WO2020007062A1 - 一种流化床两段气化与闪速轻烧菱镁矿一体化工艺 - Google Patents

一种流化床两段气化与闪速轻烧菱镁矿一体化工艺 Download PDF

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Publication number
WO2020007062A1
WO2020007062A1 PCT/CN2019/077423 CN2019077423W WO2020007062A1 WO 2020007062 A1 WO2020007062 A1 WO 2020007062A1 CN 2019077423 W CN2019077423 W CN 2019077423W WO 2020007062 A1 WO2020007062 A1 WO 2020007062A1
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Prior art keywords
gas
magnesite
air
fluidized bed
gasification
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PCT/CN2019/077423
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English (en)
French (fr)
Chinese (zh)
Inventor
许光文
韩振南
程继光
何伟
刘雪景
安萍
王永生
于泮杰
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沈阳化工大学
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Priority to RU2021102498A priority Critical patent/RU2770315C1/ru
Priority to ATA9240/2019A priority patent/AT523311B1/de
Publication of WO2020007062A1 publication Critical patent/WO2020007062A1/zh
Priority to AU2021100709A priority patent/AU2021100709A4/en

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/02—Roasting processes
    • C22B1/10—Roasting processes in fluidised form
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/10—Preheating, burning calcining or cooling
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/10—Preheating, burning calcining or cooling
    • C04B2/102—Preheating, burning calcining or cooling of magnesia, e.g. dead burning
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/10—Preheating, burning calcining or cooling
    • C04B2/106—Preheating, burning calcining or cooling in fluidised bed furnaces
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00—Lime, magnesia or dolomite
    • C04B2/10—Preheating, burning calcining or cooling
    • C04B2/108—Treatment or selection of the fuel therefor
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
    • C22B26/20—Obtaining alkaline earth metals or magnesium
    • C22B26/22—Obtaining magnesium

