CN105000811A - Parallel flow heat accumulating type lime kiln production technology based on CO2 accumulation - Google Patents

Parallel flow heat accumulating type lime kiln production technology based on CO2 accumulation Download PDF

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CN105000811A
CN105000811A CN201510444135.1A CN201510444135A CN105000811A CN 105000811 A CN105000811 A CN 105000811A CN 201510444135 A CN201510444135 A CN 201510444135A CN 105000811 A CN105000811 A CN 105000811A
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gas
kiln
accumulating type
heat accumulating
combustion
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CN105000811B (en
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李宝宽
荣文杰
王强
李林敏
孙美佳
童岩鹏
李一明
齐凤升
王芳
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Northeastern University China
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Northeastern University China
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    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills

Abstract

The invention discloses a parallel flow heat accumulating type lime kiln production technology based on CO2 accumulation. The parallel flow heat accumulating type lime kiln production technology includes the steps that limestone raw materials are fed into two kiln chambers of a parallel flow heat accumulating type lime kiln; carrier gas is sprayed into the kiln chambers; combustion supporting gas is fed; in a combustion zone of the current kiln chamber, limestone absorbs the heat generated by fuel combustion to be decomposed to generate quick lime and CO2 gas; the quick lime is discharged after being cooled to 80 DEG C to 100 DEG C; cooling gas, the CO2 gas generated by decomposing the limestone and CO2 gas generated by fuel combustion are mixed to enter the other kiln chamber to preheat limestone; flue gas generated by preheating releases heat to the limestone, then the temperature of the flue gas is reduced, the flue gas is exhausted, and CO2 gas with the volume concentration larger than 95% is generated; the parallel flow heat accumulating type lime kiln starts reversing work. By means of the parallel flow heat accumulating type lime kiln production technology, the high-purity CO2 gas is obtained while the high-quality lime is prepared. Compared with an existing technology, circulation of N2 in a system is avoided, the energy used for heating the N2 is saved, and the flue gas is recycled to achieve the aims of increasing the product added value, saving energy and reducing consumption.

Description

A kind of based on CO 2enrichment and flow heat accumulating type limestone kiln producing and manufacturing technique
Technical field
The present invention relates to limestone kiln producing and manufacturing technique, particularly one is based on CO 2enrichment and flow heat accumulating type limestone kiln producing and manufacturing technique.
Background technology
In metallurgical industry, a large amount of CO can be produced when producing slag making materials unslaked lime 2.In actual production, produce the 1 ton of unslaked lime just CO of generation more than 1 ton 2, and melting 1 ton of steel about needs the unslaked lime of 70 kg.Within 2014, Chinese crude steel output is about 8.2 hundred million tons, then about need unslaked lime 5,700 ten thousand tons, produces the CO being greater than 6,000 ten thousand tons 2.Limestone kiln is used at present mostly to produce lime next life, but CO in the waste gas that ejects of limestone kiln 2content very low, if will by CO 2enrichment recycling, then also need cost a lot of money a part of energy and fund, so most enterprises is selected directly to discharge, this just causes a very serious environmental problem.
Domestic at present and flow heat accumulating type limestone kiln and produce and mostly use compressed air delivery coal dust, combustion-supporting and product cooling, CO in the flue gas of generation 2concentration low (volumetric concentration 10 ~ 14%) and exhaust gas volumn is large.Owing to being separated low CO after recovered flue gas 2the waste gas cost of content is higher, so flue gas is directly entered air by most enterprise, causes serious topsoil and the wasting of resources.
Summary of the invention
For existing processing method Problems existing, the invention provides a kind of based on CO 2enrichment and flow heat accumulating type limestone kiln producing and manufacturing technique.
