JPH067001B2 - Steam generator - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to instant steam generators.

The present invention provides a simple gas generator unit that does not have a boiler, and is capable of producing steam of various qualities on-site according to various applications.

(Problems to be Solved) For example, the present invention can be applied to harden prestressed concrete or precast concrete, and can be applied to a standard hardening process of concrete products such as blocks and pipes. It can be applied. During the curing of concrete products, maintain a uniform temperature throughout the concrete and keep the concrete surface moist.
It is desirable to maintain the st).

The heat generated by the hardening action of concrete tends to be higher inside the concrete product. By stacking articles such as concrete blocks in a room and spraying steam on them, the two purposes of keeping the blocks at a uniform curing temperature and keeping the concrete surface moist can be achieved at the same time. By hardening the block in this manner, it is possible to obtain concrete having the same strength as the concrete that has been hardened over 28 days within 24 hours.

Instantaneous steam generators are required to produce low levels of carbon monoxide. If the steam generator is operated in a closed room, for example in a facility or facility such as a concrete production plant or a mine, reducing the amount of carbon monoxide produced is necessary to meet the acceptance criteria for carbon monoxide content. , Especially important.

The present invention utilizes a uniquely structured combustion chamber to generate water vapor, which is cooled by circulating water flowing through a jacket provided around the combustion chamber, and the water discharged from the jacket flows to one end of the chamber. It is made to be vaporized by the combustion gas of the burner provided. The device of the present invention is 1980 in that it introduces a water spray in the opposite direction to the flow of combustion gases exiting the combustion chamber.
Different from the device described in U.S. Pat. No. 4211071 issued to Mr. Wyatt on July 8, 2010.

In the case of the device according to the invention, a large turbulence is produced in the area surrounding the water spray, which instantly and sufficiently vaporizes the spray by the combustion gases.

On the other hand, in the conventional Wyatt device, water flows through a jacket around the combustion chamber and is discharged through an annular portion provided around the flame shield. Therefore, water flows simultaneously with the hot gas in the combustion chamber. However, in practice, it turned out that if water simultaneously flows around the flame, the flame becomes unstable and may disappear. As a result, if the place of installation of the generator is poorly ventilated,
The amount of carbon monoxide exceeds the acceptable level. By spraying a water spray on the area of the burner where the flame does not reach, the problem of the flame extinguishing can be solved. The water cooling jacket of the combustion chamber not only eliminates the need for laying refractory material in the chamber, but additionally provides a preheating effect in vaporizing the water.

(Structure) In the steam generator according to the present invention, a combustion chamber is surrounded by a water cooling jacket, and the chamber has an inlet and an outlet for circulating water in the jacket. The combustion chamber has a first end and a second end, and a burner is provided at the first end of the combustion chamber. Means are provided for supplying compressed air and fuel to the burner so that a flame can be generated from the burner toward the second end of the combustion chamber. A water spray nozzle is provided at the second end of the combustion chamber and is spaced from the burner flame. The nozzle is connected to the outlet of the jacket, allowing water to be sprayed in the opposite direction of the hot gas flow from the burner flame. In this way, it is possible to reliably generate steam without extinguishing the flame. An exhaust pipe for carrying the generated vapor is connected to the second end of the combustion chamber. Thus, the present invention is configured to spray water in the opposite direction of the hot gas stream. That is, the water spray nozzle is arranged so as to directly face the burner. It was conventionally thought that water should be sprayed in a direction away from the flame in order to prevent the flame from extinguishing, but the present invention is contrary to this idea.

(Function and effect) In fact, it was found that the steam generation rate was extremely improved by directly spraying water in the direction of the combustion gas emitted from the burner flame. It is believed that this is because the turbulence between the water spray and the hot exhaust gas stream is promoted, so that the heat is instantaneously transferred to the water spray to generate steam. Furthermore, when steam is generated by the apparatus of the present invention, it is surprising that the flame does not extinguish even at a steam generation pressure much higher than that of the conventional apparatus. This is because the water spray is sprayed on a region away from the burner flame, and the water spray does not hinder the burner combustion process. Since the fuel burns without being adversely affected by the water spray of the present invention, the burners attached to the device have sufficiently low levels of carbon monoxide to be suitable for use in enclosed work areas. .

