CN204816208U - Outer SNCR denitrification facility of layer furnace stove - Google Patents
Outer SNCR denitrification facility of layer furnace stove Download PDFInfo
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- CN204816208U CN204816208U CN201520364439.2U CN201520364439U CN204816208U CN 204816208 U CN204816208 U CN 204816208U CN 201520364439 U CN201520364439 U CN 201520364439U CN 204816208 U CN204816208 U CN 204816208U
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- dividing plate
- furnace
- flue
- heat transfer
- convection
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Abstract
The utility model provides an outer SNCR denitrification facility of layer furnace stove, include: furnace, furnace upper portion is equipped with thermoregulation mechanism, radiation heat transfer district and flue gas passageway along flue gas advancing direction, flue gas passageway and convection bank district's binding, convection bank district and afterbody flue are connected, economizer and heat exchanger have been arranged in proper order along flue gas advancing direction in the afterbody flue, thermoregulation mechanism is the adjustable radiation baffle that shelters from for become adjustable heat transfer area with the fixed heat transfer area in the furnace. The utility model discloses simple structure, convenient operation can become variable radiation heat transfer area with the fixed radiation heat transfer area in the furnace, guarantees to satisfy the optimum response temperature requirement of SNCR denitration technology in the flue -gas temperature in furnace exit to improve out of stock efficiency.
Description
Technical field
The utility model patent relates to pulverized-coal fired boiler field, particularly relates to the outer SNCR denitration device of a kind of grate furnace stove.
Background technology
SNCR (selectivenon-catalyticreduction, SNCR) method denitration is the NO not adopting any means of catalysis
x+ NH
3--→ N
2+ H
2the technique of o, be now widely used in the denitrating technique of CFBB, denitration efficiency can reach more than 70%, has reliable, small investment, and the later stage is run and pollutes little advantage, is the preferred option of the denitration of CFBB.
But, the Process window of SNCR method denitration is not had in body design due to the grate firing boiler of prior art, therefore, if grate firing boiler adopts the denitration of SNCR method, its out of stock efficiency is generally about 30 ~ 40%, cannot meet the requirement of environmental protection, therefore generally in grate firing boiler adopt the denitration of SCR method, but adopt in grate firing boiler that SCR method denitrification investment is high, operating cost is expensive, the later stage run pollute large.
Utility model content
The utility model, for the problems referred to above weak point, provides a kind of grate furnace stove outer SNCR denitration device, solves its problem that out of stock efficiency is low, equipment is complicated and cost is high of denitrification apparatus of the prior art.
The technical solution of the utility model is achieved in that
The outer SNCR denitration device of a kind of grate furnace stove, comprise: burner hearth, described upper furnace is provided with thermoregulation mechanism, radiation heat transfer district and exhaust gases passes along flue gas direct of travel, described exhaust gases passes and convection bank district link, described convection bank district is connected with back-end ductwork entrance, be furnished with economizer and heat exchanger successively along flue gas direct of travel in described back-end ductwork, described thermoregulation mechanism is adjustable shielding radiation dividing plate, for the fixing heat exchange area in burner hearth is become adjustable heat exchange area.
Preferably, described adjustable shielding radiation dividing plate is plug-type adjustment dividing plate, hoisting type adjustment dividing plate or rotary adjustment dividing plate.
Preferably, described adjustable shielding radiation dividing plate is provided with connecting rod, described connecting rod is linked together by one end of bearing pin and adjustable shielding radiation dividing plate, the other end of described connecting rod stretches out outside body of heater through furnace wall, and be connected with adjusting handle by screw thread, adjustable shielding radiation dividing plate can be used to move by rotating adjusting handle.
Preferably, described exhaust gases passes place set temperature checkout gear, described temperature-detecting device is connected with the display unit of displays temperature, for showing the temperature at exhaust gases passes place.
Preferably, described adjustable shielding radiation dividing plate is high temperature resistant variable shutter, and described shutter comprises vane group, and the fixed frame of described shutter coordinates fixing with wall in or beyond described burner hearth.
Preferably, heat convection flue is provided with in described burner hearth, the import of described heat convection flue gas and smoke outlet are the first convection heating surface and the second convection heating surface, between adjacent described convection heating surface and described heat convection flue gas import and export place be provided with adjustable shielding radiation dividing plate.
