Steam filter for wide load and high efficiency operation of heat supply unit

Abstract

The utility model provides a kind of steam filter for heat supply unit wide load high-efficiency operation, it is related to steam filter technical field, and it includes: flow cone cylinder and filter shell, the filter shell is welded on the outside conical surface of flow cone cylinder, tangent flow guide hole is set in the lower conical cylinder wall of flow cone cylinder, the inside of filter shell is inserted and is connected with primary filter screen cylinder and secondary filter screen cylinder, the conical inner chamber of flow cone cylinder is connected with the inside chamber of primary filter screen cylinder by tangent flow guide hole, the outside end of primary filter screen cylinder and secondary filter screen cylinder is respectively provided with inner backflush plate, outer backflush plate, the inside torus of inner backflush plate and outer backflush plate is equidistant and set with air outlet, the outside extension end of inner backflush plate and outer backflush plate is connected with electric push rod.The utility model solves the problem that filter pipe in prior art is directly impacted by high-speed steam when being subjected to load fluctuation, which can exacerbate the damage of filter screen surface and affect the service life of steam filter.

Description

Technical Field

[0001] This utility model relates to the field of steam filter technology, specifically to a steam filter for high-efficiency operation of heating units under wide loads. Background Technology

[0002] Wide-load, high-efficiency operation of heating units refers to the ability of the unit to maintain high thermal efficiency, stable operation, and flexible adjustment within a wide load range (such as 30% to 100% of rated load) when heating demand fluctuates significantly. This is crucial for balancing renewable energy fluctuations and improving energy utilization efficiency. In heating units, steam often carries impurities such as water droplets, rust, and welding slag during transportation. These impurities can erode downstream regulating valves, turbine blades, and heat exchange equipment, leading to equipment damage, reduced efficiency, and increased maintenance costs. To protect the equipment, steam filters are typically installed on steam pipelines. A search revealed existing technology (Publication No.: CN201921762928.8) for a superheated steam filter used for waste heat recovery from boiler continuous drainage. The document describes it as "mainly comprising a cylindrical shell with end caps at both ends, supported at the bottom by support feet. Along the steam inlet direction, the leftmost end of the shell is the inlet, and the end of the shell is perpendicular to the inlet direction with an outlet. A vertically oriented tube sheet is fixed inside the shell, and horizontally arranged filter tubes are installed on the tube sheet, fixed to the tube sheet by flanges. The filter tubes can be assembled in multiple sections for easy disassembly and cleaning." The filter tubes can be arranged in multiple layers with spacing, and each layer of filter tubes is supported and isolated by a bracket to prevent the filter tubes from shifting. To better filter suspended solids in the steam, the filter element of the filter tube adopts a multi-layer structure, namely, from the inside out, including a support layer, a precision filter layer, an outer protective layer, and a coarse filter layer. The support layer is made of porous metal mesh rolled into a cylinder, the precision filter layer is made of multiple layers of sintered metal mesh, the outer protective layer is made of square perforated mesh rolled into a cylinder, and the coarse filter layer is a single layer of metal filter mesh. The outermost layer of the filter tube is used for preliminary filtration of scale in the steam pipeline, and the precision filter layer is used to intercept finer particles in the steam. However, in existing technologies, when the filter tubes inside the filter are directly subjected to the impact of high-speed steam under fluctuating loads, the damage to the filter screen surface is easily aggravated, affecting the service life of the steam filter. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, a steam filter for wide-load, high-efficiency operation of heating units is provided. This addresses the problem in existing technologies where the filter tubes are directly subjected to high-speed steam impacts from load fluctuations, which easily exacerbates damage to the filter screen and affects the service life of the steam filter.

[0004] To achieve the above objectives, a steam filter for high-efficiency operation under wide load conditions is provided for heating units, comprising: a guide cone and a filter housing, wherein the filter housing is welded to the outer conical surface of the guide cone. The upper left side of the guide cone is connected to a steam pipeline via a steam inlet flange. A tangential guide hole is provided on the lower conical wall of the guide cone. A primary filter and a secondary filter are inserted into the inner side of the filter housing. The conical inner cavity of the guide cone is connected to the inner cavity of the primary filter through the tangential guide hole. An inner backflushing plate and an outer backflushing plate are respectively provided on the outer ends of the primary and secondary filter. Air outlet holes are provided at equal intervals on the inner circumferential surfaces of the inner and outer backflushing plates. An electric push rod is connected to the outer extension end of the inner and outer backflushing plates.

