CN2427739Y - Compact type bypass flow and dust returning-back heat exchanger - Google Patents
Compact type bypass flow and dust returning-back heat exchanger Download PDFInfo
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- CN2427739Y CN2427739Y CN 00238546 CN00238546U CN2427739Y CN 2427739 Y CN2427739 Y CN 2427739Y CN 00238546 CN00238546 CN 00238546 CN 00238546 U CN00238546 U CN 00238546U CN 2427739 Y CN2427739 Y CN 2427739Y
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- ash
- chamber
- high temperature
- returning
- heat exchange
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Abstract
The utility model relates to a compact type bypass flow and dust returning-back heat exchanger which is used for a circulating fluidized bed boiler. A dust inlet pipe is communicated with a high temperature dust material chamber which is communicated with a dust distributing chamber by a dust returning-back baffle, the dust is sent to a high temperature dust returning-back pipe and a heat exchange bed through a bypass flow baffle by the dust distributing chamber which distributes the dust by regulating the fluidized wind, and the heat exchange bed and a low temperature material returning-back chamber are arranged in turn. The lower parts of the high temperature dust material chamber, the dust distributing chamber, the heat exchange bed and the low temperature material returning-back chamber are all provided with a wind distribution board, a fluidized wind chamber and a wind chamber baffle, the inner of the heat exchange bed is provided with a heat exchanger, and the low temperature material returning-back chamber is provided with a low temperature dust returning-back pipe. The running of a low speed fluidization way is adopted by the bypass flow and dust returning-back heat exchanger, and the utility model has the advantages of compact structure, small abrasion of the pipe bundle of the heating surface, and flexible dust flow regulation.
Description
The utility model belongs to recirculating fluidized bed (CFB) field of boilers equipment, is specifically related to a kind of compact splitting-type returning ash heat exchanger.
Increase along with the CFBB capacity, particularly capacity is greater than the CFBB of pattern of fever again more than the 100MW, and surrounded surface amasss relative deficiency in the combustion chamber, stove internal heating surface arrangement space is not enough or can arrange problems such as liability fraying is serious though exist.One of solution to the problems described above is to arrange outer heat exchanger on the grey closed circuit between the cyclone separator of CFBB and the burner hearth, one group of a part of heat transferred or array heating surface that circulating ash is loaded with.External heat exchanger and matching used circulating ash loopback and part flow arrangement complex structure that domestic and international existing CFBB adopts, difficult arrangement.External heat exchanger and the feed back controller and the cone valve of the Lurgi type CFBB of strange (Lurgi) company in for example German Shandong research and development.Its operation principle is that the high temperature ash part that high temperature cyclone separator separates directly enters the combustion chamber by the feed back controller, a part is sent in the external heat exchanger by cone valve, through with external heat exchanger in the heating surface arranged carry out entering the combustion chamber again after the heat exchange.Be used to shunt the cone valve valve rod and the valve body employing water cooling of circulating ash, complex structure, maintenance workload is big.Above-mentioned arrangement also exists and takies highly greatlyyer, often makes the standpipe height of cyclone separator bottom shorter, is difficult to form enough material envelopes, influences the separative efficiency of cyclone separator and the operating characteristic in circulating ash loop.
The purpose of this utility model provides a kind of compact conformation, is convenient to layout, and has the compact splitting-type returning ash heat exchanger of shunting, cooling and the loop back function of circulating ash simultaneously concurrently, structurally realizes integration.
This compact splitting-type returning ash heat exchanger, comprise ash inlet tube 1, high temperature ash returning tube 4, heat exchange bed 5,6, heat exchanger 7,21, low temperature ash returning tube 16, it is characterized in that ash inlet tube 1 is communicated with high temperature ash material chamber 2, high temperature ash material chamber 2 is communicated with by returning grey dividing plate 14 with ash distributing chamber 3, the ash distributing chamber 3 that carries out the ash distribution by the adjusting fluidized wind sends into ash high temperature ash returning tube 4 and sends into heat exchange bed 5 through split-flow baffles 15, in 6, heat exchange bed 5,6 and low temperature feed back chamber 13 arrange successively, described high temperature ash material chamber 2, ash distributing chamber 3, heat exchange bed 5,6 and low temperature feed back chamber 13 mutually the next-door neighbour be combined into one, their bottom all is furnished with air distribution plate 18, fluidisation air compartment 11 and air compartment baffle 12, be furnished with heat exchanger 7 in the heat exchange bed, 21, low temperature feed back chamber 13 is provided with low temperature ash returning tube 16.
