JPS62252810A - Burner for liquid fuel - Google Patents

Abstract

PURPOSE:To reduce the steam consumption as well as the evolving quantity of nitrogen oxide and simplify the cutting work of the titled burner by a method wherein liquid fuel is supplied to an injection port while whirling it and spray medium is supplied to the injection port without whirling it. CONSTITUTION:A burner tip 22 is provided with a circular recess 30 at the central section thereof and a circular groove 31 at the outer peripheral part thereof while a plurality of injection holes 32 are bored between the circular groove 31 and the recess 30. One side wall (b) of communicating grooves 33, 35 between the bottom surface of the injection hole 32 and the recess 30 as well as the groove 31 pass substantially through the center of the injection hole 32 while the other side walls (c), (d) are parallel to the one side wall (b) and are positioned tangentially to the injection holes 32. According to this constitution, liquid fuel passes through the injection holes 32 while being whirled and is atomized by the expansion energy of steam injected from the lower surface of the injection holes 32 whereby the liquid fuel is diffused uniformly. Only the liquid fuel is whirled and spray medium is not whirled, therefore, the steam consumption is reduced, the heating temperature of the liquid fuel need not be increased, the generation of nitrogen oxide may be reduced and the cutting work of the titled burner may be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid combustion burner used in boilers, heating furnaces, melting furnaces, etc.

[Conventional technology]

Conventionally, liquid combustion burners that mix a spray medium with liquid fuel and spray it from multiple injection holes have atomized the fuel by the expansion energy when the spray medium, steam or air, is injected from the high-pressure side to the low-pressure side. We are trying to spread the word. However, since the liquid fuel is an incompressible fluid and the fuel itself has almost no dispersion force, there is a problem in that the spray medium must be maintained at high temperature and pressure. In order to solve this problem, a proposal was made in 1977 to give the liquid fuel a swirling motion and use centrifugal force to further diffuse and atomize the fuel, thereby improving the combustion state.
It is shown in the publication No.-145116.

This will be explained with reference to FIGS. 9 to 11. The burner I is composed of a burner tube 2, a supply plate 3, and a supply pipe 5.

A circular recess 6 is formed in the center of the bottom surface of the burner chip 2, and circular grooves 7 are formed at intervals around the outer periphery of the circular recess 6.
is formed. A plurality of injection holes 9 that open on the upper surface of the burner chip 2 are provided between the circular recesses 6 and the circular groove 7, and a communication groove is provided between the plurality of injection holes 9 and the circular recess 6. 10 is formed, and a communication groove 11 is formed between each injection hole 9 and the circular groove 7.

Each communication groove 10.11 is formed so that it can be turned in the same direction within each injection hole 9 when the spray medium and liquid fuel flow into each injection hole 9. In the communication groove 10, grooves 10a and 10d communicating with the circular recess 6 extend radially from the circular recess 6, and a branch groove 10b, an IOC, and a branch groove 1, respectively.
The branch grooves 10b, 10c and the branch grooves 10e, 10r are tangentially connected to the adjacent injection hole 9.

As shown in FIG. 10, the supply plate 3 is formed with holes 12, 13 that communicate with the circular recess 6 and the circular groove 7 formed on the bottom surface of the burner chip 2. Further, the supply pipe 5 is formed with a liquid fuel supply pipe 15 and an atomizing medium supply pipe 16, which communicate with the holes 12 and 13 of the supply plate, respectively.

To explain the operation of the burner with the above configuration,
When liquid fuel and a spray medium such as steam are supplied to the liquid fuel supply pipe 15 and the spray medium supply pipe 16, respectively, the liquid fuel passes through the hole 12 of the supply plate to the burner chip 2.
It is supplied to the circular recess 6 of the groove 10a and the branch groove 10.
Route b, groove 10d, route of branch groove Lot, or groove I
It is supplied to the bottom end of each injection hole 9 through Qa, the path of the branch groove 10c, and $10d, the path of the branch groove 10e. On the other hand, steam is supplied to the circular groove 7 from the hole 13 in the supply plate, and further supplied to the bottom end of each injection hole 9 via the communication groove 11.

