CN218154188U

CN218154188U - Energy-saving low-nitrogen combustion device

Info

Publication number: CN218154188U
Application number: CN202222591035.XU
Authority: CN
Inventors: 张善思; 李刚; 张辉
Original assignee: Henan Yincheng Energy Saving And Environmental Protection Equipment Sales Co ltd
Current assignee: Henan Yincheng Energy Saving And Environmental Protection Equipment Sales Co ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2022-12-27
Anticipated expiration: 2032-09-29

Abstract

The utility model discloses an energy-saving low-nitrogen combustion device, including the boiler body, air heater, the chimney, air-blower and combustor, the combustor includes casing and combustion head, the combustion head is located the boiler body, air heater is equipped with recirculation gas inlet, combustion gas export and recirculation gas outlet, the boiler body passes through pipeline and air heater's combustion gas inlet and links to each other, air heater's combustion gas outlet passes through the flue and the chimney links to each other, the chimney passes through gas recirculation pipeline and the air-blower links to each other, the air-blower passes through pipeline and air heater's recirculation gas inlet and links to each other, air heater's recirculation gas outlet passes through the air intake of hot-blast air inlet pipeline and combustor and links to each other, thereby make partial flue gas in the chimney and the inspiratory fresh air of air-blower mix and get into the combustor through the air-blower and recycle after the combustion gas heat transfer of air heater and boiler body.

Description

Energy-saving low-nitrogen combustion device

Technical Field

The utility model relates to a boiler equipment field, concretely relates to energy-saving low-nitrogen combustion apparatus.

Background

The flue gas recirculation (FGR for short) technology is characterized in that part of low-temperature flue gas is extracted from the tail of a boiler, is introduced to an air inlet of a combustor, is mixed with combustion-supporting air and then is sent into the boiler to participate in auxiliary combustion and thermodynamic flow field integration. The method is characterized in that the characteristics of low temperature and low oxygen of the flue gas are utilized, part of the flue gas is sprayed into the hearth again, the local temperature in the hearth is reduced, a local reducing atmosphere is formed, and the generated NOx is reduced, so that the generation of the NOx is inhibited. Flue gas recirculation is a low nitrogen combustion technology that is currently in use.

The technology is based on that 2016 countries are strongly grasping environment protection, replacing natural gas and oil-fired boilers of coal-fired boilers, and stipulating new boiler emission standards, and finding new problems and problems in the actual installation process, therefore, a smoke gas recirculation boiler which not only avoids the problem of flame detector failure caused by overhigh temperature of inlet air of smoke gas recirculation (FGR) and easy generation of high temperature, but also can meet the requirement of environment protection is urgently needed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an energy-saving low-nitrogen combustion device.

Based on the above purpose, the utility model adopts the following technical scheme:

the utility model provides an energy-saving low-nitrogen combustion device, including boiler body, air heater, the chimney, air-blower and combustor, the combustor includes casing and combustion head, the combustion head is located boiler body, air heater is equipped with recirculation gas inlet, the combustion gas inlet, combustion gas export and recirculation gas outlet, boiler body passes through the pipeline and links to each other with air heater's combustion gas inlet, air heater's combustion gas outlet passes through the flue and links to each other with the chimney, the chimney passes through gas recirculation pipeline and links to each other with the air-blower, the air-blower passes through the pipeline and air heater's recirculation gas inlet links to each other, air heater's recirculation gas outlet passes through the air intake of hot air intake pipe and combustor and links to each other, the air-blower still is equipped with air intake and is used for inhaling fresh air to make partial flue gas in the chimney and the fresh air that the air-blower inhales mix and get into the combustor through the air heater and enter the combustor after the combustion gas heat transfer of boiler body and recycle.

Furthermore, the air blower comprises a blower volute and a blower motor, and an air inlet and air quantity controller is arranged on an air inlet of the air blower.

Furthermore, a fuel pipeline and a flame detector connecting pipe are arranged on the combustor shell, and a compressed air connecting pipe is arranged on the flame detector connecting pipe.

Further, a fuel control valve is arranged on the fuel pipeline.

Further, a smoke recirculation flow control valve is arranged in the smoke recirculation pipeline.

The utility model discloses an actively the effect: the utility model provides high air inlet temperature has reduced thereby boiler exhaust gas temperature and has improved boiler thermal efficiency, thereby reduces the unit and uses fuel cost, thereby set up the compressed air connecting pipe and avoided making the malfunctioning drawback of flame detector because of air inlet temperature is too high (because combustor air intake high temperature makes the flame detector produce false signal easily, produces the high temperature warning) on the flame detector connecting pipe, the utility model discloses the air inlet mode of conventional end nitrogen burner has been changed, has improved air inlet temperature, has avoided the high temperature trouble, has further improved the fuel utilization ratio, has saved the valuable energy, designs ingeniously and makes the high temperature part not have any rotating part to a lot of troubles have been avoided.

