Multi-burner air distribution device for large vacuum boiler

Abstract

The utility model provides a multi-burner air distribution device for a large vacuum boiler, which comprises a base and a boiler, the boiler is fixed at the upper end of the base, the side edge of the boiler is provided with an air distribution device, the air distribution device comprises a fan and an air distribution pipe, the fan is fixed on the base, the left side of the air distribution pipe is connected with the output end of the fan, and the right side of the air distribution pipe is connected with the output end of the fan. The combustor is arranged on the side edge of the boiler and is communicated with the interior of the boiler; a flue gas pipeline is arranged on the right side of the boiler, flue gas after combustion and high-temperature flue gas at the tail of the boiler are sucked into an air inlet of a fan through the flue gas pipeline through the flue gas pipeline, mixed with combustion-supporting air and then enter a hearth to be continuously combusted, so that the temperature of a combustion area is reduced, and meanwhile, the oxygen concentration of the combustion area is reduced; and finally, the generation amount of thermal oxynitride is reduced, the utilization efficiency of the high-temperature flue gas can be improved, the emission amount of oxynitride discharged by the boiler can be reduced, and the environment is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, in particular to a multi-burner air distribution device for a large vacuum boiler. Background Art

[0002] A vacuum boiler is a hot water boiler, also called a vacuum water heater. It is mainly used for civil heating, and can be applied to heating and sanitary hot water heating in hotels, residential areas, commercial places and other places. A vacuum boiler forms a negative pressure vacuum environment inside a closed furnace body, fills the body with heat medium water, heats the heat medium water by combustion or other means, and the heat medium water is heated to generate steam. The steam heats the water in the heat exchanger tube through condensation heat exchange, thus realizing the supply of hot water.

[0003] The existing Chinese patent document CN202223158871.5 discloses a fully automatic blower feeder for a biomass-fired boiler, including a double hopper, a variable frequency blower connected to the bottom of the double hopper, an air distribution device connected to the bottom of the variable frequency blower, an air inlet duct connected to the bottom of one end of the air distribution device, a variable frequency feeding blower installed at the bottom of the air inlet duct, a spray pipe connected to the other end of the air distribution device, a spray nozzle installed at the outer end of the spray pipe, the air distribution device is a three-way structure with a hollow interior, and is connected to the double hoppers at the top, one horizontal end is connected to the air inlet duct, and the other horizontal end is connected to the spray pipe. The biomass-fired boiler is equipped with a fully automatic blower feeder, which uses double hoppers and double specially designed spray nozzles. The boiler furnace is automatically and evenly fed with materials through variable frequency blower and spray nozzles. Both hoppers are designed with long sight mirrors to monitor the changes in the material levels of the double hoppers at all times. The double hopper covers adopt a sealed compression structure, and the double hopper feeding can be realized on the left and right, which is convenient to use.

[0004] However, the above patent has certain defects when in use. The flue gas discharged from the air distribution device not only has high heat but also carries pollutants. Direct discharge causes environmental pollution and heat loss, thereby reducing economic benefits.

[0005] For this reason, a multi-burner air distribution device for large vacuum boilers is proposed to solve the above-mentioned problems. Utility Model Content

[0006] In order to overcome the deficiencies of the prior art, the utility model provides a multi-burner air distribution device for a large vacuum boiler.

[0007] The utility model is implemented by the following technical solutions:

[0008] A multi-burner air distribution device for a large vacuum boiler, comprising a base and a boiler, wherein the boiler is fixed on the upper end of the base, and an air distribution device is arranged on the side of the boiler, wherein the air distribution device comprises a fan and an air distribution pipe, wherein the fan is fixed on the base, and the left side of the air distribution pipe is connected to the output end of the fan, and the right side is connected to the burner, wherein the burner is arranged on the side of the boiler and is connected to the inside of the boiler;

[0009] A flue gas duct is provided on the right side of the boiler. The flue gas duct extends from the exhaust position at the rear of the boiler to the outside of the boiler and is finally connected to the air inlet of the fan.