Since the branch grooves tob and 10f and the communication groove 11 as well as the branch grooves 10c and 10d and the communication groove 11 are communicated with each injection hole 9 in the tangential direction, the liquid fuel and vapor are injected from the injection hole 9 while being swirled. be done. Therefore, not only the expansion energy of the vapor but also the swirling motion promotes mixing of the liquid fuel with the air and atomization.
It is uniformly diffused over a wide area.

[Problem that the invention seeks to solve]

In the above-mentioned conventional burner, since the atomizing medium such as steam is swirled, the frictional energy between the steam and the liquid fuel increases, resulting in an increase in steam consumption. Since the temperature must be increased, there is a problem in that the generation of nitrogen oxides increases.

Furthermore, since many and complicated communication grooves are formed on the bottom surface of the burner chip, the cutting process becomes complicated and the cost increases.

The present invention solves the above problems, and aims to provide a liquid combustion burner that reduces steam consumption, reduces the generation of nitrogen oxides, and is easy to cut.

[Means for solving problems]

For this purpose, the liquid combustion burner of the present invention includes a fuel supply body having a liquid fuel supply hole and an atomization medium supply hole, and a plurality of fuel supply bodies fitted into the fuel supply body and communicating with the liquid fuel supply hole and the atomization medium supply hole. In a burner for liquid combustion, the burner chip is provided with a circular recess at the center of the bottom surface and a circular groove at the outer periphery of the bottom surface, and these circular recesses and circular grooves are used for the injection holes. A communication groove communicating with the hole is provided, one side wall of the communication groove is formed to pass approximately through the center of the injection hole,
The other side wall is formed to be parallel to the one side wall and located in the tangential direction of the injection hole, and the fuel supply body has a branch that communicates the liquid fuel supply hole with the circular recess and the circular groove. The present invention is characterized in that a hole is provided so that the liquid fuel is supplied to the injection hole while swirling, and the spray medium is supplied to the injection hole without swirling.

[Effect]

According to the present invention, the expansion energy of the vapor and the swirling motion of the liquid fuel promote the mixing of the liquid fuel with air and the atomization of the liquid fuel, which not only spreads uniformly over a wide area, but also
Since only the liquid fuel is swirled and the spray medium such as steam is not swirled, the frictional energy between the vapor and the liquid fuel is reduced, and the amount of steam consumed is reduced.

〔Example〕

Examples will be described below with reference to the drawings.

FIG. 1 is a sectional view showing one embodiment of the liquid combustion burner of the present invention, FIG. 2 is a plan view of the fuel supply body in FIG. 1,
FIG. 3 is a sectional view of the burner chip in FIG. 1; FIG. 4 is a bottom view of FIG. 3; FIG. 5 is a sectional view showing another embodiment of the liquid combustion burner of the present invention; and FIG. Fig. f55 is a plan view of the fuel supply body, Fig. 7 is a sectional view showing still another embodiment of the liquid combustion burner of the present invention, and Fig. 8 is a plan view of the fuel supply body in Fig. 7.

In the figure, 20 is a liquid combustion burner, 21 is a fuel supply body,
22 is a burner chip, 23 is a liquid fuel supply hole, 25 is a branch hole, 26 is a spray medium supply hole, 27 is a small diameter hole, 28 is an engagement pin, 29 is a fitting part, 30 is a circular recess, and 31 is a circular groove. , 32 is an injection hole, 33.35 is a communication groove, and 36 is an engagement hole.

In FIG. 1, a liquid combustion burner 20 is composed of a fuel supply body 21 and a burner chip 22 coupled to the upper surface of the fuel supply body 21. As shown in FIG. The fuel supply body 21 has a cylindrical shape with a conical upper surface, and a liquid fuel supply hole 23 is formed in the center thereof so as to pass through the liquid fuel supply hole 2.
A plurality of branch holes 25 are formed diagonally upward from the bottom of 3.
Further, a plurality of spray medium supply holes 26 are formed obliquely upward from the bottom peripheral portion of the liquid fuel supply hole 23 . The atomizing medium supply hole 26 is penetrated by a small diameter hole 27 bored perpendicularly to the upper surface of the fuel supply body 21, and as shown in FIG. It is formed so that it is arranged. Further, a retaining pin 28 is driven into the upper surface of the fuel supply body 21 for engaging a burner chip.

