CN103014202B - Device and method for recovering high-temperature sensible heat of liquid blast furnace slag - Google Patents
Device and method for recovering high-temperature sensible heat of liquid blast furnace slag Download PDFInfo
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- CN103014202B CN103014202B CN201210561078.1A CN201210561078A CN103014202B CN 103014202 B CN103014202 B CN 103014202B CN 201210561078 A CN201210561078 A CN 201210561078A CN 103014202 B CN103014202 B CN 103014202B
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- 239000002893 slag Substances 0.000 title claims abstract description 201
- 239000007788 liquid Substances 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 50
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 129
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 238000011084 recovery Methods 0.000 claims abstract description 22
- 239000004568 cement Substances 0.000 claims abstract description 9
- 238000006057 reforming reaction Methods 0.000 claims abstract description 7
- 238000005469 granulation Methods 0.000 claims description 42
- 230000003179 granulation Effects 0.000 claims description 42
- 239000002245 particle Substances 0.000 claims description 20
- 238000010791 quenching Methods 0.000 claims description 16
- 230000000171 quenching effect Effects 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 14
- 238000012546 transfer Methods 0.000 claims description 8
- 239000003054 catalyst Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 210000002435 tendon Anatomy 0.000 claims description 6
- 238000002407 reforming Methods 0.000 claims description 5
- 238000010583 slow cooling Methods 0.000 claims description 4
- 238000006555 catalytic reaction Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000009957 hemming Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 18
- 239000002918 waste heat Substances 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 229910000831 Steel Inorganic materials 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 11
- 239000010959 steel Substances 0.000 abstract description 11
- 229910052742 iron Inorganic materials 0.000 abstract description 9
- 238000011161 development Methods 0.000 abstract description 6
- 238000007908 dry granulation Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 19
- 239000001257 hydrogen Substances 0.000 description 13
- 229910052739 hydrogen Inorganic materials 0.000 description 13
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- 239000010410 layer Substances 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- 238000000629 steam reforming Methods 0.000 description 5
- 239000006227 byproduct Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
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- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
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- 231100000719 pollutant Toxicity 0.000 description 2
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- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 208000032544 Cicatrix Diseases 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
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- 239000000571 coke Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 238000011010 flushing procedure Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
- C21B2400/066—Receptacle features where the slag is treated
- C21B2400/074—Tower structures for cooling, being confined but not sealed
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Furnace Details (AREA)
- Manufacture Of Iron (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
本发明涉及钢铁工业余热余能回收技术领域,特别涉及一种回收液态高炉渣高温显热的装置及方法;利用液态高炉渣的高温显热进行CH4-H2O-CO2重整反应生产甲醇,冷却后的高炉渣用于生产水泥。本发明通过干式粒化、显热回收和能量转换三个过程,高效、经济、环保、节能地利用了液态高炉渣的高温余热资源,而且处理后的高炉渣可满足制造水泥的要求,生产的甲醇属于应用广泛的高附加值产品,符合未来“甲醇经济”发展需要。
The invention relates to the technical field of recovery of waste heat and energy in the iron and steel industry, in particular to a device and method for recovering high-temperature sensible heat of liquid blast furnace slag; using the high-temperature sensible heat of liquid blast furnace slag to carry out CH 4 -H 2 O-CO 2 reforming reaction production Methanol, cooled blast furnace slag is used to produce cement. Through three processes of dry granulation, sensible heat recovery and energy conversion, the present invention utilizes the high-temperature waste heat resource of liquid blast furnace slag in an efficient, economical, environmentally friendly and energy-saving manner, and the processed blast furnace slag can meet the requirements for manufacturing cement, and the production Methanol is a widely used high value-added product, which meets the development needs of the "methanol economy" in the future.
Description
技术领域 technical field
本发明属于钢铁工业余热余能回收技术领域,特别涉及一种回收液态高炉渣高温显热的装置及其方法。 The invention belongs to the technical field of waste heat and energy recovery in the iron and steel industry, and in particular relates to a device and method for recovering high-temperature sensible heat of liquid blast furnace slag.
背景技术 Background technique
钢铁工业为国民经济的发展提供重要的基础原材料,属于能源、资源消耗大的资源密集型产业。随着钢铁产量的高速增长,资源、能源和污染物排放已成为制约我国钢铁工业进一步发展的限制性因素。虽然钢铁工业是国民经济领域内的耗能和排污大户,但同时也是极具节能减排潜力的产业之一。其中,回收利用各种余热是钢铁工业进一步节能的重要突破口。高炉渣是高炉炼铁产生的固体废弃物,但同时液态高炉渣温度在1500℃左右,有取材易,显热高等特点,是非常优质的余热资源。2011年中国生铁产量约为6.3亿吨,产生高炉渣约1.9亿吨,按照平均比热1.05kJ/(kg·℃)计算,高炉渣从1500℃冷却到环境温度,带走的显热约2.94×108GJ,折合标准煤约1000万吨。可见,回收高炉渣的显热对钢铁工业节能减排,提高能源利用效率至关重要。 The iron and steel industry provides important basic raw materials for the development of the national economy, and is a resource-intensive industry that consumes a lot of energy and resources. With the rapid growth of steel production, resources, energy and pollutant emissions have become restrictive factors restricting the further development of my country's steel industry. Although the iron and steel industry is a major energy consumer and pollutant discharger in the national economy, it is also one of the industries with great potential for energy conservation and emission reduction. Among them, recycling all kinds of waste heat is an important breakthrough for further energy saving in the iron and steel industry. Blast furnace slag is a solid waste produced by blast furnace ironmaking, but at the same time, the liquid blast furnace slag has a temperature of about 1500°C, which is easy to obtain and has high sensible heat. It is a very high-quality waste heat resource. In 2011, China's pig iron output was about 630 million tons, and blast furnace slag was about 190 million tons. Calculated according to the average specific heat of 1.05kJ/(kg·℃), the blast furnace slag was cooled from 1500℃ to ambient temperature, and the sensible heat taken away was about 2.94 ×10 8 GJ, equivalent to about 10 million tons of standard coal. It can be seen that recovering the sensible heat of blast furnace slag is very important for the iron and steel industry to save energy and reduce emissions, and to improve energy utilization efficiency.
