CN103822495A - Energy-saving emission-reducing yield-increasing method for DC-resistor electric heating equipment - Google Patents
Energy-saving emission-reducing yield-increasing method for DC-resistor electric heating equipment Download PDFInfo
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- CN103822495A CN103822495A CN201210468877.4A CN201210468877A CN103822495A CN 103822495 A CN103822495 A CN 103822495A CN 201210468877 A CN201210468877 A CN 201210468877A CN 103822495 A CN103822495 A CN 103822495A
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Abstract
The invention provides an energy-saving emission-reducing yield-increasing method for DC-resistor electric heating equipment. The method is characterized in that an AC-resistor electric heating device is replaced by a DC-resistor electric heating device; a self-baking electrode of the DC-resistor electric heating device is replaced by a graphitized electrode or carbon electrode, and waste heat, steam and condensate produced in the DC-resistor electric heating device are recovered and recycled. Energy saving, emission reduction and yield increasing are effectively achieved by replacing the AC-resistor electric heating device with the DC-resistor electric heating device; the application of the graphitized electrode or carbon electrode decreases consumption, increases electrode conductivity and eliminates environmental pollution from self-baking electrode asphalt fume. Resource saving, environment protection, emission reduction and yield increasing are achieved by recycling the waste heat and energy sources. The method is important to the development of modern industry.
Description
Technical field
The present invention relates to improving one's methods of resistance electric heating equipment, particularly relate to that a kind of DC-resistance electric heating equipment is energy-conservation, reduction of discharging and method for increasing.
Background technology
At present, Chinese DC-electricity forge furnace has replaced Japanese AC-electricity forge furnace, but other kind AC-resistance heating device is still occupied an leading position in some industry both at home and abroad, waste resource.
Guizhou Aluminum Factory in 1979 is introduced single-phase 1200KVA-AC-electricity forge furnace from Japanese Graphite Electrode Co., Ltd. and is produced electric forging coal [ECA], develop afterwards production domesticization 1350KVA-AC-electricity forge furnace, both are 1250KWh/t-ECA by power consumption, and self-baking electrode consumption is high, conductance is low and glance coal contaminated environment is serious.
China's AC-mineral hot furnace (ferro-alloy furnace, industrial silicon furnace, furnace of calcium carbide and Yellow phosphorus furnace etc.) is occupied an leading position, 2000 ~ 6300KVA-DC-mineral hot furnace prove compared with respective volume AC-mineral hot furnace have that power consumption is lower, electrode paste consumption is lower, alloy content improves and equipment reducing noise.
Present electric forge furnace, for the discharge arbitrarily such as fume afterheat, furnace side portion waste heat, product sensible heat, is wasted resource, and raw material does not have preheating and gathers dust, and flue gas does not purify sulfur dioxide [SO2], and environment is caused to severe contamination.
Summary of the invention
Main purpose of the present invention is to provide that a kind of D.C. resistance electric heating equipment is energy-conservation, reduction of discharging and method for increasing, application DC-resistance electric heating equipment replace AC-resistance electric heating equipment energy-conservation, reduce discharging, volume increase, adopt graphitized electrode to reduce and consume, improve electrode conductivuty and eliminate self-baking electrode glance coal contaminated environment.Utilize the recycle and reuse of waste heat and the energy to reach saving, environmental protection, reduction of discharging and the object of increasing production of resource.
In order to achieve the above object, the technical scheme that the present invention proposes is:
A kind of DC-resistance electric heating equipment is energy-conservation, reduce discharging and the method for volume increase, comprise with DC-resistance electric heating equipment replacement AC-resistance electric heating equipment, it is characterized in that, adopt graphitized electrode or carbon resistance rod to replace self-baking electrode and reclaim the waste heat, steam and the condensed water that in DC-resistance electric heating equipment, produce electroded DC-resistance electric heating equipment and recycled.
Described DC-resistance heating device comprises DC-industrial resistance furnace, electroded DC-resistance furnace and DC-resistance heater.
Described waste heat comprises the fume afterheat of DC-resistance electric heating equipment, furnace sidewall radiant heat, the low temperature exhaust heat of waste heat boiler and the product sensible heat of DC-resistance electric heating equipment of DC-resistance electric heating equipment.
