Opposite-spraying gradually-expanding type flue gas mixed air heating device

Abstract

The utility model relates to the technical field of flue gas heating, and provides an opposite-spraying gradually-expanding flue gas mixed air heating device which comprises a low-temperature flue gas inlet pipe, an opposite-spraying mixing pipe, a gradually-expanding mixing pipe and a mixed flue gas outlet pipe which are coaxially arranged and sequentially connected. The end, with the minimum diameter, of the gradually-expanding mixing pipe is connected with the opposite-spraying mixing pipe. A high-temperature flue gas opposite-spraying pipe is arranged on the opposite-spraying mixing pipe, the high-temperature flue gas opposite-spraying pipe is provided with a gas inlet and two opposite-spraying gas outlets, and the two opposite-spraying gas outlets are symmetrically arranged relative to the axis of the opposite-spraying mixing pipe; the spraying direction of high-temperature flue gas of the opposite spraying gas outlet is perpendicular to the entering direction of low-temperature flue gas of the low-temperature flue gas inlet pipe, and first-stage collision mixing of the flue gas is achieved through perpendicular collision of the high-temperature flue gas and the low-temperature flue gas; second-stage diffusion mixing and third-stage baffling reverse mixing of the flue gas are achieved in the divergent mixing pipe, finally, full mixing of the low-temperature flue gas and the high-temperature flue gas is achieved, and rapid temperature rising of the low-temperature flue gas is achieved.

Description

Technical Field

[0001] This application belongs to the field of flue gas heating technology, and more specifically, relates to a counter-spraying, gradually expanding flue gas mixing and heating device. Background Technology

[0002] In flue gas treatment, certain operating conditions require raising the flue gas temperature. Existing heating methods typically employ indirect heat exchange, such as heat exchangers, to raise the flue gas temperature. However, for flue gas containing corrosive dust or waste gases, indirect heat exchange can easily corrode materials, causing economic losses. Existing factories have equipment such as gas-fired or coal-fired hot air furnaces, which generate high-temperature flue gas and form high-temperature air. Researching how to utilize this high-temperature air to heat the low-temperature flue gas to replace existing indirect heat exchange methods is significant for cost savings and equipment protection. Utility Model Content

[0003] To address the shortcomings of existing flue gas heating methods, the purpose of this application is to provide a counter-spraying, gradually expanding flue gas mixing and heating device that can effectively utilize high-temperature air to heat low-temperature flue gas.

[0004] To achieve the above objectives, the technical solution adopted in this application is: to provide a counter-spraying and gradually expanding flue gas mixing and heating device, comprising: a low-temperature flue gas inlet pipe, a counter-spraying mixing pipe, a gradually expanding mixing pipe and a mixed flue gas outlet pipe arranged coaxially and connected in sequence; the smallest diameter end of the gradually expanding mixing pipe is connected to the counter-spraying mixing pipe;

[0005] The high-temperature flue gas jet pipe is provided on the jet mixing pipe. The high-temperature flue gas jet pipe has one air inlet and two jet outlets. The two jet outlets are symmetrically arranged about the axis of the jet mixing pipe. The high-temperature flue gas jetting direction of the jet outlet is perpendicular to the low-temperature flue gas entering direction of the low-temperature flue gas inlet pipe.

[0006] In one embodiment, the diameter of the low-temperature flue gas inlet pipe is smaller than the diameter of the counter-spray mixing pipe, the diameter of the counter-spray mixing pipe is equal to the minimum end diameter of the gradually expanding mixing pipe, and the diameter of the mixed flue gas outlet pipe is smaller than the minimum end diameter of the gradually expanding mixing pipe.

[0007] In one embodiment, the two gas outlets are inserted into the gas mixing pipe and the distance between the two gas outlets is less than or equal to the diameter of the low-temperature flue gas inlet pipe.

[0008] In one embodiment, the gradually expanding mixing pipe includes a flared section and a cylindrical section, the diameter of the cylindrical section being connected to the largest diameter end of the flared section; the depth to which the mixed flue gas outlet pipe is inserted into the cylindrical section is between 0 and 1 / 2 of the diameter of the mixed flue gas outlet pipe.

[0009] In one embodiment, the widening angle of the flared pipe section is 5°-15°.

[0010] In one embodiment, a perforated flow equalization plate is provided inside the trumpet-shaped pipe section, and the perforated flow equalization plate is coaxially arranged with the mixed flue gas outlet pipe.

[0011] In one embodiment, the perforated flow equalization plate is installed inside the flared pipe section by multiple mounting rods arranged at equal arc intervals.

