Desulfurization slurry density measurement system

Abstract

The utility model relates to a system for measuring the density of desulfurization slurry, which enables part of slurry at an outlet of a disturbance pump to return to a desulfurization absorption tower through a slurry concentration branch line, so that the part of slurry can disturb slurry in a slurry pond of the desulfurization absorption tower, solid phases in the slurry pond are suspended, and solid matters in the slurry are effectively prevented from being deposited. The density of the material flow in the pipeline is measured through the densimeter arranged on the slurry concentration branch line, so that the accuracy and the stability of slurry concentration measurement can be improved. Besides, the throttling orifice plate is arranged at the outlet of the densimeter, so that the flow velocity of the slurry in the densimeter can be reduced, the scouring to a measuring electrode of the densimeter can be reduced, the accuracy and the stability of slurry concentration measurement can be further improved, and the service life of equipment can be prolonged.

Description

Technical Field

[0001] The utility model relates to the field of wet desulfurization in thermal power plants, in particular to a system for measuring the density of desulfurization slurry. Background Art

[0002] The density of the absorber slurry in the wet flue gas desulfurization process of a thermal power plant is a critical parameter for operational monitoring and a prerequisite for the safe and economical operation of the entire desulfurization system. In the face of severe environmental challenges, flue gas emission standards for thermal power plants have become even more stringent. Inaccurate absorber slurry density measurement, if excessively high, can cause pipeline wear and leakage, leading to equipment downtime. Furthermore, operators are unable to adjust the absorber slurry conditions in a timely manner, impacting the unit's flue gas emissions.

[0003] Limestone-gypsum desulfurization is the most mature and widely used flue gas desulfurization technology in China. In this method, accurate measurement of slurry density in the slurry preparation system is key to optimizing ingredient proportioning, adjusting the recirculation pump frequency, and improving slurry quality and efficiency. Slurry quality significantly impacts desulfurization effectiveness, making real-time and accurate slurry density measurement essential. Densitometers commonly used in existing thermal power plants often feature a probe-mounted pipe-mounted structure. The high viscosity of gypsum slurry causes significant erosion and wear on the density meter probe, leading to measurement errors and the inability to achieve real-time measurement. Utility Model Content

[0004] The purpose of the utility model is to provide a system for measuring the density of desulfurization slurry, so as to solve the problems in the prior art that the density meter is easy to wear, resulting in errors in the measurement results and the inability to achieve real-time measurement.

[0005] In order to achieve the above object, the utility model provides a system for measuring the density of desulfurization slurry, which includes a desulfurization absorption tower, a disturbance pump, a pit and a density meter;

[0006] The slurry pool disturbance outlet of the desulfurization absorption tower is connected to the disturbance pump inlet; the outlet of the disturbance pump is connected to the pit; a slurry concentration branch is provided on the outlet pipeline of the disturbance pump, and the outlet of the slurry concentration branch is connected to the slurry pool disturbance inlet of the desulfurization absorption tower; the densitometer is provided on the slurry concentration branch for detecting the density of the slurry in the slurry concentration branch;

[0007] A throttling orifice plate is provided at the outlet of the densitometer for reducing the flow rate of the slurry in the densitometer.

[0008] Optionally, the densitometer is an oscillating densitometer.

[0009] Optionally, the densitometer comprises a housing, a measuring tube, an inlet flange and an outlet flange;

[0010] The measuring tube is arranged inside the housing, and one end of the measuring tube extends to the outside of the housing to form a feed inlet of the densitometer, and the other end of the measuring tube extends to the outside of the housing to form a feed outlet of the densitometer;

[0011] The inlet flange is arranged at the feed inlet of the densitometer, and the outlet flange is arranged at the feed outlet of the densitometer.

[0012] Optionally, a feed flange and a discharge flange are provided on the slurry concentration branch line;

[0013] The inlet flange of the densitometer is connected to the feed flange of the slurry concentration branch by bolts, and the outlet flange of the densitometer is connected to the discharge flange of the slurry concentration branch by bolts;

[0014] The throttling orifice is arranged between the outlet flange and the discharge flange, so that the slurry in the densitometer enters the slurry concentration branch after being decelerated by the throttling orifice.

