JPH0758123B2 - Liquefied petroleum gas burner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner for spraying and burning liquefied petroleum gas as a liquid.

[0002]

2. Description of the Related Art In a burner for liquid combustion, when the burner is extinguished or misfired, the fuel that remains between the cutoff portion of the feed line and the nozzle is in the liquid phase, so that the residual liquid remains in the preheated furnace. There is a danger of explosive combustion due to rapid vaporization.

As a method of quickly preventing the fuel liquid from flowing out of the nozzle, a shut-off valve is provided in the cavity of the nozzle, which is a needle valve for controlling the flow rate of the liquid by entering and exiting the liquid spray hole of the end wall of the cavity. However, in the operation as a shutoff valve, the outer peripheral surface of the tip end portion of the needle valve is tightened to the inner wall surface of the liquid spray hole,
There is a problem that the flow control characteristic of the needle valve changes due to aging.

In the burner for liquid combustion disclosed in Japanese Patent Publication No. 1-15766, a shut-off valve is provided in the liquid fuel feed line, and the shut-off valve is closed in an emergency such as burner extinction or misfire. The residual liquid between the burner and the shutoff valve is rapidly sucked and discharged through a ejector with a driving gas such as a dry inert gas. However, this burner requires a storage container for the driving gas, a supply line, and an on-off valve in addition to the purge line used for extracting the fuel liquid and the introduction line to the vent stack and the flare stack, which reduces the equipment cost. Operating costs have increased.

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to prevent residual liquid from flowing into the furnace quickly and accurately by a shut-off valve provided separately from the needle valve in the cavity of the nozzle, so that the driving can be performed. A burner for liquefied petroleum gas that does not require the use of gas.

[0006]

A liquid spray hole 5 is provided in an end face wall 4 of a hollow portion 3 of a nozzle 2 in a liquefied petroleum gas burner 1 of the present invention. A shutoff valve 7 is provided inside the hollow portion 3 of the nozzle 2 for controlling the liquid flow rate by moving in and out of the liquid spray hole 5, and shutting off the flow of the liquid to the liquid spray hole 5 outside the needle valve 6. To provide.

[0007]

The fuel liquid supplied from the liquefied petroleum gas storage tank 8 to the burner 1 through the feed pipe 9 flows into the cavity 3 of the nozzle 2, and the liquid spray hole 5 of the nozzle 2 causes the burner 1 to flow.
Is ejected to the flame forming unit 10 and is ignited and burned.

At the time of extinguishing the burner 1 or in case of an emergency such as misfire, a control signal from the controller 11 is sent to the drive unit 12 of the solenoid valve type shutoff valve 7, which shuts the inner surface of the end wall 4 of the nozzle 2. Immediately sits on and shuts off the flow of fuel liquid to the liquid spray hole 5. Therefore, the liquid does not leak into the furnace in the residual heat state.

The control signal from the controller 11 is also sent to the drive section 14 of the solenoid valve 13 in the feed line at the same time.
The fuel liquid is confined in the section between the solenoid valve 13 and the shutoff valve 7 by closing the valve. Residual liquid in this section is
The control signal from the control valve 1 is sent to the drive unit 17 of the solenoid valve 16 of the purge line 15, and the solenoid valve 16 is opened to be discharged to the vent stack or flare stack 18 for combustion processing or the like.

[0010]

In the embodiment shown in FIG. 1, the valve body of the shut-off valve 7 which linearly moves in the axial direction of the nozzle 2 is composed of a cylindrical body coaxially arranged with the needle valve 6, and the front end outer flange portion is made of Teflon. An annular sheet member 19 made of a heat resistant material such as is embedded. An O-ring made of a similar material is inserted between the needle valve 6 and the shutoff valve 7.

[0011]

As described above, in the liquefied petroleum gas burner of the present invention, the liquid spray hole 5 is provided in the end wall 4 of the hollow portion 3 of the nozzle 2, and the liquid spray hole 5 is moved in and out to control the liquid flow rate. Since the needle valve 6 is provided in the hollow portion 3 of the nozzle 2 and the shutoff valve 7 that shuts off the flow of the liquid to the liquid spray hole 5 is provided outside the needle valve 6, the residual liquid quickly flows into the furnace. In addition, the risk of explosive combustion can be completely avoided because it can be accurately prevented, and since the driving gas is not used, the facility cost and the operating cost can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a nozzle portion of a liquefied petroleum gas burner according to an embodiment of the present invention.

FIG. 2 is a schematic view of the entire burner for liquefied petroleum gas.

[Explanation of symbols]

 1 Burner 2 Nozzle 3 Nozzle Cavity 4 End Face Wall 5 Liquid Spray Hole 6 Needle Valve 7 Shutoff Valve 8 Liquefied Petroleum Gas Storage Tank 9 Feeding Pipeline 10 Burner Flame Forming Section 11 Control Section 12 Shutoff Valve Drive Section 13 Solenoid valve of feed pipe 14 Solenoid valve drive unit 15 Purge pipe line 16 Purge pipe line solenoid valve 17 Electromagnetic valve drive unit 18 Flare stack 19 Annular seat member

Claims (1)

[Claims] 1. A liquid spray hole is provided in an end wall of a hollow portion of a nozzle, and a needle valve for controlling the liquid flow rate by moving in and out of the liquid spray hole is provided in the hollow portion of the nozzle, and the liquid spray is provided outside the needle valve. A liquefied petroleum gas burner equipped with a shutoff valve that shuts off the flow of liquid to the holes.