CN106337099B - The low powder coal spraying process method processed of one kind power consumption - Google Patents
The low powder coal spraying process method processed of one kind power consumption Download PDFInfo
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- CN106337099B CN106337099B CN201610827978.4A CN201610827978A CN106337099B CN 106337099 B CN106337099 B CN 106337099B CN 201610827978 A CN201610827978 A CN 201610827978A CN 106337099 B CN106337099 B CN 106337099B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
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Abstract
The present invention relates to powder coal powder injection technology processed, more particularly to a kind of process for low powder coal powder injection processed of consuming energy；Step includes：A. needed to predict the coal dust time processed according to production, open air exhauster and waste gas in hot-blast stove is pumped into coal pulverizer, control exhaust gas flow and temperature reaches technological requirement；B. when air reaches the temperature needed for dry coal dust in coal pulverizer, raw coal is delivered in coal pulverizer, starts medium-speed pulverizer, coal is milled；C. exhaust gas of hot-blast stove injection is dried after coal dust, and moisture reaches the technological requirement of coal powder injection, enters Pulverized Coal Bin, carries out coal powder injection process operations；The present invention dries coal dust using exhaust gas of hot-blast stove, realizes and disables flue gas stove heat coal dust, iron per ton can the m of gas saving 9 103；Main exhauster frequency is reduced, power consumption is saved；Oxygen content is low in exhaust gas of hot-blast stove, improves the job safety coefficient of pulverized coal preparation system；Medium-speed pulverizer unit-hour output and activity duration are improved, powder amount processed is added.
Description
Technical field
The present invention relates to powder coal powder injection technology processed, more particularly to a kind of process for low powder coal powder injection processed of consuming energy.
Background technology
Energy-saving and emission-reduction are the basic demands to the industrial conventional industries morphological transformation of steel industry, and it is often existing with a National Industrial
Generationization level is closely bound up, only in the sustainable development of starting point based on energy-saving and emission-reduction, and steel industry can be
Continued to develop in benign cycle.
My company is by the way of " anthracite+bituminous coal " mixed injection, and buying coal dust region is concentrated mainly on Shaanxi, mountain
The ground such as west, Hebei, mixed coal powder fixed carbon is in 70% or so, calorific value 30MJ/kg, volatile matter 22%~23%, moisture≤2%, coal dust
With fine size, viscosity is low the characteristics of.
Bf coal injection system cost is the important component of molten iron cost, and the gas consumption of pulverizing process is coal powder injection cost
Key link；Bf coal injection system is broadly divided into powder processed and injection two parts, needs to enter in raw coal during powder coal powder injection processed
Row drying, the dry gas used at present dries gas for combustion furnace and dries the mixed combination drying gas of gas with hot-blast stove, this
Method, need to consume substantial amounts of blast furnace gas, and power consumption is high.
The content of the invention
The present invention accesses the long-range control of microcomputer realization to solve above-mentioned problem by improving the waste gas valve of coal powder injection
System, makes exhaust gas of hot-blast stove be directly entered medium-speed pulverizer without combustion gas furnace, is aided with the frequency conversion of regulation main exhauster to improve hot-blast stove
The method of waste gas consumption, makes up the temperature difference that exhaust gas of hot-blast stove dries gas and combination drying gas, reaches and make full use of exhaust gas of hot-blast stove
The purpose of quality of pc and unit-hour output is not influenceed afterwards.
The invention provides a kind of process for low powder coal powder injection processed of consuming energy, it solves the technical scheme of technical problem
It is：
A kind of process for low powder coal powder injection processed of consuming energy, step is as follows：
Step a. coal powder injections:Needed to predict the coal dust time processed according to production, open the air exhauster being connected with hot-blast stove, exhausting
Waste gas in hot-blast stove is pumped into coal pulverizer by machine, and air exhauster, hot-blast stove air preheater, control are connected between hot-blast stove and coal pulverizer
Valve A and temperature-sensing valve A processed, air exhauster, hot-blast stove air preheater are connected by mixing valve threeway, and wherein control valve A is to waste gas stream
Amount is controlled, and temperature-sensing valve A is controlled to EGT；Waste gas in the hot-blast stove can be empty to exhaust piping and coal pulverizer
Gas is preheated, and the exhausting unit frequency is controllable, controls the exhausted air quantity into coal pulverizer；
Step b. powder：When coal pulverizer inlet temp controlled meter B controls temperature reaches preheating temperature, raw coal is delivered to coal-grinding
Machine, while opening the motor of coal pulverizer, drives medium-speed pulverizer operating, coal is milled；
Step c. is blown drying:The coal dust of step b milleds need to adjust temperature through step a and the hot waste gas of flow is sprayed
Drying is dry, and moisture reaches the technological requirement of coal powder injection, is conveyed into Pulverized Coal Bin, carries out coal powder injection process operations.
