CN103672918A - Circulating fluidized bed waste incineration boiler and flue gas cooling chamber for same - Google Patents
Circulating fluidized bed waste incineration boiler and flue gas cooling chamber for same Download PDFInfo
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- CN103672918A CN103672918A CN201310750144.4A CN201310750144A CN103672918A CN 103672918 A CN103672918 A CN 103672918A CN 201310750144 A CN201310750144 A CN 201310750144A CN 103672918 A CN103672918 A CN 103672918A
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Abstract
The invention discloses a circulating fluidized bed waste incineration boiler and a flue gas cooling chamber for the same. The flue gas cooling chamber is arranged between a cyclone separator and a tail convection flue of the circulating fluidized bed waste incineration boiler, and comprises a top wall, peripheral sidewalls and a bottom wall, wherein the top wall and the peripheral sidewalls are membrane water-cooled walls; at least one group of suspended screen radiation overheaters is also arranged at a flue gas inlet in the cooling chamber; a steam outlet header and a steam inlet header are arranged at the two ends of the suspended screen radiation overheaters respectively. According to the circulating fluidized bed waste incineration boiler and the flue gas cooling chamber for the same, adhesive soot formation on the outer wall of the tail convection flue can be reduced, and the running stability and economy of a circulating fluidized bed boiler unit can be improved.
Description
Technical field
The present invention relates to field of boilers, relate in particular to a kind of refuse incinerator of circulating fluid bed and flue gas cooling chamber thereof.
Background technology
With reference to Fig. 1, Fig. 1 is the structured flowchart of recirculating fluidized bed (Circulating Fluidized Bed is called for short CFB) garbage burning boiler, and diagram boiler plant comprises: the burner hearth 10, cyclone separator 12, the afterbody convection pass 16 that connect successively; And cyclone separator 12 is also connected with external heat exchanger 14, the other end of this external heat exchanger connects burner hearth 10.Crude waste, through processing such as fragmentation, metal sortings, enters burner hearth 10 to take fire; The high-temperature flue gas (850～900 ℃) that burning produces enters cyclone separator 12 through the furnace outlet of upper furnace, remove most fly ash granules, these fly ash granules enter external heat exchanger 14 by returning charge leg, carry out after heat exchange with the high temperature superheater being arranged in external heat exchanger 14, then by returning charge inclined tube, get back to burner hearth 10 and continue circulation burning; Meanwhile, not separated flying dust enters in afterbody convection pass 16.
The problem existing in above-mentioned garbage burning boiler equipment is: the flue-gas temperature of separating from cyclone separator 12 is in 850 ℃～900 ℃, flue gas in this temperature range is when flowing through convection pass 16, will be cooling gradually, when flue gas cool-down to 600 ℃～800 ℃, it is easy to look unfamiliar into caking property dust stratification at walling of flue.And caking property dust stratification is harmful to very much.
Summary of the invention
In view of this, the present invention is intended to propose a kind of refuse incinerator of circulating fluid bed and cooling chamber thereof, to reduce the generation of afterbody convection pass caking property dust stratification, improves stability and the economy of Circulating Fluidized Bed Boilers operation.
First aspect, the invention discloses a kind of flue gas cooling chamber, this flue gas cooling chamber is arranged between the cyclone separator and afterbody convection pass of refuse incinerator of circulating fluid bed, comprise roof, surrounding sidewall and diapire, described roof and described surrounding sidewall are fin panel casing, and the gas approach place of this cooling chamber is also provided with at least one group of hanging screen radiant superheater; The two ends of hanging screen radiant superheater are steam (vapor) outlet header and steam inlet header.
Further, in above-mentioned flue gas cooling chamber, also comprise a plurality of soot blowers; The spout of described each soot blower downwards and be parallel to described hanging screen radiant superheater.
Further, in above-mentioned flue gas cooling chamber, the shower nozzle of described soot blower is rotatable and scalable.
Further, in above-mentioned flue gas cooling chamber, also comprise temperature measuring equipment, be affixed on described hanging screen radiant superheater; Described soot blower is connected with described temperature measuring equipment signal, for the vapor (steam) temperature at described hanging screen radiant superheater, during lower than predetermined temperature, carries out the purging of dust stratification.
Further, in above-mentioned flue gas cooling chamber, described hanging screen radiant superheater is U-shaped; Described steam (vapor) outlet header and described steam inlet header are arranged at the two ends of described hanging screen radiant superheater.
Further, in above-mentioned flue gas cooling chamber, described hanging screen radiant superheater is single tube bundle structure.
Further, in above-mentioned flue gas cooling chamber, also comprise sealing and fixture, be arranged in the top of described hanging screen radiant superheater, for the place through walls of described hanging screen radiant superheater is sealed, and, the lifting of hanging screen radiant superheater is fixed.
Further, in above-mentioned flue gas cooling chamber, described cooling chamber middle part is also provided with a vertical direction, has the partition wall of membrane wall structure, and described partition wall is divided into the rear chamber near cup and the close described afterbody convection pass of described separator by described cooling chamber.
