JPH09170730A - Method for supplying gas fuel to burner for cremation furnace and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effect cremation employing another gas fuel without replacing already installed burners for a cremation furnace when the supply of town gas is stopped for a long period of time due to a disaster such as earthquake or the like in the cremation furnace employing the town gas. SOLUTION: A burner is provided with a fuel supplying system 2 for cremating by gas fuel and an air supplying system 6 for inserting necessary air for combustion while a pressure equilibrium valve 15, controlling the air pressure of the air supplying system 6 so as to be the same pressure substantially as the air pressure in the air supplying system 6 as a loading pressure, is interposed in the fuel supplying system 2 and a flow rate regulating valve 16, regulating the flow rate of the gas fuel in accordance with a calorific power, individual for various kinks of gas fuels, is provided between the pressure equilibrium valve 15 and the fuel port 4 of the burner 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a type of gas fuel when it is necessary to change the type of gas fuel and to cremate when supplying the burner with gas fuel and combustion air. The present invention relates to a method and an apparatus for supplying gas fuel to a burner for a cremation furnace that can be used for cremation by using an existing burner as it is without replacing it with a dedicated burner adapted to.

[0002]

2. Description of the Related Art Particularly, when the city gas is used as a fuel for cremation, the city gas supply may be stopped for a long period of time due to a disaster such as an earthquake. However, since the cremation furnace needs to be quickly processed for cremation due to its nature, it is necessary to urgently switch to another type of gas fuel for cremation. Conventionally, it cannot be directly supplied, and gas fuel, such as LPG, is used after being modified.
In that case, it was necessary to replace the burner body according to the peculiar heat generation amount, or to replace the nozzle provided in the burner.

[0003]

As described above, the work of replacing the burner of the cremation furnace or its nozzle must be entrusted to a professional engineer, and the cremation furnace has at least a burner for the main combustion chamber. It has two burners for the reburn chamber and, in addition, one funeral hall generally has one.
Since it has 0 or more cremation furnaces, it takes a lot of time to replace it, and it is necessary to adjust the replaced burner for each one, and it takes several days to start operation. It was also a heavy financial burden.

In view of the above, the present invention allows an existing burner to be attached, supplies another gas fuel different from the gas fuel normally used for the burner, and enables normal combustion.

[0005]

The solution according to the invention converts the type of gas fuel into a burner for a cremation furnace, which comprises a fuel supply system for delivering gas fuel and an air supply system for delivering air necessary for combustion. During cremation, the flow pressure of the fuel supply system is set to a pressure that is almost the same as the air pressure of the air supply system, and then the flow rate of the gas fuel is controlled according to the calorific value specific to each type of gas fuel. It is characterized by supplying.

Further, the solution according to the present invention is a burner for a cremation furnace comprising a fuel supply system for cremation with gas fuel and an air supply system for inserting air required for combustion, and an air supply system in the fuel supply system. There is a pressure equalizing valve that controls the pressure of the air as a pilot pressure to be approximately the same as the air pressure of the air supply system. It is characterized in that a flow rate control valve for controlling the flow rate of fuel is provided.

Further, the flow rate control valve is closely sandwiched between a pair of flanges connecting the source side and the destination side of the fuel supply system and both sheet packings attached to the respective flanges. It is preferably configured with an orifice plate having a through hole for adjusting the flow rate of gas fuel.

[0008]

According to the above construction, when it becomes necessary to change the gas fuel, the gas pressure to be changed is switched to the gas fuel to be changed, and the flow rate is adjusted according to the calorific value of the gas fuel. Since it is adjusted by the system pressure, it is supplied to the burner at a flow rate suitable for the gas fuel, and proper combustion is performed.

Further, if a flow rate control valve in which the orifice plate is sandwiched between the flanges is attached, even if the orifice plate is accidentally touched during the cremation process, the orifice plate is fixedly sandwiched between the flanges. It is possible to reliably maintain the set state and to supply the predetermined gas fuel without the plate shifting.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Generally, a cremation furnace is provided with a main burner for direct cremation and a sub-burner for further burning unburned gas generated during cremation, and when using gas fuel. A burner of a model corresponding to the type of gas fuel is attached to the.

The present invention utilizes the above existing burners as they are, and each burner has a fuel supply system and an air supply system, and a pressure equalizing valve is provided on the supply side of each fuel supply system. A flow control valve is provided on the supply destination side of the fuel supply system.

The pressure equalizing valve is a valve having a diaphragm for applying a loading pressure, and the loading pressure is based on the air pressure of the air supply system.

The flow control valve is capable of adjusting the cross-sectional area of an existing pipe constituting the fuel supply system from the maximum to the minimum, and the adjustment is provided with an indicator so that the adjustment can be made according to the type of gas fuel to be replaced. It is preferable to keep.

