KR101677902B1 - How to remove the acid gas removal system of the incinerator using the singing voice soda - Google Patents

Abstract

The present invention relates to a device and method for removing acid gas of an incinerator using caustic soda water. More specifically, caustic soda water is made by simply mixing powdered caustic soda in a field of an incineration plant, and is sprayed on a connection duct of an incineration installation along with compressed air so as to remove acid exhaust gas by neutralization. Accordingly, the device for removing acid gas of an incinerator using caustic soda water may easily and simply be installed in the incineration plant using a simple mixing system. In addition, compressed air and caustic soda water are mixed and sprayed in a particle form, and are evaporated after neutralizing acid exhaust gas. Thus, second treatment is unnecessary. Also, clinkers or attached foreign materials are not generated inside the connection duct.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an incinerator for removing acid gas from an incinerator using caustic soda,

The present invention relates to an apparatus for removing acidic gases from incinerators using caustic soda, and more particularly to a method and apparatus for removing acidic gases from incinerators, which comprises mixing powdered caustic soda with water in an incinerator site to produce caustic soda water, To neutralize and remove the acidic exhaust gas. It can be easily and simply installed in the incinerator by using simple mixing equipment. It is mixed with compressed air and caustic soda water and is sprayed in the form of particles to neutralize acidic exhaust gas, And an acid gas removing apparatus and a removing method of a new type incinerator in which no cleaner or adhering foreign matter is generated in the connecting duct.

In general, waste gases from incinerators that are incinerated by nitrogen, sulfur, chlorine, and organic matter contained in waste materials include SOx, Cl2, HCl, CO), carbon dioxide (CO2), dust, dioxins, etc., and chlorinated organic substances, volatile organic substances, and the like.

These harmful substances are not only harmful substances that directly affect the human body but also environmental pollutants that cause urban smog and acid rain. Therefore, in order to protect the public health and the environment, these substances should be removed from the incinerator exhaust gas and then discharged to the atmosphere do. Therefore, the emission concentrations of these harmful substances are regulated by law.

Methods for controlling SOx, Cl2, HCl, and NOx, which are acidic exhaust gases generated from the incinerator exhaust gas, are largely divided into dry and wet processes.

The dry method is a method of introducing chemicals into the air avoidance facility in the absence of water and is mostly a method of introducing powdered calcium hydroxide (Ca (OH) ₂), and the wet control method is to use liquid caustic soda (NaOH) This is a method of spraying the liquid from top to bottom in the filling tower and controlling it by contacting with the atmospheric discharge gas moving from the bottom to the top.

Among the dry cleaning method and the wet cleaning method described above, the wet cleaning method has a high removal efficiency of acid gas, but the wastewater generated after the reaction is a secondary contamination material, which causes a problem of water quality treatment.

In order to solve the problem of the wastewater generated by the wet cleaning method as described above, the incineration incinerator, which can be reused, is disclosed in Patent Registration No. 10-0635466 (registered on October 11, 2006)

1. A waste incineration apparatus comprising an incinerator, a boiler, a semi-automatic dust collector, a bag filter and a wet dust collector,

A dust collector circulating means is installed in the wet dust collector so as to circulate the dust collecting water filled in the dust collecting water storage space of the wet dust collector to the semi-dry dust collector;

And a neutralization means for neutralizing water, which is capable of supplying caustic soda (NaOH), which is a neutralizing liquid, to the collection water storage space of the wet dust collector and the collection water circulation means.

In addition, according to another conventional technique, a semi-perspiration reaction tower for combustion gas treatment in an incinerator of Patent Registration No. 10-1326597 (registered on November 10, 2013)

A body 1 constituting a semi-dry type reaction column,

A gas inlet duct (2) is formed outside the upper center of the body (1)

A gas partition plate 3 for dividing an acidic gas is fixedly installed inside the body 1 below the gas inlet duct 2,

In the gas partition plate 3, gas flow ducts 4 are vertically divided into a plurality of gas flow ducts 4,

A support plate (5) is installed at the lower end of the gas flow duct (4)

The gas flow duct 4 is divided into a plurality of gas flow ducts 4, and a nozzle 6 is inserted into the gas flow duct 4 to a predetermined depth.

However, since both the dry cleaning method and the wet cleaning method require installation of an air pollution prevention facility separately from the incineration facility, there is a problem in that the installation is complicated and the installation cost is increased due to restriction of space or installation of the facility.

