CN205782832U - Economizer system for boiler SCR denitration - Google Patents
Economizer system for boiler SCR denitration Download PDFInfo
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- CN205782832U CN205782832U CN201620462099.1U CN201620462099U CN205782832U CN 205782832 U CN205782832 U CN 205782832U CN 201620462099 U CN201620462099 U CN 201620462099U CN 205782832 U CN205782832 U CN 205782832U
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Abstract
The utility model discloses a kind of economizer system for boiler SCR denitration, including the superheater side economizer being located in back-end ductwork, superheater side economizer includes inlet header, intermediate header and connects several comb screens of inlet header and intermediate header, it is characterized in that in the middle part of inlet header, be connected with two dividing plates, the upper end of two dividing plates is between inlet header and intermediate header, number comb screen is respectively placed between every piece of dividing plate and neighbouring back-end ductwork sidewall, is empty flue between two dividing plates；The lower end of two dividing plates is positioned at below inlet header, and every piece of dividing plate both sides below inlet header are equipped with the gas proportioning damper of more than a piece.This utility model not only structure is relatively simple, low cost, and under various loading condictions, equal temperature rise effect is good, flue gas flow rate is controlled, can increase the service life, and is particularly well-suited to superheater side economizer and reheater side economizer is to separate the type of furnace that flue is arranged.
Description
Technical field
This utility model relates to a kind of economizer system for boiler SCR denitration.
Background technology
Along with the raising day by day that boiler discharged nitrous oxides is required, selective catalytic reduction (i.e. SCR) is widely used in various coal-burning boiler, the core of this technology is to ensure that economizer exit (i.e. SCR absorption tower entrance) flue-gas temperature >=300 DEG C, it is ensured that catalyst works in the temperature window of safety.Boiler of power plant has a large portion not reach this numerical value when 60% load at present, to being nearly all less than this temperature value during 50% load.For improving economizer exit flue-gas temperature, the economizer that existing boiler width load takes off mainly has following several: 1) increase economizer feed water by-pass；2) No. 1 in hyperbaric heating system is high add after set up No. 0 high-pressure heater again, when load reduction, No. 0 high adding, puts into operation, improve inflow temperature；3) by economizer classification；4) external gas bypass；5) flue gas multiple flow passages is set in；First 3 kinds belong to and transform water side, and not only structure is complex, and cost is high, and the lifting to cigarette temperature is limited, only 7～8 DEG C；4th kind is, by bypass flue, the partial fume in economizer front is introduced SCR absorption tower, and its shortcoming is: insufficient space drawn by economizer top flue, causes the sectional area ratio flowing through bypass flue inadequate；The flow resistance that the elbow of bypass flue is formed is more than the resistance with economizer tube bank；It is the most inconspicuous that above-mentioned 2 reasons cause cigarette temperature to promote；The structure of the 5th kind is as shown in Figure 1, including the inlet header 12 being located in back-end ductwork, intermediate header 13 and the several comb screens 14 connecting inlet header and intermediate header, two dividing plates 15 it are connected with in the middle part of inlet header 12, the both sides of every piece of dividing plate 15 are located at by number comb screen 14, are equipped with gas proportioning damper 16 between every piece of dividing plate 15 and neighbouring back-end ductwork sidewall；During use, when boiler load height, gas proportioning damper 16 all opens suitable angle, flue gas and the heat exchange of all tube panels 14, remains to meet the requirement of outlet cigarette temperature；When boiler load is relatively low, gas proportioning damper 16 can be progressively closed off so that flue gas only flows out between two dividing plates 15, reduce the heat exchange with tube panel 14, with the requirement of satisfied outlet cigarette temperature；But during as being additionally provided with the reheater side economizer being arranged side by side with this economizer in back-end ductwork, when boiler load is relatively low, the exhaust gas volumn entering reheater side economizer accounts for the overwhelming majority, only fraction flue gas enters this economizer, this partial fume still can and two dividing plates 15 between tube panel 14 heat exchange, temperature rise effect is limited, and two be provided with tube panel 14 between dividing plate 15, its flue gas flow rate needs restricted, but cannot regulate, serious to washing away of tube panel 14, easy to wear, booster, affect service life, to be limited by payload, therefore, it is difficult to be applicable to superheater side economizer and reheater side economizer is to separate the type of furnace that flue is arranged.
Summary of the invention
The purpose of this utility model is for deficiencies of the prior art, a kind of economizer system for boiler SCR denitration is provided, not only structure is relatively simple for it, low cost, and under various loading condictions, equal temperature rise effect is good, flue gas flow rate is controlled, can increase the service life, and be particularly well-suited to superheater side economizer and reheater side economizer is to separate the type of furnace that flue is arranged.
