CN220524108U - Direct-fired boiler system capable of reducing emission of nitrogen oxides - Google Patents
Direct-fired boiler system capable of reducing emission of nitrogen oxides Download PDFInfo
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- CN220524108U CN220524108U CN202320018675.3U CN202320018675U CN220524108U CN 220524108 U CN220524108 U CN 220524108U CN 202320018675 U CN202320018675 U CN 202320018675U CN 220524108 U CN220524108 U CN 220524108U
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- gas
- direct
- reburning
- fired boiler
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 239000007789 gas Substances 0.000 claims abstract description 85
- 239000002028 Biomass Substances 0.000 claims abstract description 19
- 238000002485 combustion reaction Methods 0.000 claims abstract description 12
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 5
- 238000000034 method Methods 0.000 abstract description 8
- 239000002737 fuel gas Substances 0.000 abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 239000000428 dust Substances 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000002309 gasification Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000013067 intermediate product Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Abstract
The utility model discloses a direct-fired boiler system for reducing nitrogen oxide emission, which comprises a direct-fired boiler, wherein a main combustion area is arranged in the direct-fired boiler, and a reburning area and a burnout area are also arranged in the direct-fired boiler; the reburning area of the direct-fired boiler is provided with a plurality of reburning nozzles which are inserted into the side wall of the direct-fired boiler and are communicated with the reburning area, and a reburning gas supply pipeline which is communicated with the reburning nozzles, wherein the reburning gas supply pipeline is provided with a biomass gasifier, a reburning gas fan, a reburning gas low-pressure switch and a gas cut-off valve; the burnout zone of the direct-fired boiler is provided with a plurality of burnout air nozzles which are inserted into the side wall of the direct-fired boiler and communicated with the burnout zone, and a burnout air supply pipeline communicated with the burnout air nozzles. The biomass fuel gas is used as reburning gas to be applied to the reburning process of the direct-fired boiler so as to achieve the purpose of reducing the emission of nitrogen oxides.
Description
Technical Field
The utility model relates to the technical field of combustion, in particular to a direct-fired boiler capable of reducing emission of nitrogen oxides.
Background
The method for post-treatment of the direct-fired boiler flue gas generally comprises the following steps: firstly, flue gas completely combusted in a boiler passes through cooling equipment to perform waste heat recovery; then the mixture passes through a cyclone separator for the purpose of secondary cooling and removal of large particle dust; then filtering and treating the residual dust in the flue gas through a bag-type dust remover to ensure that the discharge of the residual dust reaches the national standard; the flue gas at the moment enters the out-of-stock equipment to carry out NO in the flue gas x And (5) denitration treatment is carried out. The current direct-fired boiler has the emission generally lower than 200mg/m 3 However, the treatment of nitrogen oxides is still dependent on denitration equipment.
Disclosure of Invention
The utility model aims to provide a direct-fired boiler system for reducing nitrogen oxide emission, which uses biomass fuel gas as reburning gas in the reburning process of a direct-fired boiler so as to achieve the aim of reducing nitrogen oxide emission.
The purpose of the utility model is realized in the following way: the direct-fired boiler system for reducing the emission of nitrogen oxides comprises a direct-fired boiler, wherein a main combustion area is arranged in the direct-fired boiler, a reburning area and a burnout area are also arranged in the direct-fired boiler, and the main combustion area, the reburning area and the burnout area are sequentially arranged from bottom to top;
the reburning area of the direct-fired boiler is provided with a plurality of reburning nozzles which are inserted into the side wall of the direct-fired boiler and are communicated with the reburning area, and a reburning gas supply pipeline which is communicated with the reburning nozzles, wherein the reburning gas supply pipeline is provided with a biomass gasifier, a reburning gas fan, a reburning gas low-pressure switch and a gas cut-off valve;
the burnout zone of the direct-fired boiler is provided with a plurality of burnout air nozzles which are inserted into the side wall of the direct-fired boiler and communicated with the burnout zone, and a burnout air supply pipeline communicated with the burnout air nozzles.
The utility model has the beneficial effects that:
the biomass gas is used as reburning gas in the reburning process of the direct-fired boiler so as to achieve the aim of reducing the emission of nitrogen oxides, and meanwhile, the flow and the pressure of the biomass gas are controlled, so that the safety of the conveying process is ensured;
can realize CO 2 The effect of reducing the emission of nitrogen oxides by using the biogas as the reburn gas is not poorer than that of natural gas, and accessory products caused by post-denitration can be reduced.
Drawings
Fig. 1 is a schematic view of a nozzle arrangement of the present utility model.
FIG. 2 is a schematic illustration of the layout of the reformed gas supply line.
FIG. 3 is a schematic illustration of the arrangement of the overfire air supply lines.
Detailed Description
The utility model will be further described with reference to figures 1-3 and the specific examples.
