Flue gas denitration equipment of a biomass boiler

Abstract

The application discloses a flue gas denitration equipment of a biomass boiler and relates to the field of combustion product treatment. The flue gas denitration equipment comprises a mixed air duct, a nozzle array for spraying ammonia water is arranged below the mixed air duct, upward nozzles are arranged at intervals in the nozzle array, a mounting plate is arranged in the mixed air duct, a ventilation cylinder is coaxially arranged on the nozzle body, a gas guide pipe is tangentially arranged along the cross section of the ventilation cylinder, one end of the gas guide pipe is communicated with the inside of the ventilation cylinder, and the other end of the gas guide pipe is connected with a gas conveying pipeline, the ammonia water spray sprayed by the nozzle body is in an inverted cone shape, and the cross section diameter at the height of the gas guide pipe is equal to the inner diameter of the ventilation cylinder. The gas conveying pipeline and the gas guide pipe are used to form a cyclone in the ventilation cylinder, the spray originally contacting the inner wall of the ventilation cylinder spirally rises under the action of the cyclone, and the spray flows upward together with the vertical airflow through the ventilation cylinder, so that the ammonia water spray and the flue gas are fully and uniformly mixed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of combustion product treatment, in particular to a flue gas denitration equipment of a biomass boiler. BACKGROUND

[0002] Biomass boiler flue gas denitration is a key environmental protection technology for reducing nitrogen oxide emissions, and its core principle is to convert NOx into harmless nitrogen and water through physical, chemical or biological methods. x Common denitration technologies include non-catalytic reduction (SNCR) and selective catalytic reduction (SCR) methods.

[0003] In the prior art, when the selective catalytic reduction (SCR) method is used for flue gas denitration treatment of a biomass boiler, ammonia water is mixed with air, and then sprayed into the flue gas upstream of the (SCR) reactor through a nozzle array. The mixed reducing agent and flue gas undergo a chemical reaction in the (SCR) reactor under the catalytic effect of the catalyst, thereby removing nitrogen oxides in the flue gas.

[0004] A flue gas denitration device disclosed in a related Chinese patent announcement CN221801830U includes a boiler, a flue, a denitration reactor, and a chimney connected in sequence along the flue gas movement direction. The denitration reactor is provided with a catalyst fixed bed. An ammonia injection device is arranged on the flue near the inlet of the denitration reactor. The ammonia injection device includes an ammonia gas delivery pipeline and an ammonia injection port formed on the ammonia gas delivery pipeline. A plurality of auxiliary mixing units are arranged in the flue above the ammonia injection port. The auxiliary mixing units include an inclined plate, a fixed rod, a bearing, a plurality of blades, and a support rod. The support rod is horizontally arranged, one end of the support rod is connected to the inner wall of the flue, the other end of the support rod is connected to the top of the inclined plate, the bottom of the inclined plate is connected to the inner wall of the flue, one end of the fixed rod is fixedly arranged on the plate surface of the inclined plate near the central axis of the flue, the end of the fixed rod away from the inclined plate is connected to the bearing, and the outer side of the bearing is fixedly provided with the plurality of blades.

[0005] In the above related technology, the spray sprayed by the nozzle array is in an inverted cone shape, and the cross section of the inner wall of the mixing air duct is generally rectangular. In order to avoid the occurrence of a missed spraying area between adjacent nozzle bodies, the spray areas of adjacent nozzle bodies often need to have an overlapping area, which easily causes uneven spray concentration in each part of the mixing air duct. Increasing the fan blade mechanism in the mixing air duct can achieve a certain effect of disturbing the airflow, but the effect of airflow disturbance is difficult to estimate, it is not easy to achieve accurate and uniform mixing of flue gas and ammonia water spray, and there is a close coupling relationship between the flue gas temperature of the SCR denitration tower and the ammonia water speed sprayed by the ammonia water nozzle. Both of them jointly affect the denitration efficiency and ammonia escape control. When the flue gas temperature changes, after adjusting the speed of spraying ammonia water, the fan blade mechanism is more difficult to accurately achieve uniform mixing of flue gas and ammonia water spray.

