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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Abstract
The invention discloses a smoke self-circulation preheating coal dust injection technology. Based on the excess pressure of the waste smoke exhausted by a blast furnace coal injection pulverizing system, the waste smoke exhausted by the blast furnace coal injection pulverizing system is filtered by a filter and sequentially guided to a heat exchanger for heating and to a compressor for compression to obtain the temperature and pressure required by a coal dust conveying technology; and as a coal dust conveying carrier and a coal dust preheating medium, the smoke preheats the coal dust and injects the coal dust to a blast furnace in a coal dust pneumatic conveying process. The smoke self-circulation preheating coal dust injection technology can adopt the waste smoke exhausted by the blast furnace coal injection pulverizing system as a coal dust injection carrier and a coal dust preheating medium, can improve the utilization rate of coal dust and reduce the operation cost and realize self-circulation of the waste smoke exhausted by the blast furnace coal injection pulverizing system as well as the recycling of low-temperature heat energy, realizes a good energy saving and environmental protection effect, and has obvious economic and social benefits. The invention also discloses a smoke self-circulation preheating coal dust injection device.
Description
Technical field
The invention belongs to the process matched therewith of pulverized coal injection in blast furnace in smelting iron and steel technical field, be specifically related to a kind of the breeze blowing technique and the device that utilize flue gas self-circulation preheating coal dust.
Background technology
Pulverized coal injection is requisite process matched therewith in current blast furnace iron-making process, blast furnace briquet replacing coke, effectively can alleviating the situation of coking coal resource shortage and reduce pig iron cost, is the gordian technique changing blast furnace energy structure, plays an important role in the burnt consumption reduction of joint.
At present, the air conveying Technology of pulverized coal injection adopts compressed nitrogen, pressurized air or the mixed gas of the two as carrier pulverized coal conveying to blast furnace, although the method can meet the requirement of pulverized coal injection in blast furnace, there is the defect that operation cost is high.
At present, also some are had to utilize useless flue gas as the pulverized coal injection into blast furna powder craft of carrier pulverized coal conveying, as the publication number Chinese patent that is CN 101000141 discloses a kind of blast-furnace coal powder injection method of waste gas of hot-blast stove flue as carrier, this blast-furnace coal powder injection method utilizes waste gas of hot-blast stove flue as carrier is to pulverized coal injection in blast furnace, although achieve the effect reduced costs to a certain extent, but owing to needing could to be utilized by extraction after overcooling by waste gas of hot-blast stove flue in implementation process, therefore this blast-furnace coal powder injection method does not possess the ability of pulverized coal preheating, cause coal utilization low.
Some are also had to utilize useless flue gas to improve the pulverized coal injection into blast furna powder craft of coal utilization as thermal source preheating coal dust, as the publication number Chinese patent application that is CN102605119A discloses coal dust conveying in a kind of pulverized coal injection in blast furnace process and pre-heating technique device, although the conveying of this coal dust and pre-heating technique device have carried out preheating to coal dust, but just adopt external source of the gas and primary heater unit to carry out preheating to coal dust, for indirect preheating mode instead of directly adopt using delivery medium as thermal source preheating coal dust, there is no low temperature heat energy and the inertia speciality of the outer waste discharge flue gas of recycle pulverized coal preparation system.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of flue gas self-circulation preheating breeze blowing technique and device, this flue gas self-circulation preheating breeze blowing technique and device can utilize the outer carrier of waste discharge flue gas as breeze blowing of Coal Grinding System of Pci and the medium of pulverized coal preheating, the utilization ratio of coal dust can be improved, cut operating costs and realize the outer self-circulation of waste discharge flue gas of Coal Grinding System of Pci and the recycling of low temperature heat energy.
For achieving the above object, the invention provides following technical scheme:
The present invention first proposed a kind of flue gas self-circulation preheating breeze blowing technique, utilize the overbottom pressure of the outer waste discharge flue gas of Coal Grinding System of Pci, after outer for Coal Grinding System of Pci waste discharge flue gas is filtered, cause interchanger heating and the temperature and pressure required for compressor compresses to coal dust delivery technology successively, and as the carrier of coal dust conveying and the direct medium of pulverized coal preheating, in coal dust process of pneumatic transmission, by pulverized coal preheating, jet to blast furnace.
Further, described interchanger is using the stack gases of hotblast stove as thermal source.
Further, in coal dust process of pneumatic transmission, coal dust is directly warmed-up to 80 ~ 180 DEG C.
Further, the pressure of the outer waste discharge flue gas of described Coal Grinding System of Pci after compressor compression is 0.6 ~ 1.6MPa.
