CN212335216U - Fly ash processing system is smelted to blast furnace - Google Patents
Fly ash processing system is smelted to blast furnace Download PDFInfo
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- CN212335216U CN212335216U CN202021341288.6U CN202021341288U CN212335216U CN 212335216 U CN212335216 U CN 212335216U CN 202021341288 U CN202021341288 U CN 202021341288U CN 212335216 U CN212335216 U CN 212335216U
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Abstract
A blast furnace smelting fly ash treatment system belongs to the field of environmental protection, and comprises a closed tank car, a fly ash storage tank, a coal grinding device, a pulverized coal storage tank, a premixing and whirling device, a mixture storage tank, a blowing tank, a distributor, a spray gun and a blast furnace; the utility model discloses set up annular coal injection mouth in the furnace hearth department of blast furnace, together spout into the blast furnace with buggy, flying dust and combustion-supporting gas through annular coal injection mouth, utilize the high temperature environment in the blast furnace to do innocent treatment and utilization to the flying dust. The utility model discloses processing system makes the whole high added value of various metals in the flying dust retrieve, does not take up an area of, and the small investment, no environmental pollution, realizability is good.
Description
Technical Field
The utility model belongs to the environmental protection field, in particular to a flying dust processing system is smelted to blast furnace.
Background
At present, fly ash treatment of waste incineration comprises various solidification methods and then landfill, cement process solidification is also used, the fly ash treatment is also used for producing fillers individually, foreign plasma melting methods are also used, the fly ash treatment is limited by various conditions, such as material properties, environment, process and other environmental protection, the operation cost is too high, and the fly ash treatment is not popularized widely.
The waste incineration fly ash contains multiple eutectic of heavy metal, alkali metal and light metal, and contains chlorine, fluorine and dioxin, and the purpose of treatment is firstly harmless, and preferably resource utilization.
SUMMERY OF THE UTILITY MODEL
In order to develop an economical and practical, the harmless flying dust processing technology of environmental protection, the utility model provides a flying dust processing system is smelted to blast furnace sets up annular coal injection mouth in the furnace hearth department of blast furnace, passes through annular coal injection mouth with buggy and flying dust and together spout into the blast furnace, utilizes the high temperature environment in the blast furnace to do innocent treatment and utilization to the flying dust. The specific technical scheme is as follows:
a blast furnace smelting fly ash processing system is shown in figure 1 and comprises a closed tank car 1, a fly ash storage tank 2, a coal grinding device 3, a coal powder storage tank 4, a premixing and whirling device 5, a mixture storage tank 6, a blowing tank 7, a distributor 8, a spray gun 9 and a blast furnace 10;
the top end of the mixture storage tank 6 is provided with an explosion-proof hole 11; a coal injection port 12 is arranged at the hearth of the blast furnace 10, and a zinc recovery device 13 is arranged in a gas-liquid circulation area of a furnace body of the blast furnace 10; a lead outlet 14 is arranged at the bottom of the blast furnace 10;
the coal injection ports 12 are arranged around the wall of the blast furnace, and the number of the coal injection ports 12 is determined according to the scale of the blast furnace; the number of the spray guns 9 is equal to that of the coal injection ports 12;
the discharge port of the closed tank car 1 is connected with the feed port of the fly ash storage tank 2 through a pipeline, the discharge port of the coal grinding device 3 is connected with the feed port of the coal powder storage tank 4 through a pipeline, the discharge ports of the fly ash storage tank 2 and the coal powder storage tank 4 are respectively connected with the feed port of the premixing cyclotron equipment 5 through pipelines, the discharge port of the premixing cyclotron equipment 5 is sequentially connected with the mixture storage tank 6, the injection tank 7, the distributor 8 and the spray gun 9 through pipelines, and the nozzle of the spray gun 9 is connected to the coal injection port 12 at the hearth of the;
the treatment method of the blast furnace smelting fly ash treatment system comprises the following steps:
step 1, mixing:
