CN115820954A - Blast furnace blowing CO 2 Biomass charcoal tempering co-production carbon emission reduction system and application process - Google Patents
Blast furnace blowing CO 2 Biomass charcoal tempering co-production carbon emission reduction system and application process Download PDFInfo
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Abstract
The invention discloses a blast furnace blowing CO 2 A biomass charcoal tempering co-production carbon emission reduction system and an application process, belonging to the technical field of ferrous metallurgy. The system comprises a blast furnace body and CO 2 Gas source, O 2 Air source, air blast gas mixing device, biomass pyrolysis device, coal powder mixing device, coal powder injection device, gas separation device, CO capture device, hot blast stove, combustion-supporting air gas mixing device and hot blast stove tail gas CO 2 A trapping device and an auxiliary pipeline. The system uses agricultural wastes as the injection fuel of the blast furnace-biomass charcoal mixed coal powder after biomass charcoal is obtained by a biomass pyrolysis device and is mixed by a coal powder mixing device; then CO is introduced 2 As carrier gas, the coal powder enters the blast furnace body from a coal powder gun along a coal injection pipeline; from CO 2 Gas source, O 2 The air source and the air source supply air to the air blast air mixing device, the mixed reaction gas enters the hot blast stove to complete complex physical and chemical reaction, and finally the generated molten iron and the slag are discharged from the tapping/slag hole. The system is beneficial to blast furnace coalGas capture and resource utilization of different gases.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a blast furnace for blowing CO 2 A biomass charcoal tempering co-production carbon emission reduction system and an application process.
Background
The energy consumption of the steel industry in China accounts for about 15% of the total energy consumption of China, and the energy consumption of the blast furnace process accounts for about 60% of the energy consumption of the whole process of steel. The blast furnace is not only a large energy consumption household in the steel industry, but also a large emission household. The blast furnace and the pre-iron process mainly use coke and coal powder as fuels, have huge consumption, and are a key link for carrying out ultralow emission modification.
In the face of blast furnace emission reduction pressure, biomass energy is used as a clean renewable energy source, after the biomass energy is pyrolyzed to form biomass carbon, the biomass carbon is used as part of blast furnace coal powder for injection, and the biomass energy blast furnace has the following advantages: (1) The biomass charcoal has low ignition point and good combustibility, and can effectively improve the combustion rate of the coal powder after being mixed with anthracite and bituminous coal to form biomass charcoal mixed coal powder; (2) The combustion rate of the biomass charcoal mixed coal powder is high, the burnout performance becomes good along with the increase of the proportion of the biomass charcoal, the yield of unburned charcoal is reduced, and the smoothness of the furnace condition is facilitated; (3) According to the theory of calculating the whole life cycle of the carbon row, the biomass absorbs CO in the growth process of the biomass 2 Therefore, the biomass is sprayed to reduce carbon emission.
Current researchers are on CO 2 The use of the blast furnace as a blast gas has been studied and found to be CO 2 The use as blast furnace blast gas has the following effects: (1) CO2 2 The tuyere raceway reacts with carbon to absorb heat and generate more CO gas, so that the heat of the upper part and the lower part of the blast furnace is redistributed; (2) When CO is in the hot air 2 CO of blast furnace gas when the proportion increases and the air proportion decreases 2 And the CO concentration increases, its calorific value increases.
The chemical industry has high requirements on gas purity and needsUsing CO of industrially required purity 2 And CO gas is used as a chemical raw material, but the content of CO in the blast furnace gas is about 20-28%, and the content of CO is 2 About 17% to 25% of N 2 About 50% to 55%, H 2 The content is about 1% -2%, the blast furnace gas of the conventional blast furnace is not suitable for chemical synthesis production, and the blast furnace gas must be recycled after being upgraded.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a blast furnace for blowing CO 2 A biomass charcoal tempering CO-production carbon emission reduction system and an application process, wherein the system is used for CO injection 2 Mixing with biomass charcoal to obtain pulverized coal, improving combustion performance of pulverized coal, increasing coal ratio, reducing coke ratio, realizing high oxygen-enriched iron-making production of blast furnace, and increasing iron-making efficiency of blast furnace by using CO 2 The recycling and the toughening co-production process of the furnace top gas realize the double effects of carbon reduction and efficiency improvement.
