CN107321168A - A kind of wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system - Google Patents
A kind of wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system Download PDFInfo
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- CN107321168A CN107321168A CN201710704512.XA CN201710704512A CN107321168A CN 107321168 A CN107321168 A CN 107321168A CN 201710704512 A CN201710704512 A CN 201710704512A CN 107321168 A CN107321168 A CN 107321168A
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- Prior art keywords
- pressure
- liquid holdup
- pallet
- circulating pump
- control device
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/346—Controlling the process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
Abstract
The present invention relates to a kind of wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system, including pallet liquid holdup detection means, control device, slurry circulating pump, the liquid holdup detection means includes pressure sensor and is evenly arranged in the pressure sensing port of tray bottom, each pressure sensing port is connected by corresponding pressure measurement pipeline with pressure sensor, and installs magnetic valve on described each pressure measurement pipeline；The magnetic valve controlled connection in control device, control device by the UNICOM of each pressure measurement pipeline of solenoid valve control and pressure sensor whether, selectivity or the pressure for testing corresponding pressure sensing port relative position according to certain rules；The pressure sensor output signal is connected with control device, control device output control signal connection slurry circulating pump.Realize that pallet liquid holdup is controlled in real time by adjusting serum recycle amount, can reduce pallet liquid holdup on the basis of ensureing that sulfur dioxide is up to standard, reduce system pressure losses, play the purpose of energy-conservation.
Description
Technical field
The present invention relates to the control of wet method fume desulfurizing system absorption tower pallet liquid holdup.
Background technology
In the absorption tower of wet desulfurization system, the spray flux and increase flue gas and absorbent drop of desulfurization absorbent are improved
Contact area be improve desulfuration efficiency Main Means.This aspect will by adjust slurry circulating pump flow（Improve liquid gas
Than）And higher nozzle exit pressure drop（Increase spray coverage rate and droplet surface area）Required take off is reached as major parameter
Sulphur efficiency, is imitated it can in addition contain use some to strengthen contact arrangement to improve the contact area of gas and slurries with improving desulfurization
Rate, pallet is exactly the one kind being wherein most widely used.
Pallet provides more effective flue gas and slurry liquid contacts mode than spraying layer.First, the resistance that pallet is produced is caused
Gas flow is evenly distributed in tower section.This resistance formed when gas and slurries rigid connection are touched makes slurries uniform, always
To uptake zone.Therefore, contact of the slurries with flue gas is all optimised in whole absorption region.In the spray void tower of pallet-free, flue gas
By spraying layer rectification, although flue gas can also be redistributed by continuous sprayed slurry resistance in such cases, due to now cigarette
Gas passes through most uptake zone, and this does not just make full use of provided liquid-gas ratio, and unbalanced gas distribution causes absorbing
High or low liquid-gas ratio on tower section, seriously limits overall sulfur dioxide removal efficiency.
Pallet can also play two effects in addition to it can make before spray smoke distribution uniformly：One is gas-liquid shape on pallet
Into bubbling, mass transfer area is expanded, resistance to mass tranfer is reduced, desulphurization reaction is carried out more abundant；Two are easy for overhauling orlop
Spraying layer.Pallet typically uses porous flat plate structure, and material is generally acid-resistant stainless steel, and aperture is generally 25~40mm, perforate
Area is 25%~50%, and sieve plate thickness of slab is usually 3-6mm, divider height about 300mm.For the ease of the processing and maintenance of sieve plate,
Sieve plate uses modularized design in tower.By taking certain power plant 300MW units as an example, desulfurizing tower internal diameter is 12.6m, tower centre sieve plate
By 78 fritters（It is 1.525m × 0.8m per fritter）Composition, each fritter is provided with 450 a diameter of 35mm aperture, and percent opening is
35.5%, it is in equilateral triangle arrangement between adjacent holes.
Patent CN201610516382.2 discloses a kind of folding fan-shaped absorption tower pallet, its roll over sector structure with it is traditional many
Hole plate structure is compared, and has bigger perforated area in identical horizontal projected area, and air resistance is smaller.In addition, perforate
Liquid barrier can prevent the drop converged in tray wall from being fallen along perforate, improve the collection rate of reaction solution.Finally, reaction solution is in great Po
Quick outflow pallet in runner is spent, the problem of effectively alleviating solid deposition and fouling in reaction solution.
