Desulfurized fly ash regeneration device and method

Abstract

The invention provides a desulfurization ash regeneration device and method, and relates to the technical field of desulfurization ash regeneration. The device comprises a shell, the shell is provided with a reaction cavity, a feeding port and a discharging port, and a turnover sand core is arranged between the reaction cavity and the discharging port and used for controlling the desulfurization ash discharging process; a gas inlet is formed between the discharge hole and the sand core and is used for introducing reaction gas which reacts with the desulfurized fly ash into the reaction cavity; an ignition device; the circular reaction unit is used for realizing circular reaction of the desulfurized fly ash in the reaction cavity to reach set conditions; and an air outlet. When the device is used for regenerating the desulfurized fly ash, reaction gas can be used as a heat source and a reducing atmosphere at the same time, the desulfurized fly ash is efficiently and quickly regenerated and decomposed into calcium oxide in the reaction cavity, and the energy consumption is reduced; the regenerated desulfurized fly ash can be used in a sintering or pellet production process, so that the treatment cost of waste ash and the use amount of new lime are reduced, and the environmental protection cost and carbon emission of enterprises are effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of desulfurization ash regeneration, and in particular to a desulfurization ash regeneration device and method. Background Art

[0002] At present, a large amount of desulfurization ash is produced every year due to the desulfurization process in the steel industry. According to the draft of the "Solid Waste Classification Catalogue" for 2022, desulfurization ash belongs to general industrial solid waste, which is difficult to treat directly and requires the development of available methods.

[0003] The main component of desulfurized ash is calcium oxide, which can be used to prepare calcium-containing fluxes for sintering pellets such as white lime and slaked lime. However, since desulfurized ash also contains sulfur-containing compounds such as calcium sulfite and calcium sulfate, and the sulfur content is 2% to 11%, it cannot be used directly. The sulfur must be removed first and the desulfurized ash must be regenerated before it can be used. At present, there is no professional desulfurized ash regeneration device to achieve desulfurized ash regeneration. Summary of the invention

[0004] The present application provides a desulfurization ash regeneration device and method to solve the following technical problem: how to provide a desulfurization ash regeneration device.

[0005] In a first aspect, an embodiment of the present application provides a desulfurization ash regeneration device, comprising:

[0006] The shell is provided with a reaction chamber, a feed port and a discharge port, the feed port and the discharge port are both connected to the reaction chamber, and the reaction chamber is used to contain desulfurized ash and perform a regeneration reaction;

[0007] A reversible sand core is arranged between the reaction chamber and the discharge port and is used to control the discharge process of desulfurized ash;

[0008] An air inlet, disposed between the discharge port and the reversible sand core, for introducing gas for reacting with the desulfurized ash into the reaction chamber;

[0009] Ignition device, used to initiate the regeneration reaction of desulfurized ash;

[0010] a circulation reaction unit, which is in communication with the reaction chamber and is used to realize a circulation reaction of the desulfurized ash in the reaction chamber; and

[0011] The gas outlet is used to discharge the gas after the reaction.

[0012] Optionally, the device further includes a desulfurization ash bin, which is connected to the feed port and is used to supply desulfurization ash to the reaction chamber.

[0013] Optionally, the air inlet includes a combustion air inlet and a blast furnace gas inlet.

[0014] Optionally, the cyclic reaction unit comprises:

[0015] A separator, used for separating the desulfurized ash and the gas after the reaction;

[0016] The return device is connected to the separator and is used to recover the desulfurized ash after the reaction.

[0017] Optionally, the separator and the material return device are communicated with the reaction chamber through an upper circulation port and a lower circulation port respectively arranged on the shell.

[0018] Optionally, the exhaust port is arranged at the top of the separator.

[0019] Optionally, the ignition device is arranged below the flippable sand core. The igniter ignites the mixture of blast furnace gas and air to generate a high temperature of more than 1100°C.