[0010] The air distribution pipe includes an air distribution main pipe and an air distribution branch pipe, and three air distribution branch pipes are provided, namely, a first air distribution branch pipe, a second air distribution branch pipe and a third air distribution branch pipe;

[0011] One end of the air distribution branch pipe is connected to the air distribution main pipe, and the other end is provided with an air distribution cover, and the air distribution cover is connected to the burner.

[0012] The flue gas duct is provided with a filter tank, which includes a duct body. Two filter screens are arranged inside the duct body. The filter screens divide the interior into three areas. The middle area is a drying chamber. The left and right areas are filled with activated carbon. The drying chamber is filled with desiccant.

[0013] The outside of the filter tank is provided with a heat-insulating layer.

[0014] An inspection port is arranged on the surface of the filter tank.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. By setting up a flue gas duct, the flue gas after combustion, about 10% to 30% of the high-temperature flue gas at the tail of the boiler, is sucked into the air inlet of the fan through the flue gas duct, mixed with the combustion-supporting air and then enters the furnace to continue burning, thereby reducing the temperature of the combustion area and the oxygen concentration in the combustion area, and finally reducing the generation of thermal nitrogen oxides, which can not only improve the utilization efficiency of high-temperature flue gas, but also reduce the emission of nitrogen oxides from the boiler and protect the environment;

[0017] 2. By setting up the air distribution duct, the fan draws external air into the air distribution device, and transports it to the air distribution branch pipe through the air distribution main pipe. The air distribution branch pipe simultaneously divides the oxygen into three parts and sends them into the burner for combustion. Combustion is carried out in multiple directions, thereby improving the internal thermal efficiency of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the front side of the utility model;

[0019] Figure 2 This is a schematic diagram of the overall structure of the utility model from a top view;

[0020] Figure 3 It is a side structural schematic diagram of the utility model;

[0021] Figure 4 This is a schematic diagram of the air distribution duct structure of the utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the filter tank of the utility model;

[0023] In the figure: 1. base; 2. fan; 21. air inlet; 3. air distribution duct; 31. air distribution main pipe; 32. second air distribution branch pipe; 33. first air distribution branch pipe; 34. third air distribution branch pipe; 35. air distribution hood; 5. flue gas duct; 6. filter tank; 61. inspection port; 62. activated carbon; 63. pipe body; 64. insulation layer; 65. desiccant; 66. drying chamber; 67. filter. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0025] The utility model is further described below in conjunction with the accompanying drawings.

[0026] like Figures 1 to 3 As shown, a multi-burner air distribution device for a large vacuum boiler comprises a base 1 and a boiler, wherein the boiler is fixed on the upper end of the base 1, and an air distribution device is arranged on the side of the boiler, wherein the air distribution device comprises a fan 2 and an air distribution pipe 3, wherein the fan 2 is fixed on the base 1, and the air distribution pipe 3 is connected to the output end of the fan 2 on the left side and to the burner on the right side, wherein the burner is arranged on the side of the boiler and is connected to the inside of the boiler, and a flue gas duct 5 is arranged on the right side of the boiler, wherein the flue gas duct 5 extends from the exhaust position at the rear of the boiler to the outside of the boiler, and is finally connected to the air inlet 21 of the fan 2, and a filter tank 6 is arranged on the flue gas duct 5, and the flue gas duct 5 adopts a built-in pipe design, with bidirectional support at the front and rear ends and a standard flange interface, so as to facilitate installation by users.

[0027] like Figure 4 As shown, the air distribution pipe 3 includes an air distribution main pipe 31 and an air distribution branch pipe. There are three air distribution branch pipes, namely a first air distribution branch pipe 33, a second air distribution branch pipe 32 and a third air distribution branch pipe 34;

[0028] One end of the air distribution branch pipe is connected to the air distribution main pipe 31, and the other end is provided with an air distribution cover 35, and the air distribution cover 35 is connected to the burner. A large vacuum boiler is equipped with an air distribution device, and only one fan 2 is used for air distribution at the same time, which occupies a small area and has high efficiency.

