CN218763501U - NH 3-mixed mild combustion device in boiler - Google Patents
NH 3-mixed mild combustion device in boiler Download PDFInfo
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- CN218763501U CN218763501U CN202220912613.2U CN202220912613U CN218763501U CN 218763501 U CN218763501 U CN 218763501U CN 202220912613 U CN202220912613 U CN 202220912613U CN 218763501 U CN218763501 U CN 218763501U
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Abstract
The utility model discloses a mix NH 3's gentle burner in boiler, including NH 3 The system comprises an air source, a blanking machine, a feeding machine, a ball mill, a boiler, a burner, a smoke extraction port, a smoke ejector, an air preheater, a first fan and a second fan; NH 3 The air supply links to each other with the combustor, and the combustor links to each other with the boiler, and the blanking machine links to each other with the batcher, and the batcher links to each other with the ball mill, and first fanAnd the second fan is connected with an air preheater, the air preheater is connected with a burner, and a flue gas extraction port is arranged on the boiler. The utility model discloses can realize NH 3 Substitute part of boiler fuel and reduce CO 2 The purpose of discharging. NH by high-temperature recirculated flue gas and high-speed air jet 3 Realizes mild combustion in the boiler and reduces NH 3 NO in combustion process x And (5) discharging.
Description
Technical Field
The utility model relates to a combustion boiler technical field especially relates to a mixing NH in boiler 3 A mild combustion device.
Background
To realize the CO of China 2 Emission reaches a peak before 2030, the goal of '3060' of carbon neutralization is achieved before 2060, and the 'zero-carbon' fuel is urgently required to be searched to replace the traditional fossil fuel so as to reduce CO 2 Discharge and slow down greenhouse effect. Ammonia is considered a promising clean energy carrier and storage medium, which can be obtained from fossil fuels, biomass or other renewable resources, has low cost per unit of stored energy, high hydrogen storage capacity, is easy to liquefy and store, and is a clean renewable alternative fuel. The aim of energy conservation and emission reduction can be achieved by mixing and burning ammonia and carbon-containing fuel, and the problem that the ammonia is low in independent combustion speed and efficient is solvedThe rate is low. However, the presence of large amounts of fuel nitrogen in ammonia can result in NO X The amount of emissions increases.
MILD(Moderate&Intense Low Oxygen Dilution) combustion, also known as flameless combustion or mild combustion, as a mode of combustion under Low Oxygen Dilution conditions, can simultaneously increase fuel combustion efficiency and reduce NO during fuel combustion X Is discharged. The application of the technology in the boiler can greatly reduce NO X And (4) generating.
Chinese patent with application number 202110803117.3 discloses a coal-fired power plant boiler blended NH 3 Method and device for reducing carbon emission intensity by combustion by mixing NH with coal 3 Burning, reducing the consumption of coal and carbon emission, but not reducing NO X The amount of discharge of (c). The Chinese patent with the application number of 201910193619.1 discloses a pulverized coal coupled combustion device and a combustion method, which provide a heat source with uniform temperature for pulverized coal combustion through gas MILD combustion, so that pulverized coal can spontaneously maintain MILD combustion, and NO is reduced to a great extent X But does not reduce the carbon emissions.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a be used for mixing NH in boiler 3 A mild combustion device.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
NH mixing device used in boiler 3 For example, in a coal-fired boiler, the boiler is NH 3 Pulverized coal mild combustion boiler and burner matched hearth structure NH 3 Pulverized coal is combusted mildly, and the boiler is provided with a high-temperature flue gas extraction opening.
The device further comprises NH 3 The device comprises an air source, a blanking machine, a feeding machine, a ball mill, a boiler, a burner, a smoke extraction port, a smoke ejector, an air preheater, a first fan and a second fan. NH (NH) 3 The air supply links to each other with the combustor, and the combustor links to each other with the boiler, and the blanking machine links to each other with the batcher, and the batcher links to each other with the ball mill, and first fan links to each other with the flue gas ejector, and the flue gas ejector links to each other with the ball mill, and the secondThe two fans are connected with an air preheater, and the air preheater is connected with a burner. The working mode of the device is that a high-temperature smoke extraction port is arranged on the boiler, high-temperature smoke in the boiler is extracted to be mixed with air to be used as carrier gas to carry boiler fuel to form primary air to enter the combustor, and air sent by the second fan is preheated by the air preheater to be used as secondary air and NH 3 Directly introducing the mixture into a combustor, sucking high-temperature flue gas in the furnace by utilizing the speed difference between primary air and secondary air and fuel, preheating the fuel and diluting the concentration of an oxidant, thereby forming mild combustion in a hearth.
Compared with the prior art, the utility model discloses there is following advantage:
1. the utility model can be used in boilers with different fuel types, such as coal-fired boilers, biomass boilers, garbage incinerators and the like, and NH is used 3 Replace part of boiler fuel and effectively reduce CO 2 Discharging and slowing down greenhouse effect;
2. the fuel is preheated by high-temperature flue gas in the boiler, and the oxidant is diluted by the high-temperature flue gas in the entrainment boiler by utilizing the speed difference between secondary air and the fuel, so that the ambient oxygen concentration is reduced, and the temperature is higher than the self-ignition point of the fuel, thereby realizing NH in the boiler 3 The mild combustion of the furnace makes the temperature in the furnace distributed evenly, the combustion is more stable, the heat utilization efficiency is improved, NO X The emission is reduced.
