Dry denitration system

Abstract

The utility model relates to a dry-method denitration system. The dry-method denitration system comprises a crushing part, a drying part, a buffer bin and an ejector which are arranged in sequence, the crushing part is used for crushing a denitration agent to a preset particle size, the drying part is provided with a heating piece and is used for drying the denitration agent, and the temporary storage bin is used for storing the dried denitration agent; a discharge hole of the crushing part is communicated with the drying part and is provided with a first switch valve; a discharge hole of the drying part is communicated with the temporary storage bin and is provided with a second switch valve; a discharge port of the temporary storage bin is communicated with an ejector and is provided with a feeder, and the ejector is used for spraying a denitration agent into the hearth. The dry-method denitration system can solve the problem that in the dry-method denitration process, due to the fact that a denitration agent is affected with damp and agglomerated, the spray gun is blocked, and the denitration reaction is affected, the denitration reaction efficiency is guaranteed, the utilization rate of the denitration agent is increased, and the denitration reaction effect is improved.

Description

Technical Field

[0001] The present application relates to the technical field of dry denitration, and in particular to a dry denitration system. Background Art

[0002] Dry denitrification refers to the process in which the chemical bonds between the amino groups of the denitrification agent and the polymer are instantly broken under high temperature conditions, generating a large number of free radicals containing ammonia, which are mixed with NO in the flue gas under the flow of flue gas in the furnace. x The reaction generates N2 for emission, making the final flue gas contain NO x The emission concentration meets the relevant standards and achieves the denitrification effect.

[0003] In the dry denitration process, the denitration agent is stored in the silo, fed to the main pipeline by a screw feeder, and then sent to the ejector by the conveying system, and finally sprayed into the furnace for denitration reaction. However, the denitration agent generally has the problem of easy agglomeration due to moisture absorption, which causes the ejector to be blocked and affects the denitration reaction, and also affects the utilization rate of the denitration agent and the effect of the denitration reaction.

[0004] Therefore, how to solve the problem of denitrification agent agglomerating due to moisture in the dry denitrification process, which causes the spray gun to be blocked and affects the denitrification reaction, ensure the efficiency of the denitrification reaction, and improve the utilization rate of the denitrification agent and the denitrification reaction effect, is a technical problem that needs to be urgently solved by technical personnel in this field. Utility Model Content

[0005] The purpose of the present application is to provide a dry denitrification system, which can solve the problem in the dry denitrification process that the denitrification agent becomes damp and agglomerated, causing the spray gun to be blocked, thereby affecting the denitrification reaction, thereby ensuring the efficiency of the denitrification reaction, and improving the utilization rate of the denitrification agent and the effect of the denitrification reaction.

[0006] In order to solve the above-mentioned technical problems, the present application provides a dry denitrification system, comprising a crushing section, a drying section, a buffer bin and an injector which are arranged in sequence; the crushing section is used to crush the denitrification agent to a preset particle size, the drying section is provided with a heating element and is used to dry the denitrification agent, and the buffer bin is used to store the dried denitrification agent; the discharge port of the crushing section is connected to the drying section and is provided with a first switch valve; the discharge port of the drying section is connected to the buffer bin and is provided with a second switch valve; the discharge port of the buffer bin is connected to the injector and is provided with a feeder, and the injector is used to spray the denitrification agent into the furnace.

[0007] Optionally, a stirring device is provided in the drying section and the buffer bin respectively.

[0008] Optionally, the discharge port of the crushing section and / or the discharge port of the drying section is further provided with a spiral feeding mechanism.

[0009] Optionally, a conveying device is further provided between the crushing section and the drying section, and / or between the drying section and the buffer bin.

[0010] Optionally, the conveying device is a pneumatic conveying device, or the conveying device is a scraper conveyor.

[0011] Optionally, it also includes a control unit, which is electrically connected to the heating element, the feeder and an online flue gas monitor arranged in the furnace, respectively. The control unit can obtain denitrification data through the online flue gas monitor, and control the heating temperature of the heating element and the feeding amount of the feeder according to the denitrification data.

[0012] Optionally, the first switch valve is a time-delay valve, or the control unit is electrically connected to the first switch valve and opens and closes the first switch valve; the second switch valve is a time-delay valve, or the control unit is electrically connected to the second switch valve and opens and closes the second switch valve.