[0015] Optionally, 1 to 5 throttling circular holes are provided at the center of the throttling orifice plate.

[0016] Optionally, the ratio of the diameter of the throttling orifice plate to the diameter of the outlet flange is (0.5-0.8):1.

[0017] Optionally, the ratio of the diameter of the throttling hole to the diameter of the measuring tube is (0.3-0.6):1.

[0018] Optionally, the slurry concentration branch includes a circulating slurry bypass;

[0019] One end of the circulating slurry bypass is communicated with an inlet pipeline of the densitometer, and the other end of the circulating slurry bypass is communicated with an outlet pipeline of the densitometer.

[0020] Optionally, a feed shut-off valve is provided on the inlet pipeline of the density meter, a discharge shut-off valve is provided on the outlet pipeline of the density meter, and a spare shut-off valve is provided on the circulating slurry bypass, so that the purpose of slurry disturbance can be achieved through the circulating slurry bypass when the density meter is blocked.

[0021] Optionally, a detection unit is provided on the outlet pipeline of the disturbance pump for detecting the pH value and flow rate of the slurry.

[0022] Through the above technical solution, part of the slurry at the outlet of the disturbance pump is returned to the desulfurization absorption tower via the slurry concentration branch line. This part of the slurry can disturb the slurry in the slurry pool of the desulfurization absorption tower, suspending the solid phase in the slurry pool and effectively preventing the sedimentation of solid matter in the slurry. By measuring the density of the flow in the pipeline with a densitometer installed on the slurry concentration branch line, the accuracy and stability of the slurry concentration measurement can be improved. In addition, the provision of a throttling orifice at the outlet of the densitometer can reduce the flow rate of the slurry in the densitometer and reduce the scouring of the densitometer's measuring electrodes, which can not only further improve the accuracy and stability of the slurry concentration measurement, but also extend the service life of the equipment.

[0023] Other features and advantages of the present invention will be described in detail in the subsequent detailed description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of a system for measuring the density of desulfurization slurry according to the present invention.

[0026] Figure 2 It is a schematic diagram of a density meter of the present utility model.

[0027] Figure 3 It is a schematic diagram of a throttling orifice plate of the utility model.

[0028] Description of Reference Numerals

[0029] 1 Desulfurization absorption tower; 2 disturbance pump; 3 detection unit; 4 pit; 5 density meter; 6 throttling orifice plate; 7A feed flange; 7B discharge flange; 8 inlet flange; 9 outlet flange; 10 throttling hole. DETAILED DESCRIPTION

[0030] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0031] like Figure 1 As shown, the utility model provides a system for measuring the density of desulfurization slurry, which includes a desulfurization absorption tower 1, a disturbance pump 2, a pit 4 and a density meter 5;

[0032] The slurry pool disturbance outlet of the desulfurization absorption tower 1 is connected to the inlet of the disturbance pump 2; the outlet of the disturbance pump 2 is connected to the pit 4; a slurry concentration branch is provided on the outlet pipeline of the disturbance pump 2, and the outlet of the slurry concentration branch is connected to the slurry pool disturbance inlet of the desulfurization absorption tower 1; the densitometer 5 is provided on the slurry concentration branch for detecting the density of the slurry in the slurry concentration branch;

[0033] A throttling orifice plate 6 is provided at the outlet of the densitometer 5 for reducing the flow rate of the slurry in the densitometer 5 .

[0034] Through the above technical solution, part of the slurry at the outlet of the disturbance pump 2 is returned to the desulfurization absorption tower 1 via the slurry concentration branch line, which can cause part of the slurry to disturb the slurry in the slurry pool of the desulfurization absorption tower 1, suspending the solid phase in the slurry pool, effectively preventing the sedimentation of solid matter in the slurry. The density of the logistics in the pipeline is measured by the density meter 5 set on the slurry concentration branch line, which can improve the accuracy and stability of the slurry concentration measurement. In addition, the throttling orifice plate 6 is set at the outlet of the density meter 5, which can reduce the flow rate of the slurry in the density meter 5 and reduce the scouring of the measuring electrodes of the density meter 5. This can not only further improve the accuracy and stability of the slurry concentration measurement, but also increase the service life of the equipment.

