CN102721079B - Uniform air distribution device for air chamber inlet of grate-fired furnace - Google Patents
Uniform air distribution device for air chamber inlet of grate-fired furnace Download PDFInfo
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- CN102721079B CN102721079B CN201210192671.3A CN201210192671A CN102721079B CN 102721079 B CN102721079 B CN 102721079B CN 201210192671 A CN201210192671 A CN 201210192671A CN 102721079 B CN102721079 B CN 102721079B
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- air
- grate
- partition plate
- upper spacer
- air chamber
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Abstract
A uniform air distribution device for an air chamber inlet of a grate-fired furnace comprises an inverted 'J'-shaped upper partition plate mounted on the upper portion of the air chamber inlet of the grate-fired furnace. The distance between the top end of the upper partition plate and a grate ranges from 10mm to 40mm, the length of an upper straight section of the upper partition plate ranges from 10mm to 20mm, the length of a lower straight section of the upper partition plate ranges from 25mm to 40mm, the total height H1 of the upper partition plate is equal to a+ (0.3-0.4) x, a 'balancing hole' 2 is arranged on a vertical portion of the upper partition plate, and the distance S1 between the upper partition plate and an air inlet of an air chamber is equal to (0.5-0.6)X(0.25-0.3) L, wherein the a refers to the distance between the grate and the upper portion of the air inlet, the x refers to the height of the air inlet, and the L refers to the length of the air chamber. By the aid of the uniform air distribution device, fine air distribution uniformity of the air chamber is ensured, resistance is controlled within a narrow range, and conditions are created for improving the operation efficiency of the grate-fired furnace, saving energy and reducing emission.
Description
Technical field
The invention belongs to the air distribution device in power engineering technology field, be specifically related to a kind of for improving the inhomogeneity air distribution device of grate furnace cross air dispatching.
Background technology
Industrial boilers in China application is very extensive, and according to the data from State Statistics Bureau and special equipment office, by the end of the end of the year 2010, national boiler sum exceedes 600,000, and wherein grate furnace exceedes half.The Industrial Boiler design efficiency of China is generally only low by 1% ~ 3% than developed country, but service efficiency is low more than 10%.Be exactly that grate furnace air distribution is unreasonable, bad adaptability and cause the main cause that grate furnace actual operating efficiency is low, heat loss is large.The inhomogeneous problem of existing grate furnace ubiquity cross air dispatching, has increased chemistry and heat loss due to combustibles in refuse, and in the time that grate furnace off rating moves, problem is more serious.The inhomogeneous typical case of grate furnace air distribution shows that fire grate forced ventilation district is prone to burner, and at weak plenum area incomplete combustion, slag carbon content rate is high.The seventies and eighties in last century, domestic researcher has carried out test and theoretical research to grate furnace horizontal homogeneity air distribution problem.They have mainly adopted both sides air inlet and have installed the measure of current-sharing baffle plate additional, but do not address this problem completely, particularly very limited for the improvement of single admission grate furnace, also do not have a set of complete method can supply Design & reform.
For make simple in structure for the purpose of, the grate furnace, particularly small-sized grate furnace of a lot of single admissions, all do not install current-sharing dividing plate additional in air compartment.While adopting the empty air compartment without dividing plate for one-sided grate furnace air compartment, air intake air-flow, in indoor flow operating mode more complicated, exists many big and small whirlpools and backflow.General trend is: inlet air flow flings to far-end, be subject to wall to stop that rear portion is turned back and upwards flow out by fire grate, another part from both sides and top flow backwards to entrance point.Because air compartment inlet velocity is high, dynamic pressure is large, and the air-flow after stopped by fire grate can not all be gone out, and a part of gas passes fire grate, and remainder is subject to entrainmenting of air inlet jet, is involved in again main flow, forms large backflow.And for the single admission grate furnace air compartment that has installed at present homogenizing plate additional, mostly, after air compartment top installs dividing plate additional, due to its obsessive shunting action, on fire grate corresponding to dividing plate, all there is local high velocity, to keeping the stable very unfavorable of coal seam.
Summary of the invention
The object of the present invention is to provide a kind of flow distribution evenness that can improve in grate furnace air compartment, improve grate furnace operational efficiency, reach the grate furnace air compartment entrance Even air distribution device of energy-saving and emission-reduction object.
For achieving the above object, the technical solution used in the present invention is: comprise anti-" J " shape upper spacer that is arranged on grate furnace air compartment import top, the top of upper spacer is apart from fire grate 10 ~ 40mm, the upper straight section length of upper spacer is 10 ~ 20mm, lower straight section length is 25 ~ 40mm, upper spacer overall height H 1=a+ (0.3 ~ 0.4) x; The vertical component of upper spacer is offered " balance pipe "; Upper spacer is from distance S1=(0.5 ~ 0.6) × (0.25 ~ 0.3) L of air compartment air inlet; Wherein a is the distance on fire grate and air inlet top, the height that x is air inlet, and L is air compartment length.
The upper straight section of described upper spacer, lower straight section and horizontal line angle are-30 ° ~ 30 °.
The present invention adopts the anti-upper spacer of " J " shape special shape to force adherent gas to reduce, weaken the air-flow that rushes at fire grate, both filled up low regime on the anterior fire grate of air compartment, unlikelyly again form at an upper portion thereof too high velocity peak values, can also reduce the drag losses of airflow inlet simultaneously due to its guide functions.Vertical component at upper spacer is offered " balance pipe ", can effectively reduce the backflow whirlpool district of even eliminating the dividing plate back side and take into account guiding balance and the current-sharing double action of air-flow, does like this and has both reduced velocity peak values, makes again scope even up.