[0013] Optionally, the buffer bin is also provided with a heating device for heating the denitrification agent in the buffer bin.

[0014] Optionally, a weighing device is also provided at the bottom of the cache bin.

[0015] Optionally, it also includes a feeding part, which is connected to the feeding port of the crushing part and is used to introduce a denitrification agent into the crushing part.

[0016] Compared with the prior art, the dry denitration system provided in this application has the following technical effects:

[0017] Before the denitrification agent is sprayed into the furnace, it is pre-treated. Specifically, the denitrification agent is crushed by the crushing part so that the denitrification agent reaches the preset particle size requirement, and then the denitrification agent is dried by the drying part to ensure that the denitrification agent in the buffer is dry and small-particle denitrification agent. In this way, the denitrification agent can be prevented from being blocked in the injector, ensuring the smooth progress of the denitrification reaction, and at the same time, it can also improve the utilization rate of the denitrification agent and enhance the denitrification reaction effect.

[0018] Due to the setting of the first switch valve and the second switch valve, the denitrification agents in the crushing part, the drying part and the buffer part do not affect each other, and the crushing part and the drying part can operate at the same time to improve the pretreatment efficiency. The buffer part can ensure that there is a sufficient amount of denitrification agent to be used to meet the denitrification reaction requirements and ensure the stable operation of the denitrification reaction in the dry denitrification system. Specifically, there is no restriction on the specific volume of the crushing part, the drying part and the buffer bin, which can be set according to actual conditions.

[0019] In addition, in the dry denitrification system, the denitrification agent that has already been agglomerated can also be used. The agglomerated denitrification agent is crushed into a preset particle size through the crushing part, and then dried through the drying part. This can meet the use demand of the denitrification agent, reduce the waste of the denitrification agent, increase the utilization rate, and thus improve the economic benefits.

[0020] The dry denitration system provided in the present application can directly add a crushing section and a drying section on the basis of the existing dry denitration system, and has a simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a dry denitration system provided in an embodiment of the present application;

[0022] Figure 2 yes Figure 1 Detailed structural diagram of the crushing section and drying section.

[0023] Attached Figure 1-Figure 2 In the figure, the reference numerals are described as follows:

[0024] 1 Crushing part, 11 first switch valve; 2 Drying part, 21 second switch valve, 22 Heating element, 23 Stirring device; 3 Buffer bin, 31 Weighing device, 32 Feeder; 4 Ejector, 41 Main line, 42 Distributor, 43 Branch line, 44 Nozzle, 45 On-off valve; 5 Loading part; 6 Screw feeding mechanism; 7 Pneumatic conveying device; 8 Control part; 9 Furnace; 10 Flue gas online monitor. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] The present application embodiment provides a dry denitration system, such as Figure 1 As shown, the dry denitration system includes a crushing section 1, a drying section 2, a buffer chamber 3 and an injector 4 which are sequentially connected and arranged, wherein the crushing section 1 is used to crush the denitration agent to crush the denitration agent with a larger particle size into a preset particle size, and the drying section 2 is provided with a heating element 22. The crushed denitration agent can be heated by the heating element 22 when passing through the drying section 2 to remove moisture in the denitration agent and maintain the dryness of the denitration agent. Then, the dry denitration agent enters the buffer chamber 3 for buffering, and the injector 4 is used to inject the denitration agent into the furnace 9.

[0027] The discharge port of the buffer bin 3 is connected to the injector 4, and a feeder 32 is provided at the discharge port of the buffer bin 3. The buffer bin 3 can pass dry, small-particle denitrification agent into the injector 4 through the feeder 32. The feeder 32 can control the amount of denitrification agent entering the injector 4, and then control the amount of denitrification agent injected into the furnace 9 by the injector 4 to ensure the denitrification effect in the furnace 9.

[0028] The discharge port of the crushing section 1 is connected to the drying section 2 and is provided with a first switch valve 11. The discharge port of the drying section 2 is connected to the buffer bin 3 and is provided with a second switch valve 21. It takes a certain amount of time for the agglomerated denitrification agent to be crushed in the crushing section 1. Therefore, during the crushing process, the first switch valve 11 remains in a closed state. When the denitrification agent in the crushing section 1 is crushed to a preset particle size (such as 0.25mm-2mm), the first switch valve 11 is opened, and the crushed denitrification agent can enter the drying section 2 from the discharge port of the crushing section 1.

