Dry SNCR (selective non-catalytic reduction) denitration equipment
By optimizing the spray gun distribution and guide plate design in SNCR denitrification equipment, and combining it with cam-driven discharge plate movement, the problems of spray gun temperature reduction and insufficient atomization in traditional SNCR denitrification have been solved, achieving more efficient denitrification effect and equipment maintainability, and reducing operating costs.
Patent Information
- Application Number
- CN202520390617.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-03-07
AI Technical Summary
In the traditional SNCR denitrification process, the temperature of the flue gas near the spray gun decreases, affecting the denitrification reaction temperature conditions and leading to a decrease in reaction efficiency. Furthermore, insufficient atomization by the spray gun causes droplets to fall and corrode the water-cooled wall, shortening the equipment life and increasing maintenance costs.
The dry SNCR denitrification equipment uses spray guns distributed in an equiangular ring within the denitrification furnace, with more spray guns in the middle than at the top and bottom. The nozzles are tilted at different angles, and the guide plates change the flow path of the flue gas. The storage bin uses a cam to drive the discharge plate to reciprocate, ensuring uniform delivery and spraying of the reducing agent. The combination of guide plates and push plates improves reaction uniformity and maintainability.
It improves the comprehensiveness and uniformity of the denitrification reaction, increases the nitrogen oxide conversion rate by 15%-25%, reduces operating costs, ensures that the NOx emission concentration is below 50mg/Nm3, improves equipment maintainability, and has significant economic cost advantages.
Smart Images
Figure CN223800329U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of boiler flue gas treatment technology, concretely is dry process SNCR denitration equipment. BACKGROUND
[0002] Boiler flue gas refers to gaseous emissions generated in the fuel combustion process in the boiler equipment, which is complex in composition and mainly contains harmless components such as nitrogen, oxygen, carbon dioxide and water vapor, and also contains various pollutants such as sulfur dioxide, nitrogen oxides, particulate matter, carbon monoxide and some trace heavy metals and organic pollutants.
[0003] Flue gas treatment equipment refers to a series of devices and systems for purifying and treating flue gas generated by combustion equipment such as boilers to remove pollutants therein, so that it meets the emission standards or specific use requirements, and the denitration equipment removes nitrogen oxides contained in the flue gas through specific chemical reactions, physical processes or a combination of both, so that the content of nitrogen oxides in the treated flue gas meets the national or local emission standards.
[0004] The inventors found the following problems in the prior art during the implementation of the utility model: 1. In the traditional SNCR denitration process, a side-mounted double-medium high-pressure atomizing spray gun is used to atomize ammonia water or urea solution. During this liquid atomization process, the flue gas temperature near the spray gun will decrease, which not only affects the thermal environment around the spray gun and changes the physical properties of the flue gas, but also causes the temperature conditions required for the denitration reaction to be poorly guaranteed, thereby affecting the reaction efficiency of ammonia water or urea solution vaporization and decomposition, and adversely affecting the overall denitration effect; 2. Due to insufficient atomization of the spray gun, some incompletely atomized droplets will fall downward or float upward to the water-cooled wall. The chemical components in these droplets will cause corrosion and perforation of the water-cooled wall pipeline after contacting the water-cooled wall pipeline. The corrosion of the equipment not only shortens the service life of the water-cooled wall, but also increases the equipment maintenance and replacement costs. CONTENT OF THE UTILITY MODEL
[0005] The utility model discloses a dry process SNCR denitration equipment to solve the problem that the flue gas temperature near the lance is reduced in the background technology, which not only affects the thermal environment around the lance and changes the physical properties of the flue gas, but also causes the temperature condition required for the denitration reaction to be unable to be well guaranteed. To achieve the above object, the utility model provides the following technical scheme: a dry process SNCR denitration equipment, which comprises a storage bin and a denitration furnace, the storage bin and the denitration furnace are connected through a pipeline conveying system, a discharge plate is arranged between the inner walls of the storage bin, the discharge plate is slidably connected in the sliding groove corresponding to the inner wall of the storage bin through the T-shaped sliding block embedded in the inner wall of the discharge plate, a cam is rotatably connected to the bottom of the discharge plate, a lance is fixedly connected in the denitration furnace, a guide plate is fixedly connected below the lance, and a push plate is slidably connected to the inner bottom wall of the denitration furnace.
[0006] Further preferably, the storage bin is in a narrow upper and lower conical shape, the discharge plate is located in the narrow region of the storage bin, and springs are arranged in the sliding grooves corresponding to the sliding blocks of the discharge plate in the inner wall of the storage bin.
