CN103122398B - Smoke self-circulation preheating coal dust injection technology and device - Google Patents
Smoke self-circulation preheating coal dust injection technology and device Download PDFInfo
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- CN103122398B CN103122398B CN201310079532.4A CN201310079532A CN103122398B CN 103122398 B CN103122398 B CN 103122398B CN 201310079532 A CN201310079532 A CN 201310079532A CN 103122398 B CN103122398 B CN 103122398B
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- 238000005516 engineering process Methods 0.000 title claims description 5
- 239000002817 coal dust Substances 0.000 title claims 6
- 238000002347 injection Methods 0.000 title abstract description 84
- 239000007924 injection Substances 0.000 title abstract description 84
- 239000000779 smoke Substances 0.000 title 1
- 239000003245 coal Substances 0.000 claims abstract description 153
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000003546 flue gas Substances 0.000 claims abstract description 64
- 238000000034 method Methods 0.000 claims abstract description 50
- 239000002699 waste material Substances 0.000 claims abstract description 24
- 239000007789 gas Substances 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 230000006835 compression Effects 0.000 claims abstract description 3
- 238000007906 compression Methods 0.000 claims abstract description 3
- 238000007664 blowing Methods 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims 2
- 230000000087 stabilizing effect Effects 0.000 claims 2
- 238000010298 pulverizing process Methods 0.000 abstract description 39
- 230000008901 benefit Effects 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 21
- 239000002912 waste gas Substances 0.000 description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 12
- 229910052757 nitrogen Inorganic materials 0.000 description 10
- 239000000571 coke Substances 0.000 description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 description 6
- 239000001569 carbon dioxide Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 238000004939 coking Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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- Y02W30/54—
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- Manufacture Of Iron (AREA)
- Blast Furnaces (AREA)
Abstract
本发明公开了一种烟气自循环预热煤粉喷吹工艺，利用高炉喷煤制粉系统外排废烟气的余压，将高炉喷煤制粉系统外排废烟气经过滤器过滤后，依次引至换热器加热和压缩机压缩至煤粉输送工艺所需要的温度和压力，并作为煤粉输送的载体和煤粉预热的介质，在煤粉气力输送过程中，将煤粉预热、喷吹至高炉。该烟气自循环预热煤粉喷吹工艺能够利用高炉喷煤制粉系统外排废烟气作为煤粉喷吹的载体和煤粉预热的介质，能够提高煤粉的利用率，降低运营成本和实现高炉喷煤制粉系统外排废烟气的自循环和低温热能的回收利用，节能环保效果良好，具有显著的经济和社会效益。本发明还公开了一种烟气自循环预热煤粉喷吹装置。
The invention discloses a flue gas self-circulation preheating pulverized coal injection process, which utilizes the residual pressure of the exhausted exhaust gas from the blast furnace coal injection pulverization system to filter the exhaust exhaust gas from the blast furnace coal injection pulverization system through a filter , lead to heat exchanger heating and compressor compression to the temperature and pressure required by the pulverized coal transportation process, and serve as the carrier of pulverized coal transportation and the medium for preheating of pulverized coal. During the pulverized coal pneumatic transportation process, the pulverized coal Preheat and blow into blast furnace. The flue gas self-circulation preheating pulverized coal injection process can use the waste flue gas discharged from the blast furnace coal injection pulverization system as the carrier of pulverized coal injection and the medium of pulverized coal preheating, which can improve the utilization rate of pulverized coal and reduce operating costs. Cost and realize the self-circulation of the waste flue gas discharged from the blast furnace coal injection pulverization system and the recovery and utilization of low-temperature heat energy. The energy saving and environmental protection effect is good, and it has significant economic and social benefits. The invention also discloses a flue gas self-circulation preheating pulverized coal injection device.
Description
技术领域 technical field
本发明属于钢铁冶炼技术领域中高炉喷吹煤粉的配套工艺，具体涉及一种利用烟气自循环预热煤粉的煤粉喷吹工艺及装置。 The invention belongs to the supporting process of blast furnace pulverized coal injection in the technical field of iron and steel smelting, and in particular relates to a pulverized coal injection process and device for preheating pulverized coal by self-circulation of flue gas.