By the way, the heat quantity Q kcal / hv from the burner required for cremation is the heat quantity q kcal / Nm peculiar to various gas fuels.
^It is determined by the gas amount V m ³ / HR emitted from the burner for ³ , and if this is expressed by a mathematical formula,

[0015]

[Formula 1]

## EQU1 ## In the above formula, the heat quantity Q from the burner required for cremation is almost constant regardless of the type of gas fuel used, and the air quantity relative to the combustion heat quantity is also substantially constant. The gas pressure flowing to the fuel supply system is adjusted to be the same or almost the same as the air pressure supplied by the pressure equalizing valve by the air pressure of the supply system,
The flow rate of the gas is adjusted by a flow rate adjusting valve according to the calorific value q peculiar to the gas fuel and is supplied to the burner.

[0017]

[Examples] Explaining more concretely by examples, the cremation furnace is provided with a cremation burner for direct cremation and a reburn burner for burning unburned gas generated at the time of cremation in a separate chamber as described above. Since the structure for supplying the gas fuel and the combustion air to each burner is the same, only one of them will be described, and the same reference numerals are used for the same members in the drawings.

As shown in FIG. 1, the pipe of the fuel supply system 2 extending from the gas fuel supply pipe 1 is connected to the fuel port 4 of the burner 3, while the air port 5 of the burner 3 is connected.
Is connected to a pipe of an air supply system 6 sent by a blower, and a gas flow meter 7 and an opening / closing valve 8 are interposed in the gas fuel supply source pipe 1, and an opening / closing valve 9 is also connected to the pipe of the fuel supply system 2. Intervenes. The pipe of the air supply system 6 is provided with the air control valve 10 manually or automatically, and the above structure is the same as the conventional one. Each burner 3 is attached to the furnace wall 11 of the cremation furnace.

In the above structure, the gas fuel supply pipe 1 is provided with several receiving ports 12 to 14 which can individually receive gas fuel such as city gas, LPG and natural gas.
Therefore, for example, when the city gas is stopped, the receiving port 12 is shut off by the cock, and the other receiving port 13 or 1
4 can be connected so that another gas fuel can be supplied.

Further, a pressure equalizing valve 15 is provided at an intermediate portion of the pipe of the fuel supply system 2, and a flow rate adjusting valve 16 is provided between the pressure equalizing valve 15 and the fuel port 4 of the burner 3.

As described above, the pressure equalizing valve 15 is a valve having a diaphragm for applying a loading pressure, and the loading pressure may be derived from the air supply system 6, but the loading pressure is supplied to the burner 3 at the end side. Most preferred is the induction of air.

As shown in FIGS. 2 and 3, the flow control valve 16 cuts the middle portion of the pipe of the fuel supply system 2,
It is to intervene in the cut position, and is composed of a pair of members in which a flange 18 is integrally provided at one end of the connecting pipe 17 that is inserted into the cut end of the pipe by screwing. The plurality of bolts and nuts 20 are in close contact with each other via the sheet packing 19 described above, and the orifice plate 21 is interposed between both sheet packings 19.
9 is closely attached to prevent gas leakage. The bolts and nuts 20 are provided on the concentric circle of the flange 18 at equal intervals.

The orifice plate 21 is a rectangular metal plate, and is formed to have a length sufficient to project from both ends of the flange 18 when sandwiched between the members, and the width thereof is from FIG. 2 to FIG. As shown in FIG. 2, the bolt nuts 20 are formed so as to be fitted in a state in which they are in contact with each other between the shaft portions having the male threads of the bolt nuts 20 provided above and below. Further, the orifice plate 21 is provided with a through hole 22 having the same inner diameter as that of the connecting pipe 17. However, it is not always necessary to form the same diameter as the inner diameter of the connecting pipe 17 precisely, and it may be slightly larger or slightly smaller.

Further, a scale 23 indicating the degree of opening / closing of the through hole 22 is engraved on a portion of the orifice plate 21 projecting from the flange 18, and a pointer 24 is provided on one flange 18.
The scale 23 and the pointer 24 constitute an instructing section 25 for setting a flow rate according to the type of gas fuel used.

In order to adjust the flow rate with the above orifice plate 21, the bolt nut 20 is loosened and the orifice plate 21 is slid using the shaft portion of each bolt nut 20 as a guide, and the type of gas fuel to be used is switched. By aligning the pointer 24 with the scale 23 corresponding to, the inner diameter of the connecting pipe 17 is narrowed down by the through hole 22. Moreover, when inserting and removing the orifice plate 21,
Since it slides along the shaft portion of each bolt nut 20 as described above, the orifice plate 21 does not tilt, and the reduction ratio of the inner diameter can be accurately set according to the scale 23.

