WO2015161675A1 - Procédé et équipement de purification de gaz de combustion contenant du dioxyde de soufre - Google Patents

Procédé et équipement de purification de gaz de combustion contenant du dioxyde de soufre Download PDF

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WO2015161675A1
WO2015161675A1 PCT/CN2015/000271 CN2015000271W WO2015161675A1 WO 2015161675 A1 WO2015161675 A1 WO 2015161675A1 CN 2015000271 W CN2015000271 W CN 2015000271W WO 2015161675 A1 WO2015161675 A1 WO 2015161675A1
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pretreatment
liquid
solution
light energy
gas
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PCT/CN2015/000271
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English (en)
Chinese (zh)
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傅国琳
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林小晓
车道岚
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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
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/69—Sulfur trioxide; Sulfuric acid
    • C01B17/74—Preparation
    • C01B17/76—Preparation by contact processes

Definitions

  • the invention relates to a purification method and device, in particular to a method and a device for purifying flue gas containing sulfur dioxide.
  • China today is one of the most polluted countries in the world (after India). Not long ago, at the regular meeting of the State Council of China, the theme of 'eliminating the heart and lungs of the people' was put forward specifically; the pollution control was combined with the people's state and the people's death, and it was determined to eliminate the hat of the polluting country.
  • the Chinese government has decided not only to take off economically but also to make positive contributions to the country, the people, the future generations, and even the world in the environment.
  • new clean energy sources are limited by reserves and international politics and cannot become the main alternative kinetic energy for domestic industrial demand. Therefore, coal will remain China's main kinetic energy source for a long time. As the industrial demand continues to increase, it means that air pollution will become more serious. Effectively reducing and preventing pollution will always be a arduous task.
  • the current desulfurization technologies include coal mixed lime or additives; direct calcium injection in the furnace and dry bed limestone desulfurization; and wet desulfurization such as calcium alkali method, ammonia alkali method, sodium alkali method, and magnesium alkali method.
  • the current operating cost of desulfurization is 0.3 yuan per watt, and the annual operating cost of a medium-sized 12 megawatt coal-fired power plant is 44.3 million yuan; and the cost of its desulfurization unit is 360 million yuan!
  • One of the best functions of the system is to solve the problem of sulfur dioxide removal without any additional cost.
  • the pretreatment chamber has the ability to eliminate PM10, which is a sulfur dioxide removal device.
  • the high intensity UV lamp and Fenton reaction can react with any organic and inorganic molecules and decompose.
  • the invention can eliminate the sulfur dioxide generated in the coal-fired exhaust gas, and is a physical compounding chemical method, and the sulfur dioxide is oxidized to form sulfuric acid.
  • a method of treating flue gas containing sulfur dioxide comprising the steps of:
  • the solution is configured to have a mass percentage of hydrogen peroxide to water of 3% to 5%.
  • the molar ratio of hydrogen peroxide to metal system is greater than or equal to 10:1;
  • the step (1') is added to adjust the pH to 3 or less with nitric acid, and then an oxidizing agent is added to oxidize the carbon particles to carbon monoxide, and some of the SO 2 is oxidized to SO 3 ; the oxidizing agent is hydrogen peroxide.
  • the volume ratio of hydrogen peroxide to water is 1:18-22, the molar ratio of molybdenum oxide to tungsten oxide is 1:1, the molar ratio of magnesium oxide to magnesium hydroxide is 1:1, and the ratio of molybdenum oxide to water is greater than or equal to 10mol/L, the ratio of tungsten oxide to water is 10mol/L or more, the ratio of magnesium oxide to water is 10mol/L or more, and the ratio of magnesium hydroxide to water is 10mol/L or more, ferric oxide and water.
  • the dosage ratio is 20 mol/L or more.
  • the concentration of the oxidizing agent in the above step (1') needs to be monitored periodically and the oxidizing agent is supplemented as needed to stabilize the concentration of the oxidizing agent in the solution.
