A high-sulfur coal circulating fluidized bed slag efficient separation calcium sulfur device and method

Abstract

The present application belongs to the technical field of solid waste reduction and resource utilization, and particularly relates to a high-sulfur coal circulating fluidized bed slag efficient separation calcium-sulfur device and method. The device of the present application comprises a feeding device, a dispersion device, a low-calcium low-sulfur particle screening device, and a medium-calcium medium-sulfur particle air separation device, the medium-calcium medium-sulfur particle air separation device being connected with a first dust removal device; a sample preparation system, the sample preparation system being connected with a rapid calcium-sulfur detector, the low-calcium low-sulfur particle screening device and the medium-calcium medium-sulfur particle air separation device being connected with the rapid calcium-sulfur detector; the medium-calcium medium-sulfur particle air separation device being connected with a medium-calcium medium-sulfur particle screening device, the medium-calcium medium-sulfur particle screening device being connected with a low-calcium low-sulfur discharge port and a medium-calcium medium-sulfur discharge port, respectively, and the low-calcium low-sulfur particle screening device being connected with the low-calcium low-sulfur discharge port. The present application provides a method and a skid-mounted device for efficiently screening and separating calcium-sulfur components of high-sulfur circulating fluidized bed coal-fired boiler slag by combining chemical reaction, airflow field and mechanical separation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of solid waste reduction and resource utilization, and particularly relates to a high-efficiency calcium-sulfur separation device and method for high-sulfur coal circulating fluidized bed slag. BACKGROUND

[0002] Circulating fluidized bed (CFB) combustion technology has been rapidly developed worldwide due to its high combustion efficiency, environmental friendliness, large operational flexibility, low-temperature combustion, and material double circulation. Circulating fluidized bed coal-fired boiler slag (CFB slag) accounts for about 20% to 30% of the mass of the coal burned, with a wide range of particle size distribution from a few microns to tens of thousands of microns. The particles are coarse and irregular, with a loose and porous surface and interconnected pores. The mineral composition of CFB slag includes quartz (SiO2), calcite (CaCO3), anhydrite (CaSO4), lime (CaO), slaked lime (Ca(OH)2), primary mullite (Al6Si2O 13 ), hematite (Fe2O3), and amorphous non-crystalline phase mainly composed of calcined clay.

[0003] CFB slag has high pozzolanic activity and is used by many researchers and enterprises as an active admixture for preparing high-performance cementitious materials. However, the relevant national standards GB / T2847 and GB / T1596 require that the SO3 mass content of the active admixture be less than 3.5%. The SO3 mass content of CFB slag formed by high-sulfur coal combustion is generally higher than 3.5%, so high-sulfur coal CFB slag is difficult to utilize effectively.

[0004] Prior art CN114226248B discloses a circulating fluidized bed coal ash quality classification treatment method, which separates CFB ash into four categories of 0-20 microns, 21-100 microns, 101-150 microns and greater than 150 microns by air separation method with the assistance of surfactant, and utilizes them, but does not point out the relationship between chemical component SO3 and particle size. Prior art CN104198655B of the inventor discloses a circulating fluidized bed boiler bottom slag mineral separation method, which points out that the separation of CaO-rich, CaSO4-rich and silicate-rich phases can be realized by physical separation (one or more of gravity separation, electric separation, screening or flotation), but the existing technologies for inorganic solid particle separation or classification, such as a composite vibrating screen screening device CN111992488B, a double-acting screening device for different stone separation CN103934191B, a multi-stage screening device and screening method CN111299136B, a double-layer multi-degree-of-freedom vibrating screening device CN108246607B, a screening device CN107282453B, a construction waste crushing and screening device and method CN110715302B, a screening device vibrating parallel to the screen plate and an efficient screening method CN105396775B, and a closed pneumatic screening device CN216988560U, mainly consider the movement form of the equipment, the structure of the equipment, the screen aperture, the feeding and discharging mode, etc., and the biggest feature is that the separated particles are inert by default, or the chemical reaction of the separated particles is not considered. However, CFB ash will very quickly undergo one or more of the following reactions (1)-(4) in a short time in air, and the results of these reactions will all lead to an increase in particle size. Therefore, the existing screening and other physical methods cannot realize effective separation of calcium, sulfur and other components when used for CFB ash classification.

