KR20100136607A - The system for treating of harmful gas - Google Patents

Abstract

PURPOSE: A noxious gas purification system is provided to process the toxic gas through a pulse discharge thereby maximizing the process efficiency after the ionization process of the noxious gas. CONSTITUTION: A fiber electric discharging unit(10) performs the ionization of harmful gas by a metal fiber or a carbon fiber. High voltage is loaded to the metal fiber or the carbon fiber. A pulse electric discharge unit(30) decomposes harmful substance in ionized harmful gas through pulse electric discharge using applied high-voltage nano pulse. An injection unit(20) is installed between the fiber electric discharging unit and the pulse electric discharge unit. The injection unit injects additive for the promotion of decomposition reaction in the implantation of the harmful material.

Description

System for Treating of Harmful gas

The present invention relates to a noxious gas treatment system, and more particularly, ionized gas after ionizing a noxious gas including nitrogen oxide (NOx) and sulfur oxide (SOx) discharged from combustion facilities such as power plants and incinerators. The present invention relates to a noxious gas treatment system capable of removing nitrogen oxides (NOx), sulfur oxides (SOx), etc. by plasma discharge treatment of particles.

In general, in a facility for treating harmful gases including nitrogen oxides and sulfur oxides, which are harmful air pollutants emitted from large-scale incinerators and combustion facilities, nitrogen oxides are treated by Selective Catalytic Reduction (SCR) and sulfuric acid. Cargo is widely commercialized by treating the particulate matter with an electrostatic precipitator and then treating it with Flue Gas Desulfurization (FGD).

However, the selective catalytic reduction method and the flue gas desulfurization method described above have an initial investment cost and an operating cost to be increased as the pollutants contained in the noxious gas are sequentially processed through two processes of denitrification and desulfurization in which a large amount of noxious gas has completely different characteristics. In addition, an optimal process combination of denitrification and desulfurization processes has been required.

Therefore, what is proposed as a method for improving such a problem is a method of simultaneously removing and removing nitrogen oxides and sulfur oxides contained in harmful gases using pulse corona electric discharge.

Here, pulse corona electric discharge is a technique for decomposing nitrogen oxides and sulfur oxides by radicals generated by electric discharge. The desulfurization and denitrification system using pulse electric discharge has a higher reaction rate than conventional wet desulfurization and denitrification processes. Fast and simple process could reduce installation cost by about 40% compared to existing process.

In addition, the passage area air gap of the plasma electric discharge reaction unit is very large and simple process compared to the existing equipment, the pressure loss is very low, and there is an advantage that there is no clogging caused by sludge even during long-term operation, has a high processing efficiency, In addition, there is an advantage that the gas pollutant can be removed within a few seconds of residence time in the reactor.

However, in order to develop pulse electric discharge desulfurization and denitrification process technology, technology for removing harmful substances and decomposition mechanism of harmful gases, including stable plasma discharge formation and maintaining high gas reaction efficiency in a reactor, must be considered. do.

Here, there is a problem in maintaining the high efficiency of the gas reaction by introducing harmful gas directly into the pulse electric discharge reaction unit without a pretreatment process.

Therefore, an object of the present invention is to solve such a conventional problem, by treating the harmful gas flowing through the pulse discharge after the ionization process to achieve a uniform gas reaction to maximize the processing efficiency of harmful gas In providing a processing system.

The above object is, according to the present invention, in the harmful gas treatment system for removing the harmful substances contained in the harmful gas introduced by the pulse discharge, to ionize the harmful gas introduced through the metal fiber or carbon fiber applied high voltage Fiber discharge unit; A pulse discharge unit which decomposes and removes harmful substances contained in the ionized harmful gas through pulse discharge using ionized harmful gas and applied high voltage nano (nano) pulses; And an injection unit installed between the fiber discharge unit and the pulse discharge unit and injecting an additive that promotes a decomposition reaction when the hazardous substances contained in the ionized noxious gas are decomposed in the pulse discharge unit. Achieved by a noxious gas treatment system.

Here, the fiber discharge unit, divided into a plurality of spaces in which harmful gas flows, including a grounded partition wall, the metal fiber or the carbon fiber, is installed in a plurality of spaces divided into ions to generate ions when high voltage is applied It may include a generator and high voltage applying means connected to the ion generator to apply a high voltage to the ion generator.

In addition, the pulse discharge unit, a pulse generator for generating a high voltage nano (nano) pulse, a grounded portion that is grounded on one side, and is installed spaced apart from the ground and connected to the pulse generator to apply a high voltage nano (nano) pulse It may include a discharge portion receiving.

