JP3710926B2 - Combustion equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a combustion apparatus including a fuel pump that supplies liquid fuel to a gasification burner that vaporizes and burns liquid fuel, and a controller that controls a supply fan that supplies combustion air to the burner. .
[0002]
[Prior art]
In the present invention, a combustion apparatus including a controller that controls a fuel pump that supplies liquid fuel to a burner and an air supply fan that supplies combustion air to the burner is described in, for example, Japanese Patent Laid-Open No. 6-159668. Has been.
[0003]
[Problems to be solved by the invention]
In the above-described combustion apparatus, as a general post-purge operation at the time of fire extinguishing, an air supply fan is turned on at a maximum speed for a certain period of time to discharge gas in the burner or cool the burner. It is rotating. During this post-purge operation, unburned gas still remains in the burner, and the burner is also at a high temperature without being cooled. Therefore, the unburned gas naturally burns, and this combustion gas ( Since this combustion gas is naturally not controlled to optimize the air-fuel ratio, it also naturally includes unburned gas, etc.), so that the odor hits the nose and causes a bad smell. It was. The present invention provides a combustion apparatus that can be controlled so as not to bother the odor as much as possible.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention described in claim 1 has a gasification cylinder, a gasification type burner for vaporizing and burning the liquid fuel in the vaporization cylinder, and supplying the liquid fuel to the burner A fuel pump for supplying the combustion air to the burner, a burner motor for rotationally driving the supply air fan, and a controller for controlling the operation of the burner motor and the fuel pump. In the combustion apparatus described above, the controller, after stopping the fuel supply from the fuel pump to the burner during the post-purge operation after the combustion is stopped , temporarily reduces the burner motor to the minimum rotational speed, and provided a control means for controlling a substantially maximum rotational speed a rotational speed of said over certain time Banamota substantially decrease control to the minimum rotational speed from after being continued for a predetermined time of the Banamota And wherein the door.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a hot water heating apparatus using a combustion apparatus (heat source machine) 1 according to the present invention. Hot water from a combustion apparatus 1 installed outdoors passes through an outdoor-side piping 2 and an indoor wall 3 It flows to the floor heating panel 8 laid on the indoor floor 7 through the hot water outlet 4, the plug 5, and the indoor-side piping 6, and radiates heat here, and then returns to the indoor return piping 9, the plug 5, the outlet 4. In addition, the combustion apparatus 1, the outdoor-side piping 2, the hot water outlet 3, the plug 4, the indoor-side piping 6, the floor heating panel 8, and the indoor-side return so as to be returned to the heat source device 1 again via the outdoor-side return piping 10 The pipe 9, the plug 5, the hot water outlet 4, and the outdoor side return pipe 10 are connected in a ring shape.
[0006]
In FIG. 2, the combustion apparatus 1 has a box-like casing 21 having a horizontally long rectangular shape in plan view and a substantially square shape in front view. The casing 21 includes a top plate 22, a bottom plate 23, left and right side plates 24, 25, and a back. It consists of a plate 26 (see FIG. 1) and a detachable front panel 27 (see FIG. 1). Inside the casing 21 is an oil burner (burner) 27, an instantaneous heat exchanger 28 connected to the oil burner 27, and a cistern tank 29 for storing hot water heated by the instantaneous heat exchanger 28. A circulating pump 30 for circulating the hot water once stored in the cistern tank 29 to the floor heating panel (external radiator) 8, an oil supply port 31, and an oil amount indicator 32 on the upper surface, and the oil burner 27 A fixed oil tank 34 or the like for storing oil such as kerosene supplied to is stored.
[0007]
In addition, ventilation portions 33 (not shown) for communicating the inside and outside of the casing 21 are provided at appropriate positions at the lower portion of the right side plate 25 of the casing 21 and the upper and lower portions of the back plate 26. The front panel 27 is provided with an opening / closing lid (not shown) in the center portion facing the oil supply port 31 of the oil tank 34, and a viewing window (facing the oil amount indicator 32 adjacent to the opening / closing lid). (Not shown) is provided, and the opening / closing lid is opened so that oil can be supplied from the oil supply port 31 of the oil tank 34.
