A VOCs exhaust gas and air mixing device for a boiler burner

Abstract

The utility model relates to a boiler burner technical field, a kind of VOCs waste gas and air mixing device for boiler burner, premixing chamber further includes: auxiliary assembly, the auxiliary assembly is set to the inner wall of premixing chamber;Wherein, auxiliary assembly includes spiral vane and spoiler, the side close to premixing chamber of spiral vane is fixedly connected with the inner wall of premixing chamber, and the spoiler is located spiral vane surface;The utility model is synergized by the surface spoiler of the helical spiral vane group of inner diameter decrement, while generating large scale spiral flow, actively stimulates numerous scale small and irregular small turbulence, realizes waste gas and air instantaneous, fully mixed, fundamentally eliminates the phenomenon of insufficient combustion, and intermittent spiral vane design significantly reduces airflow resistance, reduces the power consumption of induced draft fan, simultaneously, the use amount of auxiliary fuel is reduced by extremely high mixing and combustion efficiency, and comprehensive operating cost is significantly reduced.

Description

Technical Field

[0001] This utility model relates to the field of boiler burner technology, specifically to a mixing device for VOCs exhaust gas and air in a boiler burner. Background Technology

[0002] Direct-fired waste gas incinerators and boiler burners are among the mainstream technologies for treating volatile organic compound (VOC) waste gas. Their core principle is to decompose organic matter into carbon dioxide and water through high-temperature combustion. In this system, efficient mixing of VOCs waste gas and combustion air is a crucial prerequisite for ensuring complete combustion and meeting emission standards.

[0003] However, traditional mixing methods are too simple and crude. Most systems simply combine VOCs exhaust gas with combustion air through a three-way pipe or a simple pipeline and then send it directly into the burner. This passive mixing method relies on the kinetic energy of the gas itself, resulting in low mixing efficiency. This leads to excessively high exhaust gas concentrations and oxygen deficiency in some areas, producing incomplete combustion products such as carbon monoxide and unburned hydrocarbons. Utility Model Content

[0004] The purpose of this invention is to provide a mixing device for VOCs exhaust gas and air for boiler burners, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mixing device for VOCs exhaust gas and air for boiler burners, comprising: Premixing chamber: An auxiliary component is disposed on the inner wall of the premixing chamber; The auxiliary components include: Swirl blades, wherein the side of the swirl blades closest to the premixing chamber is fixedly connected to the inner wall of the premixing chamber; A spoiler is located on the surface of the swirl blade.

[0006] Preferably, the auxiliary component further includes: Fault grooves are formed on the surface of the swirl blades, and the swirl blades are segmented by the fault grooves.

[0007] Preferably, the auxiliary component further includes: A guide flat rod, which is a single piece, is located between the inner edges of multiple swirl blades.

[0008] Preferably, the auxiliary component further includes: The flow channel is a gas space composed of the inner diameters of multiple swirling blades.

[0009] Preferably, the swirl blades are arranged in a circular array with the axis of the premixing chamber as the origin, and the swirl blades are designed in a spiral shape.

[0010] Preferably, the three sets of swirl blades have staggered grooves to improve the smoothness of gas flow.

[0011] Preferably, the spoilers are provided in multiple and evenly distributed on the surface of each swirl blade, the setting direction of the spoilers is designed to be opposite to the gas path, and the spoilers are arranged in a bent shape.

[0012] Preferably, the gas discharge end of the premixing chamber is provided with a horizontally conical pressure hood, which can be used to increase the gas discharge flow rate.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention utilizes the synergistic effect of spiral swirling blades with decreasing inner diameter and surface baffles to generate large-scale swirling flow while actively arousing numerous small and irregular turbulent flows. This achieves instantaneous and thorough mixing of exhaust gas and air, fundamentally eliminating incomplete combustion. Furthermore, the intermittent swirling blade design significantly reduces airflow resistance and the power consumption of the induced draft fan. At the same time, the extremely high mixing and combustion efficiency reduces the amount of auxiliary fuel used, resulting in a significant reduction in overall operating costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the premixing chamber of this utility model; Figure 3 This is a schematic diagram of the auxiliary components in the premixing chamber of this utility model; Figure 4 This is a side view of the auxiliary component of this utility model. Figure 5 This is a partial structural diagram of the auxiliary component of this utility model.