[0007] Further preferably, the cams are symmetrically distributed along the axis of the discharge plate, form a rotating structure through the servo motor arranged on the outer wall of the storage bin, and the discharge plate forms reciprocating motion through the cams and the spring surfaces of the sliding blocks, and the surface of the discharge plate is distributed with grid-shaped through holes.
[0008] Further preferably, the pipeline conveying system is composed of a main pipeline, branch pipelines and annular pipelines, the annular pipelines are fixed at equal distances along the upper, middle and lower regions of the inner wall of the denitration furnace, each annular pipeline is connected to the main pipeline through the branch pipeline arranged on the corresponding side, the main pipeline is connected to the bottom pipe opening of the storage bin through a Roots blower, the center of the bottom pipe opening of the storage bin coincides with the center of the discharge plate, and the pipe opening extends in an inclined slope shape from the edge to the center.
[0009] Further preferably, the lances are distributed in an equiangular annular shape in the denitration furnace and are integrally connected with the annular pipelines of the inner wall of the denitration furnace, the number of lances in the middle region of the denitration furnace is more than that in the upper and lower regions, the lance pipe openings in the upper and lower regions are distributed in an inclined distribution of 20°, and the lance pipe openings in the middle region are distributed in an inclined distribution of 10°.
[0010] Further preferably, the guide plates are distributed at equal distances and intervals in the form of symmetry along the center of the furnace body of the denitration furnace between the upper and lower annular pipelines, one end of the guide plate is attached to the contour of the inner wall of the denitration furnace, and the other end is in a Z shape.
[0011] Further preferably, the top of the denitration furnace is provided with an exhaust pipe, one side of the outer wall is provided with an inlet pipe, and a panel is rotationally connected to the outer wall of the denitration furnace at a position corresponding to the push plate; the panel and a slot at the connecting position of the panel and the outer wall of the denitration furnace are covered with a rubber pad; the inner bottom wall of the denitration furnace is in a slope shape; the panel is located at a lower side of an end point of the slope surface, and the push plate is located at a higher side of the end point of the slope surface; and the bottom of the push plate is provided with a sawtooth-shaped protruding structure.
[0012] Compared with the prior art, the present application has the following beneficial effects:
[0013] In the present application, the spray guns are distributed in an equiangular ring shape in the denitration furnace, and the number of the spray guns in the middle part is more than that in the upper and lower parts; the spray gun nozzles in different regions are distributed at different angles; this arrangement can make the reducing agent spray into the furnace at different angles, uniformly cover the whole hearth space, and ensure that the flue gas can fully contact with the reducing agent regardless of the position of the flue gas in the hearth, thereby improving the comprehensiveness and uniformity of the denitration reaction; meanwhile, the flow guide plate can change the flow path of the flue gas and the reducing agent, increase the residence time of the flue gas and the reducing agent in the furnace, and help the reducing agent and nitrogen oxides to fully undergo the selective non-catalytic reduction reaction, thereby improving the conversion rate of nitrogen oxides; in addition, the storage bin uses the rotation of the cam to make the discharge plate reciprocate, thereby ensuring the uniform discharge of the reducing agent, the uniform conveying of the reducing agent to the annular pipes at different heights by the pipe conveying system, and the stable denitration reaction; under the condition that the ammonia water does not participate in the denitration and no human intervention is needed, the NOX emission concentration can be stably ensured to be less than 50mg / Nm 3 In the present application, the spray guns are distributed in an equiangular ring shape in the denitration furnace, and the number of the spray guns in the middle part is more than that in the upper and lower parts; the spray gun nozzles in different regions are distributed at different angles; this arrangement can make the reducing agent spray into the furnace at different angles, uniformly cover the whole hearth space, and ensure that the flue gas can fully contact with the reducing agent regardless of the position of the flue gas in the hearth, thereby improving the comprehensiveness and uniformity of the denitration reaction; meanwhile, the flow guide plate can change the flow path of the flue gas and the reducing agent, increase the residence time of the flue gas and the reducing agent in the furnace, and help the reducing agent and nitrogen oxides to fully undergo the selective non-catalytic reduction reaction, thereby improving the conversion rate of nitrogen oxides; in addition, the storage bin uses the rotation of the cam to make the discharge plate reciprocate, thereby ensuring the uniform discharge of the reducing agent, the uniform conveying of the reducing agent to the annular pipes at different heights by the pipe conveying system, and the stable denitration reaction; under the condition that the ammonia water does not participate in the denitration and no human intervention is needed, the NOX emission concentration can be stably ensured to be less than 50mg / Nm
