CN107235647A - Oxygen/carbon dioxide combustion technology applied to cement clinker production technology - Google Patents
Oxygen/carbon dioxide combustion technology applied to cement clinker production technology Download PDFInfo
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- CN107235647A CN107235647A CN201710519607.4A CN201710519607A CN107235647A CN 107235647 A CN107235647 A CN 107235647A CN 201710519607 A CN201710519607 A CN 201710519607A CN 107235647 A CN107235647 A CN 107235647A
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- flue gas
- raw material
- oxygen
- preheater
- air
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/364—Avoiding environmental pollution during cement-manufacturing
- C04B7/367—Avoiding or minimising carbon dioxide emissions
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
- C04B7/4476—Selection of the kiln atmosphere
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/36—Arrangements of air or gas supply devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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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
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/18—Carbon capture and storage [CCS]
Abstract
The present invention is on a kind of oxygen/carbon dioxide combustion technology applied to cement clinker production technology, first via air cools down clinker, the first via high-temperature flue gas after clinker is cooled down as Secondary Air and enters rotary kiln, the second road high-temperature flue gas preheats the O for being passed through dore furnace by heat-exchanger rig2/CO2Gas, cogeneration is carried out subsequently into waste heat boiler；Second road air enters rotary kiln by burner；The flue gas of rotary kiln discharge enters preheated raw meal in preheater one, and the flue gas that preheater one is discharged enters waste heat boiler；The flue gas of dore furnace discharge enters the preheated raw meal of preheater two；Preheater two produces backflow flue gas CO2Concentration is more than after 95%, the oxygen mix that a part is isolated with the 3rd road air by preheating the O decomposed into dore furnace as raw material2/CO2The CO that concentration is more than 99% is obtained after atmosphere, another part purifying and dedusting and compression2.In the cement clinker production technology of the present invention compared with traditional cement clinker production technology, CO2Discharge capacity reduce 60% 75%.
Description
Technical field
It is more particularly to a kind of to be applied to clinker production the present invention relates to a kind of oxygen/carbon dioxide combustion technology
The oxygen/carbon dioxide combustion technology of technique.
Background technology
CO2Caused greenhouse effects constantly aggravate, and cement industry is CO2Maximum discharge source, its discharge CO2Account for industry
Produce the 5% of total release, cement kiln CO2Discharge is mainly derived from carbonate decomposition and coal dust firing in raw material, wherein raw
Carbonate decomposition accounts for 60% in material.Often the CO2 of production 1kg cement discharge is about 0.6kg-0.7kg, cement industry CO2Discharge
Amount is only second to power industry and occupies second, CO2Emission reduction is very urgent.
Cement industry CO2Emission-reduction technology mainly has replacement of fuel, improves heat transfer efficiency and reduces clinker dosage etc., its
Middle CO2Trapping and storing technology (Carbon Capture and Storage, abbreviation CCS) are the focuses of current research application.
CO2Trapping technique is broadly divided into pre-combustion capture, post-combustion capture and O2/CO2Combustion technology.Pre-combustion capture technology is only capable of catching
Collect part CO in fuel2, this fraction is relatively low；Post-combustion capture technology mainly traps CO in flue gas2, such as chemisorbed, physics
Absorption and membrane separation technique etc., due to CO in flue gas2Concentration not high (about 30%) and containing a large amount of N2Deng, therefore trapping is difficult, disappears
Mass energy is consumed, cost is higher.By contrast, O2/CO2Combustion technology arresting efficiency is higher and cost is reduced.
O2/CO2Combustion technology is first by the O in air2Separate, then by its with containing a large amount of high concentration COs2Recycling
Flue gas mixing participates in burning, so as to form O in rotary kiln and dore furnace2/CO2Combustion atmospheres, make the CO in recovered flue gas2Replace
For N2, simultaneously because diatomic gas N2There is no radianting capacity, CO2With radianting capacity so that radiant heat transfer ability in rotary kiln
Strengthen, clinker is improved, while CO2Substitute N2, greatly reduce NOxDischarge, kills two birds with one stone.What prior art was proposed " uses
O2/CO2Combustion technology is enriched with CO2Cement clinker production technology ", the technique fully achieve under the present conditions it is extremely difficult, should
Cement kiln is fully sealed technological requirement, can not be met under current working condition；O in next technique2/CO2Combustion position
It is different from conventional air combustion position to be designed, it is necessary to update cement kiln completely, including rotary kiln, cooler, burner, preheating
Device, dore furnace even refractory material etc..
