CN107904353A - A kind of converter gas waste heat reclaiming process - Google Patents
A kind of converter gas waste heat reclaiming process Download PDFInfo
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- CN107904353A CN107904353A CN201711182459.8A CN201711182459A CN107904353A CN 107904353 A CN107904353 A CN 107904353A CN 201711182459 A CN201711182459 A CN 201711182459A CN 107904353 A CN107904353 A CN 107904353A
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- 239000002918 waste heat Substances 0.000 title claims abstract description 72
- 239000007789 gas Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 20
- 239000003546 flue gas Substances 0.000 claims abstract description 99
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 95
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 54
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 31
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000000746 purification Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 48
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 31
- 229910052742 iron Inorganic materials 0.000 claims description 15
- 238000006479 redox reaction Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000012717 electrostatic precipitator Substances 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000009776 industrial production Methods 0.000 claims description 3
- 230000002269 spontaneous effect Effects 0.000 claims description 2
- 239000002075 main ingredient Substances 0.000 claims 4
- 229910017435 S2 In Inorganic materials 0.000 claims 1
- 238000007599 discharging Methods 0.000 claims 1
- 238000004064 recycling Methods 0.000 claims 1
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000010248 power generation Methods 0.000 description 7
- 239000002994 raw material Substances 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000003541 multi-stage reaction Methods 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 238000012932 thermodynamic analysis Methods 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/10—Arrangements for using waste heat
- F27D17/15—Arrangements for using waste heat using boilers
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C2100/00—Exhaust gas
- C21C2100/02—Treatment of the exhaust gas
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C2100/00—Exhaust gas
- C21C2100/06—Energy from waste gas used in other processes
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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
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
-
- 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
- Y02P10/25—Process efficiency
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
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- Metallurgy (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Treating Waste Gases (AREA)
Abstract
本发明公开了一种转炉烟气余热回收工艺，包括如下步骤：S1、将从转炉中排出的烟气输入壹号余热锅炉，烟气在壹号余热锅炉内换热后排出；S2、将壹号余热锅炉排出的烟气输入二氧化碳发生装置中，烟气与铁矿石发生自发的氧化还原反应后排出；S3、将二氧化碳发生装置排出的烟气输入贰号余热锅炉，烟气在贰号余热锅炉内换热后排出；S4、将贰号余热锅炉排出的烟气输到换热装置，烟气在换热装置内换热后排出；S5、将换热装置排出的烟气经静电除尘装置后输入二氧化碳提纯冷却回收装置，收集CO2气体。与现有技术相比，本发明的有益效果是能够实现烟气余热的完全利用，实现零排放、无污染；实用性强，可大面积推广。
The invention discloses a waste heat recovery process of converter flue gas, comprising the following steps: S1, input the flue gas discharged from the converter into No. The flue gas discharged from the waste heat boiler No. Discharge after heat exchange in the boiler; S4, transfer the flue gas discharged from the No. Then enter the carbon dioxide purification cooling recovery device to collect CO2 gas. Compared with the prior art, the beneficial effect of the present invention is that it can fully utilize the waste heat of flue gas, realize zero discharge and no pollution; it has strong practicability and can be popularized in a large area.
Description
技术领域technical field
本发明属于冶金工业余热利用技术领域，特别涉及一种转炉烟气余热回收工艺。The invention belongs to the technical field of waste heat utilization in the metallurgical industry, and in particular relates to a process for recovering waste heat from converter flue gas.
背景技术Background technique
在目前转炉烟气处理的流程中，通常使用的是干法(LT)和湿法(OG)，干法(LT)先经过烟道降温后，进行喷水冷却，通过静电除尘器除去杂质，随后回收煤气进行放散或点燃。湿法(OG)是在经过两次文氏管，两次脱水后将煤气回收、放散或点燃。中间过程中烟气温度要从1500℃左右骤降到300℃以下，这个过程不仅造成能量的损失，而且在降温的过程中需要大量的水进行冷却。In the current process of converter flue gas treatment, dry method (LT) and wet method (OG) are usually used. The dry method (LT) is first cooled by the flue, then sprayed with water to cool, and the impurities are removed by an electrostatic precipitator. The recovered gas is then vented or ignited. Wet method (OG) is to recover, release or ignite the gas after going through the Venturi tube twice and dehydrating twice. During the intermediate process, the flue gas temperature will drop from about 1500°C to below 300°C. This process not only causes energy loss, but also requires a large amount of water for cooling during the cooling process.