The invention uses CO 2 Is used as carrier gas and is blown with biomass charcoal to mix coal powder with high CO 2 The mixed reaction gas with concentration reacts to improve the oxygen content of blast furnace blast 2 The concentration, the oxygen enrichment rate and the smelting intensity are improved, the using amount of biomass carbon is increased, the coal ratio can be improved, the coke ratio is reduced, and the smelting cost and carbon emission are reduced; because of blowing CO 2 And oxygen-enriched smelting, the mixing amount of air in the mixed reaction gas is reduced, so that CO and CO in blast furnace gas 2 The concentration of the coal gas is improved, and the subsequent collection of the blast furnace gas and the separation and resource utilization of different gases are facilitated.
The invention uses CO 2 High-quality coal gas generated by biomass charcoal coal powder provides a system for toughening and CO-production carbon emission reduction and an application process, namely, the blast furnace coal gas is treated by top gas to obtain high-quality coal gas and pure CO 2 Three gases, gas and pure CO gas: CO2 2 Recycling of gas to CO 2 The gas source is used as the carrier gas and the blast gas of the blast furnace coal powder injection, and the rest CO 2 Gas and total CO gas are used as chemical raw materials; high quality gas enters the hot blast stove and is mixed with CO 2 And O 2 The mixed combustion-supporting gas reacts, and the blowing gas is heated.
In order to solve the technical problems, the invention provides the following technical scheme:
blast furnace blowing CO 2 The biomass charcoal toughening CO-production carbon emission reduction system comprises a blast furnace body and CO 2 Gas source, O 2 Air source, air blast gas mixing device, biomass pyrolysis device, coal powder mixing device, coal powder injection device, gas separation device, CO capture device, hot blast stove, combustion-supporting air gas mixing device and hot blast stove tail gas CO 2 A trapping device and an auxiliary pipeline,
the biomass pyrolysis device is connected with the pulverized coal mixing device through a pipeline, the pulverized coal mixing device is connected with the pulverized coal injection device through a pipeline, the upper part of the blast furnace body is connected with the gas separation device through a pipeline, and the gas separation device is connected with the CO capture device, the hot blast stove and the CO through pipelines 2 Source of gas, CO 2 Gas source and O 2 The air source and the air source are connected with a blast air mixing device through pipelines, the blast air mixing device is connected with a hot blast stove through a pipeline, and CO is 2 Gas source and O 2 The air source is respectively connected with a combustion-supporting air gas mixing device through a pipeline, the combustion-supporting air gas mixing device is connected with a hot blast stove through a pipeline, and the hot blast stove is connected with tail gas CO of the hot blast stove through a pipeline 2 A trapping device.
The blast furnace injects CO 2 The application process of the biomass charcoal toughening co-production carbon emission reduction system is as follows:
s1, biomass charcoal is obtained from agricultural wastes through a biomass pyrolysis device, and the biomass charcoal is mixed with anthracite and bituminous coal in a coal powder mixing device to obtain biomass charcoal mixed coal powder which is used as a blast furnace injection fuel;
s2, from CO 2 CO output from gas source 2 As carrier gas, mixing with biomass charcoal to form CO 2 -a mixed flow of pulverized coal, entering the blast furnace body from a pulverized coal lance along a coal injection duct;
s3, preparing a catalyst from CO 2 Gas source, O 2 The air source and the air source supply air to the air blast air mixing device to produce mixed reaction gas, the mixed reaction gas enters a hot blast stove, the mixed reaction gas is heated in the hot blast stove to be high-temperature mixed reaction gas, and the high-temperature mixed reaction gas enters a tuyere convolution region of the blast furnace from a tuyere along a hot blast pipeline to react with biomass charcoal mixed pulverized coal;
and S4, adding the iron ore, the coke and the flux from a blast furnace feeding system, and finishing a physical and chemical reaction in a countercurrent (furnace burden descending and coal gas ascending) process to finally react to generate molten iron and slag.
And in the step S1, the content of fixed carbon in the biomass charcoal obtained by the agricultural waste through the biomass pyrolysis device is not less than 70%.
The mixing proportion of the biomass charcoal in the biomass charcoal mixed coal powder obtained in the step S1 is 5-80%.
CO in the blowing gas mixing device in the step S3 2 The blowing ratio is 5-50%, and O 2 The blowing ratio of the air is 5-60%, and the blowing ratio of the air is 0-80%.