[0005] CaO + H2O → Ca(OH)2 (1);

[0006] Ca(OH)2 + CO2 → CaCO3 + H2O (2);

[0007] CaSO4 + 0.5H2O → CaSO4·0.5H2O (3);

[0008] Al(OH)4- + CaO + H2O → 3CaO·Al2O3·6H2O (4). SUMMARY

[0009] To solve the above problems existing in the prior art, the purpose of the present application is to provide a method and a skid-mounted device for efficiently screening and separating sulfur and calcium components of high-sulfur circulating fluidized bed coal-fired boiler slag by combining chemical reaction, air flow field and mechanical separation.

[0010] The technical scheme adopted by the present application is:

[0011] A high-efficiency calcium-sulfur separation device for high-sulfur coal circulating fluidized bed slag, comprising feeding device, dispersion device, low-calcium low-sulfur particle screening device and medium-calcium medium-sulfur particle air separation device connected in sequence, and the medium-calcium medium-sulfur particle air separation device is connected with a first dust removal device;

[0012] Further comprising a sample preparation system connected with a rapid calcium-sulfur detector, and the low-calcium low-sulfur particle screening device and the medium-calcium medium-sulfur particle air separation device are connected with the rapid calcium-sulfur detector respectively;

[0013] The medium-calcium medium-sulfur particle air separation device is connected with a medium-calcium medium-sulfur particle screening device, the medium-calcium medium-sulfur particle screening device is connected with a low-calcium low-sulfur discharge port and a medium-calcium medium-sulfur discharge port respectively, and the low-calcium low-sulfur particle screening device is connected with the low-calcium low-sulfur discharge port.

[0014] As a preferred scheme of the present application, the first dust removal device is connected with a high-calcium high-sulfur particle aging device, the high-calcium high-sulfur particle aging device is connected with a second dust removal device, and further comprising a high-calcium high-sulfur discharge port connected with the second dust removal device and the high-calcium high-sulfur particle aging device respectively.

[0015] As a preferred scheme of the present application, the medium-calcium medium-sulfur particle air separation device is connected with a first pressure-regulating atomization device.

[0016] As a preferred scheme of the present application, the high-calcium high-sulfur particle aging device is connected with a second pressure-regulating atomization device.

[0017] As a preferred scheme of the present application, a material layer leveling device is further arranged in the dispersion device.

[0018] As a preferred scheme of the present application, a closing device is arranged between the medium-calcium medium-sulfur particle screening device and the low-calcium low-sulfur discharge port.

[0019] As a preferred scheme of the present application, the medium-calcium medium-sulfur particle air separation device adopts a gravity air separation device.

[0020] A high-efficiency calcium-sulfur separation method for high-sulfur coal circulating fluidized bed slag, comprising the following steps:

[0021] S1: selecting CFB slag with high sulfur and calcium content, SO3 content > 3.5wt.%, and CaO content > 3.5wt.%;

[0022] S2: leveling the CFB slag into a feeding material layer with a thickness < 20mm;

[0023] S3: performing low-calcium low-sulfur particle screening treatment on the CFB slag, and the screening particle size fraction is 1-4;

[0024] S4: The material in the low calcium and low sulfur particle screening device outlet enters the medium calcium and medium sulfur particle air separation device, and the water content of the working gas required for processing unit mass of solid is controlled, and the maximum water content = the mass percentage of active CaO in unit mass of medium calcium and medium sulfur particles x 0.26%;

[0025] S5: The large particles selected in the medium calcium and medium sulfur particle air separation device enter the medium calcium and medium sulfur particle screening device, and the screened particle size is 1-4;

[0026] S6: The small particles selected in the medium calcium and medium sulfur particle air separation device are collected as medium calcium and medium sulfur particles;

[0027] S7: The material collected by the first dust removal device connected to the medium calcium and medium sulfur particle air separation device is high calcium and high sulfur particles. As a preferred embodiment of the present application, in step S1, the CFB slag with high sulfur and calcium content, the slag meeting 3.5wt.%<SO3<10wt.% and 3.5wt.%<CaO<10wt.% is medium calcium and medium sulfur particles, the slag meeting SO3>10wt.% and CaO>10wt.% is high calcium and high sulfur particles, and the rest is low calcium and low sulfur particles.

[0028] As a preferred embodiment of the present application, the high calcium and high sulfur particles are treated by aging.

