A sinter cooling waste heat boiler in-furnace air mixing, temperature uniformizing and flow uniformizing device

Abstract

The utility model discloses a sintering cooling waste heat boiler furnace mixes wind temperature -equalizing flow uniformity device, and the furnace body upper portion is equipped with independent I section high temperature, II section low temperature flue gas import, and the middle part is equipped with mixing wind temperature -equalizing flow uniformity device, and from top to bottom is the senior flow uniformity baffle layer, the lower level mixing wind temperature -equalizing flow uniformity layer, and the lower part is equipped with heat exchange module. I section high temperature flue gas is through import, high temperature superheater heat exchange, and with II section low temperature flue gas in the device, and the arc guide vane is guided, and the staggered inverted buckle channel bar flow uniformity, realizes temperature and flow equalization after entering heat exchange module, and the device solves the traditional two -way exhaust gas intersection temperature difference stress, and the problem of deflection, optimizes the boiler operating environment, prolongs the life, and creates economic benefits for the steel plant, and is applicable to sintering cooling waste heat boiler waste heat recovery scene.

Description

Technical Field

[0001] This utility model belongs to the field of waste heat recovery in steel plant sintering cooling process, and relates to a device for mixing air, equalizing temperature and flow in a sintering cooling waste heat boiler. Background Technology

[0002] Currently, steel plants commonly use ring coolers or belt coolers for sintering cooling. In the total energy consumption of sintering, the sensible heat carried away by the exhaust gas from the cooler accounts for approximately 20-80% of the total energy consumption, while the waste heat emitted accounts for about 49% of the total heat energy consumed. Therefore, recovering and utilizing this waste heat is extremely important. The sintering cooling process is relatively long, generally divided into several air box cooling stages. The first stage of waste heat recovery uses high-temperature exhaust gas at 380-450℃, while the second stage uses low-temperature exhaust gas at 300-350℃. The temperature decreases in a stepped manner along the direction of the ore cart's movement. To improve waste heat recovery efficiency, the waste heat recovery of cooling exhaust gas also adopts a stepped recovery method. The high-temperature exhaust gas in section I passes through the high-temperature superheater first and is then sent to the subsequent boiler heating surface together with the low-temperature exhaust gas in section II. However, there is still a temperature difference of 30 to 50°C between the two cooling exhaust gases. The convergence process of the two exhaust gases will generate great thermal stress on the boiler components in the convergence area and cause flow deviation due to the different temperatures and flow rates of the two cooling exhaust gases, which will deteriorate the boiler's operating environment and is an adverse factor affecting the service life of the boiler. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model innovatively arranges a mixing and temperature equalization device in the confluence area of ​​the two cooling exhaust gases, so as to achieve uniformity of temperature and flow of exhaust gases of different grades, optimize the operating environment of boiler equipment, and thus extend the service life of boiler.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] This utility model discloses an in-furnace mixing, temperature equalization, and flow equalization device for a sintering cooling waste heat boiler, comprising a furnace body. The upper part of the furnace body is provided with two independent I-section high-temperature flue gas inlets and II-section low-temperature flue gas inlets. The mixing, temperature equalization, and flow equalization device is provided in the middle of the furnace body. From top to bottom, the mixing, temperature equalization, and flow equalization device includes an upper flow equalization baffle layer and a lower mixing, temperature equalization, and flow equalization layer. The upper flow equalization baffle layer is located directly below the I-section high-temperature flue gas inlet and above the middle of the furnace body. The lower mixing, temperature equalization, and flow equalization layer is located below the middle of the furnace body and can cover the flue gas entering through the I-section high-temperature flue gas inlet and the II-section low-temperature flue gas inlet. A heat exchange module is provided in the lower part of the furnace body.

[0006] Preferably, an arc-shaped guide plate is provided at one corner of the high-temperature flue gas inlet of section I. The arc-shaped guide plate and the upper-level flow equalization baffle layer form a low-temperature flue gas channel. This low-temperature flue gas channel faces directly below the high-temperature flue gas inlet of section I, so as to achieve the merging of flue gas entering from the high-temperature flue gas inlet of section I with the flue gas entering from the high-temperature flue gas inlet of section I. That is, the upper-level flow equalization baffle layer and the arc-shaped guide plate work together to guide the low-temperature flue gas flow of section II towards the area through which the high-temperature flue gas of section I flows.