The orifice plate 21 is not limited to the above-mentioned structure, and as shown in FIG. 4, a plurality of through holes 22 having different sizes of large, medium, and small adapted to the gas fuel are provided at intervals in the orifice plate 21. Alternatively, the designated pieces 26 protruding from the flange 18 corresponding to the through holes 22 may be integrally provided in a protruding manner.

As yet another example, as shown in FIG. 5, large, medium and small through holes 2 corresponding to each gas fuel are provided for each plate.
It is also possible to open one 2 and project the designated piece 26 on each plate. In this case, every time the gas fuel is replaced, the orifice plate 21 suitable for the gas fuel is selected according to the designated piece 26. It is sandwiched between both flanges 18. However, in the case of the examples shown in FIGS. 4 and 5, it is necessary to set so that all the opening openings of the through holes 22 are present in the opening openings of the connecting pipe 17. Although not shown so that the setting can be performed accurately from the outside, it is preferable to display a center line on each designated piece 26 and the flange 18.

It should be noted that there are various types of flow rate control valves, as is well known, such as those that are adjusted by turning a handle or those that are automatically adjusted by a solenoid valve. It is very dangerous because it is possible to accidentally touch the valve and change the flow rate.
By mounting the flow rate control valve 16 having the above structure, even if it is accidentally touched, the orifice plate 21 is tightened with the bolt nut 20 and firmly fixed, so that the bolt nut 20 is not loosened and safety is ensured. Is something that can be done.

[0029]

According to the method for supplying gas fuel to the burner for a cremation furnace according to the present invention, the flow pressure of the gas fuel is set according to the air pressure supplied by the burner, and the flow rate according to the calorific value of the gas fuel. Is set and supplied to the burner, so even if there is an unavoidable situation in which the normally used gas fuel is changed to another type, it is necessary to replace the burner one by one with a burner suitable for the gas fuel. It becomes possible to immediately carry out the combustion process with the existing burner attached.

Further, according to the apparatus for supplying gas fuel to the burner for the cremation furnace according to the present invention, the fuel supply system to the burner is provided with the pressure equalizing valve and the flow control valve, and the pressure equalizing valve is provided with the air pressure of the air supply system to the burner. It is possible to achieve the intended purpose only by performing piping that is given as loading pressure.
Further, if this device is provided, in an emergency when gas is stopped, the cremation can be immediately performed by changing the flow rate control valve and adjusting according to the supplied gas fuel.

Furthermore, if the flow rate control valve has an orifice plate sandwiched between both flanges, the orifice plate will not move even if touched by mistake, as long as the connection of both flanges is not released after once adjusted, It is possible to reliably and safely burn the gas fuel used.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a gas fuel supply device for a burner for a cremation furnace according to the present invention.

FIG. 2 is a front view showing a flow rate control valve used in a gas fuel supply system for a burner for a cremation furnace according to the present invention.

FIG. 3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a front view showing a main part of a similar example of a flow rate control valve.

FIG. 5 is a front view showing an orifice plate of (a), (b) and (c) a further example of the flow rate control valve.

[Explanation of symbols]

 2 Fuel supply system 3 Burner 4 Fuel port 6 Air supply system 15 Pressure equalizing valve 16 Flow rate control valve 18 Flange 19 Sheet packing 21 Orifice plate 22 Through hole 25 Indicator

Claims (3)

[Claims] 1. A fuel supply system (2) for cremating with gas fuel
And a cremation furnace burner including an air supply system (6) for inserting air required for combustion, when converting the type of gas fuel to cremation, the flow pressure of the fuel supply system is changed to the air pressure of the air supply system. A method for supplying gas fuel to a burner for a cremation furnace, which comprises controlling the flow rate of the gas fuel according to the specific calorific value of each type of gas fuel after setting the pressure to substantially the same pressure. 2. A fuel supply system for cremating with gas fuel (2)
In a burner for a cremation furnace including an air supply system (6) for inserting air required for combustion, in the fuel supply system, the air pressure of the air supply system is set as a loading pressure and is almost the same as the air pressure of the air supply system. A pressure equalizing valve (15) for controlling the pressure is interposed, and the flow rate of the gas fuel is adjusted between the pressure equalizing valve (15) and the fuel port (4) of the burner (3) according to the heat generation amount peculiar to each type of gas fuel. Flow control valve (16)
A gas fuel supply device for a burner for a cremation furnace characterized by being provided with. 3. A pair of flanges (18) connecting the source side and the destination side of the fuel supply system (2) with the flow rate control valve (16), and both attached to each flange (18). The orifice plate (21), which is closely held between sheet packings (19) and has a through hole (22) for adjusting the flow rate of gas fuel, according to claim 2. Gas fuel supply device for burners for cremation furnaces.