High and low temperature air mixing device

Abstract

This utility model relates to the technical field of flue gas exhaust mixing devices, and more particularly to high and low temperature mixing devices. It includes a mixing component for mixing high and low temperature flue gas, a flow guiding component for guiding flue gas flow within the mixing component, and a control component for flue gas temperature regulation outside the mixing component. The mixing component includes a housing and a sealing plate located on the surface of the housing. This utility model, through the coordinated operation of the mixing component and the flow guiding component, enables the high and low temperature flue gas to form a multi-stage mixing path within the housing. The vertical arrangement of the inlet and outlet baffles forms a head-and-tail flow obstruction structure, which, combined with the staggered flow guiding surface formed by the first and second inclined plates, forces the flue gas to flow along an S-shaped trajectory, effectively extending the mixing time and increasing the contact area. A temperature sensor monitors the temperature inside the housing and at each interface in real time, transmitting the data to a PLC controller. When an abnormal temperature is detected, the controller automatically adjusts the opening of the electric regulating valve to precisely control the ratio of high and low temperature flue gas intake.

Description

Technical Field

[0001] This utility model relates to the technical field of flue gas exhaust mixing devices, and in particular to high and low temperature mixing devices. Background Technology

[0002] In the field of industrial organic waste gas treatment, regenerative thermal oxidizers (RTOs) are widely used in industries such as chemical and coating due to their high VOCs removal rate and good heat recovery performance. The principle is to preheat the low-temperature VOCs-containing waste gas and send it into the high-temperature combustion chamber for oxidation and decomposition. The high-temperature flue gas flows through the heat storage body to recover heat energy and is discharged at a low temperature. In actual operation, when the temperature of the RTO system exceeds the upper limit, the heat bypass valve will be opened to mix the high-temperature flue gas with the low-temperature exhaust gas. If it is directly discharged into the air, it will cause heat energy waste. Therefore, existing RTO systems are equipped with a total heat hot water recovery heat exchanger at the tail end to use waste heat to heat cold water to produce high-temperature hot water, thereby improving energy utilization efficiency.

[0003] However, the temperature resistance limit of commonly used waste heat recovery heat exchanger tubes is about 250℃. If the high and low temperature flue gas is not fully mixed before entering the heat exchanger, it will lead to accidents such as overheating and deformation of the heat exchange tubes. Moreover, due to spatial layout limitations, it is difficult to mix the high and low temperature flue gas evenly. Traditional methods cannot solve the problem of uneven velocity field and temperature field, resulting in low mixing efficiency of high and low temperature flue gas.

[0004] Therefore, to address the problem of uneven mixing of high and low temperature flue gas in the existing technology, a high and low temperature mixing device needs to be designed between the flue gas exhaust and the heat exchanger. By optimizing the aerodynamic structure, the high and low temperature flue gas can be mixed evenly, ensuring that the flue gas temperature field is uniform and controllable, improving operational safety, extending equipment life, and maximizing waste heat utilization efficiency. Utility Model Content

[0005] In order to overcome the existing problem of uneven mixing of high and low temperature flue gas.

[0006] The technical solution of this utility model is as follows: a high and low temperature mixing device, including a mixing component for mixing high and low temperature flue gas, a flow guiding component for guiding flue gas flow inside the mixing component, and a control component for regulating flue gas temperature outside the mixing component. The mixing component includes a housing, a sealing plate located on the surface of the housing, a high temperature air inlet located at the top of the housing, and low temperature air inlets and mixed gas outlets located on both sides of the housing. The flow guiding component includes an air inlet baffle located on one side inside the housing, an air outlet baffle located on the other side inside the housing, a first inclined plate located at the lower end inside the housing, and a second inclined plate located at the upper end inside the housing.

[0007] Preferably, the high and low temperature flue gas enter the inner cavity of the housing through the high temperature inlet and the low temperature inlet, respectively. After entering the inner cavity, the flue gas is first blocked by the inlet baffle, causing the high and low temperature airflows to mix initially. As the flue gas flows in the inner cavity, it is guided by the first and second inclined plates, causing it to mix again. The mixed flue gas is blocked again by the outlet baffle. Under the synergistic action of the inlet baffle, the outlet baffle, the first inclined plate, and the second inclined plate, the high and low temperature flue gas form an S-shaped flow in the inner cavity of the housing, thereby completing the mixing and entering the rear heat exchanger through the mixed gas outlet.

