JPH0791614A - Burner - Google Patents

Abstract

PURPOSE:To hold the temperature of a vaporization part at a proper value when temperature is low and to reduce the temperature of the heat recovery part of the vaporization, in a burner to vaporize liquid fuel for combustion. CONSTITUTION:A burner is formed such that a combustion air feed route 20 is arranged to the periphery of a burner part 14 and after the combustion heat of the burner part 14 is recovered to preheat combustion air, the air is fed in a vaporization part 11. Thus, the combustion air is fed to a vaporization part 11 after it is preheated by the combustion heat of the burner part 14, and cooling by the combustion air and emission of heat to the periphery of the vaporization part are reduced. This constitution facilitates holding of the temperature of the vaporization part at a proper value regardless of the change of an outside air temperature, and reduces the temperature of the heat recovery part of the vaporization part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustor for vaporizing and burning liquid fuel.

[0002]

2. Description of the Related Art Generally, in a combustor of this type, as shown in FIG. 2, it is necessary to heat the vaporizing section 1 to an appropriate temperature in order to vaporize the liquid fuel. Therefore, at the time of ignition, the vaporization unit 1
It is heated by energizing the heater 2 embedded in. At the time of combustion, the heat of combustion is recovered from the burner section 3 to maintain the temperature of the vaporization section 1. When the heat recovery is insufficient, the heater 2 is energized to maintain the temperature of the vaporization section 1.

[0003]

However, in the above-mentioned conventional configuration, it is very difficult to keep the temperature of the vaporizing section 1 at an appropriate temperature only by heat recovery, depending on the change of use environment. That is, since the temperature of the vaporization section is balanced by heat recovery, it is affected by changes in ambient temperature and combustion air temperature. In particular, in an apparatus such as an outdoor combustor in a cold region, which takes in combustion air from the outside, the degree of cooling by the air taken in from the combustion air supply pipe 4 increases and the temperature of the vaporization section 1 also decreases when the outside air temperature decreases. However, there is a problem that the energization rate to the heater 2 increases, the electricity cost increases, and the combustion becomes unstable. Also, even if you look at the temperature distribution of the vaporization part, the vaporization part is cooled by the heat of vaporization and combustion air, so in order to keep the temperature of the vaporization part at an appropriate temperature, raise the temperature of the combustion heat recovery part of the vaporization part. It is necessary to set it, and there is a problem in the durability of the vaporization part itself.

The present invention has solved such a problem and enables the temperature of the vaporization section to be maintained at an appropriate temperature without increasing the energization rate to the heater even at low temperatures, and the temperature of the vaporization section heat recovery section. The purpose is to reduce the number of the vaporized portions and improve the durability of the vaporized portion.

[0005]

In order to solve the above-mentioned problems, the present invention provides a combustion air supply path around the burner section, recovers the combustion heat of the burner section and preheats the combustion air to vaporize it. It is configured to be supplied to.

[0006]

According to the present invention, the combustion air having the above-mentioned structure is
After being preheated by the combustion heat of the burner section, it is supplied to the vaporization section, and cooling by the combustion air and heat radiation to the periphery of the vaporization section are reduced. Therefore, it is possible to easily maintain the vaporization part temperature at an appropriate temperature regardless of the change in the outside air temperature and reduce the temperature of the heat recovery part of the vaporization part.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, 11 is a bottomed cylindrical liquid fuel vaporization and mixing section (hereinafter referred to as vaporization section), and a hole 11a for supplying fuel and combustion air is provided at a part of an eccentric position of a peripheral wall thereof.
The fuel supply nozzle 12 is exposed. Reference numeral 13 is a heater embedded in the vaporizing section 11, 14 is a burner portion covering the upper opening of the vaporizing section 11, and a flame port 14a is provided on the peripheral wall thereof. Reference numeral 15 is a burner cap which covers the upper opening of the burner portion 14, 16 is an air guide disposed around the burner portion 14, 17 is a burner case which surrounds the outer periphery of the vaporizing portion 11 and the air guide 16, and 18 Is a combustion air supply pipe for supplying combustion air into the burner case 17, 19 is a partition plate in the burner case, and the combustion air flows around the air guide 16 and then into the vaporization section 11. Air supply path 20 for being supplied
Is formed.

In the above structure, the fuel injected into the vaporizing section 11 by the pump at the start of combustion is vaporized in the vaporizing section 11 which is heated to a high temperature by the heater 13, and is sent into the vaporizing section 11 by a blower or the like. Premix with incoming combustion air. The premixed gas flows into the burner portion 14 while swirling in the vaporization portion 11, and is ejected from the flame port 14a on the side wall of the burner portion 14. Then, when it is ignited by an appropriate ignition means, the combustion is started, and a flame which is almost in close contact with the flame port 14a is formed.

When the combustion is started, the air guide 16 is heated by the flame and becomes high in temperature. At this time, the combustion air flows along the inner wall of the air guide 16 as indicated by the arrow 21, and is heated by the heat of combustion. Therefore, the combustion air is supplied to the vaporization section 11 after being preheated by the combustion heat.

As a result, the vaporizing section 11 is cooled by the combustion air and the amount of heat radiated to the surroundings is reduced, and the vaporizing section temperature can be easily maintained at an appropriate temperature even at a low temperature. Further, it is not necessary to set the temperature of the heat recovery portion 11b of the vaporization section 11 to be higher than in the conventional case, and the temperature is reduced to reduce the temperature.
The durability of can also be improved.

[0011]

As is apparent from the above description, the combustor of the present invention is provided with the combustion air supply path around the burner section, recovers the combustion heat of the burner section, preheats the combustion air, and vaporizes the combustion section. The temperature of the vaporization section can be easily maintained at an appropriate temperature even when the temperature is low, and the electricity bill can be saved and combustion can be stabilized. Furthermore, the temperature of the heat recovery part of the vaporization part can be reduced, the durability of the vaporization part itself is improved, and the reliability is high during long-term use.

[Brief description of drawings]

FIG. 1 is a sectional view of a combustor according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional combustor.

[Explanation of symbols]

 11 Vaporizing Section 14 Burner Section 16 Air Guide 17 Burner Case 19 Partition Plate 20 Combustion Air Supply Path

Claims (1)

[Claims] 1. A vaporization section for vaporizing liquid fuel and mixing it with combustion air, a burner section for burning the mixed gas, and a post-evaporation section for preheating the combustion air by recovering combustion heat from the burner section. A combustor provided with a combustion air supply path for supplying combustion air from a proper place into the vaporization section.