CN212007412U - Liquid level measuring system of desulfurization absorption tower - Google Patents
Liquid level measuring system of desulfurization absorption tower Download PDFInfo
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- CN212007412U CN212007412U CN202021151275.2U CN202021151275U CN212007412U CN 212007412 U CN212007412 U CN 212007412U CN 202021151275 U CN202021151275 U CN 202021151275U CN 212007412 U CN212007412 U CN 212007412U
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Abstract
The utility model relates to a wet flue gas desulfurization technical field discloses a liquid level measurement system of desulfurization absorption tower. The utility model comprises a pressure measuring device arranged outside the absorption tower, a flushing system for measuring the cleaning of the pipeline, and a DCS controller; the absorption tower includes the overflow pipeline, the inlet and the absorption tower overflow liquid level parallel and level setting of overflow pipeline, pressure measurement device is including the liquid phase pressure transmitter that is located absorption tower overflow liquid level below and the gaseous phase pressure transmitter that is located overflow liquid level top, liquid phase pressure transmitter includes the first pressure transmitter who arranges in order from bottom to top, second pressure transmitter and third pressure transmitter, rinse-system include respectively with first sampling tube, the second sampling tube, the wash water pipeline that third sampling tube and fourth sampling tube are connected, and set up the solenoid valve on each wash water pipeline respectively. The utility model discloses measure the accuracy good, difficult jam, long service life.
Description
Technical Field
The utility model relates to a wet flue gas desulfurization technical field especially relates to a liquid level measurement system of desulfurization absorption tower.
Background
In the flue gas desulfurization process of a thermal power plant, the liquid level of a desulfurization absorption tower is too high, so that the overflow of the absorption tower is easily increased, and slurry of the absorption tower is easily poured into a flue to damage blades of a draught fan; if the liquid level of the absorption tower is too low, the oxidation reaction space is reduced, and the desulfurization efficiency is reduced.
The liquid level of the desulfurization absorption tower is influenced by a plurality of factors such as limestone slurry supply amount, gypsum slurry discharge amount, demister flushing water, filter liquor water (or process water) entering the absorption tower, flue gas entering amount, moisture contained in flue gas, moisture evaporation in slurry, moisture carried by effluent flue gas and the like, and operating personnel need to adjust an operation mode through the liquid level measurement value of the desulfurization absorption tower to ensure that the liquid level of the desulfurization absorption tower is maintained at a normal liquid level, so that the accurate measurement of the liquid level of the desulfurization absorption tower is of great importance to the safe and stable operation of a desulfurization system.
The more meeting of current power plant's desulfurization absorption tower liquid level adopts the pressure transmitter measurement pressure that the absorption tower bottom set up, and the liquid level of absorption tower is confirmed to the mode that rethread absorption tower thick liquid densimeter measured value was revised. However, in this way, the measurement accuracy of the densimeter has a great relationship with the flow rate and the flow rate of the slurry, and the measurement of the densimeter is distorted along with the deposition in the pipeline; and desulfurization absorption tower bottom thick liquid density is greater than absorption tower upper portion thick liquid density, and the densimeter measuring value can't represent whole desulfurization absorption tower thick liquid density, and is the space that has certain pressure in the whole set of absorption tower thick liquid top that starts back of desulfurization system, has influenced absorption tower bottom pressure transmitter measurement pressure, and then has influenced the calculation of absorption tower liquid level, and the accuracy is poor.
And in some power plants, the liquid level in the tower is measured by a liquid level meter directly, but blockage is easy to occur, and the maintenance cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model provides a measure the liquid level measurement system of good accuracy, difficult jam, long service life's desulfurization absorption tower.
The technical problem to be solved is that: the existing liquid level measuring device has poor measuring accuracy, the measuring deviation is larger and larger along with the prolonging of the service time, the problems of blockage and the like easily occur, and the service life is short.
