A soot blowing system for a boiler secondary air box

Abstract

The present disclosure relates to a soot blowing system for a boiler secondary air box, comprising a soot blowing main pipe; at least one connecting pipe arranged at intervals along the length direction of the air box, one end of the connecting pipe being communicated with the soot blowing main pipe, and the other end of the connecting pipe extending into the air box; a soot blowing group corresponding to the connecting pipe, comprising a first soot blowing pipe and a second soot blowing pipe, the first soot blowing pipe and the second soot blowing pipe being communicated with the connecting pipe and extending along the length direction of the air box, the number of the first soot blowing pipe being multiple, and the multiple first soot blowing pipes being installed at intervals along the width direction of the air box on the bottom wall of the air box, the second soot blowing pipe being installed on the air box and being located on the side of the first soot blowing pipe away from the bottom wall of the air box; a plurality of first soot blowing pieces being communicated on the first soot blowing pipe, a plurality of second soot blowing pieces being communicated on the second soot blowing pipe, and the plurality of first soot blowing pieces and the plurality of second soot blowing pieces being arranged at intervals along the length direction of the air box for blowing off the dust in the air box. Through the above technical solution, the soot blowing system for the boiler secondary air box can clean the dust in the air box in time.

Description

Technical Field

[0001] This disclosure relates to the field of air box cleaning technology, specifically to a soot blowing system for a boiler secondary air box. Background Technology

[0002] After a period of use, secondary air boxes and combustion air boxes in power plants accumulate a lot of dust inside, with some ash layers reaching up to 1.5 meters thick. This dust accumulation affects airflow within the air box, causing blockages in some secondary air passages and resulting in insufficient secondary air entering the furnace. Consequently, the secondary air cannot mix adequately with the pulverized coal airflow, further leading to incomplete combustion of the pulverized coal and a decrease in boiler efficiency. Furthermore, excessive ash accumulation increases the weight of the air box, making its structure unstable and increasing safety hazards.

[0003] Therefore, it is necessary to clean the ash inside the bellows regularly. Currently, the main method for cleaning the ash inside the bellows is to open the bellows during boiler shutdown maintenance and then clean it manually. This method not only requires a lot of manpower, material resources, and financial resources, but also easily leads to personal safety accidents and harms health. In addition, the cleaning time is also limited by the boiler shutdown maintenance time, making it impossible to clean the ash in a timely manner. Summary of the Invention

[0004] The purpose of this disclosure is to provide a soot blowing system for a boiler secondary air box, which can promptly clean the dust in the air box.

[0005] To achieve the above objectives, this disclosure provides a soot blowing system for a boiler secondary air box. The soot blowing system includes: a main soot blowing pipe for supplying soot blowing medium; at least one connecting pipe, spaced apart along the length of the air box, one end of which connects to the main soot blowing pipe, and the other end passing through the side wall of the air box and extending into the air box; and soot blowing groups, the number of soot blowing groups being equal to the number of connecting pipes and arranged in a one-to-one correspondence. Each soot blowing group includes: a first soot blowing pipe and a second soot blowing pipe, the first soot blowing pipe and the... The second soot blowing pipe is connected to the connecting pipe and extends along the length of the air box. There are multiple first soot blowing pipes, and these multiple first soot blowing pipes are installed at intervals along the width of the air box on the bottom wall of the air box. The second soot blowing pipe is installed on the air box and is located on the side of the first soot blowing pipe away from the bottom wall of the air box. Multiple first soot blowing elements are connected to the first soot blowing pipe, and multiple second soot blowing elements are connected to the second soot blowing pipe. The multiple first soot blowing elements and the multiple second soot blowing elements are arranged at intervals along the length of the air box for blowing away the dust in the air box.

[0006] Optionally, each of the soot blowing groups includes a connecting pipe and two first soot blowing pipes, one end of which is connected to the connecting pipe and the other end of which is connected to the other first soot blowing pipe through the connecting pipe. The two first soot blowing pipes are installed on the bottom wall of the air box and arranged opposite to each other. The second soot blowing pipe is installed on the top wall of the air box and is equidistant from the two first soot blowing pipes.

