A pulse-type low-nitrogen burner

Abstract

The present invention relates to a pulse-type low-nitrogen burner, which comprises a gas feeding assembly, a combustion tube, a combustion-supporting air inlet assembly and a PLC control system; the gas feeding assembly includes a feeding pipe, a mixing pipe and at least two feeding pipelines, and a gas regulating valve is installed on each feeding pipeline; one end of the combustion tube has a gas inlet, and the other end of the combustion tube is a combustion end; the combustion-supporting air inlet assembly includes an air inlet pipe and an air supply pipeline, one end of the air supply pipeline is communicated with the air inlet pipe, and the other end is communicated with the combustion tube. An air volume regulating valve is installed on each air supply pipeline, and the combustion-supporting air inlet assembly is arranged close to the combustion end; all the gas regulating valves and all the air volume regulating valves are connected to the PLC control system. This burner can generate a very small amount of NO during the whole combustion process through pulse-type low-nitrogen combustion control x .

Description

Technical Field

[0001] The present invention relates to the field of manufacturing of thermal equipment for kilns, and particularly relates to a pulse type low-nitrogen burner. Background Art

[0002] Since the birth of gas low-nitrogen combustion technology in the 1980s, it has been widely applied to power plant boilers and cement rotary kilns, and is mainly applied to pulverized coal gas. However, with the increasingly strict national energy conservation and environmental protection policies, this technology has gradually been extended to various industrial kilns.

[0003] Currently, there is no dedicated low-nitrogen burner for rotary kilns on the market. In order to achieve low-nitrogen combustion of gas and promote energy conservation and emission reduction of various rotary kilns using gas, it is necessary to design a new type of low-nitrogen burner. Summary of the Invention

[0004] Based on the above description, the present invention provides a pulse type low-nitrogen burner to achieve low-nitrogen combustion of gas and promote energy conservation and emission reduction of various rotary kilns using gas.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A pulse type low-nitrogen burner, characterized in that it includes a gas feeding assembly, a combustion tube, a combustion-supporting air inlet assembly, and a PLC control system;

[0007] The gas feeding assembly includes a feeding pipe for feeding, a mixing pipe for discharging, and at least two feeding pipelines connected and installed between the feeding pipe and the mixing pipe. A gas regulating valve is installed on each feeding pipeline;

[0008] One end of the combustion tube has a gas inlet communicated with the discharging end of the mixing pipe, and the other end of the combustion tube is a combustion end for ignition and combustion;

[0009] The combustion-supporting air inlet assembly includes an air inlet pipe for air inlet and at least two air supply pipelines for air outlet. One end of the air supply pipeline is communicated with the air inlet pipe, and the other end is communicated with the combustion tube. An air volume regulating valve is installed on each air supply pipeline. The combustion-supporting air inlet assembly is arranged close to the combustion end;

[0010] All the gas regulating valves and all the air volume regulating valves are connected to the PLC control system. The gas regulating valves and the air volume regulating valves correspond to different combustion conditions according to different opening and closing states. The PLC control system can control the gas regulating valves and the air volume regulating valves to achieve instantaneous transformation of different combustion conditions.

[0011] Compared with the prior art, the technical solution of the present application has the following beneficial technical effects:

[0012] When the pulse - type low - nitrogen burner provided by the present invention is in use, gas enters different feeding pipelines from the gas feeding pipe respectively. The PLC control system can adjust the gas volume in each feeding pipeline through the gas regulating valves on each feeding pipeline. Similarly, the combustion - supporting air enters different air - supply pipelines from the combustion - supporting air inlet pipe respectively. The PLC control system can adjust the combustion - supporting air volume in each air - supply pipeline through the air volume regulating valves on each air - supply pipeline. The gas regulating valves and the air volume regulating valves correspond to different combustion conditions according to different opening and closing states. The PLC control system can realize the instantaneous conversion of the combustion conditions of the pulse - type low - nitrogen burner by controlling the opening and closing states of the gas regulating valves and the air volume regulating valves, and then achieve the effect of pulse - type regulation, enabling the gas and air to fully contact and burn out, and thus generating a very small amount of NO x , and then realizing the pulse - type low - nitrogen combustion effect.

[0013] Based on the above - mentioned technical solution, the present invention can be further improved as follows.

[0014] Further, the feeding pipeline includes a first feeding pipeline and a second feeding pipeline. One ends of the first feeding pipeline and the second feeding pipeline are sequentially connected and installed on the feeding pipe, and the other ends are sequentially connected and installed on the mixing pipe.

