Industrial tail gas blending combustion low-nitrogen combustor for fluidized bed boiler

Abstract

The utility model discloses an industrial tail gas blending combustion low-nitrogen combustor for a fluidized bed boiler, which belongs to the technical field of industrial combustors and comprises an outer barrel, an air inlet barrel and a gas collection tank outer barrel are fixedly mounted on the outer barrel, a gas inlet is fixedly mounted on the gas collection tank outer barrel, a plurality of groups of outer spray head pipes are fixedly mounted on the gas collection tank outer barrel, and a plurality of groups of outer spray head pipes are fixedly mounted on the outer spray head pipes. The tail ends of the multiple sets of outer spray head pipes penetrate into the outer barrel, and inclined spray heads and front spray heads are fixedly installed at the tail ends of every two adjacent sets of outer spray head pipes correspondingly. An inner spray head pipe is fixedly installed on the gas collection box outer cylinder and located on the central axis of the gas collection box outer cylinder. The industrial tail gas blending combustion low-nitrogen combustor of the fluidized bed boiler is provided with various nozzles, can be mixed with distributed air in a staged manner for combustion, can be better mixed with air, enlarges the flame range, reduces the flame center temperature, disperses flames, and is lower in temperature of the dispersed flames compared with concentrated flame temperature, high in heat transfer efficiency and not prone to generating toxic waste gas.

Description

Technical Field

[0001] This utility model belongs to the field of industrial burner technology, specifically relating to a low-NOx burner for co-firing industrial tail gas in a fluidized bed boiler. Background Technology

[0002] With the development of technology, combustion equipment is being used more and more widely. However, the high-temperature flue gas produced after combustion produces nitrogen oxides. In particular, in the desulfurization process of fluidized bed boilers, the flue gas from coal combustion contains a large amount of nitrogen oxides. Once discharged outdoors, it will cause serious air pollution. For example, when mixed with oxygen in the air and exposed to sunlight, it will form acid rain. Nitric oxide, one of the nitrogen oxides, is a carcinogen. When mixed with oxygen, it forms nitrogen dioxide, which reduces the blood's oxygen-carrying capacity and leads to lung and bronchial diseases.

[0003] Therefore, in order to address the above-mentioned technical problems, it is necessary to provide a low-NOx burner for co-firing industrial exhaust gas from a fluidized bed boiler.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a low-NOx burner for co-firing industrial exhaust gas from a fluidized bed boiler, which can effectively solve the problem of high nitrogen oxide emissions in industrial exhaust gas from fluidized bed boilers, reduce the emission of harmful gases, and play an auxiliary role in the boiler.

[0006] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0007] A low-NOx burner for co-firing industrial tail gas from a fluidized bed boiler includes an outer cylinder, on which an air inlet duct and a gas collecting box outer cylinder are fixedly installed. A gas inlet is fixedly installed on the gas collecting box outer cylinder, and multiple sets of external nozzle pipes are fixedly installed on the gas collecting box outer cylinder. The ends of the multiple sets of external nozzle pipes all penetrate into the interior of the outer cylinder, and oblique nozzles and straight nozzles are fixedly installed at the ends of adjacent sets of external nozzle pipes, respectively.

[0008] An inner nozzle pipe is fixedly installed on the outer cylinder of the gas collecting box. The inner nozzle pipe is located on the central axis of the outer cylinder of the gas collecting box. A central nozzle is fixedly installed at the end of the inner nozzle pipe. A swirl vane is rotatably installed on the inner nozzle pipe.

[0009] In one or more embodiments of this utility model, air outlet holes are provided on the angled nozzle, the straight nozzle, and the center nozzle.

[0010] The air outlets on the central nozzle are arranged in a circular array.

[0011] In one or more embodiments of this utility model, the multiple sets of external nozzle pipes are arranged in a circumferential array.

[0012] In one or more embodiments of this utility model, regulating valves are fixedly installed on multiple sets of external nozzle pipes.

[0013] In one or more embodiments of this utility model, a rear flange is fixedly installed on one side of the outer cylinder of the gas collecting box, and a transition flange is fixedly installed on the side of the outer cylinder body close to the outer cylinder of the gas collecting box.

