CN114321891A - Novel direct-current burner for coupled combustion of pulverized coal fired boiler of large power station - Google Patents
Novel direct-current burner for coupled combustion of pulverized coal fired boiler of large power station Download PDFInfo
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- CN114321891A CN114321891A CN202210045569.4A CN202210045569A CN114321891A CN 114321891 A CN114321891 A CN 114321891A CN 202210045569 A CN202210045569 A CN 202210045569A CN 114321891 A CN114321891 A CN 114321891A
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Abstract
Novel direct-current burner for coupling combustion of large-scale power station pulverized coal boilers. At present, the biomass and coal powder mixed combustion technology is that an opening is formed in a boiler body, and biomass fuel is sprayed into a hearth to be combusted. So the fuel mixing effect is poor, and the modification cost is relatively high. The invention comprises the following components: one end of the peripheral air channel (1) is a nozzle inside a boiler furnace, the other end of the peripheral air channel is connected with an air box, and a peripheral air reducing opening (2) is arranged on one side of the end face of the nozzle; one end of the biomass channel is a nozzle inside a boiler hearth, the other end of the biomass channel is connected with a biomass feeding pipeline, and a biomass channel necking (5) is arranged on one side of the end face of the nozzle; and one end of the pulverized coal channel (7) is a nozzle inside a boiler hearth, and the other end of the pulverized coal channel is connected with a pulverized coal feeding pipeline. The invention is used for a novel direct-current burner for coupling combustion of a large-scale power station pulverized coal boiler.
Description
Technical Field
The invention relates to a novel direct-current burner for coupled combustion of a large-scale power station pulverized coal boiler, belonging to the technical field of combustion equipment.
Background
The biomass energy is the only renewable energy which can be stored, the biomass is used for generating electricity, the disordered incineration is changed into concentrated combustion while the resources are effectively utilized, a large amount of coal resources can be saved, the income of farmers can be increased, and the optimization significance of the energy structure in China is great.
The mass fractions of potassium and chlorine in the biomass fuel are high, serious slag bonding and corrosion can be caused by direct combustion, and the problem can be solved by co-combustion of the biomass and the pulverized coal. The operation of blending and burning biomass on the existing large-capacity coal-fired unit is much lower than that of a newly-built pure biomass-burning power plant, and simultaneously, the fuel cost of the power plant can be reduced by burning biomass fuel with relatively low price, so that the economic benefit of the power plant is improved; the large-scale mixed combustion of biomass can also promote the development of rural economy around power plants.
At present, the biomass and pulverized coal mixed combustion technology applied to engineering in China is to open an opening on a boiler body and spray biomass fuel into a hearth for combustion. So the fuel mixing effect is poor, and the modification cost is relatively high. Therefore, it is urgently needed to develop a novel combustion device suitable for efficient clean utilization of biomass direct-mixing so as to simplify a system for biomass direct-mixing combustion and efficient clean utilization thereof, and reduce the modification cost.
Disclosure of Invention
The invention aims to provide a novel direct-current burner for coupling combustion of a pulverized coal boiler of a large power station, which has the advantages of layered arrangement of fuels, strong ignition capability, stable combustion, low pollutant discharge and the like, and has wide prospect and space in direct-mixing combustion and utilization of biomass and pulverized coal.
The above purpose is realized by the following technical scheme:
a novel direct-current burner for coupled combustion of a pulverized coal fired boiler of a large power station comprises
One end of the peripheral air channel is a nozzle inside a boiler furnace, the other end of the peripheral air channel is connected with an air box, and a peripheral air necking is arranged on one side of the end face of the nozzle;
one end of the biomass channel is a nozzle inside a boiler furnace, the other end of the biomass channel is connected with a biomass feeding pipeline, and a biomass channel necking is arranged on one side of the end face of the nozzle;
one end of the pulverized coal channel is a nozzle inside a boiler hearth, and the other end of the pulverized coal channel is connected with a pulverized coal feeding pipeline.
The novel direct-current burner for coupling combustion of the large-scale power station pulverized coal boiler is characterized in that a bluff body enabling a backflow area to appear behind a nozzle is arranged in a pulverized coal channel.
The novel direct-current combustor for coupling combustion of the large-scale power station pulverized coal boiler is characterized in that the peripheral air channel is fixed on the outer wall of the biomass channel through a plurality of peripheral air partition plates;
the novel direct-current combustor for coupling combustion of the large-scale power station pulverized coal boiler is characterized in that the biomass channel is divided into N areas through N biomass clapboards.
The novel direct-current combustor for coupling combustion of the large-scale power station pulverized coal boiler is characterized in that the peripheral air channel gradually provides oxygen for fuel and is positioned on the outermost layer of the combustor.
