JPH0599430A - Combustion apparatus - Google Patents

Abstract

PURPOSE:To further reduce white smoke, offensive odor at the time of an ignition by inhibiting to start a blower when a temperature of an evaporation cylinder is low and accelerating counting of a timer if a combustion occurs during heating of a burner. CONSTITUTION:When a combustion operation is started in a state that a temperature of a carburetor 2 is lower than 200 deg.C, an evaporation cylinder controller 6 starts energizing a preheating evaporation heater 4 and it deenergizes a blower 5 and so controls the heater 4 that the temperature of an evaporation cylinder becomes 235+ or -10 deg.. It accelerates counting of a 5-min timer to match an actual state during a heating sequence of a burner, and further shortens the sequence of the burner for counting at a double clock. Thus, it can set the temperature of the burner to an optimum state in a short time and set a cold ignition to a necessary minimum limit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus which vaporizes a liquid fuel such as petroleum and burns exhaust gas in the same manner as gaseous fuel in a clean and odorless manner.

[0002]

2. Description of the Related Art Conventionally, in a combustion apparatus that vaporizes and burns liquid fuel, when the burner is ignited in a cold state at the start of operation, the liquid fuel in the vaporized mixed gas causes a dew condensation phenomenon at the burner and significantly destroys the air-fuel ratio. , Causing deterioration of ignitability and generation of white smoke and odor.

In order to solve this problem, in a conventional combustion apparatus, for example, as shown in FIG. 5, when the temperature of the carburetor is 200 ° C. or lower at the start of operation, the cold flag is turned on, and in parallel with carburetor preheating. The burner was heated by controlling the blower, and the heating of the burner was completed when the vaporization cylinder temperature reached 320 ° C. Also, the cold flag is turned off at the end of the ignition of the first combustion, and the fuel pump is controlled to be larger than that at the time of normal ignition at the first operation start from the cold state, and cold ignition is performed to improve the ignitability. It was configured as. With this configuration, it was attempted to improve the ignitability when the burner started operation from a cold state and burned.

[0004]

In such a conventional combustion apparatus, since the blower is driven in parallel with preheating by starting the operation, the preheating completion time of the carburetor (the carburetor can vaporize the liquid fuel). There is a problem that it takes a long time to reach the temperature. In addition, the vaporizer heats the burner to 32
Since it was completed when the temperature reached 0 ° C., the burner heating was insufficient depending on the conditions, and there was a problem that white smoke and odor often occurred at the time of ignition. Further, even when there is sufficient time until the first combustion after the start of operation, there is a problem that white smoke and odor are still generated because cold ignition is performed in the first ignition.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a high-quality liquid fuel combustion apparatus in which white smoke and odor at the time of ignition are further reduced.

[0006]

To achieve the above object, the present invention provides a burner for burning a mixed gas of vaporized liquid fuel and air, a vaporizer for supplying the mixed gas to the burner, and the vaporizer. A blower that supplies air to the container,
A fuel pump for supplying liquid fuel to the vaporizer, a vaporization heater built in the vaporizer, a temperature sensor for detecting the temperature of the vaporizer, an igniter for igniting the burner, the blower and the fuel. A combustion controller that controls the combustion in the burner by controlling the pump and the igniter, and inputs the output of the temperature sensor to control the vaporization heater at a predetermined heating control temperature so that the temperature of the vaporizer is predetermined. When the heating start temperature reaches, the timer is started, hot air is sent to the burner by controlling the blower, and when a predetermined time elapses and the timer counts up, the control of the blower is stopped and the control temperature of the vaporization heater is stopped. And a vaporization cylinder controller having a burner heating controller for turning off a cold flag while switching the vaporization temperature to a vaporizable temperature, and the vaporization cylinder controller is a vaporization cylinder at the start of operation. Temperature is equal to or lower than a predetermined cold judgment temperature, a cold flag is turned on, the vaporization heater and the blower are controlled to perform a predetermined burner heating sequence, and then the cold flag is turned off. When the cold flag is on at the predetermined cold judgment temperature or higher, the cold flag is turned off after performing the predetermined burner heating sequence in the same manner as described above, and the cold flag is turned on when the vaporization cylinder temperature at the start of operation is the predetermined cold judgment temperature or higher. When the burner heating sequence is off, the combustion controller does not perform the burner heating sequence, and when the combustion controller starts combustion during the burner heating sequence of the burner heating controller, the blower and the fuel pump are connected after the burner heating sequence is completed. The burner heating controller controls combustion by controlling the igniter with a control amount different from the control amount. Switches the count of the timer to a fast count clock and continues, and when the timer does not count up after the end of combustion, the burner heating sequence is continued, and when the timer counts up during combustion, the cold flag is turned off. This is the means for solving the problem.

