JP4520326B2 - Gas supply device - Google Patents

Description

  The present invention relates to a gas supply device for supplying gas to a combustion device, for example.

  2. Description of the Related Art Conventionally, a combustion apparatus that uses a mixed gas of fuel and air as a fuel has been used for, for example, a water heater and a heater. In a combustion apparatus, it is particularly important to promote mixing of fuel and air as a technique indispensable for improving combustibility.

  In the combustion apparatus, the premixed combustion method in which the fuel and the air are mixed in advance can increase the combustion load as compared with the diffusion combustion method in which the air and the fuel are mixed for the first time downstream of the burner (combustor). . When the combustion load is increased, a large amount of fuel can be combusted in a small combustion space, so that the combustion apparatus can be reduced in size.

  Also, in a combustion device, in order to maintain good ignition and combustion state, it is important that the entire air ratio including a local portion is within a predetermined range. A ratio of about 1.2 to 1.8 is considered good.

  By the way, when supplying a gas such as air or fuel to the combustion device, if the pulsation of the gas is large, even if it is within the air ratio range in terms of time average or overall space, it may be short time or local space. If it sees, it will be outside the combustion range, ignitability and combustibility will deteriorate, and even if it does not ignite or even if it ignites, it will be highly likely that it will cause a situation where it cannot be continued and misfires. For this reason, for example, exhaust gas containing a large amount of CO and THC unburned emissions is discharged outside the combustion apparatus, causing not only a decrease in combustion efficiency, but also a problem of greatly impairing environmental performance.

Conventionally, liquid combustion is more difficult to maintain in the combustion state than gas combustion, and in order to suppress the pulsation of liquid fuel and to stabilize and improve the combustibility, the buffer function for preventing pulsation in the fuel supply nozzle Has been proposed (for example, see Patent Document 1).
JP 11-2111015 A

  In the above-described prior art documents, a structure for suppressing the pulsation of the liquid fuel is proposed. However, even in gas combustion, it has been confirmed that the pulsation of the supplied air or fuel gas causes unignition or misfire and impairs combustibility. In particular, when the blower or fan for supplying air or gas has a structure with a large pulsation such as a diaphragm type or bellows type, it becomes more difficult to stabilize the combustibility.

  In order to prevent these pulsations, it is generally considered from experience that a buffer tank and a pressure loss element (orifice member) are provided before and after the fan or blower. However, it is practical to simply provide one of them. The effect is not obtained. Specifically, since the buffer tank requires an installation space, when an effective buffer tank is provided, a considerable installation space is required. Further, when the pressure loss element is provided, since the gas supply flow rate is suppressed, it is necessary to increase auxiliary power for supplementing the gas supply flow rate.

  Accordingly, an object of the present invention is to provide a gas supply device capable of minimizing the buffer tank installation space, ensuring a gas supply flow rate without increasing auxiliary power, and effectively suppressing pulsation of supplied gas. Is to provide.

  According to the present invention, it is possible to minimize the buffer tank installation space, secure the gas supply flow rate without increasing the auxiliary power, and effectively suppress the pulsation of the supplied gas. Therefore, for example, when applied to a combustion apparatus, it is possible to improve ignition performance and combustion performance.

  An aspect of the present invention uses a buffer tank and an orifice member (pressure loss element) particularly in a gas supply apparatus that supplies gas (fuel gas, air, etc.) to a combustion apparatus or the like, and pulsation of a blower (or fan) is large. Even in this case, the gas supply device can effectively suppress the pulsation of the supplied gas.

A gas supply device according to an aspect of the present invention is disposed on an upstream side, which is a gas inflow side, and a gas flow meter for measuring the flow rate of the gas, and an inlet side is disposed on the downstream side of the gas flow meter. The pressure loss means to which the gas is supplied via the inlet side, and the inlet side is disposed at the outlet side of the pressure loss means, and the gas supplied from the pressure loss means via the inlet side is accumulated. And a blower means that is disposed on the outlet side of the buffer tank and sends the gas from the buffer tank to the downstream side .

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing a main part of a combustion apparatus including a gas supply apparatus according to the first embodiment.

This combustion device is introduced (there may be collectively less gas) 10 air or fuel gas, a blower supplies the lower stream side (or fan, is hereinafter blower hereinafter) 1 and the burner unit (combustor ) 5.

