JP5732754B2 - Combustion control method and combustion apparatus - Google Patents

Description

  The present invention relates to a combustion control method and a combustion apparatus capable of switching a combustion position to four stages of high combustion, medium combustion, low combustion, and combustion stop by controlling the amount of combustion.

  For example, in a boiler as one form of a combustion apparatus, the combustion amount is controlled based on the steam pressure, and when the steam pressure decreases, the combustion amount increases, and when the steam pressure increases, the steam pressure is set by reducing the combustion amount. The pressure is controlled to keep

  By the way, the control of the combustion amount in the boiler is performed by adjusting the fuel amount and the combustion air amount. As the control method, three-position control that can be switched to three stages of high combustion, low combustion, and combustion stop. And 4-position control which can be switched to the stage of high combustion, middle combustion, low combustion, and combustion stop is known (for example, refer to Patent Documents 1 and 2).

  The 4-position control is superior to the 3-position control in that the frequency of stopping combustion can be kept low when the required steam amount is small, but the load pattern at the medium combustion position in this 4-position control is fixed. When the load at the high combustion position is 100%, the load at the middle combustion position is fixed at 65%, for example.

JP 2001-272029 A JP 2007-278539 A

  In the four-position control of the combustion amount in a combustion apparatus such as a boiler, if the load pattern at the middle combustion position is fixed to one type as in the past, the user's diverse needs cannot be met, and combustion at the middle combustion position In fact, there was no way to change the load other than replacing the fuel injection nozzle.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a combustion control method and a combustion apparatus capable of easily changing the combustion load at the middle combustion position in the four-position control. is there.

In order to achieve the above object, the invention according to claim 1 is a combustion capable of switching the combustion position to a plurality of stages of high combustion, medium combustion with a plurality of load patterns , low combustion, and combustion stop by controlling the combustion amount. In the control method, a predetermined combustion position is selected by opening / closing control of an on-off valve provided in each fuel supply line to a plurality of fuel injection nozzles having different fuel injection amounts, and supplied to the predetermined fuel supply line. A flow rate adjusting valve for adjusting the flow rate of the fuel is provided, and when the combustion position shifts from the low combustion to the middle combustion, the flow rate adjusting valve is controlled so that the fuel injection nozzle used at the middle combustion combustion position is controlled. The fuel supply amount is gradually increased, and when the combustion position shifts from the middle combustion to the high combustion, the flow control valve is controlled to control the fuel injection used at the high combustion combustion position. Of the nozzles, characterized in that so as to gradually increase the amount of fuel supplied to the fuel injection nozzles which are not used in the combustion location in said combustion.

According to a second aspect of the present invention, there is provided a combustion apparatus capable of switching the combustion position to a plurality of stages by the combustion control method according to the first aspect , wherein the first fuel supply nozzle ( 10 ) supplies fuel to the first fuel injection nozzle ( 10 ) . the fuel supply line (15), a first first automatic opening and closing valve disposed in the fuel supply line (15) and (V2), the second supplying fuel to the second fuel injection nozzle (11) a fuel supply line (16), and the second automatic closing valve disposed in the second fuel supply line (16) (V4), third fuel to supply fuel to the third fuel injection nozzle (12) The supply line ( 17 ) , the third automatic opening / closing valve ( V6 ) arranged in the third fuel supply line ( 17 ) , and the upstream side and the downstream side of the second automatic opening / closing valve (V 4) are connected. a first bypass line (32), the first bypass line Flow control valve arranged in 32) (MV) and the fourth auto-off valve and (V3), the flow regulating valve in the first bypass line (32) (MV) and the fourth auto-off valve (V3) A second bypass line ( 33 ) that connects a portion between the second fuel supply line ( 17 ) and a downstream side of the third automatic opening / closing valve ( V6 ) , and a second bypass line ( 33 ) . And a fifth automatic on-off valve ( V5 ) .

  According to the present invention, a plurality of load patterns at the middle combustion position are set, and any one of the plurality of load patterns is selected by switching control of the fuel injection nozzles having different fuel injection amounts. The combustion load at the middle combustion position can be easily changed by opening / closing control of the automatic opening / closing valve by the control means without replacing the injection device, thereby meeting various user requirements.

