CN101264887A - Technique for purifying calcium carbide furnace gas - Google Patents
Technique for purifying calcium carbide furnace gas Download PDFInfo
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- CN101264887A CN101264887A CNA2008100960994A CN200810096099A CN101264887A CN 101264887 A CN101264887 A CN 101264887A CN A2008100960994 A CNA2008100960994 A CN A2008100960994A CN 200810096099 A CN200810096099 A CN 200810096099A CN 101264887 A CN101264887 A CN 101264887A
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- gas
- calcium carbide
- purification
- combustion
- furnace gas
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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
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
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Abstract
The invention relates to a gas purification process for a calcium carbide furnace. The process is characterized in that introduce the mixed calcium carbide furnace gas and combustion supporting oxygen into a combustion section at the bottom of a purification tower for partly combustion; then, the gas from bottom to top comes into a purification section at the central section of the purification tower to be purified under the function of the regenerative reduction filler; after purification, most gas is introduced out from the central section of the purification tower; cool the gas below 160 DEG C and dedust; remove the CO<SUB>2</SUB> in the gas after the gas comes into the decarburization and separation system; then use a pressure swing absorption device to separate the CO and H<SUB>2</SUB> and N<SUB>2</SUB>. The invention adopts the method of introducing the calcium carbide furnace gas into the purification tower and supplying the appropriate amount of oxygen and the regenerative reduction filler for the purification tower to remove the methane, tar, oxygen and other impurities in the calcium carbide furnace gas after three steps in the purification tower; the three stages comprise the combustion step of the furnace gas, the purification step of the furnace gas and the activation step of the regenerative reduction filler; then after the dedusting and decarburization separation, carbon monoxide and hydrogen as chemical materials can be obtained. The process has the advantages of achieving the comprehensive purposes of waste utilization, energy-saving, emission reduction and high value-added utilization for the furnace gas in the production of calcium carbide and improving the economic benefits of the enterprises.
Description
Technical field
The present invention relates to chemical technology field, particularly relate to a kind of purifying process of calcium carbide burner gas.
Background technology
According to the 3rd energy consumption in " calcium carbide industry access condition (revision in 2007) " of National Development and Reform Committee promulgation and comprehensive utilization of resources (two), clear and definite regulation in (three) money: the furnace gas solid dust of closed calcium carbide production equipment (referring to CO gas) must comprehensive utilization, do not allow furnace gas in line or ignite the torch, the powdery furnace charge that produces in the production process must be recycled.The main component of calcium carbide furnace gas is CO, also has O in addition
2, N
2, H
2, CH
4, C
nHm, solid dust.At present, the furnace of calcium carbide type of furnace of domestic calcium carbide manufacturing enterprise is being carried out by the conversion to total closed type of open, semi-hermetic type, but the utilization of calcium carbide burner gas is only rested on the low-level aspect of the combustion heat, the carbon dioxide of discharging is directly polluting atmospheric environment, does not have realization comprehensive utilization truly.
In the closed calcium carbide furnace production process, one ton of calcium carbide of every production can discharge furnace gas 400Nm
3, wherein pure CO is about 300Nm
3The major ingredient of calcium carbide furnace gas is CO, contain a certain amount of oxygen simultaneously, nitrogen, hydrogen, (tar in the furnace gas mainly is to have adopted blue carbon in a large number for methane and tar, electrode pastes etc. contain due to the tar carbon raw), theoretically, CO in the calcium carbide furnace gas can be used for methyl alcohol, the production of synthetic ammonia, also can be used for the production of carbonylation products such as acetic acid, but, because oxygen, the existence of methane and tar, comprehensive utilization process such as the purification of calcium carbide furnace gas and deep processing are very restricted, therefore, at home the situation of Xing Chenging be the user of on the one hand CO by the synthetic in a large number CO of gasification, be on the other hand CO in a large amount of calcium carbide furnace gas by the low-level technology of utilizing as fuel having burnt in vain.
Summary of the invention
Purpose of the present invention just is to overcome the defective of above-mentioned prior art, provide a kind of from enclosed calcium carbide burner gas purifying carbon oxide gas, thereby CO is by the transformation of heat energy to industrial chemicals in the solution calcium carbide burner gas, the purifying process of the calcium carbide burner gas of the energy-saving and emission-reduction that the realization calcium carbide is produced and the comprehensive utilization of high added value.
