JP2016020789A - Boiler system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boiler system capable of effectively suppressing the influence of a variation in a mass flow generated by a temperature variation on an air ratio, and stably and efficiently exerting a combustion control.SOLUTION: A boiler system 1 comprises: a storage unit 72 storing a flow volume of combustion air and a value of a degree of opening of a flow regulating valve 56 while making the flow volume correspond to the value of the degree of opening; a degree-of-opening setting unit 91 setting a value of a degree of opening on the basis of the flow volume of the combustion air detected by an air differential pressure sensor 33; a temperature correction unit 92 correcting the value of the degree of opening on the basis of a temperature detected by a fuel gas temperature sensor 57; and a degree-of-opening control unit 95 controlling the degree of opening of the flow regulating valve 56 on the basis of the corrected value of the degree of opening corrected by the temperature correction unit 92.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a boiler device. More specifically, the present invention relates to a boiler device that controls a flow rate adjustment valve of a fuel supply line so that fuel gas corresponding to the supply amount of combustion air is supplied.

  2. Description of the Related Art Conventionally, there has been known a boiler apparatus that generates steam by burning water-fuel mixture obtained by mixing fuel gas and combustion air at a predetermined ratio to heat water. In this type of boiler device, the flow rate of the fuel gas is adjusted by a flow rate adjustment valve in accordance with the supply amount of combustion air so that the air ratio, which is the ratio between the theoretical air amount and the air amount supplied to the boiler, is constant. It is adjusted. For example, Japanese Patent Application Laid-Open No. H10-228707 discloses such control that keeps the air ratio constant. Patent Document 1 discloses a fuel gas amount control device for a premixed gas burner that adjusts a fuel gas control valve in accordance with fluctuations in the amount of combustion air supplied to make the air ratio constant.

JP-A-11-108352

  By the way, LNG (Liquid Natural Gas) is widely spread as a fuel gas due to the increase in environmental awareness. One method for supplying LNG is so-called LNG satellite supply in which LNG is transported in a liquid state and vaporized at a supply destination that uses LNG. Although LNG satellite supply can reduce the introduction cost and is used in various fields, the fuel gas tends to be more susceptible to the external environment than the method of transporting the fuel gas through the pipeline. .

  When temperature fluctuations occur in the fuel gas due to the influence of the external environment or the like, the mass flow rate fluctuates and the amount of air necessary for combustion also changes. If the amount of air required for combustion (theoretical amount of air) changes, even if the amount of fuel air supplied is constant, the air ratio will fluctuate, which may lead to reduced combustion efficiency and incomplete combustion . In this respect, it is difficult to say that the fluctuation of the mass flow rate of the fuel gas caused by a change in the external environment is sufficiently taken into consideration in the conventional boiler apparatus, and it is improved from the viewpoint of performing more efficient combustion control There was room for.

  An object of this invention is to provide the boiler apparatus which can suppress the influence which the fluctuation | variation of the mass flow rate produced by a temperature fluctuation has on an air ratio, and can perform combustion control stably and efficiently.

  The present invention includes a boiler, a fuel supply line that supplies fuel gas to the boiler, a flow rate adjustment valve that is disposed in the fuel supply line and that can adjust the flow rate of the fuel gas, and the fuel that flows through the fuel supply line A fuel gas temperature detector for detecting a gas temperature; an air supply line for supplying combustion air to be mixed with the fuel gas in the boiler; and an air flow rate for detecting a flow rate of the combustion air flowing through the air supply line Based on the flow rate of the combustion air detected by the detection unit, the storage unit that stores the flow rate of the combustion air and the opening value of the flow rate adjustment valve in association with each other, and the flow rate of the combustion air detected by the air flow rate detection unit. An opening setting unit for setting the degree value, and a temperature for correcting the opening value based on the temperature detected by the fuel gas temperature detection unit so that the mass flow rate of the fuel gas becomes a predetermined value And Tadashibu, the opening control unit which controls the opening of the flow regulating valve based on the correction opening value corrected by the temperature correction unit relates boiler apparatus, characterized in that it comprises a.

