CN208295947U - A kind of full negative pressure drainage type air and powder mixer - Google Patents
A kind of full negative pressure drainage type air and powder mixer Download PDFInfo
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- CN208295947U CN208295947U CN201820503551.3U CN201820503551U CN208295947U CN 208295947 U CN208295947 U CN 208295947U CN 201820503551 U CN201820503551 U CN 201820503551U CN 208295947 U CN208295947 U CN 208295947U
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Abstract
The utility model relates to coal dust transportation arts, it is especially applied to a kind of full negative pressure drainage type air and powder mixer of pulverized-coal fired boiler industry, including inlet air plenum, powder inlet hopper, discharge chamber, wind powder mixing chamber, the wind powder mixing chamber front end and inlet air plenum rear end connection, top and lower end of hopper connection, rear end and discharge chamber connection；The lower end of hopper aweather extends to form drainage plate in powder mixing chamber, is provided with middle supporting plate in the middle part of the wind powder mixing chamber.After adopting the above structure, the utility model stops to turn to powder falling bucket from the high speed winds that inlet air plenum is come by drainage plate, and the subnormal ambient in guarantee powder inlet hopper is not destroyed；When high speed winds pass through wind powder mixing chamber, suction-operated is generated to the coal dust in powder falling bucket, is sent into burner combustion after coal dust and high speed winds blending uniformly.
Description
Technical field
The utility model relates to coal dust transportation arts, are especially applied to a kind of full negative pressure drainage type of pulverized-coal fired boiler industry
Air and powder mixer.
Background technique
In current water-tube boiler industry, 85% or so share is coal-burning boiler.Compared to it is traditional with raw coal be combustion
The chain furnace of material, new and effective pulverized-coal fired boiler have the characteristics that energy-efficient, clean emission, high degree of automation.Traditional chain
The raw coal stacking of bar oven is at random, there are security risk, O&M environment are poor.The coal powder conveying system sealing operation of pulverized-coal fired boiler, nothing
Dust race emits, securely and reliably.
Coal powder conveying system as shown in Figure 1, it includes air and powder mixer 10, blower 20, powder cabin 30, burner 40；Such as
Wherein existing air and powder mixer 10 includes inlet air plenum 11, powder inlet hopper 12, discharge chamber 13, wind powder mixing chamber 14, upper pallet shown in Fig. 2
15a, lower pallet 15b.Blower 20 passes through 11 connection of inlet air plenum of pipeline and air and powder mixer 10, and powder cabin 30 passes through pipeline and wind powder
The discharge chamber 13 of 12 connection of powder inlet hopper of mixer 10, air and powder mixer 10 passes through pipeline and burner connection.Coal dust conveyed
Journey: the coal dust in powder cabin 30 falls into air and powder mixer 10 by pipeline, and air is sent into air and powder mixer 10 through pipeline by blower 20,
Air and coal dust blend to form uniform wind powder mixture in the air and powder mixer 10 of special construction, and wind powder mixture is with jet stream
The form high speed of wind is sent into burner 40 and burns.
The special construction of existing air and powder mixer 10 as shown in Figure 2, inlet air plenum 11 are the circle of round tube and top cut-out
14 connection of wind powder mixing chamber of pipe, 13 connection of discharge chamber of wind powder mixing chamber 14 and circular pipe, the air inlet of wind powder mixing chamber 14
Mouth and discharge port are designed by special necking, material-falling hopper 12 and 14 top connection of wind powder mixing chamber；Cloth in wind powder mixing chamber 14
Upper and lower two blocks of supporting plates are set, head and the tail are aligned along powder feeding direction.The operation logic of air and powder mixer is dependent on Venturi effect, high speed
Wind enters wind powder mixing chamber 14 from inlet air plenum 11, and flow area product strongly reduces, and flow velocity is accelerated, on the top of wind powder mixing chamber 14
Negative pressuren zone is formed in powder inlet hopper 12；High speed winds flow through wind powder mixing chamber 14 and generate suction-operated, coal to the coal dust in feed hopper 12
Powder enters wind powder mixing chamber 14 by gravity and suction-operated, and coal dust and high speed winds blending are uniform under the action of adsorption capacity；It mixes
The mixed wind powder mixing high speed winds completed enter pulverized coal feed pipe.