conveying the fly ash in the closed tank car 1 to a fly ash storage tank 2 by adopting air flow conveying, wherein conveying gas adopts nitrogen or dry air; anthracite is ground into coal powder with the granularity less than 2mm in a coal grinding device 3 and is conveyed into a coal powder storage tank 4 through airflow; and then conveying the fly ash and the coal powder to a premixing rotary device 5 through a pipeline for uniform mixing, wherein the mixing mass ratio of the fly ash to the coal powder is (10-50): (90-50), preparing mixed powder, conveying the mixed powder to a mixed material storage tank 6 through air flow, and storing;
conveying mixed powder in a mixed material storage tank 6 into an injection tank 7 through a pipeline by adopting air flow conveying, conveying the conveying gas by adopting nitrogen or dry air, conveying the mixed powder into a distributor 8 to distribute the mixed powder to a spray gun 9 through a branch, and finally spraying the mixed powder and combustion-supporting gas into a hearth of a blast furnace 10 through a coal injection port 12 by using the spray gun 9, wherein the combustion-supporting gas is air or oxygen-enriched air;
the position of a coal injection port 12 in a hearth of the blast furnace 10 is an injection area, the injection area is an oxidation environment, the temperature is 1600-1800 ℃, and dioxin in fly ash is oxidized at high temperature to become fuel to be burnt; a large amount of fluorine and chlorine enter the furnace slag, a small amount of fluorine and chlorine escape from the blast furnace 10 along with the gas in the form of hydrogen fluoride and hydrogen chloride acid gas, and the escaped gas is doped with hydrogen fluoride and hydrogen chloride acid gas, so that the corrosion to equipment in the subsequent use process of the gas is reduced, and the deacidification treatment is carried out by using an alkaline material before the gas is recovered;
the mixed powder flows away from the blowing area in the blast furnace 10 and enters other areas in the blast furnace 10, the other areas are all in reducing atmosphere, the metallic element lead in the fly ash is reduced into metal which falls into molten iron, the metal is not fused with the molten iron, the metal is deposited at the bottom of the blast furnace 10, and finally the metal is recovered through a lead outlet 14; the metal elements of zinc and cadmium in the fly ash are reduced into metal and gasified, the metal and other easily gasified metal are circularly enriched in a gas state in the blast furnace 10, and finally the metal is led out by a zinc recovery device 13 of the blast furnace 10 to be recovered and solidified; the metallic elements of copper, iron and manganese in the fly ash are reduced into metal which is directly dissolved in molten iron; aluminum, potassium, sodium and other active metal elements in the fly ash enter the slag in the form of compounds; after the silicon element in the fly ash is reduced, a small amount of silicon enters molten iron, and a large amount of silicon enters furnace slag;
after smelting in the blast furnace 10, all fly ash sprayed into the blast furnace 10 is treated harmlessly, and resource recycling is achieved;
in the step 2, the blowing speed of the spray gun 9 is 0.5-1.5 tons/hour;
in step 3, the deacidification treatment is carried out by adopting a semi-dry method for solid adsorption removal or spraying an alkaline solution for removal; the alkaline material used for the semi-dry method solid adsorption and removal is a magnesium hydroxide block or a calcium hydroxide block; the alkaline material used for removing the sprayed alkaline solution is sodium hydroxide solution.
The utility model discloses a flying dust processing system is smelted to blast furnace, compared with prior art, beneficial effect is:
firstly, the utility model discloses compare with the landfill technology, need not to occupy the soil, thoroughly eliminated the landfill and polluted the hidden danger, be whole resource utilization moreover, owing to utilize original metallurgical equipment, only need do a small amount of transformation, the investment is very little, and comprehensive running cost also is less than the landfill technology.
Compared with the cement processing method, the utility model almost completely recovers various metals in the fly ash with high added value, utilizes the metals as resources and has no hidden danger. The chloride ions in the cement method treatment can influence the cement quality, heavy metals still have the risk of being dissolved out, no value is brought to cement production, and the method is only an innocent method for reducing harm.
Thirdly, the utility model discloses compare with plasma vitrification method, the investment is 10 ~ 20% of plasma vitrification method, and the treatment cost is 10% of plasma vitrification method, and the added value also is far more than plasma vitrification method after the processing, does not have exhaust emission moreover, and the operation process does not have the secondary and reveals the risk.
