JP5370457B2 - Heating medium boiler - Google Patents

Heating medium boiler Download PDF

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JP5370457B2
JP5370457B2 JP2011225475A JP2011225475A JP5370457B2 JP 5370457 B2 JP5370457 B2 JP 5370457B2 JP 2011225475 A JP2011225475 A JP 2011225475A JP 2011225475 A JP2011225475 A JP 2011225475A JP 5370457 B2 JP5370457 B2 JP 5370457B2
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combustion air
fuel gas
amount
differential pressure
flow rate
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JP2013087958A (en
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遼太 宮崎
一信 井上
靖国 田中
浩 小澤
貴之 阿彌
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Miura Co Ltd
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Miura Co Ltd
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Priority to CN201280043388.2A priority patent/CN103782101B/en
Priority to KR1020147002784A priority patent/KR101841508B1/en
Priority to PCT/JP2012/051157 priority patent/WO2013054546A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L15/00—Heating of air supplied for combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Air Supply (AREA)

Description

本発明は、気体燃料を燃焼させるボイラから排出される排ガスと送風機を用いてバーナに送る燃焼用空気とを熱交換して燃焼用空気を予熱するレキュペレータを備えた熱媒ボイラに関する。   The present invention relates to a heat medium boiler including a recuperator that preheats combustion air by exchanging heat between exhaust gas discharged from a boiler that burns gaseous fuel and combustion air that is sent to a burner using a blower.

熱媒ボイラは、高温の熱媒油の持つ熱を間接的に利用する装置（負荷機器）と熱媒ボイラの間を循環させながら、必要な温度（２５０℃〜３００℃）に熱媒油を加熱する装置である。熱媒ボイラは、利用される温度が高いこともあり、加熱される熱媒油の温度は３００℃近傍となるため、熱媒ボイラで加熱したあとの排ガス温度が３５０℃以上となり、持ち去られるエネルギーが大きい。例えば、小型貫流型の蒸気ボイラのボイラ効率が９２％程度であるのに対して、熱媒ボイラではボイラ効率が８０％程度と熱効率が低い。熱媒ボイラの効率を上げるためには、ボイラ排ガスと燃焼用空気の熱交換による排ガス温度の低減方法が用いられている（例えば、特許文献１、特許文献２参照。）。   The heat medium boiler circulates between the heat medium boiler (load equipment) that indirectly uses the heat of the high-temperature heat medium oil and the heat medium boiler, and heat medium oil to the required temperature (250 ° C to 300 ° C). A device for heating. The heat medium boiler may be used at a high temperature, and since the temperature of the heat medium oil to be heated is around 300 ° C., the exhaust gas temperature after being heated by the heat medium boiler becomes 350 ° C. or more, and the energy that is taken away. Is big. For example, the boiler efficiency of a small once-through steam boiler is about 92%, whereas the heat efficiency of a heat medium boiler is as low as about 80%. In order to increase the efficiency of the heat medium boiler, a method of reducing the exhaust gas temperature by heat exchange between the boiler exhaust gas and the combustion air is used (see, for example, Patent Document 1 and Patent Document 2).

特開平７−２４３６０５号公報Japanese Patent Laid-Open No. 7-243605 特開平８−３１２９４４号公報JP-A-8-312944

しかし、例えば、熱媒ボイラの熱効率を９２％程度に上げようとすると、排ガスと熱交換した燃焼用空気の温度が高くなり、燃焼用空気の膨張による体積の増加から圧力損失が大きくなって燃焼用空気量が減少する。その結果、燃料に対して燃焼用空気が不足してしまい、燃焼状態が悪化するといった問題があった。   However, for example, if the heat efficiency of the heating medium boiler is increased to about 92%, the temperature of the combustion air that exchanges heat with the exhaust gas increases, and the pressure loss increases due to the increase in volume due to the expansion of the combustion air. Air volume is reduced. As a result, there is a problem that the combustion air is insufficient with respect to the fuel and the combustion state is deteriorated.