  • the metal system in the above step (2) is a Fe(II)/F(III) system or a Cu(I)/Cu(II) system; when the metal system is a Fe(II)/F(III) system, The illumination is ultraviolet light having a wavelength of 200 nm to 400 nm; when the metal system is a Cu(I)/Cu(II) system, the illumination is visible light having a wavelength of 600 nm to 800 nm.
  • the Fe(II)/F(III) system described above consists of FeSO 4 and Fe 3 O 4 particles having a diameter of less than 20 nm.
  • the Cu(I)/Cu(II) system described above consists of Cu 2 O and CuSO 4 particles having a diameter of less than 20 nm.
  • the manner of sufficient contact in the above step (4) is to spray the liquid through the spray device to the gas to increase the area and time of contact of the exhaust gas with the liquid.
  • the liquid from which the pretreatment vessel is derived is removed from the pretreatment vessel by a water pump after removing the particulate matter larger than 10 ⁇ m.
  • the hydrogen peroxide described above is produced by reacting magnesium peroxide, sodium peroxide or calcium peroxide having a diameter of less than 50 nm in the solution.
  • the above ⁇ -hydroxy acid is glycolic acid, pyruvic acid or lactic acid.
  • the manner of sufficient contact in the above step (7) is at least one of directly introducing a gas into the liquid or spraying the liquid through the shower device to the gas.
  • step (8) is added to the step 8' to adsorb and recover the metal system substance by using a commercially available DOW Chemical Company's Amberlite IRC 748 ion exchange resin coating to purify the sulfuric acid-containing solution.
  • a desulfurization device for realizing the above method comprising a pretreatment bin and a light energy bin;
  • the pretreatment bin comprises a pretreatment bin body 1-13, a pretreatment bin sprinkler device 1-2, a pretreatment bin air inlet 1 -4, pretreatment bin pump 1-6, accumulator 1-7, pretreatment bin outlet port 1-8, pretreatment bin inlet port 1-10 and pretreatment bin outlet port 1-12,
  • the bottom of the pretreatment cartridge body 1-13 is the accumulator 1-7, and the pretreatment chamber outlet port 1-8 is disposed at the accumulator 1-7, the pretreatment chamber inlet 1-4, pretreatment
  • the tank inlet port 1-10 and the pretreatment tank outlet port 1-12 are disposed on the pretreatment tank body 1-13 above the accumulator 1-7, and the pretreatment tank outlet port 1-12 is at the pretreatment tank inlet port.
  • the pretreatment chamber spraying device 1-2 is disposed in the pretreatment bin body 1-13, and the pretreatment bin pump 1-6 is connected to the output end of the accumulator 1-7 through a pipe.
  • the light energy bin includes a light energy bin body 2-11, a light energy bin air inlet 2-2, a light energy bin air outlet 2-1, a light energy bin Inlet port 2-3, gas-liquid mixing channel 2-4, light energy bin pump 2-5, light energy bin outlet 2-6, light energy bin spray
  • the device 2-8 and the illumination device 2-10, the light energy bin inlet 2-2 and the light energy bin outlet 2-1 are disposed at an upper portion of the light energy cartridge body 2-11, and the light energy bin inlet 2-3 is disposed in the middle of the light energy storage body 2-11, and the light energy storage port 2-6 is disposed at the bottom of the light energy storage body 2-11, the gas-liquid mixing channel 2-4, the light energy The bin shower device 2-8 and the illumination device 2-10 are located in the
  • the pretreatment bin body 1-13 is provided with a pretreatment bin inspection cover 1-1 at the top, and the pretreatment bin body 1-13 is provided with a pretreatment bin inspection door 1-11 on the side wall of the pretreatment cartridge body 1-13, and the top of the reservoir 1-7 is set.
  • the funnel-shaped collecting plates 1-3, the side walls of the accumulators 1-7 are provided with pre-treatment tank levelers 1-9 and sampling ports 1-5.
