Natural gas combustion device for calcining of rotary kiln

Abstract

The utility model relates to the technical field of rotary kilns, in particular to a natural gas combustion device for rotary kiln calcination, which comprises a base, a rotary kiln barrel, a combustion tube and a mixing component, the rotary kiln barrel is mounted on the base, and the combustion tube extends into the rotary kiln barrel and is rotatably connected with the rotary kiln barrel. The mixing assembly comprises a mixing chamber, a stirring shaft, stirring blades, a motor, an air channel, a natural gas channel, a first monitoring component and a second monitoring component, the mixing chamber is arranged, so that air and natural gas can be fully mixed, and the problem that the natural gas can be fully combusted only when the natural gas and the air are fully mixed is solved; however, the problems that natural gas and air cannot be fully mixed by an existing combustion device of the rotary kiln, incomplete combustion is easily caused, and energy is wasted are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary kilns, in particular to a natural gas combustion device for calcining a rotary kiln. Background Art

[0002] A rotary kiln is a common device used in aluminum smelting. Natural gas is injected into the kiln head and combusted within the kiln. The heat generated raises the temperature inside the kiln, providing the high-temperature environment required for material processing. Heating the interior of a rotary kiln has long been a challenge in existing technologies. Conventional methods involve either installing heat pipes or burners. The first heat pipe approach suffers from poor stability and is prone to corrosion and breakage. The other burner approach, which adds multiple burners to achieve multi-angle heating, is difficult to assemble due to the rotary kiln's rotating cylinder, making it prone to damage and significantly inconvenient for subsequent maintenance.

[0003] The prior art CN207395456U discloses an energy-saving rotary kiln, comprising: a rotary kiln cylinder and a combustion device; the combustion device is arranged at the outlet end of the rotary kiln cylinder; one end of the combustion tube of the combustion device is connected to the outlet of the natural gas burner, and the other end passes through the ball head connector and extends into the interior of the rotary kiln cylinder, and the end is connected to a burner nozzle; the burner bracket is a hydraulic telescopic cylinder, the bottom of which is fixed to the upper end of the mobile trolley; the bottom of the natural gas burner is hinged to the top of the telescopic rod of the burner bracket; after the natural gas burner is started, the above technical solution finally realizes the flame spraying into the interior of the rotary kiln cylinder through the combustion tube and the burner nozzle, the pitch angle of the sprayed flame is realized by the extension and contraction of the burner bracket, and the left and right yaw angles of the sprayed flame are realized by the movement of the mobile trolley, so that an infinite cycle of multi-angle flame spraying can be formed by setting the regular extension and contraction of the burner bracket and the reciprocating movement of the mobile trolley on a fixed route.

[0004] Regarding the above-mentioned energy-saving rotary kiln, natural gas and air need to be fully mixed for full combustion of the natural gas. However, the combustion device of the existing rotary kiln cannot fully mix the natural gas and air, which easily leads to incomplete combustion and energy waste. Utility Model Content

[0005] The purpose of the utility model is to provide a natural gas combustion device for calcining in a rotary kiln, which solves the problem that natural gas and air need to be fully mixed for full combustion of natural gas, but the existing combustion device of the rotary kiln cannot fully mix natural gas and air, which easily leads to incomplete combustion and energy waste.

[0006] To achieve the above-mentioned objectives, the present invention provides a natural gas combustion device for calcining a rotary kiln, comprising a base, a rotary kiln cylinder, a combustion pipe and a mixing assembly, wherein the rotary kiln cylinder is mounted on the base, the combustion pipe extends into the rotary kiln cylinder and is rotatably connected to the rotary kiln cylinder, the mixing assembly comprises a mixing chamber, a stirring shaft, stirring blades, a motor, an air duct, a natural gas duct, a first monitoring component and a second monitoring component, the mixing chamber is communicated with the combustion pipe and is located on a side of the combustion pipe away from the rotary kiln cylinder, the stirring shaft extends into the mixing chamber and is rotatably connected to the mixing chamber, the stirring blade is fixedly connected to the stirring shaft and is located in the mixing chamber, the motor is fixedly connected to the mixing chamber, the output shaft of the motor is fixedly connected to the stirring shaft, the air duct is fixedly connected to the mixing chamber and is communicated with the mixing chamber, the natural gas duct is fixedly connected to the mixing chamber and is communicated with the mixing chamber, the first monitoring component is mounted on the air duct, and the second monitoring component is mounted on the natural gas duct.

