CN111678840A - Device and method for measuring density of desulfurization absorption tower of power plant - Google Patents
Device and method for measuring density of desulfurization absorption tower of power plant Download PDFInfo
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- CN111678840A CN111678840A CN202010459346.3A CN202010459346A CN111678840A CN 111678840 A CN111678840 A CN 111678840A CN 202010459346 A CN202010459346 A CN 202010459346A CN 111678840 A CN111678840 A CN 111678840A
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 46
- 230000023556 desulfurization Effects 0.000 title claims abstract description 46
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 90
- 239000002002 slurry Substances 0.000 claims abstract description 36
- 238000005259 measurement Methods 0.000 claims abstract description 19
- 238000000926 separation method Methods 0.000 claims abstract description 11
- 238000001739 density measurement Methods 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 10
- 238000011010 flushing procedure Methods 0.000 claims description 9
- 230000003749 cleanliness Effects 0.000 claims description 5
- 239000007791 liquid phase Substances 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 claims description 3
- 239000011268 mixed slurry Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/26—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention discloses a device and a method for measuring the density of a power plant desulfurization absorption tower, which comprises a gas-liquid separator connected with the power plant desulfurization absorption tower through a pipeline, a density tank communicated with the bottom of the gas-liquid separator through a pipeline, a pressure transmitter arranged in the density tank, and an overflow port arranged at the top of the density tank; the density tank is communicated with the gas-liquid separator at the bottom of the density tank, and the gas-liquid separator is communicated with the power plant desulfurization absorption tower at the top of the density tank. The invention leads out the slurry in the desulfurization absorption tower for measurement, and carries out gas-liquid separation on the slurry, thereby reducing the influence of bubbles on the measurement of the density of the slurry, simultaneously, the pressure transmitter immersed in the slurry avoids the influence of high flow velocity on measurement data, and improves the accuracy of the measurement of the slurry in the desulfurization absorption tower.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a device and a method for measuring the density of a desulfurization absorption tower of a power plant.
Background
The density value of the slurry of the absorption tower of the power plant desulfurization system is an important parameter for controlling the desulfurization effect, and a plurality of measurement methods are available for the density measurement mode of the absorption tower in the power plant desulfurization system, but the density measurement value has some deviation due to various reasons on site, and problems exist in use and maintenance.
Most of conventional density measurement adopts differential pressure measurement of an absorption tower, and the measurement mode can be influenced by bubbles in slurry to cause deviation of density values; the other measurement mode is that a path is led out from the pipeline, and the measurement is carried out on the pipeline according to a densimeter, the measurement precision of the measurement mode is accurate, but the flow speed in the pipeline is high, the abrasion of the instrument is serious, and the later operation and maintenance cost is high.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the density measurement device and the density measurement method for the power plant desulfurization absorption tower are provided, the density measurement of slurry in the desulfurization tower is realized, the accuracy of the density measurement is improved, and the efficient operation of a desulfurization system is ensured.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the device for measuring the density of the desulfurization absorption tower of the power plant comprises a gas-liquid separator connected with the desulfurization absorption tower of the power plant through a pipeline, a density tank communicated with the bottom of the gas-liquid separator through a pipeline, a pressure transmitter arranged in the density tank and an overflow port arranged at the top of the density tank; the density tank is communicated with the gas-liquid separator at the bottom of the density tank, and the gas-liquid separator is communicated with the power plant desulfurization absorption tower at the top of the density tank.
Further, the pressure transmitter is provided in a plurality of numbers and is located at different height positions in the density tank.
Furthermore, the overflow port is provided with an overflow pipeline, and the bottom of the density tank is provided with an emptying pipeline.
Furthermore, a back flush pipeline is arranged at the bottom of the gas-liquid separator, is communicated with the emptying pipeline and is provided with a corresponding control valve.
The invention provides a method for measuring the density of slurry in a desulfurization absorption tower by using the measuring device, which is characterized by comprising the following steps: comprises the following steps;
s1: connecting the measuring device with a desulfurization absorption tower through a pipeline;
s2: opening a control valve on a pipeline communicated with the gas-liquid separator and the desulfurization absorption tower, so that a gas-liquid mixture in the desulfurization absorption tower enters gas-liquid separation from the top of the gas-liquid separator for gas-liquid separation;
s3: the liquid phase separated by the gas-liquid separator enters a density tank, so that the density tank is filled with liquid and the liquid flows out from a pipeline of an overflow port;
s4: when liquid flows out of the liquid flow pipeline, reading the numerical value of the pressure transmitter, and calculating the density value of the liquid according to the numerical value of the pressure transmitter;
s5: after the density test is finished, draining the slurry in the gas-liquid separator and the density tank;
s6: and opening a control valve of a back flushing pipeline, and back flushing the gas-liquid separator and the density tank which are used for draining the slurry, so as to ensure the cleanliness of the gas-liquid separator and the density tank for the next density measurement.