It is a longitudinal cross-sectional view of the boiler which concerns on Embodiment 1 of this invention. It is a block diagram of the fuel control system of the boiler which concerns on Embodiment 1 of this invention. It is a block diagram of the fuel control system of the boiler which concerns on Embodiment 2 of this invention.

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

<Embodiment 1>
FIG. 1 is a longitudinal sectional view of a small once-through boiler as an embodiment of a combustion apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a configuration diagram of a fuel control system of the boiler.

  A boiler 1 shown in FIG. 1 is an oil-fired boiler that burns liquid fuel, and includes a cylindrical can body 4 as an apparatus main body including a burner 2 and a heat transfer tube group (water tube group) 3 as a heat absorbing means. Yes. The can body 4 is installed in a vertically placed state so that its axis is in the vertical direction, and is provided with an upper header 5 and a lower header 6 on the upper and lower sides, respectively.

  A plurality of inner water tubes 7 and outer water tubes 8 constituting the heat transfer tube group 3 are arranged between the upper header 5 and the lower header 6 in a vertically standing state. The upper and lower ends of the outer water pipe 8 communicate with the upper header 5 and the lower header 6, respectively. Here, the plurality of inner water pipes 7 and outer water pipes 8 are arranged at equal intervals in the circumferential direction along the peripheral wall of the can body 4 to form an inner and outer double cylinder. A combustion chamber S is formed in the center.

  Further, the burner 2 is provided in the upper center of the can 4 so as to face downward, and the burner 2 is surrounded by a wind box 9. Here, the burner 2 includes three fuel injection nozzles 10, 11, and 12 (see FIG. 2) having different fuel injection amounts, and a cylindrical combustion cylinder 13 that covers these fuel injection nozzles 10 to 12 from the outside. ing. Note that the three fuel injection nozzles 10 to 12 shown in FIG. 2 are arranged along the direction perpendicular to the plane of FIG.

  By the way, the boiler 1 according to the present embodiment employs a four-position control system capable of switching the combustion position into four stages of high combustion, medium combustion, low combustion, and combustion stop by controlling the combustion amount as will be described later. The configuration of the fuel control system will be described below with reference to FIG.

  As shown in FIG. 2, three fuel supply lines 15, 16, and 17 branch from a fuel supply line 14 connected to a fuel supply facility (not shown), and each fuel supply line 15 to 17 has a fuel injection amount. Each of the different fuel injection nozzles 10 to 12 is connected. The fuel supply lines 14 to 17 are provided with solenoid valves V1, V2, V3, and V4, which are automatic opening / closing valves, and these solenoid valves V1 to V4 are electrically connected to the control means 18, respectively. ing. In the present embodiment, the fuel injection nozzles 10, 11, and 12 have fuel injection amounts of 15G (Gallon / h, hereinafter the same), 30G, and 45G, respectively.

  On the other hand, as shown in FIG. 1, a combustion air passage 20 extending horizontally from the discharge port 19 a of the blower 19 is connected to a side portion of the wind box 9, and an air amount adjustment is performed in the combustion air passage 20. A damper 21 is provided.

  A water supply line 22 extending from a water supply facility (not shown) is connected to the lower header 6, and a water supply pump 23 and a check valve 24 are provided in the water supply line 22. During operation of the boiler 1, the water supply pump 23 is driven to supply water to the lower header 6 through a water supply line 22 from a water supply facility (not shown), and the water supplied to the lower header 6 is supplied to the inner water pipe as will be described later. 7 and the outer water pipe 8 are heated in the process of flowing upward toward the upper header 5 and become steam.

  A steam introduction line 25 is led out from the upper header 5, and this steam introduction line 25 is connected to a gas-liquid separator 26. A steam discharge line 27 and a separated water discharge line 28 extend from the gas-liquid separator 26, and the steam discharge line 27 is connected to a steam use facility (not shown). Is provided. A separated water discharge line 28 extending from the gas-liquid separator 26 is connected to the lower header 6.

