CN204275786U - A kind of flue gas desulfurization and denitrification device - Google Patents

Abstract

The utility model discloses a flue gas desulfurization and denitrification device, which comprises: a flue gas treatment tower, on which a spray system is installed; One flue connection, the flue gas outlet of the flue gas treatment tower is connected to the irradiation reactor through the second flue; and the irradiation reactor, the irradiation reactor is provided with an electron accelerator and an ultraviolet generator; the irradiation reactor is provided with Ammonia injection system. The device of the invention can carry out desulfurization and denitrification reactions simultaneously, simplifies the technological process, and reduces equipment and operation investment. Since the ultraviolet generator is relatively cheap and easy to obtain, adding an ultraviolet generator to the irradiation reactor can further reduce the power requirement of the electron beam generating device, thereby significantly reducing the investment and operating costs of the electron beam generating device.

Description

A flue gas desulfurization and denitrification device

technical field

The utility model relates to the field of flue gas purification, in particular to a device for desulfurization and denitrification by using electron beams and ultraviolet rays to treat flue gas.

Background technique

Environmental pollution caused by air pollution seriously threatens human health. Among them, sulfur dioxide and nitrogen oxides emitted by large industrial facilities, including thermal power plants, cement plants, and waste incineration plants, are one of the main sources of air pollution. Therefore, the problem of flue gas desulfurization and denitrification in factories is an important task in the treatment of environmental pollutants. Various large diesel engines, marine engines, gas turbines, etc. have high NO _x content in the exhaust, and reducing the NO _x concentration in the exhaust of these gas turbines has always been the focus of attention. In addition, thermal power plants, cement plants, waste incineration plants, etc. also emit a large amount of dioxins, especially the dioxins produced by municipal solid waste incineration have received the most attention. Dioxin is very stable, it is difficult to degrade and eliminate naturally in the environment, it is extremely difficult to dissolve in water, and can be dissolved in most organic solvents. . In addition to carcinogenic toxicity, dioxin also has reproductive toxicity and genotoxicity, directly endangering the health and life of future generations. Therefore, dioxin pollution is a major issue related to human survival and must be strictly controlled.

Electron beam irradiation desulfurization and denitrification technology is a coal-fired flue gas purification technology developed in recent years. At present, this technology has entered the stage of industrial application. This technology uses high-energy electron beams to irradiate flue gas containing pollutants such as sulfur dioxide (SO ₂ ) and nitrogen oxides (NO _x ), and generates strong oxidizing free radicals through the ionization and excitation of electron beams. At the same time, under the condition of feeding ammonia gas and water vapor, these free radicals react with SO ₂ and NO _X in the flue gas at an extremely fast speed to form by-products whose main components are ammonium sulfate and ammonium nitrate. The by-products are removed through the by-product collector and dust removal device to obtain purified flue gas.

Fig. 1 is a schematic structural diagram of an existing device for desulfurization and denitrification of flue gas irradiated by electron beams. The process flow of electron beam irradiation flue gas desulfurization and denitrification is as follows: first, the flue gas generated by the coal-fired boiler 1 is sent to the flue gas pretreatment tower 3 through the first flue 2, and the flue gas pretreatment tower 3 is equipped with a nozzle system 4. Cooling water can be sprayed to lower the temperature and humidify the flue gas to the appropriate conditions for the removal reaction, and then send the flue gas through the second flue 5 into the irradiation reactor 7 of the irradiation reaction system. It consists of an irradiation reactor 7 and an electron acceleration system 8, and a certain stoichiometric amount of ammonia is sprayed into the second flue 5 through a flow control valve 6, and then the mixed flue gas enters the irradiation reactor 7 together. Under the action of electron beam irradiation generated by the acceleration system 8, after a series of chemical reactions, sulfur oxides (SO ₂ ) and nitrogen oxides (NO _x ) in the flue gas generate ammonium sulfate and ammonium nitrate, the same as the treated The flue gas enters the by-product collector 9 through the flue together and collects these products through the discharge pipe 10, and uses them as fertilizers. The flue gas treated by the by-product collector 9 is discharged into the atmosphere through the chimney 11.

