Intelligent glass tube air preheater

Abstract

An intelligent glass tube air preheater comprises an air preheater body which is provided with a hot flue gas inlet, a hot air outlet, a cold air inlet, a cold flue gas outlet, a plurality of heat exchange modules, a bridging air duct, a cold flue gas outlet header, an on-site thermometer, a glass tube, a spoiler and a stainless steel tube cap. The glass tube serves as a low-temperature section heat exchange element, spoilers are arranged in the glass tube, and the heat transfer coefficient of an inner film is increased. A guide plate is arranged in the body inner cavity on the lower portion of the hot smoke inlet, a bridging air duct guide plate is arranged in the bridging air duct inner cavity, and a plurality of on-site thermometers are longitudinally arranged on the outer side of the hot air outlet. According to the load of a heating furnace and the pressure and flow of fluid, the direction of the rotating guide plate is adjusted by rotating the handle, so that the fluid in the whole air preheater is distributed more uniformly, heat exchange is more uniform, the heat exchange efficiency of the whole air preheater is improved, the dew point corrosion risk is reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of heating furnace technology and relates to an intelligent glass tube air preheater. Background Technology

[0002] In recent years, as heating furnaces have become increasingly larger, the size of air preheaters has also continued to increase. In existing large air preheaters, airflow deviation is highly likely to occur within the internal heat exchange modules. This manifests as a faster flow velocity in the central area and a slower flow velocity around the edges, creating airflow "dead zones." Within these dead zones, the heat exchange surfaces cannot function effectively, resulting in wasted resources. Furthermore, due to uneven heat exchange, the flue gas and air cannot fully exchange heat, leading to increased exhaust gas temperature, which also undoubtedly wastes energy. Utility Model Content

[0003] This invention aims to provide an intelligent glass tube air preheater. This device can effectively prevent airflow deviation in the internal heat exchange module, reduce the generation of airflow "dead zones," and maximize the utilization rate of the heat exchange surface. Simultaneously, using glass tubes as the heat exchange module in the low-temperature section can effectively resist acid dew point corrosion; and installing heat transfer baffles on the air side inside the glass tube can improve the heat transfer coefficient of the inner film of the glass tube in the air preheater.

[0004] The technical solution adopted in this utility model is as follows:

[0005] The intelligent glass tube air preheater includes an air preheater body, which is equipped with a hot flue gas inlet, a hot air outlet, a cold air inlet, a cold flue gas outlet, multiple heat exchange modules, a bridging duct, a cold flue gas outlet header, a field thermometer, a glass tube, baffles, and a stainless steel tube cap.

[0006] Baffle plate configuration: Baffle plates are installed in the internal cavities between heat exchange modules and in the internal cavity below the hot flue gas inlet. Each baffle plate consists of a fixed baffle plate, a rotating baffle plate, a sealed bearing, and a handle. The fixed baffle plate is fixed within its designated internal cavity; the rotating baffle plate is connected to a shaft within the cavity, with both ends of the shaft connected to the outer wall of the equipment via sealed bearings. One end of the shaft extends beyond the outer wall and is fitted with a handle, which rotates the rotating baffle plate. Furthermore, multiple baffle plates are arranged in parallel and spaced intervals below the hot flue gas inlet and between multiple heat exchange modules. Both the fixed and rotating baffle plates are serrated and have ventilation holes to enhance airflow mixing. The handle is equipped with a locking device to secure the rotating baffle plate in its rotated position. The baffle plate can adjust the uniformity of gas flow on the flue gas side plane of the air preheater body. Combined with the adjustment function of the bridging duct, it can intelligently adjust the airflow based on the temperature feedback signal from the thermometer to ensure that the exhaust gas temperature of the air preheater is reduced to the lowest level, the airflow is most uniform, and the baffle plate is in the optimal position.

