CN103122398A - 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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- CN103122398A CN103122398A CN2013100795324A CN201310079532A CN103122398A CN 103122398 A CN103122398 A CN 103122398A CN 2013100795324 A CN2013100795324 A CN 2013100795324A CN 201310079532 A CN201310079532 A CN 201310079532A CN 103122398 A CN103122398 A CN 103122398A
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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 the smelting iron and steel technical field, be specifically related to a kind of breeze blowing technique and device that utilizes flue gas self-circulation preheating coal dust.
Background technology
Pulverized coal injection is requisite process matched therewith in current blast furnace iron-making process, the blast furnace briquet replacing coke, can effectively alleviating the situation of coking coal resource shortage and reduce pig iron cost, is the gordian technique that changes the blast furnace applied energy constitute, is playing an important role aspect the burnt consumption reduction of joint.
At present, the air conveying Technology of pulverized coal injection be adopt compressed nitrogen, pressurized air or mixed gas both as the carrier pulverized coal conveying to blast furnace, although the method can satisfy the requirement of pulverized coal injection in blast furnace, have the high defective of operation cost.
at present, also there are some to utilize useless flue gas as the pulverized coal injection into blast furna powder craft of carrier pulverized coal conveying, the Chinese patent that is CN 101000141 as publication number discloses a kind of blast-furnace coal powder injection method with waste gas of hot-blast stove flue as carrier, this blast-furnace coal powder injection method utilize waste gas of hot-blast stove flue as for carrier to pulverized coal injection in blast furnace, although obtained to a certain extent the effect that reduces costs, but owing to needing that in implementation process waste gas of hot-blast stove flue could be drawn utilization after overcooling, therefore this blast-furnace coal powder injection method does not possess the ability of pulverized coal preheating, cause the coal dust utilization ratio low.
also have some to utilize useless flue gas to improve the pulverized coal injection into blast furna powder craft of coal dust utilization ratio as thermal source preheating coal dust, the coal dust that the Chinese patent application that is CN102605119A as publication number discloses in a kind of pulverized coal injection in blast furnace process is carried and the pre-heating technique device, although this coal dust is carried and the pre-heating technique device has 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 the indirect preheating mode rather than directly adopt delivery medium as thermal source preheating coal dust, the low temperature heat energy and the inertia speciality that there is no 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 waste discharge flue gas of Coal Grinding System of Pci as the carrier of breeze blowing and the medium of pulverized coal preheating, can improve the utilization ratio of coal dust, cut operating costs and realize the self-circulation of the outer 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:
At first the present invention has 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 the outer waste discharge flue gas of Coal Grinding System of Pci is filtered, cause successively interchanger heating and compressor compresses to the needed temperature and pressure of coal dust delivery technology, and as the carrier of coal dust conveying and the direct medium of pulverized coal preheating, in the coal dust process of pneumatic transmission, with pulverized coal preheating, jet to blast furnace.
Further, described interchanger with the stack gases of hotblast stove as thermal source.
Further, in the coal dust process of pneumatic transmission, coal dust is directly warmed-up to 80 ~ 180 ℃.
Further, the pressure after the compressed machine compression of the outer waste discharge flue gas of described Coal Grinding System of Pci is 0.6 ~ 1.6MPa.
the invention allows for a kind of flue gas self-circulation preheating coal powder blowing device of flue gas self-circulation preheating breeze blowing technique as mentioned above that is applicable to, comprise that the outer waste air flue of an end and Coal Grinding System of Pci is connected and for delivery of the Coal Grinding System of Pci circulating line of waste discharge flue gas outward, on described circulating line outside described conveying Coal Grinding System of Pci the flow direction of waste discharge flue gas be provided with successively for the by-pass valve control of controlling useless flue gas flow, be used for filtering the strainer of useless flue gas impurity, the interchanger that is used for the useless flue gas of heating, be used for the compressor of the useless flue gas of compression and the voltage stabilizing gas-holder of the flue gas voltage stabilizing storage that is used for giving up, the other end of described circulating line is connected with air compensation device on being arranged on the breeze blowing pipeline.
Further, described interchanger is connected with the stack gases transport pipe of hotblast stove.