The invention allows for a kind of flue gas self-circulation preheating coal powder blowing device being applicable to flue gas self-circulation preheating breeze blowing technique described above, comprise the outer waste air flue of one end and Coal Grinding System of Pci to be connected and for carrying the circulating line of the outer waste discharge flue gas of Coal Grinding System of Pci, described circulating line is provided with the by-pass valve control for controlling useless flue gas flow successively along the flow direction of the outer waste discharge flue gas of described conveying Coal Grinding System of Pci, for filtering the strainer of useless flue gas impurity, for heating the interchanger of useless flue gas, for compressing the compressor of useless flue gas and the voltage stabilizing gas-holder for useless flue gas voltage stabilizing storage, the other end of described circulating line is connected with the air compensation device be arranged on breeze blowing pipeline.
Further, described interchanger is connected with the stack gases transport pipe of hotblast stove.
Further, also comprise the auxiliary lie be set up in parallel with described interchanger, described auxiliary lie is provided with by-pass valve control.
Beneficial effect of the present invention is:
Flue gas self-circulation preheating breeze blowing technique of the present invention, utilizes the outer medium of waste discharge flue gas as pulverized coal preheating of Coal Grinding System of Pci and the carrier of winding-up, compared with prior art, has the following advantages:
1) the outer waste discharge flue gas of the Coal Grinding System of Pci of low oxygen content is adopted to replace traditional full nitrogen delivery medium or nitrogen to add a small amount of compressed-air actuated delivery medium, not only possesses the security of the conveying of full nitrogen and nitrogen pressurization contracting air pulverized coal conveying, and the outer waste discharge flue gas of Coal Grinding System of Pci enters in blast furnace, realize the self-circulation of pulverized coal injection into blast furna powder craft flue gas, thus save nitrogen and pressurized air equal energy source medium, to system operation cost be reduced, there is significant economic and social benefit;
2) deliver in blast furnace with the outer waste discharge flue gas pulverized coal conveying of the Coal Grinding System of Pci of high carbon dioxide content, not only significantly can reduce the discharge of carbonic acid gas, and the reactivity of coal dust and carbonic acid gas in blast furnace, effective thrombolytic agents reducing coke can be improved, play the effect of protection coke stock column skeleton, the coking coal resource of indirect saving preciousness, has the double effects of energy-conserving and environment-protective;
3) adopt the outer waste discharge flue gas of the Coal Grinding System of Pci of low temperature after heating, compression, direct preheating coal dust in coal dust process of pneumatic transmission, be conducive to improving the mobility of coal dust in transport pipe, alleviate coal injection to the cooling effect of hot blast, the combustion processes accelerating coal dust thus improve coal utilization, reach the object reducing coke ratio and fuel ratio, therefore there is fuel-saving effect;
4) the outer waste discharge flue gas of Coal Grinding System of Pci used easily obtains, especially the direct blowing process of pulverized coal injection of current main flow is applicable to, because the facility of Coal Grinding System of Pci and Pulverized Coal Injection System with Fuzzy is built jointly in a factory building, direct pipeline outer for Coal Grinding System of Pci waste air can be caused well heater and suction port of compressor, having that flow process is short, the advantage of compact construction, overcoming prior art increases energy consumption and investment shortcoming because quoting external source of the gas (distant).
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearly, the invention provides following accompanying drawing and being described:
Fig. 1 is the example structure schematic diagram of flue gas self-circulation preheating coal powder blowing device of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
As shown in Figure 1, be the example structure schematic diagram of flue gas self-circulation preheating coal powder blowing device of the present invention.The flue gas self-circulation preheating coal powder blowing device of the present embodiment, comprise the outer waste air flue 1 of one end and Coal Grinding System of Pci to be connected and for carrying the circulating line 11 of Coal Grinding System of Pci waste discharge flue gas outward, circulating line 11 is provided with the by-pass valve control 2 for controlling useless flue gas flow successively along the flow direction of the outer waste discharge flue gas of conveying Coal Grinding System of Pci, for filtering the strainer 3 of useless flue gas impurity, for heating the interchanger 4 of useless flue gas, for compressing the compressor 5 of useless flue gas and the voltage stabilizing gas-holder 6 for useless flue gas voltage stabilizing storage, the other end of circulating line 11 is connected with the air compensation device 8 be arranged on breeze blowing pipeline 12, breeze blowing pipeline 12 is arranged between winding-up tank 7 and blast furnace 10, and the divider 9 be also provided with before blast furnace 10 for coal powder distribation.Preferably, the interchanger 4 of the present embodiment is connected with the stack gases transport pipe of hotblast stove, namely interchanger 4 using the stack gases of hotblast stove as heat source Coal Grinding System of Pci outer waste discharge flue gas, can energy efficient, cut operating costs.Preferably, the flue gas self-circulation preheating coal powder blowing device of the present embodiment also comprises the auxiliary lie 13 be set up in parallel with interchanger 4, auxiliary lie 13 is provided with by-pass valve control 14, by arranging auxiliary lie 13, when coal dust does not need preheating or interchanger 4 breaks down, the outer waste discharge flue gas of Coal Grinding System of Pci can be delivered to compressor 5 by auxiliary lie 13, and as the carrier of breeze blowing.