The content of the invention
It is a primary object of the present invention to there is provided oxygen/titanium dioxide that a kind of new application generates technique in clinker
Carbon burning technology, technical problem to be solved is it is effectively reduced cement kiln CO2Discharge, thus more suitable for practicality.
The object of the invention to solve the technical problems is realized using following technical scheme.According to present invention proposition
A kind of oxygen/carbon dioxide combustion technology applied to cement clinker production technology, it includes following technological process:By thing
Stream is dried the raw material after homogenizing and preheated into bi serie preheater, the raw material by preheating enter dore furnace in O for2/
CO2Decomposed under atmosphere, the hot raw material after decomposition are calcined into rotary kiln, cool down, obtained after cooling subsequently into cooler
Clinker；
The O in clinker production process2/CO2Gaseous mixture is recycled by following process：Air is divided into the entrance of three tunnels
Kiln system；
First via air flow is：First via air blasts the high-temperature flue gas bag after cooler cooling clinker, cooling clinker
Include first via high-temperature flue gas and the second road high-temperature flue gas；The first via high-temperature flue gas directly enters rotary kiln as Secondary Air and supplies kiln
Fuel combustion；Second road high-temperature flue gas preheats the O for being passed through dore furnace by heat-exchanger rig2/CO2Gas, the flue gas passes through
Enter waste heat boiler after heat-exchanger rig and carry out cogeneration, then pass to raw material flour mill drying raw material；
Second road air flow is：Second road air enters rotary kiln by burner；
3rd road air flow is：3rd road air isolates oxygen by air-separating plant, then with preheater two
Enter the O that dore furnace is decomposed as raw material after a part of backflow flue gas mixing out and after heat-exchanger rig is preheated2/CO2Gas
Atmosphere；
The flue gas of rotary kiln discharge enters preheated raw meal in preheater one, and the flue gas that preheater one is discharged enters waste heat
Boiler carries out cogeneration, and then the flue gas is passed through raw material flour mill drying raw material；
The flue gas of dore furnace discharge is preheated into preheater two to raw material, and the backflow flue gas that preheater two is produced is divided into
Two parts, a part of backflow flue gas after heat-exchanger rig is preheated with entering what dore furnace was decomposed as raw material after oxygen mix
O2/CO2Atmosphere, another part backflow flue gas obtains the CO that concentration is more than 99% after purifying and dedusting and compression2。
The object of the invention to solve the technical problems can be also applied to the following technical measures to achieve further.
It is preferred that, the foregoing oxygen/carbon dioxide combustion technology applied to cement clinker production technology, wherein described
CO in the backflow flue gas that preheater two is produced2Concentration is more than 95%.
It is preferred that, the foregoing oxygen/carbon dioxide combustion technology applied to cement clinker production technology, wherein described
The concentration for the oxygen that air-separating plant is isolated is 21%-100%.
It is preferred that, the foregoing oxygen/carbon dioxide combustion technology applied to cement clinker production technology, wherein described
Partial reflux flue gas and the O of oxygen mix that preheater two is produced2/CO2O in mixed gas2The volume fraction for accounting for total gas is
21%-80%.
It is preferred that, the foregoing oxygen/carbon dioxide combustion technology applied to cement clinker production technology, wherein described
Second road air enters rotary kiln by burner, is divided into coal wind and net wind, and coal wind conveys fuel to rotary kiln, net wind regulation fire
Flame shapes and sizes.
It is preferred that, the foregoing oxygen/carbon dioxide combustion technology applied to cement clinker production technology, wherein described
Raw material are 850-890 DEG C by the flue-gas temperature of thermal decomposition time-division solution stove in dore furnace.
It is preferred that, the foregoing oxygen/carbon dioxide combustion technology applied to cement clinker production technology, wherein described
The temperature of Secondary Air is 1100-1200 DEG C.
