CN100422640C - Circulating fluid bed ash pneumatic control distributing valve - Google Patents
Circulating fluid bed ash pneumatic control distributing valve Download PDFInfo
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- CN100422640C CN100422640C CNB2005101029046A CN200510102904A CN100422640C CN 100422640 C CN100422640 C CN 100422640C CN B2005101029046 A CNB2005101029046 A CN B2005101029046A CN 200510102904 A CN200510102904 A CN 200510102904A CN 100422640 C CN100422640 C CN 100422640C
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Abstract
The present invention relates to a circulating fluid-bed circulating ash pneumatic control distribution valve. It includes the following several portions: high-temperature gas-solid separator, vertical breaker plate, first and second feeding chambers, first and second discharging chambers, first and second overflow holes, air distribution plate and air chamber. Said invention also provides the connection mode of all the above-mentioned portions and the working principle of said circulating ash pneumatic control valve.
Description
Technical field
The present invention relates to circulating ash flow-dividing control device, particularly a kind of distributing valve of pneumatic control in a kind of burning device of circulating fluidized bed.
Background technology
Adopt the CFBB of external heat exchanger and circulating fluidized bed incinerator, be the multi-joint of core in the system with the recirculating fluidized bed, all need the high-temp circulating ash that separator separates is distributed and controls, a circulating ash part is directly returned burner hearth, and another part is sent in external heat exchanger or the gasification furnace.Present circulating ash distributing valve can be divided into two kinds of mechanical type and on-mechanical formulas.
Mechanical valve mainly contains the cone valve that is widely used on the Lurgi type CFBB, and the slide type gate valve of MSFB type.The advantage of mechanical valve is that control characteristic is good, the operation control and regulation are flexible; But owing at high temperature work for a long time, the mechanical valve complex structure, easily jam, easily wearing and tearing, material rate height, cost an arm and a leg.
Non-mechanical means mainly is the pneumatic control mode, not by frame for movement, but regulates the high-temp circulating ash that control enters external heat exchanger by the fluidisation wind action.Chinese patent 200410037095 discloses a kind of wind control type material external circulating device of recirculating fluidized bed, is to regulate the high-temp circulating ash amount that enters material returning device and external heat exchanger by controlling each cloth wind air quantity of sending into when material returning device and external heat exchanger move.Chinese patent 00238546 discloses a kind of compact splitting-type returning ash heat exchanger, and the ash distributing chamber that carries out the ash distribution by the adjusting fluidized wind sends into ash respectively the high temperature ash returning tube and sends into heat exchange bed through split-flow baffles.
Summary of the invention
The objective of the invention is to propose a kind of circulating fluid bed ash pneumatic control distributing valve, adopt pneumatic mode that high-temp circulating ash is divided into two parts, and regulate this two-part circulating ash flow rate.
Technical scheme of the present invention is as follows:
Circulating fluid bed ash pneumatic control distributing valve provided by the invention comprises:
Be arranged on the vertical flow distribution plate 2 under the burning device of circulating fluidized bed High Temperature Gas solid separator dipleg 1, described vertical flow distribution plate 2 both sides are provided with top respectively and communicate, the bottom surface is in first feed space 3 and second feed space 5 of same level height, and described flow distribution plate 2 is divided into two parts with the projection of separator dipleg 1 on bottom surface, two Room; Also comprise first discharge chamber 4 and second discharge chamber 6; The top of described first discharge chamber 4 and second discharge chamber 6 is respectively equipped with first overfall 7 and second overfall 8 that the bottom is in same level height;
Described first feed space 3 communicates by first lateral aperture 9 with first discharge chamber, 4 bottoms, and second feed space 5 communicates by second lateral aperture 10 with second discharge chamber, 6 bottoms; Described first lateral aperture 9 and second lateral aperture, 10 tops are in same level height; Flow distribution plate 2 tops are not less than first lateral aperture, 9 tops, and are not higher than first overfall, 7 bottoms; Described first discharge chamber 4, first feed space 3, second feed space 5 and second discharge chamber, 6 bottom surfaces are equipped with the air distribution plate of band blast cap, the air distribution plate below is provided with and described first discharge chamber 4, first feed space 3, second feed space 5 and second discharge chamber, 6 corresponding air compartments respectively, feeds the adjustable fluidized wind of flow in the air compartment.