Further, before the operation of step S2 is performed, the backwash line control valve is first opened to flush the gas-liquid separator and the density tank, thereby ensuring the cleanliness of the gas-liquid separator and the density tank.
Further, when there are a plurality of pressure transmitters in step S4, the corresponding density values are calculated according to the measured values of each pressure transmitter, if the calculated density value difference exceeds 5%, the steps S2 to S4 need to be repeated to perform re-measurement, and if the density values do not differ by more than 5%, the average value is taken as the measured value of the liquid density.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention can greatly reduce the bubbles in the slurry and deposit the bubbles at the bottom of the gas-liquid separator after the separation by enterprises of the gas-liquid separator, lead the slurry at the bottom to the density tank through a pipeline and fill the density tank, and measure the pressure in the slurry through the pressure transmitter arranged in the density tank, and measure the density value of the slurry through the depth of the pressure transmitter in the density tank, thereby greatly reducing the influence of the bubbles on the measured value of the density of the slurry, eliminating the measurement influence of high flow speed in a pipeline on a density meter and improving the accuracy of the measurement of the density of the slurry in the desulfurization absorption tower in the whole process, and data guarantee is provided for the normal operation of the desulfurization absorption tower of the power plant.
(2) The pressure transmitters are arranged at different heights, and the pressure values of the slurry are calculated through the average value, so that the influence caused by measurement errors is effectively avoided, and the accuracy of slurry density measurement is further improved.
(3) The back-flushing pipeline is arranged in the density testing device, so that impurities in the gas-liquid separator and the density tank can be cleaned, the purity of slurry is ensured, and the accuracy of the density test is further ensured.
Drawings
FIG. 1 is a schematic view of a measuring apparatus according to the present invention.
Wherein, the names corresponding to the reference numbers are:
1-a gas-liquid separator, 2-a density tank, 3-a pressure transmitter, 4-an overflow port, 5-an overflow pipeline, 6-an emptying pipeline, 7-a backwashing pipeline and 10-a power plant desulfurization absorption tower.
Detailed Description
The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.
As shown in fig. 1:
the density measuring device of the desulfurization absorption tower of the power plant is used for measuring the slurry in the desulfurization absorption tower by leading out the slurry and carrying out gas-liquid separation on the slurry, so that the influence of bubbles on the measurement of the slurry density is reduced, and the accuracy of the measurement of the slurry in the desulfurization absorption tower is improved. The specific measuring device comprises a gas-liquid separator 1, a density tank 2, a pressure transmitter 3 and an overflow port 4, wherein the pressure transmitter 3 and the overflow port 4 are arranged in the density tank, the gas-liquid separator 1 is communicated with a desulfurization absorption tower 10 of a power plant through a pipeline, slurry enters from the top of the gas-liquid separator during communication, the gas-liquid separator 1 is also communicated with the density tank 2 through a pipeline, and the pipeline is led from the bottom of the gas-liquid separator and is communicated with the bottom of the density tank during communication, so that the slurry at the bottom of the gas-liquid separator enters the density tank from the bottom of the density tank, the density tank is provided with the overflow port 4, the overflow pipeline 5 is arranged on the overflow port 4, and the slurry overflowing from the overflow port is discharged through the; the pressure transmitter 3 is positioned in the density tank and is separated from the bottom of the density tank by a certain distance, so that the influence of the sediment of the density tank on the pressure intensity test of the pressure transmitter is avoided; meanwhile, in order to avoid errors caused by single measurement, the pressure transmitters 3 are arranged in a plurality of positions which are respectively positioned at different heights in the density tank.
