LU602000B1

LU602000B1 - Device for measuring density of limestone slurry tank

Info

Publication number: LU602000B1
Application number: LU602000A
Authority: LU
Inventors: Zhenxia Su; Yaxian Li; Aizhen Yu; Chuanzhi Pan; Yang Liu; Peng Liu; Xuesheng Zhang; Yongqiang Luo; Peishu Wang; Shengdong Gao; Lei Wang; Guojing Chen; Zhen Zhang; Xiangyu Meng; Panpan Zhang; Zhuo Chen; fuqiang Shao; Wen An
Original assignee: Huaneng Liaocheng Thermal Power Co Ltd
Priority date: 2025-06-10
Filing date: 2025-06-10
Publication date: 2025-12-10

Abstract

Disclosed is a device for measuring density of a limestone slurry tank, falling within the technical field of environmental protection and energy. The device specifically includes a slurry liquid level measurement structure and a slurry pressure measurement structure, the slurry liquid level measurement structure is mounted at a slurry observation hole position at a top of a slurry tank, and the slurry pressure measurement structure is mounted at an original slurry pressure sampling hole position at a middle part of the slurry tank. By sampling at a top level, the interference and impact of slurry foaming and sedimentation on measurement results are eliminated. By measuring the pressure and liquid level, comprehensive and representative slurry density data are obtained, achieving continuous measurement. After computation by a distributed control system (DCS), the device provides operators with timely and accurate density data to accurately regulate limestone slurry feed quantity and water supplementation.

Description

DESCRIPTION LU602000

DEVICE FOR MEASURING DENSITY OF LIMESTONE SLURRY TANK

TECHNICAL FIELD

The present invention relates to the technical field of environmental protection and energy, and specifically to a device for measuring density of a limestone slurry tank.

BACKGROUND

In wet flue gas desulfurization systems of coal-fired power plants, limestone slurry performance directly impacts desulfurization efficiency. As a critical operational parameter, precise density measurement is essential for process optimization and control. Through precise density monitoring, operators can scientifically regulate feed quantity and water supplementation to maintain slurry concentration within an optimal operating range, ensuring stable and efficient operation of the desulfurization systems.

Currently, limestone slurry density measurement methods include differential pressure type measurements, tuning fork-type measurements, and periodic measurement approaches. However, these conventional limestone slurry density measurement methods exhibit significant limitations. The differential pressure type measurements are susceptible to interference from slurry bubbles and solid deposition, leading to data drift or even measurement failure. The tuning fork-type measurements only reflect localized density values at discrete points, failing to provide process-representative bulk data. While the periodic measurement approaches suffer from severe time lag, incapable of meeting real-time control demands while introducing human error risks. These technical bottlenecks render conventional measurement methods inadequate for achieving continuous, stable, and high-precision density monitoring. In response, the present application provides a novel device for measuring density of a limestone slurry tank.

SUMMARY LU602000

The present invention provides a device for measuring density of a limestone slurry tank to solve the problem that conventional measurement methods are inadequate for achieving continuous, stable, and high-precision density monitoring mentioned in the above background.

The present invention provides the following technical solutions. A device for measuring density of a limestone slurry tank includes a slurry liquid level measurement structure and a slurry pressure measurement structure, the slurry liquid level measurement structure is mounted at a slurry observation hole position at a top of a slurry tank, and the slurry pressure measurement structure is mounted at an original slurry pressure sampling hole position at a middle part of the slurry tank; the slurry pressure measurement structure includes a pressure transmitter connected to the slurry tank, a measurement cavity is arranged on the pressure transmitter, the measurement cavity is located inside the slurry tank, an inner diaphragm is arranged on an inner side of the measurement cavity, an outer side of the measurement cavity is sealed through an outer diaphragm, the inner diaphragm and the outer diaphragm are filled with a filling liquid, and a valve plate is arranged inside the measurement cavity; and an extrusion structure is arranged on the valve plate, strain gauges are arranged on inner sides of the outer diaphragm, and first cleaning scrapers are arranged on the outer side of one end of the measurement cavity away from the inner diaphragm.