  Further, an exhaust gas outlet 30 is opened in the lower side wall of the can body 4, and an exhaust gas passage 31 is connected to the exhaust gas outlet 30. The exhaust gas passage 31 extends horizontally from the exhaust gas outlet 30 and is bent upward at a right angle, and its upper end opening opens into the atmosphere.

  Next, operation | movement of the boiler 1 comprised as mentioned above is demonstrated.

  The boiler 1 according to the present embodiment employs four-position control capable of switching the combustion position to four stages of high combustion, medium combustion, low combustion, and combustion stop as a combustion control system. Then, two load patterns at the middle combustion position are set, 40% load (medium combustion 1) and 60% load (medium combustion 2), and either load is controlled by switching control of the three fuel injection nozzles 10-12. The pattern can be selected. Here, the switching control of the three fuel injection nozzles 10 to 12 is performed by opening and closing the electromagnetic valves V1 to V4 by the control means 18.

  Hereinafter, a four-position control method of combustion in the boiler 1 according to the present embodiment will be described based on Table 1. In Table 1, “◯” indicates that each of the solenoid valves V1 to V4 is open, “L”, “M”, and “H” indicate small, medium, and large capacity fuel injection nozzles 10, 11, 12, and the number “15”. “,” “30”,... Respectively indicate fuel injection amounts G (Gallon / h).

着火時には、表１に示すように制御手段１８によって電磁弁Ｖ１とＶ２が開かれ、燃料は燃料供給ライン１４，１５を経てバーナ２の燃料噴射ノズル（Ｌ）１０へと供給され、１５Ｇの燃料が燃料噴射ノズル１０から缶体４内の燃焼室Ｓに向けて噴射されるとともに、送風機１９から燃焼用空気がバーナ２へと供給される。即ち、送風機１９が駆動されると、該送風機１９の吸入口１９ｂから吸い込まれた外気は、昇圧された後に吐出口１９ａから吐出され、燃焼用空気として燃焼用空気路２０を通ってウィンドボックス９へと導入され、燃焼筒１３を通過して缶体４内の燃焼室Ｓへと供給される。

At the time of ignition, as shown in Table 1, the control means 18 opens the solenoid valves V1 and V2, and the fuel is supplied to the fuel injection nozzle (L) 10 of the burner 2 through the fuel supply lines 14 and 15, and 15G of fuel is supplied. Is injected from the fuel injection nozzle 10 toward the combustion chamber S in the can body 4, and combustion air is supplied from the blower 19 to the burner 2. That is, when the blower 19 is driven, the outside air sucked from the suction port 19b of the blower 19 is pressurized and discharged from the discharge port 19a, and passes through the combustion air passage 20 as combustion air. To the combustion chamber S in the can 4 through the combustion cylinder 13.

  As described above, the fuel injected into the combustion chamber S in the can 4 is ignited by an ignition device (not shown) provided in the burner 2 and burns in the combustion chamber S. The combustion load at this time is set to 20% (15/75 = 0.2), assuming that the load at the high combustion position where 75G fuel burns is 100% as will be described later.

  Thus, at the low combustion position, the state where the solenoid valves V1 and V2 are opened is maintained in the same manner as at the time of ignition (see Table 1), and 15G of fuel is transferred from the fuel injection nozzle 10 to the combustion chamber S in the can 4. It is injected towards and burned. In this way, fuel burns in the combustion chamber S in the can body 4 to generate high-temperature combustion gas, and this combustion gas flows downward through the combustion chamber S toward the exhaust gas outlet 30, and the inner water pipe 7 and the outer The contact is repeated so as to intersect with the water pipe 8, and the water flowing upward through the inner water pipe 7 and the outer water pipe 8 is heated to form steam. Then, the steam is introduced from the upper header 5 into the gas-liquid separator 26 through the steam introduction line 25, and the gas-liquid is separated in the gas-liquid separator 26. To the steam use facility (not shown) through the main steam valve 29. Further, the water separated from the steam is returned to the lower header 6 through the separated water discharge line 28 and again used for heating.

