Method for improving roasting efficiency of gasified filter residues and application

Abstract

The invention belongs to the technical field of gasification filter residues, and relates to a method for improving the roasting efficiency of gasification filter residues and application. The method comprises the steps that oil residue gasification filter residues are obtained, the oil residue gasification filter residues fall into a shredding machine to be crushed after being unpacked by ton bags, the crushed filter residues enter a Z-shaped bucket elevator to be lifted and sent into a raw material bin to be temporarily stored, then the filter residues are lifted to a proper height through a Z-shaped feeding bucket elevator, and the filter residues are distributed into a multi-section roasting furnace through a feeding turning plate to be roasted; the roasted filter residues enter an inclined spiral cooling conveyor to be cooled, and the cooled filter residues are conveyed to a finished product bin; and flue gas generated in the roasting process enters a cyclone separator to be treated. The method is applied to a gasification filter residue roasting device. According to the gasification filter residue roasting device, efficient treatment of filter residues is achieved, energy consumption and environmental pollution in the roasting process are reduced, the durability and stability of equipment operation are improved, and the gasification filter residue roasting efficiency is overall improved.

Description

Technical Field

[0001] The invention belongs to the technical field of gasification filter residue, and in particular, relates to a method and application for improving the roasting efficiency of gasification filter residue. Background Art

[0002] In industrial production, the treatment of oil residue gasification residue has always been a difficult problem. As a byproduct of gasification, oil residue residue contains a large amount of organic and inorganic matter, usually with a high carbon content and certain hazards. Traditional treatment methods are mostly direct landfill or simple incineration, but these treatment methods have the following problems: Serious pollution: Simple incineration will produce a large amount of harmful gases, such as sulfur dioxide, nitrogen oxides and other volatile organic compounds, which are extremely harmful to the environment.

[0003] Waste of resources: Oil residue filter residue contains certain usable energy and metal components. Traditional treatment methods fail to effectively utilize these resources, resulting in waste.

[0004] Incomplete treatment: The filter residue material is complex and simple incineration or landfill cannot achieve complete harmless treatment, especially the heavy metal components in it may cause pollution to the soil and groundwater. Summary of the invention

[0005] Purpose of the invention: In view of the shortcomings of the prior art, the purpose of the present invention is to provide a method and application for improving the roasting efficiency of gasification filter residue.

[0006] Technical solution: In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is as follows: 1. Methods for improving the roasting efficiency of gasification filter residue The method for improving the roasting efficiency of gasified filter residue comprises the following steps: the gasified filter residue of oil residue is unpacked from a ton bag and falls into a shredder, the shredder performs preliminary crushing on the gasified filter residue of oil residue, the crushed filter residue enters a Z-type bucket elevator, the Z-type bucket elevator lifts the crushed filter residue and sends it to a raw material silo for temporary storage, the temporarily stored filter residue is lifted to a height suitable for entering a multi-stage roasting furnace by a Z-type feed bucket elevator, the lifted filter residue is distributed to a multi-stage roasting furnace through a feed flap for roasting, the roasted filter residue is discharged from the multi-stage roasting furnace, enters an inclined spiral cooling conveyor for cooling treatment, and the cooled filter residue is transported to a finished product silo; the smoke generated during the roasting process enters a cyclone separator for treatment.

[0007] In one embodiment, the following steps are also included: a cyclone separator performs preliminary dust removal on the flue gas generated by roasting, a portion of the flue gas discharged by the cyclone separator enters the afterburner chamber for secondary combustion, and an SNCR system is also used in the afterburner chamber to spray ammonia water into the afterburner chamber to remove nitrogen oxides; the flue gas discharged from the afterburner chamber enters the waste heat boiler, and the waste heat boiler uses the heat of the flue gas to generate steam.

[0008] In one embodiment, the following steps are also included: the remaining flue gas enters a quenching tower after coming out of the waste heat boiler, and the temperature of the flue gas is cooled by soft water spraying. The flue gas cooled in the quenching tower enters a bag filter to remove fine particles in the flue gas.

[0009] In one embodiment, the following steps are also included: the flue gas after dust removal by the bag filter enters the SCR to remove nitrogen oxides, the flue gas from the SCR enters the GGH to recover the heat of the flue gas, the flue gas after heat exchange in the GGH is pushed to the water washing and cooling tower by the induced draft fan, the water washing and cooling tower washes and cools the flue gas to remove harmful components remaining in the flue gas, the cooled flue gas enters the deacidification tower for deacidification, the deacidified flue gas enters the GGH again to recover the remaining heat, and is finally discharged through the chimney.