本発明の目的は、レキュペレータを用いて排ガスと熱交換することにより燃焼用空気の温度が上昇することで、レキュペレータ部の圧力損失が高くなり燃焼用空気量が減少することによる燃焼性の悪化を防止し、安定した燃焼状態を維持することができる熱媒ボイラを提供することにある。   The object of the present invention is to increase the temperature of combustion air by exchanging heat with exhaust gas using a recuperator, thereby increasing the pressure loss of the recuperator section and reducing the amount of combustion air. An object of the present invention is to provide a heat-medium boiler that can prevent and maintain a stable combustion state.

上記の目的を達成するために、請求項１に記載の発明は、気体燃料を燃焼させるボイラから排出される排ガスと送風機を用いてバーナに送る燃焼用空気とを熱交換して燃焼用空気を予熱するレキュペレータを備えた熱媒ボイラであって、バーナへ気体燃料を供給する燃料ガス供給ラインと、前記送風機の回転数を変えるインバータと、燃料ガス流量調整弁と、燃料ガス流量調整弁を制御する制御手段と、前記レキュペレータの前後の圧力を検出して差圧を求める差圧検出手段とを設け、前記制御手段は、前記差圧検出手段で検出された差圧により燃焼用空気量を演算し、この燃焼用空気量に応じて前記燃料ガス流量調整弁を制御し、前記燃焼用空気量の変化が所定範囲を超えたら、前記制御手段は燃焼用空気量が所定範囲内になるようインバータの周波数を調整するとともに、前記燃焼用空気量に合わせて燃料ガス流量調整弁を制御することを特徴とする。   In order to achieve the above object, the invention described in claim 1 is configured to exchange heat between exhaust gas discharged from a boiler that burns gaseous fuel and combustion air that is sent to a burner using a blower. A heating medium boiler with a recuperator for preheating, which controls a fuel gas supply line that supplies gaseous fuel to the burner, an inverter that changes the rotational speed of the blower, a fuel gas flow rate adjustment valve, and a fuel gas flow rate adjustment valve And a differential pressure detection means for detecting a pressure before and after the recuperator to obtain a differential pressure. The control means calculates a combustion air amount from the differential pressure detected by the differential pressure detection means. Then, the fuel gas flow rate adjusting valve is controlled in accordance with the combustion air amount, and when the change in the combustion air amount exceeds a predetermined range, the control means controls the inverter so that the combustion air amount is within the predetermined range. Thereby adjusting the frequency of the motor, and controls the fuel gas flow control valve in accordance with the said combustion air amount.

請求項１に記載の発明によれば、レキュペレータにより排ガスと熱交換して燃焼用空気が高温となり、レキュペレータの入口側と出口側の圧力差に変化が生じたとき、前記制御手段が、前記差圧検出手段で検出された差圧により燃焼用空気量を演算し、この燃焼用空気量に応じて前記燃料ガス流量調整弁を制御し、減少した燃焼用空気量に応じて燃料ガス流量を減少させるので、安定した燃焼状態を維持することができる。また、前記燃焼用空気量の変化が所定範囲を超えても、前記制御手段が燃焼用空気量を所定範囲内になるようインバータの周波数を調整するとともに、前記燃焼用空気量に合わせて燃料ガス流量調整弁を制御するので、燃焼量が大きく変化せず、安定した燃焼性を維持できるとともに熱媒油の温度を所定温度に加熱することができる。   According to the first aspect of the present invention, when the combustion air becomes a high temperature by exchanging heat with the exhaust gas by the recuperator and the pressure difference between the inlet side and the outlet side of the recuperator changes, the control means The amount of combustion air is calculated from the differential pressure detected by the pressure detection means, the fuel gas flow rate adjusting valve is controlled according to the amount of combustion air, and the fuel gas flow rate is decreased according to the decreased amount of combustion air. Therefore, a stable combustion state can be maintained. Further, even if the change in the combustion air amount exceeds a predetermined range, the control means adjusts the frequency of the inverter so that the combustion air amount falls within the predetermined range, and the fuel gas is adjusted in accordance with the combustion air amount. Since the flow rate adjusting valve is controlled, the amount of combustion does not change greatly, stable combustion properties can be maintained, and the temperature of the heat transfer oil can be heated to a predetermined temperature.

