Ammonia burner and boiler

Abstract

The invention provides an ammonia burner and a boiler, the ammonia burner comprises an ammonia spraying device and an ammonia adjusting device, the ammonia spraying device is provided with an ammonia nozzle used for spraying ammonia, ammonia can be sprayed into a boiler hearth through the ammonia nozzle, the ammonia adjusting device is provided with an ammonia connector corresponding to the ammonia nozzle, and the ammonia nozzle is provided with an air inlet corresponding to the ammonia connector. The ammonia gas connector can be communicated with or disconnected from at least part of the ammonia gas nozzles, so that the spraying position and the spraying amount of the ammonia gas in the boiler hearth are adjusted. Compared with the prior art, a user can accurately control the injection position and the injection amount of the ammonia gas in the boiler hearth by adjusting the ammonia gas adjusting device, so that the ammonia combustion efficiency is effectively improved, the generation of nitrogen oxides is reduced to the greatest extent, and the environment and the personal health are protected.

Description

Technical Field

[0001] The invention belongs to the technical field of boilers, and in particular relates to an ammonia burner and a boiler. Background Art

[0002] With the continuous acceleration of the global industrialization process, the sharp increase in energy consumption and the increasingly serious environmental pollution problem, in order to meet this challenge, it is necessary to explore and utilize more clean energy and reduce the emission of greenhouse gases such as carbon dioxide.

[0003] As a possible new energy source, ammonia fuel has become the focus of attention for its advantages and disadvantages. The main products of ammonia fuel combustion are water and nitrogen, and there is no carbon dioxide emission, so it is significantly friendly to the environment. However, ammonia fuel also has some inherent problems, such as slow combustion speed, low combustion temperature, and narrow flammable limit range. More importantly, when the ammonia fuel combustion process is not properly controlled, a certain amount of nitrogen oxides (NOx) will be produced, causing environmental pollution and harming human health.

[0004] Therefore, how to overcome the above technical defects is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of this, the object of the present invention is to provide an ammonia burner that can effectively improve the combustion efficiency of ammonia, minimize the generation of nitrogen oxides, and protect the environment and human health.

[0006] Another object of the present invention is to provide a boiler.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] An ammonia burner, comprising:

[0009] an ammonia gas ejection device, wherein the ammonia gas ejection device is provided with an ammonia gas nozzle for ejecting ammonia gas, and the ammonia gas can be ejected into the furnace of the boiler through the ammonia gas nozzle;

[0010] An ammonia regulating device is provided with an ammonia interface corresponding to the ammonia nozzle, and the ammonia interface can be connected or disconnected with at least part of the ammonia nozzle to achieve the regulation of the injection position and injection amount of the ammonia in the boiler furnace.

[0011] Optionally, the ammonia gas ejection device is a suspension pipe, one end of which is a closed end, and the other end is suspended on the top of the boiler furnace, and the ammonia gas nozzle is opened on the side wall of the suspension pipe;

[0012] The ammonia regulating device is a regulating tube, one end of which is a closed end sleeved inside the suspension tube, and the other end is an ammonia inlet end extending out of the boiler furnace. The ammonia interface is opened on the side wall of the regulating tube, and the regulating tube can move in the vertical direction inside the suspension tube.

[0013] Optionally, the suspension pipe is sealed and connected to the center of the boiler furnace roof and extends downward to the reduction area of ​​the boiler furnace.

[0014] Optionally, a cooling circulation pipeline is further provided in the suspension pipe, and the cooling circulation pipeline can wrap the ammonia nozzle;

[0015] The cooling circulation pipeline includes a water inlet pipe, a water outlet pipe, a cooling water inlet and a cooling water outlet. The cooling water inlet is connected to the water inlet pipe, the cooling water outlet is connected to the water outlet pipe, and the cooling water inlet and the cooling water outlet are interconnected.

[0016] Optionally, a swirl blade is further provided in the ammonia nozzle.

[0017] Optionally, the ammonia nozzles are in multiple groups, each group of the ammonia nozzles includes at least one layer, and each layer has at least two ammonia nozzles.

[0018] Optionally, each group of ammonia nozzles is arranged sequentially from the top to the bottom of the boiler furnace, there is a preset distance between any two adjacent groups of ammonia nozzles, and the number of layers of each group increases or decreases sequentially.

[0019] Optionally, there are 3-6 ammonia nozzles in each layer, and they are evenly distributed along the circumference of the suspension pipe, and / or,

[0020] The inner diameter of the ammonia nozzle is equal to the inner diameter of the ammonia interface.