[0008]
The oil tank 34 is fixedly mounted on the bottom plate 23 of the casing 21 by appropriate fixing means, and the circulation pump 30 is fixedly mounted by appropriate fixing means located beside the oil tank 34. Is placed.
[0009]
The oil tank 34 is set to have an oil storage amount of about 15 to 25 liters. The oil stored in the oil tank 34 is pumped up by a fuel pump 35 such as an electromagnetic pump, and a fuel supply pipe 36. To the oil burner 27. The oil burner 27 is composed of a rotary gasification burner with variable combustion amount that vaporizes and burns kerosene, and the heat generation amount can be varied in the range of about 1,200 to 3,000 kcal / h according to the heat demand of the equipment. It can be done.
[0010]
The instantaneous heat exchanger 28 heated by the oil burner 27 has a base portion connected to a tip portion of the oil burner 27 and an exhaust box 37 at the tip portion. The exhaust gas in 37 is discharged from the exhaust top 39 through the exhaust pipe 38.
[0011]
The connecting structure X between the oil burner 27 and the instantaneous heat exchanger 28 is installed horizontally in the upper space in the casing 21 immediately above the oil tank 34, and the connecting structure X installed horizontally is An appropriate place of the oil burner 27 on one end side is fixed and held by a fixing plate device 44 to be described later, and an exhaust box 37 on the other end side is placed on one side upper portion in the casing 21 via a locking fitting (not shown). The support plate 42 is attached and held. A blower 43 supplies combustion air to the oil burner 27, and the blower 43 is connected to the oil burner 27.
[0012]
The fixing plate device 44 has a lower edge portion fixed to a fixing metal fitting 45 mounted on the upper surface of the oil tank 34 by screws or the like, and a rear edge portion fixed to the back plate 26 of the casing 21 by screws or the like. A main fixing plate 41 provided with a front opening notch for inserting the oil burner 27, and an attachment / detachment for screwing the main fixing plate 41 from the front after inserting the oil burner 27 into the notch of the main fixing plate 41. The sub-fixing plate 40 is made possible.
[0013]
45 is a supply port lid of the cistern tank 29, 46 is a control box, 47 is a return side connection port, and hot water after heat radiation is returned to the floor heating panel 8 returned from the return side connection port 47 to the heat source unit 1. The hot water that has flowed to the instantaneous heat exchanger 28 through the pipe 47 and heated there to rise in temperature enters the cis-turn tank 29 through the first outgoing pipe 49, and the hot water in the cis-turn tank 29 is It enters the circulation pump 30 through the outgoing pipe 50, where it is pressurized and flows to the outgoing side connection port 52 through the third outgoing pipe 51.
[0014]
Next, the vicinity of the oil burner 27 will be described in detail. The oil burner 27 includes a bottomed cylindrical burner case 60 and a fan case provided outside the bottom of the burner case 60 as shown in FIG. 61, a vaporizing cylinder 62 accommodated and fixed in the burner case 60, blower fans (air supply fans) 80 and 80 housed in the fan case 61, and a blower fan 80 mounted outside the fan case 61. A motor (burner motor ) 63 such as a direct current motor that rotationally drives 80 is provided, and the fan case 61 is provided with an air inlet 64.
[0015]
The vaporizing cylinder 62 is formed in a bottomed cylindrical shape, and a primary air port 69 is provided in the center of the bottom wall, and an electric heater 64 for vaporization such as a sheathed heater is embedded in the peripheral wall. the middle portion of the tip-sided, a ceramic burner head 66 in a flat plate shape having a plurality of burner ports 65 and 65, are mounted to the center line b in a substantially horizontal, upstream than the burner head 66 The inside of the vaporizing cylinder 62 serves as a mixing unit 67 that vaporizes petroleum fuel (for example, kerosene) and mixes the vaporized fuel and primary air from the blower fans 80 and 80 flowing in via the primary air port 63. Yes. Reference numeral 68 denotes a rotary atomizing / stirring device disposed in the mixing unit 67. The rotary atomizing / stirring device 68 is driven to rotate by the motor (burner motor ) 63, and the fuel supplied from the fuel supply pipe 69 is centrifuged. The vaporized fuel and the primary air are agitated and mixed while spraying with force.
