CN105841136A - Coal economizer system for boiler SCR denitrification - Google Patents
Coal economizer system for boiler SCR denitrification Download PDFInfo
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- CN105841136A CN105841136A CN201610336222.XA CN201610336222A CN105841136A CN 105841136 A CN105841136 A CN 105841136A CN 201610336222 A CN201610336222 A CN 201610336222A CN 105841136 A CN105841136 A CN 105841136A
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- inlet header
- coal economizer
- economizer
- header
- flue
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
- F22D1/12—Control devices, e.g. for regulating steam temperature
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses a coal economizer system for boiler SCR denitrification. The coal economizer system comprises a superheater side coal economizer arranged in a tail flue; and the superheater side coal economizer comprises an inlet header, an intermediate header and multiple rows of tube panels for connecting the inlet header with the intermediate header. The coal economizer system is characterized in that two separation boards are connected with the middle of the inlet header; the upper ends of the two separation boards are positioned between the inlet header and the intermediate header; the multiple rows of tube panels are separately arranged between each separation board and the adjacent side wall of the tail flue; an empty flue is arranged between the two separation boards; the lower ends of the two separation boards are positioned under the inlet header; and more than one flue gas regulating baffle is arranged at each of two sides of each separation board below the inlet header. The coal economizer system disclosed by the invention is simpler in structure and low in cost; in addition, under various load conditions, the temperature raising effect is good, the flow speed of flue gases can be controlled, and the service life can be prolonged; and the coal economizer system is particularly suitable for furnace profiles of which the superheater side coal economizer and a reheater side coal economizer are arranged in a flue separating form.
Description
Technical field
The present invention 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
It is an object of the invention to 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, the economizer system for boiler SCR denitration of the present invention, 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, and 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；The present invention not only structure is relatively simple, low cost, and equal temperature rise effect is good under various loading condictions；
As a further improvement on the present invention, 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 a further improvement on the present invention, 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, the present invention 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 be existing superheater side economizer front view.
Fig. 2 is the top view of the embodiment of the present invention.
Fig. 3 is the right view of Fig. 2.
Detailed description of the invention
The present invention is further detailed explanation below in conjunction with the accompanying drawings.
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 hang on the girder steel outside body of heater by steel part, and the tube panel between former two dividing plates 6 is rearranged to two dividing plate 6 both sides；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；nullWhen 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，Without tube panel 5 between two dividing plates 6，Its spacing can reduce，Be conducive to improving flue gas flow rate，Flue gas flow rate nor affects on the tube panel life-span soon，Do not limited by economizer peak，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；The present invention 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 |
|---|---|---|---|
| CN201610336222.XA CN105841136A (en) | 2016-05-20 | 2016-05-20 | Coal economizer system for boiler SCR denitrification |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610336222.XA CN105841136A (en) | 2016-05-20 | 2016-05-20 | Coal economizer system for boiler SCR denitrification |
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| CN105841136A true CN105841136A (en) | 2016-08-10 |
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| CN201610336222.XA Pending CN105841136A (en) | 2016-05-20 | 2016-05-20 | Coal economizer system for boiler SCR denitrification |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525088A (en) * | 2017-10-18 | 2017-12-29 | 中国华电科工集团有限公司 | A kind of deashing device and operation method for the low low-level (stack-gas) economizer of thermal power plant |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10232002A (en) * | 1996-12-17 | 1998-09-02 | Babcock Hitachi Kk | Boiler |
| CN104548932A (en) * | 2015-01-08 | 2015-04-29 | 上海电力股份有限公司吴泾热电厂 | Fume temperature coordination type wide load denitrification system |
| CN104613809A (en) * | 2014-10-30 | 2015-05-13 | 上海明华电力技术工程有限公司 | Built-in flue smoke amount distributing control system of economizer |
| CN105202556A (en) * | 2015-10-14 | 2015-12-30 | 中国华能集团清洁能源技术研究院有限公司 | Boiler tail flue structure capable of adjusting temperature of main steam and reheated steam and flue gas temperature |
| CN105546562A (en) * | 2016-01-29 | 2016-05-04 | 上海久试电力技术有限公司 | Flue and control method for controlling smoke temperature and improvement method for flue |
| CN205782832U (en) * | 2016-05-20 | 2016-12-07 | 陈增宏 | Economizer system for boiler SCR denitration |
-
2016
- 2016-05-20 CN CN201610336222.XA patent/CN105841136A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10232002A (en) * | 1996-12-17 | 1998-09-02 | Babcock Hitachi Kk | Boiler |
| CN104613809A (en) * | 2014-10-30 | 2015-05-13 | 上海明华电力技术工程有限公司 | Built-in flue smoke amount distributing control system of economizer |
| CN104548932A (en) * | 2015-01-08 | 2015-04-29 | 上海电力股份有限公司吴泾热电厂 | Fume temperature coordination type wide load denitrification system |
| CN105202556A (en) * | 2015-10-14 | 2015-12-30 | 中国华能集团清洁能源技术研究院有限公司 | Boiler tail flue structure capable of adjusting temperature of main steam and reheated steam and flue gas temperature |
| CN105546562A (en) * | 2016-01-29 | 2016-05-04 | 上海久试电力技术有限公司 | Flue and control method for controlling smoke temperature and improvement method for flue |
| CN205782832U (en) * | 2016-05-20 | 2016-12-07 | 陈增宏 | Economizer system for boiler SCR denitration |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525088A (en) * | 2017-10-18 | 2017-12-29 | 中国华电科工集团有限公司 | A kind of deashing device and operation method for the low low-level (stack-gas) economizer of thermal power plant |
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Application publication date: 20160810 |