JPH03221717A - Combustion device - Google Patents

Abstract

PURPOSE:To quicken a combustion response and reduce occurrence of white smoke and odor at the time of ignition by a method wherein a combustion device is provided with a combustion sensing means arranged near the end of flame transfer of a burner through an igniting means and a combustion amount control device for inputting a combustion sensing signal from the combustion sensing means and outputting a combustion amount adjusting signal to a combustion supplying means. CONSTITUTION:When ignited, a combustion control means 13 outputs a driving signal to an igniting means 5 and outputs a combustion amount control signal, for feeding a fuel of predetermined ignition level to the first burner 2, to a fuel supplying means 4A. After this operation, an ignition signal is inputted from a combustion sensing means 6 and the combustion amount control signal is immediately outputted from an operation adjusting device 8 so as to perform control of a hot water temperature. When a flame is transferred to a burner, a combustion control means 13 outputs combustion amount control signals to feed fuel of predetermined flame transferring level to the first burner 2 and the second burner 3 for fuel supplying means 4A and 4B. After this operation, means 11 for sensing combustion in the second burner 3 detects completion of the flame transferring in the second burner 3. Concurrently, the combustion control means 13 outputs the combustion amount control signal from the operation adjusting device 8 to the fuel supplying means 4A and 4B so as to perform a hot water temperature control.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in the ignition of a combustion device and a means for detecting flame transfer between burners, and to an improvement in start-up performance.

2. Description of the Related Art A conventional control device of this type has a heat exchanger 1, a first burner 2 heating the heat exchanger 1, and a second burner 3, and fuel supply means (consisting of an electromagnetic pump and a vaporizer) 4A, 4B for supplying fuel to the burners 2 and 3,
Ignition means 5 for igniting the vaporization part to the first burner 2;
Combustion detection means (such as a flame rod) 6 that detects ignition of the first burner 2, hot water temperature detection means (such as a thermistor) 7 that detects hot water temperature, and an operation controller that operates, stops, and sets the hot water temperature. 8, and operation from the operation controller 8,
Stop signal, outlet temperature set value signal, and fuel supply means 4A
, 4B, and a combustion controller 9 that outputs a combustion amount control signal corresponding to the combustion amount to each of them.

With this configuration, the operation at the start of hot water supply will be explained as shown in the time charts shown in FIGS. 7(a) to 7(d).

a, b, c, and d are respectively a flow rate detection signal for detecting hot water discharge by a flushing device, an operation signal for the ignition means 5, a combustion amount adjustment signal for the fuel supply means 4A and 4B, and a combustion detection signal for the combustion detection means 6. It is a time characteristic. Hot water supply starts at t=t1, and the combustion controller 9 outputs a drive signal to the ignition means 5 at 1-12. At t=t3, the combustion controller 9:
A combustion amount control signal is output to the fuel supply means 4A to send the fuel (FIS) at the preset ignition level to the first burner 2. After that, at t=t4, the combustion detection means 6
Input the ignition signal from t=tS, that is, after ΔT1 from t=t4, drive it! A combustion amount control signal is output to the fuel supply means 4A, 4B so that the hot water temperature reaches the set temperature from the i-mode controller 8, thereby performing hot water temperature control (so-called feedback control).

Further, when the combustion amount increases, when the flame transfers from the first burner 2 to the second burner 3, the combustion controller 9 sets the preparatory settings to the fuel supply means 4A and 4B at the time when the flame transfer starts, as in the case of the above-mentioned ignition. fuel at the flame transfer level (FI
H: not shown) is outputted to output a combustion amount control signal that sends the fuel (not shown) to the first burner 2 and the second burner. Then ΔT2(
After that (not shown), a combustion amount control signal is similarly outputted to the fuel supply means 4A, 4B so that the hot water temperature is adjusted to the set temperature from the operation controller 8, thereby controlling the hot water temperature.

Problems to be Solved by the Invention However, in the above III, the fuel output at the ignition level must be maintained for one ΔT1 after inputting the ignition detection signal from the combustion detection means 6. That is, since the combustion detection means 6 is located near the ignition means 5,
The time when the ignition signal is detected and the time when the flame transition of the first burner 2 is completed are not necessarily the same, but rather vary greatly depending on the burner surface temperature, etc., and the burner surface temperature has not risen sufficiently at the start of operation, and when continuous use At this time, the burner surface temperature has risen sufficiently, and the ignition completion time for the entire burner surface varies. Therefore, the time required to complete ignition is 1. When it is shorter than ΔT1, the ignition level fuel output is maintained unnecessarily, and when the required time to complete ignition is longer than t=ΔTl, the hot water temperature is adjusted to the set temperature from the operation controller 8 before the flame spreads to the entire burner surface. Since the burner outputs a combustion amount control signal so that the burner does not ignite, some parts of the burner are not yet ignited, causing white smoke and odor.

Also, when transferring the flame from the first burner to the second burner, the same tendency occurred.