It is preferred that, the foregoing oxygen/carbon dioxide combustion technology applied to cement clinker production technology, wherein described
Cooling down the high-temperature flue gas after clinker also includes the 3rd road high-temperature flue gas；The 3rd road high-temperature flue gas enters coal mill system.
By above-mentioned technical proposal, the present invention generates the oxygen/carbon dioxide combustion technology of technique applied to clinker
At least there are following advantages：
(1) CO2 emission reductions are obvious in the present invention, CO in clinker production process of the invention2Discharge is most of to be come from
Raw material are decomposed in dore furnace, in cement clinker production technology of the invention compared with traditional cement clinker production technology, CO2's
Discharge capacity reduces 60%-75%.
(2) present invention changes small, of the invention O to cement kiln apparatus2/CO2Combustion technology is only used for dore furnace,
O is realized in dore furnace2/CO2Combustion atmosphere, other production process apparatus, such as rotary kiln, cooler, raw mill need not
Redesign and change, maintain original present situation constant, greatly reduction investment and operating cost.
(3) meal calcining rate and hot raw meal quality are improved in the present invention.The O of the present invention2/CO2Combustion technology is applied to decompose
It is O after stove, in dore furnace2/CO2Atmosphere, compared in dore furnace in traditional handicraft be high concentration N2, CO2Radianting capacity is strong, by force
Meal calcining rate can be improved under heat exchange, certain condition by having changed in stove, and dore furnace is stable, and hot raw meal quality is improved,
Beneficial to sinter leaching.
(4) it is directed into dore furnace O2/CO2The relatively low phenomenon of flue-gas temperature, the present invention sets heat-exchanger rig, by ripe
A large amount of high-temperature flue gas that material cooling is produced enter back into dore furnace by heat-exchanger rig, solve that dore furnace flue-gas temperature is relatively low to ask
Topic.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And can be practiced according to the content of specification, below with presently preferred embodiments of the present invention and coordinate accompanying drawing describe in detail as after.
Brief description of the drawings
Fig. 1 is the flow chart for being applied to the oxygen/carbon dioxide combustion technology that clinker generates technique.
Embodiment
Further to illustrate the present invention to reach the technological means and effect that predetermined goal of the invention is taken, below in conjunction with
Accompanying drawing and preferred embodiment, to being burnt according to the oxygen/carbon dioxide proposed by the present invention for generating technique applied to clinker
Technology its embodiment, feature and its effect, are described in detail as after.In the following description, different " embodiment " or
What " embodiment " referred to is not necessarily same embodiment.In addition, the special characteristic or feature in one or more embodiments can be by any
Suitable form is combined.
As shown in figure 1, a kind of oxygen/bis- applied to cement clinker production technology that one embodiment of the present of invention is proposed
Carbonoxide combustion technology, it includes following technological process:For flow direction of material, raw material are dried by raw material flour mill, right
Dried clinker homogenizing, is preheated subsequently into preheater one and preheater two, enters dore furnace by the raw material of preheating
In O2/CO2Decomposed under atmosphere, the hot raw material after decomposition are calcined into rotary kiln, and rotary kiln fuel fires in air atmosphere
Burn, for raw material calcining, the material after calcining is cooled down into cooler, and clinker is obtained after cooling；
The O in clinker production process2/CO2Gaseous mixture is recycled by following process：Air is divided into the entrance of three tunnels
Kiln system；
First via air flow is：First via air blasts the high-temperature flue gas bag after cooler cooling clinker, cooling clinker
Include first via high-temperature flue gas and the second road high-temperature flue gas；The first via high-temperature flue gas directly enters rotary kiln as Secondary Air and supplies kiln
Fuel combustion；Second road high-temperature flue gas changes the O that preheating is passed through dore furnace by heat-exchanger rig2/CO2Gas, flue gas warp
Cross after heat-exchanger rig and enter waste heat boiler progress cogeneration, then pass to raw material flour mill drying raw material；
Second road air flow is：Second road air enters rotary kiln by burner；
3rd road air flow is：3rd road air isolates oxygen by air-separating plant, then with preheater two
A part of backflow flue gas out is mixed in mixing arrangement, and dore furnace conduct is entered after mixing and after heat-exchanger rig exchanges heat
The O that raw material are decomposed2/CO2Atmosphere；
The flue gas of rotary kiln discharge enters preheated raw meal in preheater one, and the flue gas that preheater one is discharged enters waste heat
Boiler carries out cogeneration, and then the flue gas is passed through raw material flour mill drying raw material；
The flue gas of dore furnace discharge is preheated into preheater two to raw material, and the backflow flue gas that preheater two is produced is divided into
Two parts, a part of backflow flue gas is as circulating flue gas with entering dore furnace conduct after oxygen mix after heat-exchanger rig is preheated
The O that raw material are decomposed2/CO2Atmosphere, another part backflow flue gas obtains concentration after purifying and dedusting and compression and is more than 99%
CO2。
Fuel respectively enters rotary kiln and dore furnace is burnt.Rotary kiln fuel burns in air atmosphere, is used for
Clinker burning；Fuel is in O in dore furnace2/CO2Burnt in atmosphere, for decomposing raw material.
