CN105546569B - A kind of pulverized coal distributor of adjustable wind speed and coal powder density - Google Patents

A kind of pulverized coal distributor of adjustable wind speed and coal powder density Download PDF

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Publication number
CN105546569B
CN105546569B CN201610004873.9A CN201610004873A CN105546569B CN 105546569 B CN105546569 B CN 105546569B CN 201610004873 A CN201610004873 A CN 201610004873A CN 105546569 B CN105546569 B CN 105546569B
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CN
China
Prior art keywords
coal
regulating valve
light phase
phase
concentrated
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CN201610004873.9A
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Chinese (zh)
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CN105546569A (en
Inventor
周文台
何翔
曹建文
杨勇
魏增涛
孟永杰
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上海发电设备成套设计研究院
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Priority to CN201610004873.9A priority Critical patent/CN105546569B/en
Publication of CN105546569A publication Critical patent/CN105546569A/en
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Publication of CN105546569B publication Critical patent/CN105546569B/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23KFEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02Pneumatic feeding arrangements, i.e. by air blast
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23KFEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2203/00Feeding arrangements
    • F23K2203/20Feeding/conveying devices
    • F23K2203/201Feeding/conveying devices using pneumatic means

Abstract

The invention provides a kind of adjustable wind speed and the pulverized coal distributor of coal powder density, including with the light phase inner tube for being located in coal pulverizer outlet coal dust cylinder interior, concentrated phase outer toroid is formed between light phase inner tube and coal pulverizer outlet coal dust cylinder barrel;Tube section and concentrated phase outer toroid section are all coaxially divided into light phase is connected with a primary air piping respectively with the same number of number of the primary air piping, every equal partial cross-section, and is respectively equipped with light phase regulating valve and concentrated phase regulating valve on every equal partial cross-section.Rotating vane is provided with the reducer pipe of coal pulverizer outlet coal dust cylinder front end, reducer pipe front end is provided with louver rings.Coal pulverizer outlet coal dust is concentrated twice by louver rings and rotating vane, under effect of inertia, twice after air-coal separating, thick coal culm is concentrated in outer toroid, thin powdered coal is distributed in interior annular, then deep or light phase is all divided equally, it is corresponding to be mixed into primary air piping per a bias pulverized coal, it is evenly distributed;And regulating valve is set to the deep or light phase of every portion, convenient regulation.

Description

A kind of pulverized coal distributor of adjustable wind speed and coal powder density

Technical field

The present invention relates to a kind of thermal power plant pulverized coal distributor, more particularly to one kind can be same coal pulverizer each one Secondary airduct evenly distributes the pulverized coal distributor of air quantity and coal powder density.

Background technology

Pulverized coal distributor typically applies on the main pulverized coal channel of coal pulverizer outlet, passes through the distribution of pulverized coal distributor, energy Enough play the purpose that air quantity and coal dust amount are evenly distributed for same each primary air piping of coal pulverizer.

Whether coal pulverizer exports each primary air piping coal powder distribation uniformly larger to the combustion effects of boiler.When coal distributes inequality When, the coal dust amount for actually entering each burner differs larger, wind powder proportioning easily occurs and mismatches, causes burning tissues to deteriorate. Following influence can be caused on boiler:

(1) thermal deviation

Because the deviation of coal dust powder amount is present, boiler local heat load deviation can be caused larger, in turn result in boiler furnace The thermal deviation of outlet.

(2) local overheating and high temperature corrosion

Because the deviation of coal dust powder amount is present, regional area wind coal proportion can be caused to lack of proper care, the big region of powder amount is negative because of heat Lotus is higher, easily causes local water screen tube overtemperature.In addition, high powder amount region easily causes oxygen amount deficiency, reducing atmosphere is serious, High temperature corrosion can be caused for a long time.

(3) burn insufficient

Because the deviation of coal dust powder amount is present, local wind's powder can be caused to mismatch:The big region of powder amount and air quantity then differs Fixed big, this will result in ischaemia, have very big restriction to the after-flame of coal dust.

(4) varying duty steam temperature Steam Pressure Fluctuation

Because the deviation presence of coal dust powder amount can cause the mixing of wind powder uneven, easily causing local ignition time in stove differs, Burning tissues deteriorate, and can cause the fluctuation of steam temperature, vapour pressure and combustion chamber draft.