Drawings
FIG. 1 is a schematic structural diagram of a fly ash treatment system for blast furnace smelting in embodiment 1 of the present invention: the system comprises a closed tank truck 1, a fly ash storage tank 2, a coal grinding device 3, a coal powder storage tank 4, a premixing and whirling device 5, a mixture storage tank 6, a blowing tank 7, a distributor 8, a spray gun 9, a blast furnace 10, an explosion-proof hole 11, a coal injection port 12, a zinc recovery device 13 and a lead outlet 14.
Detailed Description
The present invention will be further described with reference to the following detailed description and the accompanying fig. 1, but the present invention is not limited to these embodiments.
Example 1
230m adopted by a certain iron and steel enterprise3The fly ash treatment in blast furnace smelting needs about 60 tons of fly ash per day. Build a 60m3Fly ash storage tank of 120m3The mixture storage tank and a premixing and whirling device are adopted, and the other devices adopt original devices of a factory; the fly ash of the waste incineration power plant is transported to a treatment site by a closed tank truck, and is transported to a fly ash storage tank by air flow.
As shown in fig. 1, a blast furnace smelting fly ash treatment system comprises a closed tank car 1, a fly ash storage tank 2, a coal grinding device 3, a pulverized coal storage tank 4, a premixing and whirling device 5, a mixture storage tank 6, a blowing tank 7, a distributor 8, a spray gun 9 and a blast furnace 10;
the top end of the mixture storage tank 6 is provided with an explosion-proof hole 11; a coal injection port 12 is arranged at the hearth of the blast furnace 10, and a zinc recovery device 13 is arranged in a gas-liquid circulation area of a furnace body of the blast furnace 10; a lead outlet 14 is arranged at the bottom of the blast furnace 10;
the coal injection ports 12 are arranged around the wall of the blast furnace, and the number of the coal injection ports 12 is 8; the number of the spray guns 9 is 8;
the discharge port of the closed tank car 1 is connected with the feed port of the fly ash storage tank 2 through a pipeline, the discharge port of the coal grinding device 3 is connected with the feed port of the coal powder storage tank 4 through a pipeline, the discharge ports of the fly ash storage tank 2 and the coal powder storage tank 4 are respectively connected with the feed port of the premixing cyclotron equipment 5 through pipelines, the discharge port of the premixing cyclotron equipment 5 is sequentially connected with the mixture storage tank 6, the injection tank 7, the distributor 8 and the spray gun 9 through pipelines, and the nozzle of the spray gun 9 is connected to the coal injection port 12 at the hearth of the;
the treatment method of the blast furnace smelting fly ash treatment system comprises the following steps:
step 1, mixing:
conveying the fly ash in the closed tank car 1 to a fly ash storage tank 2 by adopting air flow conveying, wherein conveying gas adopts nitrogen; anthracite with the calorific value of 25000KJ is ground into coal powder with the granularity of less than 2mm in a coal grinding device 3 and is conveyed into a coal powder storage tank 4 through airflow; and then conveying the fly ash and the coal powder to a premixing rotary device 5 through a pipeline for uniform mixing, wherein the mixing mass ratio of the fly ash to the coal powder is 30: 70, preparing mixed powder, and conveying the mixed powder to a mixed material storage tank 6 for storage through airflow;
the position of a coal injection port 12 in a hearth of the blast furnace 10 is an injection area, the injection area is an oxidation environment, the temperature is 1600-1800 ℃, and dioxin in fly ash is oxidized at high temperature to become fuel to be burnt; a large amount of fluorine and chlorine enter the furnace slag, a small amount of fluorine and chlorine escape from the blast furnace 10 along with the gas in the form of hydrogen fluoride and hydrogen chloride acid gas, and the escaped gas is doped with hydrogen fluoride and hydrogen chloride acid gas, so that the corrosion to equipment in the subsequent use process of the gas is reduced, and the gas is adsorbed and deacidified by a magnesium hydroxide block during recovery;
the mixed powder flows away from the blowing area in the blast furnace 10 and enters other areas in the blast furnace 10, the other areas are all in reducing atmosphere, the metallic element lead in the fly ash is reduced into metal which falls into molten iron, the metal is not fused with the molten iron, the metal is deposited at the bottom of the blast furnace 10, and finally the metal is recovered through a lead outlet 14; the metal elements of zinc and cadmium in the fly ash are reduced into metal and gasified, the metal and other easily gasified metal are circularly enriched in a gas state in the blast furnace 10, and finally the metal is led out by a zinc recovery device 13 of the blast furnace 10 to be recovered and solidified; the metallic elements of copper, iron and manganese in the fly ash are reduced into metal which is directly dissolved in molten iron; aluminum, potassium, sodium and other active metal elements in the fly ash enter the slag in the form of compounds; after the silicon element in the fly ash is reduced, a small amount of silicon enters molten iron, and a large amount of silicon enters furnace slag;