[0020] In a second aspect, the present application provides a desulfurization ash regeneration method, which is implemented using the desulfurization ash regeneration device described in the first aspect, and includes the following steps:

[0021] The gas involved in the regeneration reaction enters the reaction chamber through the reversible sand core, and undergoes a high-temperature decomposition reaction with the desulfurized ash to obtain reacted desulfurized ash and reacted gas;

[0022] The desulfurized ash after the reaction is recovered into the reaction chamber to continue the high temperature decomposition reaction to obtain a calcium oxide-containing material;

[0023] When the sulfur content in the calcium oxide-containing material meets the set conditions, the reaction is stopped and the calcium oxide product is recovered;

[0024] The setting condition is: the sulfur content in the calcium oxide-containing material is ≤0.5%.

[0025] Optionally, the gas involved in the regeneration reaction enters the reaction chamber through the reversible sand core and undergoes a high-temperature decomposition reaction with the desulfurized ash to obtain the desulfurized ash and the gas after the reaction, which specifically includes:

[0026] The gas involved in the regeneration reaction enters the reaction chamber through the sand core, and the gas is ignited to heat the reaction chamber to a set temperature;

[0027] Adding desulfurized ash into the reaction chamber to perform a high-temperature decomposition reaction with the gas to obtain reacted desulfurized ash and reacted gas;

[0028] Wherein, the set temperature is 1100°C to 1300°C.

[0029] Optionally, the gas participating in the regeneration reaction includes blast furnace gas and air, and the volume ratio of the blast furnace gas to the air is (3-5):(2-3).

[0030] Optionally, when the sulfur content in the calcium oxide-containing material meets the set conditions, stopping the reaction and recovering the calcium oxide product specifically includes:

[0031] When the sulfur content in the calcium oxide-containing material is not higher than 0.5%, the introduction of the reaction gas is stopped, and the sand core is turned over to recover the calcium oxide product.

[0032] Optionally, the method further includes: using the gas after the reaction to prepare sulfuric acid.

[0033] Optionally, the calcium oxide product is used in a sintering or pelletizing process.

[0034] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0035] The embodiment of the present application provides a desulfurization ash regeneration device and method, the device includes the shell, the shell is provided with a reaction chamber for realizing the desulfurization ash regeneration reaction, a feed port and a discharge port, the feed port and the discharge port are both connected to the reaction chamber, and are used for feeding and discharging processes; a reversible sand core is set between the reaction chamber and the discharge port, which is used to control the desulfurization ash discharging process; an air inlet is set between the discharge port and the sand core, which is used to introduce gas that reacts with the desulfurization ash into the reaction chamber; the sand core structure can make the gas enter the reaction chamber from the bottom during the reaction, and the desulfurization ash will not leak; after the reaction is completed, the sand core can be turned over to realize the discharge process. A circulation reaction unit, the circulation reaction unit is connected to the reaction chamber, and is used to realize the circulation reaction of the desulfurization ash in the reaction chamber to achieve the set conditions; an ignition device, which is used to trigger the regeneration reaction of the desulfurization ash; sulfur dioxide and other post-reaction gases will be generated after the high-temperature decomposition reaction, which need to be discharged through the air outlet.

[0036] The desulfurization ash regeneration device can use the reaction gas as both a heat source and a reducing atmosphere, and efficiently and quickly regenerate the desulfurization ash into calcium oxide in the reaction chamber, thereby reducing energy consumption; the regenerated desulfurization ash can be used in the sintering or pelletizing process, thereby reducing the cost of waste ash treatment and the amount of new lime used, and effectively reducing the environmental protection costs and carbon emissions of the enterprise. The desulfurization ash regeneration device achieves effective regeneration of desulfurization ash through the carefully designed reaction chamber, reversible sand core, air inlet, ignition device, circulating reaction unit and air outlet. In particular, the design of the reversible sand core solves the discharge problem of desulfurization ash caused by incomplete reaction during the regeneration process, ensuring the full progress of the regeneration reaction; the design of the circulating reaction unit further improves the regeneration effect of the desulfurization ash, allowing the device to operate efficiently and stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0039] Figure 1 It is a structural schematic diagram of a desulfurization ash regeneration device according to some embodiments of the present application;

