CN101726175A - Heat accumulating type external heat blast cupola furnace - Google Patents

Heat accumulating type external heat blast cupola furnace Download PDF

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Publication number
CN101726175A
CN101726175A CN200910254029A CN200910254029A CN101726175A CN 101726175 A CN101726175 A CN 101726175A CN 200910254029 A CN200910254029 A CN 200910254029A CN 200910254029 A CN200910254029 A CN 200910254029A CN 101726175 A CN101726175 A CN 101726175A
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combustion
heat
furnace
air
supporting
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CN200910254029A
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Chinese (zh)
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赵文鹤
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赵文鹤
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Priority to CN200910254029A priority Critical patent/CN101726175A/en
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Abstract

The invention discloses a heat accumulating type external heat blast cupola furnace. The lower part of a furnace body is provided with a main air bellow; the middle part of the furnace body is provided with a primary combustion-supporting air bellow; the upper part of the primary combustion-supporting air bellow is provided with a furnace gas leading-out pipe; the furnace gas leading-out pipe is provided with a thermocouple and a secondary combustion-supporting air bellow; the other end of the furnace gas leading-out pipe is connected with a cyclone dust extractor; an air outlet of the cyclone dust extractor is connected with two heat accumulated type heat exchangers through smoke outlet pipes; the other ends of the heat exchangers are connected with a blast blower and a draught fan through pipelines provided with reversal valves; high-temperature hot blast output by the heat accumulated type heat exchangers is sent into the main air bellow, the primary combustion-supporting air bellow and the secondary combustion-supporting air bellow; an inlet smoke pipe of the draught fan is provided with a thermocouple; and an outlet of the draught fan is connected with a secondary dust collector. The heat accumulating type external heat blast cupola furnace does not use a combustion-supporting fuel to ignite furnace gas, the temperature of the hot blast reaches 600 to 900 DEG C, and the heat efficiency is over 60 percent which is far higher than that (25 to 35 percent) of the cupola furnace in general use at present.