[0006] The existing flue gas denitration equipment of a biomass boiler is difficult to mix ammonia water spray and flue gas accurately and uniformly. SUMMARY

[0007] Therefore, the present application aims to provide a flue gas denitration equipment of a biomass boiler to solve the technical problem that the existing flue gas denitration equipment of a biomass boiler is difficult to mix ammonia water spray and flue gas accurately and uniformly.

[0008] To achieve the above object, the present application provides the following technical solution: a flue gas denitration equipment of a biomass boiler, comprising a mixing air duct, a nozzle array for spraying ammonia water is installed below the mixing air duct, the nozzle array is provided with upward nozzle bodies at intervals, further comprising a mounting plate, the mounting plate is installed in the mixing air duct, and a ventilation cylinder is coaxially arranged corresponding to each nozzle body, further comprising a gas guide pipe, the gas guide pipe is tangentially arranged along the cross section of the ventilation cylinder, one end of the gas guide pipe is communicated with the inside of the ventilation cylinder, and the other end of the gas guide pipe is connected with a gas pipeline, the ammonia water spray sprayed by the nozzle body is in an inverted cone shape, and the cross section diameter at the height of the gas guide pipe is equal to the inner diameter of the ventilation cylinder.

[0009] By using the above technical solution, the mounting plate is arranged in the mixing air duct, the ventilation cylinder is coaxially arranged corresponding to each nozzle body on the mounting plate, a cyclone is formed in the ventilation cylinder by using the gas pipeline and the gas guide pipe and the like components, when the spray enters the ventilation cylinder, the original inverted cone shape of the spray is changed, the spray which is originally about to contact the inner wall of the ventilation cylinder is spirally raised by the cyclone, flows upward together with the vertical airflow through the ventilation cylinder, and is mixed with each other in the flowing process, thereby achieving the purpose of fully and uniformly mixing ammonia water spray and flue gas.

[0010] The present application is further provided that a mixing frame is fixedly connected above the mounting plate in the mixing air duct, the mixing frame is composed of vertical plates intersecting longitudinally and transversely, and the intersection positions of the vertical plates are directly above the nozzle bodies.

[0011] As a preferred, the mixing frame interferes with the spirally raised airflow to promote the full mixing of ammonia water spray and flue gas.

[0012] The present application is further provided that an inverted cone-shaped windbreak cone is fixedly installed directly above each nozzle body of the mixing frame, and the diameter of the top end of the windbreak cone is smaller than the radius of the horizontal cross section of the ventilation cylinder.

[0013] As a preferred, the windbreak cone pushes the airflow through the center of the ventilation cylinder to the edge, so that the airflow is further fully mixed with the spirally raised airflow.

[0014] The application is further provided with an air inlet bin fixedly installed on the mounting plate, an air supply pipeline connected to the air inlet bin towards the air duct, and two air guide pipes connected to the air duct at the same height, which are parallel to each other and opposite to each other.

[0015] Preferably, the air is blown along the tangential direction of the air duct cross section towards the inside of the air duct to form a spiral airflow in the air duct, change the original inverted cone state of the spray, and make the spray that is originally to contact the inner wall of the air duct spirally rise under the action of the cyclone and flow upwards together with the vertical airflow through the air duct and intermingle with each other in the process of flowing.

[0016] The application is further provided with an air inlet interface fixedly connected to the middle part of the air inlet bin away from the air supply pipeline, which penetrates the mixed air duct and is used for connecting a positive pressure air source.

[0017] Preferably, the air source for air supply is connected through the air inlet interface.

[0018] The application is further provided with a wind baffle obliquely installed in the air inlet bin, a gap left between the top end of the wind baffle and the inner wall of the air inlet bin, and the projection towards the air inlet interface direction being able to completely block the air inlet interface, the wind baffle being used for blocking the airflow entering the air inlet bin from directly blowing into the air supply pipeline.