The high-temperature mixed reaction gas in S3 and CO in S2 2 After entering the blast furnace body, the pulverized coal mixed flow is subjected to combustion reaction with coke in the tuyere area to generate reducing gas with the CO concentration of 70-90%, the reducing gas ascends to sequentially pass through a dripping zone, a soft melting zone and a blocky zone in the blast furnace body to perform reduction reaction with descending iron ore and generate blast furnace gas, the CO concentration in the blast furnace gas is 35-70%, and the CO concentration in the blast furnace gas is 35-70% 2 The concentration is 15-50%.
20-30% of the blast furnace gas is used for combustion power generation, and the rest of the blast furnace gas is subjected to gas separation to obtain CO 2 And high quality coal gas;
25% -45% of the obtained high-quality coal gas is used for entering a hot blast stove to heat injection gas, and the rest high-quality coal gas passes through a CO trapping device to obtain CO gas;
said obtained CO 2 50% -70% of CO 2 Recycled to CO 2 The gas source is used as the carrier gas and blast gas of the blast furnace coal powder injection, and the rest CO 2 The gas and the total CO gas are used as chemical raw materials.
The CO is 2 Gas source, O 2 The gas source forms combustion-supporting air mixed gas to supply gas to the combustion-supporting air mixed gas device, wherein, CO 2 The proportion of O is 55-70 percent 2 The proportion is 30-45%.
The combustion-supporting air mixed gas enters the hot blast stove, and the high-quality coal gas and the combustion-supporting air mixed gas in the hot blast stoveReaction combustion, and the generated tail gas of the hot blast stove enters the tail gas CO of the hot blast stove 2 A trap device for trapping and obtaining CO 2 And then transferred to CO 2 And (4) a gas source.
In the invention, because the ignition point of the biomass charcoal is low and the combustion speed is high, the mixture of the biomass charcoal and the pulverized coal is injected, the comprehensive combustion performance of the injected pulverized coal can be obviously improved, the generation amount of coke non-combusted charcoal is reduced, and the coke is protected. In addition, the biomass carbon can increase the injection amount of coal powder, improve the coal ratio, reduce the coke ratio and save the cost, and according to the full life cycle theory, the biomass carbon is injected to be beneficial to reducing CO of the blast furnace 2 And (4) discharging.
At the same time, due to CO 2 The heat absorption is carried out by the reaction between the tuyere raceway and the carbon, the heat supplement can be carried out by adopting a mode of improving the oxygen enrichment rate, the smelting intensity of the blast furnace is further improved, the application of the blast furnace with high oxygen enrichment is realized, the combustibility of the biomass is good, and the biomass and CO react with each other to absorb heat 2 The burnout rate of the mixed combustion is high, and the complete combustion of the pulverized coal in front of the tuyere is facilitated. In addition, CO injection 2 The operation makes the blast furnace self consume CO 2 Thereby reducing carbon emissions.
CO and CO in high-quality coal gas generated by blast furnace 2 The concentration of the (C) is high, which is beneficial to the CO and CO in the blast furnace gas in the subsequent process 2 Separation, purification and capture utilization of (1), and the generation of CO in blast furnace 2 The method is used for the toughening co-production, not only can reduce the carbon emission of enterprises, but also can increase the added value of products for the enterprises.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
1. partial bituminous coal is replaced by adopting a biomass blowing mode in a proper proportion, so that the comprehensive combustion performance of the pulverized coal is improved, the quantity of unburned carbon in a tuyere raceway is reduced, and the coke ratio and CO are reduced 2 And (5) discharging.
2. Mixing of CO into blast gas 2 And with CO 2 As the carrier gas of the injected coal dust, the coal dust and CO at the tuyere raceway are enabled to be mixed 2 More CO is generated and absorbs heat, and O in blast air is increased in an oxygen enrichment mode 2 Concentration, accelerates the combustion of the carbon in front of the tuyere, improves the smelting efficiency of the blast furnace,and the quality of the blast furnace gas is improved.
3. Because of CO and CO in blast furnace gas 2 The concentration of the carbon dioxide is increased, the cost for capturing and utilizing the carbon dioxide is reduced, and a reasonable toughening CO-production mode is selected, so that not only can CO be reduced 2 The emission of the waste water can bring the income of selling high value-added chemical products for enterprises.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 shows the present invention of blowing CO into a blast furnace 2 -a structural layout of a biomass char steelmaking co-production carbon abatement system;
wherein, 1-a biomass pyrolysis device; 2-a pulverized coal mixing device; 3-a pulverized coal injection device; 4-a gas separation device; 5-a CO capture device; 6-hot blast stove; 7-a blast air mixing device; 8-combustion-supporting air mixing device; 9-Hot-blast stove Tail gas CO 2 A trapping device; 10-CO 2 A gas source; 11-O 2 A gas source; 12-air source.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a blast furnace blowing CO 2 A biomass charcoal tempering co-production carbon emission reduction system and an application process.
