JPS59119108A - Burner - Google Patents

Abstract

PURPOSE:To achieve a universalization and miniaturization of the equipment by burning various fuels different in the combustion velocity at the same or higher combustion speed with the adjustment of the temperature of a mixed gas. CONSTITUTION:Air flowing in from an air feed tube 10 is heated with a heat exchanger 8 and is mixed with a fuel injected from a main burner nozzle 13 to be burned with a main burner 3a. Here, adjusting the temperature of a mixed gas enables the burning a fuel at the same or a higher combustion speed regardless of the combustion speed thereof. The combustion level is set with a fuel adjusting valve 11 arranged for a main fuel feed tube 1a and then, the fuel is sent to the main burner 13. A combustion gas after the heating of the mixed gas with the heat exchanger 8 is sent to a combustion chamber through an induction tube 9 to eliminate loss of energy. Thereafter, all the combustion gas reaches a heat exchanger 5 to heat water fed from a water feed tube 6 and the heated water is fed from a hot water feed tube 7 as hot water.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a combustion device for heating or hot water supply by burning fuel such as gas or oil. This invention relates to a device that burns at a burning speed.

Conventional configurations and their problems Conventionally, there has been a configuration shown in FIG. 1 as a means for preheating a gas mixture with a slow combustion rate to increase the combustion rate and expand the combustion range. 1 is a fuel and air supply pipe, 2 is a mixing chamber, 3 is a burner, 4 is a combustion chamber, 5 is a heat exchanger, and 6 is a water supply pipe.

Next, the operation will be described. The air-fuel mixture is introduced into the mixing chamber 2 through the fuel and air supply pipe 1 and is combusted in the burner 3. At that time, the combustion chamber 4. Bars 3. The mixing chamber 2 is integrally constructed of a material with good thermal conductivity, such as A1, and as the outer wall of the combustion chamber 4 is heated, the temperature of the outer wall of the mixing chamber 2 also rises, heating the air-fuel mixture. Therefore, even if the fuel has a slow combustion speed, it can be sufficiently combusted by the burner 3. The combustion gas enters the heat exchanger 5 and heats the water entering from the water supply pipe 6.

With this configuration, the air-fuel mixture is preheated and even fuel with a slow combustion speed can be combusted, but on the other hand, fuel with a high combustion speed becomes faster and faster, causing abnormal heating of the burner 3 and backfire. There were drawbacks.

Purpose of the Invention The present invention not only solves the conventional problems, but also makes the device universal and burns various fuels with different combustion speeds at the same high combustion speed by adjusting the mixture temperature. The purpose is to make it smaller.

Universalization means that 15 types of gas fuels that exist in Japan can be burned in one device, and there is no need to change the fuel nozzle or burner itself as in the past. In the past, in order to make the device universal, devices were designed to suit the most unfavorable fuels, so making the device smaller was not sufficient, but by keeping the combustion rate the same and at a higher speed, it is possible to make the device even smaller than before. This is what happens.

Structure of the Invention In order to achieve the above object, there is provided a main burner for burning fuel, a mixing chamber disposed upstream of the main burner, and a mixing chamber in the mixing chamber.
It has a heating heat exchanger for increasing the temperature of the air-fuel mixture and an auxiliary burner for heating the heating heat exchanger, and a main fuel supply pipe for supplying fuel to the main burner, and a main fuel supply pipe for supplying fuel to the main burner. It has a branched auxiliary fuel supply pipe that supplies fuel to the auxiliary burner, and a fuel distribution valve disposed on the main fuel supply pipe.

DESCRIPTION OF EMBODIMENTS An actual winding example of a water heater according to the present invention will be described with reference to FIG. Components that are the same as those in FIG. 1 are designated by the same numbers.

1a is a main fuel supply pipe, 1b is an auxiliary fuel supply pipe, 3a is a main burner, 3b is an auxiliary bar, 7 is a hot water supply pipe, 8 is a heating heat exchanger, 9 is a combustion gas guide pipe, and 10 is a supply pipe. trachea, 1
1 is a fuel control valve, 12 is a distribution valve, and 13 is a main burner nozzle. A mixing chamber 2 is arranged upstream of the main burner 3a, a heating heat exchanger 8 and a main burner nozzle 13 are provided in the optical mixing chamber 2, and an auxiliary burner 3b is provided in the heating heat exchanger 8. The main burner nozzle 13 is connected to a main fuel supply pipe 11L provided with a fuel control valve 11, and the auxiliary burner 3b has an auxiliary fuel supply pipe 1b branched from the main fuel supply pipe 1a. A distribution valve 12 is disposed in the auxiliary fuel supply pipe 1b.