  The boiler device is disposed on the downstream side of the flow rate adjustment valve, and detects a pressure of the fuel gas flowing through the fuel supply line, and a pressure detected by the fuel gas pressure detection unit. It is preferable to further include a pressure correction unit that corrects the opening value.

  The boiler device is disposed in the fuel supply line, detects a heat amount of the fuel gas, a heat amount detection unit, a heat amount correction unit that corrects the opening value based on the heat amount detected by the heat amount detection unit, Is preferably further provided.

  ADVANTAGE OF THE INVENTION According to this invention, the boiler apparatus which can suppress effectively the influence which the fluctuation | variation of the mass flow rate produced by a temperature fluctuation has on an air ratio, and can perform combustion control stably and efficiently can be provided.

It is a figure showing typically one embodiment of the boiler device of the present invention. It is a graph which shows the relationship between the mass flow rate of fuel gas, and the oxygen concentration in waste gas. It is a block diagram which shows the structure of the control part of 1st Embodiment. It is a figure which shows typically the boiler apparatus of 2nd Embodiment. It is a block diagram which shows the structure of the control part of 2nd Embodiment.

  Hereinafter, preferred embodiments of the boiler device of the present invention will be described with reference to the drawings. The boiler apparatus 1 of 1st Embodiment is a steam boiler which heats water and produces | generates a vapor | steam, and supplies a vapor | steam to load equipment (illustration omitted). The “line” in the present specification is a general term for lines capable of flowing a fluid such as a flow path, a path, and a pipeline.

  As shown in FIG. 1, a boiler apparatus 1 includes a boiler 2, a fuel supply unit 50 that supplies fuel gas to the boiler 2, a water supply path (not shown) that supplies water to the boiler 2, fuel gas and combustion And a control device 70 for controlling the supply amount of air and the like.

  The boiler 2 includes a can body 10, a blower 20 that sends combustion air to the can body 10, an air supply duct 30 that connects the can body 10 and the blower 20, and serves as an air supply line through which combustion air flows. A damper 31 disposed in the air duct 30, a punching metal 32 as a combustion air decompression member, an air differential pressure sensor 33 as an air flow rate detector, and a combustion gas (exhaust gas) discharged from the can body 10 circulates. And an exhaust pipe 80 as an exhaust gas discharge section.

  The can 10 includes a boiler housing 11, a plurality of water pipes 12, a lower header 13, an upper header 14, and a burner 15.

  The boiler housing | casing 11 comprises the external shape of the can 10, and is formed in the rectangular parallelepiped shape of planar view. An air supply port 16 is formed in the first side surface 11a located on one end side in the longitudinal direction of the boiler casing 11, and a second side surface 11b located on the other end side in the longitudinal direction of the boiler casing 11 is An exhaust port 17 is formed.

  The plurality of water pipes 12 are disposed so as to extend in the vertical direction inside the boiler housing 11 and are disposed at predetermined intervals in the longitudinal direction and the width direction of the boiler housing 11.

  The lower header 13 is disposed at the lower part of the boiler casing 11. The lower header 13 is connected to the lower ends of the plurality of water pipes 12. The upper header 14 is disposed on the upper portion of the boiler casing 11. The upper header 14 is connected to the upper ends of the plurality of water pipes 12.

  The burner 15 is disposed in the air supply port 16. The mixture of fuel gas and combustion air is burned by the burner 15, and the water in the water pipe 12 is heated to generate steam.

  The blower 20 includes a blower body 21 having a fan and a motor that rotates the fan, and an inverter 22 that increases or decreases the number of rotations of the fan (motor). The blower 20 feeds combustion air into the can body 10 when the fan rotates at a predetermined rotation speed in accordance with the frequency input to the inverter 22.

  In the present embodiment, the flow rate of the combustion air is set according to a required load required from a load device (not shown). The blower 20 is controlled by the control device 70 via the inverter 22 so that the flow rate of the fuel air is set.

