CN212081299U - Low-nitrogen combustion equipment and air material supply device thereof - Google Patents
Low-nitrogen combustion equipment and air material supply device thereof Download PDFInfo
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- CN212081299U CN212081299U CN202020680936.4U CN202020680936U CN212081299U CN 212081299 U CN212081299 U CN 212081299U CN 202020680936 U CN202020680936 U CN 202020680936U CN 212081299 U CN212081299 U CN 212081299U
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Abstract
The utility model discloses a low-nitrogen combustion device and a wind material supply device thereof, wherein the wind material supply device comprises a combustion-supporting gas inlet pipe and a fuel inlet pipe, and the fuel inlet pipe is partially inserted into the combustion-supporting gas inlet pipe; the outlet pipe section of the fuel inlet pipe is connected with a pre-burning pipe, the pipe wall of the pre-burning pipe is provided with air holes, the outlet pipe section of the combustion-supporting air inlet pipe is a gradually expanding pipe section gradually expanding along the airflow direction, the pre-burning pipe is positioned in the combustion-supporting air inlet pipe, and the outlet end of the pre-burning pipe is arranged in a gap with the outlet end of the combustion-supporting air inlet pipe; the ignition device also comprises an igniter which can ignite the fuel and the combustion-supporting gas in the pre-combustion pipe. The utility model provides a windy material feeding device can effectively reduce nitrogen oxide's formation to accord with the emission standard of flue gas.
Description
Technical Field
The utility model relates to a combustion apparatus technical field, concretely relates to low-nitrogen combustion apparatus and wind material feeding device thereof.
Background
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of an air supply device of a conventional combustion apparatus.
As shown in fig. 1, in the air supply device of the conventional combustion equipment, a fuel inlet pipe 02 is inserted into a combustion-supporting air inlet pipe 01 and fixed in a fire-resistant lining flame path 03 of a hearth through the combustion-supporting air inlet pipe 01, the fuel enters the fuel inlet pipe 02 from a fuel inlet 021 and is sprayed out from a fuel nozzle 022, the combustion-supporting air entering from a self-help fuel gas inlet 011 is mixed in a mixing nozzle 012 and then directly sprayed into the hearth for combustion, in order to ensure that the fuel can be fully combusted, modes such as high temperature, excess oxygen supply, centralized combustion and the like are generally adopted, correspondingly, the central temperature of flame in a combustion area of a furnace body is higher, so that NO in flue gas is causedXThe content is high, and the emission requirement is difficult to meet.
Therefore, how to provide a solution to reduce NO in flue gas as much as possibleXContent, the technical problem to be solved by the skilled person is still needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a low-nitrogen combustion equipment and wind material feeding device thereof, wherein, this wind material feeding device can reduce the NO in the flue gasXAnd (4) content.
In order to solve the technical problem, the utility model provides a wind material supply device of low-nitrogen combustion equipment, which comprises a combustion-supporting gas inlet pipe and a fuel inlet pipe, wherein the fuel inlet pipe is partially inserted into the combustion-supporting gas inlet pipe; the outlet pipe section of the fuel inlet pipe is connected with a pre-burning pipe, the pipe wall of the pre-burning pipe is provided with air holes, the outlet pipe section of the combustion-supporting air inlet pipe is a gradually expanding pipe section gradually expanding along the airflow direction, the pre-burning pipe is positioned in the combustion-supporting air inlet pipe, and the outlet end of the pre-burning pipe is arranged in a gap with the outlet end of the combustion-supporting air inlet pipe; the ignition device also comprises an igniter which can ignite the fuel and the combustion-supporting gas in the pre-combustion pipe.