[0035] In one embodiment, the desulfurization absorption tower 1 described in the present invention is a conventional choice in the art, and this application does not make any special requirements.

[0036] In one embodiment, the lower chamber of the desulfurization absorption tower 1 forms a slurry pool for receiving limestone-gypsum slurry; a slurry distributor is provided in the upper chamber of the desulfurization absorption tower 1, for allowing fresh limestone slurry and slurry in the slurry pool to enter the desulfurization absorption tower 1 through the distributor, and allowing the slurry to enter the slurry pool under the action of gravity.

[0037] In one embodiment, the disturbance outlet is provided at the lower part of the desulfurization absorption tower 1 and at the upper and lower parts of the slurry pool, and the disturbance outlet is used to communicate with the inlet of the disturbance pump 2 so that the slurry in the slurry pool can enter the disturbance pump 2.

[0038] In one embodiment, shut-off valves are provided on both the disturbance outlet pipeline at the upper portion of the slurry pool and the disturbance outlet pipeline at the lower portion of the slurry pool to flexibly switch the flow direction of the slurry.

[0039] In one embodiment, the disturbance inlet is provided at the lower portion of the slurry pool so that the slurry in the slurry concentration branch can enter the slurry pool to achieve disturbance treatment.

[0040] In one embodiment, a disturbance nozzle is provided at the disturbance inlet, and the inlet of the disturbance nozzle is connected to the outlet of the slurry concentration branch, so that the slurry in the slurry concentration branch can be sprayed into the slurry pool through the disturbance nozzle, thereby improving the disturbance effect.

[0041] In one embodiment, the disturbance nozzle described in the present invention is a conventional choice in the art, and this application does not make any special requirements, as long as it can increase the outflow speed of the slurry.

[0042] In the above embodiment, the slurry in the absorption tower slurry pool is extracted by the disturbance pump 2 and pumped into the disturbance nozzle layer in the tower. The disturbance nozzle sprays the slurry toward the bottom of the absorption tower slurry pool. The slurry sprayed by the disturbance nozzle has a high flow rate, which causes the slurry in the slurry pool to be disturbed and suspended, effectively preventing the deposition of solid matter in the slurry. During the absorption tower shutdown period, the disturbance system can be shut down, especially when the auxiliary equipment of the absorption tower is under maintenance, the disturbance system can be stopped to save electricity. When the absorption tower is ready to start operation, the disturbance pump 2 is started first, and the slurry with a low solid content in the upper part of the tower slurry pool is extracted and pumped into the disturbance nozzle layer through the disturbance pump 2 to disturb the absorption tower slurry. After the slurry in the slurry pool at the bottom of the tower is evenly disturbed, the inlet valve of the pump is switched to extract the slurry at the bottom of the slurry pool for circulated disturbance to enhance the disturbance effect. The slurry jet disturbance is conducive to the uniform mixing of the added fresh limestone slurry in the slurry pool.

[0043] In one embodiment, the disturbance pump 2 described in the present invention is a conventional choice in the art, and this application does not make any special requirements. In this embodiment, the maximum power of the disturbance pump 2 can be set according to actual production needs, and no further details are given here.

[0044] In one embodiment, a detection unit 3 is provided on the outlet pipeline of the disturbance pump 2. The detection unit 3 includes a first detection pipeline and a second detection pipeline arranged in parallel. A shut-off valve, a pH detector, and a flow detector are sequentially provided on the first detection pipeline along the flow direction. In this embodiment, the pH detectors on the first and second detection pipelines are used to detect the pH value of the slurry, and the flow detectors on the first and second detection pipelines are used to detect the flow rate of the slurry.

[0045] In one embodiment, the pit 4 described in the present invention is a conventional choice in the art, and this application does not make special requirements. In this embodiment, the size and forming material of the pit 4 can be set according to actual production needs, and no further details are given here.

[0046] In one embodiment, the slurry concentration branch includes a circulating slurry bypass; one end of the circulating slurry bypass is connected to the inlet pipeline of the densitometer 5, and the other end of the circulating slurry bypass is connected to the outlet pipeline of the densitometer 5.

