Boiler flue gas condensate water collecting and discharging device

Abstract

The utility model relates to a kind of boiler flue gas condensate water collection and discharge device, multiple layers of heat exchange pipes are equipped in flue along flue gas flow direction, each layer of heat exchange pipe is equipped with multiple heat exchange pipes, the lower of each layer of heat exchange pipe is equipped with a layer of V-shaped groove, the heat exchange pipe and V-shaped groove one-to-one correspondence, V-shaped groove is set in the directly below of corresponding heat exchange pipe, both sides of each layer of V-shaped groove are equipped with U-shaped groove, the end of multiple V-shaped grooves of same layer and the U-shaped groove of corresponding side are communicated, the tail of U-shaped groove is equipped with hydrophobic tube, the hydrophobic tube extends to the outside of flue by passing through the side plate of flue.The utility model is simple in structure, high in collection efficiency, does not affect flue gas flow and is suitable for multiple layers of array heat exchange pipe structure.

Description

Technical Field

[0001] This utility model relates to the field of boiler equipment technology, specifically to a boiler flue gas condensate collection and discharge device. Background Technology

[0002] With the increasing global demand for energy and growing environmental awareness, energy policies and structures are constantly evolving. Oil and gas fuels, as high-quality, efficient, and environmentally friendly clean energy sources, still have broad application prospects. Condensing boilers using oil and gas as fuel, especially natural gas-fired condensing boilers, are favored by users across various industries due to their advantages such as low flue gas temperature, high thermal efficiency, and low environmental pollution.

[0003] When oil-fired or gas-fired condensing boilers are in operation, especially during cold start-up or low-load operation, the flue gas temperature is very low, and a large amount of condensate often forms on the boiler's tail-end heating surfaces. The flue gas from oil and gas combustion contains water vapor, which condenses on the tail-end heating surfaces when the flue gas temperature is lower than the dew point temperature. This condensate wets and cools the heating surfaces, forming a smooth liquid film that covers them. Under the influence of gravity and flue gas pressure, the condensate flows down the heating surfaces. The water vapor that subsequently flows through can only condense on the surface of this liquid film, transferring heat first to the film and then to the water inside the tubes. This significantly affects heat exchange efficiency. In existing heat exchanger structures, condensate typically drips down under gravity and flue gas pressure. Condensate on the upper heat exchange tubes gradually drips onto the lower heat exchange tubes, causing the lower tubes to be constantly immersed in condensate, further reducing their heat exchange efficiency.

[0004] More seriously, during the flue gas condensation process, acidic substances such as sulfur oxides and hydroxides in the flue gas dissolve in the condensate. When the acid concentration in the condensate increases to a certain level, it can accelerate the corrosion rate of the heated surface, causing acid corrosion. This not only seriously affects the safe and stable operation of the heat exchanger, but also greatly shortens the service life of the equipment. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a boiler flue gas condensate collection and discharge device that is simple in structure, has high collection efficiency, does not affect flue gas flow, and is suitable for multi-layer heat exchanger tube arrays.

[0006] The purpose of this utility model is achieved as follows: A boiler flue gas condensate collection and discharge device includes multiple layers of heat exchange tubes arranged along the flue gas flow direction inside the flue. Each layer of heat exchange tubes has multiple heat exchange tubes, and a V-shaped groove is provided below each layer of heat exchange tubes. The heat exchange tubes and V-shaped grooves correspond one-to-one, and the V-shaped grooves are located directly below the corresponding heat exchange tubes. U-shaped grooves are provided on both sides of each layer of V-shaped grooves. The ends of multiple V-shaped grooves in the same layer are connected to the corresponding U-shaped grooves on the side. A drain pipe is provided at the tail of each U-shaped groove, and the drain pipe extends through the side plate of the flue to the outside of the flue.

[0007] Preferably, the opening width of the V-groove is not less than the outer diameter of the corresponding heat exchange tube.

[0008] Preferably, the multiple drainage pipes on the same side pass through the side plate on the corresponding side of the flue and are connected together to a drainage manifold.

[0009] Preferably, the U-shaped groove has an inclined slope of 1-5°, and the drainage pipe is located at the lowest point of the U-shaped groove.

[0010] The beneficial effects of this utility model are: High-efficiency collection improves heat exchange efficiency: By setting a V-shaped groove directly under each heat exchange tube, "point-to-point" precise collection of condensate is achieved, which effectively prevents condensate from dripping and splashing onto the lower heat exchange tubes. This eliminates the problem of liquid film soaking on the surface of the lower heat exchange tubes, allowing all heat exchange tubes to maintain efficient contact between the exposed metal surface and the flue gas, thereby significantly improving the overall heat exchange efficiency. Effective corrosion prevention and extended service life: By quickly draining acidic condensate from the heat exchange area, the contact time between condensate and the heat exchange tubes and other flue inner walls is greatly reduced, thereby effectively inhibiting the occurrence of acid corrosion and extending the service life of the boiler tail heating surface and the entire heat exchange system. Simple structure and strong applicability: This device does not require complex guide plates or other additional components. It has a simple structure and low manufacturing and installation costs. The modular design with one V-groove per tube and two U-grooves per layer is very suitable for multi-layer, array-type heat exchange tubes and has strong versatility. Optimized flow field for minimal resistance: The gap design between the heat exchange tubes and the V-groove ensures smooth flue gas flow, avoids additional flue gas resistance due to the collection device, and ensures the stability of boiler operation. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a boiler flue gas condensate collection and discharge device according to the present invention.

