CN103486604B - A kind of generation method of drying medium and system thereof - Google Patents
A kind of generation method of drying medium and system thereof Download PDFInfo
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- CN103486604B CN103486604B CN201310391697.5A CN201310391697A CN103486604B CN 103486604 B CN103486604 B CN 103486604B CN 201310391697 A CN201310391697 A CN 201310391697A CN 103486604 B CN103486604 B CN 103486604B
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Abstract
The present invention relates to a kind of generation method and system thereof of drying medium, the method comprises: start combustion gas furnace unit, the high-temperature flue gas that combustion gas furnace unit is produced by oil inflame mixes with air, generates drying medium, to prepare anchracite duff; Enter Pulverized Coal Bin to store, part coal dust is delivered to coal powder collection unit by back powder unit by coal dust supply unit; The coal dust of coal powder collection unit enters the burning of combustion gas furnace unit by feeder unit, produces high-temperature flue gas; Meanwhile, open the control valve on circulation of tail gas unit, the tail gas that powder process unit produces is caused the wind mixed chamber of combustion gas furnace, the high-temperature flue gas produced with combusting coal fines mixes, and generates drying medium.This system comprises: combustion gas furnace unit, coal powder collection unit, circulation of tail gas unit, coal dust supply unit, powder process unit etc.The present invention adopts coal dust as combustion gas furnace fuel, compared with fuel oil, reduces fuel cost; And improve the security of powder process unit, decrease exhaust emissions amount.
Description
Technical field
The present invention relates to a kind of generation method and system thereof of drying medium, particularly relate to a kind of generation method and the system thereof that can reduce the drying medium of fuel cost and fuel pulverizing plant oxygen content.
Background technology
At steel industry, in the pulverized coal preparation process of pulverized coal injection, need drying medium carry out raw coal drying, carry coal dust and carry out transporting and being separated and system inerting, the high-temperature flue gas that drying medium generally adopts exhaust gas of hot-blast stove and combustion gas furnace burning to produce mixes, combustion gas furnace fuel generally adopts blast furnace gas, the fuel cost that drying medium generates is lower, and pulverized coal preparation system oxygen content is easy to control, and safety coefficient is high.
In industries such as nonferrous metallurgy, Coal Chemical Industry and building materials, also need raw coal to be made coal dust as fuel or raw material.But these industries do not have blast furnace gas and exhaust gas of hot-blast stove to use, and drying medium generally adopts the gaseous mixture of combustion gas furnace high-temperature flue gas and air; Combustion gas furnace generally adopts natural gas, liquefied gas or fuel oil as fuel, and the generation fuel cost of these industry pulverizing process drying mediums is higher, and system oxygen content is higher, and the process preparing bituminous coal powder exists potential safety hazard.
Summary of the invention
For above-mentioned pulverized coal preparation Problems existing, the object of the present invention is to provide a kind of generation method and the system thereof that can reduce the drying medium of fuel cost and fuel pulverizing plant oxygen content.
To achieve these goals, the invention provides a kind of generation method of drying medium, comprise the following steps:
1) start combustion gas furnace unit, the high-temperature flue gas that combustion gas furnace unit is produced by oil inflame mixes with air, generates drying medium, to prepare anchracite duff (adopting the flouring technology of medium-speed pulverizer, one-level high concentration cloth bag collection machine);
2), after preparing anchracite duff, enter Pulverized Coal Bin and store, the coal dust of 3-4wt% is delivered to coal powder collection unit by back powder unit by coal dust supply unit;
3) after, the coal dust of coal powder collection unit enters the burning of combustion gas furnace unit by feeder unit, produces high-temperature flue gas;
4) simultaneously, open the control valve on circulation of tail gas unit, the tail gas that powder process unit produces is caused the wind mixed chamber of combustion gas furnace, the high-temperature flue gas produced with combusting coal fines mixes, generating the drying medium meeting the drying medium (step 1) of powder process requirement is that the high-temperature flue gas that produces of non-combusted fuels and air mix, and just adopt in the starting stage of system cloud gray model, object produces coal dust in the starting stage, after coal dust is made, namely adopt step 4) produce drying medium; Step 4) drying medium be that the high-temperature flue gas of the generation of combusting coal fines and recycled offgas mix).
Further, in the generation method of above-mentioned drying medium, wherein step 1) concentration of volume percent of described high-temperature flue gas is 25-35%; The concentration of volume percent of described air is 65-75%; The oxygen content of described drying medium by volume percent concentration counts 18-19%.
Further, in the generation method of above-mentioned drying medium, wherein step 2) coal dust of 96-97wt% is delivered to the industrial furnace in production by coal dust supply unit in described Pulverized Coal Bin.
Further, in the generation method of above-mentioned drying medium, wherein step 4) concentration of volume percent of tail gas that produces of described powder process unit is 20-30%; The concentration of volume percent of the high-temperature flue gas that described combusting coal fines produces is 70-80%.
Further, in the generation method of above-mentioned drying medium, wherein step 4) described drying medium oxygen content by volume percent concentration meter be no more than 14%, temperature is no more than 300 DEG C.
