CN103423589A - Liquid oxygen vaporizing system for technology of preparing methanol with coke oven gas and technology - Google Patents
Liquid oxygen vaporizing system for technology of preparing methanol with coke oven gas and technology Download PDFInfo
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- CN103423589A CN103423589A CN2013103780848A CN201310378084A CN103423589A CN 103423589 A CN103423589 A CN 103423589A CN 2013103780848 A CN2013103780848 A CN 2013103780848A CN 201310378084 A CN201310378084 A CN 201310378084A CN 103423589 A CN103423589 A CN 103423589A
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Abstract
The invention discloses a liquid oxygen vaporizing system for a technology of preparing methanol with coke oven gas and the technology. The structure of the liquid oxygen vaporizing system is that an air separation workshop section in the technology of preparing the methanol with the coke oven gas is communicated with a conversion workshop section through an oxygen compressor, the system further comprises a liquid oxygen storage tank and a vaporizer, and inlets of the liquid oxygen storage tank, the vaporizer and the oxygen compressor are sequentially communicated through pipelines. Aiming at the problems that the amount of oxygen can not meet needs of the conversion technology, the conversion rate of the methane is low, and therefore the improvement of the yield of the methanol is limited, an improvement is carried out on the system and method. Through research and exploration of coke oven gas conversion characteristics in the technology of preparing the methanol with the coke oven gas and the liquid oxygen vaporizing device, the method that a liquid oxygen vaporizing technology is improved to increase the yield of the oxygen in an air separation system is provided. Through the liquid oxygen vaporizing device, the system and method improve the amount of the oxygen supplied to the conversion workshop section, improve the temperature of a conversion furnace and enhance the conversion effect of methane, and therefore the yield of the methanol is improved.
Description
Technical field
The present invention relates to a kind of, vaporization of liquid oxygen system and the technique of especially a kind of coke-stove gas methanol technics processed.
Background technique
Coal chemical industry enterprises utilizes coke-stove gas for raw material, by desulfurization, conversion, synthetic, rectifying, the sky workshop section that grades, prepares methyl alcohol.At conversion section, in firing chamber, reburner top, part methane, C in oven gas
nH
m, the oxygen in hydrogen and pure oxygen steam burnt, emit a large amount of heat, to supply with methane conversion institute calorific requirement, the top high-temperature gas enters the bottom catalyst layer, in coke-stove gas, methane and alkynes, alkene are under the nickel accelerant effect, carry out conversion reaction with steam, promote the methane available gas conversion synthetic to methyl alcohol, to promote the carrying out of methyl alcohol synthetic reaction.
In said process, the amount of oxygen deficiency can cause in the burning of reburner top coke-stove gas insufficient, the reburner fire box temperature is low, thereby affect carry out of methane in the conversion reaction of reburner catalyst layer, carbon monoxide content descends, and in synthetic gas, the available gas component content reduces, and methane content exceeds standard, synthetic thick methanol output reduces, restriction methyl alcohol efficiently carry product.Therefore, the size of conversion section amount of oxygen is one of key factor affected coke-stove gas methanol technics production capacity processed.Transform required pure oxygen from supporting sky minute workshop section, by oxygen compressor, enter conversion section, in the situation that amount of oxygen can't meet the technique needs, this workshop section's system is restricted by equipment, is difficult to significantly improve oxygen output, thus the raising of restriction methanol output.
At present, some coal chemical enterprise, for improving amount of oxygen, carry out supplemental oxygen by increasing oxygenerator, but this scheme investment cost is high, and floor space is large, can't adjust oxygen making amount according to need of production, and unnecessary oxygen is let go, and causes great waste.Also need in addition to be equipped with specially operator, increase cost of labor, Economy is poor, is unfavorable for energy efficiency, for enterprise produces, increases burden.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of vaporization of liquid oxygen system of coke-stove gas methanol technics processed of supplementary conversion section amount of oxygen; The present invention also provides the vaporization of liquid oxygen technique of a kind of coke-stove gas methanol technics processed.
