CN101799244A - Comprehensive utilization method of industrial furnace gas - Google Patents
Comprehensive utilization method of industrial furnace gas Download PDFInfo
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- CN101799244A CN101799244A CN201010149598A CN201010149598A CN101799244A CN 101799244 A CN101799244 A CN 101799244A CN 201010149598 A CN201010149598 A CN 201010149598A CN 201010149598 A CN201010149598 A CN 201010149598A CN 101799244 A CN101799244 A CN 101799244A
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
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Abstract
The invention relates to a comprehensive utilization method of industrial furnace gas, which belongs to the field of metallurgy, in particularly to utilization of industrial furnace gas which mainly comprises CO2. The invention achieves the purposes of providing the comprehensive utilization method of the industrial furnace gas and enhancing utilization value of components and heat in the furnace gas. The method comprises the steps of: A, preheating and removing impurities of the industrial furnace gas; B, decomposing CO2 in the industrial furnace gas treated in step A into CO by using a catalyst at the temperature of not more than 1450 DEG C; and C, usually only using waste heat resources in the reutilization of the industrial furnace gas of CO obtained in step B. In the method, CO2 is effectively used without waste; a catalytic technology is adopted for converting CO2 into CO; the waste heat of the furnace gas is thoroughly used for providing a heat source for a catalytic reaction; when CO2 is catalyzed and converted into CO gas, heat loss is less; therefore, the waste heat resources and CO can be used for largely reducing the utilization of the heat source and a carbon source for realizing the comprehensive utilization of the furnace gas.
Description
Technical field
The invention belongs to field of metallurgy, relate to the method for comprehensive utilization of industrial furnace gas, be specially and mainly contain CO
2The utilization of industrial furnace gas.
Background technology
For mainly containing CO
2Industrial furnace gas, present processing method generally is dust impurity or the SO with wherein
2, H
2After the disagreeableness impurity of environment such as S is removed, directly be disposed to atmosphere; Perhaps its waste heat is utilized.
As: the metal oxide reducing process, promptly metal oxide (as oxides such as copper, iron, chromium, titaniums) reacts the technology that obtains metal with reducing agent, and when adopting carbonaceous reducing agent in reduction process, the high-temperature furnace gas main component that the reduction back produces is CO, CO
2And solid impurity.Processing mode for this class furnace gas generally is to adopt the mode of oxygen-enriched air burning, outside reduction furnace, builds in addition to be used fully, as: utilize cogeneration, oven dry or pre-heating technique raw material; Or after furnace gas added normal temperature air and cool off, the mode that adopts transformation absorption was to CO, CO
2Separate, the CO after separating is heated to technology is temperature required to be used for reduction again, with isolated CO
2Discharge.Above-mentioned treatment process: cogeneration, oven dry or pre-heating technique raw material, can utilize the heat in the furnace gas, but can cause a large amount of CO
2Discharging; Because of the CO in the furnace gas effectively not being utilized, can increase the output of main technology reducing gas CO simultaneously, and then increase the consumption of carbon.Adopt the mode of cooling back transformation absorption, though reusable edible CO, because of cooling step and transformation adsorbing and removing CO
2Step all needs a large amount of equipment investment and operating cost, when the CO after the separation recycles as reducing agent, has increased the storage link, and also need consume energy is heated to the needed technological temperature of reduction, has increased operation energy consumption, so the financial cost of this method is than higher.
For effectively utilizing industrial furnace gas, reduce CO
2Discharge, comply with the main trend of low-carbon emission, this area is badly in need of development new technologies and is solved the problems of the technologies described above.
Summary of the invention
Technical problem solved by the invention provides a kind of method of comprehensive utilization of industrial furnace gas, at be mainly to contain CO
2Industrial furnace gas, reduce CO
2Discharging improves carbon source and afterheat utilization value in the furnace gas, and this method is achieved through the following technical solutions:
A, industrial furnace gas is carried out the preliminary treatment removal of impurities;
B, in being no more than 1450 ℃ temperature environment, with the CO in the industrial furnace gas of catalyst after with processing of step A
2Resolve into CO;
C, the CO that utilizes step B to obtain.
