CN113731097A - Device for regulating and controlling water vapor environment and promoting fine particles to grow up based on influence of carrier gas components - Google Patents
Device for regulating and controlling water vapor environment and promoting fine particles to grow up based on influence of carrier gas components Download PDFInfo
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- CN113731097A CN113731097A CN202111042688.6A CN202111042688A CN113731097A CN 113731097 A CN113731097 A CN 113731097A CN 202111042688 A CN202111042688 A CN 202111042688A CN 113731097 A CN113731097 A CN 113731097A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D51/02—Amassing the particles, e.g. by flocculation
Abstract
The invention discloses a device for regulating and controlling a water vapor environment to promote fine particles to grow up based on the influence of carrier gas components, which comprises a gas buffer chamber, a gas separation chamber, a gas regulation chamber and a phase change chamber; the gas buffer chamber is provided with a flue gas inlet, and an air distribution plate is arranged at the position close to the flue gas inlet; the gas separation chamber is provided with a gas inlet valve and a gas outlet valve; the left end of the gas regulating chamber is provided with a flue gas inlet, the right end of the gas regulating chamber is provided with a flue gas outlet, and the upper end of the gas regulating chamber is provided with a gas adding port; and the upper part of the phase change chamber is provided with a water inlet valve, a spraying device, a demister and a flue gas outlet. The method establishes the optimal supersaturated water vapor environment for the growth of fine particles to a certain extent, adopts a mode of adjusting the proportion of carrier gas components, simultaneously adjusts and controls the heat and mass transfer process of water vapor as far as possible under different operating conditions of high-temperature or low-temperature flue gas, and is more favorable for establishing an efficient supersaturated water vapor environment to promote the condensation and growth of water vapor on the surfaces of the particles.
Description
Technical Field
The invention belongs to the field of research on a technology for promoting growth of fine particles based on water vapor phase change, and particularly relates to a device for promoting growth of fine particles based on the influence of carrier gas components on regulating and controlling a water vapor environment.
Background
Fine particulate matter PM2.5Pollution has become a prominent environmental problem in the atmosphere, PM2.5Not only has serious harm to human health, but also is one of important factors causing environmental problems such as reduced atmospheric visibility and photochemical smog. Although the collection efficiency of the conventional dust removal technology for coarse particles with the particle size of more than 10 μm can reach more than 99%, the removal efficiency for particles with the particle size of 0.1-1 μm is still low, and a large amount of fine particles are discharged into the atmosphere. At present, a pretreatment facility is arranged in front of a conventional dust removal device to enable the fine particles to grow into larger particles through physical or chemical action and then to be removed, wherein the growth of the fine particles is promoted by utilizing water vapor phase change to become one of important research routes of pretreatment technology. The mechanism for promoting the growth of fine particles by applying the phase change of water vapor is as follows: the water vapor takes fine particles as condensation nuclei to generate phase change liquefaction, and the fine particles are promoted to continuously move under the action of diffusion swimming force and thermophoretic force to collide with each other, so that the fine particles grow up. Research shows that the supersaturated water vapor environment is a precondition for ensuring the growth of fine particles, the growth of the particles and the supersaturation degree are in a certain degree of exponential relationship, and the coal-fired flue gas mainly comprises nitrogen, oxygen, carbon dioxide, sulfur dioxide and other gases. According to related researches, the water vapor has different heat and mass transfer properties under different carrier gas conditions, so that the construction of a supersaturated environment is influenced, meanwhile, the supersaturated water vapor environment characteristics formed by adopting different construction modes of heating or cooling gas flows are obviously different, and the realization of the efficient construction of the supersaturated environment based on the components of the coal-fired flue gas is very important.
Disclosure of Invention
The invention provides a device for regulating and controlling a water vapor environment to promote fine particles to grow based on carrier gas component influence, and aims to solve the problem of influence of a carrier gas atmosphere on the construction of a high-efficiency supersaturated water vapor environment in the process of promoting the fine particles to grow through water vapor phase change.
The technical scheme adopted by the invention is as follows: a device for regulating and controlling a water vapor environment to promote fine particles to grow up based on the influence of carrier gas components comprises a gas buffer chamber, a gas separation chamber, a gas regulation chamber and a phase change chamber;
one end of the gas buffer chamber is provided with a first flue gas inlet, and a first air distribution plate is arranged between the first flue gas inlet and the gas buffer chamber; the other end of the gas buffer chamber is respectively connected with a gas valve I and a gas valve II, and the gas valve II is connected with a gas valve IV;
one end of the gas separation chamber is connected with the first gas valve, and the other end of the gas separation chamber is connected with the third gas valve;
one end of the gas regulating chamber is respectively connected with a gas valve IV and a gas valve III, the other end of the gas regulating chamber is connected with a smoke inlet II arranged on the side surface of the phase change chamber, and the upper end of the gas regulating chamber is provided with an air inlet valve;
an air distribution plate II is arranged above the smoke inlet II; the upper part of the phase change chamber is provided with a spraying device, and the spraying device is connected with a water inlet valve; the top of the phase change chamber is provided with a demister, and the demister is connected with the flue gas outlet IV; a drainage valve is arranged at the bottom of the phase change chamber;
the cross sectional areas of the first air distribution plate and the second air distribution plate are respectively the same as the cross sectional areas of the gas buffer chamber and the phase change chamber.