[0029] like Figure 5 As shown, the filter tank 6 includes a pipe body 63, and two filter screens 67 are arranged inside the pipe body 63. The filter screens 67 divide the interior into three areas. The middle area is a drying chamber 66, and the left and right areas are filled with activated carbon 62. The drying chamber 66 is filled with desiccant 65. Because the returned high-temperature flue gas contains a certain amount of saturated water vapor, condensed water will be generated after cooling. Therefore, the flue gas pipe 5 adopts a stainless steel pipe, and the desiccant 65 is arranged inside the filter tank 6 to absorb the water vapor in the flue gas, thereby preventing corrosion and extending the service life.

[0030] The outside of the filter tank 6 is provided with a heat-insulating layer 64, and the external heat-insulating layer 64 has a heat-insulating effect on the flue gas duct 5, thereby slowing down the loss of heat of the flue gas.

[0031] The surface of the filter tank 6 is provided with an inspection port 61 , which facilitates the inspection of the filter tank 6 and the replacement of the desiccant 65 .

[0032] The working principle of the utility model is as follows: when in use, the fan 2 draws external air into the air distribution device, and delivers it to the air distribution branch pipe through the air distribution main pipe 31. The air distribution branch pipe simultaneously divides oxygen into three parts and delivers them to the burner for combustion. The combustion is carried out in multiple directions, thereby improving the internal thermal efficiency of the boiler;

[0033] The flue gas after combustion, about 10% to 30% of the high-temperature flue gas at the tail of the boiler, is sucked into the air inlet 21 of the fan 2 through the flue gas duct 5, mixed with the combustion-supporting air and then enters the furnace to continue burning, thereby reducing the temperature of the combustion area and the oxygen concentration in the combustion area, and ultimately reducing the generation of thermal nitrogen oxides, which can not only improve the utilization efficiency of high-temperature flue gas, but also reduce the emission of nitrogen oxides from the boiler and protect the environment.

[0034] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A multi-burner air distribution device for a large vacuum boiler, comprising a base (1) and a boiler, wherein the boiler is fixed to the upper end of the base (1), characterized in that: An air distribution device is provided on the side of the boiler, the air distribution device comprises a fan (2) and an air distribution pipe (3), the fan (2) is fixed on the base (1), the air distribution pipe (3) is connected to the output end of the fan (2) on the left side and to the burner on the right side, the burner is arranged on the side of the boiler and is connected to the inside of the boiler; A flue gas duct (5) is provided on the right side of the boiler. The flue gas duct (5) extends from the exhaust position at the rear of the boiler to the outside of the boiler and is ultimately connected to the air inlet (21) of the fan (2).

2. The multi-burner air distribution device for a large vacuum boiler according to claim 1, characterized in that: The air distribution pipe (3) comprises an air distribution main pipe (31) and an air distribution branch pipe, wherein three air distribution branch pipes are provided, namely, a first air distribution branch pipe (33), a second air distribution branch pipe (32) and a third air distribution branch pipe (34); One end of the air distribution branch pipe is connected to the air distribution main pipe (31), and the other end is provided with an air distribution cover (35), and the air distribution cover (35) is connected to the burner.

3. The multi-burner air distribution device for a large vacuum boiler according to claim 2, characterized in that: The flue gas duct (5) is provided with a filter tank (6), the filter tank (6) comprising a duct body (63), two filter screens (67) being provided inside the duct body (63), the filter screens (67) dividing the interior into three areas, the middle area being a drying chamber (66), the left and right areas being filled with activated carbon (62), and the drying chamber (66) being filled with a desiccant (65).

4. The multi-burner air distribution device for a large vacuum boiler according to claim 3, characterized in that: The outside of the filter tank (6) is provided with a heat-insulating layer (64).

5. The multi-burner air distribution device for a large vacuum boiler according to claim 4, characterized in that: The surface of the filter tank (6) is provided with an inspection port (61).

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