CN108130105B - Metallurgical reduction coupling type coking and carbonization co-terminal coal pyrolysis process and system - Google Patents
Metallurgical reduction coupling type coking and carbonization co-terminal coal pyrolysis process and system Download PDFInfo
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- CN108130105B CN108130105B CN201810098767.0A CN201810098767A CN108130105B CN 108130105 B CN108130105 B CN 108130105B CN 201810098767 A CN201810098767 A CN 201810098767A CN 108130105 B CN108130105 B CN 108130105B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B1/00—Retorts
- C10B1/10—Rotary retorts
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/08—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form in the form of briquettes, lumps and the like
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
- C10B57/10—Drying
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
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Abstract
The invention provides a metallurgical reduction coupling type coking and carbonization co-dust coal pyrolysis process and system, which are characterized in that raw coal is divided into dust coal and dust coal with different particle size ranges, coke powder, semi-coke powder and coking coal are prepared into molded coal and molded coke by using a binder, ore is sieved to prepare granular ore, the dust ore is pressed into ore clusters, the molded coke is firstly paved at the bottom of a rotary hearth heating furnace, the granular ore and the ore clusters enter the rotary hearth heating furnace through a pre-reduction device and are uniformly paved on the molded coke, the rotary hearth heating furnace is heated by circulating coal and reduced residual coal to carbonize the molded coke, minerals are reduced simultaneously, the sensible heat medium-temperature dust coal of the carbonized molded coke and the reduced minerals is utilized to produce coal gas and coal tar, the waste gas of the rotary hearth heating furnace is utilized to bake and interfere with the molded coke, and the reduced minerals and the semicoke are subjected to dry distillation after the molded coal is baked, and the waste gas is subjected to protective circulation cooling. The invention is not limited by the grade of the raw materials, and can be widely used for cheap pulverized coal and high-grade and low-grade oxidized minerals.
Description
Technical Field
The invention relates to the technical field of coal chemical industry, in particular to a full-particle-size graded pyrolysis coupling metallurgical reduction process and system for coal.
Background
The Chinese coal reserves account for 12% of the global coal resources, the low-rank coal reserves account for about 50% of the coal reserves in China, and the yield accounts for 30% of the current total amount. According to the formation times of Chinese coal, the storage amount of dwarf coal is the largest, about 45% of the storage amount is found in China, and most of the coal formed in the times is low-rank coal such as lignite, long flame coal, non-caking coal, weak caking coal and the like except for a very small amount of anthracite. In regional distribution, most reserves are concentrated in six provinces (areas) of inner Mongolia, shanxi, xinjiang, gansu, shanxi and Ningxia, and the areas are places with serious shortage of water resources in China, so that the development of the processing and quality improvement industry by utilizing the low-rank coals is restricted to a certain extent.
The low-rank coal is unsuitable for long-term storage and long-distance transportation due to the characteristics of high moisture, high volatile matter, low heat value and extremely easy spontaneous combustion, and is regarded as a poor-quality coal resource for a long time, and is only used as a fuel and a pithead gasification raw material of a pithead power plant at present, so that reasonable development and utilization of the low-rank coal resource are limited. How to efficiently convert and utilize low-rank coal becomes an important problem of coal utilization.
Meanwhile, china is a large country for producing steel, so that the country is also a large country for utilizing scrap steel. The current supply of scrap steel is far from meeting the requirements of steel production. Although the iron ore resources in China are rich in reserves, the grade is low, and the prior process requires high-grade iron ore as a raw material, so that the rich low-grade iron ore resources in China are not suitable for being used as the raw material for the prior blast furnace ironmaking, and the China needs to rely on imported reduced iron for a long time to meet the domestic requirements. In order to change the situation that China depends on imported reduced iron for a long time, a technology for timely developing and utilizing low-grade iron ore for iron making is necessary. The trend of the current iron-making technology is to change from the indirect reduction iron-making technology of a blast furnace to the direct reduction iron-making technology, so that development of the direct reduction iron-making technology to develop low-grade iron ore is more necessary.
The low-grade oxidized mineral resources in China exist in a large quantity around the coal-rich area, and coal is a main source of reducing agents required in the field of metallurgical reduction, so that the development of the low-grade oxide ores around the coal-rich area by utilizing the coal pyrolysis technology coupled with the direct reduction metallurgical technology is an optimal scheme for developing the utilization of low-rank coal. The scheme solves the problem of high added value utilization of low-rank coal and the problem of development and utilization of rich low-grade oxide ores in China.