  As described above, the combustion gas used for generating steam flows as exhaust gas from the exhaust gas outlet 30 to the exhaust gas passage 31 and is discharged into the atmosphere through the exhaust gas passage 31.

  Next, at the middle combustion position, as described above, the load pattern is selected as one of two load patterns, that is, 40% load (medium combustion 1) and 60% load (medium combustion 2).

  That is, when 40% load (medium combustion 1) is selected, as shown in Table 1, the electromagnetic valve V2 is closed and the electromagnetic valve V3 is opened by the control means 18, and the fuel is supplied to the fuel supply line 14, 16 is supplied to the fuel injection nozzle (M) 11 of the burner 2, and 30 G of fuel is injected from the fuel injection nozzle 11 toward the combustion chamber S in the can body 4 for combustion. The combustion load in this case is set to 40% (30/75 = 0.4), assuming that the load at the high combustion position where 75 G fuel burns is 100%.

  On the other hand, when 60% load (medium combustion 2) is selected, as shown in Table 1, the electromagnetic valve V2 is closed and the electromagnetic valve V4 is opened by the control means 18, and the fuel is supplied to the fuel supply line 14, Through 17, the fuel is supplied to the fuel injection nozzle (H) 12 of the burner 2, and 45 G of fuel is injected from the fuel injection nozzle 12 toward the combustion chamber S in the can body 4 for combustion. The combustion load in this case is set to 60% (45/75 = 0.6), assuming that the load at the high combustion position where 75G fuel burns is 100%.

  As described above, in the present embodiment, two load patterns at the middle combustion position, that is, 40% load (medium combustion 1) and 60% load (medium combustion 2) are set, and the three fuel injection nozzles 10 to 10 are set. Since either one of the load patterns is selected by the switching control of 12, the control means 18 does not replace the fuel injection nozzle as in the prior art, but the opening and closing control of the electromagnetic valves V1 to V4 by the control means 18 is performed at the middle combustion position. It is possible to easily change the combustion load and meet various user requirements.

  In the high combustion position, as shown in Table 1, the control means 18 opens the solenoid valves V1, V3 and V4, and the fuel passes from the fuel supply line 14 through the fuel supply line 16 to the fuel injection nozzle ( M) is supplied to 11 and supplied to the fuel injection nozzle (H) 12 through the fuel supply line 17, 30 G of fuel is supplied from the fuel injection nozzle 11, and 45 G of fuel is supplied from the fuel injection nozzle 12. A total of 75 G of fuel is injected toward the combustion chamber S in the can 4 and used for combustion. In this case, the combustion load is set to 100% (75/75 = 1).

  When the amount of steam obtained in each of the low combustion / medium combustion 1, 2 and high combustion positions exceeds the required steam amount, the control means 18 closes the electromagnetic valve V1 and returns to the burner 2 for the fuel amount. Is cut off and combustion is stopped.

  As described above, in the boiler 1 according to the present embodiment, the four-position control in which the combustion position is switched to four stages of high combustion, middle combustion, low combustion, and combustion stop by controlling the combustion amount is performed. Then, one of two load patterns (40% load and 60% load) can be selected according to the user's needs.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a configuration diagram of the combustion control system according to the present embodiment.

  Since the configuration excluding the combustion control system of the boiler according to the present embodiment is the same as the configuration of the boiler according to the first embodiment shown in FIG. 1, the illustration and description thereof are omitted.

  The boiler according to the present embodiment also adopts a four-position control system capable of switching the combustion position to four stages of high combustion, medium combustion, low combustion, and combustion stop by controlling the combustion amount. The configuration of the control system is different from that of the first embodiment.

  That is, as shown in FIG. 3, three fuel supply lines 15, 16, and 17 are branched from a fuel supply line 14 connected to a fuel supply facility (not shown). The fuel injection nozzles 10, 11, and 12 having different amounts are connected to the fuel injection nozzles 10, 11, and 12, respectively. The fuel supply lines 14 to 17 are provided with solenoid valves V1, V2, V4, and V6, which are automatic opening / closing valves, respectively.