[0007]

According to the present invention, when the vaporizing cylinder temperature is low and the burner heating effect is low, the time until preheating is completed can be shortened by not starting the blower, and the burner heating is vaporized by the above means for solving the problems. By controlling the control temperature of the furnace and the time of the burner heating sequence, the burner temperature can be set to the optimum state reliably and in a short time.
In addition, since cold ignition can be minimized by increasing the timer count when burning while burning the burner, white smoke and odor can be significantly reduced while maintaining the conventional ignition performance. ..

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

As shown in the figure, the burner 1 burns the mixed gas supplied from the vaporizer 2. In the vaporizer 2, the liquid fuel pumped up from the fuel tank (not shown) by the fuel pump 3 is heated by the vaporization heater 4 to be vaporized,
It is mixed with the air supplied by the blower 5 and supplied to the burner 1 as a mixed gas. The vaporization cylinder controller 6 detects the temperature of the vaporizer 2 with the temperature sensor 7, and the vaporization heater 4
Control the power supply to. The combustion controller 8 controls the fuel pump 3, the blower 5, and the igniter 9 according to a combustion instruction from the outside to control combustion in the burner 1. The control of the fuel pump 3 and the blower 5 linearly changes the fuel flow rate and the blown air amount to linearly change the combustion amount in the burner 1, and the air-fuel ratio during combustion and the air-fuel ratio during ignition are optimized. Is adjusted to. The burner heating controller 10 controls the vaporization tube controller 6 when the combustion device starts to operate.
Controls the blower 5 in parallel when the vaporizer 2 can be vaporized, and heats the burner 1 itself by sending warm air to the burner 1 to heat the burner 1 which has been cooled down, thereby optimizing the combustion environment. To do.

Next, the control of the vaporization cylinder controller 6 and the burner heating controller 10 of the vaporization cylinder controller 6 will be described with reference to FIG. When the operation of the combustion device is started in a state where the temperature of the vaporizer 2 is lower than 200 ° C., the vaporization cylinder controller 6 starts power supply to the vaporization heater 4 for preheating. When the vaporization tube temperature reaches 230 ° C., the blower 5 is controlled to send warm air to the burner 1 and a 5-minute timer (not shown) is started. The vaporization tube controller 6 keeps the vaporization tube temperature high by turning off the power supply to the vaporization heater 4 at 320 ° C. and turning it on at 300 ° C. until the 5-minute timer counts up. When the 5-minute timer counts up, the cold flag is turned off, the blower 5 is turned off, and the vaporization heater 4 is controlled so that the vaporization cylinder temperature becomes 235 ° C. ± 10 ° C. When the vaporization cylinder temperature exceeds 285 ° C., preheating is completed and combustion is possible thereafter. However, while the burner is heating, that is, until the 5-minute timer counts up, the fuel pump 3 is controlled to be larger than during normal ignition,
Performs cold ignition to improve ignitability.

Next, as shown in FIG. 3, when the vaporization tube temperature is 200 ° C. or more and the cold flag is off at the start of the operation, it is determined that the burner 1 is in a hot state and the vaporization heater 4 is controlled to control the vaporization tube temperature. Is controlled to be 235 ° C. ± 10 ° C. However, in this case, when the vaporizing cylinder temperature reaches 225 ° C., preheating is completed and combustion is enabled. Also during ignition, hot ignition is performed in which the fuel pump 3 and the blower 5 are controlled and ignited under normal ignition conditions.

Next, FIG. 4 shows an example of the case of burning during the burner heating sequence. The vaporization cylinder temperature is controlled at 310 ° C. ± 10 ° C. during the burner heating, but is controlled at 285 ° C. ± 10 ° C. when combustion is started. As a matter of course, the vaporization heater 4 is used to vaporize oil during combustion.
The energization rate of is large. Also, at the time of ignition, the fuel pump 3,
The blower 5 is controlled under the cold ignition condition, and is controlled at the optimum air-fuel ratio after the ignition is completed. Since the count of the 5-minute timer remains when the combustion is stopped, the burner heating sequence is continued again, and the burner heating sequence is ended by the count-up of the 5-minute timer. However, during combustion, the temperature rise of the burner during combustion is larger than that during heating by hot air, so the burner heating is performed only at the time of combustion, speeding up the 5-minute timer count, and counting with double the clock. The sequence is further shortened. In FIG. 4, the total burner heating time is shortened from 5 minutes to 4 minutes 30 seconds by 30 minutes by burning for 1 minute.

