An external clamp type pneumatic sonic sootblowing device

Abstract

The present invention relates to an external clamping pneumatic sonic sootblowing device, comprising: a sound source body and a hoop fixing; the hoop fixing is located on the sound source body, and the sound source body is attached to the pipe surface through the hoop fixing; the sound source body is a cavity, and a compressed air inlet is provided on one side of the sound source body, and a compressed air flow channel, a resonance cavity and an exhaust port are provided inside the sound source body; the compressed air inlet is connected to one end of the compressed air flow channel, and the other end of the compressed air flow channel is connected to the resonance cavity through an arc nozzle, and the exhaust port is located between the arc nozzle and the resonance cavity. The beneficial effects of the present invention are: the external clamping pneumatic sonic sootblowing device adopted by the present invention has no moving parts, a long service life and good effect; the present invention can be directly installed on the outer surface of the heat exchange tube by external clamping, occupies a small volume, is easy to install and maintain, and can be applied to the dead angle area and the surface dust accumulation of the tube bundle group that cannot be cleaned by traditional sootblower.

Description

Technical Field

[0001] The invention relates to the field of sonic wave soot blowing, and in particular to an external clamping type pneumatic sonic wave soot blowing device. Background Art

[0002] With the rapid development of new energy around the world, the installed capacity and power generation scale of new energy represented by wind power and photovoltaic power are getting larger and larger; their randomness, volatility, intermittency and other characteristics force large-scale coal-fired steam turbine units to carry out corresponding deep peak regulation, and low-load operation of coal-fired power units is inevitable.

[0003] In recent years, my country's thermal power units have gradually developed towards large capacity, requiring units to participate in 50% rated load peak load operation. For thermal power units, low load conditions bring many safety and economic problems to the operation of the units. The main reason is that the flue gas velocity slows down when the boiler runs at low load for a long time, and dust easily accumulates on the surface of the heat exchange tube, which easily leads to overheating of the partition screen superheater, the rear screen superheater and the high temperature superheater, which can seriously lead to tube bursting.

[0004] When the boiler is running at low load, on the one hand, the smoke velocity at the furnace outlet is low, so ash is easily accumulated on the heating surface. In addition, there is a certain deviation in the smoke temperature. On the other hand, the heat radiation and smoke temperature in the horizontal flue of the furnace outlet received by each tube panel or tube are different, which causes the tube panel and the tube to absorb different amounts of heat, resulting in over-temperature creep of the tube wall. Timely cleaning of the ash accumulation on the tube wall can effectively avoid this problem. However, the traditional soot blower is not effective in cleaning the ash accumulation on the tube bundle. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide an externally clamped pneumatic sonic sootblower.

[0006] This external clamp-type pneumatic sonic sootblowing device comprises: a sound source body and a hoop fixing part; the hoop fixing part is located on the sound source body, and the sound source body is attached to the pipeline surface through the hoop fixing part; the sound source body is a cavity, and a compressed air inlet is provided on one side of the sound source body, and a compressed air flow channel, a resonance cavity and an exhaust port are provided in the sound source body; the compressed air inlet is connected to one end of the compressed air flow channel, and the other end of the compressed air flow channel is connected to the resonance cavity through an arc nozzle (the arc nozzle and the compressed air flow channel are interconnected, and the arc nozzle is the outlet of the compressed air flow channel), and the exhaust port is located between the arc nozzle and the resonance cavity; the edge parts of the conical guide bevel blank and the outer shell of the compressed air flow channel are welded together, and an arc gap of a certain angle is formed between the conical guide bevel blank and the compressed air flow channel, and the arc gap constitutes an arc nozzle; the hoop fixing part, the outer shell of the resonance cavity and the outer shell of the compressed air flow channel are connected by screws.

[0007] Preferably, a hoop fixing piece is provided at the front and rear of the sound source body, and the hoop fixing piece is used to fix the sound source body to the surface of the pipe.

[0008] Preferably, if the pipe to which the sound source body is fitted is a round tube, the inner side of the sound source body is a circular arc surface, which fits seamlessly with the round tube; each hoop fixing part is composed of two semi-circular arcs as a whole, and both ends of the bottom of the semi-circular arc are provided with circular holes extending downward, and the two circular holes are fixed by fastening screws, and the two semi-circular arc tops on one hoop fixing part are respectively connected to the outer shell of the resonance cavity, and the two semi-circular arc tops on the other hoop fixing part are respectively connected to the outer shell of the compressed air flow channel.