[0040] Among them, the components represented by the reference numerals in the figure are: 1 discharge port, 2 blast furnace gas inlet, 3 combustion air inlet, 4 ignition device, 5 flip sand core, 6 feed port, 7 lower circulation port, 8 desulfurization ash bin, 9 reaction chamber, 10 return device, 11 upper circulation port, 12 separator, 13 gas outlet;

[0041] Figure 2 The present invention is a schematic flow chart of a desulfurization ash regeneration method according to some embodiments of the present application. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0043] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity and should not be understood as a rigid limitation on the scope of the present application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within the range; for example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which applies regardless of the range; in addition, whenever a numerical range is indicated in this document, it is meant to include any cited numbers (fractions or integers) within the indicated range.

[0044] In this document, the terms including "including" and "including" mean "including but not limited to". Relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone; where A and B can be singular or plural. "At least one" means one or more, and "plurality" means two or more; "at least one", "at least one of the following" or similar expressions, refers to any combination of these items, including any combination of single or plural items; for example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple. "Parts" such as parts by weight and parts by mass indicate the proportional relationship between the components. In the proportional relationship involved in this article, the parameters that need to be described by proportion should be understood as the first term of the proportional formula in the order of description, and the proportional numbers should be understood as the second term of the proportional formula. For example, if the mass ratio of substance A, substance B and substance C is 1:2:3, then substance A, substance B and substance C should correspond to the proportional numbers in the proportional formula in the order of description, that is, the mass of substance A: the mass of substance B: the mass of substance C = 1:2:3.

[0045] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this article can be purchased from the market or prepared by existing methods.

[0046] Figure 1 A schematic diagram of a desulfurization ash regeneration device according to some embodiments of the present application

[0047] like Figure 1 As shown, the embodiment of the present application provides a desulfurization ash regeneration device, comprising:

[0048] case,

[0049] The shell is provided with a reaction chamber, a feed port and a discharge port for realizing the desulfurization ash regeneration reaction, and the feed port and the discharge port are both communicated with the reaction chamber;

[0050] A reversible sand core is provided between the reaction chamber and the discharge port to control the desulfurization ash discharge process;

[0051] An air inlet is arranged between the discharge port and the reversible sand core, for introducing gas for reacting with the desulfurized ash into the reaction chamber;

[0052] Ignition device, used to initiate the regeneration reaction of desulfurized ash;

[0053] A circulation reaction unit, the circulation reaction unit is communicated with the reaction chamber and is used to realize a circulation reaction of the desulfurized ash in the reaction chamber;

[0054] The gas outlet is used to discharge the gas after the reaction.

[0055] In the above embodiment, the device includes the shell, which can be configured as a closed container capable of withstanding high temperature, and the shell is provided with a reaction chamber, a feed port and a discharge port for realizing the regeneration reaction of desulfurized ash, the feed port and the discharge port are both communicated with the reaction chamber, and are respectively used for the input and output of desulfurized ash; a reversible sand core is provided between the reaction chamber and the discharge port, which is used for controlling the discharge process of desulfurized ash. This design prevents the desulfurized ash from flowing out of the discharge port when it has not reached the ideal regeneration state, thereby ensuring that the reaction is fully carried out; an air inlet is provided between the discharge port and the sand core, which is used for introducing reaction gas that reacts with the desulfurized ash into the reaction chamber. The design allows the continuous replenishment of reaction gas during the regeneration of desulfurized ash to ensure the continuous reaction; the ignition device is used to trigger the regeneration reaction of desulfurized ash, which is a key component for the startup and operation of the device. Through the ignition device, the regeneration reaction can be quickly started to improve the working efficiency of the device; the circulation reaction unit is connected to the reaction chamber and is used to realize the circulation reaction of desulfurized ash in the reaction chamber. This design can ensure that the desulfurized ash is fully regenerated in the reaction chamber and improve the regeneration effect; the gas outlet is used to discharge the gas after the reaction to ensure the stability of the gas environment inside the device. Through the gas outlet, the concentration and flow of the reaction gas can be monitored and regulated in real time, thereby optimizing the regeneration reaction process. The desulfurized ash regeneration device realizes the effective regeneration of desulfurized ash through the carefully designed reaction chamber, reversible sand core, air inlet, ignition device, circulation reaction unit and gas outlet. In particular, the design of the reversible sand core solves the problem of discharge caused by incomplete reaction of desulfurized ash during the regeneration process, ensuring the full progress of the regeneration reaction. The design of the circulation reaction unit further improves the regeneration effect of desulfurized ash, so that the device can operate efficiently and stably.

