CN211260782U - Ear cap type high-temperature-resistant premixing combustion nozzle - Google Patents
Ear cap type high-temperature-resistant premixing combustion nozzle Download PDFInfo
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- CN211260782U CN211260782U CN202020000562.7U CN202020000562U CN211260782U CN 211260782 U CN211260782 U CN 211260782U CN 202020000562 U CN202020000562 U CN 202020000562U CN 211260782 U CN211260782 U CN 211260782U
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Abstract
The utility model discloses an anti high temperature of ear cap formula mixes burning nozzle in advance, include: a first housing; the guide plates are uniformly distributed along the outer surface of one end of the first shell; the first channel is coaxially arranged in the first shell, one end of the first channel is of a cylindrical structure, and the other end of the first channel is of a circular truncated cone-shaped structure with the radius gradually reduced; the second shell is coaxially sleeved outside the first shell; a second channel disposed coaxially between the first housing and the second housing; the water inlet mechanism is sleeved outside the second shell; the water outlet mechanism is arranged between the water inlet mechanism and the second shell and communicated with the water inlet mechanism; through first passageway and second passageway cooperation, make the entering fuel premix to lower the temperature to the nozzle through water inlet mechanism, prevent that the nozzle from warping, heat the fuel wind in the second passageway through water outlet mechanism, improve boiler combustion efficiency.
Description
Technical Field
The utility model relates to an anti high temperature of ear cap formula mixes burning nozzle in advance belongs to boiler combustor field.
Background
At present, in a boiler furnace, when the load of the furnace is suddenly increased due to the burning of poor coal or the abnormal operation of a boiler, the temperature of a shell of a nozzle of a burner is overhigh, so that the shell of the nozzle is deformed, the service life of the nozzle is influenced, the stable combustion of the furnace is not facilitated, and the safe operation of a unit is influenced for a long time. The premixing mode of the pulverized coal and air also affects the combustion stability and uniformity in the boiler, and the premixing combustion of the pulverized coal and the air is a common combustion mode of a boiler unit. For the pulverized coal gas fed into the furnace, the flame is delayed by too low a temperature. Experimental research shows that the temperature of primary air flow is very beneficial to coal dust ignition, so that the increase of the temperature of hot air is one of necessary measures for increasing the ignition speed and the ignition stability of coal dust.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a developed an anti high temperature of ear cap formula mixes burning nozzle in advance, through first passageway and second passageway cooperation, made the entering fuel mix in advance to cool down the nozzle through the mechanism of intaking, prevent that the nozzle warp, heat the fuel wind in the second passageway through the mechanism of going out water, improve boiler combustion efficiency.
The utility model provides a technical scheme does:
an earcap-type high temperature resistant premix combustion nozzle comprising:
a first housing;
the guide plates are uniformly distributed along the outer surface of one end of the first shell;
the first channel is coaxially arranged in the first shell, one end of the first channel is of a cylindrical structure, and the other end of the first channel is of a circular truncated cone-shaped structure with the radius gradually reduced;
the second shell is coaxially sleeved outside the first shell;
a second channel disposed coaxially between the first housing and the second housing;
a water inlet mechanism provided outside the second housing;
the water outlet mechanism is arranged between the water inlet mechanism and the second shell and communicated with the water inlet mechanism;
the water inlet mechanism and the water outlet mechanism are of a cylindrical structure at one end and of a hemispherical structure at the other end, and openings are formed in the end faces of the other ends of the first shell and the second shell.
Preferably, the water inlet mechanism includes:
the water inlet channel is arranged at one end of the water inlet mechanism;
the first spiral water channel is spirally arranged along the other end of the water inlet mechanism, and one end of the first spiral water channel is communicated with the water inlet channel;
the mechanism of going out water includes:
the water outlet channel is arranged at one end of the water inlet mechanism;
and the second spiral water channel is spirally arranged along the other end of the water outlet mechanism, one end of the second spiral water channel is communicated with the water outlet channel, and the other end of the second spiral water channel is communicated with the other end of the first spiral water channel.
Preferably, the first spiral channel is identical in structure to the second spiral channel and includes at least four spiral channels.
Preferably, each segment of the spiral channel further comprises:
the water distribution device comprises a first layer of water channel, a second layer of water channel and a third layer of water channel which are communicated with each other, wherein the cross sections of the first layer of water channel, the second layer of water channel and the third layer of water channel are of square structures and are distributed at equal intervals, and the cross section area of the first layer of water channel is larger than that of the second layer of water channel and that of the third layer of water channel.
Preferably, the water inlet channel is connected with one end of the first spiral water channel through a communication water channel.