[0019] Preferably, the airflow entering the air inlet bin can be uniformly dispersed to each air supply pipeline.

[0020] The application is further provided with a heating belt fixedly installed on the inner wall of the air inlet bin along the length direction of the wind baffle and used for heating the airflow entering the air inlet bin.

[0021] Preferably, the heating belt can heat the airflow to be entered into each air supply pipeline, so as to avoid the influence of cold air on the flue gas temperature.

[0022] The application is further provided with an air inlet duct connected to the bottom end of the mixed air duct, the nozzle array installed at the top end of the air inlet duct, one end of the air guide duct connected to the top end of the mixed air duct, the other end of the air guide duct connected to the top end of the catalytic reaction tower, and the air exhaust duct connected to the bottom end of the catalytic reaction tower.

[0023] Preferably, the flue gas mixed with ammonia water through the mixed air duct is guided through the air guide duct and flows into the catalytic reaction tower for reaction.

[0024] The application is further provided with the mixed air duct having a cross-sectional area greater than that of the air inlet duct and the air guide duct.

[0025] Preferably, sufficient space is left for the gas mixing in the mixed air duct.

[0026] The application is further configured that the catalytic reaction tower is installed in a tower body, the tower body is connected to a tower frame, and the tower body is provided with working platforms for placing ammonia water atomization equipment in a vertical direction.

[0027] As preferred, the staff can conveniently perform maintenance and repair work of the tower body on each layer of the working platform.

[0028] In summary, the application mainly has the following beneficial effects:

[0029] The application forms a cyclone in the ventilation cylinder by using the gas conveying pipeline and the air guide pipe and other components, changes the original inverted cone state of the spray when the spray enters the ventilation cylinder, makes the spray that is originally to contact the inner wall of the ventilation cylinder helically rise, flows upward together with the vertical airflow through the ventilation cylinder, and intermingles with each other in the flowing process, thereby achieving the purpose of fully and uniformly mixing the ammonia water spray and the flue gas.

[0030] The application further fully mixes the ammonia water spray and the flue gas by interfering with the helically rising airflow by using the longitudinal and transverse frame structure of the mixing frame, and makes the airflow continue to flow upward along the vertical direction after passing through the mixing frame, thereby further improving the mixing uniformity of the ammonia water spray and the flue gas.

[0031] The application further improves the mixing uniformity of the ammonia water spray and the flue gas by setting the inverted cone-shaped windbreak cone at the position of the mixing frame corresponding to the nozzle body and pushing the airflow passing through the center of the ventilation cylinder to the edge, thereby further fully mixing the airflow.

[0032] The application further improves the mixing uniformity of the ammonia water spray and the flue gas by setting the inverted cone-shaped windbreak cone at the position of the mixing frame corresponding to the nozzle body and pushing the airflow passing through the center of the ventilation cylinder to the edge, thereby further fully mixing the airflow. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a perspective view of the application;

[0034] Figure 2 It is a schematic view of the internal structure of the upper end of the tower body of the application;

[0035] Figure 3Figure 7 is a perspective view of the connection between the mixed air duct, the air inlet duct and the air guide duct of the present application;

[0036] Figure 4 Figure 8 is a schematic view of the air guide duct of the present application from above into the mixed air duct;

[0037] Figure 5 Figure 9 is a perspective view of the mixed air duct of the present application; Figure 4 Figure 10 is an enlarged view of A in Figure 9;

[0038] Figure 6 Figure 11 is a perspective view of the internal structure of the mixed air duct of the present application;

[0039] Figure 7 Figure 12 is a perspective view of the nozzle array, the mounting plate and the mixing frame of the present application;

[0040] Figure 8 Figure 13 is a perspective view of the mixing frame of the present application; Figure 7 Figure 14 is an enlarged view of B in Figure 13;

[0041] Figure 9 Figure 15 is a schematic view of the mounting plate and the mixing frame from the cross-sectional perspective, and the nozzle body on the nozzle array spraying the atomized ammonia water;

[0042] Figure 10 Figure 16 is a perspective view of the mounting plate of the present application; Figure 9 Figure 17 is an enlarged view of C in Figure 16;

[0043] Figure 11 Figure 18 is a perspective view of the mounting plate of the present application;

[0044] Figure 12 Figure 19 is a perspective view of the mixing frame of the present application;

[0045] Figure 13 Figure 20 is a perspective view of the internal structure of the air inlet chamber of the present application.

