Coal-fired boiler structure with denitration assembly

Abstract

The utility model discloses a coal-fired boiler structure with a denitration assembly, and relates to the technical field of coal-fired boilers. The coal-fired boiler structure with the denitration assembly comprises a coal-fired boiler body, an ash filtering assembly used for removing fly ash in flue gas is installed at the gas outlet end of the coal-fired boiler body, a gas pump is installed at the end, away from the coal-fired boiler body, of the ash filtering assembly, a denitration device is installed at the end, away from the ash filtering assembly, of the gas pump, and a gas outlet pipe is fixed to the gas outlet end of the denitration device; the ash filtering assembly can effectively remove fly ash in smoke, reduce emission of atmospheric pollutants and improve air quality, the cleaning structure and the vibration assembly on the ash filtering assembly can automatically and regularly clean the filter screen, the filter screen is effectively prevented from being blocked, the good filtering performance of the filter screen is kept, and therefore the operation efficiency of the whole coal-fired boiler is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal-fired boilers, in particular to a coal-fired boiler structure with a denitration component. Background Art

[0002] Coal-fired boilers with denitrification components are equipment that adds denitrification devices to traditional coal-fired boilers to remove nitrogen oxides from flue gas, thereby reducing environmental pollution. With the continuous improvement of the country's environmental protection requirements and the continuous development of coal-fired boiler technology, coal-fired boilers with denitrification components will become the mainstream trend in the future.

[0003] The patent with authorization publication number CN213089800U discloses a new type of coal-fired boiler suitable for off-furnace denitrification, including a base, a coal-fired boiler body is provided at the top of the base, convection tube bundles are provided on both sides of the boiler, a boiler drum is fixedly provided at the top of the coal-fired boiler body, a threaded flue pipe is provided on the inner wall of the boiler drum, a high-temperature flue gas outlet is opened at the top of one end of the coal-fired boiler body, a low-temperature flue gas outlet is opened at the top of the other end of the coal-fired boiler body, a high-temperature flue gas mixing pipe is fixedly provided at one end of the low-temperature flue gas outlet, and an air inlet pipe is provided at the top of the high-temperature flue gas mixing pipe. In this utility model, high-temperature flue gas and low-temperature flue gas enter the high-temperature flue gas mixing pipe. After the high-temperature flue gas and the low-temperature flue gas are fully mixed, the flue temperature is about 280-420°C, and then enter the denitrification device for denitrification treatment to reduce the nitrogen oxide content. The flue gas temperature of the coal-fired boiler body is controlled at about 280-420°C, which is suitable for medium-temperature denitrification and helps to reduce the denitrification cost.

[0004] As shown in the above-mentioned prior art, a coal-fired boiler with a denitrification component in the prior art will generate a large amount of flue gas and fly ash when in use. The denitrification component is used to remove nitrogen oxides in the flue gas, and a filter component is used in some denitrification components to filter the fly ash in the flue gas, which has achieved the purpose of reducing environmental pollution and better meeting the country's environmental protection requirements; however, the filter component in the prior art often has cumbersome steps when cleaning the filter screen, and the operation is inconvenient.

[0005] Therefore, it is necessary to provide a coal-fired boiler structure with a denitrification component to solve the above technical problems. Utility Model Content

[0006] (1) Technical problems solved

[0007] In order to solve the above technical problems, the utility model provides a coal-fired boiler structure with a denitrification component.

[0008] (2) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions: a coal-fired boiler structure with a denitrification component, comprising a coal-fired boiler body, an ash filter component for removing fly ash from flue gas installed at the gas outlet end of the coal-fired boiler body, an air pump installed at the end of the ash filter component away from the coal-fired boiler body, a denitrification device installed at the end of the air pump away from the ash filter component, and an outlet pipe fixed to the gas outlet end of the denitrification device;

[0010] The coal-fired boiler body, ash filter assembly, air pump and denitrification device are all connected in series through pipelines;

[0011] The ash filter assembly is provided with a filter screen, and the ash filter assembly is provided with a cleaning structure for automatically cleaning the filter screen.

