Optimized limestone-gypsum slurry density measurement system
By designing an independently isolated sampling tank and radar level gauge measurement system, the problems of accuracy and sensor wear in limestone-gypsum slurry density measurement were solved, achieving long-term accurate and stable measurement of slurry density with low maintenance costs, and supporting real-time or interval measurement modes.
Patent Information
- Application Number
- CN202422882267.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-11-25
AI Technical Summary
Existing methods for measuring the density of limestone-gypsum slurry suffer from inaccurate measurement accuracy, severe wear of sensing elements, and high maintenance costs, especially when the slurry foams or is stirred, which affects the measurement results.
A limestone-gypsum slurry density measurement system was designed, which includes a sampling tank and a feeding weighing machine. The slurry is sent into the sampling tank by a slurry circulation pump, and the liquid level is measured by a radar level gauge to avoid direct contact between the sensing element and the slurry. The dynamic balance and flushing of the slurry are controlled by an electric valve to achieve independent and isolated sampling.
It achieves long-term accuracy and stability in slurry density measurement, reduces maintenance costs, avoids the impact of slurry disturbance, has no wear on the sensing element, and supports real-time or interval measurement modes, ensuring stable operation of the desulfurization system.
Smart Images
Figure CN223461416U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the limestone -gypsum flue gas desulfurization technical field, more specifically it is an optimized limestone -gypsum slurry density measurement system. BACKGROUND
[0002] Limestone -gypsum wet desulfurization is widely used in large coal-fired power plants because of its high desulfurization efficiency, mature technology, wide range of applicable coal, and abundant source of desulfurizer limestone.
[0003] The measurement methods of limestone -gypsum slurry density can be divided into differential pressure density meter, tuning fork density meter, ultrasonic density meter, and mass flow meter according to different measurement principles.
[0004] Therefore, in order to avoid the influence of slurry bubbles and tower stirring on slurry density measurement, overcome the wear caused by direct contact between slurry and measurement sensor components, and meet the demand for real-time / interval measurement of slurry density, it is necessary to develop an optimized limestone -gypsum slurry density measurement system with high automation, high measurement accuracy, and low maintenance cost. UTILITY MODEL CONTENTS
[0005] The utility model discloses a kind of optimized limestone -gypsum slurry density measurement systems to overcome the deficiencies of the above background art.
[0006] To achieve the above object, the technical scheme of the utility model is as follows: an optimized limestone -gypsum slurry density measurement system includes slurry pool in the bottom of absorption tower, the slurry pool is connected with absorption tower by slurry circulating pipeline, the slurry circulating pipeline is provided with slurry circulating pump, and characterized by further comprising sampling tank and feeding weighing machine.
[0007] The height of the bottom of sampling tank is higher than the highest design liquid level of slurry pool, the liquid inlet at the top of sampling tank is connected with slurry circulating pipeline between slurry circulating pump outlet and absorption tower spray layer by sampling pipeline, and the liquid outlet at the bottom of sampling tank is connected with absorption tower by discharge pipeline.
[0008] The feeding weighing machine is arranged at the side of the bottom of sampling tank.
[0009] In the technical scheme, the discharge pipeline comprises a first discharge pipeline, a hose and a second discharge pipeline, and the liquid outlet is connected with the absorption tower through the first discharge pipeline, the hose and the second discharge pipeline in sequence.
[0010] In the technical scheme, the inlet opening has a larger diameter than the outer diameter of the sampling pipeline, and the discharge pipeline has a larger diameter than the sampling pipeline.
[0011] In the technical scheme, the sampling pipeline extends into the sampling tank through the liquid inlet, and there is a gap between the liquid inlet and the sampling pipeline.
[0012] In the technical scheme, the liquid outlet is a sunken cone.
[0013] In the technical scheme, the sampling tank is provided with a radar liquid level meter at the top.
[0014] In the technical scheme, the sampling pipeline is connected with a flushing water pipeline, and the flushing water pipeline is connected with process water.