In order to solve the technical problem, the utility model adopts the following technical scheme:
the utility model discloses a liquid level measuring system of a desulfurization absorption tower, which comprises a pressure measuring device arranged outside the absorption tower, a flushing system for measuring pipeline cleaning and a DCS controller;
the absorption tower comprises an overflow pipeline, and a liquid inlet of the overflow pipeline is arranged flush with the overflow liquid level of the absorption tower;
the pressure measuring device comprises a liquid phase pressure transmitter positioned below the overflow liquid level of the absorption tower and a gas phase pressure transmitter positioned above the overflow liquid level, wherein the liquid phase pressure transmitter comprises a first pressure transmitter, a second pressure transmitter and a third pressure transmitter which are sequentially arranged from bottom to top, the first pressure transmitter, the second pressure transmitter, the third pressure transmitter and the gas phase pressure transmitter are respectively communicated with the inside of the absorption tower through a first sampling pipe, a second sampling pipe, a third sampling pipe and a fourth sampling pipe, a liquid inlet of the third sampling pipe is positioned 1-2m below the overflow liquid level, and a sampling port of the fourth sampling pipe is positioned 0.5-1m above the overflow liquid level;
the flushing system comprises flushing water pipelines respectively connected with the first sampling pipe, the second sampling pipe, the third sampling pipe and the fourth sampling pipe, and electromagnetic valves respectively arranged on the flushing water pipelines. Sampling port of fourth sampling tube
The utility model discloses desulfurization absorption tower's liquid level measurement system, it is further, the absorption tower still includes the end calandria way, the liquid outlet and the end calandria way of overflow pipeline are connected.
The utility model discloses liquid level measurement system of desulfurization absorption tower, it is further, the inlet of first sampling tube is 0.5-1.5m apart from the height in absorption tower bottom.
The utility model discloses liquid level measurement system of desulfurization absorption tower, it is further, the inlet of second sampling tube and the minimum perpendicular distance of adjacent sampling tube are not less than 1 m.
The utility model discloses liquid level measurement system of desulfurization absorption tower, it is further, be provided with manual control valve on first sampling tube, second sampling tube, third sampling tube and the fourth sampling tube respectively.
The utility model discloses the liquid level measurement system of desulfurization absorption tower, it is further, each the delivery port of wash water pipeline and each pressure transmitter and the sampling tube intercommunication between the manual control valve that corresponds.
The utility model discloses the liquid level measurement system of desulfurization absorption tower, it is further, first pressure transmitter, second pressure transmitter, third pressure transmitter and gaseous pressure transmitter's signal output part is connected with the signal input part of DCS controller respectively, and the signal output part of DCS controller is connected with the signal input part of each solenoid valve respectively.
The utility model discloses liquid level measurement system of desulfurization absorption tower compares with prior art, has following beneficial effect:
the utility model discloses liquid level measurement system of desulfurization absorption tower simple structure, it has set up 3 pressure transmitter to arrange in order below the overflow liquid level, the thick liquid pressure and the density of the different positions in layering real time monitoring thick liquid pond, and the different pressure transmitter's of close check position that sets up, can accurately represent bottom precipitation concentration area's thick liquid density after ensureing the measuring result of the first pressure transmitter of bottom calculates, combine together with the second pressure transmitter at middle part and the third pressure transmitter at top, measuring result can accurately reflect the thick liquid density in the whole thick liquid pond, ensure level measurement's accuracy. The third pressure transmitter is arranged 1-2m below the overflow liquid level, so that the density of the slurry with larger upper turbulent flow can be accurately measured, the influence of overflow foam can be avoided to the maximum extent, and the measurement accuracy is improved.
The utility model discloses still set up gas phase pressure transmitter above the overflow liquid level, gas phase pressure transmitter can the accurate pressure of measuring absorption tower liquid level top, and the measuring pressure who reunites first pressure transmitter can overcome the measuring error that absorption tower liquid level top pressure brought for liquid level measurement system. .
The utility model discloses a last sparge water pipeline that has set up respectively of every pressure transmitter, the measurement value who arrives which pressure transmitter when real time monitoring surpasss the warning value, takes place promptly in this sampling tube and blocks up the back, washes this pipeline and pressure transmitter alone, and strong points, the promptness is good, and the jam that has significantly reduced provides the guarantee to measuring the adverse effect that causes, for measuring accuracy.
