CN203373411U - Moving bed smelting system for cooling and conveying reducing gas prepared by gasifying medium-rank and low-rank coal - Google Patents
Moving bed smelting system for cooling and conveying reducing gas prepared by gasifying medium-rank and low-rank coal Download PDFInfo
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- CN203373411U CN203373411U CN201320287715.0U CN201320287715U CN203373411U CN 203373411 U CN203373411 U CN 203373411U CN 201320287715 U CN201320287715 U CN 201320287715U CN 203373411 U CN203373411 U CN 203373411U
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Abstract
The utility model provides a moving bed smelting system for cooling and conveying reducing gas prepared by gasifying medium-rank and low-rank coal. The smelting system comprises a gasification reactor, a moving-bed reduction reactor, a desulfurization and decarbonization device and a mixed-gas conveying pipeline, wherein the gasification reactor is used for reacting coal, steam and oxygen inside so as to obtain the reducing gas containing carbon monoxide and hydrogen; the moving-bed reduction reactor is used for reacting the reducing gas and mineral pellets inside so as to obtain a reducing product and reducing exhaust gas, and is connected with the gasification reactor; the desulfurization and decarbonization device is used for carrying out desulfurization and decarbonization treatment on the reducing gas and the reducing exhaust gas so as to obtain mixed gas which is purified, and is connected with the gasification reactor and the moving-bed reduction reactor; the mixed-gas conveying pipeline is used for introducing the purified mixed gas into the moving-bed reduction reactor, and is connected with the desulfurization and decarbonization device and the moving-bed reduction reactor respectively. The smelting system provided by the utility model has the advantages that reduction can be effectively carried out on mineral powder, the cost is reduced and the reduction efficiency of the mineral powder also can be obviously improved.
Description
Technical field
The utility model relates to field of metallurgy.Send the moving-bed smelting system in particular to the standby reduction of middle low-rank coal vaporizing system air cooling.
Background technology
China's ore reserve inferior is abundant, whole nation iron ore finds out that resource reserve is 613.35 hundred million tons, wherein basic reserves are 223.64 hundred million tons, 389.71 hundred million tons of stock numbers, China's iron ore finds out that the resource reserve overwhelming majority is for lean ore, rich iron ore finds out that resource reserve has 10.02 hundred million tons, accounts for whole iron ores and finds out 1.6% of resource reserve.On the other hand, the iron ore reserves that China has the living Hubeiwan of companion's (being total to) account for 1/3 of national reserves, and companion's (being total to) gives birth to Hubeiwan to be had: vanadium, titanium, tungsten, molybdenum, cobalt, antimony, gold, cadmium, gallium, uranium, thorium etc. more than 30 are planted rare precious metal.This is the principal feature of China's iron ore deposit.Adopt existing blast-furnace technique to carry out " by force " to complex ore and smelt, cause a large amount of Coexisting Elements reasonably do not utilized and waste, even environmental pollution, for example, in the higher-grade that China is about 4,000,000,000 tons, high-phosphorus iron ore is not utilized.Therefore the comprehensive utilization in ore deposit inferior is a problem that must solve.In addition, along with the high grade iron ore resources is in minimizing day by day in the world, in the import ore deposit, fine ore has reached 80%; The average grade of domestic iron ore only has 33%, and product ore deposit, native land 100% is almost breeze entirely.Will be simultaneously in the face of or adapt to import ore deposit valency and increase that gesture does not subtract, granularity is more and more thinner, domestic a large amount of compound mineral intergrowths can not get the resource situations such as reasonable development, the breeze Direct Reduction Technology is an important channel that successfully manages current China iron ore present situation.
The utility model content
The utility model is intended to one of solve the problems of the technologies described above at least to a certain extent.For this reason, a purpose of the present utility model is to propose a kind of standby reduction of low-rank coal vaporizing system air cooling with advantages such as production efficiency are high, the reducing gas preparation cost is low and send the moving-bed smelting system.
For this reason, aspect one in the utility model, proposed a kind ofly for reducing the system of breeze, this system comprises: for making coal, water vapour and oxygen, react therein, so that the gasifying reactor of the reducing gas that obtains containing carbon monoxide and hydrogen; For described reducing gas is reacted therein with the mineral pelletizing, in order to obtain the moving-bed reduction reactor of reduzate and the weary gas of reduction, described moving-bed reduction reactor is connected with described gasifying reactor; For described reducing gas and the weary gas of reduction are carried out to the desulfurization and decarburization processing, in order to obtain the desulfurization and decarburization device of the mixed gas through purifying, described desulfurization and decarburization device is connected with described moving-bed reduction reactor with described gasifying reactor; And, for the described mixed gas through purification being incorporated into to the mixed gas delivery pipeline of described moving-bed reduction reactor, described mixed gas delivery pipeline is connected with described moving-bed reduction reactor with described desulfurization and decarburization device respectively.Utilize and above-mentionedly can effectively be reduced to breeze for reducing the system of breeze, and can significantly improve the reduction efficiency of breeze.
In addition, can also there is following additional technical characterictic according to the utility model above-described embodiment for reducing the system of breeze:
In the utility model, the gasification temperature in described gasifying reactor is 750～1100 degrees centigrade, and vapor pressure is more than 0.3MPa.Can improve the efficiency that gasifying reactor prepares reducing gas thus, in order to further improve the reduction efficiency of breeze.
In the utility model, described reducing gas contains hydrogen, carbon monoxide, carbonic acid gas, methane, nitrogen, and wherein, the volume percent of each component meets following condition: H
2/ CO>0.5, (H
2+ CO)/(H
2o+CO
2) 10,3%<CH
4<15%, N
2<10%, 1%≤CO
2≤ 3%.Can improve the reduction efficiency of reducing gas thus, in order to further improve the reduction efficiency of breeze.The contriver is surprised to find, and when the reducing gas that adopts this ratio forms, can effectively utilize this reducing gas the mineral pelletizing is reduced to processing.When employing does not meet the reducing gas of this condition, the efficiency that the mineral pelletizing is reduced can significantly descend.