Currently, there are many technologies for coal pyrolysis coupled metallurgical reduction. The invention of publication No. CN103451332A, the invention discloses a system and a method for making iron by using small-grain bituminous coal in a blast furnace, the system comprises a pyrolysis furnace, a semicoke outlet of the pyrolysis furnace is communicated with an inlet of a crusher, an outlet of the crusher is communicated with an inlet of a vibrating screen, a fine coke powder outlet of the vibrating screen is communicated with a powder injection inlet of the blast furnace, a large-grain semicoke outlet of the vibrating screen is communicated with an inlet of a former, an outlet of the former is communicated with an inlet of a sintering furnace, an outlet of the sintering furnace is communicated with an inlet of sintered ore of the blast furnace, a flue gas outlet of the blast furnace is divided into two paths, one path is communicated with a gas inlet of the pyrolysis furnace, and the other path is communicated with a flue gas outlet of the pyrolysis furnace; solves the utilization problem of a large amount of small-particle-size coal generated by coal exploitation; the problem of shortage of coal resources for injection is relieved, and a path is provided for the utilization of coal pyrolysis semicoke; the semicoke powder and the iron ore powder are mixed, molded and sintered for use, so that the resources are fully utilized; the flue gas from blast furnace ironmaking is used for pyrolysis of bituminous coal, heat in the flue gas is recovered, energy consumption is reduced, and utilization efficiency is improved.
The invention with publication number of CN103710037 provides a low-rank coal fluidized bed upgrading and utilizing system and method. The invention couples the washing and selecting system, the pyrolysis system and the ironmaking system of the low-rank coal. The low-rank coal is firstly subjected to washing treatment, and the particle size classification of the coal is completed while gangue is discharged. The coal powder with different particle sizes is used for preparing coke by a coking system and participates in low-temperature pyrolysis to prepare semicoke. And the semicoke obtained by pyrolysis is respectively used for sintering coal and injection blending coal, pyrolysis byproduct coal gas is sent to a hot blast furnace for supplying combustion, wherein waste heat generated by a sintering and coking process system is recycled for a washing and selecting system and a pyrolysis system, and finally sintered ore, hot air, injection coal and coke are sent to a blast furnace for iron making. The invention realizes the sorting, grading, drying and pyrolysis of the low-rank coal, and the upgrading utilization of the low-rank coal replaces part of the high-rank coal, so that the cost of ton iron can be effectively reduced, and the pressure of the iron and steel industry on the requirement of the high-rank coal can be relieved.
The disadvantages of the above provided solution are:
1. the technology uses coke powder generated by pyrolysis of the granular coal as the injection coal of an iron-making blast furnace, the iron-making technology adopts the traditional blast furnace to indirectly reduce iron ore, pig iron with higher carbon content is obtained, the pig iron is used as a steelmaking raw material, and the pig iron can be used only through complex treatment procedures, so that the production cost is higher;
2. the flue gas at the outlet of the blast furnace is used as a heat source for pyrolysis, the pyrolysis gas generated in the pyrolysis process is diluted by the flue gas, the generated mixed gas has low heat value, the content of effective components is low, and the available value is low;
3. high-grade iron ore resources are required as raw materials, and low-grade oxide ores cannot be fully utilized.
Disclosure of Invention
In order to solve the technical problems, the invention provides a metallurgical reduction coupling type coking carbonization co-powder coal pyrolysis process, which realizes the coupling of a coal pyrolysis technology and a direct reduction metallurgical technology and prepares a reduced iron product with lower carbon content.