  Further, in this combustion apparatus, a buffer tank 2, a pressure loss element (orifice member) 3, and a gas flow meter 4 are arranged in series in the downstream direction with the blower 1 as the upstream side. The gas 10 supplied from the blower 1 is a fuel gas such as city gas or LPG (liquefied natural gas) other than air. The blower 1 is, for example, a diaphragm type or a bellows type.

  The burner unit 5 is a combustor of a hot water heater, for example, and is supplied with the gas 10 that has passed through the blower 1. When the gas 10 to be supplied is air, the burner unit 5 mixes it with fuel gas of another system and performs combustion. When the gas 10 is a fuel gas, the burner unit 5 mixes it with air of another system and performs combustion.

  For example, as shown in FIG. 3, the buffer tank 2 has a space for storing the gas 10, and includes an inlet side pipe 2 a for allowing the gas 10 to flow in and an outlet side pipe 2 b for allowing the gas 10 to flow. Have. Here, the inlet side pipe 2 a and the outlet side pipe 2 b are arranged such that their center lines are on the same center line 30 and face each other inside the tank 2.

  The pressure loss element 3 is an element that lowers the flow pressure of the gas 10 and is a pipe provided with an orifice member that reduces the gas flow rate. The gas flow meter 4 measures the flow rate of the gas 10 supplied to the burner unit 5.

  Hereinafter, the function and effect of this embodiment will be described.

  The introduced gas 10 is supplied by the blower 1 to the downstream buffer tank 2 and further to the downstream pressure loss element 3.

  Here, for example, the diaphragm-type blower 1 has a relatively large pulsation, and therefore, there is a high possibility that a large pulsation also occurs in the supplied gas 10. In this embodiment, since the buffer tank 2 is provided, the pulsation of the gas 10 is reduced. Furthermore, the pulsation of the gas 10 is further reduced by the pressure loss element 3 connected to the outlet side pipe 2 b of the buffer tank 2.

  As a result, when the gas flow meter 4 arranged on the downstream side thereof is particularly susceptible to pulsation, such as a mass flow meter, the pulsation of the gas 10 is greatly reduced. The effect which can control the influence wheel by pulsation is large.

  FIG. 2 is a diagram showing the characteristics of the supply gas flow rate of the gas 10 with respect to the output of the blower 1 based on the arrangement relationship between the buffer tank 2 and the pressure loss element 3 when the gas 10 is air. If the pressure loss element 3 is arranged downstream of the buffer tank 2 as in the present embodiment, the pressure loss element 3 is arranged upstream of the buffer tank 2 as the supply gas flow rate characteristic 200. In comparison with the characteristic 210 in the case of the above, a result that the flow rate of the supply gas is increased is obtained.

This is because the pulsation is greatly reduced in the buffer tank 2 in the configuration of the present embodiment, so that the pressure loss increase (decrease in gas flow rate) in the pressure loss element 4 is relatively small, and the auxiliary power is increased. This is because a sufficient gas supply amount of air or fuel can be secured. Further, on the lower stream side of the buffer tank 2, since the pressure drop element 3 having the function of the pulsation reduction is configured to be disposed, it is possible to relatively reduce the volume of the buffer tank 2. Therefore, the installation space for the buffer tank 2 can be minimized.

  Moreover, if it is the structure of this embodiment, since the gas flowmeter 4 is arrange | positioned in the position away from the blower 1, since the influence of a pulsation is small, it can measure the flow volume of the gas 10 more correctly. It becomes.

  In short, since the pulsation generated in the gas 10 supplied by the pulsation of the blower 1 can be greatly reduced with the gas supply device of this embodiment, the mixing ratio of air and fuel in the combustion device is particularly stable. Can be Therefore, when applied to a combustion apparatus, the combustion can be stabilized as a result, and the ignition performance and combustion performance can be improved. Moreover, in the gas supply device having the gas flow meter (air flow meter) 4, the pulsation of the gas 10 can be reduced, so that the measurement accuracy of the flow meter 4 can be relatively increased.

(Second Embodiment)
FIG. 4 is a block diagram illustrating a main part of a combustion apparatus including a gas supply apparatus according to the second embodiment. In addition, about the same element shown in FIG. 1, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  In the configuration of this embodiment, the gas flow meter 4, the pressure loss element 3, the buffer tank 2, and the blower 1 are arranged in series in the downstream direction as the upstream side.