[0009] Preferably, the exhaust port is a groove portion between the arc-shaped nozzle and the resonance cavity, which is used to discharge the compressed air after work.

[0010] Preferably, the resonance cavity is a hollow cavity, which is the place where the compressed air flows out and impact resonance occurs to generate sound waves, and the internal depth of the resonance cavity is 10 to 20 cm.

[0011] Preferably, the inlet pressure at the compressed air inlet is 0.3-0.7 MPa.

[0012] Preferably, the width of the arc-shaped nozzle is 1 to 2 mm.

[0013] The working method of this external clamp-on pneumatic sonic soot blowing device is as follows: compressed air enters the compressed air flow channel from the compressed air inlet, the compressed air in the compressed air flow channel is ejected through the arc-shaped nozzle, forming a compressed air jet to impact the resonance cavity, the compressed air in the resonance cavity impacts and resonates to generate sound waves, and the sound waves remove the dust accumulated on the surface of the pipeline; the pressure in the resonance cavity increases, and reversely impacts the arc-shaped nozzle, and the compressed air is discharged through the exhaust port.

[0014] Preferably, the frequency of the sound waves generated inside the resonance cavity is between 400 and 800 Hz, and the sound pressure level is above 150 dB.

[0015] The beneficial effects of the present invention are as follows: the pneumatic sonic sootblowing device of the external clamp type adopted by the present invention has no moving parts, a long service life and good effect; the present invention can be directly installed on the outer surface of the heat exchange tube by external clamping, occupies a small volume, is easy to install and maintain, and can be used for dead corners and surface dust accumulation of tube bundles that cannot be cleaned by traditional sootblower. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an external clamp-on pneumatic sonic sootblowing device;

[0017] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of AA;

[0018] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of BB.

[0019] Explanation of the reference numerals: pipeline 1, resonance cavity 2, arc nozzle 3, compressed air flow channel 4, conical guide ramp 5, compressed air inlet 6, hoop fixing part 7. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0021] In order to effectively remove dust on the surface of the tube bundle, the present invention proposes an external clamp-type pneumatic sonic soot blowing device, which is installed on the outer surface of the heat exchange tube through a hoop fixing member, and can effectively clean the surface of the nearby tube bundle group to avoid overheating of the heat exchange tube surface.

[0022] As an example, Figure 1 , Figure 2 and Figure 3 The external clamp-type pneumatic sonic sootblowing device shown comprises a sound source body and a hoop fixing 7, wherein the sound source body is a cavity, which is composed of a compressed air inlet 6, a compressed air flow channel 4, a conical guide ramp 5, a resonance cavity 2, an arc nozzle 3, and an exhaust port. When the sound source body and the hoop fixing 7 are applied to a round tube 1, the inner side of the shell of the sound source body is an arc surface, which can be attached to the surface of the round tube 1 through the hoop fixing 7 and the fastening screws 8.

[0023] The hoop fixing member 7 is connected to the outer shell of the resonance cavity 2 of the sound source body and the outer shell of the compressed air flow channel 4 by screws and is attached to the surface of the round tube 1.

[0024] The sound source body includes an air intake part, a resonance cavity part and an exhaust groove (exhaust port 9). The air intake part includes a compressed air inlet 6, a compressed air flow channel 4, a conical guide bevel blank 5 and an arc nozzle 3. The outer shells of the conical guide bevel blank 5 and the compressed air flow channel 4 are welded and connected at the edge, and an arc-shaped gap with an angle of 200° between the two constitutes the arc nozzle 3. The width of the arc nozzle 3 is 1mm, and the arc nozzle 3 is the outlet of the compressed air flow channel 4. The resonance cavity part is a cavity composed of the sound source body resonance cavity 2 and the pipe 1, excluding the exhaust groove, and the length of the resonance cavity part is 20cm.

[0025] The compressed air flows into the compressed air flow channel 4 and is ejected through the arc nozzle 3, forming a compressed air jet that impacts the resonance chamber 2. Then the pressure in the resonance chamber 2 increases and impacts the arc nozzle 3 in the opposite direction, and is discharged through the exhaust port 9, completing a cycle. Since the air flow speed is very fast, this process can be formed hundreds of times per second, thus forming a high-intensity sound wave with a frequency of 400Hz and a sound pressure level of more than 150dB. The external clamp-on pneumatic sonic sootblower has no moving parts and only requires a compressed air supply. It can work in high-dust areas with flue gas temperatures below 600℃.