Described ash inlet tube 1 is arranged in the top of high temperature ash material chamber 2, be communicated with by the bottom perforate of returning grey dividing plate 14 between high temperature ash material chamber 2 and the ash distributing chamber 3, high temperature ash returning tube 4 is arranged in the sidewall of ash distributing chamber 3 and is connected with boiler furnace, high temperature returns that the bottom perforate by split-flow baffles 15 is communicated with between grey chamber 3 and the high temperature heat exchange bed 5, high temperature heat exchange bed 5, low-temperature heat exchange bed 6, low temperature feed back chamber 13 are communicated with by dividing plate 10 tops respectively, arrange low temperature ash returning tube 16 and be connected with boiler furnace on the sidewall of low temperature feed back chamber 13.
Described fluidisation air compartment 11 is separated into and high temperature ash material chamber 2, ash distributing chamber 3, high temperature heat exchange bed 5, low-temperature heat exchange bed 6, low temperature feed back chamber 13 corresponding separating chambers by air compartment baffle 12, and the fluidized wind that can adjust air quantity is arranged respectively at the bottom of each air compartment.The bottom of described high temperature recycling chamber 2 is provided with side-blown airduct 17.
In the described high temperature heat exchange bed 5 high-temperature heat exchanger 7 is arranged, in the described low-temperature heat exchange bed 6 low temperature heat exchanger 21 is arranged.
The utlity model has following advantage:
1. incorporate cramped construction, arrangement convenience when being applied to large circulating fluidized bed boiler can satisfy the arrangement requirement of the various type of furnaces, and makes boiler have good steam temperature control characteristic, bed temperature control characteristic and load operation characteristic;
2. reach and regulate high temperature and return the purpose that ash amount and low temperature return grey flow by regulating the fluidisation air quantity, make that the ash amount is distributed rationally, adjusting is flexible, easy and simple to handle;
3. whole heat exchanger mechanical rotating part, investment, operation and maintenance cost are low;
4. material low speed fluidization operation in heat exchange bed makes the heat exchanger wearing and tearing little, and long service life has realized shunting, heat exchange and the loop back function of circulating ash simultaneously, and Flow of Goods and Materials is abundant in the high temperature heat exchange bed, and the heat exchanger effectiveness height is good in economic efficiency.
Below in conjunction with accompanying drawing embodiment of the present utility model is described further:
Fig. 1 is a compact splitting-type returning ash heat exchanger stereochemical structure cutaway view;
Fig. 2 is the cutaway view of compact splitting-type returning ash heat exchanger;
Fig. 3 is that the A-A of Fig. 2 is to view;
Fig. 4 is that the B-B of Fig. 2 is to view;
When Fig. 5 is applied to large circulating fluidized bed boiler for compact splitting-type returning ash heat exchanger and the connection diagram of system.
The ash inlet tube 1 of this compact splitting-type returning ash heat exchanger is arranged in the top of high temperature ash material chamber 2, be communicated with by the bottom perforate of returning grey dividing plate 14 between high temperature ash material chamber 2 and the ash distributing chamber 3, high temperature ash returning tube 4 is arranged in the sidewall of ash distributing chamber 3 and is connected with boiler furnace, high temperature returns that the bottom perforate by split-flow baffles 15 is communicated with between grey chamber 3 and the high temperature heat exchange bed 5, high temperature heat exchange bed 5, low-temperature heat exchange bed 6, low temperature feed back chamber 13 is communicated with by dividing plate 10 top perforates respectively, on the sidewall of low temperature feed back chamber 13, arrange low temperature ash returning tube 16 and be connected with boiler furnace, make high temperature ash material chamber 2, ash distributing chamber 3, heat exchange bed 5,6 and low temperature feed back chamber 13 mutually the next-door neighbour be combined into one, their bottom all is furnished with air distribution plate 18, fluidisation air compartment 11, fluidisation air compartment 11 is separated into and high temperature ash material chamber 2 by air compartment baffle 12, ash distributing chamber 3, high temperature heat exchange bed 5, low-temperature heat exchange bed 6, low temperature feed back chamber 13 corresponding separating chambers, the fluidized wind that can adjust air quantity is arranged respectively at the bottom of each air compartment.The bottom of described high temperature recycling chamber 2 is provided with side-blown airduct 17.High-temperature heat exchanger 7 is arranged in the high temperature heat exchange bed 5, low temperature heat exchanger 21 is arranged in the low-temperature heat exchange bed 6, the high temperature heat exchange bed is provided with horizontally disposed inlet header 8 and outlet header 9.The low-temperature heat exchange bed is provided with horizontally disposed inlet header 19, outlet header 20
The operation principle of compact splitting-type returning ash heat exchanger is that ash distributing chamber utilizes rational structure and air distribution to be split into two parts from the circulating ash of whirlwind separator, a part flows to high temperature ash returning tube 4 and returns burner hearth as high temperature ash (850～950 ℃), another part then flows to the high temperature heat exchange bed 5 that is furnished with heat exchanger 7 by split-flow baffles 15 bottom perforates, ash and high-temperature heat exchanger and fluidization air carry out heat exchange within it, fluidized wind carries ash particle and streamed partition wall 10 from the top of high temperature heat exchange bed 5 and enter low-temperature heat exchange bed 6 then, flow into low temperature feed back chamber 13 at last, the ash particle that is cooled to 400～550 ℃ returns burner hearth by low temperature ash returning tube 16.