The ratio of the area of two parts that described flow distribution plate 2 is divided into the projection of separator dipleg 1 on first feed space 3 and second feed space, 5 bottom surfaces is 0.1-10.0.
Principle of the present invention is, by structure and pneumatic operating condition, the circulating ash separated into two parts that burning device of circulating fluidized bed High Temperature Gas solid separator is separated, the ratio of two parts circulating ash realizes the control to the circulating ash quantity that enters external heat exchanger by regulating first feed space, second feed space and first discharge chamber, the physical dimension of second discharge chamber and the fluidizing velocity of fluidized wind.Improve the fluidising air velocity of first feed space or first discharge chamber, the circulating ash quantity that enters first feed space increases thereupon, otherwise then reduces.Like this,, high-temp circulating ash is distributed between first feed space and second feed space, can between the 0-100% that accounts for global cycle ash amount, regulate two parts circulating ash quantity by changing fluidising air velocity.
Particularly, by flow distribution plate is set, the feed space that directly returns the circulating ash of burner hearth is separated with the feed space that enters the circulating ash of external heat exchanger heat exchange; The flow distribution plate top is not less than the first lateral aperture top, makes the not mutual interference mutually of fluidized wind of first feed space and second feed space, thereby the fluidized wind that guarantees first feed space and second feed space is independent and reliably to the distribution of two parts circulating ash quantity and adjusting; In addition, when needs were closed a side circulating ash loop, the flow distribution plate top was not less than the first lateral aperture top and has guaranteed this reliability of closing.
The flow distribution plate top is not higher than the first overfall bottom, can guarantee that then flow distribution plate all is immersed in the circulating ash, circulating ash can be according to the change of the fluidising air velocity of first feed space, second feed space and first discharge chamber, second discharge chamber like this, the instant ash amount that flows into first feed space and second feed space that changes.
If flow distribution plate is higher than the first overfall bottom, when the fluidising air velocity of first feed space, first discharge chamber and second feed space, second discharge chamber near the time, circulating ash material level face is a little more than first overfall, flow distribution plate will be higher than circulating ash material level face, the circulating ash quantity that enters first feed space and second feed space is decided by directly to fall into wherein ash amount from dipleg substantially, and pneumatic control was lost efficacy substantially.Simultaneously, because circulating ash distribution on its cross section in the dipleg dropping process has certain randomness and inhomogeneities, make the circulating ash quantity that falls into first feed space and second feed space also have randomness and inhomogeneities, the circulating ash quantity that enters external heat exchanger is not only uncontrollable, and constantly fluctuation; Have only the fluidising air velocity gap of working as first feed space, first discharge chamber and second feed space, second discharge chamber bigger, the circulating ash of the less side of fluidising air velocity is piled up, and surpasses the flow distribution plate top, and pneumatic control this moment ability could be recovered to some extent.
Flow distribution plate is divided into two parts with the projection of separator dipleg on first feed space and the second feed space bottom surface, the ratio of this two-part area is 0.1-10.0, be to consider if return the returning charge open height of circulating ash of burner hearth respectively when inequality through first overfall and second overfall, the pressure of first overfall and second overfall is also with different, the returning charge open height is high more, corresponding overfall pressure is then low more, circulating ash is also just low more from the separator dipleg resistance that this overfall returns burner hearth of flowing through, and the circulating ash flow rate in this loop is also big more.Yet, for circulating ash for the distribution in the two circulating ash loops, general when wishing that fluidising air velocity when first feed space, first discharge chamber and second feed space, second discharge chamber is identical, circulating ash flow rate in two loops is also identical, and two parts circulating ash can both be regulated in the big like this scope of the 0-100% that accounts for global cycle ash amount.Therefore according to the pressure of first overfall and second overfall, choose the concrete numerical value of two parts area ratio: when the first overfall pressure is big, the projected area of separator dipleg on the first feed space bottom surface is bigger, the separator dipleg in the projection on the first feed space bottom surface and projected area ratio on the second feed space bottom surface greater than 1; Otherwise then the projected area of separator dipleg on the second feed space bottom surface is bigger, and two parts area ratio is less than 1.
