CN113082855A - Baffle plate demister and working method thereof - Google Patents
Baffle plate demister and working method thereof Download PDFInfo
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- CN113082855A CN113082855A CN202110301359.2A CN202110301359A CN113082855A CN 113082855 A CN113082855 A CN 113082855A CN 202110301359 A CN202110301359 A CN 202110301359A CN 113082855 A CN113082855 A CN 113082855A
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- flue gas
- gas channel
- baffle plate
- channel unit
- deflected
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
- B01D45/06—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by reversal of direction of flow
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Abstract
The invention discloses a baffle plate demister and a working method thereof, wherein the demister comprises a demister body, a flue gas inlet is arranged at the bottom end of the demister body, flue gas enters a flue gas channel in the demister body through the flue gas inlet, a baffle plate is arranged in the flue gas channel, and the flue gas channel comprises: the diameter of the gas collection opening is smaller than that of the flue gas inlet, the bottom end of the gas collection opening is connected with the flue gas inlet, the upper end of the gas collection opening is divided into two baffling flue gas channel units, the two baffling flue gas channel units are respectively arranged adjacent to two baffle plates in the flue gas channel, and the shape of the longitudinal section of each baffling flue gas channel unit is the same as that of each baffle plate; the folded plate on one side of the deflection flue gas channel unit, which is close to the deflection plate, is provided with a horn-shaped flue gas discharge port which leads the flue gas to be sprayed onto the deflection plate in an accelerating way. The baffle plate demister can increase the probability of the baffle plate for catching liquid drops in flue gas and improve demisting efficiency.
Description
Technical Field
The invention relates to a demisting device, in particular to a baffle plate demister and a working method thereof.
Background
The baffling board defroster is the most extensive one kind defroster of using in current desulfurization system, but the defogging efficiency of this type of defroster still remains to promote on the current market, and one of its leading reasons is that the inside catching efficiency to liquid drop in the flue gas of defroster is not high.
A defroster and wet flue gas desulfurization tower patent number CN202010845929.X for wet flue gas desulfurization tower of prior art patent now, wherein just improved the seizure of defogging in-process liquid drop, for example reform transform traditional baffling board, improve to neotype convex structure to make defogging efficiency promote 96.5% from 85%. Although the method can improve the capturing effect of the liquid drops to a certain extent, specific research lacks theoretical support, and the modification of the traditional baffle plate is relatively complex.
Disclosure of Invention
Aiming at the technical problems, the invention provides the baffle plate demister and the working method thereof by analyzing the internal flow field of the existing baffle plate demister through professional simulation software Fluent.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the utility model provides a baffling board defroster, includes the defroster body, the bottom of defroster body is equipped with the flue gas entry, and the flue gas warp the inside flue gas passageway of defroster body is got into to the flue gas entry, the inside baffling board that is equipped with of flue gas passageway, the flue gas passageway includes:
the diameter of the gas collection port is smaller than that of the flue gas inlet, the bottom end of the gas collection port is connected with the flue gas inlet, the upper end of the gas collection port is divided into two baffling flue gas channel units, namely a first baffling flue gas channel unit and a second baffling flue gas channel unit, wherein the first baffling flue gas channel unit is arranged close to a first baffling plate positioned on the left side of the flue gas channel, and the shape of the longitudinal section of the first baffling flue gas channel unit is the same as that of the longitudinal section of the first baffling plate;
the second baffling smoke channel unit is arranged close to a second baffling plate positioned on the right side of the smoke channel, and the shape of the longitudinal section of the second baffling smoke channel unit is the same as that of the longitudinal section of the second baffling plate;
the first baffling flue gas channel unit is formed by arranging two folded plates with the same shape in parallel, and a first horn-shaped flue gas discharge port which enables flue gas to be sprayed onto the first folded plate in an accelerated manner is formed in the folded plate, which is close to one side of the first folded plate, on the first baffling flue gas channel unit;
the second baffling flue gas channel unit is formed by parallelly arranging two folded plates with the same shape, and a second horn-shaped flue gas discharge port for accelerating the flue gas to be sprayed onto the second baffling plate is formed in the folded plate close to one side of the second baffling plate on the second baffling flue gas channel unit.
A plurality of first horn-shaped smoke discharge ports are formed in a folded plate on one side, close to the first folding plate, of the first folding smoke channel unit, and the first horn-shaped smoke discharge ports are uniformly arranged on the folded plate at intervals;
a plurality of second horn-shaped flue gas discharge ports are formed in the folded plate, close to one side of the second baffle plate, on the second baffled flue gas channel unit, and the second horn-shaped flue gas discharge ports are evenly arranged on the folded plate at intervals.
