A pretreatment desulfurization system for reducing the sulfur content of coal by impregnating the catalyst

Abstract

The present invention provides a pre-treatment desulfurization system, including: a first chute supplying coal supplied through a belt conveyor to a pre-treatment device; the pre-treatment device desulfurizing the coal by immersing the supplied coal into a catalyst mixed solution mixed with a desulfurization catalyst and water; a mesh conveyor separating the coal immersed into the catalyst mixed solution through the pre-treatment device into a liquid phase and catalyst-treated coal; the mesh conveyor conveying the catalyst-treated coal; and a storage tank storing the conveyed catalyst-treated coal.

Description

Technical Field

[0001] This invention relates to a pretreatment desulfurization system for reducing the sulfur content of coal by impregnating a catalyst, and more particularly to a system for reducing sulfur oxides (SO₄) in coal used as fuel. x To reduce emissions of sulfur oxides (SO₂) from coal combustion, desulfurization catalysts with pretreatment desulfurization functions are used to adsorb and reduce these oxides. x A pretreatment desulfurization system that reduces the sulfur content of coal by impregnating it with a catalyst. Background Technology

[0002] Sulfur oxides (SO) x ) and nitrogen oxides (NO) x Sulfur oxides are a major source of air pollution, especially since they are contained in industrial waste gases released during the combustion of fossil fuels containing sulfur, which can lead to various environmental pollution problems such as acid rain.

[0003] People have long been studying desulfurization methods for primary sulfur oxides in industrial waste gas, as described above. In factories or power plants that use talc fuel, flue gas desulfurization methods are commonly used.

[0004] Flue gas desulfurization (FGD) refers to the process of treating the flue gas emitted after the combustion of fossil fuels containing sulfur gases. As mentioned above, FGD methods can be divided into wet and dry methods. Wet methods remove sulfur oxides by washing the soot with solutions such as ammonia, sodium hydroxide, or lime slurry. Dry methods remove sulfur oxides by contacting particles or powders such as activated carbon or carbonates with the soot to adsorb or react with sulfur dioxide.

[0005] However, using flue gas desulfurization methods presents several challenges, including the need to construct separate desulfurization equipment for treating exhaust gases, the high manpower and cost required to operate the equipment, and the complexity of the desulfurization process.

[0006] Therefore, in order to significantly improve the environmental pollution problems caused by the combustion of fossil fuels and the emission of sulfur oxides as described above, there is an urgent need for an effective pretreatment desulfurization system that is simple, easy to apply, and can significantly reduce the emission of sulfur oxides. Summary of the Invention

[0007] The present invention aims to solve the existing problems as described above. The purpose of the present invention is to provide a pretreatment desulfurization system that reduces the sulfur content of coal at the source by impregnating a catalyst in order to prevent the emission of sulfur oxides generated during the combustion of fossil fuels such as coal into the atmosphere.

[0008] To achieve the objectives described above, one aspect of the present invention provides a pretreatment desulfurization system, comprising: a first chute for supplying coal conveyed by a belt conveyor to a pretreatment device; the pretreatment device for desulfurizing the coal by impregnating the supplied coal in a catalyst mixture containing a desulfurization catalyst and water; a mesh conveyor for separating the coal impregnated in the catalyst mixture from the pretreatment device into a liquid phase and catalyst-treated coal; and a storage tank for storing the separated catalyst-treated coal.

[0009] The mesh conveyor is preferably configured to separate the liquid phase of the coal impregnated in the catalyst mixture by allowing it to fall through the mesh conveyor and leaving the catalyst-treated coal residue on the mesh conveyor.

[0010] Preferably, it may also include a recovery tank for collecting and storing the liquid phase separated in the mesh conveyor and resupplying it to the pretreatment device.

[0011] Preferably, the pretreatment device may include: a pretreatment conveyor for loading coal via a first chute; a frame mounted on the upper part of the travel path of the pretreatment conveyor; a first nozzle mounted on and supported on the frame at the upper part of the beginning portion of the pretreatment conveyor, for spraying a catalyst mixture into the pretreatment conveyor before loading coal and for spraying the catalyst mixture onto the upper part of the coal loaded onto the pretreatment conveyor; a first hook and a first hook nozzle, as components for spraying the catalyst mixture while scraping the side of the coal moving along the pretreatment conveyor by mounting on the upper part of the pretreatment conveyor, the first hook being mounted on and supported on the frame separately from the first nozzle and configured to contact one side of the surface of the pretreatment conveyor, the first hook nozzle being configured along the side of the first hook; a second hook and a second hook nozzle configured to face the first hook and the first hook nozzle; and a second nozzle mounted on and supported on the frame at the upper part of the end portion of the pretreatment conveyor for spraying the catalyst mixture onto the upper part of the coal moving along the pretreatment conveyor.

[0012] Preferably, the cross-section of the pretreatment conveyor can be U-shaped to facilitate impregnation of coal mixed with catalyst solution.

[0013] Preferably, the pretreatment apparatus may include: a screw conveyor for impregnating coal into a catalyst mixture by supplying coal and a catalyst mixture; and a third nozzle and a fourth nozzle for supplying the catalyst mixture by being connected to the upper part of the screw conveyor.