目前,我国高炉渣处理全部采用水淬法,包括拉萨法(RASA)、INBA法、轮法、明特法、沉淀池等多种方法,这些方法的共同特点是采用了不同的工艺装置把热渣水淬粒化,用不同的装置使渣水分离后将渣输出,即主要靠水带走渣热,其热能利用率极低。同时,水耗很高,冲制1吨水渣消耗新水0.8~1.2吨,循环水量约为10吨左右。所谓的热能利用就是将在高炉渣水淬冷却过程中产生的热水用于冬季取暖,由于受到供热区域、流量等条件的限制,现渣热能利用率不足15%。而且春、夏、秋三个季节不能使用,大量热通过风冷或外排水排掉,即污染环境又浪费能源。另外,水淬渣过程中产生的H2S和SO2随蒸汽排入大气,污染环境。 At present, all blast furnace slag treatment in my country adopts water quenching method, including Lhasa method (RASA), INBA method, wheel method, Minter method, sedimentation tank and other methods. The common feature of these methods is that different process devices are used to transfer heat The slag water quenching granulation uses different devices to separate the slag water and then outputs the slag, that is, the heat of the slag is mainly taken away by water, and its heat energy utilization rate is extremely low. At the same time, the water consumption is very high, 0.8~1.2 tons of fresh water is consumed for flushing 1 ton of slag, and the circulating water volume is about 10 tons. The so-called thermal energy utilization is to use the hot water generated during the water quenching process of blast furnace slag for heating in winter. Due to the limitation of heating area, flow rate and other conditions, the thermal energy utilization rate of existing slag is less than 15%. Moreover, it cannot be used in spring, summer, and autumn, and a large amount of heat is discharged through air cooling or external drainage, which pollutes the environment and wastes energy. In addition, the H 2 S and SO 2 produced in the process of water quenching slag are discharged into the atmosphere along with the steam, polluting the environment.
目前,国内外高炉渣余热回收方法主要有物理法和化学法。物理法是利用换热介质(多用压缩空气)或换热盘管直接与高炉渣进行热交换,产生热空气或水蒸气。主要包括干法处理的风淬法、滚筒转鼓法和离心粒化法。这些方法目前均未得到推广应用,主要是因为:(1)高炉渣排出时温度高,其蕴含热量巨大,而空气的比热较低,以空气为换热介质回收高炉渣显热势必会造成风渣比较大,动力消耗大;(2)干法粒化余热回收得到的冶金渣颗粒较小,颗粒在固定床、流化床中孔隙率较低,导致鼓风阻力增加,从而增加了余热回收系统的动力消耗;(3)高温空气带动余热锅炉生产蒸汽导致能量的二次损失,同时还存在电力消耗。化学法是将高炉渣的热量作为化学反应的热源回收利用。主要有制氢、制煤气、利用熔渣直接生产产品等。上述利用化学反应回收高炉渣显热的方案基本都处于理论探索和实验室研究阶段,离实际应用还有一定距离。 At present, there are mainly physical and chemical methods for recovering waste heat from blast furnace slag at home and abroad. The physical method is to use the heat exchange medium (usually compressed air) or the heat exchange coil to directly exchange heat with the blast furnace slag to generate hot air or water vapor. It mainly includes wind quenching method, drum drum method and centrifugal granulation method of dry treatment. These methods have not been popularized and applied at present, mainly because: (1) The temperature of blast furnace slag is high when it is discharged, and it contains a huge amount of heat, while the specific heat of air is low. Using air as the heat exchange medium to recover the sensible heat of blast furnace slag will inevitably cause The air slag is relatively large, and the power consumption is large; (2) The metallurgical slag particles obtained by dry granulation waste heat recovery are small, and the porosity of the particles in the fixed bed and fluidized bed is low, resulting in an increase in the blast resistance, thereby increasing the waste heat. Power consumption of the recovery system; (3) High temperature air drives the waste heat boiler to produce steam, resulting in secondary loss of energy and power consumption. The chemical method is to recycle the heat of blast furnace slag as the heat source of chemical reaction. Mainly include hydrogen production, coal gas production, direct production of products using slag, etc. The above schemes of utilizing chemical reactions to recover sensible heat from blast furnace slag are basically in the stage of theoretical exploration and laboratory research, and there is still a certain distance from practical application.
发明内容 Contents of the invention
发明目的 purpose of invention
针对液态高炉渣水淬法存在水耗大、热量不能有效回收利用和干式回收风渣比大、动力消耗较高、热能品质降低等问题,本发明提供了一种回收液态高炉渣高温显热的装置及方法,目的是高效、经济、环保、节能地利用液态高炉渣的高温余热资源,而且处理后的高炉渣可满足制造水泥的要求。 Aiming at the problems that the water quenching method of liquid blast furnace slag has large water consumption, the heat cannot be effectively recycled and utilized, the ratio of dry-type recovery of blast furnace slag is large, the power consumption is high, and the quality of heat energy is reduced. The purpose of the device and method is to efficiently, economically, environmentally friendly, and energy-saving utilize the high-temperature waste heat resource of liquid blast furnace slag, and the processed blast furnace slag can meet the requirements of cement production.