[0015] Further, the air - supply pipeline includes a first air - supply pipeline and a second air - supply pipeline. One ends of the first air - supply pipeline and the second air - supply pipeline are sequentially connected and installed on the air inlet pipe, and the other ends are sequentially connected and installed on the combustion pipe.

[0016] Further, different - specification gas nozzles are respectively installed at one ends of the first feeding pipeline and the second feeding pipeline close to the mixing pipe; different - specification gas nozzles are respectively installed at one ends of the first air - supply pipeline and the second air - supply pipeline close to the combustion pipe.

[0017] Further, the combustion pipe successively includes an air - inlet section, a first compensation section, a first mixing section, a second compensation section, a second mixing section, and a combustion section from the gas inlet to the combustion end; the first air - supply pipeline is communicated with the first mixing section, the second air - supply pipeline is communicated with the second mixing section, and the lengths of the first compensation section and the second compensation section are adjustable.

[0018] Further, the first compensation section and the second compensation section are respectively installed with a first length adjustment device and a second length adjustment device. Both the first length adjustment device and the second length adjustment device are connected to the PLC control system. The first compensation section and the second compensation section correspond to different combustion conditions according to different lengths, and the PLC control system can control the first length adjustment device and the second length adjustment device to achieve instantaneous transformation of different combustion conditions.

[0019] Further, the air inlet pipe includes an air inlet section and a corrugated compensation section. The corrugated compensation section is located at one end of the air inlet section away from the air inlet end. The first air supply pipeline is connected and installed to the air inlet section, and the second air supply pipeline is connected and installed to the end of the corrugated compensation section away from the air inlet section.

[0020] Further, the combustion end is located at one end of the combustion section, and heat-resistant materials and castables are fixed to the outside of the combustion section by fasteners. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the pulse type low-nitrogen burner provided by the embodiment of the present invention;

[0022] Figure 2 is Figure 1 the installation structural diagram of the gas feeding assembly in

[0023] Figure 3 is Figure 1 the installation structural diagram of the combustion-supporting air inlet assembly in

[0024] Figure 4 is the control principle block diagram of the control system of the present invention. Detailed Embodiments

[0025] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0027] It will be appreciated that spatial relationship terms such as "under", "below", "lower", "beneath", "above", "upper", etc. can be used herein to describe the relationship of one element or feature shown in the figures with other elements or features. It should be understood that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the attached drawings is flipped, an element or feature described as "under other elements" or "beneath them" or "under it" will be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "beneath" can include both the upper and lower orientations. In addition, the device can also have additional orientations (such as being rotated 90 degrees or other orientations), and the spatial descriptors used herein are to be interpreted accordingly.

[0028] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In the following embodiments, "connection", if there is a transfer of electrical signals or data between the connected circuits, modules, units, etc., should be understood as "electrically connected", "communicatively connected", etc.

[0029] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprise / include" or "have" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0030] As Figures 1 to 3 shown, an embodiment of the present application provides a pulse-type low-nitrogen burner, which includes a gas feeding assembly 1, a combustion tube 2, a combustion-supporting air inlet assembly 3 and a PLC control system 4.

[0031] The gas feeding assembly 1 includes a feeding pipe 11 for feeding, a mixing pipe 12 for discharging, and two feeding pipelines communicatively installed between the feeding pipe 11 and the mixing pipe 12. In other embodiments, the number of feeding pipelines can also be designed as multiple according to needs. In this embodiment, the feeding pipelines include a first feeding pipeline 13 and a second feeding pipeline 14. One ends of the first feeding pipeline 13 and the second feeding pipeline 14 are sequentially communicatively installed on the feeding pipe 11, and the other ends are sequentially communicatively installed on the mixing pipe 12. A first gas regulating valve 131 is installed on the first feeding pipeline 13, and a second gas regulating valve 141 is installed on the second feeding pipeline 14.

[0032] To ensure the smooth ejection of gas and facilitate the adjustment of the gas volume in different feeding pipelines, gas nozzles of different specifications are respectively installed at one ends of the first feeding pipeline 13 and the second feeding pipeline 14 close to the mixing pipe 12.

[0033] One end of the combustion pipe 2 has a gas inlet communicating with the discharge end of the mixing pipe 12, and the other end of the combustion pipe 2 is a combustion end for ignition and combustion;

[0034] The combustion-supporting air inlet assembly 3 includes an air inlet pipe 31 for air inlet and two air supply pipelines for air outlet. In other embodiments, the number of air supply pipelines can also be designed as multiple according to needs. In this embodiment, the air supply pipelines include a first air supply pipeline 32 and a second air supply pipeline 33. One ends of the first air supply pipeline 32 and the second air supply pipeline 33 are successively connected and installed on the air inlet pipe 31, and the other ends are successively connected and installed on the combustion pipe 2. A first air volume regulating valve 321 is installed on the first air supply pipeline 32, and a second air volume regulating valve 331 is installed on the second air supply pipeline 33. The combustion-supporting air inlet assembly 3 is arranged close to the combustion end.