  • the pretreatment chamber spraying device 1-2 is a pressure shower device disposed at the top of the pretreatment cartridge body 1-13, or a pressure shower device disposed at the top of the pretreatment cartridge body 1-13. And a spray sprinkler disposed on the inner wall of the pretreatment cartridge body 1-13.
  • the spray droplets of the above-mentioned pressure sprinkler device are uniform wires; the diameter of each drop is 2 to 3 mm, and the interval between each drop is 6 to 10 mm.
  • the pretreatment cartridge body 1-13 described above is made of a stainless steel metal plate.
  • the pretreatment bin pump 1-6 described above is an acid-resistant water pump.
  • the above-mentioned light energy storage body 2-11 is made of a stainless steel metal plate, and the inner wall of the light energy storage body 2-11 is coated with an anti-corrosion coating.
  • the light energy chamber liquid level device 2-7 is disposed on the side wall of the light energy storage body 2-11, and the light energy storage box inspection cover 2-9 is disposed at the top of the light energy storage body 2-11.
  • the illumination device 2-10 described above is a quartz tube ultraviolet lamp or a visible light lamp.
  • the lower half of the above-mentioned light energy storage chamber has a purification plate coated with a commercially available coating of Amberlite IRC 748 ion exchange resin of DOW Chemical Co., Ltd. for adsorbing and recovering the metal system substance and purifying the solution containing sulfuric acid.
  • the liquid in the pretreatment chamber is controlled by an acid-resistant water pump containing water and oxidizing reagents.
  • the water removes PM10 from the flue gas.
  • H 2 O 2 hydrogen peroxide
  • H 2 O 2 is equivalent to a strong oxidizing agent in an acidic reaction environment.
  • the velocity of the flue gas in the ventilation duct exceeds 6 m/s. At this rate, any material carried by the flue gas does not have much time to generate a chemical reaction unless the reaction is exothermic and spontaneous.
  • hydrogen peroxide is relatively inexpensive and safe compared to other strong oxidants, so that when the technology is applied to the industry on a large scale, the cost can be greatly reduced and the safety factor can be improved.
  • a sprinkler system is placed on the top and sides of the pretreatment chamber to ensure adequate long-term contact between the flue gas and the liquid.
  • the flue gas will enter the pretreatment chamber at an angle of 40-50 degrees, causing the flue gas to produce a spiral effect when moving upward.
  • Both the sprinkler system and the spiral effect increase the time that the flue gas stays inside the pretreatment chamber.
  • the even droplets of the shower at the top of the shower ensure maximum contact between the flue gas and the liquid without any back pressure on the exhaust system. Any droplets smaller than 2 mm can be easily carried into the light bin by the exhaust force. Cross-contamination reduces the efficiency of the equipment and therefore needs to be avoided.
  • the side shower system is sprayed to ensure adequate mixing of liquids and gases.
  • Fenton reaction In a light energy chamber, sulfur dioxide is converted to sulfur trioxide by using a photo-assisted Fenton reaction and a catalytic/oxidation reaction.
  • the Fenton reaction is a simple photoinduced oxidation/reduction catalytic reaction.
  • the main feature of the Fenton reaction is its production of reactive oxygen species (ROS), especially hydroxyl radicals. Hydroxyl radicals are the most effective reactive oxygen species, which oxidize any organic (including biomolecules) and inorganic matrices around them.
  • ROS reactive oxygen species
  • the original chemical reaction is the reaction of Fe(II) with H 2 O 2 to form Fe(III) and OH ⁇ (see Figure 4).
  • the reduction of Fe(III) to Fe(II) requires heat or light energy.
  • Fenton reaction efficiency of light depends on the concentration of H 2 O 2, Fe (II) / H 2 O 2 ratio, pH, reaction time and intensity of UV (ultraviolet) light.
  • concentration of H 2 O 2 Fe (II) / H 2 O 2 ratio
  • pH a pH of water
  • reaction time a pH of water
  • UV ultraviolet
  • the smoke in the smoke (the main component of the smog) is actually the coal that is not completely burned.
