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1.廃熱ボイラーから回収される廃熱の種類は何ですか
The principle of waste heat boiler is that the fuel oil, gas and coal are burned to produce the heat emission of high-temperature flue gas. The high-temperature flue gas first enters the furnace chamber, then enters the waste heat recovery device of the front smoke box, then enters the pyrotechnics pipe, and finally enters the waste heat recovery device of the flue pipe of the back smoke box. The high-temperature flue gas turns into low-temperature flue gas and is discharged into the atmosphere through the stack.
1. High temperature flue gas waste heat: it is a common form, its characteristics are large output, concentrated production point, strong continuity, easy to recover and use, heat absorb accounted for 40~50% of the total heat, the waste heat boiler recovery heat, can be used in production or daily life heat and power generation.
2. Residual heat from high temperature furnace slag,
3. High temperature product waste heat: such as steel billet, high temperature forging part etc,
4. The residual heat of combustible waste gas and liquid waste,
5. Residual heat of chemical reaction,
6. Residual heat of cooling medium,
7. Waste heat from condensation water.
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2.HRSGがフィン付きチューブを使用する理由
フィン付きチューブがHRSGで使用される理由：廃熱ボイラーの効率を向上させるには、煙の温度とボイラーの蒸気温度の温度差を減らす必要があります。面積、抵抗、温度差の矛盾があります。廃熱ボイラーの暖房エリアが拡大されます。流動抵抗損失を低減するために、流動面積を増やし、流速を下げることができます。ただし、低速の流れは熱伝達効率を低下させることになります。伝熱面積を増やすため; 次に、HRSGの領域は無限に増加します。スパイラルフィン付きチューブを使用すると、十分な熱伝達面積を確保し、熱伝達を向上させ、煙道ガスの抵抗を減らすことができます。
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3.ボイラーのヒント
1. The drum is connected by a riser and a downcomer to form a natural circulation loop.Upper drum is filled with water and steam mixture from circulation loop,normally there will be water steam seperating device and feeding water distribution pipe.In order to improve the quality of boiler water some boilers are also equipped with continuous sewage pipe and dosing pipe. There is a regular sewage discharge device in the lower drum. On the outer wall of the upper boiler drum of steam boiler, there are also flanged short pipes connecting the main steam pipe and the secondary steam pipe and flanges and short pipes connecting the continuous water level gauge, pressure gauge, safety valve and other accessories. There is a regular blowdown device for discharging sediment in the lower boiler drum.
2. For larger capacity boilers, simply using natural separation of steam and water can no longer meet the requirements, need to install a seperating device inside upper drum.
3. The water-cooled wall tube is usually a no.10 or no.20 seamless steel tube with an outer diameter of 51~76mm and a wall thickness of 3.5~6.0mm. The distance between the center of the tube is generally 1.25~2 times of the outer diameter of the tube.Both finned tubes and bare tubes.
4. Water - cooled walls are generally fixed on the upper, the lower can be free expansion.
5. The function of steam superheater is to heat the saturated steam drawn out of the upper drum to a certain temperature of the superheated steam.
Industrial steam is mostly saturated steam, so normally general boiler are not equipped with steam superheater. A steam superheater is installed in the boiler only if the production steam requires a higher temperature and does not require an increase in steam pressure, or if superheated steam is required in order to reduce condensation losses during steam transmission. In industrial boilers, the temperature of superheated steam is 250℃ and 350℃ for the boilers with working pressure of 1.25MPa, and 350℃ for the boilers with working pressure of 1.6MPa.
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4.ボイラーの基礎知識
ボイラーとは、特定のパラメーター（温度、圧力）と品質の蒸気または温水を生成するために、燃料燃焼または他の熱エネルギーによって放出される熱エネルギーを水または他の作動媒体を加熱するために使用する機器を指します。ボイラーの分類：アプリケーション：発電所ボイラー、工業用ボイラー蒸気：超臨界圧ボイラー、亜臨界圧ボイラー、超高圧ボイラー、高圧ボイラー、中圧ボイラー、低圧ボイラー。蒸発容量：大規模、中規模、小規模。媒体：蒸気ボイラー、温水ボイラー、有機熱媒体ボイラー熱源：石炭燃焼ボイラー、石油燃焼ボイラー、ガス燃焼ボイラー、廃熱ボイラー、電気ボイラー。構造：シェルボイラー、水管ボイラー。
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