Described steam comprises exhaust steam in steam turbine, waste heat boiler steam and waste heat boiler blowdown steam.
Described recycling comprises: product sensible heat circulating generation process, fume afterheat circulating generation process and raw material cyclic preheat process.
Described product sensible heat circulating generation process is:
[AC] forms [DC] after over commutation, [DC] makes the work of [DC] resistance electric heating equipment, after the product sensible heat obtaining is reclaimed by heat exchanger, introduce the first waste heat boiler, by sending [AC] after the waste heat boiler steam introducing steam turbine power generation unit of generation, complete cyclic process.
Described fume afterheat circulating generation process is:
[AC] forms [DC] after over commutation, and [DC] makes the work of [DC] resistance electric heating equipment, and the fume afterheat of generation and condensed water are introduced to the second waste heat boiler, by sending [AC] after the waste heat boiler steam introducing steam turbine power generation unit of generation, completes cyclic process.
Described raw material cyclic preheat process is:
[AC] forms [DC] after over commutation, [DC] makes the work of DC-resistance electric heating equipment, raw material is added after preheating to DC-resistance electric heating equipment, the furnace sidewall radiant heat of generation and the low temperature exhaust heat of waste heat boiler draw back in raw material raw material are carried out to the pre-heat treatment, complete cyclic process.
Also comprise sulfur dioxide in dedusting to raw material and flue gas and purifying smoke.
Also be included in described DC-resistance electric heating equipment outer wall and add the heat-insulation layer that insulation material is made.
The present invention has following beneficial effect and advantage:
1. the present invention carries out preheating and dedusting to raw material, working environment is improved and reduce the consumption of raw material;
2. the present invention's application DC-resistance electric heating equipment replaces AC-resistance electric heating equipment, saves the energy, reduces flue dust, increases output;
3. the present invention utilizes graphitized electrode or carbon resistance rod to replace self-baking electrode to reduce environmental pollution, energy-saving and production-increase;
4. the present invention utilizes the method that heat resource recycles to reduce the gas dischargings such as flue dust, sulfur dioxide, saves the energy.
Accompanying drawing explanation
Fig. 1 is DC-electricity forge furnace process chart;
Fig. 2 is DC-mineral hot furnace process chart;
Fig. 3 is DC-casting resistance furnace process chart.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Embodiment 1
Be illustrated in figure 1 novel DC electricity forge furnace process chart, alternating current AC becomes direct current DC through transformer and switching process, after raw material preheating, dedusting, produce electric forging coal on the one hand by DC electricity forge furnace or electricity is forged Jiao, electric forging coal or the electric sensible heat of forging burnt generation are recovered to waste heat boiler by heat exchanger, after entering pressure matcher, the steam producing make Turbo-generator Set send alternating current AC, become direct current DC by transformer and switching process again, reach the object recycling; On the other hand the flue gas and the coal gas that produce by DC electricity forge furnace are lighted, waste heat recovery produces equally steam in waste heat boiler, repeatedly go up the process of a circulation, the condensed water that wherein Turbo-generator Set produces is also recovered to waste heat boiler, and exhaust steam in steam turbine and water that the blowdown steam that waste heat boiler produces and Turbo-generator Set produce are mixed to form hot water; Utilize on the other hand after the de-SO2 of low temperature exhaust heat that radiant heat that DC electricity forge furnace produces and waste heat boiler produce to raw material preheating, and by raw material being added to after the process of gathering dust to DC electricity forge furnace.
Novel DC-electricity forge furnace comprises single-phase DC-electricity forge furnace or three-phase DC-electricity forge furnace.Adopting DC-electricity forge furnace to replace AC-electricity, forge furnace is energy-conservation economizes on electricity 40%; Graphitized electrode replaces self-baking electrode, realizes economize on electricity, reduces graphitized electrode and consume effect, eliminate the glance coal that self-baking electrode roasting produces and pollute, saving resource, prevent from polluting, also comprise that strengthening DC-electricity forge furnace sidepiece heat preservation energy-saving economizes on electricity.
Utilize fume afterheat generating to return to again DC-electricity forge furnace economize on electricity 48.75 ~ 52.50%; Electricity forge furnace furnace roof chimney is discharged the coal gas of fume afterheat and calcined anthracite discharge and is lighted at present discharge, waste resource.
