CN213895738U - System for preparing gas-based shaft furnace reducing gas by purifying coke oven gas - Google Patents
System for preparing gas-based shaft furnace reducing gas by purifying coke oven gas Download PDFInfo
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- CN213895738U CN213895738U CN202022850825.6U CN202022850825U CN213895738U CN 213895738 U CN213895738 U CN 213895738U CN 202022850825 U CN202022850825 U CN 202022850825U CN 213895738 U CN213895738 U CN 213895738U
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Abstract
The utility model relates to a purify coke oven gas preparation gas base shaft furnace reduction gas system, including carrying out purification treatment's coke oven gas purifier to coke oven gas, turn into the reduction gas reborner of reduction gas and carry out purification treatment's furnace top gas purifier to shaft furnace exhaust furnace top gas with coke oven gas after purifying, coke oven gas purifier's air inlet and coke oven gas pipe connection, coke oven gas purifier's gas outlet respectively with the fuel gas entry of reduction gas reborner and the feed gas entry linkage of reduction gas reborner, the reduction gas export of reduction gas reborner is connected with the reduction gas entry of shaft furnace, the top gas export of shaft furnace is connected with furnace top gas purifier's air inlet, furnace top gas purifier's gas outlet respectively with the fuel gas entry of reduction gas reborner and the feed gas entry linkage of reduction gas reborner. The utility model solves the technical problem that coke oven gas can not be further processed in the prior art so as to provide the reducing gas for the gas-based shaft furnace.
Description
Technical Field
The utility model relates to a ferrous metallurgy technical field, it is further, relate to a purify coke oven gas preparation gas base shaft furnace reduction gas system, especially relate to a system that adopts deep purification's coke oven gas preparation gas base shaft furnace reduction gas.
Background
The steel production has two long and short processes, wherein the long process is the combination of blast furnace iron making and converter steel making, and the short process is the combination of direct reduced iron and electric furnace steel making. The traditional blast furnace iron making has the characteristics of long process, high energy consumption, heavy pollution, coke consumption and the like, and although various energy-saving and emission-reduction measures have been implemented to achieve certain effects, the metallurgical thermodynamic reaction related to the long process based on carbon reduction tends to the limit level, and the CO emission is continuously reduced2Has very limited potential, so that new ones must be foundSolves the problem of CO in the iron and steel industry2High emission problem, and CO discharged by per ton steel produced by short process2Much lower than the long run.
At the present stage, the social and economic structure of China cannot provide enough scrap steel as a raw material of a short process, and sponge iron needs to be adopted to replace the scrap steel as the raw material. Direct Reduction Iron (sponge Iron) in a short process is also called as sponge Iron, has stable components and low content of harmful impurity elements, is a high-quality raw material for steelmaking, can be used as a raw material for electric furnace steelmaking and a coolant for converter steelmaking to supplement the deficiency of steel scrap resources, and plays an irreplaceable role in ensuring the quality of steel and producing high-quality pure steel. The world advanced direct reduced iron technology is a gas-based shaft furnace direct reduction technology which mainly takes natural gas as raw material and is rich in CH4And CO2Is reacted to become H-rich2And after the CO gas is mixed, the reaction product is directly subjected to reduction reaction with iron ore under the high-temperature condition to produce sponge iron. Because natural gas resources in China are deficient, the development of the gas-based shaft furnace reduction technology is limited. The coke oven gas resources in China are relatively rich, and the hydrogen-rich gas is prepared by using the coke oven gas, so that the problems of gas emission and utilization are solved, and a method for obtaining the hydrogen-rich reducing gas is provided for producing the direct reduced iron at the present stage. The method for preparing the reducing gas by adopting the coke oven gas is a preferred technical route which accords with the national conditions of China and is an important direction for developing a novel iron-making technology in China.
With the development of the technology, the requirements of the gas-based shaft furnace on reducing gas are more extensive, and the requirements are further met
Greater than 10 (wherein,
as a volume fraction),
more than 0.3 and the pressure is 0.1-0.90 MPa. Compared with natural gas, the coke oven gas resource in China is relatively rich, but the subsequent utilization process is not matched, so that a large amount of coke oven gas is wasted. Coke oven gas containing H2S、CS2、COS、NH3And impurities such as BTX (benzene, toluene, xylene, etc.), tar, naphthalene, etc., which cause the conventional gas-based shaft furnace process using natural gas as a gas source to be incapable of running, and a gas-based shaft furnace reducing gas process suitable for coke oven gas needs to be developed.
No effective solution is provided at present for the problem that coke oven gas cannot be further processed in the related art so as to provide the reduction gas for the gas-based shaft furnace.
Therefore, the inventor provides a system for preparing gas-based shaft furnace reducing gas by purifying coke oven gas by virtue of experience and practice of related industries for many years, so as to overcome the defects in the prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a purify coke oven gas preparation gas base shaft furnace reduction gas system removes dust, deoils, removes the naphthalene, removes organic sulfur and removes processing such as inorganic sulphur to coke oven gas to impurity in the deep purification coke oven gas, and make the coke oven gas catalytic conversion after the purification reduce gas that gas base shaft furnace used, reach energy-conservation and reduce discharging CO2The effect of (2) is favorable to steel mill upgrading and transformation and promotes the quality of product, has very big development prospect.