Description

Heat accumulating type external heat blast cupola furnace
Technical field
The present invention relates to the Foundry Production field, be a kind of be the furnace cupola that fuel is used to melt molten iron with the coke.
Background technology
Present known furnace cupola has cold blast cupola and blast-heating cupola.Blast-heating cupola comprises two kinds in internal heat type furnace cupola and external-heat furnace cupola, wherein the hot blast of internal heat type furnace cupola is to be produced by the close muscle hot blast courage that is contained in fusion zone top, the flue hot blast just utilizes the physics heat of furnace gas, and the chemical heat in the furnace gas can't be utilized, and hot blast temperature is generally less than 250 ℃.The external-heat furnace cupola is that furnace gas is guided to outside the stove, by combustion-supporting fuel furnace gas is lighted in the combustion chamber outside stove, by multi-form heat exchanger cold wind is become hot blast again; The external-heat furnace cupola can utilize the physics heat and the chemical heat of furnace gas simultaneously, and 350-500 ℃ hot blast can be provided.The preheating air-supply is a kind of effective measures of reinforcement cupola melting, and wind-warm syndrome surpasses 350 ℃, to improving molten iron temperature, improves molten steel quality, and reducing coke consumption and raising melting rate etc. all has remarkable result.The thermal efficiency of furnace cupola improves with the raising of wind-warm syndrome, and the thermal efficiency of cold blast cupola is generally 25-30%, and when 600 ℃ of wind-warm syndrome, the thermal efficiency can bring up to 60%, is 2 times of cool wind stove.Done comparatively detailed argumentation about external-heat furnace cupola " modern cast iron " the 4th phase of nineteen ninety-five " brief introduction of domestic " external-heat " blast-heating cupola applicable cases ".
The Chinese patent patent No. is that 99107775.x " external hot air furnace cupola and clarifying smoke technological equipment " has introduced a kind of furnace cupola, its technological process is to extract the outer thorough dedusting of furnace gas of stove earlier out, feed the combustion chamber internal combustion of making combustion-supporting fuel of coal again, obtain hot blast by dividing wall type heat exchanger.Its shortcoming is: lost the physics heat of furnace gas, needed to make combustion-supporting fuel with coal, the heat exchange efficiency of heat exchanger is lower.
The Chinese patent patent No. is that 200520008373.x " external heat blast lining-less water jacket cupola " has introduced another kind of furnace cupola, its technological process is directly to send into combustion-type after furnace gas is extracted body of heater out, having under the combustion-supporting situation of natural gas, send into secondary wind and make the furnace gas burning, can make hot blast temperature reach 400-600 ℃ by pipe heat exchanger.Its shortcoming is: need to make combustion-supporting fuel with natural gas, adaptability is relatively poor when furnace gas temperature fluctuates, and the thermal efficiency of heat exchanger is not high yet.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of the assurance under the situation that the useful height of a cupola does not reduce, need not combustion-supporting fuel, make furnace gas smooth combustion, no matter how furnace gas temperature changes, the flue-gas temperature that enters secondary ash collector is not higher than setting value, hot blast temperature can reach 600-900 ℃, and the thermal efficiency is applicable to the external heat blast cupola furnace of various tonnages greater than 60%.
For solving the problems of the technologies described above, the present invention has adopted a kind of like this heat accumulating type external heat blast cupola furnace, its feature comprises: be provided with the main air case in the bottom of cupola body, the main air case connect can be in stove the main air eye of air feed, be provided with once combustion-supporting bellows at the middle part of body of heater, once combustion-supporting bellows connect the once combustion-supporting eye of wind that can blow in stove, on the top side wall of furnace of combustion-supporting bellows once, be provided with the furnace gas fairlead, nearly body of heater one side is provided with thermocouple and the combustion-supporting bellows of secondary on the furnace gas fairlead, the combustion-supporting bellows of secondary pass through the combustion-supporting eye of wind of secondary to furnace gas fairlead air feed, the other end of furnace gas fairlead connects the cyclone dust collectors air intake vent, the heat regenerator of dress ceramic heat storage body in the air outlet of cyclone dust collectors connects two by pipe, the other end of two heat regenerators connects air blast and air-introduced machine by the pipeline that reversal valve is housed, two heat regenerators are by being contained in the continuous conversion of 4 three-way diverter valves on the pipeline, finish the process of accumulation of heat and hot blast, the valve that the high-temperature hot-air of sending from heat regenerator passes through the high temperature airduct and links to each other with the high temperature airduct, connect the main air case respectively, once combustion-supporting bellows and the combustion-supporting bellows of secondary, on the inlet smoke pipe of air-introduced machine, thermocouple is housed, the outlet of air-introduced machine connects secondary filter, the flue gas of discharging from secondary filter enters atmosphere by smoke exhaust pipe, the movable bell of just opening when also being equipped with only at material loading in the top of body of heater.
The position of the last combustion-supporting eye of wind of body of heater is selected in the interior furnace gas temperature of stove greater than in 650 ℃ the corresponding height, can guarantee to light smoothly under the situation of sending into an an amount of combustion air part furnace gas like this; The position of furnace gas fairlead is determined by the effective depth of furnace cupola; The size of a combustion air valve opening, by the thermocouple interlock control that is contained on the furnace gas fairlead, set thermocouple readings greater than 650 ℃, could guarantee furnace gas smooth combustion when sending into an amount of secondary combustion air like this, the size of secondary combustion air is with the CO in the after-flame furnace gas, and more than needed being as the criterion arranged slightly.The CO that does not have after-flame in the furnace gas fairlead can burn away in cyclone dust collectors, has so just cancelled the combustion-supporting fuel that is used to light a fire with auxiliary combustion.
