A premixing device

Abstract

This utility model provides a premixing device, including an outer cylinder and a natural gas inlet pipe. The outer cylinder has a combustion air inlet pipe and a mixed gas outlet pipe on its two sides, respectively. The natural gas inlet pipe is fixed to the outer peripheral wall of the outer cylinder and communicates with its interior. A mixed gas outlet flange is provided on the outer side wall of the mixed gas outlet pipe, and the flange is integrated with the outlet pipe. By setting a natural gas orifice plate and a mixed gas turbulence orifice plate inside the outer cylinder, the natural gas can be evenly dispersed and fully mixed with the combustion air, improving the quality of the mixed gas and benefiting the subsequent combustion process, thus increasing combustion efficiency and stability.

Description

Technical Field

[0001] This utility model relates to the field of boiler accessories technology, and in particular to a premixing device. Background Technology

[0002] To reduce the NOx and other pollutant content in boiler flue gas and improve combustion efficiency, premixed burners are commonly used. This type of burner requires that natural gas and combustion air be mixed in a premixing chamber before combustion to form an unburned gas mixture, which is then delivered to the combustion device.

[0003] Mixing devices based on the Venturi principle are mostly suitable for front-end premixing (natural gas and combustion air are mixed first and then pressurized by a blower), and require high manufacturing precision and have high overall cost. The premixing chamber used in back-end premixing (combustion air is first pressurized by a blower and then mixed with natural gas) often has a complex structure and large size in order to ensure premixing performance, which makes the size of the entire burner very disproportionate to the boiler and the overall appearance very unattractive.

[0004] To address this problem, a premixing device is proposed here. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology and solve the problem that the premixing performance of existing premixing devices is generally poor, which affects the quality of the mixture and the subsequent combustion effect, this utility model provides a premixing device.

[0006] This utility model is achieved using the following technical solution:

[0007] A premixing device includes an outer cylinder of the premixing device and a natural gas inlet pipe. The outer cylinder of the premixing device is provided with a combustion air inlet pipe and a mixed gas outlet pipe on both sides. The natural gas inlet pipe is fixed on the outer peripheral wall of the outer cylinder of the premixing device and is connected to the inside of the outer cylinder of the premixing device.

[0008] The combustion air inlet pipe is provided with a combustion air inlet flange on its outer side wall, and the combustion air inlet flange is integrated with the combustion air inlet pipe. The mixed gas outlet pipe is provided with a mixed gas outlet flange on its outer side wall, and the mixed gas outlet flange is integrated with the mixed gas outlet pipe.

[0009] The combustion air inlet pipe and the mixed gas outlet pipe are partially installed inside the outer cylinder of the premixing device. A baffle is provided at the connection between the tail end of the combustion air inlet pipe and the outer cylinder of the premixing device, and a baffle is provided at the tail end of the mixed gas outlet pipe. Each baffle fixes the combustion air inlet pipe and the mixed gas outlet pipe to the outer cylinder of the premixing device.

[0010] The premixing device has a natural gas orifice plate and a mixed gas turbulence orifice plate inside its outer cylinder. The natural gas orifice plate is fixed on the outer peripheral wall of the combustion air inlet pipe and located between the baffles. The mixed gas turbulence orifice plate is installed on the side close to the mixed gas outlet pipe.

[0011] The combustion air inlet pipe is equipped with a wind pressure pipe and a wind pressure measuring port.

[0012] An air flow meter and an air flow regulating valve are installed inside the combustion air inlet flange, and a gas flow meter and a gas flow regulating valve are installed on the natural gas inlet flange.

[0013] The present invention has the following advantages over the prior art:

[0014] 1. By setting natural gas orifice plates and mixed gas turbulence orifice plates inside the outer cylinder of the premixing device, natural gas can be evenly dispersed and fully mixed with combustion air, which improves the quality of the mixed gas, is beneficial to the subsequent combustion process, and can improve combustion efficiency and combustion stability.

[0015] 2. The installed air flow meter, air flow regulating valve, gas flow meter and gas flow regulating valve can accurately measure and regulate the flow of natural gas and combustion air, and can flexibly adjust the mixing ratio according to different working conditions and needs, thereby improving energy utilization and reducing energy consumption. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the baffle structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the natural gas orifice plate structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the mixed gas turbulence perforated plate of this utility model;

[0020] Figure 5 This utility model relates to a combustion air inlet pipe.

[0021] In the diagram: 1. Combustion air inlet flange; 2. Combustion air inlet pipe; 3. Air pressure pipe; 4. Air pressure measuring port; 5. Natural gas inlet flange; 6. Natural gas inlet pipe; 7. Baffle; 8. Natural gas orifice plate; 9. Premixing device outer cylinder; 10. Mixed gas turbulence orifice plate; 11. Mixed gas outlet pipe; 12. Mixed gas outlet flange. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] like Figures 1 to 5 As shown, a premixing device includes a premixing device outer cylinder 9 and a natural gas inlet pipe 6. The two sides of the premixing device outer cylinder 9 are respectively provided with a combustion air inlet pipe 2 and a mixed gas outlet pipe 11. The natural gas inlet pipe 6 is fixed on the outer peripheral wall of the premixing device outer cylinder 9 and communicates with the inside of the premixing device outer cylinder 9, and is used to introduce natural gas into the premixing device outer cylinder 9.

