CN217402606U - Pulverized coal fired boiler ignition oil gun - Google Patents

Abstract

The utility model discloses a pulverized coal boiler ignition oil gun, including the rifle head, including shell, orifice head and the even room that flows of two-phase flow, the orifice head sets up in the inside top of shell, and inside the shell was located to the even room cover of two-phase flow, and the end of its front end and orifice head meets, and the end of the even room that flows of two-phase flow has connected gradually two-phase flow blender and two-phase flow generator. The utility model discloses a can form even small oil film bubble flow in the runner of rifle head central axis formation two-phase flow, the oil film bubble flow bursts at the bubble in the twinkling of an eye that goes out the orifice and makes the broken atomizing of oil film, and fuel surface tension has been overcome to this kind of mode, only needs lower fuel pressure, can effectively utilize gas energy at the atomizing in-process, realizes best atomization effect, makes the abundant burning of fuel high strength, has increased the area of contact of fuel with the air, has improved the evaporation rate. When the granularity of the well atomized fuel is extremely fine, the evaporation and vaporization speed of the fuel is extremely fast, which is more beneficial to fast gasification and strong combustion to form violent high-temperature flame.

Description

Pulverized coal fired boiler ignition oil gun

Technical Field

The utility model relates to liquid fuel combustion technical field especially relates to a pulverized coal boiler ignition oil gun.

Background

The large oil gun is important equipment and means for starting ignition of a coal-fired boiler, stabilizing combustion under low load, stopping a unit in a sliding way, making a powder system in case of failure emergency, and supporting combustion by using fuel oil under low load or during burning of low-quality coal, so that the combustion of the boiler is stable or the boiler is subjected to deep peak regulation to prevent and extinguish fire, and the large oil gun has the advantages of stable and reliable work, energy conservation and environmental protection and is a relatively basic technical requirement.

At present, the ignition mode of the pulverized coal boiler of the power station in China still generally adopts a large oil gun for mechanical atomization to participate in ignition, and for example, a pulverized coal boiler with four tangential corners commonly used in the power station is taken as an example, in a multi-layer secondary air nozzle, a plurality of layers of ignition oil guns are selected and arranged, two layers of ignition oil guns are generally arranged, and for a large pulverized coal boiler, three layers, four layers or more layers of ignition oil guns can be arranged. For boiler ignition of cyclone pulverized coal burners arranged in front-rear wall opposition, it is a common trend to arrange an ignition oil gun in the center tube of each cyclone burner. For pulverized coal boilers with different combustion modes, although the arrangement of ignition oil guns is different, the mechanical atomization oil gun technology is generally adopted.

When the cold furnace starts to ignite, a plurality of layers of ignition oil guns are generally put into use at the same time to heat the hearth, and once air pulverized coal is put into the hearth to burn when the temperature of the hearth is higher than the ignition temperature of the pulverized coal. And after the pulverized coal flame is stably combusted, stopping the oil injection of the ignition oil gun. The heat (output) contributed by the burning of the ignition oil gun is generally designed to be about 30% of the rated load heat energy. Therefore, it is important to ensure sufficient combustion of the oil after its ignition.

For a long time, such conventional oil guns have had a number of disadvantages in performance: the oil is atomized by generally adopting a high-pressure jet mechanical atomization technology, the Solter Mean Diameter (SMD) of oil drops is about 120 mu m, the atomization quality is unstable, and when the atomization quality is reduced, the combustion efficiency is reduced; the system has high pressure requirement, long-term maintenance of a circulating state, high energy consumption, easy damage of equipment and high maintenance workload; when the air distribution of the ignition oil gun is insufficient and the oil atomization effect is poor, the oil is incompletely combusted, and the heat loss is high; in the ignition process, oil atomization is poor, flame is generally not bright enough, and sometimes the flame temperature is below 1100 ℃, so that a large amount of black smoke is entrained by the flame front; in severe cases, even the cold ash bucket and the water wall pipe have flowing fuel oil, which is also the root cause that the chimney emits black smoke and the electric dust collector can not be put into the boiler when the boiler is ignited in a cold state; meanwhile, the oil of the ignition oil gun is not completely combusted due to the factors, and unburnt oil drops and carbonized particles in the flue gas influence the normal operation of the denitration SCR equipment, so that the phenomena of catalyst blockage and inactivation are generated, and further stable denitration is influenced; furthermore, unburned oil droplets and carbonized particles also affect the desulfurization effect of limestone in the desulfurization tower. Obviously, the traditional oil atomization technology cannot meet the current requirements of the generator set on environmental protection performance and economic performance.