Technical scheme of the present invention is:
A kind of based on CO 2enrichment and flow heat accumulating type limestone kiln producing and manufacturing technique, comprise the following steps:
(1) at first combustion period, raw limestone is delivered to scale hooper from building stones storehouse before kiln, raw limestone loads in truck and is transported to and flows heat accumulating type limekiln top after scale hooper weighs, and enters and flows in two kiln thoraxes in heat accumulating type limestone kiln;
(2) and the Fuel lance flowed in a kiln thorax in heat accumulating type limestone kiln is inserted in Wingdale stock column, carrier gas carries fuel and sprays in kiln thorax by Fuel lance;
(3) fed by also flowing heat accumulating type limekiln top by combustion-supporting gas by burner blower, under the draft of burner blower, combustion-supporting gas flows down to zone of combustion and fuel meets, and fuel is burnt below the spout of Fuel lance;
(4) at the zone of combustion of current kiln thorax, Wingdale absorbs the heat that fuel combustion produces, and decomposes and generates unslaked lime and CO 2gas;
(5) discharging after the cooling gas that the unslaked lime produced at the zone of combustion of current kiln thorax is fed by cooling blower carries out being cooled to 80 DEG C ~ 100 DEG C;
(6) cooling gas rises to connecting passage place after being heated by unslaked lime, the CO generated with decomposition of limestone 2the CO that gas and fuel combustion produce 2gas and vapor permeation enters another kiln thorax by connecting passage and rises, and enters preheating zone carry out preheating to Wingdale through zone of combustion;
(7) heat release reduces to temperature after Wingdale and discharges by pre-thermogenetic flue gas, by udst separation, produces the CO that volumetric concentration is greater than 95% 2gas, this CO 2the part of gas is as the carrier gas of transfer the fuel, and another part is as the cooling gas being fed cooling zone by cooling blower, and all the other directly store or make dry ice product;
(8) first burnout cycle complete, and flow various air-flow in heat accumulating type limestone kiln and stop flowing, and flow heat accumulating type limestone kiln and start commutation work, turnaround time 40 s ~ 50s, unslaked lime from and draw off bottom the kiln thorax flowing heat accumulating type limestone kiln.
Step (3) described combustion-supporting gas is the oxygen enrichment of oxygen concentration >95%.
The CO that volumetric concentration described in described step (7) is greater than 95% 2in gas 30% ~ 35% CO 2gas directly stores or makes dry ice product.
The CO that volumetric concentration described in described step (7) is greater than 95% 2in gas, 5% ~ 10% as the carrier gas of transfer the fuel.
The CO that volumetric concentration described in described step (7) is greater than 95% 2in gas, 55% ~ 65% as the cooling gas being fed zone of combustion by cooling blower.
Beneficial effect:
The invention provides based on CO 2enrichment and flow heat accumulating type limestone kiln producing and manufacturing technique, this have enrichment CO 2function and flow heat accumulating type limestone kiln producing and manufacturing technique also obtain highly purified CO while preparing high quality lime 2gas.Compared with existing processing method, eliminate N 2in intrasystem circulation, save for heating N 2energy, and flue gas recirculation utilized improve added value of product and the target such as energy-saving and cost-reducing to reach.
Accompanying drawing explanation
Fig. 1 be adopt in the embodiment of the present invention based on CO 2enrichment and flow heat accumulating type limestone kiln system architecture schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.
Embodiment 1
Based on CO in the present embodiment 2enrichment and flow heat accumulating type limestone kiln system architecture as shown in Figure 1, the cleaning apparatus of the employing in system is sack cleaner, and fuel is coal dust.From the dust concentration≤50mg/Nm of the flue gas that venting port is discharged 3.
Adopt above-mentioned and flow heat accumulating type limestone kiln system production unslaked lime (CaO), unslaked lime day output 450 tons, 80 production cycles of every day, per production cycle coal dust amount 240 kg ~ 270kg, combustion air coefficient of excess 1.1 ~ 1.4.