[0008] Preferably, the high-temperature air inlet, the low-temperature air inlet, and the mixed gas outlet are all connected to the inner cavity of the housing, with the low-temperature air inlet located at the upper end of one side of the housing and the mixed gas outlet located at the lower end of one side of the housing.

[0009] Preferably, the end of the high-temperature air inlet port away from the housing is connected to a high-temperature air inlet pipe, the end of the low-temperature air inlet port away from the housing is connected to a low-temperature air inlet pipe, and the end of the mixed gas outlet port away from the housing is connected to a mixed gas outlet pipe.

[0010] Preferably, the surface of the sealing plate is provided with an observation window, and the inner cavity of the observation window is inlaid with transparent high-temperature resistant glass. The sealing plate is fixedly connected to the box body by bolts.

[0011] Preferably, the air inlet baffle is fixed to the top of the inner cavity of the box and close to the air inlet of the high temperature air inlet and the low temperature air inlet; the air outlet baffle is fixed to the bottom of the inner cavity of the box and close to the connection between the mixed gas outlet and the box; the first inclined plate is fixed to the inner cavity of the box and located below the air inlet of the high temperature air inlet and the low temperature air inlet; and the second inclined plate is fixed to the top of the inner cavity of the box and located above the air outlet baffle.

[0012] Preferably, the control components include a PLC controller for regulation, a temperature sensor for temperature monitoring, and an electric regulating valve for flue gas flow control. The output terminal of the temperature sensor is electrically connected to the input terminal of the PLC controller, and the output terminal of the PLC controller is electrically connected to the input terminal of the electric regulating valve.

[0013] Preferably, temperature sensors are provided on the surfaces of the inner cavity of the housing, the high-temperature air inlet, the low-temperature air inlet, and the mixed gas outlet, and electric regulating valves are provided on the surfaces of the high-temperature air inlet pipe, the low-temperature air inlet pipe, and the mixed gas outlet pipe.

[0014] The beneficial effects of this utility model are as follows: Through the coordinated cooperation of the mixing component and the flow guiding component, high and low temperature flue gas forms a multi-stage mixing path in the chamber. The vertical arrangement of the inlet baffle and the outlet baffle forms a head-and-tail flow obstruction structure. Combined with the staggered flow guiding surface formed by the first and second inclined plates, the flue gas is forced to flow along an S-shaped trajectory, effectively extending the mixing time and increasing the contact area. The temperature sensor monitors the temperature inside the chamber and at each interface in real time and transmits the data to the PLC controller. When an abnormal temperature is detected, the controller automatically adjusts the opening of the electric regulating valve to accurately control the ratio of high and low temperature flue gas intake. Through the dual protection of pneumatic structure optimization and temperature control, the temperature fluctuation range of the mixed flue gas is effectively controlled, which not only avoids overheating and deformation of the heat exchange pipes, but also ensures the uniformity of the flue gas temperature entering the heat exchanger, significantly improving the waste heat recovery efficiency and operational stability. Attached Figure Description

[0015] Figure 1 The diagram shown is a front-view three-dimensional structural schematic of this utility model; Figure 2 The diagram shown is a front cross-sectional view of the hybrid component of this utility model. Figure 3 The diagram shown is a three-dimensional structural schematic of the hybrid component and the control component of this utility model. Figure 4 The diagram shown is a three-dimensional structural diagram of the internal structure of the box of this utility model.