SUMMERY OF THE UTILITY MODEL

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the abstract and the title of the present application to avoid obscuring the purpose of this section, the abstract and the title of the present application, and such simplifications or omissions cannot be used to limit the scope of the present invention.

In view of the above-mentioned problem that current pulverized coal boiler ignition oil gun exists, proposed the utility model discloses.

Therefore, the utility model aims at providing a pulverized coal boiler ignition oil gun, its aim at solve current ignition oil gun because the atomizing is not good etc. various factors cause the incomplete combustion of oil, make ignition oil gun realize the atomization effect and the ignition combustion effect of comparison ideal.

In order to solve the technical problem, the utility model provides a following technical scheme: a pulverized coal boiler ignition oil gun comprises a gun head, a gun body and a gun tail, wherein the gun head comprises a shell, a spray hole head and a two-phase flow homogenizing chamber, the spray hole head is arranged at the top end in the shell, the two-phase flow homogenizing chamber is sleeved in the shell, the front end of the two-phase flow homogenizing chamber is connected with the tail end of the spray hole head, and the tail end of the two-phase flow homogenizing chamber is sequentially connected with a two-phase flow mixer and a two-phase flow generator; the gun body comprises a nozzle rear seat and an inner sleeve, the nozzle rear seat is arranged at the tail end of the gun head and is in matched connection with the two-phase flow homogenizing chamber, the inner sleeve is in matched connection with the tail of the two-phase flow generator, and the outer side of the inner sleeve is sleeved with an outer sleeve; and the gun tail comprises an elbow and an oil inlet pipe, one end of the elbow is communicated with the tail part of the inner sleeve, and the oil inlet pipe is arranged at the tail part of the elbow.

As a pulverized coal fired boiler ignition oil gun's an optimal selection scheme, wherein: the spraying hole head is in a forward convex frustum shape, a plurality of two-phase flow spraying holes are formed in the conical surface along the circumferential direction, a plurality of two-phase flow spraying holes are also formed in the forward convex table surface, and a plurality of secondary air channels and small nozzles are arranged on the outer edge of the conical surface.

As a preferred scheme of pulverized coal boiler ignition oil gun, wherein: the two-phase flow generator is bowl-shaped, a plurality of oil inlet holes are formed in the middle of the bottom of the two-phase flow generator, a plurality of air inlet holes are formed in the circumferential side wall of each oil inlet hole, and the oil inlet holes and the air inlet holes are distributed at an approximate 90-degree angle.

As a pulverized coal fired boiler ignition oil gun's an optimal selection scheme, wherein: the outer side of the tail end of the two-phase flow homogenizing chamber is provided with a first external thread, the inner wall of the front end of the spray head rear seat is provided with an internal thread, and the spray head rear seat is connected with the two-phase flow homogenizing chamber in a matched mode through the internal thread and the first external thread.

As a preferred scheme of pulverized coal boiler ignition oil gun, wherein: and a plurality of groups of axial vent holes are arranged between the tubular outer wall of the two-phase flow homocline chamber and the external thread along the circumferential direction.

As a preferred scheme of pulverized coal boiler ignition oil gun, wherein: and a red copper gasket is arranged at the outer side of the joint of the two-phase flow homogenizing chamber and the spray head rear seat, and a red copper gasket is arranged at the joint of the inner sleeve and the two-phase flow generator.

As a preferred scheme of pulverized coal boiler ignition oil gun, wherein: the gun body further comprises a support ring and an end cover, wherein the support ring is clamped between the inner sleeve and the outer sleeve and is connected with the inner sleeve and the outer sleeve; the end cover is annular and is fixedly connected with the tail end of the outer sleeve.

