Biomass boiler low-nitrogen combustion device
The biomass boiler system addresses incomplete combustion and high nitrogen oxide emissions by employing secondary air injection and primary air control, enhancing combustion efficiency and reducing emissions.
Patent Information
- Application Number
- CN202422169087.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-04
AI Technical Summary
Traditional biomass chain boilers lack secondary air devices, resulting in incomplete combustion, high central temperature and high nitrogen oxide emissions.
Using a low-nitrogen combustion device, a spray gun and a secondary fan are provided in the boiler body, and combined with primary air regulation, the excess air volume is controlled, the combustion temperature is reduced, and the low-nitrogen combustion is achieved.
Improve fuel ash rate, reduce nitrogen oxide emissions, improve boiler environmental protection performance, optimize combustion process, reduce energy consumption, simple structure, convenient maintenance, and stable operation.
Smart Images
Figure CN223106078U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of boiler combustion, and specifically to a low-nitrogen combustion device for biomass boilers. Background Art
[0002] Biomass chain boilers are widely used in industrial production fields such as heating. However, traditional biomass chain boilers are only equipped with primary air and do not have secondary air, resulting in incomplete combustion, a relatively high central temperature, and high nitrogen oxide emissions during the combustion process.
[0003] Therefore, how to reduce nitrogen oxide emissions from biomass boilers at the source has become an urgent problem to be solved. Utility Model Content
[0004] Aiming at the deficiencies of the prior art, this application provides a low-nitrogen combustion device for biomass boilers, which has the advantage of fully burning biomass.
[0005] To achieve the above object, this application provides the following technical solution: A low-nitrogen combustion device for biomass boilers includes a boiler body, several groups of spray guns fixedly installed on the furnace of the boiler body, pipelines connected to the outside of the spray guns, secondary air regulating valves installed on the pipelines, an air preheater arranged at one end of the pipeline, and a secondary air blower connected to the air preheater through a pipeline. Several groups of the spray guns are linearly distributed in the furnace of the boiler body, and the air sprayed by several groups of the spray guns passes through the combustion zone of the boiler body to form through-furnace air.
[0006] By applying secondary air and synchronously adjusting the low-nitrogen combustion device of the primary air, the burnout rate of the fuel is improved, and at the same time, the nitrogen oxide emissions of the biomass boiler can be reduced, and the environmental protection performance of the boiler can be improved.
[0007] Preferably, one side of the boiler body is connected to a primary air blower through a pipeline, and a primary air regulating valve is installed on the pipeline connecting the boiler body and the primary air blower.
[0008] The primary air blower passes air through the inside of the boiler body through the pipeline, and at the same time adjusts the primary air regulating valve to reduce the primary air volume, precisely control the excess air volume during the combustion process, and by synchronously reducing the primary air, set the initial excess air coefficient to be less than 1 to reduce the combustion temperature and reduce the generation of nitrogen oxides.
[0009] Preferably, the other side of the boiler body is connected to a economizer through a pipeline, and the economizer is connected to the air preheater through a pipeline.
[0010] The flue gas generated by the boiler body passes through the economizer and the air preheater to preheat the air, reducing energy consumption.
[0011] Preferably, the nozzle of the spray gun is a flat nozzle.
[0012] The spray gun supplies secondary air to the boiler body and sprays it into the furnace through the nozzle of the spray gun. The air is fully mixed with the unburned fuel and burned, thus achieving low-nitrogen combustion.
[0013] In summary, the present application includes at least one of the following beneficial effects:
[0014] 1. The low-nitrogen combustion device of this biomass boiler, by applying secondary air and synchronously adjusting the low-nitrogen combustion device of primary air, improves the burnout rate of the fuel, reduces the nitrogen oxide emissions of the biomass boiler, and improves the environmental protection performance of the boiler.
[0015] 2. The low-nitrogen combustion device of this biomass boiler optimizes the combustion process, improves the combustion efficiency of the fuel, reduces energy consumption, and has a simple device structure, reasonable design, convenient maintenance, stable and reliable operation, is applicable to various biomass fuels, and reduces the operation cost. Description of the Drawings
[0016] Figure 1 It is the overall structure diagram of the boiler of the present application.
