Device for measuring pH value and density of desulfurization slurry

Abstract

The utility model belongs to the technical field of boiler flue gas desulfurization, and discloses a device for measuring the pH value and density of desulfurization slurry, the device comprises a sampling inclined pipe, an inlet valve, a pH meter, a mass flowmeter, an outlet valve, a sample discharging inclined pipe and a measuring pipeline, the upper end of the sampling inclined pipe is communicated with the side wall of an absorption tower slurry pool, and the lower end of the sample discharging inclined pipe is communicated with the side wall of the absorption tower slurry pool; the upper end of the measuring pipeline is connected with the lower end of the sampling inclined pipe, and the lower end of the measuring pipeline is connected with the upper end of the sample discharging inclined pipe; an inlet valve, a pH meter, a mass flow meter and an outlet valve are sequentially arranged on the measuring pipeline from top to bottom; and a side-entering stirrer is mounted at the lower part in the absorption tower slurry pool. The measuring pipeline is vertically arranged, so that solid particles in the slurry are not deposited; small pressure difference is generated between a low-pressure area on the back of the stirrer and an inlet, so that slurry flows at a low speed, and measured data are stable; the sample discharging inclined pipe is fixedly connected to the bottom wall plate of the absorption tower slurry pool, slurry is not discharged, and environment friendliness is achieved.

Description

Technical Field

[0001] The present application relates to a device for measuring the pH value and density of a slurry, and in particular to a device for measuring the pH value and density of a desulfurization slurry, and belongs to the technical field of boiler flue gas desulfurization. Background Art

[0002] The desulfurization of coal-fired power plants in my country generally adopts the limestone-gypsum wet method, which requires real-time monitoring of the pH value and density of the slurry. Generally, two schemes are adopted: one is to open a DN50 hole in the tower wall of the slurry pool, connect the measuring pipe, and use the pressure generated by the high liquid level in the tower to let the slurry flow to the ditch around the absorption tower, or connect the outlet of the measuring pipe to the inlet of the slurry circulation pump; the other is to connect a measuring pipe at the outlet of the slurry circulation pump, and connect the outlet of the measuring pipe to the tower, and connect the pH meter and mass flow meter to the measuring pipe.

[0003] These two solutions have the following problems:

[0004] 1. The first solution: When the slurry pool is connected to the measuring pipeline through the opening of the tower wall, and the slurry flows to the trench around the absorption tower: In order to fill the slurry pipe, there must be a section of upward pipeline. The inlet valve opening is large, the slurry flow rate is fast, resulting in unstable measurement data, wear of the pH meter and mass flowmeter, and affecting the service life; the inlet valve opening is small, and solid particles in the slurry are deposited, causing blockage. Solid particles are deposited in the slurry discharged to the trench, and need to be cleaned frequently, increasing the maintenance workload; the slurry in the trench eventually flows to the pit and is pumped into the absorption tower by the pit pump. The pit pump needs to be started frequently, increasing power consumption and shortening its service life. When the slurry pool is connected to the measuring pipeline through the opening of the tower wall, and the outlet of the measuring pipeline is connected to the inlet of the slurry circulation pump: During the actual operation, the slurry circulation pump is often switched. When the slurry circulation pump is stopped, there is no differential pressure at the inlet and outlet of the measuring pipeline, no flow in the pipe, and the measurement data is constant, which cannot reflect the pH value and density value of the slurry in the operating absorption tower in real time. It is necessary to connect multiple measuring pipelines to ensure the accuracy of the measurement data, which increases the cost.

[0005] 2. The second solution: When a measuring pipeline is connected to the outlet of the slurry circulation pump and the outlet of the measuring pipeline is reversed to the tower, the outlet pressure of the slurry circulation pump is relatively high, resulting in a large flow rate in the measuring pipeline, and the pH meter and the mass flow meter are worn. If the diameter of the mass flow meter is increased, the cost will increase. This solution is only used in early desulfurization projects and is not often used now.