(Embodiment) A preferred embodiment of the present invention will be described below with reference to the drawings.

In the examples, a structure suitable for a burner for natural gas or propane gas is shown.
It should be understood that the structure suitable for the oil burner can be obtained by making appropriate modifications to the air supply means and the fuel supply means.

The steam generator of the present invention has a burner (11) at one end of a combustion chamber (10) and a water spray nozzle (12) at the other end. A water jacket (15) (see FIG. 2) is provided in the chamber (10), and the jacket has an inlet (16) near the lower end of the chamber (10) and an upper portion of the chamber (10), that is, a burner end. A jacket outlet (17) is provided in the vicinity of. Water circulates in the jacket (15) and its circulation speed is controlled by a water pressure controller (19) provided in the water inlet line (20). The water exiting the jacket (15) is sent to the water spray nozzle (12) through the jacket outlet (17) and the pipe (22). The nozzle (12) is provided inside the steam outlet line or the discharge pipe (24). Combustion Chamber (10)
Is sized so that the fuel can be completely burned by the flame of the burner (11) in the space of the chamber (10). In the upper zone (26) of the chamber (10), the burner (1
When the fuel is burned at the maximum capacity of 1), it is desirable to provide a zone (25) for high temperature flue gas in the lower part of the combustion chamber (10).

The burner 11 may be an oil burner, but a burner that burns a compressed gas fuel mixture such as air and natural gas or propane gas is preferred. In the latter case, the burner (11) is provided with an inlet pipe (30). The introduction pipe (30) is provided with a large-diameter air pipe (31) for compressed air, and a small-diameter fuel pipe is included in the large-diameter air pipe.
(32) is joined. Joint (3) between air pipe (31) and fuel pipe (32)
3) is just upstream of the Venturi tube (35). The gaseous fuel mixture passes through the Venturi tube (35) and is thoroughly mixed,
The burner head (11) burns uniformly and the heat output (h
eat output) can be controlled well.

The air drawn through the filter (40)
It is pressurized by passing through (41) or other known compression means, and is supplied to the air introduction pipe (31). Air inlet pipe
The pressure in (31) is regulated using a suitable pneumatic valve (42) and the pressure in fuel tube (32) can be controlled by a conventional fuel valve (43). By adjusting the valves 42, 43, the pressure and composition of the fuel mixture can be varied as needed.

Ignition of the burner (11) can be conveniently performed using a pilot (49) provided near the head of the burner (11). The fuel mixture is sent to the pilot (49) through supply lines (50) (51) connected to the main fuel pipe (32) and the air introduction pipe (31). The supply lines (50) (51) are connected by valves (4
2) Branch from the air pipe (31) and the fuel pipe (32) at a position upstream of (43). The supply lines (50) and (51) are further provided with valves (53) and (54), respectively, so that the combustion gas mixture having a desired pressure is supplied to the pilot (49).

Those skilled in the art will appreciate that the present invention can be achieved with different types of burners. The steam generated by the device according to the invention is burner (11)
Since it is contained in the exhaust gas of the above, it is particularly desirable for the application where a low level of carbon monoxide generated by the burner (11) is required. With the device of the present invention, the carbon monoxide level of the burner (11) is kept low during steam generation. This is because spraying water from the nozzle (12) onto the flame does not extinguish the flame. Furthermore, the description of the fuel supply means and the air supply means is merely an example, and can be changed according to the type of burner used. It will be apparent to those skilled in the art that central control means can be used to create a comprehensive system that balances fuel, air and water flow rates and relative pressures.