In the utility model, described gasifying reactor is to be selected from least one of fixed bed, fluidized-bed and conveying bed.Can improve thus the efficiency of preparation reducing gas, in order to further improve the reduction efficiency of breeze.The contriver is surprised to find, only has when adopting fixed bed, fluidized-bed and conveying bed, and low-rank coal in just can utilizing, acquisition can be effective to the mineral pelletizing reduce to the reducing gas of processing, and the composition of reducing gas meets following requirement: H
2/ CO>0.5, (H
2+ CO)/(H
2o+CO
2) 10,3%<CH
4<15%, N
2<10%, 1%≤CO
2≤ 3%.When adopting other gasifying reactor, due to the restriction of gasifying reactor itself, in being not suitable for utilizing, low-rank coal obtains the reducing gas that meets above-mentioned condition.Thereby the cost performance of utilizing reducing gas that other gasifying reactors produce to carry out the reduction of mineral pelletizing is far below adopting fixed bed, fluidized-bed and conveying bed.
In the utility model, between described gasifying reactor and described desulfurization and decarburization device, along described gasifying reactor, to described desulfurization and decarburization device direction, set gradually in described reducing gas with before the mineral pelletizing reacts, in advance described reducing gas is carried out to the first cleaning apparatus, the first washing device and the first gas-liquid separation device that dust removal process, carrying out washing treatment and gas-liquid separation are processed.Can improve the purity of reducing gas thus, in order to further improve the reduction efficiency of breeze.
According to embodiment of the present utility model, the reduction temperature in described moving-bed reduction reactor is 750～1150 degrees centigrade, and reduction pressure is not more than 1.0MPa.Can further improve the reduction efficiency of breeze thus.
In the utility model, between described moving-bed reduction reactor and described desulfurization and decarburization device, direction along from described moving-bed reduction reactor to described desulfurization and decarburization device, set gradually for before the weary gas of described reduction is carried out to desulfurization and decarburization, in advance the weary gas of described reduction is carried out to the second cleaning apparatus, heat-exchanger rig, the second washing device, the second gas-liquid separation device and the compression set that dust removal process, heat exchange processing, carrying out washing treatment, gas-liquid separation are processed and resulting gas after gas-liquid separation carried out to processed compressed successively.The reducing gas of not participating in reduction reaction can be purified to rear recycling thus, in order to further improve the utilising efficiency of reducing gas, and then the reduction efficiency of raising breeze.
In the utility model, described heat-exchanger rig is connected with described desulfurization and decarburization device, in order to utilize the part of the described mixed gas through purification to carry out the heat exchange processing to the weary gas of described reduction.Can effectively reduce thus the temperature of the weary gas of reduction, and mixed gas is carried out to preliminary preheating, avoid heat to run off, improve heat utilization efficiency.
In the utility model, be provided with process furnace on described mixed gas delivery pipeline, so that by described through the mixed gas delivery that purifies to before described moving-bed reduction reactor, carry out thermal pretreatment to described through the mixed gas purified in process furnace, wherein, described process furnace adopts the part of the described mixed gas through purification to act as a fuel.Can improve the utilising efficiency of mixed gas thus, and then improve the reduction efficiency of breeze.
In order conveniently to understand said system, below, to utilizing the method that said system is reduced to breeze to be described, the method comprises: coal, water vapour and oxygen are reacted in gasifying reactor, in order to obtain the reducing gas that contains carbon monoxide and hydrogen; Described reducing gas is reacted in the moving-bed reduction reactor, in order to obtain reduzate and the weary gas of reduction with the mineral pelletizing; And the weary gas of described reduction is incorporated in described moving-bed reduction reactor; Wherein, the weary gas of described reduction is incorporated into to described moving-bed reduction reactor and further comprises: in advance by the weary gas of described reduction with carry out the desulfurization and decarburization processing after described reducing gas is mixed, in order to obtain the mixed gas through purifying; Described mixed gas is incorporated in described moving-bed reduction reactor.
During the feed coal that utilizes aforesaid method to prepare reducing gas can adopt, low-rank coal, significantly reduced the preparation cost of reducing gas.In addition, to carry out purifying treatment for the weary gas of reduction reduced after the mineral pelletizing in the method, do not draw and get back in the moving-bed reduction reactor wherein participating in the carbon monoxide of reduction reaction and hydrogen, continue on for reducing the mineral pelletizing, can avoid thus the waste of reducing gas.Therefore, utilize above-mentioned method of going back breeze, reduce the preparation cost of reducing gas, further improve the reduction efficiency of breeze.
In addition, according to the utility model, utilize the method that said system is reduced to breeze can also there is following additional technical characterictic:
In the utility model, described mineral pelletizing is that at least one by being selected from red soil nickel ore, oolitic hematite, antelope stone ore, vanadium titano-magnetite, rhombohedral iron ore, specularite, limonite, spathic iron ore and nonferrous metal oxides slag prepares.Can further improve the reduction efficiency of breeze thus.
In the utility model, the ultimate compression strength of mineral pelletizing >=2000N/ ball, the size distribution of described mineral pelletizing is that the pelletizing that particle diameter is not more than 25mm and is not less than 9mm accounts for more than 90% of pelletizing total mass, and the pelletizing that particle diameter is not more than 5mm accounts for below 3% of pelletizing total mass.Can further improve the reduction efficiency of breeze thus.
In the utility model, described coal is to be selected from least one of brown coal, long-flame coal and sub-bituminous coal.Can reduce thus the cost of preparation reducing gas.
In the utility model, the gasification temperature in described gasifying reactor is 750～1100 degrees centigrade, and vapor pressure is more than 0.3MPa.Can improve thus the efficiency of preparation reducing gas, in order to further improve the efficiency of reduction breeze.
