Low-CO burner for low-temperature furnace

Abstract

The low-CO burner for the low-temperature furnace comprises a burner box body, a central auxiliary air gun, a side main air gun and a flame-fixing high-strength flame path brick, the flame-fixing high-strength flame path brick is arranged on a connecting plate at the top of the burner box body, the central auxiliary air gun enters an air channel in the flame-fixing high-strength flame path brick, and the side main air gun enters an air channel in the flame-fixing high-strength flame path brick. The top of the air channel is connected with a flame stabilizing ring groove through an arc necking opening, lateral taper holes are evenly distributed in the circumferential direction of a guide slope at the outer top of the flame-fixing high-strength flame path brick and incline upwards from outside to inside, flame stabilizing holes are evenly distributed in the circumferential direction of the flame stabilizing ring groove, and side branch air pipes of the side main air guns penetrate out of the periphery of the flame-fixing high-strength flame path brick. And a side nozzle of the side main air gun is aligned with the lateral taper hole. On the premise of stabilizing flame and reducing generation of NOx, fuel is introduced into the flame path brick, so that fuel gas is quickly mixed with air for combustion, a relatively high combustion area of the fuel is ensured at relatively low hearth temperature, complete combustion of the fuel can be promoted, the heat efficiency of the whole device is improved, and finally generation of CO is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial burners, in particular to a low-CO burner for low-temperature furnaces, which is suitable for industrial heating furnaces such as oil refining, chemical and coal chemical furnaces. Background Art

[0002] In addition to NOx, CO is also monitored in the post-combustion pollutant monitoring of the heating furnace. CO is normally produced by incomplete combustion of the fuel.

[0003] The normal furnace temperature of a conventional heating furnace is above 700°C, while the furnace temperature of a low-temperature furnace is between 300-600°C. Due to the low furnace temperature of the low-temperature furnace (≤600°C), incomplete combustion is prone to occur. In addition, methane has the highest auto-ignition temperature among combustible gases, with an auto-ignition temperature of around 640°C. This leads to the generation of a large amount of CO in the flue gas after combustion in the low-temperature furnace. Therefore, it is urgent to design a low-CO burner for low-temperature furnaces to reduce the CO content in the combustion flue gas and improve fuel utilization, thereby reducing fuel gas usage and improving the thermal efficiency of the heating furnace, ultimately saving fuel and improving economic benefits. Utility Model Content

[0004] The purpose of the present utility model is to overcome the above-mentioned shortcomings and provide a low-CO burner for a low-temperature furnace. Under the premise of stabilizing the flame and reducing the generation of NOx, the fuel is introduced into the fire channel bricks so that the fuel gas is quickly mixed with the air and burned. Thus, at a relatively low furnace temperature, a relatively high combustion area is ensured for the fuel, which can promote the complete combustion of the fuel, improve the thermal efficiency of the entire device, and ultimately reduce the generation of CO.

[0005] The purpose of this utility model is achieved in this way:

[0006] A low-CO burner for a low-temperature furnace comprises a burner housing, a central auxiliary air gun, a side main air gun and solid flame high-strength flue bricks, wherein the solid flame high-strength flue bricks are arranged on a connecting plate at the top of the burner housing, the central auxiliary air gun passes through the burner housing and enters the air channel in the solid flame high-strength flue bricks, the top of the air channel is connected to a flame-stabilizing ring groove through an arc necking, the guide inclined surface on the outer top of the solid flame high-strength flue brick is circumferentially evenly distributed with lateral tapered holes, the lateral tapered holes are inclined upward from the outside to the inside, the flame-stabilizing ring groove is circumferentially evenly distributed with flame-stabilizing holes, the side branch pipe of the side main air gun passes through the burner housing and out from the outer periphery of the solid flame high-strength flue bricks, and the side nozzle of the side main air gun is aligned with the lateral tapered hole.

[0007] Preferably, a plurality of side nozzles are distributed circumferentially outside the solid flame high-strength flue bricks, and the side nozzles correspond to the lateral tapered holes one by one.

[0008] Preferably, the outlet of the lateral tapered hole is arranged below the arc-shaped necking.

[0009] Preferably, the flame-stabilizing holes include vertical flame-stabilizing holes and horizontal flame-stabilizing holes, the outlets of the vertical flame-stabilizing holes face the top surface of the flame-fixing high-strength flue brick, and the outlets of the horizontal flame-stabilizing holes face the guide slope.

