Measurement Method of Sampling Device for Continuous Automatic Measurement of Slurry Density and pH Value in Desulfurization Absorption Tower

Abstract

A sampling device for continuous and automatic measurement of slurry density and pH value in a desulfurization absorption tower. The prior art is installed in the outlet pipe branch of a slurry discharge pump. Due to blockage or leakage of the sampling pipe, the measurement accuracy is affected. The gravity flow type can only perform intermittent sampling and measurement, and the pH value cannot be measured continuously. The present invention comprises: a connecting steel pipe (1), one end of which is sequentially connected to a conical sleeve A (2), a conical sleeve B (3), and a conical sleeve C (4). The conical sleeve C is connected to the steel pipe body (8) through a flange A (5). The left side of the steel pipe body is connected to a pH meter interface (6) through a connecting flange (7). The right side of the steel pipe body is respectively connected to a pressure transmitter interface A (14) and a pressure transmitter interface B (16). The upper portion of the steel pipe body is connected to an emptying pipe (12) through a flange B (10). The front end of the steel pipe body is connected to an overflow pipe (28) through an overflow pipe flange (9). The present invention is a sampling device for continuous and automatic measurement of slurry density and pH value in a desulfurization absorption tower.

Description

Technical Field

[0001] The invention relates to the technical field of environmentally friendly desulfurization, and in particular to a desulfurization absorption tower slurry density and pH value continuous automatic measurement sampling device. Background Art

[0002] The limestone-gypsum flue gas desulfurization system is the main system for coal-fired power plants to remove sulfur dioxide from flue gas and ensure that flue gas pollutants meet emission standards. The slurry density and pH value of the absorption tower are important operating parameters that need to be monitored during the desulfurization operation. Currently, there are generally two types of slurry density and pH value measuring devices: one is installed in the outlet pipe branch of the slurry discharge pump, but due to blockage and leakage of the sampling pipeline, the measurement accuracy of the slurry density and pH meter is affected; the other is a gravity sampling device that can only take samples and measurements intermittently, resulting in the inability to continuously measure the pH value. Summary of the Invention

[0003] The purpose of the present invention is to provide a continuous and automatic measurement sampling device and measurement method for the density and pH value of the slurry in a desulfurization absorption tower. The device transports the internal slurry to the outside of the tower by gravity, and then measures the slurry density and pH value, thereby avoiding the influence of the internal device of the absorption tower on the measurement results, improving the accuracy of parameter measurement, and no longer requiring a slurry discharge pump pipeline, thereby saving the energy consumption of the slurry discharge pump.

[0004] The above purpose is achieved through the following technical solutions:

[0005] A continuous and automatic measurement sampling device for the density and pH value of slurry in a desulfurization absorption tower comprises: a connecting steel pipe, one end of which is connected in sequence to a conical sleeve A, a conical sleeve B, and a conical sleeve C, the conical sleeve C being connected to the steel pipe body via a flange A, the left side of the steel pipe body being connected to a pH meter interface via a connecting flange, the right side of the steel pipe body being respectively connected to a pressure transmitter interface A and a pressure transmitter interface B, the top of the steel pipe being connected to a drain pipe via a flange B, the front end of the steel pipe being connected to the overflow pipe via an overflow pipe flange, a manual butterfly valve A being installed between the two flanges of the drain pipe, an exhaust duct A being installed on the pressure transmitter interface A, and an exhaust duct B being installed on the pressure transmitter interface B, the side of the conical sleeve B being connected to the manual butterfly valve B via an underflow pipe.

[0006] The desulfurization absorption tower slurry density and pH value continuous automatic measurement sampling device, the diaphragm valve is respectively connected to the absorption tower and pneumatic valve A, the pneumatic valve A is respectively connected to the pneumatic valve B and the pneumatic valve C, the pneumatic valve B is connected to the connecting steel pipe, the manual butterfly valve B is connected to the pit through the pipeline, the pH meter interface is connected to the pH electrode, the pressure transmitter interface A is connected to the pressure transmitter A, the pressure transmitter interface B is connected to the pressure transmitter B, the overflow pipe is connected to the pit, and the pneumatic valve C is connected to the process water flushing system.

[0007] A device and method for continuously and automatically measuring the density and pH value of slurry in a desulfurization absorption tower. The method comprises the following steps: first, a slurry sampling port, i.e., a pH meter interface, is installed at a position 0.5 m from the bottom of the absorption tower. Under the action of the slurry pressure in the absorption tower, the slurry passes through a diaphragm valve, a pneumatic valve A, and a pneumatic valve B and enters the measurement sampling device from the bottom of the measurement sampling device. After the slurry fills the measurement sampling device, it flows out through an overflow hole and is discharged into a nearby pit. The measurement sampling device calculates the corresponding slurry density through the pressure generated by a fixed height difference, and measures the slurry pH value in real time using a pH electrode.

[0008] Step 1: Open the diaphragm valve, pneumatic valve A, and pneumatic valve B. The slurry enters the measuring and sampling device and overflows from the overflow pipe.

