A wide-channel waveform heat storage element for air preheater to prevent ash blockage

Abstract

This utility model discloses a wide-channel corrugated heat storage element for air preheaters, specifically an anti-clogging ash channel corrugated heat storage element for air preheaters. It includes a first square plate, a first corrugated plate, and a second corrugated plate. Several limiting rods are fixedly installed on one side of the first square plate, with one end of each limiting rod passing through the staggered first and second corrugated plates. One end of each limiting rod is equipped with a clamping assembly for pressing the first and second corrugated plates. Several springs are fitted onto the limiting rods, with the springs located between the first and second corrugated plates. This utility model, by placing springs between the first and second corrugated plates and using the clamping assembly to press the first and second corrugated plates, enables the first and second corrugated plates to separate during cleaning, thus removing dead-angle ash and preventing continuous ash accumulation that could lead to channel blockage.

Description

Technical Field

[0001] This utility model relates to the technical field of air preheater heat storage elements, specifically an air preheater anti-clogging ash wide channel waveform heat storage element. Background Technology

[0002] During operation of coal-fired power units, the flue gas side resistance of the air preheater gradually increases with the duration of use due to various reasons, especially in denitrification units. Under near-full load conditions, the maximum flue gas side resistance of the air preheater may far exceed the design value. Increased flue gas side resistance leads to a significant decrease in the output of the induced draft system, affecting the unit's load-carrying capacity, increasing the risk of induced draft fan stall, and reducing the reliability of unit operation. Therefore, it is necessary to readjust the design and configuration of the air preheater's heat storage elements to adapt to the normal operation of SCR units, avoid or reduce the reduction in boiler unit availability due to excessive ash blockage in the air preheater, and modify the air preheater's heat storage elements through reasonable modification schemes. This will ensure the safe and stable operation of the unit while continuously improving its safety and economy, ultimately achieving a green, environmentally friendly, and energy-saving modern enterprise.

[0003] With the requirements of ultra-clean emission policies, full-load denitrification and stricter NOx emission standards in domestic coal-fired power units will increase the escape of ammonia during denitrification, and exacerbate the risk of ash blockage in preheaters. Traditional DU-type heat storage elements are prone to causing ammonium bisulfate substances generated during ammonia escape during denitrification to be difficult to remove, leading to increasingly severe internal blockage and ultimately reducing ventilation. The DU corrugated type has been used in the market for more than 20 years and is currently the most widely used corrugated type. The most prominent feature of the DU corrugated type is that the positioning plate has both oblique corrugations and straight corrugations, while the corrugated plate is entirely oblique corrugated. The oblique corrugations on the positioning plate and the corrugated plate are in opposite directions. The heat exchange performance and resistance performance of the DU corrugated type are relatively balanced, and it is usually used in the hot end and medium temperature end of non-denitrification preheaters.

[0004] However, the DU corrugated heat storage element is not suitable for denitrification preheaters. The internal channels of this type of heat storage element are uneven and irregular; it has "contraction points" or small local gaps that easily cause fouling; the penetration ability of soot blowing and cleaning media is weak, making it difficult to clean. When flue gas or purging steam and high-pressure water pass through the DU corrugated channel, the energy at the inlet and outlet ends will be oblique and divergent, causing airflow energy attenuation, thus failing to guarantee the heat storage element's anti-fouling and easy-to-clean performance. Therefore, a wide-channel corrugated heat storage element for air preheaters with anti-fouling properties has been invented. Utility Model Content

[0005] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0006] A wide-channel corrugated heat storage element for preventing ash blockage in an air preheater includes a first square plate, a first corrugated plate, and a second corrugated plate. Several limiting rods are fixedly installed on one side of the first square plate, and one end of the limiting rod passes through the first and second corrugated plates arranged in an alternating pattern. One end of the limiting rod is provided with a pressing assembly for squeezing the first and second corrugated plates. Several springs are sleeved on the limiting rod, and the springs are located between the first and second corrugated plates.

[0007] As a preferred embodiment of the anti-clogging ash wide channel waveform heat storage element of the air preheater described in this utility model, wherein: the first corrugated plate is provided with oblique waves, and the second corrugated plate is provided with oblique waves and straight waves.

[0008] As a preferred embodiment of the anti-clogging ash wide channel waveform heat storage element of the air preheater described in this utility model, wherein: a plurality of first through holes are provided on the first corrugated plate, and one end of the limiting rod passes through the first through hole.

[0009] As a preferred embodiment of the anti-clogging ash wide channel waveform heat storage element of the air preheater described in this utility model, wherein: a plurality of second through holes are provided on the second corrugated plate, and one end of the limiting rod passes through the second through hole.

