CN102927919A - Measurement device for tangent circle diameter of fuel nozzle of power station boiler and measurement method thereof - Google Patents

Abstract

The invention discloses a measurement device for the tangent circle diameter of the fuel nozzle of a power station boiler and a measurement method thereof. The measuring device mainly comprises a rectangular steel plate, an infrared generator and a level gauge, wherein clamping grooves are processed on the longitudinal center line and bottom left position of the rectangular steel plate and used for the fixed installation of the infrared generator and the level gauge. According to the invention, a target distance can be accurately measured by utilizing the characteristics of infrared visibility and good positioning, and the theoretical tangent circle diameter can be obtained through simpler geometric calculation. The measurement method disclosed by the invention has the advantages of simple device, few measurement parameter and high accuracy. At present, the device and the calculation method are already successfully applied to the measurement of the theoretical tangent circle in the boilers of generator sets of multiple thermal power companies, and the accuracy and the reliability of measurement data are proved through an operating data result.

Description

Station boiler burner tangential circle diameter measurement mechanism and measuring method

Technical field

The present invention relates to a kind of station boiler burner tangential circle diameter measurement mechanism and measuring method.

Background technology

The theoretical tangential circle diameter of station boiler burner is the important design parameter of fired power generating unit safety and economic operation, and its numerical values recited is directly connected to the concrete distribution of Furnace Aerodynamic Field, and then has influence on the combustion case in the whole stove.

Theoretical tangential circle diameter increases, and the stove internal combustion is had following advantage: 1) spinning momentum increases, and disturbance is strong, and is favourable to the after-flame of fuel; 2) flame kernel is near a tuyere, and the ignition condition of coal dust is good; 3) the burner hearth degree of filling is good, and the burner hearth utilization factor is high, and the water-cooling wall heat-transfer effect is strengthened.

But the problem that the theoretical tangential circle diameter of burner brings when excessive has: 1) diameter of actual tangent circle increases, and adherent wind speed raises, and high-temperature flue gas easily pastes wall and causes coking; 2) yielding, the overtemperature of burner burns out; 3) weak wind district, burner hearth center is excessive, and the combustion space utilization factor is reduced; 4) because initial swirl strength is large, the rate of decay reduces, and makes furnace outlet remainder reverse increase, and is unfavorable to preventing the furnace outlet gas temperature deviation.

When the theoretical tangential circle diameter of burner reduces, can have a negative impact to the stability of burning, relatively comprehensive, need to determine appropriate tangential circle diameter for Coal rank, the different type of furnace.Present stage, owing to tangential circle diameter designs or adjusts the incorrect unit safety accident that causes and emerge in an endless stream, brought huge hidden danger for the safety in production of electric power enterprise.

For a long time, theoretical tangential circle diameter adopts the method for conventional pull wires always, and the method need to be hung vertical line at furnace roof, and in the measurement plane backguy, workload is large; And influence factor is many, and measurement data is coarse, and error is large, therefore, demands in the industry occurring a kind of simply accurately measuring method urgently.Paper " experimental study of adopting laser technology that burner is proofreaied and correct " is mentioned a kind of method that adopts the distance of measuring between vertical and horizontal two bundle laser to obtain the imaginary circle diameter, the deficiency that the method exists: 1) adopt the method for conventional pull wires to determine burner hearth plane geometry center, accuracy is lower; 2) need to measure two distances of restrainting between the different directions laser, operation easier is high, and cumulative errors is large; 3) measuring equipment is complicated, and workload is larger.

Therefore, invent a kind of simple, Apparatus and method for is accurately measured theoretical tangential circle diameter in the stove reliably, and unit safety, stable, economical operation are had positive directive significance.

Summary of the invention

Purpose of the present invention is exactly in order to address the above problem, and a kind of station boiler burner tangential circle diameter measurement mechanism and measuring method are provided, and it has, and device is simple, and measurement parameter is few, the advantage that accuracy is high.

To achieve these goals, the present invention adopts following technical scheme:

A kind of station boiler burner tangential circle diameter measurement mechanism comprises rectangular steel plates, infrared generator, level meter; Described infrared generator is installed in the draw-in groove of rectangular steel plates surface longitudinal center line; Described level meter is installed in one jiao the draw-in groove on rectangular steel plates surface.

The measuring method of above-mentioned a kind of station boiler burner tangential circle diameter measurement mechanism is divided into following concrete steps:

Step (1) places station boiler burner tangential circle diameter measurement mechanism in the burner cylinder; Described burner cylinder is positioned over four angles of burner hearth;

Step (2) is opened infrared generator;

Step (3), the distance of measurement infrared ray drop point and diagonal angle wall line;

Step (4) is set up the section of burner hearth rectangular coordinate system and is made boost line, according to known size of burner hearth and measurement data, tries to achieve theoretical tangential circle diameter by calculating.