  The air supply duct 30 is an air supply line that supplies combustion air to be mixed with fuel gas into the boiler 2. The air supply duct 30 has an upstream end connected to the blower 20 and a downstream end connected to the air supply port 16. The air supply duct 30 supplies the combustion air sent from the blower 20 to the can body 10.

  The damper 31 is in a closed state in which the combustion air flow path inside the air supply duct 30 is closed and rotated 90 degrees from this closed state to open the combustion air flow path in the air supply duct 30. It is arranged to be rotatable between states.

  The punching metal 32 is a metal plate in which a plurality of through holes are formed, and is a combustion air pressure-reducing member that depressurizes the combustion air that circulates. The punching metal 32 is disposed on the downstream side of the damper 31 inside the air supply duct 30. The punching metal 32 decompresses the combustion air flowing through the damper 31 to the air supply duct 30.

  The air differential pressure sensor 33 is an air flow rate detection unit for detecting the flow rate of combustion air. The air differential pressure sensor 33 detects a differential pressure between the upstream pressure and the downstream pressure of the punching metal 32. The flow rate of the fuel air is calculated based on this differential pressure information. Further, the air differential pressure sensor 33 is electrically connected to the control device 70, and the control device 70 acquires air differential pressure information detected by the air differential pressure sensor 33.

  The exhaust cylinder 80 is connected to the can body 10 (exhaust port 17 formed in the boiler casing 11) on the base end side, and is formed in a cylindrical shape. Combustion gas (exhaust gas) generated in the can body 10 is discharged to the outside of the can body 10 through the exhaust cylinder 80.

  Next, the fuel supply unit 50 that supplies fuel to the boiler 2 will be described. The fuel supply unit 50 includes a fuel supply line 51, a fuel gas flow meter 52, an on-off valve 54, a governor 55, a flow rate adjustment valve 56, a fuel gas temperature sensor 57, a fuel gas pressure sensor 58, and an orifice 59. And a nozzle 61.

  The fuel supply line 51 has an upstream side connected to a fuel supply source (not shown) and a downstream side connected to the air supply duct 30. The downstream end of the fuel supply line 51 is connected to the downstream side of the supply duct 30 from the position where the damper 31 is disposed. In the present embodiment, the fuel gas flowing through the fuel supply line 51 is LNG. LNG vaporized from the LNG storage facility supplied by the LNG satellite is supplied to the fuel supply line 51.

  The fuel gas flow meter 52 measures the flow rate of the fuel gas flowing through the fuel supply line 51 on the upstream side of the flow rate adjustment valve 56. The fuel gas flow meter 52 of the present embodiment is disposed on the most upstream side of the fuel supply line 51. The fuel gas flow meter 52 is electrically connected to the control device 70. The control device 70 acquires fuel gas flow rate information based on the measured value of the fuel gas flow meter 52.

  The on-off valve 54 opens or closes the fuel supply line 51 to supply and stop the fuel gas. The on-off valve 54 of the present embodiment is disposed on the fuel supply line 51 downstream of the fuel gas flow meter 52.

  The governor 55 is pressure adjusting means for suppressing a rapid pressure fluctuation such as when the pressure of the fuel gas flowing through the fuel supply line 51 increases momentarily. The governor 55 of the present embodiment is disposed on the downstream side of the on-off valve 54 in the fuel supply line 51.

  The flow rate adjustment valve 56 adjusts the flow rate of the fuel gas flowing through the fuel supply line 51. The flow rate adjustment valve 56 is configured to be able to adjust the opening degree. The flow rate adjustment valve 56 of the present embodiment is disposed on the downstream side of the governor 55 in the fuel supply line 51. The flow rate adjustment valve 56 is electrically connected to the control device 70, and the control device 70 can adjust the opening degree of the flow rate adjustment valve 56.

