A submerged low-nitrogen gas combustion device

Abstract

The present invention discloses an immersion type low nitrogen gas combustion device, which comprises a device body, an upper burner, an ignition gun and a lower burner, wherein the device body is provided with an upper air inlet, a smoke outlet and a combustion space, the upper burner is arranged at the upper part of the device body, the upper burner is provided with an upper gas inlet and an upper gas nozzle, the ignition gun is arranged at the upper burner and is provided with an ignition gas inlet and a downward ignition gun outlet, the ignition gun outlet and the upper gas nozzle are arranged close to each other, the lower burner is arranged at the lower part of the device body, the lower burner is provided with a lower gas inlet pipe and an upward lower gas nozzle, and the lower gas nozzle and the ignition gun outlet are arranged toward each other. According to the present invention, the lower burner can be stably ignited, the ignition success rate is improved, the ignition success rate is as high as 100%, and the occurrence of deflagration is avoided; the combustion effect is improved, the space in the combustion chamber is maximized, and the overall combustion stability will be greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of combustion technology, and in particular to an immersed low-nitrogen gas combustion device. Background Art

[0002] The existing submerged combustion device needs to be placed in a water bath when in use, so the burner is usually set at the bottom of the device, and the ignition device used to ignite the burner is set at the top of the device to prevent the ignition device from being damaged by water. There is a large distance between the ignition device and the burner, resulting in the failure to ignite the gas ejected from the burner in time, which makes ignition difficult and the success rate is not high. Since the gas ejected from the burner is not ignited in time, the combustion chamber is filled with a large amount of mixed gas of air and gas, which will lead to the occurrence of deflagration, bringing safety hazards, incomplete combustion, and a high nitrogen oxide content in the flue gas; and the pressure pulse in the combustion chamber is large during ignition, so that the stable operation of the entire device cannot be well guaranteed. In addition, the cooling system of the combustion chamber of the existing combustion device is imperfect, resulting in a high temperature in the combustion chamber, which further increases the generation of nitrogen oxides in the flue gas and causes excessive nitrogen oxide emissions.

[0003] Therefore, a submerged low-nitrogen gas combustion device is needed to at least partially solve the above problems. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In order to at least partially solve the above problems, the present invention provides an immersed low-nitrogen gas combustion device, which comprises:

[0006] The device body is provided with an upper air inlet at the upper part, a smoke outlet at the lower part and a combustion space;

[0007] an upper burner, the upper burner being arranged at the upper part of the device body and being partially accommodated in the combustion space, the upper burner being provided with an upper gas inlet and an upper gas nozzle;

[0008] an ignition gun, the ignition gun being disposed on the upper burner and having an ignition gas inlet and a downwardly directed ignition gun outlet, the ignition gun outlet and the upper gas nozzle being arranged close to each other; and

[0009] A lower burner is arranged at the lower part of the device body and partially contained in the combustion space. The lower burner is provided with a lower gas inlet pipe and an upward lower gas nozzle. The lower gas nozzle and the ignition gun outlet are arranged facing each other.

[0010] Optionally, the device body includes an upper volute, a combustion cone and a lower volute arranged and connected from top to bottom, the upper air inlet is arranged at the upper volute, and the smoke outlet is arranged at the lower volute.

[0011] Optionally, a tapered section is provided at the upper portion of the combustion cone, and the diameter of the tapered section gradually decreases from top to bottom.

[0012] Optionally, it also includes inclined swirl blades, which are arranged at the bottom of the upper burner and below the tapered section.

[0013] Optionally, a gradually expanding section is provided at the lower portion of the combustion cone, and the diameter of the gradually expanding section gradually increases from top to bottom.

[0014] Optionally, the combustion cone is provided with a jacket and a partition plate extending vertically, wherein the partition plates are arranged in the jacket at intervals along the circumferential direction to form at least two cooling chambers, and each of the cooling chambers is provided with a cooling water inlet.

[0015] Optionally, the lower burner includes a radiation jet disk, which is arranged at the top of the lower gas inlet pipe. The radiation jet disk is provided with a plurality of radiation jet channels connected to the lower gas inlet pipe, and the plurality of radiation jet channels are radially distributed in the horizontal direction relative to the center of the radiation jet disk.