after smelting in the blast furnace 10, all fly ash sprayed into the blast furnace 10 is treated harmlessly, and resource recycling is achieved;
in the embodiment, the influence of the sprayed fly ash on the slag alkalinity is considered, the alkalinity of the sintered ore is increased during sintering ore blending, the amount of silicon dioxide and the amount of aluminum oxide in the fly ash are detected, and the slag alkalinity is adjusted according to the sprayed amount; the coal powder is injected into the blast furnace at an injection speed of 8.0-8.8 tons/hour, the original injection speed of carbon powder in a factory is 4.1 tons/hour, the coke ratio of the blast furnace is not adjusted, and about 0.7 ton of coal powder is added to each ton of treated fly ash.
The blast furnace of the embodiment runs for 5 months, removes zinc once a week, and recovers about 5 tons of zinc each time; the lead is recovered once a month, and about 6 tons of lead are recovered each time; the alkalinity of the furnace slag is 1.0-1.1, the operation is normal, the corrosion phenomenon to the furnace body is not found, the concentration of the acid gas in the blast furnace gas is slightly increased, the gas is normally used after the acid is removed, and the dioxin is not detected in the gas.
Example 2
Using the blast furnace smelting fly ash treatment system of example 1, about 60 tons of fly ash was treated per day.
A treatment method of a blast furnace smelting fly ash treatment system comprises the following steps:
step 1, mixing:
conveying the fly ash in the closed tank car 1 to a fly ash storage tank 2 by adopting air flow conveying, wherein the conveying gas adopts dry air; anthracite with the calorific value of 25000KJ is ground into coal powder with the granularity of less than 2mm in a coal grinding device 3 and is conveyed into a coal powder storage tank 4 through airflow; and then conveying the fly ash and the coal powder to a premixing rotary device 5 through a pipeline for uniform mixing, wherein the mixing mass ratio of the fly ash to the coal powder is 35: 65, preparing mixed powder, conveying the mixed powder to the mixed material storage tank 6 through airflow, and storing;
the position of a coal injection port 12 in a hearth of the blast furnace 10 is an injection area, the injection area is an oxidation environment, the temperature is 1600-1800 ℃, and dioxin in fly ash is oxidized at high temperature to become fuel to be burnt; a large amount of fluorine and chlorine enter the furnace slag, a small amount of fluorine and chlorine escape from the blast furnace 10 along with the gas in the form of hydrogen fluoride and hydrogen chloride acid gas, and the escaped gas is doped with hydrogen fluoride and hydrogen chloride acid gas, so that the corrosion to equipment in the subsequent gas use process is reduced, and the gas is deacidified by spraying a sodium hydroxide solution during recovery;
the mixed powder flows away from the blowing area in the blast furnace 10 and enters other areas in the blast furnace 10, the other areas are all in reducing atmosphere, the metallic element lead in the fly ash is reduced into metal which falls into molten iron, the metal is not fused with the molten iron, the metal is deposited at the bottom of the blast furnace 10, and finally the metal is recovered through a lead outlet 14; the metal elements of zinc and cadmium in the fly ash are reduced into metal and gasified, the metal and other easily gasified metal are circularly enriched in a gas state in the blast furnace 10, and finally the metal is led out by a zinc recovery device 13 of the blast furnace 10 to be recovered and solidified; the metallic elements of copper, iron and manganese in the fly ash are reduced into metal which is directly dissolved in molten iron; aluminum, potassium, sodium and other active metal elements in the fly ash enter the slag in the form of compounds; after the silicon element in the fly ash is reduced, a small amount of silicon enters molten iron, and a large amount of silicon enters furnace slag;
after smelting in the blast furnace 10, all fly ash sprayed into the blast furnace 10 is treated harmlessly, and resource recycling is achieved;
in the embodiment, the influence of the sprayed fly ash on the slag alkalinity is considered, the alkalinity of the sintered ore is increased during sintering ore blending, the amount of silicon dioxide and the amount of aluminum oxide in the fly ash are detected, and the slag alkalinity is adjusted according to the sprayed amount; and (3) blowing into the blast furnace at a blowing speed of 7.0-7.2 tons/hour, wherein the blowing speed of the original carbon powder sprayed in the factory is 2.9 tons/hour, and the coke ratio is not adjusted in the embodiment. The calorific value of 25000KJ coal consumption is increased by about 0.7 ton when 1 ton of fly ash is treated.