[0046] BRIEF DESCRIPTION OF THE DRAWINGS

[0047] 1, tower; 2, tower body; 3, mixed air duct; 4, nozzle array; 401, nozzle body; 5, mounting plate; 6, air inlet chamber; 601, air inlet interface; 602, wind baffle; 603, heating belt; 7, air conveying pipeline; 701, air guide pipe; 8, ventilation duct; 9, mixing frame; 901, wind baffle cone; 10, fixing plate; 11, air inlet duct; 12, air guide duct; 13, catalytic reaction tower; 14, air outlet duct. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0049] The following describes embodiments of the application according to the overall structure of the application.

[0050] First embodiment

[0051] A flue gas denitration equipment of a biomass boiler, please refer to Figures 1-13 , comprising a mixed air duct 3, a nozzle array 4 for spraying ammonia water is installed below the mixed air duct 3, the nozzle array 4 is provided with upward nozzle bodies 401 at intervals, specifically, the nozzle array 4 is connected with the ammonia water mixing equipment in the tower body 2, the specific spraying pressure and flow rate are related to the temperature of the flue gas, the nozzle array 4 is not improved in the application, and the specific working process and principle are not described here.

[0052] Also includes a mounting plate 5, the mounting plate 5 is installed in the mixed air duct 3, and a ventilation cylinder 8 is coaxially arranged corresponding to the nozzle body 401, the adjacent ventilation cylinders 8 are not in contact, in other unpublished embodiments, the mounting plate 5 can also be installed on the lifting platform capable of vertically adjusting the height, under the condition of good airtightness, it can adapt to more extensive flow rate of ammonia water spray sprayed by the nozzle body 401, so that the height of the ventilation cylinder 8 provided with the gas guide pipe 701 can always correspond to the inverted cone-shaped ammonia water spray.

[0053] Also includes a gas guide pipe 701, the gas guide pipe 701 is tangentially and horizontally arranged along the cross section of the ventilation cylinder 8, one end of which communicates with the inside of the ventilation cylinder 8, and the other end is connected with the gas pipeline 7, in other unpublished embodiments, the gas guide pipe 701 can also be arranged obliquely upward or obliquely downward, the gas guide pipe 701 arranged obliquely can also generate cyclone in the ventilation cylinder 8 under suitable gas flow rate in the ventilation cylinder 8, but it is preferred to be arranged tangentially and horizontally along the cross section of the ventilation cylinder 8 in the embodiment.

[0054] Specifically, the ammonia water spray sprayed by the nozzle body 401 is inverted cone-shaped, and the cross-sectional diameter at the height of the gas guide pipe 701 is equal to the inner diameter of the ventilation cylinder 8, if no cyclone is generated in the ventilation cylinder 8, part of the ammonia water spray sprayed by the nozzle body 401 will contact the inner wall of the ventilation cylinder 8 at the height of the gas guide pipe 701.

[0055] In the above embodiment, specifically, please refer to Figures 1-6 , the bottom end of the mixed air duct 3 is connected with the air inlet duct 11, the nozzle array 4 is installed at the top end of the air inlet duct 11, one end of the air guide duct 12 is connected with the top end of the mixed air duct 3, the other end of the air guide duct 12 is connected with the top end of the catalytic reaction tower 13, the bottom end of the catalytic reaction tower 13 is connected with the air outlet duct 14, the flue gas mixed with ammonia water in the mixed air duct 3 is guided by the air guide duct 12 and flows into the catalytic reaction tower 13 for reaction.

[0056] Specifically, the cross-sectional area of the mixed air duct 3 is larger than that of the air inlet duct 11 and the air guide duct 12, so as to provide sufficient space for gas mixing in the mixed air duct 3.