However existing air and powder mixer is during production run that there are still some problems.Problem one: from inlet air plenum 11
It is turned in powder inlet hopper 12 on into the part high speed winds on 14 top of wind powder mixing chamber, on the one hand turns over high speed winds and coal dust is prevented to fall
Under, the subnormal ambient in another aspect powder inlet hopper 12 is destroyed, and high speed winds can not generate absorption to the coal dust in powder inlet hopper 12 and make
With, cause in powder inlet hopper 12 block up powder.Problem two: upper pallet 15a is closer with powder inlet hopper 12,14 top of wind powder mixing chamber
It is turned in the high speed winds of part in powder inlet hopper 12, forms the sinuous flow of wind between upper pallet 15a and powder inlet hopper 12, cause upper pallet
Coal dust on 15a accumulate so that lower pallet 15b between and entire wind powder mixing chamber 14 block up powder, coal dust can not be fine with high speed winds
Blending it is uniform；When wind powder mixing chamber 14 blocks up powder, the lower part lower pallet 15b air duct circulation area is small, and system can not voluntarily block clearing；
The setting of upper and lower supporting plate, so that the space of coal dust and high speed winds blending reduces.
Summary of the invention
The utility model technical issues that need to address are to provide a kind of elimination wind powder mixing chamber high speed winds and turn over, eliminate into
Powder hopper, wind powder mixing chamber block up the full negative pressure drainage type air and powder mixer of powder.
In order to solve the above technical problems, a kind of full negative pressure drainage type air and powder mixer of the utility model, including air inlet
Under room, powder inlet hopper, discharge chamber, wind powder mixing chamber, the wind powder mixing chamber front end and inlet air plenum rear end connection, top and feed hopper
Hold connection, rear end and discharge chamber connection；The lower end of hopper aweather extends to form drainage plate in powder mixing chamber, and the wind powder is mixed
It closes and is provided with middle supporting plate in the middle part of room.
Further, the wind powder mixing chamber is the single side front and back end necking of round tube, and the round tube diameter is D, and necking is deep
Degree is between 0.2D-0.25D；The necking part of the wind powder mixing chamber and the lower port connection of powder inlet hopper.
Further, the cross-sectional height of the necking part of the wind powder mixing chamber is H, and the middle supporting plate is plate,
It is horizontally placed on the depth of section of the necking part of wind powder mixing chamberPlace.
Further, the material of the middle supporting plate uses 316L stainless steel.
Further, the inlet air plenum is tubular type structure, the pipe outlet connection of inlet air plenum front end and blower, inlet air plenum
Rear end and wind powder mixing chamber front end connection.
Further, the powder inlet hopper lower end is with 50-80 angle tilt, the top connection of powder inlet hopper lower end and wind powder mixing chamber
It is logical, the powder falling pipeline connection of powder inlet hopper upper end and powder cabin.
Further, the drainage board width and lower end of hopper equivalent width, go deep into angle and incline with powder inlet hopper lower end
Rake angle is consistent；The drainage version length is between 2cm-5cm.
Further, the discharge chamber is tubular type structure, the rear end connection of discharge chamber front end and wind powder mixing chamber, discharging
The duff pipe connection of room rear end and burner.
Compared with original technology, the utility model is had the advantage that
1. being equipped with drainage plate in the wind powder mixing chamber of air and powder mixer, stop to turn to powder falling from the high speed winds that inlet air plenum is come
Bucket guarantees that the subnormal ambient in powder inlet hopper is not destroyed；When high speed winds pass through wind powder mixing chamber, the coal dust in powder falling bucket is generated
Burner combustion is sent into after suction-operated, coal dust and high speed winds blending uniformly.
2. the setting of drainage plate further reduces flow area product, high speed winds are further speeded up, the negative pressure effect in powder falling bucket
Fruit enhancing also further strengthens the suction-operated of the coal dust in powder falling bucket when high speed winds pass through wind powder mixing chamber.
3. on the one hand the setting of drainage plate guides high speed winds to blow to middle supporting plate, prevents middle supporting plate accumulated powder；On the other hand it guides
The posterior segment of supporting plate in coal dust flow direction in powder inlet hopper.
