JP6042270B2 - Combustion device - Google Patents

Description

  The present invention relates to a combustion apparatus, and in particular, a plurality of pilot gas burners using a gas fuel such as natural gas are arranged concentrically, and a plurality of main gas burners are arranged concentrically on the outer peripheral side of the pilot gas burner. The present invention relates to a combustion apparatus arranged in the above.

  As a combustion apparatus that uses a gas fuel such as natural gas, the applicant of the present application previously disposed a burner 1 that is supplied with liquid fuel to the shaft center as shown in FIG. A plurality of pilot gas burners 2 are arranged on a concentric circle through the first swirler 41, and a plurality of main gas burners 3 are arranged on the outer circumference side of the pilot gas burner 2 in a concentric circle. And a combustion apparatus in which the second swirler 42 is disposed on the outer peripheral side of the main gas burner 3, and this combustion apparatus has already been put into practical use (see Patent Document 1).

  By the way, this combustion apparatus includes a plurality of pilot gas burners 2 that are disposed concentrically through the first swirler 41 in a negative pressure region formed by the first swirler 41 disposed at the tip shaft center portion. A stable flame can be formed by supplying an appropriate amount of gas from the above, and by arranging it in the burner 1 to which liquid fuel is supplied to the shaft center, gas fuel dedicated combustion, liquid fuel dedicated combustion, gas fuel Combined with the fact that liquid fuel co-firing is possible, and a plurality of main gas burners 3 are arranged concentrically on the outer peripheral side of the pilot gas burner 2 and the second swirler 42 is arranged on the outer peripheral side thereof. This has the advantage of enabling stable and compact flame formation.

JP 2006-29763 A

By the way, the above-described combustion apparatus places the pilot gas burner 2 and the main gas burner 3 in a common gas chamber 6 so that the ratio of the combustion amount to the pilot gas burner 2 and the main gas burner 3 is always constant regardless of the size of the burner load. Although it is configured to be connected, the structure and control can be simplified, but in order to achieve a high TDR (ratio of the maximum combustion amount and minimum combustion amount of the combustion device), the maximum combustion amount of the combustion device and It is necessary to increase the ratio of the supply gas pressure at the minimum combustion amount (for example, in order to set the ratio of the maximum combustion amount and the minimum combustion amount of the combustion device to 7: 1, the minimum combustion amount at the maximum combustion amount of the combustion device and the minimum The ratio of supply gas pressure at the time of combustion must be 49: 1.) For this reason, a dedicated compressor may be used to increase the gas pressure in the gas storage tank to the required supply gas pressure. .
However, even in this case, there is a problem that the combustion stability of the combustion device at the minimum combustion amount side is lowered because the supply gas pressure at the minimum combustion amount must be reduced.

  In view of the above-described problems of the conventional combustion device, the present invention can achieve a high TDR without increasing the ratio of the supply gas pressure at the maximum combustion amount and the minimum combustion amount of the combustion device. An object is to provide a combustion apparatus.

In order to achieve the above object, a combustion apparatus of the present invention has a swirler disposed at a tip axial center, a plurality of pilot gas burners are disposed concentrically through the swirler, and the pilot gas burner In a combustion apparatus in which a plurality of main gas burners are arranged concentrically on the outer peripheral side, gas fuel is supplied independently to the pilot gas burner and the main gas burner , and the first combustion burner is used. The air supply pipe is disposed so as to surround the plurality of pilot gas burners, and the second combustion air supply pipe is disposed on the outer periphery so as to surround the plurality of main gas burners, and the required combustion amount of the combustion apparatus Is less than the maximum combustion amount of the pilot gas burner, air is supplied to the first combustion air supply pipe, and the required combustion amount is the maximum combustion amount of the pilot gas burner. When more than is characterized in that so as to supply air to the first and second combustion air supply pipe.

In this case, the required combustion amount of the combustion device is below the maximum combustion amount of the pilot gas burner.
The pilot gas burner so that the supply gas pressure to the pilot gas burner and the main gas burner at the maximum combustion amount of the combustion apparatus is the same pressure, and the ratio of the combustion amount to the pilot gas burner and the main gas burner is 1: 4 to 2: 3 And a main gas burner can be set.

When the required combustion amount of the combustion device is less than or equal to the maximum combustion amount of the pilot gas burner, the total gas amount corresponding to the required combustion amount of the combustion device is supplied to the pilot gas burner, and the required combustion amount is When the maximum combustion amount is exceeded, the gas amount corresponding to the required combustion amount of the combustion device can be supplied to the main gas burner with the combustion amount of the pilot gas burner set to the maximum combustion amount.

  Further, the supply gas pressure to the pilot gas burner and the main gas burner can be the same as or lower than the gas pressure in the gas storage tank.

  In addition, a burner to which liquid fuel or gas fuel different from the gas fuel supplied to the pilot gas burner and the main gas burner can be disposed at the axial center of the combustion apparatus.

