CN111111482A - Air and flue gas mixing device based on Venturi principle - Google Patents
Air and flue gas mixing device based on Venturi principle Download PDFInfo
- Publication number
- CN111111482A CN111111482A CN202010125449.6A CN202010125449A CN111111482A CN 111111482 A CN111111482 A CN 111111482A CN 202010125449 A CN202010125449 A CN 202010125449A CN 111111482 A CN111111482 A CN 111111482A
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- Prior art keywords
- flue gas
- box body
- air
- venturi
- mixing device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/10—Mixing gases with gases
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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
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
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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
- B01D53/26—Drying gases or vapours
- B01D53/266—Drying gases or vapours by filtration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses an air and flue gas mixing device based on a Venturi principle, which comprises a box body, wherein a combustion-supporting air inlet is arranged on the left side surface of the box body, an air and flue gas mixture outlet is arranged on the right side surface of the box body, a flue gas input pipeline is inserted into the box body through the top of the box body, and a side plate of the outlet of the flue gas input pipeline is a Venturi inclined plate which is positioned in the box body; a condensation filter screen is arranged in the box body, and a combustion-supporting air inlet, a flue gas input pipeline, the condensation filter screen and an air and flue gas mixture outlet are sequentially distributed from right to left; the bottom of box is provided with the comdenstion water discharge hole, and wherein, the comdenstion water discharge hole is located between condensation filter screen and the air flue gas mixture export, and the device can solve present recirculation system effectively and drop into the combustion air in the mixed degree poor and the difficult problem of appearing, difficult discharge of condensate water.
Description
Technical Field
The invention belongs to the technical field of ultra-low nitrogen clean combustion, and relates to an air and flue gas mixing device based on a Venturi principle.
Background
In recent years, with the requirement of ultralow nitrogen emission of a gas boiler, an ultralow nitrogen modification technical route is a low-nitrogen gas burner and a flue gas recirculation system. The flue gas recirculation technology in the technology is particularly important for nitrogen reduction. The combination point of the recirculation system and the low-nitrogen gas burner system is the flue gas and air mixing box.
At present, after the ultra-low nitrogen transformation and transformation, the outstanding problems of poor mixing of flue gas and air, large condensate water and the like are found. These problems directly affect combustion stability. Therefore, a flue gas and air mixing device is urgently needed to solve the problems that the mixing degree of the existing recirculation system which is put into combustion air is poor, and condensed water is difficult to separate out and discharge.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an air and flue gas mixing device based on a Venturi principle, which can effectively solve the problems that the existing recirculation system is poor in mixing degree when being thrown into combustion air and condensate water is difficult to separate out and discharge.
In order to achieve the aim, the air and smoke mixing device based on the Venturi principle comprises a box body, wherein a combustion-supporting air inlet is formed in the left side surface of the box body, an air and smoke mixture outlet is formed in the right side surface of the box body, a smoke input pipeline is inserted into the box body through the top of the box body, and a side plate of the smoke input pipeline outlet is a Venturi inclined plate which is positioned in the box body;
a condensation filter screen is arranged in the box body, and a combustion-supporting air inlet, a flue gas input pipeline, the condensation filter screen and an air and flue gas mixture outlet are sequentially distributed from right to left;
and a condensed water discharge hole is formed in the bottom of the box body, wherein the condensed water discharge hole is positioned between the condensation filter screen and the air-flue gas mixture outlet.
The included angle between the Venturi inclined plate and the vertical surface is 45-60 degrees.
The flue gas input pipe penetrates through the top of the box body and extends into the position 1/3-1/2 of the combustion air inlet.
The water guide slope plate is arranged in the box body and located at the bottom of the box body, the water guide slope plate is located between the combustion air inlet and the condensation filter screen, and the water guide slope plate inclines downwards along the direction from the combustion air inlet to the condensation filter screen.
The diameter of the opening of the condensation filter screen is 1.5mm-3 mm.
The included angle between the water guide slope plate and the horizontal plane is 5-10 degrees.
The condensed water discharge hole is of a U-shaped structure.
And the side wall of the box body is provided with an access hole.
The invention has the following beneficial effects:
when the air-flue gas mixing device based on the Venturi principle is specifically operated, combustion-supporting air is fed into a box body through a combustion-supporting air inlet, flue gas is fed through a flue gas input pipeline, after the combustion-supporting air passes through the Venturi inclined plate, a negative pressure area is formed at the upper part of the Venturi inclined plate, the flue gas can be well sucked and collided and mixed with incoming air, good cross mixing is realized, the mixing uniformity is ensured, after the flue gas is mixed in the area, condensed water in partial flue gas can be separated out due to temperature reduction, the mixture is filtered through a condensing filter screen again, the remaining 90% of moisture in the flue gas is captured and discharged through a condensed water discharge hole, and the problems that the mixing degree of the existing recirculation system which is put into the combustion-supporting air is poor, and the condensed water is difficult to separate out.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a side view of the present invention;
fig. 3 is a schematic structural view of the inside of the case 9.