Elaborate below in conjunction with the embodiment of above-mentioned flue gas self-circulation preheating coal powder blowing device to flue gas self-circulation preheating breeze blowing technique of the present invention.
The flue gas self-circulation preheating breeze blowing technique of the present embodiment, utilize the overbottom pressure of the outer waste discharge flue gas of Coal Grinding System of Pci, after outer for Coal Grinding System of Pci waste discharge flue gas is filtered, cause interchanger 4 successively to heat and compressor 5 is compressed to temperature and pressure required for coal dust delivery technology, and as the carrier of coal dust conveying and the direct medium of pulverized coal preheating, in coal dust process of pneumatic transmission, by pulverized coal preheating, jet to blast furnace 10.The outer waste discharge flue gas of the present embodiment Coal Grinding System of Pci, before entering interchanger 4 and heating, removes impurity by strainer 3, and controls flow by the by-pass valve control 2 be arranged between strainer 3 and the outer waste air flue 1 of Coal Grinding System of Pci.
Preferably, interchanger 4, can energy efficient using the stack gases of hotblast stove as thermal source, cuts operating costs.
Preferably, in coal dust process of pneumatic transmission, coal dust is directly warmed-up to 80 ~ 180 DEG C, is conducive to improving the mobility of coal dust in transport pipe, alleviates coal injection to the cooling effect of hot blast, the combustion processes accelerating coal dust thus improve coal utilization.Preferably, the pressure of the outer waste discharge flue gas of Coal Grinding System of Pci after compressor 5 compresses is 0.6 ~ 1.6MPa, can meet the pressure demand of blast-furnace coal powder injection.The compression pressure of the waste heat supply temperature of coal dust and the outer waste discharge flue gas of Coal Grinding System of Pci sets within the scope of above-mentioned parameter according to actual process demand.
The flue gas self-circulation preheating breeze blowing technique of the present embodiment, utilizes the outer medium of waste discharge flue gas as pulverized coal preheating of Coal Grinding System of Pci and the carrier of winding-up, compared with prior art, has the following advantages:
1) the outer waste discharge flue gas of the Coal Grinding System of Pci of low oxygen content is adopted to replace traditional full nitrogen delivery medium or nitrogen to add a small amount of compressed-air actuated delivery medium, not only possesses the security of the conveying of full nitrogen and nitrogen pressurization contracting air pulverized coal conveying, and the outer waste discharge flue gas of Coal Grinding System of Pci enters in blast furnace 10, realize the self-circulation of blast furnace 10 coal-injection process flue gas, thus save nitrogen and pressurized air equal energy source medium, to system operation cost be reduced, there is significant economic and social benefit;
2) deliver in blast furnace 10 with the outer waste discharge flue gas pulverized coal conveying of the Coal Grinding System of Pci of high carbon dioxide content, not only significantly can reduce the discharge of carbonic acid gas, and the reactivity of coal dust and carbonic acid gas in blast furnace, effective thrombolytic agents reducing coke can be improved, play the effect of protection coke stock column skeleton, the coking coal resource of indirect saving preciousness, has the double effects of energy-conserving and environment-protective;
3) adopt the outer waste discharge flue gas of the Coal Grinding System of Pci of low temperature after heating, compression, direct preheating coal dust in coal dust process of pneumatic transmission, be conducive to improving the mobility of coal dust in transport pipe, alleviate coal injection to the cooling effect of hot blast, the combustion processes accelerating coal dust thus improve coal utilization, reach the object reducing coke ratio and fuel ratio, therefore there is fuel-saving effect;
4) the outer waste discharge flue gas of Coal Grinding System of Pci used easily obtains, especially the direct blowing process of pulverized coal injection of current main flow is applicable to, because the facility of Coal Grinding System of Pci and Pulverized Coal Injection System with Fuzzy is built jointly in a factory building, the overbottom pressure of the outer waste discharge flue gas of Coal Grinding System of Pci can be utilized, outer for Coal Grinding System of Pci waste discharge flue gas is caused well heater and suction port of compressor, having that flow process is short, the advantage of compact construction, overcoming prior art increases energy consumption and investment shortcoming because quoting external source of the gas (distant).