[0017] Among them: 1. Boiler body; 2. Primary air fan; 3. Primary air regulating valve; 4. Economizer; 5. Secondary air fan; 6. Air preheater; 7. Pipeline; 8. Secondary air regulating valve; 9. Spray gun. Specific Embodiments
[0018] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.
[0019] Please refer to Figure 1, A low-nitrogen combustion device for a biomass boiler, comprising a boiler body 1, several groups of spray guns 9 fixedly installed on the furnace of the boiler body 1, a pipeline 7 connected to the outside of the spray guns 9, a secondary air regulating valve 8 installed on the pipeline 7, an air preheater 6 arranged at one end of the pipeline 7, and a secondary air blower 5 connected to the air preheater 6 through a pipeline. The several groups of spray guns 9 are linearly distributed in the furnace of the boiler body 1. The air sprayed by the several groups of spray guns 9 passes through the combustion zone of the boiler body 1 to form through-furnace air. The nozzle of the spray gun 9 is a flat nozzle. The spray gun 9 supplies secondary air to the boiler body 1 and is sprayed into the furnace through the nozzle of the spray gun 9. The air is fully mixed and burned with the unburned fuel, thus achieving low-nitrogen combustion. One side of the boiler body 1 is connected to a primary air blower 2 through a pipeline, and a primary air regulating valve 3 is installed on the pipeline connecting the boiler body 1 and the primary air blower 2. The other side of the boiler body 1 is connected to a economizer 4 through a pipeline, and the economizer 4 is connected to the air preheater 6 through a pipeline. The flue gas generated by the boiler body 1 passes through the economizer 4 and the air preheater 6 to preheat the air, reducing energy consumption.
[0020] Working principle: When biomass burns inside the boiler body 1, the secondary air blower 5 sends air to the air preheater 6 for preheating. The air preheater 6 is connected to the spray gun 9 through the pipeline 7. A secondary air regulating valve 8 is provided on the pipeline 7 to regulate the secondary air. The spray gun 9 sprays the air into the boiler body 1. The spray guns 9 are arranged in a row, and the wind speed is controlled within 10 - 25 m / s to form through-furnace air above the fire. The air excess coefficient is greater than 1 to strengthen combustion. At this time, the temperature of the entire furnace is relatively uniform, and there will be no over-temperature area, reducing the generation of nitrogen oxides. The primary air blower 2 sends air through the pipeline inside the boiler body 1, and at the same time adjusts the primary air regulating valve 3 to reduce the primary air volume and precisely control the excess air volume during the combustion process. By synchronously reducing the primary air and setting the initial air excess coefficient to be less than 1, the combustion temperature is reduced, and the generation of nitrogen oxides is reduced. Through this process, secondary air is supplied to the boiler, and the spray gun 9 sprays the air into the boiler body 1. The air excess coefficient is greater than 1, and the air is fully mixed and burned with the unburned fuel, thus achieving low-nitrogen combustion.
[0021] Although the embodiments of the present application have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.
Claims
1. A low-nitrogen combustion device for a biomass boiler, comprising a boiler body (1), a plurality of groups of spray guns (9) fixedly installed on the furnace of the boiler body (1), a pipeline (7) connected to the outside of the spray guns (9), a secondary air regulating valve (8) installed on the pipeline (7), an air preheater (6) arranged at one end of the pipeline (7), and a secondary air blower (5) communicated with the air preheater (6) through a pipeline, characterized in that: Several groups of the spray guns (9) are linearly distributed in the furnace of the boiler body (1), and the air ejected by several groups of the spray guns (9) passes through the combustion zone of the boiler body (1) to form through-furnace air.
2. The low-nitrogen combustion device for a biomass boiler according to claim 1, wherein: One side of the boiler body (1) is connected to a primary air fan (2) through a pipeline, and a primary air regulating valve (3) is installed on the pipeline connecting the boiler body (1) and the primary air fan (2).
3. A low-nitrogen combustion device for a biomass boiler according to claim 1, characterized in that: The other side of the boiler body (1) is connected to an economizer (4) through a pipeline, and the economizer (4) is connected to an air preheater (6) through a pipeline.
4. A low-nitrogen combustion device for a biomass boiler according to claim 1, characterized in that: The nozzle of the spray gun (9) is a flat nozzle.