CN107337179B - Preparation system and method of reducing gas of gas-based shaft furnace - Google Patents
Preparation system and method of reducing gas of gas-based shaft furnace Download PDFInfo
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- CN107337179B CN107337179B CN201710676084.4A CN201710676084A CN107337179B CN 107337179 B CN107337179 B CN 107337179B CN 201710676084 A CN201710676084 A CN 201710676084A CN 107337179 B CN107337179 B CN 107337179B
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- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/32—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
- C01B3/34—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents
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- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
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- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
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- C01B2203/02—Processes for making hydrogen or synthesis gas
- C01B2203/0205—Processes for making hydrogen or synthesis gas containing a reforming step
- C01B2203/0227—Processes for making hydrogen or synthesis gas containing a reforming step containing a catalytic reforming step
- C01B2203/0238—Processes for making hydrogen or synthesis gas containing a reforming step containing a catalytic reforming step the reforming step being a carbon dioxide reforming step
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- C01B2203/08—Methods of heating or cooling
- C01B2203/0805—Methods of heating the process for making hydrogen or synthesis gas
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- C01B2203/1041—Composition of the catalyst
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- C01B2203/12—Feeding the process for making hydrogen or synthesis gas
- C01B2203/1205—Composition of the feed
- C01B2203/1211—Organic compounds or organic mixtures used in the process for making hydrogen or synthesis gas
- C01B2203/1235—Hydrocarbons
- C01B2203/1241—Natural gas or methane
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Abstract
The invention provides a preparation system and a preparation method of reducing gas of a gas-based shaft furnace, comprising a gas-based shaft furnace top gas scrubber, a top gas decarburization device, a coke oven gas purification device, a coke oven gas desulfurization device, a reformer, a heat recovery device, a synthesis gas dust removal device, a synthesis gas desulfurization and decarburization device and a mixer. The invention combines the coke oven gas and the gasification furnace synthesis gas, fully utilizes the effective gas components in the coke oven gas and the high temperature characteristic of the synthesis gas, produces the reducing gas for directly reducing iron, and has the advantages of flexible and adjustable gas components, high thermal efficiency, low cost, good product gas quality and the like.
Description
Technical Field
The invention relates to a preparation system and a preparation method of gas-based shaft furnace reducing gas, and belongs to the technical field of ferrous metallurgy.
Background
The blast furnace ironmaking process and the converter are combined together to form a steel production flow with high efficiency and huge scale, and the blast furnace ironmaking process and the converter are the main forces of steel production in the world. However, due to the characteristics of long flow, high energy consumption, heavy pollution, coke consumption and the like, development space is gradually limited, the world is started to turn to a non-blast furnace steelmaking technology, and an electric furnace short-flow steelmaking technology using scrap steel and direct reduced iron as raw materials is developed, so that the method is an environment-friendly and resource-saving steelmaking technology. In this technology, the direct reduced iron can dilute impurities such as carbon, copper, manganese, and zinc existing in scrap steel, and the market demand is particularly large in developed countries in europe and america. Currently advanced direct reduced iron in the worldThe technology is a direct reduction technology of a gas-based shaft furnace, which mainly uses natural gas as raw material and transforms the natural gas into H-rich gas 2 And CO gas, and directly carrying out solid reduction with iron ore at high temperature to produce sponge iron. Because of the lack of natural gas resources in China, the development of a gas-based shaft furnace reduction technology is limited. The method has the advantages that the coal resources in China are relatively rich, the coal gasification gas production and the original coke oven gas combined production of the steel mill are developed, and the method is used for producing the sponge iron by the gas-based shaft furnace, is a preferable technical route which accords with the conditions of China, and is an important direction suitable for developing novel iron-making technology in China.
In general, the requirement of the reduction gas for the direct reduction iron making of the shaft furnace is H 2 The total volume fraction with CO is greater than 90%,
1.0-5.0 MPa, and 0.15-0.60 MPa. The existing coal gasification process can not directly provide gas components meeting requirements, a conversion device is needed to adjust the gas components, and the defects of high gasifier pressure, severe raw material requirements, high gas production cost, high energy consumption and the like generally exist.
The coke oven gas resources in China are rich, and the subsequent utilization process is not matched, so that a large amount of coke oven gas is wasted. The coke oven gas contains 50% -60% of hydrogen and more than 20% of methane.