[0014] In the present application, the denitration furnace is provided with a panel rotationally connected to the outer wall of the denitration furnace at a position corresponding to the push plate, and the inner bottom wall is in a slope shape; the bottom of the push plate has a sawtooth-shaped protruding structure, which is convenient for cleaning the solid impurities or unreacted substances generated in the reaction in the furnace, simple and convenient to operate, improves the maintainability of the equipment, reduces the influence of the accumulation of impurities on the normal operation of the denitration furnace and the denitration effect, and is economical and cost-effective; the technology uses a solid particle reducing agent, avoids the energy consumption problem caused by the dilution of urea or liquid ammonia by water in the traditional process, and uses a 100t / h boiler as an example; the traditional process uses about 6 tons of liquid denitrification agent in 24 hours, and consumes about 1 ton of standard coal; the dry SNCR denitration is calculated to have a total daily cost of 3616.6 yuan, which is 3178.9 yuan less than the total daily cost of 6795.5 yuan of the ammonia water SNCR denitration; according to the calculation of 340 days per year, 1080520 yuan can be saved per year, which greatly reduces the operating cost and has a significant economic cost advantage. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is a front view structural schematic diagram of the present application;
[0016] Figure 2 It is the internal structure schematic view of the storage bin of the utility model;
[0017] Figure 3 It is the internal structure schematic view of the denitration furnace of the utility model;
[0018] Figure 4 It is the distribution structure schematic view of the utility model push plate;
[0019] Figure 5 It is the utility model Figure 2 The structure enlarged schematic view of A place in the middle.
[0020] In the drawing: 1, storage bin; 2, denitration furnace; 3, pipeline conveying system; 4, discharge plate; 5, cam; 6, spray gun; 7, flow guide plate; 8, push plate. Specific embodiments
[0021] The technical scheme in the embodiments of the utility model will be described clearly and completely in conjunction with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the scope of protection of the utility model.
[0022] Please refer to Figures 1 to 5 The utility model provides a technical scheme: dry process SNCR denitration equipment, including storage bin 1 and denitration furnace 2, storage bin 1 and denitration furnace 2 are connected through pipeline conveying system 3 between, the inner wall of storage bin 1 is provided with discharge plate 4, discharge plate 4 is embedded in the sliding groove correspondingly set in the inner wall of storage bin 1 through the T-shaped slider of its inner wall and is slidably connected, the bottom of discharge plate 4 is rotatably connected with cam 5, the inside of denitration furnace 2 is fixedly connected with spray gun 6, the lower portion of spray gun 6 is fixedly connected with flow guide plate 7, and push plate 8 is slidably connected to the inner bottom wall of denitration furnace 2.
[0023] In the embodiment, as Figure 1 、 Figure 2 and Figure 5As shown, the storage bin 1 is narrow and tapered from top to bottom, and the discharge plate 4 is located in the narrow area of the storage bin 1, and in the sliding groove opened in the inner wall of the storage bin 1 corresponding to the sliding block of the discharge plate 4, and both are provided with springs, one end of the spring is fixedly connected with the surface of the corresponding sliding block, and the other end of the spring is fixedly connected with the cavity wall of the sliding groove; the tapered structure of the storage bin 1 utilizes the principle of gravity, so that the reducing agent in the storage bin 1 flows and gathers naturally to the narrow area where the discharge plate 4 is located under the action of gravity, which provides favorable conditions for discharging, and the existence of the spring can make the discharge plate 4 maintain a relatively stable movement amplitude and position in each reciprocating motion, which helps to ensure that the amount of reducing agent discharged through the grid-shaped through hole of the discharge plate 4 each time is relatively consistent, thereby realizing uniform discharging of the reducing agent, providing stable supply of reducing agent for subsequent denitration reaction, and being conducive to improving the stability and reliability of denitration effect.
[0024] As shown in Figure 2 and Figure 5 , the cam 5 is distributed symmetrically along the axis of the discharge plate 4, and forms a rotating structure with the servo motor arranged on the outer wall of the storage bin 1, and the discharge plate 4 forms reciprocating motion with the cam 5 and the spring on the surface of the sliding block, and the surface of the discharge plate 4 is distributed with grid-shaped through holes; during the rotation of the cam 5, the discharge plate 4 can move up and down at a certain frequency and amplitude, thereby realizing quantitative discharging of the reducing agent and ensuring the uniformity of the reducing agent supply, which provides a basis for the stable progress of the subsequent denitration reaction.
