An electron beam ammonia flue gas desulfurization and denitrification reaction tower, device and process

Abstract

The present invention provides an electron beam ammonia flue gas desulfurization and denitrification reaction tower, device and process. The reaction tower includes an inner tower, an outer tower sleeved outside the inner tower. A reaction zone is formed between the outer tower and the inner tower. The top of the outer tower is provided with a tower top, and a flue gas outlet is opened at the bottom of the side wall of the outer tower. An interlayer is arranged outside the outer tower, and a plurality of electron accelerators are arranged in the interlayer. When the plurality of electron accelerators work, they can emit electron beams into the reaction zone. A flue gas inlet is opened at the bottom of the side wall of the inner tower, and a gas outlet is opened at the top of the inner tower. A spray grid and an ammonia injection grid are sequentially arranged in the inner tower from bottom to top. The spray grid and the ammonia injection grid divide the inner tower into a cooling spray chamber, an intermediate chamber and an ammonia injection chamber from bottom to top in sequence. The present invention can simultaneously achieve flue gas desulfurization and denitrification and improve the efficiency of flue gas desulfurization and denitrification.

Description

Technical Field

[0001] The present invention relates to an electron beam ammonia flue gas desulfurization and denitrification reaction tower, device and process, belonging to the technical field of flue gas post-treatment. Background Technique

[0002] The research on electron beam desulfurization and denitrification technology abroad originated from Japan in the late 1980s. At that time, the Japan Atomic Energy Research Institute and Ebara Corporation found that flue gas could be desulfurized and denitrified simultaneously by electron irradiation. However, since the electron source requires a large-capacity electron accelerator (an electron beam with an electron energy of 800 keV - 1 MeV), the high power, high energy consumption and high price of the electron source greatly restricted its development and application. Later, Ebara Corporation further studied this technology. Before the gas enters the irradiation chamber, an appropriate amount of NH3 is added to the gas. The added appropriate amount of NH3 can greatly improve the desulfurization and denitrification effect, removing most of the SO2 and 85% - 90% of the NOx in the flue gas; the by-products obtained by this technology are a mixture of (NH4)2SO4 and NH4NO3, which can be widely used as fertilizers and modifiers for alkaline soils.

[0003] According to the research of Tokunaga et al., the electron beam absorption dose has a direct impact on the flue gas desulfurization and denitrification effect. This is because: a large number of free radicals are generated after the flue gas is irradiated by the electron beam. The free radicals promote a large amount of SO2 and NOx to be oxidized to high-valent oxides and react with the moisture in the reactor and the injected NH3 to generate (NH4)2SO4 and NH4NO3. The influence degree of the electron beam absorption dose on the desulfurization process and the denitrification process is different. The free radicals generated by electron beam irradiation only oxidize SO2, while some free radicals have a reducing effect on NOx. When the SO2 removal rate reaches 90%, the electron beam absorption dose is 9 kGy, but when NOx has the same removal rate, the electron beam absorption dose needs to reach 27 kGy.

[0004] Temperature also has a relatively significant impact on the electron beam desulfurization and denitrification effect. The essence of this method is a neutralization reaction, and this exothermic process will be inhibited in a high-temperature environment. In addition, when the flue gas temperature is relatively high, the ionic Brownian motion intensifies, causing a large part of the energy of the electron beam to be lost in ion collisions. Therefore, a high-temperature environment is not conducive to the desulfurization and denitrification of this process.

[0005] The flue gas humidity also has an important impact on the electron beam desulfurization and denitrification effect. During the electron beam desulfurization and denitrification process, H3O + in water undergoes a molecule-ion reaction to generate ·OH free radicals, and this ·OH free radical plays an important role in the oxidation of NOx and SO2. In addition, the increase in moisture increases the probability of liquid-phase reactions, which is conducive to the nucleation and growth of aerosols. Therefore, a low-temperature and high-humidity flue gas environment is conducive to the electron beam desulfurization and denitrification process.

[0006] After summarizing the existing research results and engineering examples, the applicant found that the following problems still exist in the electron beam ammonia method for flue gas desulfurization and denitrification:

[0007] 1. The by-products (NH4)2SO4 and NH4NO3 produced by the electron beam ammonia method for flue gas desulfurization and denitrification have the characteristics of hygroscopicity and small particle size, and are extremely easy to escape from the dust collector.