[0007] Optionally, the distance between the second soot blowing pipe and the bottom wall of the air box is 0.4m to 0.6m.

[0008] Optionally, the first soot blowing component is configured as a disc soot blower or a first wide-angle soot blower, and the second soot blowing component is configured as a second wide-angle soot blower or an acoustic soot blower.

[0009] Optionally, a plurality of first wide-angle soot blowers are provided on the side of the first soot blowing pipe away from the side wall of the air box, or a plurality of first wide-angle soot blowers are provided on opposite sides of the first soot blowing pipe.

[0010] Optionally, a plurality of disc soot blowers are provided on the side of the first soot blowing pipe away from the bottom wall of the air box.

[0011] Optionally, the second soot blowing pipe is connected to a plurality of the acoustic soot blowers, and two second wide-angle soot blowers are arranged at intervals between any two adjacent acoustic soot blowers.

[0012] Optionally, the distance between two adjacent connecting pipes is 3m to 5m.

[0013] Optionally, the soot blowing system for the boiler secondary air box further includes an air storage tank, a first pressure gauge, and a second pressure gauge. The air inlet of the air storage tank is connected to a soot blowing medium source through an air inlet pipe, and the air outlet of the air storage tank is connected to the soot blowing header. The first pressure gauge is used to detect the pressure of the air storage tank, and the second pressure gauge is used to detect the pressure inside the soot blowing header.

[0014] Optionally, the intake pipe is provided with a first manual valve and a second manual valve, which are arranged at intervals along the extension direction of the intake pipe.

[0015] Optionally, a third manual valve and a first solenoid valve are provided on the soot blowing main pipe, the third manual valve and the first solenoid valve are arranged at intervals along the extension direction of the soot blowing main pipe, and a second solenoid valve is provided on each of the connecting pipes.

[0016] Optionally, the gas storage tank is connected to the outside via a first drain valve, and the soot blowing header is connected to the outside via a second drain valve.

[0017] Through the above technical solution, in the soot blowing system for a boiler secondary air box provided in this disclosure, since the soot blowing header pipe is connected to the connecting pipe, and the connecting pipe is connected to the first soot blowing pipe and the second soot blowing pipe respectively, the soot blowing medium can flow from the soot blowing header pipe to the connecting pipe and enter the first soot blowing pipe and the second soot blowing pipe respectively; in addition, since multiple first soot blowing elements are connected to the first soot blowing pipe along the length of the air box, and the first soot blowing pipe is installed on the bottom wall of the air box, the soot blowing medium blown out by the first soot blowing elements can act on the dust on the bottom wall of the air box to sweep away the dust and remove it from the bottom wall of the air box; furthermore, since multiple second soot blowing elements are connected to the second soot blowing pipe along the length of the air box, and the second soot blowing pipe is located on the side of the first soot blowing pipe away from the bottom wall of the air box (i.e., referring to...), Figure 3 As shown in the diagram, the second soot blowing pipe is located above the first soot blowing pipe. This allows the soot blowing medium, blown by the second soot blowing element, to continue acting on the dust, suspending the dust in the air box. In other words, the dust on the bottom wall of the air box, after being blown by the first and second soot blowing elements, can leave the bottom wall and remain suspended in the air box, allowing it to exit with the flue gas. Therefore, this soot blowing system for a boiler secondary air box can promptly clean the dust in the air box using the first and second soot blowing elements.

[0018] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a partial top view of a soot blowing system for a boiler secondary air box provided in an embodiment of this disclosure;

[0021] Figure 2 This is a schematic diagram of the structure of a soot blowing system for a boiler secondary air box provided in an embodiment of this disclosure;

[0022] Figure 3 This is a partial side view of a soot blowing system for a boiler secondary air box provided in an embodiment of this disclosure.