[0014] Preferably, the catalyst mixture can be a mixture of desulfurization catalyst and water in a ratio of 1:1 to 1:20.

[0015] Preferably, 1 to 5 parts by weight of the desulfurization catalyst and 50 to 100 parts by weight of water can be supplied relative to 100 parts by weight of the coal.

[0016] Preferably, the desulfurization catalyst may include: (a) one or more oxides selected from the group consisting of SiO2, Al2O3, Fe2O3, TiO2, MgO, MnO, CaO, Na2O, K2O and P2O3; (b) one or more metals selected from the group consisting of Li, Cr, Co, Ni, Cu, Zn, Ga, Sr, Cd and Pb; and (c) one or more liquid compositions selected from the group consisting of sodium tetraborate (Na2B4O7·10H2O), sodium hydroxide (NaOH), sodium silicate (Na2SiO3) and hydrogen peroxide (H2O2).

[0017] Preferably, the oxide may comprise 15 to 90 parts by weight of SiO2, 15 to 100 parts by weight of Al2O3, 10 to 50 parts by weight of Fe2O3, 5 to 15 parts by weight of TiO2, 20 to 150 parts by weight of MgO, 10 to 20 parts by weight of MnO, 20 to 200 parts by weight of CaO, 15 to 45 parts by weight of Na2O, 20 to 50 parts by weight of K2O, and 5 to 20 parts by weight of P2O3, while the metal may comprise 0.0035 to 0.009 parts by weight of Li, 0.005 to 0.01 parts by weight of Cr, 0.001 to 0.005 parts by weight of Co, 0.006 to 0.015 parts by weight of Ni, 0.018 to 0.03 parts by weight of Cu, 0.035 to 0.05 parts by weight of Zn, and Ga... 0.04 to 0.08 parts by weight, Sr 0.02 to 0.05 parts by weight, Cd 0.002 to 0.01 parts by weight and Pb 0.003 to 0.005 parts by weight.

[0018] Preferably, the size of the oxide and metal particles can be 1 to 2 μm, and the specific gravity can be 2.5 to 3.0.

[0019] Preferably, the liquid composition may contain 20 to 130 parts by weight of sodium tetraborate (Na2B4O7·10H2O), 15 to 120 parts by weight of sodium hydroxide (NaOH), 50 to 250 parts by weight of sodium silicate (Na2SiO3), and 10 to 50 parts by weight of hydrogen peroxide (H2O2).

[0020] Preferably, the desulfurization catalyst can be formed from the oxide, metal, and liquid composition to form a metal chelate compound.

[0021] The coal pretreatment desulfurization system of the present invention, which utilizes a pretreatment desulfurization catalyst, can prevent the large amount of sulfur oxides generated during coal combustion from being emitted into the atmosphere in advance, thus largely solving the air pollution problem caused by sulfur oxides.

[0022] Furthermore, the pretreatment desulfurization system according to the present invention differs from existing methods for desulfurizing exhaust gas after fuel combustion. By impregnating coal with a pretreatment desulfurization catalyst, the coal is pretreated to be catalyst-impregnated, with the pretreatment desulfurization catalyst impregnated inside the coal. Then, the pretreatment desulfurization catalyst is burned together with the coal through combustion. Thus, the existing combustion system can be used without investing in additional desulfurization equipment. Therefore, it has the advantages of simple structure, convenient application, and excellent desulfurization effect.

[0023] Furthermore, the pretreatment desulfurization system according to the present invention can recover and reuse the pretreatment desulfurization catalyst from the liquid phase discharged after coal pretreatment, thus having the advantages of being economical and environmentally friendly. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the pretreatment desulfurization system according to the present invention.

[0025] Figure 2 This is a schematic diagram illustrating the pretreatment device of the pretreatment desulfurization system according to the present invention.

[0026] Figure 3 It is the aforementioned Figure 2 The diagram illustrates the coal pretreatment process in the pretreatment unit.

[0027] Figure 4 This is a schematic diagram illustrating the pretreatment device of the pretreatment desulfurization system according to the present invention.

[0028] Figure 5 It is the aforementioned Figure 3 A schematic diagram illustrating another embodiment of the pretreatment apparatus. Detailed Implementation

[0029] This invention can be modified in many ways and has many embodiments. Specific embodiments will be illustrated in the accompanying drawings and described in detail below.

[0030] However, this is not intended to limit the invention to a specific embodiment, but should be understood to include all modifications, equivalents and even substitutions within the scope of the invention's ideas and technology.

[0031] In this invention, terms such as "comprising" or "having" are used only to indicate the presence of features, numbers, steps, actions, constituent elements, components, or combinations thereof described in the specification, and should not be construed as excluding the possibility of one or more other features, numbers, steps, actions, constituent elements, components, or combinations thereof being present or added.

[0032] The present invention will now be described in detail.

[0033] This invention relates to a pretreatment desulfurization system for reducing the sulfur content of coal by impregnating a catalyst, and more particularly to a system for reducing sulfur oxides (SO₄) in coal used as fuel. x To reduce emissions of sulfur oxides (SO₂) from coal combustion, desulfurization catalysts with pretreatment desulfurization functions are used to adsorb and reduce these oxides. x A pretreatment desulfurization system that reduces the sulfur content of coal by impregnating it with a catalyst.