[0047] In one embodiment, a feed shut-off valve is provided on the inlet pipeline of the density meter 5, a discharge shut-off valve is provided on the outlet pipeline of the density meter 5, and a spare shut-off valve is provided on the circulating slurry bypass, so that the purpose of slurry disturbance can be achieved through the circulating slurry bypass when the density meter 5 is blocked.

[0048] In one embodiment, the densitometer 5 of the present invention is an oscillating densitometer, which can reduce clogging of the densitometer 5 to a certain extent and improve measurement accuracy and response rate. In this embodiment, the oscillating densitometer 5 uses the relationship between the oscillation frequency of the solid phase in the liquid phase and the solid phase density to perform measurements.

[0049] In a preferred embodiment, the density meter 5 described in the present invention is an OPTIMASS 7400 density meter.

[0050] like Figure 2 As shown, the density meter 5 includes a housing, a measuring tube, an inlet flange 8 and an outlet flange 9;

[0051] The measuring tube is arranged inside the housing, and one end of the measuring tube extends to the outside of the housing to form a feed inlet of the densitometer 5, and the other end of the measuring tube extends to the outside of the housing to form a feed outlet of the densitometer 5;

[0052] The inlet flange 8 is arranged at the feed inlet of the densitometer 5 , and the outlet flange 9 is arranged at the feed outlet of the densitometer 5 .

[0053] In one embodiment, the densitometer 5 is vertically arranged, and the feeding method of the densitometer 5 is bottom-in and top-out.

[0054] In one embodiment, the connection between the slurry concentration branch and the densitometer 5 is a flange connection. The slurry concentration branch is provided with an inlet flange 7A and an outlet flange 7B. The inlet flange 8 of the densitometer 5 is bolted to the inlet flange 7A of the slurry concentration branch, and the outlet flange 9 of the densitometer 5 is bolted to the outlet flange 7B of the slurry concentration branch.

[0055] The throttling orifice 6 is arranged between the outlet flange 9 and the discharge flange 7B, so that the slurry in the densitometer 5 can enter the slurry concentration branch after being decelerated by the throttling orifice 6.

[0056] In one embodiment, the inlet flange 8, outlet flange 9, feed flange 7A and discharge flange 7B have the same size. The specific size can be flexibly set according to actual production needs, and this application will not elaborate on it.

[0057] In one embodiment, the inlet flange 8, the outlet flange 9, the feed flange 7A and the discharge flange 7B are provided with 4 or 8 bolt fixing holes, and the multiple bolt fixing holes are evenly arranged along the circumference of the flange.

[0058] In one embodiment, the ratio of the distance between any one of the bolt fixing holes and the center of the flange to the diameter of the flange is (0.6-0.9):1.

[0059] In a preferred embodiment, the ratio of the distance between any one of the bolt fixing holes and the center of the flange to the diameter of the flange is 0.9:1.

[0060] like Figure 3 As shown, the throttling orifice plate 6 is a disk with a circular hole at the center, wherein the circular hole is the throttling hole.

[0061] In one embodiment, the throttle orifice plate 6 is made of stainless steel.

[0062] In one embodiment, the number of the throttling circular holes at the center of the throttling orifice plate 6 is 1 to 5, preferably 1.

[0063] In one embodiment, the size of the throttling orifice plate 6 can be flexibly set according to actual production needs, which will not be described in detail here.

[0064] In one embodiment, the ratio of the diameter of the throttling orifice plate 6 to the diameter of the outlet flange 9 is (0.5-0.8):1.

[0065] In a preferred embodiment, the ratio of the diameter of the throttling orifice plate 6 to the diameter of the outlet flange 9 is 0.8:1.

[0066] In one embodiment, depending on the size of the throttle orifice plate 6, a bolt fixing hole may be provided on the throttle orifice plate 6, or no bolt fixing hole may be provided; when the diameter of the throttle orifice plate 6 is smaller than the distance between the bolt fixing hole and the center of the flange, no bolt fixing hole is provided on the throttle orifice plate 6; when the diameter of the throttle orifice plate 6 is larger than the distance between the bolt fixing hole and the center of the flange, a bolt fixing hole is provided on the throttle orifice plate 6.

[0067] In one embodiment, the ratio of the diameter of the throttling hole to the diameter of the measuring tube is (0.3-0.6):1.