[0023] Explanation of reference numerals in the attached figures

[0024] 1. Main soot blowing pipe; 2. Connecting pipe; 21. Second solenoid valve; 3. Air box; 41. First soot blowing pipe; 42. Second soot blowing pipe; 43. Connecting pipe; 44. First wide-angle soot blower; 45. Disc soot blower; 46. Second wide-angle soot blower; 47. Acoustic soot blower; 5. Air tank; 61. First pressure gauge; 62. Second pressure gauge; 7. Air inlet pipe; 81. First manual valve; 82. Second manual valve; 83. Third manual valve; 84. First solenoid valve; 91. First drain valve; 92. Second drain valve. Detailed Implementation

[0025] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0026] In this disclosure, unless otherwise stated, directional terms such as "top" and "bottom" generally refer to the "top" and "bottom" along the height direction relative to the corresponding component in its operating state. The terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or material significance. Furthermore, in the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements. The above definitions are for explanation and illustration only and should not be construed as limiting this disclosure.

[0027] According to a specific embodiment of this disclosure, a soot blowing system for a boiler secondary air box is provided, with reference to... Figures 1 to 3 As shown, the soot blowing system for a boiler secondary air box includes: a soot blowing main pipe 1 for supplying soot blowing medium; at least one connecting pipe 2, which is spaced along the length of the air box 3, with one end of the connecting pipe 2 connected to the soot blowing main pipe 1 and the other end passing through the side wall of the air box 3 and extending into the air box 3; and soot blowing groups, the number of soot blowing groups being equal to the number of connecting pipes 2 and arranged in a one-to-one correspondence, the soot blowing group including: a first soot blowing pipe 41 and a second soot blowing pipe 42, the first soot blowing pipe 41 and the second soot blowing pipe 42 being respectively connected to the main pipe 1; and soot blowing groups, the number of soot blowing groups being equal to the number of connecting pipes 2 and arranged in a one-to-one correspondence, the soot blowing groups including: a first soot blowing pipe 41 and a second soot blowing pipe 42, the first soot blowing pipe 41 and the second soot blowing pipe 42 being connected to the main pipe 1; and soot blowing groups, the number of soot blowing groups being equal to the number of connecting pipes 2 and arranged in a one-to-one correspondence ... The connecting pipe 2 extends along the length of the air box 3. There are multiple first blowing pipes 41, which are installed at intervals along the width of the air box 3 on the bottom wall of the air box 3. The second blowing pipe 42 is installed on the air box 3 and is located on the side of the first blowing pipe 41 away from the bottom wall of the air box 3. Multiple first blowing elements are connected to the first blowing pipe 41, and multiple second blowing elements are connected to the second blowing pipe 42. The multiple first blowing elements and multiple second blowing elements are arranged at intervals along the length of the air box 3 for blowing away the dust in the air box 3.

[0028] Through the above technical solution, in the soot blowing system for a boiler secondary air box provided in this disclosure, since the soot blowing header 1 is connected to the connecting pipe 2, and the connecting pipe 2 is connected to the first soot blowing pipe 41 and the second soot blowing pipe 42 respectively, the soot blowing medium can flow from the soot blowing header 1 to the connecting pipe 2, and enter the first soot blowing pipe 41 and the second soot blowing pipe 42 respectively; in addition, since multiple first soot blowing elements are connected to the first soot blowing pipe 41 along the length of the air box 3, and the first soot blowing pipe 41 is installed on the bottom wall of the air box 3, the soot blowing medium blown out by the first soot blowing elements can act on the dust on the bottom wall of the air box 3 to sweep away the dust and make the dust leave the bottom wall of the air box 3; furthermore, since multiple second soot blowing elements are connected to the second soot blowing pipe 42 along the length of the air box 3, and the second soot blowing pipe 42 is located on the side of the first soot blowing pipe 41 away from the bottom wall of the air box 3 (i.e., referring to...), Figure 3 As shown in the diagram, the second soot blowing pipe 42 is located above the first soot blowing pipe 41. This allows the soot blowing medium blown out by the second soot blowing element to continue acting on the dust, suspending the dust in the air box 3. In other words, the dust on the bottom wall of the air box 3, after being blown by the first and second soot blowing elements, can leave the bottom wall of the air box 3 and remain suspended in the air box 3, allowing the dust to exit the air box 3 with the flue gas. Therefore, this soot blowing system for a boiler secondary air box can promptly clean the dust in the air box 3 using the first and second soot blowing elements.