  • the organic matter contained in the coal is decomposed by heat to produce a flammable gas, also known as "volatile matter" (VOC).
  • VOC volatile matter
  • a mixed gas of various compounds such as hydrocarbons, hydrogen, and carbon monoxide.
  • black smoke When coal combustion conditions are not smashed or when high-volatility coal (poor coal) burns, it is easy to produce carbon particles that are not burnt out, commonly known as “black smoke”; and produce more VOCs such as carbon monoxide and polycyclic aromatic hydrocarbons. Hydrocarbon contaminants such as aldehydes.
  • Any organic carbon-containing molecules present in the flue gas are oxidized to CO 2 as they pass through the light energy bin, and heavy metals and inorganic minerals are deposited in the fiber mercury removal filter in our exhaust duct.
  • the first reaction of hydroxyl radicals with hydrocarbons in flue gas in a light energy chamber is to remove one hydrogen atom from its molecular structure (R) and then form water and alkyl radicals (R ⁇ ) (see Figure 8).
  • the second reaction is that the alkyl radical (R ⁇ ) reacts rapidly with the molecular oxygen to form a peroxy radical (see Figure 9), after which many steps are taken to eventually produce carbon dioxide and water.
  • Sulfur dioxide is oxidized to sulfur trioxide and forms sulfuric acid when it enters the light energy bin.
  • the reaction mechanism is shown in Figure 11 ( Figure 11).
  • the advantages of the invention are: 1.
  • the advantage of the nano material is that the surface area is large, and the mutual transfer of the electron layers between the molecules is very rapid, and the chemical reaction rate can be exponentially accelerated; especially in the field of optics, the diameter of the nanometer is smaller. The greater the activity and momentum of energy. Therefore, in order to make any chemical reaction of the flue gas with such a fast flow rate, the advantages of nanotechnology are undeniable.
  • the self-oxidation-reduction reaction is spontaneous and has the characteristics of a catalyst, so it is not necessary to add it frequently, and the amount is small, which is very economical.
  • the present invention is based on the principle of photo-assisted Fenton reaction and has achieved great success in eliminating soot.
  • the present invention is the most economical and effective method of particulate removal today, which is a more economical and efficient way to control air pollution without any additional manufacturing and operating costs. It can be incorporated into existing dust removal systems for coal-fired boilers to increase their effectiveness and completely replace the old ones.
  • This filtration system can also be used in other industrial markets, including cement plants, steel plants, municipal waste combustion plants, medical waste combustion plants, chlorine gas plants, pulp and paper production plants.
  • Figure 1 is a schematic view showing the structure of a pretreatment chamber having two types of shower devices in an apparatus for treating flue gas containing sulfur dioxide.
  • FIG. 2 is a schematic view showing the structure of a pretreatment chamber having a top pressure spray device in a device for treating flue gas containing sulfur dioxide according to the present invention.
  • FIG 3 is a schematic view showing the structure of a light energy chamber in a device for treating flue gas containing sulfur dioxide according to the present invention.
  • Figure 5 is a reaction equation for the reduction of the first Fe(III) to Fe(II) in the photo-assisted Fenton reaction in a method for treating flue gas containing sulfur dioxide according to the present invention.
  • Figure 7 is a reaction equation for the reduction of a third Fe(III) to Fe(II) in a photo-assisted Fenton reaction in a method for treating flue gas containing sulfur dioxide according to the present invention.
  • Figure 9 is a chemical reaction formula for reacting alkyl radicals with molecular oxygen to form peroxy radicals in a photo-assisted Fenton reaction in a method for treating flue gas containing sulfur dioxide according to the present invention.
  • Figure 10 is a chemical reaction formula for the decomposition of C 2 H 6 into carbon dioxide and water in a process for treating flue gas containing sulfur dioxide according to the present invention.