[0005] Furthermore, an ash discharge valve is installed at the ash outlet at the lower end of the guide cone, and a first discharge pipe and a second discharge pipe are connected to the ash outlet wall of the guide cone.

[0006] Furthermore, both the first and second discharge pipes are equipped with manual valves, and the upper openings of the first and second discharge pipes are connected to the discharge groove at the lower end of the filter housing.

[0007] Furthermore, a steam outlet is provided on the left side of the filter housing, the secondary filter screen is sleeved at the outer end of the primary filter screen, and a sealing cover is screwed to the upper end of the filter housing.

[0008] Furthermore, the sealing cover is pressed down on the upper surface of the primary filter cylinder and the secondary filter cylinder, and both the filter housing and the sealing cover are provided with pipe connection ports.

[0009] Furthermore, one end of the pipe connection port is connected to an air pipe; and the other end can be connected to a high-pressure air supply pipe. A control unit is provided on the side of the lower support of the filter housing.

[0010] Furthermore, the inner and outer backflush plates are provided with air guide chambers, and the air outlet is connected to the air pipe through the air guide chambers.

[0011] The beneficial effects of this utility model are as follows: the steam filter for high-efficiency operation of the heating unit under wide loads utilizes a guide cone placed before the air inlet of the filter. The steam first undergoes centrifugal rotation along the conical cavity inside the guide cone, separating large droplets and large particulate impurities in the steam. The initially separated steam is evenly dispersed into the filter through multiple sets of tangential guide holes on the cone wall, which facilitates the fluctuation of steam flow rate under stable wide load conditions. This effectively allows large particulate impurities in the steam to directly impact the filter screen, reducing impact damage to the steam filter, extending the service life of the steam filter under high-efficiency operation of the heating unit under wide loads, and improving the filtration efficiency of the steam filter. Attached Figure Description

[0012] Figure 1 This is a front view structural diagram of the steam filter for wide-load, high-efficiency operation of a heating unit according to an embodiment of the present invention.

[0013] Figure 2 This is a front cross-sectional view of the steam filter for wide-load, high-efficiency operation of a heating unit according to an embodiment of the present invention.

[0014] Figure 3 This is a cross-sectional structural diagram of the guide cone according to an embodiment of the present invention.

[0015] Figure 4 This is a cross-sectional structural diagram of the filter housing according to an embodiment of the present invention.

[0016] Figure 5 This is a partial cross-sectional structural diagram of the filter housing according to an embodiment of the present invention.

[0017] In the diagram: 1. Guide cone; 11. Ash discharge valve; 12. Steam inlet pipe; 13. Tangential guide hole; 2. Filter housing; 21. Steam outlet; 22. Primary filter screen; 23. Secondary filter screen; 24. Sealing cover; 25. Pipe connection port; 3. Steam pipeline; 4. Waste discharge pipe one; 41. Waste discharge pipe two; 42. Manual valve; 5. Control unit; 6. Inner backflush plate; 61. Outer backflush plate; 62. Air guide chamber; 63. Electric push rod; 64. Air pipe; 65. Air outlet. Detailed Implementation

[0018] Reference Figures 1 to 5 As shown, this utility model provides a steam filter for high-efficiency operation of a heating unit under wide load conditions, comprising: a guide cone 1 and a filter housing 2, wherein the filter housing 2 is welded to the outer conical surface of the guide cone 1. The upper left side of the guide cone 1 is connected to a steam pipe 3 via a flange of the steam inlet pipe 12. A tangential guide hole 13 is provided on the lower conical wall of the guide cone 1. A primary filter cylinder 22 and a secondary filter cylinder 23 are inserted into the inner side of the filter housing 2. The conical inner cavity of the guide cone 1 is connected to the inner cavity of the primary filter cylinder 22 via the tangential guide hole 13. An inner backflushing plate 6 and an outer backflushing plate 61 are respectively provided on the outer ends of the primary filter cylinder 22 and the secondary filter cylinder 23. Air outlet holes 65 are provided at equal intervals on the inner circumferential surfaces of the inner backflushing plate 6 and the outer backflushing plate 61. An electric push rod 63 is connected to the outer extension end of the inner backflushing plate 6 and the outer backflushing plate 61.

