Dry dedusting converter gas waste heat boiler with water-cooled supporting frame

Abstract

The utility model provides a dry dedusting converter gas waste heat boiler with a water-cooled support frame, which comprises a cylinder body, a heat exchange energy plate and the water-cooled support frame, the heat exchange energy plate is arranged in the cylinder body, extends from the inner wall of the cylinder body to the inner space and is placed in a vertical wall shape, and the water-cooled support frame is arranged in the cylinder body. The water-cooled supporting frame is arranged below the heat exchange energy plate and used for supporting the heat exchange energy plate, the water-cooled supporting frame comprises water-cooled heat exchange pipes, and the water-cooled heat exchange pipes are horizontally distributed below the heat exchange energy plate and make contact with the bottom of the heat exchange energy plate. According to the waste heat boiler, the water-cooled supporting frame is arranged below the heat exchange plate, the frame cannot generate thermal stress fatigue, and the structural stability of the whole waste heat boiler is protected.

Description

Technical Field

[0001] The utility model belongs to the technical field of converter gas waste heat recovery, and particularly relates to a dry dust removal converter gas waste heat boiler with a water-cooled support frame. Background Art

[0002] The converter gas (sometimes called converter flue gas) at 1600℃ from the steelmaking converter contains more than 70% of the combustible component CO and the rest is CO. 2 , O 2 , so it is also called converter gas. It also contains a lot of dust, which contains more usable components such as iron and magnesium, and needs to be recycled) first enters the vaporization cooling flue waste heat boiler and cools down to 900-1000℃. The dust in this temperature range is soft and has less abrasiveness to the metal wall. At present, the use of vaporization cooling flue waste heat boiler is more common, and almost every converter is equipped with it. The characteristics of converter gas: high temperature, high dust content, magnetism, abrasiveness, static electricity, intermittent, periodic, flammable, and extremely harsh conditions.

[0003] The converter gas at 900-1000℃ has a great wear on the metal wall surface because the dust becomes hard. The current situation is that after entering the evaporative cooler, cold water is directly sprayed into the converter gas to cool it down to ~200℃ before dust removal and purification. Therefore, there is a huge waste of energy, and it is extremely important to recover the high-grade heat. In the patents previously applied for by the applicant, energy plates placed on the vertical wall surface are set in the evaporative cooler, which can effectively recover high-grade heat, but there are also some problems, such as the small number of heat exchange surfaces arranged in a radial shape, and due to the high temperature, the support structure of the waste heat boiler will produce thermal stress fatigue, resulting in deformation, making the boiler structure unstable, etc. Utility Model Content

[0004] Technical problem: In order to solve the defects of the prior art, the utility model provides a dry dust removal converter gas waste heat boiler with a water-cooled support frame.

[0005] Technical solution: To solve the above technical problems, the utility model provides the following technical solutions:

[0006] A dry dust removal converter gas waste heat boiler with a water-cooled support frame comprises a cylinder, a heat exchange energy plate and a water-cooled support frame, wherein the heat exchange energy plate is arranged at the upper part of the cylinder, extends from the inner wall of the cylinder to the internal space and is placed in a vertical wall shape, the water-cooled support frame is arranged below the heat exchange energy plate and is used to support the heat exchange energy plate, the water-cooled support frame comprises water-cooled heat exchange pipes, which are horizontally distributed below the heat exchange energy plate and contact with the bottom of the heat exchange energy plate.

[0007] As a specific implementation scheme, both end openings of the water-cooled heat exchange tube pass through the cylinder wall, one end opening is connected to the cold water inlet header of the water-cooled beam outside the cylinder, and the other end opening is connected to the hot water outlet header of the water-cooled beam outside the cylinder.

[0008] As a preferred solution, a plurality of water-cooled heat exchange tubes are arranged in parallel.

[0009] As a preferred solution, the surface of the water-cooled heat exchange tube located inside the cylinder is covered with an anti-wear sleeve.

[0010] As a specific implementation scheme, the water-cooled support frame also includes a bottom support beam, the two ends of the bottom support beam are fixed to the cylinder and are horizontally arranged, the water-cooled heat exchange tube is arranged on the bottom support beam, and the bottom support beam is used to fix and support the water-cooled heat exchange tube; as a preferred solution, a plurality of bottom support beams are arranged in parallel, and are all perpendicular to the water-cooled heat exchange tube.