背景技术 Background technique
高炉喷煤是当今高炉炼铁工艺中必不可少的配套工艺，高炉以煤代焦，可以有效缓解焦煤资源短缺的局面和降低生铁成本，是改变高炉用能结构的关键技术，在节焦降耗方面起着重要的作用。 Blast furnace coal injection is an indispensable supporting process in today's blast furnace ironmaking process. Substituting coal for coke in blast furnaces can effectively alleviate the shortage of coking coal resources and reduce the cost of pig iron. It is a key technology to change the energy structure of blast furnaces. consumption plays an important role.
目前，高炉喷煤气力输送的工艺技术是采用压缩氮气、压缩空气或者二者的混合气体作为载体输送煤粉至高炉，该方法虽然能够满足高炉喷吹煤粉的要求，但是存在运营成本高的缺陷。 At present, the process technology of blast furnace coal injection pneumatic conveying is to use compressed nitrogen, compressed air or a mixture of the two as a carrier to transport pulverized coal to the blast furnace. Although this method can meet the requirements of blast furnace pulverized coal injection, it has the disadvantage of high operating costs. defect.
目前，也有一些利用废烟气作为载体输送煤粉的高炉喷吹煤粉工艺，如公开号为CN 101000141的中国专利公开了一种用热风炉烟道废气作载体的高炉喷煤方法，该高炉喷煤方法利用热风炉烟道废气作为载体向高炉喷吹煤粉，虽然在一定程度上取得了降低成本的效果，但是由于在实施过程中需要将热风炉烟道废气经过冷却后才能被引出利用，因此该高炉喷煤方法不具备煤粉预热的能力，导致煤粉利用率低。 At present, there are also some blast furnace pulverized coal injection processes that use waste flue gas as a carrier to transport pulverized coal. For example, the Chinese patent with the publication number CN 101000141 discloses a blast furnace coal injection method that uses hot blast stove flue gas as a carrier. The coal injection method uses the flue gas of the hot blast stove as a carrier to inject pulverized coal to the blast furnace. Although the effect of reducing costs has been achieved to a certain extent, the flue gas of the hot blast stove needs to be cooled before it can be drawn out for use during the implementation process. , so the blast furnace coal injection method does not have the ability to preheat pulverized coal, resulting in low utilization of pulverized coal.
还有一些利用废烟气作为热源预热煤粉提高煤粉利用率的高炉喷吹煤粉工艺，如公开号为CN102605119A的中国专利申请公开了一种高炉喷吹煤粉过程中的煤粉输送及预热工艺装置，该煤粉输送及预热工艺装置虽然对煤粉进行了预热，但是只是采用外来气源和预热装置对煤粉进行预热，为间接预热方式而不是直接采用将输送介质作为热源预热煤粉，没有循环利用制粉系统外排废烟气的低温热能和惰性特质。 There are also some blast furnace pulverized coal injection processes that use waste flue gas as a heat source to preheat pulverized coal to increase the utilization rate of pulverized coal. For example, the Chinese patent application whose publication number is CN102605119A discloses a kind of pulverized coal transportation in the pulverized coal injection process of blast furnace and preheating process device, although the pulverized coal conveying and preheating process device preheats the pulverized coal, it only uses an external gas source and a preheating device to preheat the pulverized coal, which is an indirect preheating method rather than directly using The conveying medium is used as a heat source to preheat pulverized coal, and there is no recycling of the low-temperature heat energy and inert characteristics of the waste flue gas discharged from the pulverizing system.