The present invention arranges hanging screen radiant superheater by the gas approach place at cooling chamber, can make working medium become superheated steam from saturated vapor, simultaneously in conjunction with cooling chamber surrounding heating surface, making to enter afterbody convection pass heating surface flue-gas temperature is reduced to below 600 ℃, avoid the high temperature bond dust stratification problem of afterbody convection heating surface tube bank, improve the controllability of boiler continuous operating time and vapor (steam) temperature.And with respect to convection superheater design, hanging screen radiant superheater heat transfer intensity is large, can reduce the required steel consumption of unit steam temperature rise, and not be subject to the restriction of structural configuration.
Second aspect, the invention also discloses a kind of refuse incinerator of circulating fluid bed, is provided with above-mentioned flue gas cooling chamber.Because structure and the technique effect thereof of cooling chamber have been done detailed explanation in the above, therefore do not repeat them here.
Accompanying drawing explanation
The accompanying drawing that forms a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is in correlation technique, circulating fluid bed garbage furnace structured flowchart;
Fig. 2 is the structural representation of flue gas cooling chamber preferred embodiment of the present invention.
Description of reference numerals
1 steam (vapor) outlet header
2 steam inlet headers
3 hanging screen radiant superheaters
4 soot blowers
5 temperature measuring equipments
6 sealing and fixtures
7 cups
8 rear chambers
9 convection heating surfaces
The specific embodiment
It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the present invention can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
With reference to Fig. 2, the preferred embodiment of flue gas cooling chamber of the present invention is elaborated.
The present embodiment flue gas cooling chamber is arranged between the cyclone separator and afterbody convection pass of refuse incinerator of circulating fluid bed, comprise roof, surrounding sidewall and diapire, roof and surrounding sidewall are fin panel casing, and the gas approach place in this cooling chamber is also provided with at least one group of hanging screen radiant superheater 3; The two ends of hanging screen radiant superheater 3 are steam (vapor) outlet header 1 and steam inlet header 2.
In the present embodiment, cooling chamber import department arranges four groups of hanging screen radiant superheaters 3, and hanging screen radiant superheater 3 is single tube bundle structure; Hanging screen radiant superheater 3 is U-shaped; Steam (vapor) outlet header 1 and steam inlet header 2 are arranged at the two ends of U-shaped hanging screen radiant superheater 3.
The present embodiment arranges hanging screen radiant superheater by the gas approach place at cooling chamber, can make working medium become superheated steam from saturated vapor, simultaneously in conjunction with cooling chamber surrounding heating surface, making to enter afterbody convection pass heating surface flue-gas temperature is reduced to below 600 ℃, avoid the high temperature bond dust stratification problem of afterbody convection heating surface tube bank, improve the modulability of boiler continuous operating time and vapor (steam) temperature.And with respect to convection superheater design in prior art, hanging screen radiant superheater heat transfer intensity is large, can reduce the required steel consumption of unit steam temperature rise, and not be subject to the restriction of structural configuration.
In the present embodiment, flue gas cooling chamber also comprises a plurality of soot blowers 4; The spout of each soot blower 4 downwards and to be parallel to described hanging screen radiant type overheated by 3.The shower nozzle of soot blower 4 is rotatable and scalable.From cyclone separator, flue gas flow direction is out hung screen radiant superheater 3 longitudinally, because soot blower spout is downward and be parallel to the pipeline that radiant superheater is shielded in hanging, therefore, greatly reduce cooling chamber operation flue gas resistance and blower fan system energy consumption, further improved boiler operatiopn stability.
And, hanging screen radiant superheater coordinates with soot blower, hanging screen radiant superheater is not easy dust stratification, therefore can guarantee flue gas cooling chamber and the effective heat exchange of high-temperature flue gas and the effective temperature rise requirement of Boiler Steam, has avoided dust stratification and the vapor (steam) temperature that causes such as does not reach at the practical problem.Because soot blower 4 is steam blast device, to compare with traditional gas impulse bow wave soot blower, steam blast device unit volume space purges low by energy consumption.
The present embodiment flue gas cooling chamber also comprises temperature measuring equipment 5, and it is affixed on the wall of hanging screen radiant superheater 3; The temperature blowing deposited dust of steam in the hanging screen radiant superheater 3 that soot blower 4 records according to temperature measuring equipment 5.That is to say, the dust stratification situation of hanging screen radiant superheater 3 can detect according to temperature measuring equipment 5: when tube wall temperature reaches while needing winding-up to require, soot blower 4 is opened automatic sprayings.In other words, the vapor (steam) temperature in hanging screen radiant superheater 3 during lower than predetermined temperature, is carried out the purging of dust stratification.
Temperature measuring equipment 5 is connected with soot blower 4 signals, and the combination of the two, has realized the automatic blowing method of operation, greatly alleviates operations staff's labour intensity.
Below the operation principle of flue gas cooling chamber is described.