经过热力学分析知CO与铁矿石在800℃的温度下能够自发的发生氧化还原反应，而且这个氧化还原反应是放热反应，所以导致这个反应中环境的温度不会发生太大的改变，没有热损失。After thermodynamic analysis, it is known that CO and iron ore can spontaneously undergo oxidation-reduction reaction at a temperature of 800°C, and this oxidation-reduction reaction is an exothermic reaction, so the temperature of the environment in this reaction will not change much. heat loss.
发明内容Contents of the invention
本发明的目的在于，针对现有转炉烟气处理工艺中存在的上述问题，提供一种转炉烟气余热回收工艺。The object of the present invention is to provide a converter flue gas waste heat recovery process for the above-mentioned problems existing in the existing converter flue gas treatment process.
为了实现上述目的，本申请采用的技术方案为：一种转炉烟气余热回收工艺，包括如下步骤：In order to achieve the above purpose, the technical solution adopted in this application is: a converter flue gas waste heat recovery process, including the following steps:
S1、将从转炉中排出的温度为1300℃～1800℃，且主要成份为CO的烟气经烟道输送入壹号余热锅炉，烟气在壹号余热锅炉内与水进行换热后，壹号余热锅炉内的部分水转换成水蒸气，烟气温度下降到900℃～1000℃，壹号余热锅炉将热交换后的烟气排出；S1. The flue gas discharged from the converter with a temperature of 1300 ℃ ~ 1800 ℃ and whose main component is CO is transported into the No. 1 waste heat boiler through the flue. After the flue gas exchanges heat with water in the No. 1 waste heat boiler, the first Part of the water in the No. 1 waste heat boiler is converted into water vapor, and the temperature of the flue gas drops to 900 ° C ~ 1000 ° C. The No. 1 waste heat boiler discharges the flue gas after heat exchange;
S2、将壹号余热锅炉排出的烟气输送到二氧化碳发生装置中，所述二氧化碳发生装置中设置有铁矿石，壹号余热锅炉排出的烟气与铁矿石发生自发的氧化还原反应后产生主要成份为CO2的烟气，二氧化碳发生装置将主要成份为CO2的烟气排出；S2. Transport the flue gas discharged from the No. 1 waste heat boiler to the carbon dioxide generator. The carbon dioxide generator is equipped with iron ore. The flue gas discharged from the No. 1 waste heat boiler undergoes a spontaneous oxidation-reduction reaction with the iron ore to produce The flue gas whose main component is CO 2 , the carbon dioxide generator will discharge the flue gas whose main component is CO 2 ;
S3、将二氧化碳发生装置排出的主要成份为CO2的烟气输送到贰号余热锅炉，烟气在贰号余热锅炉内与水进行换热后，贰号余热锅炉内的部分水转换成水蒸气，烟气温度下降到250℃～350℃，贰号余热锅炉将热交换后的烟气排出；S3. Transport the flue gas mainly composed of CO 2 discharged from the carbon dioxide generator to the No. 2 waste heat boiler. After the flue gas exchanges heat with water in the No. 2 waste heat boiler, part of the water in the No. 2 waste heat boiler is converted into water vapor , the temperature of the flue gas drops to 250°C to 350°C, and the No. 2 waste heat boiler discharges the flue gas after heat exchange;
S4、将贰号余热锅炉排出的烟气输送到换热装置，烟气在换热装置内与水进行换热后，换热装置中水的温度升高且部分水转化成水蒸气，烟气的温度下降到50℃～70℃，换热装置将换热后的烟气排出；S4. Transport the flue gas discharged from No. 2 waste heat boiler to the heat exchange device. After the flue gas exchanges heat with water in the heat exchange device, the temperature of the water in the heat exchange device rises and part of the water is converted into water vapor. The flue gas When the temperature drops to 50℃～70℃, the heat exchange device will discharge the flue gas after heat exchange;
S5、将换热装置排出的烟气经静电除尘装置进行除尘后输送入二氧化碳提纯冷却回收装置，收集CO2气体。S5. The flue gas discharged from the heat exchange device is dedusted by the electrostatic precipitator and then sent to the carbon dioxide purification cooling recovery device to collect CO 2 gas.
进一步的，壹号余热锅炉产生的水蒸气与贰号余热锅炉产生的水蒸气经蒸汽稳压罐稳压后用于发电设备。Furthermore, the water vapor generated by the No. 1 waste heat boiler and the No. 2 waste heat boiler are used for power generation equipment after the pressure is stabilized by the steam surge tank.