[0016] Optionally, the radiation jet disk includes an upper radiation jet plate and a lower radiation jet plate arranged at intervals up and down, and a plurality of radiation jet baffles connecting the upper radiation jet plate and the lower radiation jet plate, wherein the plurality of radiation jet baffles are arranged at intervals to form a radiation jet channel.

[0017] Optionally, it also includes an atomizing water pipeline and a plurality of atomizing nozzles connecting the atomizing water pipeline and the combustion space, and the plurality of atomizing nozzles are respectively arranged at the upper and lower parts of the device body and the top of the lower burner.

[0018] Optionally, the device body includes a lower volute, the lower volute is provided with a lower volute top wall, and at least one of the multiple atomizing nozzles is arranged on the lower volute top wall.

[0019] Optionally, the lower volute is provided with a lower volute bottom wall, and the outer wall surface of the lower volute bottom wall is an inverted cone surface.

[0020] Optionally, the upper burner is provided with an air inlet baffle ring which can move up and down, and the air inlet baffle ring is located at the upper part of the device body.

[0021] Optionally, the upper burner includes a distribution chamber and a plurality of distribution tubes connected to the distribution chamber, the plurality of distribution tubes are arranged around the ignition gun, and the lower end of each of the plurality of distribution tubes is provided with the downwardly facing upper gas nozzle and a flame stabilizing nozzle toward the outlet of the ignition gun.

[0022] According to the submerged low-nitrogen gas combustion device of the present invention, by setting an upper burner, on the one hand, the lower burner can be stably ignited, thereby improving the ignition success rate, making the ignition success rate as high as 100%, avoiding the occurrence of deflagration, and thus improving the system stability and safety of the ignition process; on the other hand, the combustion effect is improved, so that the gas in the combustion space is close to complete combustion or complete combustion, maximizing the use of the space inside the combustion chamber, and the overall combustion stability will be greatly improved, thereby reducing various pollutants, such as CO, NOx, carbon black particles, etc.

[0023] In addition, fuel grading is formed by setting the upper gas inlet, ignition gas inlet and lower gas inlet; air grading is formed by setting the upper air inlet and the lower air inlet; thereby, the local high temperature area can be limited to the greatest extent, so that the temperature in the combustion space is roughly stable within the preset temperature, thereby further improving the overall combustion stability and reducing the generation of NOx.

[0024] The setting of the gradually contracting section and the gradually expanding section of the combustion cone can regulate the airflow field, reduce turbulence, lower flow resistance, cooperate with the swirl blades to stabilize the swirl flow field, and reduce the flow dead zone after the swirl enters the lower volute, which can effectively utilize the combustion space and organize the combustion of gas.

[0025] The cooling water atomization system formed can reduce the flame temperature in the combustion area on the one hand, and slow down the reaction rate of gas combustion on the other hand, thereby further reducing the generation of NOx. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following drawings of the present invention are used to understand the present invention as part of the present invention. The embodiments of the present invention are shown in the drawings and the description thereof is used to explain the principle of the present invention.

[0027] In the attached figure:

[0028] Figure 1 It is a three-dimensional schematic diagram of the submerged low-nitrogen gas combustion device according to the present invention;

[0029] Figure 2 for Figure 1 A cross-sectional schematic diagram of a submerged low nitrogen gas combustion device shown in;

[0030] Figure 3 for Figure 1 A perspective schematic diagram of the upper burner shown in ;

[0031] Figure 4 for Figure 1 A schematic cross-sectional view of the upper burner shown in ;

[0032] Figure 5 for Figure 1 A schematic cross-sectional view of a combustion cone shown in FIG.

[0033] Figure 6 for Figure 1 A perspective schematic diagram of a portion of the lower burner shown in;

[0034] Figure 7 for Figure 6 A schematic cross-sectional view of a portion of the lower burner is shown in FIG.