  The fuel gas temperature sensor 57 is a fuel gas temperature detector that measures the temperature of the fuel gas flowing through the fuel supply line 51 on the downstream side of the flow rate adjustment valve 56. The fuel gas temperature sensor 57 of the present embodiment is disposed downstream of the flow rate adjustment valve 56 in the fuel supply line 51. The fuel gas temperature sensor 57 is electrically connected to the control device 70, and the control device 70 acquires temperature information of the fuel gas temperature sensor 57.

  The fuel gas pressure sensor 58 is a fuel gas pressure detector that measures the pressure of the fuel gas flowing through the fuel supply line 51 on the downstream side of the flow rate adjustment valve 56. The fuel gas pressure sensor 58 of the present embodiment is disposed downstream of the fuel gas temperature sensor 57 in the fuel supply line 51. The fuel gas pressure sensor 58 is electrically connected to the control device 70, and the control device 70 acquires pressure information of the fuel gas pressure sensor 58.

  The orifice 59 is a fuel gas decompression member that decompresses the fuel gas flowing through the fuel supply line 51. The orifice 59 of the present embodiment is disposed on the downstream side of the fuel gas pressure sensor 58 in the fuel supply line 51.

  The nozzle 61 is disposed at the downstream end of the fuel supply line 51 and ejects fuel gas to the air supply duct 30. The fuel gas ejected from the nozzle 61 is mixed with the combustion air sent by the blower 20, and the mixed gas is burned by the burner 15.

  As described above, the fuel supply unit 50 can supply the fuel gas to the boiler 2 (can 10) through the fuel supply line 51 at an appropriate flow rate.

  The control device 70 will be described. The control device 70 controls the flow rate adjustment valve 56 and the blower 20 based on signals from each electrically connected sensor. The control device 70 includes a control unit 71 that performs various controls for adjusting the flow rate of combustion air and the flow rate of fuel gas, and a storage unit 72 that stores various types of information.

  The control device 70 of the first embodiment controls the flow rate adjustment valve 56 based on the mass flow rate of the fuel gas in order to keep the air ratio constant. First, the relationship between the change in the mass flow rate of the fuel gas and the combustion rate will be described with reference to FIG. FIG. 2 is a graph showing the relationship between the mass flow rate of the fuel gas and the oxygen concentration in the exhaust gas. In FIG. 2, trial calculation conditions are set, and a change in mass flow rate due to a change in fuel gas temperature and a ratio of oxygen concentration in the exhaust gas indicating the combustion rate are calculated. The fuel gas pressure is assumed to be constant.

As shown in FIG. 2, when a temperature change occurs in the fuel gas, the volume of the fuel gas changes and the mass flow rate changes. When the temperature of the fuel gas increases, the volume of the fuel gas increases, so the mass flow rate of the fuel gas decreases. When the temperature of the fuel gas decreases, the volume decreases, so the mass flow rate of the fuel gas increases. When such a change in mass flow rate occurs, even if the volume flow rate is constant, the theoretical amount of combustion air necessary for combustion of the fuel gas changes, and the air ratio changes. As shown in FIG. 2, the air ratio increases and the O ₂ concentration in the exhaust gas increases as the mass flow rate of the fuel gas decreases, while the air ratio decreases as the mass flow rate of the fuel gas increases. The O ₂ concentration in the exhaust gas becomes low. The air ratio is a value that is set in the boiler device 1 in order to appropriately perform combustion. If the air ratio cannot be controlled to a constant value, heat loss due to excess air occurs and combustion efficiency decreases. There is a risk of energy loss due to incomplete combustion.

  Therefore, the control device 70 of the present embodiment is configured to control the flow rate adjustment valve 56 based on the mass flow rate in order to keep the air ratio set in the boiler device 1 constant. Next, the detailed structure of the control part 71 with which the boiler apparatus 1 of 1st Embodiment is provided is demonstrated. FIG. 3 is a block diagram illustrating a configuration of the control unit 71. As shown in FIG. 3, the control unit 71 of the first embodiment includes an opening setting unit 91, a temperature correction unit 92, and an opening control unit 95.