[0056] The sand core structure allows the reaction gas to enter the reaction chamber from the bottom during the reaction, and the desulfurized ash will not leak. After the reaction is completed, the sand core can be directly flipped to realize the discharge process. During the reaction, due to the hot air in the reaction chamber, the desulfurized ash enters the fluidized state. The circulating reaction unit is connected to the reaction chamber. The desulfurized ash in the fluidized state enters the circulating reaction unit and then returns to the reaction chamber again, so that the desulfurized ash in the reaction chamber can be circulated and reacted to meet the set conditions. After the high-temperature decomposition reaction, sulfur dioxide and other post-reaction gases will be generated, which need to be discharged through the outlet.

[0057] By using this device to regenerate desulfurized ash, the reaction gas can be used as a heat source and a reducing atmosphere at the same time, and the desulfurized ash can be efficiently and quickly regenerated and decomposed into calcium oxide in the reaction chamber, thereby reducing energy consumption; the regenerated desulfurized ash can be used in the sintering or pelletizing production process, reducing the cost of waste ash treatment and the use of new lime, and effectively reducing the company's environmental protection costs and carbon emissions.

[0058] As an optional implementation, the reversible sand core can be prepared using a quartz sand core.

[0059] As an optional embodiment, the shell can be a circulating fluidized bed, the feed port and the discharge port are arranged at the bottom of the circulating fluidized bed, and the feed port is higher than the discharge port; the circulating reaction unit is arranged on one side of the circulating fluidized bed and is respectively connected to the upper and lower ends of the circulating fluidized bed.

[0060] As an optional embodiment, the device further includes a desulfurization ash bin, which is connected to the feed port and is used to supply desulfurization ash to the reaction chamber.

[0061] In the above embodiment, the device includes a desulfurization ash bin, and the desulfurization ash reactant can be continuously added into the reaction chamber for reaction.

[0062] As an optional implementation, the air inlet includes a combustion air inlet and a blast furnace gas inlet.

[0063] In the above embodiment, a combustion air inlet and a blast furnace gas inlet are provided, the purpose of which is to introduce the combustion air and blast furnace gas as reaction gases into the reaction chamber for reaction. In addition, O2 in the combustion air and CO, CO2 in the blast furnace gas can be used as reaction gases to decompose into CaO with substances such as CaSO4, CaSO3, CaCO3 in the desulfurization ash to complete the regeneration of the desulfurization ash, and can also be ignited by an ignition device as a heat source to raise the temperature in the reaction chamber to the reaction temperature, thereby reducing energy consumption.

[0064] As an optional embodiment, the cyclic reaction unit comprises:

[0065] A separator, used for separating the desulfurized ash and the gas after the reaction;

[0066] The return device is connected with the separator and is used for recovering the desulfurized ash after the reaction.

[0067] In the above embodiment, the circulating reaction unit serves as a circulating reaction device, and the reacted desulfurization ash and reacted gas flow upward under the action of hot air and enter the separator. After the separator separates the reacted desulfurization ash and the reacted gas, the reacted desulfurization ash falls into the return material return device due to gravity, and then enters the reaction chamber again; the reacted gas is directly discharged.

[0068] As an optional implementation, the separator and the material returner are communicated with the reaction chamber through an upper circulation port and a lower circulation port respectively arranged on the shell.