[0015] In the technical scheme, the sampling pipeline is provided with a first electric valve, and the first discharge pipeline is provided with a second electric valve.
[0016] In the technical scheme, the flushing water pipeline is provided with a third electric valve.
[0017] Compared with the prior art, the present application has the following advantages:
[0018] 1) The present application effectively reduces the influence of slurry disturbance on measurement accuracy, avoids direct contact between the density measurement related sensing element and the slurry, and realizes long-term accurate and stable operation of slurry density measurement and reduces maintenance cost.
[0019] 2) The liquid inlet of the sampling tank is not fixed to the sampling pipeline, and the liquid outlet of the sampling tank is connected with the absorption tower by a hose, so that the sampling tank is relatively independently isolated and arranged, and the influence of the fixed connection between the traditional sampling tank and the pipeline on the weighing result is avoided.
[0020] 3) The present application samples the slurry from the circulating spray slurry, and the circulating spray slurry is from the slurry in the absorption tower slurry pool, so that the sampled slurry can truly reflect the quality of the slurry in the absorption tower; at the same time, the slurry in the tower is introduced into the sampling tank outside the tower, which overcomes the adverse effects of slurry foaming and stirring on the measurement results.
[0021] 4) By adjusting the opening degree of the first electric valve and the second electric valve, the slurry in the sampling tank can be kept in dynamic balance and continuously updated, and the precipitation of the sampled slurry in the sampling tank is avoided.
[0022] 5) The radar liquid level meter of the utility model is fixedly installed on the top of the sampling tank, has no movable part, has no contact with slurry, has no wear of sensing elements, and has long service life; the electromagnetic wave emitted during measurement is not affected by the gas bubbles of slurry in the sampling tank, is not affected by the physical properties such as density and concentration of slurry in the sampling tank, and has high liquid level measurement precision and good measurement result stability under the condition that the liquid level in the sampling tank is relatively stable.
[0023] 7) The density measurement system of the utility model can realize real-time / interval dual-mode operation according to needs; during real-time measurement, the slurry in the sampling tank continuously flows, and there is no risk of precipitation, so the system can be operated for a long time without needing to be flushed; when the interval measurement mode is selected, the system stops sampling after being operated for a certain time, opens the flushing program, and then samples and measures after flushing is completed; the flushing interval time can be adjusted, and the stable operation of the desulfurization system is not affected; the utility model has high automation degree and low failure rate, and can effectively reduce the maintenance workload and cost.
[0024] 8) The utility model connects the sampling pipeline to the outlet pipeline of the slurry circulating pump, and the slurry in the absorption tower is sequentially sent into the sampling tank through the slurry circulating pump outlet slurry circulating pipeline and the sampling pipeline, without the need of providing additional power.
[0025] 9) The sampling tank of the utility model has simple structure; the liquid inlet has a large opening diameter greater than the outer diameter of the sampling pipeline, so that liquid inlet and tank emptying can be realized at the same time; the liquid outlet is a sinking conical shape, which is beneficial to the discharge of deposited slurry; the diameter of the discharge pipeline is greater than that of the sampling pipeline, so that the sampling tank is ensured to have no risk of overflow, and the overflow pipe is cancelled; the discharge pipeline is connected to the absorption tower, and the design of direct discharge into a ditch is cancelled, so that the waste of slurry and flushing water in the tower is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS
[0026] Figure 1 It is a structural schematic view of the utility model.
[0027] Figure 2 It is a structural schematic view of the sampling tank.
[0028] Among them, 100- absorption tower, 110- slurry pool, 120- slurry circulating pipeline, 130- slurry circulating pump, 140- agitator, 200- sampling tank, 210- liquid inlet, 220- liquid outlet, 300- feed weighing machine, 410- sampling pipeline, 420- discharge pipeline, 421- first discharge pipeline, 422- hose, 423- second discharge pipeline, 430- flushing water pipeline, 500- radar liquid level meter, 610- first electric valve, 620- second electric valve, 630- third electric valve. DETAILED DESCRIPTION
[0029] The embodiments of the present application will be described in detail below with reference to the drawings, but they do not constitute limitations on the present application, and are only examples. Meanwhile, the advantages of the present application will become clearer and easier to understand through the description.