Novel DC-electricity forge furnace, lighting in fume afterheat and coal gas introducing burner, be measured the parameter of this mist as flow, temperature, composition, density etc., calculates the heat of mist as selecting the basis of waste heat boiler capacity and the basis of gas cleaning.
Fume afterheat and gas-fired heat are introduced waste heat boiler, are converted to steam at this heat energy.Steam enters gas-turbine generating set and sends out AC, after being rectified into DC, economizes on electricity for DC-electricity forge furnace.Reclaim the condensate water of steam turbine for the water saving of waste heat boiler water.Flash steam and the waste heat boiler blowdown steam of recycling turbine machine are energy-conservation.The low temperature exhaust heat of waste heat boiler is energy-conservation or volume increase with recovery DC-electricity forge furnace sidepiece radiant heat preheating material.Recycle the product sensible heat power generating of novel DC-electricity forge furnace and reduce investment outlay for a unit with the generating of novel DC-electricity forge furnace fume afterheat.
At present DC-electricity forge furnace product as electric calcined anthracite or electricity forge petroleum coke sensible heat be cooled completely water take away 68.0% and DC-electricity forge furnace product take away 8.9%.The technical scheme that reclaims DC-electricity forge furnace sensible heat is to change wind-water associating cooling scheme into by former water cooling.Hot blast is produced steam or generating.
Novel DC-electricity forge furnace arranges SO2 device in purifying smoke and reduces discharging.Raw material saving resource and protection of the environment are returned in the dedusting of novel DC-electricity forge furnace material loading (anthracite or petroleum coke) again.
Embodiment 2
Be illustrated in figure 2 novel DC mineral hot furnace process chart, alternating current AC becomes direct current DC through transformer and switching process, after raw material preheating and dedusting, produce on the one hand fused product by DC mineral hot furnace, the sensible heat that fused product is produced is recovered to waste heat boiler by heat exchanger, after entering pressure matcher, the steam producing make Turbo-generator Set send alternating current AC, become direct current DC by transformer and switching process again, reach the object recycling; On the other hand the flue gas and the CO that produce by DC electricity forge furnace are lighted, waste heat recovery produces equally steam in waste heat boiler, repeatedly go up the process of a circulation, the condensed water that wherein Turbo-generator Set produces is also recovered to waste heat boiler, and exhaust steam in steam turbine and water that the blowdown steam that waste heat boiler produces and Turbo-generator Set produce are mixed to form hot water; Utilize on the other hand after the de-SO2 of low temperature exhaust heat that radiant heat that DC-electricity forge furnace produces and waste heat boiler produce to raw material preheating, and by raw material being added to after the process of gathering dust to DC electricity forge furnace.
Novel DC-mineral hot furnace energy-conservation 35 ~ 50%.AC-mineral hot furnace is transformed into large capacity DC-resistance mineral hot furnace energy-conservation; DC-resistance mineral hot furnace adopts graphitized electrode or carbon resistance rod to replace the affiliated self-baking electrode of electrode paste, reaches effect energy-conservation, that reduce discharging and increase production.
Sidepiece heat radiation or other waste heat preheating for novel DC-mineral hot furnace raw material, reduce novel DC-mineral hot furnace power consumption.Raw material dedusting main purpose: the one, improve working conditions; The 2nd, cut down the consumption of raw materials.The cogeneration of novel DC-mineral heating furnace flue and the cogeneration of product sensible heat are with reducing investment outlay with a steam turbine power generation unit and being convenient to management.
Novel DC-mineral hot furnace product melt sensible heat reclaims can divide following two parts: melt radiation high-temperature waste heat heat exchanger is regained generating; The melting calcium carbide that furnace of calcium carbide generates under 1800 ~ 2000 ℃ of high temperature is put into calcium carbide pot, reclaims melting calcium carbide radiant heat generate electricity with heat exchanger; Reclaim and solidify calcium carbide radiant heat production steam or generating with heat exchanger.Recycle exhaust steam in steam turbine and condensed water, exhaust-heat boiler flue gas afterheat energy-saving and saving resource, in purifying smoke, SO2 reduces discharging.
Embodiment 3
Be illustrated in figure 3 novel DC casting resistance furnace process chart, alternating current AC becomes direct current DC through transformer and switching process, after raw material preheating dedusting, cast resistance furnace by DC, produce casting melt, heat radiation in this process is become the heat radiation producing in steel-casting process introduce in raw material with melt casting and carry out preheating, reach and recycle object.