Preferably, the present embodiment is applied to the preheating in the oxygen/carbon dioxide combustion technology of clinker generation technique
CO in the backflow flue gas that device two is produced2Concentration is more than 95%, for recycling.
Preferably, the present embodiment is applied to the air in the oxygen/carbon dioxide combustion technology of clinker generation technique
The concentration for the oxygen that separator is isolated is 21%-100%.
Preferably, the present embodiment is applied to preheater in the oxygen/carbon dioxide combustion technology of clinker generation technique
The O of the two partial reflux flue gases produced and oxygen mix2/CO2O in mixed gas2The volume fraction for accounting for total gas is 21%-
80%.
Preferably, the present embodiment is applied to second in the oxygen/carbon dioxide combustion technology of clinker generation technique
Road air enters rotary kiln by burner, is divided into coal wind and net wind, and coal wind conveys fuel to rotary kiln, and net wind adjusts flame-shaped
Shape and size.
Preferably, the present embodiment is applied to dore furnace in the oxygen/carbon dioxide combustion technology of clinker generation technique
Interior raw material are 850-890 DEG C by the flue-gas temperature of thermal decomposition time-division solution stove.
Generated preferably, the present embodiment is applied to clinker two described in the oxygen/carbon dioxide combustion technology of technique
The temperature of secondary wind is 1100-1200 DEG C.
As shown in figure 1, preferably, the present embodiment is applied to the oxygen/carbon dioxide burning skill that clinker generates technique
The high-temperature flue gas after cooling clinker in art also includes the 3rd road high-temperature flue gas, and the 3rd road high-temperature flue gas enters coal and grinds system
System.
Embodiment 1
Humidity into the raw material of raw material flour mill is 10%, and the flue gas of waste heat boiler discharge enters raw material flour mill to life
Material is dried, and dried raw material humidity is 0.5%, and homogenizing to raw material, the raw material after homogenizing respectively enter preheater
One and preheater two in preheat, raw material after preheating enter in dore furnace in O2/CO2Atmosphere is decomposed, and the temperature of dore furnace is 880-
890 DEG C, the raw material after decomposition are calcined into rotary kiln, and rotary kiln fuel burns in air atmosphere, is forged for raw material
Burn, the material after calcining is cooled down into cooler, and clinker is obtained after cooling.In this process, air is divided into the entrance of three tunnels
Kiln system.First via air, which blasts the high-temperature flue gas discharged after cooler cooling clinker, cooling clinker from cooler, includes the
High-temperature flue gas and the second road high-temperature flue gas all the way, first via high-temperature flue gas directly enter rotary kiln as Secondary Air and fired for kiln fuel
Burn, the temperature of Secondary Air is 1150-1180 DEG C；Second road high-temperature flue gas preheats the O for being passed through dore furnace by heat-exchanger rig2/CO2
Gas, the flue gas enters waste heat boiler after heat-exchanger rig and carries out cogeneration, then passes to raw material flour mill drying raw material.
