JPS5937533Y2 - Self-cooling liquefied gas burner - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a burner for liquefied gas.

Liquefied gas is usually vaporized and then burned with a burner, but
On an industrial scale, a paper 2izer is required for vaporization,
Equipment costs are higher than regular liquid fuels.

If the liquefied gas is burned in its liquid state, a vaporizer will not be necessary and the amount of equipment will be reduced, but there will be the following problem.

(1) The amount of combustion is adjusted by changing the nozzle back pressure by changing the opening degree of the flow control valve installed in the liquid supply conduit, but if this back pressure falls below the saturation pressure of the liquid, some of the liquid evaporates and flows through the pipe as a gas-liquid two-phase flow, which fluctuates the pressure inside the pipe, and the gas and liquid are separated and ejected at the nozzle, resulting in wide fluctuations in the flow rate, making it difficult to adjust the flow rate. It becomes difficult.

(2) If the pressure inside the conduit is kept above the saturation pressure of the liquid, the problem mentioned above will be solved, but in this case, even at the minimum liquid flow rate, it is necessary to maintain the pressure above the saturation pressure of the liquid, and therefore the burner When considering turndown, extremely high pressure is required at maximum liquid flow rate.

For example, butane liquid at 30℃ (saturation pressure 2 Kg/crrt
G) is adjusted in the range of 100 to 20%, the pressure at the maximum liquid flow rate is 50 Kf/ from the relationship of flow rate cc/10,000.
More than crrlG is required.

Therefore, equipment costs and operating costs increase, and safety also decreases.

The present invention is intended to solve the above problems, and one embodiment thereof will be described below with reference to the drawings.

In the figure, the burner has a double tube structure consisting of an inner tube 1 and an outer tube 2, and the tip of the inner tube 1 communicates with a burner nozzle 3.
The tip of the outer tube 2 has a plurality of flow passages 4 having a diameter smaller than that of the inner tube 1.
It communicates with the burner nozzle 3 through.

A liquid supply port 5 is provided in the outer tube 2 and connected to a tank 8 via a flow rate control valve 6 and a pressure booster pump 7.

The inner tube 1 is also provided with one or several small holes 9, through which a portion of the liquefied gas supplied to the burner is introduced into the inner tube 1.

The pressure of the liquefied gas is increased by the pressure booster pump 7, and the liquefied gas is supplied to the outer tube 2 from the liquid supply port 5 through the flow rate control valve 6.

The combustion amount of the burner is controlled by adjusting the supply pressure to the outer tube 2 by the flow rate control valve 6.

At this time, when the supply pressure to the outer tube 2 is reduced to below the saturation pressure of this liquid by the flow rate control valve 6, a gas-liquid two-phase flow occurs in the conduit to the outer tube 2 after the flow rate control valve 6, and as it is, the burner nozzle 3 If the fuel is blown out and burned, the above-mentioned problems will occur.

However, since the inner tube 1 is provided with a small hole 9, the outer tube 2
A part of the liquid supplied to the inner tube 1 is introduced into the inner tube 1 through the small hole 9, where it is evaporated under reduced pressure.

At this time, since the latent heat of vaporization is obtained from the liquefied gas in the outer tube 2, the temperature of the liquid in the outer tube 2 is easily lowered, and the saturated pressure of the liquefied gas is lowered to near atmospheric pressure.

Therefore, it becomes possible to lower the pressure to a low level using the flow rate control valve 6, and the flow rate can be adjusted over a wide range.

The vaporized gas that has been evaporated under reduced pressure is ejected from the inner tube 1 to the combustion section and is combusted, which itself functions as a pilot burner and contributes to stabilizing the flame.

Note that in order to increase the effect of cooling the liquid in the outer tube 2 by evaporation, a combination of known structures may be used, such as using a fin tube for the inner tube 1, for example.

Further, although the pressure booster pump 7 is used in this embodiment, this is not necessarily necessary, and it can also be applied to a method of spray combustion using the saturation pressure of liquefied gas.

As described above, according to the present invention, since the liquid temperature in the outer tube can be lowered, the saturation pressure of the supplied liquefied gas can be lowered to near atmospheric pressure, and therefore the flow rate can be adjusted over a wide range with low pressure. becomes possible and achieves the purpose.

Moreover, the vaporized gas evaporated under reduced pressure in the inner tube is ejected from the inner tube to the combustion section and combusted, thereby contributing to the stabilization of the flame.

[Brief explanation of the drawing]

The drawing is a configuration diagram showing an embodiment of the present invention. 1...Inner pipe, 2...Outer pipe, 4...
...Flow path, 5...Liquid supply port, 6...
Flow control valve, 8...Tanku 9...Small hole.

Claims (1)

[Scope of utility model registration request] In a liquefied gas burner that sprays and burns liquefied gas in liquid form from a burner nozzle, the burner structure is composed of a double tube consisting of an inner tube and an outer tube, the tip of the inner tube is connected to the burner nozzle, and the outer tube is connected to the diameter of the inner tube. communicating with the burner nozzle through a plurality of smaller diameter flow passages, and providing a liquefied gas supply port in the outer tube;
A self-cooling type burner for liquefied gas, characterized in that one or several small holes are provided in the inner tube to communicate the inner tube and the outer tube.