The liquid level measuring system of the desulfurization absorption tower of the present invention will be further described with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural view of a liquid level measuring system of a desulfurization absorption tower according to the present invention;
reference numerals:
1-an absorption column; 11-an overflow conduit; 12-bottom discharge pipe; 2-a first pressure transmitter; 3-a second pressure transmitter; 4-a third pressure transmitter; 5-gas phase pressure transmitter; 61-a first sampling tube; 62-a second sampling tube; 63-a third sampling tube; 64-a fourth sampling tube; 7-a flushing water pipeline; 8-an electromagnetic valve; 9-manual control valve.
Detailed Description
As shown in figure 1, the utility model discloses desulfurization absorption tower's liquid level measurement system is including setting up the pressure measurement device outside absorption tower 1 for measure the abluent rinse-system of pipeline, and the DCS controller.
Absorption tower 1 includes overflow pipe 11 and end row pipeline 12, and the inlet of overflow pipe 11 sets up with absorption tower 1 overflow liquid level parallel and level, and the liquid outlet is connected with end row pipeline 12.
The pressure measuring device comprises a liquid phase pressure transmitter positioned below the overflow liquid level of the absorption tower 1 and a gas phase pressure transmitter 5 positioned above the overflow liquid level, the liquid phase pressure transmitter comprises a first pressure transmitter 2, a second pressure transmitter 3 and a third pressure transmitter 4 which are sequentially arranged from bottom to top, the first pressure transmitter 2 is communicated with the inside of the absorption tower 1 through a first sampling pipe 61, and the height from the liquid inlet of the first sampling pipe 61 to the bottom of the absorption tower 1 is 0.5-1.5 m; the third pressure transmitter 4 is communicated with the interior of the absorption tower 1 through a third sampling pipe 63, and a liquid inlet of the third sampling pipe 63 is positioned 1-2m below the overflow liquid level; the second pressure transmitter 3 is communicated with the inside of the absorption tower 1 through a second sampling pipe 62, and the minimum vertical distance between the liquid inlet of the second sampling pipe 62 and the adjacent sampling pipe is not less than 1 m.
The gas phase pressure transmitter 5 is communicated with the inside of the absorption tower 1 through a fourth sampling pipe 64, and a sampling port of the fourth sampling pipe 64 is positioned 0.5-1m above the overflow liquid level.
The first sampling pipe 61, the second sampling pipe 62, the third sampling pipe 63 and the fourth sampling pipe 64 are respectively provided with a manual control valve 9, so that a certain pressure transmitter can be manually closed according to production requirements.
The flushing system comprises flushing water pipelines 7 respectively connected with a first sampling pipe 61, a second sampling pipe 62, a third sampling pipe 63 and a fourth sampling pipe 64, and electromagnetic valves 8 respectively arranged on the flushing water pipelines 7, wherein the water outlet of each flushing water pipeline 7 is communicated with the sampling pipe between each pressure transmitter and the corresponding manual control valve 9.
The signal output ends of the first pressure transmitter 2, the second pressure transmitter 3, the third pressure transmitter 4 and the gas phase pressure transmitter 5 are respectively connected with the signal input end of the DCS controller through signal lines, and each pressure transmitter transmits a current signal with the monitored analog quantity of 4-20mA to the DCS controller; the signal output end of the DCS controller is connected with the signal input end of each electromagnetic valve 8 through a signal line respectively, the DCS controller converts the received current signals into pressure signals to carry out monitoring, analysis and judgment, and accordingly the electromagnetic valves 8 on the flushing water pipelines 7 are controlled according to the output signals to flush the sampling pipes.
Use the utility model discloses the method of liquid level measurement system measurement absorption tower 1 liquid level of desulfurization absorption tower, including following step:
step one, the absorption tower 1 carries out normal production work, and the first pressure transmitter 2, the second pressure transmitter 3, the third pressure transmitter 4 and the gas phase pressure transmitter 5 transmit monitored signals to the DCS controller.
Secondly, the DCS controller converts the monitoring signal into a pressure value and determines the liquid level height in the absorption tower 1 at the monitoring moment; the specific determination method comprises the following steps:
selecting a density determination formula according to the monitoring values of the second pressure transmitter 3 and the third pressure transmitter 4, and determining the liquid level height in the absorption tower 1 by using different determination methods according to different pressure conditions; according to the equipment bearing capacity of the absorption tower 1, the monitoring warning value of each pressure transmitter is determined, and in the embodiment, the warning value of each pressure transmitter is determined to be 5 kpa.