And a round wire mesh is arranged at one end of each trumpet-shaped smoke discharge port with a large aperture.
The inner wall of the baffling flue gas channel unit and one side of the baffle plate, which is in contact with flue gas, are coated with PTFE coatings.
And a waste liquid collecting tank is arranged at the bottom of one side, which is positioned on the baffle plate and contacts with the flue gas, in the flue gas channel, and the bottom of the waste liquid collecting tank is connected with a waste liquid collecting pipe.
The waste liquid collecting groove is an arc-shaped groove.
The invention further discloses a working method based on the baffle plate demister, when the demister works, flue gas flows through a flue gas inlet from multiple directions at a high speed, and enters the series-parallel flue gas discharge device in a series-connection mode through a gas collecting port, and due to the design of the series-parallel flue gas discharge device, the flow space of the flue gas is greatly reduced, so that a large amount of flue gas is concentrated at the gas collecting port, and then the flue gas rapidly enters the first baffling flue gas channel unit and the second baffling flue gas channel unit from the left side and the right side of the gas collecting port respectively in a parallel shunting mode;
when the flue gas flows through the tubaeform flue gas discharge port on the baffling flue gas passageway unit, a large amount of flue gases are discharged from tubaeform flue gas discharge port, because the sudden decrease of flow space, the flue gas can be followed tubaeform flue gas discharge port blowout with higher speed than usual, and tubaeform flue gas discharge port's position is fairly close the defroster baffling board again, therefore a large amount of flue gases can directly be sprayed to on the baffling board. This has just given every section baffling board to catch the volume of liquid drop in the flue gas and obtained huge promotion, and then has improved the whole defogging efficiency of defroster, and the baffling board can flow to in the arc waste liquid collecting pipe with the liquid drop on the baffling flue gas channel unit outer wall under the dead weight effect, avoids staying the corruption that causes for a long time.
Has the advantages that:
firstly, the smoke is enabled to obtain high speed towards the baffle plate by reducing the flowing space of the smoke, and the probability of the baffle plate for catching liquid drops in the smoke is greatly increased.
And secondly, due to the design of the horn-shaped smoke discharge port, liquid drops which are stained on the horn-shaped discharge port can flow down along the inclined angle more easily, and the corrosion to the folded plate caused by the long-time stay of the liquid drops is greatly reduced.
Thirdly, the arc waste liquid collecting pipe is designed to collect liquid drops, treat the liquid drops uniformly and avoid pollution.
And fourthly, due to the structural design of the circular silk screen at the first aperture, the capture amount of the device to liquid drops in the flue gas is increased, and the demisting efficiency is improved to a certain extent.
Drawings
FIG. 1 is a cloud of fluid velocities within a prior art baffle mist eliminator;
FIG. 2 is a diagram of internal traces of a conventional baffle mist eliminator;
FIG. 3 is a prior art internal flow diagram of a baffle mist eliminator;
FIG. 4 is a schematic view of the baffle mist eliminator of the present invention;
FIG. 5 is a schematic view of a flared flue gas discharge port;
FIG. 6 is a schematic structural view of a circular screen;
FIG. 7 is a side view of a series-parallel flue gas discharge device.
Wherein, 1, a series-parallel type smoke discharging device; 2. a flue gas inlet; 3. an air collection port; 4. a first baffled flue gas channel unit; 5. the second baffling flue gas channel unit; 6. a droplet; 7. a waste liquid collecting pipe; 8. a first baffle plate; 9. a second baffle plate; 10. the aperture is one.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings and the specific embodiments in the specification.
The baffling board defroster is the most extensive one kind defroster of using in current desulfurization system, but the defogging efficiency of this type of defroster still remains to promote on the current market, and one of its leading reasons is that the inside catching efficiency to liquid drop in the flue gas of defroster is not high. Therefore, the research and production of the baffle plate demister with high efficiency for internally catching liquid drops become a problem which needs to be solved urgently at present.
In order to solve the problems of the existing structure, the following scheme is adopted:
(1) the change of a velocity distribution area and the trend thereof in a gas-liquid two-phase flow field in the demister is analyzed by adopting a numerical simulation method, and the influence factor of liquid drops in the baffle plate demister separating from flue gas is obtained through analysis.