Boiler drum saturated vapor out enters steam inlet header 2, then by the overheated tube panel 3 of half following current half adverse current radiant type, carry out the main heat exchange with radiation mode with high-temperature flue gas, make working medium be promoted to required superheat steam temperature from saturation temperature, then by steam (vapor) outlet header 1, flow out superheated steam system.The temperature measuring equipment 5 of arranging in flue gas cooling chamber superheater detects the temperature of the interior steam of tube wall of hanging screen radiant superheater 3 run durations, according to the program setting, when detected temperatures reaches while needing soot blower winding-up temperature, to automatically start 4 pairs of tube banks of soot blower and purge deashing, when temperature measuring equipment feedback temperature reaches setting value, soot blower will stop automatically.
Sealing and fixture 6 are arranged in the top of hanging screen radiant superheater 3, for the place through walls of hanging screen radiant superheater 3 is sealed, and the lifting of hanging screen radiant superheater 3 are fixed.
In addition, in the present embodiment, cooling chamber middle part is also provided with a vertical direction, has the partition wall of membrane wall structure, and partition wall is divided into the rear chamber 8 near cup 7 and the close afterbody convection pass of separator by cooling chamber.In rear chamber 8, be provided with a plurality of convection heating surfaces 9.The benefit of design is that, by having the partition wall of film water cold wall structure, further mode and the high-temperature flue gas by radiation carries out heat exchange like this.More importantly, design, can improve flue gas cooling chamber and the structural behaviour of afterbody convection pass when being connected like this.
Second aspect, the present invention also provides a kind of refuse incinerator of circulating fluid bed, comprises the burner hearth, cyclone separator and the afterbody convection pass that connect successively, and the returning charge mouth of cyclone separator is also connected with burner hearth; And, between cyclone separator and afterbody convection pass, be also provided with above-mentioned flue gas cooling chamber.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. a flue gas cooling chamber, is characterized in that, is arranged between the cyclone separator and afterbody convection pass of refuse incinerator of circulating fluid bed, comprises roof, surrounding sidewall and diapire, and described roof and described surrounding sidewall are fin panel casing, and,
Gas approach place in this cooling chamber is also provided with at least one group of hanging screen radiant superheater (3);
The two ends of hanging screen radiant superheater are steam (vapor) outlet header (1) and steam inlet header (2).
2. flue gas cooling chamber according to claim 1, is characterized in that,
Also comprise a plurality of soot blowers (4);
The spout of described each soot blower (4) downwards and be parallel to described hanging screen radiant superheater.
3. flue gas cooling chamber according to claim 2, is characterized in that,
The shower nozzle of described soot blower is scalable and rotatable.
4. according to any one flue gas cooling chamber described in claim 2 or 3, it is characterized in that, also comprise:
Temperature measuring equipment (5), is affixed on described hanging screen radiant superheater (3); Described soot blower (4) is connected with described temperature measuring equipment (5) signal, for the vapor (steam) temperature at described hanging screen radiant superheater (3), during lower than predetermined temperature, carries out the purging of dust stratification.
5. flue gas cooling chamber according to claim 4, is characterized in that,
Described hanging screen radiant superheater (3) is U-shaped;
Described steam (vapor) outlet header (1) and described steam inlet header (2) are arranged at the two ends of described hanging screen radiant superheater (3).
6. flue gas cooling chamber according to claim 5, is characterized in that,
Described hanging screen radiant superheater (3) is single tube bundle structure.
7. flue gas cooling chamber according to claim 6, is characterized in that,
Also comprise sealing and fixture (6), be arranged in the top of described hanging screen radiant superheater (3), for the place through walls of described hanging screen radiant superheater (3) is sealed, and the lifting of hanging screen radiant superheater (3) is fixed.
8. flue gas cooling chamber according to claim 7, is characterized in that,
Described cooling chamber middle part is also provided with a vertical direction, has the partition wall of membrane wall structure, and described partition wall is divided into the rear chamber (8) near cup (7) and the close described afterbody convection pass of described separator by described cooling chamber.
9. a refuse incinerator of circulating fluid bed, comprise the burner hearth, cyclone separator and the afterbody convection pass that connect successively, and the returning charge mouth of cyclone separator is also connected with burner hearth; It is characterized in that,
Between described cyclone separator and described afterbody convection pass, be also provided with the flue gas cooling chamber as described in any one in claim 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310750144.4A CN103672918A (en) | 2013-12-31 | 2013-12-31 | Circulating fluidized bed waste incineration boiler and flue gas cooling chamber for same |
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| CN201310750144.4A CN103672918A (en) | 2013-12-31 | 2013-12-31 | Circulating fluidized bed waste incineration boiler and flue gas cooling chamber for same |
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Cited By (1)
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| CN108006664A (en) * | 2017-12-30 | 2018-05-08 | 上海康恒环境股份有限公司 | A kind of reversible type refuse incineration exhaust-heating boiler superheater |
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| CN108006664A (en) * | 2017-12-30 | 2018-05-08 | 上海康恒环境股份有限公司 | A kind of reversible type refuse incineration exhaust-heating boiler superheater |
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Application publication date: 20140326 |