JPS6225680Y2 - - Google Patents
Info
- Publication number
- JPS6225680Y2 JPS6225680Y2 JP1983019820U JP1982083U JPS6225680Y2 JP S6225680 Y2 JPS6225680 Y2 JP S6225680Y2 JP 1983019820 U JP1983019820 U JP 1983019820U JP 1982083 U JP1982083 U JP 1982083U JP S6225680 Y2 JPS6225680 Y2 JP S6225680Y2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- oil
- temperature
- heat exchanger
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000446 fuel Substances 0.000 claims description 54
- 239000007789 gas Substances 0.000 claims description 39
- 239000002253 acid Substances 0.000 claims description 23
- 238000002485 combustion reaction Methods 0.000 claims description 23
- 239000002918 waste heat Substances 0.000 claims description 11
- 238000011084 recovery Methods 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 8
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Landscapes
- Control Of Combustion (AREA)
- Feeding And Controlling Fuel (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は燃焼炉における廃熱回収技術の分野に
属するもので、廃熱回収装置に関するものであ
る。[Detailed Description of the Invention] (Field of Industrial Application) The present invention belongs to the field of waste heat recovery technology in combustion furnaces, and relates to a waste heat recovery device.
（従来技術）
従来、燃焼炉の廃熱回収用に用いられる熱交換
器は、該熱交換器の出口の排ガス温度を酸露点温
度（たとえば、硫酸液が生成する温度）以上に設
定し、低燃焼領域での熱交換器の酸腐食を防止し
て使用に供している。しかし、この場合、高燃焼
領域では熱交換器の出口の排ガス温度は、酸露点
温度より高い温度となり、廃熱回収においては不
充分で、エネルギーの損失を招き問題点となつて
いる。(Prior art) Conventionally, a heat exchanger used for waste heat recovery from a combustion furnace is designed to set the exhaust gas temperature at the outlet of the heat exchanger to a temperature higher than the acid dew point temperature (for example, the temperature at which sulfuric acid liquid is produced), It prevents acid corrosion of the heat exchanger in the combustion area before use. However, in this case, in the high combustion region, the exhaust gas temperature at the outlet of the heat exchanger is higher than the acid dew point temperature, which is insufficient for waste heat recovery and causes a problem of energy loss.
（考案の目的）
本考案は、上記従来技術における問題点に鑑み
てなされたものであり、熱交換器の出口の排ガス
温度を酸露点温度以下に設定することにより、熱
交換器による廃熱回収効果を高めることを可能と
した廃熱回収装置を提供することを目的とするも
のである。(Purpose of the invention) The present invention was made in view of the problems in the conventional technology described above. By setting the exhaust gas temperature at the outlet of the heat exchanger to below the acid dew point temperature, the present invention recovers waste heat using the heat exchanger. The purpose of the present invention is to provide a waste heat recovery device that can enhance the effectiveness.
（考案の構成）
上記目的を達成させるため、本考案の廃熱回収
装置の構成は、油燃料およびガス燃料のいずれを
も燃焼可能なバーナを有する燃焼炉と、排ガス中
の熱エネルギーを回収する熱交換器と、該熱交換
器の出口における排ガスの温度を測定する温度計
と、該温度計の温度信号の入力により予め設定し
た油燃料の酸露点温度と比較演算して油燃料若し
くはガス燃料若しくはガス燃料の選択信号を出力
する調節器と、該調節器によつて制御されて前記
バーナに油燃料若しくはガス燃料を流量制御する
と共に供給する燃料切替弁と、からなり、油燃料
の酸露点温度より高い燃焼領域では油燃料を使用
し、酸露点温度以下ではガス燃料を使用するよう
にしたことを特徴としている。(Structure of the invention) In order to achieve the above object, the structure of the waste heat recovery device of the invention includes a combustion furnace having a burner capable of burning both oil fuel and gas fuel, and recovering thermal energy from exhaust gas. A heat exchanger, a thermometer that measures the temperature of the exhaust gas at the outlet of the heat exchanger, and a temperature signal from the thermometer that is input to compare and calculate the acid dew point temperature of the oil fuel, which is set in advance, to determine whether the oil fuel or gas fuel Alternatively, it comprises a regulator that outputs a gas fuel selection signal, and a fuel switching valve that is controlled by the regulator to control the flow rate and supply oil fuel or gas fuel to the burner, and is configured to control the acid dew point of the oil fuel. It is characterized in that oil fuel is used in the combustion range above the temperature, and gas fuel is used in the combustion range below the acid dew point temperature.
