CN104131127A - RKEF process nickel-iron smelting waste heat utilizing method - Google Patents
RKEF process nickel-iron smelting waste heat utilizing method Download PDFInfo
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- CN104131127A CN104131127A CN201410362647.9A CN201410362647A CN104131127A CN 104131127 A CN104131127 A CN 104131127A CN 201410362647 A CN201410362647 A CN 201410362647A CN 104131127 A CN104131127 A CN 104131127A
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Abstract
The invention discloses an RKEF process nickel-iron smelting waste heat utilizing method. The method comprises that electric furnace high-temperature flue gas is subjected to heat exchange with normal-temperature air by a heat exchanger, and then 350-450 DEG C hot air obtained from heat exchange is used as secondary air required for rotary kiln injection coal combustion and is sent into a rotary kiln for utilization. Further, high-temperature flue gas discharged by the rotary kiln is firstly dedusted, then blown into an air mixing chamber of a drying kiln by a blower to be mixed with high-temperature flue gas generated by a combustion chamber of the drying kiln, and thus obtained 350-450 DEG C flue gas as a heat source of the drying kiln is utilized. The method realizes full utilization of the electric furnace high-temperature flue gas; and the waste heat utilization method has high heat utilization rate, saves coal consumption, reduces carbon emissions and sulfur emissions in the atmosphere, and has obvious economic benefits and social benefits.
Description
Technical field
Iron alloy of the present invention is produced residual heat integrative and is utilized field, is specifically related to a kind of RKEF technique nickel-iron smelting residual-heat utilization method.
Background technology
Ferronickel is the important source material of producing stainless steel and Heat resisting cast steel etc., adds nickel can improve the solidity to corrosion of steel, the tensile strength of improving steel, cold deformation and welding property etc. in steel, is widely used in the fields such as machinery, medical treatment, national defence, light industry.The nickel being provided by ferronickel has at present accounted for the more than 50% of global required nickel amount, and China reaches more than 75% for 2013, and proportion can be increasing.
Ferronickel is especially rapid with RKEF technological development in producing, this Technology maturation, equipment is simple and easy to control, production efficiency is high, accepted by increasing enterprise, but this technique weak point is to need to consume a large amount of coal or metallurgical coke and electric energy, and energy consumption is large, production cost is high, the fusion process quantity of slag too much, smelting temperature is higher, have dust pollution etc.So, must recycle the high-temperature flue gas producing in production process, not so energy dissipation is too large, but how efficiently, reasonably the high-temperature flue gas that utilizes electric furnace and rotary kiln to produce, do not exert an influence the key point that is this UTILIZATION OF VESIDUAL HEAT IN technical study to the production control of electric furnace and rotary kiln again.
Existing RKEF technique is as shown in Fig. 1 (simple process block diagram), laterite is transported to outdoor stockyard in factory and stores, first through screening and broken before using, the accept of afterwards broken≤200mm is sent into indoor stockyard and is stored, it is dry that indoor laterite is sent into dry kiln by belt after forklift batching, moisture is dried to 20% from 35%, and dry ore storage bin is sent in dry kiln dry ore deposit out after screening.Do ore deposit and go back raw coal and send into rotary kiln baking after proportioning station batching, rotary kiln high temperature calcining is out transported to electric furnace furnace top bin, and calcining joins in stove and smelts from furnace top bin.The thick nickelalloy that electric furnace is emitted obtains smart nickelalloy after stirring desulphurization, and smart nickelalloy pours into the shipping of nickelalloy piece packaging through liquid filling machine.As can be seen here, dry kiln operation, rotary kiln operation and electric furnace operation in RKEF technique all need to consume a large amount of energy, and energy consumption is large, and production cost is high.