As shown in FIG. 1, the blast furnace injects CO 2 The biomass charcoal toughening CO-production carbon emission reduction system comprises a blast furnace body and CO 2 Gas source 10, O 2 The biomass pyrolysis device comprises a gas source 11, an air source 12, a blast gas mixing device 7, a biomass pyrolysis device 1, a coal powder mixing device 2, a coal powder injection device 3, a gas separation device 4, a CO capture device 5, a hot blast stove 6, a combustion-supporting air gas mixing device 8 and hot blast stove tail gas CO 2 Trapping device 9 and auxiliary pipeline，
The biomass pyrolysis device 1 is connected with a pulverized coal mixing device 2 through a pipeline, the pulverized coal mixing device 2 is connected with a pulverized coal injection device 3 through a pipeline, the upper part of a blast furnace body is connected with a gas separation device 4 through a pipeline, and the gas separation device 4 is connected with a CO trapping device 5, a hot blast stove 6 and a CO trapping device 6 through pipelines 2 Gas source 10, CO 2 Gas sources 10 and O 2 The air source 11 and the air source 12 are both connected with the air blast air mixing device 7 through pipelines, the air blast air mixing device 7 is connected with the hot blast stove 6 through a pipeline 2 Gas sources 10 and O 2 The air source 11 is respectively connected with a combustion-supporting air gas mixing device 8 through a pipeline, the combustion-supporting air gas mixing device 8 is connected with a hot blast stove 6 through a pipeline, and the hot blast stove 6 is connected with a hot blast stove tail gas CO through a pipeline 2 A trapping device 9.
The blast furnace injects CO 2 The application process of the biomass charcoal toughening co-production carbon emission reduction system is as follows:
s1, biomass charcoal is obtained from agricultural wastes through a biomass pyrolysis device, and the biomass charcoal is mixed with anthracite and bituminous coal in a coal powder mixing device to obtain biomass charcoal mixed coal powder which is used as a blast furnace injection fuel;
s2, from CO 2 CO output from gas source 2 As carrier gas, mixing with biomass charcoal to form CO 2 -a mixed flow of pulverized coal, entering the blast furnace body from a pulverized coal lance along a coal injection duct;
s3, from CO 2 Gas source, O 2 The air source and the air source supply air to the air blast air mixing device to produce mixed reaction gas, the mixed reaction gas enters a hot blast stove, the mixed reaction gas is heated in the hot blast stove to be high-temperature mixed reaction gas, and the high-temperature mixed reaction gas enters a tuyere convolution region of the blast furnace from a tuyere along a hot blast pipeline to react with biomass charcoal mixed pulverized coal;
and S4, adding the iron ore, the coke and the flux from a blast furnace feeding system, completing a physical and chemical reaction in a counter-current process, and finally reacting to generate molten iron and slag.
The following description is given with reference to specific examples.
Example 1
A blast furnace blowing CO 2-biomass carbon tempering CO-production carbon emission reduction system based on transformation of a certain 5500m < 3 > blast furnace and an application process.
