CN104593110A - Methanation process for producing natural gas from coke oven exhaust gas - Google Patents
Methanation process for producing natural gas from coke oven exhaust gas Download PDFInfo
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- CN104593110A CN104593110A CN201510056587.2A CN201510056587A CN104593110A CN 104593110 A CN104593110 A CN 104593110A CN 201510056587 A CN201510056587 A CN 201510056587A CN 104593110 A CN104593110 A CN 104593110A
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Abstract
The invention relates to a methanation process for producing natural gas from coke oven exhaust gas. The methanation process is characterized in that raw coal is burned in the coke oven to produce exhaust gas which is subjected to a methanation process to prepare qualified natural gas. The methanation process comprises exhaust gas pretreatment, a methanation first-section reaction, a methanation second-section reaction and a methanation three-section reaction; during the methanation reaction process, a certain amount of process steam and recycle gas are added into the raw material, only appropriate steam-gas ratio can ensure that the methanation reaction is smoothly performed, bed layers of a methanation reactor can be maintained at an allowable temperature range and the reaction heat can be timely and effectively removed and the adverse influence caused by catalyst carbon deposition is avoided.
Description
Technical field
The present invention relates to chemical industry field, specifically a kind of methanation process of coke oven tail gas preparing natural gas.
Background technology
Methanation technology is that 20 century 70s start industrialized test, and test demonstrates gas methanation and can produce qualified synthetic natural gas.CO transformation efficiency can 100%, CO
2transformation efficiency can reach 98%, and methane can reach 95%, and low heat value reaches 8300Kcal/Nm3.Big plain in u.s.a gasification synthetic natural gas plant, went into operation in 1984, utilizes crushed coal pressure gasifying, purification coal gas by catalyzer at 2.4 ~ 6MPa, at 300 ~ 700 DEG C, by H
2, CO synthetic natural gas technology; It is that coal gas large scale business chemical plant by methanation synthetic natural gas after purification is produced in the pressurization static bed gasification of First broken coal in the world.But, although coal in China output ranks first in the world, utilization ratio is but very low, and energy-saving and emission-reduction pressure is very large, improve coal transformation efficiency and purifying be the major issue that must solve now.Although existing Sweet natural gas synthetic technology flow process comparative maturity comparatively speaking, but, in methanation process process, control and the maintenance technology of the temperature permitted in methanator bed are also immature, usually cause the natural gas conditioning degree produced impure, so the purity improving Sweet natural gas is very important.Realize control and the maintenance of the temperature permitted in methanator bed, the Sweet natural gas high purity realizing producing is the technical problem that the present invention wants emphasis to solve.
Summary of the invention
The present invention is directed above-mentioned prior art Problems existing, propose a kind of methanation process of coke oven tail gas preparing natural gas, the technical problem to be solved in the present invention is the significant temp controlling to be beneficial to Sweet natural gas building-up reactions, enter your minimizing catalyzer and promote that a large amount of carbon distribution produced is carried out in reaction, obtain the methane that purity is higher.
Object of the present invention realizes by following technical proposal:
1. the methanation process of a coke oven tail gas preparing natural gas, it is characterized in that, raw coal is after coke oven combustion, produce tail gas, tail gas makes sales-quality gas by methanation process, described methanation process comprises tail gas pre-treatment, methanation one section reaction, methanation second-stage reaction and methanation three sections reaction, specifically comprises the steps:
The circulation gas that first gas in a, coke oven come in vapour gas mixing tank and cycle compressor supercharging mixes;
B, mixed gas heat through one section of preheater;
Mixed gas after c, heating mixes with the process steam exported in steam water trap;
D, when mixed gas temperature rises to 205 degree ~ 300 degree, enter first stage reactor and carry out methanation reaction;
The gas that e, first stage reactor export enters second stage reactor, enters methanation second-stage reaction;
The gas that f, second stage reactor export enters three sections of reactors, enters methanation three sections reaction;
G, export methane gass from three sections of reactors;
Particularly, the mixed gas in described coke oven has H
2, CO, N
2, CH
4, CnHm Multiple components.
Particularly, described methanation one section reaction, methanation second-stage reaction, methanation three sections reaction all occur in methanator.
Particularly, in methanation one section reaction and methanation second-stage reaction, when normal running, steam-to-gas ratio H is controlled
2o/ unstripped gas is 0.1-0.5, can increase steam-to-gas ratio H when the methanator overtemperature that other reasons causes
2o/ unstripped gas is 0.5 ~ 0.7.
Particularly, described methanator import and export respectively increases a pressure unit, a pressure regulator valve.
Beneficial effect of the present invention is, how to keep methanator bed in the temperature range that can be permitted and shifts out reaction heat timely and effectively, and the detrimentally affect how avoiding catalyst carbon deposition to cause.Solve these 2 key to the issues to be just effectively to control to the addition of a certain amount of process steam and circulation gas in raw material, only in this way suitable steam-to-gas ratio guarantee methanation reaction carries out smoothly.
Below in conjunction with the drawings and specific embodiments, the invention will be further described simultaneously.
Accompanying drawing explanation
Fig. 1: coke oven tail gas preparing natural gas roughly schema
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.