[0029] In this disclosure, the blowing medium can be compressed air, steam, etc., and this disclosure does not impose any specific restrictions on it.

[0030] The soot blowing system for a boiler secondary air box provided in this disclosure can be constructed in any suitable manner. As an exemplary embodiment, reference is made to... Figure 1 and Figure 3 As shown, each soot blowing group may include a connecting pipe 43 and two first soot blowing pipes 41. One end of one first soot blowing pipe 41 can be connected to a connecting pipe 2, and the other end can be connected to another first soot blowing pipe 41 through the connecting pipe 43. The two first soot blowing pipes 41 can be installed on the bottom wall of the bellows 3 and arranged opposite each other. The second soot blowing pipe 42 can be installed on the top wall of the bellows 3, and the distance from the two first soot blowing pipes 41 is equal. The two first soot blowing pipes 41 can be installed on the bottom wall of the bellows 3 near the two side walls, or they can be installed on other locations on the bottom wall of the bellows 3 where dust easily accumulates, so that the soot blowing medium flowing out of the first soot blowing component can act on the dust on the bottom wall of the bellows 3 as much as possible. Furthermore, since the second soot blowing pipe 42 is installed on the top wall of the bellows 3 and the distance from the two first soot blowing pipes 41 is equal (i.e., referring to...), Figure 3As shown, the second soot blowing pipe 42 and the two first soot blowing pipes 41 can be arranged in an isosceles triangle. In this way, the soot blowing medium blown out of the second soot blowing component can diffuse simultaneously in the direction of the two first soot blowing pipes 41, so that the soot blowing medium flowing out of the second soot blowing component can act on the dust blown up by the first soot blowing component on both sides at the same time.

[0031] The first soot blowing pipe 41 and the second soot blowing pipe 42 can be installed on the bottom wall and top wall of the air box 3 respectively by means of a bracket. The bracket can include a support part and a connecting part. The support part is constructed in a straight line or a T-shape and one end is fixed to the air box 3. The connecting part can be constructed in a U-shape. Both ends of the connecting part are fixed to the support part respectively, and the connecting part is sleeved on the first soot blowing pipe 41 or the second soot blowing pipe 42 to fix the first soot blowing pipe 41 or the second soot blowing pipe 42.

[0032] In this disclosure, the number of the first soot blowing pipe 41 and the second soot blowing pipe 42 can be selected according to the size of the bellows 3 and the dust distribution. In another exemplary embodiment, there can be three first soot blowing pipes 41, and the three first soot blowing pipes 41 are installed at intervals along the width direction of the bellows 3 on the bottom wall of the bellows 3. There can be two second soot blowing pipes 42, and the two second soot blowing pipes 42 are respectively arranged between two adjacent first soot blowing pipes 41. In other embodiments, other suitable numbers of first soot blowing pipes 41 and second soot blowing pipes 42 can also be selected, and this disclosure does not impose specific limitations on this.

[0033] In the soot blowing system for a boiler secondary air box provided in this disclosure, the second soot blowing pipe 42 can be installed in any suitable position. As an exemplary embodiment, refer to... Figure 3 As shown, the distance between the second soot blowing pipe 42 and the bottom wall of the air box 3 can be 0.4m to 0.6m. For example, the distance between the second soot blowing pipe 42 and the bottom wall of the air box 3 can be 0.4m, 0.5m, 0.6m, etc., and this disclosure does not impose specific limitations on this. In a specific embodiment, the second soot blowing pipe 42 is installed on the top wall of the air box 3, and the distance between the second soot blowing pipe 42 and the bottom wall of the air box 3 is 0.5m, and the distance between the second soot blowing pipe 42 and the top wall of the air box 3 is 200mm to 300mm.