In view of the actual needs, there is a need in the art to find a system and a method for preparing a gas-based shaft furnace reducing gas suitable for the situations of China.
Disclosure of Invention
In order to solve the technical problems, the main purpose of the invention is to provide a reducing gas preparation system of a gas-based shaft furnace, which can be used for effectively combining coal gas and coke oven gas to prepare the reducing gas for the gas-based shaft furnace.
It is still another object of the present invention to provide a method for producing a reducing gas in a gas-based shaft furnace using the aforementioned production system.
In order to achieve the above object, the present invention provides a system for preparing a reducing gas of a gas-based shaft furnace, wherein the preparing system comprises a gas-based shaft furnace top gas scrubber, a top gas decarbonization device, a coke oven gas purification device, a coke oven gas desulfurization device, a reformer, a heat recovery device, a synthesis gas dust removal device, a synthesis gas desulfurization decarbonization device and a mixer;
the reformer comprises a closed shell, wherein a catalyst pipe is arranged in the closed shell, the inlet end of the catalyst pipe is used as a raw material gas inlet of the reformer, the outlet end of the catalyst pipe is used as a conversion gas outlet of the reformer, a synthesis gas inlet and a synthesis gas outlet are also arranged on the closed shell, and the synthesis gas inlet is used as an inlet of a synthesis gas inlet system (after entering the closed shell, heat is provided for reaction in the catalyst pipe firstly, and generally the synthesis gas passes through the side surface of the catalyst pipe);
the heat recovery device is a heat exchanger and is provided with a hot crude synthetic gas inlet, a hot crude synthetic gas outlet, a cold refined synthetic gas inlet, a cold refined synthetic gas outlet, a cold raw material gas inlet and a cold raw material gas outlet;
the inlet of the coke oven gas purifying device is used as an inlet of a coke oven gas entering system, the outlet of the coke oven gas purifying device is connected with the inlet of the coke oven gas desulfurizing device, the outlet of the coke oven gas desulfurizing device is connected with the cold raw material gas inlet through a pipeline, the cold raw material gas outlet is connected with the raw material gas inlet of the reformer, and the conversion gas outlet is connected with the inlet of the mixer;
the inlet of the gas-based shaft furnace top gas scrubber is used as an inlet of a top gas entering system, the outlet of the gas-based shaft furnace top gas scrubber is connected with the inlet of the top gas decarburization device, and meanwhile, the outlet of the gas-based shaft furnace top gas scrubber is connected to a pipeline between the outlet of the coke oven gas desulfurization device and the inlet of the cold fluid raw material gas through a pipeline, and the outlet of the top gas decarburization device is connected with the inlet of the mixer;
the synthesis gas outlet of the reformer is connected with the hot crude synthesis gas inlet, the hot crude synthesis gas outlet is connected with the inlet of the synthesis gas dust removal device, the outlet of the synthesis gas dust removal device is connected with the inlet of the synthesis gas desulfurization and decarbonization device, the outlet of the synthesis gas desulfurization and decarbonization device is connected with the cold refined synthesis gas inlet, and the cold refined synthesis gas outlet is connected with the inlet of the mixer;
the outlet of the mixer is used as the outlet of the reducing gas of the gas-based shaft furnace.
By adopting the preparation system, the synthesis gas and the coke oven gas which are prepared from coal can be combined, and the advantages of the synthesis gas and the coke oven gas are complementary to produce the reducing gas which meets the requirements of the shaft furnace. The technology can fully utilize coke oven gas resources of the steel mill, has the advantages of producing high-temperature gas by the gasifier, greatly reduces the cost of directly reducing iron, has small energy consumption and flexible and adjustable gas components, and is a very promising technical route for upgrading, reforming and improving the product quality of the steel mill.
The preparation system of the invention can also comprise a gas-based shaft furnace, wherein the furnace body of the gas-based shaft furnace is provided with an iron ore feeding port, a direct reduced iron outlet, a reducing gas inlet and a top gas outlet; the top gas outlet is connected to the inlet of the gas-based shaft furnace top gas scrubber. In the gas-based shaft furnace, iron ore (such as pellets or lumps) enters from the upper part of the shaft furnace, reducing gas flows from bottom to top, the reduction reaction of the iron ore occurs, the reaction temperature is generally 850-1000 ℃, sponge iron and top gas are obtained, direct reduced iron is discharged from a direct reduced iron outlet, and top gas is discharged from a top gas outlet.