[0035] Description of reference numerals:

[0036] 100: Low nitrogen gas combustion device 101: Device body

[0037] 102: Upper air inlet 103: Smoke outlet

[0038] 104: Compressed air inlet 105: Fire viewing window

[0039] 106: Lower air inlet 107: Lower air inlet pipe

[0040] 110: Upper volute 120: Combustion cone

[0041] 121: Gradually contracting section 122: Gradually expanding section

[0042] 123: Jacket 124: Partition plate

[0043] 125: Cooling water inlet 126: Cooling water outlet

[0044] 127: Cooling water supply pipe 130: Lower volute

[0045] 131: Top wall of lower volute 132: Bottom wall of lower volute

[0046] 140: Upper burner 141: Upper gas inlet

[0047] 142: Upper gas nozzle 143: Distribution chamber

[0048] 144: Distribution pipe 145: Installation cylinder

[0049] 146: Flame stabilizing nozzle 147: Air inlet baffle ring

[0050] 148: Cover plate 149: Swirl blade

[0051] 150: Ignition gun 151: Ignition gas inlet

[0052] 152: Ignition gun outlet 153: Ignition electrode

[0053] 160: Lower burner 161: Lower gas inlet pipe

[0054] 162: Lower gas nozzle 163: Jet tube

[0055] 164: Lower gas inlet 165: Lower gas supply pipe

[0056] 166: Gas outlet 170: Radiant jet disk

[0057] 171: Radiation jet channel 172: Upper radiation jet plate

[0058] 173: Lower radiation jet plate 174: Radiation jet baffle

[0059] 181: Coil 182: Lower cooling water inlet

[0060] 183: Cooling water inlet pipe 184: Lower cooling water outlet

[0061] 185: Cooling water outlet pipe 190: Atomizing water pipeline

[0062] 191: Atomizing water nozzle 192: Lower atomizing water nozzle

[0063] 193: Lower atomized water inlet pipe 194: Lower atomized water inlet

[0064] 195: Lower atomizing water supply pipe 167: Premixed air inlet DETAILED DESCRIPTION

[0065] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0066] In order to fully understand the present invention, a detailed description will be provided in the following description. Obviously, the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other embodiments.

[0067] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of the features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0068] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifications and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

[0069] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and similar expressions used in this document are for illustrative purposes only and are not limiting.

[0070] Now, exemplary embodiments according to the present invention will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the concept of these exemplary embodiments to those of ordinary skill in the art.

[0071] like Figure 1 and Figure 2 As shown, the present invention provides an immersed low-nitrogen gas combustion device 100 for providing high-temperature flue gas. For simplicity, the submerged low-nitrogen gas combustion device is referred to as the combustion device below. The combustion device 100 can be applied to a liquefied natural gas gasification system to heat the liquefied natural gas and gasify it to form gasified natural gas. When in use, at least the lower part of the combustion device 100 needs to be placed in a water bath.

[0072] The combustion device 100 can adopt an upper and lower double volute structure as a whole to form a strong swirl flow field. Specifically, the combustion device 100 is composed of a device body 101 having a combustion space and a burner arranged on the device body 101. The device body 101 may include an upper volute 110 located at the upper part, a lower volute 130 located at the lower part, and a combustion cone 120 arranged between the upper volute 110 and the lower volute 130. The device body 101 can also be provided with an upper air inlet 102 located at the upper part and a smoke outlet 103 located at the lower part, the upper air inlet 102 is arranged at the upper volute 110, specifically, the outer end of the upper volute 110, and the smoke outlet 103 is arranged at the lower volute 130, specifically, the outer end of the lower volute 130.

[0073] Air can enter the upper volute 110 from the upper air inlet 102. The combustion cone 120 and the lower volute 130 both form a combustion space, and the air and the gas undergo a combustion reaction in the combustion space to form high-temperature flue gas. With the help of the structure of the upper volute 110 and the lower volute 130, a high-speed rotating airflow is formed in the combustion device 100, so that the gas and the air can be fully and evenly mixed. At least the lower volute 130 is arranged below the water surface of the water bath.