发明内容 Contents of the invention
有鉴于此，本发明的目的在于提供一种烟气自循环预热煤粉喷吹工艺及装置，该烟气自循环预热煤粉喷吹工艺及装置能够利用高炉喷煤制粉系统外排废烟气作为煤粉喷吹的载体和煤粉预热的介质，能够提高煤粉的利用率，降低运营成本和实现高炉喷煤制粉系统外排废烟气的自循环和低温热能的回收利用。 In view of this, the object of the present invention is to provide a flue gas self-circulation preheating pulverized coal injection process and device, the flue gas self-circulation preheating pulverized coal injection process and device can use the blast furnace coal injection pulverization system to discharge As the carrier of pulverized coal injection and the preheating medium of pulverized coal, waste flue gas can improve the utilization rate of pulverized coal, reduce operating costs and realize the self-circulation of waste flue gas discharged from the blast furnace coal injection pulverizing system and the recovery of low-temperature heat energy use.
为达到上述目的，本发明提供如下技术方案： To achieve the above object, the present invention provides the following technical solutions:
本发明首先提出了一种烟气自循环预热煤粉喷吹工艺，利用高炉喷煤制粉系统外排废烟气的余压，将高炉喷煤制粉系统外排废烟气经过滤器过滤后，依次引至换热器加热和压缩机压缩至煤粉输送工艺所需要的温度和压力，并作为煤粉输送的载体和煤粉预热的直接介质，在煤粉气力输送过程中，将煤粉预热、喷吹至高炉。 The present invention first proposes a flue gas self-circulation preheating pulverized coal injection process, which uses the residual pressure of the exhausted exhaust gas from the blast furnace coal injection pulverization system to filter the exhaust exhaust gas from the blast furnace coal injection pulverization system through a filter After that, it is led to the heat exchanger for heating and the compressor is compressed to the temperature and pressure required by the pulverized coal transportation process, and it is used as the carrier of pulverized coal transportation and the direct medium of pulverized coal preheating. During the pulverized coal pneumatic transportation process, the The pulverized coal is preheated and injected into the blast furnace.
进一步，所述换热器以热风炉的烟道废气作为热源。 Further, the heat exchanger uses the flue gas of the hot blast stove as a heat source.
进一步，在煤粉气力输送过程中，煤粉被直接预热至80~180℃。 Further, in the process of pulverized coal pneumatic conveying, the pulverized coal is directly preheated to 80~180°C.
进一步，所述高炉喷煤制粉系统外排废烟气经压缩机压缩后的压力为0.6~1.6MPa。 Furthermore, the pressure of the waste flue gas discharged from the blast furnace coal-injection pulverizing system after being compressed by the compressor is 0.6-1.6 MPa.
本发明还提出了一种适用于如上所述烟气自循环预热煤粉喷吹工艺的烟气自循环预热煤粉喷吹装置，包括一端与高炉喷煤制粉系统外排废气烟道相连并用于输送高炉喷煤制粉系统外排废烟气的循环管道，所述循环管道上沿着所述输送高炉喷煤制粉系统外排废烟气的流向依次设有用于控制废烟气流量的控制阀门、用于过滤废烟气杂质的过滤器、用于加热废烟气的换热器、用于压缩废烟气的压缩机和用于废烟气稳压存储的稳压储气罐，所述循环管道的另一端与设置在煤粉喷吹管路上的补气器相连。 The present invention also proposes a flue gas self-circulation preheating coal powder injection device suitable for the above-mentioned flue gas self-circulation preheating coal powder injection process, including one end connected to the exhaust gas flue of the blast furnace coal injection pulverization system Connected and used to transport the circulation pipe for exhausting waste gas from the blast furnace coal-injection pulverizing system. Flow control valve, filter for filtering waste gas impurities, heat exchanger for heating waste gas, compressor for compressing waste gas and regulated gas storage for stable pressure storage of waste gas tank, and the other end of the circulation pipeline is connected with the gas supply device arranged on the pulverized coal injection pipeline.
进一步，所述换热器与热风炉的烟道废气输送管道相连。 Further, the heat exchanger is connected with the flue gas conveying pipeline of the hot blast stove.
进一步，还包括与所述换热器并列设置的辅助旁道，所述辅助旁道上设有控制阀门。 Further, it also includes an auxiliary bypass arranged in parallel with the heat exchanger, and a control valve is arranged on the auxiliary bypass.