The preparation system of the invention can also comprise a temperature rising device; the outlet of the mixer is connected with the inlet of the heating device, and the outlet of the heating device is connected with the reducing gas inlet.
The preparation system of the invention can also comprise a coal gasifier, wherein the coal gasifier is provided with a synthetic gas outlet, and the synthetic gas outlet of the coal gasifier is connected with the synthetic gas inlet of the reformer; preferably, the coal gasifier is an entrained flow gasifier. It should be noted that the coal gasifier may be another type of gasifier. In the coal gasifier, coal undergoes oxidation-reduction reaction under high temperature conditions to produce high temperature synthesis gas. The high-temperature synthesis gas provides heat for the reformer, reduces sensible heat of the synthesis gas, and saves energy.
The preparation system of the invention can also comprise a coke oven which is provided with a coke oven gas outlet which is connected with the inlet of the coke oven gas purifying device.
The above-described preparation system of the present invention may include the various components described above.
As a specific embodiment of the above preparation system of the present invention, preferably, the synthesis gas dust removal device is a dry dust removal device. The synthetic gas enters a desulfurization and decarbonization device after dust removal, and enters a mixer after temperature rise.
As a specific embodiment of the above-described preparation system of the present invention, preferably, the catalyst tubes are plural and are arranged in parallel.
The catalyst that may be employed in the catalyst tubes of the present invention is a nickel-based catalyst. Which is an existing catalyst.
On the other hand, the invention provides a preparation method of the reducing gas of the gas-based shaft furnace, which adopts the preparation system and comprises the following steps:
the coke oven gas from the coke oven passes through the coke oven gas purifying device and the coke oven gas desulfurizing device to remove dust, tar and sulfur to obtain purified coke oven gas;
after entering a gas-based shaft furnace top gas scrubber to remove dust and cool, part of top gas from the gas-based shaft furnace enters the gas-based shaft furnace top gas scrubber to remove carbon dioxide, and then enters the mixer, and the other part of top gas is mixed with the purified coke oven gas to be used as raw gas, the raw gas is preheated by the heat recovery device and enters the catalyst tube, and catalytic reforming reaction occurs in the catalyst tube to obtain the H-enriched gas 2 And a shift gas of CO, the shift gas entering the mixer;
the synthesis gas from the coal gasifier firstly enters the reformer through a synthesis gas inlet of the reformer to provide heat for the catalytic reforming reaction, the synthesis gas after providing heat enters the heat recovery device to serve as a heat source, the synthesis gas enters the synthesis gas dust removal device and the desulfurization and decarbonization device after heat exchange and cooling again, refined synthesis gas is obtained after dust removal, desulfurization and decarbonization, and the refined synthesis gas enters the mixer after being heated by the heat recovery device;
enter the saidSaid H-enriched mixer 2 Mixing with CO conversion gas, refined synthetic gas and decarbonized top gas in a mixer to regulate temperature and gas components, and obtaining reducing gas.
In the catalytic reforming reaction of the invention, CH in coke oven gas 4 、CO 2 And CO in top gas 2 Reformed as feedstock to be rich in CO and H 2 The temperature of the high-temperature conversion gas is 800-1000 ℃. This makes the resource allocation reasonable and reduces CO 2 Is arranged in the air. The catalytic reforming reaction is an endothermic reaction at 800-1000 deg.c, and the heat required is from the high temperature synthesis gas produced in the coal gasifier.
The invention is from the high temperature synthesis gas generated by gasification furnace, the temperature is 1000-1300 ℃. The synthetic gas which enters the reformer provides heat for the catalytic reforming of coke oven gas, saves energy, enters the heat recovery device from the reformer, enters the desulfurization and decarbonization device from the heat recovery device after dust removal, enters the heat recovery device after purification, and enters the mixer after heating.
In the heat recovery device unit, heat is derived from waste heat of the synthesis gas, and the refined synthesis gas, raw gas and the like can be preheated.
In the synthetic gas desulfurization and decarbonization unit, the synthetic gas with lower temperature is cooled and desulfurized and decarbonized to obtain high CO and H 2 Is a refined synthesis gas of (a).