[0007] Among them, the first monitoring component includes a filter, a first flow meter and a first regulating valve. The filter is fixedly connected to the air duct and is located at one end of the air duct away from the mixing chamber; the first flow meter extends into the air duct and is fixedly connected to the air duct; the first regulating valve is fixedly installed on the air duct.

[0008] Among them, the second monitoring component includes a second flow meter, a second regulating valve and a pressure sensor. The second flow meter extends into the natural gas pipeline and is fixedly connected to the natural gas pipeline; the second regulating valve is fixedly installed on the natural gas pipeline; the pressure sensor extends into the natural gas pipeline and is fixedly connected to the natural gas pipeline.

[0009] Wherein, the mixing assembly further includes a controller, which is fixedly mounted on the base and located on a side of the base close to the mixing chamber.

[0010] Wherein, the mixing assembly further includes a support frame, which is fixedly connected to the base and the mixing chamber.

[0011] The utility model discloses a natural gas combustion device for calcining a rotary kiln, comprising a base, a rotary kiln cylinder, a combustion pipe and a mixing assembly, wherein the rotary kiln cylinder is mounted on the base, the combustion pipe extends into the rotary kiln cylinder and is rotatably connected to the rotary kiln cylinder, the mixing assembly comprises a mixing chamber, a stirring shaft, stirring blades, a motor, an air duct, a natural gas duct, a first monitoring component and a second monitoring component, the mixing chamber is communicated with the combustion pipe and is located on a side of the combustion pipe away from the rotary kiln cylinder, the stirring shaft extends into the mixing chamber and is rotatably connected to the mixing chamber, and the stirring blades are fixedly connected to the stirring shaft , and is located in the mixing chamber, the motor is fixedly connected to the mixing chamber, the output shaft of the motor is fixedly connected to the stirring shaft, the air duct is fixedly connected to the mixing chamber and communicates with the mixing chamber, the natural gas duct is fixedly connected to the mixing chamber and communicates with the mixing chamber, the first monitoring component is installed on the air duct, and the second monitoring component is installed on the natural gas duct, which solves the problem that natural gas and air need to be fully mixed to fully burn the natural gas, but the combustion device of the existing rotary kiln cannot fully mix the natural gas and air, which easily leads to incomplete combustion and energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0013] Figure 1 It is a schematic diagram of the overall structure of a natural gas combustion device for calcining a rotary kiln according to the present invention.

[0014] Figure 2 It is a structural schematic diagram of the mixing chamber of the present utility model.

[0015] Figure 3 It is a structural schematic diagram of the first monitoring component and the second monitoring component of the utility model.

[0016] In the figure: 101-base, 102-rotary kiln cylinder, 103-combustion tube, 104-mixing chamber, 105-stirring shaft, 106-stirring blade, 107-motor, 108-air duct, 109-natural gas duct, 110-filter, 111-first flow meter, 112-first regulating valve, 113-second flow meter, 114-second regulating valve, 115-pressure sensor, 116-controller, 117-support frame. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0018] See also Figure 1-Figure 3 , Figure 1 This is a schematic diagram of the overall structure of the natural gas combustion device for rotary kiln calcination of the utility model. Figure 2 This is a schematic structural diagram of the mixing chamber 104 of the present invention. Figure 3 It is a structural schematic diagram of the first monitoring component and the second monitoring component of the utility model.

[0019] The utility model relates to a natural gas combustion device for calcining a rotary kiln, comprising a base 101, a rotary kiln body 102, a combustion tube 103, a mixing chamber 104, a stirring shaft 105, a stirring blade 106, a motor 107, an air passage 108, a natural gas passage 109, a filter 110, a first flow meter 111, a first regulating valve 112, a second flow meter 113, a second regulating valve 114, a pressure sensor 115, a controller 116, and a support frame 117. The utility model solves the problem that natural gas and air need to be fully mixed for full combustion, but existing rotary kiln combustion devices cannot fully mix natural gas and air, which easily leads to incomplete combustion and energy waste. It is understood that the above solution can also be used to improve combustion efficiency.