[0015] In the diagram: 1. Premixing chamber; 2. Auxiliary components; 201. Swirl blades; 202. Guide flat rods; 203. Fault grooves; 204. Gas space; 205. Baffles; 3. Pressure shroud. Detailed Implementation

[0016] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0017] Please see Figure 1-5As shown, a device for mixing VOCs exhaust gas with air for boiler burners is described. It includes a premixing chamber 1 and an auxiliary component 2, with the auxiliary component 2 disposed on the inner wall of the premixing chamber 1; The aforementioned premixing chamber 1 is typically located at the front inlet of the boiler burner body, close to the front end of the burner head or nozzle; First, the VOCs exhaust gas and the combustion air are sent into the inlet of the premixing chamber 1 through pipes. At this time, they are still two separate airflows. Then, the two airflows are injected into the premixing chamber 1 through injectors. The auxiliary component 2 includes a swirl vane 201 and a baffle plate 205. The side of the swirl vane 201 closest to the premixing chamber 1 is fixedly connected to the inner wall of the premixing chamber 1, and the baffle plate 205 is located on the surface of the swirl vane 201. The airflow is forced to rotate along the spiral swirl blades 201 by the pressure behind it, forming a strong swirling field, which ensures the initial mixing of exhaust gas and air on a large scale; Multiple spoilers 205 are provided and evenly distributed on the surface of each swirl blade 201. The setting direction of the spoilers 205 is designed to be opposite to the gas path, and the spoilers 205 are bent. When the mainstream airflow collides with these tiny spoilers 205, flow separation occurs, resulting in a large number of tiny, irregular vortices behind them. These micro-vortices are the smallest units of gas mixing and can greatly increase the contact area between exhaust gas and air. Auxiliary component 2 also includes: fault groove 203, which is used to generate flow separation when the airflow passes over the surface of the swirl blade 201, forming a large number of small and irregular vortices and enhancing the turbulence intensity of the airflow. The fault groove 203 is opened on the surface of the swirl blade 201, and the swirl blade 201 is segmented through the fault groove 203. When the airflow flows along the spiral swirl blades 201, the airflow passing through the fault groove 203 will be periodically interrupted by the fault groove 203, which avoids the solidification of the flow field, violently disturbs and tears the airflow, thereby generating a large number of micron-sized small vortices. At the same time, it can also make the airflow form local stagnation in the premixing chamber 1, improving the gas mixing effect. Based on the above embodiments, the auxiliary component 2 further includes: a guide flat rod 202, used to guide the airflow from the edge to the center to promote the local airflow velocity. The guide flat rod 202 is a single piece and is located between the inner edges of multiple swirl blades 201. The aforementioned guide flat rod 202 is located at the center of rotation. When the airflow that is blown backward through the fault groove 203 comes into contact with the guide flat rod 202 behind it, the guide flat rod 202 can locally disturb the airflow and also effectively guide the airflow. Based on the above embodiments, the auxiliary component 2 further includes: a flow channel, which is used to gradually increase the airflow velocity by utilizing its gradually decreasing diameter from the inside to the outside. The flow channel is a gas space 204 composed of the inner diameters of multiple swirl blades 201. When the gas swirls on the surface of the swirl blade 201, the airflow channel narrows as the inner diameter of the swirl blade 201 decreases from the inside to the outside, and the flow velocity increases sharply. This not only enhances the shear mixing force, but also generates negative pressure locally, drawing in gas from different parts for exchange. Three swirl blades 201 are arranged in a ring array with the axis of the premixing chamber 1 as the origin, and the swirl blades 201 are spiral-shaped. The above design effectively divides the airflow into multiple streams and mixes them simultaneously, accelerating the mixing rate of exhaust gas and air and reducing incomplete combustion. Based on the above embodiment, the fault grooves 203 of the three sets of swirl blades 201 are staggered; When gas flows on the surface of the swirl blade 201, due to the design of the fault groove 203, the rapidly flowing gas will inevitably be interfered with by the fault groove 203 and form a split. However, since the three sets of fault grooves 203 are designed in an alternating manner, the airflow that is separated by the fault groove 203 in front will fall into the surface of the swirl blade 201 behind, which can not only improve the smoothness of gas flow, but also reduce the phenomenon of gas stagnation. The gas discharge end of the premixing chamber 1 is equipped with a horizontally conical pressure hood 3, which can be used to increase the gas discharge flow rate; Based on the above embodiments, after the mixing is completed, the premixed gas, after optimization treatment, is sprayed out from the nozzle or burner head of the burner. Under the high temperature environment of the boiler furnace, the mixed gas achieves near-complete combustion, VOCs are completely decomposed into CO2 and H2O, and all heat energy is released. The high-temperature flue gas generated by combustion washes over the heat exchange surface of the boiler, transferring heat to the water to produce steam or hot water, thus achieving energy recovery. After complete combustion, the pollutant content of the flue gas has been reduced to extremely low levels. After passing through possible economizers and flue gas treatment systems, it achieves clean and compliant emissions. Working principle: First, VOCs exhaust gas and combustion air are sent into the inlet of premixing chamber 1 through pipelines. At this time, they are still two separate airflows. Then, the two airflows are injected into premixing chamber 1 through injectors. Through the synergistic effect of the spiral swirl blades 201 with decreasing inner diameter and the surface baffles 205, large-scale swirls are generated while actively arousing numerous small and irregular small turbulences. This achieves instantaneous and thorough mixing of exhaust gas and air, fundamentally eliminating incomplete combustion. Furthermore, the intermittent swirl blades 201 design significantly reduces airflow resistance and reduces the power consumption of the induced draft fan. At the same time, the extremely high mixing and combustion efficiency reduces the amount of auxiliary fuel used, resulting in a significant reduction in overall operating costs.