[0057] Further, the catalytic reaction tower 13 is installed in the tower body 2, the tower body 2 is connected to the tower 1, and the tower body 2 is spaced apart in the vertical direction and provided with a working platform for arranging ammonia water atomizing equipment, so as to facilitate the maintenance and repair work of the tower body 2 by the workers on each layer working platform.

[0058] In the above embodiment, specifically referring to Figures 9-10 、 Figure 13 , the installation plate 5 is fixedly provided with the air inlet bin 6, the air inlet bin 6 is connected with the air supply pipeline 7 towards the ventilation cylinder 8, the ventilation cylinder 8 is connected with two air guide pipes 701 at the same height, specifically, the cross section of the air guide pipe 701 in this embodiment is rectangular, the two air guide pipes 701 are parallel to each other and opposite to each other, the air guide pipe 701 is used to blow air along the tangential direction of the cross section of the ventilation cylinder 8 towards the inside of the ventilation cylinder 8, forming a spiral airflow in the area close to the inner wall of the ventilation cylinder 8, in the process of synchronous upward movement with the airflow in the ventilation cylinder 8, the original inverted cone state of the spray is changed, the spray which is about to contact the inner wall of the ventilation cylinder 8 is spirally raised by the cyclone effect, and flows upward together with the vertical airflow through the ventilation cylinder 8, and intermingles with each other in the process of flowing.

[0059] Specifically, the middle part of the air inlet bin 6 is fixedly connected with the air inlet interface 601 away from the air supply pipeline 7, the air inlet interface 601 penetrates out of the mixed air duct 3 and is used to connect the positive pressure gas source, the air inlet interface 601 is used to connect the gas source for air supply, in this embodiment, the air inlet interface 601 is connected with the air compression gas tank in the tower body 2, air is continuously pumped into the air compression gas tank, and the internal pressure is maintained relatively constant in the process of supplying air to the air inlet bin 6, and in other unpublished embodiments, the scheme of introducing air from the air inlet duct 11 and increasing pressure can be used instead of compressed air.

[0060] Second embodiment:

[0061] A flue gas denitration equipment of a biomass boiler, please refer to Figures 1-13 , on the basis of the first embodiment, which is different from the first embodiment, the mixed air duct 3 is fixedly connected with the mixing frame 9 above the installation plate 5, the mixing frame 9 is composed of vertical plates intersecting longitudinally and transversely, and the intersection positions of the vertical plates are all above the nozzle body 401, the mixing frame 9 is used to interfere with the spiral airflow, so as to promote the full mixing of ammonia water spray and flue gas.

[0062] Specifically, the rotating airflow is blocked by the vertical plates when flowing upward to the mixing frame 9, the airflow is forced to change direction and form local turbulence, thereby destroying the stability of the spiral airflow, so that the ammonia water droplets and flue gas are fully contacted and mixed in the area below the mixing frame 9, at the same time, the intersection position of the vertical plates corresponds to the spray area of the nozzle body 401, ensuring that the sprayed ammonia water can directly enter the area with the strongest vortex disturbance, further improving the mixing uniformity. In addition, the structural design of the mixing frame 9 also plays a guiding role, avoiding airflow short circuiting, making the overall mixing process more efficient and stable.

[0063] In the above embodiment, specifically referring to Figures 9-10 、 Figure 13 , the air baffle 602 is inclinedly installed in the air inlet bin 6, a gap is left between the top end of the air baffle 602 and the inner wall of the air inlet bin 6, and the projection towards the air inlet interface 601 can completely block the air inlet interface 601. The air baffle 602 is used to block the airflow entering the air inlet bin 6 from directly blowing into the gas conveying pipeline 7, so that the airflow entering the air inlet bin 6 can be uniformly dispersed to each gas conveying pipeline 7.