Therefore, it was necessary to maintain the fuel output at the ignition level of t=∆1, taking into account the variation in the ignition completion time over the entire burner surface. However, in order to quickly bring the hot water temperature up to the set temperature from the operation controller 8, it is originally a dryer that outputs a combustion amount control signal corresponding to the combustion amount to the fuel supply means 4A, 4B immediately after ignition is detected. There is a point.

The present invention solves such conventional problems by reliably detecting ignition of the fuel filling device regardless of the burner surface temperature, etc., and immediately shifting to combustion corresponding to the required combustion amount when ignition is completed. The first priority is to speed up the start-up combustion response and reduce the generation of white smoke and odor at the time of ignition.
The purpose of

The second purpose is to reliably detect flame transfer between the burners of the combustion equipment, regardless of the burner surface temperature, etc., and when the flame transfer is completed,
The purpose is to improve the combustion response of a combustion device that involves burner switching by immediately shifting to combustion according to the required combustion amount, and to reduce the generation of white smoke and odor when the flame changes.

Means for Solving mH In order to achieve the above-mentioned first object, the present invention provides a combustion detection means disposed near the end of the burner's flame transition by the ignition means, and a fuel supply means for supplying fuel to the burner. , a combustion amount control means for inputting a combustion detection signal from the combustion detection means and outputting a combustion amount adjustment signal to the fuel supply means.

In order to achieve the second object, two aspects of the present invention include a combustion detection means disposed near the end of the flame transition of a plurality of burners, a fuel supply means for supplying fuel to the burners, and a combustion detecting means disposed near the end of the flame transition of a plurality of burners, and a fuel supply means for supplying fuel to the burners; The combustion control means terminates the time period during which the air-fuel ratio is maintained constant upon input of a combustion detection signal, and outputs a combustion amount adjustment signal to the fuel supply means.

According to the above-described structure, the present invention immediately shifts to combustion that satisfies the required combustion amount when ignition completion is detected, despite variations in ignition completion time due to temperature conditions on the burner surface. Furthermore, since the combustion amount is not changed during the flame transfer to the entire burner, it is possible to reduce the generation of white smoke and odor at the time of ignition.

Furthermore, when the burner is scratched, the combustion is immediately shifted to the required combustion amount when the completion of the burner inspection is detected, due to the variation in the completion time of the burner due to the temperature condition of the surface of the scratched burner. Furthermore, since the amount of combustion is not changed during the course of fire spreading to the entire dog scratching harness, it is possible to reduce the generation of white smoke and odor.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. Note that the same members as in the conventional example FIG. 6 are given the same numbers.

FIG. 1 is a control configuration diagram of the oil water heater of the present invention. 10
is the position where the first burner 2 completes the flame transition, that is,
11 is a combustion detection means (flame rond, etc.) installed on the opposite side of the ignition means 5 and the first burner 2;
11 is a combustion detection means (flame rond, etc.) installed on the opposite side of the interface 12 between the first burner 2 and the second burner 3 until the flame transfer of the burner 3 is completed, and 13 is,
The combustion detection signals from the combustion detection means 10 and 11 are inputted, and the time for maintaining the air-fuel ratio at a constant level at the time of ignition and burner inspection is terminated by inputting the combustion detection signal, and the fuel supply means 4A and 4B are sent to the fuel supply means 4A and 4B. This is a combustion control means that outputs a combustion amount adjustment signal.

In the above configuration, firstly, the operation at the time of ignition will be explained.
The timing charts shown in fe) to (c) in the figure are obtained. (e) to (c) in FIG. 2 correspond to (al to c) in FIG. 7 of the conventional example.
They respectively correspond to time chart 1 shown in (d).

Hot water supply starts at 1=11, and combustion control means 13 starts at t=t2.
outputs a drive signal to the ignition means 5. At t=t3, the combustion control means 13 outputs a combustion amount control signal to the fuel supply means 4A to send the fuel (FIS) at the preset ignition level to the first burner 2. After that, at t-t4, the ignition signal is input from the combustion detection means 6, and the operation is started immediately! 11 Outputs a combustion amount flilltl signal to the fuel supply means 4A such that the hot water temperature is equal to the set temperature from the node 8,
Control the water temperature.

Further, the operation at the time of large-scale inspection of the burner due to an increase in combustion amount, etc., will be explained as shown in the time charts shown in (i) to (e) of FIG. 3. (il, (j), (g), (1)
, 6'n), (i) is a set temperature signal of the operation controller 8, (j) is a combustion amount adjustment signal to the fuel supply means 4A corresponding to the combustion amount of the first burner 2, and (2 ) is a combustion amount adjustment signal to the fuel supply means 4B corresponding to the combustion amount of the second burner 3, (1) is a combustion detection signal of the combustion detection means 10, and (e) is a combustion detection signal of the combustion detection means 11. This is the time characteristic of the signal. At t=t5 in FIG. 3(i), when the set hot water temperature of the operation regulator 8 is shifted from the LOW level to the HI level, the flame is transferred from the first burner 2 to the second burner 3. Similarly to the above-mentioned ignition, at the start of flame transfer, the combustion control means 13 supplies fuel (FIH) at a preset flame transfer level to the fuel supply means 4A and 4B as shown in FIGS. ) to the first burner 2 and the second burner. Then t-
At tS, the combustion detection means 11 of the second burner 3 detects the completion of the flame transfer of the second burner 3. At the same time, the combustion control means 13 outputs a combustion amount control signal to the fuel supply means 4A, 4B to control the hot water temperature so that the hot water temperature reaches the set temperature from the operation controller 8.