[0029] The beneficial effects of the present application are:

[0030] 1. The present application can increase the volume of corresponding particles, reduce the reaction activity of the particle surface, and improve the separation efficiency of calcium and sulfur-containing materials through forced rapid hydrolysis and carbonization reaction of CaSO4, CaO and Ca(OH)2.

[0031] 2. The present application improves the resource utilization rate of CFB slag, reduces environmental risk, and improves social, environmental and economic benefits.

[0032] 3. The present application can realize separation and utilization of CFB slag and pollution control, and meet environmental protection requirements.

[0033] 4. In the prior art, the influence of material reaction on separation is not considered, the separation efficiency of the equipment is low, and the product energy consumption is high. Compared with the prior art, the equipment designed by the method of the present application has high efficiency, low energy consumption, small volume, and the overall volume can be moved by vehicle, which is convenient for the graded resource utilization of CFB slag in any scale power plant. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a structural schematic diagram of the present application.

[0035] In the diagram: 1-Sample preparation system; 2-Rapid calcium and sulfur detector; 3-Feeding device; 4-Dispersion device; 5-Low calcium and low sulfur particle screening device; 6-Medium calcium and medium sulfur particle air separation device; 7-First dust removal device; 8-High calcium and high sulfur particle aging device; 9-Second dust removal device; 10-Medium calcium and medium sulfur particle screening device; 11-Low calcium and low sulfur discharge port; 12-Medium calcium and medium sulfur discharge port; 13-High calcium and high sulfur discharge port; 14-First pressure regulating atomizing device; 15-Second pressure regulating atomizing device; 16-Tap water source; 17-Compressed air source. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the invention can be combined with each other.

[0038] like Figure 1 As shown, the high-efficiency calcium-sulfur separation device for high-sulfur coal circulating fluidized bed slag in this embodiment includes a feeding device 3, a dispersing device 4, a low-calcium and low-sulfur particle screening device 5, and a medium-calcium and medium-sulfur particle air separation device 6 connected in sequence. The medium-calcium and medium-sulfur particle air separation device 6 is connected to a first dust removal device 7.

[0039] It also includes a sample preparation system 1, which is connected to a rapid calcium and sulfur detector 2. A low-calcium and low-sulfur particle screening device 5 and a medium-calcium and medium-sulfur particle air separation device 6 are respectively connected to the rapid calcium and sulfur detector 2.

[0040] The medium-calcium and medium-sulfur particle air separation device 6 is connected to the medium-calcium and medium-sulfur particle screening device 10. The medium-calcium and medium-sulfur particle screening device 10 is connected to the low-calcium and low-sulfur discharge port 11 and the medium-calcium and medium-sulfur discharge port 12, respectively. The low-calcium and low-sulfur particle screening device 5 is connected to the low-calcium and low-sulfur discharge port 11.

[0041] Optionally, the first dust removal device 7 is connected with a high calcium and high sulfur particle aging device 8, the high calcium and high sulfur particle aging device 8 is connected with a second dust removal device 9; and a high calcium and high sulfur discharge port 13 is further connected with the second dust removal device 9 and the high calcium and high sulfur particle aging device 8. The high calcium and high sulfur particle aging device 8 is an optional device.

[0042] The medium calcium and medium sulfur particle air separation device 6 is connected with a first pressure regulating atomization device 14. The high calcium and high sulfur particle aging device 8 is connected with a second pressure regulating atomization device 15. The first pressure regulating atomization device 14 and the second pressure regulating atomization device 15 are both provided with tap water from a tap water source 16 and compressed air from a compressed air source 17.

[0043] The sample preparation system 1 comprises a crushing, grinding, tabletting and the like device.

[0044] The rapid calcium and sulfur detector is an offline detection type.

[0045] The dispersion device 4 is further provided with a material layer flattening device.

[0046] The medium calcium and medium sulfur particle screening device 10 is provided with a closing device between the medium calcium and medium sulfur particle screening device 10 and the low calcium and low sulfur discharge port 11.

[0047] The medium calcium and medium sulfur particle air separation device 6 adopts a gravity air separation device.

[0048] The high calcium and high sulfur particle aging device 8 adopts a horizontal or vertical type.