Preferably, a fixing plate is arranged at one end of the measurement cavity away from the inner diaphragm, the fixing plate is detachably connected to the measurement cavity, and the outer diaphragm is connected to the fixing plate, with sides of the outer diaphragm and the fixing plate away from the inner diaphragm maintaining a flush alignment.

Preferably, the outer diaphragm is a multi-diaphragm combination design and includes a plurality of diaphragms, the diaphragms are arranged using a circumferential uniform array layout and evenly distributed on the fixing plate, and the strain gauges are arranged on inner sides of the diaphragms.

Preferably, a power groove is disposed on one side of a cavity wall of the 602000 measurement cavity, a first driving structure is arranged inside the power groove, and the valve plate is driven by the first driving structure; and when the valve plate and the inner diaphragm are in a parallel state, an output end of the extrusion structure is located on one side of the valve plate close to the outer diaphragm.

Preferably, the extrusion structure includes a translation structure connected to the valve plate, a tail end of an output shaft of the translation structure is connected to an extrusion plate, an outer diameter of the extrusion plate is the same as that of the valve plate, and sealing strips are arranged on outer side walls of the extrusion plate and the valve plate.

Preferably, a protective structure is arranged outside the measurement cavity, the protective structure includes a protective net cover connected to one end of the measurement cavity away from the inner diaphragm, a second cleaning scraper connected to an outer side wall of the protective net cover, and a power box fixedly sleeved on an outer side the cavity wall of the measurement cavity; and a second driving structure is arranged inside the power box, and the second cleaning scraper is driven by the second driving structure.

Preferably, the protective net cover is spherical, and a middle part of the protective net cover is movably connected to a connecting rod, one end of the connecting rod is connected to the second cleaning scraper, and the other end of the connecting rod is connected to the first cleaning scrapers.

Preferably, the quantity of the first cleaning scrapers is the same as that of the diaphragms, and a thickness value of each first cleaning scraper is not greater than a distance value between two adjacent diaphragms.

Compared to the related art, the present invention has the following beneficial effects. 1. According to the device for measuring density of a limestone slurry tank, by sampling at a top level, the interference and impact of slurry foaming and sedimentation on measurement results are eliminated. By measuring the pressure and liquid level, comprehensive and representative slurry density data are obtained, achieving continuous measurement.

After computation by a distributed control system (DCS), it provides operators With 502000 timely and accurate density data to accurately regulate limestone slurry feed quantity and water supplementation, ensuring stable, timely, and accurate measurement of the limestone slurry density. 2. According to the device for measuring density of a limestone slurry tank, the multi-diaphragm combination design allows stress to be distributed, reducing stress concentration in individual areas, mitigating the risk of micro-crack propagation in the outer diaphragm, thereby prolonging the service life. The device features a self-cleaning function, and contaminants adhering to outer surfaces of the diaphragms can be removed using the scrapers, thereby improving the accuracy of pressure measurements.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram showing the use of the structure according to the present invention;

FIG. 2 is an internal schematic diagram of the structure shown in FIG. 1 according to the present invention;

FIG. 3 is an enlarged schematic diagram of a slurry pressure measurement structure according to the present invention;

FIG. 4 is a cross-sectional schematic diagram of the structure shown in FIG. 3 according to the present invention;

FIG. 5 is an internal schematic diagram of a measurement cavity according to the present invention; and

FIG. 6 is a schematic diagram of a right side of FIG. 5 according to the present invention.

Reference numerals and denotations thereof. 1-slurry liquid level measurement structure; 2-pressure transmitter; 3-limestone slurry tank; 4-protective net cover; 5-second cleaning scraper; 6-sealing ring; 7-power box; 8-measurement cavity; 9-fixing plate; 10-diaphragm; 11-strain gauge; 12-valve plate; 13-translation structure; 14-extrusion plate; 15-first driving structure; 16-power groove; 17-inner diaphragm; 18-second driving structure; 19-connecting rod; and 20-first cleaning scraper.