[0010] Preferably, the side nozzle sprays fuel gas to the lateral cone hole and the guide slope at the same time.

[0011] The beneficial effects of the utility model are:

[0012] The fuel gas from the central auxiliary air gun is sprayed into the flame stabilizing hole groove on the solid flame high-strength fire channel brick, burning all the ends of the fire channel brick red, forming the first layer of flame area; a part of the fuel gas from the side main air gun is sprayed into the middle space of the fire channel brick through the side tapered hole of the solid flame high-strength fire channel brick to burn, forming the second layer of flame area, and finally forming a strong flame at the root, so that the fuel of the side main air gun is sprayed into the area with higher peak flame temperature. Finally, even if the furnace temperature is low, the fuel gas can be burned as quickly as possible in a higher temperature environment, reducing the amount of CO generated;

[0013] The arc shrinkage of the solid flame high-strength fire channel bricks enhances resistance and increases the flow rate at the throat of the fire channel bricks, strengthens the mixing of fuel gas and air, and helps the combustible gas to burn and react as quickly as possible. At the same time, the lateral tapered holes on the solid flame high-strength fire channel bricks introduce part of the flue gas after combustion, which can increase the reaction starting temperature and effectively reduce the amount of CO generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural schematic diagram of a low-CO burner for a low-temperature furnace according to the present invention.

[0015] Figure 2 for Figure 1 A-direction view.

[0016] Figure 3 This is a schematic diagram of the three-dimensional structure of the solid flame high-strength fire channel brick.

[0017] Figure 4 for Figure 1 A partial enlarged view of the Zhongguyan high-strength fire channel brick.

[0018] The burner comprises: a burner housing 1; a housing panel 1.1; an air inlet duct 1.2; a housing 1.3; a connecting plate 1.4; a central auxiliary air gun 2; a fuel gas inlet 2.1; a central gun barrel 2.2; a central nozzle 2.3; a side main air gun 3; a gas inlet short connector 3.1; a disc-shaped distribution pipe 3.2; a side branch pipe 3.3; a side nozzle 3.4; a flame-stabilizing high-strength fire channel brick 4; a side through-hole groove 4.1; a lateral tapered hole 4.2; a flame-stabilizing horizontal hole 4.3; a flame-stabilizing annular groove 4.4; a flame-stabilizing vertical hole 4.5; an arc-shaped reduction opening 4.6; a guide slope 4.7; and an air passage 4.8. DETAILED DESCRIPTION

[0019] See also Figure 1-4The utility model relates to a low-CO burner for a low-temperature furnace, comprising a burner box 1, a central auxiliary air gun 2, a side main air gun 3 and a solid flame high-strength fire channel brick 4. The side of the burner box 1 is provided with an inlet for combustion-supporting air. The burner box 1 comprises a box panel 1.1, an air inlet duct 1.2, a cylinder 1.3 and a connecting plate 1.4. The bottom of the cylinder 1.2 is provided with a box panel 1.1, and the top is provided with a connecting plate 1.4 connected to the low-temperature furnace. The air inlet duct 1.2 for the entry of combustion-supporting air is arranged on the side of the cylinder 1.3. The solid flame high-strength fire channel brick 4 is used to reduce the CO of the low-temperature furnace. The core component is arranged on the connecting plate 1.4. An air channel 4.8 is provided in the solid flame high-strength flue brick 4. The top of the air channel 4.8 is connected to the flame-stabilizing ring groove 4.4 through an arc necking 4.6. The top of the solid flame high-strength flue brick 4 is provided with a guide slope 4.7. The bottom of the guide slope 4.7 is circumferentially evenly distributed with lateral tapered holes 4.2. The lateral tapered holes 4.2 are inclined upward from outside to inside. The flame-stabilizing ring groove 4.4 is circumferentially evenly distributed with flame-stabilizing holes. Each flame-stabilizing hole is connected to the flame-stabilizing ring groove 4.4. The outlet of the lateral tapered hole 4.2 is arranged below the arc necking 4.6.

[0020] The flame stabilizing holes include vertical flame stabilizing holes 4.5 and horizontal flame stabilizing holes 4.3. The outlets of the vertical flame stabilizing holes 4.5 face the top surface of the flame-fixing high-strength flue brick 4, and the outlets of the horizontal flame stabilizing holes 4.3 face the guide slope 4.7.