Adopt above-mentioned structure, the export pipeline section that the fuel advances the pipe is connected with the precombustion pipe, and the perisporium of precombustion pipe is equipped with the gas pocket for the combustion-supporting gas in the combustion-supporting gas inlet pipe can get into the precombustion intraductal precombustion through the gas pocket and carry out precombustion, and at this moment, the fuel in the precombustion pipe is in the state of oxygen deficiency burning, and oxygen in the combustion-supporting gas can be preferentially carry out combustion reaction with the fuel, and does not react with nitrogenXThereby achieving the purpose of reducing nitrogen combustion; the divergent pipe section is designed to be divergent, after the high-temperature mixed gas in the pre-combustion pipe is discharged from the outlet end of the pre-combustion pipe, the high-temperature mixed gas can be mixed with the high-speed combustion-supporting gas in the combustion-supporting gas inlet pipe and flows to the outer edge of the divergent pipe section in an external diffusion mode, so that a certain degree of negative pressure is generated in the central area of the divergent pipe section, high-temperature flue gas in a furnace body of low-nitrogen combustion equipment can be forced to flow back, the oxygen concentration in the divergent pipe section can be further reduced, the temperature of a flame high-temperature area is reduced, and the generation of thermal type nitrogen oxides is.
Therefore, adopt the utility model provides a windy material feeding device can effectively reduce nitrogen oxide's formation to accord with the emission standard of flue gas.
Optionally, the pre-combustion pipe comprises an installation pipe section, a reducing pipe section, a throat pipe section and an expansion pipe section, the installation pipe section is used for being connected with the fuel inlet pipe, the large-diameter end of the reducing pipe section is connected with the installation pipe section, the small-diameter end of the reducing pipe section is connected with one end of the throat pipe section, the other end of the throat pipe section is connected with the expansion pipe section, and the pipe wall of the reducing pipe section is provided with the air hole.
Optionally, the expansion pipe section comprises an equal-diameter section, the radial dimension of the equal-diameter section is larger than that of the throat section, a step surface is formed between the equal-diameter section and the throat section, and the step surface and/or the pipe wall of the equal-diameter section is provided with the air holes.
Optionally, the air holes are distributed at a plurality of axial positions of the equal-diameter section, and a first baffle is arranged between the air holes at two axially adjacent positions.
Optionally, the expanded pipe section further comprises a diverging section, a small diameter end of the diverging section is connected with the equal diameter section, and the diverging section is also provided with the air hole.
Optionally, a second baffle is arranged on the outer wall of the gradually expanding section, and the second baffle is located at the downstream of the air hole of the gradually expanding section; and/or, the divergent section is at least partially located within the divergent section.
Optionally, the mounting tube segment is connected to the fuel inlet tube in a telescoping length adjustable manner.
Optionally, at least a part of the air holes in each air hole are distributed at intervals along the axial direction of the pre-burning pipe, and the flow rate of the air hole at the downstream position in the axial direction is larger than that of the air hole at the adjacent upstream position.
Optionally, the inner wall of the divergent pipe section is provided with swirl guide structures distributed at intervals along the circumferential direction.
Optionally, when the fuel provided by the fuel inlet pipe is liquid fuel, a fuel nozzle is arranged at the outlet of the fuel inlet pipe.
Optionally, the ignition position of the igniter is positioned in the pre-combustion pipe, or the ignition position of the igniter is positioned between the outlet end of the pre-combustion pipe and the outlet end of the combustion-supporting air inlet pipe; and/or, further comprises an igniter for monitoring the ignition condition.
The utility model also provides a low-nitrogen combustion device, including furnace body and wind material feeding device, wind material feeding device is foretell low-nitrogen combustion device's wind material feeding device.
Since the above-mentioned air material supply device of the low-nitrogen combustion device already has the technical effects, the low-nitrogen combustion device with the air material supply device also has similar technical effects, and therefore, the detailed description thereof is omitted here.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a wind material supply device of a conventional combustion apparatus;
fig. 2 is a schematic structural diagram of an embodiment of the air supply device of the low-nitrogen combustion apparatus provided by the present invention;
FIG. 3 is a schematic structural view of a pre-combustion tube;
FIG. 4 is a schematic view of a divergent segment configuration;
fig. 5 is a schematic structural diagram of another embodiment of the air supply device of the low-nitrogen combustion apparatus according to the present invention.
