JPS61243252A - Heater - Google Patents

Abstract

PURPOSE:To promote the rise-up of room heating and restrain the uncomfortable feeling of warm-air as well as the noise of fan especially in ..weak' operation used for a long period of time by a method wherein a main burner equipment and a catalyst combustion equipment are provided in parallel. CONSTITUTION:The catalyst combustion equipment 7 is arranged in front of the main burner 2 interposing the space of an exhaust gas path 6 between them. The catalyst combustion equipment 7 consists of a gas chamber 10, consti tuted in a burner case 8 and communicated with a gas supplying pipe 9, a temperature keeping tank 11, a preheater 12, a catalyst layer 13 and a protection net 14, which are laminated sequentially. In above-described constitution, 'strong' operation is effected upon rising up the room heating by driving both burner equipments to raise room temperature in a short period of time by the parallel heating configuration of radiation and warm-air, thereafter, the operating condi tion is shifted to the 'weak' operation and catalyst combustion is effected under a condition that warm-air is blown off slowly, whereby, the uncomfortable feeling due to warm-air or the noise of fan may be reduced remarkably.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an indoor exhaust type heating device that utilizes combustion heat of fuel as hot air by radiation or a fan.

2. Description of the Related Art Conventionally, this type of heating device mixes combustion gas produced by combustion with air sucked through an air supply port 5 provided at the upper part of the back of a box body 1', as shown in Fig. 2. There is a device that directs the warm air to the outside of the box body from the hot air outlet 6. In addition, the burner devices used in these heating devices include gilt-bronze burners, slit burners, and Schwank burners, and the combustion amount can be adjusted with a single burner or with multiple burners and adjusted by switching the burners. There are also those who do this.

Problems to be Solved by the Invention However, with the above configuration, hot air heating is performed regardless of whether the combustion amount is adjusted to "strong" or "weak", so the hot air may cause discomfort. However, there were drawbacks such as relatively high fan noise. Further, conventional burners have a problem of high combustion temperature and generation of nitrogen oxides (Nox, No2).

The present invention solves such conventional problems by promoting heating start-up, suppressing hot air discomfort and fan noise, and suppressing the generation of nitrogen oxides, especially during "low" operation during long operating hours. The aim is to achieve cleaner combustion and improve heating comfort.

Means for solving the above-mentioned problems In order to solve the above-mentioned problems, the heating device of the present invention has a main burner device at the rear of a box body having a hot air fan below, a catalytic combustion device in front of this, and an exhaust passage. The combustion and air blowing control of both burners is performed by installing the burners side by side through the burners.

According to the above-described configuration, the present invention mixes the combustion exhaust gas produced by burning fuel in both the main burner device and the catalytic combustion device with the air sucked from the air supply port of the box body at the time of heating start-up, and supplies the mixture to the exhaust passage. The hot air flows down through the hot air fan and is discharged to outside air from the hot air outlet. Additionally, it provides comfortable radiation from the combustion surface of the catalytic combustion device. Furthermore, during "weak" operation, only the catalytic combustion device is combusted, and the warm air fan is stopped or the amount of air blown is reduced, thereby improving heating comfort.

EXAMPLES Hereinafter, examples of the present invention will be described based on the accompanying drawings. In Fig. 1, reference numeral 1 denotes a box, and a main burner device 2 (for example, 1500
~2500 Kcag/h), and above this a combustion chamber 3, a combustion chamber wall 4, and an exhaust port 5 are constructed. In front of the main burner device 2, a catalytic combustion device 7 of, for example, 800 to 1200 Kca #/h is disposed with a gap between the exhaust passages 6. The catalytic combustion device 7 constitutes a gas chamber 10 in which a gas supply pipe 9 is communicated within a burner case 8, and a heat insulating tank 11, a preheater 12, a catalyst layer 13, and a protective net 14 are stacked in this order. The catalyst layer 13 is made of Pt.

Oxidation catalysts such as Rh and Pa are supported on a base material such as alumina fiber. 15 is an exhaust port provided above the catalytic combustion device 7, 16 is an intake port provided above the back of the box body 1, 17 is a cross-flow type warm air fan provided below the main burner device 2, and 18 is a punched hole. 19 is a hot air outlet provided at the front lower part of the box body 1, 20 is a combustion gas flow, 21 is an air flow flowing in from the intake port 16, and 22 is a warm air outlet for heating.