[0011] As a specific implementation scheme, the heat exchange energy plate is mainly composed of an energy plate heat exchange tube and a guard plate. The energy plate heat exchange tube is distributed inside the guard plate in a vertical serpentine state, and its two ends are connected to the outside through the guard plate and the cylinder in sequence. The guard plate can protect the heat exchange tube from being worn by the converter gas.

[0012] Furthermore, the heat exchange energy plates are symmetrically distributed on both sides of any longitudinal section passing through the central axis in the cylinder, and the energy plates on the same side are placed parallel to each other; preferably, the heat exchange energy plates are set to different widths and placed in sequence; the heat exchange tubes in each energy plate have their water inlets connected to the water inlet header outside the cylinder, and their water outlets connected to the water outlet header outside the cylinder. The water inlet is located at the bottom of the heat exchange energy plate, and the water outlet is set at the top of the heat exchange energy plate.

[0013] Furthermore, the water inlet end of the energy plate heat exchange tube is fixedly connected to the cylinder wall, and the water outlet end is connected to the cylinder wall via an expansion joint to ensure different expansion amounts in the height direction of the cylinder wall and the energy plate.

[0014] As a further improvement, the surface of the energy plate heat exchange tube is also provided with H-shaped straight fins, which pass through the guard plate and are exposed. This design can absorb the heat released by the converter gas and improve the heat exchange efficiency.

[0015] As a specific implementation scheme, the converter gas waste heat boiler also includes a gas inlet arranged at the top of the cylinder and a gas outlet arranged at the bottom, and the heat exchange energy plate is arranged in the upper area inside the cylinder, below the gas inlet, and is placed in a vertical wall shape.

[0016] The "vertical wall shape" mentioned in the present invention refers to that the heat exchange energy plate is placed vertically in the tower body, and its side surfaces are perpendicular to the horizontal plane, so it is called a "vertical wall".

[0017] Beneficial effects: Compared with the prior art, the waste heat boiler of the utility model is provided with a water-cooled support frame under the heat exchange energy plate, and the frame will not produce thermal stress fatigue, which plays a protective role in the structural stability of the entire waste heat boiler. This technology can recover waste heat from the high-temperature section gas in the converter gas boiler, can produce high-quality medium and high-pressure saturated steam, reduce the amount of water sprayed, reduce the gas working volume flow at the boiler outlet, and reduce the subsequent processing cost of the converter gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the waste heat boiler of the utility model.

[0019] Figure 2 It is a schematic diagram of the arrangement of the heat exchange energy plates and the water-cooled support frame in the waste heat boiler of the utility model (a top view of the energy plate arrangement).

[0020] Figure 3 It is a schematic diagram of the internal structure of the heat exchange energy plate in the waste heat boiler of the utility model.

[0021] Figure 4 It is an external stereoscopic diagram of the heat exchange plate in the waste heat boiler of the utility model (with a straight fin structure).

[0022] Figure 5 This is a diagram showing the connection between the water outlet end of the energy plate heat exchange tube and the cylinder wall of the waste heat boiler of the utility model.

[0023] Figure 6 It is a schematic diagram of the arrangement of the heat exchange plates in the waste heat boiler of the utility model (1 / 4 of the horizontal cross section of the cylinder). DETAILED DESCRIPTION

[0024] The utility model device is further described below in conjunction with the accompanying drawings.

[0025] In the description of the present utility model, it should be understood that if the terms "upper", "lower", "left", "right", "top", "bottom", "inside", "outside", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent.

[0026] Example 1

[0027] A dry dust removal converter gas waste heat boiler with a water-cooled support frame, such as Figure 1As shown, it includes a cylinder 1, a heat exchange energy plate 2 and a water-cooled support frame 3. The heat exchange energy plate 2 is arranged inside the cylinder 1, extending from the inner wall of the cylinder 1 to the internal space and placed in a vertical wall shape. The water-cooled support frame 3 is arranged below the heat exchange energy plate 2 and is used to support the heat exchange energy plate 2. The water-cooled support frame 3 includes a water-cooled heat exchange tube 31, which is horizontally distributed below the heat exchange energy plate 2 and contacts the bottom of the heat exchange energy plate 2. The water-cooled support frame 3 also includes a bottom support beam 34, both ends of which are fixed to the cylinder 1 and arranged horizontally, and the water-cooled heat exchange tube 31 is arranged on the bottom support beam 34, and the bottom support beam 34 is used to fix and support the water-cooled heat exchange tube 31; a plurality of bottom support beams 34 are arranged in parallel, and all are perpendicular to the water-cooled heat exchange tube 31.

