Dual-fuel mixed combustion device

Abstract

The utility model relates to the technical field of gas combustion devices, in particular to a dual-fuel mixed combustion device which comprises a shell, a natural gas distribution pipe is fixedly installed in the shell, a natural gas pipe is fixedly installed in the natural gas distribution pipe, a primary air inlet pipe is fixedly installed on the surface of the natural gas distribution pipe, and a secondary air inlet pipe is fixedly installed on the surface of the primary air inlet pipe. A natural gas nozzle is fixedly installed at the front end of the natural gas pipe, and a natural gas inlet is formed in the tail of the natural gas pipe. In the utility model, the air fed into the burner by the air blower is divided into the primary air duct and the secondary air duct, so that the natural gas and the coal gas are respectively provided with independent air distribution systems. Various combustion states of independent combustion of natural gas, independent combustion of coal gas and mixed combustion of the natural gas and the coal gas are achieved, backflow air is combined with a secondary air flue, the proportion of the oxygen content in the air is reduced, oxygen-deficient combustion of different degrees is further achieved, generation of NOx is reduced, and low-nitrogen combustion is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas combustion devices, in particular to a dual-fuel mixed combustion device. Background Art

[0002] When a gas-fired boiler burns coal gas, due to the complex composition and high levels of impurities in the gas, the gas nozzle of the combustion device may become clogged after a period of operation. This makes it difficult to increase the boiler load, resulting in low steam production and reduced quality, affecting the steam usage of the steam user. When this occurs, the boiler must be shut down, the combustion device with the clogged gas nozzle removed and cleaned, and then reinstalled on the gas-fired boiler to resume production. This results in discontinuous boiler operation, easily causing equipment damage, and seriously affecting the normal production activities of the steam user, reducing production efficiency. Therefore, a simple, multi-proportionally adjustable coal gas and natural gas dual-fuel combustion device is needed to compensate for the shortcomings of pure coal gas combustion devices. Utility Model Content

[0003] The purpose of this utility model is to solve the technical problems raised in the above background technology.

[0004] The utility model adopts the following technical solution: a dual-fuel mixed combustion device, comprising a shell, a natural gas air distribution pipe is fixedly installed inside the shell, a natural gas pipe is fixedly installed inside the natural gas air distribution pipe, a primary air inlet pipe is fixedly installed on the surface of the natural gas air distribution pipe, a natural gas nozzle is fixedly installed on the front end of the natural gas pipe, a natural gas inlet is provided at the tail end of the natural gas pipe, a coal gas pipe is fixedly installed inside the shell, a coal gas air distribution pipe is fixedly installed outside the coal gas pipe, a secondary air inlet pipe is fixedly installed on the surface of the gas air distribution pipe, an adjusting damper is fixedly installed at the air outlet of the secondary air inlet pipe, a gas nozzle is fixedly installed on the front end of the coal gas pipe, a gas inlet is provided at the tail end of the coal gas pipe, a natural gas ignition pipe is fixedly installed inside the natural gas air distribution pipe, and an igniter is fixedly installed on the surface of the natural gas ignition pipe.

[0005] Preferably, the natural gas inlet is connected to the natural gas pipeline, the primary air inlet is connected to the natural gas pipeline and the combustion air, and the tail of the primary air inlet is sealed. This optimizes the natural gas supply system and air supply method, effectively controlling the amount of air required for combustion and achieving a more precise air and natural gas mixing ratio, improving combustion efficiency and helping to reduce fuel consumption, thereby saving energy and reducing emissions.

[0006] Preferably, the gas inlet is connected to the gas pipe, and the secondary air inlet is connected to the gas distribution pipe. This ensures efficient distribution of gas supply and combustion air, optimizes the combustion process, enhances combustion completeness, thereby improving combustion efficiency and reducing harmful emissions.

[0007] Preferably, a rear cover is fixedly mounted on the surface of the housing, and the gas pipe is fixed on the rear cover. Here, the gas pipe can be quickly cleaned or replaced, reducing equipment downtime and improving production efficiency.

[0008] Preferably, a vane-adjusting valve is fixedly mounted on the surface of the housing, with vanes fixedly mounted at the rear end of the vane-adjusting valve. A fixed pipe for an air distributor is also fixedly mounted on the surface of the housing, communicating with the gas distribution pipe. This allows for precise control of the air flow entering the combustion chamber. Adjusting the vane position can alter the air flow rate and velocity, thereby optimizing combustion conditions, achieving a more stable and efficient combustion process, and reducing energy consumption.