In the utility model, described reducing gas contains hydrogen, carbon monoxide, carbonic acid gas, methane, nitrogen, and wherein, the volume percent of each component meets following condition: H
2/ CO>0.5, (H
2+ CO)/(H
2o+CO
2) 10,3%<CH
4<15%, N
2<10%, 1%≤CO
2≤ 3%.Utilize thus this reducing gas can further improve the reduction efficiency of breeze.The contriver is surprised to find, and when the reducing gas that adopts this ratio forms, can effectively utilize this reducing gas the mineral pelletizing is reduced to processing.When employing does not meet the reducing gas of this condition, the efficiency that the mineral pelletizing is reduced can significantly descend.
In the utility model, described gasifying reactor is to be selected from least one of fixed bed, fluidized-bed and conveying bed.Can improve thus the efficiency of preparation reducing gas, in order to further improve the reduction efficiency of breeze.The contriver is surprised to find, only has when adopting fixed bed, fluidized-bed and conveying bed, and low-rank coal in just can utilizing, acquisition can be effective to the mineral pelletizing reduce to the reducing gas of processing, and the composition of reducing gas meets following requirement: H
2/ CO>0.5, (H
2+ CO)/(H
2o+CO
2) 10,3%<CH
4<15%, N
2<10%, 1%≤CO
2≤ 3%.When adopting other gasifying reactor, due to the restriction of gasifying reactor itself, be not suitable in utilization, low-rank coal obtains the reducing gas that meets above-mentioned condition.Thereby the cost performance of utilizing reducing gas that other gasifying reactors produce to carry out the breeze reduction is far below adopting fixed bed, fluidized-bed and conveying bed.
In the utility model, before reducing gas is carried out to the desulfurization and decarburization processing, in advance described reducing gas is carried out to dust removal process, carrying out washing treatment and gas-liquid separation and process.Can improve the purity of reducing gas thus, in order to further improve the reduction efficiency of breeze.
In the utility model, the reduction temperature in described moving-bed reduction reactor is 750～1150 degrees centigrade, and reduction pressure is for being not more than 1.0MPa.Can further improve the reduction efficiency of breeze thus.
In the utility model, before the weary gas of described reduction is carried out to desulfurization and decarburization, in advance the weary gas of described reduction is carried out to dust removal process, heat exchange processing, carrying out washing treatment and gas-liquid separation successively and process, and carry out described desulfurization and decarburization processing after resulting gas after gas-liquid separation is compressed.The reducing gas of not participating in reduction reaction can be purified to rear recycling thus, in order to further improve the utilising efficiency of reducing gas, and then the reduction efficiency of raising breeze.
In the utility model, utilize the part of the described mixed gas through purification to carry out the heat exchange processing to the weary gas of described reduction.Can improve heat utilization efficiency thus.
In the utility model, before the described mixed gas through purification is introduced to described moving-bed reduction reactor, carry out thermal pretreatment to described through the mixed gas purified in process furnace, wherein, described process furnace adopts the part of the described mixed gas through purification to act as a fuel.Can improve the utilising efficiency of reducing gas thus, and then improve the reduction efficiency of breeze.
Additional aspect of the present utility model and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present utility model.
The accompanying drawing explanation
Above-mentioned and/or additional aspect of the present utility model and advantage are from obviously and easily understanding becoming the description of embodiment in conjunction with following accompanying drawing, wherein:
Fig. 1 be according to an embodiment of the utility model for reducing the structural representation of system of breeze;
Fig. 2 be according to another embodiment of the utility model for reducing the structural representation of system of breeze;
Fig. 3 is according to the method flow schematic diagram that utilizes reduced ore powder system reduction breeze of an embodiment of the utility model;
Fig. 4 be according to another embodiment of the utility model for reducing the structural representation of system of breeze.
Embodiment
Below describe embodiment of the present utility model in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label means same or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.
Aspect one of the present utility model, the utility model proposes a kind ofly for reducing the system 1000 of breeze, this system comprises: gasifying reactor 100, moving-bed reduction reactor 200, desulfurization and decarburization device 300 and mixed gas delivery pipeline 400.As shown in Figure 1.
Wherein, gasifying reactor 100 is for reacting therein coal, water vapour and oxygen, in order to obtain the reducing gas that contains carbon monoxide and hydrogen; Moving-bed reduction reactor 200 is connected with gasifying reactor 100, for making reducing gas, with the mineral pelletizing, at moving-bed reduction reactor 200, reacts, in order to obtain reduzate and the weary gas of reduction; Desulfurization and decarburization device 300 is connected with moving-bed reduction reactor 200 with gasifying reactor 100, reducing gas and the weary gas of reduction is carried out to the desulfurization and decarburization processing, in order to obtain the mixed gas through purifying; Mixed gas delivery pipeline 400 is connected with moving-bed reduction reactor 200 with desulfurization and decarburization device 300 respectively, for being incorporated into moving-bed reduction reactor 200 through the mixed gas purified.Utilize and above-mentionedly can effectively be reduced to breeze for reducing the system of breeze, and can significantly improve the reduction efficiency of breeze.