As a preferred scheme of pulverized coal boiler ignition oil gun, wherein: a through hole is formed at the position, close to the tail end, of the outer sleeve, and the through hole is connected with an air inlet pipe;

the outer wall of the tail end of the oil inlet pipe is provided with a second external thread, and the outer wall of the tail end of the air inlet pipe is provided with a third external thread.

As a preferred scheme of pulverized coal boiler ignition oil gun, wherein: a secondary air flow channel and a secondary air small nozzle are formed between the two-phase flow generator, the two-phase flow mixer, the two-phase flow homogenizing chamber, the spray hole head shell and the spray head rear seat; the two-phase flow mixer is internally provided with a Venturi type tubular flow passage.

As a pulverized coal fired boiler ignition oil gun's an optimal selection scheme, wherein: the compressed air amount flowing into the two-phase flow generator is 3% -5% of the fuel mass flow, and the compressed air amount entering the secondary air flow channel is 7% -9% of the fuel mass flow.

The utility model has the advantages that:

the utility model discloses a can form even small oil film bubble flow in the runner of rifle head central axis formation two-phase flow, the oil film bubble flow bursts at the bubble in the twinkling of an eye that goes out the orifice and makes the broken atomizing of oil film, and fuel surface tension has been overcome to this kind of mode, only needs lower fuel pressure, can effectively utilize gas energy at the atomizing in-process, realizes best atomization effect, makes the abundant burning of fuel high strength, has increased the area of contact of fuel with the air, has improved the evaporation rate. When the granularity of the well atomized fuel is extremely fine, the evaporation and vaporization speed of the fuel is extremely fast, which is more beneficial to fast gasification and strong combustion to form violent high-temperature flame.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor. Wherein:

fig. 1 is the schematic view of the whole structure section of the pulverized coal boiler ignition oil gun of the present invention.

Fig. 2 is an enlarged schematic structural view of a in fig. 1 of the ignition oil gun for pulverized coal fired boiler of the present invention.

Fig. 3 is a schematic view of a nozzle head structure of the pulverized coal boiler ignition oil gun of the present invention.

Fig. 4 is a sectional view of the nozzle head of the pulverized coal fired boiler ignition oil gun of the present invention.

Fig. 5 is a schematic structural view of the two-phase flow homogenizing chamber of the pulverized coal fired boiler ignition oil gun of the present invention.

Fig. 6 is a sectional view of the two-phase flow generator of the ignition oil gun of the pulverized coal fired boiler of the present invention.

Fig. 7 is a front view of the two-phase flow generator of the pulverized coal boiler ignition oil gun of the present invention.

Fig. 8 is a sectional view of the two-phase flow mixer of the pulverized coal fired boiler ignition oil gun of the present invention.

Fig. 9 is a front view of the two-phase flow mixer of the pulverized coal boiler ignition oil gun of the present invention.

Fig. 10 is a schematic structural view of a two-phase flow homogenizing chamber of the pulverized coal boiler ignition oil gun of the present invention.

Fig. 11 is a front view of the support ring of the pulverized coal boiler ignition oil gun of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying the present invention are described in detail below with reference to the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Furthermore, the references herein to "one embodiment" or "an embodiment" refer to a particular feature, structure, or characteristic that may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Furthermore, the present invention will be described in detail with reference to the drawings, and in the detailed description of the embodiments of the present invention, for convenience of illustration, the sectional view showing the device structure will not be enlarged partially according to the general scale, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.