[0016] Explanation of reference numerals in the attached drawings: 100, mixing component; 110, housing; 120, sealing plate; 130, high-temperature air inlet; 140, low-temperature air inlet; 150, mixed gas outlet; 160, observation window; 170, high-temperature air inlet pipe; 180, low-temperature air inlet pipe; 190, mixed gas outlet pipe; 200, flow guiding component; 210, air inlet baffle; 220, air outlet baffle; 230, first inclined plate; 240, second inclined plate; 300, control component; 310, PLC controller; 320, temperature sensor; 330, electric regulating valve. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Example 1 Please see Figures 1-4This utility model provides an embodiment of a high-low temperature mixing device, including a mixing component 100 for mixing high and low temperature flue gas, a flue gas guiding component 200 disposed inside the mixing component 100, and a flue gas temperature control component 300 disposed outside the mixing component 100. The mixing component 100 includes a housing 110, a sealing plate 120 located on the surface of the housing 110, a high temperature air inlet 130 located at the top of the housing 110, and low temperature air inlets 140 located on both sides of the housing 110 and a mixed gas outlet. The air inlet 150 and the flow guiding assembly 200 include an air inlet baffle 210 located on one side inside the housing 110, an air outlet baffle 220 located on the other side inside the housing 110, a first inclined plate 230 located at the lower end inside the housing 110, and a second inclined plate 240 located at the upper end inside the housing 110. The high-temperature air inlet 130, the low-temperature air inlet 140, and the mixed gas outlet 150 are all connected to the inner cavity of the housing 110. The low-temperature air inlet 140 is located at the upper end of one side of the housing 110, and the mixed gas outlet 150... Located at the lower end of one side of the enclosure 110, the high-temperature air inlet 130 is connected to a high-temperature air inlet pipe 170 at the end furthest from the enclosure 110, the low-temperature air inlet 140 is connected to a low-temperature air inlet pipe 180 at the end furthest from the enclosure 110, and the mixed gas outlet 150 is connected to a mixed gas outlet pipe 190 at the end furthest from the enclosure 110. An observation window 160 is provided on the surface of the sealing plate 120, and the inner cavity of the observation window 160 is inlaid with transparent high-temperature resistant glass. The sealing plate 120 is fixedly connected to the enclosure 110 by bolts. The air intake baffle 210 is fixed to the top of the inner cavity of the housing 110 and is close to the air intake of the high temperature air intake port 130 and the low temperature air intake port 140. The air outlet baffle 220 is fixed to the bottom of the inner cavity of the housing 110 and is close to the connection between the mixed gas outlet port 150 and the housing 110. The first inclined plate 230 is fixed to the inner cavity of the housing 110 and is located below the air intake of the high temperature air intake port 130 and the low temperature air intake port 140. The second inclined plate 240 is fixed to the top of the inner cavity of the housing 110 and is located above the air outlet baffle 220.

[0019] During operation, high-temperature flue gas enters the top area of ​​the housing 110 through the high-temperature inlet pipe 170 and the high-temperature inlet port 130. Simultaneously, low-temperature flue gas is input through the low-temperature inlet pipe 180 from the low-temperature inlet port 140 at the upper side of the housing 110. The two flue gases of different temperatures are spatially staggered, providing initial conditions for subsequent uniform mixing. The inlet baffle 210 is located near the high-temperature and low-temperature inlets, at the top of the housing 110's inner cavity. Its function is to deflect the airflow downwards, creating initial turbulence. The first inclined plate 230 is located directly below the inlet, angled to further disperse the airflow direction, promote lateral convergence of the high-temperature and low-temperature gases, increase turbulence intensity, and improve the heat exchange rate. The second inclined plate 240 is located above the outlet baffle 220 and fixed to the top of the housing 110, forming an upper recirculation zone. After some of the rising airflow is obstructed, it flows in the opposite direction, prolonging the residence time of the flue gas in the chamber 110 and improving the mixing uniformity. The outlet baffle 220 is fixed at the bottom of the chamber 110, near the mixed gas outlet 150, which can prevent the unmixed mainstream from being directly short-circuited and discharged, forcing the airflow to detour and converge through the lower channel, realizing the retention and redistribution effect. The mixed flue gas is finally discharged from the mixed gas outlet 150 at the lower end of one side of the chamber 110, and is transported to the heat exchanger via the mixed gas outlet pipe 190. The mixing of the flue gas in the chamber 110 can be directly observed through the transparent high-temperature resistant glass embedded in the inner cavity of the observation window 160, so as to adjust the relevant parameters in time. The top-inlet and side-outlet layout, combined with the internal guide structure, forms a top-down, spiral reciprocating airflow path, which significantly improves the mixing uniformity and response speed.

[0020] Example 2 Please see Figure 1 and Figure 3 The difference from Embodiment 1 is that the control component 300 includes a PLC controller 310 for regulation, a temperature sensor 320 for temperature monitoring, and an electric regulating valve 330 for flue gas flow control. The output terminal of the temperature sensor 320 is electrically connected to the input terminal of the PLC controller 310, and the output terminal of the PLC controller 310 is electrically connected to the input terminal of the electric regulating valve 330. Temperature sensors 320 are provided on the inner cavity of the housing 110, the surface of the high-temperature air inlet 130, the low-temperature air inlet 140, and the mixed gas outlet 150. Electric regulating valves 330 are provided on the surface of the high-temperature air inlet pipe 170, the low-temperature air inlet pipe 180, and the mixed gas outlet pipe 190.