进一步的，二氧化碳发生装置内分层布置铁矿石，并设置多级反应区，二氧化碳发生装置排出的主要成份为CO2的烟气的温度为900℃～1000℃。Further, the iron ore is arranged in layers in the carbon dioxide generator, and multi-stage reaction zones are set up. The temperature of the flue gas discharged from the carbon dioxide generator, whose main component is CO 2 , is 900°C-1000°C.
进一步的，换热装置产生的热水和水蒸气用于民用余热开发。Furthermore, the hot water and steam generated by the heat exchange device are used for civil waste heat development.
进一步的，所述的民用余热开发包括工业生产和温泉旅游开发。Further, the development of waste heat for civil use includes industrial production and hot spring tourism development.
与现有技术相比，本发明的有益效果是：Compared with prior art, the beneficial effect of the present invention is:
(1)本发明通过CO与铁矿石的氧化还原反应，不仅将烟气中的有毒CO转换成无毒的CO2，而且确保烟气热量未损失，保证生产工艺的安全，还为炼铁生产提供原料。(1) Through the oxidation-reduction reaction of CO and iron ore, the present invention not only converts the toxic CO in the flue gas into non-toxic CO 2 , but also ensures that the heat of the flue gas is not lost, ensuring the safety of the production process, and is also an important tool for ironmaking Production provides raw materials.
(2)烟气与壹号余热锅炉内的水和贰号余热锅炉内的水进行换热产生的水蒸气用于发电，烟气与换热装置内的水进行换热产生的热水和水蒸气用于民用余热开发，最大化的降低烟气的余热损失，发掘烟气的经济利益，烟气热效率提高到85％。(2) The steam generated by the heat exchange between the flue gas and the water in the No. 1 waste heat boiler and the water in the No. 2 waste heat boiler is used for power generation, and the hot water and water produced by the heat exchange between the flue gas and the water in the heat exchange device The steam is used for civil waste heat development, which minimizes the waste heat loss of the flue gas, explores the economic benefits of the flue gas, and increases the thermal efficiency of the flue gas to 85%.
(3)本发明通过静电除尘设备对从换热装置内排出的烟气进行尾气收集，替代了炼铁生产中高温煅烧石灰石生产CO2的工艺，节省大量能源，同时实现转炉烟气的零排放。(3) The present invention collects the tail gas from the flue gas discharged from the heat exchange device through the electrostatic dust removal equipment, which replaces the high-temperature calcined limestone production process in ironmaking production, saves a lot of energy, and realizes zero emission of converter flue gas at the same time .
相较于现有的转炉烟气回收工艺，本发明不仅能够实现烟气余热的完全利用，还可实现转炉炼钢零排放、无污染；安全系数和热效率相对于现有方法均有大幅度提升，实用性强，可大面积推广。Compared with the existing converter flue gas recovery process, the present invention can not only realize the complete utilization of flue gas waste heat, but also realize zero emission and no pollution in converter steelmaking; the safety factor and thermal efficiency are greatly improved compared with the existing methods , strong practicability, and can be popularized in a large area.
附图说明Description of drawings
图1是本发明具体实施例中的一种转炉烟气余热回收工艺流程图。Fig. 1 is a flow chart of a converter flue gas waste heat recovery process in a specific embodiment of the present invention.
具体实施方式Detailed ways
为了使本发明的技术手段、创作特征、达到目的与功效易于明白了解，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述。In order to make the technical means, creative features, goals and effects of the present invention easy to understand, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention.
