JPH031566B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a liquid fuel combustion device that evaporates liquid fuel and burns gas premixed with air at a flame opening.

Conventional structure and its problems Conventionally, this type of liquid fuel combustion device has a heater embedded in the lower part of the vaporizer, and a ventilation passage connected to the blower on the side wall of the vaporizer and a fuel capillary with a nozzle-shaped tip. It is shown connected to the fuel pump.
A combustion section is provided which is connected to the vaporizer and has a flame port. Fuel is supplied from the tank by the combustion pump to the vaporizer through the fuel tube, where it is gasified on the high-temperature wall, mixed with air, and combusted at the flame port of the combustion section.
In this combustion state, the outflow speed of the fuel gas flowing out from the flame port and the combustion speed are balanced at the flame port, and the flame surface is stably held and combustion is sustained. The amount of combustion was controlled by adjusting the blower and fuel pump to increase or decrease the amount of air and fuel flow in response to fluctuations in the heating and other loads. However, since the area of the flame opening in the combustion part is constant, if the amount of combustion exceeds a certain level, the flame will lift, producing gas, CO, and odor, and if the amount of combustion falls below a certain level, the flame surface will become pale. Because the temperature of the flame section did not rise to a high enough temperature, a portion of the flame front disappeared, producing gas, CO, and odor. Also, when the ratio of fuel and air changes,
In addition to the gas, CO, and odor, the flame approached the flame mouth and overheated the flame mouth, causing thermal deformation. Therefore, the variable range of combustion amount that can maintain good combustion is limited.

The method of separately providing multiple burners with different combustion volumes was difficult to use in practice due to the timing of combustion switching and the generation of odor during ignition and extinguishing.

OBJECTS OF THE INVENTION An object of the present invention is to expand the variable range of combustion amount by keeping the flame port load constant.

Structure of the Invention The present invention provides a plurality of partitioned vaporization chambers, each of which is provided with a combustion section in communication with the other, and these combustion sections are provided in contact with each other, and another combustion section is provided in the wake of the flame generated in at least one combustion section. By arranging the flame openings in such positions, it is possible to change the flame opening area according to the increase or decrease in the amount of combustion with good flame propagation, and to stabilize the flame by keeping the flame opening load constant.

Description of examples Hereinafter, an explanation will be given based on one embodiment of the present invention.

In the figure, a bottomed vaporizer 1 is separated into two vaporization chambers 3a and 3b by a partition wall 2, a heater 4 is embedded in the circumferential direction of the side surface, and a mixing plate having an aperture shape on the open surface. 5a and 5b are installed. Furthermore, the wall of the vaporizer 1 has ventilation passages 6a, 6.
a fuel capillary tube 8 whose tip constitutes a nozzle together with an air supply means comprising a blower 7 via b;
a, 8b to the vaporization chamber 3 through the ventilation passages 6a, 6b.
a, 3b, respectively, and these fuel thin tubes 8a,
The other end of 8b is connected to the fuel tank 1 via the fuel pump 9.
0 to constitute fuel supply means. The ventilation passage 6b is provided with a constriction part 11 in the middle, and its end is connected to the ventilation passage 6a. A passage opening/closing valve 12 is provided in the middle of the fuel thin tube 8b, and its end communicates with the fuel thin tube 8a, thereby forming means for controlling air and fuel. The upper part of the vaporizer 1 has rectifier cylinders 14a and 14b formed in a cylindrical shape and has a large number of pores 13 along the circumferential direction, and the rectifier cylinder 14.
Combustion sections 16a and 16b made of wire mesh are provided around the combustion chambers a and 14b through rectification spaces 15a and 15b, and the upper ends of the combustion sections 16a and 16b are closed by a closing plate 17. And the combustion part 16a,
An outer cylinder 19 is provided around the combustion chamber 16b through a combustion space 18 whose one end is closed by a closing plate 17, the other end of this outer cylinder 19 is covered with a support cylinder 20, and the combustion gas is provided in this support cylinder 20. The spout 21 constitutes a passageway for flowing to the outside. The rectifying tube 14 is the partition tube 22
The combustion chambers 3a and 3b are separated into two parts and separated, and separate communication parts are formed from the vaporization chambers 3a and 3b to the combustion parts 16a and 16b,
The combustion section 16a and the combustion section 16b are provided in contact with each other, and the combustion section 16b is provided in the wake of combustion gas discharged from the combustion section 16a.

