CN1156330C - Decomposing process for industrially preparing CO2 - Google Patents

Decomposing process for industrially preparing CO2 Download PDF

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CN1156330C
CN1156330C CNB011292555A CN01129255A CN1156330C CN 1156330 C CN1156330 C CN 1156330C CN B011292555 A CNB011292555 A CN B011292555A CN 01129255 A CN01129255 A CN 01129255A CN 1156330 C CN1156330 C CN 1156330C
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carbon
carbon dioxide
tail gas
gas
oxygen
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CN1334138A (en
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桐 吴
吴桐
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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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract

The present invention relates to a decomposition and treatment method carbon dioxide generated by industry. The method comprises: tail gas of carbon dioxide is collected; dust removal and desulphurization treatment are carried out to the collected tail gas; the treated tail gas is loaded in an oxidizing tower for secondary oxidation and degradation processing; the tail gas of reoxidation oxidation is loaded in a reaction tank for decomposition; oxygen after decomposition is exhausted, and carbon gas after decomposition is loaded in an electric carbon-removing machine of a carbon-adsorbing tower for forming carbon powder. The present invention can decompose carbon dioxide generated by industry into oxygen and carbon without pollution to the nature. Thereby, the destruction of carbon dioxide to the environment is prevented.

Description

The decomposing process of industrially preparing CO 2
The invention belongs to the exhaust-gas treatment field, especially a kind of decomposing process of industrially preparing CO 2.
Because the secondary pollution that the industrial development of global range has brought industrial gas emission, especially atmospheric pollution and depletion of the ozone layer serious threat existent environment of people, and the carbon dioxide in the toxic emission destroys one of the most serious pollution sources of environment for human survival especially.Along with atmosphere major pollutants carbon dioxide (CO 2) the continuous increase of discharge capacity, the global harmful effect that is caused mainly is ozone layer depletion aggravation and global warming.
At present, can solve carbon dioxide to environment damage without any a technology.
The decomposing process that the purpose of this invention is to provide a kind of industrially preparing CO 2, it can be decomposed into the carbon dioxide that industry produces oxygen and the carbon that nature is not had pollution, thereby prevents that carbon dioxide is to environment damage.
For achieving the above object, solution of the present invention is: a kind of decomposing process of industrially preparing CO 2, and it comprises:
A, carbon dioxide tail gas is collected;
B, the tail gas of collecting is carried out dedusting and desulfurization is handled;
C, the tail gas after will handling are sent into oxidizing tower and are done the secondary oxidation degradation treatment;
D, the tail gas of secondary oxidation is sent into reactive tank decompose;
E, the oxygen after will decomposing are discharged, and the carbon gas after the decomposition is inhaled tower by a carbon and sent into electric carbon dioxide cleaner and form carbon dust.
In step c, carry out following chemical reaction, in oxidizing tower, tail gas carried out secondary oxidation, reduce the compactness of the molecular structure of carbon dioxide, decomposable process described later is easily carried out:
。
In steps d, carry out following chemical reaction, in reactive tank, decompose:
，
Make carbon dioxide decompose oxygen and carbon.
After step e carries out, can carry out step f again: will inhale extra large washing pool of gas feeding that tower comes out from carbon, washing pool the inside, sea holds seawater, carbon dioxide is fed the form that wherein generates bicarbonate or carbonate, enter a rare earth decomposer then, hold the rare earth decomposed solution in the rare earth decomposer, further be decomposed into oxygen and carbon by the rare earth decomposed solution.
The process of collection and flow measurement can all be set through an end after each step of step a, b, c, d, e, obtain mean concentration and average flow value that this step all gases is afterwards formed, multiply each other by the gas average discharge of mean concentration and actual measurement and to obtain the throughput of this component of unit interval, compare with the component standard throughput data that pre-set, as the inconsistent implementation of then adjusting this step by the actuator that in each step of step a, b, c, d, e, is provided with.
