CN102607287B - Ferro-nickel smelting process waste heat generating system - Google Patents

Ferro-nickel smelting process waste heat generating system Download PDF

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Publication number
CN102607287B
CN102607287B CN2012101027500A CN201210102750A CN102607287B CN 102607287 B CN102607287 B CN 102607287B CN 2012101027500 A CN2012101027500 A CN 2012101027500A CN 201210102750 A CN201210102750 A CN 201210102750A CN 102607287 B CN102607287 B CN 102607287B
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China
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waste heat
steam turbine
ore
electric furnace
low
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CN2012101027500A
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Chinese (zh)
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CN102607287A (en
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石拓
严气概
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上海瑞恩能源投资有限公司
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

Abstract

A ferro-nickel smelting process waste heat generating system comprises at least one steam turbine island system, an ore-smelting electric furnace flue gas waste heat utilizing system, a rotary kiln flue gas waste heat utilizing system, an ore-smelting electric furnace slag flue gas waste heat utilizing system and an argon-oxygen decarburization (AOD) refining rotary kiln flue gas waste heat utilizing system. The steam turbine island system is composed of a steam turbine, a generator and a low-pressure gas-distributing cylinder and a medium-pressure gas-distributing cylinder, wherein the low-pressure gas-distributing cylinder and the medium-pressure gas-distributing cylinder are matched with the steam turbine. Medium-temperature medium-pressure superheated steam generated in the ore-smelting electric furnace slag flue gas waste heat utilizing system enters into the steam turbine through the medium-pressure gas-distributing cylinder so as to generate electricity, and low-pressure superheated steam generated in the rotary kiln flue gas waste heat utilizing system enters into the steam turbine through the low-pressure gas-distributing cylinder so as to generate electricity. Medium-temperature medium-pressure superheated steam generated in the ore-smelting electric furnace slag flue gas waste heat utilizing system enters into the steam turbine through the medium-pressure gas-distributing cylinder so as to generate electricity, and low-temperature low-pressure superheated steam generated in the ore-smelting electric furnace slag flue gas waste heat utilizing system enters into the steam turbine through the low-pressure gas-distributing cylinder so as to generate electricity. Steam generated by the AOD refining rotary kiln flue gas waste heat utilizing system serves as another level of supplemented steam to enter into the steam turbine to generate electricity.