实施例1Example 1
如图1所示，一种转炉烟气余热回收工艺，包括如下步骤：As shown in Figure 1, a converter flue gas waste heat recovery process includes the following steps:
S1、将从转炉中排出的温度为1300℃～1800℃，且主要成份为CO的烟气经烟道输送入壹号余热锅炉，烟气在壹号余热锅炉内与水进行换热后，壹号余热锅炉内的部分水转换成水蒸气，经过传热计算得到烟气温度下降到900℃～1000℃，壹号余热锅炉将烟气排出。壹号余热锅炉产生的水蒸气经蒸汽稳压罐稳压后用于发电设备进行发电，蒸汽稳压罐是为了确保水蒸汽能够持续稳定供应给发电设备；S1. The flue gas discharged from the converter with a temperature of 1300 ℃ ~ 1800 ℃ and whose main component is CO is transported into the No. 1 waste heat boiler through the flue. After the flue gas exchanges heat with water in the No. 1 waste heat boiler, the first Part of the water in the No. 1 waste heat boiler is converted into water vapor. After heat transfer calculation, the temperature of the flue gas drops to 900 ℃ ~ 1000 ℃, and the No. 1 waste heat boiler discharges the flue gas. The water vapor generated by the No. 1 waste heat boiler is stabilized by the steam surge tank and used for power generation equipment to generate electricity. The steam surge tank is to ensure that the water vapor can be continuously and stably supplied to the power generation equipment;
S2、将壹号余热锅炉排出的烟气输送到二氧化碳发生装置中，所述二氧化碳发生装置中设置有铁矿石，壹号余热锅炉排出的烟气与铁矿石发生自发的氧化还原反应后烟气的主要成份为CO2，二氧化碳发生装置将主要成份为CO2的烟气排出。铁矿石分层布置，并在二氧化碳发生装置设置多级反应区，铁矿石的主要成份为Fe2O3，在环境温度在800℃左右的情况下Fe2O3能够与壹号余热锅炉排出烟气中的CO自发的发生氧化还原反应，不需外界供热，铁矿石被还原成Fe3O4和FeO，CO被氧化成CO2，所以二氧化碳发生装置排出的烟气的主要成份为CO2。经过热力学分析，表明铁矿石与CO的反应是放热反应，所以导致二氧化碳发生装置内烟气的温度没有发生改变，二氧化碳发生装置排出的烟气的温度仍为900℃～1000℃。因此，在二氧化碳发生装置中，烟气热量未损失，并且将CO转换成CO2，保证生产工艺的安全，还为炼铁生产提供原料。S2. Transport the flue gas discharged from the No. 1 waste heat boiler to the carbon dioxide generator. Iron ore is installed in the carbon dioxide generator. The flue gas discharged from the No. The main component of the gas is CO 2 , and the carbon dioxide generator discharges the flue gas whose main component is CO 2 . The iron ore is arranged in layers, and a multi-stage reaction zone is set up in the carbon dioxide generator. The main component of the iron ore is Fe 2 O 3 . When the ambient temperature is around 800°C, Fe 2 O 3 can be combined with No. 1 waste heat boiler The CO in the exhaust flue gas undergoes a redox reaction spontaneously without external heat supply. Iron ore is reduced to Fe 3 O 4 and FeO, and CO is oxidized to CO 2 . Therefore, the main component of the flue gas emitted by the carbon dioxide generator is for CO 2 . After thermodynamic analysis, it is shown that the reaction between iron ore and CO is an exothermic reaction, so the temperature of the flue gas in the carbon dioxide generator has not changed, and the temperature of the flue gas discharged from the carbon dioxide generator is still 900 ℃ ~ 1000 ℃. Therefore, in the carbon dioxide generator, the flue gas heat is not lost, and CO is converted into CO 2 , which ensures the safety of the production process and provides raw materials for ironmaking.
S3、将二氧化碳发生装置排出的主要成份为CO2的烟气输送到贰号余热锅炉，烟气在贰号余热锅炉内与水进行换热后，贰号余热锅炉内的部分水转换成水蒸气，烟气温度下降到250℃～350℃，贰号余热锅炉将烟气排出。贰号余热锅炉产生的水蒸气经蒸汽稳压罐稳压后用于发电设备进行发电，蒸汽稳压罐是为了确保水蒸汽能够持续稳定供应给发电设备。S3. Transport the flue gas mainly composed of CO 2 discharged from the carbon dioxide generator to the No. 2 waste heat boiler. After the flue gas exchanges heat with water in the No. 2 waste heat boiler, part of the water in the No. 2 waste heat boiler is converted into water vapor , the temperature of the flue gas drops to 250°C to 350°C, and the No. 2 waste heat boiler discharges the flue gas. The water vapor generated by the No. 2 waste heat boiler is stabilized by the steam surge tank and then used for power generation equipment to generate electricity. The steam surge tank is to ensure that the water vapor can be continuously and stably supplied to the power generation equipment.