[0049] The high-efficiency calcium and sulfur separation method of the high-sulfur coal circulating fluidized bed slag of the embodiment: comprising the following steps:

[0050] S1: selecting a circulating fluidized bed coal-fired boiler slag (CFB slag) with high sulfur and calcium content, SO3 content > 3.5wt.%, CaO content > 3.5wt.%;

[0051] S2: flattening the CFB slag into a feed material layer with a thickness < 20mm;

[0052] S3: performing low calcium and low sulfur particle screening treatment on the CFB slag, and the screening particle size fraction is 1-4;

[0053] S4: the material at the discharge port of the low calcium and low sulfur particle screening device 5 enters the medium calcium and medium sulfur particle air separation device 6, and the air separation device controls the water content required for processing unit mass of solid, and the maximum water content = unit mass of active CaO mass percentage in medium calcium and medium sulfur particles × 0.26%;

[0054] S5: the large particles selected in the medium calcium and medium sulfur particle air separation device 6 enter the medium calcium and medium sulfur particle screening device 10, and the screening particle size fraction is 1-4;

[0055] S6: The small particles selected in the medium calcium and medium sulfur particle air separation device 6 are collected as medium calcium and medium sulfur particles;

[0056] S7: The material collected by the first dust removal device 7 connected to the medium calcium and medium sulfur particle air separation device 6 is high calcium and high sulfur particles.

[0057] The CFB slag with high sulfur and calcium content refers to the slag discharged from the bottom of the circulating fluidized bed coal-fired boiler after burning high-sulfur fuel.

[0058] In step S1, in the CFB slag with high sulfur and calcium content, the slag satisfying 3.5wt.%<SO3<10wt.% and 3.5wt.%<CaO<10wt.% is medium calcium and medium sulfur particles, the slag satisfying SO3>10wt.% and CaO>10wt.% is high calcium and high sulfur particles, and the rest is low calcium and low sulfur particles.

[0059] The high calcium and high sulfur particles are treated by aging, and further reduction of soluble calcium and sulfur dissolution occurs through hydration reaction.

[0060] In step S3, the smallest screen particle size is not greater than 325 microns;

[0061] In step S5, the large particle size is not less than 160 microns;

[0062] In step S5, the smallest screen particle size is not greater than 212 microns;

[0063] In step S4, the water-containing gas can promote the reaction of active CaO and anhydrous gypsum CaSO4 in the CFB slag, increase the particle size and dispersibility of the material, and improve the separation efficiency.

[0064] Working principle:

[0065] In the bottom slag formed by the circulating fluidized bed (CFB) coal-fired, there are a lot of CaSO4, CaO and Ca(OH)2 fine powder materials. Due to the small particle size and strong adhesion of these fine powder materials, and the fact that they are extremely easy to hydrolyze and carbonize under air conditions, it is difficult to separate them from the silicate materials with a particle size of less than 325 microns in the CFB slag, thus the traditional screening method cannot simultaneously meet the screening yield and sulfur and calcium separation efficiency. Based on the forced rapid hydrolysis and carbonization reaction of CaSO4, CaO and Ca(OH)2, the corresponding particle volume can be increased, and the reactivity of the particle surface can be reduced. On the basis of pre-separation of a small amount of large particle size CFB slag, the use of water-containing gas flow air separation for a large amount of medium particle size CFB slag can weaken the combination of calcium and sulfur materials with silicate materials, and thus achieve the purpose of efficient separation of calcium and sulfur-containing materials.

[0066] Example 1:

[0067] The prying device for efficiently separating sulfur and calcium components of high-sulfur circulating fluidized bed coal-fired boiler slag comprises a sample preparation system 1, a rapid calcium and sulfur detector, a feeding device 3, a dispersion device 4, a low-calcium and low-sulfur particle screening device 5, a medium-calcium and medium-sulfur particle air separation device 6, a medium-calcium and medium-sulfur particle screening device 10, a high-calcium and high-sulfur particle aging device 8, a dust removal device, a first pressure-regulating atomization device 14 and a second pressure-regulating atomization device 15; the low-calcium and low-sulfur particle screening device 5 is connected with the medium-calcium and medium-sulfur particle air separation device 6 at a lower outlet and connected with a low-calcium and low-sulfur discharge port 11 at an upper outlet; the medium-calcium and medium-sulfur particle air separation device 6 uses pressure-regulating atomized mixed gas as working gas, and is connected with the dust removal device at an upper outlet; the dust removal device is connected with the high-sulfur and high-calcium aging device at an outlet; the medium-calcium and medium-sulfur particle air separation device 6 is connected with the medium-calcium and medium-sulfur particle screening device 10 at a large-particle discharge port; the medium-calcium and medium-sulfur particle screening device 10 is connected with the low-calcium and low-sulfur discharge port 11 and a medium-calcium and medium-sulfur discharge port 12 respectively; the high-calcium and high-sulfur particle aging device 8 uses pressure-regulating atomized mixed gas as working gas, and is connected with the dust removal device; the dust removal device outlet and the high-calcium and high-sulfur particle aging device 8 outlet are connected with a high-calcium and high-sulfur discharge port 13.