The present invention by tail gas collect, dedusting and desulfurization processing, secondary oxidation degradation treatment, in reactive tank, carry out carbon dioxide is decomposed into carbon monoxide and oxygen, carbon monoxide resolves into carbon and oxygen, become the process that useful carbon and oxygen are discharged at last, reached and prevent the effect of carbon dioxide environment damage.
Because the present invention sent tail gas into oxidizing tower earlier and does the secondary oxidation degradation treatment before reactive tank decomposes, carry out following chemical reaction in oxidizing tower:
So will be as yet not sufficient carbon of oxidation and carbon monoxide fully be oxidized to carbon monoxide and carbon dioxide, reduce the compactness of the molecular structure of carbon dioxide, so just make carbon dioxide branch of the present invention solve to be more prone to and thoroughly.
Because the present invention is after gas is inhaled tower through carbon, again gas is fed an extra large washing pool, washing pool the inside, sea holds seawater, carbon dioxide is fed the form that wherein generates bicarbonate or carbonate, enter a rare earth decomposer then, hold the rare earth decomposed solution in the rare earth decomposer, further be decomposed into oxygen and carbon by the rare earth decomposed solution, further will remain still undecomposed carbon dioxide so again further decomposes, make gas resolve into innocuous gas and carbon more up hill and dale, improved resolution ratio.
In addition, because the process of collection and flow measurement all is set through an end after each step of the present invention, obtain mean concentration and average flow value that this step all gases is afterwards formed, multiply each other and obtain the throughput of this component of unit interval, compare with the component standard throughput data that pre-set, as the inconsistent implementation of then adjusting this step by the actuator in per step, make throughput finally near the component standard, so just finished an intact process of being undertaken the overall process of decomposing is monitored automatically and monitored by computer, with guarantee decomposable process accurately.
Fig. 1 is the flow chart of the decomposing process of industrially preparing CO 2 of the present invention.
Fig. 2 is that the industrial waste gas carbon dioxide decomposes recovery process figure.
Fig. 3 is the process chart of carbon dioxide decomposing system.
Fig. 4 is an oxidizing tower gas degraded FB(flow block).
Fig. 5 is a degraded back decomposable process schematic diagram.
Fig. 6 is an adsorption isotherm line function schematic diagram.
Fig. 7 is extra large washing pool part-structure figure.
Fig. 8 is a computer control software system module schematic diagram of the present invention.
Fig. 9 is a gas sampling processing system modules schematic diagram.
Figure 10 is the decomposing schematic representation of carbon dioxide decomposing module.
Fig. 1 is a method flow diagram of the present invention, can be clear that implementation procedure of the present invention in the drawings.Fig. 2 has provided one and has realized system diagram of the present invention, substantially system of the present invention as can be seen roughly exceptionally gas sampling system, exhaust treatment system, carbon dioxide decomposing system and exhaust emissions system from figure, the corresponding step a of gas sampling system wherein, the corresponding step b of exhaust treatment system, corresponding step c of carbon dioxide decomposing system and d, the corresponding step e of exhaust emissions system.
(1) carbon dioxide tail gas is collected: adopt tail gas collection system that the tail gas of the factories and miness of various large-scale fire coals (gas) such as steel plant, thermal power plant industry is collected, this tail gas collection system has much on the market, so seldom give unnecessary details at this.
(2) tail gas is carried out vent gas treatment such as dedusting, desulfurization.