[0034] Furthermore, the present invention can also be used in places where coal is processed, such as mines, and is also applicable to high-sulfur coal or mixed coal that combines high-sulfur coal and low-sulfur coal.

[0035] Specifically, the present invention provides a pretreatment desulfurization system, comprising: a first chute for supplying coal conveyed by a belt conveyor to a pretreatment device; a pretreatment device for desulfurizing the coal by immersing the supplied coal in a catalyst mixture containing a desulfurization catalyst and water; a mesh conveyor for separating the coal immersed in the catalyst mixture from the pretreatment device into a liquid phase and catalyst-treated coal; and a storage tank for storing the separated catalyst-treated coal.

[0036] The pretreatment desulfurization system of the present invention differs from existing methods for desulfurizing exhaust gas after fuel combustion. By impregnating coal with a pretreatment desulfurization catalyst, the coal is pretreated to have a catalyst-impregnated coal containing the pretreatment desulfurization catalyst. Then, the pretreatment desulfurization catalyst is burned together with the coal through combustion. This allows the use of the existing combustion system without the need for additional investment in desulfurization equipment. Therefore, it has the advantages of simple structure, convenient application, and excellent desulfurization effect.

[0037] Next, the pretreatment desulfurization system 10 according to the present invention will be described in detail with reference to the accompanying drawings illustrating embodiments of the present invention.

[0038] Figure 1 This is a schematic diagram illustrating the overall pretreatment desulfurization system of the present invention.

[0039] like Figure 1As shown, the pretreatment desulfurization system 10 of the present invention includes: a belt conveyor 100 for conveying coal; a first chute 110 for supplying coal from the belt conveyor 100 to a pretreatment device; a pretreatment device 200 for desulfurizing coal by immersing the coal supplied from the first chute in a catalyst mixture containing a desulfurization catalyst and water; a mesh conveyor 300 for separating the coal impregnated in the catalyst mixture after passing through the pretreatment device 200 into a liquid phase and catalyst-treated coal; and a storage tank 400 for storing the separated catalyst-treated coal.

[0040] The coal is transported by the belt conveyor 100 and supplied to the pre-processing unit through the first chute 110, thus minimizing the dust and particulate matter that may be generated when the coal falls directly from the belt conveyor 100 to the pre-processing unit.

[0041] The coal supplied from the first inclined chute 110 can be impregnated in the pretreatment device 200 in a catalyst mixture containing a weak willow catalyst and water, thereby pretreatment into catalyst-treated coal with a pretreatment desulfurization catalyst impregnated inside the coal.

[0042] In the pretreatment device 200, the coal and catalyst mixture are mixed together, allowing the desulfurization catalyst to penetrate into the lumpy coal. This allows for more effective penetration of the desulfurization catalyst into the coal compared to existing methods such as spraying the desulfurization catalyst onto the outside of the coal or using a screw conveyor for mixing. When pretreatment of coal using the desulfurization catalyst via the impregnation method described above, the desulfurization catalyst remains within the coal, thus facilitating the removal of sulfur oxides produced during coal combustion.

[0043] The pretreatment device 200 may also include one or more nozzles for supplying the desulfurization catalyst and water. For example, a single nozzle may be used to supply the desulfurization catalyst and water, but preferably it may include two or more nozzles for supplying the desulfurization catalyst and water respectively.

[0044] The pretreatment desulfurization system according to the present invention may further include a desulfurization catalyst tank 500 for storing the desulfurization catalyst and a water tank 600 for storing water.

[0045] The desulfurization catalyst is stored in a desulfurization catalyst tank 500 and transferred to a pretreatment unit 200 by means of a flow meter and a pump, while the water is stored in a water tank 600 and transferred to the pretreatment unit 200 by means of a flow meter and a pump. At this time, the nozzle of the pretreatment unit 200 is connected to the desulfurization catalyst tank 500 and the water tank 600, thereby supplying the desulfurization catalyst and water to the pretreatment unit through the nozzle.

[0046] By moving the coal impregnated in the catalyst mixture through the pretreatment device 200 to the mesh conveyor 300, the coal can be separated into a liquid phase and a catalyst-treated coal. By separating the coal into the liquid phase and the catalyst-treated coal, the catalyst contained in the separated liquid phase can be reused. Furthermore, without separating the coal into a liquid phase and the catalyst-treated coal, the coal particles may become slurry due to the accumulation of the catalyst mixture impregnated or remaining in the porous structure of the coal in the conveyor; the present invention prevents this problem from occurring.

[0047] The mesh conveyor 300 is configured in the form of a conveyor belt made of mesh material, which can filter solid substances and allow only liquids to pass through.

[0048] The mesh conveyor 300 is characterized in that it allows the liquid phase of coal impregnated in the catalyst mixture to fall through the mesh conveyor 300 and allows the catalyst-treated coal to remain on the mesh conveyor 300, thereby separating them.

[0049] The mesh size of the mesh conveyor 300 can be between 100 and 250.

[0050] The invention is characterized by further comprising: a recovery tank 310 for collecting and storing the liquid phase separated in the mesh conveyor 300 and resupplying it to the pretreatment device 200.