The Sichuan wide industry (group) of gold limited-liability company is at 2 RKEF technique ferronickel production lines of the large southwestern facing-port industry of Guangxi Fangcheng Port garden investment construction, set up Guangxi Gold Yuan Nie industry company limited, two production lines are gone into operation in succession in January, 2011 and March.In the project technical scheme demonstration stage, how company utilizes and carries out technical study the waste heat producing in production process with regard to organizing specially person skilled to set up seminar, and more domestic and international RKEF ferronickel manufacturing enterprise UTILIZATION OF VESIDUAL HEAT IN present situations are investigated, in conjunction with company actual situation, work out a kind of reasonable, efficient UTILIZATION OF VESIDUAL HEAT IN technology, obtained considerable economic benefit.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method that RKEF technique nickel-iron smelting waste heat rationally utilizes.
The technical solution adopted for the present invention to solve the technical problems is: RKEF technique nickel-iron smelting residual-heat utilization method, electric furnace high-temperature flue gas is carried out to heat exchange with interchanger and normal temperature air, and heat exchange becomes the warm air of 350～450 DEG C to send into rotary kiln utilization as the rotary kiln coal powder injection required secondary air of burning.
Wherein, in aforesaid method, the high-temperature flue gas that rotary kiln is discharged, first through dedusting, then blasts dry kiln wind mixed chamber with blower fan and mixes with the high-temperature flue gas of dry kiln combustion chamber generation, obtains the flue gas of 350～450 DEG C as the thermal source utilization of dry kiln.
Wherein, in aforesaid method, the useless flue gas that dry kiln is discharged through electric precipitator gather dust, flue gas desulfurization (FGD) unit removes SO
2rear discharge.
Wherein, in aforesaid method, the temperature of described electric furnace high-temperature flue gas is 950～1000 DEG C.
Wherein, in aforesaid method, described electric furnace high-temperature flue gas first sends into the mixed wind of wind mixed chamber, carry out heat exchange with interchanger and normal temperature air again after cooling to 700～800 DEG C.
Wherein, in aforesaid method, electric furnace high-temperature flue gas discharges after sack cleaner gathers dust with the useless flue gas that interchanger and normal temperature air carry out after heat exchange.
Wherein, in aforesaid method, the temperature of the high-temperature flue gas that rotary kiln is discharged is 300～350 DEG C.
Wherein, in aforesaid method, the temperature of the high-temperature flue gas that dry kiln combustion chamber produces is 650～750 DEG C.
The invention has the beneficial effects as follows: the warm air that the present invention utilizes interchanger to convert electric furnace high-temperature flue gas to suitable temp scope is used as rotary kiln secondary air, solve because electric furnace high-temperature oxygen content of smoke gas is low, dust content is large, the shortcoming that can not directly be utilized, after utilization, greatly save rotary kiln coal powder injection powder amount.The present invention carries out dedusting to rotary kiln flue gas, solve because of the shortcoming that rotary kiln flue-gas temperature is high, dust content is too large to high-temperature blower damage in impeller greatly, then after directly rotary kiln flue gas being sent into high-temperature flue gas that dry kiln wind mixed chamber and dry kiln combustion chamber produce and being mixed, as dry kiln thermal source, realized the abundant recycling of rotary kiln fume afterheat.Residual-heat utilization method heat utilization efficiency of the present invention is high, has saved coal consumption, has reduced " carbon " discharge and " sulphur " discharge in atmosphere, has obvious economic benefit and social benefit.
Brief description of the drawings
Fig. 1 is existing RKEF process flow diagram;
Fig. 2 is the process flow diagram of RKEF technique nickel-iron smelting UTILIZATION OF VESIDUAL HEAT IN of the present invention.
