CN104864403B - Equalizing regulation device of boiler coal powder - Google Patents

Abstract

An equalizing regulation device of boiler coal powder is used for the direct firing pulverizing system of thermal power plants. The device comprises a plurality of regulating units, wherein the plurality of regulating units are respectively arranged between distributor outlet pipes; each regulating unit comprises an inner regulating plate, an outer regulating plate, an inner regulating spindle and an outer regulating spindle; each inner regulating spindle and the corresponding outer regulating spindle are coaxially arranged; each inner regulating plate is arranged on the corresponding inner regulating spindle; each outer regulating plate is arranged on the corresponding outer regulating spindle; each inner regulating plate comprises an upper part and a lower part which are positioned on the same plane, and each outer regulating plate comprises an upper part and a lower part which are positioned on the same plane; each inner regulating plate and the corresponding outer regulating plate are arranged in zones with different coal powder concentration and fineness and can be used for adjustment independently. By regulating the angles of the two regulating plates, the device can realize the equalizing regulation of coal powder quantity and coal powder fineness, and original air volume regulation cannot be affected during the regulation of coal powder quantity.

Description

A kind of boiler coal-ash well-balanced adjustment device

Technical field

The present invention relates to a kind of boiler coal-ash well-balanced adjustment device, more particularly to a kind of direct-firing suitable for thermal power plant Coal dust well-balanced adjustment device in pulverized coal preparation system.

Background technology

Modern large-sized boiler mostly adopts unit pulverized-coal system, and generally every coal pulverizer need to be to one burner layer of boiler First air is provided, and each burner layer generally there are 4, even there are 8 burners sometimes.The effect of pulverized coal distributor is to grind Band powder air-flow after the completion of the grinding of coal machine is evenly distributed in some primary air ducts and burner, and its performance is to burner, pot The safety and economic operation of stove etc. plays an important role.

Wind powder ratio between each pulverized coal channel is unbalanced will to cause many problems.When pulverized coal channel apoplexy coal ratio is less than During design load, unburned carbon in flue dust will be caused to increase, the phenomenon such as slagging scorification phenomenon is serious and thermic load efficiency is reduced；Conversely, working as coal When powder pipeline apoplexy coal ratio is higher than design load, then can cause the increase of thermal NO x；Therefore, the peace improved by boiler operatiopn Full property and economy, while meeting increasingly stricter environmental requirement, must ensure dividing with breeze airflow between each burner With uniformity.

There is various ways in the uneven of coal pulverizer exit coal dust：The uneven of air quantity, the uneven and powder amount of powder amount Fineness it is uneven.In boiler controller system, the distribution of the balanced air quantity of pulverized coal distributor and coal dust can be typically configured.But with existing For the maximization of boiler controller system, unbalanced problem is increasingly severe.Traditional allotter can not increasingly meet actual demand. Then, many technologies that well-balanced adjustment is carried out to air quantity and powder amount are occurred in that.

Air quantity and the unbalanced reason of coal dust amount are diverse.The unbalanced reason of air quantity is mainly allotter and respectively goes out The difference of the resistance coefficient between mouth pipeline, and the unbalanced reason of coal dust amount is the intrinsic unsymmetric structure of coal pulverizer.Current wind The regulation of amount is realized by methods such as adjustable contractions, and comparative maturity, but the regulation of a coal dust amount always difficult problem.

U.S. Patent Publication Document a kind of coal dust amount dispensing controller (notification number US20120243969), the controller By moving up and down for the baffle plate fragment that is circular layout, the regulation of the coal dust amount of each arm is realized, but its adjustable plate and corresponding Export distributor pipe correspondence it is poor, showing as practical operation, to adjust process uncontrollable, and fineness of pulverized coal can not be carried out Adjust.