[0007] Cross-connection duct design: The inner cavity of the cross-connection duct is equipped with a cross-connection duct guide plate, whose function is to regulate the uniformity of airflow within the cross-connection duct. Based on feedback signals from multiple field thermometers longitudinally positioned outside the hot air outlet, the guide plate on the cross-connection duct is intelligently adjusted to ensure that the hot air outlet temperature of the air preheater reaches its maximum value, at which point the airflow is most uniform and the guide plate is in the optimal position.

[0008] Low-temperature section heat exchange element: The glass tube serves as the heat exchange element in the low-temperature section, and is equipped with baffles inside to increase the inner film heat transfer coefficient. The baffles are made of thin steel plates wound and welded onto round steel, with threads machined at both ends of the round steel. The stainless steel cap consists of two stainless steel rings connected by three connecting plates. The inner diameter of the outer ring is larger than that of the glass tube, and the inner diameter of the inner ring is larger than that of the wound round steel. The glass tube, baffles, and stainless steel cap are connected together by nuts. After tightening the nuts, the baffles are located in the center of the glass tube and do not contact the glass tube.

[0009] Other configurations: The cold flue gas outlet header is equipped with alkaline beads to neutralize the acidic water produced by the flue gas, ensuring that the flue gas condensate meets emission standards. A wire mesh demister is installed at the cold flue gas outlet, which not only removes water droplets from the flue gas, preventing water droplets from impacting the induced draft fan blades and causing vibration damage to the induced draft fan, thus protecting the induced draft fan, but also ensures uniform mixing of hot and cold flue gas.

[0010] Staff can observe the adjustment effect of the guide vane based on the on-site thermometers and gas outlet temperature. Since each heat exchange module has multiple on-site thermometers, the angle of the guide vane is adjusted according to the thermometer readings. When the exhaust gas temperature reaches its lowest value, the guide vane is at its optimal angle. This invention allows for adjustment of the direction of the rotating guide vane by turning the handle, based on the furnace load and the fluid pressure and flow rate. This results in a more uniform fluid distribution within the entire air preheater, more thorough heat exchange, improved overall air preheater heat exchange efficiency, reduced dew point corrosion risk, and extended equipment lifespan.

[0011] Furthermore, both the fixed guide vane and the rotating guide vane are serrated.

[0012] Furthermore, ventilation holes are provided on both the fixed and rotating guide plates to enhance airflow mixing. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a perspective view of the present utility model;

[0015] Figure 3 Schematic diagram of a glass tube with built-in baffles

[0016] Figure 4 This is a schematic diagram of the structure of the guide plate of this utility model;

[0017] Figure 5 This is a schematic diagram of the handle of this utility model;

[0018] Figure 6 This is a schematic diagram of the vent hole of this utility model.

[0019] In the diagram: 1 Fixed guide plate; 2 Rotating guide plate; 3 Shaft; 4 Sealed bearing; 5 Handle; 6 Air preheater body; 7 Alkaline balls; 8 Wire mesh demister; 9 On-site thermometer; 10 Vent; 11 Glass tube; 12 Baffle plate; 13 Stainless steel pipe cap; 14 Nut. Detailed Implementation

[0020] Overall layout: refer to the example Figure 1 , Figure 2As shown, this utility model includes an air preheater body and its hot flue gas inlet, hot air outlet, cold air inlet, cold flue gas outlet, multiple heat exchange modules, bridging duct, cold flue gas outlet header, field thermometers, glass tubes, baffles, stainless steel pipe caps, and nuts. Multiple guide plates are installed inside the air preheater body 6 at the lower part of the hot flue gas inlet. Multiple guide plates are also installed inside the air preheater body 6 between the multiple heat exchange modules. Guide plates are installed inside the bridging duct. Multiple field thermometers 9 are installed longitudinally on the outer side of each heat exchange module and the hot air outlet.

[0021] Deflector Plate Installation: Referring to Figures 4 and 5, the deflector plate consists of a fixed deflector plate 1, a rotating deflector plate 2, a sealed bearing 4, and a handle 5. The fixed deflector plate 1 is fixed at both ends to the inner cavity of the equipment at its location. The rotating deflector plate 2 is connected to a rotating shaft 3 within the inner cavity at its location. Both ends of the rotating shaft 3 are connected to the outer wall of the equipment via sealed bearings 4. One end of the shaft extends out of the outer wall and is fitted with a handle 5. Rotating the handle 5 will cause the rotating deflector plate 2 to rotate.