[0010] In one embodiment, the following steps are also included: another part of the flue gas discharged from the cyclone separator enters the low-temperature economizer, exchanges heat with the deoxygenated water, and recovers the low-temperature waste heat in the flue gas; part of the flue gas discharged from the low-temperature economizer enters the waste heat boiler, and part is sent back to the multi-stage roasting furnace through the back-mixing fan to supplement the flue gas circulation in the multi-stage roasting furnace and maintain heat balance.

[0011] It should be noted that the present invention uses gasification filter residue waste as raw material, utilizes a multi-stage roasting furnace to oxidize and roast the material, and effectively controls the temperature, residence time and oxygen content of different layers in the multi-stage roasting furnace in layers, so that the waste undergoes a series of physical and chemical processes such as drying, metal oxidation and charcoal incineration, and oxidizes and roasts the organic matter in the waste, while converting the metal elements into oxides, and controls the roasting temperature to suppress the volatilization loss of some metals. The waste heat of the flue gas generated by the multi-stage roasting furnace can be used to produce waste heat steam for recycling, and it is equipped with an advanced flue gas system for purification and disposal.

[0012] In one embodiment, fuel gas and air are also introduced into the afterburner, and fuel gas and external air are also introduced into the multi-stage roasting furnace.

[0013] In one embodiment, soft water is also introduced into the inclined spiral cooling conveyor, and corrosion inhibitors are added to the soft water. The corrosion inhibitors include phosphates, molybdates, and modified corrosion inhibitors.

[0014] In one embodiment, the preparation method of the modified corrosion inhibitor comprises the following steps: Molybdenum powder is added to a sodium hydroxide solution, heated, and stirred to obtain a sodium molybdate solution. Ethanolamine is added to the sodium molybdate solution, and stirring is continued. Then, sodium polyacrylate is added and stirred until it is completely dissolved to obtain a modified corrosion inhibitor.

[0015] In one embodiment, the preparation method of the modified corrosion inhibitor comprises the following steps: Molybdenum powder is added to a sodium hydroxide solution, heated, and stirred to obtain a sodium molybdate solution, ethanolamine is added to the sodium molybdate solution, stirring is continued, and then sodium polyacrylate is added and stirred until completely dissolved to obtain a mixed solution, and then tea polyphenols are added to the mixed solution, stirred and heated, and then flavonoid compounds are added and stirred until completely dissolved, and then a phosphate derivative is added and mixed evenly to obtain a modified corrosion inhibitor.

[0016] (II) Application The method for improving the roasting efficiency of gasification filter residue is applied in a gasification filter residue roasting device, which includes a shredder, the shredder is connected to a raw material bin via a Z-type bucket elevator, the raw material bin is connected to a feed flap via a Z-type feed bucket elevator, the feed flap is connected to a multi-stage roasting furnace, and the multi-stage roasting furnace is connected to a finished product bin via an inclined spiral cooling conveyor; The multi-stage roasting furnace is also connected to the afterburner through a cyclone separator, the afterburner is connected to the quench tower through a waste heat boiler, the quench tower is connected to the SCR through a bag filter, the SCR is connected to the induced draft fan through GGH, the induced draft fan is connected to the deacidification tower through a water washing and cooling tower, and the deacidification tower is connected to the chimney through GGH; In addition, the afterburner is also connected to the SNCR; the cyclone separator is also connected to the return mixing fan through the low-temperature economizer, the return mixing fan is connected to the multi-stage roasting furnace, and the low-temperature economizer is also connected to the waste heat boiler.

[0017] It should be noted that in the device, the material is transported to the top furnace bed of the multi-stage roasting furnace by the feeding system. The temperature of each bed layer is set by adjusting the burner control valve, and the air-fuel ratio is accurately controlled to ensure the combustion effect; the oxygen content of each furnace layer is accurately controlled by air supply and flue gas backmixing control, and the oxidation heat release rate is controlled; the temperature of each furnace layer is controlled in layers to suppress the volatilization and decomposition of heavy metals while meeting the heavy metal roasting efficiency; at the same time, the incineration efficiency of residual carbon and organic matter is improved, and the heat consumption of the system is reduced. The flue gas generated by the roasting of the multi-stage roasting furnace is recycled through the afterburner and the flue gas purification device, and the harmful gases and dust such as CO, Sox, NOx in the flue gas are further removed, and enter the chimney for venting after meeting the emission requirements.