A kind of coal dust amount equilibrium adjusting apparatus (notification number of pipeline distributor of U.S. Patent Publication Document US20050042043), the device is made up of a series of adjustable plate in horizontally movable droplet-like sections, by adjustable plate Move horizontally, realize the regulation of the distribution of coal dust amount.The device obtains certain effect on pipeline distributor, but in coal pulverizer point Regulating effect on orchestration is very undesirable.And fineness of pulverized coal can not be adjusted.

The content of the invention

It is an object of the invention to provide a kind of coal powder amount regulator being mainly used on coal pulverizer allotter so as to can Make powder amount and the distribution of powder amount fineness balanced simultaneously, and the regulation of original air quantity will not be impacted.

Technical scheme is as follows：

A kind of boiler coal-ash well-balanced adjustment device, it is characterised in that：The device contains multiple adjustment units, multiple regulation lists Unit is separately positioned between export distributor pipe；Each adjustment unit includes interior adjustable plate, outer adjustable plate, interior adjustment axis and investigation mission outside the city or town Nodal axisn；Interior adjustment axis are coaxially arranged with outer adjustment axis, and two axles pass through intermediate support and end support saddle is installed and fixed, intermediate support It is separately mounted on allotter and coal spout with end support saddle；The interior adjustable plate is arranged in interior adjustment axis, the outer regulation Plate is arranged in outer adjustment axis；Interior adjustable plate and outer adjustable plate are respectively divided into upper and lower two parts, and respective upper and lower two parts position On same plane.

Preferably, each described adjustment unit is installed on the middle position between two neighboring export distributor pipe.

Preferably, the upper edge of the interior adjustable plate and outer adjustable plate is gone out for allotter with the vertical dimension of allotter upper surface 0.1～1.5 times of mouth pipe diameter.

The another of the present invention is technically characterized in that：By the horizontal length of interior adjustable plate, the horizontal length of outer adjustable plate, transfer to other localities Length of the level interval and outer adjustment axis of the level interval of section plate and coal spout, interior adjustable plate and outer adjustable plate in inner skeleton Degree is set to L1, L2, d1, d2 and LN, has following relation between them：

The another of the present invention is technically characterized in that：It is provided with one end away from coal spout of interior adjustment axis and outer adjustment axis For the angle scale of vision-control plate angle.

The invention has the advantages that and salience technique effect：1. employ the structure of double adjustable plates so that the dress Putting can be while carries out the well-balanced adjustment of coal dust amount and fineness of pulverized coal.2. interior adjustable plate and outer adjustable plate are from the vertical of allotter upper surface The enough distances of straight distance setting, using the greatest differences of inertia between air and coal dust so that when coal dust amount adjusts operation, no Existing air quantity can be adjusted and be impacted.

Description of the drawings

Structure and its schematic view of the mounting position in allotter of the Fig. 1 for boiler coal-ash well-balanced adjustment device embodiment.

Top views of the Fig. 2 for Fig. 1.

Structural representations (sectional view) of the Fig. 3 for adjustment unit.

3 D stereo schematic diagrams of the Fig. 4 for adjustment unit.

In figure：1- adjustment units；2- allotters；3- export distributor pipes；4- end support saddles；The outer adjustable plates of 5-；Adjust in 6- Section plate；The outer adjustment axis of 7-；Adjustment axis in 8-；9- intermediate supports；10- angle scales；11- coal spouts；The first export distributors of 301- Pipe；302- the second export distributor pipes；303 the 3rd export distributor pipes；The 4th export distributor pipes of 304-；101- first is adjusted Unit；The second adjustment units of 102-；103 the 3rd adjustment units；The 4th adjustment units of 104-.

Specific embodiment

The theory structure and specific embodiment of the present invention are described in detail below in conjunction with accompanying drawing.