4. the inclination angle of drainage plate is consistent with the inclination angle of powder inlet hopper lower plate.Inclination angle is excessive, causes the of short duration support powder phenomenon of drainage plate；
Inclination angle is too small, and high speed winds is caused to turn round and round, and increases windage.
5. supporting plate in setting in wind powder mixing chamber, provides the mixed bed of high speed winds and coal dust blending, middle pallet length lengthens, prolongs
The long blending time.
6. supporting plate is located at the depth of section of wind powder mixing chamber inPlace, powder inlet hopper lower end and middle supporting plate spacing increase, and prevent
Only coal dust blocks.Middle supporting plate lower part can effectively prevent pipeline accumulated powder there are longer high speed winds channel.
The preferred 316L of the material of supporting plate in 7., wear-resisting, high temperature resistant.
Detailed description of the invention
Utility model will be further described in detail below with reference to the attached drawings and specific embodiments.
Fig. 1 show coal powder conveying system structural schematic diagram.
Fig. 2 show the structural schematic diagram of existing coal, pulverulent fuel mixer.
Fig. 3 show a kind of structural schematic diagram of the air and powder mixer of full negative pressure drainage type of the utility model.
Specific embodiment
Further to illustrate that the utility model is the technological means reaching goal of the invention and being taken, below in conjunction with attached drawing and
Preferred embodiment, to according to the utility model proposes specific embodiment, structure, feature and its effect, detailed description is as follows.
Be illustrated in figure 3 a kind of full negative pressure drainage type air and powder mixer with the utility model, it include inlet air plenum 11,
Powder inlet hopper 12, discharge chamber 13, wind powder mixing chamber 14.
Inlet air plenum 11 is tubular type structure, the outlet air hose connection of front end and blower 20, rear end and wind powder mixing chamber 14
The connection of front end reducer；Powder inlet hopper 12 is circular upper part and square lower part shape structure, and the powder sinking tube connection of upper end round mouth and powder cabin 30, lower end is rectangular
The top connection of mouth and wind powder mixing chamber 14,12 lower end of powder inlet hopper is with 50-80 angle tilt, 12 lower end of powder inlet hopper and wind powder
The powder falling pipeline connection of the top connection of mixing chamber 14,12 upper end of powder inlet hopper and powder cabin.Discharge chamber 13 is tubular type structure, front end
With the rear end reducer connection of wind powder mixing chamber 14, the duff pipe connection of rear end and burner 40.
14 main structure body of wind powder mixing chamber is the single side front and back end necking of round tube, and centre is cut away part, i.e. wind powder mixing chamber
14 top along constant slope depth cut-out, necking depth between 0.2D-0.25D, depth necking part only with into
12 lower end connection of powder hopper, remaining is sealing.14 front end of wind powder mixing chamber and 11 connection of inlet air plenum, rear end and discharge chamber 14
It is logical, top and 12 connection of powder inlet hopper.
Middle supporting plate 15c is plate, and the cross section of the preferred 316L stainless steel of material, the necking part of the wind powder mixing chamber is high
Degree is H, set on the depth of section of wind powder mixing chamber 14Place, length L15c=L15a+L15b。
Drainage plate 16 is set in wind powder mixing chamber 14, deep along 12 lower end of powder inlet hopper and 14 joint of wind powder mixing chamber, wide
Degree and joint equivalent width, go deep into that angle is consistent with 12 lower end tilt angle of powder inlet hopper, and length is between 2cm-5cm.
A kind of defeated powder process of the coal powder conveying system of full negative pressure drainage type air and powder mixer with the utility model: powder
Coal dust in storehouse 30 is fallen by pipeline in the powder inlet hopper 12 of full negative pressure drainage type air and powder mixer, falls into middle support along drainage plate 16
Plate 15c；High speed winds are sent into the inlet air plenum 11 of full negative pressure drainage type air and powder mixer by blower 20 through pipeline, and then it is mixed to enter wind powder
Close room 14；High speed winds, which are further speeded up efficiently to blend with coal dust, in wind powder mixing chamber 14 forms uniform wind powder mixture,
Wind powder mixture is sent into burner 40 through pipeline in the form of high-speed jet wind and burns.