[0029] After the crushed reagent enters the drying section 2, the denitrification reagent is heated by the heating element 22, so that the denitrification reagent reaches a dry state to prevent subsequent agglomeration due to moisture. During the drying process of the denitrification reagent in the drying section 2, the second switch valve 21 is in a closed state. When the denitrification reagent in the drying section 2 is dried to a preset requirement (specifically, the temperature in the drying section 2 reaches a preset temperature, or the moisture in the drying section 2 reaches a preset range), the second switch valve 21 is opened, and the dried denitrification reagent can enter the buffer bin 3 from the discharge port of the drying section 2.

[0030] That is to say, before the denitrification agent is sprayed into the furnace 9, the denitrification agent is pre-treated, specifically, the denitrification agent is crushed by the crushing part 1 so that the denitrification agent reaches the preset particle size requirement, and then the denitrification agent is dried by the drying part 2 to ensure that the denitrification agent in the buffer bin 3 is dry and small-particle denitrification agent. In this way, the denitrification agent can be prevented from being blocked in the injector 4, ensuring the smooth progress of the denitrification reaction, and at the same time, the utilization rate of the denitrification agent and the denitrification reaction effect can be improved.

[0031] Due to the setting of the first switch valve 11 and the second switch valve 21, the denitrification agents in the crushing part 1, the drying part 2 and the buffer part do not affect each other, and the crushing part 1 and the drying part 2 can operate at the same time to improve the pretreatment efficiency. The buffer part can ensure that there is a sufficient amount of denitrification agent to be used to meet the denitrification reaction requirements and ensure the stable operation of the denitrification reaction in the dry denitrification system. Specifically, there is no restriction on the specific volumes of the crushing part 1, the drying part 2 and the buffer bin 3, which can be set according to actual conditions.

[0032] Moreover, in the dry denitrification system provided in the present embodiment, agglomerated denitrification agents can also be used. The agglomerated denitrification agents are crushed into a preset particle size by the crushing section 1, and then dried by the drying section 2. This can meet the use requirements of the denitrification agents, reduce the waste of the denitrification agents, increase the utilization rate, and thus improve the economic benefits.

[0033] The dry denitration system provided in this embodiment can be directly equipped with a crushing unit 1 and a drying unit 2 on the basis of an existing dry denitration system, and has a simple structure and low cost.

[0034] In this embodiment, a stirring device 23 is provided in the drying section 2 and the buffer bin 3, respectively, for stirring the denitrification agent, so that the denitrification agent is kept in a stirred state in both the drying section 2 and the buffer bin 3, thereby preventing the denitrification agent from being compressed more and more and forming lumps.

[0035] Specifically, in the present embodiment, there is no limitation on the specific structure of the stirring device 23. For example, the stirring device 23 may be configured to include a stirring motor and a stirring paddle, or the stirring device 23 may be configured to include a stirring motor and a stirring bin. In this case, stirring bins are respectively provided in the drying section 2 and the buffer bin 3. The denitrification agent is located in the stirring bin. The stirring motor drives the stirring bin to rotate, so that the denitrification agent keeps rolling in the stirring bin to avoid agglomeration.

[0036] Furthermore, in order to further ensure that the denitrification agent after pretreatment will not become damp and agglomerated, the mixed storage bin may also be provided with a heating device (not shown in the figure) for heating the denitrification agent in the buffer bin 3, thereby keeping the denitrification agent in the buffer bin 3 in a dry state and further reducing the risk of agglomeration.

[0037] Specifically, in this embodiment, there is no limitation on the specific structure of the heating element 22 and the heating device. For example, the heating plate may heat the denitration agent in the drying part 2 and the buffer bin 3 by electric heating, or the hot air system may heat the denitration agent in the drying part 2 and the buffer bin 3 by hot air. The structures of the heating key 22 and the heating device may be the same or different.

[0038] Furthermore, in this embodiment, there is no limitation on the specific structure of the crushing part 1, and the crushing part 1 may be a mechanism including a pulverizer or a grinding mechanism.