[0021] Optionally, a rack is also provided on the adjusting tube, and a gear and a driving member are provided on the top of the boiler. The driving member is connected to the gear, and the rack is meshed with the gear. The driving member can drive the gear to drive the rack to move in the vertical direction, so as to realize the movement of the adjusting tube in the vertical direction.

[0022] A boiler comprises the ammonia burner as described in any one of the above.

[0023] Compared with the prior art, ammonia enters the ammonia regulating device and the ammonia ejecting device in sequence, and is then ejected from the ammonia nozzle of the ammonia ejecting device into the boiler furnace. By adjusting the ammonia regulating device, the ammonia interface of the ammonia regulating device is connected or disconnected with at least part of the ammonia nozzle, thereby realizing the adjustment of the injection position and injection amount of ammonia in the boiler furnace.

[0024] Compared with the prior art, the ammonia burner disclosed in the embodiment of the present invention allows the user to accurately control the injection position and injection amount of ammonia in the boiler furnace by adjusting the ammonia regulating device, thereby effectively improving the ammonia combustion efficiency, minimizing the generation of nitrogen oxides, and protecting the environment and human health. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of an ammonia burner disclosed in an embodiment of the present invention;

[0027] Figure 2 for Figure 1 Cross-sectional view along AA direction;

[0028] Figure 3 This is a schematic diagram of the internal structure of the ammonia nozzle disclosed in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the ammonia nozzles disclosed in the embodiment of the present invention in a fully opened state;

[0030] Figure 5 It is a structural schematic diagram of the partially opened state of the ammonia nozzle disclosed in an embodiment of the present invention;

[0031] Figure 6 It is a structural schematic diagram of the circulation flow direction of the cooling circulation pipeline disclosed in an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the installation structure of the ammonia burner disclosed in an embodiment of the present invention in a boiler.

[0033] Description of reference numerals:

[0034] 100, ammonia gas ejection device; 101, ammonia gas nozzle; 1011, swirl blade; 200, ammonia gas regulating device; 201, ammonia gas inlet end; 202, ammonia gas interface; 203, rack; 300, cooling circulation pipeline; 301, cooling water inlet; 302, cooling water outlet; 400, driving member; 500, gear. DETAILED DESCRIPTION

[0035] In view of this, the core of the present invention is to provide an ammonia burner that can effectively improve the combustion efficiency of ammonia, minimize the generation of nitrogen oxides, and protect the environment and human health.

[0036] Another core of the present invention is to provide a boiler.

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Please refer to Figures 1 to 7 .

[0038] Please refer to Figure 1 The ammonia burner disclosed in the embodiment of the present invention includes an ammonia gas ejection device 100 and an ammonia gas regulating device 200, wherein the ammonia gas ejection device 100 is provided with an ammonia gas nozzle 101 for ejecting ammonia gas, and ammonia gas can be sprayed into the boiler furnace through the ammonia gas nozzle 101, and the ammonia gas regulating device 200 is provided with an ammonia gas interface 202 corresponding to the ammonia gas nozzle 101, and the ammonia gas interface 202 can be connected or disconnected with at least part of the ammonia gas nozzle 101 to achieve the adjustment of the injection position and injection amount of ammonia gas in the boiler furnace.

[0039] Ammonia gas sequentially enters the ammonia regulating device 200 and the ammonia ejecting device 100, and is then ejected from the ammonia nozzle 101 of the ammonia ejecting device 100 into the boiler furnace. By adjusting the ammonia regulating device 200, the ammonia interface 202 of the ammonia regulating device 200 is connected or disconnected with at least part of the ammonia nozzle 101, thereby realizing the adjustment of the injection position and injection amount of ammonia gas in the boiler furnace.

[0040] Compared with the prior art, the ammonia burner disclosed in the embodiment of the present invention allows the user to accurately control the injection position and injection amount of ammonia in the boiler furnace by adjusting the ammonia regulating device 200, thereby effectively improving the ammonia combustion efficiency, minimizing the generation of nitrogen oxides, and protecting the environment and human health.

[0041] The embodiment of the present invention does not limit the specific structure of the ammonia spraying device 100 and the ammonia regulating device 200. As long as the structure meets the use requirements of the present invention, it is within the protection scope of the present invention.

[0042] As one embodiment, the ammonia spraying device 100 disclosed in the embodiment of the present invention is a suspension pipe, wherein one end of the suspension pipe is a closed end, and the other end is suspended at the top of the boiler furnace, and the ammonia nozzle 101 is opened on the side wall of the suspension pipe.

