KR20160024623A - Device and method for producing sulfuric acid - Google Patents

Abstract

Provided are an apparatus and a method for producing sulfuric acid. According to an embodiment of the present invention, the apparatus for producing sulfuric acid comprises: a cooler which cools the temperature of flue gas including sulfur oxides (SOx); a dust collector which removes dust in the cooled flue gas; a purification unit which removes impurities and moisture in the flue gas with dust removed; a conversion unit which converts sulfur dioxide (SO_2) in the purified flue gas to sulfur trioxide (SO_3) by a catalyst; and an absorption unit which generates sulfuric acid (H_2SO_4) by having converted SO_3 absorbed in water. The method for producing sulfuric acid of the present invention removes dust contained in the flue gas with sulfur oxides (SOx) in advance and prevents a heat exchange tube from being blocked by dust, thereby increasing the production rate of sulfuric acid.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a device for producing sulfuric acid,

The present invention relates to an apparatus and a method for producing sulfuric acid, and more particularly to an apparatus and a method for producing sulfuric acid.

The pollutants contained in the flue-gas are increasing due to the influence of the industrial power generation, and various pollutants such as sulfur oxides (SOx) and nitric oxides (NOx) are contained in the flue gas generated in the steel making process. The sulfur oxides contained in the flue gas are not only the main cause of acid rain in addition to the oxides of nitrogen, but also are the main air pollutants causing optical smog. Therefore, these pollutants must be removed from the flue gas and then discharged to the atmosphere.

BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Patent Laid-Open Publication No. 10-2011-001048870 (published on Mar. 02, 2011, a sulfur oxide treatment apparatus for flue gas).

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus and a method for producing sulfuric acid, in which dust contained in a flue gas generated in a steelmaking process together with a sulfur oxide (SOx) gas is previously removed to raise the sulfuric acid production rate.

According to one aspect of the present invention, there is provided an apparatus for producing sulfuric acid.

The apparatus for producing sulfuric acid according to one embodiment of the present invention includes a cooler for cooling the temperature of the flue gas containing sulfur oxides gas (SOx), a dust-collecting unit for removing dust from the cooled flue-gas, an impurity in the dust- purification unit, contained within the purified the exhaust gas sulfur dioxide (SO ₂₎ the telephone directory, and conversion of sulfur trioxide is converted to sulfur trioxide (SO ₃₎ by the catalyst (SO ₃₎ is absorbed by sulfuric acid (H ₂ SO ₄₎ that And may include an absorption part to be produced.

According to another aspect of the present invention, a method for producing sulfuric acid is provided.

The method for producing sulfuric acid according to an embodiment of the present invention includes the steps of cooling the temperature of the flue gas containing sulfur oxide gas (SOx), removing dust from the cooled flue gas, removing impurities and moisture this removal step is, contained within the purified the exhaust gas sulfur dioxide (SO ₂₎ a step which is converted to sulfur trioxide (SO ₃₎ by the catalyst, and conversion of sulfur trioxide (SO ₃₎ is absorbed by sulfuric acid (H ₂ SO ₄₎ May be generated.

The present invention eliminates the dust in the flue gas before the process of producing the flue gas containing sulfur oxide gas into sulfuric acid to prevent the closure of the heat exchanger tube due to the dust, The sulfuric acid production rate can be increased.

In addition, the present invention can increase the dust removal efficiency and increase the sulfuric acid production rate by pre-cooling the flue gas containing the sulfur oxide gas in the temperature range suitable for the filter for removing the dust.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic representation of an apparatus for producing sulfuric acid according to an embodiment of the present invention.
FIG. 2 and FIG. 3 are views showing a dust collecting part according to an embodiment of the present invention in detail.
4 is a flowchart illustrating a method for producing sulfuric acid according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or corresponding components throughout. .

1 is a schematic view of an apparatus for producing sulfuric acid according to an embodiment of the present invention.

1, the apparatus for producing sulfuric acid includes a regeneration tower 100, a cooler 200, a control unit 250, a dust collecting unit 300, a purifying unit 400, a telephone unit 500, an absorption unit 600, (700).

The regenerator 100 regenerates activated carbon in CSCR (Carbon Selective Catalytic Reduction) that removes sulfur oxide (SOx) and nitrogen oxide gas (NOx) contained in the sintered exhaust gas during a steelmaking process. The regenerator 100 regenerates the activated carbon in the CSCR, and an exhaust gas containing sulfur oxide gas (SOx) is generated.