[0022] Glass tube heat exchange module: combined with Figure 3 The low-temperature heat exchange module uses a glass tube 11 as the heat exchange element, with baffles 12 installed inside to increase the inner membrane heat transfer coefficient. The baffles are made of thin steel plates wound and welded onto round steel, with threads at both ends of the round steel. The stainless steel cap 13 consists of two stainless steel rings connected by three connecting plates; the outer ring's inner diameter is larger than that of the glass tube, and the inner ring's inner diameter is larger than that of the wound round steel. The glass tube 11, baffles 12, and stainless steel cap 13 are connected together by nuts. Tightening the nuts 14 ensures that the baffles are centered on the glass tube and do not contact it.

[0023] Other components: The fixed guide plate 1 and the rotating guide plate 2 are serrated and have ventilation holes 10 (see Figure 6) to enhance airflow mixing. The handle 5 has a locking device to fix the rotating guide plate 2 in its rotated position. The cold flue gas outlet header contains alkaline beads 7 to neutralize the acidic water produced by the flue gas, ensuring that the flue gas condensate meets emission standards. A wire mesh demister 8 is installed at the cold flue gas outlet to remove water droplets from the flue gas and protect the induced draft fan.

Claims

1. An intelligent glass tube air preheater characterized by, The air preheater body is provided with a hot flue gas inlet, a hot air outlet, a cold air inlet, a cold flue gas outlet, a plurality of heat exchange modules, a cross air duct, a cold flue gas outlet header tank, an on-site thermometer, a glass tube, a spoiler, and a stainless steel tube cap. The glass tube is used as a low-temperature section heat exchange element, and the spoiler is arranged in the glass tube to increase the inner film heat transfer coefficient. The spoiler is a thin steel plate wound and welded on a round steel, and the two ends of the round steel are threaded. The stainless steel tube cap is two stainless steel rings connected together by three connecting plates, and the inner diameter of the outer ring is larger than that of the glass tube, and the inner diameter of the inner ring is larger than that of the round steel. The inner cavity of the body at the lower part of the hot flue gas inlet is provided with a flow guide plate to adjust whether the air preheater body flue gas side plane gas flow is uniform. The inner cavity of the body between the heat exchange modules is provided with a flow guide plate, and the inner cavity of each heat exchange module is provided with a plurality of on-site thermometers. The inner cavity of the cross air duct is provided with a cross air duct flow guide plate to adjust whether the air flow in the cross air duct is uniform.

2. An intelligent glass tube air preheater as claimed in claim 1, wherein, The outer side of the hot air outlet is provided with a plurality of on-site thermometers.

3. An intelligent glass tube air preheater as claimed in claim 1, wherein The flow guide plate includes a fixed flow guide plate, a rotating flow guide plate, a sealing bearing, and a handle.

4. An intelligent glass tube air preheater as claimed in claim 1, wherein The fixed flow guide plate is fixed in the inner cavity of the position, and the rotating flow guide plate is connected to the rotating shaft in the inner cavity of the position.

5. An intelligent glass tube air preheater as claimed in claim 1, wherein The rotating shaft is connected to the outer wall of the device in the position by the sealing bearing at both ends, and one end extends out of the outer wall of the device and is provided with a handle.

6. An intelligent glass tube air preheater as claimed in claim 1, wherein The flow guide plates in the inner cavity of the air preheater body at the lower part of the hot flue gas inlet and the inner cavity of the preheater body between the plurality of heat exchange modules are arranged in parallel and spaced apart. The fixed flow guide plate and the rotating flow guide plate are sawtooth-shaped. Air holes are opened on the fixed flow guide plate and the rotating flow guide plate to enhance the mixing of air flow. The handle is provided with a detent device to fix the position of the rotating flow guide plate after rotation.

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