タグアーカイブ 廃熱回収

Kiln waste heat recovery and reuse system - gas stainless steel cross flow heat exchanger scheme

The kiln waste heat recovery and reuse system aims to fully utilize the high-temperature heat in the kiln exhaust gas, and achieve a win-win situation of energy conservation and environmental protection through gas stainless steel cross flow heat exchangers. The core of this solution lies in the use of a stainless steel cross flow heat exchanger, which efficiently exchanges heat between high-temperature exhaust gas and cold air, generating hot air that can be reused.

Working principle: The exhaust gas and cold air flow in a cross flow manner inside the heat exchanger and transfer heat through the stainless steel plate wall. After releasing heat from exhaust gas, it is discharged. Cold air absorbs the heat and heats up into hot air, which is suitable for scenarios such as assisting combustion, preheating materials, or heating.

Advantages:

Efficient heat transfer: The cross flow design ensures a heat transfer efficiency of 60% -80%.
Strong durability: Stainless steel material is resistant to high temperatures and corrosion, and can adapt to complex exhaust environments.
Flexible application: Hot air can be directly fed back to the kiln or used for other processes, with significant energy savings.
System process: Kiln exhaust gas → Pre treatment (such as dust removal) → Stainless steel heat exchanger → Hot air output → Secondary utilization.

This solution is simple and reliable, with a short investment return cycle, making it an ideal choice for kiln waste heat recovery, helping enterprises reduce energy consumption and improve efficiency.

Waste heat recovery from spray painting exhaust gas

Spray coating is a surface treatment method that sprays plastic powder onto parts, widely used in various fields such as automotive, electronic products, furniture and appliances, construction industry, machinery, and public facilities. The waste heat recovery plate heat exchanger for spray coating waste gas is an energy recovery device that can recover and utilize the heat energy generated during the high-temperature baking process of spray coating.


working principle:
The plate heat exchanger for waste heat recovery from spray coating waste gas transfers the heat from the dry waste gas to other media, such as fresh air or water, to achieve energy recovery and utilization. The device consists of a series of parallel arranged metal plates, and the gas from the heat source and cold source flows cross between the plates, achieving heat transfer through thermal conduction and convective heat transfer of the metal plates.
Application areas:
Spray painted waste gas heat recovery plate heat exchangers are widely used in industries that require a large amount of thermal energy, such as metallurgy, chemical industry, building materials, machinery, electricity, etc. In these industries, the exhaust and smoke exhaust of various smelting furnaces, heating furnaces, internal combustion engines, and boilers, as well as the residual heat of flue gas from industrial kilns, are the main objects of waste heat recovery.
Product advantages:
Efficient heat transfer: The plate type gas waste heat recovery heat exchanger adopts an efficient plate design with a high total heat transfer film coefficient, which can quickly and effectively transfer heat.
Compact structure: The equipment occupies a small area, is lightweight, and has a large heat exchange area per unit volume, making it suitable for situations with limited space.
Safe and reliable: The equipment adopts a fully welded form, and the manufacturing process strictly follows the enterprise standards. Multiple pressure testing procedures ensure that the equipment can be used for a long time without leakage.
Energy saving and environmental protection: By using heat exchange to cool down the waste heat flue gas, the heat recycling system achieves the goal of energy saving, improves the economic efficiency of the enterprise, and reduces operating costs.
matters needing attention:
When selecting and using spray coating waste gas heat recovery plate heat exchangers, it is necessary to design and install them according to specific spray coating process parameters and requirements. It is important to ensure that the selection of the heat exchanger is appropriate, the material is heat-resistant, and appropriate control measures are taken to ensure the stability and safety of the heat exchange process.

乾燥廃熱回収

ヒートポンプ乾燥熱回収システムは、食品、医薬品、タバコ、木材、スラッジなどの乾燥に適用でき、乾燥品質が良好で自動化度が高いという特徴があり、現代の乾燥業界における省エネ、グリーン、環境保護に最適な製品です。

このユニットは、逆カルノー原理と効率的な熱回収技術を採用しています。乾燥および除湿プロセス全体を通じて、乾燥室の湿った空気は戻り空気ダクトを介して本体に接続されます。湿った空気の顕熱と潜熱は、熱回収と再利用のための顕熱プレート熱回収装置を使用して回収され、本体の性能、乾燥速度、材料品質が大幅に向上します。

排ガスからの廃熱回収量の計算方法

排ガスからの廃熱回収の可能性を計算するには、主に 2 つのアプローチがあります。

1. 熱力学的アプローチ:

This method uses the principles of thermodynamics to determine the theoretical maximum amount of heat that can be recovered. Here's what you need to consider:

  • 質量流量 (ṁ) of the exhaust gas (kg/s) - This can be obtained from engine specifications or measured with a flow meter.
  • 比熱容量(Cp) of the exhaust gas (kJ/kg⋅K) - This value varies with temperature and needs to be obtained from tables or thermodynamic software for the specific gas composition of your exhaust.
  • 入口温度 (T_in) of the exhaust gas (°C) - Measured with a temperature sensor.
  • 出口温度 (T_out) of the exhaust gas after heat recovery (°C) - This is the desired temperature after heat is removed for your chosen application (e.g., preheating combustion air, generating hot water).

熱回収ポテンシャル (Q) 次の式を使用して計算できます。

Q = ṁ * Cp * (T_in - T_out)

2. 簡略化されたアプローチ:

この方法は、大まかな見積もりを提供し、初期評価に使用しやすい方法です。排気ガスエネルギーの特定の割合を回収できることを前提としています。この割合は、エンジンの種類、動作条件、および選択した熱交換器の効率によって異なります。

推定熱回収量(Q) は次のように計算できます。

Q = 排気ガスのエネルギー量 * 回収率

排気ガスエネルギー含有量 は次のように推定できます。

排気ガスのエネルギー量 = 質量流量 * 燃料の低位発熱量 (LHV)

低位発熱量(LHV) 燃焼中に発生した水蒸気が凝縮する際に放出される熱量です (燃料仕様から入手可能)。

回復係数 パーセンテージは、エンジンの種類、動作条件、選択した熱交換器効率に応じて、通常 20% から 50% の範囲になります。

重要な注意事項:

  • これらの計算により、理論値または推定値が得られます。実際の熱回収率は、熱交換器の非効率や配管損失などの要因により、さらに低くなる可能性があります。
  • 熱力学的アプローチで選択される出口温度 (T_out) は、熱交換器の用途と制限に基づいて現実的である必要があります。
  • 高温の排気ガスを扱う際には、安全性を考慮することが非常に重要です。廃熱回収システムの設計と実装については、必ず資格のあるエンジニアに相談してください。

考慮すべき追加の要素:

  • 結露: 排気ガスの温度が露点を下回ると、水蒸気が凝縮します。これによりさらに潜熱が放出される可能性がありますが、適切な凝縮水管理が必要です。
  • 汚れ: 排気ガスには、熱交換器の表面を汚し、効率を低下させる汚染物質が含まれている場合があります。定期的な清掃や適切な材料の選択が必要になる場合があります。

これらの方法と要因を理解することで、排ガスからの廃熱回収の可能性を計算し、特定の用途での実現可能性を評価できます。

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