Slurry density measuring device and method, absorption tower and slurrying pool

Abstract

The invention relates to a slurry density measuring device and method, an absorption tower and a slurrying pool, the slurry density measuring device comprises a density measuring tank, the density measuring tank is connected with one end of a slurry inlet pipe, the other end of the slurry inlet pipe is used for being connected with a slurry container, a drop hammer is arranged in the density measuring tank, and the density of the drop hammer is larger than the maximum density of measured slurry; the drop hammer is connected to the top of the density measuring tank through a tension detecting element, the density measuring tank is further connected with an overflow pipe, the outlet end of the overflow pipe is higher than the top of the drop hammer, and the measuring device is low in cost and accurate in measuring result.

Description

Technical Field

[0001] The present invention relates to the technical field of slurry density measurement in wet desulfurization processes, and particularly relates to a slurry density measurement device, method, absorption tower, and pulp making tank. Background Art

[0002] The statements herein only provide background art related to the present invention and do not necessarily constitute prior art.

[0003] In the vast majority of wet desulfurization systems, the slurry density in the absorption tower and the slurry density in the pulp making tank are extremely important data parameters. During pulp making, the lime addition amount in the pulp making tank needs to be adjusted according to the density of the pulp being made; when controlling the slurry discharge from the absorption tower, the slurry supply amount to the absorption tower also needs to be controlled according to the slurry density in the absorption tower. Therefore, measuring the slurry density in the absorption tower is an important task in wet desulfurization.

[0004] Currently, the most commonly used methods for measuring the density in wet desulfurization are mass density meters or differential pressure density meters. Among them, the mass density meter has a higher measurement accuracy, but the equipment is expensive (common products are in the range of 50,000 yuan - 100,000 yuan), which is undoubtedly a significant expense for users with greater cost pressure; using a differential pressure transmitter to measure density is relatively inexpensive, but since the slurry in the absorption tower is constantly flowing and the oxidation air fills the slurry, it has a huge impact on the differential pressure measurement value, and the measured differential pressure value drifts too much, often unable to meet the measurement accuracy requirements. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a slurry density measurement device, method, absorption tower, and pulp making tank. The measurement device combines the advantages and disadvantages of a mass density meter and a differential pressure transmitter, has a low manufacturing cost, and meets the measurement accuracy requirements.

[0006] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a slurry density measurement device, including a density measurement tank. The density measurement tank is connected to one end of a feed pipe, and the other end of the feed pipe is used to connect to a slurry container. Inside the density measurement tank, there is a plumb bob. The density of the plumb bob is greater than the maximum density of the slurry to be measured. The plumb bob is connected to the top of the density measurement tank through a tension detection element. The density measurement tank is also connected to an overflow pipe, and the outlet end of the overflow pipe is higher than the top of the plumb bob.

[0008] Optionally, the feed pipe is provided with a first flow regulating valve. The bottom of the density measurement tank is in an inverted conical structure, and the bottom of the inverted conical structure is connected to a discharge pipe. The discharge pipe is provided with a second flow regulating valve.

[0009] Optionally, the axis of the overflow pipe is parallel to the axis of the density measurement tank, and the axes of the overflow pipe and the density measurement tank are both vertically arranged.

[0010] Optionally, the tension detection element is a tensiometer, which is connected to the top of the density measurement tank, and the tensiometer is connected to the top of the hanging weight through a suspension rope.

[0011] Optionally, the density of the hanging weight is 1.2 to 1.3 times the maximum density of the measured slurry.

[0012] Optionally, the hanging weight adopts a conical structure. Along the direction from top to bottom, the horizontal cross-sectional area of the hanging weight gradually increases to prevent the slurry from fixedly depositing on the surface of the hanging weight.

[0013] Optionally, the slurry inlet pipe is further connected with a flushing pipe, and a valve is arranged on the flushing pipe to control the on-off of the flushing pipe.