According to an embodiment of the present utility model, the gasification temperature in gasifying reactor 100 also is not particularly limited, and according to specific embodiment of the utility model, can be 750～1100 degrees centigrade, and vapor pressure can be for more than 0.3MPa.Can improve thus the efficiency of preparation reducing gas, in order to further improve the efficiency of reduction breeze.According to specific embodiment of the utility model, the type of gasifying reactor 100 also is not particularly limited, and according to the concrete example of this law, gasifying reactor 100 can be to be selected from least one of fixed bed, fluidized-bed and conveying bed.The contriver is surprised to find, only has when adopting fixed bed, fluidized-bed and conveying bed, and low-rank coal in just can utilizing, acquisition can be effective to breeze reduce to the reducing gas of processing, and the composition of reducing gas meets following requirement: H
2/ CO>0.5, (H
2+ CO)/(H
2o+CO
2) 10,3%<CH
4<15%, N
2<10%, 1%≤CO
2≤ 3%.When adopting other gasifying reactor, due to the restriction of gasifying reactor itself, in being not suitable for utilizing, low-rank coal obtains the reducing gas that meets above-mentioned condition.Thereby the cost performance of utilizing reducing gas that other gasifying reactors produce to carry out the breeze reduction is far below adopting fixed bed, fluidized-bed and conveying bed.Can improve thus the efficiency of preparation reducing gas, in order to further improve the reduction efficiency of breeze.According to specific embodiment of the utility model, can be by coal, water vapour and oxygen be reacted in gasifying reactor 100 under these conditions, prepare the reducing gas that contains carbon monoxide and hydrogen.
According to another embodiment of the present utility model, the composition of reducing gas also is not particularly limited, and the concrete example according to this law, can contain hydrogen, carbon monoxide, carbonic acid gas, methane, nitrogen in reducing gas, wherein, the volume percent of each component meets following condition: H
2/ CO>0.7, (H
2+ CO)/(H
2o+CO
2) 10,3%<CH
4<15%, N
2<10%, 1%≤CO
2≤ 3%.Utilize thus this reducing gas can further improve the reduction efficiency of breeze.The contriver is surprised to find, and when the reducing gas that adopts this ratio forms, can effectively utilize this reducing gas breeze is reduced to processing.When employing does not meet the reducing gas of this condition, the efficiency that breeze is reduced can significantly descend.
According to another embodiment of the present utility model, as shown in Figure 2, above-mentionedly for reducing the system of breeze, further comprise: between described gasifying reactor 100 and described desulfurization and decarburization device 300, be disposed with the first cleaning apparatus 110, the first washing device 120 and the first gas-liquid separation device 130 along described gasifying reactor 100 to described desulfurization and decarburization device 300 directions, for by reducing gas with before the mineral pelletizing reacts, in advance described reducing gas is carried out to dust removal process, carrying out washing treatment and gas-liquid separation processing.Can improve the purity of reducing gas thus, in order to further improve the reduction efficiency of breeze.According to specific embodiment of the utility model, the first cleaning apparatus 110 can be the gasifying reactor cyclonic separator of at least two series connection, utilize this gasifying reactor cyclonic separator to carry out purifying treatment to the reducing gas prepared in gasifying reactor 100, wherein in each gasifying reactor cyclonic separator, separate obtaining solid impurity and can be back to successively in gasifying reactor 100, continuation can be participated in gasification reaction.Can improve the efficiency of carbon conversion of reducing gas thus, in order to further improve the reduction efficiency of breeze.
According to embodiment of the present utility model, after utilizing reducing gas to reduce to the mineral pelletizing to process, also residual a large amount of reducing gas in the weary gas of the reduction produced, can reduce this part weary gas through after purifying, then return the mineral pelletizing is reduced.Thereby, utilize desulfurization and decarburization device 300 to carry out purifying treatment to reducing weary gas.
According to a specific embodiment of the present utility model, reduction temperature in the reactor of moving-bed reduction reactor 200 also is not particularly limited, according to concrete example of the present utility model, the reduction temperature in reactor can be 750～1150 degrees centigrade, and reduction pressure is for being not more than 1.0MPa.Can further improve the reduction efficiency of breeze thus.
According to another specific embodiment of the present utility model, as shown in Figure 2, between described moving-bed reduction reactor 200 and described desulfurization and decarburization device 300, direction along from described moving-bed reduction reactor 200 to described desulfurization and decarburization device 300, be disposed with the second cleaning apparatus 210, heat-exchanger rig 220, the second washing device 230, the second gas-liquid separation device 240 and compression set 250, so that before the weary gas of described reduction is carried out to desulfurization and decarburization, in advance the weary gas of described reduction is carried out to dust removal process successively, heat exchange is processed, carrying out washing treatment and gas-liquid separation are processed, and after being compressed, resulting gas after gas-liquid separation carries out described desulfurization and decarburization processing.According to another specific embodiment of the present utility model, the second cleaning apparatus 210 can be the weary cyclconic wind separator of the reduction of at least two series connection, according to specific embodiment of the utility model, the weary cyclconic wind separator of reduction that specifically can adopt at least two series connection carries out dedusting to reducing weary gas, wherein separates the unreduced mineral that obtain and is back to successively in the moving-bed reduction reactor and continues to participate in reduction reaction.Can further improve the utilising efficiency of mineral thus.
According to specific embodiment of the utility model, heat-exchanger rig 220 can be interchanger, particularly, by utilizing the weary gas of reduction after the second cleaning apparatus 210 dedustings further to pass into heat-exchanger rig 220, carries out the heat exchange processing.Utilize thus heat-exchanger rig 220 can be effectively to carry out cooling to reducing weary gas, in order to will reduce in weary gas the water vapour liquefaction contained, carry out the gas-liquid separation processing with convenient next step to reducing weary gas, and then can further improve the purification efficiency of the weary gas of reduction.
According to specific embodiment of the utility model, utilize the second washing device 230 to carry out purifying treatment to reducing weary gas, in order to remove the tiny fly ash granule of reduction in weary gas, can further improve thus the purification efficiency of the weary gas of reduction, improve reducing the recycling of weary gas.
According to another specific embodiment of the present utility model, utilize the second gas-liquid separation device 240 water contained in the weary gas of reduction can be separated, carry out the processing of gas-liquid desulfurization and decarburization with convenient next step to reducing weary gas, and then can further improve the purification efficiency of the weary gas of reduction.