During industrial furnace gas in the past utilizes again, generally be the simple residual heat resources of utilizing, and the inventive method is in order effectively to utilize CO wherein
2, do not allow it drain in vain, adopt Catalytic processes with CO
2Be used after changing into CO; Also made full use of the waste heat of furnace gas, for catalytic reaction provides thermal source; Catalysis CO
2When changing into CO gas, thermal loss seldom so utilize this part residual heat resources and CO can significantly reduce the use of thermal source and carbon source, plays the effect of energy-saving and emission-reduction, has realized that carbon source and heat effectively fully utilize in the furnace gas.
In the method for above-mentioned comprehensive utilization industrial furnace gas, steps A is an impurity of understanding the catalytic efficiency that influence step B in order to remove to the industrial furnace gas preliminary treatment, and mainly influencing impurity has SO
2, flue dust etc., promptly carry out corresponding desulfurization, dust removal process.If also contain the impurity that other can influence catalytic efficiency in the industrial furnace gas, remove impurity earlier according to the processing method of existing conventional after, carry out the catalytic decomposition of step B again.
Utilize catalyst decomposes CO among the step B
2Become the technology of CO to be existing technology, catalyst commonly used has carbonaceous catalyst, superheated vapor, nickel-base catalyst, ferrum-based catalyst, and common catalytic reaction condition is no more than 1450 ℃, generally catalytic decomposition in 750-1450 ℃ hot environment.The independent applications catalyst of above-mentioned catalytic decomposition technology is with CO
2Decompose when making CO,, cause energy consumption higher and operating cost is high, generally seldom use no practical significance because reaction temperature is higher.In the inventive method, use the waste heat that utilizes furnace gas of this Catalytic processes maximizing, promptly utilize waste heat in the reducing process to the catalyst chamber heat supply, with CO
2Resolve into CO, avoid in the past when using this Catalytic processes, use because of heat supply causes high being difficult to of operating cost.
Because the catalyst difference of using causes the catalytic efficiency difference, from the gas that step B catalytic decomposition obtains, might be the very high gas of CO purity; Also might CO content higher, contain CO
2And the mist of other inevitable impurity arranged; Also might be that CO content is lower, contain more CO
2, and the mist of other inevitable impurity is arranged; So at catalysis CO
2The time, can select the Catalytic processes of catalytic efficiency and operating cost doulbe-sides' victory to realize as far as possible.Aspect the gas that utilizes catalytic decomposition to obtain, both CO wherein can be separated, collects the back application, also can directly this gas be collected the back and use, this gas directly can also be utilized by pipeline transportation to corresponding technology.As the CO that decomposition is obtained drop into the metal oxide reducing process once more, the technology that maybe can use CO carries out Joint Production, can reach the recycling of carbon source, realized low-carbon emission; After the catalytic decomposition to obtain gas temperature also higher, preferably this gas is directly fed next step reaction, realize that waste heat effectively utilizes, produce bigger economic worth and social value.
The inventive method has realized the comprehensive utilization of industrial furnace gas, and major advantage is as follows:
1, reduces CO
2Discharging, realize almost not having CO
2Discharging, environmentally friendly.
2, no longer be independent industrial furnace gas cogeneration, oven dry or the preheating raw material of industry of utilizing, but recycling residual heat is reduced main technology in metal oxide, reduced process energy consumption, saved the energy.
3, with CO
2Resolve into CO, realize the recycling of carbon source, reduced the use amount of carbon.