Heat exchanger in high temperature heat exchange bed 5 and the low-temperature heat exchange bed 6 adopts the coiled pipe structure, as the superheater or the part evaporating heating surface of boiler.Fluidisation air quantity Q in the heat exchange bed
4, Q
5Guarantee that fluidizing velocity is 0.3～0.6m/s.
Fluidisation air quantity Q
1, Q
3The material that guarantees grey standpipe 1 can be back in the ash distributing chamber 3.
Boiler changes the fluidisation air quantity Q that enters in ash distributing chamber 3 and the low temperature feed back chamber 13 in running
2, Q
6Can change into stove high temperature ash and the grey flow proportional that enters heat exchange bed, the heat exchanger caloric receptivity in the heat exchange bed is changed, reach the purpose of regulating bed temperature in steam temperature (if interior superheater or the reheater arranged of heat exchange bed) and the stove.
In the present embodiment, the heat exchanger of arranging in the compact splitting-type returning ash heat exchanger is one, two-stage superheater SH1, SH2.1, SH2.2 and one-level reheater RH.1 are as shown in Figure 5, compact splitting-type returning ash heat exchanger 24 is by fluidisation blower fan 22, feed back blower fan 23 air feeds, the smoke evacuation of boiler 26 separates by cyclone separator 25, the high temperature ash that cyclone separator 25 is separated enters heat exchanger 24 and carries out work, and the flue gas that cyclone separator is separated is through back-end ductwork 27, finishing superheater 28, secondary reheater 29, economizer 30 and a wind air preheater 30, boiler is discharged in secondary wind air preheater 32 backs.
Claims (5)
1. compact splitting-type returning ash heat exchanger, comprise ash inlet tube (1), high temperature ash returning tube (4), heat exchange bed (5,6), heat exchanger (7,21), low temperature ash returning tube (16), it is characterized in that ash inlet tube (1) is communicated with high temperature ash material chamber (2), high temperature ash material chamber (2) is communicated with by returning grey dividing plate (14) with ash distributing chamber (3), the ash distributing chamber (3) that carries out the ash distribution by the adjusting fluidized wind sends into ash high temperature ash returning tube (4) and sends into heat exchange bed (5 through split-flow baffles (15), 6) in, heat exchange bed (5,6) and low temperature feed back chamber (13) arrange successively, described high temperature ash material chamber (2), ash distributing chamber (3), heat exchange bed (5,6) and low temperature feed back chamber (13) mutually the next-door neighbour be combined into one, their bottom all is furnished with air distribution plate (18), fluidisation air compartment (11) and air compartment baffle (12), be furnished with heat exchanger (7 in the heat exchange bed, 21), low temperature feed back chamber (13) are provided with low temperature ash returning tube (16).
2. compact splitting-type returning ash heat exchanger according to claim 1, it is characterized in that described ash inlet tube (1) is arranged in the top of high temperature ash material chamber (2), be communicated with by the bottom perforate of returning grey dividing plate (14) between high temperature ash material chamber (2) and the ash distributing chamber (3), high temperature ash returning tube (4) is arranged in the sidewall of ash distributing chamber (3) and is connected with boiler furnace, high temperature returns that the bottom perforate by split-flow baffles (15) is communicated with between grey chamber (3) and the high temperature heat exchange bed (5), high temperature heat exchange bed (5), low-temperature heat exchange bed (6), low temperature feed back chamber (13) is communicated with by dividing plate (10) top respectively, arranges low temperature ash returning tube (16) and be connected with boiler furnace on the sidewall of low temperature feed back chamber (13).
3. compact splitting-type returning ash heat exchanger according to claim 1 and 2, it is characterized in that described fluidisation air compartment (11) is separated into and high temperature ash material chamber (2), ash distributing chamber (3), high temperature heat exchange bed (5), low-temperature heat exchange bed (6), the corresponding separating chamber in low temperature feed back chamber (13) by air compartment baffle (12), the fluidized wind that can adjust air quantity is arranged respectively at the bottom of each air compartment.
4. compact splitting-type returning ash heat exchanger according to claim 2 is characterized in that the bottom of described high temperature recycling chamber (2) is provided with side-blown airduct (17).
