阅读说明：本技术 一种同时燃用nh3和煤粉的直流燃烧器 (NH for simultaneous combustion3Pulverized coal direct-current burner ) 是由 方顺利 李宇航 郭洋洲 张向宇 刘家利 姚伟 李炎 杜智华 于 2021-10-26 设计创作，主要内容包括：本发明公开了一种同时燃用NH-(3)和煤粉的直流燃烧器,包括包括环形的一次风通道(1),设置在一次风通道(1)中心的NH-(3)燃烧通道(3),以及设置在一次风通道(1)外的周界风通道(2)。直流燃烧器工作时,NH-(3)与空气在多孔介质燃烧通道中燃烧,释放热量并加热内二次风和外二次风。过量的NH-(3)可在燃烧区与烟气中的NO反应,从而脱除部分NOx。本发明可减少煤炭的使用量,并可降低煤炭燃烧过程中的NOx的生成。(The invention discloses a method for simultaneously combusting NH 3 The direct-current combustor comprises an annular primary air channel (1) and NH arranged at the center of the primary air channel (1) 3 A combustion channel (3), and a peripheral wind channel (2) arranged outside the primary wind channel (1). When the once-through burner is in operation, NH 3 And the air is combusted in the porous medium combustion channel to release heat and heat the inner secondary air and the outer secondary air. Excess NH 3 Can react with NO in the flue gas in the combustion zone, thereby removing part of NOx. The invention can reduce the usage amount of coal and reduce the coal combustionFormation of NOx in the process.)

1. NH for simultaneous combustion₃The direct-current combustor for pulverized coal is characterized by comprising an annular primary air channel (1) and NH arranged at the center of the primary air channel (1)₃A combustion channel (3), and a peripheral wind channel (2) arranged outside the primary wind channel (1).

2. The simultaneous combustion NH as set forth in claim 1₃And the direct-current combustor of the pulverized coal, characterized by that, the primary air enters the primary air channel (1) through the primary air entrance (8) with pulverized coal, and control the flow of the primary air and pulverized coal through the primary air valve (7).

3. The simultaneous combustion NH as set forth in claim 1₃And pulverized coal, characterized in that the peripheral air enters the peripheral air channel (2) through a peripheral air inlet (9), and the flow of the inner secondary air is controlled through a peripheral air valve (10).

4. The simultaneous combustion NH as set forth in claim 1₃And pulverized coal, characterized by gaseous NH₃By NH₃NH is introduced at the inlet (11)₃Combustion channel (3) and passing NH₃NH control by valve (5)₃The flow rate of (c).

5. A method according to claim 1NH for time combustion₃And pulverized coal, characterized in that combustion air enters NH through an air inlet (12)₃A combustion channel (3) and controls the flow of combustion air through a combustion air valve (6).

6. The simultaneous combustion NH as set forth in claim 1₃And pulverized coal, characterized by NH₃The combustion channel (3) comprises a premixing chamber (4) at the front end and a porous medium combustion zone (13) at the rear end.

7. The simultaneous combustion NH as set forth in claim 6₃And pulverized coal, characterized in that the porous medium combustion zone (13) adopts a metal porous medium with good heat transfer characteristics.

8. The simultaneous combustion NH as set forth in claim 6₃And pulverized coal, characterized by NH₃And combustion air is passed over the NH₃The flow rate of the valve (5) and the combustion air control valve (6) is controlled, the valve enters the premixing chamber (4) for full premixing, premixed combustion is carried out in the porous medium combustion area (13), heat is released in the combustion process, primary air in the primary air channel (1) is added by heat, and when the primary air carrying pulverized coal flows in the primary air channel (1), NH positioned in the center of the channel₃The combustion channel (3) is used as a bluff body.

9. The simultaneous combustion NH as set forth in claim 6₃And pulverized coal, characterized by NH₃NH is controlled by a valve (5) and a combustion air control valve (6)₃The ratio of the air to the combustion air is 1: 2.975-1: 3.571.

Technical Field

The invention belongs to the technical field of combustion, and particularly relates to NH for simultaneous combustion₃And a pulverized coal direct-flow combustor.

Background

In recent years, the world energy consumption has been increasing, and the consumption of fossil fuels has been accompanied by a series of environmental problems while bringing social and economic benefits. The introduction of "carbon peak" and "carbon neutralization" requires the search for alternative fuels to reduce CO₂And (4) discharging. NH (NH)₃Clean energy carriers and storage media are considered to be promising. NH (NH)₃Can be obtained from biomass or other renewable resources, has lower cost of unit stored energy, higher volume energy density and good safety and reliability, thereby utilizing NH₃Replace partial combustion of coal and reduce CO₂And (4) discharging. At the same time, NH₃Can be synthesized from electric energy by using NH₃Burning, can store new energy electric quantity and realize NH₃The material is used as an energy storage material with low price and easy acquisition.

Disclosure of Invention

The invention aims to provide a method for simultaneously combusting NH₃With pulverized coal, simultaneously burning NH₃And pulverized coal, NH₃Heat is released in the burning process to heat the air and excessive NH needed by the combustion of the pulverized coal₃After entering a combustion zone of a boiler hearth, NOx in the flue gas can be reduced, so that the generation of NOx in the combustion process of the boiler is reduced. By NH₃The consumption of the coal required by the boiler with load is reduced.