In this case, it is preferable that the ground portion is provided as a hollow tube, and the discharge portion is provided with a wire installed along a central axis of the ground portion.

The injection unit may include a nozzle unit in which the additive is injected, and a mixing unit positioned in the injection direction of the nozzle unit so that the harmful gas ionized by the fiber discharge unit and the additive injected from the nozzle unit are mixed.

In addition, the additive is preferably selected from the group consisting of aliphatic hydrocarbons including NH ₃ , CO, Urea, H ₂ O and CH ₄ , C ₂ H ₄ , C ₃ H ₆ , C ₄ H ₁₀ .

The apparatus may further include an electrostatic precipitator installed at the rear end of the pulse discharge unit to collect the ammonium salt generated in the pulse discharge unit.

According to the present invention, there is provided a noxious gas treatment system capable of maximizing the treatment efficiency by promoting a uniform gas reaction by treating the incoming noxious gas through an ionization process through pulse discharge.

Prior to the description, in various embodiments, components having the same configuration will be representatively described in the first embodiment using the same reference numerals, and in other embodiments, different configurations from the first embodiment will be described. Shall be.

Hereinafter, a noxious gas treatment system according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram of a noxious gas treatment system according to a first embodiment of the present invention. Referring to FIG. 1, the noxious gas treatment system 100 includes a fiber discharge unit 10, an injection unit 20, a pulse discharge unit 30, and an electrostatic precipitator 40.

FIG. 2 is an enlarged view of the metal fiber discharge part of FIG. 1. FIG. 2, the carbon discharge unit 10 includes a first chamber 11, a partition 12, an ion generator 13, and a high voltage applying unit 14.

The partition wall 12 partitions the inner space of the first chamber 11 into a plurality and is installed to be grounded through a predetermined grounding means.

The ion generator 13 is a means for ionizing harmful gas in a gaseous state including NOx and SOx introduced into the first chamber 11 under a high pressure, and a plurality of spaces partitioned by the partition wall 12. It is provided in the inside, respectively, The end of each ion generator 13 is provided with the bundle of fibers 13a. In this case, the fibers 13a may be fine metal fibers or carbon fibers having a diameter of several μm to several tens of μm.

Here, since the ion generator 13 is disposed in each of the spaces partitioned by the partition wall 12, interference may not occur between each other, and harmful gases introduced into the first chamber 11 may be ionized at the same time. This is preferable because it can shorten the time for ionization.

The high voltage applying means 14 is provided outside the first chamber 11 and is connected to apply the high voltage to the ion generator 13.

The fiber discharge unit 10 coupled as described above is a fiber provided at the end of the ion generator 13 when the high pressure applying means 14 applies a high voltage of several kV to several tens of kV, which is a DC voltage, to the ion generator 13 ( 13a) ionizes the gas at the periphery and combines NOx and SOx particles in the harmful gas to ionize NOx and SOx, or particles of NOx and SOx are directly ionized by receiving energy from the fiber 13a.

That is, the particles of the noxious gas including NOx and SOx are transferred to the injection unit 20 which will be described later through the diffusion movement by the ion generator 13 into the inner space respectively partitioned in the fiber discharge unit 10. do.

3 is an enlarged view of the injection unit of FIG. 1. Referring to FIG. 3, the injection unit 20 is installed between the above-described metal fiber discharge unit 10 and the pulse discharge unit 30 to be described later, and includes a second chamber 21, a nozzle unit 22, and a mixing unit. It is comprised including 23.

Here, the nozzle unit 22 is disposed inside the second chamber 21 so that the additive is injected, where the additive promotes decomposition reaction of noxious gas or serves as a reducing agent in the pulse discharge unit 30 to be described later. As a means, at least one may be selected from the group consisting of NH ₃ , CO, Urea, H ₂ O and aliphatic hydrocarbons including CH ₄ , C ₂ H ₄ , C ₃ H ₆ , C ₄ H ₁₀ .

Here, ammonia-based components such as NH ₃ , Urea, hydrocarbon-based components, and H ₂ O may be selected and injected individually, but in order to promote decomposition or reduce radicals in the pulse discharge unit 30 to be described later. At least two or more may be selected and injected in order to improve efficiency. It is shown that NH ₃ gas and HC gas are selectively injected.