For solving the problems of the technologies described above, the technical solution used in the present invention is: the sky minute workshop section in described coke-stove gas methanol technics processed is communicated with conversion section by oxygen compressor, and it is characterized in that: it includes liquid oxygen storage tank and vaporizer; Described liquid oxygen storage tank, vaporizer are communicated with by pipeline successively with the entrance of oxygen compressor.
Pipeline between liquid oxygen storage tank of the present invention and vaporizer is parallel with the pipeline of liquid oxygen pump and middle pressure storage tank formation, and described vaporizer is communicated with the outlet of oxygen compressor.
Vaporizer of the present invention is water bath type vaporizer.
Middle pressure storage tank of the present invention is with self-supercharging device.
The vaporization of liquid oxygen system that process using of the present invention is above-mentioned: (1), when space division system oxygen inflate quantity is low, the liquid oxygen in liquid oxygen storage tank enters conversion section with the oxygen that sky minute workshop section generates through oxygen compressor after the vaporizer vaporization;
(2), when space division system scram or long-term maintenance are stopped, the liquid oxygen in liquid oxygen storage tank is through the liquid oxygen pump pressure-raising, through in press storage tank to regulate pressure, vaporizer to vaporize after, the outlet of oxygen compressor enters conversion section.
The oxygen of the described vaporizer vaporization of technique of the present invention is 0.02～0.04MPa to the pressure of oxygen compressor entrance, and oxygen compressor to the pressure of conversion section is 2.3～2.6MPa.
The beneficial effect that adopts technique scheme to produce is: the present invention is directed to amount of oxygen and can't meet the conversion process needs, methane conversion is low, the problem that the restriction methanol output improves is improved, by the research and probe of the characteristic to current preparing methanol from coke oven gas technology converting coke oven gas and vaporization of liquid oxygen device, propose vaporization of liquid oxygen technique is improved to the method that improves oxygen output.The present invention, by the vaporization of liquid oxygen device, improves the oxygen-supplying amount to conversion section, improves the reburner temperature, strengthens the changing effect of methane, thereby improves methanol output.Main feature of the present invention is as follows: 1. in liquid oxygen storage tank, liquid oxygen fills into pipe network after vaporization, with space division system production oxygen mix, improves the conversion section amount of oxygen, sends into reburner firing chamber and CH
4Carry out partial oxidation reaction, improve the reburner fire box temperature, promote that methane transforms to carbon monoxide, improve methanol output; 2. when space division system or oxygen compressor parking, liquid oxygen in liquid oxygen storage tank can also pass through the liquid oxygen pump pressure-raising, by the liquid oxygen carburetor gasification, directly sends into pipe network, avoids causing the methanol production parking because of sky minute workshop section or oxygen compressor fault, continuing of guarantee producing carries out, and is enterprise's create beneficial result.3. the purity of vaporization oxygen is comparatively stable, can remain at 99.6%, and that space division system output oxygen purity floats is larger, can't maintain all the time 99.6%, and vaporization oxygen can effectively improve oxygen purity after producing oxygen mix with empty minute institute, is conducive to production and carries out.Through measuring and calculating, the inventive method is applied to coke-stove gas methyl alcohol system processed of 200,000 ton/years, but approximately 3000 tons of year increase yield of methanol year are created more than 130 ten thousand yuan of benefit Yue Keda.
The accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is flowage structure schematic diagram of the present invention.