[0074] like Figure 2 As shown, the combustion device 100 may further include an upper burner 140, an ignition gun 150 and a lower burner 160. The upper burner 140 can be arranged at the upper part of the device body 101 and partially accommodated in the combustion space. The upper burner 140 can be provided with an upper gas inlet 141 and an upper gas nozzle 142, the upper gas inlet 141 is exposed to communicate with the gas supply pipeline; the upper gas nozzle 142 is located in the combustion space, specifically in the combustion cone 120. The upper gas inlet 141 is connected to the upper gas nozzle 142 via a gas channel. The gas ejected from the upper gas nozzle 142 can be quickly mixed with the air entering from the upper air inlet 102 in the combustion space.

[0075] The ignition gun 150 can be arranged on the upper burner 140. In other words, the ignition gun 150 is arranged on the upper part of the combustion device 100, so that the ignition gun 150 and electrical components such as cables connected to the ignition gun 150 can avoid the water bath, thereby improving the safety of the device. The ignition gun 150 can be provided with an ignition gas inlet 151 and a downward ignition gun outlet 152, and the gas can enter from the ignition gas inlet 151, be ignited in the ignition gun 150, and the flame is ejected downward from the ignition gun outlet 152.

[0076] The ignition gun outlet 152 can be arranged close to the upper gas nozzle 142. Thus, the ignition gun 150 can ignite the gas ejected from the upper gas nozzle 142 to form a larger flame ejected downward. In other words, the upper burner 140 can increase the range of the flame.

[0077] The lower burner 160 can be arranged at the lower part of the device body 101 and partially accommodated in the combustion space. The lower burner 160 is provided with a lower gas inlet pipe 161 and an upwardly directed lower gas nozzle 162, and the lower gas nozzle 162 is located in the combustion space, specifically in the lower volute 130. The lower gas inlet pipe 161 is a straight pipe arranged vertically. The lower gas nozzle 162 can be arranged at the top of the lower gas inlet pipe 161.

[0078] The lower gas inlet 164 can be arranged facing each other with the ignition gun outlet 152. For example, for the illustrated embodiment, the lower gas nozzle 162 can be located directly below the ignition gun outlet 152. For example, the combustion device 100 has a center line extending vertically, the lower gas nozzle 162 is close to or located at the center line, and the ignition gun outlet 152 is also close to or located at the center line. When the ignition gun 150 ignites the upper burner 140, a longer flame with a higher spatial filling degree is generated by the upper burner 140, which completely covers the gas injection area of ​​the lower gas nozzle 162, that is, it can touch the gas injected by the lower gas nozzle 162.

[0079] In this embodiment, the upper burner 140 can stably ignite the lower burner 160, thereby improving the ignition success rate. The step-by-step ignition mode designed by the present invention has an ignition success rate of up to 100%, which greatly avoids the combustion chamber being filled with a large amount of air-gas mixture due to the failure to ignite the gas ejected from the lower burner 160 in time, thereby avoiding the occurrence of deflagration, thereby improving the system stability and safety of the ignition process.

[0080] During operation, the upper burner 140 and the lower burner 160 operate simultaneously, and the power distribution ratio of the two burners can be adjusted according to the combustion state. The ignition gun 150 can be set to be normally open according to the process requirements.

[0081] One function of the upper burner 140 in the combustion device 100 is to stably ignite the lower burner 160; another function is to work together with the lower burner 160 to improve the combustion effect. From the perspective of combustion organization, the upper burner 140 and the lower burner 160 can achieve flexible and diverse combustion organization modes of the whole machine by adjusting their respective air-fuel ratios, thereby achieving the optimal operating condition. The purpose of the optimal operating condition is to completely burn the gas in the combustion space and maximize the use of the space inside the combustion chamber. The overall combustion stability will be greatly improved, and the combustion process will be organized with low-pollutant combustion technology, thereby reducing the generation of various pollutants such as CO, NOx, and carbon black particles. Since the structure of the upper burner 140 adopts a low-nitrogen combustion structure, it can better reduce the NOx content in the flue gas. Therefore, the upper burner 140 can also be called a low-nitrogen burner.