本发明的有益效果在于： The beneficial effects of the present invention are:
本发明的烟气自循环预热煤粉喷吹工艺，利用高炉喷煤制粉系统外排废烟气作为煤粉预热的介质和喷吹的载体，与现有技术相比，具有以下优点： The flue gas self-circulation preheating pulverized coal injection process of the present invention uses the waste flue gas discharged from the blast furnace coal injection pulverization system as the medium for coal preheating and the carrier of injection, and has the following advantages compared with the prior art :
1）采用低含氧量的高炉喷煤制粉系统外排废烟气代替传统的全氮气输送介质或氮气加少量压缩空气的输送介质，不仅具备全氮气输送和氮气加压缩空气输送煤粉的安全性，而且高炉喷煤制粉系统外排废烟气进入高炉中，实现高炉喷吹煤粉工艺烟气自循环，从而节约氮气和压缩空气等能源介质，将降低系统运行成本，具有显著的经济和社会效益； 1) Adopt low-oxygen blast furnace coal-injection pulverization system exhaust waste gas to replace the traditional full nitrogen conveying medium or nitrogen plus a small amount of compressed air conveying medium, not only has full nitrogen conveying and nitrogen plus compressed air conveying pulverized coal Safety, and the waste flue gas discharged from the blast furnace coal injection pulverization system enters the blast furnace to realize the self-circulation of the flue gas in the blast furnace pulverized coal injection process, thereby saving energy media such as nitrogen and compressed air, which will reduce system operating costs and have significant advantages economic and social benefits;
2）用高二氧化碳含量的高炉喷煤制粉系统外排废烟气输送煤粉送至高炉中，不仅可以显著减少二氧化碳的排放，而且可以提高高炉内煤粉与二氧化碳的反应性、有效降低焦炭的溶损反应，起到保护焦炭料柱骨架的作用，间接节约宝贵的炼焦煤资源，具有节能环保的双重效果； 2) Using the blast furnace coal injection pulverization system with high carbon dioxide content to transport the pulverized coal to the blast furnace can not only significantly reduce the emission of carbon dioxide, but also improve the reactivity of pulverized coal and carbon dioxide in the blast furnace and effectively reduce coke The dissolution reaction can protect the skeleton of the coke material column, indirectly save valuable coking coal resources, and has the dual effects of energy saving and environmental protection;
3）采用低温的高炉喷煤制粉系统外排废烟气经加热、压缩后，在煤粉气力输送过程中直接预热煤粉，有利于提高煤粉在输送管道内的流动性、减轻喷吹煤粉对热风的冷却效应、加速煤粉的燃烧过程从而提高煤粉利用率，达到降低焦比和燃料比的目的，因此具有节约燃料的效果； 3) After heating and compressing the waste gas exhausted from the low-temperature blast furnace coal injection pulverization system, the pulverized coal is directly preheated in the process of pneumatic conveying of the pulverized coal, which is beneficial to improve the fluidity of the pulverized coal in the conveying pipeline and reduce the pressure of the pulverized coal. The cooling effect of pulverized coal blowing on the hot air accelerates the combustion process of pulverized coal so as to improve the utilization rate of pulverized coal and achieve the purpose of reducing the coke ratio and fuel ratio, so it has the effect of saving fuel;
4）所用高炉喷煤制粉系统外排废烟气易获取，尤其适合目前主流的高炉喷煤直接喷吹工艺，因为高炉喷煤制粉系统和高炉煤粉喷吹系统的设施合建在一个厂房内，可以直接用管道将高炉喷煤制粉系统外排废气引至加热器和压缩机入口，具有流程短、结构紧凑的优点，克服了现有技术因引用外来气源（距离较远）而增加能耗和投资的缺点。 4) The waste gas exhausted from the blast furnace coal injection pulverization system is easy to obtain, especially suitable for the current mainstream blast furnace coal injection direct injection process, because the facilities of the blast furnace coal injection pulverization system and the blast furnace pulverized coal injection system are built together In the factory building, the exhaust gas from the blast furnace coal injection pulverization system can be directly led to the inlet of the heater and compressor through pipelines, which has the advantages of short process and compact structure, and overcomes the existing technology that uses external gas sources (long distance) And the disadvantages of increasing energy consumption and investment.