Embodiment
Coke-stove gas methanol technics processed comprises desulfurization, conversion, synthetic, rectifying, the sky workshop section that grades; An empty minute workshop section is communicated with conversion section by oxygen compressor.The vaporization of liquid oxygen system of this coke-stove gas methanol technics processed includes liquid oxygen storage tank and vaporizer; Described liquid oxygen storage tank, vaporizer are communicated with by pipeline successively with the entrance of oxygen compressor.Pipeline between described liquid oxygen storage tank and vaporizer is parallel with the pipeline of liquid oxygen pump and middle pressure storage tank formation, and described vaporizer is communicated with the outlet of oxygen compressor.Described vaporizer preferably adopts water bath type vaporizer, better to control vapourizing temperature.Described middle pressure storage tank is preferably with self-supercharging device.
The technological process that the vaporization of liquid oxygen method of this coke-stove gas methanol technics processed is concrete is: (1) when the air compressor inflate quantity low, while causing space division system oxygen inflate quantity to hang down, the liquid oxygen in liquid oxygen storage tank enters conversion section with the oxygen that sky minute workshop section generates through oxygen compressor after the vaporizer vaporization;
(2), when space division system scram or long-term maintenance are stopped, the liquid oxygen in liquid oxygen storage tank is through the liquid oxygen pump pressure-raising, through in press storage tank to regulate pressure, vaporizer to vaporize after, the outlet of oxygen compressor enters conversion section.
The vaporizer of the vaporization of liquid oxygen method of this coke-stove gas methanol technics processed adopts the heating water bath mode to make the liquid oxygen intensification vaporization from liquid oxygen storage tank, by controlling the heating steam Throughput, make bath temperature remain on 50～60 ℃, by regulating vaporizer outlet valve aperture size, regulate vaporized oxygen tolerance.By regulating vaporizer inlet valve aperture size, make the vaporized oxygen atmospheric pressure that enters the oxygen compressor entrance remain on 0.02～0.04MPa left and right, by regulating liquid oxygen pump terminal valve and middle pressure tank inner pressure, make the vaporized oxygen atmospheric pressure that passes into the oxygen compressor outlet remain on 2.3～2.6MPa.Oxygen enters reburner and coke-stove gas mixed combustion heat release, because conversion of methane is heat absorption reaction (CH
4+ H
2O=CO+3H
2+ Q, CH
4+ CO
2=2CO+2H
2+ Q) improve amount of oxygen, can effectively improve the reburner fire box temperature, promote the carrying out of conversion of methane, improve methanol output.
The flowage structure schematic diagram of the vaporization of liquid oxygen system that Fig. 1 is this coke-stove gas methanol technics processed, its concrete technological process is: (1) injects fresh water by the vaporizer chuck, and pass into low pressure steam, make carburettor temperature reach 50 ℃～60 ℃, open the liquid oxygen storage tank outlet valve, liquid oxygen pump by-pass valve F1, middle pressure storage tank by-pass valve F2, and the vaporizer inlet valve, inject liquid oxygen to vaporizer.When the vaporizer internal pressure reaches 2～4KPa, open oxygen compressor inlet valve F3, fill into oxygen to system.
(2) when need directly fill into oxygen to the oxygen compressor outlet, cut-off valve F1, F2, open the liquid oxygen pump terminal valve, middle pressure storage tank inlet valve, start liquid oxygen pump and inject liquid oxygen to middle pressure storage tank, presses storage tank outlet regulating valve V1 in adjusting, adjusting enters vaporizer liquid oxygen amount, when the vaporizer internal pressure reaches 2.3～2.6MPa, open the vaporizer outlet valve, control and fill into amount of oxygen to system by modulating valve V2.
Concrete application examples: the coke-stove gas of Hebei coal chemical industry enterprises methanol technics processed, CH in synthetic gas while normally producing
4Content is 1.8%, and the reburner fire box temperature is 890 ℃, and CO content is 16.5%.After adopting this vaporization of liquid oxygen apparatus and method shown in Fig. 1, per hour to conversion section supplemental oxygen 1000NM
3, CH in synthetic gas
4Content is being down to below 1%, and the reburner fire box temperature rises to 920 ℃, and CO content is 18.2%, has effectively solved the low outlet of reburner bore temperature, and the problem that methane content is high, improved the content of effective component in the synthetic gas.