Based on CO 2enrichment and flow heat accumulating type limestone kiln producing and manufacturing technique, comprise the following steps:
(1) at first combustion period, raw limestone is delivered to scale hooper from building stones storehouse before kiln, raw limestone loads in truck and is transported to and flows heat accumulating type limekiln top after scale hooper weighs, and enters and flows in two kiln thoraxes (kiln thorax 1 and kiln thorax 2) in heat accumulating type limestone kiln;
Concrete material loading technique: Wingdale is by underground receiver bin, wide-angle belt is delivered to through electric vibrating feeder, Wingdale is transported to the individual layer building stones sieve that shakes by wide-angle belt to sieve, wherein rock screen uses it for anything else except to refuse bin, qualified Wingdale then sieves by chute to intermediate belt by shaking, then by building stones storehouse before intermediate belt to kiln.The qualified Wingdale in the front storehouse of kiln, after scale hooper before kiln weighs, send into winch hoister hopper, by windlass, Wingdale is delivered to kiln apex stone material scale hooper, Wingdale is sent into by a bobbing machine and reversible belt machine the revolving top be located on two kiln cylinders again, finally by distributor, Wingdale is sent into kiln.
(2) and the Fuel lance flowed in a kiln thorax (kiln thorax 1) in heat accumulating type limestone kiln is inserted in Wingdale stock column, carrier gas carries fuel and sprays in kiln thorax by Fuel lance;
(3) by burner blower, the oxygen enrichment of oxygen concentration >95% is fed as combustion-supporting gas by also flowing heat accumulating type limekiln top, under the draft of burner blower, combustion-supporting gas flows down to zone of combustion and fuel meets, and fuel is burnt below the spout of Fuel lance;
(4) at the zone of combustion of current kiln thorax (kiln thorax 1), Wingdale absorbs the heat that fuel combustion produces, and decomposes and generates unslaked lime and CO 2gas;
(5) discharging after the cooling gas that the unslaked lime produced at the zone of combustion of current kiln thorax (kiln thorax 1) is fed by cooling blower carries out being cooled to 80 DEG C ~ 100 DEG C;
When kiln thorax 1 is calcined, coal dust sprays in kiln thorax 1 by fuel nozzle, CO 2combustion-supporting gas (carrier gas of transfer the fuel) enters from kiln top spray, and the bottom of two kiln thoraxes passes into CO 2cold gas (being fed the cooling gas of zone of combustion by cooling blower), CO 2temperature is that the high temperature CaO of 1000 DEG C ~ 1150 DEG C is cooled to 80 DEG C ~ 100 DEG C by cold gas.
(6) cooling gas rises to connecting passage place after being heated by unslaked lime, the CO generated with decomposition of limestone 2the CO that gas and fuel combustion produce 2gas and vapor permeation enters another kiln thorax (kiln thorax 2) by connecting passage and rises, and enters preheating zone carry out preheating to Wingdale through zone of combustion;
(7) heat release reduces to temperature after Wingdale and discharges by pre-thermogenetic flue gas, by udst separation, produces the CO that volumetric concentration is greater than 95% 2gas, this CO 2gas 5% as the carrier gas of transfer the fuel, 65% as the cooling gas being fed cooling zone by cooling blower, and all the other 30% directly store or make dry ice product;
(8) first burnout cycle complete, and flow various air-flow in heat accumulating type limestone kiln and stop flowing, and flow heat accumulating type limestone kiln and start commutation work, turnaround time 45s, unslaked lime from and draw off bottom the kiln thorax flowing heat accumulating type limestone kiln.
Commutation work: combustion air change-over valve changes position, and combustion air relief valve is opened, and cooling air relief valve is opened, and discharge shutter is opened.
Former day 450 tons, lime and flow the CO of heat accumulating type limestone kiln discharge every day 2amount is 385 ~ 415 tons, and after the inventive method, the exhaust gas volumn recycled entering the part of air compressor is 231 ~ 270 tons, and the exhaust gas volumn of storage 164 ~ 184 tons, reduces fume emission, decrease environmental pollution.
