CN105274278A - Control device and method for converter smelting through CO2 and argon of rotary kiln - Google Patents
Control device and method for converter smelting through CO2 and argon of rotary kiln Download PDFInfo
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- CN105274278A CN105274278A CN201510306296.4A CN201510306296A CN105274278A CN 105274278 A CN105274278 A CN 105274278A CN 201510306296 A CN201510306296 A CN 201510306296A CN 105274278 A CN105274278 A CN 105274278A
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- rotary kiln
- argon
- converter smelting
- carbon dioxide
- control device
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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
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention provides a control device and method for converter smelting through CO2 and argon of a rotary kiln. The control device comprises a rotary kiln part and a converter smelting part. An inner cylinder combustion chamber used for performing combustion to generate a heat source and an outer cylinder calcining compartment used for containing to-be-calcined limestone are arranged in the rotary kiln. A heat transmission wall is arranged between an inner cylinder and an outer cylinder. After carbon dioxide generated through calcination is collected through a preheater and a gas collecting pipe, dust removing, drying and pressurizing are carried out on the carbon dioxide, then the carbon dioxide enters pressure buffering tanks, and the clean carbon dioxide is obtained. The converter smelting part comprises a composite carbon dioxide and argon blowing control system mainly composed of the carbon dioxide and argon pressure buffering tanks, pressure detecting devices, flow detecting devices, temperature detecting devices, electromagnetic valves, adjusting valves and the like. During smelting, the respective electromagnetic valves and the respective adjusting valves are used for performing controlling, carbon dioxide blowing is carried out in the earlier stage and the medium stage, argon blowing is carried out in the later stage, and the electromagnetic valves and the adjusting valves can complement one another. According to the control device and method, the steelmaking production cost is reduced, the carbon emission and greenhouse effect can be reduced, and the control device and method conform to circular economy.
Description
Technical field
The present invention relates to iron and steel metallurgy field, especially the metallurgy industry carbon dioxide that utilizes indirect calcination Wingdale to produce and outer for argon gas compound for the smelting control device of steel-making converter and method.
Background technology
Copenhagen climate change investigation in 2009, makes low-carbon economy become global focus.The Economic Development Mode of low-carbon economy based on less energy-consumption, low stain, low emission, it is the fundamental change of the mode of production to a large amount of fossil energy of existing consumption, a large amount of discharge carbonic acid gas, the Chinese government promises to undertake the year two thousand twenty, the CO2 emissions of per GDP than decline 40-45% in 2005, and is included into national economy and social development medium-term and long-term plans as the binding indicator.
Steel manufacture process Carbon emission accounts for about 16% of industrial carbon dioxide quantity discharged, total release reaches nearly 2,000,000,000 tons, become China Carbon emission rich and influential family, how to reduce Carbon emission and Resources of Carbon Dioxide utilized the attention more and more causing iron and steel worker.
Iron and steel enterprise is rotary kiln for the main kiln type of calcination particulate lime at present, and this type of kiln is used for calcination 20-40mm small grain size Wingdale, adopts coal gas calcination together with Wingdale to produce quickened lime.Because lime burns together with fuel mix, decompose the carbonic acid gas produced and contain residual coal gas, be difficult to the carbonic acid gas reclaiming discharge, and the high-temperature flue gas that burning produces is due to containing a large amount of dust, recovery difficult is larger, cost is high, waste heat is also difficult to utilize, almost directly discharge air at present, pollute environment and energy dissipation, do not want to adapt to the recycling economy of national requirements, low-carbon emission, be therefore badly in need of a kind ofly fundamentally solving that calcined limestone is separated, extracts, the pure CO 2 technology of low cost.
Current domestic converter adopts argon gas bottom blowing to smelt substantially, ladle argon-blown principle is that the argon gas with certain pressure is formed circulation by spray gun or Argon gas permeable brick, in circulation process macrobead be mingled with, deoxidation products flow through top slag lower region time transmit enter top slag, the bubble that Argon is formed simultaneously forms relative vacuum in molten steel, serves the trapping to gas in steel and excretion.Along with the raising of argon gas cost in recent years, and carbon plays an important role in steelmaking process---and not only make steel have good mechanical property, and can react with various oxide compound and gaseous oxygen, serve as main energy source.Therefore need the carbon dioxide seeking to utilize metallurgical production process calcined limestone to produce to be resource, minimizing greenhouse gas emission method substitutes argon gas and carries out converter, stainless smelting control.