The application process of the blast furnace blowing CO 2-biomass charcoal toughening CO-production carbon emission reduction system comprises the following specific operation methods:
(step 1): the method comprises the following steps that agricultural wastes such as straws and the like pass through a biomass pyrolysis device to obtain biomass charcoal with the fixed carbon content of more than 70%, and when the biomass charcoal passes through a coal powder mixing device, the biomass charcoal is mixed according to the proportion of 12% and then is used as the injection fuel-biomass charcoal mixed coal powder of a blast furnace;
(step 2): CO2 is used as carrier gas and is mixed with biomass carbon to form CO 2-coal powder mixed flow, and then the mixed flow enters a blast furnace body from a coal powder gun along a coal injection pipeline;
(step 3): supplying air to the air blast air mixing device by a CO2 air source, an O2 air source and an air source, preparing mixed reaction air according to the injection proportion of CO2 being 20%, the injection proportion of O2 being 40% and the injection proportion of air being 40%, feeding the mixed reaction air into a hot blast stove, heating the mixed reaction air in the hot blast stove to be high-temperature mixed reaction air, feeding the mixed reaction air into a tuyere convolution region of the blast furnace along a hot blast pipeline from a tuyere to react with biomass charcoal mixed pulverized coal;
(step 4): adding iron ore, coke and flux from a blast furnace feeding system, completing complex physical and chemical reactions in the countercurrent (furnace burden descending and coal gas ascending) process, and finally reacting to generate molten iron and slag which are discharged from an iron/slag outlet;
(step 5): after the mixed flow of the high-temperature mixed reaction gas and the CO 2-biomass charcoal mixed coal powder enters the blast furnace body, the mixed flow and coke are subjected to combustion reaction in the tuyere area to generate reducing gas with the CO concentration of 70%; the reducing gas rises to sequentially pass through the dripping zone, the reflow zone and the lump zone to perform reduction reaction with the descending ore, and high-quality blast furnace gas is generated, wherein the concentration of CO in the blast furnace gas is 35 percent, and the concentration of CO2 in the blast furnace gas is 30 percent;
(step 6): 30% of the blast furnace gas is used for combustion power generation, and the rest blast furnace gas is subjected to gas separation to obtain CO2 and high-quality gas: 45 percent of high-quality coal gas is used for entering a hot blast stove to heat the injected gas, and the rest high-quality coal gas passes through a CO trapping device to obtain CO gas; 50% of CO2 is circulated to a CO2 gas source to be used as carrier gas and blast gas of coal dust injected into the blast furnace, and the rest CO2 gas and all CO gas are used as chemical raw materials;
(step 7): supplying gas to the combustion-supporting air gas mixing device by a CO2 gas source and an O2 gas source, forming combustion-supporting air gas mixing gas by the proportion of 70 percent of CO2 and 30 percent of O2, entering a hot blast stove, reacting and burning high-quality coal gas in the hot blast stove and the combustion-supporting air gas mixing gas, entering the tail gas CO2 trapping device of the hot blast stove for trapping the generated tail gas with high CO2 concentration to obtain CO2, and then conveying the CO2 to the CO2 gas source.
After the technology is implemented:
the coal injection ratio for producing ton iron is 180 kg/t, after biomass charcoal is used for mixing and injection, the coal injection ratio is increased by 13 kg/t iron, and the coke ratio is reduced to 10 kg/t iron;
the characteristics of good combustion and low ignition point of biomass are utilized to increase the blowing proportion of CO2, thereby realizing the iron-making production of a high oxygen-enriched blast furnace and improving the smelting strength
The effective volume utilization coefficient is improved
；
Except CO2 generated by combustion power generation, the CO2 generated in the iron making process can be completely recycled, the emission of CO2 is avoided, and the emission of CO2 is directly reduced by about 500m3 per ton of iron in the blast furnace process; the blast furnace consumes agricultural wastes, and the emission of CO2 can be reduced by 24 m3 per ton of iron;
the amount of CO in tail gas generated by blast furnace ironmaking is 500m3 per ton of iron, and the amount of CO2 gas used for producing chemical products is 270 m3 per ton of iron.
Example 2
Based on a certain 1780m 3 Blast furnace CO injection for blast furnace improvement 2 A biomass charcoal tempering co-production carbon emission reduction system and an application process.
