Recovery and comprehensive-utilization process for waste heat in dry-process treatment of iron-making slag in blast furnace

A technology of blast furnace ironmaking and waste heat recovery, which is applied in the field of steelmaking technology, can solve the problems of serious resource loss, comprehensive utilization limitation, and large process area, and achieve the effect of improving economic benefits and maximizing the use of resource benefits

Inactive Publication Date: 2017-11-28

王宏伟

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AI-Extracted Technical Summary

Problems solved by technology

[0004] The existing water-quenched slag process, a large amount of heat energy in the slag is forced to be converted into water vapor to be released, the process occupies a large area, the resource loss is serious, and the comprehensive utilization is limited; the liquid s...

Method used

1350~1450 ℃ of high-temperature flue gas can realize not spraying water to drop to about 200 ℃; Flue gas waste heat is converted into steam recovery power generation; The heat pipe accumulates dust, and the flue gas channel is not blocked, which is reliable; the flue gas passes through the waste heat boiler, and due to the special structure of the special waste heat boiler, it will not explode, which is safe. Gas pure dry dedusting and synchronous heat energy recovery process and waste heat boiler" (Patent No. ZL201010603498.2) has been introduced systematically; the periodi...

Abstract

The invention provides a recovery and comprehensive-utilization process for waste heat in dry-process treatment of iron-making slag in a blast furnace. The recovery and comprehensive-utilization process comprises the following steps: (S1) the blast-furnace slag enters a buffering tank through a slag drying trough, the heat of the slag is recovered by hot air in the buffering tank, and then the temperature of the slag is reduced; (S2) flue gas carrying the heat of the slag enters a waste-heat boiler through a pipeline, water steam is heated by heat exchange in the waste-heat boiler, and enters power generation equipment to be converted into electric energy; (S3) after heat exchange, the flue gas enters a dust remover for dust removal, and after dust removal, the flue gas enters a blow-off tower for exhaustion by a fan; and (S4) after temperature reduction, the slag enters a brick casting chain belt for casting and molding, and then enters a cold bed for package and storage. The recovery and comprehensive-utilization process provided by the invention has the advantages of safety, reliability, stability and benefit, and can create economic benefit while realizing recovery of the waste heat of the slag.

Application Domain

Increasing energy efficiencyRecycling and recovery technologies +1

Technology Topic

SlagElectric energy +9

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Examples

Experimental program(1)

Example Embodiment

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] according to figure 1 As shown, the comprehensive utilization process of waste heat recovery and comprehensive utilization of blast furnace ironmaking slag dry slag treatment shown in the embodiment comprises the following steps:

[0020] S1, the blast furnace slag enters the buffer tank through the dry slag ditch, and the heat of the slag is recovered by hot air in the buffer tank, and the temperature of the slag is reduced;

[0021] S2, the temperature of the flue gas carrying the heat of the slag is 1350-1450 ℃, the flue gas enters the waste heat boiler through the pipeline, and the water vapor is heated by heat exchange in the waste heat boiler, and the water steam enters the power generation equipment and is converted into electric energy;

[0022] S3, the temperature of the flue gas after heat exchange is 160-200℃, the flue gas enters the dust collector for dust removal, and the dust content of the flue gas after dust removal is reduced to 20mg/m 3 Below, after dust removal, it enters the dispersion tower through the fan and is discharged;

[0023] S4, the slag with reduced temperature enters the cast brick chain belt for casting and molding, and then enters the cooling bed for packaging and storage.

[0024] The recycling dust removal process has the following characteristics:

[0025] 1. The high temperature flue gas at 1350~1450℃ is converted into steam for recovery:

[0026] 2. Slag is not quenched by water

[0027] 3. The flue gas is not cooled by water spray, and the flue gas is pure dry flue gas;

[0028] 4. The flue gas dust removal is dry fine dust removal:

[0029] It has been verified by the base number theory:

[0030] The high temperature flue gas at 1350-1450 ℃ can be reduced to about 200 ℃ without spraying water; the waste heat of the flue gas is converted into steam for recovery and power generation; the high temperature flue gas containing a small amount of dust passes through the waste heat boiler and adopts automatic ash cleaning, which can clean the heat exchange tube area. Ash and flue gas passages are not blocked, which is reliable; flue gas passes through the waste heat boiler, due to the particularity of the special waste heat boiler structure, it will not explode and is safe. The system has been introduced in "Dedusting and Synchronous Heat Recovery Process and Waste Heat Boiler" (Patent No. ZL201010603498.2); the periodic variability of flue gas, due to the special structure to ensure steam-water circulation, the operation of waste heat boiler is stable.

[0031] Since the present invention does not use the water flushing water cooling process, the molten slag can be effectively recovered at high temperature in the cooling stage, and converted into heat energy to generate steam through the (waste heat boiler). The molten slag is heated by constant temperature stirring in the buffer tank, adding additives and other processes, and uniformly cast and formed (bricks, special cylinders, etc.) to make building materials, which are suitable for urban construction and other uses. Discharge from the venting tower, the process of this equipment becomes wasteful to recover valuable resources.

[0032] The heat energy of the flue gas is converted into steam recovery, and the steam can be used to generate electricity. The special slag-making bricks can meet the needs of new urban road high-speed illuminators, wear-resistant, beautiful and long-life use, enhance the value of attached products, and process emission optimization is in line with the new national environmental protection policy. Since water quenching is not used to make water, release water vapor and carry water with slag, water saving is also in line with the national environmental governance policy.

[0033] The blast furnace slag dry treatment and waste heat recovery slag product reuse process provided by the invention, the generated high temperature flue gas does not burn and explode in the waste heat boiler, and the operation is smooth, so that 1350~1350~ The high-temperature flue gas at 1450°C is cooled by dry method, and the heat energy is recycled and reused. At the same time, the flue gas is discharged in environmental protection.

[0034] Comparison table of performance parameters and benefits of the present invention and water slag treatment process (according to 1000M3 blast furnace)

[0035]

[0036]

[0037]

[0038]

[0039] The above process is adopted to achieve environmental protection standards and high-efficiency recycling, which is suitable for energy-saving projects of iron and steel enterprises. The process has safety, reliability, stability and efficiency, and at the same time realizes the recovery of slag waste heat and creates economic benefits.

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Classification and recommendation of technical efficacy words

Improve economic efficiency
Maximize resource utilization

Fracturing fluid for controlling extension of fracture and fracturing method

ActiveCN102925133AImprove economic efficiency

Owner:PETROCHINA CO LTD +1

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ActiveCN102361334AImprove economic efficiencyImprove absorption efficiency

Owner:SHENZHEN POWER SUPPLY BUREAU +1

Recovery and comprehensive-utilization process for waste heat in dry-process treatment of iron-making slag in blast furnace

AI-Extracted Technical Summary

Problems solved by technology

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Abstract

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Description & Claims & Application Information

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