The reference numerals in fig. 1 are explained as follows:
01 a combustion-supporting gas inlet pipe, 011 a combustion-supporting gas inlet and 012 a mixing spray head;
02 fuel inlet pipe, 021 fuel inlet, 022 fuel nozzle;
03 fire-resistant inner lining flame path of furnace.
The reference numerals in fig. 2-5 are illustrated as follows:
1, a combustion-supporting gas inlet pipe, 11 divergent pipe sections, 111 swirl grooves and 12 combustion-supporting gas inlets;
2 fuel inlet pipe, 21 fuel nozzle, 22 fuel inlet;
3 pre-combustion pipes, 31 installation pipe sections, 32 reducing pipe sections, 33 throat pipe sections, 34 expanding pipe sections, 341 equal-diameter sections, 341a step surfaces, 341b first baffle plates, 342 gradually expanding sections, 342a second baffle plates, 3a air holes, 3a-1 first-stage air holes, 3a-2 second-stage air holes, 3a-3 third-stage air holes, 3a-4 fourth-stage air holes and 3a-5 fifth-stage air holes;
4, an igniter;
5, monitoring the fire device.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As used herein, the term "plurality" refers to an indefinite number of plural, usually more than two; and when the term "plurality" is used to indicate a quantity of a particular element, it does not indicate a quantitative relationship between such elements.
The terms "first," "second," and the like, herein are used for convenience in describing two or more structures or components that are identical or similar in structure and/or function and do not necessarily denote any particular limitation in order and/or importance.
Referring to fig. 2-5, fig. 2 is a schematic structural diagram of an embodiment of an air supply device of a low-nitrogen combustion apparatus provided in the present invention, fig. 3 is a schematic structural diagram of a pre-combustion pipe, fig. 4 is a schematic structural diagram of a divergent pipe section, and fig. 5 is a schematic structural diagram of another embodiment of an air supply device of a low-nitrogen combustion apparatus provided in the present invention.
As shown in fig. 2, the utility model provides a wind material supply device of low-nitrogen combustion equipment, which comprises a combustion-supporting gas inlet pipe 1 and a fuel inlet pipe 2, wherein the fuel inlet pipe 2 is partially inserted into the combustion-supporting gas inlet pipe 1; the outlet pipe section of the fuel inlet pipe 2 is connected with a pre-burning pipe 3, the pipe wall of the pre-burning pipe 3 is provided with an air hole 3a, the outlet pipe section of the combustion-supporting air inlet pipe 1 is a gradually expanding pipe section 11 which gradually expands along the airflow direction, the pre-burning pipe 3 is positioned in the combustion-supporting air inlet pipe 1, and the outlet end of the pre-burning pipe 3 is arranged in a gap with the outlet end of the combustion-supporting air inlet pipe 1; the burner also comprises an igniter 4, and the igniter 4 can ignite the fuel and the combustion-supporting gas in the pre-burning pipe 3.
The combustion-supporting air inlet pipe 1 is further provided with a combustion-supporting air inlet 12, the fuel inlet pipe 2 is further provided with a fuel inlet 22, when the fuel-supporting air inlet pipe is used, combustion-supporting air can be introduced into the combustion-supporting air inlet pipe 1 through the combustion-supporting air inlet 12, and fuel can be introduced into the fuel inlet pipe 2 through the fuel inlet 22. The fuel is mainly gas fuel (natural gas, coal gas, etc.) or liquid fuel (fuel oil, flammable waste liquid, etc.) with certain fluidity, when liquid fuel is adopted, as shown in fig. 5, the outlet of the fuel inlet pipe 2 can also be provided with a fuel nozzle 21 for scattering the liquid fuel in the fuel inlet pipe 2 into liquid drops so as to facilitate the mixing and ignition of the subsequent fuel and the combustion-supporting gas; specifically, the fuel nozzle 21 may be an atomizing nozzle, and at least compressed air is introduced to the atomizing nozzle to form atomized droplets, which is more favorable for uniform mixing of the fuel and the combustion-supporting gas.