According to a specific embodiment of the present utility model, utilize compression set 250 to be compressed the weary gas of the reduction after gas-liquid separation, carry out the desulfurization and decarburization processing with the weary gas of convenient reduction.The reducing gas of not participating in reduction reaction can be purified to rear recycling thus, in order to further improve the utilising efficiency of reducing gas, and then the reduction efficiency of raising breeze.
According to another embodiment of the present utility model, utilize above-mentioned desulfurization and decarburization device 300 together to carry out the desulfurization and decarburization processing to reducing gas and the weary gas of reduction, therefore, the mixed gas after the above-mentioned reducing gas through rough purification and the weary gas of reduction are carried out after the desulfurization and decarburization processing being purified jointly.By mixed gas delivery pipeline 400 by mixed gas delivery in the moving-bed reduction reactor with mineral pelletizing generation reduction reaction.Can further improve thus the purifying treatment to reducing gas and the weary gas of reduction, in order to further improve the reduction efficiency of breeze.
According to an embodiment of the present utility model, heat-exchanger rig 220 is connected with desulfurization and decarburization device 300, so that a part of utilizing the mixed gas through purifying is carried out the heat exchange processing to reducing weary gas.Can effectively reduce thus the temperature of the weary gas of reduction, and the mixed gas after purifying is carried out to preliminary preheating, avoid heat to run off, improve heat utilization efficiency.
According to specific embodiment of the utility model, the mixed gas after processing for heat exchange need to be back to moving-bed reduction reactor 200 after preheating.The temperature that low-temperature mixed gas after can avoiding thus purifying enters the rear reduction moving-bed of moving-bed reduction reactor 200 reduction reactor, cause reduction efficiency to reduce.And then the reduction efficiency of raising breeze.
According to another embodiment of the present utility model, be provided with process furnace 410 on mixed gas delivery pipeline 400, so that before will introducing moving-bed reduction reactor 200 through the mixed gas purified, in process furnace 410, the mixed gas through purifying is carried out to thermal pretreatment, wherein, described process furnace 410 adopts the part of the mixed gas through purifying to act as a fuel.And remaining can first pass into heat-exchanger rig for to reducing weary gas, carrying out after the heat exchange processing passing into process furnace 410 again and carry out introducing moving-bed reduction reactor 200 after preheating through the mixed gas purified.Low-temperature mixed gas after can avoiding thus purifying reduces the temperature in moving-bed reduction reactor 200, can improve thus reducing the purification efficiency of weary gas, in order to further improve the utilising efficiency of reducing gas, and then the reduction efficiency of raising breeze.
According to specific embodiment of the utility model, the part of mixed gas directly can be introduced into to the bottom of moving-bed reduction reactor, for reduzate is lowered the temperature, can reach thus the properly distributed utilization to mixed gas.Improve the reduction efficiency of breeze.
For convenient, understand, below with reference to Fig. 3 to utilizing the method that said system is reduced to breeze to be described in detail.
S100: preparation reducing gas
According to an embodiment of the present utility model, at first the breeze method of reducing comprises coal, water vapour and oxygen is reacted in gasifying reactor, obtains the reducing gas that contains carbon monoxide and hydrogen.Can prepare reducing gas thus.
According to another embodiment of the present utility model, for the preparation of the type of the coal of reducing gas and be not particularly limited, according to specific embodiment of the utility model, coal can in being selected from, low-rank coal, for example can be selected from least one of brown coal, long-flame coal and sub-bituminous coal.Can reduce thus the cost of preparation reducing gas.The energy characteristic distributions of China is " oil starvation, weak breath, rich coal ", therefore traditional processing method has been not suitable for the national conditions of China, the coal reserves of China occupies third place in the world, output ranks first in the world, the low-rank coal reserves occupy more than 40% of coal resources total reserves, annual production at present accounts for 30% left and right of national coal weight, therefore, in expansion, the exploitation of low-rank coal not only can rational Application China coal resource, simultaneously, in utilization, low-rank coal prepares reducing gas and can significantly save cost, improves resource utilization.
According to an embodiment of the present utility model, the gasification temperature in the gasifying reactor in the breeze method of reducing also is not particularly limited, and according to specific embodiment of the utility model, can be 750～1100 degrees centigrade, and vapor pressure can be for more than 0.3MPa.Can improve thus the efficiency of preparation reducing gas, in order to further improve the efficiency of reduction breeze.According to specific embodiment of the utility model, the type of gasifying reactor also is not particularly limited, according to the concrete example of this law, gasifying reactor can be to be selected from least one of fixed bed gasification reactor, fluidized bed gasification reactor and conveying bed gasifying reactor.Can improve thus the efficiency of preparation reducing gas, in order to further improve the reduction efficiency of breeze.According to specific embodiment of the utility model, can be by coal, water vapour and oxygen be reacted in gasifying reactor under these conditions, prepare the reducing gas that contains carbon monoxide and hydrogen.
According to another embodiment of the present utility model, the composition of reducing gas also is not particularly limited, and according to concrete example of the present utility model, in reducing gas, can contain hydrogen, carbon monoxide, carbonic acid gas, methane, nitrogen, wherein, the volume percent of each component meets following condition: H
2/ CO>0.5, (H
2+ CO)/(H
2o+CO
2) 10,3%<CH
4<15%, N
2<10%, 1%≤CO
2≤ 3%.Utilize thus this reducing gas can further improve the reduction efficiency of breeze.The contriver is surprised to find, and when the reducing gas that adopts this ratio forms, can effectively utilize this reducing gas breeze is reduced to processing.When employing does not meet the reducing gas of this condition, the efficiency that breeze is reduced can significantly descend.