[0018] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A device for mixing VOCs exhaust gas with air for a boiler burner, characterized in that, include: Premixing chamber (1): Auxiliary component (2), wherein the auxiliary component (2) is disposed on the inner wall of the premixing chamber (1); Among them, auxiliary component (2) includes: Swirl blade (201), the side of the swirl blade (201) near the premixing chamber (1) is fixedly connected to the inner wall of the premixing chamber (1); A spoiler (205) is located on the surface of the swirl blade (201).

2. The mixing device for VOCs exhaust gas and air for a boiler burner according to claim 1, characterized in that: The auxiliary component (2) also includes: Fault groove (203) is formed on the surface of swirl blade (201), and the swirl blade (201) is segmented by the fault groove (203).

3. The mixing device for VOCs exhaust gas and air for a boiler burner according to claim 1, characterized in that: The auxiliary component (2) also includes: The guide flat rod (202) is a single piece and is located between the inner edges of multiple swirl blades (201).

4. The mixing device for VOCs exhaust gas and air for a boiler burner according to claim 1, characterized in that: The auxiliary component (2) also includes: The flow channel is a gas space (204) formed by the inner diameter of multiple swirl blades (201).

5. The mixing device for VOCs exhaust gas and air for a boiler burner according to claim 1, characterized in that: The swirl blades (201) are arranged in a ring array with the axis of the premixing chamber (1) as the origin, and the swirl blades (201) are spiral-shaped.

6. The mixing device for VOCs exhaust gas and air for a boiler burner according to claim 2, characterized in that: The fault grooves (203) of the three sets of swirl blades (201) are staggered to improve the smoothness of gas flow.

7. The mixing device for VOCs exhaust gas and air for a boiler burner according to claim 1, characterized in that: The spoiler (205) is provided in multiple and evenly distributed on the surface of each swirl blade (201). The setting direction of the spoiler (205) is designed to be opposite to the gas path. The spoiler (205) is set in a bent shape.

8. The mixing device for VOCs exhaust gas and air for a boiler burner according to claim 1, characterized in that: The gas discharge end of the premixing chamber (1) is provided with a horizontally conical pressure hood (3), which can be used to increase the gas discharge flow rate.

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