CN104874280A - SNCR denitration device outside grate-fired furnace - Google Patents
SNCR denitration device outside grate-fired furnace Download PDFInfo
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- CN104874280A CN104874280A CN201510290475.3A CN201510290475A CN104874280A CN 104874280 A CN104874280 A CN 104874280A CN 201510290475 A CN201510290475 A CN 201510290475A CN 104874280 A CN104874280 A CN 104874280A
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- dividing plate
- temperature
- convection
- adjustable shielding
- radiation
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- 230000005855 radiation Effects 0.000 claims abstract description 49
- 230000007246 mechanism Effects 0.000 claims abstract description 9
- 239000000779 smoke Substances 0.000 claims abstract description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 24
- 239000003546 flue gas Substances 0.000 claims description 24
- 239000007789 gas Substances 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 15
- 230000028016 temperature homeostasis Effects 0.000 claims description 6
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 21
- 230000008569 process Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000010304 firing Methods 0.000 description 8
- 235000019504 cigarettes Nutrition 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Solid-Fuel Combustion (AREA)
Abstract
The invention provides an SNCR denitration device outside a grate-fired furnace. The SNCR denitration device comprises a hearth, wherein a temperature adjusting mechanism, a radiation heat exchanging area and a smoke passage are disposed on the upper portion of the hearth and along the moving direction of smoke, the smoke passage is connected with a convection bank area, the convection bank area is connected with a tail flue, an economizer and a heat exchanger are sequentially arranged in the tail flue and along the moving direction of the smoke, the temperature adjusting mechanism is an adjustable radiation-blocking baffle, and the temperature adjusting mechanism can change the fixed heat exchanging area in the hearth into adjustable heat exchanging area. The SNCR denitration device has the advantages that the device is simple in structure and convenient to operate, the fixed heat exchanging area in the hearth can be changed into the adjustable heat exchanging area, the smoke temperature at the outlet of the hearth is allowed to satisfy the optical temperature requirement of an SNCR denitration process, and denitration efficiency is increased.
Description
Technical field
Patent of the present invention 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 (selective non-catalytic reduction, 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.
Summary of the invention
The present invention is directed to the problems referred to above weak point, provide a kind of grate furnace stove outer SNCR denitration device, solve its problem that out of stock efficiency is low, equipment is complicated and cost is high of denitrification apparatus of the prior art.
Technical scheme of the present invention 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 all trades window, 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 present invention, 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 all trades window, 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 present invention;
Fig. 2 is the schematic diagram of the outer SNCR denitration device of a kind of grate furnace stove in the present invention;
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 embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Unless otherwise defined, technical term used herein or scientific terminology should be in field belonging to the present invention the ordinary meaning that the personage with general technical ability understands." first ", " second " that use in patent application specification of the present invention 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 embodiment of the present invention 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 present invention 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 all trades window, by regulating all trades 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 embodiment of the present invention 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 embodiment of the present invention, returns in burner hearth 1 outside burner hearth 1 after completing out of stock reaction.
In the embodiment of the present invention, 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 all trades window, 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 embodiment of the present invention 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.
Invention increases the flue gas flow between inlet flue duct and exhaust pass, 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 invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
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 all trades window, 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 |
|---|---|---|---|
| CN201510290475.3A CN104874280B (en) | 2015-05-29 | 2015-05-29 | A kind of outer SNCR denitration device of grate furnace stove |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510290475.3A CN104874280B (en) | 2015-05-29 | 2015-05-29 | A kind of outer SNCR denitration device of grate furnace stove |
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| Publication Number | Publication Date |
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| CN104874280A true CN104874280A (en) | 2015-09-02 |
| CN104874280B CN104874280B (en) | 2017-03-15 |
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| CN201510290475.3A Expired - Fee Related CN104874280B (en) | 2015-05-29 | 2015-05-29 | A kind of outer SNCR denitration device of grate furnace stove |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104959011A (en) * | 2015-06-15 | 2015-10-07 | 孙永宏 | External SNCR (selective non-catalytic reduction) denitrification device of grate-fired furnace |
| CN107702083A (en) * | 2017-10-12 | 2018-02-16 | 黑龙江聚拢华玺智能科技有限公司 | A kind of Intelligent adjustment boiler |
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| JPH1151363A (en) * | 1997-08-04 | 1999-02-26 | Hitachi Zosen Corp | Burner type ash melting furnace using fluff fuel |
| JPH11325448A (en) * | 1998-05-11 | 1999-11-26 | Takuma Co Ltd | Mold conveyor and its operation method |
| CN201807304U (en) * | 2010-05-21 | 2011-04-27 | 中国神华能源股份有限公司 | Flue gas denitration equipment |
| CN104266217A (en) * | 2014-10-09 | 2015-01-07 | 西安交通大学 | Grate-fired furnace multipath denitration system and denitration method thereof |
| CN104514032A (en) * | 2014-12-18 | 2015-04-15 | 华中科技大学 | Thermal field coordination control Czochralski crystal growth furnace |
| CN104654265A (en) * | 2015-02-12 | 2015-05-27 | 广州迪森热能设备有限公司 | Ultralow-emission nitrogen oxide biomass chain boiler |
| CN204816208U (en) * | 2015-05-29 | 2015-12-02 | 孙永宏 | Outer SNCR denitrification facility of layer furnace stove |
-
2015
- 2015-05-29 CN CN201510290475.3A patent/CN104874280B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1151363A (en) * | 1997-08-04 | 1999-02-26 | Hitachi Zosen Corp | Burner type ash melting furnace using fluff fuel |
| JPH11325448A (en) * | 1998-05-11 | 1999-11-26 | Takuma Co Ltd | Mold conveyor and its operation method |
| CN201807304U (en) * | 2010-05-21 | 2011-04-27 | 中国神华能源股份有限公司 | Flue gas denitration equipment |
| CN104266217A (en) * | 2014-10-09 | 2015-01-07 | 西安交通大学 | Grate-fired furnace multipath denitration system and denitration method thereof |
| CN104514032A (en) * | 2014-12-18 | 2015-04-15 | 华中科技大学 | Thermal field coordination control Czochralski crystal growth furnace |
| CN104654265A (en) * | 2015-02-12 | 2015-05-27 | 广州迪森热能设备有限公司 | Ultralow-emission nitrogen oxide biomass chain boiler |
| CN204816208U (en) * | 2015-05-29 | 2015-12-02 | 孙永宏 | Outer SNCR denitrification facility of layer furnace stove |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104959011A (en) * | 2015-06-15 | 2015-10-07 | 孙永宏 | External SNCR (selective non-catalytic reduction) denitrification device of grate-fired furnace |
| CN107702083A (en) * | 2017-10-12 | 2018-02-16 | 黑龙江聚拢华玺智能科技有限公司 | A kind of Intelligent adjustment boiler |
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| Publication number | Publication date |
|---|---|
| CN104874280B (en) | 2017-03-15 |
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Granted publication date: 20170315 |