The flue gas adopted by the invention has the property of containing CO at high temperature and high humidity or low temperature and high humidity2And the like.
Preferably, the gas buffer chamber, the gas separation chamber, the gas conditioning chamber and the phase change chamber are cylindrical.
Preferably, the outer layers of the gas buffer chamber, the gas separation chamber, the gas regulation chamber and the phase change chamber are all made of heat insulation materials which do not exchange heat with the outside.
Preferably, the particle size range of the fog drops generated by the spraying device can be adjusted between 0.05 and 5 um.
Preferably, the temperature resistant range of the spraying device is between 5 and 100 ℃.
Has the advantages that:
the device for promoting the growth of the fine particles by regulating the phase change of water vapor based on the influence of the carrier gas, provided by the invention, adopts a mode of regulating the proportion of the carrier gas to construct a more efficient supersaturated water vapor environment to promote the growth of the fine particles. Meanwhile, aiming at different supersaturation construction modes, the components of gases with different Lewis numbers (Le) are adjusted, and a more favorable water vapor environment is provided for the growth of fine particles.
Drawings
FIG. 1 is a schematic diagram of the construction of a supersaturated environment based on different gas compositions of a heated gas stream.
FIG. 2 is a schematic diagram of the construction of a supersaturated environment for different gas compositions based on a cooling gas flow.
FIG. 3 is a schematic view of the structure of the device of the present invention.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
Fig. 1 and fig. 2 are theoretical bases of the present invention, and it can be seen that different lewis number (Le) gases exhibit different supersaturated water vapor environment characteristics under different supersaturation construction modes, based on which, the present invention provides a device for promoting fine particle growth based on carrier gas component influence regulation and control water vapor environment.
As shown in fig. 3, a device for regulating and controlling a water vapor environment to promote fine particle growth based on carrier gas component influence comprises a gas buffer chamber 3, a gas separation chamber 6, a gas regulation chamber 9 and a phase change chamber 12;
one end of the gas buffer chamber 3 is provided with a first flue gas inlet 1, and a first air distribution plate 2 is arranged between the first flue gas inlet 1 and the gas buffer chamber 3; the other end of the gas buffer chamber 3 is respectively connected with a gas valve I4 and a gas valve II 5, and the gas valve II 5 is connected with a gas valve IV 8;
one end of the gas separation chamber 6 is connected with the first gas valve 4, and the other end of the gas separation chamber 6 is connected with the third gas valve 7;
one end of the gas regulating chamber 9 is respectively connected with a gas valve IV 8 and a gas valve III 7, the other end of the gas regulating chamber 9 is connected with a second flue gas inlet 11 arranged on the side surface of the phase change chamber 9, and the upper end of the gas regulating chamber 9 is provided with an air inlet valve 10;
an air distribution plate II 13 is arranged above the smoke inlet II 11; the upper part of the phase change chamber 12 is provided with a spraying device 15, and the spraying device 15 is connected with a water inlet valve 14; the top of the phase change chamber 12 is provided with a demister 16, and the demister 16 is connected with a flue gas outlet IV 17; a drain valve 18 is arranged at the bottom of the phase change chamber 12;
the cross sectional areas of the first air distribution plate 2 and the second air distribution plate 11 are respectively the same as the cross sectional areas of the gas buffer chamber 3 and the phase change chamber 12.
The gas buffer chamber 3, the gas separation chamber 6, the gas regulation chamber 9 and the phase change chamber 12 are cylindrical; the gas buffer chamber 3, the gas separation chamber 6, the gas regulation chamber 9 and the phase change chamber 12 are all made of heat insulation materials which do not exchange heat with the outside; the particle size range of the fog drops generated by the spraying device 15 can be adjusted between 0.05 and 5 um; the temperature resistant range of the spraying device 15 is between 5 and 100 ℃.
