Multi-fuel mixing efficient turbulent burner based on oxygen-enriched and ammonia-doped combustion

Abstract

The utility model discloses a multi-fuel mixing efficient turbulent burner based on oxygen-enriched and ammonia-doped combustion, which comprises a pulverized coal channel, an inner secondary air channel and an outer secondary air channel are arranged at the outlet of the pulverized coal channel, and the pulverized coal channel, the inner secondary air channel and the outer secondary air channel are sequentially and coaxially arranged from inside to outside. A combustion improver channel is coaxially arranged in the pulverized coal channel, a center fuel channel is coaxially arranged in the combustion improver channel, the outlet end of the combustion improver channel and the outlet end of the center fuel channel are aligned and both extend out of the outlet end of the pulverized coal channel, and a pulverized coal concentration ring is fixed in the pulverized coal channel and located on the inner side of the outlet end of the pulverized coal channel. According to the low-carbon waste-free combustion furnace, pulverized coal, natural gas, gasification residues, semi-coke, biomass and ammonia gas can be combusted in a mixed mode, the combustion efficiency is improved, pollutant emission is reduced, and low-carbon waste-free combustion is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of swirl burners, in particular to a multi-fuel mixed high-efficiency swirl burner based on oxygen-enriched and ammonia-blended combustion. Background Art

[0002] The existing pulverized coal swirl burner is mainly used to burn pulverized coal, but with the adjustment of energy structure and the improvement of environmental protection requirements, a burner that can mix and burn multiple fuels is needed to improve combustion efficiency and adapt to the supply of different fuels. Oxygen-enriched combustion technology can significantly increase the combustion temperature, which is conducive to the efficient combustion of gasification residues and blue carbon; ammonia, as a low-carbon fuel, can further optimize the combustion process by supporting combustion. However, it is difficult to realize a swirl burner for efficient mixed combustion of multiple fuels with existing technology. Utility Model Content

[0003] The utility model aims to provide a multi-fuel mixed high-efficiency swirl burner based on oxygen-enriched and ammonia-blended combustion, which can burn coal powder, natural gas, gasification residue, semi-coke, biomass and ammonia, improve combustion efficiency and reduce pollutant emissions, and realize low-carbon and waste-free combustion; the technical solution adopted to achieve the above purpose is:

[0004] A multi-fuel mixed high-efficiency swirl burner based on oxygen-enriched and ammonia-blended combustion, comprising a pulverized coal channel, an inner secondary air channel and an outer secondary air channel being arranged at the outlet of the pulverized coal channel, the pulverized coal channel, the inner secondary air channel and the outer secondary air channel being coaxially arranged in sequence from the inside to the outside, a combustion-aiding agent channel being coaxially arranged in the pulverized coal channel, a central fuel channel being coaxially arranged in the combustion-aiding agent channel, the outlet ends of the combustion-aiding agent channel and the central fuel channel being aligned and both extending out of the outlet end of the pulverized coal channel, a pulverized coal concentration ring being fixed in the pulverized coal channel, the pulverized coal concentration ring being located on the inner side of the outlet end of the pulverized coal channel.

[0005] Preferably, swirlers are provided in both the inner secondary air channel and the outer secondary air channel, the outlet ends of the inner secondary air channel and the outer secondary air channel are aligned, the inner secondary air channel and the outer secondary air channel are annular expanding nozzles, the outlet end of the pulverized coal channel is located inside the annular expanding nozzle, and the outlet ends of the combustion-aid channel and the central fuel channel are located outside the annular expanding nozzle.

[0006] Preferably, a plurality of oxygen-enriched outer channels are uniformly distributed circumferentially around the annular expanded nozzle, and the nozzles of the oxygen-enriched outer channels correspond to the positions of the outlet ends of the combustion-supporting agent channel and the central fuel channel.

[0007] Preferably, one or two fuel feed pipes are provided on the side wall of the pulverized coal channel, the two fuel feed pipes are arranged obliquely from top to bottom, and the nozzles of the two fuel feed pipes correspond to the outlet ends of the combustion-supporting agent channel and the central fuel channel.