[0043] The ammonia regulating device 200 is a regulating pipe, one end of which is a closed end sleeved inside the suspension pipe, and the other end is an ammonia inlet end 201 extending out of the boiler furnace. The ammonia interface 202 is opened on the side wall of the regulating pipe, and the regulating pipe can move in the vertical direction inside the suspension pipe.

[0044] Ammonia enters from the ammonia inlet end 201 and is sprayed into the boiler furnace through the ammonia interface 202 and the ammonia nozzle 101. The operator can operate the adjusting pipe to move it along the vertical direction of the suspension pipe, so that the ammonia nozzle 101 is connected or disconnected with at least part of the ammonia interface 202, so as to adjust the injection position and injection amount of ammonia into the boiler furnace.

[0045] The embodiment of the present invention does not limit the position where the suspension pipe is suspended in the boiler furnace. The suspension pipe can be suspended at any position in the boiler furnace, and those skilled in the art can make a selection according to different working conditions and scene requirements.

[0046] In the embodiment provided by the present invention, the suspension pipe is preferably sealed and connected to the center of the boiler furnace roof, and extends downward to the reduction area of ​​the boiler furnace. Compared with the traditional ammonia-mixed combustion method, ammonia can be directly sent to the reduction area of ​​the boiler furnace for combustion, which is not only conducive to increasing the propagation speed of the ammonia combustion flame, enhancing the ammonia combustion intensity, and inhibiting the generation of nitrogen oxides, but also the water vapor generated by the combustion of ammonia can cool the furnace flame, further ensuring that the suspension pipe will not overheat.

[0047] In addition, by sealing and connecting the suspension pipe to the center of the boiler furnace top, the ejected ammonia gas can be evenly distributed in the boiler furnace, thereby further improving the combustion efficiency and the mixed combustion effect.

[0048] As a further example, please combine Figure 6 It is understood that the suspension pipe disclosed in the embodiment of the present invention is also provided with a cooling circulation pipeline 300, wherein the cooling circulation pipeline 300 can wrap the ammonia nozzle 101. Such a configuration can effectively prevent the ammonia nozzle 101 from being deformed by heat and the problem of premature combustion of ammonia, thereby ensuring the normal operation of the ammonia burner.

[0049] It should be noted that the cooling circulation pipeline 300 includes a water inlet pipe, a water outlet pipe, a cooling water inlet 301 and a cooling water outlet 302. The cooling water inlet 301 is connected to the water inlet pipe, the cooling water outlet 302 is connected to the water outlet pipe, and the cooling water inlet 301 and the cooling water outlet 302 are connected.

[0050] The cooling water enters from the cooling water inlet 301, flows through the water inlet pipe and the water outlet pipe in sequence and then heats up. The heated cooling water flows out from the cooling water outlet 302. The heated cooling water flows out and then cools down again and enters the water inlet pipe from the cooling water inlet 301, thus realizing the circulation of cooling water.

[0051] The cooling water circulation pipeline may be provided with one layer or more than two layers, which is not specifically limited in the embodiment of the present invention. The cooling water circulation pipeline disclosed in the embodiment of the present invention is preferably a two-layer nested pipeline.

[0052] As a further example, Figure 3 As shown, the ammonia nozzle 101 disclosed in the embodiment of the present invention is further provided with a swirl blade 1011, wherein the swirl blade 1011 can make the ammonia gas rotate on one side and diffuse forward on the other side after being ejected, thereby enhancing the disturbance and promoting the mixed combustion of ammonia fuel, air and unburned coal powder. In addition, it can also increase the contact area between fuel and air, which is beneficial to enhance combustion and organize flames.

[0053] The embodiment of the present invention does not limit the structure of the swirl blades 1011 and their arrangement in the ammonia nozzle 101. Those skilled in the art can adjust the shape, angle and arrangement of the swirl blades 1011 to achieve a better swirl effect, thereby improving the mixing effect of ammonia with air and unburned coal powder.

[0054] The embodiment of the present invention does not limit the specific configuration of the ammonia nozzle 101. As long as the configuration meets the use requirements of the present invention, it is within the protection scope of the present invention.

[0055] As one embodiment, the ammonia nozzles 101 disclosed in the embodiment of the present invention are multiple groups, each group of ammonia nozzles 101 includes at least one layer, and each layer of ammonia nozzles 101 has at least two. In this way, the number of layers of ammonia nozzles 101 and the number of each layer can be adjusted as needed to achieve accurate adjustment of the ammonia injection amount.

[0056] As a further embodiment, the groups of ammonia nozzles 101 disclosed in the embodiment of the present invention are arranged sequentially from the top to the bottom of the suspension pipe, and the number of layers of each group increases or decreases sequentially. There are 3-6 ammonia nozzles 101 in each layer, and they are evenly distributed along the circumference of the suspension pipe.