As a specific embodiment of the above-described production method of the present invention, it is preferable that the volume of the gas introduced into the top gas decarburization device is 60% to 90% of the total volume.
As a specific embodiment of the above-described production method of the present invention, it is preferable that the volume ratio of the top gas as the raw material gas to the purified coke oven gas is 1 to 5:1.
As a specific embodiment of the above preparation method of the present invention, preferably, the volume ratio of the synthesis gas entering the reformer to the raw material gas entering the catalyst tube is 1 to 3:1.
As a specific embodiment of the above-described production method of the present invention, it is preferable that the reducing gas obtained after mixing by the mixer is heated to 850 to 1000 ℃ using a temperature raising device.
The innovation and beneficial effects of the gas making system and the gas making method provided by the invention comprise:
(1) The reducing gas preparation system and method of the gas-based shaft furnace combine coke oven gas and gasified synthetic gas, the gas components are flexible and adjustable, the sensible heat of the synthetic gas is fully utilized, the cost is low, and the heat efficiency is high;
(2) According to the reducing gas preparation system and method of the gas-based shaft furnace, the high-temperature synthetic gas generated by the gasification furnace provides heat for the reformer, and the reformer is cooled by the heat recovery device, so that compared with the prior art, the reducing temperature, desulfurizing and decarbonizing before the temperature is raised, the energy consumption is greatly reduced.
(3) The reducing gas preparation system and method of the gas-based shaft furnace can directly use the produced reducing gas for direct reduction iron making, does not need a CO conversion device, and has reasonable resource allocation.
In summary, the invention mainly provides a preparation system and a method for direct reduction iron making of a gas-based shaft furnace, which take coal gasification synthetic gas and coke oven gas as gas sources, and utilize the two gases to prepare high-grade shaft furnace reducing gas in a combined way, thereby providing a novel gas preparation method for direct reduction iron making. The invention combines the coke oven gas and the gasification furnace synthesis gas, fully utilizes the effective gas components in the coke oven gas and the high temperature characteristic of the synthesis gas, produces the reducing gas for directly reducing iron, and has the advantages of flexible and adjustable gas components, high thermal efficiency, low cost, good product gas quality and the like.
Drawings
Fig. 1 is a schematic diagram of a reducing gas preparation system of a gas-based shaft furnace provided in embodiment 1 of the present invention, in which the flow direction of materials is shown, and the symbols in the drawings have the following meanings:
1: iron ore feed inlet; 2: a gas-based shaft furnace; 3: a top gas outlet; 4: a reducing gas inlet; 5: a direct reduced iron outlet; 6: a gas-based shaft furnace top gas scrubber; 7: a coke oven gas purifying device; 8: a coke oven gas desulfurization device; 9: a reformer; 10: a coal gasifier; 11: a dry dust removal device; 12: a mixer; 13: a heat recovery device; 131: a hot raw synthesis gas inlet; 132: a hot raw synthesis gas outlet; 133: a cold refined synthesis gas inlet; 134: a cold refined synthesis gas outlet; 14: a synthetic gas desulfurization and decarbonization device; 15: a shift gas outlet; 16: a synthesis gas inlet; 17: a synthesis gas outlet; 18: a catalyst tube; 19: a feed gas inlet; 20: a temperature raising device; 21: a furnace top gas decarburization device.
Detailed Description
In order to more clearly understand the technical features, objects and advantages of the present invention, the following detailed description will be made with reference to specific embodiments thereof, and it should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. In the examples, each of the starting reagent materials is commercially available, and the experimental methods without specifying the specific conditions are conventional methods and conventional conditions well known in the art, or according to the conditions recommended by the instrument manufacturer.