  The fuel supply line 16 is connected to a bypass line 32 that bypasses the electromagnetic valve V4. The bypass line 32 is provided with an electric flow rate adjusting valve MV and an electromagnetic valve V3. A bypass line 33 branches from between the flow rate adjusting valve MV and the electromagnetic valve V3 of the bypass line 32, and this bypass line 33 is connected to the downstream side of the electromagnetic valve V6 of the fuel supply line 17 and is in the middle thereof. Is provided with a solenoid valve V5.

  The electromagnetic valves V1 to V6 are electrically connected to the control means 18 that controls the opening and closing of these. In the present embodiment, as in the first embodiment, the fuel injection nozzles 10, 11, and 12 have fuel injection amounts of 15G, 30G, and 45G, respectively.

  Thus, as in the first embodiment, the boiler according to the present embodiment adopting the four-position control method as the combustion control has a load pattern at the middle combustion position of 40% load as in the first embodiment. And 60% load are set, and one of the load patterns can be selected by switching control of the three fuel injection nozzles 10-12. Here, switching control of the three fuel injection nozzles 10 to 12 is performed by opening and closing the electromagnetic valves V1 to V6 by the control means 18.

  Hereinafter, a four-position control method of combustion in the boiler according to the present embodiment will be described based on Tables 2 and 3. Table 2 shows the control state when the 40% load pattern is selected at the medium combustion position, and Table 3 shows the control state when the 60% load pattern is selected. The display in these tables is shown in Table 1. Is the same as that.

本実施の形態に係るボイラの着火と低燃焼における燃焼制御は前記実施の形態１のそれと同じであるため、これについての再度の説明は省略する。

Since the combustion control in the ignition and low combustion of the boiler according to the present embodiment is the same as that in the first embodiment, the re-explanation thereof will be omitted.

  Thus, also in this embodiment, one of the two load patterns (40% load and 60% load) can be selected at the middle combustion position as in the first embodiment.

  First, when the 40% load is selected, the fuel injection amount is gradually increased using the flow rate adjustment valve MV without immediately switching from the low combustion to the middle combustion. That is, in this process, as shown in Table 2, the solenoid valves V1 to V3 are opened by the control means 18, and the fuel is supplied to the fuel injection nozzle (L) 10 through the fuel supply lines 14 and 15, Fuel is injected from the fuel injection nozzle 10 toward the combustion chamber S in the can 4 and used for combustion. At the same time, the flow rate adjusting valve MV is gradually opened from the fully closed state by electricity, and the fuel is supplied from the bypass line 32 to the fuel injection nozzle (M) 11 through the fuel supply line 16. The fuel injection amount gradually increases, and finally, the fuel injection nozzle 11 injects the fuel of 15G, which is ½ of the rating, and the fuel injection amount of 15G from the fuel injection nozzle 10 is combined to inject a total of 30G of fuel. To be used for combustion. The reason why the fuel injection amount is gradually increased by using the flow rate adjusting valve MV without immediately switching from the low combustion to the medium combustion is to stabilize the combustion transition. The combustion load in this case is set to 40% (30/75 = 0.4), assuming that the load at the high combustion position where 75 G fuel burns is 100%.

  When a total of 30 G of fuel is finally injected from both the fuel injection nozzles 10 and 11, as shown in Table 2, the electromagnetic valves V2 and V3 are closed by the control means 18 and the flow rate adjustment valve MV. Is fully closed and the solenoid valve V4 is opened. Then, the fuel is supplied from the fuel supply line 16 to the fuel injection nozzle (M) 11, and 30 G of fuel is injected from the fuel injection nozzle 11 to be used for combustion. The combustion load in this case is set to 40% (30/75 = 0.4), assuming that the load at the high combustion position where 75 G fuel burns is 100%.

