Lord Fin Tube-Membrane type water wall

The membrane-type water wall welds finned tubes (or flat steel and smooth tubes) together to form a complete tube panel, offering several advantages in boiler design and operation. This technology is particularly prevalent in large-capacity, high-temperature, and high-pressure boilers. Here are some key points to further elaborate on the features and benefits:

Membrane-Type Water Wall:

1. Air Tightness: The membrane water wall ensures good air tightness in the combustion chamber, preventing air leakage during the combustion process.

2. Insulation Advantage: The outer surface of the tube screen requires only a thinner insulation material, contributing to better insulation efficiency.

3. Slag Prevention: By keeping the high-temperature flue gas from directly contacting the furnace wall, the membrane water wall helps prevent slagging, enhancing the longevity of the furnace.

4. Factory Prefabrication: The tube screen can be prefabricated in the factory, streamlining the site installation process and ensuring precision.

5. Application in High-Performance Boilers: Large-capacity, high-temperature, and high-pressure boilers predominantly utilize membrane water walls due to their efficiency and reliability.

Pin-Type Water Wall:

1. Refractory Coating: Pin-type water walls, also known as barbed tube water walls, involve welding round steel on the tube surface to create a structure that can securely hold refractory coating, forming fire protection zones and slagging sections.

2. Application in Cyclone Furnaces: Pins in pin-type water walls are strategically used to enhance the refractory coating, providing effective protection against high-temperature and harsh conditions, including those found in cyclone furnaces.

Internally Threaded Tube:

1. Enhanced Heat Transfer: Internally threaded tubes, featuring single or multi-end spiral grooves on the inner wall, are deployed in high heat load areas to disturb the flow of working fluid, preventing the deterioration of boiling heat.

2. Prevention of Heat Transfer Deterioration: The disturbance caused by the internally threaded tube prevents the formation of steam film, maintaining efficient heat transfer and preventing heat transfer deterioration.

Double-Sided Exposure Water Wall:

1. Radiant Heat Absorption: Double-sided exposure water walls are positioned along the furnace height to absorb radiant heat on both sides, commonly used in large-capacity boilers.

2. Material Selection: Carbon steel is typically used as water wall material, with the possibility of employing alloy steels when the boiler pressure exceeds 14 MPa.

3. Versatility in Design: The water wall configuration can vary, including vertical, horizontal, or other forms based on boiler type and operating parameters.

Advantages of Membrane Water Wall:

1. Furnace Tightness: Ensures the tightness of the furnace wall, minimizing air leakage during combustion.

2. Full Water Cooling: Facilitates full water cooling of the combustion chamber, reducing the risk of coking during enhanced combustion.

3. Quick Heat Exchange: Small heat storage capacity leads to rapid heating and cooling of the combustion chamber, shortening boiler startup and shutdown times.

4. Reduced Frame Load: The tube-laying furnace wall reduces the load on the boiler frame, making it easier to suspend.

5. Enhanced Heat Absorption: Compared to light pipes, membrane water walls exhibit improved heat absorption capacity.

6. Prefabrication Efficiency: Improves the pre-assembly degree of boiler components, streamlining installation and reducing workload.

In summary, these advanced water wall technologies contribute significantly to the efficiency, reliability, and overall performance of boilers, offering benefits such as enhanced heat transfer, reduced air leakage, and streamlined installation processes.

Membrane type water wall|Pin type water wall