CN113247945B - Device and method for synthesizing zinc oxide by zinc vapor in metallurgical zinc-containing ash treatment process - Google Patents
Device and method for synthesizing zinc oxide by zinc vapor in metallurgical zinc-containing ash treatment process Download PDFInfo
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- CN113247945B CN113247945B CN202110552909.8A CN202110552909A CN113247945B CN 113247945 B CN113247945 B CN 113247945B CN 202110552909 A CN202110552909 A CN 202110552909A CN 113247945 B CN113247945 B CN 113247945B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G9/00—Compounds of zinc
- C01G9/02—Oxides; Hydroxides
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The invention discloses a device and a method for synthesizing zinc oxide by zinc vapor in the process of treating metallurgical zinc-containing ash. In the process of treating zinc-containing ash by coal gasification suspension smelting, superheated steam is sprayed from a steam jet injection port in a mixed gas flow of high-temperature zinc steam and coal gas in an ascending flue at 1200-1500 ℃, the steam is ionized at high temperature to generate oxygen and hydrogen, the oxygen and the zinc steam react to generate zinc oxide, then the high-temperature gas flow enters a two-stage cyclone separator for zinc oxide recovery, then waste heat recovery is carried out, dust is recovered again through a bag-type dust collector after the waste heat recovery, and tail gas is processed and utilized after passing through an induced draft fan. The invention provides a method for synthesizing zinc oxide by spraying water vapor into zinc vapor with high coal gas content, which can improve the coal gas quality by producing hydrogen gas to release heat while synthesizing zinc oxide by zinc vapor.
Description
Technical Field
The invention relates to a device and a method for synthesizing zinc oxide by zinc vapor in the process of treating metallurgical zinc-containing ash, belonging to the technical field of nonferrous metallurgy environmental protection.
Background
Chinese patent CN112391535A discloses a device and a method for treating and utilizing metallurgical zinc-containing ash in a suspension state for smelting reduction and recovery of zinc oxide, and the disclosed patent provides a new technology for treating and utilizing metallurgical zinc-containing ash, which has the advantages of investment saving, short flow, thorough dezincification and full and efficient recovery of iron in slag. In the new technology, to efficiently recover about 30% of iron content in slag, the content of carbon monoxide and hydrogen in the reducing atmosphere in the smelting process must be increased, so that the content of carbon monoxide and hydrogen in high-temperature tail gas is inevitably increased, and if the zinc oxide is recovered by adopting the traditional air and oxygen oxidation method, the explosion risk exists. The content of carbon monoxide and hydrogen in the tail gas is reduced, and about 30 percent of iron content in the slag is necessarily reduced and efficiently recovered in the form of molten iron. The invention adopts the steam oxidation method of spraying steam into high-temperature zinc steam and coal gas to synthesize zinc oxide, thereby not only improving the high-efficiency recovery of iron in slag, but also overcoming the danger of easy explosion of the traditional air and oxygen oxidation method under high coal gas content, solving the technical problem, simultaneously generating a certain amount of hydrogen to emit a certain amount of heat, improving the quality of coal gas, and being the need of high-efficiency treatment of zinc-containing solid waste in the metallurgical industry.
Disclosure of Invention
The invention aims to provide a device and a method for recovering zinc oxide in the process of treating and utilizing metallurgical zinc-containing ash by adopting a coal gasification suspension smelting technology, which not only realize the high-efficiency recovery of iron in slag, but also overcome the danger that the traditional air oxygen oxidation method is easy to explode under the condition of high coal gas content, simultaneously generate a certain amount of hydrogen and release a certain amount of heat, improve the quality of coal gas and are urgent needs for the high-efficiency treatment of zinc-containing solid waste in the metallurgical industry.
The invention provides a novel method for recovering zinc oxide in the process of treating and utilizing zinc-containing ash in the metallurgical industry by adopting a coal gasification suspension smelting technology, and particularly relates to a method for improving the high-efficiency recovery of iron in slag and overcoming the danger of easy explosion of the traditional air oxygen oxidation method under high coal gas content in the process of treating and utilizing the metallurgical zinc-containing ash by adopting the coal gasification suspension smelting technology, so that the technical problem is solved. The zinc in metallurgical zinc-containing ash generally exists in an oxidation state, and in the traditional treatment, zinc oxide is firstly reduced into metallic zinc by carbon and carbon monoxide, the metallic zinc is gasified into zinc vapor at high temperature, and then the zinc vapor is oxidized into zinc oxide. The metallurgical zinc-containing ash is treated by a coal gasification suspension flash smelting technology, because a large amount of coal gas is accompanied in zinc-containing steam, the traditional oxygen and air oxidation method can be used for oxidizing the zinc steam only if the coal gas content is lower than a certain value, and the traditional oxygen and air oxidation method cannot be adopted for the zinc steam with high coal gas content because of explosion danger.