When P is present3>At a time of 5kpa of the total weight of the composition,
at this time, the process of the present invention,
in the above formula, P1Monitoring the pressure value in real time for the first pressure transmitter 2;
P2monitoring the pressure value in real time for the second pressure transmitter 3;
P3monitoring the pressure value in real time for the third pressure transmitter 4;
P4monitoring the pressure value of the gas phase pressure transmitter 5 in real time;
H0is the vertical distance between the liquid inlet of a first sampling pipe 61 connected with the first pressure transmitter 2 and the bottom of the absorption tower 1;
H2is a vertical distance between the liquid inlets of the first sampling pipe 61 and the third sampling pipe 63;
h is the real-time liquid level height in the absorption tower 1;
ρ2calculating the density of the slurry in the absorption tower 1 between the first sampling pipe 61 and the third sampling pipe 63;
rho is the density of the slurry in the whole absorption tower 1;
when P is present3<5kpa and P2>At a time of 5kpa of the total weight of the composition,
at this time, the process of the present invention,
in the above formula, ρ1Calculating the density of the slurry in the absorption tower 1 between the first sampling pipe 61 and the second sampling pipe 62;
H1is a vertical distance from the liquid inlet of the first sampling pipe 61 and the second sampling pipe 62;
when P is present2<When the pressure is 5kpa, the liquid level of the absorption tower 1 is half of the operating liquid level at the moment, the slurry is in a slurry emptying stage, and the DCS controller keeps the density of the absorption tower 1 unchanged at the previous moment;
at this time, the process of the present invention,
step three, when the density of the slurry reaches an alarm value or the real-time measurement value of each pressure transmitter reaches the alarm value, the DCS controller opens the electromagnetic valve 8 to flush the sampling tube and the pressure transmitter;
in this embodiment, when the DCS controller determines the density, the warning value of the density is set to be 1000kg/m3～1250kg/m3And if the density of the absorption tower 1 is kept unchanged in the previous moment by the DCS controller after the density of the absorption tower exceeds the warning value, automatically starting a pressure transmitter flushing program, and simultaneously starting the electromagnetic valves 8 on the flushing water pipelines 7 to flush the sampling pipes and the pressure transmitter.
When pressure transmitter's real-time supervision numerical value sudden change exceeded 5kpa per second to when keeping this numerical value time delay 5s, judge that this pressure transmitter appears the jam phenomenon, the solenoid valve 8 on this flushing water pipeline 7 is opened to the DCS controller, washes this pressure transmitter and sampling tube, and specific washing procedure is as follows:
a, selecting a numerical value before liquid level mutation of a desulfurization absorption tower 1 as a current liquid level calculation value by a DCS controller, and keeping the numerical value unchanged;
B. judging the pressure transmitter with abnormal measurement parameters;
c, opening the electromagnetic valve 8 corresponding to the abnormal pressure transmitter by the DCS controller, washing the sampling tube and the pressure transmitter, and delaying for 20 seconds;
D. closing the electromagnetic valve 8;
and E, recovering the liquid level of the DCS controller to be calculated normally.
The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
Claims (7)
1. Desulfurization absorption tower's liquid level measurement system, its characterized in that: the device comprises a pressure measuring device arranged outside an absorption tower (1), a flushing system used for measuring pipeline cleaning, and a DCS controller;
the absorption tower (1) comprises an overflow pipeline (11), and a liquid inlet of the overflow pipeline (11) is arranged in parallel with the overflow liquid level of the absorption tower (1);
the pressure measuring device comprises a liquid phase pressure transmitter and a gas phase pressure transmitter, wherein the liquid phase pressure transmitter is positioned below the overflow liquid level of the absorption tower (1), the gas phase pressure transmitter (5) is positioned above the overflow liquid level, the liquid phase pressure transmitter comprises a first pressure transmitter (2), a second pressure transmitter (3) and a third pressure transmitter (4) which are sequentially arranged from bottom to top, the first pressure transmitter (2), the second pressure transmitter (3), the third pressure transmitter (4) and the gas phase pressure transmitter (5) are respectively communicated with the inside of the absorption tower (1) through a first sampling pipe (61), a second sampling pipe (62), a third sampling pipe (63) and a fourth sampling pipe (64), a liquid inlet of the third sampling pipe (63) is positioned 1-2m below the overflow liquid level, and a sampling port of the fourth sampling pipe (64) is positioned 0.5-1m above the overflow liquid level;
the flushing system comprises a flushing water pipeline (7) which is respectively connected with a first sampling pipe (61), a second sampling pipe (62), a third sampling pipe (63) and a fourth sampling pipe (64), and electromagnetic valves (8) which are respectively arranged on the flushing water pipeline (7).