DETAILED DESCRIPTION LU602000

The technical solutions in the embodiment of the present invention are further described clearly and completely below in combination with the accompanying drawings.

Obviously, the embodiment described is only some, rather than all embodiments of the present invention. Based on the embodiment of the present invention, all other embodiments obtained by those ordinary skilled in the art without creative efforts fall within the scope of protection of the present invention.

The present invention provides an embodiment. Referring to FIGS. 1-6, a device for measuring density of a limestone slurry tank includes a slurry liquid level measurement structure 1 and a slurry pressure measurement structure, and the slurry liquid level measurement structure 1 is mounted at a slurry observation hole position at a top of a slurry tank. In the present application, the slurry liquid level measurement structure 1 employs a non-contact sensing unit to achieve continuous liquid level monitoring. As the slurry liquid level measurement structure 1 belongs to known technology, requiring only the capability for non-contact liquid level monitoring, and no further elaboration will be provided here.

The slurry pressure measurement structure is mounted at an original slurry pressure sampling hole position at a middle part of the slurry tank; and the slurry pressure measurement structure includes a pressure transmitter 2 connected to the slurry tank.

The pressure transmitter 2 is known technology, requiring only the capability to convert fluid pressure signals into standard electrical signals. A measurement cavity 8 is arranged on the pressure transmitter 2, the measurement cavity 8 is located inside the slurry tank, an inner diaphragm 17 is arranged on an inner side of the measurement cavity 8, a fixing plate 9 is arranged at one end of the measurement cavity 8 away from the inner diaphragm 17, the fixing plate 9 is detachably connected to the measurement cavity 8, an outer diaphragm is arranged on the fixing plate 9, one end of the measurement cavity 8 away from the inner diaphragm 17 is sealed through the outer diaphragm, and the inner diaphragm 17 and the outer diaphragm are filled with a filling liquid. The filling liquid may be silicone oll, fluorinated oil, or similar.

During operation of the present application, limestone slurry pressure is transmitted 502000 through the outer diaphragm to the filling fluid, which further acts on the inner diaphragm 17. By employing this dual-diaphragm configuration, the inner diaphragm is protected from corrosion by the medium.

The outer diaphragm is a multi-diaphragm combination design and includes a plurality of diaphragms 10, the diaphragms 10 are arranged using a circumferential uniform array layout, and evenly distributed on the fixing plate 9, with sides of the outer diaphragm and the fixing plate 9 away from the inner diaphragm 17 maintaining a flush alignment. The multi-diaphragm combination design allows stress to be distributed, reducing stress concentration in individual areas, mitigating the risk of micro-crack propagation in the outer diaphragm, thereby prolonging the service life.

The strain gauges 11 are arranged on inner sides of the diaphragms 10. The strain gauges 11 can alter the resistance based on the deformation quantity of the diaphragms 10. The controller within this device can determine whether the diaphragms 10 have deformed to the required extent based on resistance changes from a plurality of strain gauges 11, thereby evaluating the measurement accuracy of the slurry pressure measurement structure.

A valve plate 12 is arranged inside the measurement cavity 8, a power groove 16 is disposed on one side of a cavity wall of the measurement cavity 8, a first driving structure 15 is arranged inside the power groove 16, and the valve plate 12 is driven by the first driving structure 15. The first driving structure 15 is known technology, as long as it can drive the valve plate 12 to rotate. When the valve plate 12 is in an open state, the slurry pressure measurement structure can operate normally. When the valve plate 12 is in a closed state, the measurement cavity 8 is divided by the valve plate 12 into two separate cavity bodies, preventing deformation of the outer diaphragm from affecting the inner diaphragm.