As shown in fig. 1, the direct-fired boiler system for reducing the emission of nitrogen oxides comprises a direct-fired boiler 1, wherein a main combustion zone 2 is arranged in the direct-fired boiler 1, a hearth outlet 5 is arranged on one side of the top of the direct-fired boiler, a reburning zone 3 and a burnout zone 4 are further arranged in the direct-fired boiler 1, and the main combustion zone 2, the reburning zone 3 and the burnout zone 4 are sequentially arranged from bottom to top.
As shown in fig. 1 and 2, the reburning zone 3 of the direct-fired boiler 1 is provided with a plurality of reburning nozzles 6 which are inserted into the side wall of the direct-fired boiler 1 and are communicated with the reburning zone 3, and a reburning gas supply line 17 communicated with the reburning nozzles 6.
The secondary gas supply pipeline 17 is provided with a biomass gasification furnace 8, a secondary gas fan 9, a secondary gas low-pressure switch 12 and gas cut-off valves 13, the biomass gasification furnace 8, the secondary gas fan 9 and the secondary gas low-pressure switch 12 are sequentially arranged, secondary gas conveying power is generated by the secondary gas fan 9, whether the gas pressure of a pipeline is in a normal working range or not is monitored by the secondary gas low-pressure switch 12, the two gas cut-off valves 13 are arranged at the downstream position of the secondary gas low-pressure switch 12, the two gas cut-off valves 13 are in interlocking arrangement, and a leak detection switch 14 for monitoring whether the secondary gas supply pipeline 17 leaks is arranged on a passage between the two gas cut-off valves 13.
In this embodiment, the biomass gasification furnace 8 generates biomass gas, which is input to the reburn gas nozzle 6 through the reburn gas supply line 17 and then to the reburn zone 3; the biomass fuel gas is used as the reburning gas in the reburning process of the biomass direct-fired boiler, and can also be used in the reburning process of other types of direct-fired boilers, so as to achieve the purpose of reducing the emission of nitrogen oxides.
The reburning technology for reducing the emission of nitrogen oxides is to spray reburning gas at a position on the main combustion zone 2, and produce an under-oxygen atmosphere in the main combustion zone 2, and control the excess air coefficient between 0.7 and 0.9 so as to establish a fuel-rich zone to reduce the generated nitrogen oxides. Above the main combustion zone 2 is a reburning zone 3, in which a reburning nozzle 6 is provided and a suitable amount of reburning gas is injected. Above the reburning zone 3 is a burnout zone 4, in which a burnout air is injected and mixed with the gas which does not participate in the reaction and then burnt out.
Natural gas is often the main source of the reformed gas because methane is highly reducing and can reduce most of the nitrogen oxides, but natural gas is disadvantageous in that it is expensive and is not optimal from an environmental point of view as fossil energy. In this embodiment, the following advantages are produced by using the biogas as the reburn gas: firstly, the biomass fuel gas is used as renewable zero-carbon energy, and the price is much lower than that of natural gas; secondly, the components of the biomass gas combustion contain nitrogenous intermediate products, and the nitrogenous intermediate products can react with nitrogen oxides to generate nitrogen, so that the denitration effect is good.
Therefore, biomass fuel gas is adopted as the reburn gas and combined with the biomass direct-fired boiler, so that the irreplaceable position of fossil fuel is completely replaced, and a wider thought is provided for the future targets of carbon peak and carbon neutralization.
In order to monitor the flow rate and pressure of the input biomass gas, the above-mentioned reformed gas supply line 17 is provided with a gas flowmeter 10 and a reformed gas pressure gauge 11, and the gas flowmeter 10 and the reformed gas pressure gauge 11 are sequentially disposed on the passage between the reformed gas fan 9 and the reformed gas low-pressure switch 12.
The reformed gas supply line 17 is provided with a reformed gas pressure gauge two 15 for better monitoring the pressure of the reformed gas, the reformed gas pressure gauge two 15 being located downstream of the downstream gas shutoff valve 13. The reformed gas supply line 17 is provided with a gas flow rate adjustment valve 16 for further adjusting the flow rate of the reformed gas, the gas flow rate adjustment valve 16 being located downstream of the reformed gas pressure gauge 15.
As shown in fig. 1 and 3, the burnout zone 4 of the direct-fired boiler 1 is provided with a plurality of burnout air nozzles 7 which are inserted into the side wall of the direct-fired boiler 1 and are communicated with the burnout zone 4, and a burnout air supply line 18 communicated with the burnout air nozzles 7.