Carry the pipeline of high-temperature flue gas and high-temperature hot-air all to be lined with refractory insulating layer, cyclone dust collectors and heat regenerator also are lined with the suitable thickness refractory insulating layer, the ceramic heat storage body that is equipped with in this heat exchanger inside, its refractoriness reaches 1700 ℃, can guarantee under 1300 ℃ temperature, stably to work, thereby make hot blast temperature reach 600-900 ℃, the height of hot blast temperature depends on burnt consumption.
The action of 4 three-way diverter valves on the heat regenerator is contained in the control of the thermocouple setting value on the low temperature smoke exhaust pipe of air-introduced machine inlet, and when temperature was higher than a certain setting value, 4 three-way diverter valves moved simultaneously, finish the conversion of accumulation of heat and hot blast state.The variation that the furnace cupola furnace gas temperature takes place only influences action cycle of three-way diverter valve, to the not influence of flue-gas temperature of discharging from heat regenerator, thereby the flue-gas temperature that enters secondary filter is remained in the setting value.
Beneficial effect
The present invention has successfully solved under the situation that guarantees the useful height of a cupola, need not make furnace gas smooth combustion by combustion-supporting fuel; The reasonably design of heat regenerator, can be under the situation that 600-900 ℃ of hot blast is provided long-time steady operation, apparently higher than hot blast temperature 400-600 ℃ of the outer hot furnace cupola that generally uses at present; The heat that coke produces is except that some inevitable heat wastes, and all the other all are used for the fusing of molten iron and overheated, and the thermal efficiency of furnace cupola is brought up to more than 60%, are higher than the thermal efficiency 25-35% of the furnace cupola that generally uses at present far away.2,510 ten thousand tons of China's ironcasting annual productions in 2008, use cupola melting as 70%, calculate by present furnace cupola evenly heat efficient 30%, need 284.3 ten thousand tons in coke (fixed carbon 80%) altogether, the CO2 discharge capacity is 8,350,000 tons, as adopt the present invention can save 1,420,000 tons in coke at least, reduce CO2 and discharge 4,170,000 tons.
Description of drawings
Be described in further detail below in conjunction with accompanying drawing and embodiments of the present invention;
Accompanying drawing is a structural representation of the present invention.
The specific embodiment
By heat accumulating type external heat blast cupola furnace structural representation shown in the drawings as can be known, have tapping hole 1 on the body of heater 4 with the inner lining refractory of welded steel plate, the bottom of body of heater 4 is equipped with main air eye 2, the middle part is provided with once combustion-supporting bellows 6, top is provided with furnace gas fairlead 7, be provided with the bell 31 of movable unlatching topmost, main air case 3 and main air eye 2 are communicated with, the once combustion-supporting eye of wind 5 and once combustion-supporting bellows 6 are communicated with, furnace gas fairlead 7 is provided with thermocouple 8 and the combustion-supporting bellows 9 of secondary, the combustion-supporting eye of wind 10 of secondary is communicated with combustion-supporting bellows 9 of secondary and furnace gas fairlead 7, the other end of furnace gas fairlead 7 connects the air intake vent of the cyclone dust collectors 15 of liner refractory insulating layer, the air outlet of cyclone dust collectors 15 connects heat regenerator 19 and heat regenerator 20 respectively by high temperature smoke exhaust pipe 16, the other end of two heat exchangers connects blast pipe 26 and low temperature smoke exhaust pipe 24 respectively, the other end of blast pipe 26 connects air blast 27, the other end of low temperature smoke exhaust pipe 24 connects air-introduced machine 28, the air outlet of air-introduced machine 28 connects the inlet of secondary filter 29, flue gas after being purified enters atmosphere by smoke exhaust pipe 30.Temperature end at heat regenerator 19 and heat regenerator 20 also is connected with high temperature airduct 14, and the other end of high temperature airduct 14 connects main air case 3, once combustion-supporting bellows 6 and the combustion-supporting bellows 9 of secondary by pipeline respectively; 13, the 12, the 11st, volume damper, the 23,22,17, the 18th, three-way diverter valve, thermocouple 25 is installed on the low temperature smoke exhaust pipe 24.
In order further to understand the present invention, the course of work to heat accumulating type external heat blast cupola furnace is described below: the blow-on initial stage criticizes by 1: 5 batching of coke-iron-rate 5-8 earlier, open main air case valve 13, at this moment valve 12 and 11 is in closed condition, three-way diverter valve 17,18,22,23 are in position shown in the accompanying drawing, start air-introduced machine 28 and air blast 27, at this moment can see that thermocouple 8 indicated numerical value constantly rise, when Temperature numerical reaches 300 ℃, suitable Open valve 12, at this moment the numerical value that can see thermocouple 8 rises rapidly, Open valve 11 when temperature arrives 650 ℃, furnace gas enters the smooth combustion state, at this moment heat regenerator 19 is in the accumulation of heat state, heat regenerator 20 is still exported cold wind, when the temperature of the thermocouple 25 on being contained in low temperature smoke exhaust pipe 24 arrives setting value (as 150 ℃), three-way diverter valve 17,18,22 and 23 actions simultaneously, transform to the another location, at this moment heat regenerator 20 becomes the accumulation of heat state, heat regenerator 19 output hot blasts, furnace cupola enters the hot blast molten state, adjusts coke-iron-rate and makes the commutation cycle of three-way diverter valve in setting value (as 5-8 minute), just enter normal molten state.
Adopt above-mentioned heat accumulating type external heat blast cupola furnace, guaranteeing to have cancelled the combustion-supporting fuel that is used to light a fire with auxiliary combustion under the situation that the useful height of a cupola does not reduce, make furnace gas smooth combustion on the one hand; Reduced the physics heat of discharging furnace gas on the other hand, the thermal efficiency that makes furnace cupola is greater than 60%.