In the above configuration, when starting heating, the warm air fan 1
After driving 7, the main burner device 2 and the catalytic combustion device 7
When both burner devices are operated, first, the main burner device 2 starts combustion, and the combustion gas is guided to the exhaust passage 6 via the exhaust port 5 and blown out from the hot air outlet 19. At the same time, the preheating heater 12 of the catalytic combustion device 7 is also energized, and when the catalyst layer 13 reaches a predetermined temperature (250 to 300°C), fuel is supplied from the gas supply pipe 9 to the gas chamber 10 and the catalyst layer 13 is heated. Catalytic combustion starts at , the power supply to the preheater 12 is also cut off, and steady combustion occurs, the surface temperature of the catalyst layer 13 is heated to 400 to 500''C, and radiant heat is released forward. Catalytic combustion The combustion exhaust gas after
From there, the hot air is guided to the exhaust passage 6 in the same manner as described above, and is discharged into the room as warm air.

In this way, at the start of heating, both burner devices are operated simultaneously (“high” operation), so that the room temperature reaches a predetermined temperature (for example, 15 to
When the temperature reaches 20'C), the room temperature is detected by a thermistor (not shown), etc., and the main burner device 2 is stopped by the control device (not shown) and switched to "low" operation, that is, the catalytic combustion device 7 The rotation of the warm air fan 17 is stopped or the number of revolutions is reduced while combustion is continued, and the heating mode is shifted to a heating mode mainly using radiant heating.

As described above, in this example, when heating starts, both burner devices are driven to "strong" operation, the room temperature is raised in a short time by a combination of radiation and hot air heating, and then the system is shifted to "low" operation. By performing catalytic combustion under gentle hot air blowing conditions, the discomfort caused by hot air and fan noise are greatly reduced, and an unprecedentedly high radiation efficiency (e.g. 45-50%) is ensured. This enables comfortable indoor heating. Furthermore, the amount of nitrogen oxides generated in indoor open type combustors, which has become a problem in recent years, is not generated at all due to the extremely low combustion temperature of 400 to 500'C in the catalytic combustion described above, making it possible to achieve clean combustion. It has the effect of becoming

Effects of the Invention As described above, the heating device of the present invention provides the following effects.

(1) Equipped with a main burner device and a catalytic combustion device,
By controlling the operation of both burner devices and the warm air fan according to the room temperature, it is possible to accelerate heating start-up, and to suppress the discomfort of hot air and fan noise during the frequently used "low" operation. This enables comfortable radiant heating.

(2) High radiation efficiency during catalytic combustion (e.g. 45-60
%) and by suppressing the combustion temperature,
A clean hot air heating device that does not generate nitrogen oxides (Nox, No2) can be provided.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a heating device according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of a conventional heating device. DESCRIPTION OF SYMBOLS 1...Box body, 2...Main burner device, 3...Combustion chamber, 5...Exhaust port, 6...
...Exhaust passage, 7...Catalytic combustion device, 1
3... Catalyst layer, 15... Exhaust port, 16
...Intake port, 17...Warm air fan, 1
9... Warm air outlet. Name of agent: Patent attorney Toshio Nakao and 1 other person2-
1-Main burner back 1 3--1 combustion chamber, 5--1 city to multi-degree Celsius outlet/6--class air outlet/7--4-fan/8-bow bottom outlet 2nd figure

Claims (2)

[Claims] (1) A main burner device having a combustion chamber provided in the rear part of the box body, a catalytic combustion device provided in front of the main burner device via an exhaust passage, and a catalytic combustion device provided above both burner devices and having a combustion chamber provided in the exhaust passage. It consists of an exhaust port communicating with the passage, an intake port provided on the back of the box and communicating with the exhaust passage, a warm air fan provided below both burner devices, and a hot air outlet communicating with the exhaust passage. A heating device that burns only a catalytic combustion device and controls the blowing of a hot air fan. (2) The heating device according to claim 1, which uses an oxidation catalyst such as Pt, Rh, or Pa on a base material such as alumina fiber as a catalytic combustion device.