Brief description of the drawings
Fig. 1 is the side structure schematic diagram of plenum chamber structure of the present invention;
Detailed description of the invention
Below in conjunction with accompanying drawing, structural principle of the present invention is further described.
Referring to accompanying drawing 1, the present invention includes anti-" J " shape upper spacer 1 that is arranged on grate furnace air compartment import top, the top of upper spacer 1 is apart from fire grate 10 ~ 40mm, the upper straight section length of upper spacer is 10 ~ 20mm, lower straight section length is 25 ~ 40mm, the upper straight section of upper spacer, lower straight section and horizontal line angle are-30 ° ~ 30 °, upper spacer overall height H 1=a+ (0.3 ~ 0.4) x; The vertical component of upper spacer is offered " balance pipe " 2; Upper spacer is from distance S1=(0.5 ~ 0.6) × (0.25 ~ 0.3) L of air compartment air inlet; Wherein a is the distance on fire grate and air inlet top, the height that x is air inlet, and L is air compartment length.
Grate furnace air compartment import of the present invention top installs anti-" J " shape upper spacer additional has filled up the low regime on the anterior fire grate of air compartment, but the guide functions of upper spacer has caused again the velocity peak values at dividing plate place, anti-the particular design of " J " shape make to bring about the desired sensation adherent gas reduces, the adherent air-flow of a part has been changed the flow direction by the overhead kick on dividing plate top again, prevents that high velocity air from rushing at fire grate.Instead " J " shape upper spacer had both been filled up the low regime on the anterior fire grate of air compartment, unlikelyly again formed at an upper portion thereof too high velocity peak values, had played well the laterally effect of Even air distribution.Because anti-" J " shape upper spacer is the dividing plate of strong guide functions, air-flow is parallel to the flow at high speed of separator face at dividing plate previous crops, and reverse side is due to the existence in low speed whirlpool district, before and after causing, between side, has certain pressure reduction.Therefore, offer " balance pipe " in the vertical web part of dividing plate, can force the part high velocity air before dividing plate to change flow direction, make part air-flow flow to dividing plate rear portion by pilot hole, reduce or eliminate low speed whirlpool district, play balance and current-sharing double action.
The present invention both can be applicable to single admission grate furnace, can be applicable to again both sides air inlet grate furnace.
Claims (2)
1. grate furnace air compartment entrance Even air distribution device, it is characterized in that: comprise [the shape upper spacer (1) that is arranged on grate furnace air compartment import top, the top of upper spacer (1) is apart from fire grate 10～40mm, the upper straight section length of upper spacer (1) is 10～20mm, lower straight section length is 25～40mm, upper spacer (1) overall height H 1=a+ (0.3～0.4) x; The vertical component of upper spacer (1) is offered balance pipe (2); Upper spacer (1) vertical component is from distance S1=(0.5～0.6) × (0.25～0.3) L of air compartment air inlet; Wherein a is the distance on fire grate and air inlet top, the height that x is air inlet, and L is air compartment length.
2. grate furnace air compartment entrance Even air distribution device according to claim 1, is characterized in that: upper straight section, lower straight section and the horizontal line angle of described upper spacer (1) is-30 °～30 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210192671.3A CN102721079B (en) | 2012-06-12 | 2012-06-12 | Uniform air distribution device for air chamber inlet of grate-fired furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210192671.3A CN102721079B (en) | 2012-06-12 | 2012-06-12 | Uniform air distribution device for air chamber inlet of grate-fired furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102721079A CN102721079A (en) | 2012-10-10 |
| CN102721079B true CN102721079B (en) | 2014-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210192671.3A Expired - Fee Related CN102721079B (en) | 2012-06-12 | 2012-06-12 | Uniform air distribution device for air chamber inlet of grate-fired furnace |
Country Status (1)
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0894053A (en) * | 1994-09-29 | 1996-04-12 | Kubota Corp | Combustion air supplying mechanism for refuse incinerating furnace |
| CN1424538A (en) * | 2002-12-30 | 2003-06-18 | 上海交通大学 | Blowing system of chain boiler with sectorial blow homogenating plate |
| CN101871652A (en) * | 2010-07-09 | 2010-10-27 | 上海望特能源科技有限公司 | Adjustable dislocated transverse diffuser grid of travelling grate stoker industry boiler |
-
2012
- 2012-06-12 CN CN201210192671.3A patent/CN102721079B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0894053A (en) * | 1994-09-29 | 1996-04-12 | Kubota Corp | Combustion air supplying mechanism for refuse incinerating furnace |
| CN1424538A (en) * | 2002-12-30 | 2003-06-18 | 上海交通大学 | Blowing system of chain boiler with sectorial blow homogenating plate |
| CN101871652A (en) * | 2010-07-09 | 2010-10-27 | 上海望特能源科技有限公司 | Adjustable dislocated transverse diffuser grid of travelling grate stoker industry boiler |
Non-Patent Citations (4)
| Title |
|---|
| 常兵等.链条炉横向配分不均匀性的研究.《热能动力工程》.2007,第22卷(第3期), |
| 张元忠.链条炉风室配风均匀性的试验研究.《能源工程》.1985,(第3期), |
| 链条炉横向配分不均匀性的研究;常兵等;《热能动力工程》;20070531;第22卷(第3期);288-291 * |
| 链条炉风室配风均匀性的试验研究;张元忠;《能源工程》;19850630(第3期);6-12 * |
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| CN102721079A (en) | 2012-10-10 |
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