Wet desulphurization slurry density on-line measuring device

Abstract

The utility model discloses a wet desulphurization slurry density on-line measuring device which comprises a slurry pond, a high-position measuring mother pipe, a low-position measuring mother pipe, two manual shutoff valves, a high-position measuring inlet pipe, a low-position measuring inlet pipe, a communicating pipe, a differential pressure densimeter and an electric flushing valve. The high-position measuring mother pipe and the low-position measuring mother pipe which are communicated with the slurry pond are arranged on one side of the slurry pond. One ends of the high and low measuring inlet pipes are communicated with the corresponding measuring mother pipes through manual shut-off valves, the other ends of the high and low measuring inlet pipes are respectively connected with two pressure sensing diaphragm heads of the differential pressure densimeter, and the high and low measuring inlet pipes are communicated through a communicating pipe; compared with the prior art, the densimeter probe has the advantages that the measuring continuity can be ensured, the measuring precision of the densimeter probe is improved, and the densimeter probe is convenient to mount and overhaul.

Description

Technical Field

[0001] This utility model relates to the technical field of wet desulfurization, and in particular to an online measurement device for the density of wet desulfurization slurry. Background Technology

[0002] Wet desulfurization technology is widely used in flue gas desulfurization treatment of coal-fired equipment such as thermal power plants. In wet desulfurization systems, the density of the slurry is a key parameter reflecting the quality of the slurry, and real-time online detection of the slurry density is crucial. Currently, commonly used methods for measuring slurry density include X-ray method, ultrasonic method, and differential pressure method. Among them, differential pressure densitometers are widely used due to their advantages such as low cost, simple structure, and convenient operation. However, traditional differential pressure densitometers are contact measuring instruments, which are easily affected by the installation position and fluid turbulence fluctuations, causing fluctuations in the measured value and zero drift. At the same time, the differential pressure sampling pipeline is prone to blockage, causing measurement termination.

[0003] In addition, differential pressure densitometers are usually installed on the side wall of the slurry tank or absorption tower, requiring a hole to connect the differential pressure transmitter. This installation method has some problems: First, the slurry is prone to stratification due to differences in composition, affecting the representativeness of the measurement data; second, the capillary tube is prone to temperature drift when exposed to air, leading to deviations in the calculated values; third, stirring and blowing air into the absorption tower will form bubbles, which will block the pressure guide tube and cause pressure measurement errors.

[0004] Therefore, existing differential pressure densitometers have problems such as inaccurate measurement, easy pipeline blockage, and inconvenience in installation and maintenance when measuring the density of wet desulfurization slurry, and urgently need to be improved. Summary of the Invention

[0005] The purpose of this invention is to solve the problems in the prior art by proposing an online measurement device for the density of wet desulfurization slurry, which can solve at least one of the above problems.

[0006] To achieve the above objectives, this utility model proposes an online measurement device for wet desulfurization slurry density, comprising a slurry tank, two high- and low-level measuring main pipes, two manual shut-off valves, two high- and low-level measuring inlet pipes, a connecting pipe, a differential pressure density meter, and an electric flushing valve. The slurry tank has two high- and low-level measuring main pipes connected to it on one side. One end of each of the two high- and low-level measuring inlet pipes is connected to its corresponding measuring main pipe via a manual shut-off valve. The other ends of the two high- and low-level measuring inlet pipes are respectively connected to the two pressure-sensing diaphragm heads of the differential pressure density meter. The two high- and low-level measuring inlet pipes are connected to each other via a connecting pipe, which has a flushing pipe connected to it, and an electric flushing valve is installed on the flushing pipe.

[0007] Preferably, the inclination angle of the two measuring tubes at the high and low positions relative to the horizontal plane is 30°.

[0008] Preferably, the distances between the two measuring headers at high and low positions and the bottom of the slurry pool are 2.2 meters and 1.2 meters, respectively.

[0009] Preferably, the inclination of the measuring inlet tube is the same as the inclination of the measuring outlet tube.

[0010] Preferably, the measuring main pipe, measuring inlet pipe and connecting pipe are all made of rubber-lined steel pipe, with an inner diameter of 80mm and a wall thickness of 4mm.

[0011] Preferably, the differential pressure density meter includes two pressure-sensing diaphragm heads, a transmitter, two capillaries, a protective tube, a heater, and a temperature sensor. The transmitter is located at the upper end of the protective tube, and two pressure-sensing diaphragm heads are located on the same side of the protective tube. Both pressure-sensing diaphragm heads are connected to the transmitter through capillaries. The capillaries are located inside the protective tube, and the heater and temperature sensor are located on the protective tube.