[0007] Preferably, a high-temperature superheater is provided at the bottom of the high-temperature flue gas inlet of section I. The high-temperature flue gas of section I enters from the outside to the inside through the high-temperature flue gas inlet of section I, and after heat exchange by the high-temperature superheater, it is uniformly mixed with the low-temperature flue gas of section II in the lower stage mixing air uniform temperature flow layer before being sent to the subsequent heat exchange module of the boiler.

[0008] Preferably, the heat exchange module 4 is provided in multiple parts, and all of them are arranged below the lower-level mixing air temperature equalization and uniform flow layer.

[0009] Preferably, the arc-shaped guide plate is provided such that the arc-shaped guide surface of the arc-shaped guide plate faces away from the high-temperature superheater.

[0010] Preferably, the upper flow equalization baffle layer is arranged with three layers of staggered inverted channel steel for uniformly distributing the low-temperature flue gas in the second stage; the three layers of staggered inverted channel steel include three layers of channel steel, each layer of channel steel with its opening facing upward and the channel steels being arranged at equal intervals, the channel steels between adjacent upper and lower layers being staggered, and the channel steels in the high-temperature region near the inlet of the high-temperature flue gas in the first stage being arranged in a stepped manner, so as to deflect the low-temperature flue gas in the second stage to the area through which the high-temperature flue gas in the first stage flows.

[0011] Preferably, a space is left between the upper flow equalization baffle layer and the lower air mixing and temperature equalization flow equalization layer to ensure that the flue gas in sections I and II is fully mixed.

[0012] Preferably, the lower-level mixing and temperature equalization flow layer is provided with double-layer staggered inverted channel steel to further ensure that the flue gas in sections I and II is fully mixed; the double-layer staggered inverted channel steel includes two layers of channel steel, each layer of channel steel with the opening facing upward and the channel steels are arranged at equal intervals, and the channel steels in the upper and lower layers are staggered.

[0013] Preferably, the arc-shaped guide vane has a large bending radius to ensure smooth guidance; the radius of the arc-shaped guide vane is not less than 500mm.

[0014] The beneficial effects of this utility model are as follows: Unlike the previous method where different flue gas temperatures directly enter the heat exchange module, this utility model innovatively adopts an in-furnace mixing and temperature equalization device to ensure the uniformity of the flow of the two flue gas streams in the furnace. At the same time, it significantly reduces the temperature difference when entering the subsequent heat exchange module, reduces the temperature difference stress of the module heat exchange tubes, and improves the service life of the boiler. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the existing technology structure.

[0016] Figure 2 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 3 This is a schematic diagram of the arc-shaped guide plate structure of this utility model.

[0018] Figure 4 This is a schematic diagram of the upper-level flow equalization baffle structure of this utility model.

[0019] Figure 5 This is a schematic diagram of the lower-level mixing air temperature equalization and uniform flow layer structure of this utility model. Detailed Implementation

[0020] The following will refer to the appendix in the embodiments of this utility model. Figures 2-5 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] In the description of the utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] The device consists of an arc-shaped guide plate A, an upper-level flow equalization and uniform flow layer B, a lower-level mixing and temperature equalization and uniform flow layer C, a first-stage high-temperature flue gas inlet 1, a second-stage low-temperature flue gas inlet 5, a high-temperature superheater 2, a heat exchange module 4, and the furnace body. During the boiler manufacturing and assembly stage, the furnace frame is first installed according to the design dimensions and positions. The high-temperature superheater 2 is then installed at the corresponding position at the bottom of the first-stage high-temperature flue gas inlet 1. Next, the arc-shaped guide plate A is installed, ensuring its large bending radius is strictly controlled to be no less than 500mm, the arc-shaped guide surface faces away from the high-temperature superheater 2, and it forms a reasonable low-temperature flue gas channel with the subsequently installed upper-level flow equalization and uniform flow layer B. Then, the upper-level flow equalization and uniform flow layer B is installed, precisely arranging three layers of staggered, inverted channel steel, ensuring that the openings of the three layers of channel steel face upwards. The channel steel is arranged in a stepped manner with equal spacing and staggered arrangement between adjacent upper and lower layers, near the high-temperature area; the space between the upper flow equalization baffle layer B and the lower air mixing and temperature equalization flow uniform layer C is reserved according to the design to ensure ≥800mm, and is adapted to the flow cross section of the heat exchange module; then the lower air mixing and temperature equalization flow uniform layer C is installed, with double-layer staggered inverted channel steel arranged to meet the requirements of upward opening, equal spacing, and staggered upper and lower layers; finally, multiple heat exchange modules 4 are installed below the lower air mixing and temperature equalization flow uniform layer C, ensuring accurate positioning and stable connection.