[0069] In the above embodiment, the desulfurized ash and the gas after the reaction enter the separator through the upper circulation port, and the desulfurized ash or calcium oxide-containing material in the return device returns to the reaction chamber through the lower circulation port.

[0070] As an optional implementation, the exhaust port is arranged at the top of the separator.

[0071] In the above embodiment, the advantage of arranging the exhaust port at the top of the separator is that the reacted gas separated by the separator can be directly discharged from the exhaust port without exhausting the gas participating in the reaction.

[0072] As an optional embodiment, the ignition device is arranged below the flippable sand core, corresponding to the air inlet, so as to ignite the combustion air and blast furnace gas released from the air inlet, and heat the reaction chamber to the reaction temperature.

[0073] In the above embodiment, the ignition device is arranged below the sand core. The reason is that during the reaction, there is too much dust in the reaction chamber, and the ignition device can be prevented from being blocked by dust, which would affect the regeneration reaction process.

[0074] In a second aspect, the present application provides a desulfurization ash regeneration method, which is implemented using the desulfurization ash regeneration device described in the first aspect, such as Figure 2 As shown, the following steps are included:

[0075] S1. The gas involved in the regeneration reaction enters the reaction chamber through the reversible sand core, and undergoes a high-temperature decomposition reaction with the desulfurized ash to obtain reacted desulfurized ash and reacted gas;

[0076] S2, recovering the desulfurized ash after the reaction into the reaction chamber to continue the high-temperature decomposition reaction to obtain a calcium oxide-containing material;

[0077] S3. When the sulfur content in the calcium oxide-containing material meets the set conditions, stop the reaction and recover the calcium oxide product;

[0078] The setting condition is: the sulfur content in the calcium oxide-containing material is ≤0.5%.

[0079] In the above embodiment, the gas involved in the reaction undergoes a high-temperature decomposition reaction with the desulfurization ash, and the substances such as CaSO4, CaSO3, and CaCO3 in the desulfurization ash are decomposed into CaO and sulfur dioxide. During the reaction, the desulfurization ash cannot react completely at one time, so it is necessary to recover the desulfurization ash after one reaction through a circulation recovery device, and continue to react in the reaction chamber to obtain a calcium oxide-containing material; during the process, the sulfur content in the calcium oxide-containing material is continuously measured until the sulfur content meets the set requirements and the reaction is stopped to obtain the final calcium oxide product. The method uses a reversible sand core as a channel for gas introduction, so that the gas can enter the reaction chamber evenly and stably, and undergo a sufficient high-temperature decomposition reaction with the desulfurization ash; this design not only improves the reaction efficiency, but also avoids local accumulation of gas in the reaction chamber and safety hazards; high-temperature decomposition reaction is a key step in the regeneration of desulfurization ash; the method achieves rapid decomposition of harmful substances such as calcium sulfate and calcium sulfite in the desulfurization ash by precisely controlling the reaction temperature and gas flow rate, and generates calcium oxide and other harmless gas products. The method recycles the desulfurized ash after the reaction into the reaction chamber through the circulation reaction unit, and continues the high-temperature decomposition reaction; the design of this circulation reaction not only improves the regeneration efficiency of the desulfurized ash, but also ensures that the materials in the reaction chamber can fully utilize the reaction gas and avoid waste of resources; the circulation reaction also enables the materials in the reaction chamber to maintain certain temperature and pressure conditions, which is conducive to the continuous reaction and the stable generation of products. The method uses sulfur content as an important basis for judging whether the reaction has stopped; by regularly detecting the sulfur content in the calcium oxide-containing material in the reaction chamber, the regeneration degree of the desulfurized ash can be accurately judged to ensure the quality and safety of the product; when the sulfur content meets the set conditions (≤0.5%), the reaction is stopped and the calcium oxide product is recovered; this design not only ensures that the sulfur content of the product meets the relevant standards, but also improves the added value and market competitiveness of the product.