  The opening setting unit 91 sets an opening value indicating the opening of the flow rate adjustment valve 56. The opening value is a value for determining the mass flow rate of the fuel gas with respect to the flow rate of the combustion air under a predetermined condition. The predetermined conditions here are various conditions set in advance such as the reference temperature of the fuel gas, the reference pressure of the fuel gas, the reference heat quantity based on the composition of the fuel gas, and the air ratio, and the fuel gas is in this predetermined condition. The opening value is set as a thing. The storage unit 72 stores a functional expression or a data table for setting an opening value corresponding to the flow rate of combustion air under a predetermined condition.

  The temperature correction unit 92 corrects the opening value according to the temperature fluctuation of the fuel gas so that the mass flow rate of the fuel gas becomes constant. A temperature difference between the temperature of the fuel gas detected by the fuel gas temperature sensor 57 and a reference temperature set as a predetermined condition is detected as a temperature fluctuation. The temperature correction unit 92 performs correction to suppress the influence of the mass flow rate variation caused by the temperature variation. This correction is performed on the assumption that the pressure of the fuel gas is at a preset reference pressure.

  The storage unit 72 stores a function formula or table data for correcting the opening value based on the value of the mass flow rate under a predetermined condition and the temperature fluctuation detected by the fuel gas temperature sensor 57. . The temperature correction unit 92 reads information necessary for calculation from the storage unit 72 when performing the correction process, corrects the opening value, and calculates a corrected opening value. For example, when the temperature of the fuel gas is higher than the reference temperature without pressure fluctuation, the mass flow rate of the fuel gas is reduced, so that the flow rate (volume flow rate) of the fuel gas is increased. The degree value is corrected (see FIG. 2). Similarly, when the temperature of the fuel gas is lower than the reference temperature, the opening degree value is corrected so that the flow rate of the fuel gas becomes small.

  The opening control unit 95 controls the opening of the flow rate adjustment valve 56 based on the corrected opening value corrected by the temperature correction unit 92. Thereby, the opening degree of the flow rate adjusting valve 56 is determined based on the corrected opening degree value reflecting the temperature variation of the fuel gas. Note that the control of the flow rate adjustment valve 56 based on the corrected opening value may be performed at all times when the boiler device 1 is normally operating, or the temperature and pressure are extracted at predetermined intervals and detected at that timing. Correction processing may be performed on the basis of the temperature and the pressure.

  Next, a series of flow of control of the flow rate adjustment valve 56 in the first embodiment will be described. When the control of the flow rate adjustment valve 56 is started, the opening degree setting unit 91 acquires the flow rate of the combustion air calculated based on the detection signal of the air differential pressure sensor 33. The opening setting unit 91 sets an opening value corresponding to the obtained flow rate of combustion air from the storage unit 72. Next, the opening degree value set by the opening degree setting part 91 is corrected by the temperature correction part 92, and a corrected opening degree value reflecting the temperature variation of the fuel gas is calculated.

  The opening degree control unit 95 controls the opening degree of the flow rate adjusting valve 56 based on the corrected opening degree value. Thereby, the temperature variation of the fuel gas is reflected in the actual opening of the flow rate adjustment valve 56. The fuel gas is sent to the air supply duct 30 via the fuel supply line 51 with the flow rate adjusted appropriately by the opening degree control unit 95. The fuel gas supplied into the air supply duct 30 via the nozzle 61 is mixed with the combustion air sent into the air supply duct 30 by the blower 20. A mixed gas of fuel gas and combustion air is ejected from the burner 15 into the can 10 and burned. In the present embodiment, since the flow rate adjustment valve 56 is controlled so that the air ratio is kept constant in accordance with a change in the external environment (temperature fluctuation), it is easily affected by the external environment such as LNG satellite supply. Even if it is a case, the combustion control of the boiler 2 can be performed stably.