[0012] The beneficial effects of the counter-spraying gradually expanding flue gas mixing and heating device provided in this application are as follows: the first-stage collision mixing of flue gas is achieved by the perpendicular collision of high-temperature flue gas and low-temperature flue gas; the second-stage diffusion mixing and the third-stage deflection and reverse mixing of flue gas are achieved in the gradually expanding mixing tube, and finally the low-temperature flue gas and high-temperature flue gas are fully mixed, so as to achieve rapid heating of low-temperature flue gas. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A three-dimensional structural schematic diagram of the counter-injection gradually expanding flue gas mixing and heating device provided in the embodiments of this application;

[0015] Figure 2 This is a schematic diagram of the planar dimensions of the counter-spraying, gradually expanding flue gas mixing and heating device provided in the embodiments of this application;

[0016] Figure 3 This is a schematic diagram of the flue gas flow field in the counter-spraying, gradually expanding flue gas mixing and heating device provided in the embodiments of this application.

[0017] The following are the labeling elements in the figure:

[0018] 1. Low-temperature flue gas inlet pipe; 2. Opposite spray mixing pipe; 3. Gradual diffusion mixing pipe; 4. Mixed flue gas outlet pipe; 5. Mesh flow equalization plate; 6. High-temperature flue gas opposite spray pipe; 61. Air inlet; 62. Opposite spray outlet. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0021] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 this application and simplifying the description, and do not indicate or imply that the device or element 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 this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] like Figures 1-3 As shown, an embodiment of this application provides a counter-spraying, gradually expanding flue gas mixing and heating device. This counter-spraying, gradually expanding flue gas mixing and heating device includes: a low-temperature flue gas inlet pipe 1, a counter-spraying mixing pipe 2, a gradually expanding mixing pipe 3, and a mixed flue gas outlet pipe 4, all coaxially arranged and sequentially connected. The pipes can be connected via flange butt joints with a sealing ring between the flanges; alternatively, if disassembly is not required, the pipes can be connected by welding, depending on specific needs.

[0024] The smallest diameter end of the gradually expanding mixing pipe 3 is connected to the opposing spray mixing pipe 2. The opposing spray mixing pipe 2 is equipped with a high-temperature flue gas opposing spray pipe 6, which has one inlet 61 and two opposing spray outlets 62. The inlet 61 is connected to a high-temperature flue gas source, and the low-temperature flue gas inlet pipe 1 is connected to a low-temperature flue gas source. The two opposing spray outlets 62 are symmetrically arranged about the axis of the opposing spray mixing pipe 2, and the direction of high-temperature flue gas ejection from the opposing spray outlets 62 is perpendicular to the direction of low-temperature flue gas entry from the low-temperature flue gas inlet pipe 1.

[0025] In this embodiment, one end of the spray mixing pipe 2 has an end plate with a through hole of the same diameter as the low-temperature flue gas inlet pipe 1, and the other end is an open end connected to the smallest diameter end of the gradually expanding mixing pipe 3; similarly, the end of the gradually expanding mixing pipe 3 used to install the mixed flue gas outlet pipe 4 also has an end plate.

[0026] In this embodiment, the diameter d1 of the low-temperature flue gas inlet pipe 1 is smaller than the diameter d4 of the counter-injection mixing pipe 2, the diameter d4 of the counter-injection mixing pipe 2 is equal to the minimum end diameter of the gradually expanding mixing pipe 3, and the diameter d3 of the mixed flue gas outlet pipe 4 is smaller than the minimum end diameter of the gradually expanding mixing pipe 3; the diameter d1 of the low-temperature flue gas inlet pipe 1 is the same as the diameter d3 of the mixed flue gas outlet pipe 4.

[0027] Specifically, the two opposing air outlets 62 are inserted into the opposing air mixing pipe 2, and the distance x between the two opposing air outlets 62 is less than or equal to the diameter d1 of the low-temperature flue gas inlet pipe 1. The purpose of this arrangement is to ensure that the high-temperature flue gas is completely introduced into the low-temperature flue gas, so that the two collide violently.

[0028] Specifically, the diffuser mixing pipe 3 includes a flared section and a cylindrical section, with the diameter of the cylindrical section connected to the largest diameter end of the flared section. The ratio of the depth f of the mixed flue gas outlet pipe 4 inserted into the cylindrical section to the diameter d3 of the mixed flue gas outlet pipe 4 is 0-1 / 2. This arrangement is intended to allow the flue gas to collide with the end plate of the cylindrical section, undergo back-reversal mixing, and then be discharged from the mixed flue gas outlet. In this embodiment, the diffuser angle α of the flared section is 5°-15°, preferably 10°. The angle α is related to the flue gas flow rate or velocity at the outlet 62; the larger the flue gas flow rate or velocity, the larger the diffuser angle α, and vice versa.

[0029] In this embodiment, a perforated flow equalization plate 5 is provided inside the flared pipe section. The perforated flow equalization plate 5 is a circular perforated plate and is coaxially arranged with the mixed flue gas outlet pipe 4. The perforated flow equalization plate 5 is used to improve the flue gas mixing effect. In this embodiment, the perforated flow equalization plate 5 is installed inside the flared pipe section by multiple mounting rods arranged at equal arc intervals. One end of the mounting rod is installed on the mixed flue gas outlet pipe 4 or the end plate of the cylindrical section. When the perforated flow equalization plate 5 needs to be disassembled, the mounting rod is provided with a threaded section, the perforated flow equalization plate 5 is sleeved on the mounting rod, and nuts are screwed onto the mounting rods on both sides to fix its position. If disassembly is not required, four steel bars with equal arc intervals are welded inside the flared pipe section, and the steel bars are then welded to the circumference of the perforated flow equalization plate 5. The installation method of the perforated flow equalization plate 5 can be selected as detachable installation or welded fixed installation according to actual needs. If detachable installation is selected, its advantage is that perforated flow equalization plates 5 with different apertures can be selected according to the flue gas velocity.