[0030] As shown in the drawings, the optimized limestone-gypsum slurry density measuring system comprises a slurry pool 110 at the bottom of an absorption tower 100, wherein the slurry pool 110 is connected with the absorption tower 100 through a slurry circulating pipeline 120, the slurry circulating pipeline 120 is provided with a slurry circulating pump 130, and further comprises a sampling tank 200 and a feeding weighing machine 300.
[0031] The bottom of the sampling tank 200 is higher than the highest design liquid level of the slurry pool 110, a liquid inlet 210 at the top of the sampling tank 200 is connected with the slurry circulating pipeline 120 between the outlet of the slurry circulating pump 130 and the spraying layer of the absorption tower 100 through a sampling pipeline 410, and a liquid outlet 220 at the bottom of the sampling tank 200 is connected with the absorption tower 100 through a discharge pipeline 420.
[0032] The feeding weighing machine 300 is arranged at the bottom side of the sampling tank 200.
[0033] The discharge pipeline 420 comprises a first discharge pipeline 421, a hose 422 and a second discharge pipeline 423, and the liquid outlet 220 is connected with the absorption tower 100 through the first discharge pipeline 421, the hose 422 and the second discharge pipeline 423 in sequence.
[0034] The opening caliber of the liquid inlet 210 is greater than the outer diameter of the sampling pipeline 410, and the pipe diameter of the discharge pipeline 420 is greater than the pipe diameter of the sampling pipeline 410.
[0035] The sampling pipeline 410 extends into the sampling tank 110 through the liquid inlet 210, and there is a gap between the liquid inlet 210 and the sampling pipeline 410.
[0036] The liquid outlet 220 is a sunken conical shape.
[0037] A radar liquid level meter 500 is arranged at the top of the sampling tank 200.
[0038] The sampling pipeline 410 is connected with a flushing water pipeline 430, and the flushing water pipeline 430 is connected with process water.
[0039] The sampling pipeline 410 is provided with a first electric valve 610, and the first discharge pipeline 421 is provided with a second electric valve 620.
[0040] The flushing water pipeline 430 is provided with a third electric valve 630.
[0041] In actual use, the sampling tank 200 is arranged at a high position to ensure that the bottom of the sampling tank 200 is higher than the highest design liquid level of the slurry pool 110 of the absorption tower 100.
[0042] The liquid inlet 210 at the top of the sampling tank 200 is connected with the slurry circulating pipeline 120 between the outlet of the slurry circulating pump 130 and the spray layer of the absorption tower 100 through the sampling pipeline 410, and the slurry in the absorption tower 100 is sent into the sampling tank 200 by using the outlet pressure of the slurry circulating pump 130, without the need to additionally provide power;
[0043] The opening diameter of the liquid inlet 210 is greater than the outer diameter of the sampling pipeline 410 to ensure that the sampling pipeline 410 is not in contact with the body of the sampling tank 200; the first discharge pipeline 421 and the second discharge pipeline 423 are connected through the hose 422; the relative independent isolation arrangement of the sampling tank 200 is realized, and the accurate measurement of the mass M of the slurry in the sampling tank 200 by the feeding weighing machine 300 is facilitated.
[0044] The liquid inlet 210 and the sampling pipeline 410 have a certain gap, which has a venting function, to ensure that the sampling tank 200 is in a normal pressure state; the liquid outlet 220 is a sunken conical shape, that is, the liquid outlet 220 protrudes downward from the sampling tank 200, and the bottom of the liquid outlet 220 is narrower than the top of the liquid outlet 220, and the liquid outlet 220 is sequentially connected with the absorption tower 100 through the first discharge pipeline 421, the hose 422 and the second discharge pipeline 423, which is conducive to the rapid backflow of the slurry in the sampling tank 200 to the slurry pool 110 in the absorption tower 100 under the negative pressure condition in the absorption tower 100, so as to avoid the deposition of the sampling slurry at the bottom of the sampling tank 200; at the same time, the slurry in the sampling tank 200 directly returns to the slurry pool 110 in the absorption tower 100, which overcomes the waste caused by the direct discharge of the slurry in the sampling tank 200 to the ditch; in order to ensure that there is no risk of overflow of the slurry in the sampling tank, the diameter of the discharge pipeline 420 is greater than the diameter of the sampling pipeline 410.