技术方案 Technical solutions
一种回收液态高炉渣高温显热的装置,其特征在于:包括粒化反应器,在粒化反应器的顶部设置有渣流管和气体出口,渣流管上方为中间包,粒化反应器内部设有转杯和驱动转杯的变频调速电机,在粒化反应器的四周器壁上设有6~8个喷嘴,喷嘴与环管相连;粒化反应器的底部与粒化渣填充床顶部相连;粒化渣填充床的内部设有旋转布风器,旋转布风器与电机相连,气体进口与旋转布风器相连,旋转布风器下方还设有旋转卸料阀。 A device for recovering high-temperature sensible heat of liquid blast furnace slag, characterized in that it includes a granulation reactor, a slag flow pipe and a gas outlet are arranged on the top of the granulation reactor, a tundish is located above the slag flow pipe, and the granulation reactor There is a rotor inside and a variable frequency motor for driving the rotor. There are 6 to 8 nozzles on the wall around the granulation reactor, and the nozzles are connected to the ring pipe; the bottom of the granulation reactor is filled with granulated slag. The top of the bed is connected; the inside of the granulated slag-packed bed is equipped with a rotary air distributor, which is connected to the motor, the gas inlet is connected to the rotary air distributor, and a rotary discharge valve is installed under the rotary air distributor.
所述的各喷嘴的轴线相切于一虚拟圆,此虚拟圆与转杯的上表面在同一平面上,从喷嘴喷入的气体沿粒化反应器的切向进入,且其旋流方向与转杯旋转方向相反。 The axes of each nozzle are tangent to a virtual circle, which is on the same plane as the upper surface of the rotor cup, the gas injected from the nozzle enters along the tangential direction of the granulation reactor, and its swirl direction is the same as The rotors rotate in opposite directions.
所述的旋转布风器包括底座、风帽和破渣筋,底座上方设有风帽,风帽上设有破渣筋。 The rotary air distributor includes a base, a wind cap and a slag breaking rib, the base is provided with a hood, and the hood is provided with a slag breaking rib.
所述风帽设置为3~5层,每层风帽板内径、外径处均采用折边结构。 The hoods are arranged in 3 to 5 layers, and the inner and outer diameters of the hood boards of each layer adopt a hemming structure.
所述风帽上设置6条破渣筋,破渣筋头向上翘起,呈耙齿形,沿旋转布风器转动方向,破渣筋的前方边缘高于后方边缘。 6 slag-breaking ribs are arranged on the hood, and the heads of the slag-breaking ribs are tilted upwards in the shape of rake teeth. Along the rotation direction of the rotary air distributor, the front edge of the slag-breaking rib is higher than the rear edge.
一种用如上所述的回收液态高炉渣高温显热的装置进行高温显热回收的方法,其特征在于:利用液态高炉渣的高温显热进行CH4-H2O-CO2重整反应生产甲醇,高炉渣既是传热介质,又是催化剂,冷却后的高炉渣用于生产水泥。 A method for recovering high-temperature sensible heat using the above-mentioned device for recovering high-temperature sensible heat of liquid blast furnace slag, characterized in that: using the high-temperature sensible heat of liquid blast furnace slag to carry out CH 4 -H 2 O-CO 2 reforming reaction to produce Methanol and blast furnace slag are both heat transfer medium and catalyst, and the cooled blast furnace slag is used to produce cement.
CH4-H2O-CO2混合气体中CH4:H2O:CO2的摩尔比为3:2:1,混合气体分两部分,占总量10~20%的混合气体用于液态高炉渣的粒化和急冷,占总量80~90%的混合气体用于粒化后高炉渣的冷却,最终全部混合气体发生重整化学反应生成甲醇。 The molar ratio of CH 4 : H 2 O : CO 2 in the CH 4 -H 2 O-CO 2 mixed gas is 3:2:1. The mixed gas is divided into two parts, and the mixed gas accounting for 10~20% of the total is used for liquid For the granulation and quenching of blast furnace slag, the mixed gas accounting for 80-90% of the total is used for cooling the granulated blast furnace slag, and finally all the mixed gas undergoes a reforming chemical reaction to produce methanol.
在粒化反应器内,液态高炉渣在转杯离心力和高速喷出的反应性混合气体(CH4-H2O-CO2)的风力作用下冷却粒化,高温渣粒与CH4-H2O-CO2混合气体直接接触,两者进行强烈的热交换,进行第一次热量回收,使高温液态渣持有的热量用于吸热化学反应,生成甲醇(CH3OH),将液态高炉渣的显热转变为洁净的化学能;然后再经粒化渣填充床将CH4-H2O-CO2混合气体预热到反应所需温度,进行第二次热量回收,冷却后的高炉渣粒由下部的旋转卸料阀排出;具体步骤如下: In the granulation reactor, the liquid blast furnace slag is cooled and granulated under the centrifugal force of the rotor and the wind force of the reactive mixed gas (CH 4 -H 2 O-CO 2 ) ejected at high speed . 2 O-CO 2 mixed gas is in direct contact, and the two undergo intense heat exchange for the first heat recovery, so that the heat held by the high-temperature liquid slag is used for endothermic chemical reactions to generate methanol (CH 3 OH), and the liquid The sensible heat of blast furnace slag is converted into clean chemical energy; then the mixed gas of CH 4 -H 2 O-CO 2 is preheated to the temperature required for the reaction through the granulated slag packed bed, and the second heat recovery is carried out, and the cooled Blast furnace slag is discharged from the lower rotary discharge valve; the specific steps are as follows:
(1)从高炉经渣沟流出的液态高炉渣(温度﹥1400℃),流入中间包,经渣流管流入粒化反应器,在转速为1000~2300转/分钟、直径为80~180mm的转杯离心力作用下破碎成直径小于10mm的液滴,同时将占总量10~20%的CH4-H2O-CO2混合气体由粒化反应器圆周的环管经6~8个喷嘴沿切向喷入粒化反应器,高温液滴在混合气体的风力作用下进一步破碎和冷却,高温液滴凝固为高温渣粒; (1) The liquid blast furnace slag (temperature > 1400°C) flowing out from the blast furnace through the slag ditch flows into the tundish and flows into the granulation reactor through the slag flow pipe. Under the action of the centrifugal force of the rotor cup, it is broken into droplets with a diameter of less than 10mm, and at the same time, the mixed gas of CH 4 -H 2 O-CO 2 , which accounts for 10-20% of the total amount, is passed through 6-8 nozzles from the ring pipe around the granulation reactor Spray into the granulation reactor along the tangential direction, the high-temperature liquid droplets are further broken and cooled under the wind force of the mixed gas, and the high-temperature liquid droplets solidify into high-temperature slag particles;