Further, also comprise the auxiliary lie that is 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 waste discharge flue gas of Coal Grinding System of Pci as the medium of pulverized coal preheating and the carrier of winding-up, compared with prior art, has the following advantages:
1) adopt the outer waste discharge flue gas of Coal Grinding System of Pci of low oxygen content 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 that full nitrogen conveying and nitrogen add compression 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, thereby save nitrogen and pressurized air equal energy source medium, to reduce system operation cost, have 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 can significantly reduce the discharging of carbonic acid gas, and can improve coal dust in blast furnace with the reactivity of carbonic acid gas, the molten damage that effectively reduces coke reacts, 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 Coal Grinding System of Pci of low temperature after heating, compression, direct preheating coal dust in the coal dust process of pneumatic transmission, be conducive to improve the mobility of coal dust in transport pipe, alleviate coal injection thereby the cooling effect of hot blast, the combustion processes of accelerating coal dust are improved the coal dust utilization ratio, reach the purpose that reduces coke ratio and fuel ratio, therefore have fuel-saving effect;
4) the outer waste discharge flue gas of Coal Grinding System of Pci used easily obtains, especially be fit to the direct blowing process of pulverized coal injection of present main flow, because the facility of Coal Grinding System of Pci and Pulverized Coal Injection System with Fuzzy is built jointly in a factory building, can directly with pipeline, the outer waste air of Coal Grinding System of Pci be caused well heater and suction port of compressor, have advantages of that flow process is short, compact construction, having overcome prior art increases the shortcoming of energy consumption and investment because quoting external source of the gas (distant).
Description of drawings
In order to make purpose of the present invention, technical scheme and beneficial effect clearer, the invention provides following accompanying drawing and describe:
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 that the outer waste air flue 1 of an end and Coal Grinding System of Pci is connected and for delivery of the Coal Grinding System of Pci circulating line 11 of waste discharge flue gas outward, be provided with successively for the by-pass valve control 2 of controlling the flue gas flow that gives up along the flow direction of carrying the outer waste discharge flue gas of Coal Grinding System of Pci on circulating line 11, be used for filtering the strainer 3 of useless flue gas impurity, the interchanger 4 that is used for the useless flue gas of heating, be used for the compressor 5 of the useless flue gas of compression and the voltage stabilizing gas-holder 6 of the flue gas voltage stabilizing storage that is used for giving up, the other end of circulating line 11 is connected with air compensation device 8 on being arranged on breeze blowing pipeline 12, breeze blowing pipeline 12 is arranged between winding-up tank 7 and blast furnace 10, and also be provided with the divider 9 that distributes for coal dust before blast furnace 10.Preferably, the interchanger 4 of the present embodiment is connected with the stack gases transport pipe of hotblast stove, namely interchanger 4 with the stack gases of hotblast stove as the outer waste discharge flue gas of thermal source heating Coal Grinding System of Pci, 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 that is set up in parallel with interchanger 4, auxiliary lie 13 is provided with by-pass valve control 14, by auxiliary lie 13 is set, when coal dust does not need preheating or interchanger 4 to break 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 the outer waste discharge flue gas of Coal Grinding System of Pci is filtered, cause successively interchanger 4 heating and compressor 5 and be compressed to the needed temperature and pressure of coal dust delivery technology, and as the carrier of coal dust conveying and the direct medium of pulverized coal preheating, in the coal dust process of pneumatic transmission, with pulverized coal preheating, jet to blast furnace 10.The outer waste discharge flue gas of the present embodiment Coal Grinding System of Pci removes impurity by strainer 3 before entering interchanger 4 heating, and controls flow by the by-pass valve control 2 that is arranged between the outer waste air flue 1 of strainer 3 and Coal Grinding System of Pci.
Preferably, interchanger 4 with the stack gases of hotblast stove as thermal source, can energy efficient, cut operating costs.
Preferably, in the coal dust process of pneumatic transmission, coal dust is directly warmed-up to 80 ~ 180 ℃, thereby is conducive to improve the mobility of coal dust in transport pipe, alleviate coal injection the cooling effect of hot blast, the combustion processes of accelerating coal dust are improved the coal dust utilization ratio.Preferably, the pressure after compressed machine 5 compressions of the outer waste discharge flue gas of Coal Grinding System of Pci is 0.6 ~ 1.6MPa, can satisfy the pressure demand of blast-furnace coal powder injection.The compression pressure of the outer waste discharge flue gas of the waste heat supply temperature of coal dust and Coal Grinding System of Pci is set in the above-mentioned parameter scope according to the actual process demand.