[0034] The soot blowing system for a boiler secondary air box provided in this disclosure, wherein the first soot blowing element and the second soot blowing element can be constructed in any suitable manner, as an exemplary embodiment, refer to Figure 1As shown, the first sootblower can be configured as a disc sootblower 45 or a first wide-angle sootblower 44, and the second sootblower can be configured as a second wide-angle sootblower 46 or a sonic sootblower 47. In this way, the nozzle of the wide-angle sootblower operates a field effect, forcing the accumulated dust in the bellows 3 to be stirred up. The sonic sootblower can generate high-frequency, high-intensity sound waves. Utilizing the effect of instantaneous high-intensity sound field energy, through the refraction, reflection, and diffraction of sound waves, the dust is forced to be subjected to continuous sound wave energy thousands of times per second. This effect of thousands of impacts and vibrations per second causes the dust to undergo acoustic fatigue and fracture effects, forcing the accumulated dust to peel off and fall off from the bellows 3 and be carried away with the flue gas.

[0035] The first dust blowing component can be entirely constructed as a disc dust blower 45, entirely as a first wide-angle dust blower 44, or partially as a disc dust blower 45 with the remainder as a first wide-angle dust blower 44. The second dust blowing component can be entirely constructed as a sonic dust blower 47, partially as a second wide-angle dust blower 46 with the remainder as a sonic dust blower 47; this disclosure does not impose specific limitations in this regard. During actual installation, it is essential to ensure that the nozzle of the first dust blowing component is directed towards the location of dust deposition so that the dust blowing medium from the first dust blowing component can act on the dust as much as possible.

[0036] In one exemplary embodiment, the first soot blower may be configured as a first wide-angle soot blower 44, specifically, referring to... Figure 1 As shown, in one specific embodiment, a plurality of first wide-angle soot blowers 44 can be provided on the side of the first soot blowing pipe 41 away from the side wall of the air box 3. In this embodiment, the distance between two adjacent first wide-angle soot blowers 44 can be 100mm, and the total length of the first soot blowing pipe 41 can be 2400mm. In another specific embodiment, a plurality of first wide-angle soot blowers 44 can be provided on opposite sides of the first soot blowing pipe 41. In this embodiment, the distance between two adjacent first wide-angle soot blowers 44 can be 150mm, and the total length of the first soot blowing pipe 41 can be 2300mm.

[0037] In another exemplary embodiment, the first sootblower may be configured as a disc sootblower 45, specifically, referring to... Figure 1 As shown, in one specific embodiment, a plurality of disc soot blowers 45 may be provided on the side of the first soot blowing pipe 41 away from the bottom wall of the air box 3. In this embodiment, the distance between two adjacent disc soot blowers 45 is 450 mm.

[0038] The construction of the first soot blowing component can be arbitrarily combined. In this disclosure, when there are two first soot blowing pipes 41, the first soot blowing component includes six implementation methods. The first implementation method is: multiple first wide-angle soot blowers 44 can be arranged on the sides of the two first soot blowing pipes 41 that are close to each other (not shown in the figure); the second implementation method is: multiple first wide-angle soot blowers 44 can be arranged on both sides of any one of the first soot blowing pipes 41 (not shown in the figure); the third implementation method is: multiple disc soot blowers 45 can be arranged on the side of any one of the first soot blowing pipes 41 that is away from the bottom wall of the air box 3 (not shown in the figure); the fourth implementation method is: multiple first wide-angle soot blowers 44 can be arranged on the side of one of the first soot blowing pipes 41 that is away from the side wall of the air box 3, and multiple disc soot blowers 45 can be arranged on the side of the other first soot blowing pipe 41 that is away from the bottom wall of the air box 3. (Refer to...) Figure 1 The fifth implementation is as follows: Multiple first wide-angle soot blowers 44 can be respectively installed on both sides of one of the first soot blowers 41, and multiple disc soot blowers 45 can be installed on the side of the other first soot blower 41 away from the bottom wall of the air box 3. (See reference...) Figure 1 The arrangement of the left-side soot blowing group; the sixth implementation is: one of the first soot blowing pipes 41 can be provided with multiple first wide-angle soot blowers 44 on the side away from the side wall of the air box 3, and multiple first wide-angle soot blowers 44 can be provided on the opposite sides of the other first soot blowing pipe 41 respectively, not shown in the figure.