As described above, pulverized coal distributor is very big to the combustion effects of boiler, still, many power plant do not install coal but at present Powder distributor, because, pulverized coal distributor in the market is grid type or yi word pattern, as shown in figure 1, i.e. coal powder distribation Each primary air piping of device outlet, which is presented, from left to right to be arranged, and coal pulverizer outlet coal powder density is due to flow rotation inside coal pulverizer And the relation such as local resistance, it will usually the larger situation of left and right sides coal powder density deviation occur, i.e., left (right side) side coal powder density is The situation of the several times of right (left side) side coal powder density, so, even the pulverized coal distributor equipped with grid type or yi word pattern, it is also difficult to Each primary air piping powder amount and the purpose of wind speed equilibrium are reached by regulation.To sum up, because traditional coal dust dispenser designs do not consider The situation larger to left and right sides coal powder density deviation, therefore, traditional pulverized coal distributor modulability in practice is poor.

The content of the invention

Can be that same each primary air piping of coal pulverizer evenly distributes the technical problem to be solved in the present invention is to provide one kind Air quantity and coal powder density, and the pulverized coal distributor that modulability is strong, resistance is small.

In order to solve the above-mentioned technical problem, the technical scheme is that providing a kind of adjustable wind speed and coal powder density Pulverized coal distributor, on coal pulverizer outlet conduit, coal pulverizer outlet is provided with primary air piping, it is characterised in that:Including coaxially setting In the light phase inner tube of coal pulverizer outlet coal dust cylinder interior, formed between light phase inner tube and coal pulverizer outlet coal dust cylinder barrel dense Phase outer toroid;Tube section and concentrated phase outer toroid section are all coaxially divided into and the same number of part of the primary air piping in light phase Number, be connected respectively with a primary air piping per equal partial cross-section, and per equal partial cross-section on be respectively equipped with light phase regulating valve and dense Phase regulating valve.

Preferably, one end connecting reducing pipe one end that coal pulverizer outlet coal dust cylinder exports away from coal pulverizer, reducing The pipe other end is provided with louver rings;Rotating vane is provided with reducer pipe.

Preferably, the rotating vane can be set 12~24 altogether.

Preferably, the rotating speed of the rotating vane is adjusted by rotating controlled motor.

Preferably, the light phase inner tube equivalent diameter is that coal pulverizer exports 0.6~0.85 times of coal dust cylinder.

Preferably, the light phase regulating valve connects light phase regulating valve connecting rod, and light phase can be adjusted by light phase regulating valve connecting rod Section valve is operated.

Preferably, the concentrated phase regulating valve connection concentrated phase regulating valve connecting rod, can be adjusted by concentrated phase regulating valve connecting rod to concentrated phase Section valve is operated.

Preferably, the light phase regulating valve can shielded area be no more than the light phase inner tube often divide equally sectional area 40%, The concentrated phase regulating valve can shielded area also be no more than the concentrated phase outer toroid often divide equally sectional area 40%.

Preferably, the structure of the concentrated phase regulating valve and light phase regulating valve is folding " covering of the fan " type structure.

The principle of pulverized coal distributor provided by the invention is:The coal dust of coal pulverizer outlet passes through louver rings and rotating vane Concentrated twice, in the presence of inertia, twice after air-coal separating, the dense phase pulverized coal separated enters concentrated phase outer toroid In, light phase coal dust enters in light phase interior annular, and inside and outside ring cross-section is divided into the quantity needed for primary air piping, every etc. Adjustable valve is set respectively on the concentrated phase outer toroid section divided and on light phase interior annular section, passes through outer toroid on the partial cross-section such as every Concentrated phase regulating valve and the light phase regulating valve of interior annular are adjusted so that corresponding per decile outer toroid dense phase pulverized coal air-flow and inner circle After the light phase breeze airflow of ring is mixed, reach the purpose of the wind speed for being mixed into each primary air piping and coal powder density equilibrium.

Device provided by the invention overcomes the problem of prior art coal pulverizer outlet coal powder density skewness, structure letter Single, by the way that thick coal culm is concentrated in into outer toroid, thin powdered coal is distributed in interior annular, then deep or light phase is all divided equally, corresponding per a Bias pulverized coal is remixed into primary air piping;I.e. by outer dense interior light mode, with centrosymmetric method after coal dust is concentrated Each primary air piping is assigned to, so can be evenly distributed;And regulating valve, convenient regulation are set to every a deep or light phase.

Brief description of the drawings

Fig. 1 is traditional pulverized coal distributor schematic diagram;

Fig. 2 is the pulverized coal distributor structural representation of adjustable wind speed and coal powder density that the present embodiment provides;

Fig. 3 show the profile of the line A-A along Fig. 2;

Fig. 4 show the profile of the line B-B along Fig. 2.

Embodiment

With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate the present invention Rather than limitation the scope of the present invention.In addition, it is to be understood that after the content of the invention lectured has been read, people in the art Member can make various changes or modifications to the present invention, and these equivalent form of values equally fall within the application appended claims and limited Scope.

For the more convenient use for understanding this pulverized coal distributor, now illustrated by taking 300MW Process In A Tangential Firings as an example, this coal Powder distributor is installed on station boiler coal pulverizer outlet conduit, and coal pulverizer outlet is provided with 4 primary air pipings.