The invention provides a device for synthesizing zinc oxide by zinc vapor in the process of treating metallurgical zinc-containing ash. The uptake is turned; a water vapor jet flow spraying port is arranged at the corner of the uptake flue; the two-stage cyclone separator is connected outside the uptake flue; the airflow outlet of the cyclone separator is connected with a waste heat utilization device, and the lower opening of the cyclone separator is connected with a crude zinc oxide storage tank; the back of the waste heat utilization device is connected with a bag-type dust collector and then connected with an induced draft fan, and the back of the induced draft fan is connected with a coal gas finishing and utilizing device.
The invention provides a method for synthesizing zinc oxide by zinc vapor in the process of treating metallurgical zinc-containing ash by coal gasification suspension smelting, wherein in the process of treating the zinc-containing ash by coal gasification suspension smelting, superheated steam is sprayed into mixed gas flow of high-temperature zinc vapor and coal gas at 1200-1500 ℃ in an ascending flue, the steam is ionized to generate oxygen and hydrogen, the oxygen and the zinc vapor react to generate zinc oxide, then the high-temperature gas flow enters a cyclone separator for primary dust collection and then waste heat recovery, the waste heat recovery is carried out, then secondary dust recovery is carried out, and tail gas is processed and utilized after passing through an induced draft fan.
According to the method for synthesizing zinc oxide by using zinc vapor in the process of treating metallurgical zinc-containing ash by coal gasification suspension smelting, the lower limit temperature of the oxidation reaction of water vapor and zinc vapor is 960 ℃, and the reaction time is 2-4 seconds.
The method for synthesizing zinc oxide by zinc vapor in the process of treating metallurgical zinc-containing ash by coal gasification suspension smelting has the advantage that the temperature of the sprayed water vapor is 200-800 ℃.
According to the method for synthesizing zinc oxide by using zinc vapor in the process of treating metallurgical zinc-containing ash through coal gasification suspension smelting, a water vapor injection port and a rear system are controlled to be negative pressure by adjusting a pressure head and air quantity of an induced draft fan, the zero position of the negative pressure is positioned at the water vapor injection port, and the negative pressure keeps dust to smoothly run towards the rear system.
The method for synthesizing zinc oxide by zinc vapor in the process of treating metallurgical zinc-containing ash by coal gasification suspension smelting adopts a dry process for secondary dust removal; the spraying amount of the water vapor is measured by 2-3 times of the oxygen amount required by the zinc vapor; the draught fan is interlocked with the steam spraying system.
The invention has the technical characteristics and beneficial effects that: a. the synthesis of zinc oxide of zinc vapor under the background of high coal gas is solved; b. meanwhile, a certain amount of hydrogen and heat are generated, so that the quality of the coal gas is improved; has remarkable novelty, creativity and practicability.
Drawings
FIG. 1 is a block diagram of the technological process for synthesizing zinc oxide in the process of treating zinc-containing ash.
FIG. 2 is a schematic structural diagram of a device for synthesizing zinc oxide in the process of treating zinc-containing ash.
In the figure: 1. a pulverized coal inlet; 2. a pure oxygen inlet; 3. zinc-containing ash is imported; 4. a suspension smelting furnace 5, a molten pool 6, a slag outlet 7 and a molten iron outlet; 8. a rising flue; 9. a water vapor injection port; 10. a primary cyclone separator; 11. a secondary cyclone separator; 12. a crude zinc oxide storage tank; 13. a waste heat recovery device; 14. a bag dust collector; 15. an induced draft fan; 16. a coal gas finishing and utilizing device.
Detailed Description
The present invention is further illustrated by, but is not limited to, the following examples.