[0006] The above two technical solutions both have problems such as unstable measurement data, pipeline blockage, equipment wear, etc. Therefore, it is very necessary to develop a new technical solution for measuring the pH value and density of desulfurization slurry with stable data, no wear, no blockage, and environmentally friendly. Summary of the invention

[0007] In order to solve the problems of unstable pH and density measurement data, pipeline blockage and equipment wear in desulfurization slurry measurement, the present application provides a device for measuring the pH value and density of desulfurization slurry, which has the characteristics of stable data, no wear, no blockage and environmental friendliness.

[0008] The technical solution adopted in this application:

[0009] A device for measuring the pH value and density of a desulfurized slurry comprises a sampling inclined tube, an inlet valve, a pH meter, a mass flow meter, an outlet valve, a sample row inclined tube, and a measuring pipeline, wherein the upper end of the sampling inclined tube is communicated with the side wall of a slurry pool in an absorber, and the lower end of the sample row inclined tube is communicated with the side wall of a slurry pool in an absorber; the measuring pipeline is vertically arranged, and its upper end is connected to the lower end of the sampling inclined tube, and its lower end is connected to the upper end of the sample row inclined tube; the measuring pipeline is sequentially provided with an inlet valve, a pH meter, a mass flow meter and an outlet valve from top to bottom; a side-entry agitator is installed at the lower part of the absorber slurry pool.

[0010] Preferably, the device for measuring the pH value and density of the desulfurization slurry also includes a flushing water valve and a flushing pipe. The flushing pipe is connected to the upper part of the measuring pipe, and the flushing water valve is installed on the flushing pipe.

[0011] Preferably, the measuring pipe and the flushing pipe are both made of carbon steel rubber lined pipes.

[0012] Preferably, the measuring pipe and the flushing pipe are both made of 2205 stainless steel pipes.

[0013] Preferably, the inlet valve, flushing water valve and outlet valve are all rubber-lined butterfly valves.

[0014] Compared with the prior art, this application has the following beneficial effects:

[0015] 1. The device has a simple and reliable structure and low investment and operating costs;

[0016] 2. The measuring pipeline is arranged vertically, and the solid particles in the slurry do not settle in the pipe;

[0017] 3. Use the low-pressure area on the back of the side-entry agitator at the bottom of the absorber slurry pool to generate a small pressure difference with the inlet, so that the slurry in the measuring pipe flows from top to bottom at a low speed, thereby achieving stable measurement data and less equipment wear;

[0018] 4. The sample discharge inclined tube is fixedly connected to the lower tower wall of the absorption tower slurry pool, and the slurry is not discharged, which is environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a schematic diagram of the overall structure of a device for measuring the pH value and density of desulfurization slurry.

[0020] In the figure: 1. Inlet sampling inclined tube, 2. Inlet valve, 3. Flushing water valve, 4. pH meter, 5. Mass flow meter, 6. Outlet valve, 7. Sampling inclined tube, 8. Side-entry agitator, 9. Absorption tower slurry pool, 10. Measuring pipeline, 11. Flushing pipeline. DETAILED DESCRIPTION

[0021] The present application will be described in detail below in conjunction with the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of the structure and technical common knowledge is omitted to avoid unnecessary confusion of the concept of the present application.

[0022] Combined with Figure 1 The device for measuring the pH value and density of desulfurization slurry described in the present application comprises a sampling inclined tube 1, an inlet valve 2, a pH meter 4, a mass flow meter 5, an outlet valve 6, a sample row inclined tube 7, and a measuring pipeline 10. The upper end of the sampling inclined tube 1 is connected to the side wall of the absorption tower slurry pool 9, and the lower end of the sample row inclined tube 7 is connected to the side wall of the absorption tower slurry pool 9; the measuring pipeline 10 is vertically arranged, and its upper end is connected to the lower end of the sampling inclined tube 1, and its lower end is connected to the upper end of the sample row inclined tube 7; the measuring pipeline 10 is sequentially provided with an inlet valve 2, a pH meter 4, a mass flow meter 5 and an outlet valve 6 from top to bottom; a side-entry agitator 8 is installed at the lower part of the absorption tower slurry pool 9.