[0008] 2. The compressor of the ammonia injection system used in the electron beam ammonia method for flue gas desulfurization and denitrification will have the problem of liquid carrying by the crankshaft, and there is also a certain amount of ammonia escape in the system.

[0009] 3. In order to achieve a higher oxidation efficiency, a larger electron beam radiation absorption dose is often required, resulting in greater energy consumption.

[0010] Therefore, providing a new type of reaction tower, device and process for electron beam ammonia method for flue gas desulfurization and denitrification has become an urgent technical problem in this field. Summary of the Invention

[0011] In order to solve the above-mentioned disadvantages and deficiencies, an object of the present invention is to provide a reaction tower for electron beam ammonia method for flue gas desulfurization and denitrification.

[0012] Another object of the present invention is also to provide a device for electron beam ammonia method for flue gas desulfurization and denitrification.

[0013] Still another object of the present invention is also to provide a process for electron beam ammonia method for flue gas desulfurization and denitrification.

[0014] In order to achieve the above purposes, on the one hand, the present invention provides a reaction tower for electron beam ammonia method for flue gas desulfurization and denitrification, wherein the reaction tower for electron beam ammonia method for flue gas desulfurization and denitrification includes:

[0015] An inner tower, an outer tower sleeved outside the inner tower, a reaction zone is formed between the outer tower and the inner tower, the top of the outer tower is provided with a tower top, and a flue gas outlet is opened at the bottom of the side wall of the outer tower;

[0016] A sandwich is arranged outside the outer tower, and a plurality of electron accelerators are arranged in the sandwich. When the plurality of electron accelerators work, they can emit electron beams into the reaction zone;

[0017] A flue gas inlet is opened at the bottom of the side wall of the inner tower, and a gas outlet is opened at the top of the inner tower; a spray grid and an ammonia injection grid are sequentially arranged in the inner tower from bottom to top, and the spray grid and the ammonia injection grid divide the inner tower into a cooling spray chamber, an intermediate chamber and an ammonia injection chamber from bottom to top.

[0018] As a specific embodiment of the reaction tower described above in the present invention, a partition is inclinedly arranged in the middle cavity, and the partition is provided with partition openings. Inclinedly arranging the partition in the middle cavity can further ensure the spraying effect.

[0019] As a specific embodiment of the reaction tower described above in the present invention, the inclination angle formed by the partition and the horizontal direction is 10-30°.

[0020] As a specific embodiment of the reaction tower described above in the present invention, the partition openings are opened at the higher end of the inclined partition.

[0021] As a specific embodiment of the reaction tower described above in the present invention, the partition openings are opened at 1 / 6-1 / 4 of the length of the partition.

[0022] As a specific embodiment of the reaction tower described above in the present invention, the size of the partition openings is 15%-35% of the inner diameter of the inner tower.

[0023] As a specific embodiment of the reaction tower described above in the present invention, both the inner tower and the outer tower are cylindrical, and an annular reaction zone is formed between the outer tower and the inner tower.

[0024] In the present invention, the reaction zone where electron beam radiation occurs in the reaction tower is designed as an annular structure, which can prevent the electron energy from being completely attenuated during the process of penetrating the flue gas layer, and thus free radicals are generated at all positions where the reaction zone is used.

[0025] As a specific embodiment of the reaction tower described above in the present invention, a plurality of support columns are arranged at the outer top of the inner tower to support the tower top.

[0026] As a specific embodiment of the reaction tower described above in the present invention, the tower top is designed with an arc shape to avoid excessive local pressure.

[0027] In the reaction tower provided by the present invention, the internal structure of the inner tower is similar to that of a cyclone dust collector, including a cooling spray chamber, an intermediate chamber, and an ammonia injection chamber from bottom to top. During operation, the flue gas enters horizontally from the bottom of the cooling spray chamber, forming a gas flow with a relatively high degree of turbulence inside the inner tower. A spray grid is provided at the top of the cooling spray chamber, which can spray a spray liquid into the cooling spray chamber to humidify and cool the flue gas. Subsequently, the flue gas enters the ammonia injection chamber through the opening in the partition. Among them, the partition with an opening in the partition inclinedly arranged in the intermediate chamber can make the flue gas tend to enter the ammonia injection chamber in the horizontal direction, making the gas flow direction in the inner tower more similar to the internal gas flow direction of the cyclone dust collector. In the ammonia injection chamber, ammonia gas is sprayed into the ammonia injection chamber from the ammonia injection grid arranged at the bottom of the ammonia injection chamber, so that the ammonia gas and the flue gas are fully mixed. In summary, in the reaction tower provided by the present invention, the inner tower adopts a cyclone dust removal type design, increasing the degree of turbulence of the flue gas, and enabling the humidification and cooling process and the mixing process of the flue gas and NH3 to be more sufficient.