The present invention also provides a kind of generation system of drying medium, comprising: combustion gas furnace unit, coal powder collection unit, circulation of tail gas unit, coal dust supply unit, powder process unit; The outlet of described combustion gas furnace unit is connected to the import of described powder process unit; The top of described coal powder collection unit is provided with cloth bag collection machine, for discharge and the filtration coal dust of coal dust conveying gas; And the bottom of described coal powder collection unit is provided with feeder unit, for the quantitative supply of the coal dust burner to combustion gas furnace unit coal dust; The import of described coal dust supply unit is connected to the outlet of described Pulverized Coal Bin; The outlet of described coal dust supply unit is connected to the import of described coal powder collection unit by back powder pipeline; The import of described Pulverized Coal Bin is connected to the outlet of described powder process unit; The outlet of described powder process unit is connected to the import of main exhaust fan, and the outlet of described main exhaust fan connects the import of circulation of tail gas unit, and the outlet of described circulation of tail gas unit is connected by the wind mixed chamber of pipeline with combustion gas furnace unit.
Further, in the generation system of above-mentioned drying medium, wherein said combustion gas furnace unit is provided with coal dust burner and oil burner, and is equipped with oil pump station and combustion fan.
Further, in the generation system of above-mentioned drying medium, the export pipeline of wherein said combustion fan is divided into two, and is connected respectively with coal dust burner and oil burner.
Further, in the generation system of above-mentioned drying medium, wherein said circulation of tail gas unit is provided with control valve.
Further, in the generation system of above-mentioned drying medium, the outlet of wherein said coal dust supply unit is connected to described industrial furnace.
Compared with prior art, the invention has the advantages that:
The present invention adopts coal dust as combustion gas furnace fuel, adopts fuel oil to produce high-temperature flue gas as fuel with prior art, and high-temperature flue gas and air mix and generate compared with powder process drying medium, reduce fuel cost; And in the circulation of tail gas of powder process unit utilizes, reduce the oxygen content of powder process unit, improve the security of powder process unit, decrease exhaust emissions amount.The generation fuel cost of drying medium of the present invention is lower, and system oxygen content is low, and the process preparing bituminous coal powder is safer.
Accompanying drawing explanation
Fig. 1 is the structural representation of drying medium generation system of the present invention.
Description of reference numerals: 1-combustion gas furnace unit; 2-coal dust burner; 3-oil burner; 4-combustion fan; 5-oil pump station; 6-charging gear; 7-coal powder collection unit; 8-cloth bag collection machine; 9-control valve; 10-circulation of tail gas unit; 11-coal dust supply unit; 12-back powder pipeline; 13-powder process unit; 14-Pulverized Coal Bin; 15-industrial furnace; 16-main exhaust fan.
Detailed description of the invention
For understanding the present invention better, below in conjunction with drawings and Examples, the invention will be further described.
Embodiment 1: as shown in Figure 1, powder process unit 13 initial operating stage, start combustion gas furnace unit 1, combustion gas furnace unit 1 adopts oil pump station 5 to be supplied to the fuel oil of oil burner 3 as fuel, the air burning blasted with combustion fan 4 produces high-temperature flue gas, high-temperature flue gas mixes with air, generates drying medium, to prepare anchracite duff; After preparing anchracite duff, enter Pulverized Coal Bin 14 and store.Part coal dust is delivered to coal powder collection unit 7(major part by back powder pipeline 12 and is delivered to industrial furnace 15 in production by coal dust supply unit 11 by coal dust supply unit 11, cloth bag collection machine 8 is back flushing type powder collector, for coal dust conveying gas (nitrogen, coal dust supply unit 11 adopts nitrogen pulverized coal conveying) discharge and filter coal dust (i.e. gas powder be separated, to collect coal dust)); (powder process unit 13 normally runs) coal dust enters combustion gas furnace unit 1 by feeder unit 6 and burns (combustion gas furnace unit 1 uses coal dust instead as fuel) afterwards, produces high-temperature flue gas; Meanwhile, open the control valve 9 on circulation of tail gas unit 10, the tail gas in the exit stack of the main exhaust fan 16 of powder process unit 13 is caused the wind mixed chamber of combustion gas furnace 1, mix with coal-fired high-temperature flue gas, generate the drying medium being applicable to pulverized coal preparation.