The novel direct-current combustor for coupling combustion of the large-scale power station pulverized coal boiler is characterized in that the biomass channel enables biomass fuel to preferentially contact high-temperature flue gas and is located in the middle layer of the combustor.
The novel direct-current burner for coupling combustion of the large-scale power station pulverized coal boiler is characterized in that the pulverized coal channel is located on the innermost side of the burner.
Has the advantages that:
1. the biomass channel is arranged outside the pulverized coal channel, so that the biomass can be preferentially contacted with high-temperature flue gas. Such an arrangement can improve the ignition and flame holding performance of the burner because the ignition point of biomass is lower than that of pulverized coal (presumably 150 ℃ lower than that of pulverized coal), i.e., biomass is more easily ignited than pulverized coal. Meanwhile, the ignited biomass fuel can further heat the pulverized coal fuel on the inner layer, so that the ignition of the pulverized coal fuel is easier and the combustion is more stable. Therefore, the ignition performance and the stable combustion performance of the burner are better.
2. The blunt body is arranged in the pulverized coal channel, the flow field can form a stable backflow area on the rear surface of the flow field, the backflow area sucks high-temperature flue gas to heat pulverized coal, and the ignition stability of the pulverized coal is improved; meanwhile, the oxygen content of the high-temperature flue gas sucked in the backflow area is not high, so that the pulverized coal is in an anoxic combustion state, and the promotion effect of reducing the original emission of NOx is achieved.
3. The circumferential air channel and the biomass channel are provided with the necking at the side of the nozzle, and the necking can improve the flow velocity of airflow entering the hearth, increase the rigidity of the airflow and enable the combustion to be easier to be carried out under the preset condition.
4. The invention can be connected with the solid fuel conveying pipeline in a flange connection or welding mode, can be in straight pipe connection or elbow connection, has wide application range and compact structure, and is convenient for installation, disassembly and operation maintenance of the combustor.
Description of the drawings:
FIG. 1 is a front view of the present invention;
FIG. 2 is a side view of the present invention;
FIG. 3 is a view taken along line A of FIG. 1;
FIG. 4 is a schematic structural diagram of a biomass straight pipe and a coal dust straight pipe;
FIG. 5 is a schematic structural diagram of a biomass straight pipe and a pulverized coal elbow;
FIG. 6 is a schematic structural view of a biomass elbow and a coal dust straight pipe;
FIG. 7 is a schematic structural diagram of a biomass straight pipe and a coal dust straight pipe;
in the figure: 1. a perimeter wind channel; 2. a peripheral wind necking; 3. a perimeter air baffle; 4. a biomass channel; 5. necking a biomass channel; 6. a biomass spacer; 7. a pulverized coal passage; 8. a blunt body.
The specific implementation mode is as follows:
example 1:
a novel direct-current burner for coupled combustion of a pulverized coal fired boiler of a large power station comprises
One end of the peripheral air channel is a nozzle inside a boiler furnace, the other end of the peripheral air channel is connected with an air box, and a peripheral air reducing port 2 is arranged on one side of the end face of the nozzle;
one end of the biomass channel is a nozzle inside a boiler furnace, the other end of the biomass channel is connected with a biomass feeding pipeline, and a biomass channel necking 5 is arranged on one side of the end face of the nozzle;
and one end of the pulverized coal channel is a nozzle inside the boiler hearth, and the other end of the pulverized coal channel is connected with a pulverized coal feeding pipeline.
Example 2:
according to embodiment 1 novel direct current burner of large-scale power station pulverized coal boiler coupling burning, the inside blunt body 8 that makes the backward flow district appear in the spout rear that sets up of buggy passageway, the backward flow district can appear in this structure can make the spout rear, the backward flow district can the entrainment the high temperature flue gas in the place ahead, stabilize the pulverized coal burning, reduce main combustion area combustion temperature simultaneously, reduce the original emission level of NOx.
Example 3:
according to the novel direct-current burner for coupling combustion of the large-scale pulverized coal boiler of the power station in the embodiment 1 or 2, the peripheral air channel is fixed on the outer wall of the biomass channel through the plurality of peripheral air partition plates 3.
Example 4:
according to the novel direct-current burner for coupling combustion of the large-scale pulverized coal fired power plant boiler in the embodiment 1, 2 or 3, the biomass channel is divided into N areas through N biomass clapboards 6.
Example (b):
according to the novel direct-current burner for coupling combustion of the large-scale pulverized coal fired power plant boiler in the embodiment 1, 2, 3 or 4, the peripheral air channel gradually provides oxygen for fuel, and the peripheral air channel is located at the outermost layer of the burner, so that the temperature of a main combustion area is reduced, and the direct-current burner is very favorable for reducing the original emission of NOx.