[0020] In this embodiment, the rotary kiln cylinder 102 and the combustion tube 103 are both existing technologies, and the specific structure refers to the existing technology CN207395456U. An energy-saving rotary kiln, through the mixing component, can fully mix natural gas and air, solving the problem that natural gas and air need to be fully mixed for full combustion, but the combustion device of the existing rotary kiln cannot fully mix natural gas and air, which easily leads to incomplete combustion and energy waste.

[0021] The mixing chamber 104 is connected to the combustion tube 103 and is located on the side of the combustion tube 103 away from the rotary kiln cylinder 102. The stirring shaft 105 extends into the mixing chamber 104 and is rotatably connected to the mixing chamber 104. The stirring blade 106 is fixedly connected to the stirring shaft 105 and is located in the mixing chamber 104. The motor 107 is fixedly connected to the mixing chamber 104, and the output shaft of the motor 107 is fixedly connected to the stirring shaft 105. The air duct 108 is fixedly connected to the mixing chamber 104 and is connected to the mixing chamber 104. The natural gas duct 108 is fixedly connected to the mixing chamber 104 and is connected to the mixing chamber 104. 09 is fixedly connected to the mixing chamber 104 and communicates with the mixing chamber 104. The first monitoring component is installed on the air duct 108, and the second monitoring component is installed on the natural gas duct 109. The mixing chamber 104 is a cylinder with an internal cavity, made of stainless steel, with good corrosion resistance and strength. The stirring shaft 105 extends into the mixing chamber 104 along the length direction of the mixing chamber 104 and is connected to the mixing chamber 104 through a sealed bearing. The shape and number of the stirring blades 106 are designed according to the size and mixing requirements of the mixing chamber 104, and a three-leaf spiral stirring blade is used. The blade 106 can generate a strong stirring force to promote the rapid mixing of natural gas and air. The motor 107 is fixed to the mixing chamber 104 by bolts and is used to drive the stirring shaft 105 to rotate. The stirring shaft 105 and the stirring blade 106 are driven by the motor 107 to rotate, thereby stirring the gas in the mixing chamber 104. The air duct 108 and the natural gas duct 109 are respectively arranged on both sides of the mixing chamber 104, both of which are metal pipes. One end of the air duct 108 is connected to the mixing chamber 104, and the other end is connected to the air source, so as to pass air into the mixing chamber 104. In the mixing chamber 104, one end of the natural gas passage 109 is connected to the mixing chamber 104, and the other end is connected to the natural gas source, so as to pass the natural gas into the mixing chamber 104. The first monitoring component and the second monitoring component are respectively used to monitor and regulate the input amounts of air and natural gas. By setting up the mixing chamber 104, the air and natural gas can be fully mixed, thereby solving the problem that the natural gas and air need to be fully mixed for the natural gas to be fully burned, but the combustion device of the existing rotary kiln cannot fully mix the natural gas and air, which easily leads to incomplete combustion and energy waste.

[0022] Secondly, the filter 110 is fixedly connected to the air duct 108 and is located at one end of the air duct 108 away from the mixing chamber 104; the first flow meter 111 extends into the air duct 108 and is fixedly connected to the air duct 108; the first regulating valve 112 is fixedly installed on the air duct 108, and the filter 110 is used to filter impurities in the air to ensure the cleanliness of the mixed gas. The first flow meter 111 is plug-in type and is inserted into the air duct 108 for installation, and can monitor the air flow in real time. The first regulating valve 112 is used to control the air flow. Through the first flow meter 111 and the first regulating valve 112, the air flow can be monitored and regulated.

[0023] At the same time, the second flow meter 113 extends into the natural gas channel 109 and is fixedly connected to the natural gas channel 109; the second regulating valve 114 is fixedly installed on the natural gas channel 109; the pressure sensor 115 extends into the natural gas channel 109 and is fixedly connected to the natural gas channel 109. The second flow meter 113 is also of an insertion type and is used to monitor the flow of natural gas. The second regulating valve 114 is used to control the flow of natural gas. The pressure sensor 115 is of an intrusive type and is installed in the natural gas channel 109 to monitor the pressure of natural gas and ensure the safety and stability of the mixing process. Through the second flow meter 113 and the second regulating valve 114, the natural gas flow can be monitored and regulated.