In order to realize the flushing of the gas-liquid separator and the density tank and the discharge of liquid, a back flush pipeline 7 is arranged at the bottom of the atmosphere separator, an emptying pipeline 6 is arranged at the bottom of the density tank 1, the back flush pipeline 7 is communicated with the emptying pipeline 6, a corresponding control valve is arranged, the back flush pipeline is communicated with a water supply pipeline, the back flush of the gas-liquid separator and the density tank is realized through water of the water supply pipeline, the cleanness of the gas-liquid separator and the density tank is ensured, the influence of impurities on measurement data is eliminated, and the test accuracy is improved. Meanwhile, in order to realize the automatic control of the device system, each control valve can be set into an electromagnetic valve and is connected through an intelligent chip (such as a single chip microcomputer) or a PLC control system, so that the automatic on-off of the control valves is realized, and the operation of the device system is controlled.
The density test by adopting the measuring device of the invention comprises the following specific processes:
s1: the measuring device is connected with the desulfurization absorption tower through a pipeline.
S2: opening a control valve on a pipeline communicated with the gas-liquid separator and the desulfurization absorption tower, so that a gas-liquid mixture in the desulfurization absorption tower enters gas-liquid separation from the top of the gas-liquid separator for gas-liquid separation; in order to ensure the cleanness of the gas-liquid separator and the density tank and the accuracy of the test, before the test, the back flushing pipeline control valve is firstly opened to flush the gas-liquid separator and the density tank, so that the cleanness of the gas-liquid separator and the density tank is ensured.
S3: after the gas-liquid separator and the density tank are washed and cleaned, the cleaning water in the gas-liquid separator and the density tank is drained and drained, then a control valve on a pipeline for communicating the desulfurization absorption tower and the gas-liquid separator is opened, so that a gas-liquid mixture in the desulfurization absorption tower enters the gas-liquid separation from the top of the gas-liquid separator, a liquid phase after the gas-liquid separation of the gas-liquid separator enters the density tank, the density tank is filled with the liquid, and the liquid flows out from the pipeline of an overflow port.
S4: when liquid flows out of the liquid flow pipeline, the control valve can be closed at the moment, so that the control valve is disconnected with the desulfurization absorption tower system, and the liquid is not fed into the densifier; the desulfurization absorption tower system can be continuously connected with the density tank, the slurry is continuously conveyed into the density tank, and simultaneously the slurry flows out from the overflow port through the overflow pipeline, so that the diameter of the liquid inlet of the density tank is required to be smaller than the size of the overflow port, and the slurry obtained in the density tank is always kept at the height position of the overflow port; reading the value of the pressure transmitter, and calculating the density value of the liquid according to the value of the pressure transmitter; the specific calculation can be represented by the formula: and P/gh, wherein P is the density value, P is the pressure intensity measured by the pressure transmitter, h is the height difference between the position of the pressure transmitter and the overflow port, and g is the gravity acceleration.
When a plurality of pressure transmitters are provided, corresponding density values are calculated according to the measured values of each pressure transmitter, if the calculated density value difference exceeds 5%, the steps S2-S4 are repeated for re-measurement, and if the density values do not exceed 5%, the average value is taken as the measured value of the liquid density.
S5: after the density test is finished, draining the slurry in the gas-liquid separator and the density tank;
s6: and opening a control valve of a back-flushing pipeline, back-flushing the gas-liquid separator and the density tank which are used for draining the slurry, and performing parallel cleaning and drying control to ensure the cleanliness of the density tank for the next density measurement.
The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the insubstantial modifications or changes made within the spirit and scope of the main design of the present invention, which still solve the technical problems consistent with the present invention, should be included in the scope of the present invention.
Claims (7)
1. Power plant's desulfurization absorption tower density measurement device which characterized in that: the device comprises a gas-liquid separator (1) connected with a desulfurization absorption tower (10) of a power plant through a pipeline, a density tank (2) communicated with the bottom of the gas-liquid separator (1) through a pipeline, a pressure transmitter (3) arranged in the density tank (2), and an overflow port (4) arranged at the top of the density tank (2); the density tank (2) is communicated with the gas-liquid separator (1) at the bottom of the density tank, and the gas-liquid separator (1) is communicated with the power plant desulfurization absorption tower (10) at the top of the density tank.
2. The power plant desulfurization absorption tower density measurement device of claim 1, characterized in that: the pressure transmitters (3) are arranged in a plurality of positions and are located at different height positions in the density tank (2).
3. The power plant desulfurization absorption tower density measurement device of claim 2, characterized in that: the overflow port (4) is provided with an overflow pipeline (5), and the bottom of the density tank (2) is provided with an emptying pipeline (6).