[0057] As one embodiment, the number of layers of each group of ammonia nozzles 101 disclosed in the embodiment of the present invention increases from the top to the bottom of the suspension pipe. For details, please refer to Figure 1-Figure 4 The ammonia nozzles 101 disclosed in the embodiment of the present invention are arranged in three groups, wherein the first group is one layer, arranged at the top position of the suspension pipe, the second group is two layers, arranged at the middle position of the suspension pipe, and the third group is three layers, arranged at the bottom position of the suspension pipe.

[0058] There are four ammonia nozzles 101 in each layer, and the angle between the four ammonia nozzles 101 is 90°. Such an arrangement can make the distribution and combustion of ammonia more uniform, further improve the combustion efficiency and reduce NOx emissions.

[0059] As another embodiment of the present invention, the number of layers of each group of ammonia nozzles 101 disclosed in the embodiment of the present invention decreases successively from the top to the bottom of the suspension pipe, wherein three groups of ammonia nozzles 101 are arranged, the first group has three layers, arranged at the top position of the suspension pipe, the second group has two layers, arranged at the middle position of the suspension pipe, and the third group has one layer, arranged at the bottom position of the suspension pipe.

[0060] It should be noted that the distance between any two adjacent groups of ammonia nozzles may be the same or different.

[0061] As a third embodiment of the present invention, the number of layers of each group of ammonia nozzles 101 disclosed in the embodiment of the present invention from the top to the bottom of the suspension pipe may also be irregularly arranged. For example, ammonia nozzles 101 are arranged in three groups, the first group has one layer, which is arranged at the top position of the suspension pipe, the third group has one layer, which is arranged at the bottom position of the suspension pipe, and the second group has at least two layers, which are arranged in the middle position of the suspension pipe.

[0062] It is worth noting that the number of layers of ammonia nozzles 101 arranged on the suspension pipe and the number of each layer can be set by technical personnel in this field according to the actual situation and needs on site, in order to achieve better combustion effect and lower pollutant emissions.

[0063] In order to accurately adjust the ammonia injection amount, the inner diameter of the ammonia nozzle 101 disclosed in the embodiment of the present invention is preferably equal to the inner diameter of the ammonia interface 202 .

[0064] The position adjustment of the adjustment tube in the embodiment of the present invention can be performed manually by an operator or automatically.

[0065] In order to improve the adjustment efficiency and accuracy, the embodiment of the present invention preferably adopts an automatic adjustment method.

[0066] As one example, please combine Figure 7 It is understood that the regulating tube disclosed in the embodiment of the present invention is also provided with a rack 203, wherein a gear 500 and a driving member 400 are provided on the top of the boiler, the driving member 400 is connected to the gear 500, the rack 203 is meshed with the gear 500, and the driving member 400 can drive the rack 203 to move in the vertical direction by driving the gear 500 to realize the vertical movement of the regulating tube. This automated control method can adjust the ammonia injection position and flow rate according to the real-time monitored combustion parameters and environmental conditions to achieve higher combustion efficiency and lower pollutant emissions.

[0067] As another embodiment, the adjustment tube disclosed in the embodiment of the present invention can also use the structure of the screw rod and nut for position adjustment. Specifically, the driving member 400 is connected to the screw rod, the driving member 400 drives the screw rod to rotate, the nut is sleeved on the screw rod, and the adjustment tube is welded to one side of the nut. When the screw rod rotates, the screw eye is driven to move vertically along the length direction of the screw rod, thereby driving the adjustment tube to move in the vertical direction.

[0068] Of course, the position of the adjusting tube can also be adjusted by hoisting or other forms. Those skilled in the art can choose according to the actual situation. As long as the method can achieve the up and down movement of the adjusting tube, it is within the protection scope of the present invention.

[0069] The operator can control the injection position and injection amount of ammonia in the boiler furnace by adjusting the vertical position of the regulating tube. Figure 4 To understand, Figure 4 This is a state where the ammonia nozzle 101 and the ammonia interface 202 are connected in a one-to-one correspondence, and the maximum injection amount of ammonia can be achieved in this state.

[0070] Please combine Figure 5 To understand, Figure 5 Part of the ammonia interface 202 is in contact with the side wall of the suspension pipe to block the ammonia interface 202, and part of the ammonia interface 202 is connected to the ammonia nozzle 101. In this state, the operator can obtain the required ammonia injection amount and injection position, thereby gradually reducing the ammonia flow rate and achieving the purpose of reducing the ammonia blending ratio.