Embodiment 2
Based on CO in the present embodiment 2enrichment and flow heat accumulating type limestone kiln system architecture as shown in Figure 1, the cleaning apparatus of the employing in system is sack cleaner, and fuel is coal dust.From the dust concentration≤50mg/Nm of the flue gas that venting port is discharged 3.
Adopt above-mentioned and flow heat accumulating type limestone kiln system production unslaked lime (CaO), unslaked lime day output 500 tons, 80 production cycles of every day, per production cycle coal dust amount 265kg ~ 300kg, combustion air coefficient of excess 1.1 ~ 1.4.
Based on CO 2enrichment and flow heat accumulating type limestone kiln producing and manufacturing technique, comprise the following steps:
(1) at first combustion period, raw limestone is delivered to scale hooper from building stones storehouse before kiln, raw limestone loads in truck and is transported to and flows heat accumulating type limekiln top after scale hooper weighs, and enters and flows in two kiln thoraxes (kiln thorax 1 and kiln thorax 2) in heat accumulating type limestone kiln;
(2) and the Fuel lance flowed in a kiln thorax (kiln thorax 1) in heat accumulating type limestone kiln is inserted in Wingdale stock column, carrier gas carries fuel and sprays in kiln thorax by Fuel lance;
(3) fed by also flowing heat accumulating type limekiln top by combustion-supporting gas by burner blower, under the draft of burner blower, combustion-supporting gas flows down to zone of combustion and fuel meets, and fuel is burnt below the spout of Fuel lance; Described combustion-supporting gas is the oxygen enrichment of oxygen concentration >95%;
(4) at the zone of combustion of current kiln thorax (kiln thorax 1), Wingdale absorbs the heat that fuel combustion produces, and decomposes and generates unslaked lime and CO 2gas;
(5) discharging after the cooling gas that the unslaked lime produced at the zone of combustion of current kiln thorax (kiln thorax 1) is fed by cooling blower carries out being cooled to 80 DEG C ~ 100 DEG C;
When kiln thorax 1 is calcined, coal dust sprays in kiln thorax 1 by fuel nozzle, CO 2combustion-supporting gas (carrier gas of transfer the fuel) enters from kiln top spray, and the bottom of two kiln thoraxes passes into CO 2cold gas (being fed the cooling gas of zone of combustion by cooling blower), CO 2temperature is that the high temperature CaO of 1000 DEG C ~ 1150 DEG C is cooled to 80 DEG C ~ 100 DEG C by cold gas.
(6) cooling gas rises to connecting passage place after being heated by unslaked lime, the CO generated with decomposition of limestone 2the CO that gas and fuel combustion produce 2gas and vapor permeation enters another kiln thorax (kiln thorax 2) by connecting passage and rises, and enters preheating zone carry out preheating to Wingdale through zone of combustion;
(7) heat release reduces to temperature after Wingdale and discharges by pre-thermogenetic flue gas, by udst separation, produces the CO that volumetric concentration is greater than 95% 2gas, this CO 2gas 10% as the carrier gas of transfer the fuel, 55% as the cooling gas being fed cooling zone by cooling blower, and all the other 35% directly store or make dry ice product;
(8) first burnout cycle complete, and flow various air-flow in heat accumulating type limestone kiln and stop flowing, and flow heat accumulating type limestone kiln and start commutation work, turnaround time 50s, unslaked lime from and draw off bottom the kiln thorax flowing heat accumulating type limestone kiln.
Commutation work: combustion air change-over valve changes position, and combustion air relief valve is opened, and cooling air relief valve is opened, and discharge shutter is opened.
Former day 500 tons, lime and flow the CO of heat accumulating type limestone kiln discharge every day 2amount is 425 ~ 460 tons, and after the inventive method, the exhaust gas volumn recycled entering the part of air compressor is 255 ~ 276 tons, and the exhaust gas volumn of storage 170 ~ 184 tons, reduces fume emission, decrease environmental pollution.
