Converter gas waste heat boiler with barrel wall cooling effect

Abstract

The converter gas waste heat boiler with the barrel wall cooling effect comprises a barrel body, a heat exchange energy plate and a cooling pipe, the heat exchange energy plate is arranged inside the barrel body, extends to the inner space from the position close to the inner wall of the barrel body and is placed in a vertical wall shape, and the cooling pipe is arranged outside the barrel body and tightly attached to the outer wall of the barrel body. The waste heat boiler is arranged at the upper part of a dry dedusting converter EC tower. Compared with the prior art, the waste heat boiler can effectively recycle waste heat of a high-temperature section of converter gas, the cooling pipe is arranged on the outer wall of the barrel, the barrel wall cooling effect is achieved, the tower wall can be protected, and overtemperature of the tower wall is prevented. According to the technology, waste heat recovery can be carried out on high-temperature section coal gas in the converter coal gas boiler, grade-grade middle-high pressure saturated steam can be generated, the water spraying amount is reduced, the coal gas working condition volume flow of a boiler outlet is reduced, and the follow-up treatment cost of the converter coal gas is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of converter gas waste heat recovery, in particular to a converter gas waste heat boiler with a cylinder wall cooling effect. Background Art

[0002] The converter gas of ~1600℃ coming out of the steelmaking converter (some people call it converter flue gas, because it contains the combustible component CO, its content is as high as more than 70%, and the rest is CO2 and O2, so it is also called converter gas. It also contains a lot of dust, and the dust contains more usable components such as iron and magnesium, which need to be recovered) first enters the vaporization cooling flue waste heat boiler and cools down to ~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 relatively 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, flammability, and extremely harsh conditions.

[0003] Converter gas at ~1000°C, due to the hardened dust, causes significant wear on metal walls. Currently, the gas enters an evaporative cooler, where it is cooled to ~200°C with cold water before being dust-removed and purified. This results in significant energy waste, making the recovery of this high-quality heat extremely important. The applicant's previous patent application proposed installing energy panels on the vertical walls of the evaporative cooler, effectively recovering high-quality heat. However, this approach also presents some challenges, such as the high flue gas temperature, which can easily cause the cylinder wall to overheat. Utility Model Content

[0004] Technical problem: In order to solve the defects of the existing technology, the utility model provides a converter gas waste heat boiler with a cylinder wall cooling effect.

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

[0006] A converter gas waste heat boiler with wall cooling comprises a barrel, a heat exchange plate, and a cooling pipe. The heat exchange plate is positioned within the barrel, extending from near the inner wall into the interior space and arranged in a vertical wall configuration. The cooling pipe is positioned outside the barrel and closely adheres to the outer wall. This waste heat boiler is installed above the EC tower of a dry dust removal converter.

[0007] As a specific embodiment, the heat exchange plate primarily consists of plate heat exchange tubes and a protective plate. The plate heat exchange tubes are arranged in a vertical serpentine pattern within the protective plate, with their ends opening through the protective plate and the cylinder to connect to the outside. The protective plate protects the heat exchange tubes from wear and tear from converter gas.

[0008] Furthermore, a number of heat exchange energy plates are arranged adjacent to each other, and each energy plate starts from near the central axis of the cylinder and is distributed divergently along the radius of the cylinder; 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 are connected to the water outlet header outside the cylinder.

[0009] 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.

[0010] 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 protective plate and are exposed. This design can absorb the heat released by the converter gas and improve the heat exchange efficiency.

[0011] As a specific implementation scheme, the converter gas waste heat boiler also includes a gas inlet at the top of the cylinder and a gas outlet 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.

[0012] As a specific implementation scheme, a plurality of cooling pipes are adjacently arranged along the outer wall of the cylinder, and the upper and lower pipes are connected in a serpentine shape.

[0013] As a preferred embodiment, the cooling pipes are evenly distributed along the outer wall of the cylinder. For easy transportation, four cooling pipes are set adjacent to each other in the entire boiler. The arc length of each cylinder wall is 1 / 4 of the circumference, and the area of ​​the outer wall of the cylinder occupied by each cooling pipe is the same.

[0014] As a specific implementation scheme, the water inlet of the cooling pipe is connected to the water inlet header outside the cylinder, and the water outlet is connected to the water outlet header outside the cylinder.

[0015] As a specific implementation scheme, the cooling pipe is a serpentine coil.

[0016] The "vertical wall shape" mentioned in the present invention refers to the heat exchange energy plate being 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 existing technologies, this utility model recovers waste heat from the high-temperature section of converter gas. Cooling pipes are installed on the outer wall of the drum, providing a cooling effect on the drum wall and protecting it from overheating. This technology recovers waste heat from the high-temperature section of gas within the converter gas boiler, generating high-quality medium- and high-pressure saturated steam. This reduces the amount of water sprayed, the operating volume flow rate of gas at the boiler outlet, and the subsequent processing costs of the converter gas. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 This is a schematic diagram of the internal structure of the heat exchange plate in the waste heat boiler of the utility model.

[0020] Figure 3 This is an external stereoscopic view of the heat exchange plate in the waste heat boiler of the present invention (with a straight fin structure).

[0021] Figure 4 This is a diagram showing the connection between the water outlet end of the heat exchange tube of the energy plate and the cylinder wall of the waste heat boiler of the present invention.

[0022] Figure 5 This is a schematic diagram of the arrangement of the heat exchange plates in the waste heat boiler of the present invention (horizontal cross-section of the cylinder).

[0023] Figure 6 This is a schematic diagram of the arrangement of cooling pipes in the waste heat boiler of the utility model (1 / 4 of the outer circumference of the cylinder).