[0045] A radar liquid level meter 500 is arranged at the top of the sampling tank 200, the antenna of the radar liquid level meter 500 emits electromagnetic waves, which are reflected by the surface of the measured slurry in the sampling tank 200 and then received by the antenna of the radar liquid level meter 500, the height from the antenna of the radar liquid level meter 500 to the surface of the measured slurry in the sampling tank 200 can be calculated by using the time from emission to reception, and then the liquid level height H of the measured slurry in the sampling tank can be calculated according to the distance from the antenna of the radar liquid level meter 500 to the bottom of the sampling tank 200.
[0046] The radar liquid level meter 500 is fixedly installed at the top of the sampling tank 200 and has no movable parts, and is not in contact with the slurry, so there is no wear of the sensing element and the service life is long; the electromagnetic waves emitted during the measurement of the radar liquid level meter 500 are not affected by the gas bubbles in the slurry in the sampling tank 200, and are not affected by the physical properties such as the density and concentration of the slurry in the sampling tank 200, so that the liquid level measurement accuracy is high and the measurement result is stable under the condition that the liquid level in the sampling tank 200 is relatively stable.
[0047] The use method of the utility model, comprising the following steps:
[0048] Step 1: before measurement, ensure that the first electric valve 610, the second electric valve 620 and the third electric valve 630 are in the closed state; the feed weighing machine 300 weighs and calibrates the body of the sampling tank 200, the radar liquid level meter 500, the first discharge pipeline 421 and the third electric valve 630 etc. attached to be 0 kg;
[0049] Step 2: when measuring, first open the first electric valve 610, and the circulating spray slurry flows into the sampling tank 200 through the sampling pipeline 410, and the radar liquid level meter 500 measures the slurry liquid level in the sampling tank 200; when the slurry liquid level gradually rises to the designed highest liquid level of the sampling tank 200, the radar liquid level meter 500 sends a signal to trigger the second electric valve 620 to open completely;
[0050] Step 3: because the diameter of the discharge pipeline 420 is greater than that of the sampling pipeline 410, the slurry discharge amount of the sampling tank 200 is greater than the liquid inlet amount, and the liquid level in the sampling tank 200 begins to drop;
[0051] When the measured liquid level approaches the designed liquid level, the radar liquid level meter 500 sends a signal to adjust the opening of the second electric valve 620; if the liquid level is lower than the designed liquid level, the opening of the second electric valve 620 is further reduced; the liquid inlet amount of the sampling pipeline 410 and the liquid outlet amount of the discharge pipeline 420 tend to be equal, and the slurry liquid level in the sampling tank 200 is maintained near the designed liquid level to maintain dynamic balance;
[0052] Step 4: according to the slurry weight M of the sampling tank 200 measured by the feed weighing machine 300 and the slurry liquid level H measured by the radar liquid level meter 500, the real-time density of the slurry in the sampling tank 200 is calculated and fed back:
[0053] If the sampling tank 200 is circular with a diameter of D, the slurry density calculation formula is:
[0054]
[0055] If the sampling tank 200 is square with a length of L and a width of W, the slurry density calculation formula is:
[0056]
[0057] Step 5: Close the first electric valve 610 to stop sampling, and after the radar liquid level meter 500 detects that the slurry in the sampling tank 200 is completely emptied, the second electric valve 620 is closed; the third electric valve 630 is opened, and the process water is sent into the sampling tank 200 through the flushing water pipeline 430; the radar liquid level meter 500 measures the flushing water level in the sampling tank 200, and when the flushing water level gradually rises to the designed highest liquid level of the sampling tank 200, the radar liquid level meter 500 sends a signal to trigger the third electric valve 630 to be closed and the second electric valve 620 to be completely opened; after the radar liquid level meter 500 detects that the flushing water in the sampling tank 200 is completely emptied, the second electric valve 620 is closed, and the flushing of the sampling tank is completed.