Second road air enters rotary kiln by burner.3rd road air isolates concentration for 90% oxygen by air-separating plant
Gas, a part of backflow flue gas then come out with preheater two is mixed, O in mixed gas2The volume fraction for accounting for total gas is
50%, mixed gas enters the O that dore furnace is decomposed as raw material after heat-exchanger rig is preheated2/CO2Atmosphere.Rotary kiln is arranged
The flue gas gone out enters preheated raw meal in preheater one, and the flue gas that preheater one is discharged enters waste heat boiler and carries out cogeneration, so
The flue gas is passed through raw material flour mill drying raw material afterwards.The flue gas of dore furnace discharge is preheated into preheater two to raw material, in advance
CO in the backflow flue gas that hot device two is produced2Concentration be 98%, it is divided into two parts, a part of backflow flue gas with after oxygen mix
Enter the O that dore furnace is decomposed as raw material after heat-exchanger rig is preheated2/CO2Atmosphere, another part backflow flue gas is by purification
The CO that concentration is more than 99% is obtained after dedusting and compression2。
Meal calcining rate is 95% in the present embodiment.
Under equal conditions, the present embodiment compares traditional cement clinker production technology, its CO2Discharge capacity reduces 75%.
Embodiment 2
Humidity into the raw material of raw material flour mill is 12%, and the flue gas of waste heat boiler discharge enters raw material flour mill to life
Material is dried, and dried raw material humidity is 0.8%, and homogenizing to raw material, the raw material after homogenizing respectively enter preheater
One and preheater two in preheat, raw material after preheating enter in dore furnace in O2/CO2Atmosphere is decomposed, and the temperature of dore furnace is 870-
880 DEG C, the raw material after decomposition are calcined into rotary kiln, and rotary kiln fuel burns in air atmosphere, is forged for raw material
Burn, the material after calcining is cooled down into cooler, and clinker is obtained after cooling.In this process, air is divided into the entrance of three tunnels
Kiln system.First via air, which blasts the high-temperature flue gas discharged after cooler cooling clinker, cooling clinker from cooler, includes the
High-temperature flue gas and the second road high-temperature flue gas all the way, first via high-temperature flue gas directly enter rotary kiln as Secondary Air and fired for kiln fuel
Burn, the temperature of Secondary Air is 1120-1150 DEG C；Second road high-temperature flue gas preheats the O for being passed through dore furnace by heat-exchanger rig2/CO2
Gas, the flue gas enters waste heat boiler after heat-exchanger rig and carries out cogeneration, then passes to raw material flour mill drying raw material.
Second road air enters rotary kiln by burner.3rd road air isolates concentration for 80% oxygen by air-separating plant
Gas, a part of backflow flue gas then come out with preheater two is mixed, O in mixed gas2The volume fraction for accounting for total gas is
40%, mixed gas enters the O that dore furnace is decomposed as raw material after heat-exchanger rig is preheated2/CO2Atmosphere.Rotary kiln is arranged
The flue gas gone out enters preheated raw meal in preheater one, and the flue gas that preheater one is discharged enters waste heat boiler and carries out cogeneration, so
The flue gas is passed through raw material flour mill drying raw material afterwards.The flue gas of dore furnace discharge is preheated into preheater two to raw material, in advance
CO in the backflow flue gas that hot device two is produced2Concentration be 96%, it is divided into two parts, a part of backflow flue gas with after oxygen mix
Enter the O that dore furnace is decomposed as raw material after heat-exchanger rig is preheated2/CO2Atmosphere, another part backflow flue gas is by purification
The CO that concentration is more than 99% is obtained after dedusting and compression2。
Meal calcining rate is 96% in the present embodiment.
Under equal conditions, the present embodiment compares traditional cement clinker production technology, its CO2Discharge capacity reduces 70%.