[0012] Preferably, the flushing pipe is made of rubber-lined steel pipe with an inner diameter of 50 mm and a wall thickness of 3 mm.

[0013] The beneficial effects of this utility model are as follows: By leading a measuring main pipe out from one side of the slurry pool, and connecting the measuring main pipe to the two pressure measuring ports of the differential pressure densitometer through the measuring inlet pipe, this utility model avoids the problem of slurry pipeline drainage and flushing, ensuring measurement accuracy. It solves the shortcomings of existing differential pressure densitometers, such as low measurement accuracy and susceptibility to measurement value fluctuations and zero-point drift caused by installation location and fluid turbulence. The high and low measuring inlets are connected by a connecting pipe, with one end of the electric flushing valve connected to the connecting pipe and the other end connected to the flushing pipe. Flushing facilitates the removal of air bubbles, avoiding the problem of blockage in the differential pressure sampling pipeline that could cause measurement termination, thus ensuring measurement continuity. Connecting the high and low measuring inlets through the connecting pipe allows for relative flow of the slurry fluid, facilitating air bubble removal and improving the measurement accuracy of the densitometer probe. When equipment malfunctions, maintenance can be performed by manually closing the manual shut-off valve. The manual shut-off valve makes densitometer installation and maintenance convenient, solving the problems of inconvenient installation and maintenance in existing technologies.

[0014] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an online measurement device for wet desulfurization slurry density according to the present invention;

[0016] Figure 2 This is a schematic diagram of the differential pressure density meter.

[0017] In the diagram: 1-Slurry tank, 2-Measuring main pipe, 3-Manual shut-off valve, 4-Measuring inlet pipe, 5-Connecting pipe, 6-Differential pressure density meter, 7-Electric flushing valve, 8-Flushing pipe, 61-Pressure-sensing diaphragm head, 62-Transmitter, 63-Capillary tube, 64-Protective tube, 65-Heater, 66-Temperature sensor. Detailed Implementation

[0018] See Figure 1 , Figure 2 This utility model discloses an online measurement device for wet desulfurization slurry density, comprising a slurry tank 1, two high- and low-position measuring main pipes 2, two manual shut-off valves 3, two high- and low-position measuring inlet pipes 4, a connecting pipe 5, a differential pressure density meter 6, and an electric flushing valve 7. The slurry tank 1 has two high- and low-position measuring main pipes 2 connected to it on one side. One end of each of the two high- and low-position measuring inlet pipes 4 is connected to the corresponding measuring main pipe 2 via a manual shut-off valve 3. The other end of each of the two high- and low-position measuring inlet pipes 4 is connected to the two pressure-sensing diaphragm heads 61 of the differential pressure density meter 6. The two high- and low-position measuring inlet pipes 4 are connected to each other via the connecting pipe 5. The connecting pipe 5 has a flushing pipe 8 connected to it, and the flushing pipe 8 is equipped with an electric flushing valve 7.

[0019] The two measuring mother pipes 2, one high and one low, are tilted at an angle of 30° relative to the horizontal plane. This tilt angle makes it easier for the slurry entering the measuring inlet pipe to circulate with the slurry pool through the connecting pipe, ensuring the freshness of the slurry in the measuring inlet pipe in real time.

[0020] The distances between the two measuring headers 2 at high and low positions and the bottom of the slurry tank 1 are 2.2 meters and 1.2 meters, respectively. This arrangement height makes the density sampling of the slurry tank 1 relatively stable and reliable, and makes the density value measurement of the slurry more accurate.

[0021] The inclination of the measuring inlet pipe 4 is consistent with the inclination of the measuring main pipe 2.

[0022] The measuring main pipe 2, measuring inlet pipe 4, and connecting pipe 5 are all made of rubber-lined steel pipes with an inner diameter of 80mm and a wall thickness of 4mm.

[0023] The differential pressure density meter 6 includes two pressure-sensing diaphragm heads 61, a transmitter 62, two capillary tubes 63, a protective tube 64, a heater 65, and a temperature sensor 66. The transmitter 62 is located at the upper end of the protective tube, and the upper and lower pressure-sensing diaphragm heads 61 are located on the same side of the protective tube 64. The pressure-sensing diaphragm heads 61 are connected to the transmitter 62 through the capillary tubes 63. The capillary tubes 63 are located inside the protective tube 64, and the heater 65 and the temperature sensor 66 are provided on the protective tube 64. The protective tube 64, the heater 65, and the temperature sensor 66 work together to keep the capillary tubes 63 in a constant temperature environment, avoiding the disadvantage of temperature drift caused by the capillary tube being exposed to the air, which leads to deviation in the calculated value.