[0009] Preferably, a gas orifice plate is fixedly mounted inside the natural gas air distribution pipe, and the natural gas pipe is fixed to the gas orifice plate. This allows the natural gas to be evenly distributed before entering the combustion zone, improving the mixing effect of natural gas and air, thereby optimizing the combustion process, increasing combustion efficiency, and reducing the possibility of incomplete combustion.

[0010] Compared with the prior art, the advantages and positive effects of the present invention are:

[0011] 1. This utility model design divides the air sent to the burner by the blower into primary and secondary air ducts, realizing independent air distribution systems for natural gas and coal gas. This enables multiple combustion states, including natural gas combustion alone, coal gas combustion alone, and mixed combustion of natural gas and coal gas.

[0012] 2. The utility model combines the return air with the secondary air duct to reduce the proportion of oxygen content in the air, further realize different degrees of oxygen-poor combustion, reduce the generation of NOx, and achieve low-nitrogen combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of a dual-fuel mixed combustion device proposed in the utility model;

[0014] Figure 2 The utility model provides a side view of a dual-fuel mixed combustion device.

[0015] Legend:

[0016] 1. Secondary air inlet pipe; 2. Adjusting damper; 3. Rear cover; 4. Primary air inlet pipe; 5. Natural gas inlet; 6. Coal gas inlet; 7. Natural gas ignition pipe; 8. Ignitor; 9. Blade regulating valve; 10. Housing; 11. Air distributor fixing pipe; 12. Natural gas pipe; 13. Blades; 14. Coal gas pipe; 15. Coal gas distribution pipe; 16. Coal gas nozzle; 17. Natural gas distribution pipe; 18. Gas orifice plate; 19. Natural gas nozzle. DETAILED DESCRIPTION

[0017] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0018] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0019] Example

[0020] See also Figure 1-2The utility model provides a technical solution: a dual-fuel mixed combustion device, including a shell 10, a natural gas air distribution pipe 17 is fixedly installed inside the shell 10, a natural gas pipe 12 is fixedly installed inside the natural gas air distribution pipe 17, a primary air inlet pipe 4 is fixedly installed on the surface of the natural gas air distribution pipe 17, a natural gas nozzle 19 is fixedly installed on the front end of the natural gas pipe 12, a natural gas inlet 5 is provided at the tail end of the natural gas pipe 12, the natural gas inlet 5 is communicated with the natural gas pipe 12, the primary air inlet pipe 4 is communicated with the natural gas pipe 12 and the combustion air, and the tail end of the primary air inlet pipe 4 is sealed, which optimizes the natural gas supply system and the air supply The method effectively controls the amount of air required for combustion, achieves a more accurate mixing ratio of air and natural gas, improves combustion efficiency, and helps reduce fuel consumption, thereby saving energy and reducing emissions. A gas orifice plate 18 is fixedly installed inside the natural gas air distribution pipe 17, and the natural gas pipe 12 is fixed on the gas orifice plate 18, which can make the natural gas evenly distributed before entering the combustion zone, thereby improving the mixing effect of natural gas and air, thereby optimizing the combustion process, improving combustion efficiency, and reducing the possibility of incomplete combustion. A gas pipe 14 is fixedly installed inside the shell 10, and a gas air distribution pipe 15 is fixedly installed outside the gas pipe 14. The gas air distribution pipe 15 is fixedly installed outside the gas pipe 14. A secondary air inlet pipe 1 is fixedly installed on the surface of the pipe 15, and an adjusting damper 2 is fixedly installed at the air outlet of the secondary air inlet pipe 1. A gas nozzle 16 is fixedly installed at the front end of the gas pipe 14, and a gas inlet 6 is opened at the tail end of the gas pipe 14. The gas inlet 6 is communicated with the gas pipe 14 respectively, and the secondary air inlet pipe 1 is communicated with the gas distribution pipe 15, ensuring the effective distribution of gas supply and combustion air, optimizing the combustion process, enhancing combustion completeness, thereby improving combustion efficiency and reducing harmful emissions. A rear cover 3 is fixedly installed on the surface of the shell 10, and the gas pipe 14 is fixed on the rear cover 3, so that the gas pipe 14 can be quickly cleaned or replaced, reducing The downtime of the equipment is reduced and the production efficiency is improved. A blade 13 regulating valve 9 is fixedly installed on the surface of the shell 10, and a blade 13 is fixedly installed on the tail end of the blade 13 regulating valve 9. An air distributor fixed pipe 11 is fixedly installed on the surface of the shell 10. The air distributor fixed pipe 11 is communicated with the gas air distribution pipe 15, allowing fine control of the air flow entering the combustion chamber. By adjusting the position of the blade 13, the air flow and flow rate can be changed, thereby optimizing the combustion conditions, helping to achieve a more stable and efficient combustion process, and reducing energy consumption. A natural gas ignition pipe 7 is fixedly installed inside the natural gas air distribution pipe 17, and an igniter 8 is fixedly installed on the surface of the natural gas ignition pipe 7.