[0082] like Figure 3 and Figure 4 As shown, the upper burner 140 may include a distribution chamber 143 and a plurality of distribution pipes 144 connected to the distribution chamber 143. The plurality of distribution pipes 144 may be arranged around the ignition gun 150, for example, the plurality of distribution pipes 144 may be arranged at intervals along the circumference of the upper burner 140, one end of each distribution pipe 144 is connected to the distribution chamber 143, and the other end (i.e., the lower end) is provided with an upper gas nozzle 142 facing downward and a flame stabilizing nozzle 146 facing the ignition gun outlet 152. The upper gas nozzle 142 may spray gas downward, and the flame stabilizing nozzle 146 may feed a portion of gas toward the ignition gun outlet 152, so that the gas sprayed from the upper burner 140 may be quickly ignited by the ignition gun 150.

[0083] The upper burner 140 may be provided with a mounting tube 145, the upper and lower parts of which are open. Air can enter the mounting tube 145 and flow downward through the mounting tube 145. The ignition gun 150 and the distribution pipe 144 extend through the mounting tube 145, and the distribution pipe 144 is connected to the mounting tube 145. The upper burner 140 may also be provided with an air inlet baffle ring 147 that can move up and down, and the air inlet baffle ring 147 is sleeved on the mounting tube 145 and can move up and down relative to the mounting tube 145. The air inlet baffle ring 147 may be located at the upper part of the device body 101, specifically in the upper volute 110. The up and down movement of the air inlet baffle ring 147 can adjust the amount of air that enters the upper burner 140 from above the air inlet baffle ring 147. The upper part of the air inlet deflector ring 147 is provided with a tapered portion that gradually shrinks from top to bottom so as to regulate the air flow field, reduce turbulence, lower flow resistance, and allow the air swirl to easily enter the air inlet deflector ring 147.

[0084] The upper burner 140 may further include a cover plate 148 for covering the top opening of the device body 101. The ignition gun 150 and the pipe section provided with the upper gas inlet 141 pass through the cover plate 148 and extend upward. The ignition gun 150 is also provided with an ignition electrode 153 and a compressed air inlet 104. The cover plate 148 may be provided with a fire viewing window 105 and another compressed air inlet 104.

[0085] The upper burner 140 may further include an inclined swirl blade 149. The swirl blade 149 may be disposed at the bottom of the upper burner 140. Specifically, the swirl blade 149 may be configured in a ring shape and assembled and connected to the mounting tube 145. The swirl blade 149 may be configured to be angle-adjustable. In other words, the swirl blade 149 may be pivotally disposed to adjust the angle of the blade inclination, thereby adjusting the rotation direction of the fluid as needed and changing the flow field.

[0086] like Figure 5As shown, the upper part of the combustion cone 120 may be provided with a tapered section 121, and the diameter of the tapered section 121 gradually decreases from top to bottom. The setting of the tapered section 121 can significantly optimize the stability of the airflow flow field. In this embodiment, the above-mentioned swirl blade 149 can be located below the tapered section 121, so that the tapered section 121 further cooperates with the swirl blade 149, and the swirl flow is successively stabilized by the stabilizing effect of the tapered section 121 and the swirl blade 149, which can better stabilize the swirl flow field. The lower part of the combustion cone 120 may be provided with a gradually expanding section 122, and the diameter of the gradually expanding section 122 gradually increases from top to bottom, so that the flow dead zone after the swirl enters the lower volute 130 can be reduced, and the combustion space can be effectively utilized to organize the combustion of the gas.

[0087] The combustion cone 120 may also be provided with a jacket 123. The jacket 123 may be provided with a cooling water inlet 125 located at the lower part of the jacket 123 and a cooling water outlet 126 located at the upper part of the jacket 123. The cooling water inlet 125 may be connected to a cooling water supply pipe 127 or a pipeline. The cooling water flowing out from the cooling water outlet 126 after heat exchange flows to a water bath. The combustion cone 120 may also be provided with a partition plate 124 extending vertically. The partition plates 124 are arranged in the jacket 123 at intervals along the circumference of the combustion cone 120 to form at least two cooling chambers. Preferably, the partition plates 124 are arranged in the jacket 123 at intervals along the circumference of the combustion cone 120 to form at least two substantially equal cooling chambers. The partition plates 124 can separate the jacket 123 into at least two cooling chambers, for example, can be separated into two, three, four, etc. cooling chambers. Each cooling cavity is provided with a cooling water inlet 125 so that cooling water can enter different cooling cavities from different positions of the combustion cone 120 to achieve uniform cooling of the combustion cone 120 sections.