The invention has the advantages of simultaneously burning NH₃And pulverized coal, can utilize NH₃The combustion of (2) replaces part of the coal dust, thereby reducing the consumption of the coal and reducing the generation of NOx in the combustion process.

The invention is realized by adopting the following technical scheme:

NH for simultaneous combustion₃The direct-current combustor comprises an annular primary air channel and NH arranged at the center of the primary air channel₃A combustion channel, and a peripheral wind channel disposed outside the primary wind channel.

The invention is further improved in that primary air carrying pulverized coal enters the primary air channel through the primary air inlet, and the primary air and the flow of the pulverized coal are controlled by the primary air valve.

The invention is further improved in that the peripheral wind enters the peripheral wind channel through the peripheral wind inlet and controls the flow of the inner secondary wind through the peripheral wind valve.

A further development of the invention is that gaseous NH₃By NH₃Inlet into NH₃Combustion channel and passing NH₃Valve controlled NH₃The flow rate of (c).

A further development of the invention is that combustion air enters the NH via an air inlet₃And the combustion channel controls the flow of combustion air through a combustion air valve.

In a further development of the invention, NH₃The combustion passage includes a premix chamber at a forward end and a porous media combustion zone at an aft end.

The invention is further improved in that the porous medium combustion zone adopts a metal porous medium with good heat transfer characteristics.

In a further development of the invention, NH₃And combustion air is passed over the NH₃The valve and the combustion-supporting air control valve control the flow, after the flow enters the premixing chamber to be fully premixed, the flow is premixed and combusted in the porous medium combustion area, heat is released in the combustion process, primary air in the primary air channel is added by heat, and when the primary air carrying pulverized coal flows in the primary air channel, NH positioned in the center of the channel₃The combustion channel is adapted to act as a bluff body.

In a further development of the invention, NH₃Valve and combustion air control valve control NH₃The ratio of the air to the combustion air is 1: 2.975-1: 3.571.

Compared with the prior art, the invention has at least the following beneficial technical effects:

(1) the burner of the invention can burn partial NH₃And release heat to replace coal due to NH₃No CO generation after combustion₂Thus, the use of the burner of the present invention may help to reduce CO₂And (4) discharging.

(2) Gaseous NH₃Circular NH distributed in the middle of primary air channel₃The burner emits heat in the combustion process in the combustion channel, transfers the heat to primary air in the primary air channel through heat conduction, improves the temperature of the primary air, can improve the ignition stability of the pulverized coal, and promotes the ignition and burnout of the pulverized coal, so the burner is particularly suitable for difficult-to-combust coal with low volatile components and high ignition point.

(3) Burner of the invention, NH₃With combustion of air, NH₃In a slight excess state, unburned NH₃After entering the pulverized coal combustion area, the pulverized coal reacts with NO in the flue gas to generate N₂And H₂And O, thereby removing part of NOx in the flue gas and achieving the purpose of reducing the emission of NOx.

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 numerals:

1-primary air channel; 2-perimeter wind channel; 3-NH₃A combustion channel; 4-NH₃A premixing chamber; 5-NH₃A valve; 6-combustion air valve; 7-primary air valve; 8-primary air inlet; 9-perimeter wind inlet; 10-perimeter air valve; 11-NH₃An inlet; 12-combustion air inlet; 13-porous media.

Detailed Description

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 to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in figures 1 and 2, the invention provides a simultaneous combustion NH₃The direct-current combustor for pulverized coal comprises an annular primary air channel 1 and NH arranged at the center of the primary air channel 1₃A combustion channel 3, and a peripheral wind channel 2 disposed outside the primary wind channel 1.

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

Preferably, the peripheral wind enters the peripheral wind channel 2 through the peripheral wind inlet 9, and the flow of the inner secondary wind is controlled through the peripheral wind valve 10.

Preferably, gaseous NH₃By NH₃Inlet 11 enters NH₃Combustion channel 3 and passing NH₃Valve 5 control of NH₃The flow rate of (c).

Preferably, combustion air enters the NH via air inlet 12₃The combustion channel 3 controls the flow of the combustion air through a combustion air valve 6.

Preferably, NH₃The combustion channel 3 comprises a premixing chamber 4 at the front end and a porous medium combustion zone 13 at the rear end.

Preferably, the porous medium combustion zone 13 is made of a metal porous medium with good heat transfer characteristics.

Preferably, NH₃And combustion air is passed over the NH₃The valve 5 and the combustion air control valve 6 control the flow, after entering the premixing chamber 4 for full premixing, the premixing combustion is carried out in the porous medium combustion area 13, the heat is released in the combustion process, the primary air in the primary air channel 1 is added by the heat, and when the primary air carrying the pulverized coal flows in the primary air channel 1, the primary air positioned in the center of the channelNH₃The combustion channel 3 serves as a bluff body.

Preferably, NH₃NH control by valve 5 and combustion air control valve 6₃The ratio of the air to the combustion air is 1: 2.975-1: 3.571.

Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.