5. compact splitting-type returning ash heat exchanger according to claim 4 is characterized in that high-temperature heat exchanger (7) is arranged in the described high temperature heat exchange bed (5), and low temperature heat exchanger (21) is arranged in the described low-temperature heat exchange bed (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00238546 CN2427739Y (en) | 2000-06-28 | 2000-06-28 | Compact type bypass flow and dust returning-back heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00238546 CN2427739Y (en) | 2000-06-28 | 2000-06-28 | Compact type bypass flow and dust returning-back heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2427739Y true CN2427739Y (en) | 2001-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00238546 Expired - Lifetime CN2427739Y (en) | 2000-06-28 | 2000-06-28 | Compact type bypass flow and dust returning-back heat exchanger |
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|---|---|
| CN (1) | CN2427739Y (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100422640C (en) * | 2005-09-13 | 2008-10-01 | 中国科学院工程热物理研究所 | Circulating fluid bed ash pneumatic control distributing valve |
| CN100427825C (en) * | 2005-09-13 | 2008-10-22 | 中国科学院工程热物理研究所 | Pneumatic controlling ash-in external heat exchanger |
| CN100447486C (en) * | 2005-10-14 | 2008-12-31 | 中国科学院工程热物理研究所 | Pneumatic controlled material circulation device |
| CN101596433B (en) * | 2009-07-15 | 2011-07-06 | 中国科学院工程热物理研究所 | Cooling type clapboard for U-shaped stuff back-feeder |
| CN101311626B (en) * | 2007-05-25 | 2012-03-14 | 巴布考克及威尔考克斯公司 | Integral fluid bed ash cooler |
| CN102809150A (en) * | 2012-08-28 | 2012-12-05 | 云南电力试验研究院（集团）有限公司电力研究院 | Method for discharging slags from circulating fluidized bed boiler based on external heat exchanger |
| CN102840578A (en) * | 2011-06-23 | 2012-12-26 | 中国科学院工程热物理研究所 | Compact parallel connection type external fluidized bed heat exchanger |
| CN102840577A (en) * | 2011-06-23 | 2012-12-26 | 中国科学院工程热物理研究所 | Circulation fluidized bed boiler having compact type external dual fluidized bed heat exchanger |
| CN112377895A (en) * | 2020-11-10 | 2021-02-19 | 浙江大学 | Adjustable double-bed anti-corrosion external high-temperature superheater ash return device and method |
| CN112443834A (en) * | 2020-11-09 | 2021-03-05 | 东南大学 | Material circulation air control system of circulating fluidized bed boiler |
-
2000
- 2000-06-28 CN CN 00238546 patent/CN2427739Y/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100422640C (en) * | 2005-09-13 | 2008-10-01 | 中国科学院工程热物理研究所 | Circulating fluid bed ash pneumatic control distributing valve |
| CN100427825C (en) * | 2005-09-13 | 2008-10-22 | 中国科学院工程热物理研究所 | Pneumatic controlling ash-in external heat exchanger |
| CN100447486C (en) * | 2005-10-14 | 2008-12-31 | 中国科学院工程热物理研究所 | Pneumatic controlled material circulation device |
| CN101311626B (en) * | 2007-05-25 | 2012-03-14 | 巴布考克及威尔考克斯公司 | Integral fluid bed ash cooler |
| CN101596433B (en) * | 2009-07-15 | 2011-07-06 | 中国科学院工程热物理研究所 | Cooling type clapboard for U-shaped stuff back-feeder |
| CN102840578A (en) * | 2011-06-23 | 2012-12-26 | 中国科学院工程热物理研究所 | Compact parallel connection type external fluidized bed heat exchanger |
| CN102840577A (en) * | 2011-06-23 | 2012-12-26 | 中国科学院工程热物理研究所 | Circulation fluidized bed boiler having compact type external dual fluidized bed heat exchanger |
| CN102840577B (en) * | 2011-06-23 | 2015-03-25 | 中国科学院工程热物理研究所 | Circulation fluidized bed boiler having compact type external dual fluidized bed heat exchanger |
| 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 |
| CN102809150A (en) * | 2012-08-28 | 2012-12-05 | 云南电力试验研究院（集团）有限公司电力研究院 | Method for discharging slags from circulating fluidized bed boiler based on external heat exchanger |
| CN112443834A (en) * | 2020-11-09 | 2021-03-05 | 东南大学 | Material circulation air control system of circulating fluidized bed boiler |
| CN112443834B (en) * | 2020-11-09 | 2022-09-20 | 东南大学 | Material circulation air control system of circulating fluidized bed boiler |
| CN112377895A (en) * | 2020-11-10 | 2021-02-19 | 浙江大学 | Adjustable double-bed anti-corrosion external high-temperature superheater ash return device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20010425 |