[0021] The central auxiliary air gun 2 is used to heat the solid flame high-strength flue bricks 4. The central auxiliary air gun 2 is arranged at the center of the burner box 1. The central auxiliary air gun 2 passes through the burner box 1 and enters the air channel 4.8 in the solid flame high-strength flue bricks 4. The central auxiliary air gun 2 includes a fuel gas inlet 2.1, a central gun barrel 2.2 and a central nozzle 2.3.

[0022] The side main gas gun 3 is used to heat the low-temperature furnace and is key to meeting the low-nitrogen principle and reducing NOx. The side main gas gun 3 includes a gas inlet short connector 3.1, a disc-shaped distribution pipe 3.2, a side branch pipe 3.3, and a side nozzle 3.4. The disc-shaped distribution pipe 3.2 is installed on the box panel 1.1. Gas enters the disc-shaped distribution pipe 3.2 from the gas inlet short connector 3.1. The disc-shaped distribution pipe 3.2 is connected to multiple side branches 3.3, each of which is connected to a side nozzle 3.4. The side branch pipe 3.3 passes from the burner box 1 through the side through-hole groove 4.1 on the outer periphery of the solid flame high-strength flue brick 4. Multiple side nozzles 3.4 are distributed circumferentially outside the solid flame high-strength flue brick 4, and the side nozzles correspond one-to-one with the lateral tapered holes. The side nozzle has a special injection hole. Part of the fuel gas from the side nozzle is sprayed into the solid flame high-strength fire channel brick through the side cone hole for combustion, and the other part of the fuel gas is sprayed along the guide slope to the center of the solid flame high-strength fire channel brick for combustion.

[0023] Working principle:

[0024] The stable flame ring groove and the stable flame hole at the top of the solid flame high-strength flue brick improve the peak temperature at the root of the flame, promote the combustion reaction of the fuel gas in a relatively high temperature field, the circular arc neck of the solid flame high-strength flue brick enhances the resistance and improves the flow velocity of the throat of the flue brick, strengthens the mixing of the fuel gas and air, helps the combustible gas to burn as soon as possible, and the lateral taper hole on the solid flame high-strength flue brick introduces part of the flue gas after combustion, which can improve the reaction starting temperature, thereby effectively reducing the CO generation amount.

[0025] In addition to the above-mentioned embodiments, the utility model also includes other implementation manners, and the technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the utility model claims.

Claims

1. A low-CO burner for a low-temperature furnace, comprising a burner housing, a central auxiliary air gun, a side main air gun, and solid flame high-strength flue bricks, wherein the solid flame high-strength flue bricks are arranged on a connecting plate at the top of the burner housing, characterized in that: The central auxiliary air gun passes through the burner box and enters the air channel inside the solid flame high-strength fire channel brick. The top of the air channel is connected to the flame-stabilizing ring groove through an arc necking. The guide slope on the outer top of the solid flame high-strength fire channel brick is evenly distributed with lateral tapered holes. The lateral tapered holes are inclined upward from the outside to the inside. The flame-stabilizing ring groove is evenly distributed with flame-stabilizing holes. The side branch pipe of the side main air gun passes through the burner box and exits from the outer periphery of the solid flame high-strength fire channel brick. The side nozzle of the side main air gun is aligned with the lateral tapered hole.

2. The low CO burner for a low temperature furnace according to claim 1, characterized in that: A plurality of side nozzles are distributed circumferentially outside the solid flame high-strength fire channel bricks, and the side nozzles correspond to the lateral tapered holes one by one.

3. The low CO burner for a low temperature furnace according to claim 1, characterized in that: The outlet of the lateral tapered hole is arranged below the arc-shaped contraction.

4. The low CO burner for a low temperature furnace according to claim 1, characterized in that: The flame stabilizing holes include vertical flame stabilizing holes and horizontal flame stabilizing holes. The outlets of the vertical flame stabilizing holes face the top surface of the flame-fixing high-strength fire channel bricks, and the outlets of the horizontal flame stabilizing holes face the guiding inclined surface.

5. The low CO burner for a low temperature furnace according to claim 1, characterized in that: The side nozzle sprays fuel gas to the lateral tapered hole and the guide inclined surface simultaneously.

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