Example 1
Referring to fig. 1, the preparation system of the embodiment includes a gas-based shaft furnace 2, a gas-based shaft furnace top gas scrubber 6, a top gas decarbonization device 21, a coke oven gas purification device 7, a coke oven gas desulfurization device 8, a reformer 9, a coal gasifier 10, a heat recovery device 13, a synthesis gas dust removal device (dry dust removal device 11), a synthesis gas desulfurization decarbonization device 14, a mixer 12, and a temperature raising device 20;
the furnace body of the gas-based shaft furnace 2 is provided with an iron ore feeding port 1, a direct reduced iron outlet 5, a reducing gas inlet 4 and a top gas outlet 3; the top gas outlet 3 is connected to the inlet of the gas-based shaft furnace top gas scrubber 6;
the reformer 9 comprises a closed shell, a plurality of catalyst pipes are arranged in the closed shell, the catalyst pipes are arranged in parallel, the inlet ends of the catalyst pipes are used as a raw material gas inlet 19 of the reformer 9, the outlet ends of the catalyst pipes are used as a conversion gas outlet 15 of the reformer 9, a synthetic gas inlet 16 and a synthetic gas outlet 17 are also arranged on the closed shell, and the synthetic gas inlet 16 is used as an inlet of a synthetic gas inlet system and provides heat for the reaction in the catalyst pipes;
the heat recovery device 13 is a heat exchanger, which is provided with a hot raw syngas inlet 131 and a hot raw syngas outlet 132, a cold refined syngas inlet 133 and a cold refined syngas outlet 134, and a cold raw gas inlet and a cold raw gas outlet (not shown in the figure);
the inlet of the coke oven gas purifying device 7 is used as an inlet of a coke oven gas entering system, the outlet of the coke oven gas purifying device 7 is connected with the inlet of the coke oven gas desulfurizing device 8, the outlet of the coke oven gas desulfurizing device 8 is connected with the cold raw material gas inlet through a pipeline, the cold raw material gas outlet is connected with the raw material gas inlet 19 of the reformer 9, and the conversion gas outlet 15 is connected with the inlet of the mixer 12;
the inlet of the gas-based shaft furnace top gas scrubber is used as the inlet of a top gas entering system, the outlet of the gas-based shaft furnace top gas scrubber 2 is connected with the inlet of the top gas decarburization device 21, meanwhile, the outlet of the gas-based shaft furnace top gas scrubber 2 is connected on a pipeline between the outlet of the coke oven gas desulfurization device 8 and the cold fluid raw material gas inlet through a pipeline, and the outlet of the top gas decarburization device 21 is connected with the inlet of the mixer 2;
the synthesis gas outlet 17 of the reformer 9 is connected with the hot raw synthesis gas inlet 131, the hot raw synthesis gas outlet 132 is connected with the inlet of the dry dust removal device 11, the outlet of the dry dust removal device 11 is connected with the inlet of the synthesis gas desulfurization and decarbonization device 14, the outlet of the synthesis gas desulfurization and decarbonization device 14 is connected with the cold refined synthesis gas inlet 133, and the cold refined synthesis gas outlet 134 is connected with the inlet of the mixer 12;
the outlet of the mixer 12 is used as the outlet of the reducing gas of the gas-based shaft furnace, and is connected with the inlet of the temperature rising device 20, and the outlet of the temperature rising device 20 is connected with the reducing gas inlet 4;
the coal gasifier 10 is provided with a synthesis gas outlet, and the synthesis gas outlet of the coal gasifier 10 is connected with a synthesis gas inlet 16 of the reformer 9;
the system also comprises a coke oven (not shown in the figures) provided with a coke oven gas outlet connected to the inlet of said coke oven gas cleaning device 7.
The preparation method of the reducing gas of the gas-based shaft furnace adopts the system, and comprises the following steps:
the coke oven gas from the coke oven is subjected to dust removal, tar removal and desulfurization by the coke oven gas purifying device 7 and the coke oven gas desulfurizing device 8 to obtain purified coke oven gas, and the coke oven gas comprises the following components of H 2 59.9％，CO 5.8％，CO 2 2.0％，CH 4 24.3％，N 2 7.6％，O 2 0.4%; the temperature was 40 ℃.