Summary of the invention
For the problems referred to above that existing converter steelmaking, calcined limestone exist, the main purpose of technical scheme provided by the invention is: provide a kind of rotary kiln CO
2control device and the method for converter smelting is used for argon gas.
To achieve these goals, present invention employs following technical scheme:
A kind of rotary kiln CO
2be used for the control device of converter smelting with argon gas, it is characterized in that, comprising:
Rotary kiln part, converter smelting part,
Wherein rotary kiln arranges inner core combustion chamber, produces thermal source in order to burning; Urceolus calcining compartment, is treated calcined limestone in order to place, and is separated by inner/outer tube insulated wall and combustion chamber, in order to produce clean carbon dioxide;
Converter smelting part comprises carbon dioxide, the compound of argon gas smelts Controlling System, primarily of carbonic acid gas, argon pressure surge tank, and pressure, flow, temperature-detecting device, the composition such as magnetic valve and variable valve.
Another aspect of the present invention, also comprises the primary heater unit be arranged at above kiln tail, is provided with a plurality of Wingdale room and preheating chamber, and described preheating chamber is by pipeline and rotary kiln combustion chamber UNICOM, and described Wingdale room is through intermediate bin and calcining compartment UNICOM.
Another aspect of the present invention, also comprises the calcined by rotary kiln Wingdale be arranged at for converter steelmaking needs, the carbon dioxide of generation, and sequentially pass through preheating lime stone device, effuser collection, dedusting, dehumidification purification, pressurization enters pressure surge tank.
Another aspect of the present invention, also comprises and is arranged at carbonic acid gas, argon pressure surge tank, magnetic valve, variable valve and proofing unit, for the flow of automatic regulation of carbon dioxide, argon gas.
Another aspect of the present invention, also comprise be arranged at the described converter smelting initial stage, mid-term adopts bottom blowing carbonic acid gas, smelt argon bottom-blowing in latter stage, also whole process can adopt single bottom blowing, two kinds of methods are for subsequent use each other.
Another aspect of the present invention, also comprises and can be directly used in stainless steel art AOD smelting control, smelt initial stage, bottom blowing in mid-term carbonic acid gas, and smelt argon bottom-blowing smelting in latter stage, also whole process can adopt single bottom blowing, two kinds of methods are for subsequent use each other.
Another aspect of the present invention, described gas sampling pipeline is connected with residual heat using device through dedusting, variable frequency adjustment blower fan.
Another aspect of the present invention, the thermal source that rotary kiln inner core calcined limestone produces, through dedusting, variable frequency adjustment blower fan, is connected with waste gas afterheat recovery unit.
Another aspect of the present invention, rotary kiln head is provided with water cooler, and cool fast in order to lime calcining produced, cooled lime is sent through transfer roller and entered finished bin.
A kind of rotary kiln CO
2the control method of converter smelting is used for, comprising following steps with argon gas:
Step 1: provide a kind of rotary kiln, arranges inner core combustion chamber, produces thermal source in order to burning; Urceolus calcining compartment, treats calcined limestone in order to place, arranges heat transfer wall between inner/outer tube.
Step 2: the carbonic acid gas that calcination produces after preheater, effuser are collected, then enters pressure surge tank through dedusting, drying, pressurization, obtains clean carbonic acid gas.
Step 3: provide a kind of argon gas, pressurization enters pressure surge tank.
Step 4: carbonic acid gas, argon pressure surge tank carry out controlling through respective magnetic valve and variable valve when converter smelting and arrange pressure, flow, temperature-detecting device on loop.
Step 5: initial smelting period, mid-term carry out carbonic acid gas blowing, and the later stage carries out argon gas blowing, both can be for subsequent use each other.
