JPS63143411A - Catalytic burner - Google Patents

Abstract

PURPOSE:To obtain catalytic burner by which comfortable warmth taking feeling can be obtained from the beginning of operation, by providing ignitors and flame sensors both in the downstream side of a mixing burner and in the downstream side of a catalyst body, by burning fuel on the surface of a catalyst body at the beginning of ignition, and by changing a mode into a catalytic combustion after the catalyst body is preheated and its temperature reaches an activated temperature. CONSTITUTION:A mixing burner 3 is ignited by an ignitor B13 and combustion is started. A catalyst body 5 on the downstream side is preheated by combustion heat by the mixing burner 3 during combustion. The temperature in diffused hot air from a diffuser 7a lowers temporarily during preheating of a catalyst body 5, but heat is accumulated in an exhaust gas passage 9 and on the surface of a catalyst body 5 by combustion on the surface of a catalyst body 5 at the beginning of ignition, so that the degree of lowering of temperature in the diffused air is less and it does not cause a bad feeling to a human body. Afterward when the catalyst body 5 is preheated up to an activation temperature, the temperature is sensed by a flame sensor B14, and the combustion by the mixing burner 3 is stopped. The catalyst body 5 which is preheated to the activation temperature by feeding of gas to it by the intermediary of a mixing burner 3 can burn now spontaneously, and after that catalytic combustion can be maintained by the catalyst body 5 itself.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a catalytic combustor that mixes fuel and air and performs an oxidation reaction using a catalyst, and at the same time uses the heat generated at this time for purposes such as heating.

2. Prior Art A conventional catalytic combustor of this type is disclosed in Japanese Patent Application Laid-Open No. 59-131812, and has the structure shown in FIG. The catalyst body 5a downstream of the preheating burner 3a is preheated by the combustion heat of the burner 3a, and after the preheating is completed, the catalyst body 5a performs catalytic combustion.

The problem to be solved by the invention is that with such a configuration, the fourth
As shown by song #JB in the figure, the temperature of the hot air outlet is
There was a problem in that the temperature did not rise for several minutes after ignition during preheating, and cold air was blown out, making it impossible to obtain a comfortable feeling of warmth.

Means for Solving the Problems The present invention has been made to solve the above problems, and includes an igniter A downstream of the catalyst body that causes the catalyst body to perform surface combustion at the initial stage of ignition, and a catalyst body. A flame detector A is provided to detect the surface temperature of the flame detector A.

In a closed chamber downstream of the mixing burner, there is an igniter B that burns the mixing burner to preheat the catalyst after completion of surface combustion of the catalyst, and a flame detector B that detects the temperature of the mixing burner.
It has been established that

By doing this, surface combustion is performed by the catalyst at the initial stage of ignition, and hot air is sent into the room.

Combustion stops when the catalyst reaches a certain temperature. Next, combustion is carried out in a mixing burner, and hot air is sent into the room while preheating the catalyst to raise it to its activation temperature using the heat of combustion. Stop combustion of the mixing burner at the above activation temperature,
Subsequently, catalytic combustion begins in the catalyst body, and from then on the combustion continues to continue sending warm air into the room.

Example An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2 showing the structure of the embodiment, 17 is a main body, which has a box-shaped closed chamber 6 inside and a closed chamber 6.
A mixing burner 3 that mixes gas supplied from the nozzle 1 and air supplied from the combustion fan 4 through the air hole 2 and burns the mixture is provided on the inlet 6a side of the combustion chamber. On the other hand, on the exit 6b side of the closed chamber 6, a catalyst body 5 is provided, which is a honeycomb-shaped heat-resistant ceramic coated with a high-temperature oxidation catalyst. The downstream side of the catalyst body 5 is connected to a blowout lower aK opened at the lower part of the main body 17, and a warm air fan 7 is provided inside the blowoff lower aK, and further downstream near the catalyst body 5 is an igniter A1.
5. Each is equipped with a flame detector AI6. Also, there is an igniter B13 downstream near the mixing burner 3. Flame detectors B14 are respectively provided, and an exhaust gas passage 9 surrounded by the outside of the closed chamber 6 and the inside of the main body 17 is formed between the downstream of the catalyst body 5 and the hot air fan 7.