  Next, when switching from medium combustion to high combustion is performed, the fuel injection amount is gradually increased using the flow rate adjustment valve MV without immediately switching from medium combustion to high combustion in order to stabilize the combustion transition. The That is, in this process, as shown in Table 2, the electromagnetic valve V5 is opened by the control means 18, 30G of fuel is continuously injected from the fuel injection nozzle (M) 11, and the flow rate adjusting valve MV is all electrically driven. The fuel is gradually opened from the closed state to the fully opened state, and the fuel is supplied from the bypass lines 32 and 33 to the fuel injection nozzle (H) 12 through the fuel supply line 17, and the injection amount from the fuel injection nozzle 12 gradually increases. Finally, rated fuel of 45G is injected from the fuel injection nozzle 12, and a total of 75G of fuel including the fuel injection amount 30G from the fuel injection nozzle 11 is injected and used for combustion. In this case, the combustion load is set to 100% (75/75 = 1).

  When a total of 75 G of fuel is finally injected from both fuel injection nozzles 11 and 12, as shown in Table 2, the electromagnetic valve V5 is closed and the electromagnetic valve V6 is opened by the control means 18. . Then, the fuel is supplied from the fuel supply line 17 to the fuel injection nozzle (H) 12, 45 G of fuel is injected from the fuel injection nozzle 12, and is continuously injected from the fuel injection nozzle (M) 11. A total of 75G of fuel is injected and used for combustion. In this case, the combustion load is set to 100% (75/75 = 1).

  Next, when the 60% load is selected, the fuel injection amount is gradually increased using the flow rate adjustment valve MV in order to stabilize the combustion transition without immediately switching from the low combustion to the middle combustion. That is, in this process, as shown in Table 3, the electromagnetic valve V5 is opened by the control means 18 and the flow rate adjusting valve MV is gradually opened by electric drive, and the fuel passes through the supply lines 17 from the bypass lines 32 and 33. The fuel is supplied to the fuel injection nozzle (H) 12, and the fuel injection amount from the fuel injection nozzle 12 gradually increases. Finally, when 2/3 of the rated 30 G fuel is injected from the fuel injection nozzle 12, a total of 45 G of fuel is injected, including 15 G continuously injected from the fuel injection nozzle 10. It is used for combustion. The combustion load in this case is set to 60% (45/75 = 0.6), assuming that the load at the high combustion position where 75G fuel burns is 100%.

  When a total of 45 G of fuel is finally injected from both the fuel injection nozzles 10 and 12, as shown in Table 3, the electromagnetic valves V2 and V5 are closed by the control means 18 and the flow rate adjustment valve MV. Is fully closed and the solenoid valve V6 is opened. Then, the fuel is supplied from the fuel supply line 17 to the fuel injection nozzle (H) 12, and 45 G of fuel is injected from the fuel injection nozzle 12 to be used for combustion. The combustion load in this case is set to 60% (45/75 = 0.6), assuming that the load at the high combustion position where 75G fuel burns is 100%.

  Next, when switching from medium combustion to high combustion is performed, the fuel injection amount is gradually increased using the flow rate adjustment valve MV without immediately switching from medium combustion to high combustion in order to stabilize the combustion transition. The That is, in this process, as shown in Table 3, the electromagnetic valve V3 is opened by the control means 18, 45G fuel is continuously injected from the fuel injection nozzle (H) 12, and the flow rate adjusting valve MV is all electrically driven. The fuel is gradually opened from the closed state to the fully opened state, and the fuel is supplied from the bypass line 32 to the fuel injection nozzle (M11) through the fuel supply line 16, and the amount of injection from the fuel injection nozzle 11 gradually increases. The fuel injection nozzle 11 injects a rated 30 G fuel, and a total of 75 G of fuel including the injection amount 45 G from the fuel injection nozzle (H) 12 is injected for combustion. In this case, the combustion load is set to 100% (75/75 = 1).

  When a total of 75 G of fuel is finally injected from both the fuel injection nozzles 11 and 12, as shown in Table 3, the electromagnetic valve V3 is closed by the control means 18 and the electromagnetic valve V4 is opened. . Then, the fuel is supplied from the fuel supply line 16 to the fuel injection nozzle (M) 11, 30 G of fuel is injected from the fuel injection nozzle 11, and is continuously injected from the fuel injection nozzle (H) 12. A total of 75 G of fuel combined with the above fuel is injected for combustion. In this case, the combustion load is set to 100% (75/75 = 1).