The purpose of the utility model can be realized by adopting the following technical scheme:
the utility model provides a purify coke oven gas preparation gas base shaft furnace reduction gas system, including the coke oven gas purifier who carries out purification treatment to coke oven gas, turn into the reduction gas reborner of reduction gas with the coke oven gas after purifying and carry out purification treatment's furnace top gas purifier to shaft furnace exhaust furnace top gas, wherein:
the gas inlet of the coke oven gas purification device is connected with a coke oven gas pipeline, the gas outlet of the coke oven gas purification device is respectively connected with the fuel gas inlet of the reducing gas converter and the raw gas inlet of the reducing gas converter, the reducing gas outlet of the reducing gas converter is connected with the reducing gas inlet of the shaft furnace, the top gas outlet of the shaft furnace is connected with the gas inlet of the top gas purification device, and the gas outlet of the top gas purification device is respectively connected with the fuel gas inlet of the reducing gas converter and the raw gas inlet of the reducing gas converter.
In a preferred embodiment of the present invention, the coke oven gas purification apparatus includes a dust removing device, a tar removing device, a naphthalene removing device, an organic sulfur removing device and an inorganic sulfur removing device, wherein an air inlet of the dust removing device is connected to a coke oven gas pipeline, an air outlet of the dust removing device is connected to an air inlet of the tar removing device, an air outlet of the tar removing device is connected to an air inlet of the naphthalene removing device, an air outlet of the naphthalene removing device is connected to an air inlet of the organic sulfur removing device, an air outlet of the organic sulfur removing device is connected to an air inlet of the inorganic sulfur removing device, and an air outlet of the inorganic sulfur removing device is connected to a fuel gas inlet of the reducing gas reformer;
the gas inlet of the dust removing equipment is the gas inlet of the coke oven gas purifying device, and the gas outlet of the inorganic sulfur removing equipment is the gas outlet of the coke oven gas purifying device.
The utility model discloses an in a preferred embodiment, purify coke oven gas preparation gas base shaft furnace reduction gas system still includes the heat recovery unit that preheats intensification to furnace roof gas purifier exhaust process gas, furnace roof gas purifier's gas outlet is passed through heat recovery unit respectively with the fuel gas entry of reduction gas reformer with the feed gas entry connection of reduction gas reformer, coke oven gas purifier's gas outlet is passed through heat recovery unit with the feed gas entry connection of reduction gas reformer.
In a preferred embodiment of the present invention, the flue gas outlet of the reducing gas reformer is connected to the flue gas inlet of the heat recovery device, and the flue gas outlet of the heat recovery device is directly connected to the outside.
In a preferred embodiment of the present invention, a pressurizing device for adjusting the gas transmission pressure is provided between the gas outlet of the top gas purification device and the raw gas inlet of the reducing gas reformer.
In a preferred embodiment of the present invention, the top gas purification device comprises a heat exchanger, a scrubber and an adsorption desulfurization tower, wherein an air inlet of the heat exchanger is connected to a top gas outlet of the shaft furnace, an air outlet of the heat exchanger is connected to an air inlet of the scrubber, an air outlet of the scrubber is connected to an air inlet of the adsorption desulfurization tower, and an air outlet of the adsorption desulfurization tower is connected to a fuel gas inlet of the reducing gas reformer and a raw material gas inlet of the reducing gas reformer respectively;
the air inlet of the heat exchanger is the air inlet of the furnace top gas purification device, and the air outlet of the adsorption desulfurization tower is the air outlet of the furnace top gas purification device.
In a preferred embodiment of the present invention, the desorption gas outlet of the adsorption desulfurization tower is connected to the desorption gas inlet of the heat exchanger, and the desorption gas outlet of the heat exchanger is connected to the desorption gas inlet of the adsorption desulfurization tower.
In a preferred embodiment of the present invention, the desorption gas outlet of the adsorption desulfurization tower is connected to the fuel gas inlet of the reducing gas reformer through the heat recovery unit.
In a preferred embodiment of the present invention, the adsorption desulfurization tower is filled with a molecular sieve material that can adsorb organic sulfur and inorganic sulfur contained in the top gas and can be desorbed and regenerated after being heated.
In a preferred embodiment of the present invention, the number of the adsorption desulfurization towers is plural, and at least one of the adsorption desulfurization towers is a spare adsorption desulfurization tower.
In a preferred embodiment of the present invention, the reducing gas reformer is provided inside with a plurality of catalyst tubes for catalytically reforming the raw gas discharged from the coke oven gas purification device and the process gas discharged from the top gas purification device into the reducing gas required for reducing the iron ore, and each of the catalyst tubes is connected in parallel between the raw gas inlet of the reducing gas reformer and the reducing gas outlet of the reducing gas reformer.
In a preferred embodiment of the present invention, the catalyst tube is filled with a nickel-based catalyst.