Structure and its schematic view of the mounting position in allotter of the Fig. 1 for boiler coal-ash well-balanced adjustment device, the device Containing multiple adjustment units 1, multiple adjustment units are separately positioned between export distributor pipe 3；In each adjustment unit includes Adjustable plate 6, outer adjustable plate 5, interior adjustment axis 8 and outer adjustment axis 7；Interior adjustment axis 8 are coaxially arranged with outer adjustment axis 7, and two axles are logical Cross intermediate support 9 and end support saddle 4 is installed and fixed, intermediate support 9 and end support saddle 4 are separately mounted to allotter 2 and coal spout On 11；Interior adjustable plate 6 is arranged in interior adjustment axis 8, and outer adjustable plate 5 is arranged in outer adjustment axis 7；Interior adjustable plate 6 and outer regulation Plate 5 is respectively divided into upper and lower two parts, and respective upper and lower two parts are in the same plane.

Top views of the Fig. 2 for Fig. 1, allotter have 4 outlets, and each adjustment unit is installed on two neighboring allotter and goes out Middle position between mouth pipe 3.The angle of interior adjustable plate 6 and outer adjustable plate 5 can be only by interior adjustment axis 8 and outer adjustment axis 7 It is vertical to be adjusted.Structural representations of the Fig. 3 for adjustment unit, 3 dimensional drawings of the Fig. 4 for adjustment unit.

The horizontal length for setting interior adjustable plate respectively is L2, outer adjustable plate and coal spout as the horizontal length of L1, outer adjustable plate Horizontal range be d1, the level interval of interior adjustable plate and outer adjustable plate be the length of d2 and outer adjustment axis in inner skeleton For LN, between them, there is following relation：

In order to when the deviation of coal dust amount is adjusted, not impact to original air quantity difference, interior adjustable plate 6 and outer regulation The vertical dimension of the upper edge of plate 5 and 2 upper surface of allotter is preferably 0.2 times of export distributor pipe diameter.

The angle scale for vision-control plate angle is installed away from coal spout one end in interior adjustment axis and outer adjustment axis 10, inside and outside two adjustable plates can independent regulation angle；Due to the coal powder density in region residing for two adjustable plates it is different with fineness, institute So that the adjustment of coal dust amount and fineness of pulverized coal can be realized by adjusting the different angles of two adjustable plates.Such as, due to interior regulation Residing for plate 6, the coal powder density in region is larger, it is possible to mainly with interior adjustable plate come the balanced adjustment unit close to two points The coal dust amount of orchestration outlet 3；And the fineness of coal dust is adjusted with outer adjustable plate.The equilibrium of air quantity is by extra adjustable contracting Hole is carried out in a balanced way.Due to the inertia of air it is very little, as long as through certain distance, impact of the adjustable plate to air quantity can be ignored Disregard, so as to air quantity does not result in negative impact in a balanced way.

Newest research shows, for diffusion type coal powder allotter, air flow to down and up enters allotter while having Certain tangential velocity.Pulverized coal particle follows air-flow to enter allotter, as inertia is larger, can deviate the flow trace of air. In inner skeleton, outer dilute interior dense coal dust amount distribution and outer thin interior thick fineness of the particles point state can be generally presented.The present invention Two adjustable plates one be in the dense and thick environment of coal dust, one in the dilute and thin environment of coal dust.Two adjustable plates can be only The vertical regulation for carrying out angle.So the angle by adjusting two adjustable plates, just can realize coal dust amount and fineness of pulverized coal simultaneously Well-balanced adjustment.

The regulation process of the present invention is as follows：

Referring to Fig. 1 and Fig. 2, the initial position of this boiler coal-ash well-balanced adjustment device is：Plane residing for controllable register with Horizontal plane；Now by measurement, the coal dust amount deviation and fineness of pulverized coal deviation of each export distributor pipe are obtained.Four go out It is in charge of respectively the first export distributor pipe 301, the second export distributor pipe 302, the 3rd export distributor pipe 303 and the 4th point Orchestration outlet 304；The coal dust amount deviation of four outlets is respectively：+ 5%, -5%, 0%, 0%；The coal dust of four outlets Fineness deviation is respectively：+ 3%, -3%, 0%, 0%.That is, unbalanced all occur in 301 He of the first export distributor pipe Between second export distributor 302, and the uneven uneven measurement weighed more than fineness of concentration.