Fig. 2 is the pulverized coal distributor structural representation of adjustable wind speed and coal powder density that the present embodiment provides, described The pulverized coal distributor of adjustable wind speed and coal powder density is by louver rings 1, light phase inner tube 2, reducer pipe 3, concentrated phase regulating valve 4, dense Phase regulating valve connecting rod 5, light phase regulating valve 6, light phase regulating valve connecting rod 7, the rotation composition such as controlled motor 9 and rotating vane 10.

Primary air piping 8 becomes located at the rear end of coal pulverizer outlet coal dust cylinder 11, the front end connection of coal pulverizer outlet coal dust cylinder 11 Footpath pipe 3, the front end of reducer pipe 3 are provided with louver rings 1.Rotating vane 10 is provided with reducer pipe 3, with reference to Fig. 4, rotating vane 10 altogether may be used 12~24 are set, its rotating speed can be adjusted by rotating controlled motor 9, and adjustable range is 0~60rpm.

Light phase inner tube 2 is coaxially disposed with coal pulverizer outlet coal dust cylinder 11, and light phase inner tube 2 is located at coal pulverizer outlet coal dust circle Inside cylinder 11, the light equivalent diameter of phase inner tube 2 is 0.6~0.85 times that coal pulverizer exports coal dust cylinder 11.Light phase inner tube 2 and coal-grinding Concentrated phase outer toroid is formed between the barrel of machine outlet coal dust cylinder 11.

With reference to Fig. 3, the light section of phase inner tube 2 is divided into 4 parts, identical with each coal pulverizer primary air piping number, and per Light phase regulating valve 6 is housed, light phase regulating valve 6 connects light phase regulating valve connecting rod 7 on partial cross-section.Can by light phase regulating valve connecting rod 7 Light phase regulating valve 6 is operated, light phase regulating valve 6 can shielded area be no more than light phase inner tube 2 often divide equally sectional area 40%.

Concentrated phase outer toroid section is also divided into 4 parts, identical with each coal pulverizer primary air piping number, and per equal partial cross-section Upper that concentrated phase regulating valve 4 is housed, concentrated phase regulating valve 4 connects concentrated phase regulating valve connecting rod 5.Can be to concentrated phase by concentrated phase regulating valve connecting rod 5 Regulating valve 4 is operated, concentrated phase regulating valve 4 can shielded area be no more than concentrated phase outer toroid often divide equally sectional area 40%.

The structure of concentrated phase regulating valve 4 and light phase regulating valve 6 is folding " covering of the fan " type structure.

So, pulverized coal distributor outlet is divided into 4 parts just according to the feature of Process In A Tangential Firing, includes per portion Tube section in a quarter concentrated phase outer toroid section and the light phase of a quarter, and will be connected per a section with a primary air piping Connect.

The pulverized coal distributor of adjustable wind speed and coal powder density that the present embodiment provides, in use, comprising the following steps that:

Step 1, wind speed and coal concentration measuring device are installed on First air straight length.

Step 2, the position that all concentrated phase regulating valves 4 and light phase regulating valve 6 are first placed in standard-sized sheet;

Step 3, start rotation controlled motor 9, rotate rotating vane 10;

The coal powder density of each pipe, dense corresponding to the airduct higher to coal powder density in step 4, measurement First air straight length Phase regulating valve 4 suitably turns down;

The wind speed of each pipe, the light phase regulating valve corresponding to the airduct higher to wind speed in step 5, measurement First air straight length 6 suitably turn down;

Step 6, adjusted by the alternating of step 4 and step 5, most each primary air piping coal powder density of same coal pulverizer at last Deviation adjusting to wind speed deviation adjusting within 5% to 5% within.

Claims (8)