The above-mentioned air supply line 18 is equipped with the air blower 19, the air shut-off valve 21, the air flow regulator 23, the air blower 19, the air shut-off valve 21, the air flow regulator 23 are disposed sequentially, utilize the air blower 19 to produce the transport power of the air, the air supply line 18 is equipped with the air low-voltage switch 20, the air low-voltage switch 20 is located in the passageway between air blower 19 and air shut-off valve 21, the air supply line 18 is equipped with the air flow meter 22, the air pressure gauge 24 of the air flow, in order to monitor the flowrate and pressure of the air, ensure the security of the air transport process, the air flow meter 22 is located in the passageway between air shut-off valve 21 and air flow regulator 23.
The foregoing is a preferred embodiment of the present utility model, and various changes and modifications may be made therein by those skilled in the art without departing from the general inventive concept, and such changes and modifications should be considered as falling within the scope of the present utility model as defined in the appended claims.
Claims (7)
1. The direct-fired boiler system for reducing the emission of nitrogen oxides comprises a direct-fired boiler (1), wherein a main combustion zone (2) is arranged in the direct-fired boiler (1), and the direct-fired boiler system is characterized in that a reburning zone (3) and an burnout zone (4) are also arranged in the direct-fired boiler (1), and the main combustion zone (2), the reburning zone (3) and the burnout zone (4) are sequentially arranged from bottom to top;
the reburning area (3) of the direct-fired boiler (1) is provided with a plurality of reburning nozzles (6) which are inserted into the side wall of the direct-fired boiler (1) and are communicated with the reburning area (3), and a reburning gas supply pipeline (17) communicated with the reburning nozzles (6), the reburning gas supply pipeline (17) is provided with a biomass gasifier (8), a reburning gas fan (9), a reburning gas low-pressure switch (12) and a gas cut-off valve (13), the biomass gasifier (8), the reburning gas fan (9) and the reburning gas low-pressure switch (12) are sequentially arranged, two gas cut-off valves (13) are arranged at the downstream position of the reburning gas low-pressure switch (12), and a leak detection switch (14) for monitoring whether the reburning gas supply pipeline (17) leaks or not is arranged on a passage between the two gas cut-off valves (13);
the burnout zone (4) of the direct-fired boiler (1) is provided with a plurality of burnout air nozzles (7) which are inserted into the side wall of the direct-fired boiler (1) and are communicated with the burnout zone (4), and a burnout air supply pipeline (18) communicated with the burnout air nozzles (7).
2. A direct-fired boiler system for reducing nitrogen oxide emissions according to claim 1, wherein: the over-fire air supply pipeline (18) is provided with an over-fire air blower (19), an over-fire air cut-off valve (21) and an over-fire air flow regulating valve (23), and the over-fire air blower (19), the over-fire air cut-off valve (21) and the over-fire air flow regulating valve (23) are sequentially arranged.
3. A direct-fired boiler system for reducing nitrogen oxide emissions according to claim 2, wherein: the over-fire air supply pipeline (18) is provided with an over-fire air low-voltage switch (20), and the over-fire air low-voltage switch (20) is arranged on a passage between the over-fire air fan (19) and the over-fire air cut-off valve (21).
4. A direct-fired boiler system for reducing nitrogen oxide emissions according to claim 2, wherein: the over-fire air supply pipeline (18) is provided with an over-fire air flowmeter (22) and an over-fire air pressure gauge (24), and the over-fire air flowmeter (22) is arranged on a passage between the over-fire air cut-off valve (21) and the over-fire air flow regulating valve (23).
5. A direct-fired boiler system for reducing nitrogen oxide emissions according to claim 1, wherein: the gas flow meter (10) and the first gas pressure meter (11) are sequentially arranged on a passage between the gas re-burning fan (9) and the gas re-burning low-pressure switch (12).
6. A direct-fired boiler system for reducing nitrogen oxide emissions according to claim 5, wherein: the secondary gas supply pipeline (17) is provided with a secondary gas pressure gauge (15), and the secondary gas pressure gauge (15) is positioned at the downstream position of the downstream gas cut-off valve (13).
7. A direct-fired boiler system for reducing nitrogen oxide emissions according to claim 6, wherein: the reburn gas supply line (17) is provided with a gas flow regulating valve (16), and the gas flow regulating valve (16) is positioned at the downstream position of the reburn gas pressure gauge II (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320018675.3U CN220524108U (en) | 2023-01-05 | 2023-01-05 | Direct-fired boiler system capable of reducing emission of nitrogen oxides |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320018675.3U CN220524108U (en) | 2023-01-05 | 2023-01-05 | Direct-fired boiler system capable of reducing emission of nitrogen oxides |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220524108U true CN220524108U (en) | 2024-02-23 |
Family
ID=89925390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320018675.3U Active CN220524108U (en) | 2023-01-05 | 2023-01-05 | Direct-fired boiler system capable of reducing emission of nitrogen oxides |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220524108U (en) |
-
2023
- 2023-01-05 CN CN202320018675.3U patent/CN220524108U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |