WO2019117467A1 - Lpg direct injection combustion device - Google Patents

Abstract

The present invention relates to an LPG direct injection combustion device comprising a direct jet burner connected to an LPG storage tank through a connection pipe. The direct injection burner comprises: an injection nozzle having a nozzle hole formed at a tip thereof to receive a supply of liquid LPG from the connection pipe and inject the same to the outside; and a nozzle rod which moves back and forth in the injection nozzle to thereby open and close the nozzle hole of the injection nozzle, wherein the nozzle rod moves backward in a direction opposite to the injection direction of the injection nozzle in a state where the tip of the nozzle rod blocks the nozzle hole of the injection nozzle, thereby opening the nozzle hole.

Description

LPG Direct Injection Combustion Device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LPG direct injection and combustion apparatus, and more particularly, to an LPG direct injection and combustion apparatus in which liquefied gas such as LPG is directly injected to perform combustion.

Generally, LPG is mainly composed of propane gas (liquefied propane gas). It is sprayed with crude oil in oil field when oil is mined. It is liquefied when pressure is applied at minus 42 ℃ or room temperature at about 7 ~ 10 atm It is a kind of fuel having.

In addition, LPG is easily liquefied and vaporized, its volume becomes small when the gas is converted to liquid, and when it is liquefied at room temperature (15 ° C), its volume is reduced to 1/260 ~ 1/230.

These LPGs are widely used for automobile fuel, portable burner fuel, heating of cooking and large buildings, and industrial fuel of industry.

1 is a schematic view of a conventional LPG gas injection and combustion apparatus. 1, the LPG is stored in a liquid state in the storage tank 1, and the LPG is transferred to the vaporizer 3 through the connection pipe 2, converted into gas through the vaporizer, 5, and then supplied to the combustion device or the burner 7 through the gas flow meter 6 to burn the gas.

Since the conventional LPG-based combustion apparatus is of the gas-fired type, it is essential to install the vaporizer 3 and the pressure regulators 4 and 5. The use of the vaporizer 3 causes the following problems.

a. If the inside of the vaporizer 3 is corroded, there is a risk of gas leakage (corresponding to the case of vaporizing and heating the liquid in a state where the inside of the vaporizer is filled with liquid).

b. When the electricity supplied to the carburetor 3 is cut off, the supply of the LPG is stopped (when the carburetor is shut off, the carburetor is stopped for safety and the LPG can not be used during the recovery).

c. The following maintenance cost occurs when the vaporizer 3 is used.

① Electricity charge: It requires a lot of electricity because the liquid is heated by electricity and the LPG is heated by heating it.

② Periodic inspection fee: It is applicable to inspection of specific facilities and safety construction inspection items, and regular inspection fees, etc. are additionally incurred.

d. When the vaporizer (3) is installed, it occupies a large area according to its capacity, and since all electric equipments using electricity are required to be installed in accordance with the specification of explosion proof performance, the facility cost is large.

e. The volume of the LPG vaporized through the vaporizer 3 is expanded about 250 times, and in order to transport the LPG, the pipe diameter of the gas piping must be increased, resulting in an increase in the piping construction cost.

f. The vaporized LPG has a low density per unit area, which raises the temperature of a certain space to a high temperature, which is inefficient compared to a fuel having a high density (liquid combustion).

g. The vaporized LPG must use the pressure regulator (4, 5) to lower the pressure below 2 atmospheres. (When the pressure inside the piping is more than 2 atmospheres, no re-liquefaction occurs in the piping).

[Prior Art Literature]

Patent Document 1: Korean Patent Laid-Open Publication No. 2003-0008508 (published on Jan. 29, 2003)

Patent Document 2: Korean Patent Registration No. 0840535 (registered on June 17, 2008)

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in an effort to solve the above problems, and an object of the present invention is to provide an LPG And an object thereof is to provide a direct injection combustion device.

In addition, the present invention minimizes use problems due to the failure of the vaporizer and the pressure regulator by burning the liquid LPG without installing the vaporizer and the pressure regulator, reduces the electricity rate, and reduces the maintenance cost and construction cost of the facility It is another object of the present invention to provide a direct injection LPG combustion apparatus capable of reducing the amount of fuel to be injected.

According to an aspect of the present invention, there is provided an LPG direct injection burner including an LPG storage tank and a direct injection burner connected to the LPG storage tank through a connection pipe, An injection nozzle having a nozzle hole formed at a tip thereof to supply liquid LPG to the outside through a connection pipe; And a nozzle rod which opens and closes the nozzle hole of the injection nozzle so as to move forward and backward in the injection nozzle, wherein a state in which the tip of the nozzle rod blocks the nozzle hole of the injection nozzle, And the nozzle hole is opened by moving backward in a direction opposite to the jetting direction.

The tip of the nozzle rod may be conical, and the tip of the nozzle rod may not be exposed to the outside of the nozzle hole with the nozzle hole being open.

Wherein the injection nozzle has an air supply pipe for cooling the nozzle for supplying cooling air for cooling the LPG supply pipe and the injection nozzle disposed outside the LPG supply pipe through the connection pipe and the LPG supply pipe, And a combustion air supply pipe disposed outside the cooling air supply pipe for supplying combustion air to the injection direction side of the injection nozzle.

A submerged pump installed in the LPG storage tank for supplying LPG to the direct injection burner and an inverter for controlling the driving of the submerged pump to maintain the pressure in the pipes communicating with the connection pipe and the connection pipe constant As shown in Fig.

A branch pipe installed between the LPG storage tank and the connection pipe, and a bypass relief valve installed in the branch pipe.

The LPG supply pipe includes a fuel supply device center portion having a supply hole through which liquid LPG is supplied and a discharge hole through which the fluid supplied from the supply hole is discharged, and a flow rate control rod connected to the discharge hole at the center of the fuel control device And the flow rate regulating member may be connected to the injection nozzle.

According to the present invention, there is provided a direct injection burner including a direct injection nozzle, an air supply unit for nozzle cooling, and a combustion air supply unit to supply and burn LPG in liquid state through a connection pipe to an LPG storage tank, The LPG in the liquid phase filled in the combustion chamber can be directly burned by the injection burner to obtain the high-temperature thermal power.

According to the present invention, by directly supplying LPG from the LPG storage tank directly to the injection burner, the LPG can be burned without installing the carburetor and the pressure regulator, thereby minimizing the use problem due to the conventional vaporizer failure, lowering the electricity consumption rate, The diameter of the pipe can be reduced, thereby reducing the construction cost.

1 is a schematic view showing a conventional LPG gas injection and combustion apparatus,

FIG. 2 is a configuration diagram showing an LPG direct injection and combustion apparatus according to an embodiment of the present invention;

3 is a view showing a direct injection burner of an LPG direct injection firing apparatus according to an embodiment of the present invention;

4 is a side view of a direct injection burner of an LPG direct injection firing apparatus according to an embodiment of the present invention, and

5A and 5B are state diagrams showing the operating states of direct injection burners of an LPG direct injection firing apparatus according to another embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concept of the term appropriately in order to describe its own invention in the best way. The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. Further, unless otherwise defined in the technical terms and the scientific terms used, those having ordinary skill in the art to which the present invention belongs have the same meaning as commonly understood. In the following description and the accompanying drawings, descriptions of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted. The accompanying drawings are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms. In addition, like reference numerals designate like elements throughout the specification. It is to be noted that the same elements among the drawings are denoted by the same reference numerals whenever possible.

≪ Embodiment 1 >

2 to 4, an LPG direct injection firing apparatus 100 according to the first embodiment of the present invention includes an LPG storage tank 10 and a connection pipe 11 connected to the LPG storage tank 10 And a direct injection burner 20 for supplying and burning LPG in a liquid state.

In the above configuration, the direct injection burner 20 includes an LPG supply pipe 21, a nozzle rod 22, a nozzle cooling air supply pipe 23, and a combustion air supply pipe 24.

The LPG supply pipe 21 is connected to the connection pipe 11 and serves as a passage through which liquid LPG is supplied. At this time, an injection nozzle 21c having a nozzle hole 21ca formed at an end of the LPG supply pipe 21 is connected.

In FIG. 3, the center 21a of the fuel regulating device is connected to the end of the flow rate regulator 21b. In the upper part, a supply hole 21aa for supplying the LPG liquid is formed. And a discharge hole 21ab through which fluid is discharged is formed.

An LPG leakage preventing cover 25 is provided on the opposite side of the exhaust hole 21ab formed in the center 21a of the fuel adjusting device. The nozzle rod 22 is coupled to the center of the LPG leakage preventing cover 25. At this time, the flow rate regulator 21b is connected to the exhaust hole 21ab of the fuel regulator central portion 21a. Further, the injection nozzle 21c is connected to the flow rate adjuster 21b, and a nozzle hole 21ca is formed at an end thereof.

At this time, the nozzle hole 21ca of the injection nozzle 21c is machined into a circular hole and the end of the nozzle rod 22 is machined into a conical shape so that when the injection nozzle 21c is opened, The tip of the nozzle rod 22 is not exposed to the outside of the injection nozzle 21c so that the occurrence of the icing phenomenon due to the natural vaporization heat of the LPG is suppressed as much as possible.

In addition, the minute ice formed at the end of the spray nozzle 21c during use can be thawed by the radiant heat generated when the spray burner 20 is directly burned.

The ejection area of the nozzle hole 21ca can be changed by forward and backward movement of the nozzle rod 22 by the flow rate adjusting knob 26 coupled to the opposite side of the nozzle hole 21ca of the LPG supply pipe 21. [

2, a submerged pump 30 is installed inside the LPG storage tank 10 to keep the pressure in the piping above the LPG vapor pressure. This is because the pressure in the piping is higher than the steam pressure (7.4 kg / cm < ² >), it is possible to prevent unstable jetting when bubbles (vapor lock phenomenon) occur in the pipe.

If an inverter is installed in the submerged pump 30 and the pressure of the injection nozzle 21c is lower than the set pressure, the submerged pump 30 pressurizes the submerged pump 30 to increase the pressure. So that the pressure reaching the injection nozzle 21c is kept constant.

In addition, the check valve 12 is provided in the connection pipe 11 so that the liquid LPG can be directly conveyed to the injection burner 20 side but can not be transferred to the LPG storage tank 10 side, .

At this time, a branch pipe is provided between the LPG storage tank 10 and the connecting pipe 11, and a bypass relief valve 14 is provided in the branch pipe, so that when the abnormal pressure is generated due to the failure of the inverter of the submerged pump 30 The excess LPG is allowed to flow into the LPG storage tank 10 through the bypass relief valve 14. [

In addition, the strainer 13 is installed on the connection pipe 11 so that it can be cleaned through one strainer 13 even during use.

On the other hand, the nozzle rod 22 is installed on the inner center of the LPG supply pipe 21 on a concentric axis.

The nozzle cooling air supply pipe 23 is provided on the outside of the LPG supply pipe 21 on a concentric axis and supplies cooling air for cooling the LPG supply pipe 21 therein. The low temperature supply hole 23a Cooling air is supplied through the LPG supply pipe 21 to prevent LPG from being vaporized in the pipe due to overheating of the LPG supply pipe 21.

The combustion air supply pipe 24 is provided concentrically with the nozzle cooling air supply pipe 23 and supplies combustion air (high temperature air) to the inside of the combustion air supply pipe 24, Can utilize waste heat generated during combustion to save fuel.

On the other hand, the liquid LPG ejected from the nozzle hole 21ca of the LPG supply pipe 21 is burned while mixing the nozzle cooling air and the combustion air. 3, the reference numeral 27 denotes a protective cover 27, which serves to protect the LPG leakage preventing cover 25. As shown in FIG.

In the LPG direct injection and combustion apparatus 100 constructed as described above, the liquid LPG filled in the LPG storage tank 10 is directly supplied to the injection burner 20 through the connection pipe 11.

The liquid LPG supplied through the LPG supply pipe 21 of the direct injection burner 20 is injected through the nozzle hole 21ca of the injection nozzle 21c while passing through the injection nozzle 21ca.

And the phenomenon of freezing by the heat of vaporization between the LPG sprayed through the nozzle hole 21ca and the surrounding object by the cooling air supplied to the nozzle cooling air supply pipe 23 provided concentrically on the LPG supply pipe 21 Aka: icing phenomenon).

The combustion air is supplied to the outside of the nozzle cooling air supply pipe 23 through the combustion air supply pipe 24 so that the liquid LPG at the end of the nozzle hole 21ca is mixed with the cooling air and the combustor air, And the injection burner 20 is directly burned by an ignition source provided outside.