Wherein, 1 is combustion air inlet, 2 is flue gas input pipeline, 3 is air flue gas mixture export, 4 is the access hole, 5 is the comdenstion water discharge hole, 6 is condensation filter screen, 7 is water guide slope board, 8 is the venturi swash plate, 9 is the box.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1 to 3, the air-flue gas mixing device based on the venturi principle of the present invention includes a box 9, a combustion air inlet 1 is disposed on a left side surface of the box 9, an air-flue gas mixture outlet 3 is disposed on a right side surface of the box 9, a flue gas input pipe 2 is inserted into the box 9 through a top of the box 9, a side plate of the outlet of the flue gas input pipe 2 is a venturi inclined plate 8, wherein the venturi inclined plate 8 is located in the box 9; a condensation filter screen 6 is arranged in the box body 9, and a combustion-supporting air inlet 1, a flue gas input pipeline 2, the condensation filter screen 6 and an air flue gas mixture outlet 3 are sequentially distributed from right to left; the bottom of the box 9 is provided with a condensate discharge hole 5, wherein the condensate discharge hole 5 is positioned between the condensate filter screen 6 and the air-flue gas mixture outlet 3.
The included angle between the Venturi inclined plate 8 and the vertical surface is 45-60 degrees; the flue gas input pipeline 2 penetrates through the top of the box body 9 and extends into the position 1/3-1/2 of the combustion air inlet 1; a water guide slope plate 7 is arranged in the box body 9, wherein the water guide slope plate 7 is positioned at the bottom of the box body 9, the water guide slope plate 7 is positioned between the combustion air inlet 1 and the condensation filter screen 6, and the water guide slope plate 7 inclines downwards along the direction from the combustion air inlet 1 to the condensation filter screen 6; the diameter of the opening of the condensation filter screen 6 is 1.5mm-3 mm; the included angle between the water guide slope plate 7 and the horizontal plane is 5-10 degrees; the condensed water discharge hole 5 is of a U-shaped structure; the side wall of the box body 9 is provided with an access hole 4.
The specific working process of the invention is as follows:
combustion air is sent into the box body 9 through the combustion air inlet 1, flue gas is sent into through the flue gas input pipeline 2, after the combustion air passes through the Venturi sloping plate 8, a negative pressure zone is formed on the upper portion of the Venturi sloping plate 8, the flue gas can be well sucked and mixed with incoming air in a collision manner, good cross mixing is realized, the mixing uniformity is guaranteed, after the mixing in the zone, partial condensed water in the flue gas can be separated out due to temperature reduction, the mixture is filtered through the condensation filter screen 6 again, the residual 90% of moisture in the flue gas is captured, and because the water guide sloping plate 7 is arranged in the box body 9, the condensed water can be discharged after flowing into the condensed water discharge hole 5 along the sloping plate, so that the high mixing degree of the flue gas and air mixture is guaranteed.
Claims (8)
1. An air and flue gas mixing device based on a Venturi principle is characterized by comprising a box body (9), wherein a combustion air inlet (1) is formed in the left side surface of the box body (9), an air and flue gas mixture outlet (3) is formed in the right side surface of the box body (9), a flue gas input pipeline (2) is inserted into the box body (9) through the top of the box body (9), a side plate of the outlet of the flue gas input pipeline (2) is a Venturi inclined plate (8), and the Venturi inclined plate (8) is located in the box body (9);
a condensation filter screen (6) is arranged in the box body (9), and a combustion-supporting air inlet (1), a flue gas input pipeline (2), the condensation filter screen (6) and an air and flue gas mixture outlet (3) are sequentially distributed from right to left;
the bottom of the box body (9) is provided with a condensed water discharge hole (5), wherein the condensed water discharge hole (5) is positioned between the condensing filter screen (6) and the air-smoke mixture outlet (3).
2. Air-flue gas mixing device based on venturi principle according to claim 1, characterized by that the angle between venturi inclined plate (8) and vertical plane is 45 ° -60 °.
3. Venturi based air-flue gas mixing device according to claim 1, characterized in that the flue gas input duct (2) extends through the top of the box (9) to the combustion air inlet (1) at the position 1/3-1/2.
4. The venturi-principle-based air-flue gas mixing device according to claim 1, wherein a water guide slope plate (7) is arranged in the box body (9), wherein the water guide slope plate (7) is located at the bottom of the box body (9), the water guide slope plate (7) is located between the combustion air inlet (1) and the condensation filter screen (6), and the water guide slope plate (7) is inclined downwards along the direction from the combustion air inlet (1) to the condensation filter screen (6).
5. Air-flue gas mixing device based on venturi principle according to claim 1, characterized by that, the aperture diameter of the condensation filter screen (6) is 1.5mm-3 mm.
6. The venturi-based air-flue gas mixing device according to claim 1, wherein the water guiding slope plate (7) has an angle of 5 ° to 10 ° with the horizontal plane.
7. The venturi-based air-flue gas mixing device according to claim 1, wherein the condensate discharge hole (5) is of a U-shaped configuration.
8. Venturi principle based air-flue gas mixing device according to claim 1, characterized in that the side walls of the box (9) are provided with access holes (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010125449.6A CN111111482A (en) | 2020-02-27 | 2020-02-27 | Air and flue gas mixing device based on Venturi principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010125449.6A CN111111482A (en) | 2020-02-27 | 2020-02-27 | Air and flue gas mixing device based on Venturi principle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111111482A true CN111111482A (en) | 2020-05-08 |
Family
ID=70493232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010125449.6A Pending CN111111482A (en) | 2020-02-27 | 2020-02-27 | Air and flue gas mixing device based on Venturi principle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111111482A (en) |
-
2020
- 2020-02-27 CN CN202010125449.6A patent/CN111111482A/en active Pending
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