[0051] The liquid phase collected in the recovery tank 310 is in a state of mixture of coal and catalyst, with coal dispersed in the liquid phase, and is supplied by a pump (not shown) to a filter press (not shown) described later.

[0052] The pretreatment desulfurization system 10 of the present invention may further include a filter press (not shown), which can supply the liquid phase collected by the recovery tank 310 and transferred by the pump and separate the coal present in the liquid phase.

[0053] The filter press is formed by a filter. When the liquid phase is introduced and pressurized, the solids inside can be filtered through the filter to form a filter cake, while the liquid phase can pass through the filter.

[0054] The filter cake formed in the filter press is catalyst-treated coal C, which can be transferred to storage tank 400 after separation from the filter press.

[0055] The liquid phase, namely the desulfurization catalyst and water, after passing through the filter will be recovered and transferred to the recovery tank 310. The recovered desulfurization catalyst and water will be stored in the recovery tank 310 and then resupplyed to the pretreatment unit 200 for use via a pump and flow meter.

[0056] According to the present invention, the pretreatment desulfurization system 10 can use the recovery tank 310 to collect the liquid phase discharged after the coal pretreatment, and recover and reuse the desulfurization catalyst from the collected liquid phase, thereby making it more economical and environmentally friendly.

[0057] The catalyst-treated coal C separated by the mesh conveyor 300 can be stored in the storage tank 400 until the moisture contained in the catalyst-treated coal is completely removed. For this purpose, a hot air blower or heating device can be provided inside or outside the storage tank.

[0058] The catalyst mixture is characterized in that the desulfurization catalyst and water are mixed in a ratio of 1:1 to 1:40. For example, the catalyst mixture can be made by mixing the desulfurization catalyst and water in ratios of 1:1 to 1:35, 1:1 to 1:20, 1:1 to 1:15, 1:1 to 1:10, 1:1 to 1:5, 1:3 to 1:40, 1:5 to 1:40, 1:10 to 1:40, or 1:20 to 1:40.

[0059] For every 100 parts by weight of coal supplied to the pretreatment unit 200, 1 to 5 parts by weight of desulfurization catalyst and 50 to 100 parts by weight of water can be supplied. For example, if less than 1 part by weight of the desulfurization catalyst is added, the desulfurization effect may decrease due to insufficient catalyst quantity, while if more than 5 parts by weight of the desulfurization catalyst is added, the combustion efficiency of the coal may decrease due to excessive catalyst impregnation.

[0060] In the following description, the additional configuration and function of the pretreatment device 200 of the pretreatment desulfurization system according to the present invention will be explained.

[0061] The pretreatment device 200 of the pretreatment desulfurization system according to the present invention is a device for pretreatment of coal, and is a device for conveniently mixing coal and catalyst mixture in order to uniformly impregnate coal into catalyst mixture.

[0062] Figure 2 as well as Figure 4 This is a perspective view illustrating an embodiment of the pretreatment device of the pretreatment desulfurization system of the present invention. Figure 5 Yes Figure 4 Another embodiment of the preprocessing apparatus is illustrated in a perspective view.

[0063] like Figure 2 As shown, the pretreatment apparatus 200 according to the present invention includes: a pretreatment conveyor 210 for loading coal through a first chute 110; a frame 211 mounted on the upper part of the travel path of the pretreatment conveyor 210; a first nozzle 212 mounted on and supported on the frame 211 at the upper part of the starting portion of the pretreatment conveyor 210, for spraying a catalyst mixture into the pretreatment conveyor 210 before loading coal and for spraying the catalyst mixture onto the upper part of the coal loaded onto the pretreatment conveyor 210; a first hook 213 and a first hook nozzle 214, which are mounted on the upper part of the pretreatment conveyor 210 to scrape the sides of the coal moving along with the pretreatment conveyor. The assembly for simultaneously spraying the catalyst mixture comprises: a first hook 213 mounted on and supported on the frame 210 separately from the first nozzle 212, and configured to contact one side of the surface of the pretreatment conveyor 210; a first hook nozzle 214 configured along the side of the first hook 213; a second hook 215 and a second hook nozzle 216 configured facing the first hook 213 and the first hook nozzle 214; and a second nozzle 217 mounted on and supported on the frame 211 at the upper part of the end portion of the pretreatment conveyor 210, for spraying the catalyst mixture onto the upper part of the coal being conveyed along with the pretreatment conveyor 210.

[0064] exist Figure 3 Figures (a) to (d) illustrate the use of the aforementioned Figure 2 The pre-processing unit in the process of pre-processing coal.

[0065] When coal is loaded from the first chute 110 to the forward conveyor 210, the accumulated coal will form an angle, similar to when sand is piled up. Therefore, the coal on the inside will be difficult to impregnate into the catalyst mixture.

[0066] Therefore, the pretreatment apparatus 200 according to the present invention can spray the catalyst mixture W onto the pretreatment conveyor 210 through the first nozzle 212 before loading coal onto the pretreatment conveyor 210, and after loading coal onto it using the first chute 110. Figure 3 In (a) of the above, the catalyst mixture is sprayed again onto the coal loaded onto the first nozzle 212, thereby impregnating the coal. Figure 3 (b) in the middle.