S4、将贰号余热锅炉排出的烟气输送到换热装置，烟气在换热装置内与水进行换热后，换热装置中水的温度升高且部分水转化成水蒸气，烟气的温度下降到50℃～70℃，换热装置将烟气排出。因为从贰号余热锅炉内排出的烟气余温仍然较高，温度为250℃～350℃，如果直接排入空气会造成大量排烟热损失，所以本发明将从贰号余热锅炉内排出的烟气输送入换热装置，通过换热装置将烟气余热降低到50℃～70℃。经过换热装置加热的热水和产生的水蒸气用于民用余热开发，例如用于工业生产和温泉旅游开发，确保在不浪费资源的情况下，充分利用烟气余热，使排烟热损失降至最低，同时充分挖掘烟气的经济效益。而且由于烟气中几乎没有水分，所以可忽略烟气对换热装置的低温腐蚀。S4. Transport the flue gas discharged from the No. 2 waste heat boiler to the heat exchange device. After the flue gas exchanges heat with water in the heat exchange device, the temperature of the water in the heat exchange device rises and part of the water is converted into water vapor. The flue gas The temperature drops to 50℃～70℃, and the heat exchange device discharges the flue gas. Because the residual temperature of the flue gas discharged from the No. 2 waste heat boiler is still high, the temperature is 250 ° C ~ 350 ° C, if it is directly discharged into the air, it will cause a large amount of exhaust heat loss, so the present invention will discharge from the No. 2 waste heat boiler The flue gas is transported into the heat exchange device, and the waste heat of the flue gas is reduced to 50°C to 70°C through the heat exchange device. The hot water heated by the heat exchange device and the water vapor produced are used for civil waste heat development, such as industrial production and hot spring tourism development, to ensure that the waste heat of the flue gas is fully utilized without wasting resources, and the heat loss of the exhaust gas is reduced. To the minimum, while fully exploiting the economic benefits of flue gas. And because there is almost no moisture in the flue gas, the low-temperature corrosion of the heat exchange device by the flue gas can be ignored.
S5、将换热装置排出的烟气经静电除尘装置进行除尘后输送入二氧化碳提纯冷却回收装置，收集CO2气体。经过换热装置换热后的烟气的温度下降至50℃～70℃，且主要成份为CO2气体，而CO2为工业原料，具有商业价值，所以本发明中利用静电除尘装置对从换热装置中排出的烟气进行除尘，再通过提纯和低温富集的方法得到较为纯净的CO2，这种方法能够用于替代炼铁生产过程中高温煅烧石灰石生产二氧化碳的工艺，能够节省大量能源消耗并减少废弃物排放。S5. The flue gas discharged from the heat exchange device is dedusted by the electrostatic precipitator and then sent to the carbon dioxide purification cooling recovery device to collect CO 2 gas. The temperature of the flue gas after heat exchange by the heat exchange device drops to 50°C-70°C, and the main component is CO 2 gas, while CO 2 is an industrial raw material and has commercial value. The flue gas discharged from the thermal device is dedusted, and then relatively pure CO 2 is obtained through purification and low-temperature enrichment. This method can be used to replace the high-temperature calcination of limestone in the iron-making process to produce carbon dioxide, which can save a lot of energy. Consume and reduce waste emissions.
综上所述，本发明具有以下有益效果：In summary, the present invention has the following beneficial effects:
(1)本发明通过CO与铁矿石的氧化还原反应，不仅将烟气中的有毒CO转换成无毒的CO2，而且确保烟气热量未损失，保证生产工艺的安全，还为炼铁生产提供原料。(1) Through the oxidation-reduction reaction of CO and iron ore, the present invention not only converts the toxic CO in the flue gas into non-toxic CO 2 , but also ensures that the heat of the flue gas is not lost, ensuring the safety of the production process, and is also an important tool for ironmaking Production provides raw materials.
(2)烟气与壹号余热锅炉内的水和贰号余热锅炉内的水进行换热产生的水蒸气用于发电，烟气与换热装置内的水进行换热产生的热水和水蒸气用于民用余热开发，最大化的降低烟气的余热损失，发掘烟气的经济利益，烟气热效率提高到85％。(2) The steam generated by the heat exchange between the flue gas and the water in the No. 1 waste heat boiler and the water in the No. 2 waste heat boiler is used for power generation, and the hot water and water produced by the heat exchange between the flue gas and the water in the heat exchange device The steam is used for civil waste heat development, which minimizes the waste heat loss of the flue gas, explores the economic benefits of the flue gas, and increases the thermal efficiency of the flue gas to 85%.
(3)本发明通过静电除尘设备对从换热装置内排出的烟气进行尾气收集，替代了炼铁生产中高温煅烧石灰石生产CO2的工艺，节省大量能源，同时实现转炉烟气的零排放。(3) The present invention collects the tail gas from the flue gas discharged from the heat exchange device through the electrostatic dust removal equipment, which replaces the high-temperature calcined limestone production process in ironmaking production, saves a lot of energy, and realizes zero emission of converter flue gas at the same time .
以上公开的仅为本发明的较佳实施例，但是，本发明实施例并非局限于此，任何本领域的技术人员能思之的变化都应落入本发明的保护范围。The above disclosures are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any changes conceivable by those skilled in the art shall fall within the protection scope of the present invention.
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| CN116538818A (en) * | 2023-05-18 | 2023-08-04 | 深圳凯盛科技工程有限公司 | Flue gas waste heat utilization system and flue gas waste heat utilization method |
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