KR20090067659A - Incinerator and method for removing mercury thereof - Google Patents

Incinerator and method for removing mercury thereof Download PDF

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Publication number
KR20090067659A
KR20090067659A KR1020070135397A KR20070135397A KR20090067659A KR 20090067659 A KR20090067659 A KR 20090067659A KR 1020070135397 A KR1020070135397 A KR 1020070135397A KR 20070135397 A KR20070135397 A KR 20070135397A KR 20090067659 A KR20090067659 A KR 20090067659A
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KR
South Korea
Prior art keywords
blast furnace
mercury
furnace slag
incinerator
slag
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Application number
KR1020070135397A
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Korean (ko)
Inventor
김민균
김병억
Original Assignee
재단법인 포항산업과학연구원
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Priority to KR1020070135397A priority Critical patent/KR20090067659A/en
Publication of KR20090067659A publication Critical patent/KR20090067659A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2209/00—Specific waste
    • F23G2209/14—Gaseous waste or fumes

Abstract

An incinerator and a mercury removal method of an incinerator are provided to recycle resources and to improve air quality, and to remove other gaseous harmful metal compounds as well as mercury by using quenched blast furnace slag, a byproduct from iron manufacture, to remove mercury, thereby recycling blast furnace slag and heightening the value simultaneously, and to have high mercury removal efficiency similar to active carbon, to have excellent economical efficiency and not to cause the problem of secondary pollution. An incinerator using quenched blast furnace slag comprises desulfurization equipment(12) dealing with the gas discharged from a boiler(11), a blast furnace slag powder spray device(13) spraying quenched blast furnace slag powder to gas containing gaseous mercury discharged from the desulfurization equipment to make the quenched blast furnace slag powder absorb mercury, and a filter dust collector(14) filtering out the quenched blast furnace slag absorbing the mercury.

Description

Incinerators and methods for removing mercury from incinerators {INCINERATOR AND METHOD FOR REMOVING MERCURY THEREOF}

The present invention relates to a method for removing mercury in incinerators and incinerators, and more particularly, to a method for removing mercury in incinerators and incinerators using blast furnace slag.

Mercury is now widely used throughout the industry, and numerous studies have been conducted on mercury's human risks. However, the mercury has been sufficiently proved, but the use of alternative materials is extremely limited, and is still widely used. Mercury is emitted the most in the natural world such as volcanic eruptions, but other human activities include the largest amount of coal combustion facilities such as thermal power plants, and medical waste incineration facilities, municipal solid waste incineration facilities, and cement. Manufacturing facilities are known as major sources of mercury.

In recent years, research on the reduction of mercury is being actively conducted. Among them, activated carbon injection is most widely used as a method for reducing mercury discharged from a boiler. Activated carbon is mainly used for the treatment of trace organic pollutants such as dioxins and inorganic gases such as sulfates and nitrogen oxides as well as mercury. However, there is a problem of economics because the price of activated carbon is very expensive. Second, wet flue gas desulfurization scrubbers are used. This is a facility for removing sulfur oxides, but the mercury present in the gas discharged through the boiler takes the form of Hg, which is a mercury metal, and HgCl 2 , which is a gas component. On the other hand, HgCl 2 is water-soluble and well soluble in water, which shows a maximum reduction of about 70% by wet flue gas desulfurization scrubber. Third, dry flue gas desulfurization scrubbers are used. This method is applied to the system for spraying the absorbent used in the wet flue gas desulfurization scrubber. Desulfurized scrubbers have a slightly higher initial investment compared to activated carbon, but have a low operating cost and are economically economical, while reducing the reduction efficiency considerably.

There is a method for removing mercury from flue gas using sulfide containing gases and solutions (Registration No. 10-0513894-000). This method, already introduced in the USEPA report (EPA-452 / R-97-010), removes mercury by the following reaction.

Hg (gas) + Na 2 S + 2H 2 O → HgS (solid) + 2NaOH + H 2

HgCl 2 (gas) + Na 2 S → HgS (solid) + 2NaCl

However, this method has a big disadvantage that the sulfur (S) required for removal is easily reacted with calcium, which is used for the purpose of desulfurization in boilers, and CaS is generated, which acts as an obstacle to mercury removal.

An object of the present invention is to provide an incinerator using a blast furnace slag and a method for removing mercury in the incinerator.

The incinerator injects blast-furnace slag powder into a desulfurization plant that processes the gas discharged from the boiler, gas containing mercury mercury discharged from the desulfurization plant, and the blast furnace slag powder sprays the blast furnace slag powder to adsorb mercury. Apparatus and the bag filter which filters the blast furnace slag which adsorb | sucked the said mercury are included.