Preferably, described shutter is ordinary carbon steel or heat-and corrosion-resistant steel alloy.
The succeed at of the SNCR denitration technique of CFBB is transplanted in the SNCR denitration process of grate firing boiler by the utility model, the weak point of improving layer combusting boiler, improve the SNCR denitration technique of grate firing boiler, radiation heat transfer face will be provided with high temperature resistant variable shutter, fixing heat exchange area can be become variable heat exchange area, ensure that the flue-gas temperature at furnace outlet place is about 950 DEG C, successfully meet the optimal reaction temperature requirement of SNCR denitration technique, in addition, because heat exchange is fiercer, the space existed in these about 950 DEG C actual boilers in region is very short, in order to give the reaction compartment that SNCR denitration technique is enough, the flue gas at furnace outlet place is guided to outside boiler, return in boiler complete out of stock reaction outside stove after.
Accompanying drawing explanation
Fig. 1 is the front view of the outer SNCR denitration device of a kind of grate furnace stove in the utility model;
Fig. 2 is the schematic diagram of the outer SNCR denitration device of a kind of grate furnace stove in the utility model;
In figure: 1, burner hearth; 2, adjustable shielding radiation dividing plate; 3, radiation heat transfer district; 4, opening; 5, convection bank district; 61, the first convection heating surface; 62, the second convection heating surface; 7, smoke-fire-tube; 8, heat convection flue; 10, fire grate; 11, exhaust gases passes; 12, rear radiation water-cooling wall; 13, combustion-supporting arch; 14, combustion zone.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Unless otherwise defined, technical term used herein or scientific terminology should be in field belonging to the utility model the ordinary meaning that the personage with general technical ability understands." first ", " second " that use in the utility model patent application specification and claims and similar word do not represent any order, quantity or importance, and are only used to distinguish different parts.Equally, the similar word such as " ", " " or " being somebody's turn to do " does not represent that quantity limits yet, but represents to there is at least one." to comprise " or the similar word such as " comprising " means to occur that element before this word or object contain the element or object that appear at this word presented hereinafter and equivalent, and do not get rid of other elements or object." on ", D score, etc. only for representing relative position relation, when be described object absolute position change after, then this relative position relation also may correspondingly change." connection " is not limited to concrete type of attachment, can be direct connection, also can be indirectly connected by miscellaneous part, it can be non-removable connection, also can be dismountable connection, can be electric or signal connection, also can be machinery or physical connection.
As shown in Fig. 1 ~ 2, the embodiment of the outer SNCR denitration device of a kind of grate furnace stove that the utility model embodiment provides, comprise: burner hearth 1, after in burner hearth 1, water-cooling wall 12 lower end part is provided with the combustion-supporting arch 13 of partition-type, and combustion-supporting arch 13 will be divided into combustion zone 14 and radiation heat transfer district 3 in stove, below burner hearth 1, outer end is provided with fire grate 10, fire grate 10 can be traveling-grate stoker, also can be reciprocal grate, fire grate rotates clockwise, and makes coal move right burning; Thermoregulation mechanism, radiation heat transfer district 3 and opening 4 is provided with along flue gas direct of travel on burner hearth 1 top, opening 4 and convection bank district 5 link, flowing bundle district 5 is connected with back-end ductwork entrance, is furnished with economizer, smoke-fire-tube 7 and heat exchanger successively in back-end ductwork along flue gas direct of travel.
Burner hearth 1 in the present embodiment is arranged in the top of the fire grate 10 of boiler front portion, radiation heat transfer district 3 is provided with in burner hearth 1, superheater (not shown) is arranged in the hori-zontal flue gas passage in radiation heat transfer district 3, radiation heat transfer district 3 is communicated with convection bank district 5 by opening 4, boiler tube bundle (not shown) is provided with in convection bank district 5, economizer is arranged in convection bank district 5, connected by steelframe, heat exchanger is arranged in the bottom of economizer, defines an exhaust gases passes 11 between radiation heat transfer district 3 and convection bank district 5.