[0068] Based on the forced rapid hydrolysis and carbonization reaction of CaSO4, CaO and Ca(OH)2, the reaction characteristics of increasing the volume of corresponding particles and reducing the surface energy are used to pre-separate a small amount of large-diameter CFB slag, and then a large amount of medium-diameter CFB slag is separated by using water-containing air flow separation to weaken the combination of calcium-sulfur materials and silicate materials, so that the purpose of efficiently separating calcium-sulfur materials is achieved.

[0069] The method for efficiently separating sulfur and calcium components of high-sulfur circulating fluidized bed coal-fired boiler slag comprises the following specific separation steps:

[0070] S1: selecting circulating fluidized bed coal-fired boiler slag (CFB slag) with high sulfur and calcium content, SO3 content > 3.5wt.%, CaO content > 3.5wt.%;

[0071] S2: flattening the CFB slag into a feed layer with a thickness < 20mm;

[0072] S3: performing low-calcium and low-sulfur particle screening treatment on the CFB slag, and the screening particle size is 1-4 levels, and the smallest screening particle size is not greater than 325 microns;

[0073] S4: the material at the lower outlet of the low-calcium and low-sulfur particle screening device 5 enters the medium-calcium and medium-sulfur particle air separation device 6, and the water content of the working gas required for the air separation device to process unit mass of solid must be controlled, and the maximum water content = the active CaO mass percentage content in unit mass of medium-calcium and medium-sulfur particles × 0.26%;

[0074] S5: The large particles (particles with size not less than 160 microns) selected in the medium calcium and medium sulfur particle air separation device 6 enter the medium calcium and medium sulfur particle screening device 10, and the screened particle size fraction is 1-4, and the minimum size of the screened particle size fraction is not greater than 212 microns;

[0075] S6: The small particles selected in the medium calcium and medium sulfur particle air separation device 6 are collected as medium calcium and medium sulfur particles.

[0076] S7: The material collected by the dust removal device of the medium calcium and medium sulfur particle air separation device 6 is high calcium and high sulfur particles.

[0077] Example 2:

[0078] Different from example 1, the CFB slag with SO3 content of 14.75wt.% and CaO content of 26.60wt.% is selected, the CFB slag is fed with a layer thickness of 20mm, the low calcium and low sulfur particle screening device 5 has 2 particle size fractions, and the minimum size of the particle size fraction is 270 microns, the large particles with size greater than 160 microns are selected in the medium calcium and medium sulfur particle air separation device 6, and finally the low calcium and low sulfur slag with SO3 content of 2.65wt.% and CaO content of 2.41wt.% is obtained, accounting for 50wt.% of the original slag, and the medium calcium and medium sulfur slag accounts for 30wt.% of the original slag.

[0079] Example 3:

[0080] Different from example 1, the CFB slag with SO3 content of 17.49wt.% and CaO content of 26.21wt.% is selected, the CFB slag is fed with a layer thickness of 20mm, the low calcium and low sulfur particle screening device 5 has 4 particle size fractions, and the minimum size of the particle size fraction is 325 microns, the large particles with size greater than 212 microns are selected in the medium calcium and medium sulfur particle air separation device 6, and finally the low calcium and low sulfur slag with SO3 content of 1.99wt.% and CaO content of 2.87wt.% is obtained, accounting for 70wt.% of the original slag, and the medium calcium and medium sulfur slag accounts for 15wt.% of the original slag.