On the other hand, as shown in FIGS. 3 and 4, the burner chip 22 has a fitting part 29 on the bottom surface that fits with the fuel supply body 21, and has a generally conical shape as a whole, with a circular recess in the center. 30 is formed, and a circular groove 31 is formed on the outer periphery.
is formed, and a plurality of injection holes 32 are drilled between the circular groove portion 31 and the circular recess portion 30. Communication grooves 33 and 35 are formed between the bottom surface of the injection hole 32 and the circular curved portion 30 and the circular groove portion 31, respectively.
One side wall a, b of these communication grooves 33 and 35 is formed to pass approximately through the center of the injection hole 32, and the other side wall c, d is parallel to one side wall a, b, and is formed to pass approximately through the center of the injection hole 32. It is formed to be located in the tangential direction. Furthermore, an engagement hole 36 that engages with the engagement pin 28 is provided in the outer peripheral portion of the burner chip 22 .

To explain the operation of the liquid combustion burner having the above configuration, the liquid fuel supplied to the fuel supply body 21 is branched into the liquid fuel supply hole 23 and the branch hole 25, and one liquid fuel is supplied to the liquid fuel supply hole 23. , is injected from the side surface of the injection hole 32 through the circular recess 30 and the communication groove 33 of the burner chip 22.

The other liquid fuel passes through the branch hole 25, the circular groove 31 of the burner chip 22, and the communication groove 35, and then enters the injection hole 32.
is sprayed from the side. On the other hand, a spray medium such as steam is injected from the bottom of the injection hole 32 through the spray medium supply hole 26 and the small diameter hole 27 .

At this time, one side wall a, b of the communication grooves 33 and 35 is
The liquid fuel is formed to pass approximately through the center of the injection hole 32, and the other side walls c and d are parallel to one of the side walls a and b and are located in the tangential direction of the injection hole 32. After flowing in from the opposite sides of the injection hole 32, the steam passes through the injection hole 32 while swirling, and further, as steam is injected from the lower surface of the injection hole 32, the liquid fuel is atomized by its expansion energy. At the same time, it is uniformly diffused.

Next, another embodiment of the present invention will be described with reference to FIGS. 5 and 6. The differences compared to the above embodiments are as follows:
This is because the liquid fuel supply hole 23 and the spray medium supply hole 26 in the fuel supply body 21 are located oppositely. That is,
A spray medium supply hole 2G is formed in the center of the bottom surface of the fuel supply body 21, a plurality of small diameter holes 27 are formed to communicate the spray medium supply hole 26 and the injection hole 32, and around the spray medium supply hole 26, A plurality of liquid fuel supply holes 23 are drilled, and each liquid fuel supply hole 23 has a circular recess 3 of the burner chip 22.
0 and the first branch hole 37 communicating with the burner chip 22
A second branch hole 39 communicating with the circular groove 31 is formed.

To explain its operation, the liquid fuel supplied to the fuel supply body 21 is branched from the liquid fuel supply hole 23 to the first branch hole 37 and the second branch hole 39, and one liquid fuel is divided into the first branch hole 37 and the second branch hole 39. The fuel is injected from the side surface of the injection hole 32, hitting the branch hole 37, the circular recess 30 of the burner chip 22, and the communication groove 33. Further, the other liquid fuel is transferred to the second branch hole 39
, the circular groove portion 31 and the communication groove 35 of the burner tip 22
It is injected from the side of the injection hole 32 through the . On the other hand, the spray medium such as steam is injected through the spray medium supply hole 26 and the small diameter hole 27 onto the bottom surface of the injection hole 32 without being swirled.