附图说明 Description of drawings
为了使本发明的目的、技术方案和有益效果更加清楚，本发明提供如下附图进行说明： In order to make the purpose, technical scheme and beneficial effect of the present invention clearer, the present invention provides the following drawings for illustration:
图1为本发明烟气自循环预热煤粉喷吹装置的实施例结构示意图。 Fig. 1 is a structural schematic diagram of an embodiment of the flue gas self-circulation preheating pulverized coal injection device of the present invention.
具体实施方式 Detailed ways
下面将结合附图，对本发明的优选实施例进行详细的描述。 The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
如图1所示，为本发明烟气自循环预热煤粉喷吹装置的实施例结构示意图。本实施例的烟气自循环预热煤粉喷吹装置，包括一端与高炉喷煤制粉系统外排废气烟道1相连并用于输送高炉喷煤制粉系统外排废烟气的循环管道11，循环管道11上沿着输送高炉喷煤制粉系统外排废烟气的流向依次设有用于控制废烟气流量的控制阀门2、用于过滤废烟气杂质的过滤器3、用于加热废烟气的换热器4、用于压缩废烟气的压缩机5和用于废烟气稳压存储的稳压储气罐6，循环管道11的另一端与设置在煤粉喷吹管路12上的补气器8相连，煤粉喷吹管路12设置在喷吹罐7和高炉10之间，且在高炉10前还设有用于煤粉分配的分配器9。优选的，本实施例的换热器4与热风炉的烟道废气输送管道相连，即换热器4以热风炉的烟道废气作为热源加热高炉喷煤制粉系统外排废烟气，能够节约能耗，降低运营成本。优选的，本实施例的烟气自循环预热煤粉喷吹装置还包括与换热器4并列设置的辅助旁道13，辅助旁道13上设有控制阀门14，通过设置辅助旁道13，当煤粉不需要预热或换热器4出现故障时，高炉喷煤制粉系统外排废烟气可以通过辅助旁道13输送至压缩机5，并作为煤粉喷吹的载体。 As shown in Fig. 1 , it is a structural schematic diagram of an embodiment of the flue gas self-circulation preheating pulverized coal injection device of the present invention. The flue gas self-circulation preheating pulverized coal injection device in this embodiment includes a circulation pipe 11 connected at one end to the exhaust gas flue 1 of the blast furnace coal injection pulverization system and used to transport the exhaust gas exhausted from the blast furnace coal injection pulverization system , the circulating pipe 11 is provided with a control valve 2 for controlling the flow of the waste gas, a filter 3 for filtering impurities in the waste gas, and a filter 3 for heating Heat exchanger 4 for waste flue gas, compressor 5 for compressing waste flue gas, and pressure-stabilized gas storage tank 6 for stable pressure storage of waste flue gas. 12 is connected to the gas replenisher 8, and the pulverized coal injection pipeline 12 is arranged between the injection tank 7 and the blast furnace 10, and a distributor 9 for distribution of pulverized coal is also provided in front of the blast furnace 10. Preferably, the heat exchanger 4 of this embodiment is connected to the flue gas conveying pipeline of the hot blast stove, that is, the heat exchanger 4 uses the flue gas of the hot blast stove as a heat source to heat the exhaust gas exhausted from the coal-injection pulverizing system of the blast furnace, which can Save energy consumption and reduce operating costs. Preferably, the flue gas self-circulation preheating pulverized coal injection device of this embodiment also includes an auxiliary bypass 13 arranged in parallel with the heat exchanger 4, and a control valve 14 is provided on the auxiliary bypass 13. By setting the auxiliary bypass 13 , when the pulverized coal does not need to be preheated or the heat exchanger 4 fails, the exhaust gas from the blast furnace coal injection pulverization system can be transported to the compressor 5 through the auxiliary bypass 13 and used as a carrier for pulverized coal injection.
