CN216480941U - A once-through burner that simultaneously burns NH3 and pulverized coal - Google Patents

Abstract

The utility model discloses a straight-through burner that simultaneously burns _NH3 and pulverized coal, comprising an annular primary air channel (1), an _NH3 combustion channel (3) arranged in the center of the primary air channel (1), and A peripheral air channel (2) is arranged outside the primary air channel (1). When the once-through burner works, _NH3 and air are burned in the porous medium combustion channel, releasing heat and heating the inner and outer secondary air. Excess _NH3 can react with NO in the flue gas in the combustion zone, thereby removing part of the NOx. The utility model can reduce the consumption of coal, and can reduce the generation of NOx in the process of coal combustion.

Description

A once-through burner that simultaneously burns NH3 and pulverized coal

technical field

The utility model belongs to the technical field of combustion, in particular to a straight-through burner that simultaneously burns NH ₃ and pulverized coal.

Background technique

In recent years, the world's energy consumption has been increasing continuously. While the consumption of fossil fuels brings social and economic benefits, it will be accompanied by a series of environmental problems. The proposition of "carbon peaking" and "carbon neutrality" calls for finding other alternative fuels to reduce CO ₂ emissions. _NH3 is regarded as a promising clean energy carrier and storage medium. _NH3 can be obtained from biomass or other renewable resources, with low cost per unit of stored energy, high volumetric energy density, and good safety and reliability. Therefore, using _NH3 to replace part of coal combustion can reduce _CO2 emissions. At the same time, NH ₃ can be synthesized by electrical energy, and NH ₃ can be used for combustion, which can store new energy power, and can realize the use of NH ₃ as a cheap and easy-to-obtain energy storage material.

Utility model content

The purpose of this utility model is to provide a direct-flow burner that burns NH ₃ and pulverized coal at the same time, which can burn NH ₃ and pulverized coal at the same time. During the burning process of NH ₃ , heat is released, and the air required for the combustion of pulverized coal is heated. , after the excess NH ₃ enters the combustion zone of the boiler furnace, it can reduce the NOx in the flue gas, thereby reducing the NOx generation in the boiler combustion process. Through the combustion of _NH3 , the coal consumption required for the boiler to be loaded is reduced.

The utility model has the advantages that _NH3 and coal powder can be simultaneously burned, and the combustion of _NH3 can be used to replace part of the coal powder, thereby reducing the consumption of coal combustion and the generation of NOx in the combustion process.

The utility model adopts the following technical solutions to realize:

A once-through burner for burning _NH3 and pulverized coal at the same time comprises an annular primary air channel, an _NH3 combustion channel arranged in the center of the primary air channel, and a peripheral air channel arranged outside the primary air channel.

The further improvement of the utility model is that the primary air carries the pulverized coal into the primary air channel through the primary air inlet, and controls the flow of the primary air and the pulverized coal through the primary air valve.

A further improvement of the utility model is that the peripheral air enters the peripheral air passage through the peripheral air inlet, and the flow of the inner secondary air is controlled through the peripheral air valve.

The further improvement of the utility model is that gaseous NH ₃ enters the NH ₃ combustion channel through the NH ₃ inlet, and the flow rate of NH ₃ is controlled through the NH ₃ valve.

The further improvement of the utility model is that the combustion-supporting air enters the _NH3 combustion passage through the air inlet, and the flow rate of the combustion-supporting air is controlled through the combustion-supporting air valve.

A further improvement of the present invention is that the NH ₃ combustion channel includes a premixing chamber at the front end and a porous medium combustion zone at the rear end.

A further improvement of the utility model lies in that the porous medium combustion zone adopts metal porous medium with good heat transfer characteristics.

The further improvement of the utility model is that the flow of _NH3 and combustion-supporting air is controlled by the _NH3 valve and the combustion-supporting air valve, and after entering the premixing chamber for full premixing, premix combustion is carried out in the porous medium combustion zone, and the combustion process releases heat, And use the heat to add the primary air in the primary air channel. When the primary air carrying pulverized coal flows in the primary air channel, the NH ₃ combustion channel in the center of the channel is used as a bluff body.

A further improvement of the utility model is that the ratio of NH ₃ to combustion air is controlled by the NH ₃ valve and the combustion-supporting air valve to be 1:2.975-1:3.571.

Compared with the prior art, the present utility model at least has the following beneficial technical effects:

(1) The burner of the present utility model can burn part of NH ₃ and release heat to replace coal. Since NH ₃ will not generate CO ₂ after burning, the use of the burner of the present utility model can help reduce the _CO2 emissions.

(2) Gaseous NH ₃ releases heat during the combustion process in the circular NH ₃ combustion channel distributed in the middle of the primary air channel, and transfers the heat to the primary air in the primary air channel through heat conduction, increasing the temperature of the inner primary air, which can The ignition stability of the pulverized coal is improved, and the ignition and burnout of the pulverized coal are promoted. Therefore, the burner of the utility model is particularly suitable for the flame-retardant coal with low volatile content and high ignition point.

(3) In the burner of the present utility model, during the combustion process of NH ₃ and air, NH ₃ is in a state of slight excess, and after the unburned NH ₃ enters the pulverized coal combustion area, it will react with NO in the flue gas to generate N ₂ and H ₂ O, so as to remove part of NOx in the flue gas and achieve the purpose of reducing NOx emission.