Embodiment
As shown in Figure 2, the inventive method specifically can be implemented in such a way:
RKEF technique nickel-iron smelting residual-heat utilization method of the present invention, electric furnace high-temperature flue gas cools to 700～800 DEG C through the mixed wind of wind mixed chamber, then carry out heat exchange through interchanger and normal temperature air, heat exchange becomes the warm air of 350～450 DEG C as the rotary kiln coal powder injection required secondary air of burning, and 190～220 DEG C of useless flue-gas temperatures after heat exchange are discharged from Environment protection chimney after sack cleaner gathers dust; 300～350 DEG C of elder generations of rotary kiln high-temperature flue gas are through tornado dust collector dedusting, then blasting dry kiln wind mixed chamber by high-temperature blower mixes with the high-temperature flue gas that dry kiln combustion chamber produces, obtain the flue gas of 350～450 DEG C as the thermal source of dry kiln, the useless flue gas of 150～180 DEG C that dry kiln is discharged through electric precipitator gather dust, flue gas desulfurization (FGD) unit removes SO
2after discharge from Environment protection chimney.
Wherein, the temperature of described electric furnace high-temperature flue gas is generally 950～1000 DEG C; The temperature of the high-temperature flue gas that dry kiln combustion chamber produces is generally 650～750 DEG C.
Below by embodiment, the specific embodiment of the invention is described further, but therefore protection scope of the present invention is not limited among embodiment.
Embodiment mono-
Certain factory adopts RKEF explained hereafter ferronickel, 950 DEG C of electric furnace high-temperature flue gases, exhaust gas volumn 24370Nm
3/ h, through wind mixed chamber, mixed wind cools to 750 DEG C, and exhaust gas volumn becomes 29134Nm
3/ h, produces the warm air of 400 DEG C after heat exchange, air capacity is 51048Nm
3/ h, warm air can be saved 5942 tons of coal consumptions every year as rotary kiln coal powder injection burning secondary air; 300 DEG C of rotary kiln flue-gas temperatures, exhaust gas volumn 90239Nm
3/ h, after tornado dust collector gather dust, flue-gas temperature is reduced to 250 DEG C, blasts dry kiln wind mixed chamber can save every year 6297 tons of coal consumptions as dry kiln thermal source by high-temperature blower.Two UTILIZATION OF VESIDUAL HEAT IN can reduce 7904 tons of " carbon " discharges every year, 98 tons of " sulphur " discharges, and also whole bootstrap system is stable, has obtained obvious economic benefit and social benefit.
Embodiment bis-
Certain factory adopts RKEF explained hereafter ferronickel, 1000 DEG C of electric furnace high-temperature flue gases, exhaust gas volumn 22628Nm
3/ h, through wind mixed chamber, mixed wind cools to 750 DEG C, and exhaust gas volumn becomes 28158Nm
3/ h, produces the warm air of 400 DEG C after heat exchange, air capacity is 49322Nm
3/ h, warm air can be saved 5741 tons of coal consumptions every year as rotary kiln coal powder injection burning secondary air; 350 DEG C of rotary kiln flue-gas temperatures, exhaust gas volumn 88235Nm
3/ h, after tornado dust collector gather dust, flue-gas temperature is reduced to 300 DEG C, blasts dry kiln wind mixed chamber can save every year 6442 tons of coal consumptions as dry kiln thermal source by high-temperature blower.Two UTILIZATION OF VESIDUAL HEAT IN can reduce 7868 tons of " carbon " discharges every year, 97.6 tons of " sulphur " discharges, and also whole bootstrap system is stable, has obtained obvious economic benefit and social benefit.
Claims (8)
1.RKEF technique nickel-iron smelting residual-heat utilization method, is characterized in that: electric furnace high-temperature flue gas interchanger and normal temperature air are carried out to heat exchange, and heat exchange becomes the warm air of 350～450 DEG C to send into rotary kiln utilization as the rotary kiln coal powder injection required secondary air of burning.
2. RKEF technique nickel-iron smelting residual-heat utilization method according to claim 1, it is characterized in that: the high-temperature flue gas that rotary kiln is discharged is first through dedusting, then blast with blower fan the high-temperature flue gas that dry kiln wind mixed chamber and dry kiln combustion chamber produce and mix, obtain the flue gas of 350～450 DEG C as the thermal source utilization of dry kiln.