[0008] Preferably, an air-coal connecting elbow is provided at the inlet end of the pulverized coal channel, a central air connecting elbow is provided at the inlet end of the combustion-supporting agent channel, and a gas connecting elbow is provided at the inlet end of the central fuel channel. The central air connecting elbow extends out of the pulverized coal channel, and the gas connecting elbow extends out of the central fuel channel and the pulverized coal channel in turn.

[0009] The beneficial effects of the utility model are as follows: (1) natural gas or ammonia and oxygen are directly delivered to the recirculation zone and low-oxygen zone of the combustion center, effectively realizing the high-efficiency and low-nitrogen combined combustion of pulverized coal and ammonia fuel, and improving the environmental friendliness of the coal-fired boiler during use.

[0010] (2) The introduction of oxygen through multiple circumferential oxygen-rich external channels greatly improves the completeness of combustion and the utilization rate of combustion calorific value.

[0011] (3) Gasification residues, lignite or biomass are injected into the two fuel feed pipes under pressure. Due to the effect of natural gas or ammonia in the central fuel channel and oxygen in the central fuel channel, the gasification residues, lignite or biomass and other wastes can be burned and reused, which improves the reuse of wastes and plays an environmental protection role.

[0012] (4) The utility model can burn coal powder, natural gas, gasification residue, lignite, biomass and ammonia to improve combustion efficiency and reduce pollutant emissions, thereby achieving low-carbon and waste-free combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 for Figure 1 One of the center right views;

[0015] Figure 3 for Figure 1 Middle right view 2. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings.

[0017] like Figure 1As shown, the utility model includes a pulverized coal channel 2, at the outlet 13 of the pulverized coal channel 2 an inner secondary air channel 7 and an outer secondary air channel 6 are provided, the pulverized coal channel 2, the inner secondary air channel 7 and the outer secondary air channel 6 are coaxially arranged in sequence from the inside to the outside, an oxidant channel 3 is coaxially provided in the pulverized coal channel 2, a central fuel channel 4 is coaxially provided in the oxidant channel 3, the outlet ends 12 of the oxidant channel 3 and the central fuel channel 4 are aligned, and both extend out of the outlet end 13 of the pulverized coal channel 2, a pulverized coal concentration ring 14 is fixed in the pulverized coal channel 2, the pulverized coal concentration ring 14 is located on the inner side of the outlet end 13 of the pulverized coal channel 2, and the oxidant channel 3 passes through the center of the pulverized coal concentration ring 14.

[0018] A swirler 5 is provided in both the inner secondary air channel 7 and the outer secondary air channel 6, and the outlet ends 11 of the inner secondary air channel 7 and the outer secondary air channel 6 are aligned. The inner secondary air channel 7 and the outer secondary air channel 6 form an annular expanding nozzle, and the outlet end 13 of the pulverized coal channel 2 is located inside the annular expanding nozzle, and the outlet ends 12 of the combustion-supporting agent channel 3 and the central fuel channel 4 are located outside the annular expanding nozzle.

[0019] A plurality of oxygen-enriched outer channels 9 are uniformly distributed around the annular expanded nozzle, and the nozzles of the oxygen-enriched outer channels 9 correspond to the outlet ends 12 of the combustion-supporting agent channel 3 and the central fuel channel 4. One or two fuel feed pipes 8 are arranged on the side wall of the pulverized coal channel 2 in an inclined manner from top to bottom, and the nozzles of the two fuel feed pipes 8 correspond to the outlet ends 12 of the combustion-supporting agent channel 3 and the central fuel channel 4.

[0020] An air-coal connection elbow 1 is provided at the inlet end of the pulverized coal channel 2, a central air connection elbow 16 is provided at the inlet end of the combustion-supporting agent channel 3, and a gas connection elbow 15 is provided at the inlet end of the central fuel channel 4. The central air connection elbow 16 extends out of the pulverized coal 2, and the gas connection elbow 15 extends out of the central fuel channel 3 and the pulverized coal channel 2 in sequence.