[0010] As a preferred embodiment of the anti-clogging ash wide-channel waveform heat storage element for air preheaters described in this utility model, the clamping assembly includes:

[0011] A second square plate is slidably connected to a plurality of limiting rods, and the first corrugated plate and the second corrugated plate are located between the first square plate and the second square plate;

[0012] The first stud is fixedly installed on one end of the limiting rod;

[0013] The second stud is fixedly installed on one end of the first stud, and the thread directions of the first stud and the second stud are set to be opposite.

[0014] As a preferred embodiment of the anti-clogging ash wide-channel waveform heat storage element for an air preheater according to this utility model, the clamping assembly further includes:

[0015] A first nut, which is threaded onto a first stud;

[0016] The second nut is threaded onto the second stud.

[0017] In a preferred embodiment of the air preheater anti-clogging wide-channel waveform heat storage element of this utility model, the diameter of the first stud is greater than the diameter of the second stud, and the diameter of the first nut is greater than the diameter of the second nut.

[0018] As a preferred embodiment of the anti-clogging ash wide-channel waveform heat storage element for air preheaters described in this utility model, the clamping assembly includes:

[0019] A third-party board, wherein several limiting rods are fixedly installed on one side of the third-party board;

[0020] An electric push rod is fixedly installed in the middle of the other side of the third-party plate;

[0021] The fourth square plate is fixedly installed by the push rod of the electric push rod passing through the third square plate. Several limiting rods are slidably connected on the fourth square plate, and the first corrugated plate and the second corrugated plate are located between the first square plate and the fourth square plate.

[0022] Compared with existing technologies:

[0023] By setting a spring between the first corrugated plate and the second corrugated plate, and by squeezing the first corrugated plate and the second corrugated plate by a clamping assembly, the first corrugated plate and the second corrugated plate can be separated during cleaning to remove dirt and grime from dead corners and prevent the continuous accumulation of dirt from causing channel blockage. Attached Figure Description

[0024] Figure 1 This is a front view schematic diagram of the structure of Embodiment 1 of this utility model;

[0025] Figure 2 This utility model Figure 1 Enlarged schematic diagram of the structure at point A in the middle;

[0026] Figure 3 This is a schematic diagram of the structure of the first and second corrugated plates of this utility model;

[0027] Figure 4 This is a front view schematic diagram of the structure of Embodiment 2 of this utility model.

[0028] In the figure: First corrugated plate 10, first through hole 11, second corrugated plate 20, second through hole 21, first square plate 30, limit rod 31, spring 32, second square plate 40, first stud 41, second stud 42, first nut 43, second nut 44, third square plate 50, electric push rod 51, fourth square plate 52. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0030] Example 1:

[0031] This utility model provides a wide-channel waveform heat storage element for preventing ash blockage in an air preheater. Please refer to [link / reference]. Figures 1-3The system includes a first square plate 30, a first corrugated plate 10, and a second corrugated plate 20. Several limiting rods 31 are fixedly installed on one side of the first square plate 30, and one end of the limiting rod 31 passes through the first corrugated plate 10 and the second corrugated plate 20 arranged in an alternating pattern. One end of the limiting rod 31 is provided with a pressing assembly for squeezing the first corrugated plate 10 and the second corrugated plate 20. Several springs 32 are sleeved on the limiting rod 31, and the springs 32 are located between the first corrugated plate 10 and the second corrugated plate 20. The first corrugated plate 10 is provided with oblique waves, and the second corrugated plate 20 is provided with oblique waves and straight waves. Several first through holes 11 are opened on the first corrugated plate 10, and one end of the limiting rod 31 passes through the first through hole 11. Several second through holes 21 are opened on the second corrugated plate 20, and one end of the limiting rod 31 passes through the second through hole 21.

[0032] The clamping assembly includes: a second square plate 40, a first stud 41, a second stud 42, a first nut 43, and a second nut 44;

[0033] Several limiting rods 31 are slidably connected on the second square plate 40, and the first corrugated plate 10 and the second corrugated plate 20 are located between the first square plate 30 and the second square plate 40. The first stud 41 is fixedly installed on one end of the limiting rod 31, and the second stud 42 is fixedly installed on one end of the first stud 41. The thread directions of the first stud 41 and the second stud 42 are set to be opposite. The first nut 43 is threadedly connected to the first stud 41, and the second nut 44 is threadedly connected to the second stud 42. The diameter of the first stud 41 is larger than the diameter of the second stud 42, and the diameter of the first nut 43 is larger than the diameter of the second nut 44.

[0034] In practical use, the specific operating steps for those skilled in the art are as follows:

[0035] During installation, first, one end of the limiting rod 31 passes through the staggered first corrugated plate 10 and second corrugated plate 20. Then, the second square plate 40 is slidably connected to the limiting rod 31. After that, the first nut 43 and the second nut 44 are sequentially threaded onto the first stud 41 and the second stud 42 to compress the first corrugated plate 10 and the second corrugated plate 20. At this time, the spring 32 will deform. When cleaning is required, first remove the first nut 43 and the second nut 44 so that the first corrugated plate 10 and the second corrugated plate 20 are separated under the action of the spring 32. At this time, the dirt in the dead corners can be removed by rinsing, avoiding the continuous accumulation of dirt that will cause the channel to be blocked.