2. The liquid level measuring system of the desulfurization absorption tower according to claim 1, wherein: the absorption tower (1) further comprises a bottom discharge pipeline (12), and a liquid outlet of the overflow pipeline (11) is connected with the bottom discharge pipeline (12).
3. The liquid level measuring system of the desulfurization absorption tower according to claim 1, wherein: the liquid inlet of the first sampling pipe (61) is 0.5-1.5m away from the bottom of the absorption tower (1).
4. The liquid level measuring system of the desulfurization absorption tower according to claim 3, wherein: the minimum vertical distance between the liquid inlet of the second sampling tube (62) and the adjacent sampling tube is not less than 1 m.
5. The liquid level measuring system of the desulfurization absorption tower according to claim 1, wherein: and the first sampling pipe (61), the second sampling pipe (62), the third sampling pipe (63) and the fourth sampling pipe (64) are respectively provided with a manual control valve (9).
6. The liquid level measuring system of the desulfurization absorption tower according to claim 5, wherein: the water outlet of each flushing water pipeline (7) is communicated with a sampling pipe between each pressure transmitter and the corresponding manual control valve (9).
7. The liquid level measuring system of the desulfurization absorption tower according to claim 1, wherein: the signal output ends of the first pressure transmitter (2), the second pressure transmitter (3), the third pressure transmitter (4) and the gas phase pressure transmitter (5) are respectively connected with the signal input end of the DCS controller, and the signal output end of the DCS controller is respectively connected with the signal input end of each electromagnetic valve (8).
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Cited By (3)
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| CN113150839A (en) * | 2021-03-30 | 2021-07-23 | 中冶焦耐(大连)工程技术有限公司 | Automatic system of reviving of accurate measurement of coking crude benzol unit wash oil regenerator liquid level |
| CN113571215A (en) * | 2021-06-30 | 2021-10-29 | 中国核电工程有限公司 | Heat exchange water tank liquid level measurement system and method and nuclear power plant PCS system |
| CN114111955A (en) * | 2021-12-09 | 2022-03-01 | 辽宁毕托巴科技股份有限公司 | Metering device for volume and mass of oil in transportation oil tank |
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- 2020-06-19 CN CN202021151275.2U patent/CN212007412U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113150839A (en) * | 2021-03-30 | 2021-07-23 | 中冶焦耐(大连)工程技术有限公司 | Automatic system of reviving of accurate measurement of coking crude benzol unit wash oil regenerator liquid level |
| CN113571215A (en) * | 2021-06-30 | 2021-10-29 | 中国核电工程有限公司 | Heat exchange water tank liquid level measurement system and method and nuclear power plant PCS system |
| WO2023273250A1 (en) * | 2021-06-30 | 2023-01-05 | 中国核电工程有限公司 | Heat exchange water tank liquid level measurement system and method, and nuclear power plant pcs |
| CN114111955A (en) * | 2021-12-09 | 2022-03-01 | 辽宁毕托巴科技股份有限公司 | Metering device for volume and mass of oil in transportation oil tank |
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Address after: 100039 room 901, 9 / F, building 1, yard 16, West Fourth Ring Middle Road, Haidian District, Beijing Patentee after: Guoneng Longyuan environmental protection Co.,Ltd. Address before: 100039 room 911, 1 building, 16 West Fourth Ring Road, Haidian District, Beijing. Patentee before: BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENGINEERING Co.,Ltd. |
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