The outer controllable register of the first adjustment unit 101 is rotated 45 degree by the first step counterclockwise so as to outer controllable register it is upper Edge is close to the first export distributor pipe 301, and the lower edge of outer controllable register is close to the second export distributor pipe 302.Transfering to other localities Under the guiding of section plate, more coal dusts enter the first export distributor pipe 301 so that the coal powder density of four export distributor pipes Basically identical, deviation tends to 0%.At this moment the fineness of pulverized coal of four outlets deviation become in order to：- 2% ,+2%, 0%, 0%. That is, after the first successive step, outer controllable register is in the region that fineness is big and concentration is big, so fineness deviation there occurs Large change.The interior controllable register of the first adjustment unit 101 is rotated 15 degree by second step clockwise.Interior controllable register is by one Divide subdivision guiding to the second export distributor pipe 302, final fineness of pulverized coal reaches unanimity.And the adjustment of second step, it is dense to coal dust The impact of degree only about 1%.That is, after the adjustment of above-mentioned two step, the coal dust of four export distributor pipes Measuring deviation is respectively：+ 1%, -1%, 0%, 0%；The fineness of pulverized coal deviation of four export distributor pipes is respectively：0%th, 0%, 0%th, 0%.If it is necessary, above-mentioned two step can also be repeated, by deviation adjustment to less scope.Finally, will be each The deviation of coal dust amount and fineness of pulverized coal between individual export distributor pipe is all adjusted in the range of acceptable.

Claims (5)

1. a kind of boiler coal-ash well-balanced adjustment device, it is characterised in that：The device contains multiple adjustment units (1), multiple regulations Unit is separately positioned between export distributor pipe (3)；Each adjustment unit (1) including interior adjustable plate (6), outer adjustable plate (5), Interior adjustment axis (8) and outer adjustment axis (7)；Interior adjustment axis (8) are coaxially arranged with outer adjustment axis (7), and two axles pass through intermediate support (9) install and fix with end support saddle (4), intermediate support (9) and end support saddle (4) are separately mounted to allotter (2) and coal spout (11) on；, in interior adjustment axis (7), the outer adjustable plate (5) is in outer adjustment axis (8) for the interior adjustable plate (6)； Interior adjustable plate (6) and outer adjustable plate (5) are respectively divided into upper and lower two parts, and respective upper and lower two parts are in the same plane.

2. a kind of boiler coal-ash well-balanced adjustment device according to claim 1, it is characterised in that：Each adjustment unit (1) The middle position being installed between two neighboring export distributor pipe (3).

3. a kind of boiler coal-ash well-balanced adjustment device according to claim 1, it is characterised in that：The interior adjustable plate (6) It is the 0.1～1.5 of export distributor pipe (3) diameter with the upper edge of outer adjustable plate (5) and the vertical dimension of allotter (2) upper surface Times.

4. a kind of boiler coal-ash well-balanced adjustment device according to claim 1,2 or 3, it is characterised in that：By interior adjustable plate Horizontal length, the horizontal length of outer adjustable plate, the level interval of outer adjustable plate and coal spout, interior adjustable plate and outer adjustable plate Level interval and outer adjustment axis are set to L1, L2, d1, d2 and LN in the length of inner skeleton, have as follows between them Relation：

$\left\{\begin{array}{c}0.2\≤\frac{L1+L2}{LN}\≤0.8\\ 0.5\≤\frac{L1}{L2}\≤2\\ \frac{d1}{LN}\≤0.2\\ d2/LN\≤0.1\end{array}\right..$

5. a kind of boiler coal-ash well-balanced adjustment device according to claim 4, it is characterised in that：In interior adjustment axis (8) and Outer adjustment axis (7) are provided with the angle scale (10) for vision-control plate angle away from one end of coal spout (11).