In order to solve the technical problems, the invention adopts the following technical scheme:
a metallurgical reduction coupling type coking carbonization co-terminal coal pyrolysis process comprises the following steps:
a. processing the coal raw material in a washing workshop and a molded coal and formed coke forming workshop to produce molded coal, formed coke, pulverized coal and small-sized coal;
b. the molded coal is packaged and output after being dried by a molded coal drying device;
c. the formed coke is dried by a formed coke drying device and then enters a rotary hearth heating furnace as a first path of raw material for carbonization;
d. after passing through a screening forming workshop, ore and iron concentrate enter a mineral aggregate pre-reduction device for pre-heating reduction, then enter a rotary hearth furnace as a second path of raw materials of the rotary hearth heating furnace and uniformly cover the first path of raw materials, and are carbonized to form reduced iron;
e. the carbonized formed coke and the reduced iron enter a pyrolysis device;
f. delivering the pulverized coal into a pyrolysis device to perform protective cooling on formed coke and reduced iron, and performing coal carbonization on the pulverized coal in the cooling process;
g. the small-sized coal is sent into a small-sized coal pyrolysis filtering device for preliminary heating, then sent into the pyrolysis device for homogenizing and heat sealing with the powder coal, the formed coke and the reduced iron, and further cooled and carbonized to form semicoke;
h. the high-temperature raw gas generated in the pyrolysis device is used as a heat source to be sent into a small-particle coal pyrolysis filtering device;
i. the raw gas is filtered and dedusted by a small-particle coal pyrolysis filtering device, and then purified by a condensation washing recovery device to form circulating gas, and the circulating gas is returned to the system for self use;
j. and (3) conveying the soaked semicoke, formed coke and reduced iron into a cooling device for cooling, conveying the cooled semicoke, formed coke and reduced iron into a screening magnetic separation workshop, separating the reduced iron, formed coke and semicoke powder through magnetic separation and screening, wherein the reduced iron and the formed coke are externally supplied, and conveying the semicoke powder into a washing workshop to serve as a part of raw coal.
A metallurgical reduction coupled coking co-pulverized coal pyrolysis system, comprising:
the device comprises a washing and selecting workshop, a molded coal and molded coke forming workshop, a molded coke drying device, a molded coal drying device, a small-sized coal pyrolysis filtering device, a screening and forming workshop, a mineral aggregate pre-reduction device, a rotary hearth heating furnace, a pyrolysis device, a cooling device, a screening and magnetic separation workshop and a condensing, washing and recycling device;
the washing workshop is provided with three discharge ports, the first discharge port is connected with a feed port of the molded coal formed coke forming workshop, the second discharge port is connected with a feed port of the small-particle coal pyrolysis filter device, and the third discharge port is connected with a first feed port of the pyrolysis device; the discharge port of the small-particle coal pyrolysis filtering device is connected with the second feed port of the pyrolysis device, and the high-temperature gas outlet of the pyrolysis device is connected with the heat source inlet of the small-particle coal pyrolysis filtering device;
the formed coke outlet of the formed coal formed coke forming workshop is connected with the feed inlet of the formed coke drying device, and the formed coal outlet of the formed coal formed coke forming workshop is connected with the feed inlet of the formed coal drying device; the discharge port of the molded coke drying device is connected with the first feed port of the rotary hearth heating furnace, and the discharge port of the molded coal drying device outputs molded coal products;
the discharge port of the screening forming workshop is connected with the feed port of the mineral aggregate prereduction device, the discharge port of the mineral aggregate prereduction device is connected with the second feed port of the rotary hearth heating furnace, and the discharge port of the rotary hearth heating furnace is connected with the third feed port of the pyrolysis device;
the feeding port of the cooling device is connected with the discharging port of the pyrolysis device, the air outlet of the cooling device is emptied, and the discharging port of the cooling device is connected with the feeding port of the sieving and magnetic separation workshop;
the formed coke outlet of the screening magnetic separation workshop outputs formed coke products, the reduction product outlet of the screening magnetic separation workshop is connected to the next working section, and the semicoke powder outlet of the screening magnetic separation workshop is connected with the feeding port of the washing separation workshop;
the gas inlet of the condensation washing recovery device is connected with the gas outlet of the small-particle coal pyrolysis filtering device, and the gas outlet of the condensation washing recovery device is connected with the gas inlet of the rotary bottom heating furnace.