The flue gas self-circulation preheating breeze blowing technique of the present embodiment utilizes the outer waste discharge flue gas of Coal Grinding System of Pci as the medium of pulverized coal preheating and the carrier of winding-up, compared with prior art, has the following advantages:
1) adopt the outer waste discharge flue gas of Coal Grinding System of Pci of low oxygen content 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 that full nitrogen conveying and nitrogen add compression air pulverized coal conveying, and the outer waste discharge flue gas of Coal Grinding System of Pci enters in blast furnace 10, realize blast furnace 10 coal-injection process flue gas self-circulations, thereby save nitrogen and pressurized air equal energy source medium, to reduce system operation cost, have 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 can significantly reduce the discharging of carbonic acid gas, and can improve coal dust in blast furnace with the reactivity of carbonic acid gas, the molten damage that effectively reduces coke reacts, 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 Coal Grinding System of Pci of low temperature after heating, compression, direct preheating coal dust in the coal dust process of pneumatic transmission, be conducive to improve the mobility of coal dust in transport pipe, alleviate coal injection thereby the cooling effect of hot blast, the combustion processes of accelerating coal dust are improved the coal dust utilization ratio, reach the purpose that reduces coke ratio and fuel ratio, therefore have fuel-saving effect;
4) the outer waste discharge flue gas of Coal Grinding System of Pci used easily obtains, especially be fit to the direct blowing process of pulverized coal injection of present main flow, because the facility of Coal Grinding System of Pci and Pulverized Coal Injection System with Fuzzy is built jointly in a factory building, can utilize the overbottom pressure of the outer waste discharge flue gas of Coal Grinding System of Pci, the outer waste discharge flue gas of Coal Grinding System of Pci is caused well heater and suction port of compressor, have advantages of that flow process is short, compact construction, having overcome prior art increases the shortcoming of energy consumption and investment because quoting external source of the gas (distant).
Explanation is at last, above preferred embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is described in detail by above preferred embodiment, but those skilled in the art are to be understood that, can make various changes to it in the form and details, and not depart from claims limited range of the present invention.
Claims (7)
1. flue gas self-circulation preheating breeze blowing technique, it is characterized in that: the overbottom pressure of utilizing the outer waste discharge flue gas of Coal Grinding System of Pci, after the outer waste discharge flue gas of Coal Grinding System of Pci is filtered, cause successively interchanger heating and compressor compresses to the needed temperature and pressure of coal dust delivery technology, and as the carrier of coal dust conveying and the direct medium of pulverized coal preheating, in the coal dust process of pneumatic transmission, with 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 with 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 the coal dust process of pneumatic transmission, coal dust is directly warmed-up to 80 ~ 180 ℃.
4. according to claim 1-3 described flue gas self-circulation of any one preheating breeze blowing techniques is characterized in that: the pressure after the compressed machine compression of the outer waste discharge flue gas of described Coal Grinding System of Pci is 0.6 ~ 1.6MPa.
5. flue gas self-circulation preheating coal powder blowing device that is applicable to as flue gas self-circulation preheating breeze blowing technique as described in claim 1-4 any one, it is characterized in that: comprise that the outer waste air flue of an end and Coal Grinding System of Pci is connected and for delivery of the Coal Grinding System of Pci circulating line of waste discharge flue gas outward, on described circulating line outside described conveying Coal Grinding System of Pci the flow direction of waste discharge flue gas be provided with successively for the by-pass valve control of controlling useless flue gas flow, be used for filtering the strainer of useless flue gas impurity, the interchanger that is used for the useless flue gas of heating, be used for the compressor of the useless flue gas of compression and the voltage stabilizing gas-holder of the flue gas voltage stabilizing storage that is used for giving up, the other end of described circulating line is connected with air compensation device on being arranged on the breeze blowing pipeline.
6. flue gas self-circulation preheating coal powder blowing device according to claim 1, it is characterized in that: described interchanger is connected with the stack gases transport pipe of hotblast stove.
7. according to claim 5 or 6 described flue gas self-circulation preheating coal powder blowing devices, it is characterized in that: also comprise the auxiliary lie that is set up in parallel with described interchanger, described auxiliary lie is provided with by-pass valve control.
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Cited By (10)
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| CN103940213A (en) * | 2014-04-08 | 2014-07-23 | 中冶赛迪工程技术股份有限公司 | Coke drying system dry gas temperature and flow self-adjustment control device and method |
| 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 |
| CN109353825A (en) * | 2018-12-11 | 2019-02-19 | 鞍钢集团工程技术有限公司 | A kind of granular material preheating Pneumatic conveyer and technique |
| 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 |
| CN112725556A (en) * | 2021-01-19 | 2021-04-30 | 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 |
| CN116064982A (en) * | 2023-01-29 | 2023-05-05 | 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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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103940213A (en) * | 2014-04-08 | 2014-07-23 | 中冶赛迪工程技术股份有限公司 | Coke drying system dry gas temperature and flow self-adjustment control device and method |
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| 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 |
| CN109353825A (en) * | 2018-12-11 | 2019-02-19 | 鞍钢集团工程技术有限公司 | A kind of granular material preheating Pneumatic conveyer and technique |
| 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 |
| CN112725556A (en) * | 2021-01-19 | 2021-04-30 | 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 |
| CN116064982A (en) * | 2023-01-29 | 2023-05-05 | 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 |
| 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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