Preferably, the radius of one end of the truncated cone-shaped structure of the first channel is 50mm, and the radius of the other end of the truncated cone-shaped structure of the first channel is gradually reduced to 20 mm.
Preferably, the number of baffles is eight and the central angle of the baffles is 20 °.
Preferably, the baffles are arranged at equal intervals along the outer surface of one end of the first shell.
Preferably, the method further comprises the following steps: the nozzle shell comprises a cylindrical structure and a hemispherical structure, and an end face opening is formed in one end of the hemispherical structure.
Beneficial effect: the utility model provides a high temperature resistant premix burning nozzle for boiler burning is applicable to the boiler that the boiler load is big, use the inferior coal, the unstable situation easily appears in burning, through setting up water inlet mechanism, can cool down the nozzle, can effectively prevent the high temperature deformation of combustor nozzle; through first passageway and the cooperation of second passageway to set up the guide plate, make the utility model discloses have and mix the function in advance to can carry out the intensive mixing with buggy and air before getting into the furnace burning, thereby can make the buggy burning fully stable.
The utility model only needs to introduce a small amount of cooling water, and can effectively cool the nozzle by circling and reflowing from outside to inside in the external structure of the nozzle, thereby preventing the nozzle from high-temperature deformation; the final heat of the outer surface of the nozzle shell is controlled by controlling the temperature difference between the cooling water and the nozzle shell, so that the temperature of the outer surface of the nozzle shell is controlled, and the cooling effect on the nozzle is guaranteed. Meanwhile, the fuel air entering the furnace can be preheated, so that the situation that the temperature of the fuel gas entering the furnace is too low to cause delayed combustion is further prevented; and the efficiency of the unit can be improved. The coal dust and the air can be fully mixed and form rotary jet flow before entering the hearth for combustion in the internal structure, the combustion stability of the hearth is improved, and the structure of the combustor can be further simplified.
Drawings
Fig. 1 is a schematic view of a cross-sectional structure of an ear-cap type high-temperature resistant premixed combustion nozzle of the present invention.
Fig. 2 is a bottom view of the ear-cap type high temperature resistant premixed combustion nozzle of the present invention.
Fig. 3 is an axial view of the ear-cap type high temperature resistant premixed combustion nozzle of the present invention.
Fig. 4 is a bottom view of the second channel inner structure according to the present invention.
Fig. 5 is a bottom view of the water inlet mechanism and the water outlet mechanism of the present invention.
Fig. 6 is a flowchart of the working process of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.
As shown in fig. 1-6, the utility model provides an ear cap type high temperature resistant premixing combustion nozzle, include: the first channel 120, the second channel 110, the first shell 130, the second shell 140, the water outlet mechanism, the water inlet mechanism and the guide plate 170.
The integral one end of the combustion nozzle is a cylindrical structure, the other end of the combustion nozzle is a semispherical structure with an opening, and the end face of the semispherical structure is a plane structure.
One end of the first housing 130 is a cylindrical structure, the other end of the first housing 130 is a hemispherical structure with an opening, a cavity is arranged in the first housing 130, the first passage 120 is arranged in the first housing 130, one end of the first passage 120 is a cylindrical structure, and the other end of the first passage is a circular truncated cone-shaped structure with a gradually reduced radius, so that the wind speed of secondary wind can be increased.
The second housing 140 is disposed outside the first housing 130, the second housing 140 has the same structure as the first housing 130, one end of the second housing 140 is a cylindrical structure, the other end of the second housing is a hemispherical structure with an opening, and the second channel 110 is disposed between the second housing 140 and the first housing 130.
In the present invention, as an optimization, the radius of the truncated cone structure is gradually reduced from 50mm to 20 mm.
At one end of the first housing 130, on the outer surface of the hemispherical structure, a plurality of baffles 170 are also uniformly arranged.
In the present invention, as a preferred option, the whole of the baffle 170 is triangular, and the central angle of the baffle 170 on the hemispherical structure is 20 °.
Preferably, the rotation angle of the deflector 170 is 45 °, and the deflector 190 can guide the pulverized coal airflow into a 45 ° rotary jet, and the 45 ° rotary jet has good combustion stability and cleanness.
In the present invention, it is preferable that the number of the guide plates 170 is eight.
The hemispherical structure of the first housing 140 can guide the airflow and, in combination with the eight swirl plates having a 45 ° rotation angle, guide the primary air.
A water inlet mechanism is further sleeved outside the second shell 140, a water outlet mechanism is further arranged between the second shell 140 and the water inlet mechanism, and the water inlet mechanism is communicated with the water outlet mechanism.