Further, thermoregulation mechanism is adjustable shielding radiation dividing plate 2, adjustable shielding radiation dividing plate 2 is made up of resistant to elevated temperatures material, the opening and closing of adjustable shielding radiation dividing plate 2 can adopt plug-type regulative mode to regulate, also hoisting type regulative mode can be adopted, or rotary regulative mode, preferably, adjustable shielding radiation dividing plate 2 is provided with connecting rod, connecting rod is linked together by one end of bearing pin and adjustable shielding radiation dividing plate 2, the other end of connecting rod stretches out outside body of heater through furnace wall, and be connected with adjusting handle by screw thread, adjustable shielding radiation dividing plate 2 can be used to move up and down by rotating adjusting handle, for the fixing heat exchange area in burner hearth 1 is become adjustable heat exchange area, ensure that in the flue-gas temperature at exhaust gases passes 4 place be about 950 DEG C, successfully meet the optimal reaction temperature requirement of SNCR denitration technique.
Further, exhaust gases passes 4 place can set temperature checkout gear, temperature-detecting device is connected with the display unit of display inner flue gas of the stove temperature, the temperature at exhaust gases passes 4 place can be observed by display unit, when temperature is higher than 950 °, adjustable shielding radiation dividing plate 2 is rotated with first direction, make it open, reduce its radiation heat transfer area, when temperature is lower than 950 °, rotate adjustable shielding radiation dividing plate 2 with the second direction contrary with first direction, make it close, increase its radiation heat transfer area, to improve the temperature levels at exhaust gases passes 4 place.
In a particular application, the optimal reaction temperature of SNCR denitration technique is 900 ~ 1000 DEG C, the heating surface of grate firing boiler is divided into radiation heating-surface and heat convection heating surface, generally be heated based on radiation in burner hearth 1, based on heat convection after entering convection bank district 5 from the exhaust gases passes 4 of burner hearth, the temperature at exhaust gases passes 4 place is more than 900 DEG C, but due to the normal underrun of grate firing boiler, therefore the temperature at actual exhanst gas outlet 4 place is less than 900 DEG C, 900 DEG C of temperature sections often appear in burner hearth 1, therefore cannot determine that a region is 900 DEG C of fixing temperature provinces, in order to determine that a region is 900 DEG C of fixing temperature provinces, the utility model is provided with adjustable shielding radiation dividing plate 2 in radiation heat transfer district 3, described adjustable shielding radiation dividing plate 2 can choose high temperature resistant variable shutter, by adjusting louver window, fixing heat exchange area in burner hearth 1 is become adjustable heat exchange area, ensure that in the flue-gas temperature at exhanst gas outlet 4 place be about 950 DEG C, successfully meet the optimal reaction temperature requirement of SNCR denitration technique.
In a particular application, because heat exchange is fiercer, the limited space that temperature in the utility model embodiment exists in boiler about 950 DEG C region reality, in order to give the reaction compartment that SNCR denitration technique is enough, the flue gas at exhaust gases passes place 4 is guided to outside burner hearth 1 by the utility model embodiment, returns in burner hearth 1 outside burner hearth 1 after completing out of stock reaction.
In the utility model embodiment, a heat convection flue 8 is formed by the first convection heating surface 61 in Yan Qiang and cigarette wall and the second convection heating surface 62, between adjacent described convection heating surface and described heat convection flue 8 flue gas enter, exit is provided with adjustable shielding radiation dividing plate 2, adjustable shielding radiation dividing plate 2 is shutter, every layer of described shutter is made up of vane group, the blade fixed frame of described shutter and described cigarette within the walls or outer wall coordinate fixing, the utility model embodiment is when the blade of described shutter is all opened, flue gas in described heat convection flue 8 the path of process become straight tube path, heavy in section, its beneficial effect is, when specified cigarette speed, enter into after in heat convection flue 8, cigarette speed declines, the flue-gas temperature range of decrease is little, when being unlikely to make flue gas arrive exhaust gases passes 4, temperature is too low, when the described vane group of described shutter is closed, flue gas is only washed into the local often organized of convection heating surface group in described heat convection flue 8, decrease heating surface, its beneficial effect is, when boiler opens stove or runs at boiler at low load, the flue gas producing lower temperature no longer includes larger temperature drop, can ensure to the enough reaction compartments of SNCR denitration technique and temperature.
Preferably, the described shutter material in the present embodiment is ordinary carbon steel or heat-and corrosion-resistant steel alloy.
