CN204756981U - Balanced adjusting device of boiler pulverized coal - Google Patents

Abstract

The utility model provides a balanced adjusting device of boiler pulverized coal for thermal power factory unit pulverized -coal system. The device contains a plurality of regulating unit, and a plurality of regulating unit set up respectively between the distributor outlet pipe, every regulating unit includes interior regulating plate, outer regulating plate, interior regulating spindle and outer regulating spindle, interior regulating spindle is arranged with outer regulating spindle is coaxial, including the interior regulating plate installation on the regulating spindle, outer regulating plate is installed outside on the regulating spindle, two parts about interior regulating plate is divided into respectively with outer regulating plate, and two parts lie in the coplanar about respective. Two regulating plates are arranged in the region of buggy concentration and fineness difference to can independently adjust. The angle of this device through adjusting two regulating plates, the just volume of realizing the buggy and coal fineness's equalizing control is simultaneously adjusted when operating in the volume of carrying out the buggy moreover, can not cause the influence to original air regulation.

Description

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

Technical field

The utility model relates to a kind of boiler coal-ash well-balanced adjustment device, particularly a kind of coal dust well-balanced adjustment device be applicable in the unit pulverized-coal system of thermal power plant.

Background technology

Modern large-sized boiler mostly adopts unit pulverized-coal system, and every platform coal pulverizer need provide First air to boiler burner layer usually, and each burner layer has 4 usually, sometimes even has 8 burners.The effect of pulverized coal distributor is that the band powder uniform stream after having been ground by coal pulverizer is assigned in some primary air ducts and burner, and the safety and economic operation of its performance to burner, boiler etc. plays an important role.

Wind powder ratio between each pulverized coal channel is unbalanced will cause a lot of problem.When pulverized coal channel apoplexy coal ratio is lower than design load, unburned carbon in flue dust will be caused to increase, the phenomenons such as the serious and thermic load efficiency reduction of slagging scorification phenomenon; On the contrary, when pulverized coal channel apoplexy coal ratio is higher than design load, then the increase of thermal NO x can be caused; Therefore, security and the economy of boiler operatiopn be improved, meet more and more stricter environmental requirement simultaneously, the distributing uniformity with breeze airflow between each burner must be ensured.

There is various ways in the uneven of coal pulverizer exit coal dust: the uneven and powder amount fineness of uneven, the powder amount of air quantity uneven.In boiler controller system, generally can configure the distribution of the balanced air quantity of pulverized coal distributor and coal dust.But along with the maximization of modern boiler controller system, unbalanced problem is more and more serious.Traditional distributor more and more can not practical requirement.So, there is many technology of air quantity and powder amount being carried out to well-balanced adjustment.

Air quantity and the unbalanced reason of coal dust amount are diverse.The difference of the resistance coefficient of the unbalanced reason of air quantity mainly between each export pipeline of distributor, and the unbalanced reason of coal dust amount is the intrinsic unsymmetric structure of coal pulverizer.The adjustment of current air quantity is realized by methods such as adjustable contractions, and comparative maturity, but the adjustment of coal dust amount is a difficult problem always.

American documentation literature discloses a kind of coal dust amount dispensing controller (notification number US20120243969), this controller is moved up and down by the baffle plate fragment that is circular layout, realize the adjustment of the coal dust amount of each arm, but the correspondence of its adjustable plate and corresponding export distributor pipe is poor, show as practical operation adjustment process uncontrollable, and can not regulate fineness of pulverized coal.

American documentation literature discloses a kind of balanced adjusting device (notification number US20050042043) of coal dust amount of pipeline distributor, this device is made up of the adjustable plate in a series of droplet-like cross section moved horizontally, moving horizontally by adjustable plate, realizes the adjustment of the distribution of coal dust amount.This device obtains certain effect on pipeline distributor, but regulating effect on coal pulverizer distributor is very undesirable.And can not regulate fineness of pulverized coal.

Utility model content

The purpose of this utility model is to provide a kind of coal powder amount regulator be mainly used on coal pulverizer distributor, makes it that powder amount and powder amount fineness can be made to divide balancing simultaneously, and can not impact original air quantity adjustment.

The technical solution of the utility model is as follows:

A kind of boiler coal-ash well-balanced adjustment device, it is characterized in that: this device contains multiple regulon, multiple regulon is separately positioned between export distributor pipe; Each regulon comprises interior adjustable plate, outer adjustable plate, interior regulating shaft and outer regulating shaft; Interior regulating shaft and outer regulating shaft coaxially arranged, and diaxon is installed fixing by intermediate support and end support saddle, and intermediate support and end support saddle are arranged on distributor and coal spout respectively; Described interior adjustable plate is arranged on interior regulating shaft, and described outer adjustable plate is arranged on outer regulating shaft; Interior adjustable plate and outer adjustable plate are divided into upper and lower two parts respectively, and respective two parts are up and down in the same plane.

Preferably, described each regulon is installed on the position, middle between adjacent two export distributor pipes.