The blast furnace handmade slag powder has pores, and its surface area is 50 to 54 m 2 / g.

The mercury removal method of the incinerator includes the steps of crushing the blast furnace slag into fine powder, alkali treating the pulverized blast furnace slag with a caustic soda solution, heat treating the alkali treated blast furnace slag, and the heat treatment. Blast furnace slag is injected into the gaseous mercury of the incinerator to adsorb the mercury.

The alkali treatment may be performed for 1 hour with 1% caustic soda solution. The heat treatment may be performed at a temperature of 300 ℃ for 12 hours.

The surface area of the blast furnace slag before the grinding is about 13 m 2 / g, and the surface area of the blast furnace slag after the heat treatment may be about 52 m 2 / g.

According to an embodiment of the present invention, the gas containing mercury gas is manufactured in the form of powder of blast furnace slag having improved surface area to form a powder of a predetermined size to remove a gaseous mercury by injecting a predetermined amount to the front of the dust collector.

By using the blast furnace slag, a steel by-product to remove mercury, the blast furnace slag can be recycled and added at the same time to achieve high value-added resources.It can be used to remove resources such as mercury and other gaseous harmful metals. This is possible.

Therefore, the present invention exhibits high mercury removal efficiency similar to activated carbon, and is economical, does not cause secondary pollution problems, and may not prevent desulfurization reduction.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art may easily implement the technical idea of the present invention. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed contents may be thorough and complete, and the technical spirit of the present invention may be sufficiently delivered to those skilled in the art.

In the drawings, each component may be exaggerated for clarity. The same reference numerals throughout the specification represent the same components.

1 is a schematic view for explaining an incinerator using the blast furnace slag powder injection apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the blast furnace slag powder injection device 13 is installed in the incinerator 100. After the gas discharged from the boiler 11 passes through the desulfurization facility 12, the gas is reacted (adsorption) with the blast furnace slag injected from the blast furnace slag powder injection device 13 and collected in the bag filter 14. In addition, the stack 15 is installed between the desulfurization facility 12 and the blast furnace slag powder injection device 13, the mercury in the front end measurement port 16 and the rear end measurement port 17 of the blast furnace slag powder injection device (13). The concentration of is measured.

2 is a flowchart illustrating a method of removing mercury in an incinerator according to an embodiment of the present invention.

Mercury removal method of the incinerator is the step of crushing the blast furnace slag in the form of fine powder (S1), the alkali treatment of the pulverized blast furnace slag with a caustic soda solution (S2), the heat treatment of the alkali-treated blast furnace slag Step (S3), and the heat-treated blast furnace slag is injected into the gaseous mercury of the incinerator, the step of adsorbing mercury (S4). The alkali treatment step (S2) may be performed for 6 hours with 1% caustic soda solution. The heat treatment step (S3) may be performed at a temperature of 300 ℃ for 12 hours. The surface area of the blast furnace slag before the grinding is about 13 m 2 / g, and the surface area of the blast furnace slag after the heat treatment may be about 52 m 2 / g.

Hereinafter, the embodiment of the present invention will be described in detail.

Table 1 shows the physicochemical composition of blast furnace slag used in the present invention. As shown in Table 1, the blast furnace slag contains a very high alkali metal, and can improve the adsorption capacity of mercury by improving the surface area through a simple chemical treatment.

ingredient CaO SiO 2 Al 2 O 3 MgO MnO T-Fe TiO 2 P 2 O 5 Content (wt%) 35-45 30-40 10-15 5 ~ 8 0.3 ~ 0.6 0.4-0.6 0.5-0.7 0.1-0.2

In order to improve the surface area of such slag slag, the slag of the slag is less than 1mm in diameter, the slag of the ground fine powder slag is alkali treated with 1% caustic soda solution for 6 hours, and the slag of the fine powder slag is alkali treated. Is subjected to a heat treatment step of 300 degrees Celsius for 12 hours. By this step, the surface area of the wood slag is increased by 4 times from about 13m 2 / g to about 52m 2 / g. The material slag with such improved surface area is durable due to its hard material, which is semipermanent, and has a lot of pores.

For example, the mercury removal method of an incinerator is demonstrated concretely. The handmade slag to be used for the adsorption capacity experiment is crushed with a ball mill and manufactured in the form of fine powder having a diameter of 1 mm or less. 100 g of the fine powder slag is immersed in 1 L of an aqueous 1% NaOH solution and left for 6 hours. The ground powdered slag of the base treated with NaOH was filtered through a filter paper and then dried in air for 24 hours. The wood slag is placed in an oven and heated for 12 hours in a nitrogen atmosphere at 300 degrees Celsius. By this process, the surface area of steelmaking slag is increased by 4 times from about 13m 2 / g to about 52m 2 / g.

