Self-oscillation jet flow steam soot blower

Abstract

The invention relates to the technical field of soot blowers, and discloses a self-oscillation jet flow steam soot blower which comprises a soot blowing steam source arranged outside a hearth. One end of the spray pipe is connected with a soot blowing steam source pipeline, and the other end extends into the hearth; the driving device can drive the spray pipe to move; a plurality of jet nozzles are mounted at one end of the spray pipe in the hearth; when the soot blowing steam source introduces steam into the spray pipe, the steam enters the jet flow nozzle through the spray pipe and finally forms periodic oscillation jet flow with a certain sweeping angle after passing through the jet flow nozzle, and the oscillation jet flow is jetted on a boiler water wall pipe of a hearth heating surface to sweep the boiler heating surface on the plane where the jet flow nozzle is located; through reasonable arrangement of the jet nozzles, the soot blower can complete soot blowing work on the heating surface of the hearth without rotating, so that the complexity and the air leakage probability of the sealing structure of the soot blower are reduced, and the maintenance cost of the sealing device is reduced through the simple sealing structure.

Description

Technical Field

[0001] The invention relates to the technical field of soot blowers, and in particular to a self-excited oscillating jet steam soot blower. Background Art

[0002] Steam sootblowing is the most commonly used sootblowing technology for power station boilers. The commonly used steam sootblower ensures the sootblowing effect by rotating the nozzle. However, because the nozzle needs to rotate, the steam sootblower has many moving parts, which on the one hand makes the sealing part easy to leak air and has a high failure rate. On the other hand, rotating sootblowing also increases the consumption of electricity to a certain extent. Summary of the invention

[0003] To solve the above problems, the present invention proposes a self-excited oscillating jet steam sootblower, which increases the working area of ​​the sootblower, enhances the sootblowing effect, and reduces the air leakage failure rate and energy consumption of the sootblower through the oscillating jet generated by the sootblower nozzle.

[0004] The technical solution adopted by the present invention is: A self-excited oscillating jet steam sootblower, comprising a sootblowing steam source disposed outside a furnace; a nozzle having one end connected to a sootblowing steam source pipeline and the other end extending to the furnace; and a driving device capable of driving the nozzle to move; The nozzle can move horizontally and extend into or out of the furnace through a driving device; a plurality of jet nozzles are installed at one end of the nozzle in the furnace; when a soot-blowing steam source introduces steam into the nozzle, the steam enters the jet nozzle through the nozzle, and finally forms a periodic oscillating jet with a certain sweeping angle after passing through the jet nozzle, and the oscillating jet is sprayed on the boiler water-cooled wall tube on the heating surface of the furnace to clean the boiler heating surface on the plane where the jet nozzle is located.

[0005] Furthermore, a nozzle steam outlet is formed at the connection point between the nozzle end and the jet nozzle; the nozzle steam outlet is a gradually contracting channel.

[0006] Furthermore, the jet nozzle includes a mixing chamber, a first reflux chamber and a second reflux chamber; the jet nozzle as a whole is a cubic chamber structure, which is divided into a mixing chamber, a first reflux chamber and a second reflux chamber by two symmetrically arranged hollow island structures, the first reflux chamber and the second reflux chamber are symmetrically arranged on both sides of the mixing chamber, and the first reflux chamber and the second reflux chamber are connected to the mixing chamber at their inlets and outlets.

[0007] Furthermore, the inlet of the mixing chamber, the inlet of the first reflux chamber, the inlet of the second reflux chamber, and the nozzle steam outlet of the nozzle are connected; the inlet of the mixing chamber is a tapered channel in the opposite direction to the nozzle steam outlet.

[0008] Furthermore, the middle section of the mixing chamber is a straight chamber section, and the middle section of the mixing chamber is connected to the outlet of the first reflux chamber and the outlet of the second reflux chamber; the outlet of the mixing chamber is a gradually expanding smooth channel that first contracts inward and then expands outward.

[0009] Furthermore, four jet nozzles are symmetrically installed at one end of the nozzle in the furnace.

[0010] Furthermore, the self-excited oscillating jet steam sootblower also includes a driving device capable of driving the nozzle to move; the nozzle can extend into or out of the furnace through the driving device.

[0011] Furthermore, a hole is provided on the outer wall of the furnace for the nozzle to extend into or exit, and an electric sealing device is installed at the hole.

[0012] The beneficial effects of the present invention are: The self-excited oscillating jet steam sootblower enables the steam jet to periodically sweep the heating surface within a certain angle range. Through the reasonable arrangement of the jet nozzle, the sootblower can complete the sootblowing work of the heating surface of the furnace without rotating, thereby reducing the complexity of the sootblower sealing structure and the probability of air leakage. The simple sealing structure also reduces the maintenance cost of the sealing device.