Further, in the case of the wet cleaning method, the wastewater can not be completely treated, thereby requiring a separate facility for wastewater treatment.

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method and apparatus for producing sodium hydroxide by mixing sodium hydroxide with water in an incinerator site to produce caustic soda water, (SOx), chlorine gas (Cl2), hydrogen chloride (HCl) and nitrogen oxides (NOx), which are acidic exhaust gases, are injected into the connecting duct of the exhaust gas generated after the injection The present invention also provides an acid gas removing apparatus and a removing method that can prevent the occurrence of a cleaner or adhering foreign matter due to particles sprayed into a duct after neutralization is removed, It can be installed in a simple structure with the basic structure of the feed pump, the feed pipe and the injection nozzle, The present invention provides a new type of incinerator as well as an apparatus for removing acid gas from the incinerator.

It is an object of the present invention to provide an exhaust gas treatment device for an incinerator including a duct for introducing exhaust gas generated by a combustion reaction of municipal waste, workplace waste or other combustible material into an exhaust gas treatment facility in an incinerator,

A mixing tank and a storage tank installed at the incinerator site where the processing device is formed and having an agitator and an air supply pipe formed therein for mixing powdered caustic soda (NaOH) and water;

A spray nozzle having one side inserted into the duct and the other side exposed to the outside to connect the compressed air supply hose and the transfer pipe;

A transfer pipe connecting the mixing tank and the reservoir to the spray nozzle to supply the caustic soda water to the spray nozzle side;

And a transfer pump installed on the line of the transfer pipe for forcibly moving the caustic soda water from the mixing tank and the reservoir to the spray nozzle side. The apparatus for removing acid gas of incinerator using caustic soda water according to claim 1,

The transport pump is characterized in that the operation is automatically or manually controlled through the control unit according to the concentration of sulfur oxides (SOx), chlorine gas (Cl2), and hydrogen chloride (HCl) in the exhaust gas discharged after incineration.

In order to remove sulfuric acid (SOx), chlorine gas (Cl₂) and hydrogen chloride gas (HCl) from the exhaust gas after incineration, caustic soda (NaOH ) And water to prepare and store caustic soda water in a mixing tank and a storage tank;

And a spraying step of spraying the stored caustic soda water through the transfer pipe from the rear end of the incineration facility to the filter cloth dust collector or the spray nozzle formed in the duct at the front end of the electrostatic precipitator so as to spray the caustic soda water into the duct together with the compressed air in the form of fine particles ,

And is characterized in that caustic soda water injected in the form of fine particles is reacted with acid gas of sulfur oxide, chlorine, and hydrogen chloride to neutralize and evaporate and be removed.

A plurality of caustic water flowing from the mixing tank or storage tank to the spray nozzle through the transfer pipe is installed in the transfer pipe line in the course of the movement, and sulfur oxides (SOx), chlorine gas (Cl₂), hydrogen chloride (HCl) The injection amount of the caustic soda water injected into the duct is controlled by the transfer pump, the operation of which is controlled automatically or manually through the control unit according to the concentration of the soda water.

As described above, the apparatus and method for removing acidic gases in an incinerator according to the present invention are simple in structure and easy to operate, and are easy to apply to existing incineration facilities and have a low installation cost.

In the apparatus for removing acid gases from an incinerator according to the present invention, the concentration of sulfur oxides (SOx), chlorine gas (Cl2), hydrogen chloride (HCl), and nitrogen oxides (NOx) Control system Tele Motering System), the concentration of acidic exhaust gas can be controlled by increasing or decreasing the amount of caustic soda water automatically and manually after detecting the concentration in the incinerator central control room.

In addition, the distribution cost of chemicals that control acidic exhaust gas in the incineration facilities in the mountains is high, and the cost of purchasing chemicals is high when not purchased in large quantities. It is possible to carry small quantity of powder caustic soda (NaOH) in 20kg bag in the mountains and it is easy to store in the field, and it can be used as caustic soda as desired, so it is convenient to use and manage.

In addition, in the incinerator duct, caustic soda water is mixed with acid gas and turbulent mixing to neutralize the acid gas. After the reaction, caustic soda water in the form of particles is evaporated and removed to eliminate the generation of wastewater. And it is desorbed from the electric dust collector and discharged as fly ash.