[0071] The embodiment of the present invention does not limit the specific structure of the driving member 400. As long as the structure meets the use requirements of the present invention, it is within the protection scope of the present invention.

[0072] As one embodiment, the driving member disclosed in the embodiment of the present invention may be a motor, a cylinder, or other structures. Those skilled in the art may select the driving member according to actual needs.

[0073] The embodiment of the present invention does not limit the specific length of the suspension pipe. As a specific embodiment of the present invention, the length of the suspension pipe disclosed in the embodiment of the present invention is preferably that the top of the suspension pipe is connected to the top of the boiler furnace, and the bottom of the suspension pipe is aligned with the lowest pulverized coal burner of the boiler.

[0074] Among them, the diameter of the ammonia inlet end 201 is preferably 3100mm-4500mm, the inner diameter of the ammonia nozzle 101 is preferably 330mm-560mm, and the inner diameter of the regulating tube is preferably 2000mm-3400mm.

[0075] It should be explained that in the implementation of the present invention Figure 4and Figure 5 B represents the flow direction of ammonia after the ammonia enters the ammonia regulating device 200 from the ammonia inlet end 201 , and C represents the flow direction of ammonia after being diverted by the ammonia nozzle 101 .

[0076] An embodiment of the present invention further discloses a boiler, comprising the ammonia burner disclosed in any one of the above embodiments.

[0077] Since the boiler adopts the ammonia burner disclosed in the above embodiment, the boiler has the technical advantages of the ammonia burner disclosed in the embodiment of the present invention, which will not be described in detail in the embodiment of the present invention.

[0078] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0079] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0080] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An ammonia burner, characterized in that: include: an ammonia gas ejection device, wherein the ammonia gas ejection device is provided with an ammonia gas nozzle for ejecting ammonia gas, and the ammonia gas can be ejected into the boiler furnace through the ammonia gas nozzle; An ammonia regulating device is provided with an ammonia interface corresponding to the ammonia nozzle, and the ammonia interface can be connected or disconnected with at least part of the ammonia nozzle to achieve the regulation of the injection position and injection amount of the ammonia in the boiler furnace.

2. The ammonia burner according to claim 1, characterized in that: The ammonia gas ejection device is a suspension pipe, one end of which is a closed end, and the other end is suspended on the top of the boiler furnace, and the ammonia gas nozzle is opened on the side wall of the suspension pipe; The ammonia regulating device is a regulating tube, one end of which is a closed end sleeved inside the suspension tube, and the other end is an ammonia inlet end extending out of the boiler furnace. The ammonia interface is opened on the side wall of the regulating tube, and the regulating tube can move in the vertical direction inside the suspension tube.

3. The ammonia burner according to claim 2, characterized in that: The suspension pipe is sealed and connected to the center of the furnace top of the boiler furnace, and extends downward to the reduction area of ​​the boiler furnace.

4. The ammonia burner according to claim 2, characterized in that: A cooling circulation pipeline is also arranged in the suspension pipe, and the cooling circulation pipeline can wrap the ammonia nozzle; The cooling circulation pipeline includes a water inlet pipe, a water outlet pipe, a cooling water inlet and a cooling water outlet. The cooling water inlet is connected to the water inlet pipe, the cooling water outlet is connected to the water outlet pipe, and the cooling water inlet and the cooling water outlet are interconnected.

5. The ammonia burner according to claim 1, characterized in that: The ammonia nozzle is also provided with a swirl blade.

6. The ammonia burner according to claim 2, characterized in that: The ammonia nozzles are in multiple groups, each group of the ammonia nozzles includes at least one layer, and each layer has at least two ammonia nozzles.

7. The ammonia burner according to claim 6, characterized in that: Each group of ammonia nozzles is arranged sequentially from the top to the bottom of the boiler furnace, there is a preset distance between any two adjacent groups of ammonia nozzles, and the number of layers of each group increases or decreases sequentially.

8. The ammonia burner according to claim 7, characterized in that: There are 3 to 6 ammonia nozzles in each layer, and they are evenly distributed along the circumference of the suspension pipe, and / or, The inner diameter of the ammonia nozzle is equal to the inner diameter of the ammonia interface.

9. The ammonia burner according to claim 2, characterized in that: A rack is also provided on the regulating tube, and a gear and a driving member are provided on the top of the boiler. The driving member is connected to the gear, and the rack is meshed with the gear. The driving member can drive the gear to drive the rack to move in the vertical direction, so as to realize the vertical movement of the regulating tube.

10. A boiler, characterized in that: Comprising the ammonia burner as described in any one of claims 1-9.

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