An oxygen-enriched direct current burner with adjustable combustion performance

Abstract

The present invention relates to the field of oxygen-enriched combustion, and discloses an oxygen-enriched direct current burner with adjustable combustion performance, the oxygen-enriched direct current burner comprises a dense-lean direct current burner, a peripheral wind chamber, a dense-phase oxygen injection tube gun, and a dilute-phase oxygen injection tube gun; the dense-phase oxygen injection tube gun and the dilute-phase oxygen injection tube gun are evenly distributed in the dense-lean side peripheral wind chamber; a dense-phase oxygen injection regulating valve group is arranged on the pipeline of the dense-phase oxygen injection tube gun; a dilute-phase oxygen injection regulating valve group is arranged on the pipeline of the dilute-phase oxygen injection tube gun; the dense-phase oxygen injection regulating valve group and the dilute-phase oxygen injection regulating valve group regulate the oxygen concentration in the dense-lean direct current burner. The present invention solves the problems of poor fire stability and inadequate combustion in the application of pulverized coal burners in the prior art.

Description

Technical Field

[0001] The invention relates to the field of oxygen-enriched combustion, and more specifically to an oxygen-enriched direct current burner with adjustable combustion performance. Background Art

[0002] The deterioration of the global atmospheric environment has attracted widespread attention from the world. The greenhouse effect has become one of the most serious environmental problems facing mankind. It is imperative to develop new clean coal combustion technologies to reduce CO2 emissions in power production. Oxygen-enriched combustion, as a new technology with lower risk for CO2 capture and storage, has gradually attracted attention.

[0003] However, since oxygen-enriched combustion uses an O2 / CO2 atmosphere, it is quite different from conventional boilers in terms of combustion, and is limited by the pulverizing system, the O2 concentration in the primary air of the burner cannot be too high. Therefore, existing conventional pulverized coal burners have problems such as fire stability in application.

[0004] At present, most oxygen-enriched combustion technologies use swirl burners, and rarely use direct current burners. On the one hand, direct current burners are divided into dense phase and light phase, and the application of oxygen-enriched combustion technology to direct current burner engineering transformation is large. On the other hand, the coal quality and load in the project vary greatly, and the existing oxygen-enriched burners have not considered the appropriate structure to solve this problem. Summary of the invention

[0005] In order to solve the problems of poor fire stability and incomplete combustion in the application of pulverized coal burners in the prior art, the present invention provides an oxygen-enriched direct current burner with adjustable combustion performance.

[0006] The specific scheme adopted by the present invention is: an oxygen-rich direct current burner with adjustable combustion performance, the oxygen-rich direct current burner includes a dense and thin direct current burner, a peripheral wind chamber, a dense phase oxygen injection tube gun, and a thin phase oxygen injection tube gun; the dense phase oxygen injection tube gun and the thin phase oxygen injection tube gun are evenly distributed in the dense and thin side peripheral wind chamber; a dense phase oxygen injection regulating valve group is arranged on the pipeline of the dense phase oxygen injection tube gun; a thin phase oxygen injection regulating valve group is arranged on the pipeline of the thin phase oxygen injection tube gun; the dense phase oxygen injection regulating valve group and the thin phase oxygen injection regulating valve group adjust the oxygen concentration in the dense and thin direct current burner.

[0007] A plurality of dense phase oxygen injection tube guns and dilute phase oxygen injection tube guns are arranged in the perimeter wind chamber.

[0008] The pipeline of the dense phase oxygen injection pipe gun and the pipeline of the dilute phase oxygen injection pipe gun are both connected to the oxygen supply main pipe.

[0009] The dense-lean direct current burner is internally divided into a dense phase area and a light phase area, and the volumes of the dense phase area and the light phase area are equal.

[0010] A dense phase oxygen injection tube gun is arranged beside the dense phase zone.

[0011] A light phase oxygen injection tube gun is arranged beside the light phase zone.