Embodiment 3
Based on CO in the present embodiment 2enrichment and flow heat accumulating type limestone kiln system architecture as shown in Figure 1, the cleaning apparatus of the employing in system is sack cleaner, and fuel is coal dust.From the dust concentration≤50mg/Nm of the flue gas that venting port is discharged 3.
Adopt above-mentioned and flow heat accumulating type limestone kiln system production unslaked lime (CaO), unslaked lime day output 550 tons, 80 production cycles of every day, per production cycle coal dust amount 290 kg ~ 330kg, combustion air coefficient of excess 1.1 ~ 1.4.
Based on CO 2enrichment and flow heat accumulating type limestone kiln producing and manufacturing technique, comprise the following steps:
(1) at first combustion period, raw limestone is delivered to scale hooper from building stones storehouse before kiln, raw limestone loads in truck and is transported to and flows heat accumulating type limekiln top after scale hooper weighs, and enters and flows in two kiln thoraxes (kiln thorax 1 and kiln thorax 2) in heat accumulating type limestone kiln;
(2) and the Fuel lance flowed in a kiln thorax (kiln thorax 1) in heat accumulating type limestone kiln is inserted in Wingdale stock column, carrier gas carries fuel and sprays in kiln thorax by Fuel lance;
(3) fed by also flowing heat accumulating type limekiln top by combustion-supporting gas by burner blower, under the draft of burner blower, combustion-supporting gas flows down to zone of combustion and fuel meets, and fuel is burnt below the spout of Fuel lance; Described combustion-supporting gas is the oxygen enrichment of oxygen concentration >95%;
(4) at the zone of combustion of current kiln thorax (kiln thorax 1), Wingdale absorbs the heat that fuel combustion produces, and decomposes and generates unslaked lime and CO 2gas;
(5) discharging after the cooling gas that the unslaked lime produced at the zone of combustion of current kiln thorax (kiln thorax 1) is fed by cooling blower carries out being cooled to 80 DEG C ~ 100 DEG C;
When kiln thorax 1 is calcined, coal dust sprays in kiln thorax 1 by fuel nozzle, CO 2combustion-supporting gas (carrier gas of transfer the fuel) enters from kiln top spray, and the bottom of two kiln thoraxes passes into CO 2cold gas (being fed the cooling gas of zone of combustion by cooling blower), CO 2temperature is that the high temperature CaO of 1000 DEG C ~ 1150 DEG C is cooled to 80 DEG C ~ 100 DEG C by cold gas.
(6) cooling gas rises to connecting passage place after being heated by unslaked lime, the CO generated with decomposition of limestone 2the CO that gas and fuel combustion produce 2gas and vapor permeation enters another kiln thorax (kiln thorax 2) by connecting passage and rises, and enters preheating zone carry out preheating to Wingdale through zone of combustion;
(7) heat release reduces to temperature after Wingdale and discharges by pre-thermogenetic flue gas, by udst separation, produces the CO that volumetric concentration is greater than 95% 2gas, this CO 2gas 8% as the carrier gas of transfer the fuel, 60% as the cooling gas being fed cooling zone by cooling blower, and all the other 32% directly store or make dry ice product;
(8) first burnout cycle complete, and flow various air-flow in heat accumulating type limestone kiln and stop flowing, and flow heat accumulating type limestone kiln and start commutation work, turnaround time 40 s, unslaked lime from and draw off bottom the kiln thorax flowing heat accumulating type limestone kiln.
Commutation work: combustion air change-over valve changes position, and combustion air relief valve is opened, and cooling air relief valve is opened, and discharge shutter is opened.
Former day 450 tons, lime and flow the CO of heat accumulating type limestone kiln discharge every day 2amount is 470 ~ 510 tons, and after the inventive method, the exhaust gas volumn recycled entering the part of air compressor is 282 ~ 306 tons, and the exhaust gas volumn of storage 188 ~ 204 tons, reduces fume emission, decrease environmental pollution.