(3) utilize pressure fan to send into oxidizing tower and do the secondary oxidation degradation treatment handling later tail gas: oxidation is meant that the part that the carbon that will exist in the tail gas and carbon monoxide etc. are not oxidized to carbon dioxide as yet up hill and dale carries out oxidation, make this a part of exhaustive oxidation become carbon dioxide, making tail gas finally mainly contain carbon dioxide forms, helping next step like this can unify carbon dioxide is decomposed, because such oxidation has destroyed the composition of former tail gas, the energy that discharges in the oxidizing process makes that the distance between the carbon dioxide molecule is bigger simultaneously.Reduce CO 2The compactness of molecular structure, decomposition condition falls for the decomposition of the carbon of reactive tank in the next step, oxygen molecule provides.
Oxidizing tower is the device that is used for carrying out secondary oxidation, and a large amount of oxygen of storage in oxidizing tower carries out following chemical reaction therein:
。
Also following reaction may take place:
Which kind of reaction is the main conditions such as oxidizing tower temperature, pressure, gas componant that depend on.
In oxidizing tower, carbon is oxidized to carbon monoxide by oxygen or carbon dioxide, is oxidized to carbon dioxide by water, and carbon monoxide is oxidized to carbon dioxide.Shown in Fig. 4 oxidizing tower gas degraded FB(flow block), this oxidizing tower is the degradation tower on the corresponding diagram in fact, and waste gas enters heat exchanger through the absorption tower, enters degradation tower then and degrades, gas in the degradation tower constantly feeds reboiler and carries out oxygen blast, and then enters circulation of degradation tower formation.
(4) tail gas of secondary oxidation is sent into reactive tank and decomposes, in reactive tank, carry out following chemical reaction:
，
Like this, carbon dioxide resolves into carbon monoxide and oxygen, and carbon monoxide resolves into carbon and oxygen, thereby reaches the purpose that carbon dioxide is fully decomposed.Degraded back decomposable process schematic diagram is sent into air blast with waste gas through preliminary treatment earlier as shown in Figure 5, enters reactive tank then, has a thermophore to give the reactive tank heat supply, finishes above-mentioned chemical reaction in reactive tank, and reaction back gas is exported from reactor.
(5) by vacuum filter the oxygen that decomposes is discharged, the carbon of reactive tank device is inhaled tower the carbon pneumatic transmission is gone into electric carbon dioxide cleaner formation carbon dust, and discharges the waste gas of other composition.
Carbon is inhaled the electric carbon dioxide cleaner principle of tower:
Adopt the equation at constant temperature formula (BET equation) of absorption, that is:
P/V(Po-P)＝1/VmC+(C-1)P/VmCPo
The equilibrium partial pressure Pa of P-adsorbate in the formula
Po-is at the synthermal liquid phase saturated vapour pressure Pa of gas down
The volume ML of V-adsorbate
The C-constant
Absorption rate is N A=Kg (P-Pi)
N A＝Kg(P-Pi)＝K L(Ci-C)
N A＝Kg(P-P *)＝K L(C *-C)
Adsorption isotherm is as shown in Figure 6: its function is A=f (PT)
The overall reaction equation of absorption can be expressed as:
(6) will inhale extra large washing pool of gas feeding that tower comes out from carbon, washing pool the inside, sea holds seawater, carbon dioxide is fed the form that wherein generates bicarbonate or carbonate, enter a rare earth decomposer then, hold the rare earth decomposed solution in the rare earth decomposer, further be decomposed into oxygen and carbon by the rare earth decomposed solution.
Carbon dioxide (CO 2) be the fundamental of animals and plants life circulation.CO in the atmosphere 2Restricted by two factors, the one, photosynthesis of plants, annual spring and summer is when two seasons, photosynthesis was strong, the CO in the atmosphere 2Concentration descends, autumn and winter crop harvesting, photosynthesis weakens, the CO in the atmosphere 2Concentration increases.The 2nd, CO 2Be dissolved in seawater, be stored in the ocean with the form of bicarbonate and carbonate.CO 2Stable in properties, nontoxic, about 5-10 of the holdup time in atmosphere.
Utilize CO in this step 2Be dissolved in the principle of seawater, after gas is come out by carbon suction tower, enter a circulation (sea) washing pool again, CO 2Change into the form of bicarbonate or carbonate, the benefit of the form of this bicarbonate or carbonate is to decompose to get up than being easier to and relatively fully, directly decomposing then decomposition easily not exclusively by carbon dioxide.It is many that this carbon dioxide is dissolved in the reaction equation of seawater, and those skilled in the art relatively knows, thus do not discuss in detail, but the left side of reaction equation generally is carbon dioxide and sodium salt or NaOH, the right generally is bicarbonate or carbonate etc.