[0028] like Figure 2 As shown, both ends of the water-cooled heat exchange tube 31 pass through the wall of the cylinder 1, and a plurality of them are arranged in parallel, one end opening of all the heat exchange tubes is connected to the cold water inlet header 32 of the water-cooled beam outside the cylinder 1, and the other end opening is connected to the hot water outlet header 33 of the water-cooled beam outside the cylinder 1. The part of the water-cooled heat exchange tube 31 located inside the cylinder 1 is covered with an anti-wear sleeve on the surface of the tube body to protect it from the wear of the converter gas.

[0029] The waste heat boiler also includes a gas inlet at the top of the cylinder 1 and a gas outlet at the bottom. The heat exchange energy plate 2 is arranged in the upper area inside the cylinder 1, below the gas inlet, and is placed in a vertical wall shape. The boiler also includes a cooling device 4 arranged inside the cylinder 1. The cooling device 4 is specifically a spray device for spraying cold water below it. Above the heat exchange energy plate 2, a soot blower 5 is also arranged on the top of the cylinder 1. A plurality of soot blowers 5 are evenly designed on the cross section of the cylinder 1.

[0030] like Figure 3 As shown, the heat exchange plate 2 is mainly composed of a plate heat exchange tube 21 and a guard plate 22. The plate heat exchange tube 21 is distributed inside the guard plate 22 in a vertical serpentine state, and its two ends are opened through the guard plate 22 and the cylinder 1 in turn to communicate with the outside. Figure 4 As shown, as an improvement, the surface of the energy plate heat exchange tube 21 is also provided with H-shaped straight fins 24, which pass through the guard plate 22 and are exposed to absorb the heat released by the converter gas to improve the heat exchange efficiency. The water inlet end of the energy plate heat exchange tube 21 is fixedly connected to the wall of the cylinder 1, such as Figure 5 As shown, the water outlet end is connected to the cylinder wall of the cylinder 1 through an expansion joint 23 to ensure different expansion amounts in the height direction of the cylinder wall and the energy plate.

[0031] like Figure 6As shown, the heat exchange energy plates 2 are symmetrically distributed on both sides of any longitudinal section passing through the central axis in the cylinder 1, and the energy plates on the same side are placed parallel to each other; further, the heat exchange energy plates 2 are set to different widths and placed in sequence; the energy plate heat exchange tubes 21 in each energy plate have their water inlets connected to the water inlet header outside the cylinder 1, and their water outlets connected to the water outlet header outside the cylinder 1. The water inlet is located at the bottom of the heat exchange energy plate 2, and the water outlet is set at the top of the heat exchange energy plate 2.

[0032] In actual application, the waste heat boiler can be manufactured according to the above structure, or the cylinder of the dry dust removal converter EC tower can be directly used, and its upper space can be transformed, and the heat exchange energy plate 2 and the water-cooled support frame 3 are arranged in the cylinder of the EC tower to form the waste heat boiler of the present application. A steam drum is arranged outside the cylinder, and after the steam drum feed water enters the downcomer, it is driven by a forced circulation pump and enters the water inlet header and the water-cooled beam cold water inlet header 32, and then distributed into each heat exchange energy plate; after the energy plate absorbs the heat of the converter gas, the feed water in the pipe absorbs heat and turns into steam, and the steam-water mixture is collected from the water outlet of each energy plate through the water outlet header, and then returned to the steam drum through the ascending pipeline, and the steam and water are separated in the steam drum, the steam is sent out, and the feed water participates in heat exchange again, and the cycle is repeated.

[0033] The water-cooled heat exchange tube 31 passes water through the cold water inlet header 32 of the water-cooled beam, and the water pump drives the ~104℃ water after the deaerator into the water. The hot water then returns to the deaerator through the hot water outlet header 33 of the water-cooled beam, so that the support beam does not deform and does not produce thermal stress fatigue, which protects the structural stability of the entire waste heat boiler. Hot water entering the deaerator can reduce the steam consumption of deoxidation.