[0009] Step 2: After the slurry enters the measuring and sampling device, open the drain valve, that is, close the manual butterfly valve A after the manual butterfly valve A discharges the gas;

[0010] Step 3: Calculate the slurry density using the difference between the two pressure transmitters, and continuously measure the slurry pH value using a pH electrode;

[0011] Step 4: After running for a period of time or finding that the online density value and pH value deviate greatly from the manual test value, close pneumatic valve A, keep pneumatic valve B open, open and flush pneumatic valve C, flush the sampling device, and after flushing, close pneumatic valve B, open pneumatic valve A, flush the inlet pipeline of the sampling device, and after flushing for a period of time, i.e. 5 to 10 minutes, close pneumatic valve C, open pneumatic valve B, and then put the sampling device into operation again.

[0012] Beneficial effects:

[0013] 1. The present invention is a continuous and automatic measurement sampling device for the density and pH value of slurry in a desulfurization absorption tower. The structure uses gravity to transport the internal slurry to the outside of the tower, and then measures the slurry density and pH value, thereby avoiding the influence of the internal devices of the absorption tower on the measurement results, improving the accuracy of parameter measurement, and eliminating the need for a slurry discharge pump pipeline, thereby saving the energy consumption of the slurry discharge pump.

[0014] 2. The flange connectors of the present invention are all made of stainless steel, and the steel pipes are seamless stainless steel pipes. This material has high corrosion resistance and high strength, which effectively increases the service life and measurement quality of the measuring and sampling device.

[0015] 3. The conical sleeve A, conical sleeve B and conical sleeve C at the lower part of the body of the present invention are composed of three concentric large and small head connectors, which are connected by internal and external welding, with good processability and cost saving. At the same time, it can effectively ensure the sealing of the conical sleeve, making the product safe and environmentally friendly to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 It is attached Figure 1 Left view of .

[0018] Figure 3 It is the process flow chart of this application.

[0019] 1. Connecting steel pipe, 2. Conical sleeve A, 3. Conical sleeve B, 4. Conical sleeve C, 5. Flange A, 6. pH meter interface, 7. Connecting flange, 8. Steel pipe body, 9. Overflow pipe flange, 10. Flange B, 11. Manual butterfly valve A, 12. Drain pipe, 13. Exhaust duct A, 14. Pressure transmitter interface A, 15. Exhaust duct B, 16. Pressure transmitter interface B, 17. Manual butterfly valve B, 18. Diaphragm valve, 19. Pneumatic valve A, 20. Pneumatic valve B, 21. Pit, 22. Process water flushing system, 23. Pneumatic valve C, 24. pH electrode, 25. Underflow pipe, 26. Pressure transmitter A, 27. Pressure transmitter B. DETAILED DESCRIPTION

[0020] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to examples and drawings. Specific implementation methods of the present invention will be described below. It should be noted that in the specific description of these implementation methods, for the sake of clarity and clarity, it is impossible for this specification to provide a detailed description of all features of the actual implementation methods.

[0021] Example 1:

[0022] A continuous and automatic measurement and sampling device for the density and pH value of slurry in a desulfurization absorption tower comprises: a connecting steel pipe 1, one end of which is connected in sequence to a conical sleeve A2, a conical sleeve B3, and a conical sleeve C4; the conical sleeve C is connected to a steel pipe body 8 via a flange A5; the left side of the steel pipe body is connected to a pH meter interface 6 via a connecting flange 7; the right side is respectively connected to a pressure transmitter interface A14 and a pressure transmitter interface B16; the top is connected to a drain pipe 12 via a flange B10; the front end is connected to an overflow pipe 28 via an overflow pipe flange 9; a manual butterfly valve A11 is installed between the two flanges of the drain pipe; an exhaust duct A13 is installed on the pressure transmitter interface A; an exhaust duct B15 is installed on the pressure transmitter interface B; and the side of the conical sleeve B is connected to a manual butterfly valve B17 via an underflow pipe 25.

[0023] Example 2:

[0024] According to the continuous automatic measurement sampling device for the density and pH value of the desulfurization absorption tower slurry described in Example 1, the diaphragm valve 18 is respectively connected to the absorption tower and the pneumatic valve A19, the pneumatic valve A is respectively connected to the pneumatic valve B20 and the pneumatic valve C23, the pneumatic valve B is connected to the connecting steel pipe, the manual butterfly valve B is connected to the pit 21 through the pipeline, the pH meter interface is connected to the pH electrode 24, the pressure transmitter interface A is connected to the pressure transmitter A26, the pressure transmitter interface B is connected to the pressure transmitter B27, the overflow pipe is connected to the pit, and the pneumatic valve C is connected to the process water flushing system 22.