[0028] In the reaction tower provided by the present invention, a plurality of electron accelerators are arranged in the interlayer, and when the plurality of electron accelerators work, they can emit electron beams into the reaction area, which can avoid harm to the health of nearby operators caused by radiation.

[0029] On the other hand, the present invention also provides an electron beam ammonia method flue gas desulfurization and denitrification device, wherein the electron beam ammonia method flue gas desulfurization and denitrification device includes a first dust collector, the above-mentioned electron beam ammonia method flue gas desulfurization and denitrification reaction tower, a second dust collector, and an air preheater;

[0030] The gas outlet of the first dust collector is connected to the flue gas inlet of the electron beam ammonia method flue gas desulfurization and denitrification reaction tower through a pipeline, and the flue gas outlet of the electron beam ammonia method flue gas desulfurization and denitrification reaction tower is connected to a chimney through a pipeline via the second dust collector and the air preheater in sequence.

[0031] As a specific embodiment of the above-mentioned device of the present invention, the first dust collector includes a bag filter and / or an electrostatic precipitator; the second dust collector is an electrostatic precipitator or an electrostatic bag combined dust collector.

[0032] Among them, the electrostatic precipitator used as the first dust collector and the second dust collector includes a dry electrostatic precipitator and / or a wet electrostatic precipitator.

[0033] As a specific embodiment of the above-mentioned device of the present invention, a hopper is provided in the second dust collector for collecting by-products, and the hopper needs to be unloaded regularly.

[0034] On yet another aspect, the present invention also provides an electron beam ammonia method flue gas desulfurization and denitrification process, wherein the process uses the above-mentioned electron beam ammonia method flue gas desulfurization and denitrification device, and it includes:

[0035] (1) The flue gas to be treated enters the first dust collector for dust removal;

[0036] (2) The flue gas after dust removal enters the electron beam ammonia-based flue gas desulfurization and denitrification reaction tower, and a spraying liquid is sprayed in the cooling spray cavity to humidify and cool the flue gas; subsequently, the flue gas enters the ammonia spraying cavity and is fully mixed with ammonia in the ammonia spraying cavity;

[0037] (3) The mixed gas obtained in step (2) enters the reaction zone, and in the reaction zone, the mixed gas is irradiated by an electron beam to make the components therein fully react;

[0038] (4) The flue gas after the reaction in step (3) enters the second dust collector through the flue gas outlet for dust removal to collect the reaction by-products;

[0039] (5) The flue gas after dust removal is preheated by an air preheater and then discharged.

[0040] As a specific embodiment of the above-mentioned process of the present invention, in step (2), the spraying liquid includes water or other oxidizing solutions.

[0041] Among them, in a specific embodiment of the present invention, the oxidizing solution includes a H2O2 solution with a mass concentration of 10% or a dilute aqueous sodium persulfate solution. In the dilute aqueous sodium persulfate solution, the mass ratio of sodium persulfate to water is 1:100. When the treatment of NOx in the flue gas to be treated is not ideal, then a 10% H2O2 solution can be used for spraying in step (2) to pre-oxidize part of the NOx in the flue gas, thereby improving the denitrification effect; when the treatment of SO2 in the flue gas to be treated is not ideal, then a dilute aqueous sodium persulfate solution can be used to pre-absorb more SO2 in step (2) in order to further improve the desulfurization effect.

[0042] As a specific embodiment of the above-mentioned process of the present invention, in step (2), the humidifying and cooling of the flue gas is to make the relative humidity (RH) of the flue gas reach 80 - 100%, and the flue gas temperature is reduced to 47 - 91°C.

[0043] As a specific embodiment of the above-mentioned process of the present invention, in step (3), the absorbed dose of the electron beam radiation is 3 - 27 kGy.

