JPH0713423U - Electron beam exhaust gas treatment device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an electron beam exhaust gas treatment device capable of efficiently irradiating an electron beam. [Structure] The container 20 through which the exhaust gas passes has its exhaust gas flow 26
The electron beam source 24 for irradiating the electron beam 25 in the direction of is attached.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electron beam exhaust gas treatment apparatus for irradiating an exhaust gas with an electron beam in order to remove harmful substances in the exhaust gas.

[0002]

[Prior art]

 A process flow diagram for flue gas treatment at a coal-fired power plant will be described with reference to FIG.

Exhaust gas from the boiler 1 is heat-exchanged by an air / gas heater 2 and then supplied to a dust collector 3 at a temperature of 150 ° C., where fly ash in the exhaust gas is roughly removed and water is sprayed in a cooling tower 4. Is cooled to 70 ° C. After this, a small amount of ammonia 5 or the like determined by the SO2 and NOx concentrations is blown into the exhaust gas and enters the reactor 6, where it is irradiated with a high-speed electron beam from an electron beam irradiation device 7. In the reactor 6, S O2 and NOx are rapidly oxidized into intermediate products such as sulfuric acid and nitric acid. These further react with the coexisting ammonia to form a powdery ammonium salt (a mixture of ammonium sulfate and ammonium sulfate). These powder particles are separated and collected by the dust collector 8 and supplied to the by-product processing facility 9, and the gas is discharged from the chimney 10 to the atmosphere.

As a mechanism of desulfurization / denitration, electron beam irradiation causes the main components of exhaust gas, such as nitrogen, oxygen, and water, to undergo radiolysis to generate OH, O, H 2 O, and N radicals. It rapidly reacts with the nitrous acid gas and nitrogen oxides in the product, converts them into nitric acid and sulfuric acid, and the nitric acid and sulfuric acid produced react with the ammonia added to the exhaust gas to form powdered ammonium sulfate and sulfuric acid. It will be Shirasu.

[0005]

[Problems to be solved by the device]

 By the way, in an electron beam exhaust gas treatment apparatus for irradiating an exhaust gas with an electron beam, a connection flange 12 is attached to a container 11 and an electron beam source 13 is attached to the flange as shown in FIG. Thus, the electron beam 15 is irradiated.

However, when the electron beam 15 is irradiated so as to be orthogonal to the exhaust gas flow 14, there is a problem that the exhaust gas is not sufficiently irradiated with the electron beam 15 and radicals necessary for the reaction cannot be obtained. Further, if the energy of the electron beam source 13 is increased to improve the irradiation, there is a problem that the electron beam goes out of the container and the efficiency deteriorates.

Therefore, an object of the present invention is to solve the above problems and to provide an electron beam exhaust gas treatment apparatus capable of efficiently irradiating an electron beam.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a container through which exhaust gas passes, with an electron beam source for irradiating an electron beam in the direction of the exhaust gas flow.

[0009]

[Action]

 According to the above configuration, by irradiating the electron beam in the flow direction of the exhaust gas, the contact between the electron and the gas becomes good, and the irradiation can be performed efficiently.

[0010]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 20 denotes a container such as a reactor, which is formed by being bent into an L-shape, and a connecting flange is formed so that its bent portion 21 substantially coincides with the axis of the straight portion 22 on the exhaust gas introduction side. 23 is provided, and the electron beam source 24 is connected to the connecting flange 23.

The exhaust gas introduced into the container 20 is discharged from the boiler as described with reference to FIG. 2, the fly ash is removed, the temperature is lowered to 70 ° C., and the ammonia gas is blown into the exhaust gas. Is.

Next, the operation of the embodiment will be described.

Exhaust gas flowing through the straight portion 22 of the container 20 flows in as shown by an arrow 26 in the figure, changes its direction at the bent portion 21 as shown by an arrow 27 in the figure, and flows downstream. Since the electron beam 25 emitted from the electron beam source 24 is irradiated in the direction of the exhaust gas flow, the contact time with the gas becomes long, and the OH, O, H2 O, N radicals are well generated. These radicals rapidly react with nitrite gas and nitrogen oxides in the exhaust gas and convert them into nitric acid and sulfuric acid. The generated nitric acid and sulfuric acid react with the ammonia added to the exhaust gas to form powdered ammonium sulfate and ammonium sulfate, which are separated and collected from the exhaust gas.

In the above-mentioned embodiment, the electron beam is irradiated so as to flow countercurrently with the exhaust gas, but it may be irradiated so as to flow in parallel.

Further, the exhaust gas in which lime nitrate or the like is blown in addition to ammonia may be irradiated with an electron beam. In this case, calcium sulfate, calcium nitrate, etc. will be separated and recovered from the exhaust gas.

[0017]

[Effect of device]

 In short, according to the present invention, by irradiating the electron beam in the direction of the exhaust gas, the contact between the electron and the gas becomes good, and efficient irradiation can be performed.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an exhaust gas treatment device of a coal-fired power plant.

FIG. 3 is a diagram showing a conventional example.

[Explanation of symbols]

 20 container 24 electron beam source 25 electron beam 26 exhaust gas flow

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B01D 53/34 ZAB

Claims (1)

[Scope of utility model registration request] 1. An electron beam exhaust gas treatment apparatus, wherein an electron beam source for irradiating an electron beam in the direction of the exhaust gas flow is attached to a container through which the exhaust gas passes.