Definitions

  • the invention relates to a magnesite smelting process, in particular to an integrated process of two-stage gasification of a fluidized bed and flash light burning magnesite.
  • China is one of the countries with the most abundant magnesite resources in the world, with a total reserve of about 3 billion tons of ore, accounting for 25% of the world's total reserves.
  • Liaoning magnesite reserves are the most abundant, accounting for 85.6% of the country's total reserves, mainly concentrated in Dashiqiao and Haicheng, with an annual mining volume of about 12-15 million tons.
  • Magnesite is the main raw material for making magnesium compounds. Light-burned magnesium is obtained from calcination of magnesite. It is widely used in many fields such as building materials, chemical industry, metallurgy, medicine, etc. It is an ideal material for magnesium sulfate, papermaking, desulfurization process, slag splashing in steel plant protection furnace, etc. It is also the raw material for making reburned magnesium, high purity magnesia and fused magnesium.
  • Liaoning currently has 2,771 calcining furnaces and kilns for the production of refractory raw materials, of which 1,367 are light-fired kiln, and the output of light-burned magnesia exceeds 4 million tons per year.
  • the device for making light-burned magnesia by calcining magnesite has been using the traditional process of "water gas generator” combined with “reflection furnace” or "shaft kiln” to calcinate magnesite, among which shaft kiln calcined magnesite Ores are generally used to produce light-burned magnesia, but this method generally uses large magnesite kiln to be calcined.
  • the size of the material into the furnace needs to be not less than 40 mm, so that a large number of small-sized materials and fines cannot be used.
  • ore with a particle size of less than 25 millimeters accounts for 40 to 45% during mining. This part of the ore is often abandoned or used for paving the road, which causes huge waste of resources while occupying land and polluting the environment, causing serious environmental protection problems.
  • the heat consumption is as high as 7.40 to 8.54 GJ / t-MgO, and the quality of lightly burning MgO powder is unstable, and the dust concentration in the exhaust gas is higher than 500 mg / Nm 3 , Up to 1000mg / Nm 3 or more, labor productivity is only 1100t / person ⁇ year, low degree of automation, is a very backward light burning system and method.
  • the heat source generating equipment used in the light-burning magnesium kiln is mainly a water gas generator.
  • the gas produced has a high tar content. In order to obtain clean gas, it must be sprayed with water to condense the tar. In this process, unavoidable Wastewater such as phenol water has caused environmental pollution.
  • patent application number CN106587666A discloses a device and method for producing light-burned magnesium oxide from magnesite flotation concentrate powder.
  • the device includes a feeder, a flash dryer, a raw material dry product trap, a multi-stage preheating system, a bag filter, a dynamic calciner, a gas combustion furnace, a finished product trap, an induced draft fan, and a piping system.
  • the method steps are as follows: (1) magnesite flotation concentrate powder is sent from a feeder to a flash dryer for drying treatment; (2) the dried material is collected by a raw material dry product trap and sent to a multi-stage The preheating system achieves preheating; (3) The preheated material is collected by a multi-stage preheating system and sent to a dynamic calciner to achieve calcination and decomposition treatment to produce light-burned magnesium oxide. The process of drying, preheating and calcining the materials is carried out by dilute phase carrier current.
  • This invention effectively utilizes low-grade magnesite flotation dehydrated concentrate to produce light-burned magnesium oxide, and has achieved light-burning on an industrial scale. However, this invention does not effectively utilize the waste heat of light-burned magnesium products, causing a large amount of heat loss In addition, industrial-scale light burning still uses a water gas generator, which does not solve the problems of phenol water wastewater and the like.
  • the traditional technology of calcined magnesite currently used is backward, energy consumption is high, only large particles of raw materials are used, the calcination reaction speed is slow, product quality is difficult to control, and the intermittent operation mode is used, high labor costs, high work intensity, dust The pollution is large and the working environment is poor, so a comprehensive upgrade of magnesite light burning technology is urgently needed.
  • the object of the present invention is to provide an integrated process of two-stage gasification and flash light burning magnesite in a fluidized bed.
  • the process uses a fully enclosed conveying bed for continuous calcination instead of the "reflection furnace" intermittent operation to solve the large dust pollution during the light burning process.
  • the two-stage gasification unit has a simple structure, a large processing capacity, and low manufacturing and maintenance costs. It solves the problems of tar, phenol water and other pollutants produced in traditional processes, low carbon conversion rate, and waste of energy.
  • the present invention provides a process for integrating two-stage gasification of a fluidized bed with flash light burning magnesite.
  • the present invention directly integrates the process of producing two-stage gasification of a (fuel) fluidized bed for gas production and the use of the gas Flash light burning process of magnesium ore powder conveying bed, direct combustion of high temperature gas without low temperature cooling provides heat for flash light burning of magnesite powder conveying bed.
  • the fuel is first added to the pyrolyzer from the feeding device, and the fuel is dried / pyrolyzed or partially gasified under the heating of the hot bed material circulating into the pyrolyzer or the oxidation of the air supplied to the pyrolyzer.
  • the generated pyrolysis products enter the downstream gasification furnace through the pipeline, and at the same time, a gasifier is passed into the bottom of the gasification furnace, so that the semi-coke is gasified in the gasification furnace.
  • Gasification, catalytic reforming of semi-tar tar to remove tar, unreacted semi-coke is returned to the pyrolyzer after gas-solid separation.
  • the generated gas is heat-exchanged with water and air through an air preheater and a waste heat boiler, and the water vapor and air generated after the heat exchange are passed into the bottom of the gasification furnace together as a gasification agent.
  • the heat-exchanged gas is filtered and dedusted to produce clean gas, which is passed into the burner, and the hot flue gas generated by the combustion is quickly calcined magnesite powder through gas-solid interaction in a conveying bed reactor of the magnesite powder calcining furnace.
  • the gas velocity is 3-20m / s, and the particle size of the magnesite raw material used is less than 200 ⁇ m.
  • the product is separated by gas and solid.
  • the obtained high-temperature flue gas is preheated by the flue gas heat exchange system, and the preheated mineral powder is sent to the calciner.
  • the heat exchanged flue gas is filtered and dusted. Discharge;