  The configuration of this embodiment is effective, for example, when applied to a hydrogen recycle desulfurizer of a fuel cell system in which a fuel gas (for example, hydrogen gas) 40 needs to be recycled to the blower 1.

  That is, the pressure loss element 3 lowers the pressure on the inlet side of the blower 1 and is therefore preferably arranged on the upstream side. On the other hand, when the buffer tank 2 is closer to the blower 1, the amount of gas supplied to the burner unit 5 can be relatively increased (see FIG. 2). Here, when the arrangement relationship between the pressure loss element 3 and the buffer tank 2 is reversed, the pulsation of the blower 1 is directly received by the pressure loss element 2, which is not desirable because the pressure loss increases and the supply gas flow rate decreases. .

  Further, as in the first embodiment shown in FIG. 1, the gas flow meter 4 can measure the gas flow rate more accurately with less influence of pulsation when it is arranged at a position further away from the blower 1.

  In short, since the gas supply device according to the present embodiment has a configuration in which the pressure loss element 3 having a function of reducing pulsation is disposed on the upstream side of the buffer tank 2 as in the first embodiment. The volume of the buffer tank 2 can be made relatively small, and the installation space for the buffer tank 2 can be minimized. Further, since the pulsation is greatly reduced in the buffer tank 2, the pressure loss increase (decrease in the gas flow rate) in the pressure loss element 4 is relatively small, and sufficient gas of air or fuel is obtained without increasing the auxiliary power. This is because the supply amount can be secured.

  In particular, when applied to a combustion apparatus such as a hydrogen recycle desulfurizer that recycles the fuel gas 40 to the blower 1, the effect of improving the ignition performance and the combustion performance is effective.

(Third embodiment)
FIG. 5 is a diagram illustrating the structure of the buffer tank 2 according to the third embodiment. The configuration of the gas supply device of this embodiment is the same as that of the first embodiment shown in FIG. 1 or the second embodiment shown in FIG.

  The buffer tank 2 according to this embodiment is arranged such that the inlet side pipe 2a and the outlet side pipe 2b are not on the same center line 30 and do not face each other inside the tank 2. That is, in the tank 2, there is an overlapping section where the pipes 2a and 2b intersect.

  With such a structure, since the pulsation of the gas 10 flowing from the inlet side pipe 2a is not directly transmitted to the outlet side pipe 2b, the effect of suppressing the pulsation becomes remarkable. On the other hand, in the structure of the buffer tank 2 as shown in FIG. 3, since the inlet side pipe 2a and the outlet side pipe 2b are opposed to each other inside the tank 2, the pulsation of the gas 10 flowing into the buffer tank 2 is achieved. Is easily transmitted to the outlet side pipe 2b as it is. For this reason, unless the volume of the buffer tank 2 is relatively increased, the effect of suppressing the pulsation is small.

  In other words, with the structure of the buffer tank 2 of the present embodiment, it is possible to relatively greatly reduce the tank volume. Specifically, the pulsation can be significantly reduced when the volume of the buffer tank 2 is 500 cc / min or less when the ratio of “supply gas amount / buffer tank volume” is 500 cc / min or less.

(Modification 1)
FIG. 6 is a diagram illustrating the structure of the buffer tank 2 according to a modification of the third embodiment. Since the configuration of the gas supply device is the same as that of FIG. 1 or FIG. 4 as in the case of the third embodiment described above, detailed description thereof is omitted.

  In the structure of this modification, as shown in FIG. 6, in the tank 2, the inlet side pipe 2 a and the outlet side pipe 2 b are not on the same center line 30 and are arranged so as not to face each other. That is, in the tank 2, there is an overlapping section where the pipes 2a and 2b intersect. On the other hand, outside the tank 2, the inlet side pipe 2 a and the outlet side pipe 2 b are arranged on the same center line 30.

  Even in the case of such a structure, the same effect as in the case of the third embodiment described above can be obtained.

(Modification 2)
FIG. 7 is a diagram illustrating the structure of the buffer tank 2 according to a modification of the third embodiment. The configuration of the gas supply device is the same as that in the case of the first embodiment described above (FIG. 1), and thus detailed description thereof is omitted.