Example 1

Referring to fig. 1 and 2, for the first embodiment of the present invention, a pulverized coal fired boiler ignition oil gun is provided, the device includes a gun head 100, a gun body 200 and a gun tail 300, wherein the gun head 100 includes a housing 101, a nozzle head 102 and a two-phase flow homogenizing chamber 103, the nozzle head 102 is disposed at the top end inside the housing 101, the two-phase flow homogenizing chamber 103 is sleeved inside the housing 101, and the front end thereof is connected with the end of the nozzle head 102, the end of the two-phase flow homogenizing chamber 103 is sequentially connected with a two-phase flow mixer 104 and a two-phase flow generator 105; the gun body 200 comprises a nozzle rear seat 201 and an inner sleeve 202, the nozzle rear seat 201 is arranged at the tail end of the gun head 100 and is in matched connection with the two-phase flow homogenizing chamber 103, the inner sleeve 202 is in matched connection with the tail part of the two-phase flow generator 105, and the outer side of the inner sleeve 202 is sleeved with an outer sleeve 203; and the gun tail 300 comprises an elbow 301 and an oil inlet pipe 302, one end of the elbow 301 is communicated with the tail part of the inner sleeve 202, and the oil inlet pipe 302 is arranged at the tail part of the elbow 301.

Wherein, the outer tube 203 is provided with a through hole 203a near the end, and the through hole 203a is connected with an air inlet tube 303. Fuel enters through an inlet pipe 302 and compressed air enters through an inlet pipe 303. The parts of the device are made of stainless steel, and have the properties of corrosion resistance and high temperature resistance.

In the using process, fuel enters from the fuel inlet pipe 302, sequentially passes through the elbow 301 and the inner sleeve 202, and enters the gun head 100 through the two-phase flow generator 105; the compressed air flows to the gun head through an annular flow passage formed by the air inlet pipe 303, the outer sleeve 203 and the inner sleeve 202.

Example 2

Referring to fig. 1 to 9, a second embodiment of the present invention is different from the first embodiment in that: the nozzle head 102 is in a forward convex frustum shape, a plurality of two-phase flow nozzles 102a are arranged on the conical surface along the circumferential direction, a plurality of two-phase flow nozzles 102a are also arranged on the forward convex table surface, and a plurality of secondary air channels 102b and small nozzles 102c are arranged on the outer edge of the conical surface. The two-phase flow generator 105 is bowl-shaped, a plurality of oil inlet holes 105a are formed in the middle of the bottom of the two-phase flow generator, a plurality of air inlet holes 105b are formed in the circumferential side wall of each oil inlet hole 105a, and the oil inlet holes 105a and the air inlet holes 105b are distributed at an angle of approximately 90 degrees.

Compared with the embodiment 1, further, the outer side of the tail end of the two-phase flow homogenizing chamber 103 is provided with a first external thread 103a, the inner wall of the front end of the spray head rear seat 201 is provided with an internal thread 201a, and the spray head rear seat 201 is connected with the two-phase flow homogenizing chamber 103 in a matching manner through the internal thread 201a and the first external thread 103 a; a plurality of groups of axial vent holes 103b are arranged between the tubular outer wall of the two-phase flow homogenizing chamber 103 and the external thread 103a along the circumferential direction.

Furthermore, a red copper gasket 106 is arranged outside the connection part of the two-phase flow homogenizing chamber 103 and the spray head rear seat 201, and a red copper gasket 204 is arranged at the connection part of the inner sleeve 202 and the two-phase flow generator 105.

The rest of the structure is the same as that of embodiment 1.

The connection between the two-phase flow homogenizing chamber 103 and the nozzle back seat 201 is firmer by the red copper gasket 106, and the connection between the inner sleeve 202 and the two-phase flow generator 105 is firmer by the red copper gasket 204.

Specifically, the number and the flow cross section of the plurality of oil inlet holes 105a of the two-phase flow generator 105 at the middle part of the bowl bottom are calculated according to the output of the oil gun. The two-phase flow spray hole 102a on the conical surface of the spray hole head 102 is swept by transverse secondary airflow, so that nearly 90% of fuel oil can be subjected to superfine atomization; the plurality of spray holes on the small protruded table top can not obtain the transverse blowing of secondary air flow, can not realize superfine atomization, and relatively larger oil drops have forward momentum and can maintain the longer length of oil flame and better flame rigidity.