The mechanism of intaking includes inlet channel 161 and first dish water course 162 soon, and inlet channel 161 sets up in the one end of the mechanism of intaking, is located cylindrical structure, and first dish water course 162 is seted up at the other end of the mechanism of intaking, is located hemispherical structure to circle the setting along hemispherical structure's circumference. One end of the first spiral water channel 162 is communicated with one end of the water inlet channel 161 through a communication water channel.
The water outlet mechanism comprises a water outlet channel 151 and a second spiral water channel 152, wherein the water outlet channel 151 is arranged at one end of the water outlet mechanism and is positioned on the cylindrical structure, and the second spiral water channel 152 is arranged at the other end of the water outlet mechanism and is positioned on the hemispherical structure and is arranged in a spiral mode along the circumferential direction of the hemispherical structure. One end of the second spiral water passage 152 is communicated with one end of the water outlet passage 151 through a communicating water passage, and the other end of the second spiral water passage 152 is communicated with the other end of the water inlet passage 161 through a communicating water passage. Water flows through the water inlet mechanism and then enters the water outlet mechanism through the connecting water channel.
The first spiral water channel 152 and the second spiral water channel 162 have the same structure and comprise at least four spiral channels, each spiral channel further comprises three water channels, and the three water channels are sequentially arranged from one end of the nozzle to the other end of the nozzle: the cross-section area of each layer of water channel is square, and the cross-section area of the first layer of water channel is larger than that of the second layer of water channel and that of the third layer of water channel, wherein the first layer of water channel, the second layer of water channel and the third layer of water channel are communicated with each other. The three layers of water channels are a big layer, a small layer and three layers, and respectively represent a 50% water channel, a 25% water channel and a 25% water channel; when the load of the boiler is 50%, cooling water only flows through 50% of the water channels by changing the flow of the cooling water; when the load of the boiler is 75%, cooling water flows through the 50% water channel and the middle 25% water channel; when the boiler is in full-load operation, cooling water flows through each spiral water channel in the whole water channel and is divided into a large layer, a small layer and a large layer, wherein the large layer and the small layer respectively represent a 50% water channel, a 25% water channel and a 25% water channel; when the load of the boiler is 50%, cooling water only flows through 50% of the water channels by changing the flow of the cooling water; when the load of the boiler is 75%, cooling water flows through the 50% water channel and the middle 25% water channel; when the boiler is in full-load operation, cooling water flows through the entire water channel.
As shown in fig. 2 and 5, in the water outlet mechanism, the connection ports of the water outlet channel 151 and the first spiral water channel 152 are communication water channels 153, in the water inlet mechanism, the connection ports of the water inlet channel 161 and the second spiral water channel 162 are communication water channels 153, and the communication water channels 153 are respectively arranged at one position in the water inlet mechanism and the water outlet mechanism. The stepped channel 154 is used to serially connect two adjacent spiral channels, three positions are provided in each of the water inlet mechanism and the water outlet mechanism, and the connecting channel 163 is used to connect the first spiral channel 152 and the second spiral channel 162. The air mixing zone 180 is a section of straight duct where secondary air is mixed.
In the present invention, it is preferable that the cross-sectional area of the four-segment spiral passage of the first spiral water passage 152 is 10 × 10.104mm in order2、10.238*10.707mm2、11.07*12.191mm2、 13.065*16.21mm2The cross-sectional area of the four-segment spiral channel of the second spiral water channel 162 is as follows: 10 × 10.131mm2、10.302*10.913mm2、11.403*13.027mm2、14.436*17.078mm2And the cross-sectional area of each section is the sum of the cross-sectional areas of the three layers of water channels.
In the present invention, as a preferred option, the central angle of the communicating water channel 153 is 20 °, the central angle of the step channel 154 is 20 °, and the central angle of the front segment connecting water channel 163 is 20 °.
The first passage 120 is an internal fuel premixing passage for providing a main amount of air for combustion in the furnace and providing a combustion-supporting jet. The radius of the circular truncated cone-shaped structure at the other end of the first channel 120 is gradually reduced from 50mm to 20mm, so that the wind speed of secondary wind induced by a wind box can be increased, and stable jet flow can be improved; the air volume ratio of the primary air and the secondary air is respectively 30% and 20% of the total air volume, primary air coal powder airflow from a coal mill is communicated into the second channel 110, the airflow carries coal powder at the other end of the second channel to rotate to form an angle of 45 degrees, the rotating flowing air is mixed with jet flow of the first channel 120 in a clamping mode to form rotating jet flow, and the rotating jet flow enters a hearth through a direct-current air mixing area 180 to form final jet flow.
