CN100489393C - Blast-furnace coal powder injection method using waste gas of hot-blast stove flue as carrier - Google Patents

Blast-furnace coal powder injection method using waste gas of hot-blast stove flue as carrier Download PDF

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Publication number
CN100489393C
CN100489393C CNB2006101351405A CN200610135140A CN100489393C CN 100489393 C CN100489393 C CN 100489393C CN B2006101351405 A CNB2006101351405 A CN B2006101351405A CN 200610135140 A CN200610135140 A CN 200610135140A CN 100489393 C CN100489393 C CN 100489393C
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blast
coal
hot
air
waste gas
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CN101000141A (en
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汤清华
朱建伟
王志君
王再义
吴炽
邢本策
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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Abstract

The invention provides a blast furnace coal spraying method using flue gas of hot-air furnace, concretely using induced draft fan to draw the flue gas of hot-air furnace through special pipeline and control valve out of the flue, cooling by heat exchanger to enter air compressor, after compression, using coal feeder to blow the pulverized coal inputted by blowing tank to distributor, and thus spraying the pulverized coal into the blast furnace from each tuyere. And it implements waste gas utilization, saving primary energy sources; and helps indirect reduction reaction in furnace, so that secondary energy sources can be utilized; besides, largely avoids waste gas CO2 exhaust, reducing atmospheric pollution; can preheat pulverized coal, increasing combustion speed; and has the same system safety as N2 carrier, especially suitable for large scale blast furnace applications and having extremely remarkable energy saving and environmental protection effects.