The invention adopts a washing and classifying system to divide raw coal into pulverized coal and granular coal with different grain size ranges, and prepares molded coal and molded coke by coke powder, semi-coke powder and coking coal with binders, and ore enters a rotary hearth heating furnace for reduction after passing through a crushing screen, and the rotary hearth heating furnace is heated by circulating coal gas, so that compared with the prior art, the invention has the following technical effects:
1. the oxidized mineral or ore clusters are utilized to heat and conduct the formed coke to carbonize the formed coke, high-temperature hydrogen-rich gas generated by the formed coke is upwards penetrated through the ore material layer to reduce the ore material, and gas-solid and solid-solid reduction is carried out by utilizing the contact between the formed coke and the hot coal gas and the ore material, and the formed coke and internally matched semicoke particles, so that the reduction efficiency and speed are improved; carrying out solid heat carrier pyrolysis on the pulverized coal by utilizing sensible heat of the heat reduced iron ore and the hot type coke, and uniformly pyrolyzing the raw coal with small particle size by utilizing a mode of combining a pyrolyzed gas heat carrier and a solid heat carrier;
2. the pyrolysis device is utilized to rapidly mix high-temperature materials and the pulverized coal and carry out homogeneous pyrolysis, and meanwhile, the pyrolysis gas is utilized to carry out medium-temperature pyrolysis on the coal with small particle size, so that the coal gas latent heat is utilized, and the yield of the pyrolysis gas and tar is improved.
3. The hydrogen-rich pyrolysis gas generated by further pyrolysis of the hot coke and the semicoke in a high-temperature environment in the smelting furnace is used for supplementing the reducing gas, so that enough reducing agent is always kept, and a thick reducing atmosphere is kept, so that the reduction reaction always proceeds towards the right side of balance;
4. the cold waste gas exchanges heat with high Wen Xingjiao and reduced iron, the molded coal is dried, the flue gas at the outlet of the bottom-turning heating furnace exchanges heat with the molded coke, and the hot gas of the bottom-turning heating furnace exchanges heat with mineral aggregate; the energy utilization efficiency is high;
5. the prior art is limited by the coke ratio, high-grade ore is needed to be used as a raw material, but the invention is not limited by the grade of the raw material, and can be widely used for developing high-grade ore, low-grade ore and tailing resources.
Drawings
FIG. 1 is a flow chart of a metallurgical reduction coupling type coking co-terminal coal pyrolysis process;
FIG. 2 is a schematic structural diagram of a metallurgical reduction coupling type coking and carbonization co-terminal coal pyrolysis system.
In the figure: 100. washing and separating workshops, 110, small-sized coal, 120, powder coal, 130, coking coal, 140, raw coal, 150, coking powder, 101 and molded coal (coke);
200. a molded coal molded coke molding workshop 210, a binder 220, a molded coke drying device 230, a molded coal drying device 201, molded coke 202, molded coal 221, molded coke 222, waste gas 231, molded coal 232 and waste gas;
300. a molded coal packaging workshop 310, molded coal products 320 and undersize products;
400. a rotary hearth heating furnace 401, formed coke and reduced iron 402, high-temperature gas in the rotary hearth furnace 403 and waste gas in the rotary hearth furnace;
500. the pyrolysis device 510, the last coal bunker 520, the small-particle coal pyrolysis filter device 501, the hot coke and the reduced iron 502, the high-temperature gas 503, the hot residual gas 521 and the raw gas;
600. mineral aggregate prereduction device 610, mineral or iron concentrate 620, screening forming workshop 601, prereducing mineral aggregate;
700 cooling device, 701, briquette and reduced iron, 702 and waste gas;
800. screening and magnetic separation workshops, 810, semicoke powder, 820, pre-reduced ore clusters, 830 and formed coke;
900. the condensing, washing and recycling device 910, the circulating gas fan 901, the circulating gas, 911, the raw gas, 912 and the raw gas;
1000. the purifying device 1010 and the residual gas fan;
1100. dust collector 1110, circulating fan 1101, waste gas 1111, waste gas 1112, unnecessary waste gas.
Detailed Description
A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the metallurgical reduction coupling type coking carbonization co-terminal coal pyrolysis system of the present invention comprises: a washing and selecting workshop 100, a molded coal and molded coke forming workshop 200, a molded coke drying device 220, a molded coal drying device 230, a molded coal packaging workshop 300, a rotary hearth heating furnace 400, a pyrolysis device 500, a mineral aggregate pre-reduction device 600, a cooling device 700, a screening and magnetic separation workshop 800, a condensing, washing and recycling device 900, a purifying device 1000 and a dust removing device 1100.
Two feed inlets of the pyrolysis device 500 are connected with the tail coal bin 510 and the small-particle coal pyrolysis filtering device 520, and a feed inlet of the mineral aggregate prereduction device 600 is connected with the screening forming workshop 620.