To sum up, the inventive method has realized effective utilization of carbon source and waste heat in the furnace gas, has also overcome the existing Catalytic processes of independent use and has decomposed CO
2The problem that cost is high has reduced energy resource consumption, especially in metallic reducing industry, no longer depends on resources such as coke, natural gas unduly, and poor Jiao, the area that lacks natural gas are produced great strategic importance.
Description of drawings
The method of comprehensive utilization flow chart of Fig. 1 industrial furnace gas of the present invention.
Fig. 2 uses the furnace gas of the inventive method comprehensive utilization metal oxide reducing process.
The specific embodiment
Below by specific description of embodiments of the present invention the explanation but do not limit the present invention.
The inventive method is at mainly containing CO
2Industrial furnace gas or tail gas handle, realize to reduce CO
2Discharging effectively utilizes carbon resource in waste heat and the furnace gas, reduces the purpose of energy consumption.
Particularly, the method for comprehensive utilization of industrial furnace gas provided by the invention comprises the steps (see figure 1):
A, industrial furnace gas is carried out the preliminary treatment removal of impurities;
B, in being no more than 1450 ℃ temperature environment, with the CO in the industrial furnace gas of catalyst after with processing of step A
2Resolve into CO;
C, the CO that utilizes step B to obtain.
Decomposing recyclable being used in of the CO that obtains needs CO to participate in the technology of reaction, can also utilize the waste heat of furnace gas to participate in catalysis CO
2Resolve into the reaction of CO, and need to be used to CO to participate in the technology of reaction the waste heat after the catalytic decomposition, or adopt modes such as conventional generating, drying, preheating material to utilize waste heat.
Furnace gas being carried out preliminary treatment such as desulfurization, dedusting is in order to prevent SO
2, impurity effect step B such as flue dust catalytic efficiency, so in actual application, can remove the gaseous impurity or the solid impurity that influence catalytic efficiency targetedly earlier at the situation of industrial furnace gas and tail gas itself.Particularly, in the Catalytic processes of step B, the catalyst of employing can be used carbonaceous catalyst, superheated vapor, nickel-base catalyst, ferrum-based catalyst.Make catalyst if adopt carbon to add overheated steam, temperature is high more, CO
2Resolution ratio also just high more.Catalytic temperature is different according to different catalyst, when specifically using, can take all factors into consideration the suitable reaction temperature condition of selecting according to catalyst cost and energy consumption cost.
In the methods of the invention, especially obvious at metal oxide with the high-temperature furnace gas utilization ratio that the carbonaceous reducing agent reduction produces, see Fig. 2, generally be in 750-1450 ℃ high temperature, to reduce in this reducing process, CO participates in reduction reaction as reducing agent, belongs to gas-solid reaction.Because the relation of gas speed and air pressure, the CO that participates in reacting has only 25-35%, and a large amount of CO reducing gas does not participate in reaction, but the CO that after simple gas-solid heat exchange, generates with the participation reaction
2Be discharged from outside the stove together.According to differences such as furnace type structure, gas speed, furnace pressures, the temperature that discharges out of the furnace is also inequality, and is generally between 350-900 ℃, that have even higher.
If the CO in the furnace gas of metal oxide reducing process generation is recycled as reducing agent again, must remove the wherein CO more than 80%
2, could keep the reducing atmosphere in the stove.And existing transformation suction type separation of C O, CO
2, mainly be because absorption is to adopt molecular sieve adsorption, just can carry out so furnace gas must be as cold as normal temperature, separate the back as will need and utilize, also need row heating again, cause cost of investment height, operation energy consumption height, be unfavorable for actual production.
Utilizing waste heat in the existing technology generally is that the high-temperature furnace gas that will produce is used for cogeneration, waste heat oven dry or is used for the pre-heating technique raw material, and overall availability is not high.But when adopting the inventive method, this high-temperature furnace gas is in preprocessing process such as desulfurization, dedusting, and temperature is decreased between 20--30 ℃, and thermal loss is little, furnace gas after the processing continues to be heated to 750-1450 ℃ and enters catalytic reactor (being generally catalyst chamber) and use catalyst decomposes, generates CO; Here the heating of indication, just reduction furnace being reacted required heating process has been used in earlier on the catalytic reactor (catalyst chamber), enter the reduction furnace of metal oxide reducing process when generating high temperature CO again, required can the power consumption of reduction reaction makes full use of the waste heat of cartalytic decomposition effect in the technical process.