Next, the operation will be explained. By energizing the heater 4 in the vaporizer 1, the vaporization chamber 3a,
3b is heated and the temperature rises. After this, the ventilation passage 6
Combustion air is introduced into the vaporization chambers 3a, 3b by driving a blower 7 provided through the air blowers 7a, 6b. Next, the fuel pump 9 is driven to suck fuel from the fuel tank 10, and the fuel tube 8a,
Fuel is supplied from the tip nozzle part 8b to the vaporization chambers 3a and 3b.
It is squirted inside. The ejected fuel becomes granular, collides with the walls of the vaporization chambers 3a and 3b, receives heat from the high-temperature walls and becomes vaporized gas, which is then transferred to the mixing plate 5 disposed at the top.
a, 5b, and the rectifier tubes 14a, 14.
Flows to b. At this time, the vaporized fuel gas is mixed with combustion air, flows out as a premixture from around the combustion parts 16a and 16b arranged with wire mesh, and is combusted between the outer cylinder 19 and the combustion parts 16a and 16b. ignited by an igniter (not shown) in the space 18;
A combustion flame is formed on the surface of the wire mesh (combustion parts 16a, 16b). Combustion air sent from the blower 7 is controlled by a throttle section 11 to a ratio corresponding to the combustion sections 16a, 16b. Further, the on-off valve 12 directs the fuel supplied by the fuel pump 9 to the combustion sections 16a and 16.
Flow resistance adjustment to control the distribution to the combustion section 1
Control is performed to turn on and off the supply of fuel to 6b. Therefore, the fuel and air are transferred to the combustion parts 16a, 16
b can be individually controlled and supplied. That is, when the amount of combustion is large, the on-off valve 12 is opened. A fuel pump 9 and a blower 7 supply fuel and air according to the amount of combustion.
is supplied to each vaporization chamber 3a, 3b by
The vaporized fuel gas is transferred to the mixing cylinders 5a, 5b and the rectifying cylinder 1.
4a, 14b and burns in the entire area of the wire gauze of the combustion sections 16a, 16b. When the amount of combustion is small, the on-off valve 12 is closed and the fuel is transferred from the vaporization chamber 3a to the combustion section 16.
It is supplied only to a. The amount of fuel and air supplied to the combustion section 16a is the same as when the combustion amount is large, and the flame is formed only in the upper part of the combustion section. Therefore, when the amount of combustion is large, the area of the flame port made up of the combustion part is large, and when the amount of combustion is small, the area of the flame port is small. In other words, the flame outlet load becomes a constant value, and the outflow velocity can be stably maintained at a level corresponding to the combustion velocity. For this reason, the flame does not undergo lifting due to the fast outflow speed, and does not cause flame pulsation, backlash, flame loss, etc. due to the slow outflow speed.
In addition, since the flame opening area can be set to be large or small depending on the amount of combustion, there is plenty of room for changes in the fuel-air ratio caused by changes in fuel and air, and there is no gas odor. There is no deformation caused by red heat in the mouth. By changing the ratio of the combustion parts, the combustion amount can be significantly reduced while maintaining good combustion. For example, combustion parts 16a, 16b
If the ratio is 1:3, the large combustion amount is 4000kcal/h
When set to , the small combustion amount when the on-off valve 12 is closed is
Even if it is set to 1000 kcal/h, the flame port load is the same value, the flame formed on the wire mesh is the same, and the TDR is 4.
The amount of combustion can be varied by a factor of 1/2. The combustion parts 16a and 16b are provided in contact with each other, and the combustion part 16 is placed in the wake of the flame generated in the combustion part 16a.
b, the combustion part 16b is easily ignited by the ignition from the combustion part 16a, and the combustion part 16b is easily ignited due to the ignition from the combustion part 16a. 16b
The gas generated during ON-OFF is burned and does not leak outside.

Effects of the Invention The present invention provides a plurality of partitioned vaporization chambers, each of which is provided with a combustion section in communication with the other combustion chambers, and these combustion sections are provided in contact with each other. By arranging them in the same position, stable combustion can be maintained even when the combustion amount is varied, without changing the flame port load or causing odor due to unused gas, making it possible to greatly adjust the combustion amount, making it possible to achieve comfort and energy savings. Since the flame port load can be set for each of the large and small combustion amounts, stable combustion can be obtained. Therefore, it is possible to realize a NO _x burner with a small flame port load and a low set flame temperature.

[Brief explanation of the drawing]

The figure is a sectional view showing one embodiment of the present invention. 1... vaporizer, 3a, 3b... vaporization chamber, 7...
Blower, 9...fuel pump, 11...throttle section, 1
2...Opening/closing valve, 16a, 16b...Combustion section.

Claims (1)

[Claims] 1. A vaporizer partitioned into a plurality of vaporization chambers, a means provided in the vaporizer and for supplying fuel and air to each of the vaporization chambers, and a means for controlling this supply, and a means provided in the vaporizer and provided in each vaporization chamber. A liquid combustion device comprising: a plurality of combustion sections that are partitioned to communicate with each other; the combustion sections are provided in contact with each other; and the flame holes of other combustion sections are positioned in the wake of the flame generated in at least one combustion section. .