In a preferred embodiment of the present invention, the top gas outlet is disposed at the top of the shaft furnace, and an iron ore inlet is disposed at the top of the shaft furnace and above the top gas outlet;
the reducing gas inlet is arranged at the bottom of the shaft furnace, and a sponge iron outlet is arranged at the bottom of the shaft furnace and below the reducing gas inlet.
From the above, the utility model discloses a purify coke oven gas preparation gas base shaft furnace reduction gas system's characteristics and advantage are: the coke oven gas after primary purification is subjected to deep purification treatment by adopting the coke oven gas purification device, so that the effects of removing dust, oil, naphthalene, organic sulfur, inorganic sulfur and other impurities are achieved, and the purified coke oven gas and CO are obtained2Capable of catalytic conversion to H-rich2And CO reducing gas can be used for carrying out reduction reaction with iron ore in the gas-based shaft furnace and achieving the purposes of saving energy and reducing emission2Effectively solves the problem of CO in the steel industry2The problem of high emission is favorable for upgrading and modifying a steel mill and improving the quality of products, and the method has great development prospect.
Drawings
The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:
FIG. 1: is a schematic structural diagram of a system for preparing gas-based shaft furnace reducing gas by purifying coke oven gas.
FIG. 2: is a structural schematic diagram of a coke oven gas purification device in a gas-based shaft furnace reducing gas system for preparing coke oven gas.
FIG. 3: is a structural schematic diagram of a furnace top gas purification device in a system for preparing gas-based shaft furnace reducing gas by purifying coke oven gas.
FIG. 4: is a structural schematic diagram of a reducing gas converter in a system for preparing gas-based shaft furnace reducing gas by purifying coke oven gas.
The utility model provides an reference numeral does:
1. a coke oven gas purification device; 101. A dust removal device;
102. a tar removal unit; 103. Naphthalene removal equipment;
104. an organic sulfur removal device; 105. Inorganic sulfur removal equipment;
2. a reducing gas reformer; 201. A raw material gas inlet;
202. a reducing gas outlet; 203. A fuel gas inlet;
204. a flue gas outlet; 205. A catalyst tube;
3. a top gas purification device; 301. A heat exchanger;
302. a scrubber; 303. An adsorption desulfurization tower;
4. a heat recovery device; 5. A pressurizing device;
6. a shaft furnace; 601. A top gas outlet;
602. a reducing gas inlet; 603. An iron ore inlet;
604. a sponge iron outlet; 10. A first gas transmission pipeline;
11. a second gas transmission pipeline; 12. A third gas transmission pipeline;
13. a fourth gas transmission pipeline; 14. A fifth gas transmission pipeline;
15. a sixth gas transmission pipeline; 16. A seventh gas transmission pipeline;
17. an eighth gas transmission pipeline; 18. A ninth gas transmission pipeline;
19. a tenth gas transmission pipeline; 20. An eleventh gas transmission pipeline;
21. a twelfth gas transmission pipeline.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in fig. 1 to 4, the utility model provides a purify coke oven gas preparation gas base shaft furnace reduction gas system, this purify coke oven gas preparation gas base shaft furnace reduction gas system includes coke oven gas purifier 1, reducing gas converter 2 and top gas purifier 3, coke oven gas purifier 1 is used for carrying out purification treatment to coke oven gas, reducing gas converter 2 is used for turning into reducing gas with the coke oven gas after purifying, top gas purifier 3 is used for carrying out purification treatment to the top gas of 6 exhausts in the shaft furnace. Wherein: the gas inlet of the coke oven gas purification device 1 is connected with a coke oven gas pipeline, the gas outlet of the coke oven gas purification device 1 is respectively connected with the fuel gas inlet 203 of the reducing gas reformer 2 and the raw gas inlet 201 of the reducing gas reformer 2, the reducing gas outlet 202 of the reducing gas reformer 2 is connected with the reducing gas inlet 602 of the shaft furnace 6 through the fifth gas transmission pipeline 14, the top gas outlet 601 of the shaft furnace 6 is connected with the gas inlet of the top gas purification device 3, and the gas outlet of the top gas purification device 3 is respectively connected with the fuel gas inlet 203 of the reducing gas reformer 2 and the raw gas inlet 201 of the reducing gas reformer 2.
The utility model discloses a coke oven gas purifier 1 carries out deep purification to the coke oven gas after preliminary purification, reaches the effect of dust removal, deoiling, removing naphthalene, removing organic sulfur and removing impurity such as inorganic sulfur for coke oven gas after the purification and the CO in the roof gas of 6 exhaustss of shaft furnace 62Capable of catalytic conversion to H-rich2And CO reducing gas, not only can be used for carrying out reduction reaction with the iron ore in the shaft furnace 6, but also can achieve the purposes of saving energy and reducing emission2Effectively solves the problem of CO in the steel industry2The problem of high emission is favorable for upgrading and reconstruction of steel mills and improvement of product quality.