本発明によれば、レキュペレータの入口側と出口側の圧力差に基づいて燃焼用空気量を演算し、燃焼用空気の温度変化によって前記燃焼用空気量に変化が生じたとき、変化した燃焼用空気に応じて空燃比が一定になるように燃料ガス流量を変化させるので、安定した燃焼状態を維持することができる。また、前記燃焼用空気量の変化が所定範囲を超えたら、燃焼用空気量を所定範囲内になるようインバータの周波数を調整するとともに、前記燃焼用空気量に合わせて燃料ガス流量を調整するので、燃焼量が大きく変化せず、安定した燃焼性を維持できるとともに熱媒油の温度を所定温度に加熱することができる。
さらに、特定の燃焼量、熱媒油の温度に対応した前記レキュペレータの入口側と出口側の差圧、差圧に対応したインバータの周波数のそれぞれの数値を記憶し、前記インバータの周波数を前記検出したレキュペレータの入口側と出口側の差圧に対応した前記記憶している数値の周波数に制御するので、燃焼量が一定の状態で燃焼用空気量を燃焼量に追従させることができ、安定した燃焼性を維持するとともに、熱媒油の温度を所定温度に加熱することができる。 According to the present invention, the combustion air amount is calculated based on the pressure difference between the inlet side and the outlet side of the recuperator, and when the combustion air amount changes due to the temperature change of the combustion air, the changed combustion air amount Since the fuel gas flow rate is changed so that the air-fuel ratio becomes constant according to air, a stable combustion state can be maintained. When the change in the combustion air amount exceeds a predetermined range, the frequency of the inverter is adjusted so that the combustion air amount is within the predetermined range, and the fuel gas flow rate is adjusted in accordance with the combustion air amount. In addition, the combustion amount does not change greatly, the stable combustibility can be maintained, and the temperature of the heat transfer oil can be heated to a predetermined temperature.
Furthermore, the numerical values of the inlet pressure and the outlet pressure differential corresponding to the specific combustion amount and the temperature of the heat transfer oil, and the inverter frequency corresponding to the differential pressure are stored, and the inverter frequency is detected. Since the frequency of the stored numerical value corresponding to the pressure difference between the inlet side and the outlet side of the recuperator is controlled, the combustion air amount can be made to follow the combustion amount with a constant combustion amount, and stable. While maintaining combustibility, the temperature of the heat transfer oil can be heated to a predetermined temperature.

本発明に係る熱媒ボイラの実施の形態の一例を示す概略構成図である。It is a schematic structure figure showing an example of an embodiment of a heat carrier boiler concerning the present invention.

以下、本発明に係る熱媒ボイラを実施するための形態を、図面に示す実施例を参照して詳細に説明する。
図１は本発明に係る熱媒ボイラの実施の形態の一例を示す概略構成図である。 Hereinafter, the form for implementing the heat-medium boiler which concerns on this invention is demonstrated in detail with reference to the Example shown on drawing.
FIG. 1 is a schematic configuration diagram showing an example of an embodiment of a heat medium boiler according to the present invention.

本例の熱媒ボイラ１は、上部にバーナ２が配置され、熱媒油加熱管３をコイル状に形成した缶体４の内側に燃焼室５を形成している。バーナ２は缶体４の上部に設けられたウインドボックス６に取り付けられており、ウインドボックス６に送気ダクト７を介して燃焼用空気を送り込む送風機８を備えている。送風機８にはインバータ９が備えられており、インバータ９の周波数を制御することにより送風機８の回転数を制御して燃焼用空気量を制御できるようになっている。缶体４には、燃焼室５で燃焼しコイル状の熱媒油加熱管３の隙間を通過した排ガスを大気に放出する排ガスダクト１０が接続されている。   In the heat medium boiler 1 of this example, a burner 2 is disposed at the top, and a combustion chamber 5 is formed inside a can body 4 in which a heat medium oil heating tube 3 is formed in a coil shape. The burner 2 is attached to a wind box 6 provided on the upper portion of the can 4, and includes a blower 8 that sends combustion air to the wind box 6 through an air supply duct 7. The blower 8 is provided with an inverter 9, and by controlling the frequency of the inverter 9, the rotational speed of the blower 8 can be controlled to control the amount of combustion air. Connected to the can 4 is an exhaust gas duct 10 that discharges the exhaust gas that burns in the combustion chamber 5 and passes through the gap between the coiled heat transfer oil heating tubes 3 to the atmosphere.