4. The power plant desulfurization absorption tower density measurement device of claim 3, characterized in that: a back flush pipeline (7) is arranged at the bottom of the gas-liquid separator (1), the back flush pipeline (7) is communicated with the emptying pipeline (6), and a corresponding control valve is arranged.
5. The method for measuring the density of the slurry in the desulfurization absorption tower of the power plant by using the density measuring device of the desulfurization absorption tower of the power plant as claimed in claims 1 to 4 is characterized in that: comprises the following steps;
s1: connecting the measuring device with a desulfurization absorption tower through a pipeline;
s2: opening a control valve on a pipeline communicated with the gas-liquid separator and the desulfurization absorption tower to enable gas-liquid mixed slurry in the desulfurization absorption tower to enter gas-liquid separation from the top of the gas-liquid separator for gas-liquid separation;
s3: the liquid phase separated by the gas-liquid separator enters a density tank, so that the density tank is filled with liquid and the liquid flows out from a pipeline of an overflow port;
s4: when liquid flows out of the liquid flow pipeline, reading the numerical value of the pressure transmitter, and calculating the density value of the liquid according to the numerical value of the pressure transmitter;
s5: after the density test is finished, draining the slurry in the gas-liquid separator and the density tank;
s6: and opening a control valve of a back flushing pipeline, and back flushing the gas-liquid separator and the density tank which are used for draining the slurry, so as to ensure the cleanliness of the gas-liquid separator and the density tank for the next density measurement.
6. The measurement method according to claim 5, characterized in that: in the process of step S2, the backwash line control valve is opened to flush the gas-liquid separator and the density tank, and the cleanliness of the gas-liquid separator and the density tank is ensured.
7. The measurement method according to claim 5 or 6, characterized in that: when there are a plurality of pressure transmitters in step S4, calculating corresponding density values according to the measured values of each pressure transmitter, if the calculated density value difference exceeds 5%, repeating steps S2-S4 to perform re-measurement, and if the density value difference does not exceed 5%, taking an average value as the measured value of the liquid density.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010459346.3A CN111678840A (en) | 2020-05-27 | 2020-05-27 | Device and method for measuring density of desulfurization absorption tower of power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010459346.3A CN111678840A (en) | 2020-05-27 | 2020-05-27 | Device and method for measuring density of desulfurization absorption tower of power plant |
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| CN111678840A true CN111678840A (en) | 2020-09-18 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203965273U (en) * | 2014-05-14 | 2014-11-26 | 武汉龙净环保工程有限公司 | Slurry density of desulfurizing absorption column measurement mechanism |
| CN204203031U (en) * | 2014-11-10 | 2015-03-11 | 广东粤电云河发电有限公司 | A kind of absorption tower slurry density measurement device |
| CN208287873U (en) * | 2018-03-27 | 2018-12-28 | 湖北弈徽能源科技有限公司 | A kind of differential pressure type lime stone slurry preparing tank |
| CN209296056U (en) * | 2019-02-14 | 2019-08-23 | 湖北三宁化工股份有限公司 | One kind is for measuring liquid level of slurry, density, apparatus for measuring concentration |
| CN111175182A (en) * | 2020-01-08 | 2020-05-19 | 华电内蒙古能源有限公司包头发电分公司 | Method for measuring density of desulfurized limestone slurry of thermal power plant |
-
2020
- 2020-05-27 CN CN202010459346.3A patent/CN111678840A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203965273U (en) * | 2014-05-14 | 2014-11-26 | 武汉龙净环保工程有限公司 | Slurry density of desulfurizing absorption column measurement mechanism |
| CN204203031U (en) * | 2014-11-10 | 2015-03-11 | 广东粤电云河发电有限公司 | A kind of absorption tower slurry density measurement device |
| CN208287873U (en) * | 2018-03-27 | 2018-12-28 | 湖北弈徽能源科技有限公司 | A kind of differential pressure type lime stone slurry preparing tank |
| CN209296056U (en) * | 2019-02-14 | 2019-08-23 | 湖北三宁化工股份有限公司 | One kind is for measuring liquid level of slurry, density, apparatus for measuring concentration |
| CN111175182A (en) * | 2020-01-08 | 2020-05-19 | 华电内蒙古能源有限公司包头发电分公司 | Method for measuring density of desulfurized limestone slurry of thermal power plant |
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Application publication date: 20200918 |
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