[0044] In the specific embodiment of the above-mentioned process of the present invention, the appropriate absorbed dose of the electron beam radiation can be controlled by adjusting the electron beam energy intensity and radiation time of the electron accelerator, and the absorbed dose can be accurately measured by conventional instruments existing in the art.

[0045] As a specific embodiment of the above-mentioned process of the present invention, in step (3), the electron beam energy intensity is 0.5 - 1.0 MeV.

[0046] In step (3) of the above-described process of the present invention, the mixed gas enters the reaction zone, and in the reaction zone, the mixed gas is irradiated by an electron beam. After the flue gas in the mixed gas is irradiated by the electron beam, a large number of free radicals are generated. The free radicals then oxidize the SO2 and NOx contained in the flue gas into higher-valent oxides, and the higher-valent oxides react with NH3 and the moisture in the flue gas to form small particles of (NH4)2SO4 and NH4NO3.

[0047] In addition, since the aerosol particles generated by the reaction in step (3) are extremely small, an electrostatic precipitator or an electrostatic-bag combined precipitator can be used in step (4) to remove dust from the flue gas in order to collect the reaction by-products.

[0048] As a specific embodiment of the above-described process of the present invention, in step (5), the preheating is to raise the flue gas temperature to 65 - 95 °C.

[0049] The electron beam ammonia process flue gas desulfurization and denitrification device and method provided by the present invention can achieve flue gas desulfurization and denitrification, and at the same time, by-products can be recovered. The start-up and shutdown are extremely convenient. The flue gas desulfurization and denitrification efficiency can be adjusted at any time by adjusting the electron beam dose and temperature, and it has strong adaptability to system load changes. In addition, the device and method can improve the removal effect of pollutants in the flue gas (i.e., improve the flue gas desulfurization and denitrification efficiency), and save more floor space, having certain industrial application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0051] Figure 1 It is a schematic structural diagram of an electron beam ammonia process flue gas desulfurization and denitrification reaction tower provided in Embodiment 1 of the present invention.

[0052] Figure 2 It is a schematic structural diagram of an electron beam ammonia process flue gas desulfurization and denitrification device provided in Embodiment 2 of the present invention.

[0053] Figure 3 It is a schematic diagram of the removal rate results of NOx and SO2 after the flue gas is treated in Embodiment 3 of the present invention and Comparative Examples 1 - 3.

[0054] Figure 4 It is a schematic structural diagram of a conventional electron beam ammonia process flue gas desulfurization and denitrification device used in Comparative Example 3.

[0055] Main reference numeral descriptions:

[0056] Figure 1 Among them: 1 - flue gas inlet, 2 - cooling spray chamber, 3 - ammonia injection chamber, 4 - reaction zone, 5 - interlayer, 6 - flue gas outlet, 7 - ammonia injection grid, 8 - partition board, 9 - support column, 10 - electron accelerator, 11 - opening on the partition board, 12 - tower top, 13 - spray grid.

[0057] Figure 2 Among them: 14 - first dust collector, 15 - electron beam ammonia-based flue gas desulfurization and denitrification reaction tower, 16 - second dust collector, 17 - air preheater, 18 - chimney.

[0058] Figure 4 Among them: 10 - electron accelerator, 14 - first dust collector, 16 - second dust collector, 17 - air preheater, 18 - chimney, 19 - cooling and humidifying device, 20 - straight pipe. Specific implementation manners

[0059] For a clearer understanding of the technical features, objectives, and beneficial effects of the present invention, the following detailed description of the technical solution of the present invention is provided in combination with the following specific embodiments, but it should not be construed as a limitation on the implementable scope of the present invention.

[0060] It should be noted that the term "including" and any variations thereof in the description and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or devices.

[0061] In the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "middle", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit that the indicated device, element, or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0062] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to the specific circumstances.

[0063] In addition, the terms "arranged" and "connected" in the present invention should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or an internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] Embodiment 1

[0065] This embodiment provides an electron beam ammonia flue gas desulfurization and denitrification reaction tower, and its structural schematic diagram is as Figure 1 shown. It can be seen from Figure 1 that the reaction tower includes:

[0066] A cylindrical inner tower, a cylindrical outer tower sleeved outside the inner tower. A circular reaction zone 4 is formed between the outer tower and the inner tower. The top of the outer tower is hermetically provided with a tower top 12, and a flue gas outlet 6 is opened at the bottom of the side wall of the outer tower;