[0025] Example 3:

[0026] A method for measuring the density and pH value of a desulfurization absorption tower slurry by a continuous and automatic sampling device, the method comprising the following steps:

[0027] First, the slurry sampling port, that is, the pH meter interface, is installed at a position 0.5m away from the bottom of the absorption tower. Under the action of the slurry pressure in the absorption tower, the slurry passes through the diaphragm valve, pneumatic valve A, and pneumatic valve B and enters the measurement sampling device from the bottom of the measurement sampling device. After the slurry fills the measurement sampling device, it flows out through the overflow hole and is discharged into a nearby pit. The measurement sampling device calculates the corresponding slurry density through the pressure generated by the fixed height difference, and measures the slurry pH value in real time through the pH electrode.

[0028] Step 1: Open the diaphragm valve, pneumatic valve A, and pneumatic valve B. The slurry enters the measuring and sampling device and overflows from the overflow pipe.

[0029] Step 2: After the slurry enters the measuring and sampling device, open the drain valve, that is, close the manual butterfly valve A after the manual butterfly valve A discharges the gas;

[0030] Step 3: Calculate the slurry density using the difference between the two pressure transmitters, and continuously measure the slurry pH value using a pH electrode;

[0031] Step 4: After running for a period of time or when it is found that the online density value and pH value deviate greatly from the manual test value, close the pneumatic valve A, keep the pneumatic valve B open, open the flushing pneumatic valve C, and flush the sampling device. After flushing, close the pneumatic valve B, open the pneumatic valve A, and flush the inlet pipeline of the sampling device. After flushing for a period of time, that is, 5 to 10 minutes, close the pneumatic valve C, open the pneumatic valve B, and then put the sampling device into operation again;

[0032] If the sampling device needs to be repaired, the diaphragm valve needs to be closed, the manual butterfly valve for draining at the bottom needs to be opened, and the slurry inside the sampling device needs to be drained before repair.

[0033] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention is disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technology of the present invention are all within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.

Claims

1. A continuous automatic measurement and sampling device for the density and pH value of slurry in a desulfurization absorption tower, comprising: The connecting steel pipe is characterized in that: one end of the connecting steel pipe is connected to the conical sleeve A, the conical sleeve B, and the conical sleeve C in sequence. The conical sleeve A, the conical sleeve B, and the conical sleeve C are composed of three concentric reducer connectors and are connected by internal and external welding. The conical sleeve C is connected to the steel pipe body through the flange A. The left side of the steel pipe body is connected to the pH meter interface through the connecting flange, and the right side is respectively connected to the pressure transmitter interface A and the pressure transmitter interface B. The top is connected to the drain pipe through the flange B, and the front end is connected to the overflow pipe through the overflow pipe flange. A manual butterfly valve A is installed between the two flanges of the drain pipe. The pressure transmitter interface A is installed with an exhaust duct A, and the pressure transmitter interface B is installed with an exhaust duct B. The side of the conical sleeve B is connected to the manual butterfly valve B through an underflow pipe. The diaphragm valve is connected to the absorption tower and pneumatic valve A respectively. The pneumatic valve A is connected to the pneumatic valve B and the pneumatic valve C respectively. The pneumatic valve B is connected to the connecting steel pipe. The manual butterfly valve B is connected to the pit through a pipeline. The pH meter interface is connected to the pH electrode. The pressure transmitter interface A is connected to the pressure transmitter A. The pressure transmitter interface B is connected to the pressure transmitter B. The overflow pipe is connected to the pit. The pneumatic valve C is connected to the process water flushing system.

2. A method for measuring the density and pH value of the desulfurization absorption tower slurry using the continuous automatic measurement sampling device according to claim 1, characterized in that: The following steps are involved: First, the slurry sampling port, that is, the pH meter interface, is installed at a position 0.5m away from the bottom of the absorption tower. Under the action of the slurry pressure in the absorption tower, the slurry passes through the diaphragm valve, pneumatic valve A, and pneumatic valve B and enters the measurement sampling device from the bottom of the measurement sampling device. After the slurry fills the measurement sampling device, it flows out through the overflow hole and is discharged into a nearby pit. The measurement sampling device calculates the corresponding slurry density through the pressure generated by the fixed height difference, and measures the slurry pH value in real time through the pH electrode. Step 1: Open the diaphragm valve, pneumatic valve A, and pneumatic valve B. The slurry enters the measuring and sampling device and overflows from the overflow pipe. Step 2: After the slurry enters the measuring and sampling device, open the drain valve, that is, close the manual butterfly valve A after the manual butterfly valve A discharges the gas; Step 3: Calculate the slurry density using the difference between the two pressure transmitters, and continuously measure the slurry pH value using a pH electrode; Step 4: After running for a period of time or finding that the online density value and pH value deviate greatly from the manual test value, close pneumatic valve A, keep pneumatic valve B open, open and flush pneumatic valve C, and flush the sampling device. After flushing, close pneumatic valve B, open pneumatic valve A, and flush the inlet pipeline of the sampling device. After flushing for 5 to 10 minutes, close pneumatic valve C, open pneumatic valve B, and then put the sampling device into operation again.

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