The rectangular steel plates of described step (1) horizontal positioned in the burner cylinder, rectangular steel plates edge and cylinder inner wall are seamless.

The infrared ray that the infrared generator of described step (2) sends overlaps with the rectangular steel plates longitudinal midline.

The computing method of described step (4) are:

The infrared ray that infrared generator sends is from burner hearth one angle, and infrared ray is mapped on the furnace wall N on opposite through some E, measures the length (see figure 2) of the target range MN of opposite furnace wall.Then, according to known size of burner hearth and unique measurement data MN, by a series of calculating, try to achieve the theoretical tangential circle diameter of burner, concrete method for solving is:

Known size of burner hearth and measurement data: furnace width AB=CD=a, burner hearth length BC=DA=b, measurement data MN=c, four jiaos is congruent equilateral right-angle triangle, its right-angle side length BM=BG=d, E, F, H are respectively the mid point of triangle line, cross the vertical line that O, 2 of P do OR, PQ limit, cross H, P, 3 vertical lines of doing the BC limit of F.

Ask theoretical tangential circle diameter 2OR, OR is the radius of the theoretical circle of contact of burner.

Circular is as follows:

Set up rectangular coordinate system take an E as initial point

Be respectively by the coordinate that can be calculated 2 of N, O

Straight-line equation by 2 of E, N is $(b-c-\frac{3d}{2})x-(a-\frac{d}{2})y=0---\left(1\right)$

X, y are independent variable.So, theoretical tangential circle diameter is

$2\mathrm{OR}=2|(b-c-\frac{3d}{2})*\left(\frac{a-d}{2}\right)-(a-\frac{d}{2})*\left(\frac{b-d}{2}\right)|/\sqrt{{(b-c-\frac{3d}{2})}^2+{(a-\frac{d}{2})}^2}---\left(2\right)$

Also can triangle is similar try to achieve theoretical tangential circle diameter by adopting, for

$2\mathrm{OR}=2\mathrm{EO}*\mathrm{PQ}/\mathrm{EP}=[\frac{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="HDA00002325071900011.png"\; state="\{\{state\}\}">d</figure-callout>}}{2}+c+\frac{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="HDA00002325071900011.png"\; state="\{\{state\}\}">d</figure-callout>}}{2}*(b-c-\frac{3d}{2})/(a-\frac{d}{2})]*(a-d)/$

（3）

$\sqrt{{(a-d)}^2+{[(a-d)*(b-c-\frac{3d}{2})/(a-\frac{d}{2})]}^2}$

Beneficial effect of the present invention: provide appropriate tangential circle diameter for Coal rank, the different type of furnace, device is simple, and measurement parameter is few, and accuracy is high.Minimizing is pasted the slagging failure that wall causes because of high-temperature flue gas; The minimizing burner is yielding, overtemperature burns out accident; Make weak wind district, burner hearth center suitable, the combustion space utilization factor is improved; Stopped because initial swirl strength is large, and the rate of decay reduces, the furnace outlet remainder that causes reverses and increases and furnace outlet gas temperature deviation adverse effect.Easily accurately locate at burner hearth plane geometry center; Do not need to measure the distance between multiple laser, simple to operate, measuring equipment is simple, and workload is less.

Description of drawings

Fig. 1 is the measurement mechanism schematic diagram;

Fig. 2 is section of burner hearth and computing method schematic diagram;

Wherein, 1, rectangular steel plates, 2, infrared generator, 3, level meter, 4, infrared ray.

Embodiment

The invention will be further described below in conjunction with accompanying drawing and embodiment.

As shown in Figure 1, a kind of station boiler burner tangential circle diameter measurement mechanism comprises rectangular steel plates 1, infrared generator 2, level meter 3; Described infrared generator 2 is installed in the draw-in groove of rectangular steel plates 1 surface longitudinal center line; Described level meter 3 is installed in one jiao the draw-in groove on rectangular steel plates 1 surface.The infrared ray 4 that described infrared generator 2 sends overlaps with rectangular steel plates 1 longitudinal midline.

Comparatively serious coking phenomenon occurs in certain 3# of genco unit, occured in the short period of time two and fallen burnt fire-putting-out emergency, serious threat the safety of unit and grid equipment.Company has set up immediately expert group culprit has been analyzed, through being discussed, expert group for Boiler Operation and device structure etc. 5 possible causes have been proposed, wherein a kind of possible cause is that tangential circle diameter is excessive and adherent wind speed that cause is higher, and high-temperature flue gas attaches coal dust, lime-ash pastes wall and causes coking.For thoroughly understanding fully culprit, maintenance directorate determine to measure the theoretical tangential circle diameter of burner in the stove during the unit light maintenance.

Known size of burner hearth is a=10240mm, b=11360mm, d=280mm, and field survey target length c=395mm asks the theoretical tangential circle diameter of this burner.