Description

The nickel iron smelting process afterheat generating system
Technical field
The present invention relates to a kind of smelting UTILIZATION OF VESIDUAL HEAT IN technology, refer in particular to a kind of nickel iron smelting process afterheat generating system.
Background technology
The smelting process of take the laterite nickel ore as raw material, producing at present primary nickel can be divided into two kinds of pyrometallurgy and hydrometallurgys, and rotary kiln-ore-smelting electric furnace smelting technology is that the RKEF smelting process is a kind of of pyrometallurgy.
Production procedure during typical case RKEF smelting process is applied at home and technique general introduction:
(1) ore flow process
Stock yard-→ dry kiln-→ screening, fragmentation and mixing dosage-→ rotary kiln-→ ore-smelting electric furnace slightly refines-→ desulfurization of iron bag-→ refining converter-→ casting.
(2) technique general introduction
The kiln drying of ore drying is dry, and after lime stone, reducing agent sieved fragmentation at stock yard, between getting the raw materials ready, mixing dosage was sent into rotary kiln.Return in brickkiln, raw material drying, roasting, prereduction, make the approximately nickel slag of 1000 ℃ again.The nickel slag is sent into ore-smelting electric furnace under the sealing state of thermal isolation.Ore-smelting electric furnace is totally enclosed type, self-baking electrode, and submerged arc is smelted, and reduces and melts minute raw ferro nickel and slag, produces and contains approximately 70%~75% low heat value flue gas of CO simultaneously, and flue gas is delivered to the rotary kiln burner through purification, acts as a fuel together with coal dust and supplies to rotary kiln.The ore-smelting electric furnace slag after shrend as construction material.The ore-smelting electric furnace product is raw ferro nickel, adds in advance desulfurizing agent before tapping a blast furnace, the desulfurization simultaneously of tapping a blast furnace.Raw ferro nickel is delivered to AOD refining converter oxygen decarburization, and the ferronickel after refining is cast conforming articls ferronickel piece.
In present domestic nickel iron smelting process, the state of flue gas, UTILIZATION OF VESIDUAL HEAT IN is as follows:
1, the low heat value flue gas of ore-smelting electric furnace generation, send into rotary kiln through purification and act as a fuel together with coal dust.
2, the flue gas that produces of rotary kiln, deliver to dry kiln together with coal dust after the dried feed ore, through dedusting
Device purifies, to smoke stack emission.
3, the flue gas of AOD refining furnace generation, through water-cooled flue or gasification cooling flue, and after aerial cooler is cooling, purify through deduster, to smoke stack emission; The hot water that water-cooled flue produces is for production, or cooling through cooling tower, in the heat loss atmosphere; Or hot for production or life through the gasification cooling flue producing steam; The aerial cooler air is taken away in the heat loss atmosphere.
4, in ore-smelting electric furnace high temperature furnace slag hardening, approximately 10% vaporization is scattered and disappeared, and circulating cooling water cooling hardening, heat scatters and disappears in atmosphere through cooling tower, is not also utilized.
As seen, in nickel iron smelting process, residual heat resources are abundant, though but the hot water or the steam that produce obtain part, but still use the form of vapour and water as heat carrier, therefore hot user is limited.What most domestic smelting process thermal resource directly scattered and disappeared is still a kind of comparatively general phenomenon.It is the major reason that causes industry high energy consumption, thermal resource waste; Also to cause the environment greenhouse gas emission excessive, the main cause of high pollution.
Therefore, how to solve ferronickel from ore heating start, through ore-smelting electric furnace slightly refine, the desulfurization of iron bag, refining converter and even slag water quenching process in the high-performance problem of complex utilization of generation flue gas in all process steps, be the large problem of one in the industry and comprehensive environmental improvement always.
Summary of the invention
Purpose of the present invention: be intended to propose a kind of method that in package solution nickel iron smelting process, fume afterheat utilizes, both improved fume afterheat local use rate in traditional nickel iron smelting process, reduced energy consumption, also reduce greenhouse gas emission simultaneously, alleviate environmental pollution.
the foregoing invention purpose realizes by following technological approaches: ore-smelting electric furnace fume afterheat in whole nickel iron smelting process is produced system, the rotary kiln fume afterheat produces system, ore-smelting electric furnace slag fume afterheat produces system and AOD refining converter fume afterheat produces system, set up into respectively corresponding ore-smelting electric furnace smoke waste heat utilization system 5, rotary kiln smoke waste heat utilization system 7, ore-smelting electric furnace slag smoke waste heat utilization system 6 and AOD refining converter smoke waste heat utilization system 8, and with above-mentioned each smoke waste heat utilization system, combine with at least one steamer electricity generation system A, be built into the nickel iron smelting process afterheat generating system.
This nickel iron smelting process afterheat generating system, comprise at least one Turbine Island system A; And ore-smelting electric furnace smoke waste heat utilization system 5, rotary kiln smoke waste heat utilization system 7, ore-smelting electric furnace slag smoke waste heat utilization system 6 and an AOD refining converter smoke waste heat utilization system 8; Described Turbine Island system reaches low pressure sub-cylinder 3 and the middle pressure sub-cylinder 4 supporting with steam turbine by steam turbine 1, generator 2 and forms; Wherein press sub-cylinder 4 to enter steam turbine 1 generating in ore-smelting electric furnace smoke waste heat utilization system 5 in the medium temperature and medium pressure superheated steam of output warp; The low-pressure superheated steam that rotary kiln smoke waste heat utilization system 7 produces enters steam turbine 1 generating through low pressure sub-cylinder 3; Press sub-cylinder 4 to enter steam turbine 1 generating in the medium temperature and medium pressure superheated steam warp that ore-smelting electric furnace slag smoke waste heat utilization system 6 produces, the low-temp low-pressure superheated steam of its generation enters steam turbine 1 generating through 3 of low pressure sub-cylinders; Filling enters steam turbine 1 generating to the steam that AOD refining converter smoke waste heat utilization system 8 produces as another grade.