  And the water supplied with the combustion of the mixed gas by the burner 15 heats the water supplied from the lower header 13 to the inside of the plurality of water pipes 12, and generates steam. The steam generated in the plurality of water pipes 12 is collected in the upper header 14 and then led out to the outside through a steam lead pipe (not shown) and supplied to a load device (not shown). Further, the combustion gas generated by the combustion of the mixed gas is discharged from the exhaust cylinder 80 to the outside. When a variation in the combustion air flow rate is newly detected by the air differential pressure sensor 33, the opening degree setting unit 91 newly sets an opening degree value corresponding to the combustion air flow rate, and the above-described processing. The opening control unit 95 controls the opening of the flow rate adjustment valve 56 based on the corrected opening value by performing the same correction process as described above.

  According to the boiler device 1 of 1st Embodiment demonstrated above, there exist the following effects.

  The boiler apparatus 1 according to the first embodiment includes a storage unit 72 that stores the flow rate of combustion air and the opening value of the flow rate adjustment valve 56 in association with each other, and the flow rate of combustion air detected by the air differential pressure sensor 33. The opening degree setting unit 91 that sets the opening degree value based on the temperature, and the temperature that corrects the opening degree value based on the temperature detected by the fuel gas temperature sensor 57 so that the mass flow rate of the fuel gas becomes a predetermined value. The correction part 92 and the opening degree control part 95 which controls the opening degree of the flow regulating valve 56 based on the correction opening value corrected by the temperature correction part 92 are provided.

  As a result, even when the temperature variation occurs in the fuel gas, the opening degree value is corrected by the temperature correction unit 92 and the mass flow rate is maintained at a predetermined value, so that the variation in the air ratio caused by the temperature variation is effective. Therefore, the combustion control of the boiler device 1 can be performed stably and efficiently.

  Next, the boiler apparatus of 2nd Embodiment is demonstrated. FIG. 4 is a diagram schematically illustrating the boiler device 201 according to the second embodiment. FIG. 5 is a block diagram illustrating a configuration of the control unit 271 according to the second embodiment. In addition, about the structure similar to 1st Embodiment, the same code | symbol may be attached | subjected and the description may be abbreviate | omitted.

  As shown in FIG. 4, the boiler device 201 of the second embodiment further includes a calorimeter 53 in addition to the configuration of the first embodiment. The calorimeter 53 is a calorific value detection unit that acquires the calorific value of the fuel gas. The calorimeter 53 is disposed downstream of the fuel gas flow meter 52 in the fuel supply line 51 and upstream of the flow rate adjustment valve 56. The calorimeter 53 is electrically connected to the control device 70, and the control device 70 acquires the heat amount of the fuel gas based on the detection signal of the calorimeter 53. As the calorimeter 53, an appropriate one such as one that samples and measures the fuel gas flowing through the fuel supply line 51 and acquires the amount of heat can be adopted.

  Moreover, the boiler apparatus 201 of 2nd Embodiment differs in the method of acquiring a correction | amendment opening degree value from the structure of the boiler apparatus 1 of 1st Embodiment. The control of the flow rate adjustment valve 56 by the control unit 271 of the second embodiment will be described. As shown in FIG. 5, the control unit 271 includes an opening setting unit 91, a temperature correction unit 92, a pressure correction unit 93, a heat amount correction unit 94, and an opening control unit 95. The control unit 271 of the second embodiment is configured to further include a pressure correction unit 93 and a heat amount correction unit 94 in addition to the configuration of the control unit 71 of the first embodiment.

  Similarly to the first embodiment, the temperature correction unit 92 corrects the opening value according to the temperature fluctuation of the fuel gas so that the mass flow rate of the fuel gas becomes constant. The details of the correction process are the same as in the first embodiment.

  The pressure correction unit 93 corrects the opening value according to the pressure fluctuation of the fuel gas so that the mass flow rate of the fuel gas becomes constant. A pressure difference between the pressure of the fuel gas detected by the fuel gas pressure sensor 58 and a reference pressure set as a predetermined condition is detected as a pressure fluctuation. The pressure correction unit 93 performs correction to suppress the influence of the mass flow rate fluctuation caused by the pressure fluctuation. For example, when the fuel gas pressure is rising without temperature fluctuations, the mass flow rate of the fuel gas increases, so the opening value is corrected so that the flow rate (volume flow rate) of the fuel gas decreases. To do. Similarly, when the pressure of the fuel gas is decreasing, the opening degree value is corrected so that the flow rate of the fuel gas is increased.