A, b, the concrete numerical value difference substitution formula (2) of c, d (3) can be got

$2\mathrm{OR}=2|(11360-395-\frac{3*280}{2})*\left(\frac{10240-280}{2}\right)-(10240-\frac{280}{2})*\left(\frac{11360-280}{2}\right)|/$

$\sqrt{{(11360-395-\frac{3*280}{2})}^2+{(10240-\frac{280}{2})}^2}=471.2\mathrm{mm}$

$2\mathrm{OR}=[\frac{280}{2}+395+\frac{280}{2}*(11360-395-\frac{3*280}{2})/(10240-\frac{280}{2})]*(10240-280)/$

$\sqrt{{(10240-280)}^2+{[(10240-280)*(11360-395-\frac{3*280}{2})/(10240-\frac{280}{2})}^2}=471.2\mathrm{mm}$ And the theoretical tangential circle diameter of the burner of boiler producer design is 400-450mm, and the numerical value of actual measurement is obviously greater than design load, preliminary identification before measuring to the deduction of culprit.Therefore, the workmen has carried out suitable adjustment to the burner angle between turn(a)round, makes theoretical tangential circle diameter be stabilized in 415mm.

The 3# unit starting is continuously safe operation four months so far, and burner hearth coking situation has clear improvement.

Although above-mentionedly by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.

Claims (5)

1. a station boiler burner tangential circle diameter measurement mechanism is characterized in that, comprises rectangular steel plates, infrared generator, level meter; Described infrared generator is installed in the draw-in groove of rectangular steel plates surface longitudinal center line; Described level meter is installed in one jiao the draw-in groove on rectangular steel plates surface.

2. a kind of station boiler burner tangential circle diameter measurement mechanism as claimed in claim 1 is characterized in that, described rectangular steel plates is horizontal positioned in the burner cylinder, and rectangular steel plates edge and cylinder inner wall are seamless.

3. a kind of station boiler burner tangential circle diameter measurement mechanism as claimed in claim 1 is characterized in that, the infrared ray that described infrared generator sends overlaps with the rectangular steel plates longitudinal midline.

4. such as the measuring method of claim 1 or 2 or 3 described a kind of station boiler burner tangential circle diameter measurement mechanisms, it is characterized in that, described concrete steps are as follows:

Step (1) places station boiler burner tangential circle diameter measurement mechanism in the burner cylinder; Described burner cylinder is positioned over four angles of burner hearth;

Step (2) is opened infrared generator;

Step (3), the distance of measurement infrared ray drop point and diagonal angle wall line;

Step (4) is set up the section of burner hearth rectangular coordinate system and is made boost line, according to known size of burner hearth and measurement data, tries to achieve theoretical tangential circle diameter by calculating.

5. a kind of station boiler burner tangential circle diameter measuring method as claimed in claim 2 is characterized in that, the computing method of described step (4) are:

The infrared ray that infrared generator sends is from burner hearth one angle, infrared ray is mapped on the furnace wall N on opposite through an E, measure the length of the target range MN of opposite furnace wall, then, according to known size of burner hearth and unique measurement data MN, by a series of calculating, try to achieve the theoretical tangential circle diameter of burner, concrete method for solving is:

Known size of burner hearth and measurement data: furnace width AB=CD=a, burner hearth length BC=DA=b, measurement data MN=c, four jiaos is congruent equilateral right-angle triangle, its right-angle side length BM=BG=d, E, F, H are respectively the mid point of triangle line, cross the vertical line that O, 2 of P do OR, PQ limit, cross H, P, 3 vertical lines of doing the BC limit of F, ask theoretical tangential circle diameter 2OR;

Circular is as follows:

Set up rectangular coordinate system take an E as initial point

Be respectively by the coordinate that calculates 2 of N, O

Straight-line equation by 2 of E, N is $(b-c-\frac{3d}{2})x-(a-\frac{d}{2})y=0---\left(1\right)$

So, theoretical tangential circle diameter is

$2\mathrm{OR}=2|(b-c-\frac{3d}{2})*\left(\frac{a-d}{2}\right)-(a-\frac{d}{2})*\left(\frac{b-d}{2}\right)|/\sqrt{{(b-c-\frac{3d}{2})}^2+{(a-\frac{d}{2})}^2}---\left(2\right)$

Adopt that triangle is similar tries to achieve theoretical tangential circle diameter, for

$2\mathrm{OR}=2\mathrm{EO}*\mathrm{PQ}/\mathrm{EP}=[\frac{d}{2}+c+\frac{d}{2}*(b-c-\frac{3d}{2})/(a-\frac{d}{2})]*(a-d)/$

（3）

$\sqrt{{(a-d)}^2+{[(a-d)*(b-c-\frac{3d}{2})/(a-\frac{d}{2})]}^2}.$

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