JP3007843B2 - Fast boiler steaming method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-speed steam boiler that can start steam generation in a short time.

[0002]

2. Description of the Related Art A steam having a certain pressure or more is supplied, for example, a steam is supplied to a defrosting device that defrosts by injecting steam into frozen food. In the case of a boiler in which combustion is performed within the furnace to return the steam pressure to a predetermined pressure, even if combustion starts immediately after the steam pressure decreases, it takes time for the steam pressure to return, and work must be continued. In some cases, the steam supply was too late to work. For the above applications, a high steam pressure is not required, and a boiler that can recover the steam pressure in a short time is desired, but in order to generate steam, it is necessary to first heat the water temperature to the boiling point. Since it takes a long time to generate steam, the steam pressure cannot be restored in a short time.
In addition, when keeping the canned water temperature high by always burning, it does not take long time to generate steam,
In that case, wasteful heating increases and efficiency is reduced, which is not practical.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a high-speed steaming method for a boiler capable of generating steam in a short time without lowering the efficiency.

[0004]

An upper header and an lower header are arranged at an upper portion and a lower header is connected to the upper and lower headers by a large number of water tubes, and a side of a water tube group formed by a large number of water tubes. A burner that generates a flame toward the water tube group is provided in the part,
The flame generated by the burner intersects with the water pipe.The water supply to the boiler connects the steam section at the top of the boiler and the underwater section at the bottom of the boiler, and detects the water level provided at the height between the upper header and the lower header. In a boiler that keeps the water level at the set water level by performing in accordance with the signal detected by the cylinder, when the height of the set water level is H1, and the height at the middle point of the perpendicular line connecting H1 and the upper end of the lower header is H2. The burner is provided at a portion sandwiched between H1 and H2 to intensively heat the can water near the water surface in the water pipe.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. An upper header 1 and a lower header 2 are connected by a number of vertical water pipes 3, a water pipe group is surrounded by a furnace wall 10, and a burner 4 is provided on one side of the furnace wall 10. Water pipe 3
Are arranged in a staggered manner in a portion surrounded by a furnace wall 10, and the burner 4 is provided with a mixing chamber 7 for mixing combustion air and fuel gas before the combustion surface 6. The water level of the boiler is detected by a water level detecting cylinder 8 communicating with the upper header 1 and the lower header 2 by a communication pipe, and the set water level is maintained by supplying water according to a detection signal from the water level detecting cylinder 8. It is.
The water surface in the water pipe 3 is flat and separates into a canned water portion and an air portion when the burner 4 is stopped burning, but when the burner 4 is burning, air bubbles are generated in the canned water, and Since the cans are lifted, the can water reaches the upper part of the water pipe 3 to prevent overheating of the upper part of the water pipe 3. The water surface position in the water pipe 3 when the combustion is stopped is the set water level of the boiler, and the height of the set water level is H1,
A height corresponding to a midpoint of a perpendicular line connecting H1 and the upper end of the lower header 2 is defined as H2, and a burner 4 provided on one side of the furnace wall 10 is provided at a portion sandwiched between H1 and H2. Lower header 2
Is connected to the water supply pipe 5, and the upper header 1 is connected to the steam take-out pipe 9.

The steam is generated by heating the water pipe 3 by burning the burner 4. When the fuel gas and the combustion air are introduced into the mixing chamber 7 of the burner 4, they are mixed in the mixing chamber 7 to become a premixed gas, and the premixed gas is injected from the combustion surface 6 toward the water pipe group. By emitting a spark toward the combustion surface 6, the premixed gas injected from the combustion surface 6 is ignited, and a flame burning toward the water tube group is generated.
The flame from the combustion surface 6 intersects with the water pipe 3 and contacts the water pipe 3 to heat the water in the water pipe and generate steam. The generated steam is sent from the water pipe 3 to the upper header 1, and is taken out through the steam take-out pipe 9.

When a burner is provided in a lower portion of the water in the water pipe and the lower water is heated, steam is not generated until the temperature of the whole water in the water pipe rises, and the entire water in the water pipe is not heated. It takes a long time to raise the temperature. In addition, when the burner 4 is provided on the upper part of the water pipe and the upper part of the water pipe is heated, or when the upper part of the water pipe and the lower part of the water pipe are simultaneously heated by the burner having a long heating surface, bubbles are generated in the can water. Until the can water is lifted, there is a problem that a portion of the upper part of the water pipe that is not in contact with the can water is overheated. However, if the burner is installed in the portion between H1 and H2 and the upper part of the water in the water pipe is heated, the temperature of the water in the upper part of the water pipe rises rapidly, and the temperature of the water in the upper part rises to the boiling point. When it reaches, even if the water temperature in the lower part of the water pipe is low, steam starts to be generated, so that the steam can be supplied in a very short time and the water pipe is not overheated because the part lower than the water surface is heated.

[0008]

According to the present invention, the time from the start of combustion to the generation of steam can be greatly shortened without lowering the efficiency and without overheating the water pipe, thereby improving work efficiency. Can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of the present invention.
Sectional view of part A

FIG. 2 is a sectional view taken along the line BB of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper header 2 Lower header 3 Water pipe 4 Burner 5 Water supply pipe 6 Combustion surface 7 Mixing chamber 8 Water level detection cylinder 9 Steam extraction pipe 10 Furnace wall H1 Height of set water level H2 Middle point of a vertical line connecting lower header and lower header Height

Claims (1)

(57) [Claims] 1. An upper header and an lower header at an upper portion, and a plurality of water tubes are connected between upper and lower headers.
A burner that generates a flame toward the water pipe group is provided on the side of the water pipe group formed by a number of water pipes, and the flame generated by the burner intersects with the water pipe.The water supply to the boiler is supplied to the steam section at the top of the boiler. In the boiler that maintains the water level at the set water level by connecting the underwater part of the boiler and the underwater part according to the signal detected by the water level detection cylinder provided at the height between the upper header and the lower header. Height is H1,
Assuming that the height corresponding to the midpoint of a perpendicular line connecting H1 and the upper end of the lower header is H2, the burner is provided in a portion sandwiched between H1 and H2, and the can near the water surface in the water pipe between H1 and H2. By intensively heating the water, the temperature of the upper part of the water inside the water pipe is raised more rapidly than the lower part of the water inside the water pipe, so that steam can be generated even if the water temperature in the lower part of the water pipe is low. High-speed boiler steaming method.