Patent of invention CN205235749U provides a kind of novel desulphurization pallet apparatus, including gas cap, pallet, boatswain chair, cone
Cap.Gas cap is fixed on pallet top, and cone cap is fixed on pallet bottom by boatswain chair.Gas cap is hollow cylinder body, internal diameter and pallet
Hole is consistent, a certain size some circular holes is opened on gas cap wall so that the gas through tower tray is dispersed.Pallet is provided with pallet
Hole, aperture is consistent with gas cap hole internal diameter, and gas cap is placed on pallet hole, and the quantity of gas cap is equal with pallet hole number.Boatswain chair is thin
Piece, thickness 2-3mm.It is conical plate to bore cap, is placed at the 10-15cm of pallet bottom, and each cone cap is with 2-4 boatswain chair.The support
Disk greatly improves residence time of the gas in tower, substantially increases the reaction time of sulfur dioxide and slurries, improves gas-liquid
Mass transfer area, improves desulfuration efficiency.
Patent CN205109329U discloses a kind of pallet for reducing the adherent flow phenomenon of flue gas, and the middle local of pallet is opened
Hole, the closed not perforate of edge annular region, the percent opening of local is 0.3-0.5 in the middle of pallet, and the interior edge of its not opening area is arrived
The distance of inner wall of tower is 1%D~5%D, and D is the internal diameter of desulfurizing tower, and the not opening area of pallet is upturned, with perforate local
Between in 120-150 ° of angle；The desulfurizing tower of the pallet of the adherent flow phenomenon of flue gas can be reduced present invention also offers a kind of use,
Pallet is on desulfurizing tower entrance, and under the lowermost layer of spraying layer, demister is provided with the superiors of spraying layer；This hair
It is bright to make velocity of flue gas relative deviation raising more than 10% at spraying layer in tower, effectively reduce flue gas sticking wall flow in desulfurizing tower and show
As with good environmental protection and economy benefit.
Pallet can accumulate some slurries during running on pallet, accumulation slurries number be referred to as the liquid holdup of pallet,
Liquid holdup is more big more is conducive to desulfurization, but liquid holdup is bigger simultaneously, and SR is often also bigger, and system energy consumption is also higher, support
The liquid holdup of disk is also influenceed in addition to being influenceed by itself percent opening by factors such as the gentle liquor ratios of slurries property, namely exhaust gas volumn
Size, flue gas flow field distribution, slurries spray flux, slurries composition, method of operation of slurry circulating pump etc. influence.And slurries quality and
Liquid-gas ratio exactly influences the principal element of desulfuration efficiency, it can be seen that, the number of pallet liquid holdup directly affects desulfurized effect.Cause
This is monitored to pallet liquid holdup to keeping absorption tower desulfurized effect significant in operation.At present it is not yet found that
The monitoring method and device of wet flue gas desulfurization absorption tower pallet liquid holdup.
The content of the invention
The present invention in view of the shortcomings of the prior art, propose a kind of wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system,
The liquid holdup high low signal fed back according to liquid holdup monitoring device controls the rotating speed of frequency conversion slurry circulating pump, is followed by adjusting slurries
Circular rector realizes that pallet liquid holdup is controlled in real time.Pallet liquid holdup, reduction can be reduced on the basis of ensureing that sulfur dioxide is up to standard
System pressure losses, play the purpose of energy-conservation.
The technical solution adopted in the present invention：
A kind of wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system, including pallet liquid holdup detection means, control device
（2）, slurry circulating pump（3）, the liquid holdup detection means include pressure sensor（1）And it is evenly arranged in tray bottom
Pressure sensing port, each pressure sensing port passes through corresponding pressure measurement pipeline and pressure sensor（1）It is connected, and in described each pressure measurement
Magnetic valve is installed on pipeline（4）；The magnetic valve controlled connection is in control device（2）, control device passes through magnetic valve（4）Control
Whether is the UNICOM of each pressure measurement pipeline and pressure sensor, selectivity or to test corresponding pressure sensing port according to certain rules relative
The pressure of position；The pressure sensor output signal and control device（2）Connection, control device output control signal connection slurry
Liquid circulating pump（3）.
Described wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system, each pressure measurement pipeline passes through multiway valve（5）
It is connected with pressure sensor, the monitoring of whole pressure pallet is realized using a pressure sensor, saves the arrangement of sensor
Number, reduces system complexity and reduces investment outlay.
Described wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system, pressure-measuring-point blocking set, and with support
Disk is corresponding；Each pressure measurement pipeline passes through magnetic valve（4）Cut-in pressure measuring point main pipeline, then passes through multiway valve（5）With pressure
Sensor is connected, upper and lower two layers of the interlaced arrangement of pressure-measuring-point main pipeline, to play even gas distribution effect and partly take on support
The function of disk.
At least one use in described wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system, slurry circulating pump
Frequency conversion slurry circulating pump, the frequency conversion slurry circulating pump controlled connection control device, according to holding that liquid holdup monitoring device is fed back
Liquid measure high low signal controls the rotating speed of frequency conversion slurry circulating pump, realizes that pallet liquid holdup is controlled in real time by adjusting serum recycle amount
System.