[0058] If the real-time measurement mode is selected, steps 1-4 are continuously performed without step 5; if the interval measurement mode is selected, steps 1-5 are cyclically performed to realize interval measurement and flushing, and the flushing interval operation time can be set according to requirements.
[0059] In summary, the utility model solves the problems of large slurry density measurement error caused by slurry foaming in the absorption tower 100, disturbance of the oxidizing air and the stirrer 140 in the absorption tower 100 to the slurry, and direct contact of the slurry with the density measurement meter sensor, effectively reduces the influence of slurry disturbance on measurement accuracy, avoids direct contact of the density measurement sensor element with the slurry, realizes long-term accurate and stable operation of the slurry density measurement, and reduces the maintenance cost; meanwhile, the utility model meets the requirement of real-time / interval switching measurement of the slurry density.
[0060] Other parts not described belong to the prior art.
Claims
1. An optimized limestone-gypsum slurry density measurement system, comprising a slurry pool (110) at the bottom of an absorption tower (100), the slurry pool (110) being connected to the absorption tower (100) by a slurry circulation pipeline (120), the slurry circulation pipeline (120) being provided with a slurry circulation pump (130), characterized in that: The sampling tank (200) and the feed weighing machine (300) are further included. The sampling tank (200) is arranged at a position higher than the highest design liquid level of the slurry pool (110), and a liquid inlet (210) at the top of the sampling tank (200) is connected with the slurry circulating pipeline (120) between the outlet of the slurry circulating pump (130) and the spray layer of the absorption tower (100) through a sampling pipeline (410), and a liquid outlet (220) at the bottom of the sampling tank (200) is connected with the absorption tower (100) through a discharge pipeline (420). The feed weighing machine (300) is arranged at the side of the bottom of the sampling tank (200).
2. An optimized limestone-gypsum slurry density measurement system as defined in claim 1, wherein: The discharge pipeline (420) comprises a first discharge pipeline (421), a hose (422) and a second discharge pipeline (423), and the liquid outlet (220) is connected with the absorption tower (100) through the first discharge pipeline (421), the hose (422) and the second discharge pipeline (423) in sequence.
3. An optimized limestone-gypsum slurry density measurement system as defined in claim 1, wherein: The opening caliber of the liquid inlet (210) is greater than the outer diameter of the sampling pipeline (410), and the pipe diameter of the discharge pipeline (420) is greater than the pipe diameter of the sampling pipeline (410).
4. An optimized limestone-gypsum slurry density measurement system as defined in claim 3, wherein: The sampling pipeline (410) extends into the sampling tank (200) through the liquid inlet (210), and there is a gap between the liquid inlet (210) and the sampling pipeline (410).
5. An optimized limestone-gypsum slurry density measurement system as defined in claim 2, wherein: The liquid outlet (220) is a sunken cone.
6. An optimized limestone-gypsum slurry density measurement system as defined in claim 1, wherein: A radar liquid level meter (500) is arranged at the top of the sampling tank (200).
7. An optimized limestone-gypsum slurry density measurement system as defined in claim 2, wherein: The sampling pipeline (410) is connected with a flushing water pipeline (430), and the flushing water pipeline (430) is connected with process water.
8. An optimized limestone-gypsum slurry density measurement system as defined in claim 2, wherein: The sampling pipeline (410) is provided with a first electric valve (610), and the first discharge pipeline (421) is provided with a second electric valve (620).
9. An optimized limestone-gypsum slurry density measurement system as defined in claim 7, wherein: The flushing water pipeline (430) is provided with a third electric valve (630).