Next, still another embodiment of the present invention will be described with reference to FIGS. 7 and 8. The difference from the embodiment shown in FIG. 1 is that in the embodiment shown in FIG.
3 and 35 are formed on the burner chip 22 side, but in this embodiment, the communication grooves 33 and 35 are formed on the fuel supply body 21 side. Therefore, the fuel supply body 2
1, the communication grooves 33 and 35 can be cut into the upper surface of the plate 1, making the cutting process easier.

It should be noted that the present invention is not limited to the embodiments described above, and it goes without saying that various modifications are possible.For example, in each of the embodiments described above, five injection holes 32 are provided.
It is also possible to have four or three injection holes. In this way, flame interference is eliminated and a good combustion condition can be obtained, and cutting becomes easier.

〔Effect of the invention〕

As explained above, according to the present invention, the expansion energy of vapor and the swirling motion of liquid fuel promote the mixing of liquid fuel with air and atomization, which not only spreads uniformly over a wide area, but also Since only the liquid fuel is swirled and the spray medium such as steam is not swirled, the frictional energy between the vapor and the liquid fuel is reduced, reducing the amount of steam consumed and eliminating the need to increase the heating temperature of the liquid fuel. Therefore, the generation of nitrogen oxides can also be reduced. Furthermore, cutting can be simplified and costs can be reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the liquid combustion burner of the present invention, FIG. 2 is a plan view of the fuel supply body in FIG. 1,
34 is a bottom view of the burner chip in FIG. 1, FIG. 5 is a sectional view showing another embodiment of the burner for liquid combustion of the present invention, and FIG. 7 is a sectional view showing still another embodiment of the liquid combustion burner of the present invention; FIG. 8 is a plan view of the fuel supply body in FIG. 7; FIG. 9; FIG. 10 and FIG. 11 are diagrams showing a conventional liquid combustion burner. 20... Liquid combustion burner, 21... Fuel supply body, 22... Burner chip, 23... Liquid fuel supply hole, 25... Branch hole, 26... Spray medium supply hole, 2
7... Small diameter hole, 29... Fitting portion, 30... Circular recess, 31... Circular groove, 32... Injection hole, 33.3
5...Communication groove. Bury the squares in the weir. Nefu official text (method) % formula % 1. Indication of the case 1985 Patent side No. 9 s 76
6゛岑、base 2、Name of the invention Burner for liquid combustion 3、Relationship with the case of the person making the amendment Patent applicant's address 2-5-8-704 Iwamoto-cho, Chiyoda-ku, Tokyo Name I, Pi, Varnish Engineering Co., Ltd. 4, Agent Address: 3-17-9-5 Ueno, Taito-ku, Tokyo, Date of Amendment Order: June 4, 1986 (Shipping Port: June 24, 1986) 6. Increase due to amendment Number of inventions: None 7, Subject of amendment: Inventor column, Applicant column, Drawing No. 8, Contents of amendment (2) Amend Drawing No. 7 as shown in the attached sheet. (3) Proof of power of attorney 9. List of attached documents (1) 1 copy of a certified copy of the register (2) 1 copy of a statement of reasons

Claims (3)

[Claims] (1) A fuel supply body having a liquid fuel supply hole and an atomizing medium supply hole, and a burner chip having a plurality of injection holes fitted into the fuel supply body and communicating with the liquid fuel supply hole and the atomizing medium supply hole; In the burner chip, the burner chip is provided with a circular recess at the center of the bottom surface, a circular groove at the outer periphery of the bottom, and a communication groove that communicates the circular recess and the circular groove with the injection hole. , one side wall of the communication groove is formed to pass approximately through the center of the injection hole, and the other side wall is formed parallel to the one side wall and located in the tangential direction of the injection hole, while the fuel The supply body is provided with a branch hole that communicates the liquid fuel supply hole with the circular recess and the circular groove, and supplies the liquid fuel to the injection hole while swirling it, and supplies the spray medium to the injection hole without swirling it. A liquid combustion burner characterized in that it is configured to. (2) The liquid combustion burner according to claim 1, wherein the communication groove is provided on the burner chip side. (3) The liquid combustion burner according to claim 1, wherein the communication groove is provided on the fuel supply body side.