下面结合上述烟气自循环预热煤粉喷吹装置对本发明烟气自循环预热煤粉喷吹工艺的具体实施方式作详细说明。 The specific implementation of the flue gas self-circulation preheating coal powder injection process of the present invention will be described in detail below in combination with the above-mentioned flue gas self-circulation preheating coal powder injection device.
本实施例的烟气自循环预热煤粉喷吹工艺，利用高炉喷煤制粉系统外排废烟气的余压，将高炉喷煤制粉系统外排废烟气经过滤器过滤后，依次引至换热器4加热和压缩机5压缩至煤粉输送工艺所需要的温度和压力，并作为煤粉输送的载体和煤粉预热的直接介质，在煤粉气力输送过程中，将煤粉预热、喷吹至高炉10。本实施例高炉喷煤制粉系统外排废烟气在进入换热器4加热前，通过过滤器3来去除杂质，并通过设置在过滤器3与高炉喷煤制粉系统外排废气烟道1之间的控制阀门2控制流量。 The flue gas self-circulation preheating pulverized coal injection process in this embodiment uses the residual pressure of the waste gas exhausted from the blast furnace coal injection pulverization system to filter the exhaust gas exhausted from the blast furnace coal pulverization system through a filter, and then sequentially Lead to the heat exchanger 4 for heating and compressor 5 to compress to the temperature and pressure required by the pulverized coal transportation process, and serve as the carrier of pulverized coal transportation and the direct medium for preheating of pulverized coal. During the pneumatic transportation of pulverized coal, the coal The powder is preheated and injected into the blast furnace 10. In this embodiment, the waste flue gas exhausted from the blast furnace coal injection pulverization system passes through the filter 3 to remove impurities before entering the heat exchanger 4 for heating, and passes through the exhaust gas flue arranged between the filter 3 and the blast furnace coal injection pulverization system. A control valve between 1 and 2 controls the flow.
优选的，换热器4以热风炉的烟道废气作为热源，能够节约能耗，降低运营成本。 Preferably, the heat exchanger 4 uses the flue gas of the hot blast stove as a heat source, which can save energy consumption and reduce operating costs.
优选的，在煤粉气力输送过程中，煤粉被直接预热至80~180℃，有利于提高煤粉在输送管道内的流动性、减轻喷吹煤粉对热风的冷却效应、加速煤粉的燃烧过程从而提高煤粉利用率。优选的，高炉喷煤制粉系统外排废烟气经压缩机5压缩后的压力为0.6~1.6MPa，能够满足高炉煤粉喷吹的压力需求。煤粉的余热温度和高炉喷煤制粉系统外排废烟气的压缩压力根据实际工艺需求在上述参数范围内设定。 Preferably, during the pulverized coal pneumatic conveying process, the pulverized coal is directly preheated to 80~180°C, which is conducive to improving the fluidity of the pulverized coal in the conveying pipeline, reducing the cooling effect of the pulverized coal injection on the hot air, and accelerating the pulverized coal The combustion process improves the utilization rate of pulverized coal. Preferably, the pressure of the waste flue gas discharged from the blast furnace coal injection pulverization system after being compressed by the compressor 5 is 0.6-1.6 MPa, which can meet the pressure requirement of the blast furnace pulverized coal injection. The waste heat temperature of pulverized coal and the compression pressure of the waste flue gas discharged from the blast furnace coal injection pulverization system are set within the above parameter ranges according to the actual process requirements.