また、排ガスダクト１０と送気ダクト７とに接続するレキュペレータ１１を備えており、排ガスダクト１０を流通する排ガスと送気ダクト７を流通する燃焼用空気とを熱交換して燃焼用空気を予熱するようになっている。
バーナ２には、燃料ガスを供給する燃料ガス供給ライン１２が接続されている。燃料ガス供給ライン１２には、バーナ２へ燃料ガスを供給する燃料ガス流量調整弁１３が設けられている。 In addition, a recuperator 11 connected to the exhaust gas duct 10 and the air supply duct 7 is provided, and the combustion air preheated by exchanging heat between the exhaust gas flowing through the exhaust gas duct 10 and the combustion air flowing through the air supply duct 7. It is supposed to be.
A fuel gas supply line 12 for supplying fuel gas is connected to the burner 2. The fuel gas supply line 12 is provided with a fuel gas flow rate adjustment valve 13 for supplying fuel gas to the burner 2.

また、送気ダクト７には、レキュペレータ１１の入口側と出口側に設けた圧力センサ１４で構成した差圧検出手段１５が設けられており、差圧検出手段１５で送気ダクト７を流れるレキュペレータ１１の入口側と出口側の燃焼用空気の圧力を検出してその差圧を求め、制御手段１６に発信するようになっている。   Further, the air supply duct 7 is provided with a differential pressure detection means 15 constituted by pressure sensors 14 provided on the inlet side and the outlet side of the recuperator 11, and the recuperator that flows through the air supply duct 7 by the differential pressure detection means 15. 11 detects the pressure of the combustion air on the inlet side and the outlet side 11, obtains the differential pressure, and transmits it to the control means 16.

この制御手段１６は、差圧検出手段１５で検出されたレキュペレータ１１の入口側と出口側の差圧により燃焼用空気量を演算し、この燃焼用空気量に応じて燃料ガス流量調整弁１３を制御し、燃焼用空気量に応じた燃料ガスをバーナ２に供給させ、燃焼用空気量の変化が所定範囲を超えたら、燃焼用空気量が所定範囲内になるようインバータ９の周波数を調整するとともに、燃焼用空気量に合わせて燃料ガス流量調整弁１３を制御する第１機能を有している。前記の燃焼用空気量に関する所定範囲とは、熱媒油の温度を維持するために必要とされる燃焼量であり、この燃焼量に対して所定の空燃比になる燃焼用空気量の範囲を指す。   The control means 16 calculates the combustion air amount based on the differential pressure between the inlet side and the outlet side of the recuperator 11 detected by the differential pressure detection means 15, and controls the fuel gas flow rate adjusting valve 13 according to the combustion air quantity. The fuel gas corresponding to the amount of combustion air is supplied to the burner 2, and when the change in the amount of combustion air exceeds a predetermined range, the frequency of the inverter 9 is adjusted so that the amount of combustion air falls within the predetermined range. In addition, it has a first function of controlling the fuel gas flow rate adjustment valve 13 in accordance with the amount of combustion air. The predetermined range related to the amount of combustion air is the amount of combustion required to maintain the temperature of the heat transfer oil, and the range of the amount of combustion air that becomes a predetermined air-fuel ratio with respect to this amount of combustion. Point to.