The blast furnace of the embodiment runs for half a year, zinc is removed once a week, and about 4.5 tons of zinc are recovered each time; the lead is recovered once a month, and about 5 tons of lead are recovered each time; the alkalinity of the furnace slag is 1.0-1.1, the operation is normal, the corrosion phenomenon to the furnace body is not found, the concentration of the acid gas in the blast furnace gas is slightly increased, the gas is normally used after the acid is removed, and the dioxin is not detected in the gas.
Claims (2)
1. A blast furnace smelting fly ash treatment system is characterized by comprising a closed tank car (1), a fly ash storage tank (2), a coal grinding device (3), a pulverized coal storage tank (4), a premixing rotary device (5), a mixture storage tank (6), a blowing tank (7), a distributor (8), a spray gun (9) and a blast furnace (10);
the top end of the mixture storage tank (6) is provided with an explosion-proof hole (11); a coal injection port (12) is arranged at the hearth of the blast furnace (10), and a zinc recovery device (13) is arranged in a gas-liquid circulation area of a furnace body of the blast furnace (10); a lead outlet (14) is arranged at the bottom of the blast furnace (10);
the device is characterized in that a discharge port of the closed tank car (1) is connected with a feed inlet of the fly ash storage tank (2) through a pipeline, a discharge port of the coal grinding device (3) is connected with a feed inlet of the coal powder storage tank (4) through a pipeline, discharge ports of the fly ash storage tank (2) and the coal powder storage tank (4) are respectively connected with a feed inlet of the premixing and swirling device (5) through pipelines, a discharge port of the premixing and swirling device (5) is sequentially connected with the mixture storage tank (6), the blowing tank (7), the distributor (8) and the spray gun (9) through a pipeline, and a nozzle of the spray gun (9) is connected into a coal spraying.
2. The blast furnace smelting fly ash processing system according to claim 1, wherein the coal injection ports (12) are arranged around the wall of the blast furnace, and the number of the coal injection ports (12) is determined according to the scale of the blast furnace; the number of the spray guns (9) is equal to the number of the coal injection ports (12).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111793728A (en) * | 2020-07-09 | 2020-10-20 | 沈阳东大山汇环境科技有限公司 | Blast furnace smelting fly ash treatment system and treatment method thereof |
| CN114292969A (en) * | 2021-12-31 | 2022-04-08 | 湖南博一环保科技有限公司 | Method for co-processing waste incineration fly ash by blast furnace ironmaking |
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2020
- 2020-07-09 CN CN202021341288.6U patent/CN212335216U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111793728A (en) * | 2020-07-09 | 2020-10-20 | 沈阳东大山汇环境科技有限公司 | Blast furnace smelting fly ash treatment system and treatment method thereof |
| CN114292969A (en) * | 2021-12-31 | 2022-04-08 | 湖南博一环保科技有限公司 | Method for co-processing waste incineration fly ash by blast furnace ironmaking |
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