DC-casting resistance furnace replaces AC-casting resistance furnace energy-conservation 20 ~ 30%; DC-casting resistance furnace fume afterheat is produced steam or generating; DC-casting resistance furnace sidepiece radiation waste heat and waste heat boiler low-temperature flue gas preheating preheating material are energy-conservation; Reclaim product sensible heat and reclaim DC-casting resistance furnace fume afterheat and produce steam and generate electricity by same Turbo-generator Set; Waste heat is produced in steam and power generation process, reaches object energy-conservation and volume increase; Recycle gas-turbine exhaust steam and waste heat boiler blowdown steam energy-conservation; Recycle waste heat boiler low-temperature flue gas waste heat energy-conservation; Recycling gas-turbine condensate water economizes on water for waste heat boiler; Propose to keep gas-turbine generating set power generation stabilization method.
Novel DC-electricity forge furnace is energy-conservation, reduce discharging and the method for volume increase as follows: recycle novel DC-electricity forge furnace fume afterheat; Making DC-electricity forge furnace power consumption reduce 109KWh/t-ECA with novel DC-electricity forge furnace sidepiece waste heat or waste heat boiler waste heat preheating material is that DC-electricity forge furnace power consumption reduces by 14.0%, and waste heat preheating material is favourable raising production capacity also, but is not the relation of direct ratio; Novel DC-electricity forge furnace product sensible heat heat expenditure reaches 72% and exceedes DC-electricity forge furnace fume afterheat heat expenditure 20.9%, and sensible heat power generating has a high potential, and proposes to reclaim the method for DC-electricity forge furnace product sensible heat heat, and sensible heat power generating and fume afterheat generating are used same generator; Recycle gas-turbine exhaust steam and waste heat boiler blowdown steam energy-conservation; Recycling gas-turbine condensate water economizes on water for waste heat boiler; Propose to keep two kinds of methods of gas-turbine generating set power generation stabilization; Raw material dedusting is returned to raw material use again and is economized on resources; In purifying smoke, SO2 reduces discharging.
DC-resistance heating device further energy-conservation, reduce discharging or the method for volume increase as follows: carbon electrode as the resistance electric heating equipment of heating adopt graphitized electrode or carbon resistance rod replace self-baking electrode under electrode paste energy-conservation, reduce discharging or volume increase; Recycle DC-resistance electric heating equipment fume afterheat and produce steam and generating etc.; Recycle DC-resistance electric heating equipment sidepiece radiation waste heat or exhaust-heat boiler flue gas waste heat preheating material to reduce power consumption or to improve product production capacity, DC-electricity forge furnace and DC-mineral hot furnace all can be increased production; Adopt wind or wind-water combined techniques to recycle DC-resistance electric heating equipment product sensible heat and produce steam or generating, and sensible heat power generating and the available same generator of fume afterheat generating; Raw material and flue gas ash removal, purifying smoke pernicious gas saving resource and environmental protection reach " industrial furnace atmosphere pollutants emission standards " and improve economic and social benefit, the insulation of strengthening DC-resistance electric heating equipment.
The DC-resistance electric heating equipment with electrode comprises electric forge furnace and mineral hot furnace.
Comprise that in addition the energy-conservation DC-of the being industrial resistance furnace of middle low power resistance furnace replaces AC-industrial resistance furnace and the energy-conservation DC-of the being resistance heater of resistance heater to replace AC-resistance heater.
[AC] represents alternating current, and [DC] represents direct current.
Claims (10)
- A DC-resistance electric heating equipment energy-conservation, reduce discharging and the method for volume increase, comprise with DC-resistance electric heating equipment replacement AC-resistance electric heating equipment, it is characterized in that, adopt graphitized electrode or carbon resistance rod to replace self-baking electrode and reclaim the waste heat, steam and the condensed water that in DC-resistance electric heating equipment, produce electroded DC-resistance electric heating equipment and recycled.
- 2. described in, DC-resistance heating device comprises DC-industrial resistance furnace, electroded DC-resistance furnace and DC-resistance heater.