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (7)
1. a flue gas self-circulation preheating breeze blowing technique, it is characterized in that: the overbottom pressure utilizing the outer waste discharge flue gas of Coal Grinding System of Pci, after outer for Coal Grinding System of Pci waste discharge flue gas is filtered, cause interchanger heating and the temperature and pressure required for compressor compresses to coal dust delivery technology successively, and as the carrier of coal dust conveying and the direct medium of pulverized coal preheating, in coal dust process of pneumatic transmission, by pulverized coal preheating, jet to blast furnace.
2. flue gas self-circulation preheating breeze blowing technique according to claim 1, is characterized in that: described interchanger is using the stack gases of hotblast stove as thermal source.
3. flue gas self-circulation preheating breeze blowing technique according to claim 1, it is characterized in that: in coal dust process of pneumatic transmission, coal dust is directly warmed-up to 80 ~ 180 DEG C.
4. the flue gas self-circulation preheating breeze blowing technique according to any one of claim 1-3, is characterized in that: the pressure of the outer waste discharge flue gas of described Coal Grinding System of Pci after compressor compression is 0.6 ~ 1.6MPa.
5. one kind is applicable to the flue gas self-circulation preheating coal powder blowing device of flue gas self-circulation preheating breeze blowing technique as described in any one of claim 1-4, it is characterized in that: comprise the outer waste air flue of one end and Coal Grinding System of Pci and to be connected and for carrying the circulating line of the outer waste discharge flue gas of Coal Grinding System of Pci, described circulating line is provided with the by-pass valve control for controlling useless flue gas flow successively along the flow direction of the outer waste discharge flue gas of described conveying Coal Grinding System of Pci, for filtering the strainer of useless flue gas impurity, for heating the interchanger of useless flue gas, for compressing the compressor of useless flue gas and the voltage stabilizing gas-holder for useless flue gas voltage stabilizing storage, the other end of described circulating line is connected with the air compensation device be arranged on breeze blowing pipeline.
6. flue gas self-circulation preheating coal powder blowing device according to claim 5, is characterized in that: described interchanger is connected with the stack gases transport pipe of hotblast stove.
7. the flue gas self-circulation preheating coal powder blowing device according to claim 5 or 6, it is characterized in that: also comprise the auxiliary lie be set up in parallel with described interchanger, described auxiliary lie is provided with by-pass valve control.
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| CN103940213B (en) * | 2014-04-08 | 2016-08-31 | 中冶赛迪工程技术股份有限公司 | Coke drying system is dried temperature and saves control device and method with flow quantity self-adjusting |
| CN105509084A (en) * | 2016-01-29 | 2016-04-20 | 叶立英 | Method and system for heating boiler intake air and coal powder carried by intake air |
| CN107119160A (en) * | 2017-07-10 | 2017-09-01 | 中冶华天南京工程技术有限公司 | A kind of blast-furnace coal powder injection method preheated with compressed gas and system |
| CN107828927A (en) * | 2017-12-06 | 2018-03-23 | 中冶赛迪工程技术股份有限公司 | The ciculation fluidized pressing technology of Coal Grinding System of Pci discharged gas fume and device |
| CN109353825B (en) * | 2018-12-11 | 2023-07-18 | 鞍钢集团工程技术有限公司 | Powdery material preheating pneumatic conveying device and process |
| CN110332527A (en) * | 2019-07-16 | 2019-10-15 | 华电郑州机械设计研究院有限公司 | A kind of circulating fluidized bed boiler solid waste feeding system |
| CN110863071A (en) * | 2019-12-06 | 2020-03-06 | 中冶华天南京工程技术有限公司 | Blast furnace coal powder preheating system and coal powder preheating method and blockage treatment method thereof |
| CN112725556B (en) * | 2021-01-19 | 2022-06-28 | 付光明 | Method and device for heating pulverized coal by using blast furnace molten iron dedusting circulating hot flue gas |
| CN115044726A (en) * | 2022-06-15 | 2022-09-13 | 广东韶钢松山股份有限公司 | Device system and method for controlling flue gas of blast furnace hot blast stove |
| CN116064982B (en) * | 2023-01-29 | 2024-04-19 | 上海开鸿环保科技有限公司 | Method for recycling waste heat and residual energy of tail gas of coal injection and powder preparation of blast furnace |
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