The embodiment of the utility model provides an in, the export pipeline section that the fuel advances pipe 2 is connected with pre-burning pipe 3, and the perisporium of pre-burning pipe 3 is equipped with gas pocket 3a for the combustion-supporting gas that the combustion-supporting gas advances in the pipe 1 can advance the burning through gas pocket 3a entering pre-burning pipe 3 in and burn, and at this moment, the fuel in the pre-burning pipe 3 is in the state of oxygen deficiency burning, and oxygen in the combustion-supporting gas can be preferentially carry out combustion reaction with the fuel, and do not react with nitrogen gas and generate NOXThereby achieving the purpose of reducing nitrogen combustion; the divergent pipe section 11 is designed to be divergent, after the high-temperature mixed gas in the pre-combustion pipe 3 is discharged from the outlet end of the pre-combustion pipe, the high-temperature mixed gas can be mixed with the high-speed combustion-supporting gas in the combustion-supporting gas inlet pipe 1 and flows to the outer edge of the divergent pipe section 11 in an external diffusion mode, so that a certain degree of negative pressure is generated in the central area of the divergent pipe section 11, high-temperature flue gas in a low-nitrogen combustion device furnace body can be forced to flow back, the oxygen concentration in the divergent pipe section 11 can be further reduced, the temperature of a flame high-temperature area is reduced, and the generation of thermal nitrogen oxides is reduced.
Therefore, adopt the utility model provides a windy material feeding device can effectively reduce nitrogen oxide's formation to accord with the emission standard of flue gas.
The nitrogen oxides in the flue gas mainly include a thermal type and a material type, wherein the thermal type mainly refers to nitrogen oxides formed by combustion of nitrogen in air at a high temperature, and the material type refers to nitrogen oxides formed by combustion of nitrogen-containing compounds in materials; generally, nitrogen oxides in flue gas are mainly of the thermal type, and the higher the flame temperature and the higher the oxygen concentration during combustion, the longer the flue gas stays in a high-temperature zone, the more the thermal type nitrogen oxides.
In a specific embodiment, as shown in fig. 2 and 3, the pre-combustion pipe 3 may include a mounting pipe section 31, a reduced diameter pipe section 32, a throat section 33, and an expansion pipe section 34, the mounting pipe section 31 may be configured to be connected to the fuel inlet pipe 2, a large diameter end of the reduced diameter pipe section 32 may be connected to the mounting pipe section 31, a small diameter end of the reduced diameter pipe section 32 may be connected to one end of the throat section 33, the other end of the throat section 33 may be connected to the expansion pipe section 34, and a pipe wall of the reduced diameter pipe section 32 is provided with air holes 3 a.
By adopting the structure, the reducing pipe section 32 and the throat section 33 can be combined to form a Venturi structure, the flow speed of fuel can be increased, at the moment, the flow speed of the fuel in the reducing pipe section 32 is increased, negative pressure can be formed in the reducing pipe section 32 relative to the outside, the combustion-supporting gas in the combustion-supporting gas inlet pipe 1 can be sucked into the reducing pipe section 32 to be mixed with the fuel in the reducing pipe section 32, and meanwhile, the structural design can also effectively prevent flame from burning in the reverse airflow direction.
The air holes 3a provided in the reduced diameter pipe section 32 may be distributed at the same position in the axial direction or at different positions in the axial direction, and the number of the air holes 3a located at the same position in the axial direction may be one or more, and when there are a plurality of air holes, the air holes 3a may be distributed at intervals in the circumferential direction. In the embodiment of fig. 3, the gas holes 3a of the reduced diameter pipe sections 32 are distributed at the same position in the axial direction, and for the convenience of description, the part of the gas holes 3a may be referred to as a first-stage gas hole 3 a-1.