According to the combustion apparatus of the present invention, gas fuel is supplied independently to the pilot gas burner and the main gas burner , and the first combustion air supply pipe is surrounded by the plurality of pilot gas burners. When the required combustion amount of the combustion device is less than or equal to the maximum combustion amount of the pilot gas burner, the second combustion air supply pipe is disposed on the outer periphery so as to surround the plurality of main gas burners. Air is supplied to the first combustion air supply pipe, and when the required combustion amount exceeds the maximum combustion amount of the pilot gas burner, air is supplied to the first and second combustion air supply pipes. Therefore, it is possible to supply the pilot gas burner and the main gas burner with the amount of combustion air corresponding to the amount of combustion air required by each, It is possible to improve the combustion stability of the device, it is possible to reduce the energy cost.

Further, the supply gas pressure to the pilot gas burner and the main gas burner at the maximum combustion amount of the combustion apparatus is the same pressure, and the ratio of the combustion amount to the pilot gas burner and the main gas burner is 1: 4 to 2: 3. By setting the pilot gas burner and main gas burner, it is possible to achieve a high TDR without increasing the ratio of the supply gas pressure at the maximum combustion amount and the minimum combustion amount of the combustion device. The combustion stability of the combustion device on the side can be maintained.

  When the required combustion amount of the combustion device is less than or equal to the maximum combustion amount of the pilot gas burner, the total gas amount corresponding to the required combustion amount of the combustion device is supplied to the pilot gas burner, and the required combustion amount is When the maximum combustion amount is exceeded, the gas amount corresponding to the required combustion amount of the combustion device is supplied to the main gas burner with the combustion amount of the pilot gas burner set to the maximum combustion amount. Control can be simplified.

  Further, since the TDR can be increased without increasing the ratio of the supply gas pressure at the maximum combustion amount and the minimum combustion amount of the combustion apparatus, the supply gas pressure to the pilot gas burner and the main gas burner is The pressure can be the same as or lower than the gas pressure, which eliminates the need for a dedicated compressor (or operation of a dedicated compressor) to increase the gas pressure in the gas storage tank to the required supply gas pressure. Costs and energy costs can be reduced.

  Further, by arranging a burner supplied with liquid fuel or gas fuel different from the gas fuel supplied to the pilot gas burner and the main gas burner at the shaft center of the combustion apparatus, the gas fuel combustion, liquid fuel combustion, gas Fuel / liquid fuel co-firing can be enabled.

It is explanatory drawing which shows one Example of the combustion apparatus of this invention. It is a graph which shows the relationship between the burner load and combustion amount. It is a graph which shows the relationship between the supply gas pressure with respect to the same burner load, a pilot gas burner, and a main gas burner. It is a graph which shows the relationship between the burner load and supply gas pressure in the conventional combustion apparatus. It is explanatory drawing which shows the conventional combustion apparatus.

  Hereinafter, an embodiment of a combustion apparatus of the present invention will be described based on the drawings.

FIG. 1 shows an embodiment of the combustion apparatus of the present invention.
Like the conventional combustion apparatus, this combustion apparatus is provided with a burner 1 at the shaft center and a swirler 4 at the tip shaft center part, and a plurality of pilot gas burners 2 are concentrically passed through the swirler 4. Further, a plurality of main gas burners 3 are arranged concentrically on the outer peripheral side of the pilot gas burner 2.

Here, the burner 1 disposed at the shaft center is supplied with a liquid fuel or a gas fuel different from the gas fuel supplied to the pilot gas burner 2 and the main gas burner 3. Fuel-only firing, gas fuel / liquid fuel co-firing can be made possible.
Note that the burner 1 can be omitted.

  Three to ten pilot gas burners 2 (in this embodiment, five) are arranged on a concentric circle at equal angular intervals.

Three to ten main gas burners 3 (5 in the present embodiment) are arranged on concentric circles at equiangular intervals and angularly between the pilot gas burners 2. ing.
Note that a second swirler (not shown) may be disposed on the outer peripheral side of the main gas burner 3 as in the conventional combustion apparatus.

  The combustion apparatus supplies the fuel gas independently to the pilot gas burner 2 and the main gas burner 3 via the first gas chamber 61 and the second gas chamber 62, respectively. As shown in the graph showing the relationship between the burner load and the combustion amount and the graph showing the relationship between the burner load and the supply gas pressure to the pilot gas burner and the main gas burner shown in FIG. The supply gas pressure to the pilot gas burner 2 and the main gas burner 3 at the same time and the ratio of the combustion amount to the pilot gas burner 2 and the main gas burner 3 is 1: 4 to 2: 3 (in this embodiment, 3 : 7) The pilot gas burner 2 and the main gas burner 3 are set so that

In this case, when the required combustion amount of the combustion device is less than or equal to the maximum combustion amount of the pilot gas burner 2, the total gas amount corresponding to the required combustion amount of the combustion device is supplied to the pilot gas burner 2, and the required combustion amount is When the maximum combustion amount of the pilot gas burner 2 is exceeded, the gas amount corresponding to the required combustion amount of the combustion device is supplied to the main gas burner 3 with the combustion amount of the pilot gas burner 2 set to the maximum combustion amount. .
Thereby, the control of the burner load can be simplified.