This nickel iron smelting process afterheat generating system according to above technical scheme proposition, by the combination with afterheat generating system and each fume afterheat discharge phase of whole nickel iron smelting process, but the waste heat that produces in each operation stage in the local use nickel iron smelting process on the one hand, reduce greenhouse gas emission, reduce environmental pollution; , by cogeneration, directly supply with business electrical, guarantee to produce simultaneously.
Description of drawings
Fig. 1 is the structural representation of afterheat generating system of the present invention.
In figure: 1 ?steam turbine 2 ?generator 3 ?low pressure sub-cylinder 4 ?in press sub-cylinder 5 ?ore-smelting electric furnace smoke waste heat utilization system 6-ore-smelting electric furnace slag smoke waste heat utilization system 7-rotary kiln smoke waste heat utilization system 8 ?AOD refining converter smoke waste heat utilization system A-Turbine Island.
The specific embodiment
Further set forth the present invention below in conjunction with Figure of description, and provide embodiments of the invention.
This nickel iron smelting process afterheat generating system as shown in Figure 1, comprise at least one Turbine Island system A; And ore-smelting electric furnace smoke waste heat utilization system 5, rotary kiln smoke waste heat utilization system 7, ore-smelting electric furnace slag smoke waste heat utilization system 6 and an AOD refining converter smoke waste heat utilization system 8; Described Turbine Island system A reaches low pressure sub-cylinder 3 and the middle pressure sub-cylinder 4 supporting with steam turbine by steam turbine 1, generator 2 and forms; Wherein press sub-cylinder 4 to enter steam turbine 1 generating in ore-smelting electric furnace smoke waste heat utilization system 5 in the medium temperature and medium pressure superheated steam of output warp; The low-pressure superheated steam that rotary kiln smoke waste heat utilization system 7 produces enters steam turbine 1 generating through low pressure sub-cylinder 3; Press sub-cylinder 4 to enter steam turbine 1 generating in the medium temperature and medium pressure superheated steam warp that ore-smelting electric furnace slag smoke waste heat utilization system 6 produces, the low-temp low-pressure superheated steam of its generation enters steam turbine 1 generating through 3 of low pressure sub-cylinders; Filling enters steam turbine 1 generating to the steam that AOD refining converter smoke waste heat utilization system 8 produces as another grade.
Wherein, in ore-smelting electric furnace smoke waste heat utilization system 5, mineral hot furnace low heat value high-temperature flue gas after fully burning, is sent into waste heat boiler and is carried out heat exchange, produces medium temperature and medium pressure steam, for steam turbine 1 generating; Flue gas after deduster, is delivered to smoke stack emission by air-introduced machine.
In rotary kiln smoke waste heat utilization system 7, in rotary kiln, low-temperature flue gas is sent into waste heat boiler and is carried out heat exchange, produces low-pressure superheated steam, sends into steam turbine 1 filling generating; Flue gas after deduster, is delivered to another smoke stack emission by air-introduced machine.
Press sub-cylinder 4 to enter steam turbine 1 generating in the medium temperature and medium pressure superheated steam warp that described ore-smelting electric furnace slag smoke waste heat utilization system 6 produces, the low-temp low-pressure superheated steam of its generation enters steam turbine 1 generating through 3 of low pressure sub-cylinders; The slag flue gas that has carried out heat exchange is emptying by chimney after dust suction is processed.
The steam that described AOD refining converter smoke waste heat utilization system 8 produces, can be used as another grade filling and enter steam turbine 1 generating, and the low-temperature flue gas that has carried out heat exchange is emptying by chimney after dust suction is processed.。
In the present invention, reasonable introducing due to afterheat generating system (Turbine Island system), under the prerequisite that does not affect the former technique of nickel-iron smelting, the fume afterheat resource of nickel iron smelting process is rationally fully utilized, producing steam generates electricity on the spot for the production of electricity consumption, both reduce energy consumption of unit product, and can reduce greenhouse gas emission again, improved energy utilization rate.
The present invention proposes brand-new nickel iron smelting process UTILIZATION OF VESIDUAL HEAT IN route, the heat energy ladder is utilized, reclaim heat energy, produce on the spot electric energy, reduced the loss in the power delivery process, for the such big power consumer of metallurgy industry, be energy-conservation effective way, guaranteed again production.
For metallurgy industry enterprise, build afterheat generating system, to invest littlely, instant effect, can significantly reduce the metallurgical production energy consumption, correspondingly can significantly improve Business Economic Benefit.For the sustainable development of China's economy and society, energy-conservation is when last very urgent task.Energy-conservation necessary dependence technology, do not have corresponding technical support, and energy-saving and emission-reduction will become an empty verbiage so.Simultaneously ferronickel rotary kiln-ore-smelting electric furnace smelting process is introduced China or primary stage, its maturation, improves for China's metallurgy industry development special meaning is also arranged.The present invention is based on whole nickel iron smelting process, the introducing cogeneration technology of innovation, to nickel iron smelting process, especially the Utilizing Energy Sources in Reason of rotary kiln-ore-smelting electric furnace smelting process has been made actively, has effectively been explored, and for the energy-saving and emission-reduction of China and the development of metallurgy industry, very important meaning is arranged.