[0039] The soot blowing system for a boiler secondary air box provided in this disclosure, as an exemplary embodiment, refers to... Figure 1 As shown, multiple acoustic soot blowers 47 can be connected to the second soot blowing pipe 42, and two second wide-angle soot blowers 46 can be arranged at intervals between any two adjacent acoustic soot blowers 47. In this embodiment, the distance between two adjacent second wide-angle soot blowers 46, and the distance between the second wide-angle soot blower 46 and the acoustic soot blower 47 are both 450mm, and the total length of the second soot blowing pipe 42 is 2900mm.

[0040] The soot blowing system for a boiler secondary air box provided in this disclosure allows for any suitable distance between adjacent connecting pipes 2. As an exemplary embodiment, refer to... Figure 1 and Figure 2As shown, the spacing between two adjacent connecting pipes 2 can be 3m to 5m. Since the number of soot blowing groups is equal to the number of connecting pipes 2 and is set in a one-to-one correspondence, a soot blowing group needs to be set every 3m to 5m. In this way, multiple soot blowing groups can be arranged at intervals in the air box 3 along the length of the air box. The first soot blowing pipe 41 and the second soot blowing pipe 42 in the multiple soot blowing groups can also be arranged at intervals in the air box 3 along the length of the air box. Therefore, multiple first soot blowing elements and multiple second soot blowing elements can also be arranged at intervals in the air box 3 along the length of the air box to ensure that all dust in the entire air box 3 can be blown up by the first soot blowing elements and the second soot blowing elements, avoiding soot blowing dead corners.

[0041] The spacing between two adjacent soot blowing groups (i.e., the spacing between two adjacent connecting pipes 2) can be determined based on the lengths of the first soot blowing pipe 41 and the second soot blowing pipe 42, as well as the effective range of the first and second soot blowing components. This disclosure does not impose specific limitations on this. For example, the spacing between two adjacent connecting pipes 2 can be 3m, 4m, 5m, etc. In one specific embodiment, the spacing between two adjacent connecting pipes 2 is 4m. Furthermore, the number of soot blowing groups can also be appropriately selected based on the length of the air box 3. This disclosure does not impose specific limitations on this. In addition, compared to setting only one soot blowing group, the above-mentioned method of setting multiple soot blowing groups along the length of the air box 3 ensures that the pressure of the soot blowing medium in each soot blowing group meets the requirements, avoiding the problem of insufficient pressure caused by excessively long first and second soot blowing pipes 41 and 42, and further ensuring the soot blowing effect of the soot blowing system used in the boiler secondary air box.

[0042] To further improve the reliability of the soot blowing system for boiler secondary air boxes provided in this disclosure, as an exemplary embodiment, reference is made to... Figure 2As shown, the soot blowing system for the boiler secondary air box may further include an air storage tank 5, a first pressure gauge 61, and a second pressure gauge 62. The air inlet of the air storage tank 5 can be connected to the soot blowing medium source through an air inlet pipe 7, and the air outlet of the air storage tank 5 can be connected to the soot blowing header pipe 1. The first pressure gauge 61 is used to detect the pressure of the air storage tank 5, and the second pressure gauge 62 is used to detect the pressure inside the soot blowing header pipe 1. In this way, the air storage tank 5 can store the soot blowing medium and provide it to the first and second soot blowing components when needed. Compared with directly connecting the soot blowing header pipe 1 to the soot blowing medium source, the above-mentioned method of setting up the air storage tank 5 can ensure that the pressure of the soot blowing medium meets the requirements, thereby ensuring the soot blowing effect and avoiding poor dust removal caused by pressure fluctuations in the soot blowing medium source. In addition, the first pressure gauge 61 can detect the pressure in the air storage tank 5 in real time, which makes it easier to operate the soot blowing system for the boiler secondary air box when the pressure in the air storage tank 5 is sufficient, thereby improving the reliability of the soot blowing system; at the same time, the second pressure gauge 62 can also detect the pressure in the soot blowing header 1 in real time, which makes it easier to stop soot blowing when the pressure does not meet the requirements.