Fig. 7 is a structure chart of extra large washing pool.This has air inlet 1, sea intake 2 and exhaust outlet 3 above washing pool of sea, be a circulation cleaning case 4 below.Tail gas enters Xi Chi by air inlet 1, and seawater enters Xi Chi by sea intake 2, mixes, reacts in circulation cleaning case 4, and reaction back gas is discharged by exhaust outlet 3.
In the process chart of Fig. 3 carbon dioxide decomposing system, can see the realization flow of step (3), (4) and (6).
(7) after each above-mentioned step, can be provided with and gather and the process of flow measurement through an end, being provided with one in other words gathers and flow rate-measuring device, obtain mean concentration and average flow value that this step all gases is afterwards formed, multiply each other by the gas average discharge of mean concentration and actual measurement and to obtain the throughput of this component of unit interval, compare with the component standard throughput data that pre-set, as the inconsistent implementation of then adjusting this step, reach the component standard that pre-sets up to the throughput of this component by the actuator that in above-mentioned each step, is provided with.About this actuator aspect, existing at present mature technology is so seldom give unnecessary details at this.
Computing formula is:
Q＝qM
Q=component discharge capacity q=component mean concentration in the formula
M=gas average discharge
The purpose that adopts Computer Control Technology that the overall process of decomposing is monitored automatically and monitored is accurate and carbon, the oxygen rate of recovery that ensures decomposable process.
Carbon dioxide CO 2Gas composition is as follows before and after each system handles of decomposing system technological process:
1. after vent gas treatment, drain into the gas composition of oxidizing tower
Composition CO CO 2 N 2 O 2 H 2 CH 4 Other
Form % 63.9 18.4 9.2 0.15 1.2 0.14 7.01
2. pass through behind the oxidizing tower gas composition to reactive tank
Composition CO CO 2 N 2 O 2 H 2 CH 4 Other
Form % 27.56 54.0 9.2 0.30 1.2 0.14 7.6
3. inhale the gas composition of tower to carbon through reactive tank
Composition CO CO 2 N 2 O 2 C H 2 CH 4 Other
Form % 49.5 16.0 8.9 0.05 5.2 1.2 0.14 18.83
4. inhale the gas composition of tower through carbon to the seawater aeration tower
Composition CO CO 2 N 2 O 2 C H 2 CH 4 Other
Form % 47.5 7.5 8.5 0.1 0.03 1.2 0.55 34.62
5. pass through of the gas composition of seawater aeration tower to the rare earth decomposer
Composition CO CO 2 N 2 O 2 C H 2 CH 4 Other
Form % 13.5 1.2 8.5 0.12 0.5 2.1 0.59 73.49
6. the gas composition through coming out behind the rare earth decomposer
Composition CO CO 2 N 2 O 2 C H 2 CH 4 Other
Form % 10.8 0.5 9.2 3.25 0.65 5.20 1.20 69.20
The carbon dioxide resolution process adopts computer control system, carries out collection, decomposition, recovery, discharging whole process supervision, manually-operated and the intervention of avoiding each subsystem to disperse, realization carbon dioxide decomposition full process automatization.
Below we discuss the working condition of this part computer control system.Fig. 8 is a computer control software system module schematic diagram of the present invention.Can see that in the drawings carbon dioxide resolution process system comprises 5 modules: security of system module, gas sampling processing module, carbon dioxide decomposing module, exhaust emissions module, abnormality processing module.The wherein computer control of the corresponding above-mentioned steps of gas sampling processing module (1) and (2), the computer control of the corresponding above-mentioned steps (3) of carbon dioxide decomposing module, (4) and (6), the computer control of the corresponding step of exhaust emissions module (5).
Gas sampling processing module wherein is divided into again: gas sampling module, the control of corresponding step (1); The exhaust-gas treatment module, the control of corresponding step (2); And abnormality processing.The exhaust-gas treatment module comprises dedusting function module, desulfurizing function module, other processing capacity module and abnormality processing, as shown in Figure 9.
Figure 10 is the decomposing schematic representation of carbon dioxide decomposing module.In the drawings as can be seen, the carbon dioxide decomposing module is by comprising that collection subsystem, decomposing system, cleaning subsystem, recovery system and abnormality processing system constitute.