（実施例）
以下、本考案の一実施例を図に基づいて説明す
る。(Example) Hereinafter, an example of the present invention will be described based on the drawings.
第１図および第２図において、１は油燃料およ
びガス燃料のいずれをも燃焼可能なバーナを収容
するバーナボツクス２を備えた燃焼炉であり、該
燃焼炉１より出た排ガスは熱交換器３によりその
廃熱が回収されて集塵機４を経て煙突５より大気
に放出される。熱交換器３の出口には温度計６が
設けられ、熱交換器３の出口における排ガスの温
度を測定し、該温度による信号を調節器７に入力
する。 1 and 2, 1 is a combustion furnace equipped with a burner box 2 that accommodates a burner capable of burning both oil fuel and gas fuel, and the exhaust gas discharged from the combustion furnace 1 is passed through a heat exchanger. 3, the waste heat is recovered, passed through a dust collector 4, and released into the atmosphere from a chimney 5. A thermometer 6 is provided at the outlet of the heat exchanger 3 to measure the temperature of the exhaust gas at the outlet of the heat exchanger 3 and input a signal based on the temperature to the regulator 7.
調節器７においては、入力信号である前記温度
を、予め設定した油燃料の酸露点温度と比較演算
して油燃料若しくはガス燃料の選択信号を出力す
る。８は油燃料系統を示しており、９は油噴出ポ
ンプ、１０は油流量計、１１は油燃料の流量制御
も可能な油燃料切替弁を示している。また、１２
はガス燃料系統を示しており、１３はガス燃料の
流量制御も可能なガス燃料切替弁を示している。
また、１４は油噴霧媒体系統を示しており、１５
は油噴霧媒体切替弁を示している。１６は押込送
風器を示している。 The regulator 7 compares the temperature, which is the input signal, with a preset acid dew point temperature of the oil fuel and outputs an oil fuel or gas fuel selection signal. Reference numeral 8 indicates an oil fuel system, 9 an oil jet pump, 10 an oil flow meter, and 11 an oil fuel switching valve which can also control the flow rate of oil fuel. Also, 12
indicates a gas fuel system, and 13 indicates a gas fuel switching valve that can also control the flow rate of gas fuel.
Further, 14 indicates an oil spray medium system, and 15
indicates the oil spray medium switching valve. 16 indicates a forced air blower.
なお、１７は燃焼排ガス系統、１８は熱交換器
出口燃焼排ガス温度信号、１９は油燃料酸露点温
度信号（切替基準信号）をそれぞれ示しており、
２０，２１，２２はそれぞれ切換弁操作信号を示
している。 In addition, 17 indicates a combustion exhaust gas system, 18 indicates a heat exchanger outlet combustion exhaust gas temperature signal, and 19 indicates an oil/fuel/acid dew point temperature signal (switching reference signal).
Reference numerals 20, 21, and 22 indicate switching valve operation signals, respectively.
次に本実施例の作用を説明する。 Next, the operation of this embodiment will be explained.