An extrusion structure is arranged on the valve plate 12. When the valve plate 12602000 and the inner diaphragm 17 are in a parallel state, an output end of the extrusion structure is located on one side of the valve plate 12 close to the outer diaphragm. The extrusion structure includes a translation structure 13 connected to the valve plate 12, a tail end of an output shaft of the translation structure 13 is connected to an extrusion plate 14, and an outer diameter of the extrusion plate 14 is the same as that of the valve plate 12. The translation structure 13 can drive the extrusion plate 14 to move along a lengthwise direction of the measurement cavity 8. When the extrusion plate 14 moves, it can compress the filling liquid between the outer diaphragm and the extrusion plate 14, causing the outer diaphragm to deform in the opposite direction. During operation of this device, the controller of this device can regulate the extrusion force applied by the translation structure 13 on the extrusion plate 14 based on the pressure magnitude detected by the pressure transmitter 2 until the extrusion force exerted by the extrusion plate 14 on the filling liquid becomes equal to extrusion force applied by the outer diaphragm on the filling liquid, realizing force equilibrium across two sides of the outer diaphragm, allowing the outer diaphragm to return to its original state, thereby facilitating efficient removal of adhered contaminants from a surface of the outer diaphragm.

Sealing strips are arranged on outer side walls of the extrusion plate 14 and the valve plate 12. The sealing strips are used for improving the sealing property between the inner wall of the measurement cavity 8, the extrusion plate 14 and the valve plate 12.

Moreover, the use effect of the valve plate 12 is improved, and the use effect of the extrusion plate 14 is improved. The material of the sealing strips can be selected according to requirements, and there are no restrictions here.

Based on the above description, during operation of this device, the interference and impact of slurry foaming and sedimentation on measurement results can be eliminated by sampling at a top level through the slurry liquid level measurement structure 1. The pressure of the limestone slurry at a fixed location is monitored in real time through the pressure transmitter 2, further determining a height difference AH between a liquid surface level and a measurement point of the limestone slurry pressure.

Subsequently, the density of the limestone slurry is calculated using a formula, 602000

P1=p*g *AH. Through continuous measurement and DCS-based calculations, the present application provides operators with timely and accurate density data to accurately regulate limestone slurry feed quantity and water supplementation.

Compared to the related art, the present application provides a method for measuring density of a limestone slurry tank, having good characteristics of stability, timeliness and accuracy.

First cleaning scrapers 20 are arranged on the outer side of one end of the measurement cavity 8 away from the inner diaphragm 17, the quantity of the first cleaning scrapers 20 is the same as that of the diaphragms 10, and a thickness value of each first cleaning scraper 20 is not greater than a distance value between two adjacent diaphragms 10. The thickness value of the first cleaning scraper 20 can be set as needed, with no specific limitations imposed here. In this way, during operation of this device, the first cleaning scrapers 20 can be located between the two diaphragms 10, thereby preventing the first cleaning scrapers 20 from obstructing contact between the limestone slurry and the diaphragms 10. When it is necessary to clean the diaphragms 10, contaminants adhering to the diaphragms 10 can be scraped off using the first cleaning scrapers 20, thereby achieving effective cleaning of the diaphragms 10. The material of the first cleaning scrapers 20 may be selected as needed, with no restriction imposed here.

A protective structure is arranged outside the measurement cavity 8, the protective structure includes a protective net cover 4 connected to one end of the measurement cavity 8 away from the inner diaphragm 13, a second cleaning scraper 5 connected to an outer side wall of the protective net cover 4, and a power box 7 fixedly sleeved on an outer side the cavity wall of the measurement cavity 8; and a second driving structure is arranged inside the power box 7, and the second cleaning scraper 5 is driven by the second driving structure. A power output end of the second driving structure is connected to a sealing ring 6, and the sealing ring 6 is connected to the second cleaning scraper 5.

The second driving structure belongs to related art, requiring only the capability for driving the rotation of the second cleaning scraper 5.

During rotation, the second cleaning scraper 5 can scrape off contaminants 592000 adhering to a surface of the protective net cover 4, facilitating the flow of limestone slurry and avoiding excessive pressure loss.