- 3. press the method that DC-resistance electric heating equipment claimed in claim 1 is energy-conservation, reduce discharging and increase production, it is characterized in that, described waste heat comprises the fume afterheat of DC-resistance electric heating equipment, furnace sidewall radiant heat, the low temperature exhaust heat of waste heat boiler and the product sensible heat of DC-resistance electric heating equipment of DC-resistance electric heating equipment.
- 4. press the method that DC-resistance electric heating equipment claimed in claim 1 is energy-conservation, reduce discharging and increase production, it is characterized in that, described steam comprises exhaust steam in steam turbine, waste heat boiler steam and waste heat boiler blowdown steam.
- Energy-conservation by DC-resistance electric heating equipment claimed in claim 1, reduce discharging and the method for volume increase, it is characterized in that, described in recycle and comprise: product sensible heat circulating generation process, fume afterheat circulating generation process and raw material cyclic preheat process.
- 6. press the method that DC-resistance electric heating equipment claimed in claim 5 is energy-conservation, reduce discharging and increase production, it is characterized in that, described product sensible heat circulating generation process is:[AC] forms [DC] after over commutation, [DC] makes the work of [DC] resistance electric heating equipment, after the product sensible heat obtaining is reclaimed by heat exchanger, introduce the first waste heat boiler, by sending [AC] after the waste heat boiler steam introducing steam turbine power generation unit of generation, complete cyclic process.
- 7. press the method that DC-resistance electric heating equipment claimed in claim 5 is energy-conservation, reduce discharging and increase production, it is characterized in that, described fume afterheat circulating generation process is:[AC] forms [DC] after over commutation, and [DC] makes the work of [DC] resistance electric heating equipment, and the fume afterheat of generation and condensed water are introduced to the second waste heat boiler, by sending [AC] after the waste heat boiler steam introducing steam turbine power generation unit of generation, completes cyclic process.
- 8. press the method that DC-resistance electric heating equipment claimed in claim 5 is energy-conservation, reduce discharging and increase production, it is characterized in that, described raw material cyclic preheat process is:[AC] forms [DC] after over commutation, [DC] makes the work of DC-resistance electric heating equipment, raw material is added after preheating to DC-resistance electric heating equipment, the furnace sidewall radiant heat of generation and the low temperature exhaust heat of waste heat boiler draw back in raw material raw material are carried out to the pre-heat treatment, complete cyclic process.
- Energy-conservation by DC-resistance electric heating equipment claimed in claim 1, reduce discharging and the method for volume increase, it is characterized in that, also comprise sulfur dioxide in dedusting to raw material and flue gas and purifying smoke.
- 10. press the method that DC-resistance electric heating equipment claimed in claim 1 is energy-conservation, reduce discharging and increase production, it is characterized in that, be also included in described DC-resistance electric heating equipment outer wall and add the heat-insulation layer that insulation material is made.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104930864A (en) * | 2015-06-03 | 2015-09-23 | 佟玉鹏 | Method for recycling secondary energy of direct-current submerged arc furnace |
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| CN102778134A (en) * | 2012-06-21 | 2012-11-14 | 遵义市贵科科技有限公司 | New process for utilizing waste heat of flue gas of semi-enclosed ore-smelting electric furnace |
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- 2012-11-16 CN CN201210468877.4A patent/CN103822495A/en active Pending
Patent Citations (7)
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| US4099019A (en) * | 1976-08-24 | 1978-07-04 | Joetsu Denro Kogyo Co., Ltd. | Electric furnace waste heat recovery method and apparatus |
| JPS58104311A (en) * | 1981-12-16 | 1983-06-21 | Sumitomo Metal Ind Ltd | Waste heat recovering method |
| CN2402987Y (en) * | 2000-01-18 | 2000-10-25 | 路忠胜 | Electric single-phase DC forge furnace |
| CN201772763U (en) * | 2010-09-01 | 2011-03-23 | 昆明圣奥科技发展有限公司 | High-temperature slag waste heat reclaiming system |
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| CN102620571A (en) * | 2012-04-10 | 2012-08-01 | 上海瑞恩能源投资有限公司 | Waste-heat power generating system in smelting process of rotary kiln and ore-smelting electric furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104930864A (en) * | 2015-06-03 | 2015-09-23 | 佟玉鹏 | Method for recycling secondary energy of direct-current submerged arc furnace |
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Application publication date: 20140528 |