Example 6:
according to the novel direct-current burner for coupling combustion of the large-scale pulverized coal fired boiler of the power station in the embodiment 1, 2, 3, 4 or 5, the biomass channel enables biomass fuel to preferentially contact high-temperature flue gas and is located in the middle layer of the burner, and due to the fact that the ignition point of the biomass is low, the burning biomass fuel can further heat the pulverized coal fuel, and therefore the ignition performance and the stable combustion performance of the burner are better.
Example 7:
the novel direct-flow burner for coupling combustion of the large-scale pulverized coal boiler of the power station according to the embodiment 1, 2, 3, 4, 5 or 6 is characterized in that the pulverized coal channel is positioned at the innermost side of the burner.
Example 8:
when the biomass straight pipe and the coal powder straight pipe are used, as shown in figure 4, the biomass fuel and the coal powder fuel are both led into the combustor through the straight pipes, and then the two fuels are sent into the hearth through the biomass channel 4 and the coal powder channel 7 in the combustor.
Example 9:
when the biomass straight pipe and the pulverized coal elbow are connected as shown in figure 5, the biomass fuel is fed into the combustor from the straight pipe, the pulverized coal fuel is fed into the combustor from the elbow, and the two fuels are fed into the hearth through the biomass channel 4 and the pulverized coal channel 7 in the combustor.
Example 10:
when the biomass elbow and the coal dust straight pipe are used, as shown in figure 6, biomass fuel is sent into the combustor through the elbow pipe, coal dust airflow is sent into the combustor through the elbow pipe, and the two fuels are sent into a hearth through a biomass channel 4 and a coal dust channel 7 in the combustor.
Example 11:
when the biomass straight pipe and the coal dust straight pipe are used, as shown in figure 7, both the biomass fuel and the coal dust fuel are sent into the combustor through elbows, and the two fuels are sent into a hearth through the biomass channel 4 and the coal dust channel 7 in the combustor.
Claims (7)
1. The utility model provides a novel direct current combustor of large-scale power station pulverized coal fired boiler coupling burning, characterized by: which comprises the following components
One end of the peripheral air channel is a nozzle inside a boiler furnace, the other end of the peripheral air channel is connected with an air box, and a peripheral air necking is arranged on one side of the end face of the nozzle;
one end of the biomass channel is a nozzle inside a boiler furnace, the other end of the biomass channel is connected with a biomass feeding pipeline, and a biomass channel necking is arranged on one side of the end face of the nozzle;
one end of the pulverized coal channel is a nozzle inside a boiler hearth, and the other end of the pulverized coal channel is connected with a pulverized coal feeding pipeline.
2. The novel direct-current burner for coupled combustion of the large-scale pulverized coal fired power plant boiler according to claim 1, which is characterized in that: the pulverized coal channel is internally provided with a blunt body which enables a backflow area to appear behind the nozzle.
3. The novel direct-current burner for coupled combustion of the large-scale pulverized coal fired power plant boiler according to claim 1, which is characterized in that: the peripheral air channel is fixed on the outer wall of the biomass channel through a plurality of peripheral air baffles.
4. The novel direct-current burner for coupled combustion of the large-scale pulverized coal fired power plant boiler according to claim 1, which is characterized in that: the biomass channel is divided into N areas by N biomass clapboards.
5. The novel direct-current burner for coupled combustion of the large-scale pulverized coal fired power plant boiler as claimed in claim 1 or 3, which is characterized in that: the peripheral air channel gradually provides oxygen for fuel and is positioned at the outermost layer of the combustor.
6. The novel direct-current burner for coupled combustion of the large-scale pulverized coal fired power plant boiler as claimed in claim 1 or 4, which is characterized in that: the biomass channel enables biomass fuel to preferentially contact high-temperature flue gas and is positioned in the middle layer of the combustor.
7. The novel direct-current burner for coupled combustion of the large-scale pulverized coal fired power plant boiler as claimed in claim 1 or 2, which is characterized in that: the pulverized coal channel is positioned at the innermost side of the burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210045569.4A CN114321891A (en) | 2022-01-15 | 2022-01-15 | Novel direct-current burner for coupled combustion of pulverized coal fired boiler of large power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210045569.4A CN114321891A (en) | 2022-01-15 | 2022-01-15 | Novel direct-current burner for coupled combustion of pulverized coal fired boiler of large power station |
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| Publication Number | Publication Date |
|---|---|
| CN114321891A true CN114321891A (en) | 2022-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210045569.4A Pending CN114321891A (en) | 2022-01-15 | 2022-01-15 | Novel direct-current burner for coupled combustion of pulverized coal fired boiler of large power station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114321891A (en) |
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2022
- 2022-01-15 CN CN202210045569.4A patent/CN114321891A/en active Pending
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