[0067] However, even when the coal is impregnated by spraying the catalyst mixture onto the pretreatment conveyor 210, the catalyst mixture may still have difficulty penetrating the interior because the coal is piled up. Therefore, in order to ensure that the catalyst mixture is evenly impregnated into the interior of the coal, a first hook and a second hook arranged opposite to each other on the surface of the pretreatment conveyor 210 can be used to scrape the two sides of the coal moving in the traveling direction along with the pretreatment conveyor 210, thereby creating a gap between the pretreatment conveyor and the coal. Figure 3 (c)], and using the first hook nozzle 214 and the second hook nozzle 216 installed on the sides of the first hook and the second hook respectively, the catalyst mixture is sprayed through the gap onto the bottom side of the pretreatment conveyor 210, thereby impregnating the coal inside. Figure 3 (d) in the middle.

[0068] Next, the catalyst mixture can be sprayed onto the upper part of the coal moving with the pretreatment conveyor 210 using the second nozzle 217 installed at the upper end of the pretreatment conveyor 210, thereby impregnating the coal into the catalyst mixture.

[0069] After the coal impregnated with the catalyst mixture in the pretreatment device 200 is transferred to the mesh conveyor 300 and separated into liquid phase and catalyst-treated coal, the separated catalyst-treated coal can be stored in storage tank 400 before being used for combustion.

[0070] The size and height of the first and second hooks can be adjusted according to the amount of coal, and they can be configured at different heights.

[0071] Furthermore, two or more hooks can be installed at a certain interval as the first hook and the second hook.

[0072] The pretreatment conveyor 210 is characterized in that its cross-section is U-shaped to facilitate impregnation of coal mixed with catalyst solution.

[0073] like Figure 4As shown, the pretreatment apparatus 200 according to the present invention includes: a screw conveyor 220 for impregnating coal into a catalyst mixture by supplying coal and a catalyst mixture; and a third nozzle 222 and a fourth nozzle 223 for supplying the catalyst mixture by being connected to the upper part of the screw conveyor 220.

[0074] The pretreatment device 200 supplies coal from the first chute 110 to the screw conveyor 220, and supplies catalyst or water using the third nozzle and the fourth nozzle respectively, thereby mixing the coal and catalyst mixture in the screw conveyor 220 and impregnating the coal into the catalyst mixture.

[0075] After the coal impregnated in the catalyst mixture is transferred through the second chute 224 to the mesh conveyor 300 and separated into liquid phase and catalyst-treated coal, the separated catalyst-treated coal can be stored in storage tank 400 before being used for combustion.

[0076] The pretreatment device 200 may further include a drive unit 221 for driving the rotation of the rotor blades of the screw conveyor 220.

[0077] Figure 5 The preprocessing apparatus 200 illustrated in the figure shows a process in conjunction with the... Figure 4 The screw conveyor 220 in the same pretreatment device 200 is positioned at an angle rather than horizontally.

[0078] Figure 5 The pretreatment device 200 shown in the figure needs to be designed according to the width or height of a specific space. The pretreatment desulfurization system can be designed according to the size of the space by adjusting the angle of the screw conveyor.

[0079] The pretreatment device 200 and Figure 4 Similar to the pretreatment device 200, coal is supplied from the first chute 110 to the screw conveyor 220, and catalyst or water is supplied by the third nozzle and the fourth nozzle respectively, thereby mixing the coal and catalyst mixture in the screw conveyor 220 and impregnating the coal into the catalyst mixture.

[0080] After the coal impregnated in the catalyst mixture is transferred through the second chute 224 to the mesh conveyor 300 and separated into liquid phase and catalyst-treated coal, the separated catalyst-treated coal can be stored in storage tank 400 before being used for combustion.

[0081] The pretreatment device 200 may further include a conveyor discharge section 225 for discharging the liquid phase into the lower end of the screw conveyor 220 on the side opposite to the second chute 224.

[0082] Because the screw conveyor 220 is in an inclined state, the liquid phase material present in the screw conveyor 220 may remain in the opposite direction to the second inclined chute 224. After the coal impregnated in the catalyst mixture is transferred to the mesh conveyor 300 through the second inclined chute 224, the liquid phase remaining on the screw conveyor 220 can be discharged through the conveyor discharge section 225.

[0083] Therefore, a recovery tank 310 can be configured at the lower end of the conveyor discharge section 225 and a drain pipe 311 can be installed at the lower end of the mesh conveyor 300, so that the liquid phase discharged from the mesh conveyor 300 can be collected into the recovery tank 310 through the drain pipe 311.

[0084] The desulfurization catalyst used in this invention is a catalyst capable of removing sulfur oxides produced during coal combustion. It may include one or more oxides selected from the group consisting of SiO2, Al2O3, Fe2O3, TiO2, MgO, MnO, CaO, Na2O, K2O, and P2O3. Moreover, as shown in the following embodiment, it is preferable to use an oxide that simultaneously contains SiO2, Al2O3, Fe2O3, TiO2, MgO, MnO, CaO, Na2O, K2O, and P2O3.