(2)占总量80~90%的CH4-H2O-CO2混合气体由粒化渣填充床下部进入,与由喷嘴喷入的混合气体混合,与高温液滴和渣粒直接接触,在高炉渣的催化作用下,反应生成甲醇(CH3OH),完成第一次强烈的热交换,高温渣粒的温度在大于10℃/min的降温速率下降至800~900℃,高效地将液态高炉渣的显热转变为高附加利用价值的甲醇的化学能,此阶段为液态高炉渣的急冷段; (2) CH 4 -H 2 O-CO 2 mixed gas accounting for 80~90% of the total enters from the lower part of the granulated slag packed bed, mixes with the mixed gas injected from the nozzle, and directly contacts with high-temperature liquid droplets and slag particles , under the catalysis of blast furnace slag, the reaction generates methanol (CH 3 OH), and completes the first intense heat exchange. Transform the sensible heat of liquid blast furnace slag into the chemical energy of methanol with high added value. This stage is the quenching section of liquid blast furnace slag;
(3)在重力作用下,上述高温渣粒进入粒化反应器下方的粒化渣填充床并与由粒化渣填充床下方进入经粒化渣层逆流而上的CH4-H2O-CO2混合气体进行第二次热量交换,高温渣粒温度降至150℃,混合气体温度由常温升至700℃以上,此阶段为高炉渣的缓冷段;冷却后的高炉渣粒由底部的旋转卸料阀排出。 (3) Under the action of gravity, the above-mentioned high-temperature slag particles enter the granulated slag packed bed below the granulated slag packed bed and countercurrently flow upward with the CH 4 -H 2 O- The CO 2 mixed gas conducts the second heat exchange, the temperature of the high-temperature slag particles drops to 150°C, and the temperature of the mixed gas rises from normal temperature to above 700°C. This stage is the slow cooling section of the blast furnace slag; the cooled blast furnace slag particles are Rotate dump valve to discharge.
优点及效果 Advantages and effects
本发明的优点与积极效果如下: Advantage of the present invention and positive effect are as follows:
本发明提供了一种回收液态高炉渣高温显热的装置及方法,通过干式粒化、显热回收和能量转换三个过程,高效、经济、环保、节能地利用了液态高炉渣的高温余热资源,而且处理后的高炉渣可满足制造水泥的要求,生产的甲醇属于应用广泛的高附加值产品,符合未来“甲醇经济”发展需要。本发明解决了现有高炉渣处理方法中水淬法水耗大、热量不能有效回收利用和干式回收风渣比大、动力消耗较高、热能品质降低等问题,既回收了液态高炉渣的高品质显热,又保护了环境。与化学法制氢相比,该方法中所有的氢最终全部进入了甲醇,而没有因形成其他副产物而造成的损耗,也不需要燃烧部分甲烷来提供所需的热量,由此不会产生额外的有害CO2,而仅仅得到甲醇。 The invention provides a device and method for recovering high-temperature sensible heat of liquid blast furnace slag, through three processes of dry granulation, sensible heat recovery and energy conversion, the high-temperature waste heat of liquid blast furnace slag is utilized efficiently, economically, environmentally friendly and energy-saving resources, and the processed blast furnace slag can meet the requirements of cement manufacturing, and the produced methanol is a widely used high value-added product, which meets the development needs of the future "methanol economy". The invention solves the problems in the existing blast furnace slag treatment methods, such as large water consumption in the water quenching method, inability to effectively recycle heat, large ratio of dry-type recovery of blast furnace slag, high power consumption, and lower thermal energy quality, etc., and recovers liquid blast furnace slag High-quality sensible heat protects the environment. Compared with chemical hydrogen production, all the hydrogen in this method eventually enters methanol, without loss caused by the formation of other by-products, and does not need to burn part of methane to provide the required heat, thus no additional harmful CO 2 , and only methanol is obtained.
该方法合理,高效,单体设备简单、布置紧凑,处理能力大、易操作,比较利于在钢铁冶金过程余热资源回收与利用技术领域推广应用。 The method is reasonable, efficient, simple in single equipment, compact in layout, large in processing capacity, and easy to operate, and is more conducive to popularization and application in the technical field of waste heat resource recovery and utilization in iron and steel metallurgical processes.
附图说明 Description of drawings
图1是本发明回收液态高炉渣高温显热的装置结构示意图; Fig. 1 is a schematic structural view of the device for recovering high-temperature sensible heat of liquid blast furnace slag according to the present invention;
图2是图1中环管及喷嘴的结构示意图; Fig. 2 is the structural representation of annular pipe and nozzle among Fig. 1;
图3是图1中旋转布风器的结构示意图; Fig. 3 is a schematic structural view of the rotary air distributor in Fig. 1;
图4是图3的俯视图。 FIG. 4 is a top view of FIG. 3 .
附图标记说明: Explanation of reference signs:
1、中间包,2、渣流管,3、粒化反应器,4、转杯,5、变频调速电机,6、粒化渣填充床,7、环管,8、喷嘴,9、气体出口,10、旋转布风器,11、电机,12旋转卸料阀,13、底座,14、风帽,15、破渣筋,16、虚拟圆,17、气体进口。 1. Tundish, 2. Slag flow pipe, 3. Granulation reactor, 4. Rotor cup, 5. Frequency conversion motor, 6. Granulated slag packed bed, 7. Ring pipe, 8. Nozzle, 9. Gas Outlet, 10, rotary air distributor, 11, motor, 12 rotary discharge valve, 13, base, 14, hood, 15, slag breaking tendon, 16, virtual circle, 17, gas inlet.