At least one use in described wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system, slurry circulating pump
Frequency conversion slurry circulating pump, the frequency conversion slurry circulating pump controlled connection control device, according to holding that liquid holdup monitoring device is fed back
Liquid measure high low signal controls the rotating speed of frequency conversion slurry circulating pump, realizes that pallet liquid holdup is controlled in real time by adjusting serum recycle amount
System.
Beneficial effects of the present invention：
1st, wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system of the present invention, simple in construction, reasonable in design, easily realizes.
The liquid holdup high low signal fed back according to liquid holdup monitoring device controls the rotating speed of frequency conversion slurry circulating pump, is followed by adjusting slurries
Circular rector realizes that pallet liquid holdup is controlled in real time, can reduce pallet liquid holdup, reduction on the basis of ensureing that sulfur dioxide is up to standard
System pressure losses, play the purpose of energy-conservation.
2nd, wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system of the present invention, pressure-measuring-point main pipeline is set in interlocking
Put, make the flue gas into pallet uniform, play the effect of gas distribution.In addition, the arrangement of pressure test pipeline can part
Play a part of pallet, contribute to the arrangement number of plies for reducing pallet, while improving desulfuration efficiency, reduce economic input.
It is fume desulfurating absorption tower pallet liquid holdup monitoring system schematic diagram of the present invention to illustrate Fig. 1；
Fig. 2 is fume desulfurating absorption tower pallet liquid holdup monitoring system pressure-measuring-point arrangement schematic diagram of the present invention.
Embodiment
Below by embodiment, technical scheme is described in further detail.
Embodiment 1
Referring to Fig. 1, Fig. 2, wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system of the present invention, including the detection of pallet liquid holdup
Device, control device 2, slurry circulating pump 3, the liquid holdup detection means includes pressure sensor 1 and is evenly arranged in support
The pressure sensing port of tray bottom（Pressure-measuring-point）, each pressure sensing port is connected by corresponding pressure measurement pipeline with pressure sensor 1,
And magnetic valve 4 is installed on described each pressure measurement pipeline；The magnetic valve controlled connection passes through in control device 2, control device 2
Magnetic valve 4 control each pressure measurement pipeline and pressure sensor 1 UNICOM whether, selectivity or test corresponding pressure according to certain rules
The pressure of power detection hole relative position；The output signal of pressure sensor 1 is connected with control device 2, the output control of control device 2 letter
Number connection slurry circulating pump 3.
In Fig. 1, demister, spraying layer and pallet are followed successively by absorption tower from top to bottom.
Embodiment 2
Referring to Fig. 1, Fig. 2, the wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system of the present embodiment, with embodiment 1 not
It is with part：Each pressure measurement pipeline is connected by multiway valve 5 with pressure sensor 1, it is possible to use a pressure sensor reality
The now monitoring of whole pressure pallet, to save the arrangement number of sensor, reduces system complexity and reduces investment outlay.
Embodiment 3
Referring to Fig. 1, Fig. 2, the wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system of the present embodiment, with embodiment 1 or real
The difference for applying example 2 is：Pressure-measuring-point blocking is set, and corresponding with pallet；Each pressure measurement pipeline is connect by magnetic valve 4
Enter pressure-measuring-point main pipeline, be then connected by multiway valve 5 with pressure sensor, the pressure-measuring-point main pipeline upper and lower two
Layer interlaced arrangement, to play even gas distribution effect and partly take on the function of pallet.Referring to Fig. 2, solid line and dotted line be respectively it is upper,
Lower two layers of pressure-measuring-point main pipeline, two upper strata pressure-measuring-point main pipelines（It is shown in solid）Midline position arranged just beneath has lower floor
Pressure-measuring-point main pipeline（Shown in dotted line）.
Embodiment 4
Referring to Fig. 1, Fig. 2, the wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system of the present embodiment, with foregoing embodiments
Difference be：In slurry circulating pump at least one use frequency conversion slurry circulating pump, the frequency conversion slurry circulating pump by
Control connection control device, the liquid holdup high low signal fed back according to liquid holdup monitoring device controls turning for frequency conversion slurry circulating pump
Speed, realizes that pallet liquid holdup is controlled in real time by adjusting serum recycle amount.
Wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system of the present invention, is controlled by pallet liquid holdup, is being ensured
On the basis of sulfur dioxide is up to standard, it is possible to reduce pallet liquid holdup, system pressure losses are reduced, the purpose of energy-conservation is played.Simultaneously
Pressure-measuring-point pipeline interlaced arrangement mode, can make the flue gas into pallet uniform, play the effect of gas distribution.In addition, also
Pallet can partly be played a part of, help to reduce the arrangement number of plies of pallet, while improving desulfuration efficiency, economic throw is reduced
Enter.