1 is a schematic view showing the flow of an acid gas removing apparatus of an incinerator using caustic soda water according to the present invention
FIG. 2 is a photograph of a mixing tank and a supply pump portion of an acid gas removing device of an incinerator using caustic soda water according to the present invention.
FIG. 3 is a photograph of a state in which a spray nozzle is installed in a duct in an apparatus for removing acidic gases from an incinerator using caustic soda water according to the present invention
4 is an enlarged view of an essential part of the apparatus for removing acid gas from an incinerator using caustic soda water according to the present invention

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

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. It does not mean anything.

In addition, the size and shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation, and the terms specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user, operator It should be noted that the definitions of these terms should be made on the basis of the contents throughout this specification.

FIG. 1 is a schematic view showing a flow of an acid gas removing apparatus for an incinerator using caustic soda water according to the present invention. FIG. 3 is a photograph showing a state in which a spray nozzle is installed in a duct in an apparatus for removing acidic gas from an incinerator using caustic soda water according to the present invention, and FIG. 4 is a photograph of the acid gas Fig.

As shown in the drawings, the apparatus 100 for removing acidic gases from an incinerator using caustic soda according to the present invention comprises a mixing tank / storage tank 10 for liquefying powdered caustic soda, a plurality of (20), a transfer pipe (30) for connecting the reservoir (10) and the spray nozzle (20), and a siphon soda of the reservoir (10) formed on the transfer pipe (30) And a feed pump 40 for adjusting the injection quantity of the caustic soda water injected through the injection nozzle 20. [

The mixed tank and storage tank 10 is a structure for producing caustic soda water by mixing powdered caustic soda (NaOH) with water at an incinerator site, and has a circular or square water tank form. The mixing tank 11 and the external An air supply pipe 12 through which the aeration air flows is formed through the air supply line for the aeration, and the inflow water and the powder caustic soda are mixed smoothly, and the discharge pipe 13 is formed at the lower part.

A plurality of the injection nozzles 20 are installed in the duct 200 at the front end of the filter and the dust collector (not shown) or the electrostatic precipitator (not shown). One end of the injection nozzle 20 is inserted into the duct 200, The transfer pipe 30 and the compressed air supply hose 21 are fastened to each other while being exposed to the outside of the duct 200.

The transfer piping 30 connects the discharge pipe 13 of the mixing tank 10 and the spray nozzle 20 to move the caustic soda water from the mixing tank 10 to the spray nozzle 20 side, 30, a plurality of valves and a controller are provided to control the movement and supply amount of the caustic soda water.

The transfer pump 40 is installed on a line of the transfer pipe 30 and is connected to a temperature sensor (not shown) formed in the duct 200 and a caustic soda The operation amount is controlled according to the injection amount, the injection time, and the like.

That is, when the concentration of sulfur oxides (SOx), chlorine gas (Cl2), hydrogen chloride (HCl), and nitrogen oxides (NOx) in the exhaust gas discharged after incineration is high in the duct TMS (chimney remote control system Tele Motering System) The concentration of the acidic exhaust gas can be adjusted by increasing or decreasing the input amount of the caustic soda water by operating the transfer pump 40 automatically or manually.

The acidic gas removal method using the acidic gas removing device of the incinerator using the caustic soda water according to the present invention will be described in detail as follows.

First, powdered caustic soda (NaOH) and water are charged into the mixing tank and storage tank 10 at a predetermined ratio, and the air is supplied through an air supply pipe 12 through which the aeration air flows through the agitator 11 and the air supply line for external aeration And mixed to produce caustic soda water.

The caustic soda water produced as described above is transferred to the spray nozzle 20 formed in the duct 200 through the transfer pipe 30 and transferred to the temperature sensor (not shown) formed in the duct 200 and the controller (not shown) The feed pump 40 operates to spray the caustic soda into the duct through the injection nozzle 20.

The above-mentioned caustic soda water is injected into the duct in the form of fine particles to remove acidic gases such as sulfur oxides, chlorine, and hydrogen chloride.

That is, sulfur oxides (SOx) are treated by injecting caustic soda (NaOH) into the duct 200 to absorb and evaporate SO 2 in the gas.

The reaction is as follows.

2NaOH + SO2-> Na2SO3 + H2O

Na₂SO₃ + ½O₂ → Na₂SO₄

The above sulfur oxides (SOx) are sprayed in the form of particles of NaOH to treat them, so that the absorption rate of sulfur oxides is fast, there is no formation of corrosion and scale, and a high desulfurization rate of 90% .

In addition, treatment of chlorine and hydrogen chloride can also be carried out by spraying caustic soda (NaOH) into the duct 200 and alkali absorption method and complex absorption method using ferrous sulfate (FeSO4).