In the cooler 200, the temperature of the flue gas containing the sulfur oxide gas (SOx) is cooled to a predetermined temperature or lower. Here, the temperature of the exhaust gas flowing into the cooler 200 may be about 400 ° C or higher. The preset temperature may be about 240 ° C, which is the maximum value of the dust collectable temperature in the dust collecting unit 300 have.

The control unit 250 increases the output of the cooler for cooling the temperature of the flue gas when the temperature is higher than a preset temperature in the dust collecting unit 300. When the temperature inside the heat insulating unit is lower than a predetermined temperature, .

The dust collecting unit 300 removes dust from the exhaust gas cooled to a predetermined temperature or lower. The dust collecting unit 300 may cause the clogging of the heat exchanger tubes due to the activated carbon dust in the exhaust gas containing the sulfur oxide gas SOx before the flue gas containing the sulfur oxide gas SOx is introduced into the purifying unit 400 , And then prevents it from affecting the piping of the device. Further, when the dust of the exhaust gas containing sulfur oxide gas (SOx) is 2 mg / m 3 or less, it is possible to prevent the phone unit 500 from interfering with the conversion to sulfur trioxide (SO ₃ ) by acting as a catalyst poison. The dust collecting unit 300 will be described in more detail with reference to FIG. 2 and FIG.

The purifier 400 removes impurities and moisture in the exhaust gas from which dust has been removed. Here, the impurity means a component other than the sulfur oxide gas (SOx).

The telephone unit 500 converts sulfur dioxide (SO ₂ ) contained in the purified exhaust gas into sulfur trioxide (SO ₃ ) by the catalyst. Here, the catalyst may be vanadium pentoxide (V ₂ O ₅ ).

In the absorber 600, the converted sulfur trioxide (SO ₃ ) is absorbed by water to generate sulfuric acid (H ₂ SO ₄ ).

The storage unit 700 stores generated sulfuric acid (H ₂ SO ₄ ).

2 and 3 are views showing a dust collecting part according to an embodiment of the present invention in detail.

2, the dust collecting unit 300 includes an inlet 310, a filter 320, a heat insulating unit 330, a temperature sensor 340, an outlet 350, and a gas detector 360.

In the inflow part 310, the cooled exhaust gas flows through the cooler 200. The inlet 310 may be a bottom inflow. In addition, STS 304 series stainless steel may be used for the inlet 310 considering the acid resistance and abrasion resistance.

The filter portion 320 removes dust contained in the inflowing exhaust gas. The filter unit 320 filters the dust contained in the exhaust gas to a predetermined concentration or less. Here, the predetermined concentration may be 2 mg / m3. The filter unit 320 is a material that can be operated in a preset temperature range because the exhaust gas is cooled to a predetermined temperature or lower in the cooler 200 but is still high in temperature. For example, the filter unit 320 may be made of polytetrafluoroethylene (PTFE) SiO2) or polyaramid.

Referring to FIG. 3, the filter unit 320 may be installed in the first or second stage 322 or 324 depending on the process conditions including the dust concentration, the flow rate of the exhaust gas, and the flow rate of the exhaust gas. The filter unit 320 may be installed in a plurality of directions as shown in FIG.

The heat insulating portion (330) separates the inside of the filter portion (320) and the outside from the heat insulating material in space. The heat insulating portion 330 protects the filter and prevents condensation of the internal condensation and collected dust through heat insulation from the outside.

The temperature sensor 340 senses the temperature inside the dust collecting unit 300.

The outflow portion 350 flows out of the dust collecting portion 300 through the filter portion 320. The outflow section 350 may be an upper flow-out type.

The gas detector 360 detects gas leaking to the outside of the dust collecting unit 300. The gas detector 360 can detect gas leakage in advance and prevent the occurrence of fire due to dust.

As described above, the controller 250 increases the output of the cooler that cools the temperature of the exhaust gas when the temperature is higher than a preset temperature in the dust collecting unit 300, and when the temperature inside the heat insulating unit is lower than a preset temperature , The output of the cooler is reduced. The control unit 250 controls the exhaust gas to be cooled to a temperature range suitable for the filter unit 320 in order to more effectively remove the dust contained in the exhaust gas.

4 is a flowchart illustrating a method for producing sulfuric acid according to an embodiment of the present invention.

Referring to Fig. 4, in the sulfuric acid production apparatus, in step S410, the temperature of the exhaust gas containing sulfur oxide gas (SOx) is cooled.

In the sulfuric acid producing apparatus, in step S420, the dust among the cooled exhaust gas is removed.