There is following defective in above-mentioned prior art:

1) During desulfurization and denitrification treatment by electron beam irradiation, in order to achieve a predetermined removal rate, the beam current intensity of the electron beam needs to exceed a certain threshold. The electron beam will lose energy and beam intensity in the process of penetrating the flue gas. Therefore, in the direction of irradiation, the efficiency of flue gas treatment decreases sharply;

2) The flue gas produced by the coal-fired boiler must first be sprayed with water to cool down, and the heat has not been effectively utilized; moreover, desulfurization and denitrification are processed synchronously in the same reactor, which cannot achieve optimal reaction and process conditions for both desulfurization and denitrification ;

3) During the desulfurization and denitrification process using traditional electron beam irradiation, the dioxins produced in the boiler flue gas have not been effectively removed.

In view of this, the utility model provides a desulfurization and denitrification device capable of overcoming the above defects.

Utility model content

In order to solve the above-mentioned problems and defects of the prior art, the utility model provides a flue gas desulfurization and denitrification device, which can significantly improve the utilization efficiency of electron beams in the desulfurization and denitrification process, reduce the operating cost of the desulfurization and denitrification system, and simultaneously Or the dioxins produced in the flue gas of the combustion engine can also be effectively removed.

In order to achieve the above purpose, the utility model provides an electron beam flue gas desulfurization and denitrification device, including:

A flue gas treatment tower, a sprinkler system is installed on the flue gas treatment tower; the flue gas outlet of the boiler or gas turbine is connected with the flue gas inlet of the flue gas treatment tower through a first flue, and the flue gas The flue gas outlet of the treatment tower is connected to the irradiation reactor through the second flue;

An irradiation reactor is provided with an electron accelerator and an ultraviolet generator, and the irradiation reactor is provided with an ammonia injection system.

In a preferred embodiment: the electron accelerator and the ultraviolet generator are respectively arranged on opposite side walls of the irradiation reactor.

In a preferred embodiment: there are a pair of electron accelerators, which are respectively arranged on opposite side walls of the irradiation reactor.

In a preferred embodiment: there are a pair of ultraviolet generators, which are respectively arranged on opposite side walls of the irradiation reactor.

In a preferred embodiment: the ultraviolet wavelength emitted by the ultraviolet generator is 100-400nm.

In a preferred embodiment: the bottom of the irradiation reactor is inclined, and a by-product outlet is provided at the lowest point of the bottom of the reactor.

In a preferred embodiment: the outlet end of the irradiation reactor is connected with a by-product collector.

In a preferred embodiment: the spraying system is an atomized spraying system.

In a preferred embodiment: the spraying system is a water spraying system or a hydrogen peroxide spraying system.

The above-mentioned various flue gas desulfurization and denitrification devices provided by the utility model can be used to treat boiler or gas turbine flue gas. This application can also be used to simultaneously remove SOx, NOx and dioxins from boiler or gas turbine flue gas.

The utility model performs one-step desulfurization and denitrification treatment on flue gas produced by a boiler or a gas turbine respectively through a flue gas treatment tower and an irradiation reactor.

After the flue gas is discharged from the boiler or gas turbine, it is first sprayed with water to reduce the temperature, and then mixed with ammonia gas and then enters the flue gas treatment tower. The amount of ammonia used can be obtained according to the stoichiometric amount. Water is sprayed down from the top of the flue gas treatment tower, and fully contacts and mixes with the mixture of flue gas and ammonia.

The water mist sprayed by the spraying method is more efficient in contact with the mixture of flue gas and ammonia gas, because the droplet size produced by the spray is smaller and the reaction surface area is larger, which is more conducive to the occurrence of chemical reactions. In the above spraying process, changing the sprayed water to hydrogen peroxide solution can significantly improve the removal efficiency of the first desulfurization and denitrification treatment, because hydrogen peroxide can oxidize SOx and NOx into H ₂ SO ₄ and HNO ₃ respectively, Combined with ammonia gas to generate ammonium sulfate and ammonium nitrate to achieve desulfurization and denitrification.

