CN100427825C - Pneumatic controlling ash-in external heat exchanger - Google Patents
Pneumatic controlling ash-in external heat exchanger Download PDFInfo
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- CN100427825C CN100427825C CNB2005101029050A CN200510102905A CN100427825C CN 100427825 C CN100427825 C CN 100427825C CN B2005101029050 A CNB2005101029050 A CN B2005101029050A CN 200510102905 A CN200510102905 A CN 200510102905A CN 100427825 C CN100427825 C CN 100427825C
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Abstract
The present invention relates to an externally-placed heat exchanger for pneumatically-controlling ash admission for circulating fluid-bed combustion equipment. It includes a circulating ash pneumatic control distribution valve and an externally-placed heat exchanger. Said invention utilizes the invented structure and pneumatic operation condition to make a portion of circulating ash separated from high-temperature gas-solid separator be directly returned into the furnace cavity and make another portion of said circulating ash be fed into the externally-placed heat exchanger, after having been heat-exchanged by heat-exchange surface said partial circulating ash can be returned into the furnace cavity. The ratio of flow rates of the above-mentioned two portions of circulating ash can be regulated by means of fluidized air so as to implement control of circulating ash quantity to be fed into the externally-placed heat exchanger.
Description
Technical field
The present invention relates to the external heat exchanger in a kind of burning device of circulating fluidized bed, particularly a kind of external heat exchanger of Pneumatic controlling ash-in.
Background technology
External heat exchanger is a fine particle bubbling fluidized bed of being placed heating surface by the inside that one or more bins constitute, be arranged in the high-temp circulating ash loop of burning device of circulating fluidized bed, heating surface is wherein generally arranged in the coiled pipe mode, and be immersed in and be in the fluidised hot ash, the cooling medium (steam or water) in the pipe absorbs hot grey heat.High-temp circulating ash under the High Temperature Gas solid separator of burning device of circulating fluidized bed separates is under the adjusting and control of part flow arrangement, a part is directly returned burner hearth through material returning device, another part enters external heat exchanger, and is arranged in after wherein heating surface carries out heat exchange, returns burner hearth.
The application of external heat exchanger in CFBB helps the layout of boiler heating surface; The boiler load adjusting function is good, helps reducing the discharging of pollutant; The steam temperature regulatory function is good; Fuel tolerance is good; Good corrosion resistance.These advantages of external heat exchanger, major part all are based upon on the basis to the well-tuned of the high-temp circulating ash flow rate that enters external heat exchanger and control, so the circulating ash part flow arrangement just seems particularly important.Present circulating ash part flow arrangement 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.
Summary of the invention
The objective of the invention is to propose a kind of external heat exchanger of Pneumatic controlling ash-in, the high-temp circulating ash amount that adopts pneumatic mode control to enter external heat exchanger, high-temp circulating ash carries out returning burner hearth after the heat exchange with the heat-transfer surface that is arranged in wherein in external heat exchanger, thereby reach the purpose of control heat exchange amount, and play the effect of regulating bed temperature or steam temperature etc.
Technical scheme of the present invention is as follows:
The external heat exchanger of Pneumatic controlling ash-in provided by the invention comprises: a circulating ash pneumatic control distributing valve 100 and an external heat exchanger 200;
Described circulating ash pneumatic control distributing valve 100 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, two Room respectively and communicate, the bottom surface is in first feed space 3 and second feed space 5 of same level height, and described vertical 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 10 with first discharge chamber, 4 bottoms, and second feed space 5 communicates by second lateral aperture 11 with second discharge chamber, 6 bottoms; Described first lateral aperture 10 and second lateral aperture, 11 tops are in same level height; Vertically flow distribution plate 2 tops are not less than first lateral aperture, 10 tops, and are not higher than first overfall, 7 bottoms; Described first discharge chamber 4, first feed space 3, second feed space 5, second discharge chamber, 6 bottom surfaces are 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;
Described external heat exchanger 200 comprises: be arranged on the vertical deflection plate 12 in the heat exchanger, leave air balance hole 13 between described deflection plate 12 upper ends and the heat exchanger end face, and the external heat exchanger inner chamber is divided into external heat exchanger first Room 20 and external heat exchanger second Room 21,20 tops, described external heat exchanger first Room communicate with second overfall 8, the bottom communicates with external heat exchanger second Room 21, and 21 tops, described external heat exchanger second Room communicate with burner hearth by the 3rd overfall 9; Described external heat exchanger first Room 20 and 21 bottom surfaces, external heat exchanger second Room are the air distribution plate of band blast cap, air distribution plate below respectively with described external heat exchanger first Room 20 and external heat exchanger second Room 21 corresponding air compartments, feed the adjustable fluidized wind of flow in the air compartment.