Specifically, as shown in fig. 1, a top gas outlet 601 is provided at the top of the shaft furnace 6, and an iron ore inlet 603 is provided at the top of the shaft furnace 6 and above the top gas outlet 601; a reducing gas inlet 602 is provided at the bottom of the shaft furnace 6 and a sponge iron outlet 604 is provided at the bottom of the shaft furnace 6 below the reducing gas inlet 602.
Further, the pressure of the reducing gas in the fifth gas transmission pipeline 14 is 0.3MPa to 0.5MPa, the temperature of the reducing gas is 850 ℃ to 1100 ℃, and the reducing gas is in the reducing gas
Greater than 10 in reducing gas
Is greater than 0.3 of the total weight of the rubber,
preferably, in a reducing gas
Is 1 to 3.
The utility model discloses an optional embodiment, as shown in fig. 1, fig. 2, coke oven gas purification device 1 is including the dust collecting equipment 101 that connects gradually, remove tar equipment 102, remove naphthalene equipment 103, remove organic sulfur equipment 104 and remove inorganic sulphur equipment 105, the coke oven gas pipeline is connected to dust collecting equipment 101's air inlet, dust collecting equipment 101's gas outlet and the air inlet that removes tar equipment 102 are connected, remove tar equipment 102's gas outlet and the air inlet that removes naphthalene equipment 103 are connected, remove naphthalene equipment 103's gas outlet and the air inlet that removes organic sulfur equipment 104 and be connected, remove organic sulfur equipment 104's gas outlet and be connected with the air inlet that removes inorganic sulphur equipment 105, the gas outlet that removes inorganic sulphur equipment 105 is connected with the fuel gas entry 203 that reduces gas reformer 2. Wherein, the air inlet of the dust removing device 101 is the air inlet of the coke oven gas purifying device 1, and the air outlet of the inorganic sulfur removing device 105 is the air outlet of the coke oven gas purifying device 1. The coke oven gas after primary purification is subjected to deep purification treatment sequentially through the dust removal equipment 101, the tar removal equipment 102, the naphthalene removal equipment 103, the organic sulfur removal equipment 104 and the inorganic sulfur removal equipment 105, so that the effects of removing dust, oil, naphthalene, organic sulfur and inorganic sulfur and other impurities are achieved, and the purified coke oven gas is rich in CH4Gas capable of reacting with CO in the top gas discharged from the shaft furnace 62Catalytic conversion to H-rich2And CO for reducing iron ore in the shaft furnace 6 and achieving CO emission reduction2The effect of (1).
Further, the dust removing device 101 may be, but is not limited to, a bag-type dust remover.
Further, the tar removal apparatus 102 may be, but is not limited to, a tar remover.
Further, the naphthalene removal device 103 may be, but is not limited to, a naphthalene remover.
Further, both the organic sulfur removal device 104 and the inorganic sulfur removal device 105 may be an existing organic sulfur removal device and an existing inorganic sulfur removal device, which hydrogenates in the organic sulfur removal device 104 and converts into inorganic sulfur under the catalytic action of a nickel-based catalyst, and conveys the inorganic sulfur to the inorganic sulfur removal device for removal.
After the coke oven gas after primary purification passes through the dust removal equipment 101, the tar removal equipment 102, the naphthalene removal equipment 103, the organic sulfur removal equipment 104 and the inorganic sulfur removal equipment 105 in sequence, the content of sulfur in the gas discharged by the coke oven gas purification device 1 after purification is less than 1mg/Nm3The benzene content is less than 1mg/Nm3Naphthalene content of less than 5mg/Nm3And (4) finishing.
In an optional embodiment of the present invention, as shown in fig. 1, the system for purifying coke oven gas to prepare gas-based shaft furnace reducing gas further comprises a heat recovery device 4, the heat recovery device 4 is used for preheating the process gas exhausted from the top gas purification device 3, the gas outlet of the top gas purification device 3 is connected to the fuel gas inlet 203 of the reducing gas reformer 2 and the raw gas inlet 201 of the reducing gas reformer 2 through the heat recovery device 4, and the gas outlet of the coke oven gas purification device 1 is connected to the raw gas inlet 201 of the reducing gas reformer 2 through the heat recovery device 4. The process gas and the feed gas before entering the reducing gas reformer 2 are preheated by the heat recovery device 4.
Further, as shown in fig. 1, the flue gas outlet of the reducing gas reformer 2 is connected to the flue gas inlet of the heat recovery device 4 through a sixth gas transmission pipeline 15, and the flue gas outlet of the heat recovery device 4 is directly communicated with the outside.
In an alternative embodiment of the present invention, as shown in fig. 1, a pressurizing device 5 is disposed between the gas outlet of the top gas purifying device 3 and the raw gas inlet 201 of the reducing gas reformer 2, and the pressurizing device 5 adjusts the gas transmission pressure to pressurize the process gas and transmit the process gas to the raw gas inlet 201 of the reducing gas reformer 2.
Further, the pressing device 5 may be, but is not limited to, a press.
