CN204841402U - Outer SNCR denitrification facility of layer furnace stove - Google Patents
Outer SNCR denitrification facility of layer furnace stove Download PDFInfo
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- CN204841402U CN204841402U CN201520410875.9U CN201520410875U CN204841402U CN 204841402 U CN204841402 U CN 204841402U CN 201520410875 U CN201520410875 U CN 201520410875U CN 204841402 U CN204841402 U CN 204841402U
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- flue
- district
- heat transfer
- burner hearth
- reaction
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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 convection bank district along flue gas advancing direction, combustion chamber outer wall is connected with and is used for carrying on the out of stock reaction flue of SNCR, the flue gas in radiation heat transfer district via the reaction flue flow direction the convection bank district. The utility model discloses simple structure, convenient operation can guide to the boiler outside with the flue gas of furnace exit department, gets back to in the boiler accomplish out of stock reaction outside the stove after again to provide sufficient reaction space for SNCR denitration technology, and then 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 convection bank district along flue gas direct of travel, described hearth outer wall is connected with for carrying out the out of stock reaction flue of SNCR, the flue gas in described radiation heat transfer district via described reaction flue stream to described convection bank district.
Preferably, the exhanst gas outlet of described reaction flue and gas approach place are respectively the first convection heating surface and the second convection heating surface, and described first convection heating surface is radiation heat transfer district, and described second convection heating surface is convection bank district.
Preferably, described thermoregulation mechanism is adjustable shielding radiation dividing plate or fixedly blocks radiation dividing plate.
Preferably, on two sides that described exhanst gas outlet and gas approach are separately positioned on described burner hearth or upper surface, the flue gas in described radiation heat transfer district is flowed out by exhanst gas outlet, flows to described convection bank district via described reaction flue and gas approach.
Preferably, on the side that described exhanst gas outlet and gas approach are separately positioned on described burner hearth or upper surface, the flue gas in described radiation heat transfer district is flowed out by exhanst gas outlet, flows to described convection bank district via described reaction flue and gas approach.
Preferably, the number of described reaction flue is multiple, and correspondence is arranged on described burner hearth outside respectively.
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, 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, the flue gas at furnace outlet place is guided to outside boiler, return complete out of stock reaction outside stove after in boiler, thus provide enough reaction compartments to SNCR denitration technique, successfully meet the optimum response space requirement of SNCR denitration technique.
Accompanying drawing explanation
Fig. 1 is the side view of the outer SNCR denitration device of a kind of grate furnace stove in the utility model embodiment one;
Fig. 2 is the top view shown in Fig. 1;
Fig. 3 is the top view of the outer SNCR denitration device of a kind of grate furnace stove in the utility model embodiment two;
In figure: 1, burner hearth; 2, thermoregulation mechanism; 3, radiation heat transfer district; 4, opening; 5, convection bank district; 6, flue is reacted; 61, exhanst gas outlet; 62, gas approach; 7, smoke-fire-tube; 10, fire grate; 11, exhaust gases passes; 12, rear 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 Figure 1, the outer SNCR denitration device of a kind of grate furnace stove that the utility model embodiment one provides, comprise: burner hearth 1, thermoregulation mechanism 2, radiation heat transfer district 3 and convection bank district 5 is provided with along flue gas direct of travel on burner hearth 1 top, described hearth outer wall is connected with for carrying out the out of stock reaction flue 6 of SNCR, and the flue gas in described radiation heat transfer district 3 flows to described convection bank district 5 via described reaction flue 6.In the present embodiment, exhanst gas outlet 61 and gas approach 62 place of reaction flue 6 are respectively the first convection heating surface and the second convection heating surface, first convection heating surface is radiation heat transfer district 3, second convection heating surface is convection bank district 5, namely, in the utility model embodiment, the flue gas in radiation heat transfer district 3 flows to convection bank district 5 by the reaction flue 6 being arranged on burner hearth 1 outside.
In the present embodiment, 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 in radiation heat transfer district 3 is guided to outside burner hearth 1 by reaction flue 6 by the utility model embodiment, return complete out of stock reaction outside burner hearth 1 after in burner hearth 1, thus outside stove, complete SNCR denitration technique, save space.
As shown in Figure 2, the number of the reaction flue 6 in the present embodiment is 2, correspondence is arranged on described burner hearth outside respectively, exhanst gas outlet 61 and gas approach 62 are separately positioned on two sides of described burner hearth 1, the flue gas in described radiation heat transfer district 3 is flowed out by exhanst gas outlet 61, described convection bank district 5 is flowed to, as shown in the direction of arrow in Fig. 2 via described reaction flue 6 and gas approach 62.
Be understandable that, the utility model does not limit the number of reaction flue 6, can according to need of production sets itself.As shown in Figure 3, the outer SNCR denitration device of a kind of grate furnace stove that the utility model embodiment two provides, wherein, described exhanst gas outlet 61 and gas approach 62 are separately positioned on a side of described burner hearth, the flue gas in described radiation heat transfer district 3 is flowed out by exhanst gas outlet 61, described convection bank district 5 is flowed to, as shown in the direction of arrow in Fig. 3 via described reaction flue 6 and gas approach 62.