[0024] Work process and principles:

[0025] Flue gas entry and initial guidance: High-temperature flue gas from the sintering and cooling process of the steel plant is fed in through the high-temperature flue gas inlet 1, and first passes through the high-temperature superheater 2 for heat exchange, resulting in a temperature reduction. Low-temperature flue gas from the second stage enters the furnace mixing and temperature equalization device through the low-temperature flue gas inlet 5. At this time, the arc-shaped guide plate A plays a role, as its large bending radius ensures smooth guidance, guiding part of the low-temperature flue gas from the second stage to the flow area of ​​the high-temperature flue gas from the first stage after being cooled by the high-temperature superheater 2, and initial mixing begins.

[0026] The function of the upper flow equalization baffle layer B: When the low-temperature flue gas from section II enters the upper flow equalization baffle layer B, the special structure of the three layers of staggered inverted channel steel increases the surface area of ​​the windward side, enhances the baffle effect, and the staggered and stepped arrangement of the layers guides the flue gas to flow evenly in the designed direction. Together with the arc-shaped guide plate A, it guides more of the low-temperature flue gas from section II to the flow area of ​​high-temperature flue gas from section I, so that the two are more fully mixed and the temperature difference is further reduced.

[0027] Sufficient mixing space guarantee: The space reserved between the upper flow equalization baffle layer B and the lower air mixing temperature equalization flow equalization layer C is ≥800mm. This space has the same flow cross section as the heat exchange module and has no heat exchange elements. The flue gas velocity is relatively lower than other areas inside the boiler, providing sufficient mixing space and time for the low-temperature flue gas in section II and the high-temperature flue gas in section I, so that they can achieve temperature and flow uniformity as much as possible before entering the lower air mixing temperature equalization flow equalization layer C.

[0028] The final flow equalization in the lower-level mixing and temperature equalization layer C: After being mixed in the previous stages, the flue gas enters the lower-level mixing and temperature equalization layer C. Its double-layer staggered inverted channel steel further equalizes the flow of the flue gas, ensuring that the low-temperature flue gas in section II and the high-temperature flue gas in section I are mixed evenly, forming a flue gas with uniform temperature and flow rate. This flue gas flows stably to the heat exchange module 4 of the boiler. After entering the heat exchange module 4, the waste heat recovery heat exchange process is carried out smoothly, providing flue gas with stable parameters for subsequent processes and optimizing the overall operating environment of the boiler.

[0029] Through the synergistic effect of the above components, this device achieves uniform mixing and flow of high-temperature flue gas in section I and low-temperature flue gas in section II with different temperatures and flow rates in the furnace. It effectively solves the problems of temperature difference stress and flow deviation in the two flue gas channels in the traditional layout, improves the efficiency and service life of boiler waste heat recovery, and provides a more reliable and efficient technical solution for waste heat recovery in the sintering cooling process of steel plants.

[0030] In summary, this utility model design offers significant implicit economic benefits and a more stable boiler operating environment. Finally, it should be noted that this utility model is not limited to the above embodiments and can have many variations. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the scope of protection of this utility model.