The invention provides a device for synthesizing zinc oxide by zinc vapor in the process of treating metallurgical zinc-containing ash through coal gasification suspension smelting, as shown in figures 1 and 2, the left side of the device is provided with a descending coal gasification suspension smelting furnace 4, the lower part is provided with a molten pool 5, and the right side of the molten pool 5 is provided with an ascending uptake 8. The uptake 8 is turned; a water vapor injection port 9 is arranged at the corner of the uptake flue 8; the outside of the uptake flue 8 is connected with two stages of cyclone separators; the airflow outlet of the cyclone separator is connected with a waste heat utilization device 13, and the lower opening of the cyclone separator is connected with a crude zinc oxide storage tank 12; the rear part of the waste heat utilization device is connected with a cloth bag dust collector 14 and then connected with an induced draft fan 15, and the rear part of the induced draft fan 15 is connected with a coal gas finishing and utilizing device 16.
The invention provides a method for synthesizing zinc oxide by zinc vapor in the process of treating metallurgical zinc-containing ash by coal gasification suspension smelting, which comprises the following steps:
in the process of treating zinc-containing ash by coal gasification suspension smelting, high-temperature zinc vapor at 1200-1500 ℃ and coal gas form mixed airflow in an ascending flue 8, superheated water vapor is sprayed in through a water vapor spraying port 9 and ionized to generate oxygen and hydrogen, wherein the oxygen and the zinc vapor react to generate zinc oxide, then the high-temperature airflow enters a primary cyclone separator 10 and a secondary cyclone separator 11 to collect dust, crude zinc oxide enters a crude zinc oxide storage tank 12, the high-temperature coal gas enters a waste heat recovery device 13 to recover waste heat, the waste heat is recovered through a bag dust collector 14, and the tail coal gas passes through an induced draft fan 15 and then enters a coal gas finishing and utilizing device 16 to be processed and utilized.
In the process, the lower limit temperature of the oxidation reaction of the water vapor and the zinc vapor is 960 ℃, and the reaction time is 2-4 seconds; spraying water vapor at 200-800 deg.c; the water vapor injection port and the rear system are controlled to be negative pressure by adjusting a pressure head and air quantity of the induced draft fan, the zero point position of the negative pressure is positioned at the water vapor injection port, and the negative pressure keeps dust to smoothly run to the rear system; the induced draft fan is interlocked with the steam spraying system; a dry process for secondary dust removal; the amount of water vapor sprayed is 2-3 times of the amount of oxygen required by the zinc vapor.
The method for synthesizing zinc oxide from zinc vapor in the metallurgical zinc-containing ash treatment and utilization process is detailed by specific implementation processes.
The first embodiment is as follows:
setting a water vapor injection port 9 in an uptake flue 8 of the coal gasification suspension smelting furnace to inject superheated water vapor, wherein the temperature of the water vapor is 200 ℃, the reaction time of the zinc vapor and the water vapor is 2 seconds, and the injection amount of the water vapor is 3 times of the oxygen demand of the zinc vapor; the water vapor injection inlet and the rear system are controlled to be negative pressure by adjusting the pressure head and the air quantity of the induced draft fan, the zero position of the negative pressure is positioned at the water vapor injection inlet, and the negative pressure keeps the dust to smoothly run to the rear system; the draught fan 15 is interlocked with the water vapor injection port 9; high-temperature air flow enters a primary cyclone separator 10 and a secondary cyclone separator 11 at the temperature of below 960 ℃ for dust collection, crude zinc oxide enters a crude zinc oxide storage tank 12, high-temperature coal gas is subjected to a waste heat recovery device 13, the waste heat is recovered and then dust is recovered by a bag dust collector 14, and the coal gas passes through an induced draft fan 15 and then enters a coal gas finishing and utilizing device 16 for processing and utilization.
Example two:
setting a water vapor injection port 9 in an ascending flue 8 of the coal gasification suspension smelting furnace to inject superheated water vapor, wherein the temperature of the water vapor is 400 ℃, the reaction time of the zinc vapor and the water vapor is 4 seconds, and the injection amount of the water vapor is 2 times of the oxygen demand of the zinc vapor; the water vapor injection inlet and the rear system are controlled to be negative pressure by adjusting the pressure head and the air quantity of the induced draft fan, the zero position of the negative pressure is positioned at the water vapor injection inlet, and the negative pressure keeps the dust to smoothly run to the rear system; the induced draft fan 15 is interlocked with the steam injection system 9; high-temperature airflow enters a cyclone separator for dust collection at the temperature below 960 ℃, crude zinc oxide enters a device 12, high-temperature coal gas is subjected to a waste heat recovery device 13, dust is recovered through a bag dust collector 14 after waste heat recovery, and the coal gas is processed and utilized by a coal gas finishing and utilizing device 16 after passing through a draught fan 15.
