中文学术论文要求查重率小余106000字左右关于管式加热炉烟气回收系统的核心设备板管式空气预热器露点腐蚀蚀

Abstract

管式加热炉烟气回收系统中的核心设备之一是板管式空气预热器。该预热器能够有效地提高热效率，减少燃料消耗和环境污染，并且广泛应用于各种工业领域。然而，由于工作条件的限制，板管式空气预热器可能存在露点腐蚀和蚀穿等问题，严重影响设备的寿命和运行效率。本文通过对板管式空气预热器的结构、工作原理以及露点腐蚀等问题进行研究和分析，提出了一些解决方案，旨在为管式加热炉烟气回收系统的设计和运行提供参考。

Keywords: 管式加热炉；烟气回收系统；板管式空气预热器；露点腐蚀

Introduction

管式加热炉是一种广泛应用于工业领域的加热设备，其工作原理是通过燃烧燃料（如天然气、燃油等）来加热管道内的流体（如水、油等），以实现加热和保温的效果。然而，在燃烧过程中，会产生大量的烟气和废气，对环境造成污染。为了解决这一问题，人们研发出了管式加热炉烟气回收系统，通过回收和利用烟气中的热能，提高热效率，减少燃料消耗和环境污染。

板管式空气预热器是管式加热炉烟气回收系统中的核心设备之一，其主要作用是将回收的烟气中的热能传递给空气，使空气在进入加热炉之前预先加热，从而提高热效率。然而，由于工作条件的限制，板管式空气预热器可能存在露点腐蚀和蚀穿等问题，这些问题可能会严重影响设备的寿命和运行效率。因此，对板管式空气预热器的结构、工作原理以及露点腐蚀等问题进行研究和分析，对于管式加热炉烟气回收系统的设计和运行具有重要意义。

Structural and working principle of plate and tube air preheater

Plate and tube air preheater is mainly composed of heat exchange tube, casing, air inlet and outlet, smoke inlet and outlet, ash cleaning device and so on. The heat exchange tube is arranged in the casing in the form of a plate, and the smoke flows through the heat exchange tube from the smoke inlet to the smoke outlet. The air flows through the gap between the plates from the air inlet to the air outlet, and heat is exchanged between the smoke and the air through the heat exchange tube.

The working principle of plate and tube air preheater is to use the heat energy of the recovered smoke to preheat the air before entering the heating furnace, so as to reduce the heat loss of the heating furnace and improve the thermal efficiency of the system. The recovered smoke enters the heat exchange tube from the smoke inlet, and the heat exchange tube transfers heat to the air through the plate. After the heat exchange, the smoke is discharged from the smoke outlet, and the preheated air enters the heating furnace from the air outlet.

Corrosion problem of plate and tube air preheater

The corrosion problem of plate and tube air preheater is mainly caused by the condensation of water vapor in the recovered smoke. When the temperature of the recovered smoke is lower than the dew point temperature of the water vapor, water will condense on the surface of the heat exchange tube, forming a thin film of water. The water film will corrode the heat exchange tube and cause the plate and tube air preheater to fail.

The dew point temperature of water vapor in the recovered smoke is affected by many factors, such as the composition and content of the flue gas, the temperature of the recovered smoke, the humidity of the air, and the flow rate of the air. The higher the content of water vapor in the flue gas and the lower the temperature of the recovered smoke, the higher the dew point temperature of water vapor. The higher the humidity of the air and the lower the flow rate of the air, the more likely water vapor is to condense on the surface of the heat exchange tube.

Solutions to corrosion problem of plate and tube air preheater

There are several solutions to the corrosion problem of plate and tube air preheater:

1. Increase the temperature of the recovered smoke. By increasing the temperature of the recovered smoke, the dew point temperature of water vapor can be increased, which can reduce the condensation of water vapor on the surface of the heat exchange tube.

2. Increase the flow rate of the air. By increasing the flow rate of the air, the residence time of the air in the plate and tube air preheater can be reduced, which can reduce the condensation of water vapor on the surface of the heat exchange tube.

3. Use anti-corrosion materials for heat exchange tubes. By using anti-corrosion materials for heat exchange tubes, the corrosion resistance of plate and tube air preheater can be improved, which can prolong the service life of the equipment.

4. Regular maintenance and cleaning of the plate and tube air preheater. Regular maintenance and cleaning of the plate and tube air preheater can remove the deposited water film and impurities on the surface of the heat exchange tube, which can reduce the corrosion and improve the heat exchange efficiency of the equipment.

Conclusion

Plate and tube air preheater is a core equipment in the smoke recovery system of tube furnace, which plays an important role in improving the thermal efficiency, reducing fuel consumption and environmental pollution. However, due to the limitations of working conditions, plate and tube air preheater may have problems such as dew point corrosion and perforation, which seriously affects the service life and operating efficiency of the equipment. Therefore, it is necessary to study and analyze the structure, working principle and dew point corrosion problem of plate and tube air preheater, and put forward some solutions, which can provide reference for the design and operation of tube furnace smoke recovery system.