[0085] The basic chemical formula of the oxide when it simultaneously contains SiO2, Al2O3, Fe2O3, TiO2, MgO, MnO, CaO, Na2O, K2O, and P2O3 is K. 0.8-0.9 (Al,Fe,Mg)2(Si,Al)4O 10 (OH)₂ is a mineral commonly known as illite. Illite has a 2:1 structure consisting of an octahedral layer bonded to two tetrahedral layers. The octahedral layer is characterized by a dioctahedral structure where only two of the three cations within the bonded structure are filled with cations. Due to the lack of cations, it carries an overall negative (-) charge. Therefore, it can effectively control sulfur oxides (SO₄²⁻) during combustion of fuel C mixed with a desulfurization catalyst. x Adsorption occurs.

[0086] The various oxides in the desulfurization catalyst may include 15 to 90 parts by weight of SiO2, 15 to 100 parts by weight of Al2O3, 10 to 50 parts by weight of Fe2O3, 5 to 15 parts by weight of TiO2, 20 to 150 parts by weight of MgO, 10 to 20 parts by weight of MnO, 20 to 200 parts by weight of CaO, 15 to 45 parts by weight of Na2O, 20 to 50 parts by weight of K2O, and 5 to 20 parts by weight of P2O3.

[0087] In addition, the oxides can be mixed and pulverized into particles with a particle size of 1 to 2 μm and a specific gravity of 2.5 to 3.0 before being used as streak-colored and silvery-white powders.

[0088] The desulfurization catalyst used in this invention may contain one or more metals selected from the group consisting of Li, Cr, Co, Ni, Cu, Zn, Ga, Sr, Cd and Pb, and as shown in the following embodiment, it is preferable to use a metal that simultaneously contains Li, Cr, Co, Ni, Cu, Zn, Ga, Sr, Cd and Pb.

[0089] The various metals in the desulfurization catalyst may include 0.0035 to 0.009 parts by weight of Li, 0.005 to 0.01 parts by weight of Cr, 0.001 to 0.005 parts by weight of Co, 0.006 to 0.015 parts by weight of Ni, 0.018 to 0.03 parts by weight of Cu, 0.035 to 0.05 parts by weight of Zn, 0.04 to 0.08 parts by weight of Ga, 0.02 to 0.05 parts by weight of Sr, 0.002 to 0.01 parts by weight of Cd, and 0.003 to 0.005 parts by weight of Pb.

[0090] In addition, similar to the oxides, the metals can also be pulverized by a pulverizer into particles with a particle size of 1 to 2 μm and a specific gravity of 2.5 to 3.0, and used in the form of streak-colored and silvery-white powders.

[0091] The desulfurization catalyst used in this invention may comprise one or more liquid compositions selected from the group consisting of sodium tetraborate (Na2B4O7·10H2O), sodium hydroxide (NaOH), sodium silicate (Na2SiO3), and hydrogen peroxide (H2O2), and as shown in the following example, it is preferable to use a liquid composition that simultaneously comprises sodium tetraborate, sodium hydroxide, sodium silicate, and hydrogen peroxide.

[0092] The desulfurization catalyst according to the present invention enables the oxide and liquid composition to act as chelating agents during mixing and reaction, thereby forming chelated metal chelate compounds through coordination with metals.

[0093] Furthermore, the liquid composition can be adsorbed into the ash produced during the combustion of combustible material C, thereby reacting with and removing sulfur oxides present in the ash. NaBO2 is derived from sodium tetraborate (Na2B4O7) and then hydrogenated to produce NaBH4. The generated NaBH4 reacts with oxygen and sulfur oxides to form sodium sulfate (Na2SO4), thereby removing sulfur oxides. The reaction process is shown in reaction formulas 1 and 2 below.

[0094]

Reaction Formula 1

[0095] NaBH4 + O3 → Na2O2 + H2O + B

[0096]

Reaction 2

[0097] 1) Na₂O₂ + SO₃ → Na₂SO₄ + O

[0098] 2) Na₂O₂ + SO₂ → Na₂SO₄

[0099] 3) Na₂O₂ + SO₃ → Na₂SO₃

[0100] In addition, each liquid composition may contain 20 to 130 parts by weight of sodium tetraborate, 15 to 120 parts by weight of sodium hydroxide, 50 to 250 parts by weight of sodium silicate, and 10 to 50 parts by weight of hydrogen peroxide in the desulfurization catalyst.

[0101] Furthermore, after mixing and reacting the desulfurization catalyst, it is allowed to stand for 24 to 72 hours to stabilize it. The desulfurization catalyst can then be separated and used as a liquid-phase composition.

[0102] The desulfurization catalyst used in this invention can activate the adsorption effect on sulfur oxides when mixed and burned with combustible material C in a temperature range of 400 to 1200°C, but it can exhibit higher efficiency when burned in a temperature range of 600 to 900°C.

[0103] The pretreatment desulfurization system 10 of the present invention, which utilizes a desulfurization catalyst, can prevent a large amount of sulfur oxides generated during coal combustion from being emitted into the atmosphere in advance, thus largely solving the air pollution problem caused by sulfur oxides.

[0104] Furthermore, the pretreatment desulfurization system according to the present invention differs from existing methods for desulfurizing exhaust gas after fuel combustion. By impregnating coal with a desulfurization catalyst, the coal is pretreated to be catalyst-impregnated coal with the desulfurization catalyst impregnated inside. Then, the desulfurization catalyst is burned together with the coal by combustion. Thus, the original combustion system can be used without investing in additional desulfurization equipment. Therefore, it has the advantages of simple structure, convenient application and excellent desulfurization effect.