After the iron ore is processed into pellets or lump ore, feeding from an iron ore feed inlet 1 at the upper part of the gas-based shaft furnace 2, reversely flowing reducing gas, and carrying out reduction reaction at 970 ℃ to obtain sponge iron and top gas, wherein the temperature of the top gas is 400 ℃, and the components are as follows: h 2 56.5％，CO 8.4％，CO 2 8.2％，CH 4 4.1％，N 2 0.5％，H 2 O22.4%, dust content 2.6g/Nm 3 . The top gas is discharged from the top gas outlet 3 into the gas-based shaft furnace top gas scrubber 6, after cooling and dust removal, 80% of the total top gas volume is fed into the top gas decarbonization device 21, after removal of carbon dioxide, into the mixer 20, after decarbonization, the top gas components: h 2 77.5％，CO 11.3％，CO 2 1.5％，CH 4 7.4％，N 2 0.8％，H 2 O1.5%; the other part of the top gas is mixed with the raw gas of the purified coke oven gas according to the volume ratio of 1.2:1, the temperature is 40 ℃, and the components are as follows: h 2 66.2％，CO 8.4％，CO 2 6.6％，CH 4 13.9％，N 2 3.8％，O 2 0.2％，H 2 O0.9%; after preheating to 600 ℃ in the heat recovery device 13, the raw material gas enters a parallel catalyst pipe 18 from a raw material gas inlet 19 of the reformer 9, and nickel-based catalyst is filled in the pipe;
the raw material gas is subjected to reforming reaction under the action of the catalyst in the catalyst tube 18 to convert CH 4 And CO 2 Reforming to H 2 And CO, provided thatThe converted gas is discharged from the converted gas outlet 15 into the mixer 12, the temperature of the converted gas being 850 ℃, the composition being: h 2 75.5％，CO 17.6％，CO 2 1.3％，CH 4 1.4％，N 2 3.5％，H 2 O0.7%; the catalyst tubes 18 in the reformer 9 are heated by the external synthesis gas.
In the coal gasification furnace (preferably, an entrained flow gasification furnace) 10, coal undergoes oxidation-reduction reaction at high temperature to generate synthesis gas, wherein the temperature of the synthesis gas is 1200 ℃, and the components are as follows: h 2 21.3％，CO 74.4％，CO 2 3.4％，CH 4 0.1％，N 2 0.7%. The high-temperature synthesis gas enters the reformer 9 through the synthesis gas inlet 16 of the reformer 9 to provide heat for the catalytic reforming reaction, the temperature of the synthesis gas after providing heat is reduced to 900 ℃, the synthesis gas enters the heat recovery device 13 as a heat source, the temperature is reduced to 450 ℃ after being subjected to heat exchange and cooling again, the synthesis gas enters the dry dust removal device 11, the synthesis gas after dry dust removal enters the desulfurization and decarbonization device 14, the synthesis gas after desulfurization and decarbonization becomes refined synthesis gas, the temperature is 40 ℃, the synthesis gas is heated to 400 ℃ again in the heat recovery device 13, and the synthesis gas enters the mixer 12.
H-enriched feed to the mixer 12 2 And CO shift gas (H) 2 75.5％，CO 17.6％，CO 2 1.3％，CH 4 1.4％，N 2 3.5％，H 2 O0.7%), refined synthesis gas (H) 2 21.3％，CO 74.4％，CO 2 3.4％，CH 4 0.1％，N 2 0.7%), decarbonized top gas (H) 2 77.5％，CO 11.3％，CO 2 1.5％，CH 4 7.4％，N 2 0.8％，H 2 O1.5%) in a mixer, mixing and regulating the temperature and the gas components in the ratio of: 1:1.5:3, the resulting reducing gas composition was: h 2 61.8％，CO 29.7％，CO 2 2.0％，CH 4 4.3％，N 2 1.3％，H 2 O0.9%, the temperature is 300 ℃, and the reducing gas for direct reduction ironmaking is obtained, and enters the temperature rising device 20, and enters the gas-based shaft furnace from the reducing gas inlet after the temperature rises to 930 ℃.
The last explanation is: the above embodiments are only for illustrating the implementation procedure and features of the present invention, and not for limiting the technical solution of the present invention, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention, and any modifications and equivalents are intended to be included within the scope of the present invention.