  The calorific value correcting unit 94 corrects the opening value based on the calorific value detected by the calorimeter 53. Since the required supply amount of fuel gas with respect to the supply amount of combustion air is set based on the reference heat amount, if the heat amount changes, the required supply amount of fuel gas with respect to the supply amount of combustion air also changes. Therefore, in the present embodiment, a configuration is adopted in which a deviation in the required supply amount of the fuel gas due to the heat amount fluctuation with respect to the reference heat amount set as the predetermined condition is corrected. That is, the heat quantity correction unit 94 performs correction for adjusting the flow rate of the fuel gas so as to correspond to the change in the required supply amount of the fuel gas caused by the change in the heat quantity. For example, when the amount of heat detected by the calorimeter 53 is large with respect to a reference heat amount set in advance in the fuel gas supplied to the fuel supply unit 50, the opening value is set so that the flow rate of the fuel gas becomes small. to correct. Similarly, when the amount of heat is smaller than the reference amount of heat, the opening degree value is corrected so that the flow rate of the fuel gas is increased.

  The storage unit 72 stores a function formula or table data for correcting the opening value based on the value of the mass flow rate under the predetermined conditions, temperature fluctuation, pressure fluctuation, and heat quantity fluctuation. The temperature correction unit 92, the pressure correction unit 93, and the heat amount correction unit 94 read out necessary information from the storage unit 72 during the correction process, and correct the opening value. In the present embodiment, the opening value set by the opening setting unit 91 is corrected by the temperature correction unit 92 and the pressure correction unit 93, and the corrected opening value reflecting the temperature fluctuation and the pressure fluctuation is calculated. Is done. The correction based on the heat amount difference by the heat amount correction unit 94 is further performed on the corrected opening value, and the heat amount fluctuation acquired by the heat amount correction unit 94 is reflected in the correction opening value.

  The opening degree control unit 95 controls the opening degree of the flow rate adjustment valve 56 based on the corrected opening value corrected by the temperature correction unit 92, the pressure correction unit 93, and the heat amount correction unit 94. As a result, the temperature fluctuation, pressure fluctuation and heat quantity fluctuation are reflected in the actual opening of the flow rate adjusting valve 56, and the fuel gas is supplied by the fuel supply line 51 at an appropriate flow rate reflecting the temperature fluctuation, pressure fluctuation and heat quantity fluctuation. It is sent to the air supply duct 30.

  Also in the present embodiment, the control of the flow rate adjustment valve 56 based on the corrected opening value may be performed at all times when the boiler device 1 is normally operating, and the temperature, pressure, and amount of heat are set at predetermined intervals. And correction processing may be performed based on the temperature, pressure, and amount of heat detected at that timing.

  The boiler device 201 according to the second embodiment described above has the following effects.

  The boiler device 201 of the second embodiment is disposed on the downstream side of the flow regulating valve 56 and is detected by the fuel gas pressure sensor 58 that detects the pressure of the fuel gas flowing through the fuel supply line 51 and the fuel gas pressure sensor 58. And a pressure correction unit 93 that corrects the opening degree value based on the pressure.

  As a result, since the pressure fluctuation is reflected in addition to the temperature fluctuation, the correction for keeping the mass flow rate constant can be performed more precisely, and the combustion efficiency of the boiler device 201 can be further improved.

  A boiler device 201 according to the second embodiment is disposed in the fuel supply line 51, and includes a calorimeter 53 that detects the heat amount of the fuel gas, and a heat amount correction unit 94 that corrects the opening value based on the heat amount detected by the calorimeter 53. Are further provided.