Embodiment 3
Humidity into the raw material of raw material flour mill is 8%, and the flue gas of waste heat boiler discharge enters raw material flour mill to life
Material is dried, and dried raw material humidity is 1%, and homogenizing to raw material, the raw material after homogenizing respectively enter preheater one
Preheated with preheater two, the raw material after preheating enter in dore furnace in O2/CO2Atmosphere is decomposed, and the temperature of dore furnace is 850-
860 DEG C, the raw material after decomposition are calcined into rotary kiln, and rotary kiln fuel burns in air atmosphere, is forged for raw material
Burn, the material after calcining is cooled down into cooler, and clinker is obtained after cooling.In this process, air is divided into the entrance of three tunnels
Kiln system.First via air, which blasts the high-temperature flue gas discharged after cooler cooling clinker, cooling clinker from cooler, includes the
High-temperature flue gas and the second road high-temperature flue gas all the way, first via high-temperature flue gas directly enter rotary kiln as Secondary Air and fired for kiln fuel
Burn, the temperature of Secondary Air is 1110-1130 DEG C；Second road high-temperature flue gas preheats the O for being passed through dore furnace by heat-exchanger rig2/CO2
Gas, the flue gas enters waste heat boiler after heat-exchanger rig and carries out cogeneration, then passes to raw material flour mill drying raw material.
Second road air enters rotary kiln by burner.3rd road air isolates concentration for 70% oxygen by air-separating plant
Gas, a part of backflow flue gas then come out with preheater two is mixed, O in mixed gas2The volume fraction for accounting for total gas is
30%, mixed gas enters the O that dore furnace is decomposed as raw material after heat-exchanger rig is preheated2/CO2Atmosphere.Rotary kiln is arranged
The flue gas gone out enters preheated raw meal in preheater one, and the flue gas that preheater one is discharged enters waste heat boiler and carries out cogeneration, so
The flue gas is passed through raw material flour mill drying raw material afterwards.The flue gas of dore furnace discharge is preheated into preheater two to raw material, in advance
CO in the backflow flue gas that hot device two is produced2Concentration be 95%, it is divided into two parts, a part of backflow flue gas with after oxygen mix
Enter the O that dore furnace is decomposed as raw material after heat-exchanger rig is preheated2/CO2Atmosphere, another part backflow flue gas is by purification
The CO that concentration is more than 99% is obtained after dedusting and compression2。
Meal calcining rate is 95% in the present embodiment.
Under equal conditions, the present embodiment compares traditional cement clinker production technology, its CO2Discharge capacity reduces 60%.
The above described is only a preferred embodiment of the present invention, any formal limitation not is made to the present invention, according to
Any simple modification, equivalent variations and the modification made according to the technical spirit of the present invention to above example, still fall within this hair
In the range of bright technical scheme.
Claims (8)
1. a kind of oxygen/carbon dioxide combustion technology applied to cement clinker production technology, it is characterised in that：It includes as follows
Technological process:For flow direction of material, dry the raw material after homogenizing and preheated into bi serie preheater, by the raw material of preheating
Into dore furnace in O2/CO2Decomposed under atmosphere, the hot raw material after decomposition are calcined into rotary kiln, cold subsequently into cooler
But, clinker is obtained after cooling；
The O in clinker production process2/CO2Gaseous mixture is recycled by following process：Air is divided into three tunnels and enters kiln
System；
First via air flow is：The high-temperature flue gas that first via air blasts after cooler cooling clinker, cooling clinker includes the
High-temperature flue gas and the second road high-temperature flue gas all the way；The first via high-temperature flue gas directly enters rotary kiln as Secondary Air for kiln internal combustion
Material burning；Second road high-temperature flue gas preheats the O for being passed through dore furnace by heat-exchanger rig2/CO2Gas, the flue gas is by heat exchange
Enter waste heat boiler after device and carry out cogeneration, then pass to raw material flour mill drying raw material；
Second road air flow is：Second road air enters rotary kiln by burner；
3rd road air flow is：3rd road air isolates oxygen by air-separating plant, is then come out with preheater two
The mixing of a part of backflow flue gas after and enter after heat-exchanger rig is preheated the O that is decomposed as raw material of dore furnace2/CO2Atmosphere；
The flue gas of rotary kiln discharge enters preheated raw meal in preheater one, and the flue gas that preheater one is discharged enters waste heat boiler
Cogeneration is carried out, then the flue gas is passed through raw material flour mill drying raw material；
The flue gas of dore furnace discharge is preheated into preheater two to raw material, and the backflow flue gas that preheater two is produced is divided into two
Point, a part of backflow flue gas after heat-exchanger rig is preheated with entering the O that dore furnace is decomposed as raw material after oxygen mix2/CO2
Atmosphere, another part backflow flue gas obtains the CO that concentration is more than 99% after purifying and dedusting and compression2。
2. the oxygen/carbon dioxide combustion technology according to claim 1 applied to cement clinker production technology, its feature
It is, CO in the backflow flue gas that described preheater two is produced2Concentration is more than 95%.