Description

A kind of blast-furnace coal powder injection method with waste gas of hot-blast stove flue as carrier
Technical field
The present invention relates to the method that a kind of waste gas of hot-blast stove flue is recycled, is that a kind of waste gas of hot-blast stove flue as that utilizes is realized method to pulverized coal injection for the carrier of coal injection specifically.
Background technology
The waste gas that blast funnace hot blast stove produces when burning stove is directly externally discharging mostly, because CO in the waste gas 2(all the other main components are N up to 35%~42% 2), its temperature reaches 200 ℃~300 ℃.Contaminated environment not only, and cause the waste of the energy.Therefore, develop the method for many waste gas of hot-blast stove flue heat recovery both at home and abroad, as Chinese patent " method and apparatus that the blast-furnace hot-air furnace flue gas exhaust heat utilizes " (application number 85108099), adopt devices such as heat exchange of heat pipe, " come preheating gas and air with fume afterheat, improve Combustion of Hot Air Furnace temperature and hot blast temperature ".Chinese patent application 92106120X provides " a kind of fireproof preventing bursting process of powdering system of bituminous coal ", then is to utilize waste gas of hot-blast stove flue drying and pulverized coal conveying, and the oxygen concentration in the control pulverized coal preparation system atmosphere is guaranteed security of system.Though above-mentioned two kinds of methods have all been utilized stack gases, have certain energy-saving effect, CO 2Emission problem still fail to solve.And the quantity of waste gas of hot-blast stove flue is very big, and the ratio that is utilized is also very limited.
Aspect pulverized coal injection, existing process method is that the coal dust after the processing is delivered to injecting station, by injecting station compression N 2Or compressed air is delivered to distributor as carrier, is assigned to each air port of blast furnace by distributor again, with spray gun coal dust sprayed into blast furnace.And, realize that the recycling and the pulverized coal injection of secondary energy sources combines with the carrier of waste gas of hot-blast stove flue as for conveying and coal injection, yet there are no the relevant data introduction and the precedent of practical application.
Summary of the invention
Purpose of the present invention aims to provide a kind of twice laid, and is safe and reliable, and energy savings reduces and pollutes, and reduces the blast-furnace coal powder injection method of coke ratio.For this reason, the technical scheme taked of the present invention is:
The present invention's waste gas of hot-blast stove flue coal injection system is made up of pipe special, air-introduced machine, heat exchanger, air compressor machine, winding-up jar, coal feeder, distributor, by-pass valve control and spray gun.The technological process of whole system is: be communicated with-draw-temperature control-pressurization-coal supply-blow-provide and deliver-coal powder injection.Be that air-introduced machine is by pipe special and by-pass valve control, waste gas of hot-blast stove flue is drawn from flue, select directly by or after heat exchanger cools, pass through air-introduced machine, enter air compressor machine, be forced into stack gases through air compressor machine and reach the blowing process required pressure, be blown into distributor with the stack gases after the compression through will the jet coal dust of jar of coal feeder again, distributor divided through the air port with spray gun at last to the coal dust in each air port of blast furnace to spray into blast furnace.
Promptly blow needs with coal injection in order to satisfy subsequent process, therefore in course of conveying, must carry out supercharging to stack gases, make the stack gases pressure after the air compressor machine compression reach 0.6~0.8MPa by air compressor machine.
Owing to the temperature of the stack gases of discharging from hot-blast stove is also non-constant, temperature very easily influences the service life of air-introduced machine up to more than 300 ℃ sometimes, even air-introduced machine is burnt out.Therefore, when derivative waste gas of hot-blast stove flue actual temperature is higher than the temperature capacity of air-introduced machine, must cool, make cooled stack gases temperature be lower than the temperature of air-introduced machine requirement by heat exchanger.
It is pointed out that the method that adopts the present invention, can bring some new variation characteristics to blast furnace production process:
1, blast-furnace tuyere circles round and distinguishes the variation of composition of gases within.The introducing of waste gas of hot-blast stove flue can cause the air port to circle round and distinguish interior CO 2Content obviously raises, N 2Content reduces, so can bring certain influence to the combustion process of coal dust before the air port.But because the winding-up gas consumption only accounts for 3-5 ‰ of the blow rate required, its ratio is very little, thereby its influence also is very little.Even CO 2Absorb some heats with the gasification reaction of C, cause local theory's ignition temperature reduction before the air port, but also can compensate by suitable raising air blast oxygen enrichment percentage.
2, the variation of reduction process in the blast furnace.Ironmaking processes is exactly the reduction process of Fe.CO in the cupola well coal gas 2The content increase can make the gasification reaction aggravation of C, so the direct reduction meeting of Fe reduces to some extent.But CO 2With the gasification reaction product C O of C the indirect reduction of Fe is increased.And indirect reduction is exothermic reaction, therefore the bottom heat can take place to the top transfer of heat.And furnace charge decline can be brought this part heat into cupola well, and some smelting stroke variation phenomenons such as thermo-lag are promptly arranged.
The present invention has following remarkable advantage and beneficial effect:
1, makes the carrier of conveying and coal powder injection with stack gases, make refuse obtain utilizing;
2, avoided CO 2A large amount of dischargings, reduce atmosphere pollution, help human health;
3, coal injection is had certain pre-heat effect, can improve the burning velocity of coal dust;
4, enter the interior CO of stove 2Can participate in gasification reaction, increase the indirect reduction of Fe, secondary energy sources are fully used;
5 and N 2Carrier relatively has identical security of system; Compare with carrier of compressed air, owing to reduced the O of system 2Content, thus the security of system is improved.
Description of drawings
Fig. 1 is the process chart with the blast-furnace coal powder injection method of waste gas of hot-blast stove flue as carrier.
Among the figure: chimney 1, hot-blast stove 2, heat exchanger 3, air-introduced machine 4, air compressor machine 5, winding-up jar 6, coal feeder 7, distributor 8, blast furnace 9, by-pass valve control 10.
The specific embodiment
As shown in Figure 1, the present invention system has constituted the waste gas of hot-blast stove flue coal injection system by by-pass valve control 10, heat exchanger 3, air-introduced machine 4, air compressor machine 5, winding-up jar 6, coal feeder 7, distributor 8 and pipe special and spray gun etc., and form and realization is communicated with-draws-temperature control-pressurization-coal supply-blow-provide and deliver-technological processes such as coal powder injection, thereby the systemic-function of realization usefulness waste gas of hot-blast stove flue as carrier coal injection by this system.
Its specific embodiment and implementation step are:
By being communicated in the pipe special on the hot-blast stove flue between chimney 1 and the hot-blast stove 2, air-introduced machine 4 is drawn waste gas of hot-blast stove flue from flue.Air-introduced machine 4 front portions are provided with two passes: one directly links to each other with air-introduced machine 4, is controlled by the by-pass valve control of being located at before the air-introduced machine 10.For the stack gases of suitable temperature, directly enter air-introduced machine 4 through control of turning valve 10; Another centre is connected with air-introduced machine 4 by heat exchanger 3.Be higher than the stack gases of air-introduced machine temperature capacity for observed temperature, need cool off, reduce to suitable temperature through heat exchanger 3.Then, stack gases is sent into air compressor machine 5, be forced into 0.8MPa, promptly reach the operating pressure of blowing process requirement through air compressor machine.The coal dusts that to jet in jars 6 by coal feeder 7 are blown into distributor 8 again, are assigned to each air port of blast furnace by distributor 8, from the air port coal dust are sprayed into blast furnace with spray gun.Thereby finish overall process with waste gas of hot-blast stove flue conveying and coal injection.
The present invention has very good energy-conservation and environment protecting.Result of implementation shows, with dischargeable capacity 3200m 3Blast furnace is an example, and the winding-up solid-gas ratio is about 40Kg (coal)/m 3(gas), pressure are 0.8MPa, on average produce 8000 tons of iron daily, and average coal then needs blowing gas amount 22m than 160Kg/t 3/ min.Use waste gas of hot-blast stove flue instead, press CO 2Content 40% calculates, and can reduce CO every day 2Discharge capacity 12672m 3In addition, spray into CO in the stack gases in the blast furnace 2Have 50% to participate in chemical reaction in the stove, then be equivalent to save the carbon consumption of 0.5Kg/tFe.

