JPS5912223A - Burner device - Google Patents

Abstract

PURPOSE:To enable uniform combustion of a mixture gas, by a method wherein an exhaust chamber connected to an enclosed combustion chamber covering a wire netting-shaped burner port part is mounted, a pressure averaging plate is located therebetween, and a catalyst is placed in the exhaust chamber. CONSTITUTION:The inside of a casing 1 of a hot air tape space heater consists of a rod-form burner 2 formed in a semicircle in cross section, a primary air port 4, a mixing pipe 5, a mixture gas chamber 6, a burner port part 7 made of a wire netting and an enclosed combustion chamber 8 for preventing entrance of a secondary air. A pressure averaging plate 10 is located between the combustion chamber 8 and an exhaust chamber 9 connected thereto, and a catalyst 11 is positioned at the upper part of the exhaust chamber 9. The gas jetted through a gas nozzle 3 sucks the air required for combustion through a primary air port 4, the gas enters the mixture gas chamber 6 through the mixing pipe 5 and is jetted into the combustion chamber 8 through the burner port part 7. Simultaneously, the gas is ignited for surface combustion, but combustion of the mixture gas is averaged by the action of the pressure averaging plate 10 and the catalyst. This permits the prevention of worsening of combustion.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to improvement of a burner device for a warm air heater, particularly an indoor open type warm air heater, which aims to make combustion exhaust gas cleaner and achieve a higher TDR. It is.

Structure of the conventional example and its problems Since the burner of the conventional household combustion appliance used a Bunsen burner, it had two missing points such as a high NOx value. Therefore, in appliances that are used for a long time, such as heating appliances, a premix burner such as a Schwank burner has been used to reduce NOx.

However, since the heat capacity of the ceramic plate that forms the flame opening is large, the Schwank burner has the disadvantage that it takes a long time to reach stable combustion, and that the airflow has a negative effect on combustion, so it can be opened indoors. Many hot air heaters use Bunsen burners.

A wire mesh burner shown in FIG. 3 can be considered as a burner that compensates for the drawbacks of the Schbank burner and further reduces NOx. In the wire mesh burner 1o1, the fuel ejected from the gas nozzle 102 and the primary air sucked by its ejector effect are mixed, and as a premixture, the mixture passes through the mixture chamber 103 and performs surface combustion in the wire mesh flame opening IQ4. In order to maintain stable combustion by keeping the temperature of the wire mesh flame port 104 constant at a high temperature, the wire mesh flame port 104 is
An alumina rod 105 is provided inside the wire mesh burner 104, and in order to effectively capture radiant heat from the red-hot wire mesh burner port 104 to the outer periphery, three pages of the outer periphery of the wire mesh burner 101 are constructed of a glass tube 106. . This wire mesh burner 1
Compared to the Shuppank burner, the heat capacity of the burner opening is smaller, so the load can be reduced, and heat radiation can be carried out effectively, resulting in a lower flame temperature and lower NOx. Note that 107 is a combustion chamber, 10B is an auxiliary air port that compensates for the lack of primary air when the primary air port is clogged, and 109 is a spark plug.

However, like the Schpank burner, wire mesh burners that perform surface combustion tend to have poor combustibility due to the influence of outside air currents, have a narrow combustion range (hard to achieve TDR, and have a negative impact on the human body due to NOx in the exhaust gas). It has the disadvantage that the ratio of NO2 is clearly large.

Purpose of the Invention The present invention solves the disadvantages of conventional examples, such as combustion being easily affected by airflow, TDR being difficult to achieve in premixed surface combustion, and the proportion of NO2 accounting for a large proportion of NOx in exhaust gas. The present invention provides a burner device that is improved.

Structure of the Invention In order to achieve the above-mentioned object, the present invention provides a burner with a flame port formed by a wire mesh, a combustion chamber and an exhaust chamber that prevent the inflow of secondary air, and a pressure equalizing plate between the combustion chamber and the exhaust chamber. A catalyst body is installed in the exhaust chamber to achieve uniform combustion and expand the low-load combustion range.
The aim is to improve DR properties and reduce NO2 to No using a catalyst.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a side cross-sectional view showing the principle of a hot air heater using the burner device of the present invention, and FIG. 2 is a perspective view showing the constituent elements of the burner device of the present invention.