Description of drawings

FIG. 1 is a front view of the once-through burner of the present invention.

FIG. 2 is a top view of the once-through burner of the present invention.

Description of reference numbers:

1—primary air passage; 2—perimeter air passage; 3— _NH3 combustion passage; 4— _NH3 premixing chamber; 5— _NH3 valve; 6—combustion air valve; 7—primary air valve ; 8 - primary air inlet; 9 - perimeter air inlet; 10 - perimeter air valve; 11 - NH ₃ inlet; 12 - combustion air inlet; 13 - porous medium.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be more thoroughly understood, and will fully convey the scope of the present disclosure to those skilled in the art. It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict. The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in Figure 1 and Figure 2, the utility model provides a direct-flow burner that simultaneously burns NH ₃ and pulverized coal, including an annular primary air channel 1, and an NH ₃ combustion channel 3 arranged in the center of the primary air channel 1 , and the perimeter air channel 2 set outside the primary air channel 1 .

Preferably, the primary air carries pulverized coal into the primary air channel 1 through the primary air inlet 8 , and controls the flow of the primary air and the pulverized coal through the primary air valve 7 .

Preferably, the peripheral air enters the peripheral air passage 2 through the peripheral air inlet 9 , and controls the flow of the inner secondary air through the peripheral air valve 10 .

Preferably, the gaseous NH ₃ enters the NH ₃ combustion channel 3 through the NH ₃ inlet 11 , and the flow rate of the NH ₃ is controlled through the NH ₃ valve 5 .

Preferably, the combustion air enters the NH ₃ combustion passage 3 through the air inlet 12 , and the flow of the combustion air is controlled through the combustion air valve 6 .

Preferably, the NH ₃ combustion channel 3 includes a premixing chamber 4 at the front end and a porous medium combustion zone 13 at the rear end.

Preferably, the porous media combustion zone 13 adopts metal porous media with good heat transfer properties.

Preferably, the flow of _NH3 and combustion-supporting air is controlled through the _NH3 valve 5 and the combustion-supporting air valve 6, and after entering the premixing chamber 4 for sufficient premixing, premixed combustion is carried out in the porous media combustion zone 13, and the combustion process releases heat, and Using heat to add the primary air in the primary air channel 1, when the primary air carrying pulverized coal flows in the primary air channel 1, the NH ₃ combustion channel 3 in the center of the channel is used to act as a bluff body.

Preferably, the NH ₃ valve 5 and the combustion air valve 6 control the ratio of NH ₃ to combustion air to be 1:2.975-1:3.571.

Although the present utility model has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the present utility model, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not departing from the spirit of the present invention belong to the protection scope of the present invention.

Claims (9)

1. A straight-through burner for simultaneously burning NH ₃ and pulverized coal, characterized in that it comprises an annular primary air channel (1), an NH ₃ combustion channel (3) arranged in the center of the primary air channel (1), and A peripheral air channel (2) is arranged outside the primary air channel (1). 2. A straight-through burner for simultaneously burning NH ₃ and pulverized coal according to claim 1, wherein the primary air carries pulverized coal into the primary air passage (1) through the primary air inlet (8), and passes through the primary air inlet (8). The primary air valve (7) controls the flow of primary air and pulverized coal. _3. a kind of straight-through burner burning NH and pulverized coal at the same time according to claim 1, is characterized in that, perimeter wind enters perimeter air passage (2) through perimeter air inlet (9), and is controlled by perimeter air valve (10) Internal secondary air flow. 4. A once-through burner for simultaneously burning NH ₃ and pulverized coal according to claim 1, wherein gaseous NH ₃ enters the NH ₃ combustion channel (3) through the NH ₃ inlet (11), and passes through the NH 3 inlet (11). ₃ Valve (5) controls the flow of _NH3 . 5. A straight-through burner using NH ₃ and pulverized coal at the same time according to claim 1, wherein the combustion-supporting air enters the NH ₃ combustion passage (3) through the air inlet (12), and passes through the combustion-supporting air valve (6) Control the flow of combustion air. 6. A once-through burner for simultaneously burning _NH3 and pulverized coal according to claim 1, wherein the _NH3 combustion channel (3) comprises a premixing chamber (4) at the front end and a porous medium at the back end combustion zone (13). 7 . The once-through burner that simultaneously burns NH ₃ and pulverized coal according to claim 6 , wherein the porous media combustion zone ( 13 ) adopts metal porous media with good heat transfer characteristics. 8 . 8. a kind of straight-through burner burning _NH3 and pulverized coal at the same time according to claim 6, is characterized in that, _NH3 and combustion-supporting air control flow through _NH3 valve (5) and combustion-supporting air valve (6), After entering the premixing chamber (4) for full premixing, premixing combustion is carried out in the porous medium combustion zone (13), the combustion process releases heat, and the heat is used to add primary air in the primary air passage (1) to carry pulverized coal. When the primary air flows in the primary air channel (1), the NH ₃ combustion channel (3) in the center of the channel is used to act as a bluff body. 9. a kind of straight-through burner burning _NH3 and pulverized coal at the same time according to claim 6, is characterized in that, _NH3 valve (5) and combustion-supporting air valve (6) control _NH3 and the ratio of combustion-supporting air is 1:2.975～1:3.571.

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