Example three:
setting a water vapor injection port 9 in an ascending flue 8 of the coal gasification suspension smelting furnace to inject superheated water vapor, wherein the temperature of the water vapor is 300 ℃, the reaction time of the zinc vapor and the water vapor is 3 seconds, and the injection amount of the water vapor is 2.5 times of the oxygen demand of the zinc vapor; the pressure head of the induced draft fan and the air quantity are adjusted to control the water vapor injection inlet and the rear system to be negative pressure, the zero position of the negative pressure is positioned at the water vapor injection inlet, and the negative pressure degree is used for keeping dust to smoothly run towards the rear system; the induced draft fan 15 is interlocked with the steam injection system 9; high-temperature airflow enters a cyclone separator for dust collection at the temperature below 960 ℃, crude zinc oxide enters a device 12, high-temperature coal gas enters a waste heat recovery device 13, dust is recovered through a bag dust collector 14 after waste heat recovery, and the coal gas passes through a draught fan 15 and then enters a coal gas finishing and utilizing device 16 for processing and utilization.
Claims (6)
1. The utility model provides a device that administers metallurgical zinc-containing ash in-process zinc steam synthetic zinc oxide which characterized in that: the left side of the device is provided with a descending coal gasification suspension smelting furnace, the lower part is provided with a molten pool, and the right side of the molten pool is provided with an ascending uptake; the uptake is turned; a water vapor jet flow spraying port is arranged at the corner of the uptake flue; the two-stage cyclone separator is connected outside the uptake flue; the airflow outlet of the cyclone separator is connected with a waste heat utilization device, and the lower opening of the cyclone separator is connected with a coarse zinc oxide storage tank; the rear part of the waste heat utilization device is connected with a bag-type dust collector and then connected with an induced draft fan, and the rear part of the induced draft fan is connected with a coal gas utilization device;
the metallurgical zinc-containing ash is treated by using a coal gasification suspension flash smelting technology, so that zinc oxide is synthesized by zinc vapor under high coal gas content.
2. A method for treating zinc vapor to synthesize zinc oxide in the process of metallurgical zinc-containing ash, which adopts the device of claim 1 and is characterized in that: in the process of treating zinc-containing ash by coal gasification suspension smelting, superheated steam is sprayed from a steam jet injection port in a mixed gas flow of high-temperature zinc steam and coal gas in an ascending flue at 1200-1500 ℃, the steam is ionized at high temperature to generate oxygen and hydrogen, the oxygen and the zinc steam react to generate zinc oxide, then the high-temperature gas flow enters a two-stage cyclone separator for zinc oxide recovery, then waste heat recovery is carried out, dust is recovered again through a bag-type dust collector after the waste heat recovery, and tail gas is processed and utilized after passing through an induced draft fan.
3. The method for treating zinc oxide synthesized from zinc vapor in the process of metallurgical zinc-containing ash according to claim 2, which is characterized in that: the lower limit temperature of the oxidation reaction of the water vapor and the zinc vapor is 960 ℃, and the reaction time is 2-4 seconds.
4. The method for treating zinc oxide synthesized from zinc vapor in the process of metallurgical zinc-containing ash according to claim 2, which is characterized in that: the temperature of the sprayed superheated steam is 200-800 ℃.
5. The method for synthesizing zinc oxide by using zinc vapor in the process of treating metallurgical zinc-containing ash according to claim 2, wherein the method comprises the following steps: the water vapor injection port and the rear system are controlled to be negative pressure by adjusting the pressure head and the air quantity of the draught fan, the zero position of the negative pressure is positioned at the water vapor injection port, and the negative pressure keeps dust to smoothly run towards the rear system.
6. The method for treating zinc vapor in metallurgical zinc-containing ash to synthesize zinc oxide according to claim 2, which is characterized in that: the spraying amount of the water vapor is measured by 2-3 times of the oxygen demand of the zinc vapor; the draught fan is interlocked with the steam spraying system.
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