In an optional embodiment of the present invention, as shown in fig. 1 and fig. 3, the top gas purification device 3 comprises a heat exchanger 301, a scrubber 302 and an adsorption desulfurization tower 303, the gas inlet of the heat exchanger 301 is connected with the top gas outlet 601 of the shaft furnace 6 through a seventh gas transmission pipeline 16, the gas outlet of the heat exchanger 301 is connected with the gas inlet of the scrubber 302 through an eighth gas transmission pipeline 17, the gas outlet of the scrubber 302 is connected with the gas inlet of the adsorption desulfurization tower 303 through a ninth gas transmission pipeline 18, the gas outlet of the adsorption desulfurization tower 303 is connected with the fuel gas inlet 203 of the reducing gas reformer 2 through a fourth gas transmission pipeline 13, the gas outlet of the adsorption desulfurization tower 303 is further connected with the raw gas inlet 201 of the reducing gas reformer 2 through a third gas transmission pipeline 12, the fourth gas transmission pipeline 13 and the third gas transmission pipeline 12 both pass through the heat recovery device 4, the pressurization device 5 is disposed on the third gas transmission pipeline 12, the gas outlet of the coke oven gas purification device 1 is connected with the fuel gas inlet 203 of the reducing gas reformer 2 through the first gas transmission pipeline 10, and the gas outlet of the coke oven gas purification device 1 is connected with the raw material gas inlet 201 of the reducing gas reformer 2 through the second gas transmission pipeline 11. Wherein, the air inlet of the heat exchanger 301 is the air inlet of the top gas purification device 3, and the air outlet of the adsorption desulfurization tower 303 is the air outlet of the top gas purification device 3.
Further, the number of the adsorption desulfurization towers 303 is plural, and at least one of the adsorption desulfurization towers 303 is a spare adsorption desulfurization tower.
Further, as shown in fig. 1, a desorption gas outlet of the adsorption desulfurization tower 303 is connected with a desorption gas inlet of the heat exchanger 301 through an eleventh gas transmission pipeline 20, and a desorption gas outlet of the heat exchanger 301 is connected with a desorption gas inlet of the adsorption desulfurization tower 303 through a tenth gas transmission pipeline 19.
Further, as shown in fig. 1, the desorbed gas outlet of the adsorption desulfurization tower 303 is connected to the fuel gas inlet 203 of the reducing gas reformer 2 sequentially through the twelfth gas transmission pipeline 21 and the fourth gas transmission pipeline 13, and the desorbed gas generated by the adsorption desulfurization tower 303 is preheated by the heat recovery device 4, and then introduced into the reducing gas reformer 2 for combustion and heat supply.
Further, the inside of the adsorption desulfurization tower 303 is filled with a molecular sieve material that can adsorb organic sulfur and inorganic sulfur contained in the top gas and can be desorbed and regenerated after being heated.
Preferably, the molecular sieve material is a hydrophobic microcrystalline material, can adsorb inorganic sulfur and organic sulfur, has adsorption capacity within the temperature range of 20-100 ℃, and can perform desorption regeneration within the temperature range of 160-350 ℃; the molecular sieve material has a service life of 7-10 years, can be repeatedly regenerated, and is high-temperature resistant.
Furthermore, the hydrophobic microcrystalline material can be made of a material containing at least one element of magnesium, calcium, strontium, yttrium, lanthanum, cerium, europium, iron, cobalt, nickel, copper, silver, zinc and the like; specifically, the hydrophobic microcrystalline material is selected from at least one of an X-type molecular sieve, a Y-type molecular sieve, an a-type molecular sieve, a ZSM-type molecular sieve, mordenite, a beta-type molecular sieve, an MCM-type molecular sieve, and a SAPO-type molecular sieve, and in actual implementation, a person skilled in the art can reasonably set the amount of the catalyst according to the needs of field operation.
In an optional embodiment of the present invention, as shown in fig. 1 and 4, a plurality of catalyst pipes 205 are disposed inside the reducing gas reformer 2, each catalyst pipe 205 is connected in parallel between the raw gas inlet 201 of the reducing gas reformer 2 and the reducing gas outlet 202 of the reducing gas reformer 2, and the raw gas discharged from the coke oven gas purification apparatus 1 and the process gas discharged from the top gas purification apparatus 3 are catalytically reformed into the reducing gas required for reducing the iron ore through each catalyst pipe 205.
Further, the catalyst packed in the catalyst tube 205 may be, but is not limited to, a nickel-based catalyst.
