slurry buffer tank through the inner cylinder outlet pipe. In the pH measurement flow cell (9), part of the slurry overflows from the upper part of the inner cylinder (3) of the desulfurization slurry buffer tank, flows out along the inner wall of the desulfurization slurry buffer tank (2), and is discharged through the drain valve (5) of the desulfurization slurry buffer tank.

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