(2) Through the flow field analysis, aiming at the condition that the defogging efficiency is not high, the optimal design is carried out on the defogger of the flow folding plate by combining the results of numerical simulation analysis of various working conditions.
The method comprises the following specific steps:
(1) firstly, drawing a simplified diagram of the existing baffle plate demister by cad software, then introducing the simplified diagram into Fluent software, and performing flow field analysis on the interior of the existing baffle plate demister by a numerical simulation method to obtain three flow field analysis diagrams of fig. 1, fig. 2 and fig. 3 respectively.
Fig. 1 is a cloud chart of fluid velocity inside the baffle plate demister, and it is obvious from the cloud chart that flow fields at various positions inside the baffle plate demister are relatively stable and the flow velocity does not change much. At baffling board defroster entrance, the even fast entering of flue gas, when the flue gas was through first curved mouthful, the air current turned right side deflection, and the right-hand regional speed increase this moment, and the regional speed in left is less. When the smoke passes through the second bend, the speed of the left area is increased and changed into a high-speed area, and the speed of the right area is changed into a low-speed area. The whole smoke movement process is observed, so that the speed of smoke flowing at the two bends reaches the peak value, but the smoke in the middle area, particularly the area close to the wall surface of the baffle plate, is almost in a low-speed state.
As can be seen from fig. 2 and 3, the internal line pattern of the baffle demister is relatively stable, and the flow fields form a streamline structure, so that if the flue gas flows relatively stably, the flue gas hardly collides with the baffles. Especially when the flue gas in the defroster passes through middle zone, especially when being close to the wall region, the chance that the liquid drop in the flue gas bumps with the wall is just littleer, and then leads to the decline of defogging efficiency.
According to the analysis of the flow field diagram in the baffle plate demister, the probability that the flue gas is thrown to the wall surface of the baffle plate is greatly improved by increasing the degree of disorder in the demister, namely, the opportunity that the baffle plate catches liquid drops in the flue gas is increased, and the demisting efficiency is improved.
Fig. 4 shows a schematic working diagram of the novel baffle demister, the structure mainly comprises a series-parallel flue gas discharge device 1 arranged above a flue gas inlet 2, the series-parallel flue gas discharge device 1 adopts a double-layer folded plate structure design, and the appearance of the device is similar to the folded plate form of the baffle demister.
The utility model provides a baffling board defroster, includes the defroster body, the bottom of defroster body is equipped with flue gas entry 2, and the flue gas warp flue gas entry 2 gets into the inside flue gas channel of defroster body, the inside baffling board that is equipped with of flue gas channel, flue gas channel includes:
the diameter of the gas collecting port 3 is smaller than that of the flue gas inlet, the bottom end of the gas collecting port 3 is connected with the flue gas inlet, the upper end of the gas collecting port 3 is divided into two baffling flue gas channel units, namely a first baffling flue gas channel unit 4 and a second baffling flue gas channel unit 5, wherein the first baffling flue gas channel unit 4 is arranged close to a first baffle plate 8 positioned on the left side of the flue gas channel, and the shape of the longitudinal section of the first baffling flue gas channel unit 4 is the same as that of the longitudinal section of the first baffle plate 8;
the second baffling flue gas channel unit 5 is arranged close to a second baffling plate 9 positioned on the right side of the flue gas channel, and the shape of the longitudinal section of the second baffling flue gas channel unit 5 is the same as that of the longitudinal section of the second baffling plate 9;
the first baffling flue gas channel unit 4 is formed by arranging two folded plates with the same shape in parallel, and a first horn-shaped flue gas discharge port which enables flue gas to be sprayed onto the first folded plate at an accelerated speed is formed in the folded plate, which is close to one side of the first folded plate 8, on the first baffling flue gas channel unit;
the second baffling flue gas channel unit 5 is formed by parallelly arranging two folded plates with the same shape, and a second horn-shaped flue gas discharge port for accelerating flue gas to be sprayed onto the second baffling plate is formed in the folded plate, close to one side of the second baffling plate 9, on the second baffling flue gas channel unit.
The schematic diagram of the trumpet-shaped flue gas discharge port is shown in fig. 5, wherein a circular screen design is added at the discharge port with the large aperture, namely the aperture I10, so that when the flue gas is discharged from the trumpet-shaped flue gas discharge port and passes through the aperture II to the aperture I10, liquid drops in part of the flue gas can be captured due to the screen design on the aperture I10.
In addition, the smoke discharge port adopts a horn-shaped design, so that liquid drops on the inner walls of two sides of the discharge port can flow down into the arc-shaped waste liquid collecting pipe 7 through the first aperture 10 along the inclined angle.
