A gas-to-gas heat exchanger inlet flow guiding structure

Abstract

This utility model discloses an inlet flow guiding structure for a gas-to-gas heat exchanger, comprising: a gas diameter-changing frame, which includes a diameter-changing inlet, a diameter-changing body, and a diameter-changing outlet; a grid structure disposed at the diameter-changing inlet; and baffles extending from the diameter-changing inlet to the diameter-changing outlet, with multiple baffles spaced apart. The baffles are installed throughout the entire length of the diameter-changing frame from inlet to outlet, and the sides of the baffles are at a certain angle. The baffles are equipped with flow guiding and turbulence-inducing structures, effectively ensuring uniform gas distribution and rapidly achieving turbulent flow. The baffles ensure full and uniform contact between the fluid and the heat exchange wall, effectively utilizing the entire heat exchange area and further enhancing the gas's heat exchange capacity.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to an inlet guide structure for a gas-to-gas heat exchanger. Background Technology

[0002] As core equipment for industrial waste heat recovery and efficient energy utilization, gas-to-gas heat exchangers are widely used in high-energy-consuming industries such as power, metallurgy, chemical, and building materials. For example, in boiler systems, they are air preheaters that use flue gas to preheat combustion air; in waste heat recovery systems, they are heat exchangers that recover heat from high-temperature process gases. Their performance directly affects the energy efficiency, operating costs, and pollutant emission levels of the entire system. Therefore, improving the heat exchange efficiency and operational reliability of gas-to-gas heat exchangers is of great significance for achieving industrial energy conservation and emission reduction under the "dual carbon" target. Although gas-to-gas heat exchanger technology is relatively mature, its performance in practical applications is often significantly reduced due to severely uneven inlet flow field distribution. When the gas diameter is too large, a series of problems arise when gas enters: such as severely uneven fluid distribution, leading to excessive local heat load, significantly reduced heat exchange effect, accelerated wear and reduced equipment lifespan, and increased risk of ash accumulation and blockage. This is a long-standing and urgently needed technical problem in this field.

[0003] Traditional flow equalization structures are nothing more than using various forms of guide plates. Patent CN104930540A discloses a flow equalization structure composed of several guide plates. However, the number of guide plates is small, the length is short, and there are no reinforcing parts between the guide plates. This makes it easy for the guide plates to fall off due to vibration during machine operation. The guide plates are also too short, which can cause the airflow near the outlet to mix with each other, resulting in poor flow equalization. Summary of the Invention

[0004] Purpose of the utility model: In order to overcome the shortcomings of the prior art, this utility model provides an inlet flow guiding structure for a gas-to-gas heat exchanger.

[0005] Technical solution: The gas-to-gas heat exchanger inlet guide structure provided by this utility model includes: A gas diameter-changing frame, comprising a diameter-changing inlet, a diameter-changing body, and a diameter-changing outlet; A grid structure is provided at the variable diameter inlet; A baffle plate is provided, extending from the variable diameter inlet to the variable diameter outlet, and multiple baffle plates are provided at intervals.

[0006] Furthermore, the grid structure is formed by multiple spaced-apart plates that are perpendicularly intersected with the front ends of the multiple baffle plates.

[0007] Furthermore, a filter assembly is provided inside the grille structure.

[0008] Furthermore, the filter assembly is a metal wire mesh, a metal foam, or a ceramic fiber.

[0009] Furthermore, multiple baffles are symmetrically spaced out from the center of the gas diameter-changing frame to the left and right sides.

[0010] Furthermore, the angle of inclination of the baffle plate to both sides increases sequentially, forming a variable diameter flow channel as the variable diameter body is formed.

[0011] Furthermore, the length of the first end of the baffle plate within the variable diameter inlet is 0.6-0.8 times the total length of the variable diameter inlet; the length of the last end of the baffle plate within the variable diameter outlet is 0.4-0.6 times the total length of the variable diameter outlet.

[0012] Furthermore, the baffle plate is provided with a flow guiding structure and a flow disturbance structure in sequence along its extension direction.

[0013] Furthermore, the flow guiding structure consists of multiple convex strips arranged at intervals along the airflow direction.

[0014] Furthermore, the turbulence structure consists of multiple protrusion structures laid from the end of the flow guiding structure to the end of the deflector plate.

[0015] Beneficial effects: Compared with the prior art, the advantages of this utility model are: (1) The baffle is installed inside the variable diameter frame from the inlet to the outlet, and the side of the baffle is at a certain angle. The baffle is equipped with a flow guiding structure and a flow turbulence structure, which can effectively make the gas entering it uniformly distributed. At the same time, it can quickly make the gas state reach turbulence. The baffle ensures that the fluid and the heat exchange wall are fully and uniformly in contact, so that the entire heat exchange area is effectively utilized, further improving the heat exchange capacity of the gas. (2) The inlet is inlaid with a design similar to a grid, so there is no need to use a separate grid, saving materials. The small square area in the middle of the grid is filled with filter material, which can pre-remove dust from the incoming gas. The uniform high-speed flow has a certain purging effect on the heat exchange surface, reducing the possibility of dust accumulation. It avoids the blockage of the flow channel and the decrease in heat exchange efficiency caused by dust accumulation, and reduces the frequency of shutdown for cleaning and maintenance costs. (3) When the gas enters, the various baffles will be affected and vibrate. The baffles are lengthened from the inlet to the outlet (longitudinal) to increase strength. The presence of the grid structure further enhances the strength (lateral). Both directions are supported, avoiding the impact of vibration on the lifespan during operation. After the flow field is uniform, the impact force of the fluid on the inner wall of the equipment changes from "concentrated on one side" to "uniformly distributed", avoiding the generation of periodic "excitation force" and preventing "resonance" caused by the superposition of excitation frequency and equipment natural frequency, thereby greatly reducing equipment vibration. The vibration amplitude can be reduced by 60%~80%. Attached Figure Description

[0016] Figure 1 This is a side sectional view of the present invention; Figure 2 This is a schematic diagram of the variable diameter inlet grille structure of this utility model; Figure 3 This is a schematic diagram of the baffle structure of this utility model. Detailed Implementation

[0017] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1-3 The gas-to-gas heat exchanger inlet guide structure shown includes: a gas diameter variable frame 1, a grid structure 2, and a baffle plate 3.