After the flue gas is sprayed with water, the temperature reaches 60-100°C, and then mixed with ammonia gas in the irradiation reactor for desulfurization and denitrification reactions. According to the research mechanism of related desulfurization reactions, the desulfurization reactions mainly rely on thermochemical reactions. The principle of desulfurization reaction is: SOx, O ₂ , H ₂ O in the flue gas react with ammonia to generate ammonium sulfate. In the irradiation reactor, the gas molecules such as N ₂ , O ₂ , H ₂ O and CO ₂ contained in the flue gas are irradiated by electron beams and converted into a large amount of OH, O, HO ₂ , etc. Free radicals, these free radicals react with SOx and NOx in the flue gas at a very fast speed to generate H ₂ SO ₄ and HNO ₃ (see literature: Electron-beam flue-gas treatment for multicomponent air-pollution control, Applied Energy 75 (2003) 145–154). The resulting mist of _H2SO4 and _HNO3 reacts with _NH3 to produce ammonium sulfate and ammonium nitrate in the _form of white powder. The research mechanism of the related denitrification reaction shows that the electron beam irradiation reaction has a greater effect on the denitrification reaction. The main function of ultraviolet rays in the irradiation reactor is: ultraviolet rays can crack O ₂ and H ₂ O to generate OH radicals and O ₃ , thereby reducing the use of electron beams and improving economic efficiency. The reaction mechanism of ultraviolet light is as follows:

H ₂ O+hν→H+·OH

O ₂ +hν→O( ¹ D)+O( ³ P)

O( ¹ D)+M→O( ³ P)+M(M=O ₂ or N ₂ )

O( ³ P)+O ₂ +M→O ₃ +M

O ₃ +hν→O( ¹ D)+O ₂

O( ¹ D)+H ₂ O→2·OH

The technical scheme in the utility model utilizes ultraviolet rays and electron beams to simultaneously irradiate the mixed flue gas, which is not a simple combination. Both electron beam and ultraviolet irradiation can generate many kinds of free radicals, including H, ·OH, H ₂ O ₂ , H ₃ O, HO ₃ , O ₃ and so on. The effects of these free radicals in the oxidation of nitrogen oxides are different. The stronger the oxidizing free radicals are, the better the oxidation effect on sulfur dioxide and nitrogen oxides is, and the more significant the effect on desulfurization and denitrification is. Utilizing ultraviolet rays and electron beams to irradiate the mixed flue gas at the same time has a synergistic effect: ultraviolet rays can further convert free radicals such as H ₂ O ₂ generated by electron beams into ·OH that is beneficial to desulfurization and denitrification. The cost of the ultraviolet irradiation device is much lower than that of the electron accelerator, so that while ensuring the effect of desulfurization and denitrification, the equipment cost and operating cost are effectively reduced.

The strongest oxidizing free radicals such as H ₂ O ₂ and ·OH oxidize NOx and SO ₂ in the gas phase and convert them into solid ammonium nitrate and ammonium sulfate substances. The reaction temperature of desulfurization and denitrification in the irradiation reactor is controlled at 60-110°C, and this temperature range can achieve better SOx and NOx removal rates.

During the above action process, the dioxins in the flue gas are also oxidized and decomposed under the dual effects of electron beams and ultraviolet rays, so as to achieve the technical effect of simultaneously removing dioxins from the flue gas. In addition to the oxidation of dioxin by the above-mentioned hydroxyl radicals, oxygen atoms, ozone, etc., the electron beam can also directly interact with dioxin molecules to convert dioxin molecules into excited state molecules. When the energy of excited state molecules When it is greater than the chemical bond energy, the chemical bond will be broken, and the molecular structure of dioxin will be rearranged or dislocated, and then it will be decomposed and removed. The irradiation of ultraviolet rays can significantly promote the transformation of dioxin molecules into excited states.