Particularly, can add by control the ratio of coal, water vapour and oxygen, and concrete reduction reactor and its processing parameter control the above-mentioned reducing gas obtained, in order to improve the reduction efficiency of reducing gas to breeze.Thus, breeze method of reducing according to the utility model embodiment, in can selecting, low-rank coal is as raw material, the water vapour added by control and the ratio of oxygen and concrete suitable reduction reactor processing parameter, can prepare high-quality reducing gas equally.Thus can the cost-effective efficiency that simultaneously improves the preparation reducing gas.
According to an embodiment of the present utility model, before the reducing gas by above-mentioned preparation passes into the moving-bed reduction reactor, in advance reducing gas is carried out to the desulfurization and decarburization processing, in order to further improve the purity of reducing gas, improve the reaction efficiency of reducing gas and mineral pelletizing.According to specific embodiment of the utility model, before reducing gas is carried out to the desulfurization and decarburization processing, can also carry out dust removal process, carrying out washing treatment and gas-liquid separation to reducing gas in advance and process.Can further remove the solid impurities such as flying dust in reducing gas thus, can further improve thus the purity of reducing gas, in order to further improve the reduction efficiency of breeze.According to concrete example of the present utility model, above-mentioned dust removal process, carrying out washing treatment and gas-liquid separation are processed and can be undertaken by gasifying reactor cyclonic separator, washing device and gas-liquid separation device, can effectively to reducing gas, carry out purifying thus.
According to specific embodiment of the utility model, reducing gas is carried out to dust removal process, can utilize the gasifying reactor cyclonic separator of at least two series connection to carry out purifying treatment to the reducing gas prepared in gasifying reactor, wherein in each gasifying reactor cyclonic separator, separate obtaining solid impurity and can be back to successively in gasifying reactor, continuation can be participated in gasification reaction.Can improve the efficiency of carbon conversion of reducing gas thus, in order to further improve the reduction efficiency of breeze.
S200: reduction breeze
According to an embodiment of the present utility model, the method for reduction breeze further comprises, the reducing gas of above-mentioned preparation is reacted in the moving-bed reduction reactor with the mineral pelletizing, in order to obtain reduzate and the weary gas of reduction; And will reduce weary gas and be incorporated in the moving-bed reduction reactor.
According to specific embodiment of the utility model, for the breeze of reduction, can be to be selected from least one of red soil nickel ore, oolitic hematite, antelope stone ore, vanadium titano-magnetite, rhombohedral iron ore, specularite, limonite, spathic iron ore and nonferrous metal oxides slag.Above-mentioned breeze complicated component is difficult, utilizes the method for reducing of the utility model breeze, can effectively to above-mentioned breeze, be reduced, and further improves the reduction efficiency of breeze.
According to another embodiment of the present utility model, after being prepared into to the mineral pelletizing, above-mentioned breeze carries out reduction reaction, the ultimate compression strength of mineral pelletizing also is not particularly limited, according to specific embodiment of the utility model, the ultimate compression strength of mineral pelletizing >=2000N/ ball, the size distribution of described mineral pelletizing is that the pelletizing that particle diameter is not more than 25mm and is not less than 9mm accounts for more than 90% of pelletizing total mass, and the pelletizing that particle diameter is not more than 5mm accounts for below 3% of pelletizing total mass.Can improve the specific surface of mineral pelletizing thus, in order to enlarge the contact area of mineral pelletizing and reducing gas, further improve the reduction efficiency of breeze.
According to another embodiment of the present utility model, for reducing reduction temperature in the reactor of moving-bed reduction reactor of mineral pelletizing being not particularly limited, according to specific embodiment of the utility model, reduction temperature in reactor can be 750～1150 degrees centigrade, and reduction pressure is for being not more than 1.0MPa.Thus can be when saving the energy work-ing life of extension device, and can further improve the reduction efficiency of breeze.
S300: purify the weary gas of reduction
According to an embodiment of the present utility model, before the weary gas of described reduction is incorporated into to the moving-bed reduction reactor, to reducing weary gas, carry out the desulfurization and decarburization processing, can carry out purifying to reducing weary gas thus, in order to improve the rate of utilization to reducing gas, and then improve the efficiency of reducing gas to breeze.According to specific embodiment of the utility model, aforesaid method further comprises: to reducing before weary gas carries out desulfurization and decarburization, carry out successively dust removal process, heat exchange processing, carrying out washing treatment and gas-liquid separation and process reducing weary gas in advance.The reducing gas of not participating in reduction reaction can be purified to rear recycling thus, in order to further improve the utilising efficiency of reducing gas, and then the reduction efficiency of raising breeze.
According to specific embodiment of the utility model, dust removal process can be carried out dedusting to reducing weary gas by reducing weary cyclconic wind separator, the weary cyclconic wind separator of reduction that specifically can adopt at least two series connection carries out dedusting to reducing weary gas, wherein separates the unreduced mineral that obtain and is back to successively in the moving-bed reduction reactor and continues to participate in reduction reaction.Can further improve the utilising efficiency of mineral thus.
According to specific embodiment of the utility model, the weary gas of reduction after dust removal process further carries out the heat exchange processing, heat exchange is processed and can be adopted interchanger to carry out, and particularly, can adopt the mixed gas of processing through desulfurization and decarburization to carry out the heat exchange processing to the weary gas of the reduction after dust removal process.Can effectively reduce thus the temperature of the weary gas of reduction, and the mixed gas after purifying is carried out to preliminary preheating, avoid heat to run off, improve heat utilization efficiency.According to specific embodiment of the utility model, further the weary gas of reduction after heat exchange is processed is carried out to carrying out washing treatment and gas-liquid separation processing, can further improve thus the purity of the weary gas of reduction, the weary gas of reduction after purifying can be back in the moving-bed reduction reactor and participate in reduction reaction thus, can improve the utilization ratio of reducing gas thus, avoid the wasting of resources.
According to another specific embodiment of the present utility model, gas-liquid separation is processed and can be undertaken by gas-liquid separator, the water contained in the weary gas of reduction can be separated thus, carry out the processing of gas-liquid desulfurization and decarburization with convenient next step to reducing weary gas, and then can further improve the purification efficiency of the weary gas of reduction.