The adsorption capacity of mercury was compared and evaluated using fine powder blast furnace slag without surface area improvement and blast furnace slag with surface area as an adsorbent. The experimental conditions of the incinerator are as follows.

Boiler Temperature: 912 ℃

Dust collector temperature: 153 ℃

Flue outlet temperature: 127 ℃

Flue discharge flow rate: 320Nm 3 / min.

In the first experiment, the concentrations of mercury measured from the blast furnace slag injector shear measurement port 16 were 22 ng / Nm 3 and 25 ng / Nm 3 , respectively, and the mercury concentration measured from the rear end measurement port 17, the final outlet of the flue gas. Were 18ng / Nm 3 and 3ng / Nm 3 , respectively.

Injection amount (mg / N㎥) Inflow concentration (ng / N㎥) Emission Concentration (ng / N㎥) Removal efficiency (%) Wood slag A (13㎡ / g)  100  22  18  18.18 Wood slag B (52㎡ / g)  100  25  3  88.00

As can be seen from the experimental results shown in Table 2, as a result of spraying the blast furnace slag with an improved surface area, the mercury-containing incinerator flue gas according to the method of the present invention has a considerable mercury removal efficiency of 88%. It can be seen that the adsorption and removal, and in the case of the reclaimed slag without modifying the surface area, the removal efficiency is almost negligible considering the removal efficiency by the bag filter.

In the second experiment, the removal efficiency of mercury was investigated while changing the blast furnace slag injection amount to 50, 100, 200, 500 mg / Nm 3 as shown in Table 3. As shown in Table 3, the mercury removal efficiency is almost the same at 100 mg / Nm 3 or more.

Injection amount (mg / N㎥) Inflow concentration (ng / N㎥) Emission Concentration (ng / N㎥) Removal efficiency (%) 50 27 7 74.07 100 22 3 88.00 200 18 2 88.88 500 26 3 88.46

1 is a schematic diagram of an incinerator for removing mercury using blast furnace slag according to an embodiment of the present invention.

2 is a flowchart illustrating a method of removing mercury in an incinerator according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

11: boiler 12: desulfurization plant

13: blast furnace slag powder injector 14: filtration dust collector

15: stack 16: shear measuring sphere

17: Back end measuring instrument

Claims (6)

A desulfurization plant for treating the gas discharged from the boiler; A blast furnace slag powder spraying device injecting blast furnace slag powder into a gas containing mercury-containing mercury discharged from the desulfurization facility, and the blast furnace slag powder adsorbs mercury; And An incinerator including a bag filter for filtering the blast furnace slag adsorbed to the mercury. The method according to claim 1, The furnace blast furnace slag powder has pores, the incinerator, characterized in that the surface area of 50 ~ 54㎡ / g. Grinding the blast furnace slag into fine powder; Alkali treating the ground blast furnace slag with caustic soda solution; Heat treating the alkali treated blast furnace slag; And And injecting the heat-treated blast furnace material slag into the gaseous mercury of the incinerator to adsorb mercury. The method according to claim 3, The alkali treatment is mercury removal method of the incinerator is carried out for 6 hours with 1% caustic soda solution. The method according to claim 3, The heat treatment is mercury removal method of the incinerator is carried out at a temperature of 300 ℃ for 12 hours. The method according to claim 3, A method for removing mercury in an incinerator in which the surface area of the blast furnace slag before the grinding is about 13 m 2 / g and the surface area of the blast furnace slag after the heat treatment is about 52 m 2 / g.
KR1020070135397A 2007-12-21 2007-12-21 Incinerator and method for removing mercury thereof KR20090067659A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102116482A (en) * 2011-01-30 2011-07-06 浙江省环境保护科学设计研究院 System and process for heat power incineration and purification of volatile organic waste gas boiler
CN109059022A (en) * 2018-07-30 2018-12-21 孙雪峰 A kind of high sodium coal burning boiler burner conveying anticlogging fuel oil composition equipment and test method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102116482A (en) * 2011-01-30 2011-07-06 浙江省环境保护科学设计研究院 System and process for heat power incineration and purification of volatile organic waste gas boiler
CN109059022A (en) * 2018-07-30 2018-12-21 孙雪峰 A kind of high sodium coal burning boiler burner conveying anticlogging fuel oil composition equipment and test method

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