The beneficial effects of the utility model are:

The device of the utility model directly reaches the optimum removal temperature of SOx and NOx after the flue gas is sprayed with water, and can carry out desulfurization and denitrification reactions at the same time without providing additional heating, which simplifies the process flow and reduces equipment and run inputs. Since the ultraviolet generator is relatively cheap and easy to obtain, adding an ultraviolet generator to the irradiation reactor can further reduce the power requirement of the electron beam generating device, thereby significantly reducing the investment and operating costs of the electron beam generating device. In addition, the dioxins in the flue gas are also easily decomposed and removed under the dual effects of electron beams and ultraviolet rays in the irradiation reactor. The device of the utility model can be widely used in the treatment of flue gas of various boilers (such as: coal-fired boilers, garbage incineration boilers, chemical waste incineration boilers, etc.) or combustion engines (such as: diesel engines, gas turbines, etc.).

Description of drawings

Fig. 1 is a schematic structural view of an electron beam flue gas desulfurization and denitrification device in the prior art;

Fig. 2 is a schematic structural view of the flue gas desulfurization and denitrification device in Example 1 of the utility model;

Fig. 3 is the schematic diagram of the relative position of the electron accelerator and the ultraviolet generator in the irradiation reactor of the utility model embodiment 1 of the top view angle of view;

Fig. 4 is a schematic structural view of a flue gas desulfurization and denitrification device according to Embodiment 2 of the present utility model;

Fig. 5 is a schematic structural view of a flue gas desulfurization and denitrification device according to Embodiment 3 of the present invention;

Fig. 6 is a schematic diagram of the relative positions of the electron accelerator and the ultraviolet generator in the longitudinal cross-sectional view of the irradiation reactor in Example 3 of the utility model;

Fig. 7 is a schematic structural view of a flue gas desulfurization and denitrification device according to Embodiment 4 of the present utility model.

Detailed ways

Example 1

Referring to Fig. 2, the utility model processes the flue gas through the flue gas treatment tower and the irradiation reactor respectively. The temperature of the flue gas produced by the boiler 1 is 130°C, the content of _SOx in the flue gas is 300ppm, and the content of NOx is 200ppm.

The components and connections of the electron beam flue gas desulfurization and denitrification device shown in Figure 2 are as follows:

The boiler 1 is connected to the flue gas treatment tower 3 through the first flue 2;

A flue gas treatment tower 3, a spray system 4 is installed on the flue gas treatment tower 3; the flue gas outlet of the flue gas treatment tower 3 is connected to the irradiation reactor 7 with the second flue 5; the irradiation reactor 7 An electron accelerator 8 is installed on the top, and an ultraviolet generator 9 is installed on the side wall of the irradiation reactor 7 . The irradiation reactor 7 is provided with an ammonia injection system 6 .

After the flue gas is discharged from the boiler 1, it first enters the flue gas treatment tower 3 through the first flue 2, and the temperature of the flue gas in the flue gas treatment tower 3 is reduced by controlling the sprinkler system 4 to spray water; The aperture controls the atomization of the spray water. The spray water is sprayed down from the top of the flue gas treatment tower 3 through the spray system 4, and fully contacts with the mixture of flue gas and ammonia gas. The mixture of water vapor and flue gas enters the irradiation reactor 7 through the second flue 5 . An ammonia injection system 6 is arranged in the irradiation reactor 7, and the ammonia injection system 6 controls the flow of ammonia gas through an ammonia injection control valve. The amount of ammonia used can be obtained according to the stoichiometric amount.

The water mist sprayed by the atomization spraying method has a higher contact efficiency with the mixture of flue gas and ammonia gas, which is more conducive to the occurrence of chemical reactions. If the water sprayed by the spray system 4 is changed to hydrogen peroxide solution in the above spraying process, the efficiency of the first step of desulfurization and denitration treatment can be significantly improved, because hydrogen peroxide can oxidize SOx and NOx into _H2SO4 and _H2SO4 respectively. HNO ₃ , combined with ammonia gas, produces ammonium sulfate and ammonium nitrate.