[0018] (III) Advantages Compared with the prior art, the beneficial effects or advantages of the present invention are: First, the roasting efficiency is significantly improved: by adopting a multi-stage roasting furnace and independent temperature control, each roasting stage can set the appropriate temperature and oxygen concentration according to the reaction requirements of the material at different stages, thereby achieving a more accurate roasting process. Compared with the existing technology, this method makes the various stages of the filter residue roasting more uniform and thorough, thereby improving the overall roasting efficiency and combustion effect. By setting up a low-temperature economizer and a back-mixing fan, the recycling of flue gas is realized, and the waste heat in the roasting process can be recovered and reused, reducing fuel consumption and improving energy utilization.

[0019] Second, energy consumption reduction and energy recycling: By combining the afterburner with the waste heat boiler, the waste heat of the roasting flue gas is used to generate steam, which not only improves the energy utilization efficiency, but also reduces the dependence on external energy. The quenching tower is combined with the low-temperature economizer to effectively prevent the secondary generation of harmful substances through rapid cooling and waste heat recovery, and improve the recovery rate of heat energy, reducing overall energy consumption.

[0020] Third, effectively reduce pollutant emissions: The high-temperature flue gas generated during the roasting process is initially dusted by a cyclone separator, and then secondary combustion is carried out in the afterburner, which can effectively remove incompletely burned volatile organic compounds and reduce the emission of harmful substances. By adopting the combined treatment technology of SCR (selective catalytic reduction) and SNCR (selective non-catalytic reduction), the nitrogen oxide content in the flue gas is further reduced, and the overall environmental performance is improved. In addition, the deacidification tower removes the acidic components in the flue gas to ensure that the flue gas emissions meet environmental protection requirements.

[0021] Fourth, equipment durability and operational stability are improved: a deaerator is introduced into the inclined spiral cooling conveyor to treat soft water, reduce the oxygen content in the water, effectively prevent the corrosion of cooling equipment caused by oxygen, and extend the service life of the cooling system. By adding corrosion inhibitors to soft water and further optimizing them into modified corrosion inhibitors, a dense multi-layer protective film is formed on the metal surface, which effectively prevents corrosion damage to the equipment in high temperature and high humidity environments, and improves the operational reliability and service life of the equipment.

[0022] Fifth, the present invention realizes the automatic and continuous processing of oil residue gasification filter residue, reduces manual intervention, improves the stability and continuity of the entire production process, and effectively reduces production costs and operational complexity.

[0023] In summary, compared with the prior art, the technical solution of the present invention has made significant progress in terms of improving the efficiency of gasification filter residue roasting, reducing energy consumption, stability of equipment operation, environmental protection and new energy, etc. The method of the present invention combined with its application not only realizes the efficient treatment of filter residue, but also reduces energy consumption and environmental pollution during the roasting process, improves the durability and stability of equipment operation, and generally improves the efficiency of gasification filter residue roasting. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. The drawings described below are only drawings corresponding to some embodiments of the present invention.

[0025] Figure 1 The present invention is a schematic flow chart of a method for improving the roasting efficiency of gasified filter residue and its application.

[0026] Markings in the figure are: 1. Ton bag unpacking; 2. Shredder; 3. Z-type bucket elevator; 4. Raw material silo; 5. Z-type feed hopper elevator; 6. Feed flap; 7. Multi-stage roasting furnace; 8. Inclined spiral cooling conveyor; 9. Finished product silo; 10. Deaerator; 11. Cyclone separator; 12. Afterburner; 13. Waste heat boiler; 14. Rapid cooling tower; 15. Bag filter; 16. SCR; 17. GGH; 18. Induced draft fan; 19. Water washing and cooling tower; 20. Deacidification tower; 21. Chimney; 22. SNCR; 23. Low-temperature economizer; 24. Back-mixing fan. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] 1. Methods and applications for improving the roasting efficiency of gasification filter residue.

[0030] The method for improving the efficiency of gasification filter residue roasting is applied in a gasification filter residue roasting device, and a specific embodiment is given below: Example 1 Reference Figure 1The gasification filter residue roasting device includes oil residue gasification filter residue, which falls into a shredder after being unpacked from a ton bag 1. The ton bag unpacking machine 1 is used for unpacking the ton bag. The ton bag unpacking machine is connected to the shredder 2 by pipeline. The shredder 2 performs preliminary crushing treatment on the oil residue gasification filter residue for subsequent roasting treatment. The shredder 2 is connected to the Z-type bucket elevator 3 by pipeline. The Z-type bucket elevator 3 is connected to the raw material silo 4 by pipeline. The raw material silo 4 is connected to the Z-type feed bucket elevator 5 by pipeline. The Z-type feed bucket elevator 5 is connected to the feed flap 6 by pipeline. The feed flap 6 can be a flap feed valve or a matching flipper.