The radial dimension of the expanded pipe section 34 may be larger than that of the throat section 33, and taking the scheme in fig. 3 as an example, the expanded pipe section 34 may include a constant diameter section 341, the radial dimension of the constant diameter section 341 may be larger than that of the throat section 33, a step surface 341a may be formed between the constant diameter section 341 and the throat section 33, and the step surface 341a may be provided with the air holes 3 a. For convenience of description, the air holes 3a formed in the step surface 341a may be referred to as second-stage air holes 3a-2, the number of the second-stage air holes 3a-2 may be one, or may be multiple, and when the number of the second-stage air holes 3a-2 is multiple, each of the second-stage air holes 3a-2 may be distributed at intervals in the circumferential direction of the step surface 341a, and the combustion-supporting air in the combustion-supporting air inlet pipe 1 may enter the equal-diameter section 341 through the second-stage air holes 3 a-2.
The tube wall of the equal-diameter section 341 may also be provided with air holes 3a, and the air holes 3a provided in the equal-diameter section 341 may be distributed at a plurality of axial positions, the air hole 3a at each axial position may be one, or may also be a plurality of air holes distributed at intervals in the circumferential direction, a first baffle 341b may be provided between the air holes 3a at two axially adjacent positions, the first baffle 341b may be a circumferential closed ring plate, or may be a circumferential non-closed plate, such as an arc plate, and this is specifically related to the number of the air holes 3a distributed at each axial position.
In the embodiment of fig. 3, the air holes 3a may be distributed at two axial positions of the constant diameter section 341, and the aforementioned first baffle 341b may be disposed between the two axial positions, for convenience of description, the air hole 3a at the relatively axial upstream side may be referred to as a third stage air hole 3a-3, and the air hole 3a at the relatively axial downstream side may be referred to as a fourth stage air hole 3a-4, and the first baffle 341b therebetween may function to intercept the air flow to increase the resistance of the air flow, so that more combustion-supporting air may enter the constant diameter section 341 from the third stage air hole 3 a-3.
When the air holes 3a are distributed at three or more positions in the axial direction of the equal-diameter section 341, two or more first baffles 341b may be present in the axial direction of the equal-diameter section 341, and at this time, the radial dimension of the downstream first baffle 341b may be set to be greater than the radial dimension of the adjacent upstream first baffle 341b, so as to gradually increase the interception height of the first baffle 341b close to the downstream, thereby ensuring that each first baffle 341b may be the combustion-supporting air which is located at the upstream thereof and is intercepted by the air holes 3a adjacent thereto.
The expanding pipe section 34 may further include a gradually expanding section 342, a small diameter end of the gradually expanding section 342 may be connected to the equal diameter section 341, the gradually expanding section 342 may also be provided with an air hole 3a, and the combustion-supporting air in the combustion-supporting air inlet pipe 1 may enter the gradually expanding section 342 through the air hole 3a provided in the gradually expanding section 342. The air holes provided in the divergent section 342 may be distributed at the same position in the axial direction, or may be distributed at different positions in the axial direction, and the number of the air holes 3a located at the same position in the axial direction may be one or more, and when the number of the air holes is plural, the air holes 3a located at the same position in the axial direction may be distributed at intervals in the circumferential direction. In the embodiment of fig. 3, the gas holes 3a of the divergent section 342 may be distributed at the same position in the axial direction, and for the convenience of description, the part of the gas holes 3a may be referred to as the fifth stage gas holes 3 a-5.
The outer wall of the divergent section 342 may be provided with a second baffle 342a, and the second baffle 342a is located at the downstream of the air hole 3a of the divergent section 342, and the second baffle 342a has a structure and a function similar to the first baffle 341b, and can intercept the air flow, so that more combustion-supporting air can enter the divergent section 342 through the fifth-stage air holes 3 a-5.
In the above scheme, the air holes 3a are actually distributed at a plurality of positions in the axial direction of the pre-combustion pipe 3, so that the combustion-supporting air can be mixed with the fuel in the pre-combustion pipe 3 for a plurality of times to disperse the combustion positions, each combustion is insufficient in an anoxic state, and the oxygen can preferentially react with the fuel to reduce the combustion of nitrogen as much as possible.