Moreover, when combustion is once completed and combustion is started again, that is, during intermittent operation, the surface temperature of burner 2.3 does not drop extremely. Therefore, in this case, the ignition level maintenance time (t=t3 to 1=14) at the start of combustion is shorter than when the surface temperature of burner 2.3 is low.

Therefore, in order to reliably detect ignition using the combustion detection means disposed near one end of the burner/lP, early ignition can be achieved while reducing white smoke and odor generation due to variations in ignition time due to burner surface temperature, etc. At the time of completion, combustion responsiveness can be improved by immediately shifting combustion according to the required combustion amount.

In addition, in order to reliably detect flame transfer between burners using combustion detection means installed near the completion of flame transfer for each burner, the flame transfer time is While reducing white smoke and odor generation,
When the early flame transition is completed, combustion responsiveness can be improved by immediately shifting to combustion corresponding to the required combustion amount.

Next, other embodiments will be described.

In the embodiment of FIG. 4, the first burner 14 and the second burner 15 are connected longitudinally and the ignition means 16.1
7 are respectively attached to the first burner 14 and the second burner 15 on the short side 18 of the burner.

The combustion detection means 19.20 is mounted on the short side 21 opposite to the mounting position of the ignition means 16.17. FIG. 5 is a longitudinal sectional view taken along the line AA' in FIG. 4. The first burner 14 and the second burner 15 are independent from each other, and each burner has an ignition means and a combustion detection means.

In this case, since the first burner 14 and the second burner 15 are independent of each other, when switching burners, that is, from burning only the first burner 14 to burning the first burner 14 and the second burner 15, When shifting, the ignition means 17 located in the second burner 15 is operated in the same way as at the time of ignition in the embodiments of FIGS. 1 and 2. In particular, in the case of a burner with an elongated shape as in this example, since the ignition start position near the ignition means and the ignition completion position are far apart, the combustion amount cannot be changed after confirming ignition in the entire burner area. As a result, it is possible to suppress harmful effects such as generation of CO2, white smoke, and odor due to unburned gas, unburned fuel, etc. caused by means of changing the combustion amount without completing burner ignition and flame transition.

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

1) In order to ensure ignition detection by the combustion detection means placed near the end of the burner flame transition, the combustion amount is varied before the ignition of the entire burner is completed in response to variations in ignition time due to burner surface temperature, etc. This reduces white smoke and odor generation. Further, when early ignition is completed, combustion responsiveness (heating rate) etc. can be improved by immediately shifting combustion to the required combustion amount.

2) In order to reliably detect flame transfer between burners using the combustion detection means installed near the completion of flame transfer for each burner, it is possible to detect scratches due to variations in flame transfer time due to burner surface temperature, etc. Since the combustion amount is not changed before the flame transfer to the entire burner on the side burner is completed, the generation of white smoke and odor during the flame transfer can be reduced.

Further, when the early flame transfer is completed, combustion responsiveness (heating rate) etc. can be improved by immediately shifting to combustion corresponding to the required combustion amount.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the control configuration of an oil water heater according to an embodiment of the present invention, Figs. 2 and 3 are time charts showing the operating characteristics of the control device, and Fig. 4 shows an embodiment of the same. A top view of the main part of the burner, Fig. 5 is a sectional view taken along the line A-A' in Fig. 4, Fig. 6 is a block diagram of the control configuration of a conventional oil water heater, and Fig. 7 shows the operating characteristics of the control device. This is a time chart. 2.14...First burner, 3.15...
...Second burner, 4A, 4B...Fuel supply means, 5.16.17...Ignition means, 10.11
．． 19.20... Combustion detection means, 13...
... Combustion control means.

Claims (2)

[Claims] (1) a burner for burning fuel, an ignition means for igniting the fuel, a combustion detection means disposed near the end of the burner's flame transition by the ignition means, and a fuel supply means for supplying fuel to the burner; A combustion apparatus comprising combustion amount control means for inputting a combustion detection signal from the combustion detection means and outputting a combustion amount adjustment signal to the fuel supply means. (2) Combustion detection means disposed near the end of the flame transition of a plurality of burners, a fuel supply means for supplying fuel to the burners, and a time period for maintaining the air-fuel ratio constant during flame transition of the burners; A combustion apparatus comprising combustion control means that terminates upon input of a combustion detection signal and outputs a combustion amount adjustment signal to the fuel supply means.