By the enforcement to technical solution of the present invention, following technique effect can be obtained:
The carbonic acid gas of 1, discharging is easy to purification, obtains pure carbonic acid gas, substitutes argon gas and is used for converter smelting, makes industrial wastes obtain effective utilization of circulating, is conducive to solving the problem of environmental pollutions such as carbon emission;
2, carbonic acid gas substitutes argon gas blowing, can reduce the volatilization of metallic iron partial oxidation, reduce converter smelting dust emission concentration;
3, adopt carbonic acid gas to substitute argon gas blowing, because argon gas price is 6-8 times of carbonic acid gas price, production cost is obviously reduced, for enterprise brings significant economic benefit;
, owing to there is CO in 4, bottom-blowing of converter carbonic acid gas
2+ C=2CO, generates the CO being blown into gas 2 times, not only can strengthen melting bath stirring, be conducive to the decon that degass, and can improve the quality and quantity reclaiming coal gas of converter.
5, carbon dioxide, argon gas compound are smelted, for subsequent use each other, are both conducive to production operation, and also can improve production operational availability;
6, rotary kiln thermo-efficiency improves, rotary kiln decomposition temperature is easy to control, and avoid energy dissipation, the unit product thermal losses for decomposition of limestone reduces, and can make full use of coal dust firing, or blast furnace, converter, coke oven and mixed gas carry out calcination as fuel;
The flue gas temperature of 7, discharging after burning is high, and recoverable, is converted to steam and generates electricity;
8, calcination of lime is even, is easy to control, and activity degree is good, product purity improves, and sulphur content reduces, and spy is standby is suitable for the interpolation slag making improving steel-making, stainless steel product combustion intensity, high-quality steel grade;
9, the present invention not only fundamentally makes carbon dioxide recovery cost reduce, and carbonic acid gas improves constantly as the application level of resource in field of steel-making, be conducive to the progress advancing process for making, positive effect is served to the Greenhouse effect alleviating air simultaneously, there is significant economic benefit and environmental benefit.
Accompanying drawing explanation
Fig. 1 is a kind of rotary kiln CO of the present invention
2the structural representation of the control device of converter smelting is used for argon gas.
Fig. 2 is a kind of rotary kiln CO of the present invention
2the FB(flow block) of the control method of converter smelting is used for argon gas.
Embodiment
Be described technical scheme of the present invention below by way of specific embodiment, with under the conflict free prerequisite of object of the present invention, the technical characteristic in the embodiment hereinafter mentioned and embodiment can combine mutually.
As shown in Figure 1, the technical solution adopted in the present invention is: rotary kiln part comprises rotary kiln inner core combustion chamber, produces thermal source in order to burning; Urceolus calcining compartment, treats calcined limestone in order to place, arranges heat transfer wall between inner/outer tube.The carbonic acid gas produced after lime kilning stone to Wingdale preheating, enters pressure surge tank through dedusting, drying, pressurization again by preheater after effuser is collected, in order to obtain clean carbon dioxide; Converter smelting part comprises carbon dioxide, the compound of argon gas smelts Controlling System, primarily of carbonic acid gas, argon pressure surge tank, and pressure, flow, temperature-detecting device, the composition such as magnetic valve and variable valve.The argon gas of outer confession directly enters pressure surge tank.Two kinds of gases complete the smelting of converter smelting through respective magnetic valve and governor valve control.
Embodiment of the present invention relates to a kind of rotary kiln CO
2be used for the control device of converter smelting with argon gas, for making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail:
Fig. 1 is device schematic diagram of the present invention, being denoted as in figure: 1-Wingdale discharge opening, 2-primary heater unit, 3-Wingdale room, 4-preheating gas room, 5-feeding machine, 6 intermediate bins, 7-hydraulic push rod, 8-feeding mouth, 9-rotary kiln heat transfer wall, 10-rotary kiln combustion chamber (inner core), 11-calcined by rotary kiln room (urceolus), 12-rotary kiln, the vertical cooling room of 13-, 14-blower fan, 15-gas line, 16-rotary kiln burner, 17-exhaust pipeline, 18-gas sampling pipe, 19-cleaning apparatus, 20-regulates blower fan, 21-residual heat using device, 22-effuser, 23-dedusting and purifying device, 24-variable frequency adjustment blower fan, 25-drying installation, 26-converter, 27-bottom-blowing device, 28-top blast device, 29-variable valve, 61-supercharging device, 62-pressure surge tank, 63-magnetic valve, 64-variable valve, 65-flow detection, 66-magnetic valve, 67-temperature detection, 68-pressure detection, 69-safety valve, 71-supercharging device, 72-pressure surge tank, 73-magnetic valve, 74-variable valve, 75-flow detection, 76-magnetic valve, 77-temperature detection, 78-pressure detection, 79-safety valve.