The protective net cover 4 is spherical, and the mesh aperture diameter and material of the protective net cover 4 may be set as required, with no restrictions imposed. The spherical protective net cover 4 can guide fluid smoothly around the sensor, reducing turbulence and vortices, minimizing additional pressure loss, while offering self-cleaning capability to mitigate clogging risks.

A middle part of the protective net cover 4 is movably connected to a connecting rod 19, one end of the connecting rod 19 is connected to the second cleaning scraper 5, and the other end of the connecting rod 19 is connected to the first cleaning scrapers 20.

Through the arrangement of the connecting rod 19, the first cleaning scrapers 20 can be driven to rotate through the connecting rod 19 when the second cleaning scraper 5 rotates, achieving simultaneous cleaning of the protective net cover 4 and the diaphragms 10, thereby enhancing cleaning efficiency.

Electric devices involved in the present application are all related art, and a person skilled in the art may select appropriate models as needed, without limitation or elaboration herein. The operating principle and connection method of the electrical devices involved in the present application are well understood by those skilled in the art.

For those skilled in the art, all electrical devices in the present application are connected to compatible power sources by wires. Based on practical requirements, an appropriate controller shall be selected to fulfill control objectives. Specific connection configurations and operational sequences are detailed in the following description. Based on the work sequence of each electrical component, electrical connection is completed, and detailed connection means thereof are known technologies in the field. An operating principle and work flows are mainly introduced below, with no further elaboration provided regarding electrical control.

In conclusion, during operation of this device for measuring density of a limestone 502000 slurry tank, with its mounting position on the limestone slurry tank 3 being shown in FIG. 1 and FIG. 3, the interference and impact of slurry foaming and sedimentation on measurement results can be eliminated by sampling at a top level through the slurry liquid level measurement structure 1. The pressure of the limestone slurry at a fixed location is monitored in real time through the pressure transmitter 2, further determining the height difference AH between the liquid surface level and the measurement point of the limestone slurry pressure. Subsequently, the density of the limestone slurry is calculated using the formula: P1=p*g *AH. Moreover, when the pressure transmitter 2 is in use, the controller within this device can determine the deformation situation the diaphragms 10 based on the resistance changes from the strain gauges 11. When deformation errors across a plurality of diaphragms 10 become excessive, the diaphragms 10 require cleaning, and the first driving structure 15 drives the valve plate 12 to rotate until the valve plate 12 and the inner diaphragm 17 are in a parallel state. At this time, the measurement cavity 8 is divided into two independent cavity bodies by the valve plate 12. Based on the deformation state of the diaphragms 10, the controller within this device can control the translation structure 13 to apply compressive force to the extrusion plate 14 until the resistances of the strain gauges 11 return to initial values.

At this time, the diaphragms 10 are in the vertical state, the second driving structure 18 drives the sealing ring 6 to rotate, and the sealing ring 6 drives the second cleaning scraper 5 to rotate, causing the second cleaning scraper 5 to drive the first cleaning scrapers 20 for rotation through the connecting rod 19, achieving simultaneous cleaning of the diaphragms 10 and the protective net cover 4, thereby facilitating the continued use of this device.

All standard parts used in the present invention can be purchased from the market according to the actual application requirements, while the special-shaped parts can be customized according to the description of the specification and the attached drawings.

The specific connection methods of each structure employ well-established conventional technical means in the related art, including but not limited to bolted connection. All mechanical parts, components, and equipment conform to conventional types in the related art, which are not elaborated herein.

Moreover, the material of each structural component of the present application Ca 602000 be selected based on the requirements and is not limited herein.

The contents not described in detail in the specification belong to the related art that is well known to those skilled in the art.

Although the above embodiments of the present invention have been shown and described, a person of ordinary skill in the art may make several changes, modifications, substitutions and variations without departing from the principles and spirit of the present invention, and the scope of the present invention is limited by the attached claims and equivalents thereof.