1. the pulverized coal distributor of a kind of adjustable wind speed and coal powder density, on coal pulverizer outlet conduit, coal pulverizer outlet is set Once airduct (8), it is characterised in that:The internal light phase inner tube (2) of coal pulverizer outlet coal dust cylinder (11) is located in including same, Concentrated phase outer toroid is formed between light phase inner tube (2) and coal pulverizer outlet coal dust cylinder (11) barrel;Light phase inner tube (2) section and dense Phase outer toroid section be all coaxially divided into the primary air piping (8) the same number of number, per equal partial cross-section respectively with one The primary air piping (8) is connected, and is respectively equipped with light phase regulating valve (6) and concentrated phase regulating valve (4) on every equal partial cross-section;
Described one end connecting reducing pipe (3) one end of coal pulverizer outlet coal dust cylinder (11) away from coal pulverizer outlet, reducer pipe (3) The other end is provided with louver rings (1);Rotating vane (10) is provided with reducer pipe (3);
The coal dust of coal pulverizer outlet is concentrated twice by the louver rings (1) and rotating vane (10), in the work of inertia Under, twice after air-coal separating, the dense phase pulverized coal separated is entered in the concentrated phase outer toroid, and light phase coal dust enters institute It is inner to state light phase inner tube (2);It is adjusted, is made by the light phase regulating valve (6) on every equal partial cross-section and concentrated phase regulating valve (4) Corresponding to often divide equally dense phase pulverized coal air-flow mixed with light phase breeze airflow, and be mixed into each primary air piping wind speed and Coal powder density is balanced.
A kind of 2. pulverized coal distributor of adjustable wind speed and coal powder density as claimed in claim 1, it is characterised in that:The rotation Rotating vane piece (10) can be set 12~24 altogether.
A kind of 3. pulverized coal distributor of adjustable wind speed and coal powder density as claimed in claim 1, it is characterised in that:The rotation The rotating speed of rotating vane piece (10) is adjusted by rotating controlled motor (9).
A kind of 4. pulverized coal distributor of adjustable wind speed and coal powder density as claimed in claim 1, it is characterised in that:It is described light Phase inner tube (2) equivalent diameter is 0.6~0.85 times that coal pulverizer exports coal dust cylinder (11).
A kind of 5. pulverized coal distributor of adjustable wind speed and coal powder density as claimed in claim 1, it is characterised in that:It is described light Phase regulating valve (6) connects light phase regulating valve connecting rod (7), and light phase regulating valve (6) can be grasped by light phase regulating valve connecting rod (7) Make.
A kind of 6. pulverized coal distributor of adjustable wind speed and coal powder density as claimed in claim 5, it is characterised in that:It is described dense Concentrated phase regulating valve (4) can be grasped by phase regulating valve (4) connection concentrated phase regulating valve connecting rod (5) by concentrated phase regulating valve connecting rod (5) Make.
A kind of 7. pulverized coal distributor of adjustable wind speed and coal powder density as claimed in claim 6, it is characterised in that:It is described light Phase regulating valve (6) can shielded area be no more than the light phase inner tube (2) often divide equally sectional area 40%, the concentrated phase regulating valve (4) can shielded area also be no more than the concentrated phase outer toroid often divide equally sectional area 40%.
A kind of 8. pulverized coal distributor of adjustable wind speed and coal powder density as claimed in claim 6, it is characterised in that:It is described dense The structure of phase regulating valve (4) and light phase regulating valve (6) is folding " covering of the fan " type structure.
CN201610004873.9A 2016-01-05 2016-01-05 A kind of pulverized coal distributor of adjustable wind speed and coal powder density CN105546569B (en)

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CN201610004873.9A CN105546569B (en) 2016-01-05 2016-01-05 A kind of pulverized coal distributor of adjustable wind speed and coal powder density

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Application Number Priority Date Filing Date Title
CN201610004873.9A CN105546569B (en) 2016-01-05 2016-01-05 A kind of pulverized coal distributor of adjustable wind speed and coal powder density

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CN105546569B true CN105546569B (en) 2017-11-21

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108758680B (en) * 2018-06-01 2019-10-15 中国神华能源股份有限公司 Coal even separator and coal pulverizer
CN109681899A (en) * 2018-12-26 2019-04-26 上海发电设备成套设计研究院有限责任公司 Coal even separator and its application method is adjusted in a kind of station boiler

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2295917Y (en) * 1997-06-05 1998-10-28 电站锅炉煤清洁燃烧国家工程研究中心 Dual adjustable coal powder distributor
CN1400420A (en) * 2002-09-09 2003-03-05 国电热工研究院 Double-stepping fuel combustion method and its double-stepping cyclone burner
CN2663827Y (en) * 2003-09-03 2004-12-15 贾朝群 A pulverized coal dispenser
JP2012192404A (en) * 2011-03-16 2012-10-11 Babcock Power Services Inc Coal flow splitter and distributor device
CN204388109U (en) * 2014-12-05 2015-06-10 苏州西热节能环保技术有限公司 A kind of wind powder distributor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2295917Y (en) * 1997-06-05 1998-10-28 电站锅炉煤清洁燃烧国家工程研究中心 Dual adjustable coal powder distributor
CN1400420A (en) * 2002-09-09 2003-03-05 国电热工研究院 Double-stepping fuel combustion method and its double-stepping cyclone burner
CN2663827Y (en) * 2003-09-03 2004-12-15 贾朝群 A pulverized coal dispenser
JP2012192404A (en) * 2011-03-16 2012-10-11 Babcock Power Services Inc Coal flow splitter and distributor device
CN204388109U (en) * 2014-12-05 2015-06-10 苏州西热节能环保技术有限公司 A kind of wind powder distributor

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