Under the condition of using water as the spray agent, the mixed gas composed of SOx, NOx, ammonia, water vapor, and other flue gas components enters the irradiation reactor 7 together with the second flue 5 for simultaneous desulfurization and denitrification treatment. The reaction temperature in irradiation reaction 7 was 60°C. Under the irradiation of the electron beam generated by the electron accelerator 8, NOx and SOx undergo chemical reactions and are removed. While the electron beam is irradiated, the ultraviolet generator 9 (ultraviolet lamp) generates ultraviolet irradiated flue gas, which significantly promotes the transformation of NOx and SOx into ammonium nitrate and ammonium sulfate through electron beam irradiation reaction. The dioxins contained in the flue gas are also decomposed and removed under the double irradiation of electron beams and ultraviolet rays in the irradiation reactor 7 .

The by-products ammonium nitrate and ammonium sulfate are discharged from the bottom 10 of the irradiation reactor 7 and used as fertilizer. The flue gas treated by the irradiation reactor 7 is discharged into the atmosphere through the chimney 11 .

The electron accelerator 8 and the ultraviolet generator 9 can be arranged on the inner wall position close to the irradiation reactor 7, and there are various arrangements and combinations of positions (such as: irradiation in the horizontal direction and/or irradiation in the vertical direction). The gas produces a certain radiation effect. In this embodiment, the electron accelerator 8 and the ultraviolet generator 9 in the irradiation reactor 7 are arranged to irradiate against each other in the horizontal direction (as shown in FIG. 3 ). In this way, the overlapping area of the electron beam and the ultraviolet rays can be increased, which is conducive to more fully irradiating the flue gas. The dose of electron beam is set to 3kGy, the wavelength of ultraviolet light generated by the ultraviolet emitter is 300nm, and the power is 20W, the removal indexes of sulfur dioxide and nitrogen oxide can reach 94% and 79% respectively. If hydrogen peroxide is used as the spray agent in the first step of desulfurization and denitrification treatment, the removal indicators of sulfur dioxide and nitrogen oxides can be further increased to 94% and 82%, respectively. According to the prior art, the removal indicators of sulfur dioxide and nitrogen oxides are only 70% and 42% under the same conditions.

Example 2

Referring to Fig. 4, the utility model processes the flue gas through the flue gas treatment tower and the irradiation reactor respectively. The flue gas temperature produced by boiler 1 is 150°C, the SOx content in the flue gas is 280ppm, and the NOx content is 200ppm.

The components and connections of the flue gas desulfurization and denitrification device shown in Figure 4 are as follows:

The boiler 1 is connected to the flue gas treatment tower 3 through the first flue 2; the flue gas treatment tower 3 is equipped with a spray system 4; the flue gas outlet of the flue gas treatment tower 3 passes through the second The flue 5 is connected to the inlet end of the irradiation reactor 7; the outlet end of the irradiation reactor 7 is connected to the first by-product collector 11; an electron accelerator 8 is installed above the irradiation reactor 7, and the irradiation reactor The ultraviolet generator 9 is installed below the 7, and the electron accelerator 8 is opposite to the ultraviolet generator 9. The irradiation reactor 7 is provided with an ammonia injection system 6, and the injection amount of ammonia gas is controlled through an ammonia injection control valve.

After the flue gas is discharged from the boiler 1, it first enters the flue gas treatment tower 3 through the first flue 2 to reduce the temperature. The temperature in the flue gas treatment tower 3 is controlled at about 80° C. by controlling the spray system 4 ; the atomization effect of the spray water is controlled by controlling the nozzle aperture of the spray system 4 . The spray water sprays down from the top of the flue gas treatment tower 3 through the spray system 4, and fully contacts and mixes with the flue gas. The mixed flue gas enters the irradiation reactor 7 through the second flue 5 . An ammonia injection system 6 is arranged in the irradiation reactor 7, and the ammonia injection system 6 controls the flow of ammonia gas through an ammonia injection control valve. The amount of ammonia used can be obtained according to the stoichiometric amount.