Claims (5)
1. a kind of wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system, including pallet liquid holdup detection means, control dress
Put（2）And slurry circulating pump（3）, it is characterised in that：The liquid holdup detection means includes pressure sensor（1）And uniform cloth
The pressure sensing port in tray bottom is put, each pressure sensing port passes through corresponding pressure measurement pipeline and pressure sensor（1）It is connected, and
Magnetic valve is installed on described each pressure measurement pipeline（4）；The magnetic valve controlled connection is in control device（2）, control device lead to
Cross magnetic valve（4）Control each pressure measurement pipeline and pressure sensor UNICOM whether, selectivity or according to certain rules test correspondence
Pressure sensing port relative position pressure；The pressure sensor output signal and control device（2）Connection, control device is defeated
Go out control signal connection slurry circulating pump（3）.
2. wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system according to claim 1, it is characterised in that：It is each to survey
Pressure pipeline passes through multiway valve（5）It is connected with pressure sensor, the prison of whole pressure pallet is realized using a pressure sensor
Survey, to save the arrangement number of sensor, reduce system complexity and reduce investment outlay.
3. wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system according to claim 1 or 2, it is characterised in that：
Pressure-measuring-point blocking is set, and corresponding with pallet；Each pressure measurement pipeline passes through magnetic valve（4）Cut-in pressure measuring point main pipeline,
Then multiway valve is passed through（5）It is connected with pressure sensor, upper and lower two layers of the interlaced arrangement of pressure-measuring-point main pipeline, to rise
The function of pallet is acted on and partly taken on to even gas distribution.
4. wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system according to claim 3, it is characterised in that：Slurries
At least one use frequency conversion slurry circulating pump in circulating pump, the frequency conversion slurry circulating pump controlled connection control device, according to
The liquid holdup high low signal of liquid holdup monitoring device feedback controls the rotating speed of frequency conversion slurry circulating pump, by adjusting serum recycle amount
Realize that pallet liquid holdup is controlled in real time.
5. wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system according to claim 1 or 2, it is characterised in that：
At least one use frequency conversion slurry circulating pump in slurry circulating pump, the frequency conversion slurry circulating pump controlled connection control device,
The liquid holdup high low signal fed back according to liquid holdup monitoring device controls the rotating speed of frequency conversion slurry circulating pump, is followed by adjusting slurries
Circular rector realizes that pallet liquid holdup is controlled in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710704512.XA CN107321168A (en) | 2017-08-17 | 2017-08-17 | A kind of wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system |
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| CN201710704512.XA CN107321168A (en) | 2017-08-17 | 2017-08-17 | A kind of wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system |
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| CN107321168A true CN107321168A (en) | 2017-11-07 |
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| CN201710704512.XA Pending CN107321168A (en) | 2017-08-17 | 2017-08-17 | A kind of wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5461912A (en) * | 1994-06-01 | 1995-10-31 | The Babcock & Wilcox Company | Accurate method of measure tray pressure drop to determine liquid flow in flue gas desulfurization systems |
| JPH0985039A (en) * | 1995-09-26 | 1997-03-31 | Tokyo Electric Power Co Inc:The | Apparatus for treating exhaust gas containing highly concentrated sulfur dioxide gas |
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| CN102580631A (en) * | 2012-03-01 | 2012-07-18 | 王健祥 | Double-circular plate tower |
| CN205981271U (en) * | 2016-01-30 | 2017-02-22 | 武汉大学 | Measurement of intelligence urine and detection device |
| CN207126369U (en) * | 2017-08-17 | 2018-03-23 | 中国大唐集团科学技术研究院有限公司华中分公司 | A kind of wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system |
-
2017
- 2017-08-17 CN CN201710704512.XA patent/CN107321168A/en active Pending
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|---|---|---|---|---|
| US5461912A (en) * | 1994-06-01 | 1995-10-31 | The Babcock & Wilcox Company | Accurate method of measure tray pressure drop to determine liquid flow in flue gas desulfurization systems |
| JPH0985039A (en) * | 1995-09-26 | 1997-03-31 | Tokyo Electric Power Co Inc:The | Apparatus for treating exhaust gas containing highly concentrated sulfur dioxide gas |
| CN101474489A (en) * | 2008-12-25 | 2009-07-08 | 秦松 | Low-resistance column plate with large liquid holdup |
| CN102580631A (en) * | 2012-03-01 | 2012-07-18 | 王健祥 | Double-circular plate tower |
| CN205981271U (en) * | 2016-01-30 | 2017-02-22 | 武汉大学 | Measurement of intelligence urine and detection device |
| CN207126369U (en) * | 2017-08-17 | 2018-03-23 | 中国大唐集团科学技术研究院有限公司华中分公司 | A kind of wet flue gas desulfurization absorption tower pallet liquid holdup monitoring system |
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