The utility model discloses a basic operating principle does: the iron ore is fed into the shaft furnace 6 from the iron ore inlet 603 of the shaft furnace 6, the reducing gas flows from bottom to top in the shaft furnace 6, and the reducing gas (rich in H) flows from bottom to top2And CO gas) with iron ore (Fe)2O3) Reacting to generate sponge iron (Fe) and top gas (rich in H)2CO and CO2A gas);the top gas is discharged through the top gas outlet 601 of the shaft furnace 6, and first enters the heat exchanger 301, and the top gas and the desorption gas (rich in H) discharged from the adsorption desulfurization tower 3032CO and CO2Gas), then enters a scrubber 302 for dedusting and cooling, then enters an adsorption desulfurization tower 303 for removing organic sulfur, inorganic sulfur and other impurities in the top gas by adopting a molecular sieve material, the process gas of the adsorption desulfurization tower 303 after being purified by the adsorption desulfurization tower 303 is divided into two parts, and one part of the process gas is conveyed to a heat recovery device 4 for preheating and heating to about 300 ℃, then is mixed with the desorption gas output by the adsorption desulfurization tower 303 and enters a reducing gas converter 2 as fuel for combustion and heating of the reducing gas converter 2; the other part of the process gas is pressurized to 0.3MPa to 0.5MPa by a pressurizing device 5, then mixed with Coke Oven Gas (COG) deeply purified by a coke oven gas purifying device 1, preheated to 500 ℃ to 700 ℃ by a heat recovery device 4 and conveyed to a reducing gas converter 2, the mixed gas of the process gas and the coke oven gas is subjected to catalytic reforming reaction in a catalyst pipe 205 in the reducing gas converter 2, and CH in the coke oven gas4And CO2And CO in the top gas2As raw material to produce CO and H2(chemical formula of reaction: CH)4+CO2＝2CO+2H2) Since the catalytic reforming reaction is an endothermic reaction, the required heat comes from the combustion of part of the process gas, part of the deeply purified coke oven gas and the desorbed gas in the reducing gas converter 2. Finally, the reaction is carried out to produce H-rich2And CO as a reducing gas, is conveyed into the shaft furnace 6 through a reducing gas inlet 602.
The total sulfur content in the primarily purified coke oven gas (namely the coke oven gas which is not purified by the coke oven gas purification device 1) is less than or equal to 500mg/Nm3(i.e., 500mg/Nm or less)3) The tar content is less than or equal to 50mg/Nm3(i.e., less than or equal to 50 mg/Nm)3) The BTX (benzene, toluene, xylene, etc.) content is less than or equal to 2500mg/Nm3(i.e., less than or equal to 2500 mg/Nm)3) The naphthalene content is less than or equal to 500mg/Nm3(i.e., 500mg/Nm or less)3) Firstly enters the dust removing device 101 for removing dust to<10mg/Nm3(i.e., dust content of less than 10 mg/Nm)3) Then enters a tar removing device 102 to remove tar<1mg/Nm3(i.e., tar content of less than 1 mg/Nm)3) Then enters a naphthalene removal device 103 to remove naphthalene<5mg/Nm3(i.e., naphthalene content less than 5 mg/Nm)3) Enters an organic sulfur removal device 104 to catalytically hydrogenate organic sulfur to convert organic sulfur into inorganic sulfur, and then enters an inorganic sulfur removal device 105 to remove sulfur<1mg/Nm3(i.e., a sulfur content of less than 1 mg/Nm)3) Then mixed with the pressurized process gas (the mixing pressure is 0.3Mpa to 0.5Mpa), preheated and then conveyed into the reducing gas converter 2.
The utility model discloses a concrete embodiment does: iron ore (Fe)2O3) After being processed into pellets or lump ore, the raw materials are fed from an iron ore inlet 603 of the shaft furnace 6, reducing gas reversely flows from bottom to top in the shaft furnace 6 and is subjected to reduction reaction with the iron ore at the temperature of 900 ℃ to obtain sponge iron (Fe) and top gas (rich in H)2CO and CO2Gas). The top gas is discharged from the top gas outlet 601 of the shaft furnace 6, enters the heat exchanger 301, and is desorbed (rich in H) with the desorption gas output from the adsorption desulfurization tower 303 in the heat exchanger 3012CO and CO2Gas) to raise the temperature of the desorbed gas to 260 ℃, and the adsorption desulfurization tower 303 carries out regeneration. The top gas enters a scrubber 302 for cooling and dedusting after exchanging heat in a heat exchanger 301, then enters an adsorption desulfurization tower 303 for removing hydrogen sulfide and organic sulfur mixed in the top gas, the process gas output after passing through the adsorption desulfurization tower 303 is divided into two parts, one part of the process gas (accounting for 10-50% of the total amount, preferably 30%) is preheated by a heat recovery device 4 until the temperature reaches 300 ℃, and then enters a reducing gas reformer 2 for combustion through a fuel gas inlet 203 of the reducing gas reformer 2 to supply heat for the reducing gas reformer 2; the other part of the process gas (50-90%, preferably 70% of the total amount) is pressurized to 0.4MPa by the pressurizing device 5, preheated by the heat recovery device 4 to a temperature of 650 ℃, enters the catalyst tube 205 in the reducing gas converter 2 through the raw material gas inlet 201 of the reducing gas converter 2, and undergoes a reforming reaction under the action of the catalyst in the catalyst tube 205 to obtain CH4And CO2Reforming to H2And CO. In the reducing gas reformer 2, the catalyst tube 205 is heated by high-temperature flue gas burned from the outside, the temperature of the reducing gas obtained by the reaction is about 900 ℃,
and is about 1.5 of the total weight of the alloy,
the reducing gas is fed into the shaft furnace 6 through the reducing gas inlet 602 to react with the iron ore in the shaft furnace 6 to produce sponge iron, and the sponge iron with the temperature of 500 ℃ is output from the sponge iron outlet 604 at the lower part of the shaft furnace 6.