The washing workshop 100 is provided with three discharge ports, a first discharge port is connected with a feed port of the molded coal molded coke molding workshop 200, a second discharge port is connected with a feed port of the small-particle coal pyrolysis filter device 510, and a third discharge port is connected with a first feed port of the pyrolysis device 500 through the tail coal bin 510; the discharge port of the small-particle coal pyrolysis filter device 520 is connected with the second feed port of the pyrolysis device, and the high-temperature gas outlet of the pyrolysis device is connected with the heat source inlet of the small-particle coal pyrolysis filter device.
The formed coke outlet of the formed coal formed coke forming workshop 200 is connected with the feed inlet of the formed coke drying device 220, and the formed coal outlet of the formed coal formed coke forming workshop is connected with the feed inlet of the formed coal drying device 230; the discharge port of the molded coke drying device is connected with the first feed port of the rotary hearth heating furnace 400, and the discharge port of the molded coal drying device outputs molded coal products;
the discharge port of the screening forming workshop 620 is connected with the feed port of the mineral aggregate prereduction device 600, the discharge port of the mineral aggregate prereduction device is connected with the second feed port of the rotary hearth heating furnace 400, and the discharge port of the rotary hearth heating furnace is connected with the third feed port of the pyrolysis device;
the material inlet of the cooling device 700 is connected with the material outlet of the pyrolysis device 500, the air outlet of the cooling device is emptied, and the material outlet of the cooling device is connected with the material inlet of the sieving and magnetic separation workshop 800;
the formed coke outlet of the screening magnetic separation workshop 800 outputs formed coke products, the reduction product outlet of the screening magnetic separation workshop is connected to the next working section, and the semicoke powder outlet of the screening magnetic separation workshop is connected with the feed inlet of the washing workshop 100;
the gas inlet of the condensation washing recovery device 900 is connected with the gas outlet of the small-particle coal pyrolysis filtering device 520, and the gas outlet of the condensation washing recovery device is connected with the gas inlet of the rotary hearth heating furnace 400.
The gas inlet of the purifying device 1000 is connected with the gas outlet of the mineral aggregate prereduction device 600, the gas inlet of the mineral aggregate prereduction device is connected with the gas outlet of the rotary hearth heating furnace 400, the gas outlet of the purifying device is connected with the first gas inlet of the rotary hearth heating furnace, the gas outlet of the condensing washing recovery device 900 is divided into two paths, one path is connected with the first gas inlet of the rotary hearth heating furnace, and the other path is connected with the second gas inlet of the rotary hearth heating furnace.
The exhaust gas outlet of the rotary hearth heating furnace 400 is connected with the heat source inlet of the formed coke drying apparatus 220.
The cold source inlet of the cooling device 700 is connected with the exhaust gas outlet of the briquette drying apparatus 230.
The process of the present invention is described below with reference to fig. 1:
a metallurgical reduction coupling type coking carbonization co-terminal coal pyrolysis process comprises the following steps:
the coal raw materials comprise raw coal 140, coke powder 150, coking coal 130 and semicoke powder 810 sent out by a screening and magnetic separation workshop, wherein the raw coal is divided into powder coal 120 and small-grain coal 110 by a washing workshop 100, and the coking coal, the coking coal and the semicoke powder are assisted by a binder 210 to prepare molded coal 202 and molded coke 201 in a molded coal molded coke molding workshop 200.
The molded coal 202 is dried by a molded coal drying device 230 and enters a molded coal packaging workshop 300, the molded coal packaging workshop is screened, the oversize products are packaged and output into a molded coal product 310, and the undersize products 320 are returned to the molded coal molded coke molding workshop for reprocessing.
The formed coke 201 enters a mesh belt type formed coke drying device 220 for drying, and the dried formed coke 221 enters a rotary hearth heating furnace 400 for secondary carbonization, which is the first path of raw material of the rotary hearth heating furnace.
Ore and fine iron powder 610 passes through a screening forming workshop 620 and then enters a mineral aggregate pre-reduction device 600 for pre-heating reduction. Then the second path of raw materials serving as the rotary hearth heating furnace 400 enter the rotary hearth heating furnace and are uniformly covered on the first path of raw materials.