[0068] In a preferred embodiment, the ratio of the diameter of the throttling hole to the diameter of the measuring tube is 0.5:1.

[0069] In this embodiment, the diameter of the throttling hole is smaller than the diameter of the measuring tube, so that the slurry in the densitometer 5 is partially blocked when passing through the throttling hole plate 6, thereby reducing the flow rate of the slurry in the densitometer.

[0070] The disclosed system allows a portion of the slurry to disturb the slurry in the desulfurization absorption tower's slurry pool, suspending the solid phase in the pool and effectively preventing the sedimentation of solids in the slurry. A densitometer installed on the slurry concentration branch line measures the density of the flow in the pipeline, improving the accuracy and stability of slurry concentration measurements. Furthermore, a throttling orifice plate installed at the densitometer outlet reduces the flow rate of the slurry in the densitometer, reducing erosion of the densitometer's measuring electrodes. This not only further improves the accuracy and stability of slurry concentration measurements, but also increases the service life of the equipment.

[0071] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0072] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0073] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A system for measuring the density of desulfurization slurry, characterized in that: The system includes a desulfurization absorption tower (1), a disturbance pump (2), a pit (4) and a density meter (5); The slurry pool disturbance outlet of the desulfurization absorption tower (1) is communicated with the inlet of the disturbance pump (2); the outlet of the disturbance pump (2) is communicated with the pit (4); a slurry concentration branch is provided on the outlet pipeline of the disturbance pump (2), and the outlet of the slurry concentration branch is communicated with the slurry pool disturbance inlet of the desulfurization absorption tower (1); the densitometer (5) is provided on the slurry concentration branch for detecting the density of the slurry in the slurry concentration branch; A throttling orifice plate (6) is provided at the outlet of the densitometer (5) for reducing the flow rate of the slurry in the densitometer (5).

2. The system according to claim 1, wherein: The densitometer (5) is an oscillating type densitometer.

3. The system according to claim 1, wherein: The density meter (5) comprises a housing, a measuring tube, an inlet flange (8) and an outlet flange (9); The measuring tube is arranged inside the housing, and one end of the measuring tube extends to the outside of the housing to form a feed inlet of the densitometer (5), and the other end of the measuring tube extends to the outside of the housing to form a feed outlet of the densitometer (5); The inlet flange (8) is arranged at the feed inlet of the densitometer (5), and the outlet flange (9) is arranged at the feed outlet of the densitometer (5).

4. The system according to claim 3, characterized in that The slurry concentration branch is provided with a feed flange (7A) and a discharge flange (7B); The inlet flange (8) of the densitometer (5) is connected to the feed flange (7A) of the slurry concentration branch by bolts, and the outlet flange (9) of the densitometer (5) is connected to the discharge flange (7B) of the slurry concentration branch by bolts; The throttling orifice (6) is arranged between the outlet flange (9) and the discharge flange (7B) so that the slurry in the densitometer (5) enters the slurry concentration branch after being decelerated by the throttling orifice (6).

5. The system according to claim 3, wherein: One to five throttling circular holes are provided at the center of the throttling orifice plate (6).

6. The system according to claim 5, characterized in that The ratio of the diameter of the throttling orifice plate (6) to the diameter of the outlet flange (9) is (0.5-0.8):

1.

7. The system according to claim 5, characterized in that The ratio of the diameter of the throttling hole to the diameter of the measuring tube is (0.3-0.6):

1.

8. The system according to claim 1, wherein: The slurry concentration branch includes a circulating slurry bypass; One end of the circulating slurry bypass is communicated with the inlet pipeline of the densitometer (5), and the other end of the circulating slurry bypass is communicated with the outlet pipeline of the densitometer (5).

9. The system according to claim 8, characterized in that A feed shut-off valve is provided on the inlet pipeline of the densitometer (5), a discharge shut-off valve is provided on the outlet pipeline of the densitometer (5), and a spare shut-off valve is provided on the circulating slurry bypass, so that the purpose of slurry disturbance can be achieved through the circulating slurry bypass when the densitometer (5) is blocked.

10. The system according to claim 1, wherein: The outlet pipeline of the disturbance pump (2) is provided with a detection unit (3) for detecting the pH value and flow rate of the slurry.

Images