[0081] Example 4:

[0082] Different from example 1, the CFB slag with SO3 content of 7.21wt.% and CaO content of 15.20wt.% is selected, the CFB slag is fed with a layer thickness of 20mm, the low calcium and low sulfur particle screening device 5 has 1 particle size fraction, and the minimum size of the particle size fraction is 500 microns, the large particles with size greater than 160 microns are selected in the medium calcium and medium sulfur particle air separation device 6, and finally the low calcium and low sulfur slag with SO3 content of 3.09wt.% and CaO content of 2.78wt.% is obtained, accounting for 55wt.% of the original slag, and the medium calcium and medium sulfur slag accounts for 35wt.% of the original slag.

[0083] Example 5:

[0084] Different from example 1, the SO3 content of 11.90wt.%, CaO content of 14.33wt.% of CFB slag of thermal power plant is selected, the CFB slag is 20mm, the low calcium and low sulfur particle screening device 5 is divided into 3 levels, the minimum size of particle level is 270 microns, the large particles above 180 microns are selected in the medium calcium and medium sulfur particle air separation device 6, finally the low calcium and low sulfur slag with SO3 content of 1.94wt.% and CaO content of 2.17wt.% accounts for 60wt.% of the original slag, and the medium calcium and medium sulfur slag accounts for 30wt.% of the original slag.

[0085] Example 6:

[0086] Different from example 1, the SO3 content of 17.23wt.%, CaO content of 25.48wt.% of CFB slag of thermal power plant is selected, the CFB slag is 10mm, the low calcium and low sulfur particle screening device 5 is divided into 4 levels, the minimum size of particle level is 325 microns, the large particles above 160 microns are selected in the medium calcium and medium sulfur particle air separation device 6, finally the low calcium and low sulfur slag with SO3 content of 1.60wt.% and CaO content of 1.79wt.% accounts for 65wt.% of the original slag, and the medium calcium and medium sulfur slag accounts for 22wt.% of the original slag.

[0087] Example 7:

[0088] Different from example 1, the SO3 content of 20.17wt.%, CaO content of 24.29wt.% of CFB slag of thermal power plant is selected, the CFB slag is 10mm, the low calcium and low sulfur particle screening device 5 is divided into 2 levels, the minimum size of particle level is 380 microns, the large particles above 160 microns are selected in the medium calcium and medium sulfur particle air separation device 6, finally the low calcium and low sulfur slag with SO3 content of 2.03wt.% and CaO content of 2.63wt.% accounts for 60wt.% of the original slag, and the medium calcium and medium sulfur slag accounts for 25wt.% of the original slag.

[0089] The application discloses a kind of high-sulfur coal circulating fluidized bed slag high-efficiency separation calcium sulfur method and pry installation device, using CaSO4, CaO and Ca (OH) 2 Forced rapid hydrolysis and carbonization reaction, it can increase corresponding particle volume, reduce the reaction characteristics of surface energy, on the basis of a small amount of large particle size CFB slag pre-separation, for a large amount of medium particle size CFB slag using water-containing air flow air separation, weaken calcium sulfur material and silicate material combination, to realize the purpose of efficient separation of calcium sulfur material.The application improves the efficiency of existing screening equipment to handle high-sulfur CFB slag, reduces production cost, improves efficiency;Compared with prior art, the designed equipment is smaller in size, the overall volume can be moved by vehicle, facilitating calcium sulfur separation and treatment of high-sulfur CFB slag at any location, convenient and flexible.

[0090] The present application is not limited to the above-mentioned optional embodiments, and anyone can derive other various forms of products under the inspiration of the present application, but regardless of any changes in shape or structure, any technical solutions falling within the scope defined by the claims of the present application fall within the protection scope of the present application.

