Inverted step type porous medium burner

Abstract

The utility model discloses an inverted-step-shaped porous medium combustor, and belongs to the technical field of energy and combustion. The burner is characterized in that the overall structure of the burner is in an inverted step shape, and four steps correspond to four different areas. Fuel and fresh air enter the premixing cavity 6 at a certain speed through the first air inlet pipeline 4 and the second air inlet pipeline 5 at the same time, premixing is completed in the premixing cavity 6, after premixing is completed, the fuel and the fresh air enter the preheating area 3 to be preheated, and the effect of preventing tempering can be achieved while mixed gas is preheated. After preheating is finished, the gas enters the first combustion area 2, and premixed gas starts to be combusted from the first combustion area 2. In the airflow direction, due to the increase of the circulation area, the airflow speed is reduced, and flames are stabilized in the first combustion area 2 in a self-adaptive mode. When the gas flow speed continues to increase, the flame can be stabilized in the second combustion area 1, and the second combustion area 1 is suitable for occasions with higher gas flow speed. The burner has the advantages that the flame stability limit of the burner is effectively widened, and the safety of the burner is improved.

Description

Technical Field

[0001] This invention belongs to the fields of energy technology and combustion technology, and is a stepped porous media burner with a significantly extended flame stability limit. Background Technology

[0002] In the field of energy utilization and combustion equipment, stable flame combustion has always been a core concern. Traditional burners face the severe challenge of a narrow flame stability limit during actual operation. When combustion conditions such as fluctuations in fuel composition, load changes, or unstable air-fuel mixing ratios occur, the flame is highly susceptible to flameout or flashback. Flameout leads to combustion interruption, preventing the combustion equipment from functioning properly and reducing energy utilization efficiency; flashback can cause serious safety accidents such as explosions, threatening equipment safety and personal health.

[0003] With the continuous expansion of industrial production scale and the increasing demands for efficient and clean energy utilization, improving the flame stability performance of burners has become an urgent priority. Against this backdrop, we have developed an inverted-step porous media burner. This burner, with its unique porous media structure, can effectively extend the flame stability limit. The porous media optimizes the fuel-air mixing process, enhancing mixing uniformity. Simultaneously, utilizing its own thermal inertia and thermal conductivity, it stabilizes the flame root, providing strong support for continuous and stable combustion. This significantly improves the burner's operational stability under complex conditions and is expected to play a vital role in many fields, including industrial combustion and household gas appliances. Summary of the Invention

[0004] The purpose of the present application is to provide an inverted step type porous medium burner, which is innovative in structure compared to the free space burner, and presents an overall structure in the form of an inverted step, each step corresponding to a different function. The technical solution of the present application is that the porous medium burner is composed of 10 ppi foam ceramic (combustion zone two) 1, 20 ppi foam ceramic (combustion zone one) 2, 3 mm alumina small balls (preheating zone) 3, air inlet pipeline one 4, air inlet pipeline two 5, premixing cavity 6, and high-temperature-resistant 316 stainless steel 7. Its characteristics are that, during the working process of the burner, fuel and fresh air enter the premixing cavity 6 through the air inlet pipeline one 4 and the air inlet pipeline two 5 at a certain speed at the same time, and the premixing is completed in the premixing cavity 6. After the premixing is completed, the preheating is carried out in the preheating zone 3, which is filled with 3 mm alumina small balls, and the preheating of the mixed gas can also prevent backfire. After the preheating is completed, the premixed gas starts to burn in the combustion zone one 2. Along the direction of the gas flow, due to the increase of the flow area, the gas flow velocity is reduced, and the flame is adaptively stabilized in the combustion zone one 2, which is filled with foam ceramic with good high-temperature resistance, a porosity of 0.85, and a pore density of 20 ppi, so that the flame burns more stably in this area. Furthermore, through the sudden increase of the flow area, the gas flow forms a backflow in this area, which is beneficial to the stability of the flame.

[0005] When the gas flow velocity continues to increase, the flame will be stabilized in the combustion zone two 1, which is suitable for occasions with larger gas flow velocities, and the area is filled with foam ceramic with good high-temperature resistance, a porosity of 0.85, and a pore density of 10 ppi.