Embodiment 2: as shown in Figure 1, a kind of generation system of drying medium, comprising: combustion gas furnace unit 1, coal powder collection unit 7, circulation of tail gas unit 10, coal dust supply unit 11, powder process unit 13; The outlet of described combustion gas furnace unit 1 is connected to the import of described powder process unit 13; Described combustion gas furnace unit 1 is provided with coal dust burner 2 and oil burner 3, and is equipped with oil pump station 5 and combustion fan 4; The export pipeline of described combustion fan 4 is divided into two, and is connected respectively with coal dust burner 2 and oil burner 3, and described oil burner 3 is for fuel oil and air mixed combustion; The top of described coal powder collection unit 7 is provided with cloth bag collection machine 8, cloth bag collection machine 8 is back flushing type powder collector, for discharge and the filtration coal dust (namely gas powder is separated, to collect coal dust) of coal dust conveying gas (nitrogen, coal dust supply unit 11 adopts nitrogen pulverized coal conveying); And the bottom of described coal powder collection unit 7 is provided with feeder unit 6, supply coal dust for the quantitative coal dust burner 2 to combustion gas furnace unit 1; The import of described coal dust supply unit 11 is connected to the outlet of described Pulverized Coal Bin 14; The outlet of described coal dust supply unit 11 is connected to described industrial furnace 15; The outlet of described coal dust supply unit 11 is connected to the import of described coal powder collection unit 7 by back powder pipeline 12; The import of described Pulverized Coal Bin 14 is connected to the outlet of described powder process unit 13; The outlet of described powder process unit 13 is connected to the import of main exhaust fan 16, and the outlet of described main exhaust fan 16 connects the import of circulation of tail gas unit 10, and the outlet of described circulation of tail gas unit 10 is connected by the wind mixed chamber of pipeline with combustion gas furnace unit 1; Described circulation of tail gas unit 10 is provided with control valve 9.
The present invention adopts coal dust as combustion gas furnace fuel, compared with fuel oil, reduces fuel cost; In the circulation of tail gas of powder process unit utilizes, reduce the oxygen content of powder process unit, improve the security of powder process unit, decrease exhaust emissions amount; The generation fuel cost of drying medium is lower, and system oxygen content is low, and the process preparing bituminous coal powder is safer.
It is to be noted; above-described embodiment is only for illustrating technical conceive of the present invention; its object is to person skilled in the art can be understood content of the present invention and implement according to this; can not limit the scope of the invention with this; all equivalences done according to essence of the present invention change or amendment, all should be encompassed within protection scope of the present invention.
Claims (2)
1. a generation method for drying medium, is characterized in that, comprise the following steps:
1) start combustion gas furnace unit, the high-temperature flue gas that combustion gas furnace unit is produced by oil inflame mixes with air, and generate drying medium, to prepare anchracite duff, the concentration of volume percent of described high-temperature flue gas is 25-35%; The concentration of volume percent of described air is 65-75%; The oxygen content of described drying medium by volume percent concentration counts 18-19%;
2), after preparing anchracite duff, enter Pulverized Coal Bin and store, the coal dust of 3-4wt% is delivered to coal powder collection unit by back powder unit by coal dust supply unit, and in described Pulverized Coal Bin, the coal dust of 96-97wt% is delivered to the industrial furnace in production by coal dust supply unit;
3) after, the coal dust of coal powder collection unit enters the burning of combustion gas furnace unit by feeder unit, produces high-temperature flue gas;
4) simultaneously, open the control valve on circulation of tail gas unit, the tail gas that powder process unit produces is caused the wind mixed chamber of combustion gas furnace, the high-temperature flue gas produced with combusting coal fines mixes, generate the drying medium meeting powder process requirement, the concentration of volume percent of the tail gas that described powder process unit produces is 20-30%; The concentration of volume percent of the high-temperature flue gas that described combusting coal fines produces is 70-80%; The oxygen content of described drying medium by volume percent concentration meter is no more than 14%, and temperature is no more than 300 DEG C.
2. a generation system for drying medium, is characterized in that, comprising: combustion gas furnace unit, coal powder collection unit, circulation of tail gas unit, coal dust supply unit, powder process unit; The outlet of described combustion gas furnace unit is connected to the import of described powder process unit, described combustion gas furnace unit is provided with coal dust burner and oil burner, and be equipped with oil pump station and combustion fan, the export pipeline of described combustion fan is divided into two, and is connected respectively with described coal dust burner and described oil burner; The top of described coal powder collection unit is provided with cloth bag collection machine, for discharge and the filtration coal dust of coal dust conveying gas; And the bottom of described coal powder collection unit is provided with feeder unit, for the quantitative supply of the coal dust burner to combustion gas furnace unit coal dust; The import of described coal dust supply unit is connected to the outlet of described Pulverized Coal Bin; The outlet of described coal dust supply unit is connected to the import of described coal powder collection unit by back powder pipeline; The outlet of described coal dust supply unit is connected to an industrial furnace; The import of described Pulverized Coal Bin is connected to the outlet of described powder process unit; The outlet of described powder process unit is connected to the import of main exhaust fan, and the outlet of described main exhaust fan connects the import of circulation of tail gas unit, and the outlet of described circulation of tail gas unit is connected by the wind mixed chamber of pipeline with combustion gas furnace unit; Described circulation of tail gas unit is provided with control valve.
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| CN103925606B (en) * | 2014-04-04 | 2016-05-11 | 西安西热锅炉环保工程有限公司 | Gas-fired adds the high-moisture brown coal medium-speed pulverizer pulverized coal preparation system of heat primary air |
| CN107894173A (en) * | 2017-12-13 | 2018-04-10 | 中冶赛迪工程技术股份有限公司 | A kind of full negative pressure coke stoving process of flue gas self-circulation type and system |
| CN113025389A (en) * | 2021-03-05 | 2021-06-25 | 韩乐 | Raw coal treatment equipment and method for treating raw coal by using same |
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