It should be noted that exhanst gas outlet 61 of the present utility model and gas approach 62 can be arranged on side or the upper surface of burner hearth; The utility model does not limit the connected mode of the reaction flue 6 of exhanst gas outlet 61 and gas approach 62 quantity and connection, can according to need of production sets itself.
Further, in the utility model embodiment, after in burner hearth 1, water-cooling wall 12 lower end part is provided with the combustion-supporting arch 13 of partition-type, 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, and 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 2, radiation heat transfer district 3 and opening 4 is provided with along flue gas direct of travel on burner hearth 1 top, radiation heat transfer district 3 is communicated with convection bank district 5 by opening 4, convection bank 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, an exhaust gases passes is defined, as shown in the direction of arrow in Fig. 1 between radiation heat transfer district 3 and convection bank district 5.
Further, thermoregulation mechanism 2 is for adjustable shielding radiation dividing plate or fixedly block radiation dividing plate, or utilize other technologies means to reduce heat transfer intensity to improve the structure of the outlet temperature of radiation area, adjustable shielding radiation dividing plate is made up of resistant to elevated temperatures material, the opening and closing of adjustable shielding radiation dividing plate 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 is provided with connecting rod, connecting rod is linked together by one end of bearing pin and adjustable shielding radiation dividing plate, 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 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 opening 4 place be about 950 DEG C, successfully meet the optimal reaction temperature requirement of SNCR denitration technique.
Further, opening 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 opening 4 place can be observed by display unit, when temperature is higher than 950 °, adjustable shielding radiation dividing plate 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 with the second direction contrary with first direction, make it close, increase its radiation heat transfer area, to improve the temperature levels at opening 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 opening 4 of burner hearth, the temperature at opening 4 place is more than 900 DEG C, but due to the normal underrun of grate firing boiler, therefore the temperature at actual flue gas opening 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 in radiation heat transfer district 3, described adjustable shielding radiation dividing plate 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 another embodiment, thermoregulation mechanism 2 can for fixedly to block radiation dividing plate, fixedly block radiation dividing plate to be made up of resistant to elevated temperatures material, be provided with connecting rod, connecting rod is linked together by bearing pin and the one end of fixedly blocking radiation dividing plate, the other end of connecting rod stretches out outside body of heater through furnace wall, fixedly blocks radiation dividing plate for the fixing heat exchange area in burner hearth is adjusted to predetermined heat exchange area.
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.
Particularly, in the utility model embodiment, adjustable shielding radiation dividing plate 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 transfer flue the path of process become straight tube path, heavy in section, its beneficial effect is, when specified cigarette speed, enters into after in heat transfer flue, cigarette speed declines, the flue-gas temperature range of decrease is little, and when being unlikely to make flue gas arrive opening 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 transfer flue, 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, be provided with in radiation heat transfer district and block radiation dividing plate, 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 (8)
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 convection bank district along flue gas direct of travel, described hearth outer wall is connected with for carrying out the out of stock reaction flue of SNCR, the flue gas in described radiation heat transfer district via described reaction flue stream to described convection bank district.
2. device as claimed in claim 1, it is characterized in that, the exhanst gas outlet of described reaction flue and gas approach place are respectively the first convection heating surface and the second convection heating surface, and described first convection heating surface is radiation heat transfer district, and described second convection heating surface is convection bank district.
3. device as claimed in claim 1, it is characterized in that, described thermoregulation mechanism is adjustable shielding radiation dividing plate or fixedly blocks radiation dividing plate.
4. device as claimed in claim 2, it is characterized in that, on two sides that described exhanst gas outlet and gas approach are separately positioned on described burner hearth or upper surface, the flue gas in described radiation heat transfer district is flowed out by exhanst gas outlet, flows to described convection bank district via described reaction flue and gas approach.
5. device as claimed in claim 2, it is characterized in that, on the side that described exhanst gas outlet and gas approach are separately positioned on described burner hearth or upper surface, the flue gas in described radiation heat transfer district is flowed out by exhanst gas outlet, flows to described convection bank district via described reaction flue and gas approach.
6. device as claimed in claim 1, it is characterized in that, the number of described reaction flue is multiple, and correspondence is arranged on described burner hearth outside respectively.
7. 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.
8. device as claimed in claim 7, it is characterized in that, described shutter is the temperature-resistant materials such as ordinary carbon steel, heat-and corrosion-resistant steel alloy or pottery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520410875.9U CN204841402U (en) | 2015-06-15 | 2015-06-15 | Outer SNCR denitrification facility of layer furnace stove |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520410875.9U CN204841402U (en) | 2015-06-15 | 2015-06-15 | Outer SNCR denitrification facility of layer furnace stove |
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| CN204841402U true CN204841402U (en) | 2015-12-09 |
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| CN201520410875.9U Expired - Fee Related CN204841402U (en) | 2015-06-15 | 2015-06-15 | Outer SNCR denitrification facility of layer furnace stove |
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Cited By (1)
| 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 |
-
2015
- 2015-06-15 CN CN201520410875.9U patent/CN204841402U/en not_active Expired - Fee Related
Cited By (1)
| 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 |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151209 Termination date: 20170615 |