Efficient air pre-heater soot blower

Abstract

The utility model discloses an efficient soot blower for an air pre-heater. The soot blowing time of the traditional flushing part is generally less than 1.5 seconds; finally, the jet velocity of a nozzle of the soot blower is low, a traditional soot blower is generally a Laval cone nozzle, steam jet is a cone, the expanding angle is large, the steam velocity is low, and the soot blowing effect is poor. The soot blower comprises an air pre-heater, a hot-end soot blower and a cold-end soot blower, the hot-end soot blower and the cold-end soot blower are arranged close to the air supply side, the cold-end soot blower comprises a soot blowing pipe, a plurality of finned pipes are arranged on the two sides of the front end of the soot blowing pipe respectively, each finned pipe is provided with a side nozzle, and the side nozzles are arranged on the two sides of the front end of the soot blowing pipe respectively. And a plurality of middle nozzles are arranged at the front end of the soot blowing pipe. The soot blower is used for soot blowing of the air pre-heater.

Description

Technical Field

[0001] This utility model relates to a high-efficiency air preheater soot blowing device. Background Technology

[0002] With increasingly stringent national and local standards for NOx emissions from coal-fired power plant boilers, ammonia escape from denitrification systems is becoming more and more serious, and air preheater blockage is a common problem.

[0003] In the actual operation of thermal power generating units, air preheaters are prone to blockage, which inevitably has a significant impact on the safety and economy of unit operation. During actual operation of the air preheater, when the flue gas pressure difference increases, the primary and secondary air pressures will show a regular increase or decrease, and the current of the primary air fan, forced draft fan, and induced draft fan will fluctuate, leading to air preheater blockage. When air preheater blockage occurs, it will significantly affect the economy and safety of boiler operation, and may also cause forced draft fan surge, exacerbate low-temperature corrosion of the air preheater, and in severe cases, cause boiler load limiting and shutdown. Therefore, preventive and remedial measures should be taken to address air preheater blockage and maintain it in good working condition, laying a solid foundation for the safe and stable operation of the denitrification unit.

[0004] Currently, the performance of sootblowers in air preheaters is poor. Firstly, the sootblower's location is inappropriate. Due to site constraints, traditional sootblowers are placed in the middle of the flue gas side, which is not the location where the heat storage plates have the highest temperature. Secondly, the sootblowing time in the flushing section is short, generally less than 1.5 seconds. Finally, the jet velocity of the sootblower nozzle is low. Traditional sootblowers are generally Laval conical nozzles, with a conical steam jet, a large expansion angle, and a low steam velocity, resulting in poor sootblowing performance. Utility Model Content

[0005] The present invention aims to solve the above-mentioned technical problems by providing a high-efficiency air preheater soot blowing device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A high-efficiency air preheater soot blowing device comprises: an air preheater, a hot-end soot blower, and a cold-end soot blower. The hot-end soot blower and the cold-end soot blower are arranged near the air supply side. The cold-end soot blower includes a soot blowing pipe. The front end of the soot blowing pipe has multiple fins on both sides. Each fin has a side nozzle. The front end of the soot blowing pipe has multiple center nozzles.

[0008] The high-efficiency air preheater soot blowing device is described above, wherein both the side nozzles and the center nozzles are elliptical nozzles.

[0009] The high-efficiency air preheater soot blowing device has three finned tubes. Beneficial effects

[0010] 1. This utility model arranges both the hot-end and cold-end soot blowers of the air preheater close to the air supply side. After the heat storage element is heated by the flue gas, when the temperature of the heat storage element is high, the soot blower can more efficiently remove the hydrogen sulfate and ammonium mixture in the heat storage element, thereby reducing the differential pressure of the air preheater.

[0011] 2. This utility model increases the total number of nozzles by setting multiple finned tubes on the soot blowing pipe and having side nozzles on the finned tubes, thereby increasing the blowing time of the heat storage elements on the outer ring of the rotor and improving the soot blowing effect.

[0012] 3. The side nozzle and center nozzle of this utility model are elliptical nozzles, which reduce the angle between the jet impact tangential and the corrugated plate and increase the steam injection speed. Attached Figure Description

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

[0014] Figure 2 This is a top view showing the arrangement of the soot blowers;

[0015] Figure 3 This is a schematic diagram of the cold-end soot blower;

[0016] In the diagram: 1. Air preheater; 2. Hot-end soot blower; 3. Cold-end soot blower; 31. Soot blowing pipe; 32. Finned tube; 33. Side nozzle; 34. Middle nozzle. Detailed Implementation

[0017] Reference Figures 1-3 A high-efficiency air preheater soot blowing device, comprising: an air preheater 1, a hot-end soot blower 2, and a cold-end soot blower 3;

[0018] The heat storage elements of the air preheater rotate continuously 360° with the rotor. Each air preheater is equipped with two soot blowers, one above and one below the heat storage elements; these are the cold-end soot blower and the hot-end soot blower. The hot-end soot blower blows downwards from above the heat storage elements, while the cold-end soot blower blows upwards from below. Both soot blowers are fixedly installed. Depending on the distribution of blockages, the lower-level cold-end soot blower is primarily used to clear blockages from the air preheater.

[0019] The hot-end sootblower and the cold-end sootblower are arranged near the air supply side. By arranging both the hot-end and cold-end sootblowers of the air preheater close to the air supply side, the sootblower can more efficiently remove the ammonium bisulfate mixture from the heat storage element when the temperature of the heat storage element is high after being heated by the flue gas, thereby reducing the differential pressure of the air preheater. The cold-end sootblower includes a sootblowing pipe 31, and multiple fins 32 on both sides of the front end of the sootblowing pipe. There are three fins, and each fin has a side nozzle 33. The front end of the sootblowing pipe has multiple center nozzles 34. By setting multiple fins on the sootblowing pipe and having side nozzles on the fins, the total number of nozzles is increased, the purging time of the heat storage element on the outer ring of the rotor is increased, and the sootblowing effect is improved.

[0020] Both the side nozzles and the center nozzles are elliptical nozzles, which reduces the angle between the jet impact tangential and the corrugated plate and increases the steam injection rate.

Claims

1. A high-efficiency air preheater soot blowing device, comprising: An air preheater, a hot-end soot blower, and a cold-end soot blower are characterized in that: the hot-end soot blower and the cold-end soot blower are arranged near the air supply side, the cold-end soot blower includes a soot blowing pipe, the front end of the soot blowing pipe has multiple fins on both sides, each fin has a side nozzle, and the front end of the soot blowing pipe has multiple center nozzles.

2. The high-efficiency air preheater soot blowing device according to claim 1, characterized in that: Both the side nozzle and the center nozzle are elliptical nozzles.

3. The high-efficiency air preheater soot blowing device according to claim 2, characterized in that: The finned tubes are three in number.

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