[0014] In a second aspect, an embodiment of the present invention provides a working method of the slurry density measurement device described in the first aspect, including the following steps:

[0015] Read the tension value of the tension detection element as the first tension value when the density measurement tank is in an empty tank state;

[0016] Introduce slurry into the density measurement tank through the slurry inlet pipe, and discharge the slurry in the density measurement tank through the slurry outlet pipe. Control the slurry inlet flow rate of the slurry inlet pipe to be greater than the slurry discharge flow rate of the slurry outlet pipe until the slurry liquid level in the density measurement tank exceeds the inlet of the overflow pipe to maintain stability;

[0017] Read the tension value of the tension detection element as the second tension value;

[0018] Obtain the density of the measured slurry through the first tension value, the second tension value and the volume of the hanging weight.

[0019] In a third aspect, an embodiment of the present invention provides an absorption tower, including a tower body, and further including the slurry density measurement device described in the first aspect, wherein the slurry inlet pipe is connected to the tower body to introduce the slurry in the tower body into the density measurement tank.

[0020] In a fourth aspect, an embodiment of the present invention provides a pulping tank, including a tank body, and further including the slurry density measurement device described in the first aspect, wherein the slurry inlet pipe is connected to the tank body to introduce the slurry in the pulping tank into the density measurement tank.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The slurry density measuring device of the present invention can be realized by a density measuring tank, a plumb bob, a tensile force detecting element and corresponding pipelines and valves. It combines the advantages of a mass type densitometer and a differential pressure transmitter. Compared with using a mass type densitometer for measurement, the equipment cost is greatly reduced, and the investment cost is significantly reduced. At the same time, by using this measurement method, compared with a differential pressure type densitometer, the data fluctuations caused by the slurry flow are eliminated, and the accuracy of the measurement result is improved.

[0023] 2. In the slurry density measuring device of the present invention, the plumb bob adopts a conical structure, and along the direction from top to bottom, the horizontal cross-sectional area of the plumb bob gradually increases, avoiding the deposition of solids in the measured slurry on the surface of the plumb bob and affecting the accuracy of the measurement result.

[0024] 3. The slurry density measuring device of the present invention is provided with a flushing pipe, which can flush the density measuring tank and can also perform density calibration on the measurement of the control system, ensuring the accuracy of the measurement result. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The schematic diagram of the specification attached to the present invention is used to provide a further understanding of the present invention. The schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0026] Figure 1 It is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0027] Among them, 1. Density measuring tank, 2. Inlet slurry pipe, 3. First flow regulating valve, 4. Outlet slurry pipe, 5. Second flow regulating valve, 6. Plumb bob, 7. Tensile force meter, 8. Signal line, 9. Suspension rope, 10. Partition board, 11. Overflow pipe, 12. Flushing pipe, 13. Valve, 14. Tower body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] For the convenience of description, if the words "upper" and "lower" appear in the present invention, they only indicate the same upper and lower directions as those of the attached drawings themselves, and do not limit the structure. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present invention.

[0029] Embodiment 1

[0030] This embodiment provides a slurry density measuring device for measuring the density of slurry in an absorption tower or a pulp making tank, such as Figure 1As shown in the figure, it includes a density measurement tank 1, and the density measurement tank 1 can be a cylindrical tank, a cubic tank or a tank of other shapes, which can be set by those skilled in the art according to actual needs. The axis of the density measurement tank 1 is set vertically. When measuring the density of the slurry in the absorption tower, the density measurement tank 1 is arranged on one side of the absorption tower. When measuring the density of the slurry in the pulp making tank, the density measurement tank 1 is arranged on one side of the pulp making tank.

[0031] In this embodiment, the bottom of the density measurement tank 1 is connected to the top end of the support, and the bottom end of the support is used to be fixed on the ground foundation, and the density measurement tank 1 is supported by the support. The support can adopt a plurality of support columns, and cross beams are arranged between adjacent support columns to enhance the structural strength of the whole support.

[0032] The upper part of one side of the density measurement tank 1 is connected to one end of the slurry inlet pipe 2, and the other end of the slurry inlet pipe 2 is used to be connected to a slurry container, and the slurry container is an absorption tower or a pulp making tank. The slurry inlet pipe 2 is used to introduce the slurry in the absorption tower or the pulp making tank into the density measurement tank 1 to realize the measurement of the slurry density.