The rotary hearth heating furnace 400 is divided into a direct flame heating zone having a temperature of 550 degrees and a radiant tube heating zone having a temperature of 1100 degrees. The formed coke in the rotary hearth heating furnace is carbonized at high temperature to release a large amount of pyrolysis gas, penetrates through the ore and iron fine powder layer to be reduced at high temperature, and is introduced into part of circulating gas 901 to ensure enough reducing gas through radiation heating. The high-temperature gas 402 in the rotary hearth furnace enters a mineral aggregate pre-reduction device to pre-heat and reduce ore and iron fine, and raw gas 602 enters the rotary hearth heating furnace 400 after passing through a purification device 1000 and a residual gas fan 1010. The waste gas 403 in the rotary hearth furnace of the rotary hearth furnace 400 enters the formed coke drying apparatus 220 as a heat source.
The carbonized formed coke and reduced iron 401 enter the pyrolysis device 500 through a hot discharge device of a rotary hearth furnace. In the pyrolysis device, the pulverized coal 120 from the washing workshop is uniformly mixed with the hot materials fed by the rotary hearth heating furnace through the quantitative feeding device of the pulverized coal bin 510, the formed coke and the reduced iron are subjected to protective cooling, and the pulverized coal is subjected to carbonization in the cooling process. A large amount of high-temperature coal gas 502 generated in the carbonization process enters a small-particle coal pyrolysis filter device 520 to be used as a heat source; the small-sized coal 110 from the washing and sorting workshop enters a small-sized coal pyrolysis filtering device, the high-temperature coal gas is cooled and filtered through the pyrolysis filtering device, the small-sized coal which is heated preliminarily is fed into the pyrolysis device through a quantitative feeding device, and the powder coal and the small-sized coal are subjected to homogenization, thermal smouldering, further cooling and coal carbonization in a pyrolysis furnace and hot coke heating and reduced iron heating. The high-temperature coal gas 502 is filtered and dedusted by a small-particle coal pyrolysis filtering device, enters a condensation washing recovery device 900, is purified by tar recovery, coal gas desulfurization and the like to form circulating coal gas 901, and is sent back to the system for self-use by a circulating blower 910. The circulating gas is divided into two paths, one path of raw gas 912 directly enters the rotary bottom heating furnace, and the other path of raw gas 911, raw gas from the purification device and air enter the rotary bottom heating furnace. Meanwhile, the hot residual gas circulated from the subsequent pyrolysis device enters the rotary hearth heating furnace through the hot gas 503 leading-in pipe to supplement gas, and takes part in combustion and reduction.
The soaked semicoke, the formed coke and the reduced iron are sent into a cooling device 700 together, cooled to 120 ℃ by 80-DEG waste gas 702 rich in water vapor from a formed coal drying device 230 and discharged, and separated into pre-reduced ore clusters 820, formed coke 830 and semicoke powder 810 through a sieving and magnetic separation workshop 800, wherein the semicoke powder returns to the system for self use.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (9)
1. A metallurgical reduction coupling type coking carbonization co-terminal coal pyrolysis process is characterized by comprising the following steps of:
a. processing the coal raw material in a washing workshop and a molded coal and formed coke forming workshop to produce molded coal, formed coke, pulverized coal and small-sized coal;
b. the molded coal is packaged and output after being dried by a molded coal drying device;
c. the formed coke is dried by a formed coke drying device and then enters a rotary hearth heating furnace as a first path of raw material for carbonization;
d. after passing through a screening forming workshop, ore and iron concentrate enter a mineral aggregate pre-reduction device for pre-heating reduction, then enter a rotary hearth furnace as a second path of raw materials of the rotary hearth heating furnace and uniformly cover the first path of raw materials, and are carbonized to form reduced iron;
e. the carbonized formed coke and the reduced iron enter a pyrolysis device;
f. delivering the pulverized coal into a pyrolysis device to perform protective cooling on formed coke and reduced iron, and performing coal carbonization on the pulverized coal in the cooling process;
g. the small-sized coal is sent into a small-sized coal pyrolysis filtering device for preliminary heating, then sent into the pyrolysis device for homogenizing and heat sealing with the powder coal, the formed coke and the reduced iron, and further cooled and carbonized to form semicoke;
h. the high-temperature raw gas generated in the pyrolysis device is used as a heat source to be sent into a small-particle coal pyrolysis filtering device;
i. the raw gas is filtered and dedusted by a small-particle coal pyrolysis filtering device, and then purified by a condensation washing recovery device to form circulating gas, and the circulating gas is returned to the system for self use;
j. and (3) conveying the soaked semicoke, formed coke and reduced iron into a cooling device for cooling, conveying the cooled semicoke, formed coke and reduced iron into a screening magnetic separation workshop, separating the reduced iron, formed coke and semicoke powder through magnetic separation and screening, wherein the reduced iron and the formed coke are externally supplied, and conveying the semicoke powder into a washing workshop to serve as a part of raw coal.