[0013] In addition, the oscillating jet generated by the self-excited oscillating jet steam sootblower has a more turbulent flow field near the heated surface, which makes the steam injected by the sootblower have a stronger cleaning ability, which can reduce the steam usage for sootblowing to a certain extent. At the same time, the sootblower that does not need to rotate also eliminates the power consumption of the rotating motor, which is more energy-efficient than conventional steam sootblower. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them: Figure 1 It is a schematic diagram of the overall structure of the self-excited oscillating jet steam sootblower of the present invention; Figure 2 For the present invention Figure 1 Sectional view at AA in the middle; Figure 3 A schematic diagram of an oscillating jet formed by a jet nozzle of the present invention; Figure 4 It is a schematic diagram of the oscillating jet sweep of the jet nozzle of the present invention; In the figure, 1 is a nozzle, 2 is a jet nozzle, 3 is an electric sealing device, 4 is a furnace, 5 is a driving device, 6 is a sootblowing steam source, 7 is a hollow island structure, 8 is a first reflow chamber, 9 is a second reflow chamber, 10 is a mixing chamber, 11 is an outlet of the mixing chamber, 12 is a steam outlet of the nozzle, 13 is a reflow streamline, 14 is a main jet streamline, 15 is an oscillating jet sweep angle, and 16 is a heating surface of the furnace. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] In view of the problems of high failure rate and high power consumption of existing steam soot blowers, this embodiment provides a self-excited oscillating jet steam soot blower. Figure 1 As shown, the self-excited oscillating jet steam sootblower includes a sootblowing steam source 6 disposed outside the furnace 4; a nozzle 1 connected to the sootblowing steam source 6 at one end and extending to the other end in the furnace 4; and a driving device 5 capable of driving the nozzle 1 to move.

[0017] Among them, the sootblowing steam source 6 is used to provide high-temperature steam; the nozzle 1 is used to adjust the flow rate of the fluid to ensure that the fluid can pass through at the required speed and pressure under specific conditions; a plurality of jet nozzles 2 are installed at one end of the nozzle 1 in the furnace 4, and the jet nozzle 2 can convert pressure energy into kinetic energy and spray the fluid at a high speed. The driving device 5 can use an electric cylinder, a hydraulic cylinder, or a motor with a gear rack and other structures to drive the nozzle 1 to move horizontally.

[0018] When the sootblowing steam source 6 introduces steam into the nozzle 1, the steam enters the jet nozzle 2 from the nozzle 1, and finally forms a periodic oscillating jet with a certain sweep angle after passing through the jet nozzle 2. The oscillating jet is sprayed on the boiler water-cooled wall tube on the furnace heating surface. The driving device 5 drives the nozzle 1 to move horizontally, thereby cleaning the boiler heating surface on the plane where the jet nozzle 2 is located, thereby achieving the sootblowing work of the furnace heating surface without rotation, reducing the complexity of the sootblower sealing structure and the probability of air leakage.

[0019] Furthermore, the jet nozzle 2 and the end of the nozzle 1 in this embodiment adopt the following structure: like Figure 2As shown, in this embodiment, four jet nozzles 2 are symmetrically installed at one end of the nozzle 1 in the furnace 4. The nozzle 1 extends into the furnace 4 and the end of the tube is closed, the tube wall at the end of the nozzle 1 is connected with the jet nozzle 2, and a nozzle steam outlet 12 is formed at the connection; the nozzle steam outlet 12 is a section of a tapered channel, which is used to increase the steam velocity at the inlet of the jet nozzle. The high-speed steam makes it easier for the nozzle to generate an oscillating jet on the one hand, and on the other hand, it helps to increase the sweep angle of the nozzle oscillating jet.

[0020] The jet nozzle 2 includes a mixing chamber 10, a first reflow chamber 8 and a second reflow chamber 9; the jet nozzle 2 is a cubic cavity structure as a whole, and the cavity is divided into a mixing chamber 10, a first reflow chamber 8 and a second reflow chamber 9 by two symmetrically arranged hollow island structures 7. The first reflow chamber 8 and the second reflow chamber 9 are symmetrically arranged on both sides of the mixing chamber 10, and the first reflow chamber 8 and the second reflow chamber 9 are connected to the mixing chamber 10 at their inlet and outlet. The inlet of the mixing chamber, the inlet of the first reflow chamber 8, the inlet of the second reflow chamber 9, and the nozzle steam outlet 12 of the nozzle 1 are connected; the inlet of the mixing chamber 10 is a section of a gradually contracting channel in the opposite direction of the nozzle steam outlet 12. The middle section of the mixing chamber 10 is a straight cavity section, and the middle section of the mixing chamber 10 is connected to the outlet of the first reflow chamber 8 and the outlet of the second reflow chamber 9; the outlet 11 of the mixing chamber is a gradually expanding smooth channel that first contracts inward and then expands outward, which can effectively reduce the flow loss of the oscillating jet.