By taking high-temperature and high-humidity flue gas as an example, the method for promoting the growth of fine particles based on the influence of carrier gas components on regulating and controlling a water vapor environment is explained by using the device disclosed by the invention. The flue gas enters a gas buffer chamber 3 from a flue gas inlet 1, a gas valve 4 is opened, and the flue gas enters a gas separation chamber 6 because of Le<The gas component of 0.5 is extremely unfavorable for the construction of supersaturated water vapor environment in the process of cooling the flue gas, and CO with high content is separated in the gas separation chamber 62Separating out, then opening a third gas valve 7, enabling the flue gas to enter a gas regulating chamber 9, opening a gas inlet valve 10, selecting gas with a large number of Les (such as helium, nitrogen and the like) to enter the gas regulating chamber 9 to improve gas components with a large number of Les in the flue gas, then enabling the flue gas to enter a phase change chamber 12 through a second flue gas inlet 11, opening a water inlet valve 14 to introduce cold water with the temperature lower than the temperature of the flue gas into a spraying device 15, enabling the spraying device 15 to spray small fog drops with the particle size range similar to that of particles in the flue gas, enabling the high-temperature flue gas containing the particles to rapidly transfer heat to low-temperature small fog drops, and rapidly cooling the flue gas to reach supersaturation (supersaturation degree: 1.1-2); on one hand, water vapor is condensed on the particle surface to promote the growth of fine particles, and on the other hand, the particle size of the small fog drops is similar to that of the fine particles, so that the collision effect between the small fog drops and the fine particles is enhanced, and the growth of the fine particles can be promoted. The large dust-laden droplets are then captured and collected by a mist eliminator 16 above the phase change chamber 12.
If the temperature of the flue gas is lower, the flue gas enters the gas buffer chamber 3 from the first flue gas inlet 1, the second gas valve 5 is opened, the flue gas directly enters the gas regulating chamber 9, and the gas inlet valve is openedA gate 10 for selecting a gas (e.g., CO) having a small Le number2Etc.) enter the gas regulating chamber 9 to improve the gas component with smaller Le number in the flue gas, then the flue gas enters the phase change chamber 12 through the second flue gas inlet 11, the water inlet valve 14 is opened to introduce hot water with temperature higher than that of the flue gas into the spray device 15, the high-temperature droplets transfer heat to the low-temperature flue gas containing particles, meanwhile, the water vapor continuously diffuses in the flue gas, and for the flue gas with smaller Le number, the diffusion degree of the water vapor in the flue gas is higher compared with the heat transfer water vapor, so that a supersaturated water vapor environment is formed.
It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (5)
1. The utility model provides a device that fine particle grows up is promoted to regulation and control steam environment based on carrier gas component influence which characterized in that: comprises a gas buffer chamber, a gas separation chamber, a gas regulation chamber and a phase change chamber;
one end of the gas buffer chamber is provided with a first flue gas inlet, and a first air distribution plate is arranged between the first flue gas inlet and the gas buffer chamber; the other end of the gas buffer chamber is respectively connected with a gas valve I and a gas valve II, and the gas valve II is connected with a gas valve IV;
one end of the gas separation chamber is connected with the first gas valve, and the other end of the gas separation chamber is connected with the third gas valve;
one end of the gas regulating chamber is respectively connected with a gas valve IV and a gas valve III, the other end of the gas regulating chamber is connected with a smoke inlet II arranged on the side surface of the phase change chamber, and the upper end of the gas regulating chamber is provided with an air inlet valve;
an air distribution plate II is arranged above the smoke inlet II; the upper part of the phase change chamber is provided with a spraying device, and the spraying device is connected with a water inlet valve; the top of the phase change chamber is provided with a demister, and the demister is connected with the flue gas outlet IV; a drainage valve is arranged at the bottom of the phase change chamber;
the cross sectional areas of the first air distribution plate and the second air distribution plate are respectively the same as the cross sectional areas of the gas buffer chamber and the phase change chamber.
2. The device for promoting the growth of the fine particles based on the carrier gas influence and the regulation of the phase change of the water vapor as claimed in claim 1, wherein: the gas buffer chamber, the gas separation chamber, the gas regulation chamber and the phase change chamber are cylindrical.
3. The device for promoting the growth of the fine particles based on the carrier gas influence and the regulation of the phase change of the water vapor as claimed in claim 1, wherein: the outer layers of the gas buffer chamber, the gas separation chamber, the gas regulation chamber and the phase change chamber are all made of heat insulation materials which do not exchange heat with the outside.
4. The device for promoting the growth of the fine particles based on the carrier gas influence and the regulation of the phase change of the water vapor as claimed in claim 1, wherein: the particle size range of the fog drops generated by the spraying device can be adjusted between 0.05 and 5 um.
5. The device for promoting the growth of the fine particles based on the carrier gas influence and the regulation of the phase change of the water vapor as claimed in claim 1, wherein: the temperature resistant range of the spraying device is between 5 and 100 ℃.
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| CN202111042688.6A CN113731097A (en) | 2021-09-07 | 2021-09-07 | Device for regulating and controlling water vapor environment and promoting fine particles to grow up based on influence of carrier gas components |
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| CN202111042688.6A CN113731097A (en) | 2021-09-07 | 2021-09-07 | Device for regulating and controlling water vapor environment and promoting fine particles to grow up based on influence of carrier gas components |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116392917A (en) * | 2023-05-26 | 2023-07-07 | 河北师范大学 | Device for improving growth of fine particles based on condition of low energy consumption of vapor phase |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116392917A (en) * | 2023-05-26 | 2023-07-07 | 河北师范大学 | Device for improving growth of fine particles based on condition of low energy consumption of vapor phase |
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Application publication date: 20211203 |