[0067] A sandwich layer 5 is arranged outside the outer tower, and a plurality of electron accelerators 10 are arranged in the sandwich layer 5. When the plurality of electron accelerators 10 work, they can emit electron beams into the reaction zone 4;

[0068] A plurality of support columns 9 are arranged at the outer top of the inner tower to support the tower top 12;

[0069] A flue gas inlet 1 is opened at the bottom of the side wall of the inner tower, and a gas outlet is opened at the top of the inner tower. Inside the inner tower, a spray grid 13 and an ammonia injection grid 7 are sequentially arranged from bottom to top. The spray grid 13 and the ammonia injection grid 7 divide the inner tower into a cooling spray cavity 2, an intermediate cavity and an ammonia injection cavity 3 from bottom to top in sequence;

[0070] A partition plate 8 is inclinedly arranged in the intermediate cavity. The partition plate 8 is provided with a partition plate opening 11. Specifically, the inclination angle of the partition plate 8 with respect to the horizontal direction is 10-30°; the partition plate opening 11 is opened at the higher end of the inclined partition plate 8 in height, and the partition plate opening 11 is opened at 1 / 6-1 / 4 of the length of the partition plate 8; the size of the partition plate opening 11 is 15%-35% of the inner diameter of the inner tower.

[0071] In this embodiment, the inner diameter of the inner tower is 700 mm, the inner diameter of the outer tower is 1000 mm. The sandwich layer is only used to place the electron accelerator, and its thickness is variable; the tower top is an elliptical dome with a short radius (inner diameter) of 300 mm, and the diameters (inner diameters) of the pipes connected to the flue gas inlet and the flue gas outlet are 400 mm.

[0072] Embodiment 2

[0073] This embodiment provides an electron beam ammonia flue gas desulfurization and denitrification device, and its structural schematic diagram is as shown in Figure 2 shown. It can be seen from Figure 2 that the device includes:

[0074] a first dust collector 14, an electron beam ammonia flue gas desulfurization and denitrification reaction tower 15 provided in Embodiment 1, a second dust collector 16, an air preheater 17 and a chimney 18;

[0075] The gas outlet of the first dust collector 14 is connected to the flue gas inlet 1 of the electron beam ammonia flue gas desulfurization and denitrification reaction tower 15 through a pipeline, and the flue gas outlet 6 of the electron beam ammonia flue gas desulfurization and denitrification reaction tower 15 is connected to the chimney 18 through the second dust collector 16 and the air preheater 17 in sequence through a pipeline.

[0076] In this embodiment, the first dust collector 14 is a bag filter, and the filter material used is a PTFE filter material with a filtration area of 2 m 2 . The second dust collector 16 is a dry electrostatic precipitator, and a hopper is also provided in the dry electrostatic precipitator for collecting by-products. The air preheater uses a tubular furnace.

[0077] Embodiment 3

[0078] This embodiment provides an electron beam ammonia flue gas desulfurization and denitrification process. The process uses the electron beam ammonia flue gas desulfurization and denitrification device provided in Embodiment 2, and it includes the following specific steps:

[0079] (1) The flue gas to be treated enters the first dust collector from the bottom air inlet of the first dust collector to remove larger particulate dust;

[0080] (2) The flue gas after dust removal in step (1) enters the cooling spray chamber of the electron beam ammonia flue gas desulfurization and denitrification reaction tower along the horizontal direction. The spray grid sprays the spray liquid (water) into the cooling spray chamber, so that the flue gas is in full contact with the spray liquid (water) in the cooling spray chamber, and then the flue gas temperature is reduced to 70 °C and the relative humidity is above 95%;

[0081] The humidified and cooled flue gas enters the ammonia injection chamber and is fully mixed with ammonia gas in the ammonia injection chamber; among them, the ammonia injection grid is arranged at the bottom of the ammonia injection chamber, and the ammonia gas source is 5 vol% NH3 / N2, that is, based on the total volume of ammonia gas and nitrogen gas used as the carrier gas being 100%, the volume concentration of ammonia gas is 5%;

[0082] (3) The mixed gas obtained in step (2) enters the reaction zone, and in the reaction zone, the mixed gas is irradiated by the electron beam emitted by the electron accelerator, so that the components in the mixed gas fully react;

[0083] In step (3), the electron beam energy intensity is successively controlled at 0.5 MeV, 0.7 MeV, and 1.0 MeV for three tests;

[0084] In step (3), the absorbed dose of the electron beam radiation can be controlled by adjusting the above electron beam energy intensity and radiation time of the electron accelerator, and it is ensured that the absorbed dose of the electron beam radiation is within the range of 3 - 27 kGy;

[0085] (4) The flue gas after the full reaction in step (3) enters the second dust collector through the flue gas outlet for dust removal, and the fine particle by-products of (NH4)2SO4 and NH4NO3 in the flue gas are removed and recovered;

[0086] (5) The flue gas after dust removal in step (4) is heated to 90 °C by an air preheater (tubular furnace) and then discharged to the fume hood through the chimney.