The contact surface area of the water mist sprayed by the atomization spraying method and the flue gas is larger, which is more conducive to the occurrence of chemical reactions. The mixed gas composed of SOx, NOx, ammonia, water vapor, and other flue gas components exits the flue gas treatment tower 5, and then enters the irradiation reactor 7 for simultaneous desulfurization and denitrification treatment. The reaction temperature of flue gas in irradiation reaction 7 is 80°C. Under the irradiation of the electron beam generated by the electron accelerator 8, NOx and SOx undergo chemical reactions and are removed. While the electron beam is irradiated, the ultraviolet generator 9 (ultraviolet lamp) generates ultraviolet irradiated flue gas, which significantly promotes the transformation of NOx and SOx into ammonium nitrate and ammonium sulfate through electron beam irradiation reaction. The dioxins contained in the flue gas are also decomposed and removed under the double irradiation of electron beams and ultraviolet rays in the irradiation reactor 7 .

The by-product collector 10 collects the reaction by-products ammonium nitrate and ammonium sulfate, and discharges them through the bottom 11 of the collector, and the by-products can be used as fertilizers. The flue gas treated by the by-product collector 10 is discharged into the atmosphere through the chimney 12 .

In this embodiment, when the electron beam dose is set to 3kGy, the wavelength of ultraviolet light generated by the ultraviolet emitter is 100nm, and the power is 50W, the removal indexes of sulfur dioxide and nitrogen oxide can reach 88% and 90% respectively. According to the prior art, the removal indicators of sulfur dioxide and nitrogen oxides are only 67% and 21% under the same conditions.

Example 3

Referring to Fig. 5, the utility model processes the flue gas through the flue gas treatment tower and the irradiation reactor respectively. The flue gas temperature produced by boiler 1 is 150°C, the SOx content in the flue gas is 280ppm, and the NOx content is 200ppm.

The components and connections of the flue gas desulfurization and denitrification device shown in Figure 5 are similar to those in Example 2, specifically as follows:

The boiler 1 is connected to the flue gas treatment tower 3 through the first flue 2; the flue gas treatment tower 3 is equipped with a spray system 4; the flue gas outlet of the flue gas treatment tower 3 passes through the second The flue 5 is connected to the inlet port of the irradiation reactor 7 ; the outlet port of the irradiation reactor 7 is connected to the second by-product collector 11 . The irradiation reactor 7 is provided with an ammonia injection system 6 .

There are a pair of ultraviolet generators in the irradiation reactor 7, which are respectively arranged on the opposite side walls of the irradiation reactor 7 (only one ultraviolet generator 91 is marked in FIG. 5 ). The electron accelerators 81 and 82 installed on the irradiation reactor 7 are a pair, which are respectively arranged on the opposite side walls of the irradiation reactor 7 . Fig. 6 is the longitudinal sectional schematic view of irradiation reactor 7 in the present embodiment, and electron accelerator 81 and 82 are oppositely installed on the vertical direction of irradiation reactor 7, and ultraviolet generator 91 and 92 are oppositely installed in irradiation reactor 7 in the horizontal direction. The above-mentioned design can make the distribution of electron beam and ultraviolet rays in the irradiation reactor more uniform, realize the uniform distribution of the beam intensity of the electron beam and the absorbed energy of the electron beam in the flue gas in the space of the irradiation area, and effectively Avoid areas in the irradiation reactor that are difficult to react adequately.

After the flue gas is discharged from the boiler 1, it first enters the flue gas treatment tower 3 through the first flue 2 to reduce the temperature. The temperature in the flue gas treatment tower 3 reaches about 100° C. by controlling the spray system 4 ; the atomization effect of the spray water is controlled by controlling the nozzle aperture of the spray system 4 . The spray water sprays down from the top of the flue gas treatment tower 3 through the spray system 4, and fully contacts and mixes with the flue gas. The mixed flue gas enters the irradiation reactor 7 through the second flue 5 . The irradiation reactor 7 is provided with an ammonia injection system 6, and the ammonia injection system 6 controls the flow of ammonia gas through an ammonia injection control valve. The amount of ammonia used can be obtained according to the stoichiometric amount.