The stifled powder of pipeline, accumulated powder, the blending of wind powder that the utility model finally can effectively solve coal powder conveying system are uneven, defeated
The problem of powder is discontinuous, defeated powder has some setbacks, improves coal dust transfer efficiency, further promotes the burning of pulverized-coal fired boiler.
More than, it is only the preferred embodiment of the utility model, does not impose any limitation on the present invention, appoints
What those skilled in the art, is not departing within the scope of technical solutions of the utility model, when the skill using the disclosure above
Art content makes a little change or the equivalent embodiment for being modified to equivalent variations, but all without departing from technical solutions of the utility model
Content, any simple modification, equivalent variations and modification made by the above technical examples according to the technical essence of the present invention,
It is still within the scope of the technical solutions of the present invention.
Claims (8)
1. a kind of full negative pressure drainage type air and powder mixer, including inlet air plenum, powder inlet hopper, discharge chamber, wind powder mixing chamber, feature exist
In: the wind powder mixing chamber front end and inlet air plenum rear end connection, top and lower end of hopper connection, rear end and discharge chamber connection；
The lower end of hopper aweather extends to form drainage plate in powder mixing chamber, is provided with middle supporting plate in the middle part of the wind powder mixing chamber.
2. a kind of full negative pressure drainage type air and powder mixer described in accordance with the claim 1, it is characterised in that: the wind powder mixing chamber
For the single side front and back end necking of round tube, the round tube diameter is D, and necking depth is between 0.2D-0.25D；The wind powder mixing
The necking part of room and the lower port connection of powder inlet hopper.
3. a kind of full negative pressure drainage type air and powder mixer according to claim 2, it is characterised in that: the wind powder mixing chamber
Necking part cross-sectional height be H, the middle supporting plate be plate, be horizontally placed on the necking part of wind powder mixing chamber cut
Face heightPlace.
4. a kind of full negative pressure drainage type air and powder mixer described in accordance with the claim 3, it is characterised in that: the material of the middle supporting plate
Material uses 316L stainless steel.
5. a kind of full negative pressure drainage type air and powder mixer described in accordance with the claim 1, it is characterised in that: the inlet air plenum is circle
The pipe outlet connection of cylinder structure, inlet air plenum front end and blower, inlet air plenum rear end and wind powder mixing chamber front end connection.
6. a kind of full negative pressure drainage type air and powder mixer described in accordance with the claim 1, it is characterised in that: the powder inlet hopper lower end
With 50-80 angle tilt, the top connection of powder inlet hopper lower end and wind powder mixing chamber, the powder falling pipeline connection of powder inlet hopper upper end and powder cabin
It is logical.
7. a kind of full negative pressure drainage type air and powder mixer according to claim 6, it is characterised in that: the drainage board width
With lower end of hopper equivalent width, it is consistent with powder inlet hopper lower end tilt angle to go deep into angle；The drainage plate length is in 2cm-5cm
Between.
8. a kind of full negative pressure drainage type air and powder mixer described in accordance with the claim 1, it is characterised in that: the discharge chamber is circle
Cylinder structure, the rear end connection of discharge chamber front end and wind powder mixing chamber, the duff pipe connection of discharge chamber rear end and burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820503551.3U CN208295947U (en) | 2018-04-10 | 2018-04-10 | A kind of full negative pressure drainage type air and powder mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820503551.3U CN208295947U (en) | 2018-04-10 | 2018-04-10 | A kind of full negative pressure drainage type air and powder mixer |
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| Publication Number | Publication Date |
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| CN208295947U true CN208295947U (en) | 2018-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820503551.3U Active CN208295947U (en) | 2018-04-10 | 2018-04-10 | A kind of full negative pressure drainage type air and powder mixer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111097299A (en) * | 2019-12-26 | 2020-05-05 | 煤科院节能技术有限公司 | Pressure regulating mixer |
-
2018
- 2018-04-10 CN CN201820503551.3U patent/CN208295947U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111097299A (en) * | 2019-12-26 | 2020-05-05 | 煤科院节能技术有限公司 | Pressure regulating mixer |
| CN111097299B (en) * | 2019-12-26 | 2022-03-15 | 煤科院节能技术有限公司 | Pressure regulating mixer |
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