Claims (3)

1, a kind of blast-furnace coal powder injection method with waste gas of hot-blast stove flue as carrier, it is characterized in that: by the waste gas of hot-blast stove flue coal injection system that pipe special, air-introduced machine, heat exchanger, air compressor machine, coal feeder, winding-up jar, distributor, by-pass valve control and spray gun are formed, its technological process is: be communicated with-draw-temperature control-pressurization-coal supply-blow-provide and deliver-coal powder injection; Be that air-introduced machine is by pipe special and by-pass valve control, waste gas of hot-blast stove flue is drawn from flue, select directly by or after heat exchanger cools, pass through air-introduced machine, enter air compressor machine, be forced into stack gases through air compressor machine and reach the blowing process required pressure, be blown into distributor with the stack gases after the compression through will the jet coal dust of jar of coal feeder again, distributor divided through the air port with spray gun at last to the coal dust in each air port of blast furnace to spray into blast furnace.
2, blast-furnace coal powder injection method according to claim 1 is characterized in that: the stack gases pressure after the air compressor machine compression is 0.6~0.8MPa.
3, blast-furnace coal powder injection method according to claim 1 is characterized in that: when derivative waste gas of hot-blast stove flue actual temperature is higher than the temperature capacity of air-introduced machine, cool by heat exchanger.
CNB2006101351405A 2006-12-28 2006-12-28 Blast-furnace coal powder injection method using waste gas of hot-blast stove flue as carrier Expired - Fee Related CN100489393C (en)

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LU91517B1 (en) * 2009-01-21 2010-07-22 Paul Wurth A S Method for producing pulverized coal
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CN102382915A (en) * 2010-08-30 2012-03-21 上海国冶工程技术有限公司 Method by adopting carbon dioxide as transmission medium for blast furnace coal injection
CN102060197A (en) * 2010-12-15 2011-05-18 中冶赛迪工程技术股份有限公司 Pneumatic conveying method and system of pulverized coal
JP5789146B2 (en) * 2011-07-13 2015-10-07 株式会社神戸製鋼所 Operation method of pulverized coal fired boiler facility and pulverized coal fired boiler facility
CN102419099B (en) * 2011-11-23 2014-03-26 中冶京诚工程技术有限公司 Method and device for conveying coal dust by utilizing flue gas
CN102605119B (en) * 2012-04-13 2016-08-03 孙慕文 Coal dust conveying during a kind of pulverized coal injection in blast furnace and pre-heating technique device
CN103421914A (en) * 2012-05-20 2013-12-04 符政学 Iron making method introducing exhaust gas of hot-blast stove into blast furnace air
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CN102901115A (en) * 2012-10-31 2013-01-30 山西蓝天环保设备有限公司 High-moisture pulverized coal conveying system
GB2509227B (en) * 2012-12-21 2015-03-18 Siemens Plc A method for supplying blast to a blast furnace
CN103122398B (en) * 2013-03-13 2015-01-28 中冶赛迪工程技术股份有限公司 Smoke self-circulation preheating coal dust injection technology and device
CN103320558A (en) * 2013-06-28 2013-09-25 首钢长治钢铁有限公司 Concentrated-phase coal powder injection method and device of single distributor of large-medium blast furnace
CN103672866B (en) * 2013-11-25 2016-04-06 中国科学院过程工程研究所 A kind of iron-smelting process coal injection furnace preheat burner and method
DE102014216336A1 (en) 2014-08-18 2016-02-18 Küttner Holding GmbH & Co. KG Process for injecting replacement reductants into a blast furnace
CN104676629A (en) * 2015-01-16 2015-06-03 北京朗信能源环保科技有限公司 Method and equipment for reburning combustible solid particles
CN105157018A (en) * 2015-10-19 2015-12-16 无锡清杨机械制造有限公司 Iron and steel smelting energy-saving boiler combustion method
CN106337099B (en) * 2016-09-19 2017-10-10 石横特钢集团有限公司 The low powder coal spraying process method processed of one kind power consumption
CN109694931A (en) * 2019-03-08 2019-04-30 山东钢铁股份有限公司 A kind of pulverized coal injection into blast furna powder system and blast-furnace equipment
CN113355473B (en) * 2021-05-19 2022-06-03 内蒙古赛思普科技有限公司 Method and device for blowing waste flue gas of hot blast stove to smelting reduction furnace
CN113430318A (en) * 2021-05-27 2021-09-24 山东墨龙石油机械股份有限公司 Coal gas modification device for iron bath smelting reduction process

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