[0019] Steam generated by the heating unit during high-efficiency operation under wide load flows through steam pipeline 3 to guide cone 1. The steam first enters the conical cavity inside guide cone 1 through steam inlet pipe 12 and forms a centrifugal rotational flow along the conical cavity. During the rotation, large droplets and large particulate impurities in the steam are thrown towards the cone wall and collect downwards under the action of centrifugal force, achieving preliminary separation. The steam after preliminary separation enters the inner chamber of the primary filter cylinder 22 inside the filter housing 2 evenly and dispersedly through multiple sets of tangential guide holes 13 evenly opened on the cone wall. After being filtered by the primary filter cylinder 22 and the secondary filter cylinder 23, it is discharged from the steam outlet 21 into the filter housing 2. This facilitates the contact of steam with the filter screen at a relatively uniform flow rate under wide load operation, avoiding the direct high-speed impact of steam carrying large particulate impurities on the filter screen, effectively reducing the impact damage to the filter screen, extending the service life of the steam filter under high-efficiency operation of the heating unit under wide load, and improving the filtration efficiency of the steam filter.

[0020] In this embodiment, an ash discharge valve 11 is installed at the ash outlet at the lower end of the guide cone 1, and a first discharge pipe 4 and a second discharge pipe 41 are connected to the wall of the ash outlet end of the guide cone 1. A manual valve 42 is installed on the pipe surface of both the first discharge pipe 4 and the second discharge pipe 41, and the upper pipe openings of the first discharge pipe 4 and the second discharge pipe 41 are connected to the discharge groove at the lower end of the filter housing 2.

[0021] As a preferred embodiment, the ash discharge valve 11 facilitates the removal of impurities separated by filtration from the filter assembly. The first and second discharge pipes 41 are used to filter the primary filter cylinder 22 and the secondary filter cylinder 23, allowing them to slide down to the ash outlet of the guide cone 1, thus facilitating the convenient discharge of impurities from the filter housing 2.

[0022] In this embodiment, a steam outlet 21 is provided on the left side of the filter housing 2, and a secondary filter cylinder 23 is sleeved on the outer end of the primary filter cylinder 22. A sealing cover plate 24 is screwed and fixed to the upper end of the filter housing 2. The sealing cover plate 24 is pressed down on the upper cylinder surfaces of the primary filter cylinder 22 and the secondary filter cylinder 23. Both the filter housing 2 and the sealing cover plate 24 are provided with pipe connection ports 25.

[0023] In a preferred embodiment, steam outlet 21 discharges the multi-stage filtered steam from the steam filtration equipment into the next processing step. The primary filter cartridge 22 and the secondary filter cartridge 23 form a two-stage filtration system, which, combined with the primary separation by the guide cone 1, achieves highly efficient steam filtration and separation. The sealing cover 24 on the filter housing 2 is removable, allowing easy removal of the primary and secondary filter cartridges 22 and 23 for regular cleaning or replacement.

[0024] In this embodiment, one end of the pipe connection port 25 is connected to the air pipe 64; and the other end can be connected to a high-pressure air supply pipe. A control unit 5 is provided on the side of the lower support of the filter housing 2. The inner backflushing plate 6 and the outer backflushing plate 61 are provided with air guiding chambers 62, and the air outlet 65 is connected to the air pipe 64 through the air guiding chambers 62.