[0033] In this embodiment, the slurry inlet pipe 2 includes a first pipe section arranged horizontally. One end of the first pipe section is used to be connected to the absorption tower or the pulp making tank, and the other end is vertically connected to one end of a second pipe section. The second pipe section extends downward. The other end of the second pipe section is connected to one end of a third pipe section arranged horizontally. The third pipe section extends into the density measurement tank 1. The end of the third pipe section located in the density measurement tank 1 is vertically connected to one end of a fourth pipe section. The fourth pipe section extends downward, and its other end serves as the outlet end of the slurry.

[0034] A first flow regulating valve 3 is arranged on the slurry inlet pipe 2 for regulating the flow rate of the slurry entering the density measurement tank 1.

[0035] Preferably, the first pipe section of the slurry inlet pipe 2 is provided with the first flow regulating valve 3.

[0036] It can be understood that the slurry inlet pipe 2 can also adopt pipes with other distribution forms, as long as the slurry can be introduced into the density measurement tank 1, and no detailed description will be given here.

[0037] The bottom end of the density measurement tank 1 is of an inverted conical structure, and the center of the bottom end of the inverted conical structure is connected to one end of the slurry outlet pipe 4. The slurry outlet pipe 4 is used to discharge the slurry entering the density measurement tank 1. A second flow regulating valve 5 is arranged on the slurry outlet pipe 4 for regulating the flow rate of the slurry flowing out of the density measurement tank 1.

[0038] In this embodiment, the bottom end of the density measurement tank 1 is connected to the slurry outlet pipe 4 through an inverted conical structure, which avoids the solid precipitation of the slurry at the bottom of the density measurement tank 1.

[0039] Preferably, the slurry outlet pipe 4 adopts a straight pipe with its axis arranged vertically.

[0040] In this embodiment, the slurry inlet pipe 2 is connected to the upper part of the density measurement tank 1, and the slurry outlet pipe 4 is connected to the bottom of the density measurement tank 1. The slurry in the density measurement tank 1 adopts the form of flowing in from the top and out from the bottom, ensuring a good flow field in the density measurement tank.

[0041] A plumb bob 6 is provided inside the density measurement tank 1. The plumb bob 6 is connected to a tensile force detection element, and the tensile force detection element is connected to the top of the density measurement tank 1. The tensile force detection element can detect the tensile force value generated by the plumb bob 6 on it.

[0042] In this embodiment, the density measurement tank 1 includes a tank body. The top of the tank body is open, and the top of the tank body is detachably connected with a tank cover by bolts. The tensile force detection element is connected to the bottom surface of the tank cover. By adopting this method, it is convenient to install the tensile force detection element, the plumb bob 6, etc., and it is also convenient to repair, maintain and replace the tensile force detection element and the plumb bob, meeting the requirements of measuring different slurry densities.

[0043] The density of the plumb bob 6 is greater than the maximum density of the measured slurry. Specifically, the density of the plumb bob 6 is 1.2 - 1.3 times the maximum density of the measured slurry. Preferably, the density of the plumb bob 6 is 1.25 times the maximum density of the measured slurry.

[0044] Specifically, in this embodiment, the density range of the measured slurry is 1000 kg / m 3 ~1500 kg / m 3 , and the density of the plumb bob 6 is selected as ρ1 = 1800 kg / m 3 , the volume V of the plumb bob 6 is 0.25 m 3 , and the weight m1 of the plumb bob 6 is 450 kg. It can be understood that those skilled in the art can select the density and volume of the plumb bob 6 according to actual needs, and no detailed description will be given here.

[0045] The tensile force detection element can adopt an existing tensiometer 7. Its shell is made of stainless steel and has a 4 - 20 mA current output function. The tensiometer 7 can adopt existing equipment, and its specific structure will not be described in detail here. The tensiometer 7 is applicable to high-smoke places and is equipped with a 4 - 20 mA hard-wired interface for remote transmission of relevant data.

[0046] In this embodiment, the range of the tensiometer 7 is greater than the weight of the plumb bob 6. Preferably, the range of the tensiometer 7 is 0 - 500 kg, and the accuracy is 1%.

[0047] The signal wire 8 of the tensiometer 7 passes through the tank cover and is connected to the control system, and can transmit the collected tensile force information to the control system.

[0048] In this embodiment, the control system adopts a PLC control system or a DCS control system, and those skilled in the art can set it according to actual needs.