[0021] When the utility model is working, the wind coal enters the pulverized coal channel 2 along the direction A1, passes through the pulverized coal concentration ring 14 to increase the concentration of the central pulverized coal and then sprays it into the furnace. While using the pulverized coal as fuel, natural gas or ammonia can be introduced into the central fuel channel 4 along the direction A3, and oxygen can be introduced into the central fuel channel 3 along the direction A2, so that the natural gas or ammonia and oxygen are directly delivered to the recirculation area and low oxygen area of ​​the combustion center, effectively realizing the high-efficiency low-nitrogen combined combustion of pulverized coal and ammonia fuel, and improving the environmental protection of the coal-fired boiler during use; in the secondary Oxygen pipelines can also be introduced into the air channel 7 and the external secondary air channel 6, or an oxygen-enriched external channel 9 can be set up. The introduction of oxygen through multiple circumferential oxygen-enriched external channels 9 greatly improves the completeness of combustion and the utilization rate of combustion calorific value. Gasification residues, lignite or biomass, etc. are sprayed under pressure into the two fuel feed pipes 8. Due to the action of natural gas in the central fuel channel 4 or ammonia in the central fuel channel 3, the combustion and reuse of the above-mentioned gasification residues, lignite or biomass and other wastes can be achieved, which improves the reuse of wastes and plays an environmental protection role.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A multi-fuel mixed high-efficiency swirl burner based on oxygen-enriched and ammonia-blended combustion, comprising a pulverized coal channel, an inner secondary air channel and an outer secondary air channel are arranged at the outlet of the pulverized coal channel, the pulverized coal channel, the inner secondary air channel and the outer secondary air channel are coaxially arranged in sequence from the inside to the outside, characterized in that: An oxidant channel is coaxially arranged in the pulverized coal channel, and a central fuel channel is coaxially arranged in the oxidant channel. The outlet ends of the oxidant channel and the central fuel channel are aligned and both extend out of the outlet end of the pulverized coal channel. A pulverized coal concentrating ring is fixed in the pulverized coal channel and is located on the inner side of the outlet end of the pulverized coal channel.

2. The multi-fuel mixed high-efficiency swirl burner based on oxygen-enriched and ammonia-blended combustion according to claim 1 is characterized in that: Swirls are provided in both the inner secondary air channel and the outer secondary air channel, the outlet ends of the inner secondary air channel and the outer secondary air channel are aligned, the inner secondary air channel and the outer secondary air channel are annular expanding nozzles, the outlet end of the pulverized coal channel is located inside the annular expanding nozzle, and the outlet ends of the combustion-supporting agent channel and the central fuel channel are located outside the annular expanding nozzle.

3. The multi-fuel mixed high-efficiency swirl burner based on oxygen-enriched and ammonia-blended combustion according to claim 2 is characterized in that: A plurality of oxygen-enriched outer channels are uniformly distributed around the annular expanded nozzle in the circumferential direction, and the nozzles of the oxygen-enriched outer channels correspond to the outlet ends of the combustion-supporting agent channel and the central fuel channel.

4. The multi-fuel mixed high-efficiency swirl burner based on oxygen-enriched and ammonia-blended combustion according to any one of claims 1 to 3, characterized in that: One or two fuel feed pipes are provided on the side wall of the pulverized coal channel. The two fuel feed pipes are arranged obliquely from top to bottom, and the nozzles of the two fuel feed pipes correspond to the outlet ends of the combustion-supporting agent channel and the central fuel channel.

5. The multi-fuel mixed high-efficiency swirl burner based on oxygen-enriched and ammonia-blended combustion according to claim 4 is characterized in that: A wind-coal connecting elbow is provided at the inlet end of the pulverized coal channel, a central air connecting elbow is provided at the inlet end of the combustion-supporting agent channel, and a gas connecting elbow is provided at the inlet end of the central fuel channel. The central air connecting elbow extends out of the pulverized coal channel, and the gas connecting elbow extends out of the central fuel channel and the pulverized coal channel in turn.

Images