[0014] Multiple sets of bolts and nuts are provided between the transition flange and the rear flange.

[0015] In one or more embodiments of this utility model, a gasket is fixedly installed on the rear flange.

[0016] In one or more embodiments of this utility model, an installation flange is fixedly installed on the side of the outer cylinder away from the outer cylinder of the gas collecting box.

[0017] In one or more embodiments of this utility model, an electric damper is fixedly installed on the air inlet duct.

[0018] In one or more embodiments of this utility model, a damper flange is fixedly installed on the air inlet duct.

[0019] In one or more embodiments of this utility model, a flame detector and a flame observation hole are fixedly installed on the outer cylinder of the gas collecting box.

[0020] Compared with the existing technology, the low-NOx burner for industrial tail gas co-firing of the fluidized bed boiler of this utility model has multiple nozzles and staged mixing combustion with the air distribution, which can better mix with air, increase the flame range, reduce the flame center temperature, and disperse the flame. The dispersed flame temperature is lower than that of the concentrated flame, has higher heat transfer efficiency, and is less likely to produce toxic waste gas.

[0021] By using this burner to perform secondary low-temperature combustion of industrial exhaust gas, the content of nitrogen oxides can be effectively reduced. Secondary combustion can also increase the overall temperature inside the fluidized bed boiler and reduce the overall temperature difference inside the boiler, thereby improving the efficiency of the fluidized bed boiler and reducing the content of nitrogen oxides in the flue gas of the fluidized bed to the qualified standard. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a front view of a low-NOx burner for co-firing industrial tail gas in a fluidized bed boiler according to an embodiment of the present invention.

[0024] Figure 2 This is a front cross-sectional view of a low-NOx burner for co-firing industrial tail gas in a fluidized bed boiler according to one embodiment of the present invention.

[0025] Figure 3 This invention relates to a low-NOx burner for co-firing industrial exhaust gas from a fluidized bed boiler, as described in one embodiment of the present invention. Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 This invention relates to a low-NOx burner for co-firing industrial exhaust gas from a fluidized bed boiler, as described in one embodiment of the present invention. Figure 2 Enlarged view at point B in the middle;

[0027] Figure 5 This is a top cross-sectional view of a low-NOx burner for co-firing industrial tail gas in a fluidized bed boiler according to one embodiment of the present invention.

[0028] Figure 6 This is a right view of a low-NOx burner for co-firing industrial tail gas in a fluidized bed boiler according to an embodiment of the present invention.

[0029] Figure 7 This is a left view of a low-NOx burner for co-firing industrial tail gas in a fluidized bed boiler according to one embodiment of the present invention.

[0030] Figure 8 This is a schematic diagram illustrating the use of a low-NOx burner for co-firing industrial tail gas in a fluidized bed boiler, as described in one embodiment of this utility model.

[0031] Explanation of key figure labels:

[0032] 1. Outer cylinder; 101. Transition flange; 102. Mounting flange; 2. Air inlet duct; 201. Electric damper; 202. Damper flange; 3. Outer cylinder of gas collection box; 301. Rear flange; 3011. Gas gas inlet; 4. Gas inlet; 5. External nozzle pipe; 501. Regulating valve; 502. Angled nozzle; 503. Straight nozzle; 6. Flame detector; 7. Internal nozzle pipe; 701. Center nozzle; 8. Swirl vane; 9. Bolts, nuts and fasteners; 10. Observation hole; 100. Flue gas boiler; 110. Chimney; 200. Tail gas burner; 300. Bottom burner. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0034] like Figures 1-7 As shown in the figure, a low-NOx burner for co-firing industrial tail gas in a fluidized bed boiler according to one embodiment of the present invention includes an outer cylinder 1, an air inlet duct 2 and an outer cylinder 3 of a gas collection box fixedly installed on the outer cylinder 1. The air inlet duct 2 can supply air to the burner. An air damper flange 202 is fixedly installed on the air inlet duct 2, and a blower can be connected through the air damper flange 202 to supply air to the burner.

[0035] An electric damper 201 is fixedly installed on the air inlet duct 2. The electric damper 201 is used to adjust the air volume to meet actual needs.