[0049] The top of the tensiometer 7 is connected to the bottom surface of the tank cover at the top of the density measurement tank 1. The bottom end of the tensiometer 7 is connected to one end of the suspension rope 9, and the other end of the suspension rope 9 is connected to the top end of the plumb bob 6.

[0050] The suspension rope 9 can be a flexible rope. When the plumb bob 6 is subjected to the buoyancy of the slurry, the change value of the tension of the tensiometer 7 is the buoyancy received by the plumb bob 6.

[0051] Furthermore, in order to prevent the slurry water mist from contacting the tensiometer 7 and affecting the service life of the tensiometer 7, a partition 10 is provided below the tensiometer 7. The edge of the partition 10 is provided with a flange. The partition 10 is detachably and fixedly connected to the inner side surface of the tank wall of the density measurement tank 1 through the flange and fixing bolts. The partition 10 divides the internal space of the density measurement tank 1 into two areas. The upper area is the weighing area for accommodating the tensiometer 7, and the lower area is the slurry storage area for accommodating the slurry to be measured and the plumb bob 6. The outlet of the feed pipe 2 is connected to the upper part of the slurry storage area. The partition 10 is provided with an opening for the suspension rope 9 to pass through. One end of the suspension rope 9 is connected to the tensiometer 7, and the other end passes through the partition 10 through the through hole and then is connected to the plumb bob 6. The plumb bob 6 is located in the slurry storage area.

[0052] The plumb bob 6 is arranged in the slurry storage area of the density measurement tank. The plumb bob 6 adopts a solid structure in the shape of a cylinder, a cube, a sphere or a cone. In this embodiment, the plumb bob 6 adopts a conical structure. Along the direction from top to bottom, the horizontal cross-sectional area of the plumb bob 6 gradually increases. Preferably, the plumb bob 6 adopts a water droplet-shaped structure.

[0053] The plumb bob 6 is designed with such a structure to prevent the solids in the measured slurry from depositing on the surface of the plumb bob 6 and affecting the accuracy of the measurement result.

[0054] An overflow pipe 11 also extends into the slurry storage area of the density measurement tank 1. The axis of the overflow pipe 11 is parallel to the axis of the density measurement tank 1. The axis of the overflow pipe 11 is vertically arranged. One end of the overflow pipe 11 is located inside the slurry storage area, and the other end extends below the density measurement tank 1 after passing through the inverted conical structure. The end of the overflow pipe 11 located in the slurry storage area is used as the inlet end. The height of the inlet end is higher than the height of the top of the plumb bob 6, so that when the slurry level in the density measurement tank 1 is kept stable due to the overflow of the overflow pipe 11, the slurry level can be higher than the plumb bob 6, so that the plumb bob 6 is completely immersed in the slurry.

[0055] Further, to achieve the flushing of the density measurement tank 1 and ensure the accuracy of the measurement results after multiple measurements, the slurry inlet pipe 2 is also connected to a flushing pipe 12, and the flushing pipe 12 is used to connect to a flushing water source.

[0056] Along the slurry flow direction of the slurry inlet pipe 2, the connection position of the flushing pipe 12 and the slurry inlet pipe 2 is located downstream of the first flow regulating valve 3.

[0057] Preferably, the flushing pipe 12 is connected to the first pipe segment of the slurry inlet pipe 2 and is located downstream of the first flow regulating valve 3.

[0058] A valve 13 is installed on the flushing pipe 12 to control the opening and closing of the flushing pipe.

[0059] In this embodiment, the first flow regulating valve 3 and the second flow regulating valve 5 are both electrically controlled flow regulating valves, which are connected to a control system and can receive instructions from the control system to work and regulate the flow rate of the slurry. The valve 13 on the flushing pipe 12 uses an electrically controlled ball valve or an electrically controlled butterfly valve and other electrically controlled valves, which are connected to the control system and can receive instructions from the control system to work.

[0060] Embodiment 2

[0061] This embodiment provides a working method for the slurry density measuring device described in Embodiment 1, including the following steps:

[0062] When the density measurement tank is in the empty tank 1 state, read the pulling force value of the pulling force detection element as the first pulling force value;

[0063] The slurry inlet pipe 2 feeds slurry into the density measurement tank 1, and the slurry outlet pipe 4 discharges the slurry in the density measurement tank 1. Control the slurry inlet flow rate of the slurry inlet pipe 2 to be greater than the slurry discharge flow rate of the slurry outlet pipe 4 until the slurry liquid level in the density measurement tank 1 exceeds the top inlet of the overflow pipe 11 to maintain stability;

[0064] Read the pulling force value of the pulling force detection element as the second pulling force value;

[0065] Obtain the density of the measured slurry through the first pulling force value, the second pulling force value, and the volume of the plumb bob 6.