The contact surface area of the water mist sprayed by the atomization spraying method and the flue gas is larger, which is more conducive to the occurrence of chemical reactions. The mixed gas composed of SOx, NOx, ammonia, water vapor, and other flue gas components exits the flue gas treatment tower 3, and then enters the irradiation reactor 7 for simultaneous desulfurization and denitrification treatment. The reaction temperature of the flue gas mixture in the irradiation reaction 7 is 100°C. In this embodiment, the flue gas is irradiated simultaneously by electron beams and ultraviolet rays in the irradiation reactor 7 . Ultraviolet radiation is the relative irradiation of two beams of ultraviolet rays, and electron beam irradiation is the relative irradiation of two beams of electron beams. Under the irradiation of the electron beams generated by the electron accelerators 81 and 82, NOx and SOx undergo chemical reactions and are removed synchronously. While the electron beam is irradiating, the ultraviolet generators 91 and 92 generate ultraviolet irradiating flue gas, which significantly promotes the transformation of NOx and SOx into ammonium nitrate and ammonium sulfate through electron beam irradiation reaction. The dioxins contained in the flue gas are also decomposed and removed under the double irradiation of electron beams and ultraviolet rays in the irradiation reactor 7 . The removal efficiencies of NOx, SOx and dioxins are all improved due to the elimination of reaction dead angles.

The by-product collector 10 collects the reaction by-products ammonium nitrate and ammonium sulfate, and discharges them through the bottom 11 of the collector, and the by-products can be used as fertilizers. The flue gas treated by the by-product collector 10 is discharged into the atmosphere through the chimney 12 .

In this embodiment, when the electron beam dose is set to 3kGy, the wavelength of ultraviolet light generated by the ultraviolet emitter is 400nm, the power is 40W, and the removal indexes of sulfur dioxide and nitrogen oxide can reach 90% and 92% respectively. According to the prior art, the removal indicators of sulfur dioxide and nitrogen oxides are only 67% and 21% under the same conditions.

Example 4

Referring to Fig. 7, the utility model processes the flue gas through the flue gas treatment tower and the irradiation reactor respectively. The temperature of the flue gas produced by the gas turbine 1 burning natural gas is 350° C., and the NOx content in the flue gas is 180 ppm.

The components and connections of the flue gas desulfurization and denitrification device shown in Figure 7 are similar to those in Example 2, specifically as follows:

The gas turbine 1 burning natural gas is connected to the flue gas treatment tower 3 through the first flue 2; the flue gas treatment tower 3 is equipped with a spray system 4; the flue gas outlet of the flue gas treatment tower 3 The inlet end of the irradiation reactor 7 is connected through the second flue 5; the ammonia injection system 6 is arranged in the irradiation reactor 7; the outlet end of the irradiation reactor 7 is connected with the first by-product collector 11.

There are a pair of ultraviolet generators in the irradiation reactor 7, which are respectively arranged on the opposite side walls of the irradiation reactor 7 (only one ultraviolet generator 91 is marked in FIG. 7 ). The electron accelerators 81 and 82 installed on the irradiation reactor 7 are a pair, which are respectively arranged on the opposite side walls of the irradiation reactor 7 .

After the flue gas is discharged from the gas turbine 1 burning natural gas, it first enters the flue gas treatment tower 3 through the first flue 2 to reduce the temperature. The temperature in the flue gas treatment tower 3 reaches about 110° C. by controlling the spray system 4 ; the atomization effect of the spray water is controlled by controlling the nozzle aperture of the spray system 4 . The spray water sprays down from the top of the flue gas treatment tower 3 through the spray system 4, and fully contacts and mixes with the flue gas. The mixed flue gas enters the irradiation reactor 7 through the second flue 5, and mixes and reacts with the ammonia gas passing through the ammonia injection system 6 to control the flow rate. The amount of ammonia used can be obtained according to the stoichiometric amount.