  As a result, fluctuations in the amount of heat caused by fluctuations in the components of the fuel gas and the like are reflected in the opening value, so that the fuel gas required for the supply amount of combustion air is sent to the boiler 2 with a more accurate supply amount. Therefore, more efficient combustion control of the boiler device 201 can be realized.

  As mentioned above, although each preferred embodiment of the boiler apparatus of the present invention was described, the present invention is not limited to the above-mentioned embodiment, and can be changed suitably. For example, the heat amount correction unit 94 may be added to the configuration of the control unit 71 of the first embodiment, and the corrected opening degree value may be acquired by the temperature correction unit 92 and the heat amount correction unit 94. Thereby, in addition to the temperature fluctuation, the heat quantity fluctuation is also taken into consideration, and the constant control of the air ratio can be performed more stably. Further, the heat correction unit 94 is omitted from the configuration of the control unit 271 of the second embodiment, and the opening of the flow rate adjustment valve 56 is controlled based on the corrected opening values corrected by the temperature correction unit 92 and the pressure correction unit 93. It can also be set as the structure to do.

  In the above embodiment, the reference temperature, the reference pressure, and the reference heat amount are set in advance as predetermined conditions, but the configuration can be changed as appropriate. For example, the reference temperature, the reference pressure, and the reference heat amount are set based on values detected further upstream than the fuel supply unit 50, and the temperature fluctuation, pressure fluctuation, and heat amount fluctuation in the fuel supply line 51 are set based on the set conditions. It is also possible to adopt a configuration that performs correction reflecting the above. Moreover, it can also be set as the structure which changes the predetermined condition preset according to the use condition or environment change of the boiler apparatus 1 at an appropriate timing.

  In the above embodiment, a configuration in which the fuel gas is supplied by LNG satellite supply is adopted, but the fuel gas and the fuel gas supply source can be changed as appropriate. For example, the present invention can be applied to a configuration in which fuel gas is directly supplied from a fuel supplier through a pipeline.

1 Boiler device 2 Boiler 30 Air supply duct (Air supply line)
33 Air differential pressure sensor (Air flow rate detector)
51 Fuel supply line 53 Calorimeter (heat quantity detector)
56 Flow control valve 57 Fuel gas temperature sensor (fuel gas temperature detector)
58 Fuel gas pressure sensor (fuel gas pressure detector)
72 storage unit 91 opening setting unit 92 temperature correction unit 93 pressure correction unit 94 heat quantity correction unit 95 opening control unit 201 boiler device

Claims (3)

With a boiler,
A fuel supply line for supplying fuel gas to the boiler;
A flow rate adjusting valve disposed in the fuel supply line and capable of adjusting a flow rate of the fuel gas;
A fuel gas temperature detector for detecting the temperature of the fuel gas flowing through the fuel supply line;
An air supply line for supplying combustion air to be mixed with the fuel gas in the boiler;
An air flow rate detector for detecting the flow rate of the combustion air flowing through the air supply line;
A storage unit that stores the flow rate of the combustion air and the opening value of the flow rate adjustment valve in association with each other;
An opening setting unit that sets the opening value based on the flow rate of the combustion air detected by the air flow detection unit;
A temperature correction unit that corrects the opening value based on the temperature detected by the fuel gas temperature detection unit so that the mass flow rate of the fuel gas becomes a predetermined value;
An opening degree control unit that controls the opening degree of the flow rate adjustment valve based on the corrected opening degree value corrected by the temperature correction unit;
A boiler device comprising: A fuel gas pressure detector disposed downstream of the flow rate adjustment valve and detecting the pressure of the fuel gas flowing through the fuel supply line;
A pressure correction unit that corrects the opening value based on the pressure detected by the fuel gas pressure detection unit;
The boiler device according to claim 1, further comprising: A calorific value detection unit arranged in the fuel supply line for detecting the calorific value of the fuel gas;
A calorific value correction unit that corrects the opening value based on the calorific value detected by the calorific value detection unit;
The boiler device according to claim 1, further comprising:

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