[0006] The effect and benefit of the present application is that the gas flow can be changed in a larger speed range, and the burner outlet can have a wider temperature range to adapt to the needs of various industrial fields. BRIEF DESCRIPTION OF DRAWINGS

[0007] ATTACHMENT Figure 1 is the overall structure diagram of the inverted step type porous medium burner of the present application.

[0008] Figure 1 In the figure: 110 ppi foam ceramic (combustion zone two); 220 ppi foam ceramic (combustion zone one); 33 mm alumina small balls (preheating zone); 4 air inlet pipeline one; 5 air inlet pipeline two; 6 premixing cavity; 7 high-temperature-resistant 316 stainless steel DETAILED DESCRIPTION

[0009] The specific implementation mode of the present application will be described in detail below in combination with the technical solution and the drawings.

[0010] Process 1: According to design requirements, the burner shell is made of high-temperature resistant 316 stainless steel 7 to ensure it can withstand the high temperature and corrosive environment during combustion. Inlet pipe 4 and inlet pipe 5 are installed at corresponding positions in the premixing chamber 6, ensuring a tight connection to prevent gas leakage. Process 2: Inside the burner, 3mm alumina spheres are sequentially filled in the preheating zone 3, 20ppi foam ceramic (porosity 0.85) in combustion zone 2, and 10ppi foam ceramic (porosity 0.85) in combustion zone 1. Process 3: Fuel is introduced into the premixing chamber 6 simultaneously through inlet pipe 4 and fresh air through inlet pipe 5 at a pre-set speed. In the premixing chamber 6, the fuel and air are thoroughly mixed to form a uniform premixed gas. The flow rate of fuel and air can be controlled by adjusting the flow control valve on the inlet pipe to achieve the ideal premixing ratio. Process 4: The premixed gas enters the preheating zone 3 filled with 3mm alumina spheres. In the preheating zone, alumina microspheres absorb the residual heat generated by combustion to preheat the mixed gas. Simultaneously, the structure of the alumina microspheres effectively prevents backfire, ensuring the safety of the combustion process. In process 5, the preheated premixed gas first enters combustion zone 2, where combustion begins. The 20ppi foam ceramic filling combustion zone 2 has good high-temperature resistance and suitable porosity, promoting stable flame combustion. Simultaneously, along the airflow direction, the burner's flow area increases, the airflow velocity decreases, and the flame adaptively stabilizes in this area. Furthermore, the sudden increase in flow area causes airflow recirculation in this area, further improving flame stability. When the airflow velocity continues to increase, the flame stabilizes in combustion zone 2. The 10ppi foam ceramic filling combustion zone 1 also has good high-temperature resistance and porosity, enabling it to adapt to conditions with higher gas flow velocities and ensuring continuous stability of the combustion process. In process 6, during burner operation, parameters such as combustion temperature, gas flow rate, and flame state are monitored in real time. Based on the monitoring results, the flow rate and ratio of fuel and air are adjusted by regulating the flow control valve on the intake pipe. Simultaneously, the condition of each component of the burner is regularly inspected; if wear or blockages are found, timely maintenance and replacement are performed to ensure the burner's normal service life.

Claims

1. A stepped porous medium burner, comprising 10ppi foam ceramic (1), 20ppi foam ceramic (2), 3mm alumina microspheres (3), an air inlet pipe one (4), an air inlet pipe two (5), a premixing chamber (6), and high-temperature resistant 316 stainless steel (7), characterized in that the burner... The overall structure is inverted stepped, with four steps corresponding to four different areas. Fuel and fresh air enter the premixing chamber at a certain speed and mix before entering the preheating zone for preheating. After preheating, the mixture enters the combustion zone one for combustion. When the gas flow rate increases, the mixture will stabilize in the combustion zone two for combustion.

2. The inverted stepped porous media burner according to claim 1, characterized in that the burner... The overall structure is inverted stepped, with the premixing chamber, preheating zone, combustion zone one, and combustion zone two arranged sequentially from upstream to downstream of the burner.

3. The inverted stepped porous medium burner according to claim 1, characterized in that: The preheating zone is filled with 3mm alumina spheres, the combustion zone one is filled with foam ceramic with good high temperature resistance, a porosity of 0.85 and a pore density of 20ppi, and the combustion zone two is filled with foam ceramic with good high temperature resistance, a porosity of 0.85 and a pore density of 10ppi.

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