  As in FIG. 5, the structure of this modification is arranged such that the inlet side pipe 2 a and the outlet side pipe 2 c are not on the same center line 30 and do not face each other inside the tank 2. That is, in the tank 2, there is an overlapping section where the pipes 2a and 2c intersect.

  The outlet side pipe 2c has a structure having a pressure loss element (orifice member) in the pipe. Thereby, the pressure loss element 3 as shown in FIG. 1 can be omitted, and a structure in which the buffer tank 2 and the pressure loss element 3 are integrated can be realized.

  In the case of such a structure, the same effect as in the case of the third embodiment can be obtained.

(Modification 3)
FIG. 8 is a diagram illustrating the structure of the buffer tank 2 according to a modification of the third embodiment. The configuration of the gas supply device is the same as that in the case of the second embodiment described above (FIG. 4), and detailed description thereof is omitted.

  As in FIG. 5, the structure of this modification is arranged such that the inlet side pipe 2 c and the outlet side pipe 2 b are not on the same center line 30 and do not face each other inside the tank 2. That is, in the tank 2, there is an overlapping section where the pipes 2c and 2b intersect.

  The inlet side pipe 2c has a structure having a pressure loss element (orifice member) in the pipe. Thereby, the pressure loss element 3 as shown in FIG. 4 can be omitted, and a structure in which the buffer tank 2 and the pressure loss element 3 are integrated can be realized.

  In the case of such a structure, the same effect as in the case of the third embodiment can be obtained.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

It is a block diagram which shows the principal part of the combustion apparatus containing the gas supply apparatus regarding the 1st Embodiment of this invention. The figure for demonstrating the characteristic of the air flow rate with respect to the blower output regarding this embodiment. The figure for demonstrating the structure of the buffer tank regarding this embodiment. It is a block diagram which shows the principal part of the combustion apparatus containing the gas supply apparatus regarding 2nd Embodiment. The figure for demonstrating the structure of the buffer tank regarding 3rd Embodiment. The figure for demonstrating the structure of the buffer tank regarding the modification of 3rd Embodiment. The figure for demonstrating the structure of the buffer tank regarding the modification of 3rd Embodiment. The figure for demonstrating the structure of the buffer tank regarding the modification of 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Blower (fan), 2 ... Buffer tank, 3 ... Pressure loss element (orifice member),
4 ... Gas flow meter, 5 ... Burner part, 2a (2c) ... Inlet side pipe,
2b (2c)-outlet side pipe.

Claims (7)

A gas flow meter arranged on the upstream side, which is the gas inflow side, for measuring the flow rate of the gas;
A pressure loss means in which an inlet side is disposed downstream of the gas flow meter, and the gas is supplied through the inlet side;
A buffer tank for storing the gas supplied from the pressure loss means via the inlet side, the inlet side being disposed on the outlet side of the pressure loss means;
A gas supply device, comprising: a blower unit disposed on the outlet side of the buffer tank and sending the gas from the buffer tank to the downstream side . A gas flow meter disposed on the upstream side, which is the gas inflow side, for measuring the flow rate of the gas;
A buffer tank having a structure in which an inlet side is disposed on the downstream side of the gas flow meter, the gas supplied through the inlet side is accumulated, and pressure loss means is incorporated in the inlet side;
A gas supply device, comprising: a blower unit disposed on an outlet side of the buffer tank and sending the gas from the buffer tank downstream. The buffer tank is
2. The gas supply device according to claim 1, wherein the inlet side and the outlet side are arranged to face each other such that center lines of the hollow portions through which the gas flows are coincident with each other. . The buffer tank is
Claim 1, said inlet side and said outlet side, inside of the buffer tank, the gas is characterized in that it is arranged so as not to face each other off-center line of the respective hollow portions flowing Or the gas supply apparatus of any one of Claim 2 . The buffer tank is
The inlet side and the outlet side are shifted from the center line of each hollow part through which the gas flows inside the buffer tank, and the center line of each hollow part coincides with the outside of the buffer tank. The gas supply device according to claim 1, wherein the gas supply device is arranged in a vertical direction. 3. The gas according to claim 1 , wherein the volume of the buffer tank is set based on a ratio to a flow rate of the gas related to pulsation generated in the gas. Feeding device. 2. The gas supply device according to claim 1, wherein the gas supply device is applied to a hydrogen recycle desulfurizer of a fuel cell system for recycling fuel gas to the blower means .

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