The time that air exhauster is opened in the step a is that 2 hours before coal-grinding, exhaust gas of hot-blast stove temperature is 300 DEG C -400 DEG C,
It is 210 DEG C -220 DEG C that exhaust piping and coal pulverizer, which are preheated to temperature, the m3/h of waste gas total amount 120000, the control of coal powder injection waste gas consumption
For 48000 m3/h.
The step b coal pulverizer inlets temperature is 210 DEG C -220 DEG C.
The step b raw coal is bituminous coal and anthracite Mixture Density Networks, and its weight ratio is bituminous coal：Anthracite=1：1.
The invention has the advantages that：
1. ensureing exhaust gas of hot-blast stove coal dust, realize and disable flue gas stove heat coal dust, iron per ton can gas saving 9-10m3；
2. because disabling combustion gas furnace, main exhauster frequency is down to after 38Hz by 41Hz, the about 48kwh of power consumption reduction per hour；
3. oxygen content is reduced in exhaust gas of hot-blast stove, oxygen content in the usage amount reduction mixed coal powder of increase exhaust gas of hot-blast stove,
Improve the job safety coefficient of pulverized coal preparation system；
4. improving 2 tons of medium-speed pulverizer unit-hour output, daily medium-speed pulverizer activity duration 16h increases the ton day of powder amount 32 processed.
Brief description of the drawings
Fig. 1 is a kind of process chart of the process for low powder coal powder injection processed of consuming energy of the present invention.
In figure：1. hot-blast stove, 11. air exhausters, 12. hot-blast stove air preheaters, 121. mixing valves, 13. exhaust pipings,
14. control valve A, 15. temperature-sensing valve A, 2. combustion gas furnaces, 3. coal pulverizers, 31. medium-speed pulverizers, 32. motors, 33. temp controlled meter B, 4. raw coal,
5. Pulverized Coal Bin.
Embodiment
Below in conjunction with the accompanying drawing of the present invention, technical scheme is clearly and completely described.
A kind of process for low powder coal powder injection processed of consuming energy, step is as follows：
Step a. coal powder injections:Needed to predict the coal dust time processed according to production, open the air exhauster 11 being connected with hot-blast stove 1, take out
Waste gas in hot-blast stove 1 is pumped into coal pulverizer 3 by blower fan 11, air exhauster 11, hot-blast stove is connected between hot-blast stove 1 and coal pulverizer 3 empty
Air preheater 12, control valve A14 and temperature-sensing valve A15, air exhauster 11, hot-blast stove air preheater 12 pass through the threeway of mixing valve 121
Connection, wherein control valve A14 is controlled to exhaust gas flow, and temperature-sensing valve A15 is controlled to EGT；In the hot-blast stove
Waste gas exhaust piping 13 and the air of coal pulverizer 3 can be preheated, the frequency of air exhauster 11 is controllable, controls into coal pulverizer 3
Exhausted air quantity；
Step b. powder：When the entrance temp controlled meter B33 of coal pulverizer 3 controls temperature reaches preheating temperature, raw coal 4 is delivered to
Coal pulverizer 3, while opening the motor 32 of coal pulverizer, drives medium-speed pulverizer 31 to operate, coal is milled；
Step c. is blown drying：The coal dust of step b milleds need to adjust temperature through step a and the hot waste gas of flow is sprayed
Drying is dry, and moisture reaches the technological requirement of coal powder injection, is conveyed into Pulverized Coal Bin 5, carries out the process operations of coal powder injection 6.
The time that air exhauster 11 is opened in the step a is that 2 hours before coal-grinding, the EGT of hot-blast stove 1 is 300 DEG C -400
DEG C, it is 210 DEG C -220 DEG C that exhaust piping 13 and coal pulverizer 3, which are preheated to temperature, and the m3/h of waste gas total amount 120000, coal powder injection waste gas is used
Amount control is 48000 m3/h.
The inlet temperature of step b coal pulverizers 3 is 210 DEG C -220 DEG C.
The step b raw coal 4 is bituminous coal and anthracite Mixture Density Networks, and its weight ratio is bituminous coal：Anthracite=1：1.
During implementation, coal powder injection needs to predict the powder time processed according to production, and 2h opens air exhauster and exhaust piping 13 is carried out in advance
Preheating, adjusts the FREQUENCY CONTROL exhausted air quantity of air exhauster 11；When powder inlet temperature processed reaches 210-220 DEG C of hot blast heating by the exhaust gases temperature
When, open medium-speed pulverizer 31 and carry out powder operation processed；According to powder job requirements temperature processed, the bypass of adjustment air preheater 12 is mixed in time
Valve 121 is closed, mix waste gas temperature is adjusted, it is ensured that mix waste gas temperature meets coal dust and dry needs at 210-220 DEG C.
In addition to the implementation, the present invention can also have other embodiment, all use equivalent substitution or equivalent transformation shape
Into technical scheme, all fall within the protection domain of application claims.