[0030] like Figure 1 and Figure 3As shown, in this embodiment, the above structure enables three-stage mixing and heating of low-temperature flue gas. The first mixing zone is the area between the low-temperature flue gas inlet pipe 1 and the counter-spray outlet 62; the second mixing zone is the gradually expanding area within the trumpet-shaped pipe section; and the third mixing zone is located at the inlet area of ​​the mixed flue gas outlet pipe 4 after a reversal. The low-temperature flue gas to be heated enters the counter-spray mixing pipe 2 at high speed from the low-temperature flue gas inlet pipe 1. The high-temperature flue gas is symmetrically injected into the counter-spray mixing pipe 2 from the counter-spray outlet 62 and mixes violently with the low-temperature high-speed flue gas, thus completing the first-stage collision mixing and heating of the low-temperature flue gas. Due to the counter-spraying effect, the unmixed high-temperature flue gas enters the gradually expanding mixing pipe 3 and flows in a diffusion pattern, completing the second-stage diffusion mixing and heating with the low-temperature flue gas during the diffusion process. When the diffusion flue gas flows to the bottom of the gradually expanding mixing pipe 3, it is blocked and deflected by the end plate at the bottom, and flows in the opposite direction, mixing with the mainstream high-speed mixed flue gas, completing the third-stage deflected reverse mixing and heating. The mesh flow equalization plate 5 is used to further equalize and mix the mainstream high-speed mixed flue gas. If the perforated flow equalizer 5 is detachable, its structural features can be changed according to the characteristics of the flue gas. For example, when the dust content in the flue gas is high, the mesh size can be adjusted or the perforated flow equalizer 5 can be removed. The mixed flue gas after the mixing and heating process is completed is discharged through the mixed flue gas outlet pipe 4.

[0031] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A counter-spraying, gradually expanding flue gas mixing and heating device, characterized in that, include: The low-temperature flue gas inlet pipe (1), the opposing spray mixing pipe (2), the gradually expanding mixing pipe (3) and the mixed flue gas outlet pipe (4) are arranged coaxially and connected in sequence; the smallest diameter end of the gradually expanding mixing pipe (3) is connected to the opposing spray mixing pipe (2); The high-temperature flue gas jet pipe (6) is provided on the jet mixing pipe (2). The high-temperature flue gas jet pipe (6) has an air inlet (61) and two jet outlets (62). The two jet outlets (62) are symmetrically arranged about the axis of the jet mixing pipe (2). The high-temperature flue gas jet direction of the jet outlets (62) is perpendicular to the low-temperature flue gas inlet direction of the low-temperature flue gas inlet pipe (1).

2. The counter-jet gradually expanding flue gas mixing and heating device as described in claim 1, characterized in that: The diameter of the low-temperature flue gas inlet pipe (1) is smaller than the diameter of the opposing spray mixing pipe (2), the diameter of the opposing spray mixing pipe (2) is equal to the minimum end diameter of the gradually expanding mixing pipe (3), and the diameter of the mixed flue gas outlet pipe (4) is smaller than the minimum end diameter of the gradually expanding mixing pipe (3).

3. The counter-jet gradually expanding flue gas mixing and heating device as described in claim 2, characterized in that: The two jet outlets (62) are inserted into the jet mixing pipe (2) and the distance between the two jet outlets (62) is less than or equal to the diameter of the low-temperature flue gas inlet pipe (1).

4. The counter-jet gradually expanding flue gas mixing and heating device as described in claim 3, characterized in that: The gradually expanding mixing pipe (3) includes a horn-shaped pipe section and a cylindrical section. The diameter of the cylindrical section is connected to the largest end of the diameter of the horn-shaped pipe section. The depth to which the mixed flue gas outlet pipe (4) is inserted into the cylindrical section is between 0 and 1 / 2 of the diameter of the mixed flue gas outlet pipe (4).

5. The counter-jet gradually expanding flue gas mixing and heating device as described in claim 4, characterized in that: The expansion angle of the trumpet-shaped pipe section is 5°-15°.

6. The counter-jet gradually expanding flue gas mixing and heating device as described in claim 5, characterized in that: The horn-shaped pipe section is provided with a perforated flow equalization plate (5), which is coaxially arranged with the mixed flue gas outlet pipe (4).

7. The counter-jet gradually expanding flue gas mixing and heating device as described in claim 6, characterized in that: The perforated flow equalizer (5) is installed inside the horn-shaped pipe section by multiple mounting rods arranged at equal arc intervals.

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