  • the high-temperature light-burned magnesium produced by gas-solid separation is used to preheat the air required for the clean gas burner through the product heat exchange system.
  • the cooled light-burned magnesium product is delivered to the storage tank.
  • the two-stage gasification process of the fluidized bed mainly includes: a feeding device, a pyrolyzer, a gasification furnace, a gas-solid separation device, an air preheater, a waste heat boiler, and filtering and dust removal, etc.
  • the fuel is first sent to the pyrolyzer for heat treatment. Pyrolysis or oxidative pyrolysis, all the pyrolysis products and semi-coke produced are sent to the gasification furnace, and the temperature of the gas after the waste heat boiler is higher than the temperature of the condensed and discharged wastewater, such as 100 ° C.
  • the high-temperature gas and air indirectly exchange heat for preheating the air, and then generate steam through the gas waste heat boiler.
  • the preheated air and the generated steam are sent to the gasifier and the pyrolyzer.
  • the reactor of the gasification furnace is a rapid fluidized bed or a conveying bed
  • the pyrolyzer is one or any combination of a bubbling / turbulent fluidized bed, a rapid fluidized bed, a conveying bed, a descending bed, and a moving fluidized bed. .
  • the process of flash light burning magnesite mainly includes: gas burner, magnesite powder calciner, gas-solid separation device, flue gas preheating material system, light burning powder product preheating air system, filtering and dust removing device, etc.
  • Magnesite The ore powder calcining furnace uses a transport bed reactor, the gas burner uses preheated air, and the raw materials entering the magnesite calcining furnace are preheated magnesite powder. After the gas-solid separation, the high-temperature light-burned powder product and the gas required for combustion are directly contacted to exchange heat to preheat the air and cool the light-magnesium product. Cool the flue gas to preheat magnesite powder.
  • the two-stage gasification device of the present invention has a simple structure, a large processing capacity, and low manufacturing and maintenance costs.
  • the thermal efficiency of the invention is improved, and the tar content in the generated gas is low, which solves the problems of tar, phenol water and other pollutants output, low carbon conversion rate, and waste of energy in the traditional process.
  • the clean gas combustion flame produced by the present invention can be fully contacted with magnesite, the reaction speed is fast, and the product properties are uniform.
  • the magnesite raw material used in the present invention has a small particle size, which solves the problem that the reflective kiln can only use large particle raw materials and avoids waste of resources.
  • the continuous calcination of the fully enclosed conveying bed of the present invention replaces the intermittent operation of the "reflection furnace", and solves the problems of large dust pollution and harsh working environment during the light burning process.
  • the invention has high heat recovery efficiency, makes full use of the flue gas and the waste heat of the product, avoids a large amount of waste of heat, and greatly reduces the energy consumption of light burning magnesium production.
  • the invention directly integrates gas production and magnesite light burning, which has the advantages of high integration, high thermal efficiency, continuous and stable process, and no coal gasification waste water, and flash light burning magnesite powder, high product activity, uniform quality, and promotion
  • the application prospect is broad.
  • FIG. 1 is a schematic diagram of Embodiment 1 of a process flow of the present invention.
  • the integrated process of two-stage gasification of a fluidized bed and flash light burning magnesite is characterized by directly integrating (fuel) two-stage gasification of a fluidized bed to produce gas and a magnesite powder conveying bed using the gas.
  • high-temperature gas is directly burned without low-temperature cooling to provide heat for the flash light burning of magnesite powder conveying bed.
  • the integrated process of two-stage gasification of a fluidized bed and flash light burning magnesite is characterized in that the two-stage gasification process of the fluidized bed mainly includes: a feeding device, a pyrolyzer, a gasifier, and a gasifier. Solid separation device, air preheater, waste heat boiler, filtering and dust removal, etc.
  • the fuel is sent to the pyrolyzer for pyrolysis or oxidative pyrolysis. All pyrolysis products and semi-coke produced are sent to the gasifier, waste heat boiler
  • the temperature of the subsequent gas is higher than the temperature of the condensed and precipitated wastewater, such as 100 ° C.
  • the process of integrating the two-stage gasification of a fluidized bed with flash lightly burned magnesite is characterized in that the flash lightly burned magnesite process mainly includes: a gas burner, magnesite powder calciner, gas-solid Separation device, flue gas preheating material system, light burning powder product preheating air system, filtering and dust removing device, etc.
  • a gas burner magnesite powder calciner
  • gas-solid Separation device flue gas preheating material system
  • light burning powder product preheating air system mainly includes: a gas burner, magnesite powder calciner, gas-solid Separation device, flue gas preheating material system, light burning powder product preheating air system, filtering and dust removing device, etc.
  • Magnesite powder calcining furnace uses conveying bed reactor, gas burner uses preheated air to enter magnesite mine
  • the raw material of the calcining furnace is pre-heated magnesite powder.
  • the two-stage gasification process of a fluidized bed is characterized in that high-temperature gas and air after gas-solid separation indirectly exchange heat to preheat air, and then generate steam through a gas-fired waste heat boiler. The preheated air and the generated steam are sent to the gas.
  • the process of flash lightly burning magnesite is characterized in that the gas velocity in the transport bed reactor of the magnesite powder calcining furnace is 3-20 m / s, and the particle size of the magnesite raw material used is less than 200 ⁇ m.
  • the process of flash-light burning magnesite is characterized in that the high-temperature light-burning powder product after gas-solid separation and the air required for combustion of the gas pass through direct contact with heat exchange to preheat the air and cool the light-magnesium product.
  • the high temperature flue gas directly contacts the raw magnesite powder to exchange heat to cool the flue gas to preheat the magnesite powder.
  • the fuel is added to the pyrolyzer, and the fuel is dried / pyrolyzed or partially gasified under the heating of the hot bed material circulating into the pyrolyzer or the oxidation of the air supplied to the pyrolyzer;
  • the generated pyrolysis product is sent into the gasification furnace, and at the same time, a gasifier is passed to the bottom of the gasification furnace, so that the semi-coke is gasified in the gasification furnace, and the high-temperature cracking in the gasification furnace, partial gasification, Catalytic reforming of semi-tar tar removes tar;
  • the generated gas is heat-exchanged with water and air through the air preheater and waste heat boiler, and the steam and air after the heat exchange are passed into the bottom of the gasifier as a gasifier.