燃焼炉１の中高燃焼域では油燃料を使用し、低
燃焼域ではガス燃料を使用する。その切替動作
は、油燃料の酸露点温度信号１９を基準入力とし
ている調節器７に、熱交換器３の出口に設けた温
度計６の温度信号を入力させて前記酸露点温度信
号１９と比較させる。熱交換器出口排ガス温度が
油燃料の酸露点温度より高いときは、調節器７か
ら切換弁操作信号２０，２１，２２を出力させ、
油燃料切替弁１１と油噴霧媒体切替弁１５を開と
し、ガス燃料切替弁１３を閉とする。これによ
り、油燃料が燃焼炉１に供給される。また、熱交
換器出口排ガス温度が油燃料の酸露点温度より低
いときは、調節器７から切換弁操作信号２０，２
１，２２を出力させ、油燃料切替弁１１と油噴霧
媒体切替弁１５を閉とし、ガス燃料切替弁１３を
開とする。これにより、ガス燃料が燃焼炉１に供
給される。 Oil fuel is used in the medium and high combustion range of the combustion furnace 1, and gas fuel is used in the low combustion range. The switching operation is performed by inputting the temperature signal of the thermometer 6 provided at the outlet of the heat exchanger 3 to the regulator 7, which uses the acid dew point temperature signal 19 of the oil fuel as a reference input, and comparing it with the acid dew point temperature signal 19. let When the heat exchanger outlet exhaust gas temperature is higher than the acid dew point temperature of the oil fuel, the regulator 7 outputs switching valve operation signals 20, 21, 22,
The oil fuel switching valve 11 and the oil spray medium switching valve 15 are opened, and the gas fuel switching valve 13 is closed. Thereby, oil fuel is supplied to the combustion furnace 1. In addition, when the exhaust gas temperature at the heat exchanger outlet is lower than the acid dew point temperature of the oil fuel, the switching valve operation signals 20, 2 are sent from the regulator 7.
1 and 22 are output, the oil-fuel switching valve 11 and the oil spray medium switching valve 15 are closed, and the gas-fuel switching valve 13 is opened. Thereby, gas fuel is supplied to the combustion furnace 1.
第２図に示す直線ａは、従来の油燃料専用燃焼
時の燃焼負荷に対する熱交換器出口排ガス温度の
特性を示し、直線ｂは本考案における燃焼負荷に
対する熱交換器出口排ガス温度の特性を示してい
る。直線ｂの特性が得られるように設計すると、
低燃焼負荷域では、前記直線ｂは直線ｃより低下
し、領域ｄにおいては、熱交換器が酸腐食により
腐食するので、油燃料燃焼ガスの酸露点温度より
低いガス燃料ガス（酸露点温度約80℃）を燃焼さ
せるように制御するもので、従来の排ガス温度を
制御するものではなく、酸露点温度を制御するも
のであつて、図から明らかなように斜線部分に相
当する熱エネルギーの回収効果が得られる。な
お、破線ｃは油燃料の酸露点温度を示し、領域ｄ
はガス燃料使用域を、領域ｅは油燃料使用域を示
している。 Straight line a shown in Fig. 2 shows the characteristic of the heat exchanger outlet exhaust gas temperature with respect to the combustion load during conventional combustion exclusively for oil fuel, and straight line b shows the characteristic of the heat exchanger outlet exhaust gas temperature with respect to the combustion load in the present invention. ing. When designed to obtain the characteristics of straight line b,
In the low combustion load region, the straight line b is lower than the straight line c, and in the region d, the heat exchanger corrodes due to acid corrosion, so the gas fuel gas (with an acid dew point temperature of approximately 80℃), and it controls the acid dew point temperature rather than the conventional exhaust gas temperature, and as it is clear from the figure, the thermal energy corresponding to the shaded area is recovered. Effects can be obtained. Note that the broken line c indicates the acid dew point temperature of the oil fuel, and the area d
indicates the gas fuel use area, and area e indicates the oil fuel use area.
（考案の効果）
以上述べた如く、本考案によれば、熱交換器出
口排ガス温度が油燃料の酸露点温度よりも高いと
きには油燃料を使用し、逆に低いときは、ガス燃
料を使用する構成とし油燃料燃焼ガスの酸露点温
度と、それより低いガス燃料燃焼ガスの酸露点温
度のそれぞれ独自の酸露点温度を利用したので、
熱交換器の酸腐食を確実に防止し得て、しかも、
熱交換器出口の温度は低く設定できるので廃熱回
収効果が大となり、さらには、熱交換器の耐久性
の向上も果せる廃熱回収装置が提供できる。(Effects of the invention) As described above, according to the invention, oil fuel is used when the exhaust gas temperature at the exit of the heat exchanger is higher than the acid dew point temperature of the oil fuel, and conversely, when it is lower, gas fuel is used. Since the structure uses the acid dew point temperature of oil fuel combustion gas and the lower acid dew point temperature of gas fuel combustion gas, each has its own acid dew point temperature.