According to a specific embodiment of the present utility model, after being compressed, resulting gas after gas-liquid separation carries out the desulfurization and decarburization processing.The reducing gas of not participating in reduction reaction can be purified to rear recycling thus, in order to further improve the utilising efficiency of reducing gas, and then the reduction efficiency of raising breeze.
According to another embodiment of the present utility model, above-mentioned reducing gas and the weary gas of reduction can together carry out the desulfurization and decarburization processing, in aforesaid method, can adopt thus same desulfurization and decarburization device jointly to carry out the desulfurization and decarburization processing to reducing gas and the weary gas of reduction, can further improve thus the desulfurization and decarburization efficiency to reducing gas and the weary gas of reduction.
S400: reducing gas and the weary gas of reduction are introduced in the moving-bed reduction reactor
According to an embodiment of the present utility model, the mixed gas after reducing gas and the weary gas of reduction are carried out after the desulfurization and decarburization processing being purified jointly.According to specific embodiment of the utility model, the mixed gas after above-mentioned purification can divide three tunnels to be processed.Wherein utilize the first via to carry out the heat exchange processing through the part of the mixed gas that purifies to reducing weary gas, can improve heat utilization efficiency thus, and the mixed gas of low temperature is carried out to preliminary preheating.According to specific embodiment of the utility model, the mixed gas after processing for heat exchange need to be through being back to the moving-bed reduction reactor after preheating again.Reduce the temperature in the moving-bed reduction reactor after can avoiding thus entering the moving-bed reduction reactor for low-temperature mixed gas, cause reduction efficiency to reduce.
The second road mixed gas is passed into to process furnace, and the use that acts as a fuel, provide heat, for the first via is back to moving-bed reduction reactor mixed gas before, carries out preheating.
Third Road is the mixed gas of remainder directly to be introduced into to the bottom of moving-bed reduction reactor, for reduzate is lowered the temperature.
The advantage of the breeze method of reducing of the utility model embodiment:
1, adopt the gasifying reactor low-rank coal such as brown coal, long-flame coal, sub-bituminous coal that can gasify, be applicable to the resource general layout of the few oily deficency of the rich coal of China, reduce the preparation cost of reducing gas;
2, the weary gas of gasification gas and reduction shares a set of compressor and desulfurization and decarburization device, and facility investment is few;
3, contain certain methane gas in reducing gas, met the carburizing requirement of subsequent technique;
4, can realize the direct-reduction of the low-grade complexes such as red soil nickel ore, oolitic hematite, antelope stone ore, vanadium titano-magnetite, rhombohedral iron ore, specularite, limonite, spathic iron ore and refractory ore and nonferrous metal oxides slag etc.;
In addition, term " first ", " second " be only for describing purpose, and can not be interpreted as indication or hint relative importance or the implicit quantity that indicates indicated technical characterictic.Thus, one or more these features can be expressed or impliedly be comprised to the feature that is limited with " first ", " second ".In description of the present utility model, the implication of " a plurality of " is two or more, unless otherwise expressly limited specifically.
In the utility model, unless otherwise clearly defined and limited, broad understanding should be done in the terms such as term " installation ", " being connected ", " connection ", " fixing ", for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be also to be electrically connected to; Can be directly to be connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term in the utility model.
Embodiment
Gasifying reactor primary cyclone as shown in Figure 4,1, gasifying reactor, 2; 3, gasifying reactor secondary cyclone; 4, washer; 5, gas-liquid separator; 6, desulfurization and decarburization device; 7 process furnace; 8, moving-bed reduction reactor; 9, reduce weary cyclconic wind separator; 10, interchanger; 11, reduce weary gas washing device; 12, reduce weary gas gas-liquid separator; 13, compressor.
With vanadium titano-magnetite treatment capacity 50 * 10
4the industrial scale of t/h is example, the brown coal coal dust enters fluidized bed gasification reactor 1, under 900 degrees centigrade and 1.0MPa pressure, with the gasifying medium generating gasification of water vapor and oxygen, react, the coal gas of high temperature produced is removed flying dust through gasifying reactor primary cyclone 2 and gasifying reactor secondary cyclone 3, and then enter after washer 4 washing and gas-liquid separator 5 realize gas-liquid separation, clean coal gas is with after the gas from compressor 13 mixes, enter together desulfurization and decarburization device 6 and carry out desulfurization and decarburization, desulfurization and decarburization device 6 gas out is divided into three tunnels: first via gas is first in interchanger 10 and the weary gas heat exchange of reduction through reducing after weary cyclconic wind separator 9 dedustings, enter again process furnace 7 heating, entering afterwards moving-bed reduction reactor 8 uses as reducing medium, the second road gas enters process furnace 7 use that acts as a fuel, Third Road gas is entered in moving-bed reduction reactor 8 by moving-bed reduction reactor 8 bottoms, as cooling gas, uses.
The vanadium titano-magnetite acid pellet enters by moving-bed reduction reactor 8 tops reducing gas that moving-bed reduction reactor 8 enters with moving-bed reduction reactor 8 bottoms and under 900 degrees centigrade and 0.8MPa pressure, reduction occurs and react, and wherein reducing gas should meet: H
2/ CO=1.0, (H
2+ CO)/(H
2o+CO
2)=15, CH
4=5%, N
2=8%, CO
2content 2%, reduzate is discharged by moving-bed reduction reactor 8 bottoms after gas cooling, and metal recovery rate reaches 91%,
The weary gas of the reduction of moving-bed reduction reactor 8 is through reducing after weary cyclconic wind separator 9 dedustings, enter interchanger 10 and carry out heat exchange with the road gas from decarbonization desulfurization system 6, again through 11 washings of the weary gas washing device of reduction with reduce weary gas gas-liquid separator 12 except liquid, be mixed and enter desulfurization and decarburization device 6 and carry out desulfurization and decarburization with coal gas from gas-liquid separator 5 after compressed machine 13 superchargings afterwards.