[0021] Working Principle: Through the built-in natural gas and coal gas supply system, combined with primary and secondary air ducts and return air technology, the ratio and quality of the combustion air are effectively controlled, thereby significantly reducing the generation of nitrogen oxides. This combustion method not only optimizes the combustion process, but also adjusts the flow ratio of coal gas and natural gas according to actual needs, achieving flexible switching of combustion states to meet the needs of different operating conditions, ensuring the efficient and stable operation of the boiler, while avoiding the need for frequent shutdowns and cleaning due to nozzle blockage, greatly reducing equipment wear and maintenance costs, and extending the service life of the boiler. At the same time, this design reduces operating costs, and due to its high efficiency and low emissions, it helps achieve the goal of energy conservation and emission reduction, with a smaller impact on the environment.

[0022] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any other form. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification, equivalent change and modification of the above embodiment made according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A dual-fuel mixed combustion device, comprising a housing (10), characterized in that: A natural gas air distribution pipe (17) is fixedly installed inside the shell (10), a natural gas pipe (12) is fixedly installed inside the natural gas air distribution pipe (17), a primary air inlet pipe (4) is fixedly installed on the surface of the natural gas air distribution pipe (17), a natural gas nozzle (19) is fixedly installed at the front end of the natural gas pipe (12), a natural gas inlet (5) is provided at the rear end of the natural gas pipe (12), a coal gas pipe (14) is fixedly installed inside the shell (10), and the outer surface of the coal gas pipe (14) is fixedly installed. A gas distribution pipe (15) is fixedly installed at the top, a secondary air inlet pipe (1) is fixedly installed on the surface of the gas distribution pipe (15), and an adjusting damper (2) is fixedly installed at the air outlet of the secondary air inlet pipe (1). A gas nozzle (16) is fixedly installed at the front end of the gas pipe (14), and a gas inlet (6) is opened at the tail end of the gas pipe (14). A natural gas ignition pipe (7) is fixedly installed inside the natural gas distribution pipe (17), and an igniter (8) is fixedly installed on the surface of the natural gas ignition pipe (7).

2. The dual-fuel mixed combustion device according to claim 1, characterized in that: The natural gas inlet (5) is in communication with the natural gas pipe (12), the primary air inlet pipe (4) is in communication with the natural gas pipe (12) and the combustion-supporting air, and the tail of the primary air inlet pipe (4) is sealed.

3. The dual-fuel mixed combustion device according to claim 1, characterized in that: The gas inlet (6) is communicated with the gas pipe (14) respectively, and the secondary air inlet pipe (1) is communicated with the gas distribution pipe (15).

4. The dual-fuel mixed combustion device according to claim 1, characterized in that: A rear cover (3) is fixedly mounted on the surface of the housing (10), and a gas pipe (14) is fixed on the rear cover (3).

5. The dual-fuel mixed combustion device according to claim 1, characterized in that: A blade regulating valve (9) is fixedly mounted on the surface of the housing (10), a blade (13) is fixedly mounted on the tail end of the blade regulating valve (9), and an air distributor fixed pipe (11) is fixedly mounted on the surface of the housing (10), the air distributor fixed pipe (11) being in communication with a gas air distribution pipe (15).

6. The dual-fuel mixed combustion device according to claim 1, characterized in that: A gas orifice plate (18) is fixedly installed inside the natural gas air distribution pipe (17), and the natural gas pipe (12) is fixed on the gas orifice plate (18).

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