It can reliably prevent acid corrosion of heat exchangers, and
Since the temperature at the outlet of the heat exchanger can be set low, the waste heat recovery effect is increased, and furthermore, it is possible to provide a waste heat recovery device that can improve the durability of the heat exchanger.
第１図は、本考案に係る一実施例の系統図、第
２図は熱交換器出口排ガス温度の燃焼負荷に対す
る特性を示すグラフである。
１……燃焼炉、２……バーナボツクス、３……
熱交換器、６……温度計、７……調節器、１１…
…油燃料切替弁、１３……ガス燃料切替弁、１５
……油噴霧媒体切替弁。
FIG. 1 is a system diagram of an embodiment of the present invention, and FIG. 2 is a graph showing the characteristics of the heat exchanger outlet exhaust gas temperature with respect to the combustion load. 1... Combustion furnace, 2... Burnabox, 3...
Heat exchanger, 6... thermometer, 7... regulator, 11...
...Oil fuel switching valve, 13...Gas fuel switching valve, 15
...Oil spray medium switching valve.
Claims (1)
バーナを有する燃焼炉と、排ガス中の熱エネルギ
ーを回収する熱交換器と、該熱交換器の出口にお
ける排ガスの温度を測定する温度計と、該温度計
の温度信号の入力により予め設定した油燃料の酸
露点温度と比較演算して油燃料及び油噴霧媒体若
しくはガス燃料の選択信号を出力する調節器と、
該調節器によつて制御されて前記バーナに油燃料
若しくはガス燃料を流量制御すると共に供給する
燃料切替弁と、前記調節器によつて制御され前記
油噴霧媒体の選択信号を出力する油噴霧媒体切替
弁と、からなることを特徴とする廃熱回収装置。 A combustion furnace having a burner capable of burning both oil fuel and gas fuel, a heat exchanger that recovers thermal energy in exhaust gas, a thermometer that measures the temperature of the exhaust gas at the outlet of the heat exchanger, and A regulator that compares and calculates a preset acid dew point temperature of the oil fuel by inputting a temperature signal from a thermometer and outputs a selection signal for oil fuel, oil spray medium, or gas fuel;
a fuel switching valve controlled by the regulator to control the flow rate and supply oil fuel or gas fuel to the burner; and an oil spray medium controlled by the regulator to output a selection signal for the oil spray medium. A waste heat recovery device comprising a switching valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982083U JPS59125000U (en) | 1983-02-14 | 1983-02-14 | Waste heat recovery equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982083U JPS59125000U (en) | 1983-02-14 | 1983-02-14 | Waste heat recovery equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59125000U JPS59125000U (en) | 1984-08-22 |
| JPS6225680Y2 true JPS6225680Y2 (en) | 1987-06-30 |
Family
ID=30150956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1982083U Granted JPS59125000U (en) | 1983-02-14 | 1983-02-14 | Waste heat recovery equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59125000U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52102810A (en) * | 1976-02-24 | 1977-08-29 | Daido Steel Co Ltd | Device for prevention of overheating of recuperator in furnace for heat treatment |
| JPS53125910A (en) * | 1977-04-11 | 1978-11-02 | Mitsubishi Heavy Ind Ltd | Temperture control method of outlet gas of reheating furnace for exhaust gas treatment equipment |
-
1983
- 1983-02-14 JP JP1982083U patent/JPS59125000U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52102810A (en) * | 1976-02-24 | 1977-08-29 | Daido Steel Co Ltd | Device for prevention of overheating of recuperator in furnace for heat treatment |
| JPS53125910A (en) * | 1977-04-11 | 1978-11-02 | Mitsubishi Heavy Ind Ltd | Temperture control method of outlet gas of reheating furnace for exhaust gas treatment equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59125000U (en) | 1984-08-22 |
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