[0064] Specifically, the air baffle 602 arranged obliquely realizes the preliminary flow distribution of the airflow through the gap between its top end and the inner wall of the air inlet bin 6, so that the high-speed airflow from the air inlet interface 601 changes direction after hitting the air baffle 602, thereby reducing the direct impact force on the inlet of the gas conveying pipeline 7, avoiding local high air pressure causing uneven airflow distribution. At the same time, the projection of the air baffle 602 towards the air inlet interface 601 completely blocks the air inlet interface 601, preventing the airflow from short circuiting into the gas conveying pipeline 7 without buffering, further ensuring the uniformity of the airflow entering each gas conveying pipeline 7. This structural design not only improves the stability of the overall airflow distribution, but also reduces the energy loss caused by airflow turbulence in the system, making the operation of the flue gas denitrification equipment more efficient and reliable.

[0065] Further, the ends of the gas conveying pipelines 7 away from the air inlet bin 6 are connected to each other, forming a communication structure between adjacent gas conveying pipelines 7, so that the air pressure in each pipeline tends to be balanced, further ensuring the uniformity and stability of the airflow during conveying, avoiding local airflow deviation or blockage caused by air pressure difference, thereby improving the operation efficiency and reliability of the entire denitrification system. In addition, the design of the communication structure can also automatically adjust the airflow distribution in each gas conveying pipeline 7 when the system starts or the load changes, effectively alleviating the air pressure fluctuation caused by transient working conditions, thereby maintaining the overall dynamic balance of the system, further improving the denitrification efficiency and operation stability.

[0066] Third embodiment:

[0067] A flue gas denitrification equipment for a biomass boiler, please refer to Figures 1-13Based on the second embodiment, the difference from the second embodiment is that the mixing frame 9 is fixedly installed with an inverted conical wind deflector 901 directly above each corresponding nozzle body 401. The diameter of the top of the wind deflector 901 is smaller than the radius of the horizontal cross section of the ventilation duct 8. The wind deflector 901 pushes the airflow passing through the center of the ventilation duct 8 to the edge, so that it can be further fully mixed with the spiraling airflow.

[0068] Specifically, the wind deflector cone 901 uses its inverted cone structure to divert the airflow in the central area, forcing the airflow that was originally concentrated at the axis of the ventilation duct 8 to diffuse outwards, forming a cross-mixing zone with the spiraling flue gas field. This breaks the laminar flow state of the airflow and enhances the turbulence effect. At the same time, the top dimension of the wind deflector cone 901 has been optimized to avoid interfering with the spray angle of the nozzle body 401 and to ensure that the airflow can smoothly flow around to its outer area, further improving the mixing efficiency of ammonia droplets and flue gas, making the denitrification reaction more complete and uniform, effectively improving the denitrification efficiency and reducing the ammonia escape rate.

[0069] For details regarding the above embodiments, please refer to [link / reference]. Figures 9-10 , Figure 13 A heating belt 603 for heating the airflow entering the air intake chamber 6 is fixedly installed on the inner wall of the air intake chamber 6 along the length of the baffle plate 602. The heating belt 603 can heat the airflow that will enter each air supply pipeline 7, so as to avoid the flue gas temperature being affected by cold air entering the ventilation duct 8.

[0070] Specifically, by installing a heating belt 603 inside the air intake chamber 6, the airflow before entering the air supply pipeline 7 can be preheated, thereby increasing the temperature of the airflow entering the ventilation duct 8, reducing the temperature difference between it and the high-temperature flue gas, reducing energy loss during the heat exchange process, and effectively avoiding local disturbances to the flue gas temperature caused by cold air, thereby further enhancing the stability and efficiency of the denitrification reaction.

[0071] In practical operation, this invention:

[0072] When the flue gas flows into the mixing duct 3 from the air inlet duct 11, the nozzle body 401 on the nozzle array 4 sprays an inverted cone-shaped ammonia water spray upward.