The blast furnace injects CO 2 An application process of the biomass charcoal toughening co-production carbon emission reduction system comprises the following specific operation methods:
(step 1): the method comprises the following steps that agricultural wastes such as straws and the like pass through a biomass pyrolysis device to obtain biomass charcoal with the fixed carbon content of more than 70%, and when the biomass charcoal passes through a coal powder mixing device, the biomass charcoal is mixed according to the proportion of 15% and then is used as the injection fuel-biomass charcoal mixed coal powder of a blast furnace;
(step 2): introducing CO 2 As carrier gas, the biomass charcoal mixed coal powder forms coal powder mixed flow, and then the coal powder mixed flow enters the blast furnace body along a coal injection pipeline from a coal powder gun;
(step 3): supplying air to the air blast air mixing device by a CO2 air source, an O2 air source and an air source, manufacturing mixed reaction gas according to the condition that the injection proportion of CO2 is 30 percent, the injection proportion of O2 is 60 percent and the injection proportion of air is 10 percent, feeding the mixed reaction gas into a hot blast stove, heating the mixed reaction gas in the hot blast stove to be high-temperature mixed reaction gas, feeding the mixed reaction gas into a tuyere convolution area of the blast furnace along a hot blast pipeline from a tuyere to react with biomass charcoal mixed pulverized coal;
(step 4): adding iron ore, coke and flux from a blast furnace feeding system, completing complex physical and chemical reactions in the countercurrent (furnace burden descending and coal gas ascending) process, and finally reacting to generate molten iron and slag which are discharged from an iron/slag outlet;
(step 5): after the mixed flow of the high-temperature mixed reaction gas and the CO 2-biomass charcoal mixed coal powder enters the blast furnace body, the mixed flow and coke are subjected to combustion reaction in the tuyere area to generate reducing gas with the CO concentration of 90%; the reducing gas rises to sequentially pass through the dripping zone, the reflow zone and the blocky zone to perform reduction reaction with the falling ore and generate high-quality blast furnace gas, wherein the CO concentration in the blast furnace gas is 50 percent, and the CO2 concentration in the blast furnace gas is 45 percent;
(step 6): 20% of the blast furnace gas is used for combustion power generation, and the rest blast furnace gas passes through a gas separation device to obtain CO2 and high-quality gas: 25% of high-quality coal gas is used for entering a hot blast stove to heat the injected gas, and the rest high-quality coal gas passes through a CO trapping device to obtain CO gas; 70% of CO2 is circulated to a CO2 gas source to be used as carrier gas and blast gas of coal dust injected into the blast furnace, and the rest CO2 gas and all CO gas are used as chemical raw materials;
(step 7): supplying gas to the combustion-supporting air gas mixing device by a CO2 gas source and an O2 gas source, forming combustion-supporting air gas mixing gas by using 55% of CO2 and 45% of O2, feeding the combustion-supporting air gas mixing gas into a hot blast stove, reacting and burning high-quality coal gas and the combustion-supporting air gas mixing gas in the hot blast stove, feeding the generated hot blast stove tail gas with high CO2 concentration into a hot blast stove tail gas CO2 trapping device, trapping to obtain CO2, and then conveying to the CO2 gas source.
After the technology is implemented:
the coal injection ratio for producing ton iron is 200 kg/t, after biomass charcoal is mixed and injected, the coal injection ratio is increased by 18 kg/t iron, and the coke ratio is reduced to 14 kg/t iron;
by utilizing the characteristics of good combustibility and low ignition point of biomass, the CO2 injection proportion is increased, the high-oxygen-enriched blast furnace ironmaking production is realized, and the smelting intensity is improved
The effective volume utilization coefficient is improved
；
Removing CO generated by combustion power generation 2 In addition, CO produced in the iron-making process 2 Can be completely recycled, and avoids CO 2 Emission, directly reducing emission of CO in ton of iron in blast furnace process 2 About 550 m 3 (ii) a The blast furnace consumes agricultural wastes and can reduce CO emission per ton of iron 2 Is 33 m 3 ；
The CO in the tail gas generated by blast furnace ironmaking is used for producing chemical products of ton iron 640 m 3 CO for the production of chemical products 2 The gas is ton iron 360 m 3 。
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. Blast furnace blowing CO 2 The biomass charcoal tempering CO-production carbon emission reduction system is characterized by comprising a blast furnace body and CO 2 Gas source, O 2 Air source, air blast gas mixing device, biomass pyrolysis device, coal powder mixing device, coal powder injection device, gas separation device, CO capture device, hot blast stove, combustion-supporting air gas mixing device and hot blast stove tail gas CO 2 A trapping device and an auxiliary pipeline,
the biomass pyrolysis device is connected with the pulverized coal mixing device through a pipelineThe coal powder mixing device is connected with the coal powder injection device through a pipeline, the upper part of the blast furnace body is connected with the gas separation device through a pipeline, and the gas separation device is connected with the CO trapping device, the hot blast stove and the CO through pipelines 2 Source of gas, CO 2 Gas source and O 2 The air source and the air source are connected with a blast air mixing device through pipelines, the blast air mixing device is connected with a hot blast stove through a pipeline, and CO is 2 Gas source and O 2 The air source is respectively connected with a combustion-supporting air gas mixing device through a pipeline, the combustion-supporting air gas mixing device is connected with a hot blast stove through a pipeline, and the hot blast stove is connected with tail gas CO of the hot blast stove through a pipeline 2 A trapping device.
