JPH04225719A - Coal oil gasification type burner - Google Patents

Abstract

PURPOSE:To make it possible to control the temperature of a carburetor so that it may reach the optimum gasification temperature zone promptly by detecting the temperature of said carburetor when starting the operation of combustion and transferring the operation mode to phase control after having carried out forced power supply if the detected temperature fails to exceed a specified value. CONSTITUTION:When a water flow switch 15 is turned on during combustion stand by operation, a mode decision circuit 32 confirms if the temperature from a temperature sensor 7 exceeds the minimum gasification temperature of a carburetor. When it is YES and it is combustion operation mode, a controller 30 transmits an ON signal to a fan 3, a pump 8, and an igniter 14. In a forced power supply propriety decision circuit 33 compares the detection temperature of the carburetor from the temperature sensor 7 with a predetermined temperature, say, 300 deg.C. If the detected temperature is 300 deg.C or lower, it output a forced power supply command signal to a power supply change over circuit 34. A forced power supply control circuit 36 forcibly supplies power to a heater 6 for a specified time and operates a phase control circuit 35 after a specified time is over where phase control of the heater 6 is carried out so that the temperature of the carburetor may be at 280 deg.C for example.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil vaporizer that gasifies kerosene in a vaporizer and sends it to a combustion tube for combustion.

0002

[Prior art] Kerosene is gasified by a vaporizer equipped with a heater, jetted from a nozzle, guided to a combustion tube placed behind the nozzle, mixed with air sucked in by the ejector effect, and burned. Petroleum vaporization In a type combustor, it is necessary to stabilize the temperature of the vaporizer in order to obtain stable gas. The optimal temperature range is about 280° C. to 300° C., and the temperature of the vaporizer is stabilized by controlling the heater performance using on/off control, phase control, frequency division control, voltage control, etc.

[0003] Furthermore, it is preferable that the temperature during combustion standby operation, that is, when the combustion chamber is kept warm and on standby at a temperature that allows vaporization, is as low as possible from the viewpoint of power consumption. In order to satisfy both of these requirements, we set the temperature during combustion standby to the lowest temperature possible for vaporization, approximately 25
It is necessary to set the control temperature to 0°C and quickly shift the control temperature to 280°C to 300°C at the same time as the combustion operation start signal (water flow switch, etc.).

0004

As a means for changing the temperature as quickly as possible, it is conceivable to forcibly energize the heater for a certain period of time simultaneously with the combustion operation start signal. However, in that case, there is no problem if the number of times of ignition and extinguishing is small, but if ignition and extinguishment are repeated many times in a short period of time, the problem remains that the temperature rises more than necessary due to the influence of the forced energization.

Therefore, the present invention solves the above-mentioned drawbacks of the prior art, and makes it possible to quickly adjust the vaporizer temperature to the optimum vaporization temperature range as soon as the combustion operation starts, and even if the combustion operation is repeated in a short period of time, the temperature does not rise more than necessary. The purpose is to provide an oil vaporization type combustion machine that does not rise.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the oil vaporization type combustion machine of the present invention gasifies kerosene using a vaporizer equipped with a heater, ejects it from a nozzle, and places it behind the nozzle. The oil vaporizing type combustor introduces oil into a combustion tube and burns it, and the phase of the heater current is controlled so that the vaporizer is heated to around the lowest temperature possible for vaporization during combustion standby operation, and is heated to an optimum temperature during combustion operation. In a device in which the phase of heater energization is controlled so as to be maintained near the vaporization temperature, the temperature of the vaporizer is detected at the start of combustion operation, and if the detected temperature is below a certain temperature, forced energization is performed for a certain period of time. The present invention is characterized in that after the temperature is applied to the heater, the phase control is performed, and when the temperature exceeds the certain temperature, the phase control is directly performed.

[0007]

[Operation] During combustion standby operation, when a signal to start combustion operation is input, the temperature of the carburetor is first detected, and it is determined whether or not the temperature is below a predetermined temperature. And if the temperature is below the specified temperature,
The heater is forcibly energized for a certain period of time to quickly raise the temperature. Further, when the detected temperature of the vaporizer exceeds a predetermined temperature, the phase control during combustion operation is directly performed without being forcedly energized. Therefore, an unnecessarily high temperature increase due to forced energization is prevented, and stable vaporization is ensured.

[0008]

[Example] Fig. 1 shows one of the oil vaporization type combustion machines according to the present invention.
FIG. 2 is a block diagram of a heater control block diagram, and FIG. 3 is a flowchart showing an example of controlling a heater by a controller.

A combustion pipe 2 is provided in a case 1 of the water heater, a blower fan 3 is provided in the lower part, and a heat exchange section 4 for hot water supply is provided in the upper part of the case 1. The vaporizer 5 is provided with a heater 6, and the kerosene sent into the vaporizer 5 from the oil tank 17 by the electromagnetic pump 8 through the oil supply pipe 9,
There, it is vaporized into a gas, which is ejected from the nozzle 10 and sent into the combustion tube 2 at the rear. Then, it is mixed with the air sucked in by the ejector effect and combusted. The nozzle 10 is opened and closed by a needle valve 12 which is moved forward and backward by a solenoid 11. 13 is a return pipe for reliquefied oil.