As described above, in the boiler according to the present embodiment, four-position control is performed in which the combustion position is switched to four stages of high combustion, middle combustion, low combustion, and combustion stop by controlling the combustion amount. In the embodiment, the load pattern at the middle combustion position is set to two patterns of 40% load and 60% load, and one of the load patterns is selected by switching control of the three fuel injection nozzles 10 to 12. Therefore, the combustion load at the middle combustion position can be easily changed by opening / closing control of the electromagnetic valves V1 to V6 by the control means 18 without replacing the fuel injection nozzle as in the prior art. In addition, although the above demonstrated the form which applied this invention with respect to the oil-fired small once-through type boiler, this invention is other forms. Of course, the present invention can be similarly applied to other arbitrary combustion apparatuses including a boiler and an absorption refrigerating machine regenerator.

  In the above embodiment, the load pattern at the middle combustion position is two patterns of 40% load and 60% load, but the number of load patterns and load% can be arbitrarily set.

1 Boiler (combustion device)
2 Burner 3 Heat transfer tube group 4 Can body 5 Upper header 6 Lower header 7 Inner water tube 8 Outer water tube 9 Wind box 10-12 Fuel injection nozzle 13 Combustion cylinder 14-17 Fuel supply line 18 Control means 19 Blower 19a Exhaust of blower Outlet 19b Blower inlet 20 Combustion air path 21 Damper 22 Water supply line 23 Water supply pump 24 Check valve 25 Steam introduction line 26 Gas-liquid separator 27 Steam discharge line 28 Separated water discharge line 29 Main steam valve 30 Exhaust port 31 Exhaust gas Paths 32, 33 Bypass line MV Flow control valve S Combustion chamber V1-V7 Solenoid valve (automatic open / close valve)

Claims (2)

In the combustion control method that can switch the combustion position to multiple stages of high combustion, medium combustion with multiple load patterns, low combustion, and combustion stop by controlling the amount of combustion,
A predetermined combustion position is selected by opening / closing control of an open / close valve provided in each fuel supply line to a plurality of fuel injection nozzles having different fuel injection amounts, and the flow rate of fuel supplied to the predetermined fuel supply line is set. Provide a flow adjustment valve to adjust,
At the time of transition of the combustion position from the low combustion to the middle combustion, the flow rate adjustment valve is controlled to gradually increase the amount of fuel supplied to the fuel injection nozzle used at the combustion position of the middle combustion,
Of the fuel injection nozzles used in the high combustion combustion position by controlling the flow rate adjusting valve at the time of transition from the middle combustion to the high combustion, the fuel injection nozzle is not used in the intermediate combustion combustion position. A combustion control method for gradually increasing the amount of fuel supplied to a fuel injection nozzle. A combustion apparatus capable of switching a combustion position to a plurality of stages by the combustion control method according to claim 1,
A first fuel supply line ( 15 ) for supplying fuel to the first fuel injection nozzle ( 10 ) ;
A first automatic on-off valve ( V2 ) disposed in the first fuel supply line ( 15 ) ;
A second fuel supply line ( 16 ) for supplying fuel to the second fuel injection nozzle ( 11 ) ;
A second automatic opening / closing valve ( V4 ) disposed in the second fuel supply line ( 16 ) ;
A third fuel supply line ( 17 ) for supplying fuel to the third fuel injection nozzle ( 12 ) ;
A third automatic on-off valve ( V6 ) disposed in the third fuel supply line ( 17 ) ;
A first bypass line ( 32 ) connecting the upstream side and the downstream side of the second automatic opening / closing valve (V4) ;
A flow rate adjusting valve ( MV ) and a fourth automatic opening / closing valve ( V3 ) disposed in the first bypass line ( 32 ) ;
The portion between the flow rate adjusting valve ( MV ) and the fourth automatic opening / closing valve ( V3 ) in the first bypass line ( 32 ) and the third automatic opening / closing valve ( V6 ) in the third fuel supply line ( 17 ) . A second bypass line ( 33 ) connecting the downstream side;
And a fifth automatic opening / closing valve ( V5 ) disposed in the second bypass line ( 33 ) .

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