[0025] In a preferred embodiment, the inner backwash plate 6 and the outer backwash plate 61 are used to backwash the mesh surfaces of the primary filter cylinder 22 and the secondary filter cylinder 23. High-pressure airflow is delivered to the air outlets 65 of the inner and outer backwash plates 6 and ejected through a high-pressure air supply pipe connected to the pipe connection port 25. Simultaneously, the electric push rod 63 pushes the inner and outer backwash plates 6 and 61 to move up and down, facilitating automatic cleaning of the primary and secondary filter cylinders 22 and 23, reducing clogging, and ensuring normal operation of the steam filtration process. The control unit 5 is used to control the operation of the electrical equipment in the backwashing mechanism.

[0026] This utility model of a steam filter for high-efficiency operation of heating units under wide loads effectively solves the problem in existing technologies where the filter tubes inside the filter are directly impacted by high-speed steam under load fluctuations, which easily aggravates the damage to the filter screen and affects the service life of the steam filter. It facilitates the fluctuation of steam flow rate under stable wide load conditions, effectively allowing large particles of impurities in the steam to directly impact the filter screen, reducing impact damage to the steam filter, extending the service life of the steam filter under high-efficiency operation of the heating unit under wide loads, and improving the filtration efficiency of the steam filter. It is suitable for steam filters for high-efficiency operation of heating units under wide loads.

Claims

1. A steam filter for wide-load, high-efficiency operation of a heating unit, comprising: A flow guide cone (1) and a filter housing (2), wherein the flow guide cone (1) is welded to the outer conical surface of the filter housing (2), characterized in that: The upper left side of the guide cone (1) is connected to a steam pipe (3) through a steam inlet pipe (12) flange. The lower conical wall of the guide cone (1) is provided with a tangential guide hole (13). A primary filter cylinder (22) and a secondary filter cylinder (23) are inserted into the inner side of the filter housing (2). The conical inner cavity of the guide cone (1) is connected to the inner cavity of the primary filter cylinder (22) through the tangential guide hole (13). The outer ends of the primary filter cylinder (22) and the secondary filter cylinder (23) are respectively provided with an inner backflushing plate (6) and an outer backflushing plate (61). The inner ring surfaces of the inner backflushing plate (6) and the outer backflushing plate (61) are provided with air outlet holes (65) at equal intervals. The outer extension ends of the inner backflushing plate (6) and the outer backflushing plate (61) are connected with an electric push rod (63).

2. The steam filter for wide-load, high-efficiency operation of a heating unit according to claim 1, characterized in that, A ash discharge valve (11) is installed at the ash outlet at the lower end of the guide cone (1), and a first discharge pipe (4) and a second discharge pipe (41) are connected to the ash outlet wall of the guide cone (1).

3. A steam filter for wide-load, high-efficiency operation of a heating unit according to claim 2, characterized in that, Manual valves (42) are installed on the pipe surfaces of the first discharge pipe (4) and the second discharge pipe (41). The upper openings of the first discharge pipe (4) and the second discharge pipe (41) are connected to the discharge groove at the lower end of the filter housing (2).

4. A steam filter for wide-load, high-efficiency operation of a heating unit according to claim 1, characterized in that, The filter housing (2) has a steam outlet (21) on its left side. The secondary filter cylinder (23) is sleeved at the outer end of the primary filter cylinder (22). A sealing cover plate (24) is screwed to the upper end of the filter housing (2).

5. A steam filter for wide-load, high-efficiency operation of a heating unit according to claim 4, characterized in that, The sealing cover (24) is pressed down on the upper surface of the primary filter cylinder (22) and the secondary filter cylinder (23). Both the filter housing (2) and the sealing cover (24) are provided with pipe connection ports (25).

6. A steam filter for wide-load, high-efficiency operation of a heating unit according to claim 5, characterized in that, One end of the pipe connection port (25) is connected to a gas pipe (64); and the other end can be connected to a high-pressure gas transmission pipe. A control unit (5) is provided on the side of the lower support of the filter housing (2).

7. A steam filter for wide-load, high-efficiency operation of a heating unit according to claim 1, characterized in that, The inner backflush plate (6) and the outer backflush plate (61) are provided with air guide chambers (62), and the air outlet (65) is connected to the air pipe (64) through the air guide chambers (62).

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