[0025] As shown in Figure 1 and Figure 3 , the pipeline conveying system 3 is composed of a main pipeline, branch pipelines and annular pipelines, the annular pipelines are fixed at equal distances along the upper, middle and lower regions of the inner wall of the denitration furnace 2, each annular pipeline is connected with the main pipeline through the branch pipeline arranged on its corresponding side, the main pipeline is connected with the bottom pipe opening of the storage bin 1 through a Roots blower, the center of the bottom pipe opening of the storage bin 1 coincides with the center of the discharge plate 4, and the pipe opening extends in an inclined slope shape from the edge to the center; the annular pipelines are fixed at equal distances along the upper, middle and lower regions of the inner wall of the denitration furnace 2, and each annular pipeline is connected with the main pipeline through the branch pipeline, such a layout can make the reducing agent be uniformly conveyed from the storage bin 1 to the annular pipelines at different heights in the denitration furnace 2 through the main pipeline and the branch pipeline, thereby ensuring that the reducing agent can be uniformly sprayed in each region of the denitration furnace 2, realizing effective denitration treatment of the flue gas in the whole furnace, avoiding the situation that local denitration is insufficient, improving the uniformity of denitration efficiency and effect, at the same time, the center of the bottom pipe opening of the storage bin 1 coincides with the center of the discharge plate 4, and the pipe opening extends in an inclined slope shape from the edge to the center, which is conducive to the smooth falling of the reducing agent from the storage bin 1 into the main pipeline, reduces the possibility of blockage, ensures the smoothness of the conveying process, and improves the conveying efficiency.
[0026] As shown inFigure 3 As shown, the spray guns 6 are distributed in equiangular annular form in the denitration furnace 2 and are integrally connected with the annular pipes of the inner wall of the denitration furnace 2, and the number of the spray guns 6 in the middle part of the denitration furnace 2 is more than that in the upper and lower parts, and the nozzles of the spray guns 6 in the upper and lower parts are distributed at an angle of 20°, and the nozzles of the spray guns 6 in the middle part are distributed at an angle of 10°. The distribution mode of the spray guns 6 can make the reducing agent be sprayed into the furnace from different angles and uniformly cover the whole hearth space, so that the flue gas can be fully contacted with the reducing agent no matter where it is in the hearth, and the comprehensiveness and uniformity of the denitration reaction are improved. The number of the spray guns 6 in the middle part of the denitration furnace 2 is more than that in the upper and lower parts, because the middle part is usually the key area of the flue gas flow and reaction, and more spray guns 6 can provide sufficient reducing agent to meet the higher denitration requirement of the area. The upper and lower parts are relatively weak in reaction conditions, and the appropriate number of spray guns 6 can ensure a certain denitration effect, and reasonably control the cost and the amount of reducing agent. The different angles of the spray guns 6 make the angles and directions of the reducing agent sprayed into the flue gas different, and this differentiated spraying mode helps to break the flow inertia of the flue gas, promotes the mixing of the reducing agent and the flue gas, increases the contact area and contact opportunity between them, thereby accelerating the rate of the denitration reaction and improving the reaction efficiency.
[0027] In this embodiment, as shown in Figure 3 The guide plates 7 are distributed equidistantly and symmetrically along the center of the denitration furnace 2 between the upper and lower annular pipes, and one end of the guide plate 7 corresponds to the contour of the inner wall of the denitration furnace 2 and is attached, and the other end is in Z shape. The arrangement of the guide plate 7 changes the flow path of the flue gas and the reducing agent, so that the residence time of the flue gas in the furnace is increased. Longer contact time helps the selective non-catalytic reduction reaction of the reducing agent and nitrogen oxides to be more fully, improves the conversion rate of nitrogen oxides, and makes the denitration effect better. At the same time, the Z shape of the guide plate 7 can effectively guide the airflow and mixed materials under different flue gas flow and temperature conditions, and the attachment of the other side to the corresponding position of the inner wall of the denitration furnace 2 can effectively guide the airflow to flow along the specified path, avoiding the deflection or vortex phenomenon of the airflow in the furnace.