[0031] The feed flap 6 is connected to the multi-stage roasting furnace 7 by pipeline, and the multi-stage roasting furnace 7 is connected to the inclined spiral cooling conveyor 8 by pipeline. The inclined spiral cooling conveyor 8 can be an inclined cooling spiral conveyor or an inclined water-cooled spiral conveyor. The inclined spiral cooling conveyor 8 is connected to the finished product silo 9 by pipeline. Among them, fuel gas and external air are introduced into the multi-stage roasting furnace 7. The external air is the air supplemented by the external supplement, and the purpose is to adjust the air supply in the multi-stage roasting furnace 7 to ensure the combustion intensity therein. Soft water is also introduced into the inclined spiral cooling conveyor 8, and the inclined spiral cooling conveyor 8 is also connected to the deaerator 10 by pipeline.

[0032] The oil residue gasification residue roasted in the multi-stage roasting furnace 7 is cooled by the inclined spiral cooling conveyor 8. The cooling process is heat exchanged by passing soft water, and the cooled oil residue gasification residue is transported to the finished product silo 9 for storage. In addition, the inclined spiral cooling conveyor 8 is also connected to the deaerator 10 through a pipeline for deoxygenation of soft water to prevent corrosion of the cooling equipment.

[0033] The multi-stage roasting furnace 7 is also connected to the cyclone separator 11 in a pipeline manner. The cyclone separator 11 performs preliminary dust removal on the flue gas generated by the roasting furnace. The flue gas after dust removal has two processing routes, that is, the cyclone separator 11 has two connection routes: The first route: The cyclone separator 11 is connected to the afterburner 12 by pipeline. The afterburner 12 can effectively reduce the emission of volatile organic compounds and can be purchased from SECO / WARWICK Group.

[0034] The afterburner 12 is connected to the waste heat boiler 13 by pipeline. On the one hand, the waste heat boiler 13 discharges steam. On the other hand, the waste heat boiler 13 is also connected to the quench tower 14 by pipeline. The quench tower 14 is connected to the bag filter 15 by pipeline. The bag filter 15 is connected to the SCR 16 (selective catalytic reduction) by pipeline. The SCR 16 adopts an SCR reactor. The SCR 16 is connected to the GGH 17 by pipeline. The GGH 17 adopts an air-to-air heat exchanger. The GGH 17 is connected to the induced draft fan 18 by pipeline. The induced draft fan 18 is connected to the water washing and cooling tower 19 by pipeline. The water washing and cooling tower 19 can be a water washing tower. The water washing and cooling tower 19 is connected to the deacidification tower 20 by pipeline. The deacidification tower 20 is also connected to the GGH 17 by pipeline. The GGH 17 is also connected to the chimney 21 by pipeline. The SNCR 22 (selective non-catalytic reduction method) is also connected to the afterburner 12. The SNCR 22 can use an SNCR reactor. The SNCR 22 discharges ammonia into the afterburner.

[0035] The fuel gas and air enter the afterburner 12 , and the soft water enters the quench tower 14 .

[0036] The second route: the cyclone separator 1 is connected to the low-temperature economizer 23 by pipeline, the low-temperature economizer 23 is connected to the back-mixing fan 24 by pipeline, the back-mixing fan 24 is connected to the multi-stage roasting furnace 7 by pipeline, and the back-mixing fan 24 transports the back-mixed flue gas to the multi-stage roasting furnace 7. The low-temperature economizer 23 is also connected to the waste heat boiler 13 by pipeline. Among them, the deoxygenated water enters the low-temperature economizer 23.