[0019] The gas diameter-changing frame 1 includes a diameter-changing inlet 101, a diameter-changing body 102, and a diameter-changing outlet 103. The grid structure 2 is located at the diameter-changing inlet 101. The baffles 3 extend from the diameter-changing inlet 101 to the diameter-changing outlet 103 and are arranged in multiple pieces at intervals.

[0020] The grid structure 2 is formed by multiple spaced-apart plates that are perpendicularly intersecting the heads of multiple baffle plates 3, creating several small grid structures inside. The gaps between these small grids are filled with filter material, which can be metal wire mesh. This metal wire mesh can be directly welded or bolted to metal filter equipment, providing good sealing performance and preventing detachment due to thermal expansion and contraction during long-term use. Alternatively, high-temperature resistant materials such as metal foam or ceramic fiber can be selected. The small grid structure not only serves to equalize flow, but the filter material inside also forms a stable three-dimensional filter body through close contact with the grid wall, overcoming the defects of traditional filters that are prone to shaking and breakage at diameter changes. It also eliminates the need for a separate filter housing, connecting flanges, and additional installation space, saving costs not only on materials but also on the overall costs of manufacturing, installation, and maintenance.

[0021] Four baffles 3 are symmetrically arranged from the center of the gas diameter-changing frame 1 to the left and right sides, with the tilt angle increasing in each direction. As the diameter-changing body 102 forms the diameter-changing flow channel, the outer frame 1 of the gas diameter-changing frame is divided into different cross sections.

[0022] The length of the first end of the baffle plate 3 within the variable diameter inlet 101 is 0.6-0.8 of the total length of the variable diameter inlet 101; the length of the last end of the baffle plate 3 within the variable diameter outlet 103 is 0.4-0.6 of the total length of the variable diameter outlet 103; and the thickness of the baffle plate 2 is preferably 6-10 mm.

[0023] The baffle plate 3 is provided with a flow guiding structure 301 and a turbulence 302 in sequence along its extension direction. The flow guiding structure 301 is a multi-rib structure arranged at intervals along the airflow direction, and the turbulence 302 is a multi-bump structure laid from the end of the flow guiding structure 301 to the end of the baffle plate 3.

[0024] The above structure can maximize the utilization rate of the heat exchange surface. The area that originally only participated in heat exchange can be increased to more than 85%, and the overall heat transfer coefficient of the system can be restored to 90%-95% of the design value. The heat recovery rate is significantly improved. For flue gas waste heat recovery heat exchangers, after setting baffles, the waste heat utilization rate can be increased from 50% to more than 80%, reducing energy waste and ensuring that the system achieves the expected energy saving target.

Claims

1. An inlet flow guiding structure for a gas-to-gas heat exchanger, characterized in that, include: Gas variable diameter frame (1), the gas variable diameter frame (1) includes a variable diameter inlet (101), a variable diameter body (102) and a variable diameter outlet (103). A grid structure (2) is provided at the variable diameter inlet (101); A baffle plate (3) is provided, extending from the variable diameter inlet (101) to the variable diameter outlet (103), and multiple baffle plates are provided at intervals.

2. The gas-to-gas heat exchanger inlet guide structure according to claim 1, characterized in that: The grid structure (2) is formed by multiple spaced-apart plates that are perpendicularly intersected with the front ends of multiple baffle plates (3).

3. The gas-to-gas heat exchanger inlet guide structure according to claim 1, characterized in that: The grid structure (2) is equipped with filter material inside.

4. The gas-to-gas heat exchanger inlet guide structure according to claim 3, characterized in that: The filter material is a metal wire mesh, a metal foam, or a ceramic fiber.

5. The gas-to-gas heat exchanger inlet guide structure according to claim 1, characterized in that: The baffles (3) are arranged symmetrically at intervals from the center of the gas diameter-changing frame (1) to the left and right sides.

6. The gas-to-gas heat exchanger inlet guide structure according to claim 1, characterized in that: The angle of inclination of the baffle plate (3) to both sides increases sequentially, and a variable diameter flow channel is formed as the variable diameter body (102) forms.

7. The gas-to-gas heat exchanger inlet guide structure according to claim 1, characterized in that: The length of the first end of the baffle (3) within the variable diameter inlet (101) is 0.6-0.8 of the total length of the variable diameter inlet (101); the length of the last end of the baffle (3) within the variable diameter outlet (103) is 0.4-0.6 of the total length of the variable diameter outlet (103).

8. The gas-to-gas heat exchanger inlet guide structure according to claim 1, characterized in that: The baffle (3) is provided with a flow guiding structure (301) and a flow disturbance structure (302) in sequence along its extension direction.

9. The gas-to-gas heat exchanger inlet guide structure according to claim 8, characterized in that: The flow guiding structure (301) is a structure with multiple convex strips arranged at intervals along the airflow direction.

10. The gas-to-gas heat exchanger inlet guide structure according to claim 8, characterized in that: The turbulence structure (302) is a plurality of protrusions laid from the end of the flow guiding structure (301) to the end of the deflector plate (3).

Images