[0012] Preferably, the ash filter assembly includes a shell having two ends connected to the air outlet of the coal-fired boiler body and the air inlet of the air pump respectively, a mounting frame is slidably connected to the inner wall of the shell, the filter screen is fixed to the inner wall of the mounting frame, a lifting assembly is installed on the top of the shell to enable the mounting frame to slide and rise in the shell, and a vibration assembly is installed inside the shell to vibrate the mounting frame when it is lifted and lowered, thereby causing the fly ash to fall;

[0013] A dust collecting box is slidably connected to the lower part of the shell, and an opening and closing structure is installed under the installation frame. The opening and closing structure is used to control the communication state between the shell and the dust collecting box when the installation frame is raised or lowered.

[0014] Preferably, the lifting assembly includes an electric push rod fixed to the top of the shell, the output end of the electric push rod passes through the shell and is fixed to the top of the installation frame, and a sliding rod is symmetrically fixed to the top of the installation frame, and the sliding rod is slidably connected to the top of the shell.

[0015] Preferably, the vibration assembly includes two shells fixed inside the shell near the side of the air pump, the inner walls of the two shells are slidably connected with short columns, the end of the short columns close to the mounting frame is hemispherical, and the ends of the two shells away from the mounting frame are fixed with springs, the ends of the springs away from the shells are fixed to the ends of the short columns away from the mounting frame, and a number of hemispherical protrusions are symmetrically and evenly fixed on one side of the mounting frame close to the short columns, and the short columns are movably connected to the hemispherical protrusions.

[0016] Preferably, the opening and closing structure includes a blocking plate fixed to the bottom of the mounting frame, and the blocking plate covers the through hole communicating with the shell and the dust box.

[0017] Preferably, a slide bar is symmetrically fixed below the shell, and two slide grooves are provided on the top of the dust box corresponding to the slide bar, and the slide grooves are slidably connected to the slide bar.

[0018] (3) Beneficial effects

[0019] The utility model provides a coal-fired boiler structure with a denitrification component. Compared with the existing technology, it has the following advantages:

[0020] 1. The ash filter assembly can effectively remove fly ash from flue gas, reduce the emission of atmospheric pollutants, and improve air quality. The cleaning structure and vibration assembly on the ash filter assembly can automatically clean the filter regularly, effectively preventing the filter from clogging and maintaining its good filtering performance, thereby improving the operating efficiency of the entire coal-fired boiler;

[0021] 2. The sliding connection design between the dust box and the shell makes the collection and treatment of fly ash easier, reducing the complexity of manual operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the relationship between the slide bar and the slide groove of the present utility model;

[0024] Figure 3 This is a schematic diagram of the relationship between the installation frame and the partition assembly of the present utility model.

[0025] Numbers in the figure: 1. Coal-fired boiler body; 2. Air pump; 3. Filter; 4. Shell; 5. Mounting frame; 6. Dust box; 7. Electric push rod; 8. Slide rod; 9. Sleeve; 10. Short column; 11. Spring; 12. Hemispherical bump; 13. Blocking plate; 14. Slide bar; 15. Slide chute; 16. Denitrification device. DETAILED DESCRIPTION

[0026] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0027] This utility model provides two technical solutions:

[0028] Figures 1 to 3 The first embodiment is shown: a coal-fired boiler structure with a denitrification assembly, comprising a coal-fired boiler body 1, an ash filter assembly for removing fly ash from flue gas installed at the outlet end of the coal-fired boiler body 1, an air pump 2 installed at the end of the ash filter assembly away from the coal-fired boiler body 1, a denitrification device 16 installed at the end of the air pump 2 away from the ash filter assembly, and an outlet pipe fixed to the outlet end of the denitrification device 16;

[0029] The coal-fired boiler body 1, the ash filter assembly, the air pump 2 and the denitrification device 16 are all connected in series through pipelines;

[0030] A filter screen 3 is installed on the ash filter assembly, and a cleaning structure for automatically cleaning the filter screen 3 is installed on the ash filter assembly.