3. RKEF technique nickel-iron smelting residual-heat utilization method according to claim 2, is characterized in that: the useless flue gas that dry kiln is discharged through electric precipitator gather dust, flue gas desulfurization (FGD) unit removes SO
2rear discharge.
4. according to the RKEF technique nickel-iron smelting residual-heat utilization method described in claim 1,2 or 3, it is characterized in that: the temperature of described electric furnace high-temperature flue gas is 950～1000 DEG C.
5. according to the RKEF technique nickel-iron smelting residual-heat utilization method described in claim 1,2 or 3, it is characterized in that: described electric furnace high-temperature flue gas first sends into the mixed wind of wind mixed chamber, carry out heat exchange with interchanger and normal temperature air again after cooling to 700～800 DEG C.
6. according to the RKEF technique nickel-iron smelting residual-heat utilization method described in claim 1,2 or 3, it is characterized in that: the useless flue gas that electric furnace high-temperature flue gas interchanger and normal temperature air carry out after heat exchange discharges after sack cleaner gathers dust.
7. according to the RKEF technique nickel-iron smelting residual-heat utilization method described in claim 2 or 3, it is characterized in that: the temperature of the high-temperature flue gas that rotary kiln is discharged is 300～350 DEG C.
8. according to the RKEF technique nickel-iron smelting residual-heat utilization method described in claim 2 or 3, it is characterized in that: the temperature of the high-temperature flue gas that dry kiln combustion chamber produces is 650～750 DEG C.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104451349A (en) * | 2014-12-12 | 2015-03-25 | 福建鼎信实业有限公司 | Stainless steel and smelting process thereof |
| CN106766952A (en) * | 2016-11-29 | 2017-05-31 | 攀钢集团钛业有限责任公司 | The method that mineral are dried using electric furnace flue gas |
| CN107746974A (en) * | 2017-11-20 | 2018-03-02 | 临沂鑫海新型材料有限公司 | Electric furnace coal-gas recovering utilizes device in RKEF method smelting ferronickels |
| CN108411116A (en) * | 2018-05-16 | 2018-08-17 | 金川集团股份有限公司 | A kind of lateritic nickel ore RKEF smelting processes smoke gas comprehensive treatment system and method |
| CN110592398A (en) * | 2019-10-30 | 2019-12-20 | 阳江翌川金属科技有限公司 | Ferronickel production facility |
| CN113790589A (en) * | 2021-09-22 | 2021-12-14 | 新疆宜化化工有限公司 | Process and device for realizing energy-saving and efficient drying of carbide slag |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102703730A (en) * | 2012-06-18 | 2012-10-03 | 中国恩菲工程技术有限公司 | Method for smelting nickel matte by using lateritic nickel ore |
-
2014
- 2014-07-28 CN CN201410362647.9A patent/CN104131127B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102703730A (en) * | 2012-06-18 | 2012-10-03 | 中国恩菲工程技术有限公司 | Method for smelting nickel matte by using lateritic nickel ore |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104451349A (en) * | 2014-12-12 | 2015-03-25 | 福建鼎信实业有限公司 | Stainless steel and smelting process thereof |
| CN106766952A (en) * | 2016-11-29 | 2017-05-31 | 攀钢集团钛业有限责任公司 | The method that mineral are dried using electric furnace flue gas |
| CN107746974A (en) * | 2017-11-20 | 2018-03-02 | 临沂鑫海新型材料有限公司 | Electric furnace coal-gas recovering utilizes device in RKEF method smelting ferronickels |
| CN108411116A (en) * | 2018-05-16 | 2018-08-17 | 金川集团股份有限公司 | A kind of lateritic nickel ore RKEF smelting processes smoke gas comprehensive treatment system and method |
| CN110592398A (en) * | 2019-10-30 | 2019-12-20 | 阳江翌川金属科技有限公司 | Ferronickel production facility |
| CN113790589A (en) * | 2021-09-22 | 2021-12-14 | 新疆宜化化工有限公司 | Process and device for realizing energy-saving and efficient drying of carbide slag |
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