[0087] In this embodiment, the flue gas to be treated includes zeolite powder (simulated dust) with a particle size of 5 - 1000 μm and a concentration of 250 mg / m 3 , SO2 with a concentration of 1000 mg / m 3 , NO with a concentration of 400 mg / m 3 , O2 with a concentration of 8 vol%; the flue gas temperature is 200 °C, the gas volume is 1 m 3 / h, the carrier gas is N2, the NH3 injection amount is 450 mg / m 3 , and the amount of the spray liquid (water) is determined by being able to reduce the flue gas temperature to 70 °C.

[0088] Detect the concentrations of NOx and SO2 in the flue gas treated in this embodiment, and calculate the removal rates of NOx and SO2 respectively. The obtained experimental results are shown in Figure 3 .

[0089] Comparative Example 1

[0090] This comparative example provides an electron beam ammonia-based flue gas desulfurization and denitrification process, and the difference from Example 3 is only that: in step (2), the spray water reduces the flue gas temperature to 40 °C.

[0091] Detect the concentrations of NOx and SO2 in the flue gas treated in this comparative example, and calculate the removal rates of NOx and SO2 respectively. The obtained experimental results are shown in Figure 3 .

[0092] Comparative Example 2

[0093] This comparative example provides an electron beam ammonia-based flue gas desulfurization and denitrification process, and the difference from Example 3 is only that: in step (2), the spray water reduces the flue gas temperature to 100 °C.

[0094] Detect the concentrations of NOx and SO2 in the flue gas treated in this comparative example, and calculate the removal rates of NOx and SO2 respectively. The obtained experimental results are shown in Figure 3 .

[0095] Comparative Example 3

[0096] This comparative example provides an electron beam ammonia method for flue gas desulfurization and denitrification. The difference between it and Example 3 is only that: the device used in this comparative example is a conventional electron beam ammonia method flue gas desulfurization and denitrification device in the art, rather than the electron beam ammonia method flue gas desulfurization and denitrification device provided in Example 2; specifically, the main difference between the conventional electron beam ammonia method flue gas desulfurization and denitrification device in the art and the electron beam ammonia method flue gas desulfurization and denitrification device provided in Example 2 lies in the electron beam ammonia method flue gas desulfurization and denitrification reaction tower. The structural schematic diagram of the conventional electron beam ammonia method flue gas desulfurization and denitrification device in the art is as shown in Figure 4 . It can be seen from Figure 4 that the first dust collector 14 in the device is connected to the inlet of the cooling and humidifying device 19 through a pipeline, the outlet of the cooling and humidifying device 19 is connected to one end of a straight pipe (with a diameter of 400 mm) 20 through a pipeline, and the other end of the straight pipe 20 is connected to the chimney 18 through a pipeline via the second dust collector 16 and the air preheater 17 in sequence; several electron accelerators 10 are arranged outside the straight pipe 20, and the ammonia injection point is set at the inlet end of the straight pipe 20.

[0097] Detect the concentrations of NOx and SO2 in the flue gas treated in this comparative example, and calculate the removal rates of NOx and SO2 respectively. The obtained experimental results are shown in Figure 3 .

[0098] It can be seen from Figure 3 that the removal rates of NOx and SO2 in the flue gas in Example 3 of the present invention are correspondingly higher than those of the flue gas in Comparative Documents 1-3.

[0099] In summary, the electron beam ammonia method flue gas desulfurization and denitrification device and method provided in the embodiments of the present invention can achieve flue gas desulfurization and denitrification, and at the same time can recover by-products. The start-up and shutdown are extremely convenient. The flue gas desulfurization and denitrification efficiency can be adjusted at any time by adjusting the electron beam dose and temperature, and it has strong adaptability to the change of system load; in addition, the device and method can improve the removal effect of pollutants in the flue gas (that is, improve the flue gas desulfurization and denitrification efficiency), and save more floor space, and has certain industrial application value.