[0088] Return to see Figure 2 The lower burner 160 may include an air jet 163 with an open top and a coil 181. The air jet 163 can be communicated with a lower air inlet pipe 107 having a lower air inlet 106. The air entering from the lower air inlet 106 enters the lower burner 160 via the lower air inlet pipe 107 and is ejected upward from the air jet 163. The coil 181 is disposed inside the air jet 163. The coil 181 can be communicated with a cooling water inlet pipe 183 having a lower cooling water inlet 182 and a cooling water outlet pipe 185 having a lower cooling water outlet 184. Cooling water can enter from the lower cooling water inlet 182, pass through the cooling water inlet pipe 183, the coil 181, and the cooling water outlet pipe 185, and flow out from the lower cooling water outlet 184. The lower gas inlet pipe 161 is located in the air jet 163 and can be communicated with a lower gas supply pipe 165 having a lower gas inlet 164.

[0089] The lower burner 160 may further include a radiation jet disk 170, which is disposed at the top of the lower gas inlet pipe 161. Figure 6 and Figure 7 The radiation jet disk 170 can be provided with a plurality of radiation jet channels 171 connected to the lower gas inlet pipe 161. The plurality of radiation jet channels 171 can be radially distributed in the horizontal direction relative to the center of the radiation jet disk 170 to form a radial gas flow. Therefore, the lower burner 160 can also be called a radiation burner. With the help of the jet disk, the gas flow can be radiated in the horizontal direction from the height near the middle of the lower volute 130 to the surroundings.

[0090] The radial gas flow formed is a semi-premixed gas flow in which part of the air and the gas are premixed. Specifically, the top of the lower gas inlet pipe 161 may be provided with a gas outlet 166 ( Figure 7 The gas outlet 166 can be connected to the radiation jet channel 171 so that the gas ejected from the gas outlet 166 enters the radiation jet channel 171. The radiation jet disk 170 can be provided with a premixed air inlet 167 ( Figure 7 The premixed air inlet 167 may be located above the jet cylinder 163 and the upper and lower positions correspond to each other ( Figure 2 ) to receive part of the air ejected by the jet cylinder 163. The premixed air inlet 167 can be connected to the radiation jet channel 171. Part of the air ejected by the jet cylinder 163 will be mixed with the gas ejected from the gas outlet 166 through the premixed air inlet 167 to form a premixed gas, which will then be radiated and ejected along the radiation jet channel 171 to achieve a radiant premixed combustion flame. The premixed combustion method allows the gas to be fully mixed with the air. On the one hand, it can enhance the stability of combustion, improve combustion efficiency, and make full use of the furnace space. It can also reduce the pulsating pressure of the gas combustion process, which is further beneficial to the control of pollutants.

[0091] The lower burner 160 may be disposed at the center line of the lower volute 130 so as to radiate around in the radial direction of the lower volute 130 .

[0092] After the lower gas nozzle 162 is ignited, the radial gas flow can be ignited. In other words, the linear gas flow sprayed by the lower gas nozzle 162 can ensure that the flame of the upper burner 140 can be stably transferred to the radial gas flow, so that the radial gas flow burns, thereby ensuring the stability of ignition and the continuity of the flame, and keeping the combustion state stable.

[0093] Specifically, the radiation jet disk 170 may include an upper radiation jet plate 172 and a lower radiation jet plate 173 arranged at intervals from top to bottom, and a plurality of radiation jet baffles 174 connecting the upper radiation jet plate 172 and the lower radiation jet plate 173. The plurality of radiation jet baffles 174 may be arranged at intervals, for example, at equal intervals, to form a radiation jet channel 171. The gas outlet 166 may correspond to the position of the radiation jet channel 171, for example, one-to-one. The premixed air inlet 167 may be provided at the lower radiation jet plate 173, for example, may be provided in an annular shape, that is, the premixed air inlet 167 is an annular opening, which is convenient for production and manufacturing.