Advantage of the present invention is that a kind of circulating fluid bed ash pneumatic control distributing valve that is proposed is by simple structure and easy operation, realization is to distribution, adjusting and the control of high-temp circulating ash, not easy to wear, there is not moving component yet, mechanical breakdown can not take place.This circulating fluid bed ash pneumatic control distributing valve can be used for CFBB, circulating fluidized bed incinerator, be that core multi-joint such as supplies at burning device of circulating fluidized bed with the recirculating fluidized bed.
Description of drawings
Fig. 1 is the structural representation of embodiments of the invention 1;
Fig. 2 is the structural representation of embodiments of the invention 2;
Fig. 3 is the vertical view of embodiments of the invention 3;
Fig. 4 is the D-D profile of embodiments of the invention 3.
The specific embodiment:
Fig. 1 is the structural representation of embodiment 1; As seen from the figure, the structure of the circulating fluid bed ash pneumatic control distributing valve of present embodiment is as follows:
One vertical flow distribution plate 2 is set under burning device of circulating fluidized bed High Temperature Gas solid separator dipleg 1, its both sides are provided with first feed space 3 and second feed space 5 respectively, top, two Room communicates, the bottom surface is in same level height, and vertically flow distribution plate 2 is divided into two parts with the projection of separator dipleg 1 on bottom surface, two Room; Also comprise first discharge chamber 4 and second discharge chamber 6; First feed space 3 communicates by first lateral aperture 9 with first discharge chamber, 4 bottoms, and first discharge chamber, 4 tops are provided with first overfall 7; Second feed space 5 communicates by second lateral aperture 10 with second discharge chamber, 6 bottoms, and second discharge chamber, 6 tops are provided with second overfall 8; First overfall 7, second overfall, 8 bottoms are in same level height; First lateral aperture 9 and second lateral aperture, 10 tops are in same level height; Vertically flow distribution plate 2 tops and first lateral aperture, 9 tops are contour; Described first discharge chamber 4, first feed space 3, second feed space 5 and second discharge chamber, 6 bottom surfaces are equipped with the air distribution plate of band blast cap, the air distribution plate below is provided with respectively and described first discharge chamber 4, first feed space 3, second feed space 5 and second discharge chamber, 6 corresponding air compartments, feeds the adjustable fluidized wind of flow in the air compartment.Vertically flow distribution plate 2 is with the projection five equilibrium of separator dipleg 1 on first feed space 3 and second feed space, 5 bottom surfaces.