また、前記制御手段１６は、特定の燃焼量、熱媒温度に対応したレキュペレータ１１の入口側と出口側の差圧、差圧に対応したインバータ９の周波数のそれぞれの数値を記憶しており、インバータ９の周波数を検出された差圧に対応した前記記憶している周波数に制御し、所望の熱媒油の温度に加熱するために必要な燃焼量に応じて供給される燃料ガス流量に対して空燃比が一定になるように燃焼用空気量を供給させる第２機能を有している。
そして、前記第１機能と第２機能の優先順位にあっては、任意に選択できるようになっている。 The control means 16 stores the numerical values of the frequency of the inverter 9 corresponding to the differential pressure and the differential pressure between the inlet side and the outlet side of the recuperator 11 corresponding to a specific combustion amount and heat medium temperature, The frequency of the inverter 9 is controlled to the stored frequency corresponding to the detected differential pressure, and the fuel gas flow rate supplied in accordance with the combustion amount necessary for heating to the desired heat transfer oil temperature And has a second function of supplying the combustion air amount so that the air-fuel ratio becomes constant.
The priority order of the first function and the second function can be arbitrarily selected.

このように構成した本例の熱媒ボイラ１によれば、レキュペレータ１１で排ガスダクト１０を流通する排ガスと送気ダクト７を流通する燃焼用空気とを熱交換して燃焼用空気を予熱すると、高温となった燃焼用空気は膨張して体積が増し、流速が早くなりレキュペレータ１１部の圧力損失が大きくなって風量が減少する。
本例では、レキュペレータ１１の入口側と出口側に設けた圧力センサ１４で構成した差圧検出手段１５により送気ダクト７を流れるレキュペレータ１１の入口側と出口側の燃焼用空気の圧力を検出してその差圧を求め、制御手段１６に発信する。 According to the heat medium boiler 1 of this example configured as described above, when the recuperator 11 heat-exchanges the exhaust gas flowing through the exhaust gas duct 10 and the combustion air flowing through the air supply duct 7 to preheat the combustion air, The high-temperature combustion air expands to increase its volume, increase the flow velocity, increase the pressure loss in the recuperator 11 part, and reduce the air volume.
In this example, the pressure of combustion air on the inlet side and outlet side of the recuperator 11 flowing through the air supply duct 7 is detected by a differential pressure detecting means 15 constituted by pressure sensors 14 provided on the inlet side and outlet side of the recuperator 11. The differential pressure is obtained and transmitted to the control means 16.

制御手段１６にあって、第１機能が選択されている場合は、差圧検出手段１５で検出されたレキュペレータ１１の入口側と出口側の差圧により燃焼用空気量を演算し、算出された燃焼用空気量に応じて燃料ガス流量調整弁１３を制御する。すなわち、排ガスと熱交換して高温となって膨張して体積が増し、流速が早くなり減少した燃焼用空気量に応じて燃料ガス流量を減少させる。
また、前記燃焼用空気量の変化が所定範囲を超えたら、すなわち、燃焼用空気量の減少が特定の燃焼量、熱媒温度を維持するために必要とされる燃焼用空気量の範囲を超えたら、燃焼用空気量が所定範囲内になるようインバータ９の周波数を調整するとともに、燃焼用空気量に合わせて燃料ガス流量調整弁１３を制御し、特定の燃焼量、熱媒温度を維持するために必要とされる燃焼用空気量とするとともに、この燃焼用空気量に応じた燃料ガス流量に調整する。 When the first function is selected in the control means 16, the combustion air amount is calculated by calculating the pressure difference between the inlet side and the outlet side of the recuperator 11 detected by the differential pressure detecting means 15. The fuel gas flow rate adjustment valve 13 is controlled in accordance with the combustion air amount. That is, heat exchange with the exhaust gas expands to a high temperature, the volume increases, the flow rate increases, and the fuel gas flow rate is reduced in accordance with the reduced amount of combustion air.
In addition, if the change in the combustion air amount exceeds a predetermined range, that is, the reduction in the combustion air amount exceeds the range of the combustion air amount required to maintain a specific combustion amount and heat medium temperature. Then, the frequency of the inverter 9 is adjusted so that the amount of combustion air is within a predetermined range, and the fuel gas flow rate adjustment valve 13 is controlled in accordance with the amount of combustion air to maintain a specific combustion amount and heat medium temperature. Therefore, the amount of combustion air required for this is adjusted, and the fuel gas flow rate is adjusted according to the amount of combustion air.