The ratio of the area of two parts that described vertical 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 0.25-4.0.Described external heat exchanger first Room 20 is 0.05-20.00 with the ratio of external heat exchanger second Room 21 cross-sectional areas.
Principle of the present invention is, by structure and pneumatic operating condition, the circulating ash part that burning device of circulating fluidized bed High Temperature Gas solid separator is separated is directly returned burner hearth, and another part enters external heat exchanger, returned burner hearth again after the heating surface cooling; The ratio of two parts circulating ash realizes the control to the circulating ash quantity that enters external heat exchanger by regulating the fluidising air velocity of first feed space, second feed space and first discharge chamber, second discharge chamber.Improve the fluidising air velocity of second feed space or second discharge chamber, the circulating ash quantity that enters external heat exchanger 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 the circulating ash quantity that enters external heat exchanger 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.
Vertically 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 vertically 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, vertically 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.
Vertically 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 0.25-4.0, be to consider the returning charge open height that directly returns burner hearth when circulating ash, return the returning charge open height of burner hearth through external heat exchanger with circulating ash, when if the two is inequality, the pressure of first overfall and the 3rd 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, so just can make the circulating ash of directly returning burner hearth and can both regulate in the big like this scope of the 0-100% that accounts for global cycle ash amount through the circulating ash that external heat exchanger returns burner hearth.Therefore according to the pressure of first overfall and the 3rd 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 be that projected area on the second feed space bottom surface is bigger; Two parts area ratio is less than 1.
In the external heat exchanger if deflection plate is not set, the circulating ash that enters in the external heat exchanger can be under the fluidisation of external heat exchanger fluidized wind, enter from second overfall on external heat exchanger top, directly leave again, weaken the heat exchange effect between circulating ash and the heat-transfer surface from superposed the 3rd overfall.The setting of deflection plate has guaranteed that circulating ash all flows through the external heat exchanger heat-transfer surface, and fully heat exchange with it.External heat exchanger first Room that deflection plate is separated out and the big I of external heat exchanger second Room are determined as required, when close second overfall of deflection plate or the 3rd overfall, only in external heat exchanger second Room or the external heat exchanger first indoor layout heat-transfer surface, another chamber is only as charging or tapping channel; Deflection plate is positioned at external heat exchanger when middle part, is particularly useful for the external heat exchanger of double-current journey, arranges the superheater and the reheater of boiler, perhaps economizer and superheater respectively as the deflection plate both sides.The fluidized wind of second feed space and second discharge chamber returns burner hearth through the air balance hole and the 3rd overfall on deflection plate top.
Advantage of the present invention is that the external heat exchanger of a kind of Pneumatic controlling ash-in amount that is proposed by the structure of simplification and easy operation, is realized distribution, adjusting and control to high-temp circulating ash, and is not easy to wear, also do not have moving component, mechanical breakdown can not take place.The external heat exchanger of this Pneumatic controlling ash-in 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;
The specific embodiment:
Embodiment 1
Fig. 1 is the structural representation of embodiments of the invention 1, and as seen from the figure, the concrete structure of the external heat exchanger of the Pneumatic controlling ash-in 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; 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;
External heat exchanger is divided into external heat exchanger first Room 20 and external heat exchanger second Room 21 by deflection plate 12,20 tops, external heat exchanger first Room communicate with second overfall 8, the bottom communicates with external heat exchanger second Room 21, and 21 tops, external heat exchanger second Room communicate with burner hearth by the 3rd overfall 9; First overfall 7, second overfall 8 and the 3rd overfall 9 bottoms are in same level height; First lateral aperture 10 and second lateral aperture, 11 tops are in same level height;
Vertically flow distribution plate 2 tops are not less than first lateral aperture, 10 tops, and are not higher than first overfall, 7 bottoms;
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; External heat exchanger first Room 20 is 0.05 with the ratio of external heat exchanger second Room 21 cross-sectional areas, in external heat exchanger second Room 21, arrange heating surface (perhaps external heat exchanger first Room 20 is 20 with the ratio of external heat exchanger second Room 21 cross-sectional areas, arranges heating surface in external heat exchanger first Room 20).
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 respectively first feed space 3 and second feed space 5, 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; 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;
External heat exchanger is divided into external heat exchanger first Room 20 and external heat exchanger second Room 21 by deflection plate 12,20 tops, external heat exchanger first Room communicate with second overfall 8, the bottom communicates with external heat exchanger second Room 21, and 21 tops, external heat exchanger second Room communicate with burner hearth by the 3rd overfall 9; First overfall 7, second overfall 8 and the 3rd overfall 9 bottoms are in same level height; First lateral aperture 10 and second lateral aperture, 11 tops are in same level height;
Vertically flow distribution plate 2 tops and first overfall, 7 bottoms are in same level height;
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 0.25 (perhaps being 4); External heat exchanger first Room 20 is 1 with the ratio of external heat exchanger second Room 21 cross-sectional areas, all arranges heating surface in external heat exchanger first Room 20 and external heat exchanger second Room 21.