Further, in each of the air holes 3a distributed at intervals in the axial direction, the flow rate of the air hole 3a at the downstream position is smaller than the flow rate of the air hole 3a at the adjacent upstream position, taking the scheme in fig. 3 as an example, the flow rate of the air hole 3a at each position may satisfy the following relationship: the relationship of the first-stage air holes 3a-1, the second-stage air holes 3a-2, the third-stage air holes 3a-3, the fourth-stage air holes 3a-4 and the fifth-stage air holes 3a-5 can be realized by changing the number of the air holes 3a or the aperture of the air holes 3a at each position, so that the quantity of combustion-supporting air mixed into the air holes 3a at different positions in the axial direction of the pre-combustion pipe 3 is continuously increased in the airflow direction to form a combustion state with combustion-supporting air from none to many.
Here, the embodiment of the present invention does not limit the ratio a of the combustion-supporting gas entering the pre-combustion pipe 3 through the air hole 3a to the total amount of the combustion-supporting gas, and in the specific implementation, the skilled person can set the ratio according to the actual requirement, for example, the ratio a can be set to 0.3-0.5, and correspondingly, the ratio B of the combustion-supporting gas between the outlet end of the pre-combustion pipe 3 and the outlet end of the combustion-supporting gas inlet pipe 1 to the total amount of the combustion-supporting gas can be set to 0.5-0.7.
In practical applications, the ratio a can be adjusted by changing the number and/or the aperture of the air holes 3a, or by adjusting the distance between the outlet end of the pre-combustion tube 3 and the outlet end of the diverging tube section 11. For example, the mounting pipe section 31 can be connected to the fuel inlet pipe 2 in a manner of adjustable sleeve length, for example, the mounting pipe section and the fuel inlet pipe can be connected by screw threads, when the distance between the outlet end of the pre-combustion pipe 3 and the outlet end of the divergent pipe section 11 is reduced, the ratio a can be increased to increase the mixing amount of the combustion-supporting gas in the pre-combustion pipe 3, and when the distance between the outlet end of the pre-combustion pipe 3 and the outlet end of the divergent pipe section 11 is increased, the ratio a of the combustion-supporting gas can be reduced, the mixing amount of the combustion-supporting gas in the pre-combustion pipe 3 can be reduced, which is beneficial to improving the furnace temperature of the furnace body; or, the installation pipe section 31 and the fuel inlet pipe 2 may be connected by welding, and at this time, the length of the sleeved portion between the installation pipe section and the fuel inlet pipe may be adjusted as required, and then the installation pipe section and the fuel inlet pipe may be welded and fixed.
Further, at least a part of the diverging section 342 may be located inside the diverging section 11, so that a guiding channel may be formed between the diverging section 342 and the diverging section 11 to guide the high-speed combustion-supporting gas in the combustion-supporting gas inlet pipe 1 to the outer edge of the diverging section 11, which is more beneficial to form a negative pressure in the central area of the diverging section 11.
The inner wall of the divergent pipe section 11 can be further provided with swirl guide structures which are distributed at intervals along the circumferential direction, the swirl guide structures can guide combustion-supporting gas in the combustion-supporting gas inlet pipe 1, so that the combustion-supporting gas forms swirl at a position close to the pipe wall of the divergent pipe section 11, the mixed combustion of high-temperature mixed gas discharged from the outlet end of the pre-combustion pipe 3 and the combustion-supporting gas is favorably ensured at a position close to the pipe wall of the divergent pipe section 11, meanwhile, the central area of the divergent pipe section 11 forms negative pressure, high-temperature low-oxygen flue gas in a hearth is enabled to flow back to the central area of the divergent pipe section 11, the oxygen content and the flame temperature of the flame central area of the divergent pipe section 11 can be reduced. With reference to fig. 4, the swirl guide structure may be a plurality of swirl grooves 111 disposed on the inner pipe wall of the divergent pipe section 11, and each swirl groove 111 may be a linear type or an arc type, which may be determined according to actual conditions; alternatively, the swirl guide structure may be a plurality of swirl ribs disposed on the inner pipe wall of the divergent pipe section 11, and the swirl ribs may also be linear or arc.