Main process of the present invention: Wingdale adds in a plurality of Wingdale rooms 3 in heat-exchanger rig 2 by discharge opening 1, discharge opening 1 there is cover plate, automatically open when discharging, self-closed is carried out after discharging, bottom, a plurality of Wingdale room 3 is equipped with feeding machine 5 respectively, Wingdale after preheating is by after feeding machine 5 timing to intermediate bin 6 further preheating, by hydraulic push rod 7, Wingdale is delivered in rotary kiln 12 through feeding mouth 8, when arriving calcination band, give gas through piping 15 outward, the secondary combustion-supporting wind that burner 16 and burner blower 14 are sent here burns, Wingdale quick burning is decomposed, enter the vertical cooling room 13 of kiln hood after decomposition to cool, the hot gas that cooling produces enters rotary kiln as secondary combustion-supporting wind by pipeline through blower fan 14 and circulates, the finished product ash cooled enters ash silo.
The carbon dioxide that in calcined by rotary kiln room 11, calcined limestone produces, preheating lime stone is carried out through intermediate bin 6, preheating is carried out again through 3 pairs, a plurality of preheating lime stone room Wingdale, after collect through effuser 22, carbon dioxide after collection is through dedusting and purifying device 23, variable frequency adjustment blower fan 24, drying installation 25, pressurizing device 61 enters pressure surge tank 62, pressure surge tank 62 is provided with temperature detection 67, pressure detection 68, and safety valve 69, pressure-pot 62 outlet conduit is provided with magnetic valve 63 successively, variable valve 64, flow detector 65, and magnetic valve 66, control flow and the pressure of carbonic acid gas, and enter converter by converter bottom-blowing device and blow, enter top blast device 28 by variable valve 69 to blow.
The outer argon gas that supplies enters pressure surge tank 72 through pressurizing device 71, pressure surge tank 72 is provided with temperature detection 77, pressure detection 78, and safety valve 79, pressure surge tank 72 outlet conduit is provided with successively magnetic valve 73, variable valve 74, flow detector 75 and magnetic valve 76, control the flow of argon gas and pressure, and enter converter by converter bottom-blowing device 27 and blow, enter top blast device 28 by variable valve 69 and blow.
The waste gas that rotary kiln combustion chamber 10 produces is connected with a plurality of preheating gas room 4 by exhaust pipeline 17, and in primary heater unit 2, the Wingdale of Wingdale room 3 carries out preheating.A plurality of preheating gas rooms 4 closed upper part, side is connected with gas sampling pipe 18.Waste gas after preheating is collected by gas sampling pipe 18 and is sent dust-removal system 19, regulates blower fan 20 automatically to regulate the flow of waste gas, enters waste-heat recovery device 21 afterwards for full factory or carry out cogeneration.
It should be noted that in embodiment, rotary system burner combustion system can adopt oxygen-enriched combusting further, energy-saving and cost-reducing, reduces costs.
It should be noted that in above-mentioned embodiment, the quantity of primary heater unit Wingdale room 4 and preheating gas room 5, carry out composite design according to lime actual production output.