[0025] The combustion air inlet pipe 2 is provided with a combustion air inlet flange 1 on its outer side wall. The combustion air inlet flange 1 is integrated with the combustion air inlet pipe 2. The mixed gas outlet pipe 11 is provided with a mixed gas outlet flange 12 on its outer side wall. The mixed gas outlet flange 12 is integrated with the mixed gas outlet pipe 11.

[0026] The combustion air inlet pipe 2 and the mixed gas outlet pipe 11 are partially inserted inside the outer cylinder 9 of the premixing device. A baffle 7 is provided at the connection between the tail of the combustion air inlet pipe 2 and the outer cylinder 9 of the premixing device, and a baffle 7 is provided at the tail of the mixed gas outlet pipe 11. Each baffle 7 fixes the combustion air inlet pipe 2 and the mixed gas outlet pipe 11 to the outer cylinder 9 of the premixing device. The baffle 7 serves to seal and fix the gas, preventing gas leakage.

[0027] The premixing device outer cylinder 9 is equipped with a natural gas orifice plate 8 and a mixed gas turbulence orifice plate 10. The natural gas orifice plate 8 is fixed on the outer peripheral wall of the combustion air inlet pipe 2 and located between the baffles 7. The mixed gas turbulence orifice plate 10 is installed on the side close to the mixed gas outlet pipe 11. After natural gas enters the premixing device outer cylinder 9 through the natural gas inlet pipe 6, it passes through the natural gas orifice plate 8, so that the natural gas can be evenly dispersed in the premixing device outer cylinder 9. When the natural gas and the combustion air are initially mixed, the mixed gas will generate turbulence when passing through the mixed gas turbulence orifice plate 10, which will further promote the full mixing of natural gas and combustion air.

[0028] The combustion air inlet pipe 2 is equipped with a wind pressure pipe 3 and a wind pressure measuring port 4. Wind pressure measuring equipment can be connected through the wind pressure pipe 3, and the wind pressure measuring port 4 is used to accurately measure the wind pressure in the combustion air inlet pipe 2 so as to understand the supply of combustion air in a timely manner.

[0029] An air flow meter and an air flow regulating valve are installed inside the combustion air inlet flange 1. The air flow meter can monitor the flow rate of the combustion air in real time, and the air flow regulating valve can adjust the flow rate of the combustion air according to actual needs. A gas flow meter and a gas flow regulating valve are installed on the natural gas inlet flange 5.

[0030] The working principle of this utility model is as follows: When in use, the combustion air is driven by the fan and enters the combustion air inlet pipe 2 through the combustion air inlet flange 1;

[0031] Natural gas enters the outer cylinder 9 of the premixing unit through the natural gas inlet flange and natural gas inlet pipe 6, then is pre-distributed through the natural gas orifice plate 8, and enters the combustion air inlet pipe 2 through the opening on the combustion air inlet pipe 2, where it is initially mixed with the flame retardant air.

[0032] After the combustion air and natural gas are initially mixed in the combustion air inlet pipe 2, they flow through the mixed gas turbulence orifice plate 10 for full mixing, and finally are delivered to the combustion part of the burner through the mixed gas outlet flange 12.

[0033] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A premixing device, characterized in that: It includes a premixing device outer cylinder (9) and a natural gas inlet pipe (6). The two sides of the premixing device outer cylinder (9) are respectively provided with a combustion air inlet pipe (2) and a mixed gas outlet pipe (11). The natural gas inlet pipe (6) is fixed on the outer peripheral wall of the premixing device outer cylinder (9) and communicates with the inside of the premixing device outer cylinder (9). The natural gas inlet pipe (6) is provided with a natural gas inlet flange (5). The combustion air inlet pipe (2) is provided with a combustion air inlet flange (1) on its outer side wall. The combustion air inlet flange (1) is connected to the combustion air inlet pipe (2) as a whole. The mixed gas outlet pipe (11) is provided with a mixed gas outlet flange (12) on its outer side wall. The mixed gas outlet flange (12) is connected to the mixed gas outlet pipe (11) as a whole. The combustion air inlet pipe (2) and the mixed gas outlet pipe (11) are partially installed inside the premixing device outer cylinder (9). A baffle (7) is provided at the connection between the tail of the combustion air inlet pipe (2) and the premixing device outer cylinder (9). A baffle (7) is provided at the tail of the mixed gas outlet pipe (11). Each baffle (7) fixes the combustion air inlet pipe (2) and the mixed gas outlet pipe (11) to the premixing device outer cylinder (9). The premixing device has a natural gas orifice plate (8) and a mixed gas turbulence orifice plate (10) inside the outer cylinder (9). The natural gas orifice plate (8) is fixed on the outer peripheral wall of the combustion air inlet pipe (2) and located between the baffles (7). The mixed gas turbulence orifice plate (10) is installed on the side close to the mixed gas outlet pipe (11).

2. The premixing device according to claim 1, characterized in that: The combustion air inlet pipe (2) is equipped with a wind pressure pipe (3) and a wind pressure measuring port (4).

3. The premixing device according to claim 1, characterized in that: An air flow meter and an air flow regulating valve are installed inside the combustion air inlet flange (1), and a gas flow meter and a gas flow regulating valve are installed on the natural gas inlet flange (5).

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