具体实施方式 detailed description
下面结合附图对本发明做进一步的说明: Below in conjunction with accompanying drawing, the present invention will be further described:
本发明提出了一种回收液态高炉渣高温显热的装置,其特征在于:如图1中所示,该装置主要包括中间包1、渣流管2、粒化反应器3、转杯4、变频调速电机5、粒化渣填充床6、环管7、喷嘴8、气体出口9、旋转布风器10、电机11、旋转卸料阀12;在粒化反应器3的顶部设置有液态高炉渣进口(渣流管2)和气体出口9,渣流管2上方为中间包1,粒化反应器3内部设有转杯4和驱动转杯4的变频调速电机5,在粒化反应器3的四周器壁上设有6~8个喷嘴8,喷嘴8与环管7相连;粒化反应器3的底部与粒化渣填充床6顶部相连;粒化渣填充床6的内部设有旋转布风器10,旋转布风器10与驱动其旋转的电机11相连,气体进口17与旋转布风器10相连,旋转布风器10下方还设有旋转卸料阀12。 The present invention proposes a device for recovering high-temperature sensible heat of liquid blast furnace slag, which is characterized in that: as shown in Figure 1, the device mainly includes a tundish 1, a slag flow pipe 2, a granulation reactor 3, a rotor 4, Frequency conversion motor 5, granulated slag packed bed 6, ring pipe 7, nozzle 8, gas outlet 9, rotary air distributor 10, motor 11, rotary discharge valve 12; Blast furnace slag inlet (slag flow pipe 2) and gas outlet 9, above the slag flow pipe 2 is a tundish 1, inside the granulation reactor 3 there is a rotor 4 and a frequency conversion motor 5 for driving the rotor 4, in the granulation There are 6~8 nozzles 8 on the surrounding walls of the reactor 3, and the nozzles 8 are connected to the ring pipe 7; the bottom of the granulation reactor 3 is connected to the top of the granulated slag packed bed 6; the inside of the granulated slag packed bed 6 A rotary air distributor 10 is provided, and the rotary air distributor 10 is connected with a motor 11 driving its rotation, and the gas inlet 17 is connected with the rotary air distributor 10 , and a rotary discharge valve 12 is also provided under the rotary air distributor 10 .
所述的6~8个喷嘴8的轴线相切于一虚拟圆16,此虚拟圆与转杯4的上表面在同一平面上,从喷嘴8喷入的气体沿粒化反应器3的切向进入,且其旋流方向与转杯4旋转方向相反。 The axes of the 6 to 8 nozzles 8 are tangent to a virtual circle 16, which is on the same plane as the upper surface of the rotor 4, and the gas injected from the nozzles 8 is along the tangential direction of the granulation reactor 3. Enter, and its swirling direction is opposite to the rotating direction of rotor 4.
所述的旋转布风器10包括底座13、风帽14和破渣筋15,底座13上方设有风帽14,风帽14上设有破渣筋15。 The rotary air distributor 10 includes a base 13 , a wind cap 14 and a slag breaking rib 15 , the hood 14 is arranged above the base 13 , and the slag breaking rib 15 is arranged on the wind cap 14 .
所述风帽14设置为3~5层,每层风帽板内径、外径处均采用折边结构。内径处的折边可使下吹带出物减少,外径处折边用以阻挡较大渣块挤入风帽板间夹层使风帽堵塞。折边结构能较好地解决带出物及炉渣堵塞的问题,同时可改变出风口的出风方向,增加风向周边直吹的阻力,加大炉子中间的通风量,使布风趋向均匀。 The hood 14 is arranged in 3 to 5 layers, and the inner diameter and outer diameter of each layer of the hood plate adopt a hemming structure. The folded edge at the inner diameter can reduce the blown-out matter, and the folded edge at the outer diameter is used to prevent larger slag from squeezing into the interlayer between the hood plates to block the hood. The folded edge structure can better solve the problem of carryover and slag blockage, and at the same time, it can change the direction of the air outlet, increase the resistance of the wind blowing directly to the periphery, increase the ventilation in the middle of the furnace, and make the air distribution tend to be uniform.
所述风帽14上设置6条破渣筋15,破渣筋头向上翘起,形似耙齿,可将疤块切碎排下,破渣能力强,沿旋转布风器10转动方向,破渣筋15的前方边缘高于后方边缘,形成刀刃,有利于切碎渣块。破渣筋头焊耐磨合金,以延长使用寿命。 The hood 14 is provided with 6 slag-breaking tendons 15, the slag-breaking tendons are tilted upwards, shaped like rake teeth, can chop and discharge the scars, have strong slag-breaking ability, and can break slag along the direction of rotation of the rotary air distributor 10 The front edge of rib 15 is higher than the rear edge, forming a knife edge, which is beneficial to chopping slag. The slag-breaking rib head is welded with wear-resistant alloy to prolong the service life.
所述风帽14可以根据各层在粒化渣填充床6内所占比例和各层上方渣层厚度来布置通风面积。 The ventilation area of the wind cap 14 can be arranged according to the proportion of each layer in the granulated slag packed bed 6 and the thickness of the slag layer above each layer.
一种如上所述的液态高炉渣高温显热回收装置的高温显热回收方法,其特征在于:利用液态高炉渣的高温显热进行CH4-H2O-CO2重整反应生产甲醇,高炉渣既是传热介质,又是催化剂,冷却后的高炉渣用于生产水泥。 A high-temperature sensible heat recovery method for a liquid blast furnace slag high-temperature sensible heat recovery device as described above, characterized in that: using the high-temperature sensible heat of liquid blast furnace slag to carry out CH 4 -H 2 O-CO 2 reforming reaction to produce methanol, high The slag is both a heat transfer medium and a catalyst, and the cooled blast furnace slag is used to produce cement.