[0016]
An annular storage chamber 70 is formed between the burner case 60 and the vaporizing cylinder 62, and the ventilation fan 80 is inserted into the storage chamber 70 through vent holes 71, 71 provided on the bottom wall of the burner case 60. , 80 part of the air is sent as secondary air. A ring plate 72 is provided at the downstream end of the air storage chamber 70 between the tip of the vaporizing cylinder 62 and the burner case 60. The ring plate 72, the burner case 60, and the vaporizing cylinder are provided. 62 forms the air storage chamber 70.
[0017]
Further, the ring plate 72 is provided with an inclined surface portion 72A in the vicinity of the vaporizing cylinder 62, and the inclined surface portion 72A is supplied with secondary air to the outer periphery of the flame F formed in front of the burner head 66. The secondary air holes 72A, 72A, 72B, 72B are arranged at substantially equal intervals on the entire circumference, and these secondary air holes 72A, 72B are the sum of the opening areas located above the center line A of the burner head 66. Is set to be larger than the sum of the opening areas located below the center line.
[0018]
In FIG. 3, 73 is a flame detector, 74 is a spark plug, and 75 is a temperature detector that detects the temperature of the vaporizing cylinder 62.
[0019]
Reference numeral 76 denotes a temperature detector for detecting the temperature of air sucked into the air inlet, and reference numeral 77 denotes a controller disposed in the control box 46, which includes a microcomputer. The controller 77 controls the operation of the motor 63 and the fuel pump 35 that rotationally drives the blower fan 80, and further supplies the fuel from the fuel pump to the burner during the post-purge operation after the combustion is stopped. Since the control is performed to stop the blower fan (air supply fan) once to almost the minimum rotational speed and then control the rotational speed to the substantially maximum rotational speed, it can be said to be a controller and control means. . The meaning of the minimum number of rotations is the number of rotations that can be rotated, and is not 0 rotations, even if the number of rotations (for example, 633 rpm) that stops immediately after receiving a small amount of resistance or the like. In actuality, the minimum number of revolutions is actually set to a number slightly higher than this number of revolutions (for example, 700 rpm).
[0020]
Reference numeral 90 denotes a refractory material using a ceramic fiber, which is wound, for example, inside the heat exchanger 28.
[0021]
In the combustion apparatus configured as described above, the control is performed at the time of operation stop (combustion stop), that is, at the time of post purge, as described below.
[0022]
When combustion is stopped, combustion OFF processing, that is, post-purge operation is performed (ST1). First, in order to stop the fuel supply, the electromagnetic valve is turned off (closed), and the electromagnetic pump is turned off (stopped, ST2). Next, it is determined whether 90 seconds have elapsed since the operation stop (ST3). If 90 seconds have not elapsed, it is determined whether 10 seconds have elapsed (ST4). If 10 seconds have not elapsed, the rotational speed of the motor ( burner motor ) 63 is controlled to the minimum rotational speed (ST5). Since the actual rotational speed of the burner motor gradually decreases as shown by the solid line B in FIG. 5, the minimum rotational speed is only a few seconds. If control of this minimum rotation speed continues for 10 seconds, this time, the rotation speed to the burner motor is controlled to the maximum rotation speed. As shown by the solid line B in FIG. 5, the rotation speed of the actual burner motor gradually speed increases, reaching the maximum rotational speed is after approximately 40 seconds from the post purge operation starts.
