Heat Exchanger for Flue Gas Waste Heat Recovery

Flue Gas Waste Heat Recovery Heat Exchanger

In the industrial field, the exhaust temperature of boilers is commonly around 125 to 150°C, and lignite boilers around 170°C. High exhaust temperature is a common phenomenon, which results in huge economic losses.

Some power plants have gradually recognised the waste of energy due to the high exhaust temperature, and started to use flue gas waste heat exchanger to reduce the temperature of the flue gas by another 40 to 50 ℃, and has achieved initial results. Its advantages are mainly two aspects:

1. Flue gas waste heat exchanger can be absorbed from the flue gas waste heat used to heat the condensate, improve the efficiency of the unit;

2. The reduced temperature of the exhaust flue gas can make the flue gas reach a very good state of desulphurisation efficiency when entering the desulphurisation tower, which greatly reduces the cooling water consumption in the desulphurisation tower.

The role of flue gas waste heat exchanger is obvious, but its working environment is relatively harsh. This is because the operating temperature of the flue gas waste heat exchanger is close to the acid dew point or already below the acid dew point, which is easy to cause corrosion.

Vrcoolertech CST offers flue gas waste heat exchangers that are suitable for the above situation. Its main features are:

1. The heat exchanger adopts H-type finned tube with high heat exchange efficiency and compact structure;

2. Adopting new high-frequency welding technology with high automation degree, uniform and full weld seam and low thermal resistance;

3. According to different flue gas and flue characteristics, dynamic simulation of the temperature field, analysis of the high corrosion zone, and the structure, arrangement and materials of the high corrosion zone for special treatment to improve the overall life of the heat exchanger;

4. The heating surface adopts high-quality ND steel, combined with anti-corrosion optimisation measures, which can make the use of the heating surface really reach more than 15 years;

5. The shell adopts splicing structure, which is convenient for users to maintain and replace the heating surface.