It should be noted that the above-mentioned expanded pipe section 34 including the constant diameter section 341 and the diverging section 342 is only an exemplary description of the embodiment of the present invention, and cannot be taken as a limitation to the implementation scope of the wind material supply device provided by the present invention, and other structural forms of the expanded pipe section 34 may also be adopted under the condition that the function is satisfied, for example, the diverging section 342 may be directly adopted to form the expanded pipe section 34, and at this time, the small diameter end of the diverging section 342 may be connected to the throat section 33; in addition, since combustion is performed in the precombustion pipe 3, the material of the precombustion pipe 3 may be a heat-resistant metal material to enhance the heat-resistant performance of the precombustion pipe 3.
The ignition position of the igniter 4 can be positioned in the pre-combustion pipe 3, and the structure can be shown in fig. 2 and 5, at this time, the igniter 4 can directly ignite the fuel and the combustion-supporting gas in the pre-combustion pipe 3; alternatively, the ignition position of the igniter 4 may be located between the outlet end of the pre-combustion pipe 3 and the outlet end of the combustion-supporting air inlet pipe 1, and at this time, the igniter 4 will ignite the fuel and the combustion-supporting air between the outlet end of the pre-combustion pipe 3 and the outlet end of the combustion-supporting air inlet pipe 1 first, and then indirectly ignite the fuel and the combustion-supporting air in the pre-combustion pipe 3.
In order to facilitate the monitoring of the ignition condition, the utility model provides a wind material feeding device can also include the prisoner 5, and the structural style of prisoner 5 can be diversified, and fig. 2, fig. 5 show the prisoner 5 of two kinds of forms respectively promptly, and when concrete implementation, technical personnel in the field can select the type of prisoner according to actual need, as long as can satisfy the use can.
The utility model also provides a low-nitrogen combustion device, including furnace body (not shown in the figure) and wind material feeding device, wherein, wind material feeding device is the wind material feeding device of the low-nitrogen combustion device that above-mentioned each embodiment relates to promptly.
Since the above-mentioned air material supply device of the low-nitrogen combustion device already has the technical effects, the low-nitrogen combustion device with the air material supply device also has similar technical effects, and therefore, the detailed description thereof is omitted here.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (12)
1. The air supply device of the low-nitrogen combustion equipment comprises a combustion-supporting air inlet pipe (1) and a fuel inlet pipe (2), wherein the fuel inlet pipe (2) is partially inserted in the combustion-supporting air inlet pipe (1), and is characterized in that an outlet pipe section of the fuel inlet pipe (2) is connected with a pre-burning pipe (3), an air hole (3a) is formed in the pipe wall of the pre-burning pipe (3), an outlet pipe section of the combustion-supporting air inlet pipe (1) is a gradually expanding pipe section (11) which gradually expands along the airflow direction, the pre-burning pipe (3) is positioned in the combustion-supporting air inlet pipe (1), and the outlet end of the pre-burning pipe (3) is arranged in a gap with the outlet end of the combustion-supporting air inlet pipe (1);
the fuel pre-combustion device further comprises an igniter (4), and the igniter (4) can ignite fuel and combustion-supporting gas in the pre-combustion pipe (3).
2. The air supply device of the low-nitrogen combustion equipment is characterized in that the pre-combustion pipe (3) comprises a mounting pipe section (31), a reducing pipe section (32), a throat pipe section (33) and an expansion pipe section (34), the mounting pipe section (31) is used for being connected with the fuel inlet pipe (2), the large-diameter end of the reducing pipe section (32) is connected with the mounting pipe section (31), the small-diameter end of the reducing pipe section (32) is connected with one end of the throat pipe section (33), the other end of the throat pipe section (33) is connected with the expansion pipe section (34), and the air holes (3a) are formed in the pipe wall of the reducing pipe section (32).