Wherein, the number of the adsorption desulfurization tower 303 is 4, and 1 is a standby adsorption desulfurization tower. When the adsorption of the adsorption desulfurization tower 303 reaches a preset saturation threshold, 3000Nm is extracted3The process gas of/h enters a heat exchanger 301, is heated to 260 ℃, and then enters an adsorption desulfurization tower 303 for desorption and regeneration. The regeneration of the adsorption desulfurization tower 303 is divided into three stages of temperature rise, heat preservation and cooling, and the regeneration period is 3 days. In the regeneration process, impurities such as sulfur-containing compounds and the like adsorbed by the molecular sieve material enter desorption gas, and the desorption gas and process gas are mixed and enter the reducing gas conversion furnace 2 for combustion treatment.
Wherein, the primary purified coke oven gas is 50000Nm3H, total sulfur content 300mg/Nm3Tar content of 20mg/Nm and benzene content of 500mg/Nm3Naphthalene content of 500mg/Nm3After being purified by the coke oven gas purification device 1, the sulfur content in the gas is less than 1mg/Nm3Benzene content of less than 1mg/Nm3Naphthalene content of less than 5mg/Nm3Wherein the fuel gas is present in 2000Nm3And/h, conveying the mixture into a reducing gas converter 2, mixing the rest purified coke oven gas with the process gas pressurized by a pressurizing device 5, preheating the mixture by a heat recovery device 4, and then feeding the mixture into the reducing gas converter 2.
The utility model discloses a purify coke oven gas preparation gas base shaft furnace reduction gas system's characteristics and advantage are:
firstly, the deep purification part of the coke oven gas after primary purification is carried out by the gas-based shaft furnace reducing gas system for preparing the purified coke oven gasThe effects of removing dust, oil, naphthalene, organic sulfur and inorganic sulfur are achieved, so that the purified coke oven gas and the CO in the top gas discharged from the shaft furnace 62Capable of catalytic conversion to H-rich2And CO reducing gas, not only can be used for carrying out reduction reaction with the iron ore in the shaft furnace 6, but also can achieve the purposes of saving energy and reducing emission2The effect of (1).
Secondly, in the system for preparing the gas-based shaft furnace reducing gas by purifying the coke oven gas, the adsorption desulfurization tower 303 is filled with molecular sieve materials, inorganic sulfur and organic sulfur in the top gas of the furnace are adsorbed and removed through the molecular sieve materials, and the desorbed gas heats the converter, so that the desulfurization precision is high, the selectivity is higher, and carbon dioxide is not lost.
And thirdly, the heat recovery device 4 and the heat exchanger 301 are arranged in the system for preparing the gas-based shaft furnace reducing gas by purifying the coke oven gas, the process gas entering the reducing gas converter 2 is preheated, the reducing gas produced by the reducing gas converter 2 can be directly conveyed into the shaft furnace 6 to carry out reduction reaction with the iron ore, and the energy consumption is low.
The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.
Claims (13)
1. The utility model provides a purify coke oven gas preparation gas base shaft furnace reducing gas system, which characterized in that includes coke oven gas purifier (1) that carries out purification treatment to coke oven gas, turns into reducing gas converter (2) of reducing gas with coke oven gas after purifying to and carry out purification treatment's top gas purifier (3) to the top gas of stove (6) discharge, wherein:
the gas inlet of the coke oven gas purification device (1) is connected with a coke oven gas pipeline, the gas outlet of the coke oven gas purification device (1) is respectively connected with the fuel gas inlet (203) of the reducing gas conversion furnace (2) and the raw gas inlet (201) of the reducing gas conversion furnace (2), the reducing gas outlet (202) of the reducing gas conversion furnace (2) is connected with the reducing gas inlet (602) of the shaft furnace (6), the top gas outlet (601) of the shaft furnace (6) is connected with the gas inlet of the top gas purification device (3), and the gas outlet of the top gas purification device (3) is respectively connected with the fuel gas inlet (203) of the reducing gas conversion furnace (2) and the raw gas inlet (201) of the reducing gas conversion furnace (2).
2. The system for preparing gas-based shaft furnace reducing gas by purifying coke oven gas as claimed in claim 1, the coke oven gas purification device (1) comprises a dust removal device (101), a tar removal device (102), a naphthalene removal device (103), an organic sulfur removal device (104) and an inorganic sulfur removal device (105), the gas inlet of the dust removing device (101) is connected with a coke oven gas pipeline, the gas outlet of the dust removing device (101) is connected with the gas inlet of the tar removing device (102), the gas outlet of the tar removing device (102) is connected with the gas inlet of the naphthalene removing device (103), the air outlet of the naphthalene removing device (103) is connected with the air inlet of the organic sulfur removing device (104), the air outlet of the organic sulfur removal device (104) is connected with the air inlet of the inorganic sulfur removal device (105), the gas outlet of the inorganic sulfur removal device (105) is connected with the fuel gas inlet (203) of the reducing gas reformer (2);
the gas inlet of the dust removing device (101) is the gas inlet of the coke oven gas purification device (1), and the gas outlet of the inorganic sulfur removing device (105) is the gas outlet of the coke oven gas purification device (1).