[0039] like Figure 2As shown, the discharge port of the crushing part 1 and the discharge port of the drying part 2 are also provided with a spiral feeding mechanism 6 respectively, or only the discharge port of the crushing part 1 is provided with a spiral feeding mechanism 6, or only the discharge port of the drying part 2 is provided with a spiral feeding mechanism 6. Of course, the discharge port of the crushing part 1 and the discharge port of the drying part 2 may not be provided with a spiral feeding mechanism 6, and the circulation of the denitrification agent is controlled only by the opening and closing of the first switch valve 11 and the second switch valve 21. The setting of the spiral feeding mechanism 6 can avoid the situation where the first switch valve 11 and the second switch valve 21 are blocked.

[0040] like Figure 2 As shown, conveying devices are respectively provided between the crushing section 1 and the drying section 2 and between the drying section 2 and the buffer bin 3. Specifically, the conveying device provided between the crushing section 1 and the drying section 2 is used to convey the denitrification agent crushed by the crushing section 1 to the drying section 2, and the conveying device provided between the drying section 2 and the buffer bin 3 is used to convey the denitrification agent after drying to the buffer bin 3.

[0041] Of course, in this embodiment, the crushing part 1 can also be directly arranged above the drying part 2, so that the discharge port of the crushing part 1 is located directly above the feed port of the drying part 2, and when the first switch valve 11 is opened, the denitration agent in the crushing part 1 directly falls into the drying part 2. The drying part 2 can also be directly arranged above the buffer bin 3, so that the discharge port of the drying part 2 is located directly above the feed port of the buffer bin 3, and when the second switch valve 21 is opened, the denitration agent in the drying part 2 directly falls into the buffer bin 3.

[0042] The provision of the conveying device can improve the flexibility of the placement of the crushing section 1, the drying section 2 and the buffer section, and can be specifically provided according to actual conditions. Of course, the conveying device may be provided only between the crushing section 1 and the drying section 2, or may be provided between the drying section 2 and the buffer bin 3.

[0043] The specific structure of the conveying device is not limited, and the conveying device can be as follows Figure 2 The pneumatic conveying device 7 shown specifically includes the structure of an air supply pipe and a Roots blower. The denitrification agent can be sent into the next component along the air supply pipe through the Roots blower. Alternatively, the conveying device can be set as a scraper conveyor, or one conveying device is the pneumatic conveying device 7 and the other conveying device is a scraper conveyor.

[0044] A weighing device 31 is also provided at the bottom of the buffer bin 3 for weighing the denitrification agent in the buffer bin 3. The amount of the denitrification agent in the buffer bin 3 can be known through the weighing device 31. If the amount of the denitrification agent in the buffer bin 3 is small, it may lead to the inability to meet the denitrification reaction in the furnace 9. At this time, the amount of the denitrification agent introduced into the crushing part 1 is increased. If the amount of the denitrification agent in the buffer bin 3 is large, the amount of the denitrification agent introduced into the crushing part 1 can be appropriately reduced to keep the amount of the system denitrification agent stable. While ensuring the stable progress of the denitrification reaction, it can also avoid the situation where the denitrification agent accumulates in the buffer bin 3 in large amounts, further reducing the risk of agglomeration of the denitrification agent.

[0045] like Figure 1 As shown, the dry denitration system also includes a feeding part 5, which is connected to the feed port of the crushing part 1 and is used for introducing a denitration agent into the crushing part 1. Of course, there is no limitation on the method of introducing the denitration agent into the crushing part 1. For example, the denitration agent can be manually poured into the feed port of the crushing part 1. When the denitration agent is mechanically introduced into the crushing part 1 through the feeding part 5, manual operation can be simplified, intelligent application can be improved, and the amount of introduction can be conveniently controlled.

[0046] A flue gas online monitor 10 is also provided in the furnace 9 for monitoring the flue gas denitration reaction in the furnace 9 . Specifically, various components can be adjusted according to the monitoring results of the flue gas online monitor 10 .

[0047] like Figure 1 As shown, the dry denitration system also includes a control unit 8, which is electrically connected to the crushing unit 1, the heating element 22, the feeder 32, the heating device, the stirring device 23, the ejector 4 and the flue gas online monitor 10, etc., respectively. Specifically, the electrical connection can be achieved through a connecting line or a wireless connection. The control unit 8 can obtain denitration data according to the flue gas online monitor 10, and the denitration data can reflect the denitration reaction in the furnace 9. The control unit 8 can control the heating temperature (such as 30°C-60°C) of the heating element 22, the feeding amount of the feeder 32, and the injection amount of the ejector 4 according to the denitration data.