[0043] The soot blowing system for a boiler secondary air box provided in this disclosure, in order to facilitate the control of the on / off state of the soot blowing medium source and the soot blowing system, as an exemplary embodiment, refers to... Figure 1 As shown, a first manual valve 81 and a second manual valve 82 can be installed on the air inlet pipe 7, and the first manual valve 81 and the second manual valve 82 can be arranged at intervals along the extension direction of the air inlet pipe 7. Thus, by operating the first manual valve 81 and the second manual valve 82, the opening and closing of the air inlet pipe 7 can be controlled, thereby controlling the opening and closing of the soot blowing medium source and the air storage tank 5. When the soot blowing system for the boiler secondary air box is working normally, the first manual valve 81 and the second manual valve 82 are always kept open; when the soot blowing medium source malfunctions, or when the soot blowing system for the boiler secondary air box malfunctions and needs maintenance, the first manual valve 81 or the second manual valve 82 can be closed. Furthermore, if one of the first manual valve 81 and the second manual valve 82 malfunctions, the other can still be operated to control the soot blowing system for the boiler secondary air box, improving the reliability of the soot blowing system.

[0044] The soot blowing system for a boiler secondary air box provided in this disclosure, in order to facilitate the control of the working status of multiple soot blowing groups, as an exemplary embodiment, refers to... Figures 1 to 3As shown, a third manual valve 83 and a first solenoid valve 84 can be installed on the soot blowing main pipe 1. The third manual valve 83 and the first solenoid valve 84 can be arranged at intervals along the extension direction of the soot blowing main pipe 1, and a second solenoid valve 21 can be installed on each connecting pipe 2. The third manual valve 83 and the first solenoid valve 84 are located upstream of the connecting pipe 2. Thus, by operating the third manual valve 83 and the first solenoid valve 84, the on / off state of the soot blowing main pipe 1 can be controlled, thereby controlling the on / off state of the gas storage tank 5 and the connecting pipe 2. When the soot blowing system for the boiler secondary air box is working normally, the third manual valve 83 and the first solenoid valve 84 are always kept open. When the soot blowing system for the boiler secondary air box malfunctions and needs maintenance, the third manual valve 83 or the first solenoid valve 84 can be closed. Furthermore, the third manual valve 83 allows for manual disconnection of the soot blowing main pipe 1 in case of a malfunction of the first solenoid valve 84, improving the reliability of the soot blowing system.

[0045] Furthermore, by installing a second solenoid valve 21 on each connecting pipe 2, each soot blowing group can be controlled individually. Specifically, when the soot blowing system for the boiler secondary air box is in operation, one of the second solenoid valves 21 can be opened to put the corresponding soot blowing group into use, or multiple second solenoid valves 21 can be opened simultaneously to put multiple corresponding soot blowing groups into use simultaneously. In this disclosure, the number of second solenoid valves 21 opened simultaneously can be selected according to the pressure of the soot blowing medium in the soot blowing header 1 to ensure the soot blowing effect of each soot blowing group. This disclosure does not impose specific limitations on this. In an exemplary embodiment, one second solenoid valve 21 can be opened each time along the flue gas flow direction, and the next second solenoid valve 21 can be opened after the previous second solenoid valve 21 has been closed for a certain period of time, so that the gas storage tank 5 can be replenished with sufficient soot blowing medium.

[0046] The soot blowing system for a boiler secondary air box provided in this disclosure, as an exemplary embodiment, refers to... Figure 1 and Figure 3 As shown, the gas storage tank 5 can be connected to the outside via the first drain valve 91, and the soot blowing header 1 can be connected to the outside via the second drain valve 92. In this way, after the soot blowing system for the boiler secondary air box has been in use for a period of time, the liquid in the gas storage tank 5 and the soot blowing header 1 can be discharged through the first drain valve 91 and the second drain valve 92, respectively.

[0047] In summary, when using the soot blowing system for boiler secondary air boxes provided in this disclosure, the first manual valve 81, the second manual valve 82, the third manual valve 83, and the first solenoid valve 84 are opened, and the first pressure gauge 61 is monitored. When the pressure of the soot blowing medium in the air tank 5 meets the requirements, one of the second solenoid valves 21 is opened, so that the soot blowing medium enters the first soot blowing pipe 41 and the second soot blowing pipe 42 from the air tank 5 through the soot blowing header pipe 1 and the corresponding connecting pipe 2. Finally, the first and second soot blowing components act on the dust in the air box 3, so that the dust can be suspended in the air box 3 and discharged from the air box 3 with the flue gas. After soot blowing is completed, the first pressure gauge 61 is monitored again. When the pressure of the soot blowing medium in the air tank 5 meets the requirements, another second solenoid valve 21 is opened to clean the dust at the next location.