Drawings
FIG. 1 shows blending of NH in a boiler 3 Schematic of a mild combustion device.
Wherein: 1 is NH 3 The system comprises an air source, a blanking machine 2, a feeder 3, a ball mill 4, a boiler 5, a burner 6, a high-temperature flue gas extraction port 7, a flue gas ejector 8, an air preheater 9, a first fan 10 and a second fan 11.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
as shown in attached figure 1, NH is mixed in a boiler 3 The MILD combustion apparatus according to (1),
this boiler is the buggy stove, includes: 1-NH 3 Air supply, 2-drop, 3-feeder4-a coal mill, 5-a pulverized coal furnace, 6-a combustor, 7-a high-temperature flue gas extraction port, 8-a flue gas ejector, 9-an air preheater, 10-a first fan and 11-a second fan; wherein NH 3 Air supply 1 is connected with combustor 6, and coal breaker 2 is connected with coal feeder 3, and coal feeder 3 is connected with coal pulverizer 4, and coal pulverizer 4 is connected with combustor 6, and first fan 10 is connected with flue gas ejector 8, and flue gas ejector 8 is connected with combustor 6 with coal pulverizer 4 jointly, and second fan 11 is connected with air heater 9, and the overgrate air export is connected with combustor 6. The first fan 10 boosts the pressure of the air and sends the air into the flue gas ejector 8, so that high-temperature flue gas of the boiler is ejected and sent into the combustor 6.
The pulverized coal furnace is provided with a high-temperature flue gas extraction port 7, the high-temperature flue gas is extracted from the high-temperature flue gas extraction port 7, is sent into the air through a flue gas ejector 8 and a first fan 10 to be mixed, and is used as primary air after carrying pulverized coal, wherein the temperature of the primary air is 200-300 ℃, and the jet speed of a nozzle of the primary air is 20-30 m/s; the air sent by the second fan 11 passes through the air preheater 9 and then is used as secondary air, the temperature of the secondary air is 300-400 ℃, and the jet velocity of a nozzle of the secondary air is 50-100 m/s. The high-temperature flue gas in the pulverized coal furnace is preheated by the high-temperature flue gas, the oxidant and the speed difference between secondary air and the fuel are diluted, the high-temperature flue gas in the pulverized coal furnace is sucked, the ambient oxygen concentration is reduced to the combustible limit, the average temperature of a mixing zone is higher than the ignition temperature of the fuel, and therefore NH in the pulverized coal furnace is achieved 3 Mild combustion.
The pulverized coal furnace 5 can be replaced by boilers of other different fuel types, such as biomass boilers, garbage incinerators and the like.
Blending NH in boiler 3 Burning with NH 3 Replace part of boiler fuel combustion and reduce CO 2 Emission is carried out so as to relieve greenhouse effect; the mild combustion can improve the fuel utilization efficiency and reduce NO x And (5) discharging.
The above embodiments are only used to illustrate the present invention, and not to limit the present invention, and all changes and modifications to the above embodiments will fall within the scope of the claims of the present invention as long as they are within the spirit of the present invention.
Claims (3)
1. A mild combustion device for mixing NH3 in a boiler is characterized by comprising NH 3 The device comprises a gas source (1), a blanking machine (2), a feeding machine (3), a ball mill (4), a boiler (5), a burner (6), a smoke extraction port (7), a smoke ejector (8), an air preheater (9), a first fan (10) and a second fan (11); NH (NH) 3 Air supply (1) links to each other with combustor (6), combustor (6) link to each other with boiler (5), blanking machine (2) link to each other with batcher (3), batcher (3) link to each other with ball mill (4), first fan (10) link to each other with flue gas ejector (8), flue gas ejector (8) link to each other with ball mill (4), second fan (11) link to each other with air heater (9), air heater (9) link to each other with combustor (6), set up flue gas extraction mouth (7) on boiler (5).
2. The mild combustion device for blending NH3 in a boiler as claimed in claim 1, wherein the boiler is a coal-fired boiler, a biomass boiler or a garbage incinerator.
3. The mild combustion device for mixing NH3 in the boiler as claimed in claim 1, wherein the first fan (10) boosts the pressure of the air and sends the air to the flue gas ejector (8), so as to eject the high-temperature flue gas of the boiler and send the high-temperature flue gas to the combustor (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220912613.2U CN218763501U (en) | 2022-04-19 | 2022-04-19 | NH 3-mixed mild combustion device in boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220912613.2U CN218763501U (en) | 2022-04-19 | 2022-04-19 | NH 3-mixed mild combustion device in boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218763501U true CN218763501U (en) | 2023-03-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220912613.2U Active CN218763501U (en) | 2022-04-19 | 2022-04-19 | NH 3-mixed mild combustion device in boiler |
Country Status (1)
| Country | Link |
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| CN (1) | CN218763501U (en) |
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2022
- 2022-04-19 CN CN202220912613.2U patent/CN218763501U/en active Active
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