3. the oxygen/carbon dioxide combustion technology according to claim 1 applied to cement clinker production technology, its feature
It is, the concentration for the oxygen that described air-separating plant is isolated is 21%-100%.
4. the oxygen/carbon dioxide combustion technology according to claim 1 applied to cement clinker production technology, its feature
It is, partial reflux flue gas and the O of oxygen mix that preheater two is produced2/CO2O in mixed gas2Account for the volume integral of total gas
Number is 21%-80%.
5. the oxygen/carbon dioxide combustion technology according to claim 1 applied to cement clinker production technology, its feature
It is, the second described road air enters rotary kiln by burner, is divided into coal wind and net wind, coal wind conveying fuel to revolution
Kiln, net wind regulation flame profile and size.
6. the oxygen/carbon dioxide combustion technology according to claim 1 applied to cement clinker production technology, its feature
It is, raw material are 850-890 DEG C by the flue-gas temperature of thermal decomposition time-division solution stove in dore furnace.
7. the oxygen/carbon dioxide combustion technology according to claim 1 applied to cement clinker production technology, its feature
It is, the temperature of the Secondary Air is 1100-1200 DEG C.
8. the oxygen/carbon dioxide combustion technology according to claim 1 applied to cement clinker production technology, its feature
It is, the high-temperature flue gas after described cooling clinker also includes the 3rd road high-temperature flue gas, and the 3rd road high-temperature flue gas enters coal
Grinding system.
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| CN112390553A (en) * | 2019-08-12 | 2021-02-23 | 天津水泥工业设计研究院有限公司 | Can realize CO2Zero-emission cement kiln system and method for preparing cement clinker |
| CN112390551A (en) * | 2019-08-12 | 2021-02-23 | 天津水泥工业设计研究院有限公司 | Adjustable CO reformed from off-line decomposer2Enrichment cement kiln system and method |
| CN112608049A (en) * | 2020-12-16 | 2021-04-06 | 天津水泥工业设计研究院有限公司 | Cyclic preheating low-energy-consumption carbon-enriched cement production system and method |
| CN112654828A (en) * | 2019-08-12 | 2021-04-13 | 天津水泥工业设计研究院有限公司 | Cement predecomposition kiln system and method for preparing cement clinker |
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| CN114163151A (en) * | 2021-11-23 | 2022-03-11 | 天津水泥工业设计研究院有限公司 | By using CO2Carbon emission reduction method and system for storing solar energy to calcine cement clinker |
| CN114249550A (en) * | 2021-11-23 | 2022-03-29 | 天津水泥工业设计研究院有限公司 | CO for calcining cement by utilizing solar energy and hydrogen energy2Zero-emission production process and system |
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| CN115159876A (en) * | 2022-06-29 | 2022-10-11 | 天津水泥工业设计研究院有限公司 | Low-energy-consumption carbon capture cement clinker production system and cement clinker preparation method |
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| CN114644472B (en) * | 2020-12-17 | 2023-10-03 | 中国科学院工程热物理研究所 | Cement material processing device and cement material processing method |
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| CN114735956A (en) * | 2022-03-04 | 2022-07-12 | 华东理工大学 | Low-carbon production method and system of cement clinker |
| CN114772961B (en) * | 2022-05-05 | 2023-09-19 | 合肥工业大学 | Process for producing cement and carbon monoxide by co-pyrolysis of cement raw material and solid-phase carbon |
| CN114772961A (en) * | 2022-05-05 | 2022-07-22 | 合肥工业大学 | Process for producing cement and carbon monoxide by co-pyrolysis of cement raw meal and solid-phase carbon source |
| CN115159876A (en) * | 2022-06-29 | 2022-10-11 | 天津水泥工业设计研究院有限公司 | Low-energy-consumption carbon capture cement clinker production system and cement clinker preparation method |
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