Preferably, the upper edge of described interior adjustable plate and outer adjustable plate and the vertical range of distributor upper surface are 0.1 ~ 1.5 times of export distributor pipe diameter.

Another technical characteristic of the present utility model is: the level interval of the level interval of the horizontal length of the horizontal length of interior adjustable plate, outer adjustable plate, outer adjustable plate and coal spout, interior adjustable plate and outer adjustable plate and outer regulating shaft are set to L1, L2, d1, d2 and LN respectively in the length of inner skeleton, have following relation between them:

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

Another technical characteristic of the present utility model is: be provided with the angle scale for vision-control plate angle in one end away from coal spout of interior regulating shaft and outer regulating shaft.

The utility model tool has the following advantages and the technique effect of high-lighting: the structure that 1. have employed two adjustable plate, makes this device can carry out the well-balanced adjustment of coal dust amount and fineness of pulverized coal simultaneously.2. the vertical range that interior adjustable plate and outer adjustable plate separate orchestration upper surface sets enough distances, utilizes the greatest differences of inertia between air and coal dust, when making coal dust amount adjustment operation, can not regulate impact existing air quantity.

Accompanying drawing explanation

Fig. 1 is the structure of boiler coal-ash well-balanced adjustment device embodiment and the installation site schematic diagram in distributor thereof.

Fig. 2 is the top view of Fig. 1.

Fig. 3 is the structural representation (sectional view) of regulon.

Fig. 4 is the 3 D stereo schematic diagram of regulon.

In figure: 1-regulon; 2-distributor; 3-export distributor pipe; 4-end support saddle; The outer adjustable plate of 5-; Adjustable plate in 6-; The outer regulating shaft of 7-; Regulating shaft in 8-; 9-intermediate support; 10-dial; 11-coal spout; 301-first export distributor pipe; 302-second export distributor pipe; 303 the 3rd export distributor pipes; 304-the 4th export distributor pipe; 101-first regulon; 102-second regulon; 103 the 3rd regulons; 104-the 4th regulon.

Detailed description of the invention

Hereafter will describe theory structure of the present utility model and detailed description of the invention by reference to the accompanying drawings in detail.

Fig. 1 is the structure of boiler coal-ash well-balanced adjustment device and the installation site schematic diagram in distributor thereof, and this device contains multiple regulon 1, and multiple regulon is separately positioned between export distributor pipe 3; Each regulon comprises interior adjustable plate 6, outer adjustable plate 5, interior regulating shaft 8 and outer regulating shaft 7; Interior regulating shaft 8 is coaxially arranged with outer regulating shaft 7, and diaxon is installed fixing by intermediate support 9 and end support saddle 4, and intermediate support 9 and end support saddle 4 are arranged on distributor 2 and coal spout 11 respectively; Interior adjustable plate 6 is arranged on interior regulating shaft 8, and outer adjustable plate 5 is arranged on outer regulating shaft 7; Interior adjustable plate 6 and outer adjustable plate 5 are divided into upper and lower two parts respectively, and respective two parts are up and down in the same plane.

Fig. 2 is the top view of Fig. 1, and distributor has 4 outlets, and each regulon is installed on the position, middle between adjacent two export distributor pipes 3.The angle of interior adjustable plate 6 and outer adjustable plate 5 independently regulates by interior regulating shaft 8 and outer regulating shaft 7.Fig. 3 is the structural representation of regulon, and Fig. 4 is the 3 dimensional drawing of regulon.

Set respectively the horizontal length of interior adjustable plate as the horizontal length of L1, outer adjustable plate be L2, the horizontal range of outer adjustable plate and coal spout is d1, the level interval of interior adjustable plate and outer adjustable plate is d2 and outer regulating shaft is LN in the length of inner skeleton, has following relation between them:

$\left\{\begin{array}{c}\frac{L1+L2}{\mathrm{LN}}=0.6\\ \frac{L1}{L2}=1\\ \frac{d1}{\mathrm{LN}}=0.1\\ d2/\mathrm{LN}\≤0.05\end{array}\right.$

In order to when regulating the deviation of coal dust amount, do not impact original air quantity difference, upper edge and the vertical range of distributor 2 upper surface of interior adjustable plate 6 and outer adjustable plate 5 are preferably 0.2 times of export distributor pipe diameter.

Be provided with angle scale 10 for vision-control plate angle at interior regulating shaft and outer regulating shaft away from coal spout one end, inside and outside two adjustable plates can independent adjusting angle; Residing for two adjustable plates, the coal powder density in region is different with fineness, so can be realized the adjustment of coal dust amount and fineness of pulverized coal by the different angles of adjustment two adjustable plates.Such as, residing for interior adjustable plate 6, the coal powder density in region is comparatively large, so mainly can carry out the coal dust amount of two export distributor pipes 3 of this regulon balanced next-door neighbour with interior adjustable plate; And the fineness of coal dust is regulated with outer adjustable plate.The equilibrium of air quantity carries out equilibrium by extra adjustable contraction.Because the inertia of air is very little, as long as through certain distance, the impact of adjustable plate on air quantity is negligible, thus can not cause negative impact to balanced air quantity.