2. The metallurgical reduction coupling type coking and carbonization co-dust coal pyrolysis process according to claim 1, wherein the coal raw materials comprise raw coal, coking powder and coking coal, and semi-coking powder sent out from a sieving and magnetic separation workshop, wherein the raw coal is separated into dust coal and small-particle coal through washing, and the coking powder, the coking coal and the semi-coking powder are prepared into molded coal and molded coke by being assisted by a binder.
3. The metallurgical reduction coupling type coking and carbonization co-pulverized coal pyrolysis process according to claim 2, wherein the coke powder and the semicoke powder are mixed in a molded coal and molded coke forming workshop through an adhesive to form molded coal and molded coke.
4. The metallurgical reduction coupling type coking and carbonization co-terminal coal pyrolysis process according to claim 1, wherein in the step c, the waste gas generated by the rotary hearth heating furnace is sent into a formed coke drying device to be used as a heat source.
5. The metallurgical reduction coupling type coking co-terminal coal pyrolysis process according to claim 1, wherein in the step d, high-temperature gas generated by the rotary hearth heating furnace is sent into a mineral aggregate prereduction device to be used as a heat source, cooled by the mineral aggregate prereduction device, sent into a purification device to be purified, and then mixed with circulating gas and air sent out by a condensation washing recovery device to enter the rotary hearth heating furnace.
6. The metallurgical reduction coupling type coking and carbonization co-terminal coal pyrolysis process according to claim 5, wherein the circulating gas can be independently fed into a rotary hearth heating furnace, and the reducing gas is ensured by radiation heating.
7. The metallurgical reduction coupling type coking and carbonization co-pulverized coal pyrolysis process according to claim 1, wherein in the step j, the cold source of the cooling device is from the exhaust gas of the molded coal drying device.
8. A metallurgical reduction coupling type coking and carbonization co-terminal coal pyrolysis system, which is characterized by comprising:
the device comprises a washing and selecting workshop, a molded coal and molded coke forming workshop, a molded coke drying device, a molded coal drying device, a small-sized coal pyrolysis filtering device, a screening and forming workshop, a mineral aggregate pre-reduction device, a rotary hearth heating furnace, a pyrolysis device, a cooling device, a screening and magnetic separation workshop and a condensing, washing and recycling device;
the washing workshop is provided with three discharge ports, the first discharge port is connected with a feed port of the molded coal formed coke forming workshop, the second discharge port is connected with a feed port of the small-particle coal pyrolysis filter device, and the third discharge port is connected with a first feed port of the pyrolysis device; the discharge port of the small-particle coal pyrolysis filtering device is connected with the second feed port of the pyrolysis device, and the high-temperature gas outlet of the pyrolysis device is connected with the heat source inlet of the small-particle coal pyrolysis filtering device;
the formed coke outlet of the formed coal formed coke forming workshop is connected with the feed inlet of the formed coke drying device, and the formed coal outlet of the formed coal formed coke forming workshop is connected with the feed inlet of the formed coal drying device; the discharge port of the molded coke drying device is connected with the first feed port of the rotary hearth heating furnace, and the discharge port of the molded coal drying device outputs molded coal products;
the discharge port of the screening forming workshop is connected with the feed port of the mineral aggregate prereduction device, the discharge port of the mineral aggregate prereduction device is connected with the second feed port of the rotary hearth heating furnace, and the discharge port of the rotary hearth heating furnace is connected with the third feed port of the pyrolysis device;
the feeding port of the cooling device is connected with the discharging port of the pyrolysis device, the air outlet of the cooling device is emptied, and the discharging port of the cooling device is connected with the feeding port of the sieving and magnetic separation workshop;
the formed coke outlet of the screening magnetic separation workshop outputs formed coke products, the reduction product outlet of the screening magnetic separation workshop is connected to the next working section, and the semicoke powder outlet of the screening magnetic separation workshop is connected with the feeding port of the washing separation workshop;
the gas inlet of the condensation washing recovery device is connected with the gas outlet of the small-particle coal pyrolysis filtering device, and the gas outlet of the condensation washing recovery device is connected with the gas inlet of the rotary bottom heating furnace; the gas inlet of the purification device is connected with the gas outlet of the mineral aggregate prereduction device, the gas inlet of the mineral aggregate prereduction device is connected with the gas outlet of the rotary bottom heating furnace, the gas outlet of the purification device is connected with the first gas inlet of the rotary bottom heating furnace, the gas outlet of the condensation washing recovery device is divided into two paths, one path is connected with the first gas inlet of the rotary bottom heating furnace, and the other path is connected with the second gas inlet of the rotary bottom heating furnace; and an exhaust gas outlet of the rotary hearth heating furnace is connected with a heat source inlet of the formed coke drying device.