The discharge area of the nozzle rod 22 and the nozzle hole 21ca provided in the LPG supply pipe 21 can be adjusted by moving the nozzle hole 22 forward and backward using the flow rate adjusting knob 26. [

On the other hand, when the pressure of the connecting pipe 11 is lowered to the LPG vapor pressure or lower when the LPG is injected through the direct injection burner 20, a phenomenon in which LPG in the liquid in the pipe is vaporized (a phenomenon called a vapor lock) occurs. Therefore, the submerged pump 30 installed in the storage tank 10 can be driven and controlled by the inverter circuit, so that the pressure of the connection pipe 11 can be raised to the vapor pressure of LPG or more and directly supplied to the injection burner 20. [ That is, the inverter set pressure of the submersible pump 30 is set to be maintained at the propane vapor pressure of 35 占 폚 to prevent vaporization of liquid LPG in the pipe (vapor lock phenomenon).

At this time, the check valve (12) of the connection pipe (11) can prevent backflow to the LPG storage tank (10) side.

In addition, when the pump is excessively pumped due to failure of the inverter in the submerged pump 30, the LPG can be recovered to the LPG storage tank 10 again by the bypass relief valve 14 on the connecting pipe 11.

≪ Embodiment 2 >

Referring to FIGS. 5A and 5B, the second embodiment of the present invention will be described focusing on the control of the LPG discharge amount as the nozzle rod 22 moves.

The direct injection burner 20 of the present invention is provided with the conical nozzle rod 22 as in the above embodiment so that the conical nozzle rod 22 advances in the inside of the injection nozzle 21c, 21ca) (Fig. 5A).

In addition, the conical nozzle rod 22 can open the nozzle hole 21ca while moving backward (specifically, moving in a direction opposite to the ejection direction of the ejection nozzle) to the inside of the ejection nozzle 21c (state of FIG.

Specifically, when the nozzle rod 22 is retracted to the inside of the injection nozzle 21c (that is, when the nozzle hole is to be opened), the conical end of the nozzle rod 22 is drawn inward of the injection nozzle 21c, The tip of the nozzle rod 22 is not exposed to the outside of the nozzle 21c (see Fig. 5B).

 Therefore, the direct injection burner 20 of the present invention is configured such that the end of the nozzle rod 22 is completely drawn into the injection nozzle at the time of opening the nozzle hole 21ca, And the end portion is located in the liquid LPG (i.e., inside the injection nozzle 21c to which the liquid LPG is supplied). Therefore, it is possible to prevent a part of the nozzle rod 22 from being positioned within the jetting area (LPG spraying state), thereby preventing an icing phenomenon (a phenomenon in which the tip of the nozzle rod is frozen).

While the present invention has been particularly shown and described with reference to the particular embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims (6)

1. 1. An LPG direct injection burner comprising a direct injection burner connected through a connecting line to an LPG storage tank,

   In the direct injection burner,

   An injection nozzle having a nozzle hole formed at a tip thereof to supply liquid LPG to the connection pipe; And

   And a nozzle rod that opens and closes the nozzle hole of the injection nozzle so as to move back and forth in the injection nozzle,

   Wherein the nozzle hole is reversed from a state in which the tip of the nozzle rod is blocking the nozzle hole of the injection nozzle to reverse the direction of injection of the injection nozzle, thereby opening the nozzle hole.
2. The method according to claim 1,

   Wherein the tip of the nozzle rod is conical,

   Wherein the nozzle rod is configured such that a tip end of the nozzle rod is not exposed to the outside of the nozzle hole when the nozzle hole is opened.
3. The method according to claim 1,

   Wherein the injection nozzle is communicated with the connection pipe via an LPG supply pipe,

   A nozzle cooling air supply pipe disposed outside the LPG supply pipe and supplied with cooling air to cool the LPG supply pipe and the injection nozzle,

   And a combustion air supply pipe disposed outside the nozzle cooling air supply pipe and supplied with combustion air to the injection direction side of the injection nozzle.
4. 4. The method according to any one of claims 1 to 3,

   A submerged pump installed in the LPG storage tank for supplying LPG in liquid form to the direct injection burner,

   Further comprising an inverter for controlling driving of the submerged pump to maintain a constant pressure in the pipes communicating with the connection pipe and the connection pipe.
5. 5. The method of claim 4,

   A branch disposed between the LPG storage tank and the connection pipe,

   Further comprising a bypass relief valve installed in said branch pipe.
6. The method of claim 3,

   The LPG supply pipe,

   A center of the fuel regulating apparatus in which a supply hole for supplying the liquid LPG is formed and in which a discharge hole for discharging the liquid LPG supplied from the supply hole is formed,

   Further comprising a flow rate control rod connected to the discharge hole at the center of the fuel regulator and connected to the injection nozzle.

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