For reaching above-mentioned purpose, economizer system for boiler SCR denitration of the present utility model, including the superheater side economizer being located in back-end ductwork, superheater side economizer includes inlet header, intermediate header and connects several comb screens of inlet header and intermediate header, it is characterized in that in the middle part of inlet header, be connected with two dividing plates, the upper end of two dividing plates is between inlet header and intermediate header, number comb screen is respectively placed between every piece of dividing plate and neighbouring back-end ductwork sidewall, is empty flue between two dividing plates；The lower end of two dividing plates is positioned at below inlet header, and every piece of dividing plate both sides below inlet header are equipped with the gas proportioning damper of more than a piece；
In using, when boiler is in high load capacity, the gas proportioning damper between two dividing plates is closed, and the gas proportioning damper between every piece of dividing plate and neighbouring back-end ductwork sidewall is opened, both ensure the abundant heat exchange of the tube panel of flue gas and both sides, ensured the economy of boiler, ensure that exit gas temperature；When boiler is in underload, gas proportioning damper between two dividing plates is gradually opened, gas proportioning damper between every piece of dividing plate and neighbouring back-end ductwork sidewall progressively closes off, flue gas through empty flue through to economizer exit, economizer exit cigarette temperature gets a promotion, thus ensure that the needs of SCR absorption tower inlet flue gas temperature, and flue gas does not wash away tube panel, flue gas flow rate nor affects on the tube panel life-span soon, do not limited by economizer peak, intensification fast response time, can rapidly adapt to boiler load change, the use on beneficially SCR absorption tower；This utility model not only structure is relatively simple, low cost, and equal temperature rise effect is good under various loading condictions；
As further improvement of the utility model, in back-end ductwork, it is additionally provided with the reheater side economizer being arranged side by side with superheater side economizer；Reheater side economizer also includes inlet header, outlet header and connects several comb screens of inlet header and outlet header, for conventional structure；In this type of furnace, when boiler load is relatively low, the exhaust gas volumn entering reheater side economizer accounts for the overwhelming majority, only fraction flue gas enters superheater side economizer, gas proportioning damper between two dividing plates is opened, gas proportioning damper between every piece of dividing plate and neighbouring back-end ductwork sidewall is closed, owing between two dividing plates being empty flue, not with tube panel heat exchange, flue gas through empty flue through to economizer exit, economizer exit cigarette temperature is guaranteed, the most do not wash away tube panel, can increase the service life, it is particularly well-suited to superheater side economizer and reheater side economizer is to separate the type of furnace that flue is arranged；
As further improvement of the utility model, in the middle part of the intermediate header corresponding with two dividing plates, outside is provided with heat-insulation layer；When flue gas is from when empty flue is through to economizer exit, and fume centralized washes away in the middle part of intermediate header, and heat-insulation layer can prevent intermediate header from forming metal fever deviation, and avoids the abrasion in the middle part of intermediate header, improves safety and increases the service life；
In sum, this utility model not only structure is relatively simple, low cost, and equal temperature rise effect is good under various loading condictions, flue gas flow rate is controlled, can increase the service life, and it is particularly well-suited to superheater side economizer and reheater side economizer is to separate the type of furnace that flue is arranged.
Accompanying drawing explanation
Fig. 1 is the front view of existing superheater side economizer.
Fig. 2 is the top view of this utility model embodiment.
Fig. 3 is the right view of Fig. 2.
Detailed description of the invention
Below in conjunction with the accompanying drawings this utility model is described in further detail.