[0012] Figure 2 for Figure 1 A sectional view.

[0013] The components include: heat exchange tube 1; flue 2; V-shaped groove 3; U-shaped groove 4; drain pipe 5; and drainage collection pipe 6. Detailed Implementation

[0014] See Figure 1 and Figure 2 This utility model relates to a boiler flue gas condensate collection and discharge device, including heat exchange tubes 1, flue 2, V-shaped grooves 3, U-shaped grooves 4, drain pipes 5, and drainage collection pipes 6. Multiple layers of heat exchange tubes 1 are arranged in the flue 2 along the flue gas flow direction. Each layer of heat exchange tubes 1 has multiple heat exchange tubes 1. Below each layer of heat exchange tubes 1 is a layer of V-shaped grooves 3. The heat exchange tubes 1 and V-shaped grooves 3 correspond one-to-one. The V-shaped grooves 3 are located directly below the corresponding heat exchange tubes 1 and are parallel to the heat exchange tubes 1. U-shaped grooves 4 are provided on both sides of each layer of V-shaped grooves 3. The ends of multiple V-shaped grooves in the same layer are connected to the corresponding U-shaped grooves 4, allowing the liquid in the V-shaped grooves 3 to flow smoothly into the U-shaped grooves 4. The opening width of the V-shaped grooves 3 is not less than the outer diameter of the corresponding heat exchange tubes 1 to ensure that the condensate dripping can be completely collected.

[0015] Each V-shaped groove 3 has a long U-shaped groove 4 installed on each side along its length. The U-shaped groove 4 is fixed to the flue. The tail of the U-shaped groove 4 is provided with a drain pipe 5, which extends through the side plate of the flue 2 to the outside of the flue 2.

[0016] The multi-layered drainage pipes 5 on the same side pass through the side plate on the corresponding side of the flue 2 and are connected together to a drainage collection pipe 6.

[0017] The heat exchange tube 1 and the V-shaped groove 3 directly below it maintain an appropriate gap. This design ensures that the flue gas can smoothly scour the surface of the heat exchange tube, avoids the formation of dead angles in flue gas flow due to structural obstruction, minimizes flue gas resistance, and eliminates the need for additional guide plates, thus simplifying the structure.

[0018] The U-shaped groove 4 is installed with a certain inclination slope, preferably 1-5°. The drain pipe 5 is located at the lowest point of the U-shaped groove 4, which ensures that the condensate flowing into the U-shaped groove 4 flows quickly to the drain pipe 5 under the action of gravity, avoiding accumulation in the groove.

[0019] Working principle: The hot flue gas from the combustion of oil and gas fuels washes over the cold heat exchange tube 1. When the temperature drops to the flue gas dew point temperature, the water vapor in the flue gas condenses into condensate on the surface of the heat exchange tube 1. The condensate drips into the V-shaped groove 3, and the condensate in the V-shaped groove 3 flows into the U-shaped groove 4. Due to the slope of the U-shaped groove 4, the condensate will quickly flow through the drain pipe 5 to the drain collection pipe 6, and then the drain collection pipe 6 will guide the condensate to a safe location.

[0020] In addition to the above embodiments, this utility model also includes other implementation methods. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of this utility model.

Claims

1. A boiler flue gas condensate collection and discharge device, wherein multiple layers of heat exchange tubes are arranged in the flue along the flue gas flow direction, and each layer of heat exchange tubes is provided with multiple heat exchange tubes, characterized in that: Below each layer of heat exchange tubes is a layer of V-shaped grooves, with each heat exchange tube corresponding to a V-shaped groove. The V-shaped grooves are located directly below the corresponding heat exchange tubes. Each layer of V-shaped grooves has U-shaped grooves on both sides. The ends of multiple V-shaped grooves in the same layer are connected to the corresponding U-shaped grooves on the side. The tail of each U-shaped groove is provided with a drain pipe, which extends through the side plate of the flue to the outside of the flue.

2. The boiler flue gas condensate collection and discharge device according to claim 1, characterized in that: The opening width of the V-groove is not less than the outer diameter of the corresponding heat exchange tube.

3. The boiler flue gas condensate collection and discharge device according to claim 1, characterized in that: The multi-layered drainage pipes on the same side pass through the side plate on the corresponding side of the flue and are connected to a common drainage pipe.

4. The boiler flue gas condensate collection and discharge device according to claim 1, characterized in that: The U-shaped channel has an inclined slope of 1-5°, and the drainage pipe is located at the lowest point of the U-shaped channel.

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