[0026] When the boiler is running at low load, the flue gas flow rate is low and the heated surface is seriously dusted. Traditional ultrasonic soot blowing cannot remove a large amount of dust accumulated inside the tube bundle group. The invention is directly installed on the heat exchange tube bundle to generate high-intensity sound waves to act on the surface of the heated tube bundle group, causing the dust to fatigue and fall off, thereby achieving the purpose of removing dust accumulated on the surface of the tube bundle group and dead corners, and avoiding boiler coking.

Claims

1. A working method of an external clamp-on pneumatic sonic sootblower, characterized in that: The pneumatic sonic wave sootblowing device comprises: a sound source body and a hoop fixing member (7); the hoop fixing member (7) is located on the sound source body, and the sound source body is attached to the surface of a pipeline (1) through the hoop fixing member (7); the sound source body is a cavity, and a compressed air inlet (6) is provided on one side of the sound source body, and a compressed air flow channel (4), a resonance cavity (2) and an exhaust port (9) are provided in the sound source body; the compressed air inlet (6) is connected to one end of the compressed air flow channel (4), and the other end of the compressed air flow channel (4) is connected to the compressed air inlet (6) through the resonant cavity (2) and the exhaust port (9) The arc-shaped nozzle (3) is connected to the resonance cavity (2), and the exhaust port (9) is located between the arc-shaped nozzle (3) and the resonance cavity (2); the edge portions of the outer shell of the conical flow guide oblique blank (5) and the compressed air flow channel (4) are welded together, and an arc-shaped gap with a certain angle is formed between the conical flow guide oblique blank (5) and the compressed air flow channel (4), and the arc-shaped gap constitutes the arc-shaped nozzle (3); the hoop fixing member (7), the outer shell of the resonance cavity (2) and the outer shell of the compressed air flow channel (4) are connected by screws; The working method of the pneumatic sonic soot blowing device is as follows: compressed air enters the compressed air flow channel (4) from the compressed air inlet (6), the compressed air in the compressed air flow channel (4) is ejected through the arc-shaped nozzle (3), forming a compressed air jet to impact the resonance cavity (2), the compressed air in the resonance cavity (2) impacts and resonates to generate sound waves, and the sound waves remove the dust accumulated on the surface of the pipeline (1); the pressure in the resonance cavity (2) increases, and the arc-shaped nozzle (3) is impacted in the reverse direction, and the compressed air is discharged through the exhaust port (9); the frequency of the sound waves generated inside the resonance cavity (2) is between 400 and 800 Hz, and the sound pressure level is above 150 dB.

2. The working method of the external clamp-on pneumatic sonic sootblower according to claim 1 is characterized in that: A hoop fixing piece (7) is respectively provided at the front and rear of the sound source body.

3. The working method of the external clamp-on pneumatic sonic sootblower according to claim 2 is characterized in that: If the pipe (1) to which the sound source body is fitted is a round pipe, the inner side of the sound source body is a circular arc surface, which is seamlessly fitted with the round pipe; each hoop fixing member (7) is in the form of two semicircular arcs as a whole, and circular holes extending downward are provided at both ends of the bottom of the semicircular arc, and the two circular holes are fixed by fastening screws (8), and the two semicircular arc tops on one hoop fixing member (7) are respectively connected to the outer shell of the resonance cavity (2), and the two semicircular arc tops on the other hoop fixing member (7) are respectively connected to the outer shell of the compressed air flow channel (4).

4. The working method of the external clamp-on pneumatic sonic sootblower according to claim 1 is characterized in that: The exhaust port (9) is a groove portion between the arc-shaped nozzle (3) and the resonance cavity (2).

5. The working method of the external clamp-on pneumatic sonic sootblower according to claim 1 is characterized by: The resonance cavity (2) is a hollow cavity, and the internal depth of the resonance cavity (2) is 10 to 20 cm.

6. The working method of the external clamp-on pneumatic sonic sootblower according to claim 1 is characterized by: The inlet pressure at the compressed air inlet (6) is 0.3-0.7 MPa.

7. The working method of the external clamp-on pneumatic sonic sootblower according to claim 1 is characterized by: The width of the arc-shaped nozzle (3) is 1 to 2 mm.

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