Claims (4)

1. heat accumulating type external heat blast cupola furnace, the middle part that is included in body of heater is provided with once combustion-supporting bellows, once combustion-supporting bellows connect the once combustion-supporting eye of wind that can blow in stove, at the top stove of combustion-supporting bellows once, the sidewall of body is provided with the furnace gas fairlead, the furnace gas fairlead is provided with thermocouple and the combustion-supporting bellows of secondary, the combustion-supporting eye of wind of secondary is located in the combustion-supporting bellows of secondary, the other end of furnace gas fairlead connects the air intake vent of cyclone dust collectors, the air outlet of cyclone dust collectors connects two heat regenerators by pipe, the other end of heat regenerator divides by the pipeline that reversal valve is housed and connects air blast and air-introduced machine, import the main air case from the high-temperature hot-air that heat regenerator is sent respectively by the high temperature airduct, once combustion-supporting bellows and the combustion-supporting bellows of secondary, on the inlet smoke pipe of air-introduced machine thermocouple is housed, the outlet of air-introduced machine connects secondary filter.
2. according to the described furnace cupola of claim 1, it is characterized in that: the position of the last combustion-supporting eye of wind of body of heater is selected in the interior furnace gas temperature of stove greater than in 650 ℃ the corresponding height.
3. according to the described furnace cupola of claim 1, it is characterized in that: the size of a combustion air valve opening, by the setting value control that is contained in the thermocouple on the furnace gas fairlead.
4. according to the described furnace cupola of claim 1, it is characterized in that: the action of 4 three-way diverter valves on the heat regenerator pipeline is contained in the control that the thermocouple on the air-introduced machine inlet low temperature smoke exhaust pipe sets value.
CN200910254029A 2009-12-08 2009-12-08 Heat accumulating type external heat blast cupola furnace Pending CN101726175A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101893239A (en) * 2010-08-10 2010-11-24 宁夏华源冶金实业有限公司 Premixing low-pressure injection heat storage type nozzle
CN103145328A (en) * 2013-03-13 2013-06-12 青岛青力环保设备有限公司 Method for comprehensively utilizing basalt blast furnace slag in preparation of rock wool board
CN103307889A (en) * 2012-03-14 2013-09-18 段金挺 Gradient utilization method for waste heat of cupola furnace
CN104456540A (en) * 2014-12-04 2015-03-25 安徽诚铭热能技术有限公司 Loop cold and hot air waste heat recovery and utilization ignition furnace
CN107314665A (en) * 2016-07-29 2017-11-03 南京柳泉新能源科技有限公司 A kind of gas-fired cupola typed high temperature air burning device and method
CN107314666A (en) * 2016-07-29 2017-11-03 南京柳泉新能源科技有限公司 A kind of economical gas furnace cupola running gear and method

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101893239A (en) * 2010-08-10 2010-11-24 宁夏华源冶金实业有限公司 Premixing low-pressure injection heat storage type nozzle
CN103307889A (en) * 2012-03-14 2013-09-18 段金挺 Gradient utilization method for waste heat of cupola furnace
CN103307889B (en) * 2012-03-14 2015-01-14 段金挺 Gradient utilization method for waste heat of cupola furnace
CN103145328A (en) * 2013-03-13 2013-06-12 青岛青力环保设备有限公司 Method for comprehensively utilizing basalt blast furnace slag in preparation of rock wool board
CN103145328B (en) * 2013-03-13 2016-03-16 青岛青力环保设备有限公司 A kind of method of basalt blast furnace slag in preparation of rock wool board comprehensive utilization
CN104456540A (en) * 2014-12-04 2015-03-25 安徽诚铭热能技术有限公司 Loop cold and hot air waste heat recovery and utilization ignition furnace
CN107314665A (en) * 2016-07-29 2017-11-03 南京柳泉新能源科技有限公司 A kind of gas-fired cupola typed high temperature air burning device and method
CN107314666A (en) * 2016-07-29 2017-11-03 南京柳泉新能源科技有限公司 A kind of economical gas furnace cupola running gear and method
CN107314666B (en) * 2016-07-29 2019-02-22 南京柳泉新能源科技有限公司 A kind of economical gas furnace cupola running gear and method
CN107314665B (en) * 2016-07-29 2019-02-22 南京柳泉新能源科技有限公司 A kind of gas-fired cupola typed high temperature air burning device and method

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