[0105] Furthermore, the pretreatment desulfurization system according to the present invention can recover and reuse the desulfurization catalyst from the liquid phase discharged after pretreatment, thus having the advantages of being economical and environmentally friendly.

[0106] The invention will now be described in more detail with reference to embodiments thereof, but the scope of the invention is not limited by the embodiments described below.

[0107]

Example

[0108] In this embodiment, the sulfur oxide content of coal treated with the catalyst using the pretreatment desulfurization system according to the present invention was compared with that of coal before catalyst treatment.

[0109] Example 1: Performance verification of the desulfurization catalyst system using LOM Coal (Company Name)

[0110] <Preparation of Coal Samples>

[0111] For the purpose of verifying the effectiveness of the desulfurization catalyst, coal supplied by LOM Corporation and sourced locally in Russia was used as a sample.

[0112] The supplied coal is divided into two types, with sulfur (S) contents of 3.51% (coal 1) and 1.17% (coal 2), respectively.

[0113] <Preparation for Catalyst-Processed Coal>

[0114] 3g of desulfurization catalyst 1 (hereinafter referred to as BP-106) and desulfurization catalyst 2 (hereinafter referred to as B3C5) were used as desulfurization catalysts, and 100g of water was used.

[0115] 100g of coal 1 and coal 2 were respectively immersed in a catalyst mixture of 3g of desulfurization catalyst and 100g of water for 20 minutes, and then naturally dehydrated for 30 minutes. The total weight of the coal after natural dehydration was 125 to 135g, which confirms that the amount of catalyst mixture added was approximately 30 parts by weight compared to the weight of the coal.

[0116] The naturally dehydrated catalyst-treated coal was dried in a dryer at 80°C for 8 hours to produce pretreated coal 1 (using coal 1 and BP-106 catalyst), pretreated coal 2 (using coal 1 and B3C5 catalyst), pretreated coal 3 (using coal 2 and BP-106 catalyst) and pretreated coal 4 (using coal 2 and B3C5 catalyst).

[0117] <Sulfur Content Determination and Results>

[0118] To determine the sulfur content of the coal treated with the catalyst, a sulfur analyzer was used in the experiment.

[0119] As the operating conditions for the sulfur analyzer, the sulfur content (SOx) of coal 1, coal 2, and pretreated coal 1 to pretreated coal 4 was determined at 1,050°C, the same temperature conditions as the combustion chamber.

[0120] The average determination results of the total sulfur content of coal 1, pre-treated coal 1, and pre-treated coal 2 are as follows: Figure 6 As shown, the average measured results of the total sulfur content of coal 2, pretreated coal 3, and pretreated coal 4 are as follows: Figure 7 As shown.

[0121] like Figure 6 As shown, it can be confirmed that the average total SOx of coal 1 is 3.51%, and it can also be confirmed that the average total SOx of pretreated coal 1 and pretreated coal 2, which are pretreated with catalyst mixture, are about 1.6% and about 2.0% respectively, with SOx reduction.

[0122] In addition, such as Figure 7 As shown, it can be confirmed that the average total SOx of coal 2 is 1.77%, and the average total SOx of pretreated coal 3 and pretreated coal 4, which are pretreated with catalyst mixture, are about 0.70% and 1.11% respectively, showing a maximum SOx reduction effect of 48%.

[0123] Example 2: Performance verification of desulfurization catalyst systems using Posco anthracite and coking coal

[0124] <Preparation of Coal Samples>

[0125] For the purpose of verifying the effectiveness of the desulfurization catalyst, anthracite and coking coal supplied by Posco were used as coal samples.

[0126] <Preparation for Catalyst-Processed Coal>

[0127] The desulfurization catalyst BP-106 used in Example 1 was used as the desulfurization catalyst, and was used after mixing water and catalyst in ratios of 0:1, 1:1, 2:1, 5:1 and 10:1, respectively.

[0128] 100g of anthracite and coking coal were respectively immersed in 100g of a catalyst mixture of desulfurization catalyst and water mixed in the above proportion for 20 minutes, and then naturally dehydrated for 30 minutes. The total weight of the coal after natural dehydration is shown in Table 1 and Table 2 below.

[0129] The naturally dehydrated catalyst-treated coal is dried in an 80°C dryer for 8 hours to produce pretreated coal.

[0130] <Sulfur Content Determination and Results>

[0131] To determine the sulfur content of the coal treated with the catalyst, a sulfur analyzer was used in the experiment.

[0132] As the operating conditions for the sulfur analyzer, the sulfur content (SOx) of anthracite, coking coal, and pretreated coals 5 to 14 was determined at 1,050°C, the same temperature conditions as the combustion chamber. Each sample was measured 10 or 11 times, and the average value was taken.

[0133] The average total sulfur content of anthracite and its pre-treated coals 5 to 9 is shown in Table 1 below, while the average total sulfur content of coking coal and its pre-treated coals 10 to 14 is shown in Table 2 below.

[0134] Table 1

[0135]

[0136] Table 2

[0137]

[0138]

[0139] As shown in Table 1, the average SOx content of anthracite is 0.377%. In the pretreated coals 5 to 9, which are pretreated with catalyst mixtures to treat anthracite, SOx emissions are reduced, with a maximum reduction of approximately 95%.