Further, an air supply pipe 10 is opened upstream of the mixing chamber 2.

There is a combustion chamber 4 downstream of the main burner 3a, and an auxiliary burner 3
A combustion gas guide pipe 9 is connected to guide exhaust gas from b. A heat exchanger 5 is located downstream of the combustion chamber 4 and is composed of a water supply pipe 6 and a hot water supply pipe 7.

According to the embodiment of this configuration, the combustion air flowing in from the air supply pipe 10 is heated by the heating heat exchanger 8 and raised to a predetermined temperature, and then mixed with the fuel ejected from the main nozzle 13. , is burned in the main burner 3a. At this time, by adjusting the air-fuel mixture temperature, even fuels with different combustion speeds can be burned at the same high combustion speed.

FIG. 2 shows the relationship between the air-fuel mixture temperature and the combustion rate in OH4. As can be seen from Figure 2, the combustion rate of 13A fuel whose main component is OH4 is 30 cm at room temperature.
It can be seen that if the mixture temperature is set to 210'C, the combustion rate will be the same as the combustion rate of 6C fuel whose main component is hydrogen, which has the fastest combustion rate, so cyn /sec.

The mixture temperature is adjusted by the distribution valve 12 disposed in the auxiliary fuel supply pipe 1b only when changing the fuel. Distribution rate R
is calculated using the following formula.

-Hu Cp: Specific heat kcal/pry' Δt: (Required mixture temperature - room temperature) va: Theoretical air amount nr"/nr' gasm: Excess air ratio Hu: Total calorific value k(, +Vnf fKa 513A
In the case of a system, the distribution ratio is 10% or less.

The amount of combustion is determined by the main fuel supply pipe 1a [the installed fuel control valve 11].
is set and sent to the main bar 13. The combustion gas from the auxiliary burner after the mixture has been heated by the heating heat exchanger 8 is sent to the combustion chamber through the combustion gas guide pipe 9, so there is no loss of energy. After that, all the combustion gas reaches the heat exchanger 6, heats the water supplied from the water supply pipe 6,
The heated water turns into hot water and is supplied from the hot water supply pipe 7.

In this example, by heating the air-fuel mixture using an auxiliary burner and a heating heat exchanger, fuels with different combustion speeds can be heated at the same and high combustion speed of 8o(7)/sec. It can be burned, and the entire device can be completely universal. In addition, the device can be made smaller because it burns at a high combustion rate.

In addition, there are effects such as no energy being wasted and no energy loss.

Effect of the invention According to the present invention, the following effects can be obtained.

(1) By heating the air-fuel mixture using an auxiliary burner and a heating heat exchanger, fuels with different combustion speeds can be burned at the same high speed, making the device completely universal.

(2) The device can be small in order to perform combustion at a high combustion rate.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional embodiment, Fig. 2 is a front sectional view showing an embodiment of the water heater of the present invention, and Fig. 3 is a graph showing the relationship between air-fuel mixture temperature and combustion rate in the water heater. It is. 12L...Main fuel supply pipe, 1b...Auxiliary fuel supply pipe, 3a...Main burner, 3b...
... Auxiliary burner, 8 ... Heating heat exchanger, 1
2...Distribution valve. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Zusei+Kyuuen・C

Claims (1)

[Claims] A main burner for burning fuel, a mixing chamber disposed upstream of the main burner, a heating heat exchanger for increasing the temperature of the mixture in the mixing chamber, and a heating heat exchanger for heating the heating heat exchanger. A main fuel supply pipe that supplies fuel to the auxiliary burner and the main burner, an auxiliary fuel supply pipe that branches from the main fuel supply pipe and supplies fuel to the auxiliary burner, and an auxiliary fuel supply pipe that is arranged in the auxiliary fuel supply pipe. A combustion device comprising a fuel distribution valve.