[0037] The method of improving the roasting efficiency of gasification filter residue is reflected in the specific process. The specific process steps are as follows: 1. Raw material preparation and pretreatment The oil residue gasification filter residue (hereinafter referred to as filter residue) is first stored in a ton bag, and the ton bag unpacking machine is used to unpack the ton bag, and the filter residue is poured out of the ton bag. The unpacked filter residue falls into the shredder 2 through the pipeline. The shredder 2 performs preliminary crushing on the oil residue gasification filter residue to ensure that the particle size of the filter residue meets the requirements of the subsequent roasting treatment. The crushed filter residue enters the Z-type bucket elevator 3 through the pipeline. The function of the Z-type bucket elevator 3 is to lift the crushed filter residue to a higher height for subsequent processing steps. The lifted filter residue is sent to the raw material silo 4 for storage. The raw material silo 4 is used to temporarily store the filter residue to ensure the continuity of material supply, and at the same time provide a stable source of materials for the subsequent Z-type feed bucket elevator 5. The filter residue in the raw material silo 4 is lifted to a height suitable for entering the multi-stage roasting furnace 7 by the Z-type feed bucket elevator 5. The lifted filter residue enters the feed flap 6 through the pipeline. The feed flap 6 is used to evenly distribute the filter residue into the multi-stage roasting furnace 7 to ensure the uniformity and stability of material supply.

[0038] 2. Calcination The filter residue enters the multi-stage roasting furnace 7, which is divided into multiple roasting sections. The temperature of each section can be controlled separately to achieve the gradual decomposition and gasification of the filter residue. Fuel gas and external air are introduced into the multi-stage roasting furnace 7 to maintain a suitable combustion temperature and roasting atmosphere to ensure that the filter residue is fully roasted.

[0039] The calcined filter residue is discharged from the multi-stage calcining furnace 7 and enters the inclined spiral cooling conveyor 8 for cooling. The cooling process is carried out by passing soft water for heat exchange to ensure that the temperature of the filter residue is reduced to a level suitable for storage and subsequent processing. The cooled filter residue is transported to the finished product silo 9 for further storage and subsequent industrial use. The inclined spiral cooling conveyor 8 is connected to the deaerator 10, which is used to treat the soft water entering the inclined spiral cooling conveyor 8 to prevent the corrosion of the equipment by the oxygen contained in the water.

[0040] The high-temperature flue gas generated during the roasting process enters the cyclone separator 11 through a pipeline for further treatment: 3. Flue gas treatment part The cyclone separator 11 is used to perform preliminary dust removal on the flue gas generated by roasting to remove solid particles in the flue gas.

[0041] There are two treatment routes for the flue gas after being treated by the cyclone separator 11: First route: Part of the flue gas discharged from the cyclone separator 11 enters the afterburner 12, where secondary combustion is carried out to remove incompletely burned harmful substances. In the afterburner 12, SNCR 22 is also used to spray ammonia water into the afterburner 12 to further remove nitrogen oxides. The high-temperature flue gas discharged from the afterburner 12 enters the waste heat boiler 13, which uses the heat of the flue gas to generate steam, which can be used for other industrial purposes.

[0042] After the flue gas comes out of the waste heat boiler 13, it enters the quenching tower 14, where soft water spray is used to quickly cool the temperature of the flue gas to prevent harmful gases from producing secondary reactions under high temperature conditions. The flue gas cooled from the quenching tower 14 enters the bag filter 15 to further remove fine particles in the flue gas to ensure that environmental protection requirements are met. In addition, the soft water in the quenching tower 14 can be discharged into the waste heat boiler 13 after absorbing the heat of the flue gas for heat recovery and reuse.

[0043] The flue gas after dust removal by the bag filter 13 enters the SCR 16. Under the action of the catalyst, nitrogen oxides are further removed by spraying ammonia water to reduce the NOx concentration in the flue gas. The flue gas from the SCR 16 enters the GGH 17, where heat exchange is carried out to recover the heat of the hot flue gas and use it to heat the air supply of subsequent equipment to achieve energy saving. The flue gas after heat exchange by the GGH 17 is passed into the induced draft fan 18, which is used to push the flue gas to the water washing and cooling tower 19. The water washing and cooling tower 19 washes and cools the flue gas to remove harmful components that may remain in the flue gas. The cooled flue gas enters the deacidification tower 20, where the acidic gas in the flue gas is further removed by chemical absorption to ensure that the acidic components of the flue gas meet the standards. The flue gas deacidified by the deacidification tower 20 enters the GGH17 again to further utilize the remaining heat, and is finally discharged into the atmosphere through the chimney 21.

[0044] Second route: Part of the flue gas discharged from the cyclone separator 11 enters the low-temperature economizer 23 and performs heat exchange with deoxygenated water to recover low-temperature waste heat in the flue gas.

[0045] The flue gas discharged from the low-temperature economizer 23 may further enter the waste heat boiler 13 for steam production.