  • Figure 11 is a chemical reaction formula for treating sulfur dioxide containing sulfur dioxide in a process for treating sulfur dioxide containing sulfur dioxide to form sulfur trioxide and form sulfuric acid.
  • Figure 12 shows the recycling structure of the lower part of the light energy bin
  • 1-1 is the pre-treatment warehouse inspection cover
  • 1-2 is the pre-treatment tank sprinkler
  • 1-3 is the funnel-shaped collecting plate
  • 1-4 is the pre-treatment tank inlet
  • 1-5 is the sampling port
  • 1-6 is the pre-treatment tank pump
  • 1-7 is the accumulator
  • 1-8 is the pre-treatment tank outlet
  • 1-9 is the pre-treatment tank level
  • 1-10 is the pre-treatment tank inlet 1-11 is the pre-treatment warehouse inspection door
  • 1-12 is the pre-treatment tank outlet port
  • 1-13 is the pre-treatment tank body
  • 2-1 is the light energy bin outlet
  • 2-2 is the light energy bin air inlet.
  • 2-3 is the light energy inlet
  • 2-4 is the gas-liquid mixing channel
  • 2-5 is the light energy storage pump
  • 2-6 is the light energy storage port
  • 2-7 is the light energy storage liquid Positioner
  • 2-8 is the light energy tank shower device
  • 2-9 is the light energy warehouse inspection cover
  • 2-10 lighting equipment 2-11 is the light energy warehouse body.
  • Figure 12 The main room of the 1 warehouse is 2, the lower purification chamber 3, the purification plate 4, the liquid flow control plug 5, the liquid outlet, the 6 outlet, the air inlet, the inlet
  • Embodiment 1 A method of treating flue gas containing sulfur dioxide, characterized by comprising the steps of:
  • the solution is configured to have a mass percentage of hydrogen peroxide to water of 5%.
  • the molar ratio of hydrogen peroxide to metal system is about 30:1;
  • the step (1') is added to adjust the pH to 3 or less with nitric acid, and then an oxidizing agent is added to oxidize the carbon particles to carbon monoxide, and the oxidizing agent is hydrogen peroxide, hydrogen peroxide and water.
  • the mass percentage is 5%
  • the concentration of the oxidizing agent in the above step (1') needs to be monitored every 10 hours and the oxidizing agent is supplemented as needed to stabilize the concentration of the oxidizing agent in the solution.
  • the metal system in the above step (2) is a Fe(II)/F(III) system; when the metal system is a Fe(II)/F(III) system, the illumination is ultraviolet light having a wavelength of 200 nm to 400 nm. .
  • the Fe(II)/F(III) system described above consists of FeSO 4 and Fe 3 O 4 particles having a diameter of less than 20 nm.
  • the manner of sufficient contact in the above step (4) is to spray the liquid through the spray device to the gas to increase the area and time of contact of the exhaust gas with the liquid.
  • the flue gas in step (4) described above enters from the lower portion of the pretreatment vessel and is oriented horizontally at an angle of 45 degrees to the vessel wall to increase the time of contact with the liquid.
  • the liquid from which the pretreatment vessel is derived is removed from the pretreatment vessel by a water pump after removing the particulate matter larger than 10 ⁇ m.
  • the above ⁇ -hydroxy acid is lactic acid.
  • the manner of sufficient contact in the above step (7) is to directly pass the gas into the liquid and spray the liquid through the spraying device to the gas.
  • the metal system substance is adsorbed and recovered by using Amberlite IRC 748 ion exchange resin coating of commercially available DOW chemical company, and the solution containing sulfuric acid is purified.