In the using process, fuel enters the interior of the gun head from a central oil inlet hole 105a at the bowl bottom of the two-phase flow generator 105, and a part of annual compressed air enters a central flow channel of the gun head 100 from a bowl wall circumferential air inlet hole 105b of the two-phase flow generator 105; meanwhile, in the two-phase flow generator 105, a plurality of fine jet flows of fuel oil and compressed air mutually impact to form oil film bubble two-phase flow. The oil film bubble flow passes through a two-phase flow mixer 104 and a two-phase flow homogenizing chamber 103 to form a more uniform micro oil film bubble flow. At the moment when the oil film bubble flow is ejected from the nozzle holes of the nozzle hole head 102, the balance condition of the oil film bubbles is broken, and the bubbles are broken, so that the oil film is crushed and atomized.

Example 3

Referring to fig. 1 to 11, a third embodiment of the present invention is different from the second embodiment in that: the gun body 200 further comprises a support ring 205 and an end cover 206, wherein the support ring 205 is clamped between the inner sleeve 202 and the outer sleeve 203 and connected with the inner sleeve 202 and the outer sleeve 203; the end cap 206 is ring-shaped and is fixedly connected with the tail end of the outer sleeve 203. The outer wall of the tail end of the oil inlet pipe 302 is provided with a second external thread 302a, and the outer wall of the tail end of the air inlet pipe 303 is provided with a third external thread 303a

Compared with the embodiment 2, further, a secondary air channel and a secondary air small nozzle are formed between the two-phase flow generator 105, the two-phase flow mixer 104, the two-phase flow homogenizing chamber 103, the spray orifice head 102 casing 101 and the spray orifice rear seat 201; the two-phase flow mixer 104 is internally provided with a venturi-type tubular flow passage.

Furthermore, the amount of compressed air flowing into the two-phase flow generator 105 is 3% -5% of the fuel mass flow, and the amount of compressed air entering the secondary air flow channel is 7% -9% of the fuel mass flow.

The rest of the structure is the same as that of embodiment 2.

The formed secondary air channel and the secondary air small nozzle can spray high-speed secondary air flow, and under the impact of the high-speed secondary air flow and the shock of supersonic velocity shock waves, the oil film is broken and atomized to be finer. A uniform tiny oil film bubble flow can be formed in a flow channel of the two-phase flow formed in the center axial direction of the gun head, and the oil film is broken and atomized due to the burst of bubbles at the moment when the oil film bubble flow goes out of the spray hole. The way of breaking and atomizing the oil film by bubble bursting overcomes the surface tension of fuel oil and only needs about 0.5Mpa of fuel oil pressure; rather than overcoming the viscosity of fuel oil like mechanical atomization, the pressure of the fuel oil in an oil gun is as high as 2-4 Mpa.

During use, a part of compressed air enters the secondary air flow channel, flows to the secondary air small nozzle, passes through the annular flow channel formed between the interior of the nozzle back seat 201 and the outer walls of the two-phase flow generator 105 and the two-phase flow mixer 104, passes through the connecting channel and the annular flow channel at the periphery of the two-phase flow homogenizing chamber 103, and flows to the secondary air small nozzle outside the spray hole head 102 in the shell 101, and at the moment, the secondary air can generate high-speed jet flow and shock wave to further deepen oil film breaking and atomization. The secondary crushing of transverse airflow or multiple crushing of transverse airflow is very important and obvious in effect, and ultrafine atomized oil drops can be obtained, wherein the Solter average diameter SMD of the oil drops is less than 25 mu m and can reach 15 mu m. In a large number of experimental studies and engineering practices, 30% of fuel oil can be directly gasified in the atomization process of the technology, and the combustion flame temperature of 1800-2000 ℃ can be obtained.

It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.

Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).

It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.

Claims (10)

1. The utility model provides a pulverized coal fired boiler ignition oil gun which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

the lance head (100) comprises a shell (101), a jet orifice head (102) and a two-phase flow homogenizing chamber (103), wherein the jet orifice head (102) is arranged at the top end inside the shell (101), the two-phase flow homogenizing chamber (103) is sleeved inside the shell (101), the front end of the two-phase flow homogenizing chamber is connected with the tail end of the jet orifice head (102), and the tail end of the two-phase flow homogenizing chamber (103) is sequentially connected with a two-phase flow mixer (104) and a two-phase flow generator (105);

the gun body (200) comprises a nozzle rear seat (201) and an inner sleeve (202), the nozzle rear seat (201) is arranged at the tail end of the gun head (100) and is connected with the two-phase flow homogenizing chamber (103) in a matching mode, the inner sleeve (202) is connected with the tail of the two-phase flow generator (105) in a matching mode, and the outer side of the inner sleeve (202) is sleeved with an outer sleeve (203); and (c) a second step of,

guntail (300), including elbow (301) and advance oil pipe (302), the one end of elbow (301) with interior sleeve pipe (202) afterbody is linked together, advance oil pipe (302) set up in the afterbody of elbow (301).