Claims (3)
1, a kind of external heat exchanger of Pneumatic controlling ash-in comprises: a circulating ash pneumatic control distributing valve (100) and an external heat exchanger (200);
Described circulating ash pneumatic control distributing valve (100) 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 top, two Room 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 (10) with first discharge chamber (4) bottom, and second feed space (5) communicates by second lateral aperture (11) with second discharge chamber (6) bottom; Described first lateral aperture (10) and second lateral aperture (11) top are in same level height; Flow distribution plate (2) top is not less than first lateral aperture (10) top, and is not higher than first overfall (7) bottom; Described first discharge chamber (4), first feed space (3), second feed space (5), second discharge chamber (6) bottom surface are 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;
Described external heat exchanger (200) comprising: be arranged on the vertical deflection plate (12) in the external heat exchanger, leave air balance hole (13) between described deflection plate (12) upper end and the external heat exchanger end face, and the external heat exchanger inner chamber is divided into external heat exchanger first Room (20) and external heat exchanger second Room (21), top, described external heat exchanger first Room (20) communicates with second overfall (8), the bottom communicates with external heat exchanger second Room (21), and top, described external heat exchanger second Room (21) communicates with burner hearth by the 3rd overfall (9); Described external heat exchanger first Room (20) and bottom surface, external heat exchanger second Room (21) are the air distribution plate of band blast cap, air distribution plate below respectively with the corresponding air compartment in described external heat exchanger first Room (20) and external heat exchanger second Room (21), the adjustable fluidized wind of feeding flow in the air compartment.
2, press the external heat exchanger of claim item 1 described Pneumatic controlling ash-in, 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 0.25-4.0.
By the external heat exchanger of claim item 1 described Pneumatic controlling ash-in, it is characterized in that 3, described external heat exchanger first Room (20) is 0.05-20.00 with the ratio of external heat exchanger second Room (21) cross-sectional area.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101029050A CN100427825C (en) | 2005-09-13 | 2005-09-13 | Pneumatic controlling ash-in external heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101029050A CN100427825C (en) | 2005-09-13 | 2005-09-13 | Pneumatic controlling ash-in external heat exchanger |
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| CN1932379A CN1932379A (en) | 2007-03-21 |
| CN100427825C true CN100427825C (en) | 2008-10-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102072484A (en) * | 2010-11-25 | 2011-05-25 | 中国科学院山西煤炭化学研究所 | Discharged material return circulation control device for fluidized coal gasifier and application thereof |
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| CN102840578B (en) * | 2011-06-23 | 2015-06-24 | 中国科学院工程热物理研究所 | Compact parallel connection type external fluidized bed heat exchanger |
| CN102353043B (en) * | 2011-08-23 | 2013-07-03 | 无锡太湖锅炉有限公司 | Adjustable external heat exchanger for circulating fluidized bed boiler |
| 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 |
| CN108758619A (en) * | 2018-05-08 | 2018-11-06 | 国家能源投资集团有限责任公司 | The external heat exchanger of circulating fluidized bed boiler |
| CN111536496B (en) * | 2020-04-21 | 2022-06-24 | 东南大学 | Pressurized oxygen-enriched combustion circulating fluidized bed boiler and method thereof |
| CN112443834B (en) * | 2020-11-09 | 2022-09-20 | 东南大学 | Material circulation air control system of circulating fluidized bed boiler |
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| US4548138A (en) * | 1981-12-17 | 1985-10-22 | York-Shipley, Inc. | Fast fluidized bed reactor and method of operating the reactor |
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| CN102072484A (en) * | 2010-11-25 | 2011-05-25 | 中国科学院山西煤炭化学研究所 | Discharged material return circulation control device for fluidized coal gasifier and application thereof |
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| CN1932379A (en) | 2007-03-21 |
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Effective date of registration: 20201201 Address after: No.56, Huanghai Avenue, Lianyungang Economic and Technological Development Zone, Lianyungang City, Jiangsu Province 222000 Patentee after: JIANGSU CHINESE ACADEMY OF SCIENCES ENERGY POWER RESEARCH CENTER Patentee after: Institute of Engineering Thermophysics, Chinese Academy of Sciences Address before: 100080 No. 12, Zhongguancun Road, Beijing, Haidian District Patentee before: Institute of Engineering Thermophysics, Chinese Academy of Sciences |