制御手段１６にあって、第２機能が選択されている場合、差圧検出手段１５で検出されたレキュペレータ１１の入口側と出口側の差圧を制御手段１６に発信すると、制御手段１６は、インバータ９の周波数を、差圧検出手段１５で検出されたレキュペレータ１１の入口側と出口側の差圧に対応した前記記憶している数値の周波数に制御する。すなわち、排ガスと熱交換して高温となった燃焼用空気は膨張して体積が増し、流速が早くなり圧力損失が大きくなることにより減少した燃焼用空気量を、特定の燃焼量、熱媒温度に応じて供給される燃料ガス供給量に応じた量に増加させる。   When the second function is selected in the control unit 16, when the differential pressure on the inlet side and the outlet side of the recuperator 11 detected by the differential pressure detection unit 15 is transmitted to the control unit 16, the control unit 16 The frequency of the inverter 9 is controlled to the stored numerical frequency corresponding to the differential pressure on the inlet side and the outlet side of the recuperator 11 detected by the differential pressure detecting means 15. That is, the combustion air heated to a high temperature by exchanging heat with exhaust gas expands and increases in volume, and the amount of combustion air reduced by increasing the flow velocity and pressure loss becomes the specific combustion amount and heat medium temperature. The amount is increased according to the amount of fuel gas supplied.

１ 熱媒ボイラ
２ バーナ
３ 熱媒油加熱管
４ 缶体
５ 燃焼室
６ ウインドボックス
７ 送気ダクト
８ 送風機
９ インバータ
１０ 排ガスダクト
１１ レキュペレータ
１２ 燃料ガス供給ライン
１３ 燃料ガス流量調整弁
１４ 圧力センサ
１５ 差圧検出手段
１６ 制御手段 1 Heat medium boiler 2 Burner 3 Heat medium oil heating tube 4 Can body 5 Combustion chamber 6 Wind box 7 Air supply duct 8 Blower 9 Inverter 10 Exhaust gas duct 11 Recuperator 12 Fuel gas supply line 13 Fuel gas flow rate adjustment valve 14 Pressure sensor 15 Difference Pressure detection means 16 Control means

Claims (1)

気体燃料を燃焼させるボイラから排出される排ガスと送風機を用いてバーナに送る燃焼用空気とを熱交換して燃焼用空気を予熱するレキュペレータを備えた熱媒ボイラであって、
バーナへ気体燃料を供給する燃料ガス供給ラインと、前記送風機の回転数を変えるインバータと、燃料ガス流量調整弁と、燃料ガス流量調整弁を制御する制御手段と、前記レキュペレータの前後の圧力を検出して差圧を求める差圧検出手段とを設け、前記制御手段は、前記差圧検出手段で検出された差圧により燃焼用空気量を演算し、この燃焼用空気量に応じて前記燃料ガス流量調整弁を制御し、前記燃焼用空気量の変化が所定範囲を超えたら、前記制御手段は燃焼用空気量が所定範囲内になるようインバータの周波数を調整するとともに、前記燃焼用空気量に合わせて燃料ガス流量調整弁を制御することを特徴とする熱媒ボイラ。 A heat medium boiler including a recuperator that preheats combustion air by exchanging heat between exhaust gas discharged from a boiler that burns gaseous fuel and combustion air that is sent to a burner using a blower,
A fuel gas supply line for supplying gaseous fuel to the burner, an inverter for changing the rotation speed of the blower, a fuel gas flow rate adjustment valve, a control means for controlling the fuel gas flow rate adjustment valve, and pressures before and after the recuperator are detected. Differential pressure detection means for obtaining a differential pressure, and the control means calculates a combustion air amount based on the differential pressure detected by the differential pressure detection means, and the fuel gas according to the combustion air amount When the flow rate adjustment valve is controlled and the change in the combustion air amount exceeds a predetermined range, the control means adjusts the frequency of the inverter so that the combustion air amount is within the predetermined range, and the combustion air amount is adjusted to the combustion air amount. A heat medium boiler characterized by controlling the fuel gas flow rate adjusting valve together.
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