3. The system for purifying coke oven gas for preparing gas-based shaft furnace reducing gas according to claim 1, further comprising a heat recovery device (4) for preheating and heating the process gas discharged from the top gas purification device (3), wherein the gas outlet of the top gas purification device (3) is connected to the fuel gas inlet (203) of the reducing gas conversion furnace (2) and the raw gas inlet (201) of the reducing gas conversion furnace (2) through the heat recovery device (4), and the gas outlet of the coke oven gas purification device (1) is connected to the raw gas inlet (201) of the reducing gas conversion furnace (2) through the heat recovery device (4).
4. The system for purifying coke oven gas for preparing gas based shaft furnace reducing gas of claim 3, wherein the flue gas outlet of the reducing gas reformer (2) is connected with the flue gas inlet of the heat recovery device (4), and the flue gas outlet of the heat recovery device (4) is directly communicated with the outside.
5. The system for purifying coke oven gas for producing gas-based shaft furnace reducing gas according to claim 3, wherein a pressurizing device (5) for adjusting gas transmission pressure is provided between the gas outlet of the top gas purifying device (3) and the raw gas inlet (201) of the reducing gas reformer (2).
6. The system for purifying coke oven gas to prepare gas-based shaft furnace reducing gas according to claim 3, wherein the top gas purification device (3) comprises a heat exchanger (301), a scrubber (302) and an adsorption desulfurization tower (303), wherein a gas inlet of the heat exchanger (301) is connected with a top gas outlet (601) of the shaft furnace (6), a gas outlet of the heat exchanger (301) is connected with a gas inlet of the scrubber (302), a gas outlet of the scrubber (302) is connected with a gas inlet of the adsorption desulfurization tower (303), and a gas outlet of the adsorption desulfurization tower (303) is respectively connected with a fuel gas inlet (203) of the reducing gas converter (2) and a raw gas inlet (201) of the reducing gas converter (2);
the air inlet of the heat exchanger (301) is the air inlet of the furnace top gas purification device (3), and the air outlet of the adsorption desulfurization tower (303) is the air outlet of the furnace top gas purification device (3).
7. The system for purifying coke oven gas for producing gas-based shaft furnace reducing gas according to claim 6, wherein the desorption gas outlet of the adsorption desulfurization tower (303) is connected to the desorption gas inlet of the heat exchanger (301), and the desorption gas outlet of the heat exchanger (301) is connected to the desorption gas inlet of the adsorption desulfurization tower (303).
8. The system for the clean coke oven gas preparation gas based shaft furnace reducing gas of claim 6, characterized in that the desorbed gas outlet of the adsorption desulfurization tower (303) is connected to the fuel gas inlet (203) of the reducing gas reformer (2) through the heat recovery device (4).
9. The system for purifying coke oven gas for producing gas-based shaft furnace reducing gas according to claim 6, wherein the adsorption desulfurization tower (303) is filled with a molecular sieve material which can adsorb organic sulfur and inorganic sulfur contained in the top gas and can be desorbed and regenerated after heating.
10. The system for purifying coke oven gas for producing gas based shaft furnace reducing gas according to claim 6, wherein the number of the adsorption desulfurization tower (303) is plural, and at least one of the adsorption desulfurization towers (303) is a spare adsorption desulfurization tower.
11. The system for purifying coke oven gas to prepare gas-based shaft furnace reducing gas according to claim 1, wherein a plurality of catalyst tubes (205) for catalytically reforming the raw gas discharged from the coke oven gas purification device (1) and the process gas discharged from the top gas purification device (3) into reducing gas required for reducing iron ore are disposed inside the reducing gas converter (2), and each catalyst tube (205) is connected in parallel between the raw gas inlet (201) of the reducing gas converter (2) and the reducing gas outlet (202) of the reducing gas converter (2).
12. The system for preparing gas-based shaft furnace reducing gas by purifying coke oven gas according to claim 11, wherein the catalyst tube (205) is filled with a nickel-based catalyst.
13. The system for the clean coke oven gas preparation gas-based shaft furnace reducing gas of claim 1, characterized in that the top gas outlet (601) is arranged at the top of the shaft furnace (6), and an iron ore inlet (603) is arranged at the top of the shaft furnace (6) and above the top gas outlet (601);
the reducing gas inlet (602) is arranged at the bottom of the shaft furnace (6), and a sponge iron outlet (604) is arranged at the bottom of the shaft furnace (6) and below the reducing gas inlet (602).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022850825.6U CN213895738U (en) | 2020-12-02 | 2020-12-02 | System for preparing gas-based shaft furnace reducing gas by purifying coke oven gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022850825.6U CN213895738U (en) | 2020-12-02 | 2020-12-02 | System for preparing gas-based shaft furnace reducing gas by purifying coke oven gas |
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| CN213895738U true CN213895738U (en) | 2021-08-06 |
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