In addition, the mixing unit 23 is located in the injection direction of the nozzle unit 22, it is arranged to mix the ionized harmful gas delivered from the carbon discharge unit 10 and the additive injected from the nozzle unit 22, A plurality of mixing plates 23a are disposed in the second chamber 21 to secure a flow path through which ionized harmful gas and additives can be well mixed.

That is, the harmful gas ionized while passing through the flow path formed by the plurality of mixing plates 23a and the additives are mixed and introduced into the pulse discharge unit 30 to be described later, so that the harmful gas ionized in the pulse discharge unit 30 is discharged. It is possible to promote the decomposition reaction.

4 is an enlarged view of the pulse discharge unit and the electrostatic precipitating unit of FIG. 1. Referring to FIG. 4, the pulse discharge unit 30 is introduced with the ionized harmful gas and additives mixed through the injection unit 20, and the third chamber 31, the pulse generator 32, and the ground unit 34. And a discharge unit 33.

The pulse generator 32 is a means for generating a high pressure nano (nano) pulse, is installed on the outside of the third chamber 31 and connected to the discharge unit 33 generated high-pressure nanopulse to the discharge unit 33 Is authorized.

Here, the pulse generator 32 has a pulse rise time of 50 ns to 500 ns, a pulse length (FWHM: frll width half maximum) and a 200 Hz to 2000 Hz dml pulse period of 100 to 1000 ns, and a pulse maximum applied voltage is adjusted to 100 kV. It is desirable to have a specification.

The ground part 33 may be provided as a hollow tube having one side grounded, and a plurality of ground parts 33 may be stacked and disposed inside the third chamber 31.

The discharge part 34 is provided in a long wire shape in one direction, and a plurality of discharge parts 34 are coupled to the coupling bar 34a, and the center of the ground part 33 is installed to be spaced apart from the ground part 33 by a predetermined distance. Each along the axis.

In addition, the coupling bar 34a is connected to the above-described pulse generator 32 so that the high-pressure nanopulse generated from the pulse generator 32 is applied to the discharge part 34 through the coupling bar 34a.

When the high-pressure nanopulse is applied to the pulse discharge unit 30 thus prepared, the introduced ionized noxious gas is in a plasma state through nanopulse discharge, and oxidative radicals such as O, OH, and N, and O ₃ and HO ₂ are generated. NOx and SOx included in the ionized harmful gas introduced therein react as shown in Chemical Formulas 1 to 6.

SO ₂ + O ₂ → SO ₃

SO ₃ + H ₂ O → H ₂ SO ₄

NO ₂ + SO ₂ → H ₂ SO ₄ + NO

2NO + O ₂ → 2NO ₂

2NO ₂ + 2OH → 2HNO ₃

At this time, the hydrocarbon added in the injection unit 20 as an additive reacts with O, OH, N, O ₃ , HO ₂ and the like to generate alkyl, alkoxy, acyl, aldehyde, etc. The radicals thus reacted directly with SOx and NOx or with oxygen, one of the main constituents of noxious gases, produce H ₂ O, which is an oxidative radical.

Therefore, the removal efficiency of SOx and NOx of the noxious gas can be improved by the radicals generated by the hydrocarbon additive.

In addition, in the case of NH3 added as an additive it reacts as in the following formula (6) and (7).

H ₂ SO ₄ + 2 NH ₃ → (NH ₄ ) ₂ SO ₄

NO + NO ₂ + NH ₃ → 2N ₂ + 3H ₂ O

In this way, sulfur oxides are converted to ammonium sulfate, and nitrogen oxides are converted to water vapor and nitrogen, so that SOx and NOx contained in the harmful gas are decomposed and removed.

Next, the electrostatic precipitator 40 is installed at the rear end of the pulse discharge unit 30, is connected to a predetermined high voltage pulse applying means, the ammonium salt such as ammonium sulfate generated in the pulse discharge unit 30 when the high voltage pulse is applied Collect.

That is, SOx and NOx, which are harmful substances contained in the ionized harmful gas, are converted to ammonium sulfate or the like while passing through the pulse discharge unit 30, and such ammonium salt is collected by the electrostatic precipitator 40.

As described above, in the noxious gas treatment system according to the first embodiment of the present invention, ionized gas particles of the noxious gas are further subjected to an ionization process before being introduced into the pulse discharge unit to convert the noxious gas into the plasma. It can be easily radicalized, thereby maximizing the harmful gas treatment efficiency in the pulse discharge unit.

Next, a noxious gas treatment system according to a second embodiment of the present invention will be described. In the second embodiment, the shapes of the discharge part and the ground part of the pulse discharge part 30 are changed in comparison with the first embodiment, and other configurations are the same, so detailed description thereof will be omitted.