[0021] When steam enters the mixing chamber of the jet nozzle 2 from the nozzle steam outlet 12, due to the wall attachment effect of the fluid, the steam will adhere to the wall surface when passing through the curved section of the hollow island structure 7, and enter the reflow channel near the mixing chamber outlet 11 like the reflow streamline 13, thereby causing a pressure difference between the first reflow chamber 8 and the second reflow chamber 9, causing the main jet in the mixing chamber to deflect like the main jet streamline 14. The reflow will alternate between the first reflow chamber 8 and the second reflow chamber 9, causing the main jet to generate an oscillating jet at the mixing chamber outlet.

[0022] Compared with the stable impinging jet, the oscillating jet can form an obvious entrainment vortex on the impact surface, making the steam airflow near the heated surface more turbulent, thereby enhancing the mass transfer process between the jet and the impact surface, making the vibrating jet have a better cleaning effect.

[0023] In addition, since the nozzle 1 is extended into or out of the furnace 4 by horizontal movement through the driving device 5, a hole is provided on the outer wall of the furnace 4 to cooperate with the nozzle 1 to extend into or out, and an electric sealing device 3 is installed at the hole; the electric sealing device 3 can adopt an electric gate, which is closed when the nozzle 1 exits the furnace 4 and opened when the nozzle 1 extends into the furnace 4, so as to meet the normal use of the furnace 4 and steam soot blowing.

[0024] In summary, with the self-excited oscillating jet steam sootblower, when the sootblowing steam source 6 passes steam into the nozzle 1 of the sootblower; Figure 3 As shown in the figure, the steam direction is shown by the arrow in the figure. The steam enters the jet nozzle 2 from the nozzle 1, and forms a periodic oscillating jet with a certain sweep angle after passing through the jet nozzle 2. The sweep angle of the oscillating jet is 15 as shown in FIG. Figure 4 As shown; the oscillating jet is sprayed on the furnace heating surface 16 such as the boiler water-cooled wall tube, and the boiler heating surface on the plane where the jet nozzle 2 is located is cleaned; the nozzle 1 is driven by the driving device 5 to gradually extend into the furnace 4, thereby completing the cleaning of the entire heating surface; after the sootblowing is completed, the nozzle 1 is driven by the driving device 5 to return to the initial position. The oscillating jet generated by the self-excited oscillating jet steam sootblower has a more turbulent flow field near the heating surface, so that the steam sprayed by the sootblower has a stronger cleaning ability, which can reduce the steam usage of sootblowing to a certain extent. At the same time, the sootblower that does not need to rotate also eliminates the power consumption of the rotating motor, which is more energy-saving than the conventional steam sootblower.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-excited oscillating jet steam sootblower, characterized in that: The self-excited oscillating jet steam sootblower comprises a sootblowing steam source disposed outside the furnace; a nozzle having one end connected to the sootblowing steam source pipeline and the other end extending to the furnace; and a driving device capable of driving the nozzle to move; The nozzle can move horizontally and extend into or out of the furnace through a driving device; a plurality of jet nozzles are installed at one end of the nozzle in the furnace; when a soot-blowing steam source introduces steam into the nozzle, the steam enters the jet nozzle through the nozzle, and finally forms a periodic oscillating jet with a certain sweeping angle after passing through the jet nozzle, and the oscillating jet is sprayed on the boiler water-cooled wall tube on the heating surface of the furnace to clean the boiler heating surface on the plane where the jet nozzle is located.

2. The self-excited oscillating jet steam sootblower according to claim 1, characterized in that: A nozzle steam outlet is formed at the connection point between the nozzle end and the jet nozzle; the nozzle steam outlet is a gradually contracting channel.

3. The self-excited oscillating jet steam sootblower according to claim 2, characterized in that: The jet nozzle includes a mixing chamber, a first reflux chamber and a second reflux chamber; the jet nozzle as a whole is a cubic chamber structure, which is divided into a mixing chamber, a first reflux chamber and a second reflux chamber by two symmetrically arranged hollow island structures, the first reflux chamber and the second reflux chamber are symmetrically arranged on both sides of the mixing chamber, and the first reflux chamber and the second reflux chamber are connected to the mixing chamber at their inlets and outlets.

4. The self-excited oscillating jet steam sootblower according to claim 3 is characterized in that: The inlet of the mixing chamber, the inlet of the first reflux chamber, the inlet of the second reflux chamber, and the nozzle steam outlet of the nozzle are connected; the inlet of the mixing chamber is a gradually contracting channel in the opposite direction to the nozzle steam outlet.

5. The self-excited oscillating jet steam sootblower according to claim 3, characterized in that: The middle section of the mixing chamber is a straight chamber section, and the middle section of the mixing chamber is connected with the outlet of the first reflux chamber and the outlet of the second reflux chamber; the outlet of the mixing chamber is a gradually expanding smooth channel that first contracts inwards and then expands outwards.

6. The self-excited oscillating jet steam sootblower according to claim 1, characterized in that: Four jet nozzles are symmetrically installed at one end of the nozzle in the furnace.

7. The self-excited oscillating jet steam sootblower according to claim 1, characterized in that: The outer wall of the furnace is provided with a hole for the nozzle to extend into or exit, and an electric sealing device is installed at the hole.

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