[0048] Specifically, how the control unit 8 is electrically connected to the heating element 22, the feeder 32, the flue gas online monitor 10, etc. and how to adjust each component according to the denitration data is already a well-known prior art for those skilled in the art. In the embodiment of the present application, a new control device is not developed, but the existing control unit 8 is electrically connected to each component to improve the operability of the dry denitration system and ensure the smooth and stable operation of the dry denitration reaction.

[0049] In this embodiment, the first switch valve 11 and the second switch valve 21 can be delay valves. The switch interval time of the first switch valve 11 is set according to the crushing time requirement of the crushing part 1, and the switch interval time of the second switch valve 21 is set according to the drying time requirement of the drying part 2.

[0050] Alternatively, the first switch valve 11 and the second switch valve 21 may be both configured as solenoid valves and electrically connected to the control unit 8 respectively. The control unit 8 may control the switching of the first switch valve 11 and the second switch valve 21 according to specific circumstances.

[0051] like Figure 1 As shown, the ejector 4 includes a main line 41, a distributor 42 and at least two branches 43 connected in sequence, each branch 43 is connected to a plurality of nozzles 44, the nozzles 44 are arranged in the furnace 9 and can spray denitration reagents into the furnace 9, and each nozzle 44 can be arranged along the axial and circumferential directions of the furnace 9, and the specific position is not limited. The ejector 4 distributes the denitration reagents introduced into the buffer bin 3 to each nozzle 44 along the main line 41, the distributor 42 and the branch 43 through the pneumatic conveying device 7, and the nozzles 44 spray them into the furnace 9.

[0052] Each branch 43 is provided with an on-off valve 45 , which is electrically connected to the control unit 8 . The control unit 8 can control the on-off of the branch 43 through the on-off valve 45 , and further control the opening and closing of the nozzle 44 to meet the denitrification reaction requirements in the furnace 9 .

[0053] The following three groups of experiments were conducted using the dry denitration system provided in the application examples:

[0054] Experiment 1: A waste incinerator with a daily burning capacity of 750 tons was used to feed about 5 tons of damp and agglomerated denitrification agent into the dry denitrification system provided in this embodiment. The original particle size of the denitrification agent was relatively large, about 50mm-100mm. After being crushed by the crushing section, the particle size was about 0.5mm-2mm, meeting the particle size requirement of conventional dry denitrification agent. Subsequently, the denitrification agent was passed into the drying section through a pneumatic conveying device, and the material was unloaded after a drying time of 60 minutes. Subsequently, the material was passed into the buffer bin through a pneumatic conveying device 7 and put into use. The experiment was carried out for 6 days, and the system operated normally without blockage or backwind.

[0055] In addition, this test adopts the "SNCR (Selective Non-Catalytic Reduction) combined with dry denitrification" method for denitrification. The average daily consumption of dry denitrification is 1.2kg / t of garbage, and the single consumption of ammonia is 3.2L / t of garbage. The final flue gas emission is NO x Average 66mg / Nm 3 、Ammonia escape 1.89mg / Nm 3 , meeting local emission standards.

[0056] For denitrification agents that are heavy and agglomerated due to moisture, the dry denitrification system provided in the embodiment of the present application has not experienced blockage or backflow during the 6-day denitrification reaction, thereby ensuring the smooth progress of the denitrification reaction and the efficiency of the denitrification reaction.

[0057] Experiment 2: In a waste incinerator with a daily burning capacity of 750 tons, about 2 tons of damp and agglomerated denitrification agent was sent into the dry denitrification system provided in this embodiment for dry denitrification. At the same time, a group of comparative experiments were conducted, specifically, about 2 tons of non-damp and agglomerated denitrification agent was used for dry denitrification. The experiments were carried out for 2 days, and the denitrification method of "combining SNCR and dry denitrification" was adopted.