  • a desulfurization device for realizing the above method comprising a pretreatment bin and a light energy bin;
  • the pretreatment bin comprises a pretreatment bin body 1-13, a pretreatment bin sprinkler device 1-2, a pretreatment bin air inlet 1 -4, pretreatment bin pump 1-6, accumulator 1-7, pretreatment bin outlet port 1-8, pretreatment bin inlet port 1-10 and pretreatment bin outlet port 1-12,
  • the bottom of the pretreatment cartridge body 1-13 is the accumulator 1-7, and the pretreatment chamber outlet port 1-8 is disposed at the accumulator 1-7, the pretreatment chamber inlet 1-4, pretreatment
  • the tank inlet port 1-10 and the pretreatment tank outlet port 1-12 are disposed on the pretreatment tank body 1-13 above the accumulator 1-7, and the pretreatment tank outlet port 1-12 is at the pretreatment tank inlet port.
  • the pretreatment chamber spraying device 1-2 is disposed in the pretreatment bin body 1-13, and the pretreatment bin pump 1-6 is connected to the output end of the accumulator 1-7 through a pipe.
  • the light energy bin includes a light energy bin body 2-11, a light energy bin air inlet 2-2, a light energy bin air outlet 2-1, a light energy bin Inlet port 2-3, gas-liquid mixing channel 2-4, light energy bin pump 2-5, light energy bin outlet 2-6, light energy bin spray
  • the device 2-8 and the illumination device 2-10, the light energy bin inlet 2-2 and the light energy bin outlet 2-1 are disposed at an upper portion of the light energy cartridge body 2-11, and the light energy bin inlet 2-3 is disposed in the middle of the light energy storage body 2-11, and the light energy storage port 2-6 is disposed at the bottom of the light energy storage body 2-11, the gas-liquid mixing channel 2-4, the light energy The bin shower device 2-8 and the illumination device 2-10 are located in the
  • the pretreatment bin body 1-13 is provided with a pretreatment bin inspection cover 1-1 at the top, and the pretreatment bin body 1-13 is provided with a pretreatment bin inspection door 1-11 on the side wall of the pretreatment cartridge body 1-13, and the top of the reservoir 1-7 is set.
  • the funnel-shaped collecting plates 1-3, the side walls of the accumulators 1-7 are provided with pre-treatment tank levelers 1-9 and sampling ports 1-5.
  • the pretreatment chamber sprinkler device 1-2 described above is a pressure sprinkler device disposed at the top of the pretreatment cartridge body 1-13 and a spray sprinkler device disposed on the inner wall of the pretreatment cartridge body 1-13. (see picture 1)
  • the spray droplets of the above-mentioned pressurized shower device are uniform wires; each droplet has a diameter of 2 to 3 mm, and each droplet is spaced apart by 8 mm.
  • the pretreatment cartridge body 1-13 described above is made of a stainless steel metal plate.
  • the pretreatment bin pump 1-6 described above is an acid-resistant water pump.
  • the above-mentioned light energy storage body 2-11 is made of a stainless steel metal plate, and the inner wall of the light energy storage body 2-11 is coated with a 2-3 mm Teflon anticorrosive coating.
  • the light energy chamber liquid level device 2-7 is disposed on the side wall of the light energy storage body 2-11, and the light energy storage box inspection cover 2-9 is disposed at the top of the light energy storage body 2-11.
  • the illumination device 2-10 described above is a quartz tube ultraviolet lamp.
  • the lower part of the desulfurization chamber has a purification plate (Fig. 12) coated with a commercially available coating of Amberlite IRC 748 ion exchange resin of DOW Chemical Co., Ltd. for adsorption recovery of the metal system substance and purification of the solution containing sulfuric acid.
  • the diameter and height of the pretreated cartridge body 1-13 are 2.7 meters and 3 meters, respectively;
  • the diameter and height of the light energy bins 2-11 are 2.7 meters and 2.25 meters, respectively;
  • the flue gas discharged from the outlet port 1-12 of the pretreatment chamber is introduced into the light energy bin body 2-11 from the light source bin inlet 2-2, and is in contact with the liquid at the gas-liquid mixing channel 2-4. After the gas floats out of the liquid surface, it reacts with the droplets ejected from the light energy tank spraying device 2-8 to decompose the hydrocarbons in the flue gas into carbon dioxide and water, and the carbon particles and carbon monoxide are oxidized into carbon dioxide, while sulfur dioxide Oxidizing to sulfur trioxide and dissolving in solution to form sulfuric acid, wherein hydrocarbons commonly found in flue gas, including C 2 H 6 , can be decomposed in the light energy bin (see Figure 10);
  • the purified gas is discharged from the light energy storage port 2-1 to the light energy storage body 2-11.