[0023]
That is, it is controlled to be less than the maximum rotation for about 40 seconds from the start of the post purge operation. In this combustion apparatus, when the rotation speed is controlled to be less than the maximum rotational speed for about 30 to 40 seconds, the temperature in the combustion cylinder decreases to about 500 ° C. (the temperature in the combustion cylinder at the time of combustion is about 800 to 1000 ° C. This temperature is lower than the temperature at which the liquid fuel spontaneously ignites (about 600 ° C.). For this reason, the liquid fuel that is supplied to the burner and remains unburned does not spontaneously ignite at an inappropriate air-fuel ratio, and can suppress emission of harmful components such as odors on the nose. It is.
[0024]
Although depending on the odor component, it is approximately 20% of the control when such control is not performed (dotted line A shown in FIG. 5, conventional control for controlling to the maximum rotation speed for 90 seconds after the combustion is stopped). It was possible to reduce the odor.
[0025]
In particular, the refractory material using ceramic fibers, thermal combustion tube for hard releasing (burner) is itself unburned fuel for remain hot in which easily pyrophoric, to suppress the spontaneous combustion, It is possible to suppress the emission of gas that tends to cause odor. Also, since the burner motor is operated at the maximum number of rotations from 40 seconds to 90 seconds after the combustion is stopped, the inside of the combustion cylinder can be cooled and the exhaust gas inside is discharged so that the inside of the combustion burner is not easily contaminated as usual. It can also be.
[0026]
In this embodiment, the control is applied to the post-purge operation after the combustion is stopped. However, such control may be performed in the post-purge operation when ignition fails.
[0027]
【The invention's effect】
According to the present invention, there is provided a gasification type burner which has a vaporization cylinder and vaporizes and burns liquid fuel in the vaporization cylinder, a fuel pump for supplying liquid fuel to the burner, and the burner for combustion. A combustion apparatus comprising an air supply fan for supplying air, a burner motor that rotationally drives the air supply fan, and a controller that controls the operation of the burner motor and the fuel pump. During the post-purge operation after the stop, after the fuel supply from the fuel pump to the burner is stopped, the burner motor is once reduced to the substantially minimum rotation speed, and the burner motor is controlled to decrease to the substantially minimum rotation speed. since a structure in which a control means for controlling a substantially maximum rotational speed a rotational speed of the Banamota over certain time after being continued for a predetermined time, the control means The air supply fan is controlled so that the unburned gas reaches a temperature at which it does not ignite spontaneously, so that the unburned gas is less likely to ignite spontaneously and suppresses emission of harmful components such as odors on the nose. Can do.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a schematic configuration of a hot water heating apparatus using a combustion apparatus of the present invention.
FIG. 2 is a front view showing a state where a front panel of the combustion apparatus is removed.
FIG. 3 is an explanatory view showing a cross section in the vicinity of the burner of the combustion apparatus.
FIG. 4 is a flowchart showing control of post-purge operation of the combustion apparatus.
FIG. 5 is a diagram showing the relationship between the time of the combustion apparatus and the rotational speed of the burner motor.
[Explanation of symbols]
1 Oil burner (burner)
35 Fuel pump
62 vaporization cylinder
63 motor (burner motor)
80 Blower fan (air supply fan)
77 Controller (control means)

Claims (1)

A gasification type burner having a vaporization cylinder, and vaporizing and burning liquid fuel in the vaporization cylinder; a fuel pump for supplying liquid fuel to the burner; and for supplying combustion air to the burner In a combustion apparatus comprising an air supply fan, a burner motor that rotationally drives the air supply fan, and a controller that controls the operation of the burner motor and the fuel pump.
In the controller, during the post-purge operation after the combustion is stopped, after the fuel supply from the fuel pump to the burner is stopped, the burner motor is once reduced to a substantially minimum rotational speed, and the burner motor is almost at the minimum A combustion apparatus comprising: control means for controlling the rotational speed of the burner motor to a substantially maximum rotational speed over a predetermined time after the reduction control to the rotational speed is continued for a predetermined time .

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