[0034] Although the utility model has been described in detail above with general descriptions and specific implementation schemes, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. A dry dust removal converter gas waste heat boiler with a water-cooled support frame, characterized in that: The invention comprises a cylinder (1), a heat exchange energy plate (2) and a water-cooled support frame (3); the heat exchange energy plate (2) is arranged inside the cylinder (1), extends from the inner wall of the cylinder (1) to the internal space and is placed in a vertical wall shape; the water-cooled support frame (3) is arranged below the heat exchange energy plate (2) and is used to support the heat exchange energy plate (2); the water-cooled support frame (3) comprises a water-cooled heat exchange tube (31), and the water-cooled heat exchange tube (31) is horizontally distributed below the heat exchange energy plate (2) and is in contact with the bottom of the heat exchange energy plate (2).

2. The dry dust removal converter gas waste heat boiler with a water-cooled support frame according to claim 1 is characterized in that: Both end openings of the water-cooled heat exchange tube (31) pass through the cylinder wall of the cylinder (1), one end opening is connected to a water-cooled beam cold water inlet header (32) outside the cylinder (1), and the other end opening is connected to a water-cooled beam hot water outlet header (33) outside the cylinder (1).

3. The dry dust removal converter gas waste heat boiler with a water-cooled support frame according to claim 2 is characterized in that: A plurality of water-cooled heat exchange tubes (31) are arranged in parallel.

4. The dry dust removal converter gas waste heat boiler with a water-cooled support frame according to claim 2 is characterized in that: The portion of the water-cooled heat exchange tube (31) located inside the cylinder (1) has a tube surface covered with an anti-wear sleeve.

5. The dry dust removal converter gas waste heat boiler with a water-cooled support frame according to claim 1, characterized in that: The water-cooled support frame (3) further comprises a bottom support beam (34), the two ends of which are fixed to the cylinder (1) and arranged horizontally, the water-cooled heat exchange tube (31) being arranged on the bottom support beam (34), and the bottom support beam (34) being used to fix and support the water-cooled heat exchange tube (31); as a specific implementation scheme, a plurality of bottom support beams (34) are arranged in parallel, and all are perpendicular to the water-cooled heat exchange tube (31).

6. The dry dust removal converter gas waste heat boiler with a water-cooled support frame according to claim 1, characterized in that: The heat exchange energy plate (2) is mainly composed of an energy plate heat exchange tube (21) and a protective plate (22); the energy plate heat exchange tube (21) is distributed inside the protective plate (22) in a vertical serpentine state, and its two end openings pass through the protective plate (22) and the cylinder (1) in sequence to communicate with the outside.

7. The dry dust removal converter gas waste heat boiler with a water-cooled support frame according to claim 6, characterized in that: The heat exchange energy plates (2) are symmetrically distributed on both sides of any longitudinal section passing through the central axis in the cylinder (1), and the energy plates on the same side are placed parallel to each other.

8. The dry dust removal converter gas waste heat boiler with a water-cooled support frame according to claim 7, characterized in that: The heat exchange energy plates (2) are arranged to have different widths and are placed in sequence; the energy plate heat exchange tubes (21) in each energy plate have their water inlets connected to a water inlet header outside the cylinder (1), and their water outlets connected to a water outlet header outside the cylinder (1); the water inlets are located at the bottom of the heat exchange energy plates (2), and the water outlets are arranged at the top of the heat exchange energy plates (2).

9. The dry dust removal converter gas waste heat boiler with a water-cooled support frame according to claim 6, characterized in that: The water inlet end of the energy plate heat exchange tube (21) is fixedly connected to the wall of the cylinder (1), and the water outlet end is connected to the wall of the cylinder (1) via an expansion joint (23).

10. The dry dust removal converter gas waste heat boiler with a water-cooled support frame according to claim 6, characterized in that: The surface of the energy plate heat exchange tube (21) is also provided with H-shaped straight fins (24), and the H-shaped straight fins (24) pass through the protective plate (22) to be exposed.

11. The dry dust removal converter gas waste heat boiler with a water-cooled support frame according to claim 1, characterized in that: The converter gas waste heat boiler also includes a gas inlet arranged at the top of the cylinder (1) and a gas outlet at the bottom, and the heat exchange energy plate (2) is arranged in the upper area inside the cylinder (1), below the gas inlet, and is placed in a vertical wall shape.

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