[0021] During operation, the temperature sensor 320 can monitor the temperature of the inner cavity of the housing 110, the high-temperature air inlet 130, the low-temperature air inlet 140, and the mixed gas outlet 150 in real time, and transmit the monitored temperature signal to the PLC controller 310. The PLC controller 310 analyzes and processes the received temperature signal, and then outputs a control signal to the electric regulating valve 330. The electric regulating valve 330 automatically adjusts the opening of the high-temperature air inlet pipe 170, the low-temperature air inlet pipe 180, and the mixed gas outlet pipe 190 according to the control signal, thereby realizing precise control of the flow rate of high-temperature gas and low-temperature gas, as well as the regulation of the flow rate of mixed gas, to ensure that the high-low temperature air mixing device can operate stably and efficiently, and meet the requirements of mixed gas temperature and flow rate under different working conditions.

[0022] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A high-low temperature mixing device, comprising a mixing component (100) for mixing high and low temperature flue gas, a flue gas guiding component (200) disposed within the mixing component (100) for guiding flue gas flow, and a flue gas temperature control component (300) disposed outside the mixing component (100), characterized in that: The mixing assembly (100) includes a housing (110), a sealing plate (120) on the surface of the housing (110), a high-temperature air inlet (130) on the top of the housing (110), and low-temperature air inlets (140) and mixed gas outlets (150) on both sides of the housing (110). The flow guiding assembly (200) includes an air inlet baffle (210) on one side inside the housing (110), an air outlet baffle (220) on the other side inside the housing (110), a first inclined plate (230) at the lower end inside the housing (110), and a second inclined plate (240) at the upper end inside the housing (110).

2. The high and low temperature air mixing device according to claim 1, characterized in that: The high-temperature air inlet (130), low-temperature air inlet (140) and mixed gas outlet (150) are all connected to the inner cavity of the housing (110). The low-temperature air inlet (140) is located at the upper end of one side of the housing (110), and the mixed gas outlet (150) is located at the lower end of one side of the housing (110).

3. The high and low temperature mixing air device according to claim 1, characterized in that: The high-temperature air inlet (130) is connected to a high-temperature air inlet pipe (170) at the end away from the housing (110), the low-temperature air inlet (140) is connected to a low-temperature air inlet pipe (180) at the end away from the housing (110), and the mixed gas outlet (150) is connected to a mixed gas outlet pipe (190) at the end away from the housing (110).

4. The high and low temperature mixing air device according to claim 1, characterized in that: The sealing plate (120) has an observation window (160) on its surface, and the inner cavity of the observation window (160) is inlaid with transparent high-temperature resistant glass. The sealing plate (120) is fixedly connected to the box body (110) by bolts.

5. The high and low temperature air mixing device according to claim 1, characterized in that: The air intake baffle (210) is fixed to the top of the inner cavity of the box (110) and close to the air intake of the high temperature air intake port (130) and the low temperature air intake port (140). The air outlet baffle (220) is fixed to the bottom of the inner cavity of the box (110) and close to the connection between the mixed gas outlet port (150) and the box (110). The first inclined plate (230) is fixed to the inner cavity of the box (110) and located below the air intake of the high temperature air intake port (130) and the low temperature air intake port (140). The second inclined plate (240) is fixed to the top of the inner cavity of the box (110) and located above the air outlet baffle (220).

6. The high and low temperature mixing air device according to claim 3, characterized in that: The control component (300) includes a PLC controller (310) for regulation, a temperature sensor (320) for temperature monitoring, and an electric regulating valve (330) for flue gas flow control. The output of the temperature sensor (320) is electrically connected to the input of the PLC controller (310), and the output of the PLC controller (310) is electrically connected to the input of the electric regulating valve (330).

7. The high and low temperature mixing air device according to claim 6, characterized in that: Temperature sensors (320) are provided on the inner cavity of the housing (110), the surface of the high temperature air inlet (130), the low temperature air inlet (140) and the mixed gas outlet (150), and electric regulating valves (330) are provided on the surface of the high temperature air inlet pipe (170), the low temperature air inlet pipe (180) and the mixed gas outlet pipe (190).

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