[0073] The air inlet chamber 6 continuously supplies air, which is blocked by the baffle 602 from spreading to both sides along the length direction of the air inlet chamber 6 and then evenly flows into each gas conveying pipeline 7 after bypassing the baffle 602. When the gas flow in the gas conveying pipeline 7 is sprayed from the gas guide pipe 701, the upward flowing gas flow exists in the ventilation duct 8 due to the tangential flow of the sprayed gas flow along the inner wall of the ventilation duct 8, and a cyclone upwardly flowing in the ventilation duct 8 can be formed, so that the ammonia water spray originally to be sprayed on the inner wall of the ventilation duct 8 flows upwardly under the action of the cyclone, and the ammonia water spray and the flue gas can be uniformly mixed in the process of rotating upwardly in the ventilation duct 8.

[0074] When the upwardly flowing gas flow flows to the mixing frame 9, the baffle cone 901 can make the gas flow passing through the center of the ventilation duct 8 flow to the edge, so that the upwardly flowing gas flow in the center of the ventilation duct 8 is further combined with the cyclone, and the mixing frame 9 with the longitudinal and transverse frame structure can disturb the flow of the cyclone, so that the flue gas and the ammonia water spray are more fully mixed and restored to the upwardly flowing state, thereby improving the uniformity of the mixing of the ammonia water spray and the flue gas.

[0075] Although the embodiments of the present application have been shown and described, the specific embodiments are merely illustrative of the present application, and are not intended to limit the application. The specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner, and those skilled in the art can make modifications, replacements and variations of the embodiments without creative contribution after reading the specification, as long as they are within the scope of the claims of the present application.

Claims

1. A flue gas denitration apparatus for a biomass boiler, characterized by, The utility model relates to a kind of ammonia water atomization equipment, including: Mixed air duct, nozzle array for spraying ammonia water is installed below the mixed air duct, the nozzle array is spaced with upward nozzle body; Mounting plate, the mounting plate is installed in mixed air duct, and air duct is coaxially provided with corresponding nozzle body; Gas guide pipe is tangentially arranged along the section of air duct, and one end communicates with the inside of air duct, and the other end is connected to gas pipeline, the ammonia water spray of nozzle body is inverted cone, and the section diameter at the height of gas guide pipe is equal to the inner diameter of air duct, mixed frame is fixedly connected above the mounting plate in the mixed air duct, the mixed frame is composed of vertical plate that is staggered longitudinally and transversely, and the position of vertical plate intersection is all above nozzle body, inverted cone windbreak cone is fixedly installed above corresponding each nozzle body of the mixed frame, the diameter of windbreak cone top end is less than the radius of air duct horizontal section, air inlet bin is fixedly installed on the mounting plate, air inlet bin is connected with gas pipeline towards air duct, two gas guide pipes are connected at the same height on air duct, two gas guide pipes are parallel and towards each other, air inlet interface is fixedly connected in the direction of air inlet bin middle part away from gas pipeline, air inlet interface penetrates mixed air duct, and is used to connect positive pressure gas source, air baffle is obliquely installed in air inlet bin, the gap between the top end of air baffle and the inner wall of air inlet bin is left, and the projection towards air inlet interface direction can completely shield air inlet interface, air baffle is used to block the airflow entering air inlet bin directly blowing into gas pipeline, the inner wall of air inlet bin is fixedly installed along the length direction of air baffle for heating the airflow entering air inlet bin heating belt.

2. The flue gas denitration apparatus of a biomass boiler according to claim 1, characterized by: The bottom end of the mixed air duct is connected to the air inlet duct, the nozzle array is installed at the top end of the air inlet duct, one end of the air guide duct is connected to the top end of the mixed air duct, the other end of the air guide duct is connected to the top end of the catalytic reaction tower, and the bottom end of the catalytic reaction tower is connected to the air outlet duct.

3. The flue gas denitration apparatus of a biomass boiler according to claim 2, characterized by: The cross-sectional area of the mixed air duct is larger than that of the air inlet duct and the air guide duct.

4. The flue gas denitration apparatus of a biomass boiler according to claim 2, characterized by: The catalytic reaction tower is installed in the tower body, the tower body is connected to the tower frame, and the tower body is spaced in the vertical direction to provide a working platform for the ammonia water atomization equipment.

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