Fig. 2 is the structural representation of embodiment 2; As seen from the figure, the structure of the circulating fluid bed ash pneumatic control distributing valve of present embodiment is as follows:
One vertical flow distribution plate 2 is set under burning device of circulating fluidized bed High Temperature Gas solid separator dipleg 1, its both sides are provided with first feed space 3 and second feed space 5 respectively, top, two Room communicates, the bottom surface is in same level height, and vertically flow distribution plate 2 is divided into two parts with the projection of separator dipleg 1 on bottom surface, two Room; Also comprise first discharge chamber 4 and second discharge chamber 6; First feed space 3 communicates by first lateral aperture 9 with first discharge chamber, 4 bottoms, and first discharge chamber, 4 tops are provided with first overfall 7; Second feed space 5 communicates by second lateral aperture 10 with second discharge chamber, 6 bottoms, and second discharge chamber, 6 tops are provided with second overfall 8; First overfall 7, second overfall, 8 bottoms are in same level height; First lateral aperture 9 and second lateral aperture, 10 tops are in same level height; Vertically flow distribution plate 2 tops and first overfall, 7 bottoms are in same level height; Described first discharge chamber 4, first feed space 3, second feed space 5 and second discharge chamber, 6 bottom surfaces are equipped with the air distribution plate of band blast cap, the air distribution plate below is provided with respectively and described first discharge chamber 4, first feed space 3, second feed space 5 and second discharge chamber, 6 corresponding air compartments, feeds the adjustable fluidized wind of flow in the air compartment.Vertically the ratio of the area of flow distribution plate 2 two parts that the projection of separator dipleg 1 on first feed space 3 and second feed space, 5 bottom surfaces is divided into is 0.1 (perhaps being 10).
Fig. 3 and Fig. 4 are the structural representation of embodiment 3; As seen from the figure, the structure of the circulating fluid bed ash pneumatic control distributing valve of present embodiment is as follows:
Pneumatic control distributing valve is made up of 4 sections pipeline sections, first section pipeline section and burning device of circulating fluidized bed High Temperature Gas solid separator dipleg 1 concentric equal diameter, be positioned under the separator dipleg 1, second section pipeline section and first section pipeline section bottom surface are on same horizontal plane, part is positioned at first section pipeline section inside, form vertical arc flow distribution plate 2, first section pipeline section inside is divided into first feed space 3 and top, second feed space Room 5, two communicates; Second feed space 5 is the part of second section pipeline section in first section pipeline section, it then is second discharge chamber 6 that second section pipeline section is positioned at the outer part of first section pipeline section, first section pipeline section is on the sidewall between second feed space 5 and second discharge chamber 6 and has second lateral aperture 10, and its bottom is equal with bottom surface, two Room; Second feed space 5 communicates by second lateral aperture 10 with second discharge chamber, 6 bottoms, and second discharge chamber, 6 tops are provided with second overfall 8;
The 3rd section pipeline section is first discharge chamber 4, and itself and first feed space, 3 bottoms are by the 4th section pipeline section, and promptly first lateral aperture 9 is connected; First discharge chamber, 4 tops are provided with first overfall 7; First overfall 7, second overfall, 8 bottoms are in same level height; First lateral aperture 9 and second lateral aperture, 10 tops are in same level height; Flow distribution plate 2 tops are not less than first lateral aperture, 9 tops, and are not higher than first overfall, 11 bottoms; First discharge chamber 4, described first discharge chamber 4, first feed space 3, second feed space 5 and second discharge chamber, 6 bottom surfaces are equipped with the air distribution plate of band blast cap, the air distribution plate below is provided with respectively and described first discharge chamber 4, first feed space 3, second feed space 5 and second discharge chamber, 6 corresponding air compartments, feeds the adjustable fluidized wind of flow in the air compartment.The ratio of the area of two parts that flow distribution plate 2 is divided into the projection of separator dipleg 1 on first feed space 3 and second feed space, 5 bottom surfaces is 4.