Claims (6)
1. the vaporization of liquid oxygen system of a coke-stove gas methanol technics processed, the sky minute workshop section in described coke-stove gas methanol technics processed is communicated with conversion section by oxygen compressor, and it is characterized in that: it includes liquid oxygen storage tank and vaporizer; Described liquid oxygen storage tank, vaporizer are communicated with by pipeline successively with the entrance of oxygen compressor.
2. the vaporization of liquid oxygen system of coke-stove gas according to claim 1 methanol technics processed, it is characterized in that: the pipeline between described liquid oxygen storage tank and vaporizer is parallel with the pipeline of liquid oxygen pump and middle pressure storage tank formation, and described vaporizer is communicated with the outlet of oxygen compressor.
3. the vaporization of liquid oxygen system of coke-stove gas according to claim 1 and 2 methanol technics processed, it is characterized in that: described vaporizer is water bath type vaporizer.
4. the vaporization of liquid oxygen system of coke-stove gas according to claim 1 and 2 methanol technics processed, it is characterized in that: described middle pressure storage tank is with self-supercharging device.
5. the vaporization of liquid oxygen technique of a coke-stove gas methanol technics processed, adopt the vaporization of liquid oxygen system of coke-stove gas claimed in claim 2 methanol technics processed, it is characterized in that: (1), when space division system oxygen inflate quantity is low, the liquid oxygen in liquid oxygen storage tank enters conversion section with the oxygen that sky minute workshop section generates through oxygen compressor after the vaporizer vaporization;
(2), when space division system scram or long-term maintenance are stopped, the liquid oxygen in liquid oxygen storage tank is through the liquid oxygen pump pressure-raising, through in press storage tank to regulate pressure, vaporizer to vaporize after, the outlet of oxygen compressor enters conversion section.
6. the vaporization of liquid oxygen technique of coke-stove gas according to claim 5 methanol technics processed is characterized in that: the oxygen of described vaporizer vaporization is 0.02～0.04MPa to the pressure of oxygen compressor entrance, and oxygen compressor to the pressure of conversion section is 2.3～2.6MPa.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105546340A (en) * | 2015-12-10 | 2016-05-04 | 马鞍山钢铁股份有限公司 | Method and device for preventing moisture leakage of air separation vaporization system |
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| CN101244805A (en) * | 2008-03-13 | 2008-08-20 | 四川天一科技股份有限公司 | Method for producing methanol synthesis gas by oven gas non-catalytic pure oxygen-steam conversion |
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| WO2013037444A1 (en) * | 2011-09-15 | 2013-03-21 | Linde Aktiengesellschaft | Method for obtaining olefins from furnace gases of steel works |
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2013
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57122025A (en) * | 1981-01-22 | 1982-07-29 | Nippon Steel Corp | Utilizing method of surplus gas |
| CN101112970A (en) * | 2007-07-04 | 2008-01-30 | 山西科灵催化净化技术发展公司 | Technical method for preparing menthol synthetic gas by coke oven gas conversion without catalytic oxidation |
| CN101244805A (en) * | 2008-03-13 | 2008-08-20 | 四川天一科技股份有限公司 | Method for producing methanol synthesis gas by oven gas non-catalytic pure oxygen-steam conversion |
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| CN202188302U (en) * | 2011-06-29 | 2012-04-11 | 济源市金利冶炼有限责任公司 | Loxygen recovery and reuse system for space division machine |
| WO2013037444A1 (en) * | 2011-09-15 | 2013-03-21 | Linde Aktiengesellschaft | Method for obtaining olefins from furnace gases of steel works |
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Cited By (1)
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| CN105546340A (en) * | 2015-12-10 | 2016-05-04 | 马鞍山钢铁股份有限公司 | Method and device for preventing moisture leakage of air separation vaporization system |
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