In the figure, 1 is a casing of a hot air heater, 2 is a rod-shaped burner with a semicircular cross section, and primary air ports 4 and 4 are provided opposite to a gas nozzle 3. Mixing tube6. Mixture chamber6. It consists of a flame throat section 7 made of wire mesh, and a combustion chamber 8 with a sealed structure that prevents the inflow of secondary air. A transition metal-based pressure equalizing plate 5 10 made of lath mesh, wire mesh, etc. is provided between the exhaust chamber 90 connected to the combustion chamber 8, and a transition metal-based catalyst body 11 is provided in the upper part of the exhaust chamber 9. It is provided. The catalyst body 11 may be a honeycomb-shaped ceramic body supporting a transition metal catalyst, or a porous transition metal plate.

The air sucked in from the suction port 13 by the blower 12 sucks combustion gas, passes through the hot air passage 14 around the outer periphery of the combustion chamber 8, and is blown from the blowout port 16.

Although not shown, a first gas valve for controlling combustion and a second gas valve for high-low control of combustion amount are provided, and a control circuit discharges and ignites from the spark plug and detects the output of the combustion detection element. , to control combustion.

In the above configuration, the gas ejected from the gas nozzle 3 is
Air necessary for combustion is sucked in as primary air from the primary air port 4 and guided to the mixture chamber 6 while being mixed in the mixing pipe 6.

The air-fuel mixture is injected into the combustion chamber 8 from the flame port 7 having a semi-cylindrical cross section and made of a wire mesh, and at the same time, it is ignited by discharge 1 by the spark plug, and surface combustion occurs in the flame port 7. Since the flame opening part 7 is formed of a wire mesh and has a diameter of 6, its heat capacity is small, and the time required to reach stable combustion is quick. Further, a pressure plate 10 is provided between the combustion chamber 8 and the exhaust chamber 9. Since the catalyst body 11 is provided in the exhaust chamber 9, the air-fuel mixture ejected from the flame port 8 can be made uniform, and local deterioration of combustion can be prevented by uniform combustion, so that low-load combustion can be achieved. Furthermore, since the flame port 8 is covered with a sealed combustion chamber 9 that prevents the inflow of secondary air, the temperature field is maintained even during low load, enabling lower load combustion than before and achieving a high TDR. I can do it.

On the other hand, during high-load combustion, the outer periphery of the combustion chamber 8 is
4, it is cooled without taking radiant heat and the burner port 8 does not become abnormally high temperature and cause a bank fire.

Further, in the exhaust chamber 9 downstream of the combustion chamber 8, a catalyst body 11 made of a transition metal system such as stainless steel, molybdenum steel, iron-chromium steel, etc. is provided in a high temperature atmosphere of about 500'C to 700C. Therefore, the catalyst body 11 becomes a reduction catalyst,
NO2 in the exhaust gas is reduced to NO.

Since the 7-basic combustion chamber 8 has a sealed structure that prevents air from entering, the influence of the airflow within the combustion chamber 8 caused by the blower 12 is prevented.
In addition to preventing deterioration of combustibility, since auxiliary air is not introduced as bypass air, the concentration of 02 in the exhaust gas that contacts the catalyst body 11 is reduced, so that no.
oxidation is reduced, reduction efficiency is improved, and low NO2 is achieved.

Furthermore, during low-load combustion where the amount of combustion is reduced, the combustion temperature decreases and the combustion gas temperature also decreases, so the pressure equalizing plate made of a transition metal system exposes the back of the NO2-No reduction catalyst.

In addition, if the rod-shaped burner with a semicircular cross section of this embodiment is used, it can be used as an open-type hot-air heating device and can be made thinner and shorter in depth than a cylindrical burner.

Effects of the Invention As is clear from the above explanation, according to the present invention, uniform combustion is achieved by providing a sealed combustion chamber and an exhaust chamber that prevent the inflow of secondary air, and by providing a pressure equalizing plate and a catalyst body. A burner device that enables low-load combustion, expands the TDR range, achieves stable combustion unaffected by airflow, and is suitable for clean open hot air heating equipment with a high reduction effect to NO2-No. It is possible to provide the following.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing an embodiment of the burner device of the present invention used in a hot air heating appliance; Fig. 2 is a perspective view showing the components of an embodiment of the burner device of the present invention; The figure is a sectional view showing a conventional bar. 2...burner, 7...flame port, 8...
...Combustion chamber, 9...Exhaust chamber, 10...
...Pressure equalization plate, 11...Catalyst body.

Claims (1)

[Claims] A burner having a flame hole shaped with a wire mesh and performing all-primary mixed surface combustion is provided with a combustion chamber having a sealed structure that covers the flame hole and prevents air from flowing into the combustion surface. A burner device comprising connected exhaust chambers, a pressure equalizing plate made of a transition metal lath mesh, wire mesh, etc. between the combustion chamber and the exhaust chamber, and a transition metal catalyst in the exhaust chamber.