[0012] The number of the dense phase oxygen injection tube guns and the number of the dilute phase oxygen injection tube guns are both 3-5.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention arranges a dense phase oxygen injection tube gun and a light phase oxygen injection tube gun in the peripheral wind chamber, and respectively arranges a dense phase oxygen injection regulating valve group and a light phase oxygen injection regulating valve group on the dense phase oxygen injection tube gun and the light phase oxygen injection tube gun. When the pulverized coal airflow in the dense-lean direct current burner is carried and transported by the recycled flue gas, oxygen is sprayed into the furnace through the dense phase oxygen injection tube gun and the light phase oxygen injection tube gun to achieve uniform mixing with the dense phase and light phase pulverized coal airflows, thereby increasing the oxygen concentration of the pulverized coal airflow at the initial stage of combustion and ensuring the ignition stability of the burner. In addition, the dense and light phase oxygen injection tube guns are evenly arranged in the dense and light side peripheral wind chamber, which can also increase the oxygen concentration at the water-cooled wall near the burner, strengthen its oxidizing atmosphere, and effectively alleviate slagging and high-temperature corrosion in this area.

[0015] 2. The dense phase oxygen injection regulating valve group and the light phase oxygen injection regulating valve group in the present invention can respectively adjust the oxygen concentration in the dense phase and the light phase according to the coal quality characteristics and load changes, thereby adjusting the combustion performance of the burner, reducing the amount of engineering modification, and facilitating the transformation of existing boilers into oxygen-enriched combustion boilers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 for Figure 1 AA schematic diagram.

[0018] Wherein, the reference numerals are respectively:

[0019] 1-rich and thin direct current burner, 2-peripheral wind chamber, 3-secondary wind box, 4-rich phase oxygen injection pipe gun, 5-rich phase oxygen injection regulating valve group, 6-oxygen supply main pipe, 7-lean phase oxygen injection pipe gun, 8-lean phase oxygen injection regulating valve group, 9-rich phase area, 10-lean phase area. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, it should be understood here that the described embodiments are not all embodiments and are only used to illustrate the present invention rather than to limit the present invention.

[0021] The present invention provides an oxygen-enriched direct current burner with adjustable combustion performance, the oxygen-enriched direct current burner comprises a dense-lean direct current burner 1, a peripheral wind chamber 2, a dense-phase oxygen injection tube gun 4, and a dilute-phase oxygen injection tube gun 7; the dense-phase oxygen injection tube gun 4 and the dilute-phase oxygen injection tube gun 7 are evenly distributed in the dense-lean side peripheral wind chamber 2; a dense-phase oxygen injection regulating valve group 5 is arranged on the pipeline of the dense-phase oxygen injection tube gun 4; a dilute-phase oxygen injection regulating valve group 8 is arranged on the pipeline of the dilute-phase oxygen injection tube gun 7; the dense-phase oxygen injection regulating valve group 5 and the dilute-phase oxygen injection regulating valve group 8 regulate the oxygen concentration in the dense-lean direct current burner. A plurality of dense-phase oxygen injection tube guns 4 and dilute-phase oxygen injection tube guns 7 are arranged in the peripheral wind chamber 2. Furthermore, the number of the dense-phase oxygen injection tube guns 4 and the dilute-phase oxygen injection tube guns 7 are both 3-5; the pipelines of the dense-phase oxygen injection tube gun 4 and the dilute-phase oxygen injection tube gun 7 are both connected to the oxygen supply main 6. The dense-lean direct current burner 1 is internally divided into a dense phase area 9 and a light phase area 10, and the volumes of the dense phase area 9 and the light phase area 10 are equal. A dense phase oxygen injection tube gun 4 is arranged beside the dense phase area 9, and a light phase oxygen injection tube gun 7 is arranged beside the light phase area 10.

[0022] In the present invention, the coal powder airflow in the dense-lean direct current burner is carried and transported by the recirculated flue gas, and oxygen is sprayed into the furnace through the dense-phase oxygen injection pipe and the light-phase oxygen injection pipe gun to achieve uniform mixing with the dense-phase and light-phase coal powder airflows, thereby increasing the oxygen concentration of the coal powder airflow in the initial stage of combustion, ensuring the ignition stability of the burner, and the dense-phase and light-phase oxygen injection pipe guns are evenly arranged in the dense-lean side peripheral wind chamber, which can also increase the oxygen concentration at the water-cooled wall near the burner, strengthen its oxidizing atmosphere, and effectively alleviate slagging and high-temperature corrosion in this area. In addition, the dense-phase and light-phase oxygen injection regulating valve groups can adjust the oxygen concentration in the dense phase and light phase respectively according to the coal quality characteristics and load changes, thereby adjusting the combustion performance of the burner.