[0048] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0049] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0050] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A soot blowing system for a boiler secondary air box, characterized in that, The soot blowing system for the boiler secondary air box includes: The soot blowing header is used to supply the soot blowing medium. At least one connecting pipe, wherein at least one connecting pipe is spaced apart along the length of the bellows, one end of the connecting pipe is connected to the soot blowing header, and the other end passes through the side wall of the bellows and extends into the bellows; and The soot blowing group is configured in a one-to-one correspondence with the number of connecting pipes. Each soot blowing group includes a first soot blowing pipe and a second soot blowing pipe. The first and second soot blowing pipes are respectively connected to the connecting pipes and extend along the length of the wind box. There are multiple first soot blowing pipes, which are spaced apart on the bottom wall of the wind box along the width of the wind box. The second soot blowing pipes are installed on the wind box and located on the side of the first soot blowing pipes away from the bottom wall of the wind box. Each soot blowing group includes a connecting pipe and two first soot blowing pipes. One end of one of the first soot blowing pipes is connected to the connecting pipe, and the other end is connected to the other first soot blowing pipe through the connecting pipe. The two first soot blowing pipes are installed on the bottom wall of the wind box and arranged opposite to each other. The second soot blowing pipe is installed on the top wall of the wind box and is equidistant from the two first soot blowing pipes. The first blowing pipe is connected to a plurality of first blowing elements, and the second blowing pipe is connected to a plurality of second blowing elements. The plurality of first blowing elements and the plurality of second blowing elements are arranged at intervals along the length of the bellows for blowing away the dust in the bellows. The first soot blowing component is constructed as a disc soot blower or a first wide-angle soot blower. The second soot blowing tube is connected to multiple acoustic soot blowers, and two second wide-angle soot blowers are arranged at intervals between any two adjacent acoustic soot blowers.

2. The soot blowing system for a boiler secondary air box according to claim 1, characterized in that, The distance between the second soot blowing pipe and the bottom wall of the air box is 0.4m to 0.6m.

3. The soot blowing system for a boiler secondary air box according to claim 1, characterized in that, Multiple first wide-angle soot blowers are provided on the side of the first soot blowing pipe away from the side wall of the air box, or, Multiple first wide-angle soot blowers are respectively arranged on both sides of the first soot blowing pipe.

4. The soot blowing system for a boiler secondary air box according to claim 1, characterized in that, Multiple disc-type soot blowers are provided on the side of the first soot blowing pipe away from the bottom wall of the air box.

5. The soot blowing system for a boiler secondary air box according to any one of claims 1-4, characterized in that, The distance between two adjacent connecting pipes is 3m to 5m.

6. The soot blowing system for a boiler secondary air box according to claim 5, characterized in that, The soot blowing system for the boiler secondary air box further includes an air storage tank, a first pressure gauge, and a second pressure gauge. The air inlet of the air storage tank is connected to the soot blowing medium source through an air inlet pipe, and the air outlet of the air storage tank is connected to the soot blowing main pipe. The first pressure gauge is used to detect the pressure of the air storage tank, and the second pressure gauge is used to detect the pressure inside the soot blowing main pipe.

7. The soot blowing system for a boiler secondary air box according to claim 6, characterized in that, The intake pipe is provided with a first manual valve and a second manual valve, which are arranged at intervals along the extension direction of the intake pipe.

8. The soot blowing system for a boiler secondary air box according to claim 5, characterized in that, The soot blowing main pipe is equipped with a third manual valve and a first solenoid valve, which are arranged at intervals along the extension direction of the soot blowing main pipe. Each connecting pipe is equipped with a second solenoid valve.

9. The soot blowing system for a boiler secondary air box according to claim 6, characterized in that, The gas storage tank is connected to the outside through a first drain valve, and the soot blowing main pipe is connected to the outside through a second drain valve.

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