[0094] The core technical feature of the lower burner 160 is a premixed radiant burner, and the structure of the lower burner 160 described in this article is only a simplified design structure. Any improvements and modifications can be made on the basis of the lower burner 160 in this article as needed, such as changing the shape of each component.

[0095] The combustion device 100 may further include an atomizing water pipeline 190 and a plurality of atomizing nozzles connecting the atomizing water pipeline 190 and the combustion space. The plurality of atomizing nozzles may be respectively disposed on the upper portion ( Figure 2 ) and lower part ( Figure 1 ) and the top of the lower burner 160 ( Figure 7 ).from Figure 1 It can be seen that in the illustrated embodiment, the atomizing water pipeline 190 includes an atomizing water trunk and a plurality of atomizing water branches connected to the atomizing water trunk. The atomizing water branches extend to each atomizing nozzle. In this embodiment, a cooling water atomizing system can be formed, by means of which, on the one hand, the flame temperature of the combustion area can be reduced, and on the other hand, the reaction rate of the gas combustion can be slowed down, thereby further reducing the generation of NOx. The atomization amount of cooling water can be adjusted according to the emission of pollutants such as NOx and the combustion effect during the actual operation.

[0096] Specifically, several of the plurality of atomizing nozzles may be disposed on the upper volute 110, for example, above the swirl blades 149, so as to spray atomized water into the swirl wind in the upper volute 110. The lower volute 130 may be provided with a lower volute top wall 131 and a lower volute bottom wall 132. At least one of the plurality of atomizing nozzles may be disposed on the lower volute top wall 131. The lower volute top wall 131 is provided with a plurality of atomizing nozzles, for example, four or more, at intervals in the circumferential direction. Thus, atomized water may be sprayed into the high temperature flame of the lower volute 130. The plurality of atomizing nozzles include a lower atomizing water nozzle 192 disposed on the lower burner 160.

[0097] The lower burner 160 may further include a lower atomizing water inlet pipe 193. A lower atomizing water nozzle 192 is disposed at the top of the lower atomizing water inlet pipe 193. Thus, atomized water may be sprayed out at the lower atomizer to reduce the flame temperature of the lower burner 160. The lower atomizing water nozzle 192 is disposed at a middle position of the plurality of lower gas nozzles 162. The lower atomizing water inlet pipe 193 may be communicated with a lower atomizing water supply pipe 195 having a lower atomizing water inlet 194 to deliver cooling water for atomization to the lower burner 160.

[0098] Optionally, the lower air inlet 106, the lower gas inlet 164, the cooling water inlet 125, the lower cooling water outlet 184 and the lower atomizing water inlet 194 may be arranged at a position higher than the lower volute 130 to facilitate the installation of pipelines.

[0099] See also Figure 2 Since the combustion device 100 is disposed in a water bath, bubbles will be generated on the high-temperature outer surface immersed in the water bath. To avoid bubble accumulation, the lower volute bottom wall 132 can be configured to be an inverted cone, and the outer wall surface of the lower volute bottom wall 132 can be an inverted cone surface. With the help of the inverted cone surface, the bubbles attached to the outer surface of the combustion device 100 can automatically move outward along the inverted cone surface in a timely manner, so that the bubbles can be discharged smoothly, preventing bubble accumulation from causing local high-temperature dry burning, and further improving the overall life of the combustion device 100.

[0100] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. The features described herein in one embodiment may be applied to another embodiment individually or in combination with other features, unless the feature is not applicable or otherwise specified in the other embodiment.