[0035] All the gas regulating valves and all the air volume regulating valves are connected to the PLC control system. The gas regulating valves and the air volume regulating valves correspond to different combustion working conditions according to different opening and closing states, and the PLC control system can control the gas regulating valves and the air volume regulating valves to achieve instantaneous transformation of different combustion working conditions.

[0036] Specifically, the first gas regulating valve 131, the second gas regulating valve 141, the first air volume regulating valve 321 and the second air volume regulating valve 331 are all connected to the PLC control system 4. In this embodiment, four working conditions are set, which are respectively:

[0037] Working condition 1: The first gas regulating valve 131 is fully open, the second gas regulating valve 141 is closed, the first air volume regulating valve 321 is fully open, and the second air volume regulating valve 331 is closed;

[0038] Working condition 2: The first gas regulating valve 131 is closed, the second gas regulating valve 141 is fully open, the first air volume regulating valve 321 is closed, and the second air volume regulating valve 331 is fully open;

[0039] Working condition 3: The first gas regulating valve 131 is half open, the second gas regulating valve 141 is half open, the first air volume regulating valve 321 is fully open, and the second air volume regulating valve 331 is closed;

[0040] Working condition 4: The first gas regulating valve 131 is half open, the second gas regulating valve 141 is half open, the first air volume regulating valve 321 is closed, and the second air volume regulating valve 331 is fully open.

[0041] According to the combustion theory, when different working conditions change instantaneously, it will cause changes in the gas concentration and air concentration inside the combustion tube 2, that is, the relative gas concentration in a certain range at the burner outlet and within the short-time diffusion range is relatively high under one or more working conditions, and there is a relatively large amount of surplus gas; under another one or more working conditions after the change, the relative air concentration in a certain range at the burner outlet and within the short-time diffusion range is relatively high, and there is a large amount of surplus air, resulting in slower combustion and lower temperature, and thus it is difficult to form NO in the high-temperature flue gas generated by the combustion reaction. X ; By alternately operating several working conditions, the surplus gas and a large amount of surplus air come into contact at high temperature, enabling the gas to burn out, and very little NOx is generated during the entire combustion process, thereby achieving the pulsed low-nitrogen combustion effect.

[0042] More preferably, the combustion tube 2 sequentially includes an air inlet section 21, a first compensation section 22, a first mixing section 23, a second compensation section 24, a second mixing section 25, and a combustion section from the gas inlet to the combustion end; the first air supply pipeline 32 is communicated with the first mixing section 23, the second air supply pipeline 33 is communicated with the second mixing section 25, and the lengths of the first compensation section 22 and the second compensation section 24 are adjustable.

[0043] Wherein, a first length adjustment device 221 and a second length adjustment device 241 are respectively installed on the first compensation section 22 and the second compensation section 24. In this embodiment, both the first length adjustment device and the second length adjustment device are bellows compensators equipped with reduction motors, and their reduction motors are both connected to the PLC control system. In actual implementation, the first compensation section 22 and the second compensation section 24 correspond to different combustion working conditions with different lengths, and the PLC control system 4 can control the length transformation of the two bellows compensators to achieve the instantaneous transformation of different combustion working conditions.

[0044] In this embodiment, corresponding to the above four working conditions, the lengths of the first compensation section 22 and the second compensation section 24 are respectively set as:

[0045] Working condition 1: Both the first compensation section 22 and the second compensation section 24 are at the original length, that is, at the 0 position;

[0046] Working condition 2: Both the first compensation section 22 and the second compensation section 24 are at the original length, that is, at the 0 position;

[0047] Working condition 3: The first compensation section 22 is lengthened by 20 cm, that is, at the +20 position, and the second compensation section 24 is at the 0 position;

[0048] Working condition 4: The first compensation section 22 is at the 0 position, and the first compensation section 22 is lengthened by 20 cm, that is, at the +20 position.

[0049] Adjust the lengths of the two bellows compensators through the first adjusting device 221 and the second adjusting device 241, so as to realize the instantaneous adjustment and transformation of the nozzle parameters of each combustion air pipeline.

[0050] In order to ensure the service life of the burner and enhance its high-temperature resistance, heat-resistant materials and castables are fixed on the outside of the combustion section through fasteners.