[0140] Furthermore, as shown in Table 2, it can be confirmed that the average total SOx of coking coal is 0.853%. In pretreated coal 10 to pretreated coal 14, which are pretreated with catalyst mixtures to treat coking coal, SOx emissions are reduced, with a maximum SOx reduction effect of approximately 71%.

[0141] Industry availability

[0142] This invention can be widely applied to pretreatment desulfurization systems.

Claims

1. A pretreatment desulfurization system, characterized in that, include: The first chute supplies coal, which is conveyed by a belt conveyor, to the pre-processing unit. The pretreatment unit desulfurizes the coal by immersing it in a catalyst mixture obtained by mixing a desulfurization catalyst and water. A mesh conveyor separates coal impregnated in a catalyst mixture after passing through the pretreatment device into a liquid phase and catalyst-treated coal. as well as, A storage tank is used to store the separated catalyst-treated coal. The pretreatment device includes: The pre-processing conveyor loads coal through the first inclined chute; A frame is installed above the travel path of the pretreatment conveyor; The first nozzle, mounted on and supported on the frame at the upper part of the starting section of the pretreatment conveyor, sprays the catalyst mixture into the pretreatment conveyor before loading coal and sprays the catalyst mixture above the coal loaded onto the pretreatment conveyor. The first hook and the first hook nozzle are components that spray a catalyst mixture while scraping the side of the coal being transported by the pretreatment conveyor by being mounted above the pretreatment conveyor. The first hook is mounted on the frame and supported separately from the first nozzle and is configured to contact one side of the surface of the pretreatment conveyor. The first hook nozzle is configured along the side of the first hook. A second hook and a second hook nozzle are mounted on the other side of the pretreatment conveyor and arranged facing the first hook and the first hook nozzle, the second hook nozzle being arranged along the side of the second hook; and, The second nozzle, mounted and supported on the frame above the end portion of the pretreatment conveyor, sprays the catalyst mixture above the coal being conveyed along with the pretreatment conveyor. Of which, relative to 100 parts by weight of the coal, 1 to 5 parts by weight of the desulfurization catalyst and 50 to 100 parts by weight of the water are supplied.

2. The pretreatment desulfurization system according to claim 1, characterized in that: The mesh conveyor separates the coal liquid phase, which is impregnated in the catalyst mixture, by allowing it to fall through the mesh conveyor and leaving the catalyst-treated coal residue on the mesh conveyor.

3. The pretreatment desulfurization system according to claim 1, characterized in that, Also includes: A recovery tank is used to collect and store the liquid phase separated in the mesh conveyor and to resupply it to the pretreatment unit.

4. The pretreatment desulfurization system according to claim 1, characterized in that: The pretreatment conveyor has a U-shaped cross-section to facilitate impregnation of coal mixed with catalyst solution.

5. The pretreatment desulfurization system according to claim 1, characterized in that: The desulfurization catalyst includes: (a) One or more oxides selected from the group consisting of SiO2, Al2O3, Fe2O3, TiO2, MgO, MnO, CaO, Na2O, K2O and P2O3; (b) One or more metals selected from the group consisting of Li, Cr, Co, Ni, Cu, Zn, Ga, Sr, Cd, and Pb; and, (c) A liquid composition selected from the group consisting of sodium tetraborate, sodium hydroxide, sodium silicate and hydrogen peroxide.

6. The pretreatment desulfurization system according to claim 5, characterized in that: The oxide comprises 15 to 90 parts by weight of SiO2, 15 to 100 parts by weight of Al2O3, 10 to 50 parts by weight of Fe2O3, 5 to 15 parts by weight of TiO2, 20 to 150 parts by weight of MgO, 10 to 20 parts by weight of MnO, 20 to 200 parts by weight of CaO, 15 to 45 parts by weight of Na2O, 20 to 50 parts by weight of K2O, and 5 to 20 parts by weight of P2O3. The metal comprises 0.0035 to 0.009 parts by weight of Li, 0.005 to 0.01 parts by weight of Cr, 0.001 to 0.005 parts by weight of Co, 0.006 to 0.015 parts by weight of Ni, 0.018 to 0.03 parts by weight of Cu, 0.035 to 0.05 parts by weight of Zn, 0.04 to 0.08 parts by weight of Ga, 0.02 to 0.05 parts by weight of Sr, 0.002 to 0.01 parts by weight of Cd, and 0.003 to 0.005 parts by weight of Pb.

7. The pretreatment desulfurization system according to claim 5, characterized in that: The oxide and metal particles have sizes of 1 to 2 µm and specific gravities of 2.5 to 3.0, respectively.

8. The pretreatment desulfurization system according to claim 5, characterized in that: The liquid composition comprises 20 to 130 parts by weight of sodium tetraborate, 15 to 120 parts by weight of sodium hydroxide, 50 to 250 parts by weight of sodium silicate, and 10 to 50 parts by weight of hydrogen peroxide.

9. The pretreatment desulfurization system according to claim 5, characterized in that: The desulfurization catalyst is a metal chelate compound formed from the oxide, metal, and liquid composition.

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