[0046] The flue gas treated by the low-temperature economizer 23 is partially transported back to the multi-stage roasting furnace 7 through the back-mixing fan 24 to supplement the flue gas circulation in the roasting furnace and ensure the heat balance in the roasting furnace.

[0047] Optimization parameters The specific optimization method is given below: Example 2 The blade of the shredder 2 is made of a highly wear-resistant alloy material, such as Cr12MoV high-chromium alloy steel, to improve wear resistance and extend the life of the blade.

[0048] Adjust the speed of shredder 2 to 600-800 rpm to ensure the best crushing effect and reduce the generation of material dust. The speed can also be adjusted appropriately according to the hardness of the filter residue to reduce energy consumption.

[0049] Example 3 Optimization in multi-stage roasting furnace 7: 1. Temperature optimization: Temperature settings for each stage: The first stage (dehydration stage): The temperature is set at 300-350℃ to fully remove the moisture in the filter residue and ensure the subsequent decomposition effect.

[0050] Air-fuel ratio: 8:1-10:1.

[0051] Purpose: This section is mainly used to remove moisture from the filter residue, so a relatively low oxygen concentration is required to maintain mild heating conditions while avoiding excessive oxidation or burning of the material.

[0052] The second stage (metal oxidation stage): The temperature is set at 600-650°C to allow the metal elements to undergo oxidation reaction without volatilizing.

[0053] Air-fuel ratio: 10:1-12:1.

[0054] Purpose: The main purpose of this stage is to make metal elements (such as iron, magnesium, etc.) undergo oxidation reaction. Therefore, a moderate air-fuel ratio is required to ensure that there is enough oxygen to support metal oxidation without wasting fuel.

[0055] The third stage (organic matter combustion stage): the temperature is set at 800-850℃ to ensure complete combustion of organic matter and reduce carbon residue.

[0056] Air-fuel ratio: 12:1-15:1.

[0057] Purpose: In the organic combustion stage, high temperature and sufficient oxygen are required to ensure complete combustion of organic matter and reduce the amount of residual carbon. Therefore, this stage requires a higher air-fuel ratio to ensure sufficient oxygen supply, improve combustion efficiency and reduce harmful emissions.

[0058] 2. Oxygen concentration control: The oxygen concentration in each section of the roasting furnace is controlled by adjusting the air supply volume. The target oxygen content is: The first stage: 5-8%, low oxygen conditions, conducive to mild dehydration.

[0059] The second section: 10-12%, suitable for metal oxidation.

[0060] The third stage: 15-18%, high oxygen content to ensure complete combustion of organic matter.

[0061] It should be noted that the air-fuel ratio is a common term in this field and will not be described in detail.

[0062] Example 4 Soft water in the inclined spiral cooling conveyor 8: Adding corrosion inhibitors to soft water, the corrosion inhibitors are 0.01-0.03% phosphates or molybdates, to reduce the risk of corrosion in the cooling system.

[0063] The soft water flow rate is controlled at 0.8-1.2 m / s to increase turbulence, improve heat exchange efficiency, and quickly reduce the material temperature to 60-80°C, which is suitable for storage and subsequent processing.

[0064] SCR catalyst selection: The use of vanadium-titanium based catalysts can maintain a high denitrification efficiency even at temperatures of 300-400°C.

[0065] 3. Improvement of reagents Example 5 The corrosion inhibitor in Example 4 is improved, and the specific preparation steps of the modified corrosion inhibitor are as follows: Take 1000 ml of deionized water, add 20 g of sodium hydroxide, and stir to completely dissolve it.

[0066] Add 5 grams of molybdenum powder into the solution, heat to 80-90°C, and keep stirring until the molybdenum powder is completely dissolved to form a sodium molybdate solution.

[0067] Add 2 grams of ethanolamine to the sodium molybdate solution and continue stirring to make it evenly dispersed, then add 1 gram of sodium polyacrylate and stir until it is completely dissolved to form a stable organic-inorganic composite corrosion inhibitor solution.

[0068] The concentration of the final solution was adjusted to the appropriate range for corrosion inhibitor use: 0.02-0.05% sodium molybdate content.

[0069] Store the prepared corrosion inhibitor solution in a corrosion-resistant plastic container away from acidic substances and direct sunlight.

[0070] in: Molybdenum powder (Mo): industrial grade, purity 99%, can be purchased from Zhongnuo New Materials.

[0071] Sodium hydroxide (NaOH): industrial grade, purity 95%.