[0024] The flushing pipe 8 is made of rubber-lined steel pipe with an inner diameter of 50mm and a wall thickness of 3mm.

[0025] The working process of this utility model:

[0026] In the operation of this utility model, an online density measuring device for wet desulfurization slurry, under normal measurement conditions, the manual shut-off valve 3 is in the normally open state. The slurry in the slurry tank 1 passes through the measuring main pipe 2 and the manual shut-off valve 3 in sequence, and finally enters the measuring inlet pipe 4. Then, the pressure values ​​of the high and low measuring inlet pipe 4 are measured by two pressure-sensing diaphragm heads 61 and transmitted to the transmitter 62. Finally, the density is converted by the pressure difference.

[0027] During the rinsing operation, the electric rinsing valve 7 is opened, and industrial water enters the connecting pipe 5 through the rinsing pipe 8. Then, it enters the two measuring inlet pipes 4 at the high and low positions through the two ends of the connecting pipe 5 respectively. Then, it enters the two measuring main pipes 2 at the high and low positions through the two manual shut-off valves 3 respectively. Finally, it enters the slurry tank 1 for rinsing the measuring inlet pipes 4, the high and low measuring main pipes 2 and the pressure-sensitive diaphragm head 61.

[0028] Directly measuring the slurry in slurry tank 1 avoids the drawback that the slurry is prone to stratification due to differences in composition, which affects the representativeness of the measurement data.

[0029] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A wet desulphurization slurry density on-line measuring device, characterized by: The device includes a slurry tank (1), two high and low measuring main pipes (2), two manual shut-off valves (3), two high and low measuring inlet pipes (4), a connecting pipe (5), a differential pressure density meter (6), and an electric flushing valve (7). The slurry tank (1) is provided with two high and low measuring main pipes (2) connected to it on one side. One end of each of the two high and low measuring inlet pipes (4) is connected to the corresponding measuring main pipe (2) through a manual shut-off valve (3). The other end of each of the two high and low measuring inlet pipes (4) is connected to the two pressure-sensing diaphragm heads (61) of the differential pressure density meter (6). The two high and low measuring inlet pipes (4) are connected to each other through a connecting pipe (5). A flushing pipe (8) is provided on the connecting pipe (5) and an electric flushing valve (7) is provided on the flushing pipe (8).

2. The online measuring device for wet desulphurization slurry density according to claim 1, characterized in that: The inclination angle of the two measuring tubes (2) at the high and low positions relative to the horizontal plane is 30°.

3. The online measuring device for wet desulphurization slurry density according to claim 1, characterized in that: The distances between the two measuring headers (2) at high and low positions and the bottom of the slurry pool (1) are 2.2 meters and 1.2 meters, respectively.

4. The online measuring device for density of wet desulphurization slurry according to claim 1, characterized in that: The inclination of the measuring inlet pipe (4) is consistent with the inclination of the measuring main pipe (2).

5. The online measuring device for density of wet desulphurization slurry according to claim 1, characterized in that: The measuring main pipe (2), measuring inlet pipe (4) and connecting pipe (5) are all made of rubber-lined steel pipes with an inner diameter of 80 mm and a wall thickness of 4 mm.

6. The on-line measuring device for wet desulphurization slurry density according to claim 1, characterized in that: The differential pressure density meter (6) includes two pressure-sensing diaphragm heads (61), a transmitter (62), two capillaries (63), a protective tube (64), a heater (65), and a temperature sensor (66). The transmitter (62) is located at the upper end of the protective tube. Two pressure-sensing diaphragm heads (61) are located on the same side of the protective tube (64). The pressure-sensing diaphragm heads (61) are connected to the transmitter (62) through the capillaries (63). The capillaries (63) are located inside the protective tube (64). The heater (65) and the temperature sensor (66) are located on the protective tube (64).

7. The wet desulphurization slurry density on-line measuring device according to any one of claims 1 to 6, characterized in that: The flushing pipe (8) is made of rubber-lined steel pipe with an inner diameter of 50 mm and a wall thickness of 3 mm.

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