Up-to-date research shows, for diffusion type coal powder distributor, air flow to down and up enters distributor and have certain tangential velocity simultaneously.Pulverized coal particle is followed air-flow and is entered distributor, because inertia is comparatively large, can depart from the flow trace of air.In inner skeleton, outer rare interior dense coal dust amount distribution and outer thin interior thick grain fineness point state can be presented generally.Two adjustable plates one of the present utility model are in the dense and thick environment of coal dust, and one is in the rare and thin environment of coal dust.Two adjustable plates independently can carry out the adjustment of angle.So pass through the angle of adjustment two adjustable plates, just can realize the well-balanced adjustment of coal dust amount and fineness of pulverized coal simultaneously.

Adjustment process of the present utility model is as follows:

See Fig. 1 and Fig. 2, the initial position of this boiler coal-ash well-balanced adjustment device is the plane residing for controllable register and horizontal plane; Four go out to be in charge of and are respectively the first export distributor 301, second export distributor pipe 302, the 3rd export distributor pipe 303 and the 4th export distributor pipe 304; Now by measure, obtain coal dust amount deviation and the fineness of pulverized coal deviation of each export distributor pipe, the coal dust amount deviation of four outlets respectively :+5% ,-5%, 0%, 0%; The fineness of pulverized coal deviation of four outlets is respectively :+3% ,-3%, 0%, 0%; That is, unbalancedly all to occur between the first export distributor 301 and the second export distributor 302, and the inequality of concentration is weighed the inequality being greater than fineness and is weighed.

The first step, rotates 45 degree by the outer controllable register of the first regulon 101 counterclockwise, makes the upper edge of its outer controllable register close to the first export distributor pipe 301, and the lower edge of outer controllable register goes out to be in charge of 302 close to the second distributor.Under the guiding of adjustable plate outside, more coal dust enters the first export distributor pipe 301, and make the coal powder density of four export distributor pipes basically identical, deviation is tending towards 0%.At this moment the deviation of the fineness of pulverized coal of four outlets has become :-2% ,+2%, 0%, 0%.That is, after first step adjustment, outer controllable register is in the large and region that concentration is large of fineness, so fineness deviation there occurs larger change.Second step, rotates 15 degree by controllable register in the first regulon 101 clockwise.Part segmentation is guided to the second export distributor pipe 302 by interior controllable register, and final fineness of pulverized coal reaches unanimity.And the adjustment of second step, approximately 1% is only had to the impact of coal powder density.That is, after the adjustment of above-mentioned two steps, the coal dust amount deviation of four export distributor pipes respectively :+1% ,-1%, 0%, 0%; The fineness of pulverized coal deviation of four export distributor pipes is respectively: 0%, 0%, 0%, 0%.If necessary, two above-mentioned steps can also be repeated, by deviation adjusting to less scope.Finally, the deviation of the coal dust amount between each export distributor pipe and fineness of pulverized coal is all adjusted within the scope of acceptable.

Claims (5)

1. a boiler coal-ash well-balanced adjustment device, is characterized in that: this device contains multiple regulon (1), and multiple regulon is separately positioned between export distributor pipe (3); Each regulon (1) comprises interior adjustable plate (6), outer adjustable plate (5), interior regulating shaft (8) and outer regulating shaft (7); Interior regulating shaft (8) is coaxially arranged with outer regulating shaft (7), and diaxon is installed fixing by intermediate support (9) and end support saddle (4), intermediate support (9) and end support saddle (4) are arranged on distributor (2) and coal spout (11) respectively; Described interior adjustable plate (6) is arranged on interior regulating shaft (7), and described outer adjustable plate (5) is arranged on outer regulating shaft (8); Interior adjustable plate (6) and outer adjustable plate (5) are divided into upper and lower two parts respectively, and respective two parts are up and down in the same plane.

2. a kind of boiler coal-ash well-balanced adjustment device according to claim 1, is characterized in that: each regulon (1) is installed on the position, middle between adjacent two export distributor pipes (3).

3. a kind of boiler coal-ash well-balanced adjustment device according to claim 1, is characterized in that: upper edge and the vertical range of distributor (2) upper surface of described interior adjustable plate (6) and outer adjustable plate (5) are 0.1 ~ 1.5 times of export distributor pipe (3) diameter.

4. a kind of boiler coal-ash well-balanced adjustment device according to claim 1,2 or 3, it is characterized in that: the level interval of the level interval of the horizontal length of the horizontal length of interior adjustable plate, outer adjustable plate, outer adjustable plate and coal spout, interior adjustable plate and outer adjustable plate and outer regulating shaft are set to L1, L2, d1, d2 and LN respectively in the length of inner skeleton, between them, have following relation:

。

5. a kind of boiler coal-ash well-balanced adjustment device according to claim 4, is characterized in that: be provided with the angle scale (10) for vision-control plate angle at interior regulating shaft (8) and outer regulating shaft (7) away from one end of coal spout (11).