  • the method of the present invention has achieved a SO 2 removal rate of from 99.68% or more (from 314 ⁇ g/m 3 to 1 ⁇ g/m 3 ).
  • a method of treating flue gas containing sulfur dioxide comprising the steps of:
  • the solution is configured to have a ratio of hydrogen peroxide to water of 4%.
  • the molar ratio of hydrogen peroxide to metal system is 10:1;
  • the step (1') is added to adjust the pH to 3 or less with nitric acid, and then an oxidizing agent is added to oxidize the carbon particles to carbon monoxide.
  • the oxidizing agent is a mixture of molybdenum oxide and tungsten oxide, and is oxidized.
  • the solid particles of molybdenum and tungsten oxide have a diameter of less than 20 nm, a molar ratio of molybdenum oxide to tungsten oxide of 1:1, and a mixture concentration of molybdenum oxide and tungsten oxide of ⁇ 10 mol/L.
  • the concentration of the oxidizing agent in the above step (1') needs to be monitored periodically and the oxidizing agent is supplemented as needed to stabilize the concentration of the oxidizing agent in the solution.
  • the metal system in the above step (2) is a Cu(I)/Cu(II) system, and the light is visible light having a wavelength of 600 nm to 800 nm.
  • the Cu(I)/Cu(II) system described above consists of Cu 2 O and CuSO 4 particles having a diameter of less than 20 nm.
  • the manner of sufficient contact in the above step (4) is to spray the liquid through the spray device to the gas to increase the area and time of contact of the exhaust gas with the liquid.
  • the flue gas in step (4) described above enters from the lower portion of the pretreatment vessel and is oriented horizontally at an angle of 45 degrees to the vessel wall to increase the time of contact with the liquid.
  • the liquid from which the pretreatment vessel is derived is removed from the pretreatment vessel by a water pump after removing the particulate matter larger than 10 ⁇ m.
  • the hydrogen peroxide described above is produced after the reaction in the solution of magnesium peroxide having a diameter of less than 50 nm.
  • the above ⁇ -hydroxy acid is glycolic acid.
  • the manner of sufficient contact in the above step (7) is to directly pass the gas into the liquid and spray the liquid through the spraying device to the gas.
  • a sulfur removal device for realizing the above method comprising a pretreatment bin and a light energy bin;
  • the pretreatment bin comprises a pretreatment bin body 1-13, a pretreatment bin sprinkler device 1-2, a pretreatment bin air inlet 1-4, pre-treatment tank pump 1-6, reservoir 1-7, pre-treatment tank outlet port 1-8, pre-treatment tank inlet port 1-10 and pre-treatment tank outlet port 1-12,
  • the bottom of the pretreatment cartridge body 1-13 is the accumulator 1-7
  • the pretreatment bin outlet port 1-8 is disposed at the accumulator 1-7, the pretreatment bin inlet 1-4, pre The treatment tank inlet port 1-10 and the pretreatment tank outlet port 1-12 are disposed on the pretreatment tank body 1-13 above the accumulator 1-7, and the pretreatment tank outlet port 1-12 is in the pretreatment tank inlet.
  • the pretreatment chamber spray device 1-2 is disposed in the pretreatment bin body 1-13, and the pretreatment bin pump 1-6 is connected to the output of the accumulator 1-7 through a pipe.