[0072] Ethanolamine: industrial grade, purity 98%.

[0073] Sodium polyacrylate: technical grade, purity 95%. Available from Merck.

[0074] Sodium molybdate forms a molybdenum oxide protective film on the metal surface, ethanolamine forms an organic layer by adsorption on the metal surface, and sodium polyacrylate enhances the adhesion of the film. The homemade composite corrosion inhibitor can form a multi-layer protective film on the metal surface, including an inorganic molybdenum oxide layer, an organic amine adsorption layer, and a sodium polyacrylate reinforcement layer, so that the metal surface of the cooling system has stronger corrosion resistance and mechanical peeling resistance. The composite film formed by the composite corrosion inhibitor is an inorganic-organic layered composite structure at the microscopic level. This structure has excellent corrosion resistance and self-healing ability, and can effectively cope with the high temperature and high humidity environment in the cooling system.

[0075] Example 6 The corrosion inhibitor in Example 5 is improved, which is different from Example 5. In organic-inorganic composite corrosion inhibitor solution Add 3 grams of tea polyphenols into the solution, stir evenly, and maintain the temperature of the solution at 60-70°C to promote the dissolution of tea polyphenols.

[0076] Add 1 gram of flavonoid compound (quercetin) and continue stirring until completely dissolved. Add 1 gram of phosphate derivative (tributyl phosphate) to the solution, maintain the temperature of the solution at 50°C, and while keeping the solution stirring, mix all the ingredients thoroughly.

[0077] Finally, adjust the concentration of the solution to keep the sodium molybdate content within the usage range of 0.02-0.05%.

[0078] The remaining steps are the same as those in Example 5.

[0079] in, Tea polyphenols: food grade, purity 98%.

[0080] Flavonoids (quercetin): analytical grade, purity 95%.

[0081] Tributyl phosphate: industrial grade, purity 98%.

[0082] The purity of the remaining raw materials is the same as that of Example 5.

[0083] First, the dense inorganic film formed by sodium molybdate on the metal surface has the function of blocking oxygen and water molecules. On the basis of the molybdenum oxide layer, tea polyphenols and quercetin form an antioxidant organic film, and the adsorption between their molecules enhances the overall stability and protection ability of the film. Ethanolamine forms an organic protective layer on the metal surface, which enhances the hydrophobicity of the entire composite film and prevents further penetration of corrosive substances. The addition of sodium polyacrylate forms an adhesion layer that interacts with the metal surface, increasing the adhesion strength of the composite film on the metal surface. Tea polyphenols and quercetin work together with sodium molybdate and ethanolamine to form an inorganic-organic micro-layered composite structure. This structure is manifested as alternating inorganic and organic layers at the microscopic level. The layers are closely combined and complement each other, so that the entire membrane structure shows higher stability when subjected to changes in the external environment (such as pH value and temperature changes). Due to the interweaving of sodium molybdate and organic components, many nanoscale pores appear in the microstructure of the membrane. After being filled with tea polyphenols and quercetin molecules, these pores show good anti-permeability and prevent corrosive substances (such as Cl - ) entry.

[0084] Unless otherwise specified, the parts, equipment, materials, reagents, etc. used in the aforementioned embodiments can be obtained from commercial channels. The principles or mechanisms of the parts or equipment that can be purchased through conventional commercial channels are well known and have been given common names, so they are not elaborated on.

[0085] In summary, although the present invention has been disclosed as above in terms of preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A method for improving the roasting efficiency of gasification filter residue, characterized in that: It includes oil residue gasification filter residue, which falls into the shredder after being unpacked from the ton bag. The shredder performs preliminary crushing on the oil residue gasification filter residue, and the crushed filter residue enters the Z-type bucket elevator, which lifts the crushed filter residue and sends it to the raw material silo for temporary storage. The temporarily stored filter residue is lifted to a height suitable for entering the multi-stage roasting furnace by the Z-type feed bucket elevator, and the lifted filter residue is distributed to the multi-stage roasting furnace through the feed flap for roasting. The roasted filter residue is discharged from the multi-stage roasting furnace and enters the inclined spiral cooling conveyor for cooling. The cooled filter residue is transported to the finished product silo; the smoke generated during the roasting process enters the cyclone separator for treatment.