After the furnace gas that the metal oxide reducing process is produced adopts the inventive method catalysis to obtain CO, cycle applications is in the metal oxide reducing process, realized low-carbon emission, or even non-carbon-emitting, effectively utilized carbonaceous components and the waste heat in the furnace gas, existing technology only can use waste heat, or only can use the part component and have tangible improvement.
To sum up, the inventive method is applied to the comprehensive utilization of industrial furnace gas, and especially metal oxide is with the furnace gas that carbonaceous reduction obtains, and has simplely, and the site technique workflow reengineering is convenient, and feasibility is strong, the advantage that application prospect is wide.
Claims (7)
1. the method for comprehensive utilization of industrial furnace gas, the main component in the described industrial furnace gas is CO
2, it is characterized in that: it comprises the steps:
A, industrial furnace gas is carried out preliminary treatment to remove impurity;
B, in being no more than 1450 ℃ temperature environment, with the CO in the industrial furnace gas of catalyst after with processing of step A
2Resolve into CO;
C, the CO that utilizes step B to obtain.
2. the method for comprehensive utilization of industrial furnace gas according to claim 1, it is characterized in that: the described preliminary treatment of steps A is desulfurization.
3. the method for comprehensive utilization of industrial furnace gas according to claim 1 and 2 is characterized in that: the described preliminary treatment dedusting of steps A.
4. the method for comprehensive utilization of industrial furnace gas according to claim 1, it is characterized in that: the described catalyst of step B is one or more in carbonaceous catalyst, superheated vapor, nickel-base catalyst, the ferrum-based catalyst.
5. the method for comprehensive utilization of industrial furnace gas according to claim 1 is characterized in that: be the industrial furnace gas catalysis in 750-1450 ℃ environment that makes after the processing among the step B.
6. the method for comprehensive utilization of industrial furnace gas according to claim 1, it is characterized in that: the CO that utilizes step B to obtain is with the reducing agent of CO as reducing metal oxide.
7. according to the method for comprehensive utilization of each described industrial furnace gas of claim 1-6, it is characterized in that: described industrial furnace gas is the furnace gas that the metal oxide reducing process produces.
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| CN201010149598A CN101799244A (en) | 2010-04-19 | 2010-04-19 | Comprehensive utilization method of industrial furnace gas |
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| CN201010149598A CN101799244A (en) | 2010-04-19 | 2010-04-19 | Comprehensive utilization method of industrial furnace gas |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303910A (en) * | 1999-07-02 | 2001-07-18 | 西北化工研究院 | Gasification process for reducing CO2 to prepare CO |
| CN1952084A (en) * | 2006-10-19 | 2007-04-25 | 杜文广 | Method for producing liquefied natural gas from coke oven gas |
| CN101144035A (en) * | 2007-09-29 | 2008-03-19 | 张成顺 | Method for directly preparing coal gas from industrial high temperature CO2 waste gas |
-
2010
- 2010-04-19 CN CN201010149598A patent/CN101799244A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303910A (en) * | 1999-07-02 | 2001-07-18 | 西北化工研究院 | Gasification process for reducing CO2 to prepare CO |
| CN1952084A (en) * | 2006-10-19 | 2007-04-25 | 杜文广 | Method for producing liquefied natural gas from coke oven gas |
| CN101144035A (en) * | 2007-09-29 | 2008-03-19 | 张成顺 | Method for directly preparing coal gas from industrial high temperature CO2 waste gas |
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Open date: 20100811 |