Claims

1. A device for mixing, equalizing temperature, and equalizing flow of air inside a sintering cooling waste heat boiler, characterized in that: The furnace body includes two independent I-stage high-temperature flue gas inlets (1) and II-stage low-temperature flue gas inlets (5) located on its upper part. The furnace body is provided with a mixing air temperature equalization and flow equalization device in the middle. From top to bottom, the mixing air temperature equalization and flow equalization device includes an upper flow equalization baffle layer (B) and a lower mixing air temperature equalization and flow equalization layer (C). The upper flow equalization baffle layer (B) is located directly below the high temperature flue gas inlet (1) of section I and above the middle of the furnace body. The lower mixing air temperature equalization and flow equalization layer (C) is located below the middle of the furnace body and can cover the flue gas entering through the high temperature flue gas inlet (1) of section I and the low temperature flue gas inlet (5) of section II. The lower part of the furnace body is provided with a heat exchange module (4).

2. The sintering cooling waste heat boiler furnace mixing, temperature equalization, and flow equalization device according to claim 1, characterized in that: An arc-shaped guide plate (A) is provided at one corner of the high-temperature flue gas inlet (1) of section I. A low-temperature flue gas channel is formed between the arc-shaped guide plate (A) and the upper flow equalization baffle layer (B). The low-temperature flue gas channel faces directly below the high-temperature flue gas inlet (1) of section I, so as to realize the merging of the flue gas entering from the high-temperature flue gas inlet (1) of section I with the flue gas entering from the high-temperature flue gas inlet (1).

3. The sintering cooling waste heat boiler furnace mixing, temperature equalization, and flow equalization device according to claim 1, characterized in that: A high-temperature superheater (2) is provided at the bottom of the high-temperature flue gas inlet (1) of section I. The high-temperature flue gas of section I enters from the outside to the inside through the high-temperature flue gas inlet (1), and after being heated by the high-temperature superheater (2), it is evenly mixed with the low-temperature flue gas of section II in the lower stage mixing air uniform temperature flow layer (C) and then sent to the subsequent heat exchange module (4) of the boiler.

4. The sintering cooling waste heat boiler furnace mixing, temperature equalization, and flow equalization device according to claim 1 or 3, characterized in that: The heat exchange module (4) is provided in multiple units, and all of them are arranged below the lower-level mixing air temperature equalization and uniform flow layer (C).

5. The sintering cooling waste heat boiler furnace mixing, temperature equalization, and flow equalization device according to claim 1, characterized in that: The arc-shaped guide plate (A) is provided with its guiding arc surface facing away from the high-temperature superheater (2).

6. The sintering cooling waste heat boiler furnace mixing, temperature equalization, and flow equalization device according to claim 1, characterized in that: The upper flow equalization baffle layer (B) is arranged with three layers of staggered inverted channel steel for uniformly equipping the low-temperature flue gas of section II; the three layers of staggered inverted channel steel include three layers of channel steel, each layer of channel steel with the opening facing upward and the channel steels are arranged at equal intervals, the channel steels between adjacent upper and lower layers are staggered, and the channel steels near the inlet (1) of high-temperature flue gas of section I are arranged in a stepped manner to deflect the low-temperature flue gas of section II to the area through which the high-temperature flue gas of section I flows.

7. The sintering cooling waste heat boiler furnace mixing, temperature equalization, and flow equalization device according to claim 6, characterized in that: A space is left between the upper flow equalization baffle layer (B) and the lower air mixing and temperature equalization flow equalization layer (C) to ensure that the flue gas in sections I and II is fully mixed.

8. The sintering cooling waste heat boiler furnace mixing, temperature equalization, and flow equalization device according to claim 6 or 7, characterized in that: The lower-level mixing and temperature equalization flow layer (C) is provided with double-layer staggered inverted channel steel to further ensure that the flue gas in sections I and II is fully mixed; the double-layer staggered inverted channel steel includes two layers of channel steel, each layer of channel steel with the opening facing upward and the channel steels are arranged at equal intervals, and the channel steels in the upper and lower layers are staggered.

9. The sintering cooling waste heat boiler furnace mixing, temperature equalization, and flow equalization device according to claim 1 or 5, characterized in that: The arc-shaped guide vane (A) has a large bending radius to ensure smooth guidance; the radius of the arc-shaped guide vane (A) is not less than 500mm.

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