[0013]

As is apparent from the above embodiments, according to the present invention, the vaporization cylinder controller turns off the cold flag when the vaporization cylinder temperature at the start of operation is equal to or lower than the predetermined cold judgment temperature, and the vaporization heater is used. After controlling the blower and performing a predetermined burner heating sequence, the cold flag is turned off,
When the vaporization cylinder temperature at the start of operation is equal to or higher than the predetermined cold judgment temperature and the cold flag is turned on, the cold flag is turned off after performing the predetermined burner heating sequence in the same manner as described above, and the vaporization cylinder temperature at the start of operation is set to the predetermined value. Since the burner heating sequence is not performed when the cold flag is off when the temperature is above the cold judgment temperature, it is possible to start the blower for heating the burner when the carburetor reaches a predetermined temperature. Save time,
The generation of white smoke and odor during ignition can be significantly reduced.

The vaporizing tube controller controls the vaporization heater at a predetermined heating control temperature, starts a timer when the temperature of the vaporizer reaches a predetermined heating start temperature, controls the blower, and causes the burner to emit warm air. When a predetermined time has elapsed and the timer counts up, the control of the blower is stopped, the burner heating controller is provided for switching the control temperature of the vaporization heater to a vaporizable temperature and turning off the cold flag. Since the heating can be controlled by the vaporizing tube control temperature and the heating time, the preheating time of the vaporizer can be shortened and the generation of white smoke and odor at the time of ignition can be significantly reduced.

Further, when starting the combustion during the burner heating sequence of the burner heating controller, the combustion controller controls the blower and the fuel pump with a control amount different from the control amount after the burner heating sequence is finished and ignites. The burner heating controller switches the count of the timer that measures the burner heating sequence time to a fast count clock during combustion and continues, and when the timer does not count up after combustion is complete, burner heating Since the sequence is continued and the cold flag is turned off when the timer counts up during combustion,
When burning is performed during the heating of the burner, the heating time is corrected by the heating effect of the combustion, so that the heating time of the burner can be shortened.

[Brief description of drawings]

FIG. 1 is a block diagram of a combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a timing chart of an example of a burner heating sequence of the combustion device.

FIG. 3 is a timing chart of another example of the burner heating sequence of the combustion device.

FIG. 4 is a timing chart of another example of the burner heating sequence of the combustion device.

FIG. 5 is a timing chart of a burner heating sequence of a conventional combustion device.

[Explanation of symbols]

 1 burner 2 vaporizer 3 fuel pump 4 vaporization heater 5 blower 6 vaporization tube controller 7 temperature sensor 8 combustion controller 9 igniter 10 burner heating controller

Claims (1)

[Claims] 1. A burner for burning a mixed gas of vaporized liquid fuel and air, a vaporizer for supplying the mixed gas to the burner, and a blower for supplying air to the vaporizer.
A fuel pump for supplying liquid fuel to the vaporizer, a vaporization heater built in the vaporizer, a temperature sensor for detecting the temperature of the vaporizer, an igniter for igniting the burner, the blower and the fuel. A combustion controller that controls the combustion in the burner by controlling the pump and the igniter, and inputs the output of the temperature sensor to control the vaporization heater at a predetermined heating control temperature so that the temperature of the vaporizer is predetermined. When the heating start temperature reaches, the timer is started, hot air is sent to the burner by controlling the blower, and when a predetermined time elapses and the timer counts up, the control of the blower is stopped and the control temperature of the vaporization heater is stopped. And a vaporization cylinder controller having a burner heating controller for turning off a cold flag while switching the vaporization temperature to a vaporizable temperature, and the vaporization cylinder controller is a vaporization cylinder at the start of operation. Temperature is equal to or lower than a predetermined cold judgment temperature, a cold flag is turned on, the vaporization heater and the blower are controlled to perform a predetermined burner heating sequence, and then the cold flag is turned off. When the cold flag is on at the predetermined cold judgment temperature or higher, the cold flag is turned off after performing the predetermined burner heating sequence in the same manner as described above, and the cold flag is turned on when the vaporization cylinder temperature at the start of operation is the predetermined cold judgment temperature or higher. When the burner heating sequence is off, the combustion controller does not perform the burner heating sequence, and when the combustion controller starts combustion during the burner heating sequence of the burner heating controller, the blower and the fuel pump are connected after the burner heating sequence is completed. The burner heating controller controls combustion by controlling the igniter with a control amount different from the control amount. Switches the count of the timer to a fast count clock and continues, and when the timer does not count up after the end of combustion, the burner heating sequence is continued, and when the timer counts up during combustion, the cold flag is turned off. Combustion device.