[0031] The ash filter assembly includes a shell 4 whose two ends are respectively connected to the air outlet end of the coal-fired boiler body 1 and the air inlet end of the air pump 2. The inner wall of the shell 4 is slidably connected to the mounting frame 5. The filter 3 is fixed to the inner wall of the mounting frame 5. A lifting assembly is installed on the top of the shell 4 to enable the mounting frame 5 to slide and rise within the shell 4. A vibration assembly is installed inside the shell 4 to vibrate the mounting frame 5 when it is lifted and lowered, thereby causing the fly ash to fall.

[0032] A dust box 6 is slidably connected to the bottom of the shell 4, and an opening and closing structure is installed under the installation frame 5. The opening and closing structure is used to control the communication state between the shell 4 and the dust box 6 when the installation frame 5 is raised or lowered.

[0033] The lifting assembly includes an electric push rod 7 fixed to the top of the shell 4. The output end of the electric push rod 7 passes through the shell 4 and is fixed to the top of the installation frame 5. A slide rod 8 is symmetrically fixed to the top of the installation frame 5. The slide rod 8 is slidably connected to the top of the shell 4.

[0034] The vibration assembly includes two sleeves 9 fixed inside the shell 4 near the side of the air pump 2. The inner walls of the two sleeves 9 are slidably connected with short columns 10. The end of the short column 10 close to the mounting frame 5 is hemispherical. The ends of the two sleeves 9 away from the mounting frame 5 are fixed with springs 11. The end of the spring 11 away from the sleeve 9 is fixed to the end of the short column 10 away from the mounting frame 5. Several hemispherical protrusions 12 are symmetrically and evenly fixed on one side of the mounting frame 5 close to the short column 10. The short column 10 is movably connected to the hemispherical protrusion 12.

[0035] The opening and closing structure includes a blocking plate 13 fixed to the bottom of the mounting frame 5 , and the blocking plate 13 covers the through hole communicating between the housing 4 and the dust box 6 .

[0036] The ash filter assembly can effectively remove fly ash from the flue gas, reduce the emission of atmospheric pollutants, and improve the air quality. The cleaning structure and vibration assembly on the ash filter assembly can regularly clean the filter 3, effectively preventing the filter 3 from being blocked and maintaining its good filtering performance, thereby improving the operating efficiency of the entire coal-fired boiler.

[0037] Figure 2 A second embodiment is shown, which mainly differs from the first embodiment in that a slide bar 14 is symmetrically fixed below the shell 4 , and two slide grooves 15 are provided on the top of the dust box 6 corresponding to the slide bar 14 , and the slide grooves 15 are slidably connected to the slide bar 14 .

[0038] The sliding connection design between the dust box 6 and the housing 4 makes the collection and treatment of fly ash easier and reduces the complexity of manual operation and maintenance costs.

[0039] Working principle:

[0040] Coal-fired boilers generate heat by burning coal, which is transferred to a medium (such as water or steam) through a heat exchanger to achieve heating or other industrial uses. During the combustion process, the coal goes through four stages: drying, preheating, gasification, and combustion, ultimately producing flue gas containing harmful substances such as fly ash, sulfur dioxide, and nitrogen oxides. This is existing technology and will not be elaborated on here.

[0041] The denitrification device 16 uses appropriate technology (such as oxidation method, SCR method, etc.) to remove nitrogen oxides in the flue gas; in the oxidation method, the nitrogen oxides in the flue gas are oxidized by an oxidant into substances that are easier to handle; and in the SCR method, ammonia and other reducing agents react with nitrogen oxides to generate harmless substances such as nitrogen and water vapor. This is an existing technology and is not described in detail.

[0042] The flue gas generated by the coal-fired boiler body 1 first enters the shell 4, and the fly ash in the flue gas is filtered by the filter 3. The filtered flue gas is sucked into the air pump 2 and transported to the denitrification device 16 through a pipeline for denitrification treatment. The denitrification device 16 then discharges the treated flue gas through the outlet pipe.