As shown in Figure 2 to Figure 3, this embodiment is for the economizer system of boiler SCR denitration, including the reheater side economizer 1 being arranged side by side in back-end ductwork and superheater side economizer 2, reheater side economizer 1 includes inlet header, intermediate header and connects several comb screens of inlet header and intermediate header, for conventional structure；Superheater side economizer 2 includes inlet header 3, intermediate header 4 and connects several comb screens 5 of inlet header and intermediate header, two dividing plates 6 it are connected with in the middle part of inlet header 3, the upper end of two dividing plates 6 is between inlet header 3 and intermediate header 4, number comb screen 5 is respectively placed between every piece of dividing plate 6 and neighbouring back-end ductwork sidewall, is empty flue 11 between two dividing plates 6；The lower end of two dividing plates 6 is positioned at below inlet header 3, and every piece of dividing plate 6 both sides below inlet header 3 are equipped with several piece gas proportioning damper 7 or 8 or 9, and the gas proportioning damper 7,8,9 in triple channel is independent mutually；In the middle part of the intermediate header 4 corresponding with two dividing plates 6, outside is provided with heat-insulation layer 10, and heat-insulation layer 10 uses fire clay；
Reheater side economizer 1 and superheater side economizer 2 can be hung on the girder steel outside body of heater by steel part；In using, when boiler is in high load capacity, the exhaust gas volumn entering superheater side economizer 2 is bigger, now the gas proportioning damper 8 between two dividing plates 6 is closed, gas proportioning damper 7 and 9 between every piece of dividing plate 6 and neighbouring back-end ductwork sidewall all opens suitable aperture, has both ensured the abundant heat exchange of flue gas and the tube panel 5 of both sides, and economy is unaffected, the most controlled tobacco curing gas velocity, it is ensured that exit gas temperature；When boiler is in underload, the exhaust gas volumn entering reheater side economizer 1 accounts for about 85%, the exhaust gas volumn entering superheater side economizer 2 accounts for about 15%, now the gas proportioning damper 8 between two dividing plates 6 is opened, gas proportioning damper 7 and 9 between every piece of dividing plate 6 and neighbouring back-end ductwork sidewall is closed, flue gas through empty flue 11 through to economizer exit, due to not with tube panel heat exchange 5, economizer exit cigarette temperature gets a promotion, thus ensure that the needs of SCR absorption tower inlet flue gas temperature, and flue gas does not wash away tube panel 5, without abrasion and booster, flue gas flow rate nor affects on the tube panel life-span soon, do not limited by economizer peak flow velocity, intensification fast response time, boiler load change can be rapidly adapted to, it is beneficial to the use on SCR absorption tower；When boiler load be in high and low between time, by adjusting the aperture of gas proportioning damper 7,8,9, can reach equally and not only ensure flue-gas temperature, but also ensure the purpose of flow velocity not superelevation limit, be particularly well-suited to superheater side economizer 2 and reheater side economizer 1 be the type of furnace separating flue layout；This utility model not only structure is relatively simple, low cost, and the load scope of application is wider, has the possibility realizing full load denitration；Heat-insulation layer 10 can prevent intermediate header 4 from forming metal fever deviation, and avoids the abrasion in the middle part of intermediate header 4, improves safety and increases the service life.
Claims (3)
1. the economizer system for boiler SCR denitration, including the superheater side economizer being located in back-end ductwork, superheater side economizer includes inlet header, intermediate header and connects several comb screens of inlet header and intermediate header, it is characterized in that in the middle part of inlet header, be connected with two dividing plates, the upper end of two dividing plates is between inlet header and intermediate header, number comb screen is respectively placed between every piece of dividing plate and neighbouring back-end ductwork sidewall, is empty flue between two dividing plates；The lower end of two dividing plates is positioned at below inlet header, and every piece of dividing plate both sides below inlet header are equipped with the gas proportioning damper of more than a piece.
2. the economizer system for boiler SCR denitration as claimed in claim 1, it is characterised in that be additionally provided with the reheater side economizer being arranged side by side with superheater side economizer in back-end ductwork.
3. the economizer system for boiler SCR denitration as claimed in claim 1 or 2, it is characterised in that outside is provided with heat-insulation layer in the middle part of the intermediate header corresponding with two dividing plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620462099.1U CN205782832U (en) | 2016-05-20 | 2016-05-20 | Economizer system for boiler SCR denitration |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620462099.1U CN205782832U (en) | 2016-05-20 | 2016-05-20 | Economizer system for boiler SCR denitration |
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| CN205782832U true CN205782832U (en) | 2016-12-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105841136A (en) * | 2016-05-20 | 2016-08-10 | 陈增宏 | Coal economizer system for boiler SCR denitrification |
| CN107270320A (en) * | 2017-08-04 | 2017-10-20 | 哈尔滨红光锅炉总厂有限责任公司 | A kind of economizer of variable cross section regulation |
-
2016
- 2016-05-20 CN CN201620462099.1U patent/CN205782832U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105841136A (en) * | 2016-05-20 | 2016-08-10 | 陈增宏 | Coal economizer system for boiler SCR denitrification |
| CN107270320A (en) * | 2017-08-04 | 2017-10-20 | 哈尔滨红光锅炉总厂有限责任公司 | A kind of economizer of variable cross section regulation |
| CN107270320B (en) * | 2017-08-04 | 2023-08-15 | 哈尔滨红光锅炉总厂有限责任公司 | Economizer with adjustable cross section |
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