The arc waste liquid collecting pipe 7 is designed at two sides of the gas collecting opening 8 and is symmetrical with each other, so that the corrosion of liquid drops to the folded plate is greatly avoided.
All folded plates capable of contacting smoke are coated with PTFE coatings, and the PTFE coatings have the characteristics of corrosion resistance and high and low temperature resistance and can be used at-180-260 ℃ for a long time.
The working mode of the baffle plate demister comprises the following steps:
when the defroster during operation, the flue gas is with high-speed multidirectional flow through the flue gas entrance, begin to enter into series-parallel formula flue gas discharging device 1 with the mode of serial-type through gas collection mouth 3, because series-parallel formula flue gas discharging device's design, the flow space of flue gas that has significantly reduced for a large amount of flue gases are concentrated at gas collection mouth 3, then get into first baffling flue gas channel unit 4 and second baffling flue gas channel unit 5 fast from gas collection mouth 3 left and right both sides respectively through the mode of parallelly connected reposition of redundant personnel.
When the flue gas flows through the tubaeform flue gas discharge port on the baffling flue gas passageway unit, a large amount of flue gas is discharged from tubaeform flue gas discharge port, because the sudden drop of flow space, the flue gas can be followed tubaeform flue gas discharge port 5 blowout with higher speed than usual, and tubaeform flue gas discharge port's position is fairly close the defroster baffling board again, therefore a large amount of flue gas can directly be sprayed on the baffling board. This provides a great increase in the amount of liquid droplets captured in the flue gas by each section of baffle. And then the whole defogging efficiency of the defogger is improved. The liquid drops on the outer walls of the baffle plate and the baffling flue gas channel unit flow into the arc-shaped waste liquid collecting pipe under the action of self weight, so that the corrosion caused by long-time stay is avoided.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110301359.2A CN113082855A (en) | 2021-03-22 | 2021-03-22 | Baffle plate demister and working method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110301359.2A CN113082855A (en) | 2021-03-22 | 2021-03-22 | Baffle plate demister and working method thereof |
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| CN113082855A true CN113082855A (en) | 2021-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110301359.2A Pending CN113082855A (en) | 2021-03-22 | 2021-03-22 | Baffle plate demister and working method thereof |
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Citations (6)
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| EP0348009A1 (en) * | 1988-06-23 | 1989-12-27 | Shell Internationale Researchmaatschappij B.V. | Device for separating liquid droplets from a gas stream |
| CN105879550A (en) * | 2016-05-19 | 2016-08-24 | 江苏中建材环保研究院有限公司 | Desulfurization demister device |
| CN107224788A (en) * | 2017-07-19 | 2017-10-03 | 合肥天翔环境工程有限公司 | A kind of spiral board demister |
| CN209714650U (en) * | 2019-03-15 | 2019-12-03 | 南京碧林环保科技有限公司 | The baffle plate type demisting deduster of built-in cooling |
| CN111939654A (en) * | 2020-09-07 | 2020-11-17 | 西南石油大学 | A novel vane type mist eliminator with orifice inner structure |
| CN112387042A (en) * | 2020-10-20 | 2021-02-23 | 淮阴工学院 | Novel silk screen defroster that separation efficiency is high |
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2021
- 2021-03-22 CN CN202110301359.2A patent/CN113082855A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0348009A1 (en) * | 1988-06-23 | 1989-12-27 | Shell Internationale Researchmaatschappij B.V. | Device for separating liquid droplets from a gas stream |
| CN105879550A (en) * | 2016-05-19 | 2016-08-24 | 江苏中建材环保研究院有限公司 | Desulfurization demister device |
| CN107224788A (en) * | 2017-07-19 | 2017-10-03 | 合肥天翔环境工程有限公司 | A kind of spiral board demister |
| CN209714650U (en) * | 2019-03-15 | 2019-12-03 | 南京碧林环保科技有限公司 | The baffle plate type demisting deduster of built-in cooling |
| CN111939654A (en) * | 2020-09-07 | 2020-11-17 | 西南石油大学 | A novel vane type mist eliminator with orifice inner structure |
| CN112387042A (en) * | 2020-10-20 | 2021-02-23 | 淮阴工学院 | Novel silk screen defroster that separation efficiency is high |
Non-Patent Citations (2)
| Title |
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| 杨崇高等: "折流板除雾器内部的流场分析与结构优化", 《装备制造技术》 * |
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Application publication date: 20210709 |
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