[0036] like Figure 4 As shown, a rear flange 301 is fixedly installed on one side of the outer cylinder 3 of the gas collecting box, and a transition flange 101 is fixedly installed on the side of the outer cylinder 1 near the outer cylinder 3 of the gas collecting box. Multiple sets of bolts and nuts 9 are provided between the transition flange 101 and the rear flange 301. The multiple sets of bolts and nuts 9 can realize the assembly and fixation between the transition flange 101 and the rear flange 301, thereby assembling the outer cylinder 3 of the gas collecting box onto one side of the outer cylinder 1.

[0037] A gasket 3011 is fixedly installed on the rear flange 301. The gasket 3011 can enhance the sealing between the transition flange 101 and the rear flange 301, prevent air leakage from the burner, and ensure the safe and stable operation of the burner.

[0038] A gas inlet 4 is fixedly installed on the outer cylinder 3 of the gas collection box. The gas inlet 4 is connected to the biogas pipeline through a flange. The biogas is used as the fuel for the burner. When the burner is applied to the fluidized bed boiler 100, it can achieve self-ignition by utilizing the high temperature environment inside the fluidized bed boiler 100 without the need for an ignition device.

[0039] like Figure 1 and Figure 2 As shown, multiple sets of external nozzle pipes 5 are fixedly installed on the outer cylinder 3 of the gas collection box, and each set of external nozzle pipes 5 is fixedly installed with a regulating valve 501 to control the amount of biogas.

[0040] like Figure 2 and Figure 3 Combination Figure 6 As shown, the multiple sets of external nozzle pipes 5 are all U-shaped, and the ends of the multiple sets of external nozzle pipes 5 all penetrate into the interior of the outer cylinder 1. The ends of two adjacent sets of external nozzle pipes 5 are respectively fixedly installed with inclined nozzles 502 and straight nozzles 503, so that biogas can be sprayed out in different directions through the inclined nozzles 502 and straight nozzles 503.

[0041] Preferred, such as Figure 7 As shown, multiple sets of external nozzles 5 are arranged in a circular array to increase the flame range and flame dispersion.

[0042] like Figure 6 As shown, an inner nozzle pipe 7 is fixedly installed on the outer cylinder 3 of the gas collection box. The inner nozzle pipe 7 is located on the central axis of the outer cylinder 3 of the gas collection box, and a central nozzle 701 is fixedly installed at the end of the inner nozzle pipe 7. Among them, the oblique nozzle 502, the straight nozzle 503 and the central nozzle 701 are all provided with air outlet holes. The air outlet holes on the central nozzle 701 are distributed in a circumferential array, so that the biogas can be sprayed out in a centrally dispersed manner.

[0043] Specifically, the nozzles of this burner differ from those of traditional burners. The nozzles of this burner are more dispersed and arranged in a circular array. They are mixed and combusted with the air in stages. The nozzles are divided into angled nozzles 502, straight nozzles 503, and a central nozzle 701, which can better mix with the air, increase the flame range, reduce the flame center temperature, and achieve low-temperature combustion.

[0044] like Figure 2 and Figure 5 As shown, a swirl vane 8 is rotatably installed on the inner nozzle pipe 7. The swirl vane 8 can pressurize and turbulent the air distribution, making the air distribution more uniform and dispersed, which is conducive to better mixing with biogas.

[0045] An installation flange 102 is fixedly installed on the side of the outer cylinder 1 away from the outer cylinder 3 of the gas collecting box, so that the burner can be easily installed on the fluidized bed boiler 100 through the installation flange 102.

[0046] like Figure 8As shown, the fluidized bed boiler 100 is equipped with a chimney 110, and a nitrogen oxide detector and a temperature detector are installed on the chimney 110.

[0047] like Figure 6 and Figure 7 As shown, a flame detector 6 and a viewing hole 10 are fixedly installed on the outer cylinder 3 of the gas collection box. With the flame detector 6 and the viewing hole 10 working together with the electric damper 201, the air intake and biogas volume can be adjusted according to the needs of the fluidized bed boiler 100 and the nitrogen oxide detection of the chimney 110.