Claims (1)

1. a nickel iron smelting process afterheat generating system, comprise at least one Turbine Island system; And ore-smelting electric furnace smoke waste heat utilization system, rotary kiln smoke waste heat utilization system, ore-smelting electric furnace slag smoke waste heat utilization system and an AOD refining converter smoke waste heat utilization system; Described Turbine Island system reaches low pressure sub-cylinder (3) and the middle pressure sub-cylinder (4) supporting with steam turbine by steam turbine (1), generator (2) and forms; Wherein press sub-cylinder (4) to enter steam turbine (1) generating in ore-smelting electric furnace smoke waste heat utilization system (5) in the medium temperature and medium pressure superheated steam of output warp; The low-pressure superheated steam that rotary kiln smoke waste heat utilization system (7) produces enters steam turbine (1) generating through low pressure sub-cylinder (3); Press sub-cylinder (4) to enter steam turbine (1) generating in the medium temperature and medium pressure superheated steam warp that ore-smelting electric furnace slag smoke waste heat utilization system (6) produces, the low-temp low-pressure superheated steam of its generation enters steam turbine (1) generating through low pressure sub-cylinder (3); Filling enters steam turbine (1) generating to the steam that AOD refining converter smoke waste heat utilization system (8) produces as another grade.
CN2012101027500A 2012-04-10 2012-04-10 Ferro-nickel smelting process waste heat generating system CN102607287B (en)

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CN102936640B (en) * 2012-11-23 2014-05-14 福建鼎信实业有限公司 Technique for smelting stainless steel through RKEF (rotary kiln-electric furnace) and AOD furnace duplex process
CN103233788B (en) * 2013-04-25 2015-07-08 杭州汽轮机股份有限公司 Extra-low-pressure and negative-pressure steam inlet and supply type turbine cylinder and operating method thereof
CN103899365A (en) * 2014-03-02 2014-07-02 成都成发科能动力工程有限公司 Power generation device and method using medium-temperature and medium-pressure steam and low-pressure saturated steam in metallurgical industry

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JPH04191307A (en) * 1990-11-26 1992-07-09 Mitsubishi Heavy Ind Ltd Smelting reduction iron manufacturing device
JPH10152710A (en) * 1996-11-22 1998-06-09 Nippon Steel Corp Equipment for recovering waste heat or smelting reduction furnace
CN100338424C (en) * 2004-09-30 2007-09-19 中信重型机械公司 Generating set system of simple low temperature waste heat from large size cement manufacture line in dry method, and technical process
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CN202648447U (en) * 2012-04-10 2013-01-02 上海瑞恩能源投资有限公司 Waste heat electricity generation system in ferronickel smelting craft

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