Claims

CLAIMS LU602000

1. A device for measuring density of a limestone slurry tank, comprising a slurry liquid level measurement structure (1) and a slurry pressure measurement structure, wherein the slurry liquid level measurement structure (1) is mounted at a slurry observation hole position at a top of a slurry tank, and the slurry pressure measurement structure is mounted at an original slurry pressure sampling hole position at a middle part of the slurry tank; the slurry pressure measurement structure comprises a pressure transmitter (2) connected to the slurry tank, a measurement cavity (8) is arranged on the pressure transmitter (2), the measurement cavity (8) is located inside the slurry tank, an inner diaphragm (17) is arranged on an inner side of the measurement cavity (8), an outer side of the measurement cavity (8) is sealed through an outer diaphragm, the inner diaphragm (17) and the outer diaphragm are filled with a filling liquid, and a valve plate (12) is arranged inside the measurement cavity (8); and an extrusion structure is arranged on the valve plate (12), strain gauges (11) are arranged on inner sides of the outer diaphragm, and first cleaning scrapers (20) are arranged on the outer side of one end of the measurement cavity (8) away from the inner diaphragm (17).

2. The device for measuring density of a limestone slurry tank according to claim 1, wherein a fixing plate (9) is arranged at one end of the measurement cavity (8) away from the inner diaphragm (17), the fixing plate (9) is detachably connected to the measurement cavity (8), and the outer diaphragm is connected to the fixing plate (9), with sides of the outer diaphragm and the fixing plate (9) away from the inner diaphragm (17) maintaining a flush alignment.

3. The device for measuring density of a limestone slurry tank according to claim 2, wherein the outer diaphragm is a multi-diaphragm combination design and comprises a plurality of diaphragms (10), the diaphragms (10) are arranged using a circumferential uniform array layout and evenly distributed on the fixing plate (9), and the strain gauges (11) are arranged on inner sides of the diaphragms (10).

4. The device for measuring density of a limestone slurry tank according to claim 1 u602000 wherein a power groove (16) is disposed on one side of a cavity wall of the measurement cavity (8), a first driving structure (15) is arranged inside the power groove (16), and the valve plate (12) is driven by the first driving structure (15); and when the valve plate (12) and the inner diaphragm (17) are in a parallel state, an output end of the extrusion structure is located on one side of the valve plate (12) close to the outer diaphragm.

5. The device for measuring density of a limestone slurry tank according to claim 1, wherein the extrusion structure comprises a translation structure (13) connected to the valve plate (12), a tail end of an output shaft of the translation structure (13) is connected to an extrusion plate (14), an outer diameter of the extrusion plate (14) is the same as that of the valve plate (12), and sealing strips are arranged on outer side walls of the extrusion plate (14) and the valve plate (12).

6. The device for measuring density of a limestone slurry tank according to claim 1, wherein a protective structure is arranged outside the measurement cavity (8), the protective structure comprises a protective net cover (4) connected to one end of the measurement cavity (8) away from the inner diaphragm (17), a second cleaning scraper (5) connected to an outer side wall of the protective net cover (4), and a power box (7) fixedly sleeved on an outer side the cavity wall of the measurement cavity (8); and a second driving structure is arranged inside the power box (7), and the second cleaning scraper (5) is driven by the second driving structure.

7. The device for measuring density of a limestone slurry tank according to claim 6, wherein the protective net cover (4) is spherical, and a middle part of the protective net cover (4) is movably connected to a connecting rod (19), one end of the connecting rod (19) is connected to the second cleaning scraper (5), and the other end of the connecting rod (19) is connected to the first cleaning scrapers (20).

8. The device for measuring density of a limestone slurry tank according to claim Pu602000 wherein the quantity of the first cleaning scrapers (20) is the same as that of the diaphragms (10), and a thickness value of each first cleaning scraper (20) is not greater than a distance value between two adjacent diaphragms (10).