[0080] In summary, the desulfurization ash regeneration method shows high creativity in gas introduction, high-temperature decomposition reaction, circulation reaction, sulfur content detection and product recovery. Through a series of innovative designs and steps, the method achieves efficient and continuous regeneration of desulfurization ash and obtains high-quality calcium oxide products. The emergence of this method not only solves the environmental pollution problem in the desulfurization ash treatment process, but also provides new ideas and ways for the effective utilization of resources. Therefore, the desulfurization ash regeneration method has high patent creativity and practical value.

[0081] As an optional implementation, the gas involved in the reaction enters the reaction chamber through the reversible sand core, undergoes a high-temperature decomposition reaction with the desulfurized ash, and obtains the calcium oxide-containing material and the reacted gas, specifically comprising:

[0082] The gas involved in the reaction enters the reaction chamber through the sand core, and the gas is ignited to heat the reaction chamber to a set temperature;

[0083] Adding desulfurized ash into the reaction chamber to perform a high-temperature decomposition reaction with the gas to obtain reacted desulfurized ash and reacted gas;

[0084] Wherein, the set temperature is 1100°C to 1300°C.

[0085] In the above embodiment, the purpose of allowing the gas involved in the reaction to enter the reaction chamber through the sand core is not only to allow the reaction gas to enter the reaction chamber, but also to ensure that the desulfurized ash will not leak; igniting the gas can heat the reaction chamber to a set temperature, and can also make the desulfurized ash and the gas mix evenly under the action of hot air, thereby achieving a high-temperature decomposition reaction to obtain the desulfurized ash and the gas after the reaction. Exemplarily, the set temperature can be 1100°C, 1150°C, 1200°C, 1250°C or 1300°C.

[0086] As an optional embodiment, the gas participating in the reaction includes blast furnace gas and air, and the volume ratio of the blast furnace gas to the air is (3-5):(2-3).

[0087] In the above embodiment, blast furnace gas and air are selected as reaction gases because they can be ignited and used as both heat sources and reactants. At the same time, blast furnace gas is used as a raw material, and the tail gas in the coal production process can be directly used, reducing the cost of tail gas treatment while reducing tail gas emissions. The use of air for combustion is low in cost and high in efficiency. The volume ratio of the blast furnace gas and the air is controlled to be (3 to 5): (2 to 3) because the volume ratio within this range can meet the needs of both the combustion process and the high-temperature decomposition reaction. Exemplarily, the volume ratio of the gas and the air can be 3:3, 4:3, 3:2, 5:3, 4:2 or 5:2.

[0088] As an optional implementation manner, when the sulfur content in the calcium oxide-containing material meets the set conditions, stopping the reaction and recovering the calcium oxide product specifically includes:

[0089] When the sulfur content in the calcium oxide-containing material is not higher than 0.5%, the introduction of reaction gas, ie, combustion air and blast furnace gas, is stopped, and the sand core is directly turned over to a vertical state to recover the calcium oxide product.

[0090] In the above embodiment, when the sulfur content in the calcium oxide-containing material is not higher than 0.5%, the regeneration standard of the desulfurized ash is met, and the reaction is stopped at this time. When the reaction is stopped, the introduction of the reaction gas is first stopped, and then the sand core is directly turned over, and the desulfurized ash that has reacted completely in the reaction chamber, that is, the calcium oxide product, is directly discharged from the discharge port.

[0091] As an optional implementation, the method further comprises: using the gas after the reaction to prepare sulfuric acid.

[0092] In the above embodiment, about 10% of the gas after the reaction is sulfur dioxide gas, and the gas can be transported to a later acid production system through a pipeline for preparing sulfuric acid.

[0093] As an optional embodiment, since the sulfur content in the calcium oxide product is less than 0.5%, it can be used in sintering or pelletizing production processes.

[0094] The present application is further described below in conjunction with specific examples. The experimental methods in the following examples where specific conditions are not specified are usually measured in accordance with national standards / industry standards; if there are no corresponding national standards / industry standards, they are measured in accordance with common international standards, conventional conditions or conditions recommended by the manufacturer.