所述CH4-H2O-CO2混合气体中CH4:H2O:CO2的摩尔比为3:2:1,混合气体分两部分,约占总量(物质的量)10~20%的混合气体用于液态高炉渣的粒化和急冷,约占总量(物质的量)80~90%的混合气体用于粒化后高炉渣的冷却,最终全部混合气体发生重整化学反应生成甲醇。 The molar ratio of CH 4 : H 2 O : CO 2 in the CH 4 -H 2 O-CO 2 mixed gas is 3:2:1, and the mixed gas is divided into two parts, accounting for about 10~ 20% of the mixed gas is used for granulation and quenching of liquid blast furnace slag, about 80-90% of the total amount (substance amount) is used for cooling the granulated blast furnace slag, and finally all the mixed gas undergoes reforming chemical The reaction produces methanol.
在粒化反应器内,液态高炉渣在转杯离心力和高速喷出的反应性混合气体(CH4-H2O-CO2)的风力作用下冷却粒化,高温渣粒与CH4-H2O-CO2混合气体直接接触,两者进行强烈的热交换,进行第一次热量回收,使高温液态渣持有的热量用于吸热化学反应,生成甲醇(CH3OH),即高效地将液态高炉渣的显热转变为洁净的化学能;然后再经粒化渣填充床将CH4-H2O-CO2混合气体预热到反应所需温度,进行第二次热量回收,冷却后的高炉渣粒由下部的旋转卸料阀排出;具体步骤如下: In the granulation reactor, the liquid blast furnace slag is cooled and granulated under the centrifugal force of the rotor and the wind force of the reactive mixed gas (CH 4 -H 2 O-CO 2 ) ejected at high speed . 2 O-CO 2 mixed gas is in direct contact, and the two undergo intense heat exchange for the first heat recovery, so that the heat held by the high-temperature liquid slag is used for endothermic chemical reactions to generate methanol (CH 3 OH), that is, high-efficiency The sensible heat of liquid blast furnace slag is transformed into clean chemical energy; then the mixed gas of CH 4 -H 2 O-CO 2 is preheated to the temperature required for the reaction through the granulated slag packed bed, and the second heat recovery is carried out. The cooled blast furnace slag is discharged from the lower rotary discharge valve; the specific steps are as follows:
(1)从高炉经渣沟流出的液态高炉渣(温度﹥1400℃),流入中间包1,经渣流管2流入下方的粒化反应器3内,落到转速为1000~2300转/分钟、直径为80~180mm的转杯4上,在离心力作用下沿切向方向甩出,被破碎成直径小于10mm的液滴和渣粒,同时将占总量10~20%的CH4-H2O-CO2混合气体由粒化反应器圆周的环管经6~8个喷嘴沿切向喷入粒化反应器,高温液滴和渣粒在混合气体的风力作用下进一步破碎和冷却,最后全部高温液滴都凝固为高温渣粒。喷嘴8为矩形时效果较好。 (1) The liquid blast furnace slag (temperature >1400°C) flowing out from the blast furnace through the slag ditch flows into the tundish 1, flows into the granulation reactor 3 below through the slag flow pipe 2, and falls to the , on the rotor 4 with a diameter of 80-180mm, it is thrown out in the tangential direction under the action of centrifugal force, and is broken into droplets and slag particles with a diameter of less than 10mm, and at the same time, CH 4 -H which accounts for 10-20% of the total 2 O-CO 2 mixed gas is sprayed tangentially into the granulation reactor from the ring pipe around the granulation reactor through 6~8 nozzles, and the high-temperature liquid droplets and slag particles are further broken and cooled by the wind force of the mixed gas. Finally, all the high-temperature droplets are solidified into high-temperature slag particles. The effect is better when the nozzle 8 is rectangular.
(2)占总量80~90%的CH4-H2O-CO2混合气体经粒化渣填充床6预热后由其下部进入,与由喷嘴8沿反方向喷入的占总量的10~20%混合气体混合,与高温液滴和渣粒直接接触,以高炉渣为催化剂和传热介质,在高炉渣的催化作用下,反应生成甲醇(CH3OH),完成第一次强烈的热交换,甲醇由气体出口9排出粒化反应器3;高温渣粒的温度在大于10℃/min的降温速率下降至800~900℃,高效地将液态高炉渣的显热转变为高附加利用价值的甲醇的化学能,此阶段为液态高炉渣的急冷段。 (2) CH 4 -H 2 O-CO 2 mixed gas accounting for 80~90% of the total amount enters from the lower part of the granulated slag packed bed 6 after being preheated, and the total amount injected from the nozzle 8 in the opposite direction 10~20% of the mixed gas is mixed with high-temperature liquid droplets and slag particles, and the blast furnace slag is used as the catalyst and heat transfer medium. Under the catalysis of the blast furnace slag, methanol (CH 3 OH) is reacted to complete the first time Strong heat exchange, methanol is discharged from the granulation reactor 3 through the gas outlet 9; the temperature of the high-temperature slag drops to 800~900°C at a cooling rate of more than 10°C/min, which efficiently converts the sensible heat of the liquid blast furnace slag into high The chemical energy of methanol with added value, this stage is the quenching section of liquid blast furnace slag.
(3)在重力作用下,上述高温渣粒进入粒化反应器3下方的粒化渣填充床6并与由粒化渣填充床6下方进入经粒化渣层逆流而上的摩尔比为3:2:1的CH4-H2O-CO2混合气体进行第二次热量交换,高温渣粒温度降至150℃左右,混合气体温度由常温升至700℃以上,此阶段为高炉渣的缓冷段;冷却后的高炉渣粒由底部的旋转卸料阀12排出。 (3) Under the action of gravity, the above-mentioned high-temperature slag particles enter the granulated slag packed bed 6 below the granulated slag packed bed 6, and the molar ratio of the above-mentioned high-temperature slag particles entering the granulated slag layer countercurrently from below the granulated slag packed bed 6 is 3 : 2:1 CH 4 -H 2 O-CO 2 mixed gas for the second heat exchange, the temperature of high-temperature slag drops to about 150°C, and the temperature of the mixed gas rises from normal temperature to above 700°C. This stage is the blast furnace slag Slow cooling section: the cooled blast furnace slag is discharged from the rotary discharge valve 12 at the bottom.