The utility model adds the flue gas flow between inlet flue duct and exhaust pass, and the chemical time that reducing agent is contacted with NOx increases; And the time of contact of denitrification reducing agent and NOx is increased, improve the uniformity that reducing agent mixes with NOx in flue gas simultaneously, adjustable shielding radiation dividing plate is provided with in radiation heat transfer district, by regulating adjustable shielding radiation dividing plate, fixing heat exchange area in burner hearth is become adjustable heat exchange area, ensure that in the flue-gas temperature of smoke outlet be about 950 DEG C, successfully meet the optimal reaction temperature requirement of SNCR denitration technique.
These are only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (7)
1. the outer SNCR denitration device of grate furnace stove, it is characterized in that, comprise: burner hearth, described upper furnace is provided with thermoregulation mechanism, radiation heat transfer district and exhaust gases passes along flue gas direct of travel, described exhaust gases passes and convection bank district link, described convection bank district is connected with back-end ductwork entrance, economizer and heat exchanger is furnished with successively along flue gas direct of travel in described back-end ductwork, described thermoregulation mechanism is adjustable shielding radiation dividing plate, for the fixing radiation heat transfer area in burner hearth is become adjustable radiation heat exchange area.
2. device as claimed in claim 1, is characterized in that, described adjustable shielding radiation dividing plate is plug-type adjustment dividing plate, hoisting type regulates dividing plate or rotary adjustment dividing plate.
3. device as claimed in claim 2, it is characterized in that, described adjustable shielding radiation dividing plate is provided with connecting rod, described connecting rod is linked together by one end of bearing pin and adjustable shielding radiation dividing plate, the other end of described connecting rod stretches out outside body of heater through furnace wall, and be connected with adjusting handle by screw thread, by rotating described adjusting handle, described adjustable shielding radiation dividing plate is moved.
4. device as claimed in claim 1, it is characterized in that, described exhaust gases passes place set temperature checkout gear, described temperature-detecting device is connected with the display unit of displays temperature, for showing the temperature at exhaust gases passes place.
5. device as claimed in claim 3, it is characterized in that, described adjustable shielding radiation dividing plate is high temperature resistant variable shutter, and described shutter comprises vane group, and the fixed frame of described shutter coordinates fixing with wall in or beyond described burner hearth.
6. device as claimed in claim 1, it is characterized in that, heat convection flue is provided with in described burner hearth, the gas approach of described heat convection flue and smoke outlet are respectively the first convection heating surface and the second convection heating surface, between adjacent described convection heating surface and the gas approach of described heat convection flue and exit be provided with described adjustable shielding radiation dividing plate.
7. device as claimed in claim 5, it is characterized in that, described shutter is ordinary carbon steel or heat-and corrosion-resistant steel alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520364439.2U CN204816208U (en) | 2015-05-29 | 2015-05-29 | Outer SNCR denitrification facility of layer furnace stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520364439.2U CN204816208U (en) | 2015-05-29 | 2015-05-29 | Outer SNCR denitrification facility of layer furnace stove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204816208U true CN204816208U (en) | 2015-12-02 |
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ID=54673851
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520364439.2U Expired - Fee Related CN204816208U (en) | 2015-05-29 | 2015-05-29 | Outer SNCR denitrification facility of layer furnace stove |
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| CN (1) | CN204816208U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104874280A (en) * | 2015-05-29 | 2015-09-02 | 孙永宏 | SNCR denitration device outside grate-fired furnace |
| CN104959011A (en) * | 2015-06-15 | 2015-10-07 | 孙永宏 | External SNCR (selective non-catalytic reduction) denitrification device of grate-fired furnace |
| CN114225682A (en) * | 2021-10-29 | 2022-03-25 | 山西昱光发电有限责任公司 | Low-load denitration method for circulating fluidized bed boiler |
-
2015
- 2015-05-29 CN CN201520364439.2U patent/CN204816208U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104874280A (en) * | 2015-05-29 | 2015-09-02 | 孙永宏 | SNCR denitration device outside grate-fired furnace |
| CN104959011A (en) * | 2015-06-15 | 2015-10-07 | 孙永宏 | External SNCR (selective non-catalytic reduction) denitrification device of grate-fired furnace |
| CN114225682A (en) * | 2021-10-29 | 2022-03-25 | 山西昱光发电有限责任公司 | Low-load denitration method for circulating fluidized bed boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151202 Termination date: 20180529 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |