CN212482087U - Flash circulating smelting system capable of self-exchanging heat and reforming coal gas - Google Patents
Flash circulating smelting system capable of self-exchanging heat and reforming coal gas Download PDFInfo
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- CN212482087U CN212482087U CN202021032409.9U CN202021032409U CN212482087U CN 212482087 U CN212482087 U CN 212482087U CN 202021032409 U CN202021032409 U CN 202021032409U CN 212482087 U CN212482087 U CN 212482087U
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Abstract
The utility model provides a flash cycle smelting system capable of self-exchanging heat and reforming coal gas, which comprises a flash metallurgical device, a coarse dust removal device, a heat medium flow passage of the heat exchange device, a dust removal component, a gas storage pressure regulating device, a cold medium flow passage of the heat exchange device and a coal gas reforming device which are communicated through pipelines, wherein a reducing coal gas outlet of the coal gas reforming device is connected with a reducing gas inlet of the flash metallurgical device through a pipeline; a desulfurization device and a fan are also arranged on the gas main pipeline, and the desulfurization device and the fan are positioned between the dust removal component and the gas storage pressure regulating device; the device also comprises a first gas diversion pipeline, wherein the inlet end of the first gas diversion pipeline is connected with the gas storage pressure regulating device, and the outlet end of the first gas diversion pipeline is connected with a pipeline of a main gas pipeline between the flash metallurgy device and the coarse dust removal device. The flash circulating smelting system of self-heat-exchange and reformed gas makes the discharged gas of the flash smelting process obtain reasonable utilization, and the comprehensive energy consumption of the system is low and the carbon emission is small.
Description
Technical Field
The utility model belongs to flash smelting technology tapping flue gas treatment field especially relates to a flash circulation system of smelting from heat transfer and reforming gas.
Background
Flash metallurgy is traditionally only applied to smelting metal sulfide ores, and is being widely applied to smelting metal oxide ores such as iron ores, laterite-nickel ores and the like.
The basic principle of flash smelting of oxidized ore is to introduce high-temperature high-concentration reducing gas (mainly containing CO and H2) into a space specially used for reducing metal oxidized ore, so as to realize gas-phase reduction of metal oxide in the high-temperature space, and the product of space smelting falls into a molten pool, and the residual metal oxide is reduced by carbon fixation in the molten pool. Since metal oxide ores generally contain FeO, a space is required for the effective component (CO + H) of the reducing gas to efficiently reduce FeO2) The concentration of (2) is relatively high, i.e. the excess coefficient is high, which results in a low proportion of reducing gas consumed by the reduction reaction, i.e. the tapping flue gas contains a large amount of reducing gas.
The discharged flue gas of the flash metallurgical equipment for the oxidized ore is mainly derived from gas generated after reduction reaction in a reduction space, and is also partially derived from CO and CO generated after reduction of carbon in a molten pool2Because the smelting adopts high oxygen enrichment or pure oxygen, the main components of the discharged flue gas are CO and CO2、H2、H2O, the conventional tail gas treatment method is to burn off CO and H in the tail gas2The waste heat power generation is carried out, and the burnt flue gas is discharged after dust removal and desulfurization, and the treatment method has the defects that the energy conversion efficiency of waste heat utilization is low, and a large amount of effective reducing gas (CO + H) in tail gas2) Burnt and needs to regenerate gas at a large cost at the raw material end; and the resulting carbon emissions may be greater than conventional smelting processes.
In conclusion, the prior flash smelting process for the oxidized ore cannot reasonably utilize the discharged coal gas, so that the overall energy consumption of the whole process is high and the carbon emission is large.
Disclosure of Invention
In view of this, the utility model aims at providing a flash circulation system of self-heat transfer and reforming gas to solve the problem that the discharge tail gas of flash metallurgical equipment smelting oxide ore does not obtain reasonable recycle, carbon emission is big.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
a flash circulating smelting system capable of self-exchanging heat and reforming coal gas comprises a coal gas main pipeline, wherein the coal gas main pipeline comprises flash metallurgical equipment, coarse dust removal equipment, a heat medium flow channel of the heat exchange equipment, a dust removal assembly, gas storage and pressure regulation equipment, a cold medium flow channel of the heat exchange equipment and coal gas reforming equipment which are communicated through pipelines, and a reducing coal gas outlet of the coal gas reforming equipment is connected with a reducing gas inlet of the flash metallurgical equipment through a pipeline; a desulfurization device and a fan are also arranged on the gas main pipeline, and the desulfurization device and the fan are positioned between the dust removal component and the gas storage pressure regulating device; the device is characterized by further comprising a first gas diversion pipeline, wherein the inlet end of the first gas diversion pipeline is connected with the gas storage pressure regulating device, and the outlet end of the first gas diversion pipeline is connected with a pipeline of a gas main pipeline between the flash metallurgy device and the coarse dust removal device.
It should be noted that: the common construction schemes of the main gas pipeline include the following two types:
1) the device comprises a flash metallurgy device tail gas outlet, a coarse dust removal device, a heat medium channel of a heat exchange device, a dust removal component, a fan, a desulfurization device, a gas storage pressure regulating device, a cold medium channel of the heat exchange device, a gas reforming device and a reducing gas inlet of the flash metallurgy device which are sequentially communicated through pipelines.
2) The device comprises a flash metallurgy device tail gas outlet, a coarse dust removal device, a heat medium channel of a heat exchange device, a dust removal component, a desulfurization device, a fan, a gas storage pressure regulating device, a cold medium channel of the heat exchange device, a coal gas reforming device and a reducing gas inlet of the flash metallurgy device which are sequentially communicated through pipelines.
The flash metallurgical equipment is all metallurgical equipment constructed by adopting the flash metallurgical principle.
The coarse dust removing equipment is dust removing facility or equipment capable of normally working at the high temperature of 800-900 ℃ and is used for removing large-particle smoke dust in the smoke and preventing the pipeline from being blocked.
The heat exchange equipment can recover the heat in the high-temperature tail gas and is used for heating the cold coal gas output by the gas storage pressure regulating equipment, so that the cold coal gas is heated to a certain temperature and enters the coal gas reforming equipment. The heat exchange equipment is preferably a plate heat exchanger.
The dust removal component is used for removing most of smoke dust in the smoke. If the dust removal component adopts wet dust removal equipment, because the smoke dust contains a large amount of flux CaO, the CaO can form alkaline solution when dissolved in the dust removal water, and can absorb acid gas in the smoke gas, and therefore, some wet dust removal equipment also has certain desulfurization effect.
The desulfurization method adopted by the desulfurization equipment is one of dry desulfurization, wet desulfurization and semi-dry desulfurization, wherein the wet desulfurization comprises ammonia washing neutralization, improved ADA (ammonia-induced oxidation) method, MSQ (minimum shift keying) method, KCS (potassium chloride) method, tannin extract method and other desulfurization technologies, and preferably tannin extract method desulfurization. It should be noted that: if the wet desulphurization equipment is adopted, a gas-water separation device such as an electrified demisting device is generally arranged at the flue gas outlet end, and if the wet desulphurization equipment does not comprise a dehydration device, a dehydration device is additionally arranged at the rear end of the desulphurization equipment, and the dehydration device is regarded as a component of the desulphurization equipment.
In practical application, the dust removal component and the desulfurization equipment can be integrated into a whole, namely, the same equipment can remove dust and play a role in desulfurization, and the equipment comprises but is not limited to a water film desulfurization dust remover, an impact water bath desulfurization dust remover and a dynamic wave scrubber.
The fan is used for exhausting air, overcoming the system resistance of flue gas transmission and providing power for flue gas flowing, so that a micro-negative-pressure smelting environment is formed inside the flash smelting equipment. It should be noted that, along the flowing direction of the flue gas on the main gas pipeline, the fan may be disposed in front of the desulfurization device or behind the desulfurization device.
The gas storage and pressure regulation device is mainly used for storing gas and serving as a gas buffer device, so that a flue gas system has elasticity. The gas storage temperature of the gas storage and pressure regulation equipment is usually about 0-70 ℃. The output end of the gas storage pressure regulating device can be provided with a pressure regulating device, such as a booster fan and the like, and the pressure of the output gas is regulated, so that the gas can be conveyed to subsequent equipment at proper air pressure, and the gas pressure finally input into the flash metallurgical equipment is influenced; of course, before the coal gas enters the gas storage and pressure regulation equipment, the coal gas may also need to be regulated to a proper pressure through the pressure regulation device so as to be stored in the gas storage and pressure regulation equipment. In addition, when the temperature of the coal gas exceeds the storage temperature range of the gas storage pressure regulating equipment, the temperature of the coal gas needs to be reduced through a cooling device (such as a heat exchanger, a condenser and the like). It should be noted that: the pressure regulating device arranged at the input or output end of the gas storage and pressure regulating equipment is regarded as a part of the gas storage and pressure regulating equipment; if the temperature of the coal gas needs to be reduced so as to be stored in the gas storage and pressure regulating equipment, the attached cooling device is also regarded as a part of the gas storage and pressure regulating equipment.
The coal gas reforming equipment has the function of reforming most of CO in coal gas2Converting into CO to make CO in coal gas2The volume concentration of (a) is reduced to less than 5%. The gas reforming temperature of the gas reforming plant needs to reach over 900 c and therefore fuel combustion needs to be introduced to heat the gas reforming unit. The fuel sources of the gas reforming equipment are various, such as coal, natural gas, heavy oil and the like, and combustible gas of other gas systems can also be introduced. It is noted that the gas reforming equipment is provided with a gas inlet to be reformed and a reducing gas outlet which are mutually communicated, and is also provided with a combustion improver inlet and a fuel gas inlet which are mutually communicatedThe port and the tail gas outlet, and the two sets of pipeline systems are mutually isolated and not communicated.
The first gas shunt pipeline is connected with the gas storage pressure regulating device and the intersection of the first gas shunt pipeline and the gas storage pressure regulating device through valves, wherein the intersection of the inlet end of the first gas shunt pipeline and the gas storage pressure regulating device is connected through a valve with flow control, the proportion of returned cold gas is regulated and controlled through the valve, and therefore the temperature of the flue gas entering the coarse dust removal device is controlled, and the dust content of the flue gas is reduced. In addition, a pressurizing device is usually arranged on the first gas branch pipeline to provide power for the returned cool gas.
Furthermore, preheating equipment is arranged on pipelines at the outlet end of the cold medium flow channel of the heat exchange equipment and the inlet end of the gas to be reformed of the gas reforming equipment, and the preheating equipment preheats the gas to be reformed flowing out of the cold medium flow channel of the heat exchange equipment; and the tail gas outlet end of the coal gas reforming device is connected with the preheating device, and the preheating device takes high-temperature tail gas discharged by fuel combustion of the coal gas reforming device as a heat source.
Further, the coal gas separator also comprises a second coal gas shunt pipeline; the inlet end of the second gas shunt pipeline is connected with the gas storage pressure regulating device, and the outlet end of the second gas shunt pipeline is connected with the fuel inlet end of the gas reforming device after penetrating through the preheating device.
The inlet end of the second gas shunt pipeline is connected with the gas storage pressure regulating equipment through a valve with flow control. The valve may control the amount of gas distributed into the second gas diversion line.
The gas preheating device comprises a gas reforming device, a gas supply pipeline and a combustion improver gas supply pipeline, wherein the gas supply pipeline comprises a combustion improver gas supply device and a combustion improver gas flow passage of the preheating device which are sequentially communicated through a pipeline, and the outlet end of the combustion improver gas flow passage of the preheating device is communicated with the combustion improver gas inlet end of the gas reforming device through a pipeline.
The preheating device fully utilizes the waste heat of the high-temperature flue gas exhausted by the coal gas reforming device, and is a device for improving the heat exchange performance of the coal gas reforming device and reducing the energy consumption. The preheating equipment is generally divided into three types, namely plate type, rotary type and tubular type. The gas to be reformed provided by the main pipeline or/and the gas as fuel provided by the second gas branch pipeline or/and the oxygen-containing gas provided by the combustion improver gas supply pipeline are preheated by the preheating device, so that the gas to be reformed and/or the gas as fuel provided by the second gas branch pipeline or/and the oxygen-containing gas provided by the combustion improver gas supply pipeline are raised to a certain temperature and then enter the gas reforming device. It should be noted that: the oxygen-containing gas is one of air, oxygen-enriched air or pure oxygen, preferably air, and is blown in by a blower.
The coal gas provided by the second coal gas shunt pipeline is used as fuel, the oxygen-containing gas blown in by the blower is used as combustion improver, the coal gas reforming equipment is combusted and heated, and a proper temperature environment and heat are provided for reforming reaction.
Furthermore, a valve interface which can be connected with an external gas system is arranged on the gas storage pressure regulating device.
When the valve is opened, gas can be output to other gas systems through the interface; when the fuel is insufficient, the gas input by other gas systems can be received through the interface; under the abnormal conditions of gas system failure and the like, the interface can be communicated with the diffusion system for emergency treatment.
The coal gas desulfurization device is characterized by further comprising mineral powder drying equipment, wherein the mineral powder drying equipment is arranged on the coal gas main pipeline and is positioned between the dust removal component and the desulfurization equipment.
The mineral powder drying equipment utilizes the waste heat of the tail gas of the flash metallurgy equipment to dry the metal oxide mineral powder to be smelted, so that the water content of the mineral powder is lower than 0.3 percent. The mineral powder drying equipment is similar to a dividing wall type heat exchanger, smoke and powder are respectively provided with respective flow passages, are not in direct contact with each other, move reversely, and exchange heat through a heat conducting wall surface. Mineral powder drying equipment includes but is not limited to: fluidized type drying machines, vertical drying machines, rotary drying machines and suspension drying machines.
The coal gas dehydration device is arranged on the coal gas main pipeline and is positioned between the desulfurization device and the gas storage pressure regulating device.
The coal gas dehydration equipment is one or a combination of a plurality of cooling dehydration equipment, absorption dehydration equipment, adsorption dehydration equipment and membrane separation technology dehydration equipment, and preferably the absorption dehydration equipment takes triethylene glycol (TEG) as a dehydrating agent.
The tail gas discharged by smelting of flash metallurgical equipment contains a certain proportion of water vapor, and if the tail gas is subjected to wet dust removal or wet desulphurization, the coal gas not only contains saturated water vapor, but also carries a certain amount of small liquid drops, so that the equipment in the subsequent process is protected from being corroded, and meanwhile, the effective reducing gas (CO + H) in the coal gas is improved2) And thus gas dehydration equipment is used to remove gas and liquid water in the gas.
Further, the flash metallurgical equipment is one of a flash smelting furnace, a flash converting furnace, a top flash furnace, a Kiffield furnace and a copper synthesis furnace.
Further, the coarse dust removal equipment is one or a combination of a cyclone dust collector, an inertial dust collector, a dust settling chamber and a settling chamber.
Furthermore, the dust removal component is one or a combination of a plurality of dust settling chambers, electrostatic dust collectors, bag dust collectors, cyclone dust collectors, wet dust collectors and desulfurization dust collectors; preferably a combination of a dust settling chamber and a bag-type dust collector.
Further, the coal gas reforming equipment adopts a methane carbon dioxide reforming method, CH4-H2O-CO2The catalytic reforming method is one of gas reforming devices of a reforming method which takes coke as a raw material and oxygen and carbon dioxide as gasifying agents.
The flash circulating smelting system process for self-heat exchange and coal gas reforming comprises the following processes:
1. high-temperature flue gas with the temperature of 1200-1600 ℃ enters a coal gas main pipeline from a tail gas outlet of the flash metallurgy equipment;
2. mixing the high-temperature flue gas with the cool coal gas returned by the first coal gas shunt pipeline to reduce the temperature of the mixed flue gas to below 900 ℃;
3. introducing the mixed flue gas into coarse dust removal equipment to remove large-particle smoke dust in the flue gas;
4. introducing the flue gas after coarse dust removal into heat exchange equipment, and reducing the temperature to below 150 ℃;
5. introducing the cooled flue gas into a dedusting assembly to ensure that the dust content is lower than 25mg/m3；
6. The desulfurization equipment removes most of sulfur-containing compounds in the coal gas to ensure that the content of S-containing compounds is less than 80mg/m3；
7. Sending the desulfurized coal gas into gas storage and pressure regulation equipment through an induced draft fan for storage;
8. gas with a certain proportion is shunted out through a first gas shunt pipeline, and the gas is pressurized and returned to the outlet end of the tail gas of the flash metallurgy equipment to be mixed with high-temperature flue gas so as to reduce the temperature of the flue gas at the outlet of the flash metallurgy equipment;
9. after adjusting a part of coal gas in the gas storage pressure adjusting device to a required pressure, sending the coal gas into heat exchange equipment, reversely flowing with hot flue gas, and heating to above 800 ℃ after heat exchange; the part of the coal gas is used for reforming to produce reducing coal gas (mainly containing CO and H)2)；
10. Introducing the heat-exchanged coal gas into a coal gas reforming device, introducing natural gas (and partial steam if necessary), combusting oxygen-containing gas and fuel to provide heat for the coal gas reforming device, and enabling CO in the coal gas to be in a high-temperature environment2And CH4Catalytic reforming is carried out. Finally, the reformed reducing gas (CO) is treated2The volume content is less than or equal to 5 percent, and the temperature reaches over 1200 ℃) is input into flash metallurgical equipment.
11. Flash smelting:
1) dry metal oxide ore powder to be smelted, a flux, oxygen and fuel are added into a reduction space of a flash metallurgical device filled with high-temperature reduction gas. The coal gas required in the reduction space can be completely derived from the coal gas returned after tail gas reforming, or part of the coal gas produced by a coal gasification space arranged in the flash metallurgical equipment or externally-matched coal gasification equipment, part of the coal gas returned after tail gas reforming is supplemented by the coal gas returned after tail gas reforming, and the two parts of the coal gas are mixed in the reduction space. It should be noted that: the reducing gas which circularly returns to the flash metallurgical equipment can be sprayed into the flash metallurgical equipment from the top of the reducing space or can be divided into a plurality of strands, and the reducing gas is sprayed into the flash metallurgical equipment from the side wall of the reducing space at a certain angle, so that a rotational flow effect is formed, and the mineral powder and the reducing gas are fully mixed and contacted.
2) After the metal oxide ore powder enters the reduction space, the reduction and melting of the metal oxide to be smelted in the ore powder are rapidly completed through heat transfer, mass transfer and chemical reaction between the metal oxide ore powder and the reducing gas.
3) The melt after reaction falls into a molten pool in a droplet shape, and pulverized coal and oxygen are sprayed into the molten pool through side blowing to provide heat and reducing agent for the molten pool, so that the residual metal oxide is reduced. Gangue components in the mineral powder and the flux have slagging reaction in a molten pool, and molten slag and metal melt form a slag layer and a metal layer from top to bottom due to density difference. It should be noted that: the reducing coal gas which is circularly returned to the flash metallurgical equipment can also be sprayed into a molten pool instead of side blowing of coal powder, on one hand, the reducing coal gas is used as a reducing agent and simultaneously reacts with oxygen to provide heat for the molten pool.
4) Discharging the molten metal formed in the step 3) from a molten pool metal discharge outlet to obtain crude metal or crude steel, discharging slag from a slag discharge outlet, and discharging flue gas from a tail gas outlet after the flue gas enters an uptake flue.
12. Repeating steps 1-11.
Compared with the prior art, the flash cycle smelting system of self-heat exchange and reformed gas has the following advantages:
1) by the method of mixing the returned cool coal gas and the high-temperature tail (flue) gas, the temperature of the tail (flue) gas is reduced under the condition of not wasting the energy of the tail (flue) gas, and the service life of subsequent related tail (flue) gas treatment equipment is prolonged.
2) The waste heat contained in the high-temperature tail gas (smoke) discharged by the flash metallurgical equipment is fully utilized to heat the cool coal gas subjected to dust removal and desulfurization, so that the temperature of the reducing coal gas entering the flash metallurgical equipment is increased, and the comprehensive energy consumption of the system is reduced.
3) CO in high-temperature tail gas (flue gas) discharged from flash metallurgical equipment through gas reforming equipment2Converting into CO, recycling tail gas (smoke), reducing production cost and greatly reducing carbon emission.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
FIG. 1 is a simplified schematic diagram of a flash cycle smelting system with self-heat exchange and reformed gas as described in example 1 of the present invention;
FIG. 2 is a simplified schematic diagram of a flash cycle smelting system with self-heat exchange and reformed gas as described in example 2 of the present invention;
FIG. 3 is a simplified schematic diagram of a flash cycle smelting system with self-heat exchange and reformed gas as described in example 3 of this invention;
FIG. 4 is a simplified schematic diagram of a flash cycle smelting system with self heat exchange and reformed gas as described in example 4 of this invention;
figure 5 is a simplified schematic diagram of a flash cycle smelting system with self heat exchange and reformed gas as described in example 5 of the present invention.
Description of reference numerals:
1-a flash metallurgical plant; 2-coarse dust removal equipment; 3-heat exchange equipment; 4-a dust removal assembly; 5-gas storage and pressure regulation equipment; 6-gas reforming equipment; 7-a desulfurization unit; 8-a fan; 9-a first gas diversion pipeline; 10-preheating equipment; 11-a second gas shunt line; 12-a combustion improver gas supply line; 13-a oxidant gas supply device; 14-mineral powder drying equipment; 15-gas dehydration equipment.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
As shown in fig. 1, the flash-cycle smelting system capable of self-exchanging heat and reforming gas comprises a gas main pipeline, wherein the gas main pipeline comprises a flash-metallurgy device 1, a rough dust removal device 2, a heat medium channel of a heat exchange device 3, a dust removal component 4, a desulfurization device 7, a fan 8, a gas storage pressure regulating device 5, a cold medium channel of the heat exchange device 3 and a gas reforming device 6 which are sequentially communicated through a pipeline, and a reducing gas outlet of the gas reforming device 6 is connected with a reducing gas inlet of the flash-metallurgy device 1 through a pipeline; the device also comprises a first gas shunt pipeline 9, wherein the inlet end of the first gas shunt pipeline 9 is connected with the gas storage and pressure regulation device 5, and the outlet end of the first gas shunt pipeline 9 is connected with a pipeline of a main gas pipeline between the flash metallurgy device 1 and the coarse dust removal device 2; the gas storage pressure regulating device 5 is provided with a valve interface which can be connected with an external gas system.
The working process of the flash circulating smelting system for self-heat exchange and coal gas reforming in the embodiment is as follows:
1. high-temperature flue gas with the temperature of 1200-1600 ℃ enters a coal gas main pipeline from a tail gas outlet of the flash metallurgy equipment;
2. mixing the high-temperature flue gas with the cool coal gas returned by the first coal gas shunt pipeline, and reducing the temperature of the mixed flue gas to be below 900 ℃;
3. introducing the mixed flue gas into coarse dust removal equipment to remove large-particle smoke dust in the flue gas;
4. introducing the flue gas after coarse dust removal into heat exchange equipment, and reducing the temperature to below 150 ℃;
5. introducing the cooled flue gas into a dedusting assembly to ensure that the dust content is lower than 25mg/m3；
6. The desulfurization equipment removes most of sulfur-containing compounds in the coal gas to ensure that the content of S-containing compounds is less than 80mg/m3；
7. Sending the desulfurized coal gas into gas storage and pressure regulation equipment through an induced draft fan for storage;
8. the cool coal gas in the gas storage pressure regulating device is divided into two parts to be output:
1) the first part of coal gas is pressurized and returned to the outlet end of the tail gas of the flash metallurgical equipment through a first coal gas shunt pipeline and is mixed with the high-temperature flue gas so as to reduce the temperature of the flue gas at the outlet of the flash metallurgical equipment;
2) the second part of the gas is used for reforming to produce reducing gas (mainly containing CO and H)2) After the pressure is adjusted to the required pressure, the mixture is sent into heat exchange equipment, and the temperature is raised to be more than 800 ℃ after heat exchange;
9. introducing the heat-exchanged coal gas to be reformed into a coal gas reforming device, introducing natural gas or methane (if necessary, partial steam can be introduced), combusting oxygen-containing gas and fuel to provide heat for the coal gas reforming device, and enabling CO in the coal gas to be in high-temperature environment2And CH4Catalytic reforming is carried out. Finally, the reformed reducing gas (CO) is treated2Volume content of less than or equal to 5 percent and temperature of more than 1200 ℃) into a flash memoryIn metallurgical equipment.
10. Flash smelting:
1) dry metal oxide ore powder to be smelted, a flux, oxygen and fuel are added into a reduction space of a flash metallurgical device filled with high-temperature reduction gas. The coal gas required in the reduction space can be completely derived from the coal gas returned after tail gas reforming, or part of the coal gas produced by a coal gasification space arranged in the flash metallurgical equipment or externally-matched coal gasification equipment, part of the coal gas returned after tail gas reforming is supplemented by the coal gas returned after tail gas reforming, and the two parts of the coal gas are mixed in the reduction space. It should be noted that: the reducing gas which circularly returns to the flash metallurgical equipment can be sprayed into the flash metallurgical equipment from the top of the reducing space or can be divided into a plurality of strands, and the reducing gas is sprayed into the flash metallurgical equipment from the side wall of the reducing space at a certain angle, so that a rotational flow effect is formed, and the mineral powder and the reducing gas are fully mixed and contacted.
2) After the metal oxide ore powder enters the reduction space, the reduction and melting of the metal oxide to be smelted in the ore powder are rapidly completed through heat transfer, mass transfer and chemical reaction between the metal oxide ore powder and the reducing gas.
3) The melt after reaction falls into a molten pool in a droplet shape, and pulverized coal and oxygen are sprayed into the molten pool through side blowing to provide heat and reducing agent for the molten pool, so that the residual metal oxide is reduced. Gangue components in the mineral powder and the flux have slagging reaction in a molten pool, and molten slag and metal melt form a slag layer and a metal layer from top to bottom due to density difference. It should be noted that: the reducing coal gas which is circularly returned to the flash metallurgical equipment can also be sprayed into a molten pool instead of side blowing of coal powder, on one hand, the reducing coal gas is used as a reducing agent and simultaneously reacts with oxygen to provide heat for the molten pool.
4) Discharging the molten metal formed in the step 3) from a molten pool metal discharge outlet to obtain crude metal or crude steel, discharging slag from a slag discharge outlet, and discharging flue gas from a tail gas outlet after the flue gas enters an uptake flue.
11. Repeating the steps 1-10.
Example 2
As shown in fig. 2, in the embodiment 1, different from the embodiment 1, a preheating device 10 is provided on a pipeline between the outlet end of the cooling medium flow passage of the heat exchange device 3 and the inlet end of the gas to be reformed of the gas reforming device 6. The preheating device 10 preheats the coal gas to be reformed flowing out of the cold medium flow passage of the heat exchange device 3; the tail gas outlet end of the coal gas reforming device 6 is connected with a preheating device 10, and the preheating device 10 takes high-temperature tail gas discharged by fuel combustion in the coal gas reforming device 6 as a heat source.
The working process of the flash circulating smelting system for self-heat exchange and coal gas reforming in the embodiment is as follows:
1. high-temperature flue gas with the temperature of 1200-1600 ℃ enters a coal gas main pipeline from a tail gas outlet of the flash metallurgy equipment;
2. mixing the high-temperature flue gas with the cool coal gas returned by the first coal gas shunt pipeline, and reducing the temperature of the mixed flue gas to be below 900 ℃;
3. introducing the mixed flue gas into coarse dust removal equipment to remove large-particle smoke dust in the flue gas;
4. introducing the flue gas after coarse dust removal into heat exchange equipment, and reducing the temperature to below 150 ℃;
5. introducing the cooled flue gas into a dedusting assembly to ensure that the dust content is lower than 25mg/m3；
6. The desulfurization equipment removes most of sulfur-containing compounds in the coal gas to ensure that the content of S-containing compounds is less than 80mg/m3；
7. Sending the desulfurized coal gas into gas storage and pressure regulation equipment through an induced draft fan for storage;
8. the cool coal gas in the gas storage pressure regulating device is divided into two parts to be output:
1) the first part of coal gas is pressurized and returned to the outlet end of the tail gas of the flash metallurgical equipment through a first coal gas shunt pipeline and is mixed with the high-temperature flue gas so as to reduce the temperature of the flue gas at the outlet of the flash metallurgical equipment;
2) the second part of the gas is used for reforming to produce reducing gas (mainly containing CO and H)2) After the pressure is adjusted to the required pressure, the mixture is sent into heat exchange equipment, and the temperature is raised to be more than 700 ℃ after heat exchange;
9. the gas to be reformed after heat exchange and temperature rise is introduced into preheating equipment again, and the waste heat of the high-temperature tail gas discharged by the gas reforming equipment is utilized to continuously heat the gas;
10. then will beIntroducing the preheated coal gas into a coal gas reforming device, introducing natural gas or methane (and partial steam if necessary), combusting oxygen-containing gas and fuel to provide heat for the coal gas reforming device, and enabling CO in the coal gas to be in high-temperature environment2And CH4Catalytic reforming is carried out. Finally, the reformed reducing gas (CO) is treated2The volume content is less than or equal to 5 percent, and the temperature reaches over 1200 ℃) is input into flash metallurgical equipment.
11. Flash smelting:
1) dry metal oxide ore powder to be smelted, a flux, oxygen and fuel are added into a reduction space of a flash metallurgical device filled with high-temperature reduction gas. The coal gas required in the reduction space can be completely derived from the coal gas returned after tail gas reforming, or part of the coal gas produced by a coal gasification space arranged in the flash metallurgical equipment or externally-matched coal gasification equipment, part of the coal gas returned after tail gas reforming is supplemented by the coal gas returned after tail gas reforming, and the two parts of the coal gas are mixed in the reduction space. It should be noted that: the reducing gas which circularly returns to the flash metallurgical equipment can be sprayed into the flash metallurgical equipment from the top of the reducing space or can be divided into a plurality of strands, and the reducing gas is sprayed into the flash metallurgical equipment from the side wall of the reducing space at a certain angle, so that a rotational flow effect is formed, and the mineral powder and the reducing gas are fully mixed and contacted.
2) After the metal oxide ore powder enters the reduction space, the reduction and melting of the metal oxide to be smelted in the ore powder are rapidly completed through heat transfer, mass transfer and chemical reaction between the metal oxide ore powder and the reducing gas.
3) The melt after reaction falls into a molten pool in a droplet shape, and pulverized coal and oxygen are sprayed into the molten pool through side blowing to provide heat and reducing agent for the molten pool, so that the residual metal oxide is reduced. Gangue components in the mineral powder and the flux have slagging reaction in a molten pool, and molten slag and metal melt form a slag layer and a metal layer from top to bottom due to density difference. It should be noted that: the reducing coal gas which is circularly returned to the flash metallurgical equipment can also be sprayed into a molten pool instead of side blowing of coal powder, on one hand, the reducing coal gas is used as a reducing agent and simultaneously reacts with oxygen to provide heat for the molten pool.
4) Discharging the molten metal formed in the step 3) from a molten pool metal discharge outlet to obtain crude metal or crude steel, discharging slag from a slag discharge outlet, and discharging flue gas from a tail gas outlet after the flue gas enters an uptake flue.
12. Repeating steps 1-11.
Example 3
As shown in fig. 3, the embodiment 2 is different from the embodiment 2 in that a second gas diversion pipeline 11 and an oxidant gas supply pipeline 12 are further included; the inlet end of the second gas shunt pipeline 11 is connected with the gas storage pressure regulating device 5, and the outlet end of the second gas shunt pipeline 11 is connected with the fuel inlet end of the gas reforming device 6 after passing through the preheating device 10; the oxidant gas supply pipeline 12 comprises an oxidant gas supply device 13 and an oxidant gas flow passage of the preheating device 10 which are sequentially communicated through pipelines, and the outlet end of the oxidant gas flow passage of the preheating device 10 is communicated with the oxidant gas inlet end of the gas reforming device 6 through a pipeline.
A certain proportion of coal gas is branched from the gas storage pressure regulating device 5 by the second coal gas branching pipeline 11 through a valve to be used as fuel for heating the coal gas reforming device 6, and meanwhile, in order to improve the heating efficiency of the coal gas reforming device 6 and reduce the comprehensive energy consumption of the system, the coal gas which is branched by the second coal gas branching pipeline 11 and enters the coal gas reforming device 6 to be used as fuel and the oxygen-containing gas which is provided by the combustion improver gas supply pipeline 12 and is used as combustion improver can be introduced into the preheating device 10 for preheating.
The working process of the flash circulating smelting system for self-heat exchange and coal gas reforming in the embodiment is as follows:
1. high-temperature flue gas with the temperature of 1200-1600 ℃ enters a coal gas main pipeline from a tail gas outlet of the flash metallurgy equipment;
2. mixing the high-temperature flue gas with the cool coal gas returned by the first coal gas shunt pipeline, and reducing the temperature of the mixed flue gas to be below 900 ℃;
3. introducing the mixed flue gas into coarse dust removal equipment to remove large-particle smoke dust in the flue gas;
4. introducing the flue gas after coarse dust removal into heat exchange equipment, and reducing the temperature to below 150 ℃;
5. introducing the cooled flue gas into a dedusting assembly to ensure that the dust content is lower than 25mg/m3；
6. The desulfurization equipment removes most of sulfur-containing compounds in the coal gas to ensure that the content of S-containing compounds is less than 80mg/m3；
7. Sending the desulfurized coal gas into gas storage and pressure regulation equipment through an induced draft fan for storage;
8. cold coal gas in the gas storage pressure regulating equipment is divided into three parts to be output:
1) the first part of coal gas is pressurized and returned to the outlet end of the tail gas of the flash metallurgical equipment through a first coal gas shunt pipeline and is mixed with the high-temperature flue gas so as to reduce the temperature of the flue gas at the outlet of the flash metallurgical equipment;
2) the second part of coal gas is shunted and enters a second coal gas shunt pipeline to be used as fuel for heating the coal gas reforming equipment;
3) the third part of the gas is used for reforming to produce reducing gas (mainly containing CO and H)2) After the pressure is adjusted to the required pressure, the mixture is sent into heat exchange equipment, and the temperature is raised to be more than 700 ℃ after heat exchange;
9. introducing the gas to be reformed (the third part of gas in the step 8) subjected to heat exchange and temperature rise on the gas main pipeline into preheating equipment, continuously heating the gas by utilizing the waste heat of high-temperature tail gas discharged by the gas reforming equipment, and simultaneously introducing the gas (the second part of gas in the step 8) which is provided by the second gas shunt pipeline and enters the gas reforming equipment as fuel and the oxygen-containing gas which is provided by the combustion improver gas supply pipeline and serves as a combustion improver into the preheating equipment for preheating so as to improve the combustion efficiency;
10. introducing the preheated gas to be reformed into a gas reforming device, introducing natural gas or methane (if necessary, partial steam), combusting oxygen-containing gas and fuel to provide heat for the gas reforming device, maintaining the reforming environment above 900 ℃, and maintaining CO in the gas at high temperature2And CH4Catalytic reforming is carried out. Finally, the reformed reducing gas (CO) is treated2The volume content is less than or equal to 5 percent, and the temperature reaches over 1200 ℃) is input into flash metallurgical equipment.
11. Flash smelting:
1) dry metal oxide ore powder to be smelted, a flux, oxygen and fuel are added into a reduction space of a flash metallurgical device filled with high-temperature reduction gas. The coal gas required in the reduction space can be completely derived from the coal gas returned after tail gas reforming, or part of the coal gas produced by a coal gasification space arranged in the flash metallurgical equipment or externally-matched coal gasification equipment, part of the coal gas returned after tail gas reforming is supplemented by the coal gas returned after tail gas reforming, and the two parts of the coal gas are mixed in the reduction space. It should be noted that: the reducing gas which circularly returns to the flash metallurgical equipment can be sprayed into the flash metallurgical equipment from the top of the reducing space or can be divided into a plurality of strands, and the reducing gas is sprayed into the flash metallurgical equipment from the side wall of the reducing space at a certain angle, so that a rotational flow effect is formed, and the mineral powder and the reducing gas are fully mixed and contacted.
2) After the metal oxide ore powder enters the reduction space, the reduction and melting of the metal oxide to be smelted in the ore powder are rapidly completed through heat transfer, mass transfer and chemical reaction between the metal oxide ore powder and the reducing gas.
3) The melt after reaction falls into a molten pool in a droplet shape, and pulverized coal and oxygen are sprayed into the molten pool through side blowing to provide heat and reducing agent for the molten pool, so that the residual metal oxide is reduced. Gangue components in the mineral powder and the flux have slagging reaction in a molten pool, and molten slag and metal melt form a slag layer and a metal layer from top to bottom due to density difference. It should be noted that: the reducing coal gas which is circularly returned to the flash metallurgical equipment can also be sprayed into a molten pool instead of side blowing of coal powder, on one hand, the reducing coal gas is used as a reducing agent and simultaneously reacts with oxygen to provide heat for the molten pool.
4) Discharging the molten metal formed in the step 3) from a molten pool metal discharge outlet to obtain crude metal or crude steel, discharging slag from a slag discharge outlet, and discharging flue gas from a tail gas outlet after the flue gas enters an uptake flue.
12. Repeating steps 1-11.
Example 4
As shown in fig. 4, in example 3, unlike example 3, a fine ore drying device 14 is provided on the gas main line between the dust-removing unit 4 and the desulfurization device 7, and the fine ore drying device 14 can be used to dry fine ore. It should be noted that: in this embodiment, the fan 8 can be arranged on the main pipeline in front of the ore powder drying device 14 or behind the ore powder drying device 14 in the flow direction of the flue gas.
The working process of the flash circulating smelting system for self-heat exchange and coal gas reforming in the embodiment is as follows:
1. high-temperature flue gas with the temperature of 1200-1600 ℃ enters a coal gas main pipeline from a tail gas outlet of the flash metallurgy equipment;
2. mixing the high-temperature flue gas with the cool coal gas returned by the first coal gas shunt pipeline, and reducing the temperature of the mixed flue gas to be below 900 ℃;
3. introducing the mixed flue gas into coarse dust removal equipment to remove large-particle smoke dust in the flue gas;
4. introducing the flue gas after coarse dust removal into heat exchange equipment, and reducing the temperature to below 250 ℃;
5. introducing the cooled flue gas into a dedusting assembly to ensure that the dust content is lower than 25mg/m3；
6. Introducing the dedusted coal gas into mineral powder drying equipment, and cooling the coal gas to below 120 ℃ after passing through the mineral powder drying equipment;
7. the desulfurization equipment removes most of sulfur-containing compounds in the coal gas to ensure that the content of S-containing compounds is less than 80mg/m3；
8. Sending the desulfurized coal gas into gas storage and pressure regulation equipment through a fan for storage;
9. cold coal gas in the gas storage pressure regulating equipment is divided into three parts to be output:
1) the first part of coal gas is pressurized and returned to the outlet end of the tail gas of the flash metallurgical equipment through a first coal gas shunt pipeline and is mixed with the high-temperature flue gas so as to reduce the temperature of the flue gas at the outlet of the flash metallurgical equipment;
2) the second part of coal gas is shunted and enters a second coal gas shunt pipeline to be used as fuel for heating the coal gas reforming equipment;
3) the third part of the gas is used for reforming to produce reducing gas (mainly containing CO and H)2) After the pressure is adjusted to the required pressure, the mixture is sent into heat exchange equipment, and the temperature is raised to be more than 700 ℃ after heat exchange;
10. introducing the gas to be reformed (the third part of gas in the step 9) subjected to heat exchange and temperature rise on the gas main pipeline into preheating equipment, continuously heating the gas to be reformed by utilizing the waste heat of high-temperature tail gas discharged by the gas reforming equipment, and simultaneously introducing the gas (the second part of gas in the step 9) which is provided by the second gas shunt pipeline and enters the gas reforming equipment as fuel and the oxygen-containing gas which is provided by the combustion improver gas supply pipeline and serves as combustion improver into the preheating equipment for preheating so as to improve the combustion efficiency;
11. introducing the preheated gas to be reformed into a gas reforming device, introducing natural gas or methane (if necessary, partial steam), combusting oxygen-containing gas and fuel to provide heat for the gas reforming device, maintaining the reforming environment above 900 ℃, and maintaining CO in the gas at high temperature2And CH4Catalytic reforming is carried out. Finally, the reformed reducing gas (CO) is treated2The volume content is less than or equal to 5 percent, and the temperature reaches over 1200 ℃) is input into flash metallurgical equipment.
12. Flash smelting:
1) dry metal oxide ore powder to be smelted, a flux, oxygen and fuel are added into a reduction space of a flash metallurgical device filled with high-temperature reduction gas. The coal gas required in the reduction space can be completely derived from the coal gas returned after tail gas reforming, or part of the coal gas produced by a coal gasification space arranged in the flash metallurgical equipment or externally-matched coal gasification equipment, part of the coal gas returned after tail gas reforming is supplemented by the coal gas returned after tail gas reforming, and the two parts of the coal gas are mixed in the reduction space. It should be noted that: the reducing gas which circularly returns to the flash metallurgical equipment can be sprayed into the flash metallurgical equipment from the top of the reducing space or can be divided into a plurality of strands, and the reducing gas is sprayed into the flash metallurgical equipment from the side wall of the reducing space at a certain angle, so that a rotational flow effect is formed, and the mineral powder and the reducing gas are fully mixed and contacted.
2) After the metal oxide ore powder enters the reduction space, the reduction and melting of the metal oxide to be smelted in the ore powder are rapidly completed through heat transfer, mass transfer and chemical reaction between the metal oxide ore powder and the reducing gas.
3) The melt after reaction falls into a molten pool in a droplet shape, and pulverized coal and oxygen are sprayed into the molten pool through side blowing to provide heat and reducing agent for the molten pool, so that the residual metal oxide is reduced. Gangue components in the mineral powder and the flux have slagging reaction in a molten pool, and molten slag and metal melt form a slag layer and a metal layer from top to bottom due to density difference. It should be noted that: the reducing coal gas which is circularly returned to the flash metallurgical equipment can also be sprayed into a molten pool instead of side blowing of coal powder, on one hand, the reducing coal gas is used as a reducing agent and simultaneously reacts with oxygen to provide heat for the molten pool.
4) Discharging the molten metal formed in the step 3) from a molten pool metal discharge outlet to obtain crude metal or crude steel, discharging slag from a slag discharge outlet, and discharging flue gas from a tail gas outlet after the flue gas enters an uptake flue.
13. Repeating steps 1-12.
Example 5
As shown in fig. 5, in addition to embodiment 3, a gas dehydration device 15 is provided between the desulfurization device 7 and the gas storage pressure regulating device 5 on the gas main pipeline, which is different from embodiment 3. It should be noted that: in this embodiment, the fan 8 may be disposed in front of the desulfurization device 7 or behind the gas dehydration device 15 on the gas main pipeline along the flowing direction of the flue gas.
The working process of the flash circulating smelting system for self-heat exchange and coal gas reforming in the embodiment is as follows:
1. high-temperature flue gas with the temperature of 1200-1600 ℃ enters a coal gas main pipeline from a tail gas outlet of the flash metallurgy equipment;
2. mixing the high-temperature flue gas with the cool coal gas returned by the first coal gas shunt pipeline, and reducing the temperature of the mixed flue gas to be below 900 ℃;
3. introducing the mixed flue gas into coarse dust removal equipment to remove large-particle smoke dust in the flue gas;
4. introducing the flue gas after coarse dust removal into heat exchange equipment, and reducing the temperature to below 150 ℃;
5. introducing the cooled flue gas into a dedusting assembly to ensure that the dust content is lower than 25mg/m3；
6. The desulfurization equipment removes most of sulfur-containing compounds in the coal gas to ensure that the content of S-containing compounds is less than 80mg/m3；
7. Introducing the desulfurized coal gas into coal gas dehydration equipment through a fan to remove most of water vapor and water mist in the coal gas;
8. sending the dehydrated coal gas into gas storage and pressure regulation equipment for storage;
9. cold coal gas in the gas storage pressure regulating equipment is divided into three parts to be output:
1) the first part of coal gas is pressurized and returned to the outlet end of the tail gas of the flash metallurgical equipment through a first coal gas shunt pipeline and is mixed with the high-temperature flue gas so as to reduce the temperature of the flue gas at the outlet of the flash metallurgical equipment;
2) the second part of coal gas is shunted and enters a second coal gas shunt pipeline to be used as fuel for heating the coal gas reforming equipment;
3) the third part of the gas is used for reforming to produce reducing gas (mainly containing CO and H)2) After the pressure is adjusted to the required pressure, the mixture is sent into heat exchange equipment, and the temperature is raised to be more than 700 ℃ after heat exchange;
10. introducing the gas to be reformed (the third part of gas in the step 9) subjected to heat exchange and temperature rise on the gas main pipeline into preheating equipment, continuously heating the gas to be reformed by utilizing the waste heat of high-temperature tail gas discharged by the gas reforming equipment, and simultaneously introducing the gas (the second part of gas in the step 9) which is provided by the second gas shunt pipeline and enters the gas reforming equipment as fuel and the oxygen-containing gas which is provided by the combustion improver gas supply pipeline and serves as combustion improver into the preheating equipment for preheating so as to improve the combustion efficiency;
11. introducing the preheated gas to be reformed into a gas reforming device, introducing natural gas or methane (if necessary, partial steam), combusting oxygen-containing gas and fuel to provide heat for the gas reforming device, maintaining the reforming environment above 900 ℃, and maintaining CO in the gas at high temperature2And CH4Catalytic reforming is carried out. Finally, the reformed reducing gas (CO) is treated2The volume content is less than or equal to 5 percent, and the temperature reaches over 1200 ℃) is input into flash metallurgical equipment.
12. Flash smelting:
1) dry metal oxide ore powder to be smelted, a flux, oxygen and fuel are added into a reduction space of a flash metallurgical device filled with high-temperature reduction gas. The coal gas required in the reduction space can be completely derived from the coal gas returned after tail gas reforming, or part of the coal gas produced by a coal gasification space arranged in the flash metallurgical equipment or externally-matched coal gasification equipment, part of the coal gas returned after tail gas reforming is supplemented by the coal gas returned after tail gas reforming, and the two parts of the coal gas are mixed in the reduction space. It should be noted that: the reducing gas which circularly returns to the flash metallurgical equipment can be sprayed into the flash metallurgical equipment from the top of the reducing space or can be divided into a plurality of strands, and the reducing gas is sprayed into the flash metallurgical equipment from the side wall of the reducing space at a certain angle, so that a rotational flow effect is formed, and the mineral powder and the reducing gas are fully mixed and contacted.
2) After the metal oxide ore powder enters the reduction space, the reduction and melting of the metal oxide to be smelted in the ore powder are rapidly completed through heat transfer, mass transfer and chemical reaction between the metal oxide ore powder and the reducing gas.
3) The melt after reaction falls into a molten pool in a droplet shape, and pulverized coal and oxygen are sprayed into the molten pool through side blowing to provide heat and reducing agent for the molten pool, so that the residual metal oxide is reduced. Gangue components in the mineral powder and the flux have slagging reaction in a molten pool, and molten slag and metal melt form a slag layer and a metal layer from top to bottom due to density difference. It should be noted that: the reducing coal gas which is circularly returned to the flash metallurgical equipment can also be sprayed into a molten pool instead of side blowing of coal powder, on one hand, the reducing coal gas is used as a reducing agent and simultaneously reacts with oxygen to provide heat for the molten pool.
4) Discharging the molten metal formed in the step 3) from a molten pool metal discharge outlet to obtain crude metal or crude steel, discharging slag from a slag discharge outlet, and discharging flue gas from a tail gas outlet after the flue gas enters an uptake flue.
13. Repeating steps 1-12.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A flash cycle smelting system of self-heat exchange and reformed gas is characterized in that: the device comprises a coal gas main pipeline, wherein the coal gas main pipeline comprises a flash metallurgy device (1), a coarse dust removal device (2), a heat medium flow channel of a heat exchange device (3), a dust removal component (4), a gas storage pressure regulating device (5), a cold medium flow channel of the heat exchange device (3) and a coal gas reforming device (6) which are communicated through pipelines, and a reducing coal gas outlet of the coal gas reforming device (6) is connected with a reducing gas inlet of the flash metallurgy device (1) through a pipeline; a desulfurization device (7) and a fan (8) are further arranged on the gas main pipeline, and the desulfurization device (7) and the fan (8) are positioned between the dust removal component (4) and the gas storage pressure regulating device (5); the device is characterized by further comprising a first gas shunt pipeline (9), wherein the inlet end of the first gas shunt pipeline (9) is connected with the gas storage and pressure regulation device (5), and the outlet end of the first gas shunt pipeline (9) is connected with a pipeline of a gas main pipeline between the flash metallurgy device (1) and the coarse dust removal device (2).
2. A flash cycle smelting system for self-exchanging heat and reforming gas as defined in claim 1 wherein: preheating equipment (10) is arranged on pipelines at the outlet end of the cold medium flow channel of the heat exchange equipment (3) and the inlet end of the gas to be reformed of the gas reforming equipment (6), and the preheating equipment (10) preheats the gas to be reformed flowing out of the cold medium flow channel of the heat exchange equipment (3); the tail gas outlet end of the coal gas reforming device (6) is connected with the preheating device (10), and the preheating device (10) takes high-temperature tail gas discharged by fuel combustion of the coal gas reforming device (6) as a heat source.
3. A flash cycle smelting system for self-exchanging heat and reforming gas as defined in claim 2 wherein: the coal gas separator also comprises a second coal gas shunt pipeline (11); the inlet end of the second gas shunt pipeline (11) is connected with the gas storage pressure regulating device (5), and the outlet end of the second gas shunt pipeline (11) is connected with the fuel inlet end of the gas reforming device (6) after penetrating through the preheating device (10).
4. A flash cycle smelting system for self-exchanging heat and reforming gas as defined in claim 3 wherein: the coal gas preheating device is characterized by further comprising a combustion improver gas supply pipeline (12), wherein the combustion improver gas supply pipeline (12) comprises a combustion improver gas supply device (13) and a combustion improver gas flow passage of the preheating device (10), which are sequentially communicated through a pipeline, and the outlet end of the combustion improver gas flow passage of the preheating device (10) is communicated with the combustion improver gas inlet end of the coal gas reforming device (6) through a pipeline.
5. A flash cycle smelting system for self-exchanging heat and reforming gas as defined in claim 1 wherein: and the gas storage pressure regulating equipment (5) is provided with a valve interface which can be connected with an external gas system.
6. A flash cycle smelting system for self-exchanging heat and reforming gas as defined in claim 1 wherein: the coal gas desulfurization device is characterized by further comprising mineral powder drying equipment (14), wherein the mineral powder drying equipment (14) is arranged on the coal gas main pipeline and is positioned between the dust removal assembly (4) and the desulfurization equipment (7).
7. A flash cycle smelting system for self-exchanging heat and reforming gas as defined in claim 1 wherein: the coal gas dehydration device (15) is arranged on the coal gas main pipeline and is positioned between the desulfurization device (7) and the gas storage and pressure regulation device (5).
8. A flash cycle smelting system for self-exchanging heat and reforming gas as defined in any one of claims 1 to 7, wherein: the flash metallurgical equipment (1) is one of a flash smelting furnace, a flash converting furnace, a top flash furnace, a Kiffrutt furnace and a copper synthesis furnace.
9. A flash cycle smelting system for self-exchanging heat and reforming gas as defined in any one of claims 1 to 7, wherein: the coarse dust removal equipment (2) is one or a combination of a cyclone dust collector, an inertial dust collector, a dust settling chamber and a settling chamber.
10. A flash cycle smelting system for self-exchanging heat and reforming gas as defined in any one of claims 1 to 7, wherein: the coal gas reforming device (6) adopts a methane carbon dioxide reforming method,CH4-H2O-CO2the catalytic reforming method is one of gas reforming devices of a reforming method which takes coke as a raw material and oxygen and carbon dioxide as gasifying agents.
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