用于冷却高炉渣的混合气体由设在粒化渣填充床6下部的气体进口17进入,经旋转布风器10均匀分布后,进入粒化渣填充床6,并与缓慢下降的高炉渣层进行逆流换热,使高炉渣进一步冷却,混合气体经与高炉渣层换热后被预热到700℃以上,从粒化渣填充床6顶部进入粒化反应器3,在粒化反应器3内与由喷嘴8喷入的混合气体汇合,发生反应生成甲醇。 The mixed gas used to cool the blast furnace slag enters from the gas inlet 17 located at the lower part of the granulated slag packed bed 6, and after being evenly distributed by the rotary air distributor 10, enters the granulated slag packed bed 6 and is mixed with the slowly descending blast furnace slag layer. Countercurrent heat exchange is carried out to further cool the blast furnace slag, and the mixed gas is preheated to above 700°C after heat exchange with the blast furnace slag layer, and enters the granulation reactor 3 from the top of the granulated slag packed bed 6, and in the granulation reactor 3 The gas inside is merged with the mixed gas injected from the nozzle 8, and reacts to generate methanol.
本发明的方法主要是利用液态高炉渣的高温显热为甲醇的合成提供所需的热量,在整个流程中,高炉渣不仅起到传热介质的作用,还是一种很好的催化剂。液态高炉渣的处理过程是一个放热过程,按照平均比热1.1kJ/(kg·℃)计算,高炉渣从1500℃冷却到环境温度,一吨高炉渣带走的显热大约相当于56kg标准煤完全燃烧所放出的热量,而CH4-H2O-CO2混合气体合成甲醇中,CH4-H2O蒸汽重整反应及CH4-CO2干法重整反应是强烈的吸热反应,其反应方程式为: The method of the invention mainly utilizes the high-temperature sensible heat of liquid blast furnace slag to provide required heat for the synthesis of methanol. In the whole process, the blast furnace slag not only functions as a heat transfer medium, but also serves as a good catalyst. The treatment process of liquid blast furnace slag is an exothermic process. Calculated according to the average specific heat of 1.1kJ/(kg·℃), the blast furnace slag is cooled from 1500°C to ambient temperature, and the sensible heat taken away by one ton of blast furnace slag is equivalent to about 56kg standard The heat released by the complete combustion of coal, and the CH 4 -H 2 O-CO 2 mixed gas synthesis of methanol, the CH 4 -H 2 O steam reforming reaction and the CH 4 -CO 2 dry reforming reaction are strongly endothermic reaction, the reaction equation is:
蒸汽重整: Steam reforming:
干法重整: Dry reforming:
合成甲醇: Synthetic Methanol:
以1吨液态高炉渣为基础进行计算, Calculated on the basis of 1 ton of liquid blast furnace slag,
在粒化反应器内,液态高炉渣进行急冷,温度由1500℃降为800℃,则: In the granulation reactor, the liquid blast furnace slag is quenched and the temperature is reduced from 1500°C to 800°C, then:
高炉渣提供的热量: Heat provided by blast furnace slag:
根据热平衡方程计算可知,在急冷段高炉渣提供的热量可使208.45m3CH4、111.67kgH2O和69.48m3CO2反应合成397kg甲醇(CH3OH)。 According to the calculation of the heat balance equation, it can be known that the heat provided by the blast furnace slag in the quenching section can make 208.45m 3 CH 4 , 111.67kg H 2 O and 69.48m 3 CO 2 react to synthesize 397kg methanol (CH 3 OH).
在粒化渣填充床内,高温渣粒进行缓冷,温度由800℃降为150℃,则: In the packed bed of granulated slag, the high-temperature slag particles are slowly cooled, and the temperature drops from 800°C to 150°C, then:
高炉渣提供的热量: Heat provided by blast furnace slag:
进入粒化反应器的CH4-H2O-CO2混合气体的物理热: Physical heat of CH 4 -H 2 O-CO 2 mixed gas entering the granulation reactor:
CH4的物理热: Physical heat of CH4 :
H2O的物理热: Physical heat of H2O :
CO2的物理热: Physical heat of CO2 :
CH4-H2O-CO2混合气体预热所需总热量为: The total heat required for preheating CH 4 -H 2 O-CO 2 mixed gas is:
此换热过程所需换热效率: The heat transfer efficiency required for this heat transfer process is:
。 .
可见,无论在粒化反应器内的急冷段还是粒化渣填充床的缓冷段,高炉渣的显热都足以满足反应和换热的热量需求。 It can be seen that the sensible heat of blast furnace slag is sufficient to meet the heat demand of reaction and heat exchange no matter in the rapid cooling section of the granulation reactor or the slow cooling section of the granulated slag packed bed.
在该过程中,合成甲醇吸收液态高炉渣冷却放出的热量而达到甲烷蒸汽重整和干法重整合成甲醇的目的,不仅使液态高炉渣得以冷却,而且解决了现有高炉渣处理方法中水淬法水耗大、热量不能有效回收利用和干式回收风渣比大、动力消耗较高、热能品质降低等问题,既回收了液态高炉渣的高品质显热,又保护了环境。与CH4-H2O的蒸汽重整反应制氢和CH4-CO2的干法重整反应制氢相比,该方法中利用高炉渣作催化剂,省去了CH4-H2O蒸汽重整和CH4-CO2干法重整所需要的专业催化剂及其制备成本,同时,该方法中所有的氢最终全部进入了甲醇,而没有因形成其他副产物而造成的损耗,也不需要燃烧部分甲烷来提供所需的热量,由此不会产生额外的有害CO2,而仅仅得到甲醇。 In this process, synthetic methanol absorbs the heat released by the cooling of liquid blast furnace slag to achieve the purpose of steam reforming of methane and dry recombination into methanol, which not only enables liquid blast furnace slag to be cooled, but also solves the problem of water in the existing blast furnace slag treatment method. The quenching method has problems such as large water consumption, ineffective recovery of heat, large ratio of dry recovery of blast furnace slag, high power consumption, and reduced thermal energy quality. It not only recovers the high-quality sensible heat of liquid blast furnace slag, but also protects the environment. Compared with the steam reforming reaction of CH 4 -H 2 O to produce hydrogen and the dry reforming reaction of CH 4 -CO 2 to produce hydrogen, this method uses blast furnace slag as a catalyst and saves the CH 4 -H 2 O steam Reforming and CH 4 -CO 2 dry reforming required professional catalysts and their preparation costs. At the same time, all the hydrogen in this method ends up in methanol without loss due to the formation of other by-products, nor Part of the methane needs to be combusted to provide the required heat so that no additional harmful CO2 is produced, but only methanol.