The control of the apparatus is performed by a controller 30 built in a microcomputer 31 and a remote control 20. That is, when the operation switch 21 of the remote control 20 is turned on, the heater 6 is turned on via the controller 30, and the combustion standby operation is started. During this standby operation, the temperature sensor 7 and the controller 30 control the heater 6 so that the temperature of the vaporizer 5 is around the lowest vaporizable temperature, that is, around 250°C.
Phase control of energization. In the combustion operation, a bell (not shown) of the hot water outlet pipe is opened and the water flow switch 15 is turned on, so that a signal for starting combustion is input to the controller 30, which causes the blower fan 3, pump 8, solenoid 11, and igniter to be activated. 14 is turned on.

The energization of the heater 6 is controlled by phase control by the controller 30 during the combustion standby operation and during the combustion operation, but at the start of the combustion operation, it is determined whether or not to perform a short-term forced energization. That is, the controller 30 includes a mode determining circuit 32 that determines the mode of combustion standby operation or combustion operation, and a forced energization circuit that determines whether to perform forced energization based on a combustion operation start signal from the mode determining circuit 32. A rejection determination circuit 33 and an energization method switching circuit 34 for switching the energization method between forced energization and phase control are provided,
Either the phase control circuit 35 is activated after the forced energization control circuit 36 is activated for a certain period of time, or the phase control circuit 3 is activated from the beginning.
5.

Further explanation will be given with reference to FIG. 3 as well. When the water flow switch 15 is turned on during combustion standby operation (step 51), the mode determining circuit 32 checks whether the temperature from the temperature sensor 7 is at least 250°C, the minimum vaporization temperature of the vaporizer (step 52), and determines whether the temperature is at least 250°C. If so, it is determined that the mode is combustion operation mode. As a result, the blower fan 3, pump 8, solenoid 11,
An on signal for the igniter 14 is output (step 53). The forced energization necessity determining circuit 33 receives the signal for determining the combustion operation mode from the mode determining circuit 32, and the forced energization necessity determining circuit 33
The vaporizer detection temperature and a predetermined constant temperature, e.g. 3
00° C. (step 54), and if the temperature is below 300° C., a forced energization command signal is output to the energization method switching circuit 34. The energization method switching circuit 34 has a built-in timer, and sends an activation signal to the forced energization control circuit 36 for a certain period of time in response to the command signal. As a result, the forced energization control circuit 36 forcibly energizes the heater 6 for a certain period of time (step 55). Then, after a certain period of time has elapsed, an activation signal is sent to the phase control circuit 35. When the temperature exceeds 300°C in step 54, an activation signal is sent directly to the phase control circuit 35 via the energization method switching circuit 34, and the phase of the heater 6 is controlled so that the vaporizer temperature reaches 280°C (step 56). ).

[0013] In the foregoing description, since the full pressure of the AC voltage is applied during forced energization, the heating power of the heater 6 is strong and the vaporizer is quickly heated. The time for forced energization is determined in advance according to the size of the vaporizer, etc.

[0014]

Effects of the Invention The present invention has the above-described configuration and operation, and according to the oil vaporization type combustion machine according to claim 1, the temperature of the vaporizer is detected at the start of combustion operation, and the temperature is determined to be below a certain temperature. Forced energization is carried out for a certain period of time only when the above-mentioned certain temperature is exceeded, and the system shifts to phase control without forcing energization when the above-mentioned certain temperature is exceeded, so that the vaporizer temperature can be quickly raised to the optimum vaporization temperature range at the start of combustion operation. Even if combustion operation is repeated frequently in a short period of time,
Stable vaporization and combustion can be performed without the vaporizer increasing the temperature more than necessary.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a water heater which is an embodiment of an oil vaporization type combustion machine according to the present invention.

FIG. 2 is a heater control block diagram.

FIG. 3 is a flowchart showing an example of controlling a heater by a controller.

[Explanation of symbols]

1 case 2 Combustion tube 5. Vaporizer 6 Heater 7 Temperature sensor

Claims (1)

[Claims] 1. An oil vaporization type combustion machine in which kerosene is gasified by a vaporizer equipped with a heater, and the kerosene is ejected from a nozzle and guided to a combustion tube placed behind the nozzle for combustion, wherein the vaporizer is During the combustion standby operation, the phase of the heater current is controlled so that the temperature is heated to around the lowest vaporization temperature, and during the combustion operation, the heater current is phase controlled so that the temperature is maintained around the optimum vaporization temperature. At the start of operation, the temperature of the vaporizer is detected, and if the detected temperature is below a certain temperature, the heater is forcibly energized for a certain period of time and then shifted to phase control, and if it exceeds the certain temperature, it remains as it is. An oil vaporization type combustion machine characterized by being configured to shift to phase control.