  • the device 2-8 and the illumination device 2-10, the light energy bin inlet 2-2 and the light energy bin outlet 2-1 are disposed at an upper portion of the light energy cartridge body 2-11, and the light energy bin inlet 2-3 is disposed in the middle of the light energy storage body 2-11, and the light energy storage port 2-6 is disposed at the bottom of the light energy storage body 2-11, the gas-liquid mixing channel 2-4, the light energy The bin shower device 2-8 and the illumination device 2-10 are located in the
  • the pretreatment bin body 1-13 is provided with a pretreatment bin inspection cover 1-1 at the top, and the pretreatment bin body 1-13 is provided with a pretreatment bin inspection door 1-11 on the side wall of the pretreatment cartridge body 1-13, and the top of the reservoir 1-7 is set.
  • the funnel-shaped collecting plates 1-3, the side walls of the accumulators 1-7 are provided with pre-treatment tank levelers 1-9 and sampling ports 1-5.
  • the pretreatment chamber shower device 1-2 described above is a pressure shower device disposed at the top of the pretreatment cartridge body 1-13. (See Figure 2)
  • the spray droplets of the above-mentioned pressurized shower device are uniform wires; each droplet has a diameter of 2 to 3 mm, and each droplet is spaced apart by 8 mm.
  • the pretreatment cartridge body 1-13 described above is made of a stainless steel metal plate.
  • the pretreatment bin pump 1-6 described above is an acid-resistant water pump.
  • the above-mentioned light energy storage body 2-11 is made of a stainless steel metal plate, and the inner wall of the light energy storage body 2-11 is coated with a 2-3 mm Teflon anticorrosive coating.
  • the light energy chamber liquid level device 2-7 is disposed on the side wall of the light energy storage body 2-11, and the light energy storage box inspection cover 2-9 is disposed at the top of the light energy storage body 2-11.
  • the illumination device 2-10 described above is a visible light lamp.
  • one of the advantages of using the Cu(I)/Cu(II) system is that the light absorption peak of Cu 2 O is 600 nm, and the light absorption peak of CuSO 4 is 700 nm, which is in the visible light region which is very harmful. (600-800nm, near-infrared).

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  • Inorganic Chemistry (AREA)
  • Treating Waste Gases (AREA)

Abstract

La présente invention concerne un procédé et un équipement de purification d'un gaz de combustion contenant du dioxyde de soufre. L'une des meilleures caractéristiques du système est que le problème d'élimination du dioxyde de soufre est résolu sans entraîner de coûts supplémentaires. Une chambre de prétraitement permet d'éliminer les PM10. Une chambre à énergie solaire sert d'appareil d'élimination de dioxyde de soufre. Une lampe ultraviolette de haute intensité et une réaction de Fenton permettent de créer une réaction avec toute molécule organique et inorganique, et de décomposer ce type de molécules. Ceci permet d'éliminer le dioxyde de soufre produit dans un gaz d'échappement de la combustion du charbon. Ledit procédé implique des phénomènes physiques et chimiques. De l'acide nitrique est formé lorsque le dioxyde de soufre est oxydé.
PCT/CN2015/000271 2014-04-23 2015-04-17 Procédé et équipement de purification de gaz de combustion contenant du dioxyde de soufre WO2015161675A1 (fr)

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CN113121130A (zh) * 2019-12-30 2021-07-16 中晶新材料有限公司 胶凝材料的制备方法
CN117505066A (zh) * 2024-01-05 2024-02-06 湖南启航纳米材料科技有限公司 一种黄色氧化钨除铁处理装置

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CN105536481B (zh) * 2016-01-22 2018-06-26 浙江工业大学 循环喷淋式紫外Fenton氧化有机废气处理系统及处理方法
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CN113046148B (zh) * 2021-03-11 2022-04-19 北方民族大学 光-芬顿氧化脱除煤中硫分的方法

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CN117505066A (zh) * 2024-01-05 2024-02-06 湖南启航纳米材料科技有限公司 一种黄色氧化钨除铁处理装置
CN117505066B (zh) * 2024-01-05 2024-03-29 湖南启航纳米材料科技有限公司 一种黄色氧化钨除铁处理装置

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