本实施例的烟气自循环预热煤粉喷吹工艺，利用高炉喷煤制粉系统外排废烟气作为煤粉预热的介质和喷吹的载体，与现有技术相比，具有以下优点： The flue gas self-circulation preheating pulverized coal injection process of this embodiment uses the waste flue gas discharged from the blast furnace coal injection pulverization system as the medium for coal preheating and the carrier for injection. Compared with the prior art, it has the following advantages advantage:
1）采用低含氧量的高炉喷煤制粉系统外排废烟气代替传统的全氮气输送介质或氮气加少量压缩空气的输送介质，不仅具备全氮气输送和氮气加压缩空气输送煤粉的安全性，而且高炉喷煤制粉系统外排废烟气进入高炉10中，实现高炉10喷吹煤粉工艺烟气自循环，从而节约氮气和压缩空气等能源介质，将降低系统运行成本，具有显著的经济和社会效益； 1) Adopt low-oxygen blast furnace coal-injection pulverization system exhaust waste gas to replace the traditional full nitrogen conveying medium or nitrogen plus a small amount of compressed air conveying medium, not only has full nitrogen conveying and nitrogen plus compressed air conveying pulverized coal safety, and the waste flue gas discharged from the blast furnace coal injection pulverization system enters the blast furnace 10 to realize the self-circulation of the flue gas in the blast furnace 10 pulverized coal injection process, thereby saving energy media such as nitrogen and compressed air, and will reduce system operating costs. Significant economic and social benefits;
2）用高二氧化碳含量的高炉喷煤制粉系统外排废烟气输送煤粉送至高炉10中，不仅可以显著减少二氧化碳的排放，而且可以提高高炉内煤粉与二氧化碳的反应性、有效降低焦炭的溶损反应，起到保护焦炭料柱骨架的作用，间接节约宝贵的炼焦煤资源，具有节能环保的双重效果； 2) Using the blast furnace coal injection pulverization system with high carbon dioxide content to transport the pulverized coal to the blast furnace 10 can not only significantly reduce the emission of carbon dioxide, but also improve the reactivity of pulverized coal and carbon dioxide in the blast furnace, effectively reducing the The dissolution reaction of coke plays the role of protecting the skeleton of the coke material column, indirectly saving valuable coking coal resources, and has the dual effects of energy saving and environmental protection;
3）采用低温的高炉喷煤制粉系统外排废烟气经加热、压缩后，在煤粉气力输送过程中直接预热煤粉，有利于提高煤粉在输送管道内的流动性、减轻喷吹煤粉对热风的冷却效应、加速煤粉的燃烧过程从而提高煤粉利用率，达到降低焦比和燃料比的目的，因此具有节约燃料的效果； 3) After heating and compressing the waste gas exhausted from the low-temperature blast furnace coal injection pulverization system, the pulverized coal is directly preheated in the process of pneumatic conveying of the pulverized coal, which is beneficial to improve the fluidity of the pulverized coal in the conveying pipeline and reduce the pressure of the pulverized coal. The cooling effect of pulverized coal blowing on the hot air accelerates the combustion process of pulverized coal so as to improve the utilization rate of pulverized coal and achieve the purpose of reducing the coke ratio and fuel ratio, so it has the effect of saving fuel;
4）所用高炉喷煤制粉系统外排废烟气易获取，尤其适合目前主流的高炉喷煤直接喷吹工艺，因为高炉喷煤制粉系统和高炉煤粉喷吹系统的设施合建在一个厂房内，可以利用高炉喷煤制粉系统外排废烟气的余压，将高炉喷煤制粉系统外排废烟气引至加热器和压缩机入口，具有流程短、结构紧凑的优点，克服了现有技术因引用外来气源（距离较远）而增加能耗和投资的缺点。 4) The waste gas exhausted from the blast furnace coal injection pulverization system is easy to obtain, especially suitable for the current mainstream blast furnace coal injection direct injection process, because the facilities of the blast furnace coal injection pulverization system and the blast furnace pulverized coal injection system are built together In the factory building, the residual pressure of the exhaust gas from the blast furnace coal injection pulverization system can be used to lead the exhaust gas from the blast furnace coal injection pulverization system to the inlet of the heater and compressor, which has the advantages of short process and compact structure. It overcomes the shortcomings of increasing energy consumption and investment due to the introduction of external gas sources (long distance) in the prior art.
最后说明的是，以上优选实施例仅用以说明本发明的技术方案而非限制，尽管通过上述优选实施例已经对本发明进行了详细的描述，但本领域技术人员应当理解，可以在形式上和细节上对其作出各种各样的改变，而不偏离本发明权利要求书所限定的范围。 Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that it can be described in terms of form and Various changes may be made in the details without departing from the scope of the invention defined by the claims.
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