[0028] In this embodiment, as shown in Figure 1 and Figure 4As shown, the top of the denitration furnace 2 is provided with an exhaust pipe, one side of the outer wall is provided with an inlet pipe, and the outer wall of the denitration furnace 2 is rotatably connected with a panel at a position corresponding to the push plate 8. The panel and the groove at the connection between the outer wall of the denitration furnace 2 are covered with rubber pads. The inner bottom wall of the denitration furnace 2 is a slope. The panel is located at the lower side of the end point of the slope, and the push plate 8 is located at the high side of the end point of the slope. The bottom of the push plate 8 is provided with a serrated protruding structure. The panel rotatably connected with the outer wall of the denitration furnace 2 at a position corresponding to the push plate 8 provides a convenient channel for cleaning solid impurities or unreacted substances generated by the reaction in the furnace. When cleaning is needed, the panel can be rotated to open, so that the push plate 8 can push these substances out of the furnace. The operation is simple and convenient, which greatly improves the maintainability of the equipment. The slope structure of the bottom wall of the denitration furnace 2 reduces the accumulation of impurities in the furnace, ensures the normal operation of the denitration furnace 2 and the denitration effect. At the same time, the serrated protruding structure distributed on the bottom of the push plate 8 increases the friction between the push plate 8 and the impurities, so that it is more powerful when pushing the impurities, and improves the cleaning efficiency and effect.
[0029] The use method and advantages of the utility model are as follows:
[0030] For example Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, first, the flue gas is introduced from the flue gas inlet pipe on the outer wall side of the denitration furnace 2 into the furnace. At the same time, the storage bin 1 stores solid granular reducing agent, which is a denitration agent wrapped with 5% active agent and 95% urea. The cam 5 at the bottom of the discharge plate 4 is driven to rotate by the servo motor on the outer wall of the storage bin 1. Under the action of the cam 5, the discharge plate 4 reciprocates up and down against the spring force, so that the reducing agent falls into the lower area through the grid-shaped through holes on the surface of the discharge plate 4. In order to improve the accuracy of the reducing agent discharging, an electromagnetic flowmeter and a regulating valve are arranged on the connecting pipeline between the storage bin 1 and the main pipeline. The electromagnetic flowmeter uses electromagnetic induction principle to measure the flow of the reducing agent falling into the main pipeline in real time and accurately, providing accurate data support for the operator. At the same time, according to the flow data fed back by the electromagnetic flowmeter, the control system adjusts the opening of the regulating valve to accurately control the amount of reducing agent entering the main pipeline, thereby realizing accurate control of the discharging amount. In addition, pressure sensors are installed at different positions of the main pipeline to indirectly grasp the discharging condition of the reducing agent by monitoring the pressure change in the pipeline. Once the pressure fluctuates abnormally, the relevant equipment can be quickly adjusted. The falling reducing agent is pushed into the inner wall of the pipeline conveying system 3 composed of the main pipeline, branch pipeline and annular pipeline under the action of the Roots blower with a power of 37KW, and is fixed in the upper, middle and lower areas of the inner wall of the pipeline conveying system 3, so that the reducing agent is uniformly distributed in different height areas. Subsequently, the reducing agent conveyed by the annular pipeline is sprayed into the high-temperature flue gas in the furnace through the lance 6 integrally connected with the annular pipeline on the inner wall of the denitration furnace 2. The lance 6 is distributed in an equiangular annular shape in the denitration furnace 2, and the number of the middle lances 6 is more than that of the upper and lower lances 6. The nozzle of the upper and lower lances 6 is inclinedly distributed at an angle of 20°, and the nozzle of the middle lances 6 is inclinedly distributed at an angle of 10°, so as to ensure that the reducing agent is sprayed into the flue gas at a suitable angle and distance to achieve good atomization effect and uniform mixing with the flue gas. The flow guide plate 7 below the lance 6 can guide the flow direction of the flue gas to ensure that the flue gas and the reducing agent are fully contacted and mixed in the furnace. The control of the contact time of the reducing agent with nitrogen oxides in the suitable temperature window can maximize the denitration efficiency. In the suitable temperature area, the ammonia produced by the decomposition of the reducing agent reacts with nitrogen oxides to produce harmless nitrogen and water through selective non-catalytic reduction reaction, thereby completing denitration. The flue gas after the reaction is discharged from the flue gas discharge pipe at the top of the denitration furnace 2, and the solid impurities generated during the reaction move to the lower end of the slope of the denitration furnace 2 under the action of gravity. In the subsequent cleaning, the panel arranged on the outer wall of the denitration furnace 2 is opened, the circular ring arranged on the surface of the push plate 8 is pulled by the external pull rod, and the push plate 8 is used to push these substances to the slot arranged on the panel of the outer wall of the denitration furnace 2 for cleaning. The amount of the reducing agent is about 30kg / hour. In the case that ammonia water does not participate in denitration and there is no human intervention, the NOx emission concentration can be stably guaranteed to be less than 50mg / Nm 3 In addition, the hourly average value meets the standard, which is significantly superior to the original 18% ammonia water as the denitration reducing agent in economic cost.
