CN201827891U - Anti-backfire premixing porous medium burner nozzle - Google Patents

Abstract

The utility model relates to a gas burning device, in particular to a premixing porous medium burner nozzle. An anti-backfire premixing porous medium burner nozzle comprises a burner shell, wherein one end of the burner shell is connected with a mixed fuel gas pipeline; a premixing chamber is formed in the internal cavity of the burner shell; a small-hole foamed ceramic porous medium, a ceramic particle bonding plate and a large-hole foamed ceramic porous medium are arranged in the internal cavity of the burner shell; the small-hole foamed ceramic porous medium is closes to the premixing chamber; the large-hole foamed ceramic medium is far away from the premixing chamber; and the ceramic particle bonding plate is arranged between the small-hole foamed ceramic porous medium and the large-hole foamed ceramic porous medium. The ceramic particle bonding plate is arranged between the large-hole foamed ceramic porous medium and the small-hole foamed ceramic porous medium, so that the thermal conductivity coefficient of a small-hole ceramic foamed porous medium material is lowered and anti-backfire safety performance is enhanced remarkably.

Description

Flashback-proof premixed porous media burners

technical field

The utility model relates to a gas combustion device, in particular to a premixed porous medium burner.

Background technique

Process furnaces have high requirements on temperature uniformity. In the past, most of the gas combustion devices used in industrial furnaces used open flame heating. Because the shape of the flame is difficult to control, if the flame directly scours the material, the quality of the material will often be damaged. So now a kind of burner is specially designed. By rationally designing the structure of the burner, optimizing the composition and structure of the porous media material in the burner, the combustion device can form a stable flameless combustion.

In the prior art, CN101128469A discloses a segmented porous ceramic medium gas fuel burner. As shown in FIG. 3. Perforated plate 4, dust removal layer 5, air pipe 6, premixing chamber 7, gas pipe 8, flange 9, nut 10, bolt 11 and screw hole 3, inside the upper cavity of the burner shell 1 is composed of The macroporous ceramic foam porous medium 2 , the microporous ceramic foam porous medium 3 and the porous plate 4 are arranged in sequence from top to bottom, and the dust removal layer 5 is arranged under the porous plate 4 . The perforated plate 4 is sandwiched between the upper and lower parts of the burner housing 1, and the perforated plate 4 and the burner housing 1 are connected together by flanges 9, nuts 10 and bolts 11; the lower cavity of the burner housing 1 is The premix chamber 7 is provided with an air pipeline 6 and a gas pipeline 8 on the side wall. The segmented porous ceramic medium gas fuel burner prevents flashback by increasing the heat dissipation effect of the porous plate 4 , but due to the limited heat dissipation effect of the porous plate 4 , it cannot fundamentally solve the tempering problem.

Contents of the invention

The technical problem to be solved by the utility model is to provide an anti-tempering premixed porous medium burner, which is provided with a ceramic particle bonding plate between the large and small pore foam ceramic porous media, and reduces the small pore foam The thermal conductivity of ceramic porous media materials significantly improves the safety performance of anti-tempering.

The utility model is realized in the following way: a premixed porous media burner for anti-tempering, including a burner shell, one end of the burner shell is connected with the mixed gas pipeline, and the inner cavity of the burner shell is connected with the mixed gas pipeline The connected end is a premixing chamber, and the internal cavity of the burner shell is also provided with a small-pore foamed ceramic porous medium, a ceramic particle bonding plate and a large-pored foamed ceramic porous medium, and the small-pored ceramic foamed porous medium The medium is close to the premixing chamber, and the macroporous ceramic foam porous medium is far away from the premixing chamber, and the ceramic particle bonding plate is arranged between the small pore foam ceramic porous medium and the macroporous ceramic foam porous medium to connect the two together .

The thermal conductivity of the small-pore foam ceramic porous medium is smaller than that of the large-pore foam ceramic porous medium.

The average pore diameter of the small-pore foam ceramic porous medium is 10-20PPI, and the porosity is 75-85%; the average pore diameter of the smaller than large-pore foam ceramic porous medium is 50-60PPI, and the porosity is 80-85%.

The average pore diameter of the ceramic particle bonding plate is 2-5PPI, and the porosity is 20-40%.

The small-pore foam ceramic porous medium is in the shape of a truncated cone.

The mixed gas pipeline has a built-in swirl plate.

The thermal conductivity of the small-pore foam ceramic porous medium in the anti-tempering premixed porous medium burner of the utility model is smaller than that of the large-pore foam ceramic porous medium to ensure the temperature of the surface of the small-pore foam ceramic porous medium close to the premixing chamber It is lower than the ignition point of the mixed gas, avoiding the combustion of the mixed gas in the premixed chamber, and avoiding the burner backfire phenomenon; and a ceramic particle bonding plate is added between the large-pore foam ceramic porous medium and the small-pore foam ceramic porous medium, and The foamed ceramic porous medium near the premixing chamber adopts the small-pore foamed ceramic porous medium to prevent the flame from propagating back. the

Description of drawings

Fig. 1 is the structural schematic diagram of existing segmented porous ceramic medium gas fuel burner;

Fig. 2 is a structural schematic diagram of the anti-tempering premixed porous media burner of the present invention.