[0066] Specifically:

[0067] The volume of the plumb bob 6 should match the measurement range and accuracy of the tensiometer 7, and it should meet the requirement of ensuring the density measurement accuracy when the accuracy of the tensiometer 7 is fed back to the density value when the density of the measured liquid changes. In this embodiment, the density ρ1 of the plumb bob 6 = 1800 kg / m 3 , the volume V of the plumb bob = 0.25 m 3 , and the weight m1 of the plumb bob = 450 kg. The working method includes the following steps:

[0068] Step 1: When the density measurement tank 1 is in an empty state, that is, there is no slurry in the density measurement tank 1, read the first tensile force value measured by the tensile force gauge 7. At this time, the hanging weight 6 is only affected by the tensile force of the tensile force gauge 7. The force received by the tensile force gauge 7 is the gravity of the hanging weight 6. After the first tensile force value is converted into mass, it is the mass value m1 of the hanging weight 6, which is 450 kg.

[0069] Step 2: The control system controls the first flow regulating valve 3 and the second flow regulating valve 5. The slurry inlet pipe 2 feeds slurry into the density measurement tank 1, and the slurry outlet pipe 4 discharges slurry. The control system adjusts the opening degrees of the first flow regulating valve 3 and the second flow regulating valve 5 so that the slurry flow rate of the slurry inlet pipe 2 is greater than the slurry flow rate of the slurry outlet pipe 4. At this time, since the slurry inflow volume of the density measurement tank 1 is greater than the outflow volume, the liquid level of the slurry in the density measurement tank 1 gradually rises until it exceeds the top inlet of the overflow pipe 11. At this time, the overflow pipe 11 overflows the slurry, and the slurry liquid level remains stable and no longer rises. At this time, since the density of the hanging weight 6 is greater than the maximum density of the slurry, the hanging weight 6 is completely immersed in the slurry.

[0070] Read the second tensile force value measured by the tensile force gauge 7 at this time, and convert it into a mass value m2.

[0071] Step 3: The control system obtains the density ρ2 of the slurry according to the mass value m1, the mass value m2, and the volume V of the hanging weight 6.

[0072] Specifically:

[0073] ρ2 = (m1 - m2) / V; unit (kg / m 3 )

[0074] After measuring for a set time, close the first flow regulating valve 3, open the valve 13 on the flushing pipe 12, and introduce cleaning water into the slurry inlet pipe 2 through the flushing pipe 12. After the cleaning water enters the density measurement tank 1, it flushes the density measurement tank 1, and the waste water after flushing is discharged through the slurry outlet pipe 4.

[0075] After the flushing is completed, repeat Step 2 - Step 3 to continue measuring the slurry density.

[0076] Flushing the density measurement tank 1 at intervals of a set time can avoid a large amount of fixed deposition of the slurry in the density measurement tank 1, ensuring the accuracy of subsequent measurement results. At the same time, through the setting of the flushing pipe 12, density calibration can also be carried out. During calibration, water is introduced into the density measurement tank 1 using the steps of Step 2 - Step 3, and the control system is adjusted and calibrated according to the density of water to ensure the accuracy of the subsequent calculation results of the control system.

[0077] By using the slurry density measurement device and working method of this embodiment, the advantages and disadvantages of the mass density meter and the differential pressure transmitter are taken into account, and it can be realized through the density measurement tank 1, the plumb bob 6, the tensiometer 7 and the corresponding pipelines and valves. Compared with using a mass type density meter for measurement, the equipment cost is greatly reduced. At the same time, by using this measurement method, compared with a differential pressure type density meter, the data fluctuations caused by the slurry flow are eliminated, and the accuracy of the measurement result is improved, effectively balancing the relationship between the investment cost and the accuracy of the wet flue gas desulfurization slurry density measurement.