In the description of this specification sheets, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present utility model or example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiment or example.
Although the above has illustrated and has described embodiment of the present utility model, be understandable that, above-described embodiment is exemplary, can not be interpreted as restriction of the present utility model, those of ordinary skill in the art is not in the situation that break away from principle of the present utility model and aim can be changed above-described embodiment in scope of the present utility model, modification, replacement and modification.
Claims (6)
1. the moving-bed smelting system is sent in the standby reduction of low-rank coal vaporizing system air cooling in one kind, it is characterized in that, comprising:
For coal, water vapour and oxygen are reacted therein, so that the gasifying reactor of the reducing gas that obtains containing carbon monoxide and hydrogen;
For described reducing gas is reacted therein with the mineral pelletizing, in order to obtain the moving-bed reduction reactor of reduzate and the weary gas of reduction, described moving-bed reduction reactor is connected with described gasifying reactor;
For described reducing gas and the weary gas of reduction are carried out to the desulfurization and decarburization processing, in order to obtain the desulfurization and decarburization device of the mixed gas through purifying, described desulfurization and decarburization device is connected with described moving-bed reduction reactor with described gasifying reactor; And
For the described mixed gas through purification being incorporated into to the mixed gas delivery pipeline of described moving-bed reduction reactor, described mixed gas delivery pipeline is connected with described moving-bed reduction reactor with described desulfurization and decarburization device respectively.
According to claim 1 in the standby reduction of low-rank coal vaporizing system air cooling send the moving-bed smelting system, it is characterized in that, described gasifying reactor is to be selected from least one of fixed bed, fluidized-bed and conveying bed.
3. the moving-bed smelting system is sent in the standby reduction of middle low-rank coal vaporizing system air cooling according to claim 1, it is characterized in that, further comprises:
Between described gasifying reactor and described desulfurization and decarburization device, along described gasifying reactor, to described desulfurization and decarburization device direction, set gradually in described reducing gas with before the mineral pelletizing reacts, in advance described reducing gas is carried out to the first cleaning apparatus, the first washing device and the first gas-liquid separation device that dust removal process, carrying out washing treatment and gas-liquid separation are processed.
4. the moving-bed smelting system is sent in the standby reduction of middle low-rank coal vaporizing system air cooling according to claim 1, it is characterized in that, further comprises:
Between described moving-bed reduction reactor and described desulfurization and decarburization device, direction along from described moving-bed reduction reactor to described desulfurization and decarburization device, set gradually for before the weary gas of described reduction is carried out to desulfurization and decarburization, in advance the weary gas of described reduction is carried out to the second cleaning apparatus, heat-exchanger rig, the second washing device, the second gas-liquid separation device and the compression set that dust removal process, heat exchange processing, carrying out washing treatment, gas-liquid separation are processed and resulting gas after gas-liquid separation carried out to processed compressed successively.
5. the moving-bed smelting system is sent in the standby reduction of middle low-rank coal vaporizing system air cooling according to claim 4, it is characterized in that, described heat-exchanger rig is connected with described desulfurization and decarburization device.
6. the moving-bed smelting system is sent in the standby reduction of middle low-rank coal vaporizing system air cooling according to claim 1, it is characterized in that, on described mixed gas delivery pipeline, be provided with by described through the mixed gas delivery that purifies to before described moving-bed reduction reactor, to the described process furnace that carries out thermal pretreatment through the mixed gas purified, described process furnace adopts the part of the described mixed gas through purification to act as a fuel.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320287715.0U CN203373411U (en) | 2013-05-23 | 2013-05-23 | Moving bed smelting system for cooling and conveying reducing gas prepared by gasifying medium-rank and low-rank coal |
| PCT/CN2014/078065 WO2014187329A1 (en) | 2013-05-23 | 2014-05-21 | New process and system for cold conveying mobile bed smelting of reducing gas prepared by using medium/low-rank coal gasification |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320287715.0U CN203373411U (en) | 2013-05-23 | 2013-05-23 | Moving bed smelting system for cooling and conveying reducing gas prepared by gasifying medium-rank and low-rank coal |
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| Publication Number | Publication Date |
|---|---|
| CN203373411U true CN203373411U (en) | 2014-01-01 |
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| CN201320287715.0U Expired - Fee Related CN203373411U (en) | 2013-05-23 | 2013-05-23 | Moving bed smelting system for cooling and conveying reducing gas prepared by gasifying medium-rank and low-rank coal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014187329A1 (en) * | 2013-05-23 | 2014-11-27 | 北京神雾环境能源科技集团股份有限公司 | New process and system for cold conveying mobile bed smelting of reducing gas prepared by using medium/low-rank coal gasification |
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2013
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014187329A1 (en) * | 2013-05-23 | 2014-11-27 | 北京神雾环境能源科技集团股份有限公司 | New process and system for cold conveying mobile bed smelting of reducing gas prepared by using medium/low-rank coal gasification |
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Address after: 102200 Beijing city Changping District Machi Town cow Road No. 18 Patentee after: Shenwu Technology Group Co.,Ltd. Address before: 102200 Beijing city Changping District Machi Town cow Road No. 18 Patentee before: BEIJING SHENWU ENVIRONMENT AND ENERGY TECHNOLOGY Co.,Ltd. |
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Denomination of utility model: The moving-bed smelting system is sent in the standby reduction of middle low-rank coal vaporizing system air cooling Effective date of registration: 20180322 Granted publication date: 20140101 Pledgee: The Bank of Beijing Limited by Share Ltd. Anwar Road Branch Pledgor: Shenwu Technology Group Co.,Ltd. Registration number: 2018990000210 |
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