[0031] The basic principle, main features and advantages of the present application are shown and described above. The skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.
Claims
1. Dry SNCR denitration equipment, comprising a storage bin (1) and a denitration furnace (2), characterized in that: The storage bin (1) and the denitration furnace (2) are connected through a pipeline conveying system (3), the inner wall of the storage bin (1) is provided with a discharge plate (4), the discharge plate (4) is embedded and slidably connected in the sliding groove provided in the inner wall of the storage bin (1) through the T-shaped slider provided in the inner wall, the bottom of the discharge plate (4) is rotatably connected with a cam (5), the inside of the denitration furnace (2) is fixedly connected with a spray gun (6), the lower part of the spray gun (6) is fixedly connected with a flow guide plate (7), and the inside bottom wall of the denitration furnace (2) is slidably connected with a push plate (8).
2. The dry SNCR deNOx apparatus according to claim 1, characterized by: The storage bin (1) is narrow and tapered from top to bottom, the discharge plate (4) is located in the narrow area of the storage bin (1), and the sliding groove provided in the inner wall of the storage bin (1) corresponding to the sliding block of the discharge plate (4) is provided with a spring, one end of the spring is fixedly connected with the surface of the corresponding sliding block, and the other end of the spring is fixedly connected with the cavity wall of the sliding groove.
3. The dry SNCR deNOx apparatus according to claim 1, characterized by: The cam (5) is distributed symmetrically along the axis of the discharge plate (4), and forms a rotating structure through a servo motor provided on the outer wall of the storage bin (1), and the discharge plate (4) forms a reciprocating motion through the cam (5) and the spring on the surface of the sliding block, and the surface of the discharge plate (4) is distributed with grid-shaped through holes.
4. The dry SNCR deNOx apparatus according to claim 1, characterized by: The pipeline conveying system (3) is composed of a main pipeline, a branch pipeline and an annular pipeline, the annular pipeline is fixed at equal distances along the upper, middle and lower regions of the inner wall of the denitration furnace (2), each annular pipeline is connected with the main pipeline through the branch pipeline provided on the corresponding side, the main pipeline is connected with the bottom pipe opening of the storage bin (1) through a Roots blower, the center of the bottom pipe opening of the storage bin (1) coincides with the center of the discharge plate (4), and the pipe opening extends in an inclined slope shape from the edge to the center.
5. The dry SNCR deNOx apparatus according to claim 1, characterized by: The spray guns (6) are distributed in an equiangular annular shape in the denitration furnace (2) and are integrally connected with the annular pipeline of the inner wall of the denitration furnace (2), the number of the spray guns (6) in the middle part of the denitration furnace (2) is more than that in the upper and lower regions, the pipe openings of the spray guns (6) in the upper and lower regions are distributed at an inclination of 20°, and the pipe openings of the spray guns (6) in the middle region are distributed at an inclination of 10°.
6. The dry SNCR deNOx apparatus according to claim 1, characterized by: The flow guide plates (7) are distributed at equal distances and intervals in the form of symmetry along the center of the furnace body of the denitration furnace (2) between the upper and lower annular pipelines, one end of the flow guide plate (7) is fitted with the contour of the inner wall of the denitration furnace (2), and the other end is in a Z shape.
7. The dry SNCR deNOx apparatus according to claim 1, characterized by: A smoke exhaust pipe is arranged on the top of the denitration furnace (2), a smoke inlet pipe is arranged on one side of the outer wall of the denitration furnace (2), a panel is rotatably connected to the outer wall of the denitration furnace (2) at a position corresponding to the push plate (8), the panel and the groove opening at the connection between the outer wall of the denitration furnace (2) are covered with rubber pads, the inner bottom wall of the denitration furnace (2) is in a slope shape, the panel is located on the lower side of the end point of the slope, the push plate (8) is located on the high side of the end point of the slope, and the bottom of the push plate (8) is provided with a sawtooth-shaped protruding structure.