2. Blast furnace blowing CO based on claim 1 2 -application process of biomass charcoal-based steel CO-production carbon emission reduction system, characterized in that the blast furnace injects CO 2 The application process of the biomass charcoal tempering co-production carbon emission reduction system is as follows:
s1, biomass charcoal is obtained from agricultural wastes through a biomass pyrolysis device, and the biomass charcoal is mixed with anthracite and bituminous coal in a coal powder mixing device to obtain biomass charcoal mixed coal powder which is used as a blast furnace injection fuel;
s2, from CO 2 CO output from gas source 2 As carrier gas, mixing with biomass charcoal to form CO 2 -a mixed flow of pulverized coal, entering the blast furnace body from a pulverized coal lance along a coal injection duct;
s3, preparing a catalyst from CO 2 Gas source, O 2 The air source and the air source supply air to the air blast air mixing device to produce mixed reaction gas, the mixed reaction gas enters a hot blast stove, the mixed reaction gas is heated in the hot blast stove to be high-temperature mixed reaction gas, and the high-temperature mixed reaction gas enters a tuyere convolution region of the blast furnace from a tuyere along a hot blast pipeline to react with biomass charcoal mixed pulverized coal;
and S4, adding the iron ore, the coke and the flux from a blast furnace feeding system, completing a physical and chemical reaction in a counter-current process, and finally reacting to generate molten iron and slag.
3. The blast furnace blowing CO of claim 2 2 Application of system for combined production of carbon and emission reduction by toughening biomass carbonThe process is characterized in that the content of fixed carbon in the biomass charcoal obtained by the agricultural waste through the biomass pyrolysis device in the step S1 is not less than 70%.
4. The blast furnace blowing CO of claim 2 2 An application process of the biomass charcoal toughening co-production carbon emission reduction system is characterized in that the mixing proportion of the biomass charcoal in the biomass charcoal mixed pulverized coal obtained in the step S1 is 5% -80%.
5. The blast furnace blowing CO of claim 2 2 Application process of the biomass charcoal tempering CO-production carbon emission reduction system, characterized in that CO in the blast gas mixing device in the step S3 2 The blowing ratio is 5-50%, and O 2 The blowing ratio of the air is 5-60%, and the blowing ratio of the air is 0-80%.
6. The blast furnace blowing CO of claim 2 2 -application process of biomass charcoal tempering CO-production carbon emission reduction system, characterized in that the high temperature mixed reaction gas in S3 and CO in S2 2 After entering the blast furnace body, the pulverized coal mixed flow is subjected to combustion reaction with coke in the tuyere area to generate reducing gas with the CO concentration of 70-90%, the reducing gas ascends to sequentially pass through a dripping zone, a soft melting zone and a blocky zone in the blast furnace body to perform reduction reaction with descending iron ore and generate blast furnace gas, the CO concentration in the blast furnace gas is 35-70%, and the CO concentration in the blast furnace gas is 35-70% 2 The concentration is 15-50%.
7. The blast furnace blowing CO of claim 6 2 The application process of the biomass charcoal toughening CO-production carbon emission reduction system is characterized in that 20-30% of blast furnace gas is used for combustion power generation, and the rest of the blast furnace gas is subjected to gas separation to obtain CO 2 And high quality coal gas;
25% -45% of the obtained high-quality coal gas is used for entering a hot blast stove to heat the injected gas, and the rest high-quality coal gas passes through a CO trapping device to obtain CO gas;
said obtained CO 2 50-70% of the totalCO 2 Recycled to CO 2 The gas source is used as the carrier gas and blast gas of the blast furnace coal powder injection, and the rest CO 2 The gas and the total CO gas are used as chemical raw materials.
8. The blast furnace blowing CO of claim 1 2 -application process of biomass charcoal-based steel CO-production carbon emission reduction system, characterized in that the CO is 2 Gas source, O 2 The air source forms combustion-supporting air mixed air to supply air to the combustion-supporting air mixed air device; wherein, CO 2 The proportion of O is 55-70 percent 2 The proportion is 30-45%.
9. The blast furnace blowing CO of claim 8 2 The application process of the biomass charcoal toughening CO-production carbon emission reduction system is characterized in that the combustion-supporting air mixed gas enters the hot blast stove, high-quality coal gas in the hot blast stove reacts with the combustion-supporting air mixed gas for combustion, and generated hot blast stove tail gas enters hot blast stove tail gas CO 2 A trap device for trapping and obtaining CO 2 And then transferred to CO 2 And (4) a gas source.
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