[0023] For anthracite with low volatile content, the concentrated oxygen concentration in the oxygen-enriched DC burner can be increased through the concentrated oxygen injection regulating valve to ensure the ignition performance of the difficult-to-burn coal. When the oxygen-enriched boiler is running at low load, the concentrated oxygen concentration in the oxygen-enriched DC burner can be increased through the concentrated oxygen injection regulating valve to achieve stable combustion at low load.

[0024] In addition, the oxygen concentration in the dense phase and light phase pulverized coal airflows can be adjusted appropriately through the dense phase and light phase oxygen injection regulating valves, which can not only ensure the ignition and stable combustion of the pulverized coal, but also form a suitable reducing atmosphere and reduce nitrogen oxide emissions.

[0025] The present invention provides an oxygen-enriched direct current burner with adjustable combustion performance. Dense phase and light phase oxygen injection tube guns are evenly arranged in the peripheral wind chamber of a traditional pulverized coal dense and thin burner, thereby reducing the amount of engineering modification, facilitating the modification of an existing boiler into an oxygen-enriched combustion boiler, and solving the problems of poor ignition stability and incomplete combustion of pulverized coal burners in application.

[0026] The dense phase and light phase oxygen injection regulating valves in the oxygen-enriched direct current burner provided by the present invention can respectively adjust the oxygen concentration in the dense phase and the light phase, thereby adjusting the combustion performance of the burner, so that the burner can be suitable for different coal qualities such as lignite, bituminous coal and anthracite, and can also be suitable for combustion adjustment under different loads, solving the problem of difficulty in adjusting oxygen content in the prior art.

[0027] The above drawings and explanations are only a specific implementation of the present invention, but the specific protection scope of the present invention is not limited to the above explanations. Any simple replacement or change within the technical idea disclosed in the present invention and the technical solution of the present invention should be within the protection scope of the present invention.

Claims

1. An oxygen-enriched direct current burner with adjustable combustion performance, characterized in that: The oxygen-enriched direct current burner comprises a dense-lean direct current burner (1), a peripheral wind chamber (2), a dense-phase oxygen injection pipe gun (4), and a dilute-phase oxygen injection pipe gun (7); the dense-phase oxygen injection pipe gun (4) and the dilute-phase oxygen injection pipe gun (7) are evenly distributed in the dense-lean side peripheral wind chamber (2); a dense-phase oxygen injection regulating valve group (5) is arranged on the pipeline of the dense-phase oxygen injection pipe gun (4); a dilute-phase oxygen injection regulating valve group (8) is arranged on the pipeline of the dilute-phase oxygen injection pipe gun (7); the dense-phase oxygen injection regulating valve group (5) and the dilute-phase oxygen injection regulating valve group (9) are arranged on the pipeline of the dilute-phase oxygen injection pipe gun (7); The oxygen regulating valve group (8) regulates the oxygen concentration in the dense-lean direct current burner (1); a plurality of dense-phase oxygen injection tube guns (4) and dilute-phase oxygen injection tube guns (7) are arranged in the peripheral wind chamber (2); the interior of the dense-lean direct current burner (1) is divided into a dense phase area (9) and a dilute phase area (10), and the volumes of the dense phase area (9) and the dilute phase area (10) are equal; a dense phase oxygen injection tube gun (4) is arranged beside the dense phase area (9); and a dilute phase oxygen injection tube gun (7) is arranged beside the dilute phase area (10).

2. The oxygen-enriched direct current burner with adjustable combustion performance according to claim 1 is characterized in that: The pipeline of the dense phase oxygen injection pipe gun (4) and the pipeline of the dilute phase oxygen injection pipe gun (7) are both connected to the oxygen supply main pipe (6).

3. The oxygen-enriched direct current burner with adjustable combustion performance according to claim 1, characterized in that: The number of the dense phase oxygen injection tube guns (4) and the number of the dilute phase oxygen injection tube guns (7) are both 3-5.

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