[0095] Example 1

[0096] This embodiment provides a desulfurization ash regeneration device, such as Figure 2 As shown, including:

[0097] A shell, wherein the shell may adopt a circulating fluidized bed;

[0098] The shell is provided with a reaction chamber, a feed port and a discharge port for realizing the desulfurization ash regeneration reaction, and the feed port and the discharge port are both communicated with the reaction chamber;

[0099] The discharge port is arranged at the bottom of the reaction chamber, and a reversible sand core is arranged between the reaction chamber and the discharge port to control the desulfurization ash discharge process;

[0100] A combustion air inlet and a blast furnace gas inlet are arranged between the discharge port and the sand core, the purpose of which is to pass the combustion air and blast furnace gas as reaction gases into the reaction chamber for reaction;

[0101] An ignition device, arranged below the reversible sand core, for igniting combustion-supporting air and blast furnace gas to heat the reaction chamber to a set temperature;

[0102] A circulation reaction unit, the circulation reaction unit comprising a separator, a returner, an upper circulation port and a lower circulation port, the separator and the returner are connected, and are communicated with the reaction chamber through the upper circulation port and the lower circulation port respectively, for realizing a circulation reaction of the desulfurized ash in the reaction chamber;

[0103] The gas outlet is arranged at the top of the separator and is used to discharge the gas after the reaction.

[0104] Example 2

[0105] This embodiment provides a desulfurization ash regeneration method, comprising the following steps:

[0106] Blast furnace gas and air are introduced into the reaction chamber through a reversible sand core in a volume ratio of 3:2, the blast furnace gas and air are ignited, and the temperature in the reaction chamber is raised to 1100°C;

[0107] The blast furnace gas and air are subjected to high temperature decomposition reaction with the desulfurized ash. The ratio of desulfurized ash to blast furnace gas and air is 1 kg of desulfurized ash corresponding to 1 m 3 The blast furnace gas and air are reacted to obtain reacted desulfurized ash and reacted gas;

[0108] The desulfurized ash and the gas after the reaction enter the separator through the upper circulation port for separation, and the gas after the reaction is discharged through the exhaust port; the desulfurized ash after the reaction is recovered to the reaction chamber through the return device and the lower circulation port to continue the high-temperature decomposition reaction to obtain a calcium oxide-containing material;

[0109] When the sulfur content in the calcium oxide-containing material meets the sulfur content requirement of less than 0.5%, the introduction of blast furnace gas and air is stopped, the sand core is turned over, and the calcium oxide product is recovered.

[0110] According to calculation, the energy consumed in regenerating 1kg of desulfurized ash in this method is 1.9MJ.

[0111] Comparative Example

[0112] This comparative example provides a desulfurization ash regeneration method, comprising the following steps:

[0113] The desulfurized ash is heated and decomposed by a plasma emitter to obtain sulfur dioxide and calcium oxide-containing materials;

[0114] The calcium oxide-containing material is recycled to prepare ironmaking furnace charge, thereby completing the resource utilization of desulfurization ash.

[0115] In this comparative example, plasma is used as a heating source to heat the desulfurized ash to 1000°C for decomposition. According to calculations, the energy consumed in regenerating 1 kg of desulfurized ash using the desulfurized ash regeneration method provided in this comparative example is approximately 3.7 MJ.

[0116] In summary, the desulfurization ash regeneration device and method provided in the present application can utilize the surplus blast furnace gas of the steel plant as a heat source and reducing atmosphere, and efficiently and quickly regenerate the desulfurization ash into calcium oxide in the reaction chamber (circulating fluidized bed). The energy consumed to regenerate 1 kg of desulfurization ash is approximately 1.9 MJ, which is 48% lower than the energy consumption in the control example; the regenerated desulfurization ash is returned to sintering or pelletizing for use, reducing the waste ash treatment costs and the use of new lime, effectively reducing the company's environmental protection costs and carbon emissions.