[0036] Example 2:

[0037] This utility model provides a wide-channel waveform heat storage element for preventing ash blockage in an air preheater. Please refer to [link / reference]. Figure 4 The clamping assembly includes: a third-party plate 50, an electric push rod 51, and a fourth-party plate 52;

[0038] Several limiting rods 31 are fixedly installed on one side of the third-party plate 50, and an electric push rod 51 is fixedly installed in the middle of the other side of the third-party plate 50. The push rod of the electric push rod 51 passes through the third-party plate 50 and a fourth plate 52 is fixedly installed. Several limiting rods 31 are slidably connected on the fourth plate 52, and the first corrugated plate 10 and the second corrugated plate 20 are located between the first plate 30 and the fourth plate 52. The third-party plate 50 and the limiting rods 31 are connected by screws, and the electric push rod 51 is powered by a battery, which can be installed on the third-party plate 50.

[0039] In practical use, the specific operating steps for those skilled in the art are as follows:

[0040] During installation, first, one end of the limiting rod 31 passes through the staggered first corrugated plate 10 and second corrugated plate 20. Then, the fourth square plate 52 is slidably connected to the limiting rod 31. After that, the third square plate 50 is fixed to the limiting rod 31. Finally, the fourth square plate 52 is moved by the electric push rod 51 to press several first corrugated plates 10 and several second corrugated plates 20 together. At this time, the spring 32 will deform. When cleaning is required, the fourth square plate 52 is returned to its original position by the electric push rod 51, so that the first corrugated plate 10 and the second corrugated plate 20 are separated under the action of the spring 32. At this time, the dirt in the dead corners can be removed by rinsing, avoiding the continuous accumulation of dirt that will block the channel.

[0041] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A wide-channel corrugated heat storage element for preventing ash blockage in an air preheater, comprising a first square plate (30), a first corrugated plate (10), and a second corrugated plate (20), characterized in that, A plurality of limiting rods (31) are fixedly installed on one side of the first square plate (30), and one end of the limiting rod (31) passes through the first corrugated plate (10) and the second corrugated plate (20) arranged in an alternating manner. One end of the limiting rod (31) is provided with a pressing assembly for pressing the first corrugated plate (10) and the second corrugated plate (20). A plurality of springs (32) are sleeved on the limiting rod (31), and the springs (32) are located between the first corrugated plate (10) and the second corrugated plate (20).

2. The anti-clogging ash wide-channel waveform heat storage element for an air preheater according to claim 1, characterized in that, The first corrugated plate (10) is provided with oblique waves, and the second corrugated plate (20) is provided with oblique waves and straight waves.

3. The anti-clogging ash wide-channel waveform heat storage element for an air preheater according to claim 1, characterized in that, The first corrugated plate (10) has a plurality of first through holes (11), and one end of the limiting rod (31) passes through the first through hole (11).

4. The anti-clogging ash wide-channel waveform heat storage element for an air preheater according to claim 1, characterized in that, The second corrugated plate (20) has several second through holes (21), and one end of the limiting rod (31) passes through the second through hole (21).

5. The anti-clogging ash wide-channel waveform heat storage element for an air preheater according to claim 1, characterized in that, The clamping assembly includes: The second square plate (40) has several limiting rods (31) slidably connected on it, and the first corrugated plate (10) and the second corrugated plate (20) are located between the first square plate (30) and the second square plate (40). The first stud (41) is fixedly installed on one end of the limiting rod (31); The second stud (42) is fixedly installed on one end of the first stud (41), and the thread directions of the first stud (41) and the second stud (42) are set to be opposite.

6. The anti-clogging ash wide-channel waveform heat storage element for an air preheater according to claim 5, characterized in that, The clamping assembly also includes: The first nut (43) is threaded onto the first stud (41); The second nut (44) is threaded onto the second stud (42).

7. The anti-clogging ash wide-channel waveform heat storage element for an air preheater according to claim 6, characterized in that, The diameter of the first stud (41) is greater than the diameter of the second stud (42), and the diameter of the first nut (43) is greater than the diameter of the second nut (44).

8. The anti-clogging ash wide-channel waveform heat storage element for an air preheater according to claim 1, characterized in that, The clamping assembly includes: A third-party plate (50), wherein several limiting rods (31) are fixedly installed on one side of the third-party plate (50); An electric push rod (51) is fixedly installed in the middle of the other side of the third-party plate (50); The fourth square plate (52) is fixedly installed on the electric push rod (51) through the third square plate (50). Several limiting rods (31) are slidably connected on the fourth square plate (52), and the first corrugated plate (10) and the second corrugated plate (20) are located between the first square plate (30) and the fourth square plate (52).

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