[0024] In addition, the controller 116 is fixedly mounted on the base 101 and is located on the side of the base 101 close to the mixing chamber 104. The controller 116 adopts a programmable logic controller for controlling various parts of the mixing device. The controller 116 can receive signals from the first flow meter 111, the second flow meter 113 and the pressure sensor 115, and control the actions of the first regulating valve 112 and the second regulating valve 114 actuators according to a preset program, thereby realizing automatic control of the mixing process.

[0025] Finally, the support frame 117 is fixedly connected to the base 101 and the mixing chamber 104 . The support frame 117 is used to provide support for the mixing chamber 104 . The mixing chamber 104 is stably supported by the support frame 117 .

[0026] In this embodiment, air and natural gas enter the mixing chamber 104 through the air passage 108 and the natural gas passage 109 respectively. After the air is filtered by the filter 110, the flow rate is controlled by the first flow meter 111 and the first regulating valve 112, and the air enters the mixing chamber 104. The flow rate and pressure of natural gas are controlled by the second flow meter 113, the second regulating valve 114 and the pressure sensor 115, and the natural gas enters the mixing chamber 104. The motor 107 is actuated to drive the stirring shaft 105 and the stirring blade 106 to rotate, stirring the mixed gas in the mixing chamber 104 to improve the uniformity of the mixing. The mixed gas enters the rotary kiln cylinder 102 through the combustion tube 103 for combustion. The present application provides the mixing chamber 104 so that the air and natural gas can be fully mixed, thereby solving the problem that the natural gas and air need to be fully mixed for full combustion, but the combustion device of the existing rotary kiln cannot fully mix the natural gas and air, which easily leads to incomplete combustion and energy waste.

[0027] The above disclosure is merely one or more preferred embodiments of the present application and is not intended to limit the scope of the present application. A person skilled in the art will understand that all or part of the processes of the above embodiments and equivalent changes made in accordance with the claims of the present application are still within the scope of the present application.

Claims

1. A natural gas combustion device for calcining a rotary kiln, comprising a base, a rotary kiln cylinder and a combustion pipe, wherein the rotary kiln cylinder is mounted on the base, and the combustion pipe extends into the rotary kiln cylinder and is rotatably connected to the rotary kiln cylinder, characterized in that: Also included are hybrid components; The mixing assembly includes a mixing chamber, a stirring shaft, a stirring blade, a motor, an air duct, a natural gas duct, a first monitoring component and a second monitoring component. The mixing chamber is communicated with the combustion pipe and is located on the side of the combustion pipe away from the rotary kiln cylinder. The stirring shaft extends into the mixing chamber and is rotatably connected to the mixing chamber. The stirring blade is fixedly connected to the stirring shaft and is located in the mixing chamber. The motor is fixedly connected to the mixing chamber, and the output shaft of the motor is fixedly connected to the stirring shaft. The air duct is fixedly connected to the mixing chamber and communicates with the mixing chamber. The natural gas duct is fixedly connected to the mixing chamber and communicates with the mixing chamber. The first monitoring component is installed on the air duct, and the second monitoring component is installed on the natural gas duct.

2. The natural gas combustion device for rotary kiln calcination according to claim 1, characterized in that: The first monitoring component includes a filter, a first flow meter and a first regulating valve. The filter is fixedly connected to the air duct and is located at one end of the air duct away from the mixing chamber; the first flow meter extends into the air duct and is fixedly connected to the air duct; the first regulating valve is fixedly installed on the air duct.

3. The natural gas combustion device for rotary kiln calcination according to claim 1, characterized in that: The second monitoring component includes a second flow meter, a second regulating valve and a pressure sensor. The second flow meter extends into the natural gas pipeline and is fixedly connected to the natural gas pipeline; the second regulating valve is fixedly installed on the natural gas pipeline; the pressure sensor extends into the natural gas pipeline and is fixedly connected to the natural gas pipeline.

4. The natural gas combustion device for rotary kiln calcination according to claim 1, characterized in that: The mixing assembly further includes a controller, which is fixedly mounted on the base and located on a side of the base close to the mixing chamber.

5. The natural gas combustion device for rotary kiln calcination according to claim 1, characterized in that: The mixing assembly further includes a support frame, which is fixedly connected to the base and the mixing chamber.

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