The operation of this embodiment will be described below.

First, at the start of combustion in the combustor, gas is supplied from the nozzle 1 to the catalyst body 5 via the mixing burner 3, and at the same time, combustion air sucked from the air hole 2 from the combustion fan 4 is supplied to the catalyst body via the mixing burner 3. Supply to 5. Next, the igniter A15 ignites the surface of the catalyst body 5 and causes it to burn. The exhaust gas after combustion is mixed with indoor air by the hot air fan 7, passes through the exhaust gas passage 9 downstream of the catalyst body 5, and is instantaneously turned into warm air and sent into the room from the blowout lower a at the bottom of the main body 17. .

When the temperature of the catalyst body 5 increases due to this combustion.

This is detected by the flame detector A16, and the surface combustion of the catalyst body 5 is temporarily stopped.

After that, gas is supplied to the mixing burner 6 again.

The mixing burner 3 is ignited by the igniter B13 to cause combustion. The downstream catalyst body 5 is preheated by the combustion heat generated by the mixing burner 6.

During preheating of the catalyst body 5, the temperature of hot air blown from the blowout lower a temporarily decreases as shown in curve MA in FIG. 5. Due to the heat storage on the surface, the blowout temperature does not drop as much, so you do not feel any discomfort.

After that, the catalyst body 5 is preheated to the activation temperature for hours.

The temperature is detected by the flame detector B14, and combustion in the mixing burner 3 is stopped.

When gas is again supplied to the catalyst body 5 via the mixing burner 3, the catalyst body 5, which has been preheated to the activation temperature, self-combusts, and thereafter catalytic combustion by the catalyst body 5 is maintained.

At this time, the temperature of the warm air blown from the hot air blowing lower a is the fourth
As shown by curve mA in the figure, the temperature rises and gradually stabilizes.

Effects of the Invention Above 9 According to the present invention, an igniter and a flame detector are provided downstream of the mixing burner, and an igniter and a flame detector are provided downstream of the catalyst body. 2. At the initial stage of ignition, combustion occurs on the surface of the catalyst body. Then, combustion starts and ready-made air is sent indoors.

When the surface of the catalyst body is sufficiently heated, combustion is stopped and combustion is switched to combustion using a mixing burner to preheat the catalyst body to its activation temperature.Once the activation temperature is reached, the combustion is switched to catalytic combustion. It is possible to provide a catalytic combustor that provides a comfortable heating window from the beginning of operation.

FIG. 2 is a schematic cross-sectional view of the same, FIG. 3 is a cross-sectional view of the conventional main part, and FIG. 4 is a correlation diagram of the temperature at the outlet of the combustor and time.

6...Mixing burner.

5... Catalyst body.

6...Secret room, 6a...Entrance, 6b...
·Exit.

13...Igniter B.

14...Flame detector B.

15...Igniter A.

16...Flame detector A.

17...Main body.

Claims (1)

[Claims] A closed chamber (6) with an inlet (6a) and an outlet (6b) is formed in the main body (17), and the inlet (6a) in this closed chamber (6)
In a catalytic combustor equipped with a mixing burner (3) on the side and a catalyst body (5) on the outlet (6b) side, surface combustion is performed on the catalyst body (5) downstream of the catalyst body (5) at the initial stage of ignition. An igniter A (15) for controlling the temperature and a flame detector A (16) for detecting the surface temperature of the catalyst body (5) are installed. An igniter B (13) that burns the mixing burner (3) to preheat the catalyst (5) after the surface combustion of the medium (5) is completed, and a flame that detects the temperature of the mixing burner (3). A catalytic combustor characterized by being provided with a detector B (14).