[0043] When the filter screen 3 is cleaned, the mounting frame 5 is lifted and lowered, and the filter screen 3 is cleaned. When the filter screen 3 is cleaned, the mounting frame 5 is lifted and lowered, and the filter screen 3 is cleaned. When the filter screen 3 is cleaned, the mounting frame 5 is returned to its original position, and the blocking plate blocks the through hole of the dust collecting box 6 and the housing 4, closing the connection state.

[0044] The dust box 6 can be removed by moving the dust box 6 along the length direction of the slide bar 14 to clean the fly ash collected in the dust box 6.

[0045] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0046] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0047] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coal-fired boiler structure with a denitrification component, comprising a coal-fired boiler body (1), characterized in that: An ash filter assembly for removing fly ash from flue gas is installed at the gas outlet end of the coal-fired boiler body (1); an air pump (2) is installed at one end of the ash filter assembly away from the coal-fired boiler body (1); a denitrification device (16) is installed at one end of the air pump (2) away from the ash filter assembly; and an outlet pipe is fixed to the gas outlet end of the denitrification device (16); The coal-fired boiler body (1), the ash filter assembly, the air pump (2) and the denitrification device (16) are all connected in series via pipelines; A filter screen (3) is installed on the ash filter assembly, and a cleaning structure for automatically cleaning the filter screen (3) is installed on the ash filter assembly.

2. A coal-fired boiler structure with a denitrification component according to claim 1, characterized in that: The ash filter assembly comprises a shell (4) whose two ends are respectively connected to the air outlet of the coal-fired boiler body (1) and the air inlet of the air pump (2); the inner wall of the shell (4) is slidably connected to a mounting frame (5); the filter screen (3) is fixed to the inner wall of the mounting frame (5); a lifting assembly is installed on the top of the shell (4) to enable the mounting frame (5) to slide and rise in the shell (4); and a vibration assembly is installed inside the shell (4) to cause the mounting frame (5) to vibrate when the mounting frame (5) rises and falls, thereby causing the fly ash to fall; A dust box (6) is slidably connected below the shell (4), and an opening and closing structure is installed below the installation frame (5). The opening and closing structure is used to control the connection state between the shell (4) and the dust box (6) when the installation frame (5) is raised or lowered.

3. A coal-fired boiler structure with a denitrification component according to claim 2, characterized in that: The lifting assembly comprises an electric push rod (7) fixed on the top of the housing (4); the output end of the electric push rod (7) passes through the housing (4) and is fixed to the top of the mounting frame (5); a sliding rod (8) is symmetrically fixed on the top of the mounting frame (5); and the sliding rod (8) is slidably connected to the top of the housing (4).

4. The coal-fired boiler structure with a denitrification component according to claim 2, characterized in that: The vibration assembly comprises two sleeves (9) fixed inside the housing (4) on one side close to the air pump (2), the inner walls of the two sleeves (9) are slidably connected with short columns (10), the ends of the short columns (10) close to the mounting frame (5) are hemispherical, the ends of the two sleeves (9) away from the mounting frame (5) are fixed with springs (11), the ends of the springs (11) away from the sleeves (9) are fixed to the ends of the short columns (10) away from the mounting frame (5), and a plurality of hemispherical protrusions (12) are symmetrically and evenly fixed on one side of the mounting frame (5) close to the short columns (10), and the short columns (10) are movably connected to the hemispherical protrusions (12).

5. The coal-fired boiler structure with a denitrification component according to claim 2, characterized in that: The opening and closing structure comprises a blocking plate (13) fixed to the bottom of the mounting frame (5), and the blocking plate (13) covers a through hole communicating between the housing (4) and the dust collecting box (6).

6. The coal-fired boiler structure with a denitrification component according to claim 3, characterized in that: A slide bar (14) is symmetrically fixed below the shell (4), and two slide grooves (15) are provided on the top of the dust collecting box (6) corresponding to the slide bar (14), and the slide grooves (15) are slidably connected to the slide bar (14).

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