  According to this combustion apparatus, as shown in Table 1, the ratio of the supply gas pressure at the maximum combustion amount and the minimum combustion amount of the combustion apparatus is set as in this combustion apparatus (example) and the conventional combustion apparatus (comparative example). The TDR can be increased without increasing the size, and the combustion stability of the combustion device at the minimum combustion amount side can be maintained.

Since a high TDR can be achieved without increasing the ratio of the supply gas pressure at the maximum combustion amount and the minimum combustion amount of the combustion device, the supply gas pressure to the pilot gas burner 2 and the main gas burner 3 The pressure can be the same as or lower than the gas pressure in the tank (not shown) (8.0 kPa in this embodiment).
Thereby, the graph showing the relationship between the burner load and the supply gas pressure to the pilot gas burner and the main gas burner shown in FIG. 3, and the burner load and the supply gas pressure in the conventional combustion apparatus (comparative example) shown in FIG. As is clear from comparison with the graph showing the relationship, a dedicated compressor (or operation of the dedicated compressor) for increasing the gas pressure in the gas storage tank to the required supply gas pressure is not required, reducing the equipment cost and energy cost. Can be reduced.

In addition, a first combustion air supply pipe 71 that supplies combustion air to the combustion device is disposed so as to surround the plurality of pilot gas burners 2, and a second combustion air supply pipe 72 is provided on the outer periphery thereof. When the required combustion amount of the combustion device is equal to or less than the maximum combustion amount of the pilot gas burner 2, air is supplied to the first combustion air supply pipe 71. When the required combustion amount exceeds the maximum combustion amount of the pilot gas burner, air can be supplied to the first and second combustion air supply pipes 71 and 72.
Thereby, it is possible to supply the combustion gas in an amount corresponding to the amount of combustion air required for the pilot gas burner 2 and the main gas burner 3, respectively, and to improve the combustion stability of the combustion device. , Energy costs can be reduced.

  As mentioned above, although the combustion apparatus of this invention was demonstrated based on the Example, this invention is not limited to the structure described in the said Example, The structure is suitably changed in the range which does not deviate from the meaning. It is something that can be done.

  The combustion apparatus of the present invention has a characteristic that a high TDR can be achieved without increasing the ratio of the supply gas pressure between the maximum combustion amount and the minimum combustion amount of the combustion apparatus. The present invention can be widely used for a combustion apparatus using a gas fuel such as a gas fuel / liquid fuel mixed combustion apparatus or a gas fuel combustion apparatus.

1 Burner 2 Pilot Gas Burner 3 Main Gas Burner 4 Swirler 61 First Gas Chamber 62 Second Gas Chamber 71 First Combustion Air Supply Pipe 72 Second Combustion Air Supply Pipe

Claims (5)

A swirler is disposed at the tip shaft center, a plurality of pilot gas burners are disposed concentrically through the swirler, and a plurality of main gas burners are disposed concentrically on the outer peripheral side of the pilot gas burner. In the combustion device configured to supply gas fuel independently to the pilot gas burner and the main gas burner , and the first combustion air supply pipe surrounds the plurality of pilot gas burners. When the required combustion amount of the combustion device is less than or equal to the maximum combustion amount of the pilot gas burner, the second combustion air supply pipe is disposed on the outer periphery so as to surround the plurality of main gas burners. When the required combustion amount exceeds the maximum combustion amount of the pilot gas burner, the first and second combustion air supplies are supplied. Combustion apparatus being characterized in that so as to supply air to the tube. The pilot gas burner so that the supply gas pressure to the pilot gas burner and the main gas burner at the maximum combustion amount of the combustion apparatus is the same pressure, and the ratio of the combustion amount to the pilot gas burner and the main gas burner is 1: 4 to 2: 3 2. A combustion apparatus according to claim 1, wherein a main gas burner is set. When the required combustion amount of the combustion device is less than or equal to the maximum combustion amount of the pilot gas burner, supply the pilot gas burner with the total gas amount that matches the required combustion amount of the combustion device, and the required combustion amount is the maximum combustion amount of the pilot gas burner. 2. A gas amount corresponding to a required combustion amount of a combustion device is supplied to a main gas burner in a state where the combustion amount of the pilot gas burner is set to a maximum combustion amount when exceeding the amount. Or the combustion apparatus of 2 . The feed gas pressure to the pilot gas burner and the main gas burner, or the gas pressure and the pressure of the gas storage tank, a combustion apparatus according to claim 1, 2 or 3, wherein the more it is low.   5. A burner to which liquid fuel or gas fuel different from the gas fuel supplied to the pilot gas burner and the main gas burner is disposed at the shaft center of the combustion apparatus. The combustion apparatus as described.

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