2. The pulverized coal fired boiler ignition oil gun as set forth in claim 1, wherein: the nozzle head (102) is in a forward convex frustum shape, a plurality of two-phase flow nozzles (102a) are arranged on the conical surface along the circumferential direction, a plurality of two-phase flow nozzles (102a) are also arranged on the forward convex table surface, and a plurality of secondary air channels (102b) and small nozzles (102c) are arranged on the outer edge of the conical surface.

3. The pulverized coal fired boiler ignition oil gun as set forth in claim 2, wherein: the two-phase flow generator (105) is bowl-shaped, a plurality of oil inlet holes (105a) are formed in the middle of the bottom of the two-phase flow generator, a plurality of air inlet holes (105b) are formed in the circumferential side wall of each oil inlet hole (105a), and the oil inlet holes (105a) and the air inlet holes (105b) are distributed at an angle of approximately 90 degrees.

4. The pulverized coal fired boiler ignition oil gun according to any one of claims 1 to 3, characterized in that: the outer side of the tail end of the two-phase flow homogenizing chamber (103) is provided with a first external thread (103a), the inner wall of the front end of the spray head rear seat (201) is provided with an internal thread (201a), and the spray head rear seat (201) is connected with the two-phase flow homogenizing chamber (103) in a matched mode through the internal thread (201a) and the first external thread (103 a).

5. The pulverized coal fired boiler ignition oil gun as set forth in claim 4, wherein: and a plurality of groups of axial vent holes (103b) are arranged between the tubular outer wall of the two-phase flow homogenizing chamber (103) and the first external thread (103a) along the circumferential direction.

6. The pulverized coal fired boiler ignition oil gun as set forth in claim 5, wherein: and a red copper gasket (106) is arranged on the outer side of the joint of the two-phase flow homogenizing chamber (103) and the spray head rear seat (201), and a red copper gasket (204) is arranged on the joint of the inner sleeve (202) and the two-phase flow generator (105).

7. The pulverized coal fired boiler ignition oil gun as defined in any one of claims 1 to 3, 5 and 6, wherein: the gun body (200) further comprises a support ring (205) and an end cover (206), wherein the support ring (205) is clamped between the inner sleeve (202) and the outer sleeve (203) and connected with the inner sleeve (202) and the outer sleeve (203);

the end cover (206) is annular and is fixedly connected with the tail end of the outer sleeve (203).

8. The pulverized coal fired boiler ignition oil gun as set forth in claim 7, wherein: a through hole (203a) is formed in the outer sleeve (203) close to the tail end, and the through hole (203a) is connected with an air inlet pipe (303);

the outer wall of the tail end of the oil inlet pipe (302) is provided with a second external thread (302a), and the outer wall of the tail end of the air inlet pipe (303) is provided with a third external thread (303 a).

9. The pulverized coal fired boiler ignition oil gun as set forth in claim 8, wherein: a secondary air flow channel and a secondary air small nozzle are formed between the two-phase flow generator (105), the two-phase flow mixer (104), the two-phase flow homogenizing chamber (103), the spray hole head (102) shell (101) and the spray head rear seat (201);

the two-phase flow mixer (104) is internally provided with a Venturi type tubular flow passage.

10. The pulverized coal fired boiler ignition oil gun as set forth in claim 9, wherein: the amount of compressed air flowing into the two-phase flow generator (105) is 3% -5% of the mass flow of the fuel oil, and the amount of compressed air entering the secondary air flow channel is 7% -9% of the mass flow of the fuel oil.

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