Claims (13)
1. The preparation system comprises a gas-based shaft furnace top gas scrubber, a top gas decarburization device, a coke oven gas purification device, a coke oven gas desulfurization device, a reformer, a heat recovery device, a synthesis gas dust removal device, a synthesis gas desulfurization and decarburization device and a mixer;
the reformer comprises a closed shell, wherein a catalyst pipe is arranged in the closed shell, the inlet end of the catalyst pipe is used as a raw material gas inlet of the reformer, the outlet end of the catalyst pipe is used as a conversion gas outlet of the reformer, a synthesis gas inlet and a synthesis gas outlet are also arranged on the closed shell, and the synthesis gas inlet is used as an inlet of a synthesis gas inlet system;
the heat recovery device is a heat exchanger and is provided with a hot crude synthetic gas inlet, a hot crude synthetic gas outlet, a cold refined synthetic gas inlet, a cold refined synthetic gas outlet, a cold raw material gas inlet and a cold raw material gas outlet;
the inlet of the coke oven gas purifying device is used as an inlet of a coke oven gas entering system, the outlet of the coke oven gas purifying device is connected with the inlet of the coke oven gas desulfurizing device, the outlet of the coke oven gas desulfurizing device is connected with the cold raw material gas inlet through a pipeline, the cold raw material gas outlet is connected with the raw material gas inlet of the reformer, and the conversion gas outlet is connected with the inlet of the mixer;
the inlet of the gas-based shaft furnace top gas scrubber is used as an inlet of a top gas entering system, the outlet of the gas-based shaft furnace top gas scrubber is connected with the inlet of the top gas decarburization device, and meanwhile, the outlet of the gas-based shaft furnace top gas scrubber is connected to a pipeline between the outlet of the coke oven gas desulfurization device and the cold raw material gas inlet through a pipeline, and the outlet of the top gas decarburization device is connected with the inlet of the mixer;
the synthesis gas outlet of the reformer is connected with the hot crude synthesis gas inlet, the hot crude synthesis gas outlet is connected with the inlet of the synthesis gas dust removal device, the outlet of the synthesis gas dust removal device is connected with the inlet of the synthesis gas desulfurization and decarbonization device, the outlet of the synthesis gas desulfurization and decarbonization device is connected with the cold refined synthesis gas inlet, and the cold refined synthesis gas outlet is connected with the inlet of the mixer;
the outlet of the mixer is used as the outlet of the reducing gas of the gas-based shaft furnace.
2. The production system of a reducing gas of a gas-based shaft furnace according to claim 1, wherein the production system further comprises a gas-based shaft furnace, the furnace body of which is provided with an iron ore feed port, a direct reduced iron outlet, a reducing gas inlet and a top gas outlet; the top gas outlet is connected to the inlet of the gas-based shaft furnace top gas scrubber.
3. The system for producing a reducing gas of a gas-based shaft furnace according to claim 2, wherein the system further comprises a temperature raising device; the outlet of the mixer is connected with the inlet of the heating device, and the outlet of the heating device is connected with the reducing gas inlet.
4. The system for producing a reducing gas of a gas-based shaft furnace according to claim 1, wherein the system further comprises a coal gasifier provided with a synthesis gas outlet connected to the synthesis gas inlet of the reformer.
5. The system for producing a reducing gas in a gas-based shaft furnace according to claim 4, wherein the coal gasifier is an entrained-flow gasifier.
6. The system for preparing a gas-based shaft furnace reducing gas according to claim 1, wherein the system further comprises a coke oven provided with a coke oven gas outlet connected to the inlet of the coke oven gas cleaning device.
7. The system for producing a reducing gas of a gas-based shaft furnace according to any one of claims 1 to 6, wherein the synthesis gas dust removal device is a dry dust removal device.
8. The production system for a gas-based shaft furnace reducing gas according to any one of claims 1 to 6, wherein the catalyst tubes are provided in a plurality of parallel.
9. A method of producing a reducing gas of a gas-based shaft furnace, the method employing the production system according to any one of claims 1 to 8, comprising the steps of:
the coke oven gas from the coke oven passes through the coke oven gas purifying device and the coke oven gas desulfurizing device to remove dust, tar and sulfur to obtain purified coke oven gas;
after entering a gas-based shaft furnace top gas scrubber to remove dust and cool, part of top gas from the gas-based shaft furnace enters the gas-based shaft furnace top gas scrubber to remove carbon dioxide, and then enters the mixer, and the other part of top gas is mixed with the purified coke oven gas to be used as raw gas, the raw gas is preheated by the heat recovery device and enters the catalyst tube, and catalytic reforming reaction occurs in the catalyst tube to obtain the H-enriched gas 2 And a shift gas of CO, the shift gas entering the mixer;
the synthesis gas from the coal gasifier firstly enters the reformer through a synthesis gas inlet of the reformer to provide heat for the catalytic reforming reaction, the synthesis gas after providing heat enters the heat recovery device to serve as a heat source, the synthesis gas enters the synthesis gas dust removal device and the desulfurization and decarbonization device after heat exchange and cooling again, refined synthesis gas is obtained after dust removal, desulfurization and decarbonization, and the refined synthesis gas enters the mixer after being heated by the heat recovery device;
the H-enriched feed to the mixer 2 Mixing with CO conversion gas, refined synthetic gas and decarbonized top gas in a mixer to regulate temperature and gas components, and obtaining reducing gas.