The sulfuric acid production apparatus determines in step S422 whether the temperature inside the dust collecting unit 300 is equal to or higher than a predetermined temperature value.

The sulfuric acid production apparatus increases the output of the cooler 200 when the temperature inside the dust collecting unit 300 is equal to or higher than a preset temperature value in step S422. This controls the cooling of the exhaust gas to a temperature range suitable for the filter portion 320 to better remove the dust contained in the exhaust gas.

The sulfuric acid producing apparatus decreases the output of the cooler 200 when the temperature inside the dust collecting unit 300 is lower than a predetermined temperature value in step S424. This controls the cooling of the flue-gas to a temperature range suitable for the filter unit 320 described above.

In the sulfuric acid production apparatus, in step S430, impurities and moisture in the exhaust gas from which dust has been removed are removed.

Sulfuric acid manufacturing unit in step S440, the sulfur dioxide contained in the exhaust gas purifying the (SO ₂₎ is converted to sulfur trioxide (SO ₃₎ by the catalyst.

In the sulfuric acid production apparatus, in step S450, the converted sulfur trioxide (SO ₃ ) is absorbed in water to produce sulfuric acid (H ₂ SO ₄ ).

The present invention eliminates the dust in the exhaust gas, prevents the heat exchanger tube from clogging due to the dust, and prevents the tube from affecting the piping of the apparatus, thereby increasing the sulfuric acid production rate. In addition, the present invention can increase the dust removal efficiency and increase the sulfuric acid production rate by pre-cooling the flue gas containing the sulfur oxide gas in the temperature range suitable for the filter for removing the dust.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention as set forth in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.

100: Play Tower
200: cooler
250:
300: Dust collector
400: purifying section
500: Telephone department
600: absorber
700:

Claims (8)

A cooler in which a temperature of an exhaust gas containing sulfur oxide gas (SOx) is cooled;
A dust collecting part in which dust is removed from the cooled exhaust gas;
A purifier for removing impurities and moisture from the exhaust gas from which dust has been removed;
A dial portion in which sulfur dioxide (SO ₂ ) contained in the purified exhaust gas is converted to sulfur trioxide (SO ₃ ) by a catalyst; And
Wherein the converted sulfur trioxide (SO ₃ ) is absorbed in water to produce sulfuric acid (H ₂ SO ₄ ).
The method according to claim 1,
Wherein the flue gas containing sulfur oxide gas (SOx) cooled in the cooler flows into the cooler in a carbon selective catalytic reduction (CSCR) regeneration tower.
The method according to claim 1,
The dust collecting part
An inlet through which the exhaust gas flows;
A filter unit for removing dust contained in the inflowing exhaust gas;
A heat insulating part separating the filter part from the outside of the dust collecting part by a heat insulating material and protecting the filter part and maintaining an internal temperature; And
A temperature sensor for sensing a temperature inside the dust collecting unit; And
Wherein the inlet portion is located at a lower portion of the dust collecting portion and the outlet portion is located at an upper portion of the dust collecting portion and is a lower inlet type.
The method of claim 3,
And a gas detector positioned outside the dust collecting part to sense gas leakage in the dust collecting part.
The method of claim 3,
And a control unit for increasing the output of the cooler when the temperature inside the dust collecting unit sensed by the temperature sensor is equal to or higher than a predetermined temperature and decreasing the output of the cooler when the temperature inside the dust collecting unit is less than a predetermined temperature Sulfuric acid production equipment.
The method of claim 3,
Wherein the filter is constructed in a different number of stages depending on process conditions, and the material of the filter is PTFE (poly tetra fluoroethylene), silicon dioxide (SiO 2), or polyaramid.
Cooling the temperature of the flue gas containing sulfur oxide gas (SOx);
Removing dust from the cooled exhaust gas;
Removing impurities and moisture from the exhaust gas from which dust has been removed;
Converting sulfur dioxide (SO ₂ ) contained in the purified exhaust gas into sulfur trioxide (SO ₃ ) by a catalyst; And
Wherein the converted sulfur trioxide (SO ₃ ) is absorbed in water to produce sulfuric acid (H ₂ SO ₄ ).
8. The method of claim 7,
Increasing the output of the cooler for cooling the temperature of the exhaust gas when the temperature inside the dust collecting part from which the dust is removed is equal to or higher than a predetermined temperature and decreasing the output of the cooler when the temperature inside the dust collecting part is lower than a preset temperature ≪ / RTI >

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