Drawings

FIG. 1 is a schematic diagram of the operation of the present invention;

fig. 2 is a schematic structural diagram of the present invention;

FIG. 3 is a left side view of FIG. 2;

in the figure: 1. the boiler comprises a boiler body, 2. An air preheater, 3. A chimney, 4. A blower, 5. A flue, 6. A flue gas recirculation pipeline, 7. A flue gas recirculation flow control valve, 8. An air inlet quantity controller, 9. A blower motor, 10. A blower volute, 11. A hot air inlet pipeline, 12. A shell, 13. A combustion head, 14. A fuel pipeline, 15. A fuel control valve, 16. A flame detector connecting pipe and 17. A compressed air connecting pipe.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to the accompanying drawings, but the scope of the present invention is not limited thereto.

Example 1

An energy-saving low-nitrogen combustion device is shown in figures 1 to 3 and comprises a boiler body 1, an air preheater 2, a chimney 3, an air blower 4 and a burner, wherein the burner comprises a shell 12 and a burner head 13, the burner head 13 is positioned in the boiler body 1, the air preheater 2 is provided with a recirculation smoke inlet, a recirculation smoke outlet, a combustion smoke inlet and a combustion smoke outlet, the boiler body 1 is connected with the combustion smoke inlet of the air preheater 2 through a pipeline, the combustion smoke outlet of the air preheater 2 is connected with the chimney 3 through a flue 5, the chimney 3 is connected with the air blower 4 through a smoke recirculation pipeline 6, the air blower 4 is connected with the recirculation smoke inlet of the air preheater 2 through a pipeline, the recirculation smoke outlet of the air preheater 2 is connected with an air inlet of the burner through a hot air inlet pipeline 11, the air blower is further provided with an air inlet for fresh air suction, so that part of smoke in the chimney 3 and fresh air sucked by the air blower 4 are mixed and enter the burner for recirculation after heat exchange with the combustion smoke in the air preheater 2 and entering the air blower body 1 through the air blower 4.

In this embodiment, the blower 4 includes a blower volute 10 and a blower motor 9, and an air inlet of the blower 4 is provided with an air inlet volume controller 8.

In this embodiment, the burner housing 12 is provided with a fuel pipeline 14 and a flame detector connecting pipe 16, and the flame detector connecting pipe 16 is provided with a compressed air connecting pipe 17.

In this embodiment, a fuel control valve 15 is disposed on the fuel pipeline 14.

In this embodiment, a flue gas recirculation flow control valve 7 is arranged in the flue gas recirculation pipeline 6.

The utility model discloses the theory of operation is: the fresh air sucked by the blower 4 and the recirculated flue gas are mixed by the blower 4 and then sent into the air preheater 2, the inlet air temperature is increased after heat exchange with the combustion flue gas coming out from the boiler body 1, the mixture is sent into the combustion head 13 through the hot air inlet pipeline 11 and then enters the hearth, the residual air in the boiler is replaced by the fresh air, then a tiny flame appears in front of the combustion head after the ignition electromagnetic valve (ignition) is started, the flame detector can detect the flame, then the fuel control valve 15 is started and the supply amount is controlled, the air and the fuel are mixed and then sent into the hearth for combustion, and the control principle of the air and fuel mixed combustion device is basically consistent with that of a common bottom nitrogen combustor.

Finally, it should be noted that: the above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and those skilled in the art should understand that any equivalent substitution or obvious modification of the embodiments of the present invention without changing the performance or usage thereof without departing from the spirit of the present invention should be covered within the scope of the present invention.

Claims

1. An energy-saving low-nitrogen combustion device is characterized by comprising a boiler body, an air preheater, a chimney, an air blower and a combustor, wherein the combustor comprises a shell and a combustion head, the combustion head is positioned in the boiler body, the air preheater is provided with a recirculation flue gas inlet, a combustion flue gas outlet and a recirculation flue gas outlet, the boiler body is connected with the combustion flue gas inlet of the air preheater through a pipeline, the combustion flue gas outlet of the air preheater is connected with the chimney through a flue, the chimney is connected with the air blower through a flue gas recirculation pipeline, the air blower is connected with the recirculation flue gas inlet of the air preheater through a pipeline, the recirculation flue gas outlet of the air preheater is connected with an air inlet of the combustor through a hot air inlet pipeline, the air blower is further provided with an air inlet for sucking fresh air, and therefore, part of flue gas in the chimney and the sucked fresh air are mixed and enter the air preheater through the air blower to exchange heat with the combustion flue gas of the boiler body and then enter the combustor to be recirculated; the combustor shell is provided with a fuel pipeline and a flame detector connecting pipe, and the flame detector connecting pipe is provided with a compressed air connecting pipe.

2. The energy-saving low-nitrogen combustion device as claimed in claim 1, wherein the blower comprises a blower volute and a blower motor, and an air inlet controller is arranged on the air inlet of the blower.

3. The energy-saving low-nitrogen combustion device according to claim 1, wherein a fuel control valve is provided on the fuel pipeline.

4. The energy-saving low-nitrogen combustion device according to claim 1, wherein a flue gas recirculation flow control valve is arranged in the flue gas recirculation pipeline.