Claims (5)

1. one kind based on CO 2enrichment and flow heat accumulating type limestone kiln producing and manufacturing technique, it is characterized in that, comprise the following steps:
(1) at first combustion period, raw limestone is delivered to scale hooper from building stones storehouse before kiln, raw limestone loads in truck and is transported to and flows heat accumulating type limekiln top after scale hooper weighs, and enters and flows in two kiln thoraxes in heat accumulating type limestone kiln;
(2) and the Fuel lance flowed in a kiln thorax in heat accumulating type limestone kiln is inserted in Wingdale stock column, carrier gas carries fuel and sprays in kiln thorax by Fuel lance;
(3) fed by also flowing heat accumulating type limekiln top by combustion-supporting gas by burner blower, under the draft of burner blower, combustion-supporting gas flows down to zone of combustion and fuel meets, and fuel is burnt below the spout of Fuel lance;
(4) at the zone of combustion of current kiln thorax, Wingdale absorbs the heat that fuel combustion produces, and decomposes and generates unslaked lime and CO 2gas;
(5) discharging after the cooling gas that the unslaked lime produced at the zone of combustion of current kiln thorax is fed by cooling blower carries out being cooled to 80 DEG C ~ 100 DEG C;
(6) cooling gas rises to connecting passage place after being heated by unslaked lime, the CO generated with decomposition of limestone 2the CO that gas and fuel combustion produce 2gas and vapor permeation enters another kiln thorax by connecting passage and rises, and enters preheating zone carry out preheating to Wingdale through zone of combustion;
(7) heat release reduces to temperature after Wingdale and discharges by pre-thermogenetic flue gas, by udst separation, produces the CO that volumetric concentration is greater than 95% 2gas, this CO 2the part of gas is as the carrier gas of transfer the fuel, and another part is as the cooling gas being fed cooling zone by cooling blower, and all the other directly store or make dry ice product;
(8) first burnout cycle complete, and flow various air-flow in heat accumulating type limestone kiln and stop flowing, and flow heat accumulating type limestone kiln and start commutation work, turnaround time 40 s ~ 50s, unslaked lime from and draw off bottom the kiln thorax flowing heat accumulating type limestone kiln.
2. according to claim 1 based on CO 2enrichment and flow heat accumulating type limestone kiln producing and manufacturing technique, it is characterized in that, step (3) described combustion-supporting gas is the oxygen enrichment of oxygen concentration >95%.
3. according to claim 1 based on CO 2enrichment and flow heat accumulating type limestone kiln producing and manufacturing technique, it is characterized in that, the CO that the volumetric concentration described in described step (7) is greater than 95% 2in gas 30% ~ 35% CO 2gas directly stores or makes dry ice product.
4. according to claim 1 or 3 based on CO 2enrichment and flow heat accumulating type limestone kiln producing and manufacturing technique, it is characterized in that, the CO that the volumetric concentration described in described step (7) is greater than 95% 2in gas, 5% ~ 10% as the carrier gas of transfer the fuel.
5. according to claim 1 or 3 based on CO 2enrichment and flow heat accumulating type limestone kiln producing and manufacturing technique, it is characterized in that, the CO that the volumetric concentration described in described step (7) is greater than 95% 2in gas, 55% ~ 65% as the cooling gas being fed zone of combustion by cooling blower.
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WO2022238387A1 (en) 2021-05-11 2022-11-17 Tecforlime Decarbonation process of carbonated materials in a multi-shaft vertical kiln
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CN107755971A (en) * 2016-08-18 2018-03-06 上海宝冶建设工业炉工程技术有限公司 The nonstandard ash discharge system preparation method of double-hearth lime kiln
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CN108504814A (en) * 2018-05-09 2018-09-07 东北大学 A kind of gas-based shaft kiln directly reduced iron cooling system
CN108314336A (en) * 2018-05-09 2018-07-24 王长春 A kind of lime kiln device using circulating air
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