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  • Physics & Mathematics (AREA)
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  • Treating Waste Gases (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
PCT/CN2019/077423 2018-07-05 2019-03-08 一种流化床两段气化与闪速轻烧菱镁矿一体化工艺 WO2020007062A1 (zh)

Priority Applications (3)

Application Number Priority Date Filing Date Title
RU2021102498A RU2770315C1 (ru) 2018-07-05 2019-03-08 Объединённый способ двухстадийной газификации в псевдоожиженном слое и слабого флеш-обжига магнезита
ATA9240/2019A AT523311B1 (de) 2018-07-05 2019-03-08 Integriertes Verfahren einer zweistufigen Wirbelschichtvergasung und eines Flash-Schwachbrennens von Magnesit
AU2021100709A AU2021100709A4 (en) 2018-07-05 2021-02-04 Integrated process of fluidized bed two-stage gasification and flash light-burning of magnesite

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CN201810731247.9 2018-07-05
CN201810731247.9A CN109136539B (zh) 2018-07-05 2018-07-05 一种流化床两段气化与闪速轻烧菱镁矿一体化工艺

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Cited By (3)

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CN111747663A (zh) * 2020-08-20 2020-10-09 沈阳工业大学 一种悬浮煅烧制备轻烧氧化镁的装置及工艺方法
CN111777340A (zh) * 2020-08-20 2020-10-16 辽宁圣世资源环境科技有限公司 烟气自循环热解制备轻烧氧化镁并富集二氧化碳的装置
CN111825350A (zh) * 2020-08-20 2020-10-27 辽宁圣世资源环境科技有限公司 一种兼具轻烧氧化镁制备和二氧化碳收集的装置

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CN109136539B (zh) * 2018-07-05 2020-06-23 沈阳化工大学 一种流化床两段气化与闪速轻烧菱镁矿一体化工艺
CN112304092B (zh) * 2020-10-14 2022-10-04 沈阳化工大学 一种粉粒物料流化床烧结装置
CN112779057A (zh) * 2020-12-31 2021-05-11 上海电气集团股份有限公司 一种油泥综合处理系统及油泥综合处理方法
CN117303757B (zh) * 2023-12-01 2024-02-20 岫岩满族自治县恒锐镁制品有限公司 一种菱镁矿轻烧工艺及系统

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Publication number Priority date Publication date Assignee Title
CN111747663A (zh) * 2020-08-20 2020-10-09 沈阳工业大学 一种悬浮煅烧制备轻烧氧化镁的装置及工艺方法
CN111777340A (zh) * 2020-08-20 2020-10-16 辽宁圣世资源环境科技有限公司 烟气自循环热解制备轻烧氧化镁并富集二氧化碳的装置
CN111825350A (zh) * 2020-08-20 2020-10-27 辽宁圣世资源环境科技有限公司 一种兼具轻烧氧化镁制备和二氧化碳收集的装置
CN111747663B (zh) * 2020-08-20 2023-09-15 沈阳工业大学 一种悬浮煅烧制备轻烧氧化镁的装置及工艺方法
CN111777340B (zh) * 2020-08-20 2024-04-23 辽宁东大粉体工程技术有限公司 烟气自循环热解制备轻烧氧化镁并富集二氧化碳的装置
CN111825350B (zh) * 2020-08-20 2024-04-26 辽宁东大粉体工程技术有限公司 一种兼具轻烧氧化镁制备和二氧化碳收集的装置

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CN109136539B (zh) 2020-06-23
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