[0117] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. It will be apparent to those skilled in the art that various modifications to these embodiments are possible, and the general principles defined in the present application can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown in the present application, but will conform to the widest scope consistent with the principles and novel features applied for by the present application.

Claims

1. A desulfurization ash regeneration device, comprising: The shell is provided with a reaction chamber, a feed port and a discharge port, the feed port and the discharge port are both connected to the reaction chamber, and the reaction chamber is used to contain desulfurized ash and perform a regeneration reaction; A reversible sand core is arranged between the reaction chamber and the discharge port and is used to control the discharge process of desulfurized ash; An air inlet, disposed between the discharge port and the reversible sand core, for introducing gas for reacting with the desulfurized ash into the reaction chamber; Ignition device, used to initiate the regeneration reaction of desulfurized ash; a circulation reaction unit, which is in communication with the reaction chamber and is used to realize a circulation reaction of the desulfurized ash in the reaction chamber; and The gas outlet is used to discharge the gas after the reaction.

2. The desulfurization ash regeneration device according to claim 1, further comprising a desulfurization ash bin, the desulfurization ash bin being connected to the feed inlet and being used to supply desulfurization ash to the reaction chamber; and / or The air inlet includes a combustion air inlet and a blast furnace gas inlet.

3. The desulfurization ash regeneration device according to claim 1, wherein the circulation reaction unit comprises: A separator, used for separating the desulfurized ash and the gas after the reaction; as well as The return device is connected to the separator and is used to recover the desulfurized ash after the reaction.

4. The desulfurized ash regeneration device according to claim 3, wherein the separator and the material return device are connected to the reaction chamber through an upper circulation port and a lower circulation port provided on the shell, respectively; and / or The exhaust port is arranged at the top of the separator.

5. According to the desulfurization ash regeneration device according to claim 1, the ignition device is arranged below the reversible sand core.

6. A desulfurization ash regeneration method, implemented by the desulfurization ash regeneration device according to any one of claims 1 to 5, comprising the following steps: The gas involved in the regeneration reaction enters the reaction chamber through the reversible sand core, and undergoes a high-temperature decomposition reaction with the desulfurized ash to obtain reacted desulfurized ash and reacted gas; The desulfurized ash after the reaction is recovered into the reaction chamber to continue the high temperature decomposition reaction to obtain a calcium oxide-containing material; When the sulfur content in the calcium oxide-containing material meets the set conditions, the reaction is stopped and the calcium oxide product is recovered; The setting condition is: the sulfur content in the calcium oxide-containing material is ≤0.5%.

7. The desulfurized ash regeneration method according to claim 6, wherein the gas participating in the regeneration reaction enters the reaction chamber through the reversible sand core, undergoes a high-temperature decomposition reaction with the desulfurized ash, and obtains the desulfurized ash and the gas after the reaction, which specifically comprises: The gas involved in the regeneration reaction enters the reaction chamber through the reversible sand core, and the gas is ignited to heat the reaction chamber to a set temperature; Adding desulfurized ash into the reaction chamber to perform a high-temperature decomposition reaction with the gas to obtain reacted desulfurized ash and reacted gas; Wherein, the set temperature is 1100°C to 1300°C.

8. According to the desulfurization ash regeneration method of claim 7, the gas involved in the regeneration reaction includes blast furnace gas and air, and the volume ratio of the blast furnace gas to the air is (3-5):(2-3).

9. The desulfurization ash regeneration method according to claim 6, wherein when the sulfur content in the calcium oxide-containing material meets the set conditions, the reaction is stopped and the calcium oxide product is recovered, which specifically comprises: When the sulfur content in the calcium oxide-containing material is not higher than 0.5%, the gas supply is stopped and the sand core is turned over to recover the calcium oxide product.

10. The desulfurization ash regeneration method according to claim 6, further comprising: The gas after the reaction is used to prepare sulfuric acid; and / or The calcium oxide product is used in sintering or pelletizing processes.

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