[0078] Embodiment 3

[0079] This embodiment provides an absorption tower, which includes a tower body 14. The tower body 14 can adopt the tower body structure of the existing absorption tower. It also includes the slurry density measurement device described in Embodiment 1. The density measurement tank 1 is arranged on one side of the tower body 14. Among them, the inlet of the slurry inlet pipe 2 is connected to the tower body 14 to introduce the slurry in the absorption tower into the density measurement tank 1. The remaining structure of the absorption tower can adopt the existing technology and will not be described in detail here.

[0080] Through the slurry density measurement device, the density of the slurry in the absorption tower can be effectively measured, so as to facilitate the control of the slurry supply amount of the absorption tower.

[0081] Embodiment 4

[0082] This embodiment provides a pulping tank, which includes a tank body. The tank body can adopt the tank body structure of the existing pulping tank. It also includes the slurry density measurement device described in Embodiment 1. The density measurement tank 1 is arranged on one side of the tank body. Among them, the inlet of the slurry inlet pipe 2 is connected to the tank body to introduce the slurry in the pulping tank into the density measurement tank 1. The remaining structure of the pulping tank can adopt the existing technology and will not be described in detail here.

[0083] Through the slurry density measurement device, the density of the slurry in the pulping tank can be effectively measured, so as to facilitate the adjustment of the lime addition amount in the pulping tank and ensure the quality of the slurry.

[0084] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A slurry density measuring device, characterized in that: It includes a density measuring tank, which is connected to one end of a slurry inlet pipe. The other end of the slurry inlet pipe is used to connect to a slurry container. A hanging hammer is arranged inside the density measuring tank. The density of the hanging hammer is greater than the maximum density of the measured slurry. The hanging hammer is connected to the top of the density measuring tank through a tension detection element. The density measuring tank is also connected to an overflow pipe. The outlet end height of the overflow pipe is higher than the height of the top of the hanging hammer.

2. A slurry density measuring device as claimed in claim 1, characterized in that: The slurry inlet pipe is provided with a first flow regulating valve, the bottom of the density measuring tank is an inverted cone structure, the bottom of the inverted cone structure is connected to the slurry outlet pipe, and the slurry outlet pipe is provided with a second flow regulating valve.

3. A slurry density measuring device as claimed in claim 1, characterized in that: The axis of the overflow pipe is parallel to the axis of the density measuring tank, and the axes of the overflow pipe and the density measuring tank are both arranged vertically.

4. A slurry density measuring device as claimed in claim 1, characterized in that: The tension detection element adopts a tension meter, which is connected to the top of the density measuring tank and is connected to the top of the pendulum through a suspension rope.

5. A slurry density measuring device as claimed in claim 1, characterized in that: The density of the pendulum is 1.2 to 1.3 times the maximum density of the slurry being measured.

6. A slurry density measuring device as claimed in claim 1, characterized in that: The hanging hammer adopts a conical structure, and the horizontal cross-sectional area of ​​the hanging hammer gradually increases from top to bottom.

7. A slurry density measuring device as claimed in claim 1, characterized in that: The slurry inlet pipe is also connected to a flushing pipe, and a switch valve is arranged on the flushing pipe.

8. A method for operating the slurry density measuring device according to any one of claims 1 to 7, characterized in that: The following steps are involved: density When the measuring tank is in an empty tank state, the tension value of the tension detection element is read as the first tension value; The slurry inlet pipe introduces slurry into the density measuring tank, and the slurry outlet pipe discharges the slurry in the density measuring tank. The slurry inlet flow rate of the slurry inlet pipe is controlled to be greater than the slurry outlet flow rate of the slurry outlet pipe until the slurry level in the density measuring tank submerges the inlet of the overflow pipe to maintain stability. Reading the tension value of the tension detection element as a second tension value; The density of the measured slurry is obtained through the first tension value, the second tension value and the volume of the pendulum.

9. An absorption tower, comprising a tower body, characterized in that: It also includes the slurry density measuring device according to any one of claims 1 to 7, wherein the slurry inlet pipe is connected to the tower body to guide the slurry in the tower body into the density measuring tank.

10. A pulping tank, comprising a tank body, characterized in that: It also includes the slurry density measuring device according to any one of claims 1 to 7, wherein the slurry inlet pipe is connected to the tank body to guide the slurry in the pulping tank into the density measuring tank.

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