[0048] When using, such as Figure 8 As shown, a bottom burner 300 is installed near the bottom of the fluidized bed boiler 100. The bottom burner 300 is a conventional burner used for high-temperature combustion desulfurization. A pair of exhaust gas burners 200 are installed in the upper part of the fluidized bed boiler 100. The exhaust gas burners 200 are the burners of this invention. The flue gas temperature after combustion by the bottom burners 300 is high, and there are many toxic gases such as nitrogen monoxide. Because the exhaust gas burners 200 are arranged above the fluidized bed boiler 100, only the bottom burners 300... During normal combustion, when the temperature inside the furnace reaches the threshold, the fuel for the tail gas burner 200 is biogas, which is then circulated by a blower. This allows for self-ignition, enabling the industrial tail gas inside the fluidized bed boiler 100 to be burned again at a low temperature. This effectively reduces the content of nitrogen oxides. The secondary combustion also raises the overall temperature inside the fluidized bed boiler 100, thereby reducing the overall temperature difference inside the boiler and improving the efficiency of the fluidized bed boiler 100. Furthermore, it reduces the content of nitrogen oxides in the flue gas of the fluidized bed boiler 100 to the qualified standard.

[0049] This invention can effectively solve the problem of high nitrogen oxide content in the industrial exhaust gas inside a fluidized bed boiler 100, reduce the emission of harmful gases, and play an auxiliary role in the boiler.

[0050] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A low-NOx burner for co-firing industrial tail gas from a fluidized bed boiler, characterized in that, The device includes an outer cylinder, on which an air inlet duct and an outer cylinder of a gas collection box are fixedly installed. A gas inlet is fixedly installed on the outer cylinder of the gas collection box. Multiple sets of external nozzle pipes are fixedly installed on the outer cylinder of the gas collection box. The ends of the multiple sets of external nozzle pipes all penetrate into the interior of the outer cylinder. An angled nozzle and a straight nozzle are fixedly installed at the ends of two adjacent sets of external nozzle pipes, respectively. An inner nozzle pipe is fixedly installed on the outer cylinder of the gas collecting box. The inner nozzle pipe is located on the central axis of the outer cylinder of the gas collecting box. A central nozzle is fixedly installed at the end of the inner nozzle pipe. A swirl vane is rotatably installed on the inner nozzle pipe.

2. The low-NOx burner for co-firing industrial tail gas from a fluidized bed boiler according to claim 1, characterized in that, The angled nozzle, the straight nozzle, and the center nozzle are all provided with air outlets; The air outlets on the central nozzle are arranged in a circular array.

3. A low-NOx burner for co-firing industrial tail gas from a fluidized bed boiler according to claim 1, characterized in that, The multiple sets of external nozzles are arranged in a circumferential array.

4. A low-NOx burner for co-firing industrial tail gas from a fluidized bed boiler according to claim 3, characterized in that, Each of the external nozzles is fixedly equipped with a regulating valve.

5. A low-NOx burner for co-firing industrial tail gas from a fluidized bed boiler according to claim 1, characterized in that, A rear flange is fixedly installed on one side of the outer cylinder of the gas collecting box, and a transition flange is fixedly installed on the side of the outer cylinder body close to the outer cylinder of the gas collecting box. Multiple sets of bolts and nuts are provided between the transition flange and the rear flange.

6. A low-NOx burner for co-firing industrial tail gas from a fluidized bed boiler according to claim 5, characterized in that, A gasket is fixedly installed on the rear flange.

7. A low-NOx burner for co-firing industrial tail gas from a fluidized bed boiler according to claim 5, characterized in that, A mounting flange is fixedly installed on the side of the outer cylinder away from the outer cylinder of the gas collecting box.

8. A low-NOx burner for co-firing industrial tail gas from a fluidized bed boiler according to claim 1, characterized in that, An electric damper is fixedly installed on the air inlet duct.

9. A low-NOx burner for co-firing industrial tail gas from a fluidized bed boiler according to claim 8, characterized in that, A damper flange is fixedly installed on the air inlet duct.

10. A low-NOx burner for co-firing industrial tail gas from a fluidized bed boiler according to claim 8, characterized in that, The outer cylinder of the gas collecting box is fixedly equipped with a flame detector and a flame observation hole.

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