The steam sprays the water spray from the water spray nozzle (12) and the hot combustion gases from the burner (11) into the combustion chamber (1
It is generated by mixing at the position of the lower end of (0).
By spraying from the water spray nozzle (12) toward the exhaust gas of the burner (11), the water is vigorously stirred and turbulent with the gas flow and mixed well, so that the water is instantaneously mixed. Evaporate. By providing baffles in the combustion chamber (10) and steam exit line (24), turbulence and mixing conditions can be altered. The amount of steam exiting the steam outlet line (24) can be determined by adjusting the output of the burner (11) and the output of the water spray nozzle (12). Burner (11) and spray nozzle
The relative pressure of (12) must be adjusted so as to evaporate when the hot exhaust gas from the burner (11) comes into contact with water. When using the present invention, relatively low pressures, for example 5 to
20 psi of steam is generated and most of this water vapor is generated in the outlet neck (59) between the lower end of the combustion chamber (10) and the steam outlet line (24).

By utilizing the above-mentioned principle of the present invention, it is possible to generate steam having a pressure much higher than that of the conventional direct-fired generators. The disclosure of the preferred embodiments described above does not limit the scope of the invention defined in the claims to these embodiments.

[Brief description of drawings]

FIG. 1 is a partially exploded, partially cutaway perspective view of the generator of the present invention, and FIG. 2 is a longitudinal sectional view of a combustion chamber and related elements. (10)… Combustion chamber, (11)… Burner (12)… Water spray nozzle, (15)… Water jacket (24)… Steam discharge pipe, (31)… Air supply pipe (32)… Fuel supply pipe (50) )… Air supply line (51)… Fuel supply line

Claims (1)

[Claims] 1. A combustion chamber having a circulating water inlet and a circulating water outlet for circulating water, and a combustion chamber having first and second ends, and a first end of the combustion chamber. The burner provided and a means for supplying compressed air and fuel to the burner in order to generate a flame from the burner toward the second end of the combustion chamber, and a circulating water outlet, which are connected to the circulating water outlet, to prevent steam from extinguishing the flame It was placed at the second end of the combustion chamber away from the burner flame to allow it to be generated, allowing water to be sprayed in the opposite direction of the hot gas flow from the burner flame. A steam generator comprising: a water spray nozzle; and a discharge pipe connected to the second end of the combustion chamber for carrying generated steam. A generator as claimed in claim 1 provided at the first end of the combustion chamber and comprising a pilot for supplying a burner pilot flame. The means for supplying air and fuel to the burner includes a blower for compressing air in the atmosphere, an air supply pipe connected between the blower and the burner, and a fuel supply pipe connected to the air supply pipe. A generator as claimed in claim 1, comprising: A pilot provided at a first end of the combustion chamber for supplying a pilot flame of a burner, an air supply line for connecting an air supply pipe to the pilot, and a fuel supply line for connecting the fuel supply pipe to the pilot A generator as claimed in claim 3 having: Each of the air supply pipe, the fuel supply pipe, the air supply line and the fuel supply line is equipped with a control valve, and the control valve of the air supply pipe is located at the downstream side of the connection part of the compressed air supply line, The generator according to claim 4, wherein the control valves are respectively provided downstream from the connection portion of the fuel supply line. The water inlet of the water jacket is provided near the second end of the combustion chamber, the water outlet of the water jacket is provided near the first end of the combustion chamber, and the water in the water jacket is burned. The generator according to claim 1, wherein the generator is adapted to flow in a direction opposite to the flow of the hot gas in the chamber. A generator as claimed in claim 1 in which the water spray nozzle is arranged in a discharge pipe provided at the second end of the combustion chamber. The spray nozzle is disposed in the discharge pipe at the second end of the combustion chamber, and the water sprayed from the spray nozzle in a direction opposite to the flow of the hot gas is brought into contact with the hot gas to cause the spray nozzle to move substantially in the discharge pipe. The generator according to claim 1, which is constructed so that all water can be vaporized.