Be not difficult to find, the present invention is by utilizing rotary kiln inner/outer tube combustion chamber, calcining compartment, the carbonic acid gas that calcination produces, through simple udst separation, dry, pressurization directly can enter pressure surge tank and use, obtain clean carbon dioxide at low cost, smelt control with the outer compound of carrying out for argon gas, two kinds of gases are not only independent but also for subsequent use each other, converter smelting and stainless steel smelting early stage, mid-term carries out carbonic acid gas blowing, smelt the outer argon gas that supplies of later stage dependence to blow, not only significantly can reduce smelting cost, reduce slag iron loss, strengthening melting bath stirring, improve dephosphorization rate, improve gas recovery quality, and the life-span of bottom blowing system can be improved.For domestic reduction Carbon emission, the integrated application of resource, realize steelmaking process and save energy and reduce the cost and improve steel quality and open the new a kind of approach more having market outlook, really responded national policy, achieve recycling economy and low-carbon energy-saving reduces discharging.
Also comprise a kind of rotary kiln CO2 and argon gas in technical scheme of the present invention for the control method of converter smelting, wherein, as shown in Figure 2, comprise the steps:
Step 1: provide a kind of rotary kiln, arranges inner core combustion chamber, produces thermal source in order to burning; Urceolus calcining compartment, treats calcined limestone in order to place, arranges heat transfer wall between inner/outer tube.
Step 2: the carbonic acid gas that calcination produces after preheater, effuser are collected, then enters pressure surge tank through dedusting, drying, pressurization, obtains clean carbonic acid gas.
Step 3: provide a kind of argon gas, pressurization enters pressure surge tank.
Step 4: carbonic acid gas, argon pressure surge tank carry out controlling through respective magnetic valve and variable valve when converter smelting and arrange pressure, flow, temperature-detecting device on loop.
Step 5: initial smelting period, mid-term carry out carbonic acid gas blowing, and the later stage carries out argon gas blowing, both can be for subsequent use each other.
The above embodiments are only that part of the present invention embodies; can not contain all of the present invention; on the basis of above-described embodiment and accompanying drawing; those skilled in the art can obtain more embodiment according to the present invention under the prerequisite not paying creative work; and similar transformation is carried out to other similar smeltings and similar kiln type, therefore these embodiments obtained under not paying the prerequisite of creative work all should be included in protection scope of the present invention.
Claims (7)
1. a rotary kiln CO
2be used for control device and the method for converter smelting with argon gas, it is characterized in that, comprising:
Rotary kiln part, converter smelting part;
Wherein rotary kiln arranges inner core combustion chamber, produces thermal source in order to burning; Urceolus calcining compartment, is treated calcined limestone in order to place, and is separated by inner/outer tube insulated wall and combustion chamber, in order to produce clean carbon dioxide;
Converter smelting part comprises carbon dioxide, the compound of argon gas smelts Controlling System, primarily of carbonic acid gas, argon pressure surge tank, and pressure, flow, temperature-detecting device, the composition such as magnetic valve and variable valve.
2. a kind of rotary kiln CO as claimed in claim 1
2the control device of converter smelting is used for argon gas, it is characterized in that, also comprise the primary heater unit be arranged at above kiln tail, containing a plurality of Wingdale room and preheating chamber, preheating chamber is by pipeline and rotary kiln combustion chamber UNICOM, and Wingdale room is through intermediate bin and calcining compartment UNICOM.
3. a kind of rotary kiln CO as claimed in claim 1
2the control device of converter smelting is used for argon gas, it is characterized in that, also comprise the calcined by rotary kiln Wingdale for converter steelmaking needs, the carbon dioxide of generation, sequentially pass through preheating lime stone device, effuser collection, dedusting, dehumidification purification, pressurization enters pressure surge tank.
4. a kind of rotary kiln CO as claimed in claim 1
2be used for the control device of converter smelting with argon gas, it is characterized in that, also comprise and be arranged at carbonic acid gas, argon pressure surge tank, magnetic valve, variable valve and proofing unit, for the flow of automatic regulation of carbon dioxide, argon gas.
5. a kind of rotary kiln CO as claimed in claim 1
2be used for the control device of converter smelting with argon gas, it is characterized in that, described converter smelting initial stage, bottom blowing in mid-term carbonic acid gas, smelt argon bottom-blowing in latter stage, also whole process can adopt single bottom blowing, two kinds of methods are for subsequent use each other.