[0100] The above are only specific embodiments of the present invention and cannot be used to limit the scope of the invention. Therefore, the replacement of equivalent components or equivalent changes and modifications made according to the scope of protection of the present invention shall still fall within the scope covered by this patent. In addition, the technical features, the technical features and the technical invention, and the technical inventions of the present invention can be freely combined and used among each other.

Claims

1. An electron beam ammonia process for flue gas desulfurization and denitrification reaction tower, characterized in that, The electron beam ammonia-based flue gas desulfurization and denitrification reaction tower includes an inner tower and an outer tower sleeved outside the inner tower. Both the inner tower and the outer tower are cylindrical. An annular reaction zone is formed between the outer tower and the inner tower. The top of the outer tower is provided with a tower top, and a flue gas outlet is opened at the bottom of the side wall of the outer tower. A sandwich layer is arranged outside the outer tower, and a plurality of electron accelerators are arranged in the sandwich layer. When the plurality of electron accelerators work, they can emit electron beams into the reaction zone. A flue gas inlet is opened at the bottom of the side wall of the inner tower, and a gas outlet is opened at the top of the inner tower. A spray grid and an ammonia injection grid are sequentially arranged inside the inner tower from bottom to top. The spray grid and the ammonia injection grid divide the inner tower into a cooling spray chamber, an intermediate chamber and an ammonia injection chamber from bottom to top in sequence. A partition is inclinedly arranged in the middle cavity. The partition is provided with a partition opening. The inclination angle formed by the partition and the horizontal direction is 10-30 o , the partition opening is arranged at the higher end of the inclined partition, and the partition opening is arranged at 1 / 6-1 / 4 of the length of the partition, and the size of the partition opening is 15%-35% of the inner diameter of the inner tower.

2. The reaction tower according to claim 1, characterized in that, A plurality of support columns are arranged at the outer top of the inner tower to support the tower top.

3. An electron beam ammonia process for flue gas desulfurization and denitrification device, characterized in that, The electron beam ammonia-based flue gas desulfurization and denitrification device includes a first dust collector, the electron beam ammonia-based flue gas desulfurization and denitrification reaction tower according to claim 1 or 2, a second dust collector and an air preheater. The gas outlet of the first dust collector is connected to the flue gas inlet of the electron beam ammonia-based flue gas desulfurization and denitrification reaction tower through a pipeline. The flue gas outlet of the electron beam ammonia-based flue gas desulfurization and denitrification reaction tower is connected to a chimney through a pipeline via the second dust collector and the air preheater in sequence.

4. The device according to claim 3, characterized in that, The first dust collector includes a bag filter and / or an electrostatic precipitator; the second dust collector is an electrostatic precipitator or an electrostatic bag combined dust collector.

5. An electron beam ammonia process for flue gas desulfurization and denitrification process, characterized in that, The process uses the electron beam ammonia-based flue gas desulfurization and denitrification device according to claim 3 or 4, which includes: (1) The flue gas to be treated enters the first dust collector for dust removal. (2) The dust-removed flue gas enters the electron beam ammonia-based flue gas desulfurization and denitrification reaction tower, and a spray liquid is sprayed in the cooling spray chamber to humidify and cool the flue gas. Subsequently, the flue gas enters the ammonia injection chamber and is fully mixed with ammonia gas in the ammonia injection chamber. (3) The mixed gas obtained in step (2) enters the reaction zone, and in the reaction zone, the mixed gas is irradiated by an electron beam to make the components therein fully react. (4) The flue gas after the reaction in step (3) enters the second dust collector through the flue gas outlet for dust removal to collect reaction by-products. (5) The dust-removed flue gas is preheated by the air preheater and then discharged.

6. The process according to claim 5, characterized in that, In step (2), the humidification and cooling of the flue gas are to make the relative humidity of the flue gas reach 80-100%, and the flue gas temperature is reduced to 47-91°C.

7. The process according to claim 5 or 6, characterized in that, In step (3), the absorbed dose of the electron beam radiation is 3-27 kGy.

8. The process according to claim 5 or 6, characterized in that, In step (5), the preheating is to raise the flue gas temperature to 65-95°C.

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