The present invention is achieved through the following technical solutions:
A kind of purifying process of calcium carbide burner gas, it is characterized in that: carry out partial combustion being incorporated into the burning zone that is positioned at the purification column bottom after calcium carbide burner gas and the combustion-supporting oxygen mix, the purification section that enters the purification column middle part subsequently from bottom to top is after carrying out purifying under the effect of accumulation of heat reduction filler, most of gas is drawn from the purification column middle part and is cooled to back dedusting below 160 ℃, enters the decarburization separation system and removes wherein CO
2, make CO, H with pressure-swing absorption apparatus again
2With N
2Separate and get final product;
Above-mentioned calcium carbide burner gas with combustion-supporting oxygen mix before at first remove wherein coarse particles with cyclone separator;
Small part gas behind the above-mentioned purifying enters the burning zone that is recycled into the purification column bottom behind the activation section on purification column top from bottom to top and participates in reaction, the used activated media of above-mentioned activation section is an accumulation of heat reduction filler, high-temperature gas carries out the exsiccant activation to accumulation of heat reduction filler in the activation section, remove fugitive constituent (as tar, moisture content etc.) wherein, prevent that fugitive constituent in the accumulation of heat reduction filler is to the secondary pollution of purified gas; Wherein said accumulation of heat reduction filler is that the diameter that the coal tar by 60%～75% blue carbon dust, 10%～25% slaked lime and 15%～20% processes is the spheroid of 25～75mm, its requirement of strength: cold strength 〉=60kg/, hot strength 〉=25kg/.The effect that this accumulation of heat reduction filler has two aspects, the one, play and regulate and stable purification column service temperature; The 2nd, with the CO in the gas
2With hydrogen reduction be CO.Slaked lime as the alkaline-earth metal additive can be by a relatively large margin raising reduction reaction activity;
Heat energy in the above-mentioned temperature-fall period is carried out waste heat recovery, but the waste heat byproduct steam of recovery, and hot this waste heat of combustion-supporting oxygen utilization carries out preheating earlier.
The present invention adopts calcium carbide burner gas is fed in the purification column, by an amount of oxygen supply in purification column and filling accumulation of heat reduction filler, make calcium carbide burner gas through the three phases of purification column: after furnace gas burning zone, furnace gas purification section and the accumulation of heat reduction filler activator section, impurity such as wherein contained methane, tar, oxygen have been removed, separate through dedusting and decarburization again, thereby obtain can be used as carbon monoxide and the hydrogen that industrial chemicals uses.The present invention has realized that waste recycling, the energy-saving and emission-reduction in the calcium carbide production reach the purpose to the high added value comprehensive utilization of furnace gas, have improved the business economic benefit.
Description of drawings
Fig. 1 is a production technique block diagram of the present invention;
Fig. 2 is the used purification column structural representation sketch of the present invention.
Embodiment
Specific embodiment of the present invention is:
1. the preparation of accumulation of heat reduction filler:
Blue carbon dust, slaked lime powder and the coal tar that produces during furnace of calcium carbide produced is by (60%～75%): (10%～25%): 15%～20% ratio blending (processing the effect that can reach waste recycling with blue carbon dust), and to be pressed into diameter in ball press be 25～75mm, requirement of strength: cold strength 〉=60kg/, hot strength 〉=25kg/ ball filler.Make blue carbon etc. spherical and be because the spheroid face is smooth relatively, be unfavorable for carrying secretly in the furnace gas deposition of dust, can prevent arch formation simultaneously on its surface.Then the charging system 1 of this ball filler by the purification column cat head joined in the purification column, but continuous charging also can intermittently feed in raw material.In order to guarantee safety, blue carbon ball carried out N before adding
2Or CO
2Displacement.
2. after the calcium carbide burner gas that will be come out by furnace of calcium carbide is removed wherein coarse particles with cyclone separator, again with calcium carbide burner gas and combustion-supporting hot oxygen (this oxygen can be selected pure oxygen or air according to different purposes), mixing the back by injector is burnt by purification column bottom 2 burning zones (combustion chamber 3) that are incorporated into purification column, enter the purification section (purifying chamber 4) of purification column subsequently from bottom to top, the temperature of purification section is controlled at 1200 ℃～1300 ℃, and this temperature can be regulated according to the furnace gas component of coming out of the stove.
Following reaction takes place in the burning of above-mentioned furnace gas and purge process:
The reaction of a, burning zone
CO burning: 2CO+O
2=2CO
2+ 136.2KCal/mol
Methyl hydride combustion: CH
4+ 2O
2=CO
2+ 2H
2O+191.7KCal/mol
Tar burning: C
nHm+ (n+m/4) O
2=nCO
2+ m/2H
2O+Q
Hydrogen burning: 2H
2+ O
2=2H
2O+571.8KCal/mol
Carbon burning: C+O
2=CO
2
Solid dust in this technological process is not participated in reaction.
B, purification reaction:
The burning liberated heat makes furnace gas temperature be elevated to 1200～1300 ℃, enters accumulation of heat reduction filler purification section (active blue carbon ball purification section), reaction below taking place in purification section:
Deoxygenation reaction: 2C+O
2=2CO+59.4KCal/mol
Carbonic acid gas conversion reaction: CO
2+ C=2CO
Conversion of methane: CH
4+ CO
2=2CO+2H
2-59.1KCal/mol
Tar conversion reaction: C
nHm+ (n+m/4) CO
2=2CO+2H
2-59.1KCal/mol
The conversion reaction of water: C+H
2O=CO+H
2-17.9KCal/mol
Except that above reaction, because the purification column temperature, also can be produced the Pintsch process reaction of methane and tar etc. up to 1300 ℃, reaction equation is:
C
nH
m＝nC+m/2H
2
Solid dust in this technological process is not participated in reaction.