2. The method for improving the roasting efficiency of gasification filter residue according to claim 1, characterized in that: The following steps are also included: a cyclone separator performs preliminary dust removal on the flue gas generated by roasting; a portion of the flue gas discharged by the cyclone separator enters the afterburner chamber for secondary combustion; in the afterburner chamber, an SNCR system is also used to spray ammonia water into the afterburner chamber to remove nitrogen oxides; the flue gas discharged from the afterburner chamber enters the waste heat boiler, which uses the heat of the flue gas to generate steam.

3. The method for improving the roasting efficiency of gasification filter residue according to claim 2, characterized in that: The process also includes the following steps: the remaining flue gas enters a quenching tower after coming out of the waste heat boiler, and the temperature of the flue gas is cooled by spraying soft water; the flue gas cooled in the quenching tower enters a bag filter to remove fine particles in the flue gas.

4. The method for improving the roasting efficiency of gasification filter residue according to claim 3, characterized in that: The process also includes the following steps: the flue gas after dust removal by the bag filter enters the SCR to remove nitrogen oxides, the flue gas from the SCR enters the GGH to recover the heat of the flue gas, the flue gas after heat exchange by the GGH is pushed to the water washing and cooling tower by the induced draft fan, the water washing and cooling tower washes and cools the flue gas to remove harmful components remaining in the flue gas, the cooled flue gas enters the deacidification tower for deacidification, the deacidified flue gas enters the GGH again to recover the remaining heat, and is finally discharged through the chimney.

5. The method for improving the roasting efficiency of gasification filter residue according to claim 2, characterized in that: It also includes the following steps: another part of the flue gas discharged from the cyclone separator enters the low-temperature economizer, exchanges heat with the deoxygenated water, and recovers the low-temperature waste heat in the flue gas; part of the flue gas discharged from the low-temperature economizer enters the waste heat boiler, and part is sent back to the multi-stage roasting furnace through the back-mixing fan to supplement the flue gas circulation in the multi-stage roasting furnace and maintain heat balance.

6. The method for improving the roasting efficiency of gasification filter residue according to claim 2, characterized in that: Gas and air are also introduced into the afterburner, and gas and external air are also introduced into the multi-stage roasting furnace.

7. The method for improving the roasting efficiency of gasification filter residue according to claim 1, characterized in that: Soft water is also introduced into the inclined spiral cooling conveyor, and corrosion inhibitors are added to the soft water. The corrosion inhibitors include phosphates, molybdates, and modified corrosion inhibitors.

8. The method for improving the roasting efficiency of gasification filter residue according to claim 7, characterized in that: The preparation method of the modified corrosion inhibitor comprises the following steps: Molybdenum powder is added to a sodium hydroxide solution, heated, and stirred to obtain a sodium molybdate solution. Ethanolamine is added to the sodium molybdate solution, and stirring is continued. Then, sodium polyacrylate is added and stirred until it is completely dissolved to obtain a modified corrosion inhibitor.

9. The method for improving the roasting efficiency of gasification filter residue according to claim 7, characterized in that: The preparation method of the modified corrosion inhibitor comprises the following steps: Molybdenum powder is added to a sodium hydroxide solution, heated, and stirred to obtain a sodium molybdate solution, ethanolamine is added to the sodium molybdate solution, stirring is continued, and then sodium polyacrylate is added and stirred until completely dissolved to obtain a mixed solution, and then tea polyphenols are added to the mixed solution, stirred and heated, and then flavonoid compounds are added and stirred until completely dissolved, and then a phosphate derivative is added and mixed evenly to obtain a modified corrosion inhibitor.

10. The method for improving the efficiency of roasting gasification residue according to any one of claims 1 to 9 is applied to a roasting device for roasting gasification residue, characterized in that: The gasification filter residue roasting device comprises a shredder, the shredder is connected to a raw material silo via a Z-shaped bucket elevator, the raw material silo is connected to a feed flap via a Z-shaped feed bucket elevator, the feed flap is connected to a multi-stage roasting furnace, and the multi-stage roasting furnace is connected to a finished product silo via an inclined spiral cooling conveyor; The multi-stage roasting furnace is also connected to the afterburner through a cyclone separator, the afterburner is connected to the quench tower through a waste heat boiler, the quench tower is connected to the SCR through a bag filter, the SCR is connected to the induced draft fan through GGH, the induced draft fan is connected to the deacidification tower through a water washing and cooling tower, and the deacidification tower is connected to the chimney through GGH; In addition, the afterburner is also connected to the SNCR; the cyclone separator is also connected to the return mixing fan through the low-temperature economizer, the return mixing fan is connected to the multi-stage roasting furnace, and the low-temperature economizer is also connected to the waste heat boiler.

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