9. A metallurgical reduction coupling type coking and carbonization co-terminal coal pyrolysis system, which is characterized by comprising:
the device comprises a washing and selecting workshop, a molded coal and molded coke forming workshop, a molded coke drying device, a molded coal drying device, a small-sized coal pyrolysis filtering device, a screening and forming workshop, a mineral aggregate pre-reduction device, a rotary hearth heating furnace, a pyrolysis device, a cooling device, a screening and magnetic separation workshop and a condensing, washing and recycling device;
the washing workshop is provided with three discharge ports, the first discharge port is connected with a feed port of the molded coal formed coke forming workshop, the second discharge port is connected with a feed port of the small-particle coal pyrolysis filter device, and the third discharge port is connected with a first feed port of the pyrolysis device; the discharge port of the small-particle coal pyrolysis filtering device is connected with the second feed port of the pyrolysis device, and the high-temperature gas outlet of the pyrolysis device is connected with the heat source inlet of the small-particle coal pyrolysis filtering device;
the formed coke outlet of the formed coal formed coke forming workshop is connected with the feed inlet of the formed coke drying device, and the formed coal outlet of the formed coal formed coke forming workshop is connected with the feed inlet of the formed coal drying device; the discharge port of the molded coke drying device is connected with the first feed port of the rotary hearth heating furnace, and the discharge port of the molded coal drying device outputs molded coal products;
the discharge port of the screening forming workshop is connected with the feed port of the mineral aggregate prereduction device, the discharge port of the mineral aggregate prereduction device is connected with the second feed port of the rotary hearth heating furnace, and the discharge port of the rotary hearth heating furnace is connected with the third feed port of the pyrolysis device;
the feeding port of the cooling device is connected with the discharging port of the pyrolysis device, the air outlet of the cooling device is emptied, and the discharging port of the cooling device is connected with the feeding port of the sieving and magnetic separation workshop;
the formed coke outlet of the screening magnetic separation workshop outputs formed coke products, the reduction product outlet of the screening magnetic separation workshop is connected to the next working section, and the semicoke powder outlet of the screening magnetic separation workshop is connected with the feeding port of the washing separation workshop;
the gas inlet of the condensation washing recovery device is connected with the gas outlet of the small-particle coal pyrolysis filtering device, and the gas outlet of the condensation washing recovery device is connected with the gas inlet of the rotary bottom heating furnace; the gas inlet of the purification device is connected with the gas outlet of the mineral aggregate prereduction device, the gas inlet of the mineral aggregate prereduction device is connected with the gas outlet of the rotary bottom heating furnace, the gas outlet of the purification device is connected with the first gas inlet of the rotary bottom heating furnace, the gas outlet of the condensation washing recovery device is divided into two paths, one path is connected with the first gas inlet of the rotary bottom heating furnace, and the other path is connected with the second gas inlet of the rotary bottom heating furnace;
and a cold source inlet of the cooling device is connected with an exhaust gas outlet of the molded coal drying device.
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| CN108795458A (en) * | 2018-07-20 | 2018-11-13 | 新疆乾海环保科技有限公司 | Formed coke couples smalls pyrolytic process and system |
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| CN113214854B (en) * | 2021-06-11 | 2024-09-03 | 新疆乾海环保科技有限公司 | Hydrogen-rich gas metallurgy reduction co-low-valence pulverized coal pyrolysis process and system |
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