3. through the calcium carbide burner gas separated into two parts behind the purifying:
The purified gas of small part is entered the accumulation of heat reduction filler activator section (activating chamber 5) on purification column top from bottom to top by purification section as technology usefulness gas, form with high-temperature distillation activates accumulation of heat reduction filler, make fugitive constituents such as tar evaporation wherein, with the burning zone (combustion chamber 2) of fugitive constituent circulation importing purification column bottom, remove hydrocarbons such as tar and methane by the oxidation of burning zone and the reduction and the fragmentation pattern of purification section.
Most of purified gases is drawn the subsequent disposal system that enters from the middle part purification section of purification column, because this part gas temperature is higher, so at first after residual neat recovering system cools to 140 ℃～180 ℃, enter sack cleaner, remove wherein solid dust and granule foreign.But recovery waste heat byproduct steam wherein, the part heat is as used oxygen of burning zone or preheating of air.
4, the furnace gas after the udst separation is imported the decarburization separation system, in the decarburization separation system, at first remove wherein CO with salt of wormwood
2, make CO, H with pressure-swing absorption apparatus again
2And N
2Separate, nitrogen separation emptying wherein makes CO and H
2Purity reach the requirement of downstream user respectively, promptly can be used as industrial chemicals and further process or use.
Claims (6)
1. the purifying process of a calcium carbide burner gas, it is characterized in that: carry out partial combustion being incorporated into the burning zone that is positioned at the purification column bottom after calcium carbide burner gas and the combustion-supporting oxygen mix, the purification section that enters the purification column middle part subsequently from bottom to top is after carrying out purifying under the effect of accumulation of heat reduction filler, most of gas from the purification column middle part draw be cooled to 140 ℃～180 ℃ after dedusting, enter the decarburization separation system and remove wherein CO
2, make CO, H with pressure-swing absorption apparatus again
2With N
2Separate and get final product.
2. according to the purifying process of the described calcium carbide burner gas of claim 1, it is characterized in that: above-mentioned calcium carbide burner gas with combustion-supporting oxygen mix before at first remove wherein coarse particles with cyclone separator.
3. according to the purifying process of the described calcium carbide burner gas of claim 1, it is characterized in that: the small part gas behind the above-mentioned purifying enters the burning zone that is recycled into the purification column bottom behind the activation section on purification column top from bottom to top and participates in reaction.
4. according to the purifying process of the described calcium carbide burner gas of claim 3, it is characterized in that: the used activated media of above-mentioned activation section is an accumulation of heat reduction filler.
5. according to the purifying process of claim 1 or 4 described calcium carbide burner gas, it is characterized in that: above-mentioned accumulation of heat reduction filler is that the diameter that the coal tar by 60%～75% blue carbon dust, 10%～25% slaked lime and 15%～20% processes is the spheroid of 25～75mm, its requirement of strength: cold strength 〉=60kg/, hot strength 〉=25kg/.
6. according to the purifying process of the described calcium carbide burner gas of claim 1, it is characterized in that: the heat energy in the above-mentioned temperature-fall period is carried out waste heat recovery, but the waste heat byproduct steam of recovery, hot this waste heat of combustion-supporting oxygen utilization carries out preheating earlier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810096099A CN100595143C (en) | 2008-04-23 | 2008-04-23 | Technique for purifying calcium carbide furnace gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810096099A CN100595143C (en) | 2008-04-23 | 2008-04-23 | Technique for purifying calcium carbide furnace gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101264887A true CN101264887A (en) | 2008-09-17 |
| CN100595143C CN100595143C (en) | 2010-03-24 |
Family
ID=39987615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810096099A Expired - Fee Related CN100595143C (en) | 2008-04-23 | 2008-04-23 | Technique for purifying calcium carbide furnace gas |
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| Country | Link |
|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107619055A (en) * | 2016-07-17 | 2018-01-23 | 卓粤 | Tail gas recovery system of calcium carbide furnace |
| CN108126516A (en) * | 2017-12-21 | 2018-06-08 | 宁夏宝塔化工中心实验室(有限公司) | A kind of plasma combustion technology purifying calcium carbide furnace tail gas process |
-
2008
- 2008-04-23 CN CN200810096099A patent/CN100595143C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107619055A (en) * | 2016-07-17 | 2018-01-23 | 卓粤 | Tail gas recovery system of calcium carbide furnace |
| CN108126516A (en) * | 2017-12-21 | 2018-06-08 | 宁夏宝塔化工中心实验室(有限公司) | A kind of plasma combustion technology purifying calcium carbide furnace tail gas process |
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| Publication number | Publication date |
|---|---|
| CN100595143C (en) | 2010-03-24 |
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Granted publication date: 20100324 Termination date: 20110423 |