In the figure: 1 burner shell, 2 large porous ceramic foam porous medium, 3 small porous ceramic foam porous medium, 4 porous plate, 5 dust removal layer, 6 air pipe, 7 premixing chamber, 8 gas pipe, 9 flange, 10 Nuts, 11 bolts, 12 mixed gas pipes, 13 ceramic particle bonded plates, 14 refractory castables, 15 high temperature resistant gaskets.

Detailed ways

Below in conjunction with specific embodiment, further set forth the utility model. It should be understood that these embodiments are only used to illustrate the present utility model and are not intended to limit the scope of the present utility model. In addition, it should be understood that after reading the content of the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the appended claims of the application.

Example 1

As shown in Figure 2, a premixed porous media burner for preventing backfire includes a burner casing 1, one end of the burner casing 1 is connected to a mixed gas pipeline 12, and the mixed gas pipeline 12 has a built-in swirl plate , used to strengthen the mixing effect of combustible gas and combustion-supporting gas in the pipeline; one end of the inner cavity of the burner housing 1 that communicates with the mixed gas pipeline 12 is a premixing chamber 7, and the inner cavity of the burner housing 1 Small-pore ceramic foam porous medium 3, ceramic particle bonding plate 13 and large-pore ceramic foam porous medium 2 are also arranged in sequence, and the porous ceramic foam medium 3 with small pores is close to the premixing chamber 7, and the porous ceramic foam with large pores The medium 2 is far away from the premixing chamber 7, and the ceramic particle bonding plate 13 is arranged between the small-pore ceramic foam porous medium 3 and the large-pore ceramic foam porous medium 2 to connect the two together; in the present embodiment, the The average pore diameter of the small-pore ceramic foam porous medium 3 is 10-20PPI, and the porosity is 75-85%; the average pore diameter of the smaller-cell foam ceramic porous medium 2 is 50-60PPI, and the porosity is 80-85%; The average pore diameter of the ceramic particle bonding plate 13 is 2-5PPI, and the porosity is 20-40%.

In this embodiment, the thermal conductivity of the small-pore ceramic foam porous medium 3 is lower than that of the large-pore ceramic foam porous medium 2 to ensure that the temperature of the surface of the small-pore ceramic foam porous medium 3 near the premixing chamber 7 is lower than The ignition point of the mixed gas can avoid the combustion of the mixed gas in the premix chamber 7, which can improve the anti-backfire safety performance of the burner and avoid the backfire phenomenon of the burner.

During installation, at first pre-embed bolts in the refractory castable 14, the burner housing 1 is fixed in the refractory castable 14 by bolts, and the burner housing 1 and the refractory castable 14 are sealed with a high temperature resistant gasket 15. In the burner shell 1, the large-pore foam ceramic porous medium 2, the ceramic particle bonding plate 13, and the small-pore foam ceramic porous medium 3 are sequentially loaded, and the burner shell 1 is fixedly connected with the mixed gas pipeline 12; Stable flameless combustion in macroporous ceramic foam porous media 2.

Claims (5)

1. A premixed porous media burner for preventing tempering, comprising a burner shell (1), one end of the burner shell (1) is connected to the mixed gas pipeline (12), and the inside of the burner shell (1) is empty One end of the chamber connected to the mixed gas pipeline (12) is a premix chamber (7), which is characterized in that: the internal cavity of the burner casing (1) is also sequentially provided with small-pore foam ceramic porous media (3 ), ceramic particle bonding plate (13) and macroporous ceramic foam porous medium (2), described microporous ceramic foam porous medium (3) is close to premixing chamber (7), and described macroporous ceramic foam porous medium (2 ) away from the pre-mixing chamber (7), the ceramic particle bonding plate (13) is arranged between the small-pore foam ceramic porous medium (3) and the large-pore foam ceramic porous medium (2) to connect the two as a whole. 2. The anti-tempering premixed porous medium burner as claimed in claim 1, characterized in that: the thermal conductivity of the small-pore ceramic foam porous medium (3) is less than that of the large-pore ceramic foam porous medium (2) Thermal Conductivity. 3. The anti-tempering premixed porous medium burner according to claim 1, characterized in that: the average pore diameter of the small-pore foamed ceramic porous medium (3) is 10-20PPI, and the porosity is 75-85% ; The average pore diameter of the smaller-than-macropore foam ceramic porous medium (2) is 50-60PPI, and the porosity is 80-85%. 4. The anti-tempering premixed porous media burner as claimed in claim 1, characterized in that: the average pore diameter of the ceramic particle bonded plate (13) is 2-5PPI, and the porosity is 20-40% . 5. The anti-tempering premixed porous media burner according to claim 1, characterized in that: said mixed gas pipeline (12) has a built-in swirl plate.

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