[0101] The present invention has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An immersed low-nitrogen gas combustion device, characterized in that: include: The device body is provided with an upper air inlet and a lower air inlet located at the upper part, a smoke outlet and a combustion space located at the lower part, and the device body includes an upper volute, and the upper air inlet is arranged on the upper volute; an upper burner, the upper burner being arranged at the upper part of the device body and being partially accommodated in the combustion space, the upper burner being provided with an upper gas inlet and an upper gas nozzle facing downward; An ignition gun, which is arranged on the upper burner and has an ignition gas inlet and a downward ignition gun outlet, wherein the ignition gun outlet and the upper gas nozzle are arranged close to each other; as well as A lower burner, the lower burner is arranged at the lower part of the device body and is partially contained in the combustion space, the lower burner is connected to the lower air inlet and is provided with a lower gas inlet pipe, an upward lower gas nozzle and a plurality of radiation jet channels connected to the lower gas inlet pipe, the lower gas nozzle and the ignition gun outlet are arranged facing each other, and the plurality of radiation jet channels are distributed radially.

2. The submerged low nitrogen gas combustion device according to claim 1, characterized in that: The device body comprises the upper volute, the combustion cone and the lower volute which are arranged from top to bottom and connected to each other, and the smoke outlet is provided at the lower volute.

3. The submerged low nitrogen gas combustion device according to claim 2 is characterized in that: A tapered section is provided on the upper part of the combustion cone, and the diameter of the tapered section gradually decreases from top to bottom.

4. The submerged low nitrogen gas combustion device according to claim 3 is characterized in that: It also includes inclined swirl blades, which are arranged at the bottom of the upper burner and below the tapered section.

5. The submerged low nitrogen gas combustion device according to claim 2, characterized in that: A gradually expanding section is provided at the lower part of the combustion cone, and the diameter of the gradually expanding section gradually increases from top to bottom.

6. The submerged low nitrogen gas combustion device according to claim 2, characterized in that: The combustion cone is provided with a jacket and a partition plate extending vertically, wherein the partition plates are arranged in the jacket at intervals along the circumferential direction to form at least two cooling chambers, and each of the cooling chambers is provided with a cooling water inlet.

7. The submerged low-nitrogen gas combustion device according to any one of claims 1 to 6, characterized in that: The lower burner comprises a radiation jet disk, which is arranged at the top end of the lower gas inlet pipe. The radiation jet disk is provided with the plurality of radiation jet channels, and the plurality of radiation jet channels are radially distributed in the horizontal direction relative to the center of the radiation jet disk.

8. The submerged low nitrogen gas combustion device according to claim 7, characterized in that: The radiation jet disk includes an upper radiation jet plate and a lower radiation jet plate arranged at intervals in the upper and lower directions, and a plurality of radiation jet baffles connecting the upper radiation jet plate and the lower radiation jet plate, wherein the plurality of radiation jet baffles are arranged at intervals to form a radiation jet channel.

9. The submerged low nitrogen gas combustion device according to any one of claims 1, 3 to 6, characterized in that: It also includes an atomizing water pipeline and a plurality of atomizing nozzles connecting the atomizing water pipeline and the combustion space. The plurality of atomizing nozzles are respectively arranged at the upper and lower parts of the device body and the top of the lower burner.

10. The submerged low nitrogen gas combustion device according to claim 9, characterized in that: The device body comprises a lower volute, the lower volute is provided with a lower volute top wall, and at least one of the plurality of atomizing nozzles is arranged on the lower volute top wall.

11. The submerged low nitrogen gas combustion device according to any one of claims 1, 3 to 6, characterized in that: The device body comprises a lower volute, the lower volute is provided with a lower volute bottom wall, and the outer wall surface of the lower volute bottom wall is an inverted cone surface.

12. The submerged low nitrogen gas combustion device according to any one of claims 1 to 6, characterized in that: The upper burner is provided with an air inlet baffle ring which can move up and down, and the air inlet baffle ring is located at the upper part of the device body.

13. The submerged low nitrogen gas combustion device according to any one of claims 1 to 6, characterized in that: The upper burner includes a distribution chamber and a plurality of distribution pipes connected to the distribution chamber, the plurality of distribution pipes are arranged around the ignition gun, and the lower end of each of the plurality of distribution pipes is provided with the upper gas nozzle and a flame stabilizing nozzle facing the outlet of the ignition gun.

Images