As shown in fig. 6, the low-temperature cooling water is led out from the header or the water wall, enters the water inlet channel 161 of the water inlet mechanism, enters the first spiral water channel 152 of the water inlet mechanism through the communicating water channel 153 to be coiled, absorbs the heat of the outer wall of the nozzle 100 to cool the outer shell of the nozzle 100, the cooling water after absorbing heat is communicated with the other end of the second spiral water channel 162 at the other end of the first spiral water channel 152 through the connecting water channel 163, enters the water outlet mechanism, and flows back through the second spiral water channel 162 to form a counter-flow arrangement with the water inlet mechanism, thereby enhancing the heat exchange; and serves to heat the fuel wind in the second passage 110 within the second housing 140. When the nozzle preheats fuel air, the heat efficiency of the boiler unit can be improved by 0.5-1%.
While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.
Claims (9)
1. An earcap-type high temperature resistant premix combustion nozzle, comprising:
a first housing;
the guide plates are uniformly distributed along the outer surface of one end of the first shell;
the first channel is coaxially arranged in the first shell, one end of the first channel is of a cylindrical structure, and the other end of the first channel is of a circular truncated cone-shaped structure with the radius gradually reduced;
the second shell is coaxially sleeved outside the first shell;
a second channel disposed coaxially between the first housing and the second housing;
a water inlet mechanism provided outside the second housing;
the water outlet mechanism is arranged between the water inlet mechanism and the second shell and communicated with the water inlet mechanism;
the water inlet mechanism and the water outlet mechanism are of a cylindrical structure at one end and of a hemispherical structure at the other end, and openings are formed in the end faces of the other ends of the first shell and the second shell.
2. The earcap-type high temperature resistant premix combustion nozzle of claim 1, wherein the water intake mechanism comprises:
the water inlet channel is arranged at one end of the water inlet mechanism;
the first spiral water channel is spirally arranged along the other end of the water inlet mechanism, and one end of the first spiral water channel is communicated with the water inlet channel;
the mechanism of going out water includes:
the water outlet channel is arranged at one end of the water inlet mechanism;
and the second spiral water channel is spirally arranged along the other end of the water outlet mechanism, one end of the second spiral water channel is communicated with the water outlet channel, and the other end of the second spiral water channel is communicated with the other end of the first spiral water channel.
3. The earcap-type high temperature resistant premix combustion nozzle of claim 2 wherein said first spiral water passage is identical in construction to said second spiral water passage and comprises at least four segments of spiral passages.
4. The earcap-type high temperature resistant premix combustion nozzle of claim 3, wherein each segment of the convoluted passage further comprises:
the water distribution device comprises a first layer of water channel, a second layer of water channel and a third layer of water channel which are communicated with each other, wherein the cross sections of the first layer of water channel, the second layer of water channel and the third layer of water channel are of square structures and are distributed at equal intervals, and the cross section area of the first layer of water channel is larger than that of the second layer of water channel and that of the third layer of water channel.
5. The earcap-type high temperature resistant premix combustion nozzle of claim 4, wherein said water inlet channel is connected to an end of said first spiral water channel by a communication water channel.
6. The earcap-type high temperature resistant premix combustion nozzle of claim 5, wherein the radius of one end of the truncated cone-shaped structure of the first passage is 50mm and the radius of the other end is gradually reduced by 20 mm.
7. The earcap high temperature resistant premix combustion nozzle of claim 6 wherein said baffles are eight in number and said baffles have a central angle of 20 °.
8. The ear-cap high temperature resistant premix combustion nozzle of claim 6, wherein said baffles are equally spaced along an outer surface of one end of said first casing.
9. The earcap high temperature resistant premix combustion nozzle of claim 8, further comprising: the nozzle shell comprises a cylindrical structure and a hemispherical structure, and an end face opening is formed in one end of the hemispherical structure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020000562.7U CN211260782U (en) | 2020-01-02 | 2020-01-02 | Ear cap type high-temperature-resistant premixing combustion nozzle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020000562.7U CN211260782U (en) | 2020-01-02 | 2020-01-02 | Ear cap type high-temperature-resistant premixing combustion nozzle |
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| CN211260782U true CN211260782U (en) | 2020-08-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111059529A (en) * | 2020-01-02 | 2020-04-24 | 吉林大学 | Ear-cap type high-temperature-resistant premixed combustion nozzle and control method thereof |
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- 2020-01-02 CN CN202020000562.7U patent/CN211260782U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111059529A (en) * | 2020-01-02 | 2020-04-24 | 吉林大学 | Ear-cap type high-temperature-resistant premixed combustion nozzle and control method thereof |
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