10. The method of producing a gas-based shaft furnace reducing gas according to claim 9, wherein the volume of gas entering the top gas decarbonization device is 60% -90% of the total volume.
11. The method for producing a gas-based shaft furnace reducing gas according to claim 9, wherein a volume ratio of top gas as the raw material gas to the purified coke oven gas is 1 to 5:1.
12. The method for producing a gas-based shaft furnace reducing gas according to claim 9, wherein a volume ratio of the synthesis gas entering the reformer to the raw material gas entering the catalyst tube is 1 to 3:1.
13. The method for producing a reducing gas in a gas-based shaft furnace according to claim 9, wherein the reducing gas obtained by mixing in the mixer is heated to 850 to 1000 ℃ by a heating device.
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| CN107893143B (en) * | 2017-12-18 | 2023-01-13 | 北京京诚泽宇能源环保工程技术有限公司 | Converter gas dry dedusting waste heat recovery system and process |
| CN111363874A (en) * | 2018-12-25 | 2020-07-03 | 北京京诚泽宇能源环保工程技术有限公司 | System and method for preparing reducing gas of shaft furnace |
| CN114574647B (en) * | 2020-12-02 | 2023-10-03 | 北京京诚泽宇能源环保工程技术有限公司 | System and method for preparing shaft furnace reducing gas by coupling coke oven gas with carbon dioxide |
| CN114574648B (en) * | 2020-12-02 | 2023-10-31 | 北京京诚泽宇能源环保工程技术有限公司 | System and method for preparing reducing gas of gas-based shaft furnace |
| CN115522006A (en) * | 2021-06-25 | 2022-12-27 | 中晋冶金科技有限公司 | Gas-based direct reduction iron-making process for accelerating reaction |
| CN114807486A (en) * | 2022-03-31 | 2022-07-29 | 中晋冶金科技有限公司 | CO (carbon monoxide) 2 Oxidative coupling of CH 4 Method and device for converting hydrogen production base shaft furnace reducing gas |
| CN114774611A (en) * | 2022-03-31 | 2022-07-22 | 中晋冶金科技有限公司 | Hydrogen rich gas CO2Method for producing iron by oxidation conversion and hydrogen-based shaft furnace direct reduction |
| CN114672349A (en) * | 2022-04-15 | 2022-06-28 | 黑龙江建龙钢铁有限公司 | Reducing gas preparation system and method for applying biomass gas to gas-based shaft furnace |
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| JPS56123310A (en) * | 1980-02-28 | 1981-09-28 | Sumitomo Metal Ind Ltd | Integrated steel making method |
| AT511992B1 (en) * | 2011-09-29 | 2013-12-15 | Siemens Vai Metals Tech Gmbh | METHOD AND DEVICE FOR PRODUCING HYDROGEN FROM GASES INCORPORATED IN THE PRODUCTION OF REFRIGERATED IRON |
| CN203559070U (en) * | 2013-10-08 | 2014-04-23 | 中国石油大学(北京) | System for producing gas-base direct reduced iron |
| CN103525965B (en) * | 2013-10-08 | 2015-12-02 | 中国石油大学(北京) | Coke(oven)gas on-catalytic is utilized to transform the method and system of producing gas base directly reducing iron |
| CN203513711U (en) * | 2013-10-08 | 2014-04-02 | 中国石油大学(北京) | System for producing gas-base direct reduction iron from coke-oven gas |
| JP6167837B2 (en) * | 2013-10-15 | 2017-07-26 | 新日鐵住金株式会社 | Direct reduction method |
| CN207121422U (en) * | 2017-08-09 | 2018-03-20 | 北京京诚泽宇能源环保工程技术有限公司 | A kind of preparation system of gas-based shaft kiln also Primordial Qi |
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