Claims (4)

1, a kind of decomposing process of industrially preparing CO 2, it comprises:
A, carbon dioxide tail gas is collected;
B, the tail gas of collecting is carried out dedusting and desulfurization is handled;
C, the tail gas after will handling are sent into oxidizing tower and are done the secondary oxidation degradation treatment, carbon and these parts that are not oxidized to carbon dioxide as yet up hill and dale of carbon monoxide of existing in the tail gas are carried out oxidation, tail gas finally mainly is made up of carbon dioxide, its oxidative degradation process is that carbon is oxidized to carbon monoxide by oxygen or carbon dioxide, be oxidized to carbon dioxide by water, carbon monoxide is oxidized to carbon dioxide;
D, the tail gas of secondary oxidation is sent into reactive tank decompose, decomposable process is that the carbon dioxide in the tail gas resolves into carbon monoxide and oxygen, and carbon monoxide resolves into carbon and oxygen, makes finally mainly to comprise oxygen and carbon in the tail gas;
E, the oxygen after will decomposing are discharged, and the carbon gas after the decomposition is inhaled tower by a carbon and sent into electric carbon dioxide cleaner and form carbon dust.
2, the decomposing process of industrially preparing CO 2 according to claim 1, it is characterized in that: in step c, carry out following chemical reaction, in oxidizing tower, tail gas is carried out secondary oxidation, reduce the compactness of the molecular structure of carbon dioxide, decomposable process described later easily carried out:
。
3, the decomposing process of industrially preparing CO 2 according to claim 1 is characterized in that: carry out following chemical reaction in steps d, decompose in reactive tank:
，
Make carbon dioxide decompose oxygen and carbon gas.
4, according to claim 1, the decomposing process of 2 or 3 described industrially preparing CO 2s, it is characterized in that: at step a, b, c, d, the process of collection and flow measurement all is set through an end after each step of e, obtain mean concentration and average flow value that this step all gases is afterwards formed, multiply each other by the gas average discharge of mean concentration and actual measurement and to obtain the throughput of this component of unit interval, compare with the component standard throughput data that pre-set, then pass through at step a as inconsistent, b, c, d, the actuator that is provided with in each step of e is adjusted the implementation of this step.
CNB011292555A 2001-06-19 2001-06-19 Decomposing process for industrially preparing CO2 Expired - Fee Related CN1156330C (en)

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* Cited by examiner, † Cited by third party
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CN108970359A (en) * 2018-06-28 2018-12-11 山东师范大学 A method of utilizing carbon dioxide in solution of potassium carbonate trapping flue gas
CN112619349A (en) * 2020-11-30 2021-04-09 西安西热控制技术有限公司 Carbon emission reduction system of thermal power plant
CN114949647A (en) * 2022-06-06 2022-08-30 北京航空航天大学 System and method for extracting oxygen to prepare respiratory gas

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Publication number Priority date Publication date Assignee Title
WO2020206884A1 (en) * 2019-04-09 2020-10-15 深圳市贝特瑞纳米科技有限公司 Recycling method for positive electrode material, positive electrode material produced, and uses thereof

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