[0051] More preferably, the air inlet pipe 31 includes an air inlet section 311 and a bellows compensation section 312. The bellows compensation section 312 is located at one end of the air inlet section 311 away from the air inlet end. The first air supply pipeline 32 is connected and installed to the air inlet section 311, and the second air supply pipeline 33 is connected and installed to one end of the bellows compensation section 312 away from the air inlet section 311.

[0052] During actual operation, the PLC control system 4 is located in the main control room at the construction site. It is connected to each regulating valve and reduction motor, sets the adjustment parameters and motor rotation parameters under various working conditions, and through the instantaneous transformation of various working conditions, the relative concentration of gas in a certain interval at the burner outlet and within a short-time diffusion range is relatively high under one or more working conditions, and there is a relatively large amount of gas surplus; under another or more working conditions, the relative concentration of air in a certain interval at the burner outlet and within a short-time diffusion range is relatively high, there is a large amount of surplus air, the combustion becomes slower, and the temperature is lower. As a result, it is very difficult to form NO in the high-temperature flue gas generated by the combustion reaction. X ; Several working conditions operate alternately, so that the surplus gas contacts a large amount of surplus air at high temperature, enabling the gas to burn out, and very little NOx is generated during the entire combustion process, thus achieving the pulsed low-nitrogen combustion effect.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pulse-type low-nitrogen burner, characterized in that, It includes a gas feeding assembly, a combustion tube, a combustion-supporting air inlet assembly, and a PLC control system; The gas feeding assembly includes a feeding pipe for feeding, a mixing pipe for discharging, and at least two feeding pipelines connected and installed between the feeding pipe and the mixing pipe. A gas regulating valve is installed on each feeding pipeline; One end of the combustion tube has a gas inlet communicated with the discharging end of the mixing pipe, and the other end of the combustion tube is a combustion end for ignition and combustion; The combustion-supporting air inlet assembly includes an air inlet pipe for air inlet and at least two air supply pipelines for air outlet. One end of the air supply pipeline is communicated with the air inlet pipe, and the other end is communicated with the combustion tube. An air volume regulating valve is installed on each air supply pipeline. The combustion-supporting air inlet assembly is arranged close to the combustion end; All the gas regulating valves and all the air volume regulating valves are connected to the PLC control system. The gas regulating valves and the air volume regulating valves correspond to different combustion conditions according to different opening and closing states. The PLC control system can control the gas regulating valves and the air volume regulating valves to achieve instantaneous transformation of different combustion conditions; The air supply pipeline includes a first air supply pipeline and a second air supply pipeline. One ends of the first air supply pipeline and the second air supply pipeline are successively connected and installed on the air inlet pipe, and the other ends are successively connected and installed on the combustion tube; The combustion tube successively includes an air inlet section, a first compensation section, a first mixing section, a second compensation section, a second mixing section, and a combustion section from the gas inlet to the combustion end. The first air supply pipeline is communicated with the first mixing section, and the second air supply pipeline is communicated with the second mixing section. The lengths of the first compensation section and the second compensation section are adjustable; The first compensation section and the second compensation section are respectively installed with a first length adjusting device and a second length adjusting device. The first length adjusting device and the second length adjusting device are both connected to the PLC control system. The first compensation section and the second compensation section correspond to different combustion conditions according to different lengths. The PLC control system can control the first length adjusting device and the second length adjusting device to achieve instantaneous transformation of different combustion conditions.

2. The pulse-type low-nitrogen burner according to claim 1, characterized in that, The feeding pipeline includes a first feeding pipeline and a second feeding pipeline. One ends of the first feeding pipeline and the second feeding pipeline are successively connected and installed on the feeding pipe, and the other ends are successively connected and installed on the mixing pipe.

3. The pulse-type low-nitrogen burner according to claim 2, characterized in that, Different specifications of gas nozzles are respectively installed at one ends of the first feeding pipeline and the second feeding pipeline close to the mixing pipe; different specifications of gas nozzles are respectively installed at one ends of the first air supply pipeline and the second air supply pipeline close to the combustion tube.

4. The pulse-type low-nitrogen burner according to claim 3, characterized in that, The air inlet pipe includes an air inlet section and a corrugated compensation section. The corrugated compensation section is located at one end of the air inlet section far from the air inlet end. The first air supply pipeline is connected and installed on the air inlet section, and the second air supply pipeline is connected and installed with one end of the corrugated compensation section far from the air inlet section.

5. The pulse-type low-nitrogen burner according to claim 4, characterized in that, The combustion end is located at one end of the combustion section, and a heat-resistant material and a castable are fixed on the outside of the combustion section through fasteners.

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