综合以上可以看到,将液态高炉渣显热用于CH4-H2O-CO2混合气体合成甲醇,每吨高炉渣可产生397kg甲醇。 Based on the above, it can be seen that when the sensible heat of liquid blast furnace slag is used to synthesize methanol from the mixed gas of CH 4 -H 2 O-CO 2 , 397kg of methanol can be produced per ton of blast furnace slag.
甲醇是一种方便安全的储能物质,是最简单的氧化态液体烃类,也是最基本的有机化工原料,自身产业链长,涉及化工、建材、能源、医药、农药等众多行业。因此,以甲醇替代化石燃料作为能源储存、燃料和合成烃及产品的经济,即所谓的“甲醇经济”,是应对油气能源问题的一条解决途径, 也是一种切实可行的使人类摆脱对日益减少的石油和天然气(甚至煤炭)的一来的新途径,还可以减轻因为过量燃烧导致的全球变暖问题。而以氢作为储能和燃料的广泛使用,即所谓的“氢经济”,或许可以用于大型的静态装置,但可行性相对较小,因为极易挥发的氢气非常难以被操作和使用。氢气易挥发易爆炸的特性不但需要建立全新的、极其昂贵的基础设施,而且需要发展严密的对严重安全隐患的检测和控制系统。作为取代的方法,氢气可用来将无所不在的CO2转化为甲醇以及各种相关产品。 Methanol is a convenient and safe energy storage substance, the simplest oxidized liquid hydrocarbon, and the most basic organic chemical raw material. It has a long industrial chain, involving many industries such as chemical industry, building materials, energy, medicine, and pesticides. Therefore, the economy of replacing fossil fuels with methanol as energy storage, fuel, and synthesis of hydrocarbons and products, the so-called "methanol economy", is a solution to the problem of oil and gas energy, and it is also a feasible way to get rid of the dwindling demand for human beings. A new approach to oil and gas (and even coal) could also mitigate global warming caused by excessive burning. The widespread use of hydrogen as energy storage and fuel, the so-called "hydrogen economy", may be possible for large static installations, but the feasibility is relatively small, because the extremely volatile hydrogen is very difficult to handle and use. The volatile and explosive nature of hydrogen requires not only the establishment of a new and extremely expensive infrastructure, but also the development of a rigorous detection and control system for serious safety hazards. As an alternative, hydrogen can be used to convert the ubiquitous CO2 to methanol and various related products.
本发明提供的方法中,CH4可以来自于天然气或焦炉煤气、CO2可以从高含量的钢铁工业排放废气中获得。 In the method provided by the present invention, CH 4 can come from natural gas or coke oven gas, and CO 2 can be obtained from high-content waste gas discharged from the iron and steel industry.
本发明利用液态高炉渣的高温显热进行CH4-H2O-CO2重整反应生产甲醇,冷却后的高炉渣用于生产水泥。本发明通过干式粒化、显热回收和能量转换三个过程,高效、经济、环保、节能地利用了液态高炉渣的高温余热资源,而且处理后的高炉渣可满足制造水泥的要求,生产的甲醇属于应用广泛的高附加值产品,符合未来“甲醇经济”发展需要。本发明解决了现有高炉渣处理方法中水淬法水耗大、热量不能有效回收利用和干式回收风渣比大、动力消耗较高、热能品质降低等问题,既回收了液态高炉渣的高品质显热,又保护了环境。与化学法制氢相比,该方法中所有的氢最终全部进入了甲醇,而没有因形成其他副产物而造成的损耗,也不需要燃烧部分甲烷来提供所需的热量,由此不会产生额外的有害CO2,而仅仅得到甲醇。该方法合理,高效,单体设备简单、布置紧凑,处理能力大、易操作,比较利于在钢铁冶金过程余热资源回收与利用技术领域推广应用。 The invention utilizes the high-temperature sensible heat of liquid blast furnace slag to carry out CH4 - H2O - CO2 reforming reaction to produce methanol, and the cooled blast furnace slag is used to produce cement. Through three processes of dry granulation, sensible heat recovery and energy conversion, the present invention utilizes the high-temperature waste heat resource of liquid blast furnace slag in an efficient, economical, environmentally friendly and energy-saving manner, and the processed blast furnace slag can meet the requirements for manufacturing cement, and the production Methanol is a widely used high value-added product, which meets the development needs of the "methanol economy" in the future. The invention solves the problems in the existing blast furnace slag treatment methods, such as large water consumption in the water quenching method, inability to effectively recycle heat, large ratio of dry-type recovery of blast furnace slag, high power consumption, and lower thermal energy quality, etc., and recovers liquid blast furnace slag High-quality sensible heat protects the environment. Compared with chemical hydrogen production, all the hydrogen in this method eventually enters methanol, without loss caused by the formation of other by-products, and does not need to burn part of methane to provide the required heat, thus no additional harmful CO 2 , and only methanol is obtained. The method is reasonable, efficient, simple in single equipment, compact in layout, large in processing capacity, and easy to operate, and is more conducive to popularization and application in the technical field of waste heat resource recovery and utilization in iron and steel metallurgical processes.
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