Claims

1. A high-efficiency calcium-sulfur separation device for high-sulfur coal circulating fluidized bed slag, characterized in that: It includes a feeding device (3), a dispersing device (4), a low-calcium and low-sulfur particle screening device (5), and a medium-calcium and medium-sulfur particle air separation device (6) connected in sequence. The medium-calcium and medium-sulfur particle air separation device (6) is connected to a first dust removal device (7). It also includes a sample preparation system (1), which is connected to a rapid calcium and sulfur detector (2), a low-calcium and low-sulfur particle screening device (5) and a medium-calcium and medium-sulfur particle air separation device (6) which are respectively connected to the rapid calcium and sulfur detector (2); The medium-calcium and medium-sulfur particle air separation device (6) is connected to the medium-calcium and medium-sulfur particle screening device (10). The medium-calcium and medium-sulfur particle screening device (10) is connected to the low-calcium and low-sulfur discharge port (11) and the medium-calcium and medium-sulfur discharge port (12) respectively. The low-calcium and low-sulfur particle screening device (5) is connected to the low-calcium and low-sulfur discharge port (11). The medium-calcium and medium-sulfur particle air separation device (6) is connected to a first pressure regulating atomizing device (14); the first pressure regulating atomizing device (14) is supplied with tap water by a tap water source (16) and compressed air by a compressed air source (17); the working gas required for the air separation device to process a unit mass of solid is controlled for moisture content, and the maximum moisture content = the percentage of active CaO in a unit mass of medium-calcium and medium-sulfur particles × 0.26%; the medium-calcium and medium-sulfur particle air separation device (6) adopts a gravity air separation device; Based on the pre-separation of a small amount of large-particle-size CFB slag, a large amount of medium-particle-size CFB slag is separated by water-containing airflow classification.

2. The high-efficiency calcium-sulfur separation device for high-sulfur coal circulating fluidized bed slag as described in claim 1, characterized in that: The first dust removal device (7) is connected to a high-calcium and high-sulfur particle aging device (8), and the high-calcium and high-sulfur particle aging device (8) is connected to a second dust removal device (9); it also includes a high-calcium and high-sulfur discharge port (13), which is connected to the second dust removal device (9) and the high-calcium and high-sulfur particle aging device (8) respectively.

3. The high-efficiency calcium-sulfur separation device for high-sulfur coal circulating fluidized bed slag as described in claim 2, characterized in that: The high-calcium and high-sulfur particle aging device (8) is connected to a second pressure regulating atomizing device (15).

4. The high-efficiency calcium-sulfur separation device for high-sulfur coal circulating fluidized bed slag as described in claim 1, characterized in that: The dispersing device (4) is also equipped with a material layer leveling device.

5. The high-efficiency calcium-sulfur separation device for high-sulfur coal circulating fluidized bed slag as described in claim 1, characterized in that: A closing device is provided between the medium-calcium and medium-sulfur particle screening device (10) and the low-calcium and low-sulfur discharge port (11).

6. A method for efficient separation of calcium and sulfur from high-sulfur coal circulating fluidized bed slag, using the high-sulfur coal circulating fluidized bed slag efficient calcium and sulfur separation device according to any one of claims 1 to 5, characterized in that: Includes the following steps: S1: Select CFB slag with high sulfur and calcium content, SO3 content > 3.5 wt.%, CaO content > 3.5 wt.%; S2: Level the CFB slag into a feed layer with a thickness of <20mm; S3: CFB slag is subjected to low-calcium and low-sulfur particle screening, and the screening particle size is divided into 1 to 4 grades. S4: The material from the discharge port of the low-calcium and low-sulfur particle screening device (5) enters the medium-calcium and medium-sulfur particle air classifier (6). The working gas required for the air classifier to process a unit mass of solid controls the moisture content. The maximum moisture content = the percentage of active CaO in a unit mass of medium-calcium and medium-sulfur particles × 0.26%; S5: Large particles selected in the medium-calcium and medium-sulfur particle air classifier (6) enter the medium-calcium and medium-sulfur particle screening device (10), and the screening particle size is divided into 1 to 4 grades; S6: The small particles selected in the medium-calcium and medium-sulfur particle air classifier (6) are collected as medium-calcium and medium-sulfur particles; S7: The material collected by the first dust removal device (7) connected to the medium-calcium and medium-sulfur particle air separation device (6) is high-calcium and high-sulfur particles.

7. The method for efficient separation of calcium and sulfur from high-sulfur coal slag in a circulating fluidized bed as described in claim 6, characterized in that: In step S1, among the CFB slag with a high sulfur and calcium content, the slag with 3.5 wt.% < SO3 < 10 wt.% and 3.5 wt.% < CaO < 10 wt.% is medium calcium and medium sulfur particles, the slag with SO3 > 10 wt.% and CaO > 10 wt.% is high calcium and high sulfur particles, and the rest are low calcium and low sulfur particles.

8. The method for efficient separation of calcium and sulfur from high-sulfur coal slag in a circulating fluidized bed as described in claim 6, characterized in that: The high calcium and high sulfur particles are subjected to aging treatment.

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