[0024] Figure 7 This is a schematic diagram of the positions of the heat exchange plates and cooling pipes in the waste heat boiler of the present invention (1 / 4 of the horizontal cross section of the cylinder). DETAILED DESCRIPTION

[0025] The device of the utility model is further described below with reference to the accompanying drawings.

[0026] In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "top", "bottom", "inside", "outside", etc. indicating orientations or positional relationships, they are based on the orientations or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does 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 positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent.

[0027] Example 1

[0028] A converter gas waste heat boiler with cylinder wall cooling effect, such as Figure 1 As shown, the waste heat boiler comprises a cylinder 1, a heat exchange plate 2, and a cooling tube 3. The heat exchange plate 2 is disposed within the cylinder 1, extending from near the inner wall of the cylinder 1 into the interior space and arranged as a vertical wall. The cooling tube 3 is disposed outside the cylinder 1 and closely adheres to the outer wall of the cylinder 1. 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 plate 2 is disposed in the upper area of ​​the cylinder 1, below the gas inlet, and arranged as a vertical wall. The boiler also includes a cooling device 4 disposed within the cylinder 1. The cooling device 4 is specifically a spray device for spraying cold water below it.

[0029] like Figure 2 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 in a vertical serpentine state inside the guard plate 22, and its two ends are opened through the guard plate 22 and the cylinder 1 in sequence to communicate with the outside. Figure 3 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 protective plate 22 and are exposed to absorb the heat released by the converter gas, thereby improving 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, as shown in FIG. Figure 4 As shown, the water outlet end is connected to the wall of the cylinder 1 via an expansion joint 23 to ensure different expansion amounts in the height direction of the cylinder wall and the energy plate.

[0030] like Figure 5 As shown, several heat exchange energy plates 2 are arranged adjacent to each other, and each energy plate starts from near the central axis of the cylinder and is divergently distributed along the radius of the cylinder; 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 are connected to the water outlet header outside the cylinder 1.

[0031] Several cooling pipes 3 are arranged adjacent to each other along the outer wall of the cylinder 1. As a specific solution of this embodiment, Figure 6 and Figure 7 As shown, the cooling tube 3 is a serpentine coil, and four of them are evenly and adjacently arranged along the outer wall of the cylinder 1. Each cooling tube 3 occupies the same area of ​​the outer wall of the cylinder 1, and the arc length is 1 / 4 of the circumference. Figure 6 and Figure 7 The figure shows the arrangement of a cooling pipe 3. The water inlet of each cooling pipe 3 is connected to the water inlet header outside the cylinder 1, and the water outlet is connected to the water outlet header outside the cylinder 1.

[0032] Figure 6 In the diagram, the upper row of circular holes represents the water outlets for the heat exchange tubes 21, while the lower row of circular holes represents the water inlets for the heat exchange tubes 21. The two circular holes at the ends of the cooling tubes 3 serve as their water inlet and outlet, respectively. The height and position of the cooling tubes 3 roughly correspond to those of the heat exchange plates 2.

[0033] The waste heat boiler is installed on the upper part of the EC tower of the dry dust removal converter, and a steam drum is set outside. After the steam drum feed water enters the downcomer, it is driven by a forced circulation pump into the water inlet header and then distributed to each heat exchange energy plate and each cooling tube; after the energy plate absorbs the heat of the converter gas, the feed water in the tube absorbs heat and turns into steam. The steam-water mixture is collected through the water outlet of each energy plate and the water outlet of each cooling tube through the water outlet header, and then returned to the steam drum through the ascending pipe. 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 continues.

[0034] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made to the present invention. Therefore, such modifications or improvements, without departing from the spirit of the present invention, are within the scope of protection claimed herein.

Claims

1. A converter gas waste heat boiler with cylinder wall cooling effect, characterized in that: The invention comprises a cylinder (1), a heat exchange energy plate (2) and a cooling pipe (3); the heat exchange energy plate (2) is arranged inside the cylinder (1), extends from the vicinity of the inner wall of the cylinder (1) to the internal space and is placed in the shape of a vertical wall; the cooling pipe (3) is arranged outside the cylinder (1) and is in close contact with the outer wall of the cylinder (1).

2. The converter gas waste heat boiler with cylinder wall cooling effect 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.

3. The converter gas waste heat boiler with cylinder wall cooling effect according to claim 2, characterized in that: A plurality of heat exchange energy plates (2) are arranged adjacent to each other, each energy plate starting from the vicinity of the central axis of the cylinder and distributed in a divergent manner along the radial direction of the cylinder; the energy plate heat exchange tubes (21) in each energy plate have water inlets connected to a water inlet header outside the cylinder (1), and water outlets connected to a water outlet header outside the cylinder (1).

4. The converter gas waste heat boiler with cylinder wall cooling effect according to claim 2, 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).

5. The converter gas waste heat boiler with cylinder wall cooling effect according to claim 2, 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.

6. The converter gas waste heat boiler with cylinder wall cooling effect 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.

7. The converter gas waste heat boiler with cylinder wall cooling effect according to claim 1, characterized in that: A plurality of cooling pipes (3) are arranged adjacent to each other along the outer wall of the cylinder (1).

8. The converter gas waste heat boiler with cylinder wall cooling effect according to claim 1, characterized in that: Four cooling pipes (3) are evenly and adjacently arranged along the outer wall of the cylinder (1), and the area of ​​the outer wall of the cylinder (1) occupied by each cooling pipe (3) is the same.

9. The converter gas waste heat boiler with cylinder wall cooling effect according to claim 1, characterized in that: The water inlet of the cooling pipe (3) is connected to the water inlet header outside the cylinder (1), and the water outlet is connected to the water outlet header outside the cylinder (1).

10. The converter gas waste heat boiler with cylinder wall cooling effect according to claim 1, characterized in that: The cooling pipe (3) is a serpentine coil.

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