The contact surface area of the water mist sprayed by the atomization spraying method and the flue gas is larger, which is more conducive to the occurrence of chemical reactions. The mixed gas composed of NOx, ammonia, water vapor, and other flue gas components exits the flue gas treatment tower 3, and then enters the irradiation reactor 7 for simultaneous denitrification treatment. The reaction temperature of the flue gas mixture in the irradiation reaction 7 is 110°C. In this embodiment, the flue gas is irradiated simultaneously by electron beams and ultraviolet rays in the irradiation reactor 7 . Ultraviolet radiation is the relative irradiation of two beams of ultraviolet rays, and electron beam irradiation is the relative irradiation of two beams of electron beams. Under the irradiation of the electron beams generated by the electron accelerators 81 and 82, NOx undergoes a chemical reaction and is removed. While the electron beam is irradiating, the ultraviolet generators 91 and 92 generate ultraviolet irradiating flue gas, which significantly promotes the transformation of NOx into ammonium nitrate through the electron beam irradiation reaction.

The by-product collector 10 collects the reaction by-product ammonium nitrate and discharges it through the bottom 11 of the collector. The by-product can be used as fertilizer. The flue gas treated by the by-product collector 10 is discharged into the atmosphere through the chimney 12 .

In this embodiment, when the electron beam dose is set at 3 kGy, the wavelength of ultraviolet light generated by the ultraviolet emitter is 200 nm, the power is 40 W, and the nitrogen oxide removal index can reach 92%. According to the prior art, the removal index of nitrogen oxides under the same conditions is only 28%.

The foregoing description, for purposes of illustration, has been presented with reference to specific embodiments. However, the above exemplary discussions are not intended to be exhaustive to limit the invention to the precise forms disclosed. Many modifications and variations are possible in light of the above teachings. These embodiments were chosen and described in order to better explain the principles of the invention and its practical application, thereby enabling others skilled in the art to best utilize the invention and various embodiments as are suited to the specific use contemplated. Embodiment and various modifications.

Claims (9)

1. A flue gas desulfurization and denitrification device, characterized in that it comprises: A flue gas treatment tower, a sprinkler system is installed on the flue gas treatment tower; the flue gas outlet of the boiler or gas turbine is connected with the flue gas inlet of the flue gas treatment tower through a first flue, and the flue gas The flue gas outlet of the treatment tower is connected to the irradiation reactor through the second flue; An irradiation reactor, the irradiation reactor is provided with an electron accelerator and an ultraviolet generator; the irradiation reactor is provided with an ammonia injection system. 2. The flue gas desulfurization and denitrification device according to claim 1, characterized in that: the electron accelerator and the ultraviolet generator are respectively arranged on opposite side walls of the irradiation reactor. 3. A flue gas desulfurization and denitrification device according to claim 1, characterized in that: said electron accelerators are a pair, respectively arranged on opposite side walls of said irradiation reactor. 4. A flue gas desulfurization and denitrification device according to claim 1, characterized in that: said ultraviolet generators are a pair, which are respectively arranged on opposite side walls of said irradiation reactor. 5. A flue gas desulfurization and denitrification device according to claim 4, characterized in that: the wavelength of ultraviolet light emitted by the ultraviolet generator is 100-400nm. 6. The flue gas desulfurization and denitrification device according to any one of claims 1 to 5, characterized in that: the bottom of the irradiation reactor is inclined, and a by-product outlet is provided at the lowest point of the reactor bottom. 7. The flue gas desulfurization and denitrification device according to any one of claims 1 to 5, characterized in that: the outlet end of the irradiation reactor is connected to a by-product collector. 8. The flue gas desulfurization and denitrification device according to any one of claims 1 to 5, wherein the spray system is an atomization spray system. 9. A flue gas desulfurization and denitrification device according to claim 8, characterized in that: the spraying system is a water spraying system or a hydrogen peroxide spraying system.