5 is a schematic diagram of a pulse discharge unit according to a second embodiment of the present invention. Referring to FIG. 5, the ground part 33 ′ of the pulse discharge part 30 ′ according to the second embodiment is disposed to be spaced apart from the discharge part 34 ′ in a state in which one side is grounded, It is formed in the form of a panel.

In addition, a plurality of discharge parts 34 ′ are provided in the form of long pins in one direction, and a plurality of discharge parts 34 ′ are installed at regular intervals in the coupling bar 34a provided in the third chamber 31.

Here, the coupling bar 34a is connected to the above-described pulse generator 32 so that the discharge part 34 'may be applied with the high voltage from the pulse generator 32.

The discharge part 34 ′ and the ground part 33 ′ may be provided in plural pairs and disposed in the third chamber 31.

When high pressure is applied to the discharge part 34 ′ in this configuration, the ionized noxious gas introduced into the third chamber 31 is changed into a plasma state so that the noxious substances SOx and NOx are removed.

Meanwhile, in the present invention, the first chamber, the second chamber, and the third chamber may be configured as one chamber as shown in FIG. 1, or may be configured as separate independent chambers to form a pipeline through which gases can move. It is also possible to interpose.

The scope of the present invention is not limited to the above-described embodiment, but may be embodied in various forms of embodiments within the scope of the appended claims. Without departing from the gist of the invention claimed in the claims, it is intended that any person skilled in the art to which the present invention pertains falls within the scope of the claims described herein to various extents that can be modified.

1 is a schematic diagram of a noxious gas treatment system according to a first embodiment of the present invention;

2 is an enlarged view of the fiber discharge portion of FIG.

3 is an enlarged view of the injection unit of FIG. 1;

4 is an enlarged view of the pulse discharge unit and the electrostatic precipitator of FIG.

5 is a schematic diagram of a pulse discharge unit of the noxious gas treatment system according to the second embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

Reference Signs List 10 fiber discharge portion 11 first chamber 12 partition wall

13 ion generator 13a carbon fiber

20: injection portion 21: second chamber 22: nozzle portion

23: mixing section 23a: mixing plate

30,30 ': pulse discharge unit 31: third chamber 32: pulse generator

33.33 ': grounding part 34,34': discharge part 34a: coupling bar

40: electrostatic precipitator

Claims (7)

In the noxious gas treatment system for removing harmful substances contained in the noxious gas introduced by pulse discharge, A fiber discharge unit ionizing harmful gas introduced by metal fibers or carbon fibers to which high voltage is applied; A pulse discharge unit which decomposes and removes harmful substances contained in the ionized harmful gas through pulse discharge using ionized harmful gas and applied high voltage nano (nano) pulses; And an injection part installed between the metal fiber discharge part and the pulse discharge part and injecting an additive which promotes a decomposition reaction when the harmful substances contained in the ionized harmful gas are decomposed in the pulse discharge part. Hazardous gas treatment system. The method of claim 1, The fiber discharge unit, Grounded bulkheads and partitioned into a number of spaces where harmful gases enter; An ion generator including the metal fiber or the carbon fiber and installed in a plurality of spaces to generate ions when a high voltage is applied; And a high voltage applying means connected to the ion generator to apply a high voltage to the ion generator. The method of claim 1, The pulse discharge unit may include a pulse generator for generating a high voltage nano pulse, a ground part having one side grounded, and a ground spaced apart from the ground part and connected to the pulse generator to receive a high voltage nano pulse. Toxic gas treatment system comprising a portion. The method of claim 3, wherein The ground portion is provided with a hollow tube, the discharge portion is a harmful gas treatment system, characterized in that provided with a wire provided along the central axis of the ground portion. 5. The method according to any one of claims 1 to 4, The injection unit may include a nozzle unit in which the additive is injected, and a mixing unit positioned in an injection direction of the nozzle unit such that the harmful gas ionized by the fiber discharge unit and the additive injected from the nozzle unit are mixed. Gas treatment system. The method of claim 5, The additive is a harmful gas, characterized in that selected from the group consisting of aliphatic hydrocarbons including NH ₃ , CO, Urea, H ₂ O and CH ₄ , C ₂ H ₄ , C ₃ H ₆ , C ₄ H ₁₀ . Processing system. The method of claim 1, And a electrostatic precipitator installed at a rear end of the pulse discharge unit to collect the ammonium salt generated in the pulse discharge unit.

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