6. a kind of rotary kiln CO as claimed in claim 1
2be used for the control device of converter smelting with argon gas, it is characterized in that, also can be directly used in stainless steel art AOD and smelt control, initial stage, bottom blowing in mid-term carbonic acid gas, smelt argon bottom-blowing smelting in latter stage, also whole process can adopt single bottom blowing, two kinds of methods are for subsequent use each other.
7. a rotary kiln CO
2be used for the control method of converter smelting with argon gas, it is characterized in that, comprise the steps:
Step 1: provide a kind of rotary kiln, arranges inner core combustion chamber, produces thermal source in order to burning; Urceolus calcining compartment, treats calcined limestone in order to place, arranges heat transfer wall between inner/outer tube.
Step 2: the carbonic acid gas that calcination produces after preheater, effuser are collected, then enters pressure surge tank through dedusting, drying, pressurization, obtains clean carbonic acid gas.
Step 3: provide a kind of argon gas, pressurization enters pressure surge tank.
Step 4: carbonic acid gas, argon pressure surge tank carry out controlling through respective magnetic valve and variable valve when converter smelting and arrange pressure, flow, temperature-detecting device on loop.
Step 5: initial smelting period, mid-term carry out carbonic acid gas blowing, and the later stage carries out argon gas blowing, both can be for subsequent use each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510306296.4A CN105274278A (en) | 2015-06-01 | 2015-06-01 | Control device and method for converter smelting through CO2 and argon of rotary kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510306296.4A CN105274278A (en) | 2015-06-01 | 2015-06-01 | Control device and method for converter smelting through CO2 and argon of rotary kiln |
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| CN105274278A true CN105274278A (en) | 2016-01-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510306296.4A Pending CN105274278A (en) | 2015-06-01 | 2015-06-01 | Control device and method for converter smelting through CO2 and argon of rotary kiln |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110093479A (en) * | 2019-03-28 | 2019-08-06 | 山西太钢不锈钢股份有限公司 | A kind of bottom blowing CO2The method of smelting stainless steel |
| CN112250072A (en) * | 2020-12-08 | 2021-01-22 | 小跃科技(北京)有限公司 | Carbon dioxide production system for preparing liquid food grade |
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| CN102353272A (en) * | 2011-07-14 | 2012-02-15 | 周建安 | Comprehensive utilization method for smelting-plant lime-kiln tail gas |
| CN203144295U (en) * | 2013-03-09 | 2013-08-21 | 石家庄新华能源环保科技股份有限公司 | Heat accumulating type dividing-wall heating rotary lime kiln |
| CN104291713A (en) * | 2014-09-29 | 2015-01-21 | 石家庄新华能源环保科技股份有限公司 | Dividing wall type rotary kiln |
| CN205170895U (en) * | 2015-06-01 | 2016-04-20 | 李正福 | Rotary kiln CO2 and argon gas are used for controlling means of converter smelting |
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2015
- 2015-06-01 CN CN201510306296.4A patent/CN105274278A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353272A (en) * | 2011-07-14 | 2012-02-15 | 周建安 | Comprehensive utilization method for smelting-plant lime-kiln tail gas |
| CN203144295U (en) * | 2013-03-09 | 2013-08-21 | 石家庄新华能源环保科技股份有限公司 | Heat accumulating type dividing-wall heating rotary lime kiln |
| CN104291713A (en) * | 2014-09-29 | 2015-01-21 | 石家庄新华能源环保科技股份有限公司 | Dividing wall type rotary kiln |
| CN205170895U (en) * | 2015-06-01 | 2016-04-20 | 李正福 | Rotary kiln CO2 and argon gas are used for controlling means of converter smelting |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110093479A (en) * | 2019-03-28 | 2019-08-06 | 山西太钢不锈钢股份有限公司 | A kind of bottom blowing CO2The method of smelting stainless steel |
| CN112250072A (en) * | 2020-12-08 | 2021-01-22 | 小跃科技(北京)有限公司 | Carbon dioxide production system for preparing liquid food grade |
| CN112250072B (en) * | 2020-12-08 | 2021-03-12 | 小跃科技(北京)有限公司 | Carbon dioxide production system for preparing liquid food grade |
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Application publication date: 20160127 |