[0023] In this embodiment, a flushing water valve 3 and a flushing pipe 11 are provided. The flushing pipe 11 is connected to the upper portion of the measuring pipe 10 , and the flushing water valve 3 is installed on the flushing pipe 11 .

[0024] In this embodiment, the measuring pipe 10 and the flushing pipe 11 are both made of carbon steel rubber lined pipes.

[0025] In this embodiment, the measuring pipe 10 and the flushing pipe 11 are both made of 2205 stainless steel pipes.

[0026] In this embodiment, the inlet valve 2, the flushing water valve 3, and the outlet valve 6 are all rubber-lined butterfly valves.

[0027] Working principle and process:

[0028] The structure of the present application is simple and reliable. The measuring pipeline is arranged vertically. A small pressure difference is generated between the low-pressure area on the back of the side-entry agitator at the bottom of the slurry pool of the absorption tower and the inlet, so that the slurry in the measuring pipeline flows from top to bottom at a low speed, thereby achieving stable measurement data, and solid particles in the slurry are not deposited in the pipe, there is no blockage, and the equipment wear is small; the lower end of the sample discharge inclined tube is connected to the lower part of the side wall of the slurry pool of the absorption tower, and the slurry is not discharged externally, and there is no slurry solid deposition in the corresponding ditch, thereby achieving environmental friendliness of the measuring pipeline; it does not increase the workload of operation and maintenance; it does not increase the burden on the pit pump, reduces power consumption, and extends the service life of the pit pump.

[0029] In order to prevent the solid particles in the absorption tower slurry pool from depositing in the tower, the side-entry agitator is powered by a security power supply, which ensures stable operation without the risk of switching operation or power failure.

[0030] The above description is only an illustrative description of the principle and efficacy of the present application, and is not intended to limit the present application. Any technical idea disclosed in the present application, and any simple replacement or change based on the technical solution of the present application, shall be within the protection scope of the present application.

Claims

1. A device for measuring the pH value and density of desulfurization slurry, characterized in that: The invention comprises a sampling inclined tube (1), an inlet valve (2), a pH meter (4), a mass flow meter (5), an outlet valve (6), a sample row inclined tube (7), and a measuring pipeline (10); the upper end of the sampling inclined tube (1) is in communication with the side wall of a slurry pool (9) of an absorption tower, and the lower end of the sample row inclined tube (7) is in communication with the side wall of a slurry pool (9) of an absorption tower; the measuring pipeline (10) is arranged vertically, and its upper end is connected to the lower end of the sampling inclined tube (1), and its lower end is connected to the upper end of the sample row inclined tube (7); the measuring pipeline (10) is provided with an inlet valve (2), a pH meter (4), a mass flow meter (5), and an outlet valve (6) in sequence from top to bottom; and a side-entry agitator (8) is installed at the lower part of the slurry pool (9) of the absorption tower.

2. The device for measuring the pH value and density of desulfurization slurry according to claim 1, characterized in that: It also comprises a flushing water valve (3) and a flushing pipeline (11), wherein the flushing pipeline (11) is connected to the upper part of the measuring pipeline (10), and the flushing water valve (3) is installed on the flushing pipeline (11).

3. A device for measuring pH value and density of desulfurization slurry according to claim 2, characterized in that: The measuring pipeline (10) and the flushing pipeline (11) are both made of carbon steel rubber-lined pipelines.

4. A device for measuring pH value and density of desulfurization slurry according to claim 2, characterized in that: The measuring pipeline (10) and the flushing pipeline (11) are both made of 2205 stainless steel.

5. The device for measuring pH value and density of desulfurization slurry according to claim 2, characterized in that: The inlet valve (2), flushing water valve (3) and outlet valve (6) are all rubber-lined butterfly valves.

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