[0058] The final flue gas emissions of NO under the two working conditions of the final reaction x The average values ​​were 71 mg / Nm 3 and 68mg / Nm 3 and ammonia escape were 1.95 mg / Nm 3 and 1.89mg / Nm 3 , which can meet the local flue gas emission standards. It also illustrates that the dry denitrification system provided by this embodiment can make the damp and agglomerated denitrification agent regain the denitrification effect and make it equivalent to the normal non-agglomerated denitrification agent, effectively reducing the waste of denitrification agent and reducing costs.

[0059] Experiment 3: In a waste incinerator with a daily burning capacity of 750 tons, 2 tons of normal dry denitrification agent (particle size 1mm-2mm) were sent into the dry denitrification system provided in this embodiment. After being crushed by the crushing part, the particle size of the denitrification agent became smaller to 0.25mm-1.5mm, and then participated in the denitrification reaction. At the same time, a group of comparative experiments were also carried out, specifically, about 2 tons of normal dry denitrification agent (particle size 1mm-2mm) was sent into the dry denitrification system in the prior art to directly participate in the denitrification reaction. The experiments were carried out for 2 days, and the denitrification method of "SNCR combined with dry denitrification" was adopted.

[0060] The final flue gas emissions of NO under the two working conditions of the final reaction x The average values ​​were 54 mg / Nm 3 and 68mg / Nm 3 and ammonia escape were 1.23 mg / Nm 3 and 1.89mg / Nm 3 , can meet the local flue gas emission standards, and the denitrification efficiency of the denitrification reaction performed by the dry denitrification system provided in this embodiment is significantly higher.

[0061] It can be seen that in the dry denitration system provided in this embodiment, the denitration agent can be effectively crushed into smaller particle sizes by the crusher, which is beneficial to improving the denitration reaction efficiency.

[0062] The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A dry denitration system, characterized in that: It comprises a crushing part (1), a drying part (2), a buffer chamber (3) and an ejector (4) which are arranged in sequence; The crushing part (1) is used to crush the denitrification agent into a preset particle size, the drying part (2) is provided with a heating element (22) and is used to dry the denitrification agent, and the buffer chamber (3) is used to store the denitrification agent after drying; The discharge port of the crushing part (1) is connected to the drying part (2) and is provided with a first switch valve (11); The material outlet of the drying section (2) is communicated with the buffer bin (3) and is provided with a second switch valve (21); The discharge port of the buffer bin (3) is connected to the injector (4) and is provided with a feeder (32). The injector is used to inject the denitrification agent into the furnace (9).

2. The dry denitration system according to claim 1, characterized in that: The drying section (2) and the buffer chamber (3) are respectively provided with stirring devices (23).

3. The dry denitration system according to claim 1, characterized in that: The discharge port of the crushing section (1) and / or the discharge port of the drying section (2) is also provided with a spiral feeding mechanism (6).

4. The dry denitration system according to claim 1, characterized in that: A conveying device is also provided between the crushing section (1) and the drying section (2), and / or between the drying section (2) and the buffer bin (3).

5. The dry denitration system according to claim 4, characterized in that: The conveying device is a pneumatic conveying device (7), or the conveying device is a scraper conveyor.

6. The dry denitration system according to any one of claims 1 to 5, characterized in that: The invention also includes a control unit (8), wherein the control unit (8) is electrically connected to the heating element (22), the feeder (32) and an online flue gas monitor (10) disposed in the furnace (9), respectively. The control unit (8) can obtain denitration data through the online flue gas monitor (10), and control the heating temperature of the heating element (22) and the feeding amount of the feeder (32) according to the denitration data.

7. The dry denitration system according to claim 6, characterized in that: The first switch valve (11) is a time-delay valve, or the control unit (8) is electrically connected to the first switch valve (11) and opens and closes the first switch valve (11); The second switch valve (21) is a time-delay valve, or the control unit (8) is electrically connected to the second switch valve (21) and opens and closes the second switch valve (21).

8. The dry denitration system according to any one of claims 1 to 5, characterized in that: The buffer storehouse (3) is also provided with a heating device, and is used to heat the denitrification agent in the buffer storehouse (3).

9. The dry denitration system according to any one of claims 1 to 5, characterized in that: A weighing device (31) is also provided at the bottom of the buffer bin (3).

10. The dry denitration system according to any one of claims 1 to 5, characterized in that: It also comprises a feeding part (5), which is connected to the feeding port of the crushing part (1) and is used to introduce a denitrification agent into the crushing part (1).

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