Claims (2)
1. a circulating fluid bed ash pneumatic control distributing valve is characterized in that, comprising:
Be arranged on the vertical flow distribution plate (2) under the burning device of circulating fluidized bed High Temperature Gas solid separator dipleg (1), described vertical flow distribution plate (2) both sides are provided with first feed space (3) and second feed space (5) that top communicates, the bottom surface is in same level height respectively, and described flow distribution plate (2) is divided into two parts with the projection of separator dipleg (1) on bottom surface, two Room; Also comprise first discharge chamber (4) and second discharge chamber (6); The top of described first discharge chamber (4) and second discharge chamber (6) is respectively equipped with first overfall (7) and second overfall (8) that the bottom is in same level height;
Described first feed space (3) communicates by first lateral aperture (9) with first discharge chamber (4) bottom, and second feed space (5) communicates by second lateral aperture (10) with second discharge chamber (6) bottom; Described first lateral aperture (9) and second lateral aperture (10) top are in same level height; Flow distribution plate (2) top is not less than first lateral aperture (9) top, and is not higher than first overfall (7) bottom; Described first discharge chamber (4), first feed space (3), second feed space (5) and second discharge chamber (6) bottom surface are equipped with the air distribution plate of band blast cap, the air distribution plate below is provided with respectively and described first discharge chamber (4), first feed space (3), second feed space (5) and the corresponding air compartment of second discharge chamber (6), feeds the adjustable fluidized wind of flow in the air compartment.
2. by claim item 1 described circulating fluid bed ash pneumatic control distributing valve, it is characterized in that the ratio of the area of two parts that described flow distribution plate (2) is divided into the projection of separator dipleg (1) on first feed space (3) and second feed space (5) bottom surface is 0.1-10.0.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101029046A CN100422640C (en) | 2005-09-13 | 2005-09-13 | Circulating fluid bed ash pneumatic control distributing valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101029046A CN100422640C (en) | 2005-09-13 | 2005-09-13 | Circulating fluid bed ash pneumatic control distributing valve |
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| CN1932378A CN1932378A (en) | 2007-03-21 |
| CN100422640C true CN100422640C (en) | 2008-10-01 |
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| CNB2005101029046A Active CN100422640C (en) | 2005-09-13 | 2005-09-13 | Circulating fluid bed ash pneumatic control distributing valve |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103423737B (en) * | 2012-05-25 | 2016-09-14 | 中国科学院工程热物理研究所 | Circulating fluidized bed system with pneumatic control distributing valve and the circuit system of recirculating fluidized bed |
| CN102865574B (en) * | 2012-10-11 | 2015-01-07 | 中国华能集团清洁能源技术研究院有限公司 | Material returning system capable of improving distribution uniformity of materials inside large circulating fluidized bed boiler |
| CN102901093A (en) * | 2012-10-15 | 2013-01-30 | 清华大学 | Double-way controllable material returning valve for circulating fluidized bed boiler |
| CN104930502B (en) * | 2015-05-14 | 2017-10-24 | 中国矿业大学 | A kind of multi-channel distribution device for being applicable the material balance control of many bed body systems |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5580241A (en) * | 1993-05-04 | 1996-12-03 | Biothermica International Inc. | Multistage circulating fluidized bed |
| CN2427739Y (en) * | 2000-06-28 | 2001-04-25 | 国家电力公司热工研究院 | Compact type bypass flow and dust returning-back heat exchanger |
| CN2610226Y (en) * | 2003-01-13 | 2004-04-07 | 中国科学院工程热物理研究所 | Ash cooling device for regulating temp. of frepot of recirculating fluidized bed |
| CN1181286C (en) * | 2001-12-22 | 2004-12-22 | 浙江大学 | Pneumatic control type material external circulating equipment for circulating fluidized bed boiler |
-
2005
- 2005-09-13 CN CNB2005101029046A patent/CN100422640C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5580241A (en) * | 1993-05-04 | 1996-12-03 | Biothermica International Inc. | Multistage circulating fluidized bed |
| CN2427739Y (en) * | 2000-06-28 | 2001-04-25 | 国家电力公司热工研究院 | Compact type bypass flow and dust returning-back heat exchanger |
| CN1181286C (en) * | 2001-12-22 | 2004-12-22 | 浙江大学 | Pneumatic control type material external circulating equipment for circulating fluidized bed boiler |
| CN2610226Y (en) * | 2003-01-13 | 2004-04-07 | 中国科学院工程热物理研究所 | Ash cooling device for regulating temp. of frepot of recirculating fluidized bed |
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| CN1932378A (en) | 2007-03-21 |
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