It is used when the amount of exhaust gas is large and the chlorine concentration is low.

The reaction is as follows.

Cl₂ + Ca (OH) ₂ → CaOCl₂ + H₂O

Cl₂ + 2NaOH → NaCl + NaOCl + H2O

2HCl + Ca (OH) 2) - > CaCl2 + 2H2O

2HCl + 2NaOH - > 2NaCl + 2H2O

Acid absorption by ferrous sulfate: This is a method of reacting ferrous sulfate with chlorine to form a complex salt (FeClSO4) with high chemical stability.

Cl₂ + 2FeSO₄ → 2FeClSO₄

In the method of removing acid gas of incinerator using the caustic soda water of the present invention as described above, it is the main chemical reaction that caustic soda water is mixed with acidic gas and turbulent mixing in an incinerator duct to neutralize the acid gas. There is no wastewater generated after the reaction, Salts are desorbed from the filtration and dust collecting facilities and discharged as fly ash.

The main reactions are as follows.

2NaOH + SO2-> Na2SO3 + H2O

2HCl + 2NaOH - > 2NaCl + 2H2O

Cl₂ + 2NaOH → NaCl + NaOCl + H2O

In addition, the present invention is applicable to existing incineration facilities, has a simple facility, easy operation and low installation cost, and the chemical that controls acidic exhaust gas in an incineration facility in the mountains is powdered caustic soda NaOH) can be transported in a small capacity with a 20kg bag, so that the distribution cost can be remarkably reduced, and if necessary, it can be dissolved into caustic soda water as needed, thereby facilitating the management of chemicals.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention, It is obvious that the claims fall within the scope of the claims.

10: Mixing tank and storage tank 11: Stirrer
12: Air supply pipe 13:
20: injection nozzle 21: compressed air supply hose
30: transfer pipe 40: transfer pump
200: Duct

Claims (4)

1. An exhaust gas treating apparatus for an incinerator including a duct for introducing exhaust gas generated by a combustion reaction of municipal solid waste, workplace waste or other combustible material into an exhaust gas treatment facility in an incinerator,
A mixing tank and a storage tank installed at a site of the incinerator where the treatment device is formed and having an agitator and an air supply pipe for mixing powdered caustic soda (NaOH) and water and a discharge pipe at a lower part thereof;
One end of the duct 200 is inserted into the duct 200 and a plurality of ducts 200 are provided in the duct 200 at the front end of the filter and the dust collector (not shown) or the electrostatic precipitator (not shown) from the rear end of the incinerator. An injection nozzle exposed to the outside of the injection nozzle 200 and connected to the compressed air supply hose and the transfer pipe;
A transfer pipe connected to the discharge pipe of the mixed tank and storage tank and the spray nozzle to supply the caustic soda water to the spray nozzle side and having a plurality of valves and a controller on the line;
The mixed soda water is automatically or manually supplied to the mixing tank or the storage tank through the control unit in accordance with the concentration of sulfur oxides (SOx), chlorine gas (Cl 2) and hydrogen chloride (HCl) And a feed pump for forcibly moving the sludge from the injection nozzle toward the injection nozzle.
delete A method for removing an acid gas in an incinerator using the incinerator acid gas removing device of claim 1,
In order to remove sulfur oxides (SOx), chlorine gas (Cl₂) and hydrogen chloride gas (HCl) from the exhaust gas after incineration, powdered caustic soda (NaOH) and water are mixed at the site of the incinerator to produce caustic soda water A storage step of storing the data in a storage tank,
The stored caustic soda water is transferred from the rear end of the incineration facility to the spray nozzle formed in the duct at the front of the filter dust collector or the electrostatic precipitator through the transfer pipe connected to the outlet pipe of the mixing tank and the reservoir to collect the caustic soda water into the duct together with the compressed air And a spraying step of spraying the sprayed mixture
And is neutralized, evaporated and removed by reacting with caustic soda water sprayed in the form of fine particles inside the duct and acid gas of sulfur oxide, chlorine, and hydrogen chloride,
A plurality of caustic water flowing from the mixing tank or storage tank to the spray nozzle through the transfer pipe is installed in the transfer pipe line in the course of the movement, and sulfur oxides (SOx), chlorine gas (Cl₂), hydrogen chloride (HCl) Wherein the injection amount of the caustic soda water injected into the duct is controlled by a transfer pump whose operation is automatically or manually controlled through a control unit according to the concentration of the caustic soda. delete

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