Claims (2)
1. a kind of process for low powder coal powder injection processed of consuming energy, step is as follows：
Step a. coal powder injections:Needed to predict the coal dust time processed according to production, opened and hot-blast stove（1）The air exhauster of connection（11）, take out
Blower fan（11）By hot-blast stove（1）Middle waste gas is pumped into coal pulverizer（3）In, hot-blast stove（1）And coal pulverizer（3）Between be connected with air exhauster
（11）, hot-blast stove air preheater（12）, control valve A（14）With temperature-sensing valve A（15）, air exhauster（11）, hot-blast stove air preheat
Device（12）Pass through mixing valve（121）Threeway is connected, wherein control valve A（14）Exhaust gas flow is controlled, temperature-sensing valve A（15）It is right
EGT is controlled；Waste gas in the hot-blast stove can be to exhaust piping（13）And coal pulverizer（3）Air is preheated, institute
State air exhauster（11）Frequency is controllable, controls into coal pulverizer（3）Exhausted air quantity；
Step b. powder：Work as coal pulverizer（3）Entrance temp controlled meter B（33）When control temperature reaches preheating temperature, by raw coal（4）Conveying
To coal pulverizer（3）It is interior, while opening the motor of coal pulverizer（32）, drive medium-speed pulverizer（31）Operating, is milled to coal；
Step c. is blown drying：The coal dust of step b milleds need to adjust temperature through step a and the hot waste gas progress injection of flow is dry
Dry, moisture reaches the technological requirement of coal powder injection, is conveyed into Pulverized Coal Bin（5）, carry out coal powder injection（6）Process operations；
Air exhauster is opened in the step a（11）Time be coal-grinding before 2 hours, hot-blast stove（1）EGT is 300 DEG C -400
DEG C, exhaust piping（13）And coal pulverizer（3）It is 210 DEG C -220 DEG C, the m of waste gas total amount 120000 to be preheated to temperature3/ h, coal powder injection is given up
The control of gas consumption is 48000 m3/h；
Coal pulverizer in the step b（3）Inlet temperature is 210 DEG C -220 DEG C.
2. a kind of process of low powder coal powder injection processed of consuming energy according to claim 1, it is characterised in that the step b
Middle raw coal（4）For bituminous coal and anthracite Mixture Density Networks, its weight ratio is bituminous coal：Anthracite=1：1.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109442465B (en) * | 2018-09-30 | 2020-06-26 | 上海全应科技有限公司 | Fitting sample selection and metering method for instantaneous powder feeding amount of pulverized coal boiler |
| CN109252006A (en) * | 2018-11-12 | 2019-01-22 | 武汉钢铁有限公司 | The coal powder injection apparatus of blast furnace and its control method of controllable medium-speed pulverizer entrance oxygen content |
| 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 |
| CN115130769B (en) * | 2022-07-07 | 2024-03-01 | 青岛恒小火软件有限公司 | Intelligent self-adaptive method for temperature of blast furnace coal injection pulverizing system |
Citations (4)
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|---|---|---|---|---|
| CN101000141A (en) * | 2006-12-28 | 2007-07-18 | 鞍钢股份有限公司 | Blast furnace coal injection method using flue gas of hot blast stove as carrier |
| CN102174663A (en) * | 2011-01-18 | 2011-09-07 | 中冶赛迪工程技术股份有限公司 | Blast-furnace coal injection pulverization flue gas system and control method thereof |
| CN202007237U (en) * | 2011-01-18 | 2011-10-12 | 中冶赛迪工程技术股份有限公司 | Coal injection and pulverization flue gas system for blast furnace |
| CN105349718A (en) * | 2015-12-14 | 2016-02-24 | 芜湖新兴铸管有限责任公司 | Bituminous coal feeding system of blast furnace |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62222006A (en) * | 1986-03-20 | 1987-09-30 | Nippon Steel Corp | Method for feeding and conveying powder to be blown into blast furnace |
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- 2016-09-19 CN CN201610827978.4A patent/CN106337099B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101000141A (en) * | 2006-12-28 | 2007-07-18 | 鞍钢股份有限公司 | Blast furnace coal injection method using flue gas of hot blast stove as carrier |
| CN102174663A (en) * | 2011-01-18 | 2011-09-07 | 中冶赛迪工程技术股份有限公司 | Blast-furnace coal injection pulverization flue gas system and control method thereof |
| CN202007237U (en) * | 2011-01-18 | 2011-10-12 | 中冶赛迪工程技术股份有限公司 | Coal injection and pulverization flue gas system for blast furnace |
| CN105349718A (en) * | 2015-12-14 | 2016-02-24 | 芜湖新兴铸管有限责任公司 | Bituminous coal feeding system of blast furnace |
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Effective date of registration: 20210508 Address after: 833200 the Xinjiang Uygur Autonomous Region Yili Kazakhstan Autonomous Prefecture Kuitun City South Ring Road 109 Patentee after: XINJIANG KUNYU STEEL Co.,Ltd. Address before: 271612 Feicheng City, Tai'an, Shandong Patentee before: SHIHENG SPECIAL STEEL GROUP Co.,Ltd. |
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