3. The air supply device of low-nitrogen combustion equipment according to claim 2, characterized in that the expanding pipe section (34) comprises an equal-diameter section (341), the radial dimension of the equal-diameter section (341) is larger than that of the throat pipe section (33), a step surface (341a) is formed between the equal-diameter section (341) and the throat pipe section (33), and the step surface (341a) and/or the pipe wall of the equal-diameter section (341) is provided with the air holes (3 a).
4. The air supply device of the low-nitrogen combustion equipment according to claim 3, wherein the air holes (3a) are distributed at a plurality of positions in the axial direction of the equal-diameter section (341), and a first baffle (341b) is arranged between the air holes (3a) at two axially adjacent positions.
5. The air supply device of low-nitrogen combustion equipment according to claim 3, characterized in that the expanding pipe section (34) further comprises a diverging section (342), the small diameter end of the diverging section (342) is connected with the constant diameter section (341), and the diverging section (342) is also provided with the air holes (3 a).
6. The air supply device of the low-nitrogen combustion equipment according to claim 5, characterized in that the outer wall of the divergent section (342) is provided with a second baffle (342a), and the second baffle (342a) is positioned at the downstream of the air hole (3a) of the divergent section (342); and/or the presence of a gas in the gas,
the diverging section (342) is located at least partially within the diverging tube section (11).
7. The air supply device of low-nitrogen combustion equipment according to claim 2, characterized in that the mounting pipe section (31) is connected with the fuel inlet pipe (2) in a manner of adjustable sleeve length.
8. The air supply device of a low-nitrogen combustion apparatus according to any one of claims 1-7, characterized in that at least some of the air holes (3a) in each air hole (3a) are distributed at intervals along the axial direction of the pre-combustion pipe (3), and the flow rate of the air hole (3a) at the downstream position in the axial direction is larger than that of the air hole (3a) at the adjacent upstream position.
9. The air supply device of the low-nitrogen combustion equipment as claimed in any one of claims 1 to 7, wherein the inner wall of the divergent pipe section (11) is provided with swirl flow guide structures which are distributed at intervals along the circumferential direction.
10. The air supply device of the low-nitrogen combustion equipment as claimed in any one of claims 1-7, characterized in that when the fuel supplied by the fuel inlet pipe (2) is liquid fuel, the outlet of the fuel inlet pipe (2) is provided with a fuel nozzle (21).
11. The air supply device of the low-nitrogen combustion apparatus according to any one of claims 1 to 7, wherein the ignition position of the igniter (4) is located inside the pre-combustion pipe (3), or the ignition position of the igniter (4) is located between the outlet end of the pre-combustion pipe (3) and the outlet end of the combustion-supporting air inlet pipe (1); and/or the presence of a gas in the gas,
the ignition device also comprises an igniter (5) for monitoring the ignition condition.
12. A low-nitrogen combustion device, comprising a furnace body and an air supply device, wherein the air supply device is the air supply device of the low-nitrogen combustion device of any one of claims 1 to 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111412485A (en) * | 2020-04-28 | 2020-07-14 | 湖南中冶长天节能环保技术有限公司 | Low-nitrogen combustion equipment and air material supply device thereof |
| CN111412485B (en) * | 2020-04-28 | 2024-10-22 | 湖南中冶长天节能环保技术有限公司 | Low-nitrogen combustion equipment and wind material supply device thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111412485A (en) * | 2020-04-28 | 2020-07-14 | 湖南中冶长天节能环保技术有限公司 | Low-nitrogen combustion equipment and air material supply device thereof |
| CN111412485B (en) * | 2020-04-28 | 2024-10-22 | 湖南中冶长天节能环保技术有限公司 | Low-nitrogen combustion equipment and wind material supply device thereof |
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