According to the optimal way of the methanation process of a kind of coke oven tail gas preparing natural gas of the present invention, will 1 elaborate by reference to the accompanying drawings in this article.First, raw coal, in coke oven combustion, produces mixed tail gas after burning, and main component is H
2, CO, N
2, CH
4, the Multiple components such as CnHm, these mixed gass, by a series of purification, purification, methanation, can produce clean energy-methane.First, pre-treatment is carried out to mixed tail gas, mixes up temperature of reaction, carry out the preparation work of methanation reaction, enter methanation reaction afterwards.First what carry out is methanation one section reaction, after methanation one section reaction, gas inputs in methanation second stage reactor, carry out methanation second-stage reaction, then will input in methanation three sections of reactors from the gas in methanation second stage reactor, carry out methanation three sections reaction, finally in methanation three sections of reactors, export methane gas.In methanation reaction process, it is essential and will add a certain amount of process steam and circulation gas in the feed, only in this way suitable steam-to-gas ratio guarantee methanation reaction carries out smoothly, could keep methanator bed in the temperature range that can be permitted and shift out reaction heat timely and effectively, avoiding the detrimentally affect that catalyst carbon deposition causes.
It is more than the description to the preferred embodiment of the present invention.Be that the object illustrated provides in description above, be not intended to exhaustive or limit the invention to disclosed precise forms.Other amendment, change and change are in the cards in the above teachings, are also clear for those skilled in the art, and can use in the Design and manufacture of other embodiment according to the present invention and not depart from the spirit and scope of the invention.Object is not only limited by this specification sheets in scope of the present invention, but only by a part and/or any application requiring right of priority based on the application of the application, and/or the claim of any patent of authorizing on this application basis limits.
Claims (5)
1. the methanation process of a coke oven tail gas preparing natural gas, it is characterized in that, raw coal is after coke oven combustion, produce tail gas, tail gas makes sales-quality gas by methanation process, described methanation process comprises tail gas pre-treatment, methanation one section reaction, methanation second-stage reaction and methanation three sections reaction, specifically comprises the steps:
The circulation gas that first gas in a, coke oven come in vapour gas mixing tank and cycle compressor supercharging mixes;
B, mixed gas heat through one section of preheater;
Mixed gas after c, heating mixes with the process steam exported in steam water trap;
D, when mixed gas temperature rises to 205 degree ~ 300 degree, enter first stage reactor and carry out methanation reaction;
The gas that e, first stage reactor export enters second stage reactor, enters methanation second-stage reaction;
The gas that f, second stage reactor export enters three sections of reactors, enters methanation three sections reaction;
G, export methane gass from three sections of reactors.
2. the methanation process of a kind of coke oven tail gas preparing natural gas according to claim 1, it is characterized in that, the mixed gas in described coke oven has H
2, CO, N
2, CH
4, CnHm Multiple components.
3. the methanation process of a kind of coke oven tail gas preparing natural gas according to claim 1, is characterized in that, described methanation one section reaction, methanation second-stage reaction, methanation three sections reaction all occur in methanator.
4. the methanation process of a kind of coke oven tail gas preparing natural gas according to claim 1, is characterized in that, in methanation one section reaction and methanation second-stage reaction, when normal running, controls steam-to-gas ratio H
2o/ unstripped gas is 0.1-0.5, can increase steam-to-gas ratio H when the methanator overtemperature that other reasons causes
2o/ unstripped gas is 0.5 ~ 0.7.
5. the methanation process of a kind of coke oven tail gas preparing natural gas according to claim 1, is characterized in that, described methanator import and export respectively increases a pressure unit, a pressure regulator valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510056587.2A CN104593110A (en) | 2015-02-04 | 2015-02-04 | Methanation process for producing natural gas from coke oven exhaust gas |
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| CN201510056587.2A CN104593110A (en) | 2015-02-04 | 2015-02-04 | Methanation process for producing natural gas from coke oven exhaust gas |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010132551A2 (en) * | 2009-05-13 | 2010-11-18 | Greatpoint Energy, Inc. | Processes for hydromethanation of a carbonaceous feedstock |
| CN102776041A (en) * | 2012-07-30 | 2012-11-14 | 西南化工研究设计院有限公司 | Multilevel methanation preparation method of natural gas from semi-coke exhaust |
| CN102776043A (en) * | 2012-07-30 | 2012-11-14 | 西南化工研究设计院有限公司 | Circulating method for preparing natural gas by multi-stage methanation of semi-coke tail gas |
| CN103695058A (en) * | 2013-12-19 | 2014-04-02 | 中国海洋石油总公司 | Novel methanation reaction process for preparing synthetic natural gas |
-
2015
- 2015-02-04 CN CN201510056587.2A patent/CN104593110A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010132551A2 (en) * | 2009-05-13 | 2010-11-18 | Greatpoint Energy, Inc. | Processes for hydromethanation of a carbonaceous feedstock |
| CN102776041A (en) * | 2012-07-30 | 2012-11-14 | 西南化工研究设计院有限公司 | Multilevel methanation preparation method of natural gas from semi-coke exhaust |
| CN102776043A (en) * | 2012-07-30 | 2012-11-14 | 西南化工研究设计院有限公司 | Circulating method for preparing natural gas by multi-stage methanation of semi-coke tail gas |
| CN103695058A (en) * | 2013-12-19 | 2014-04-02 | 中国海洋石油总公司 | Novel methanation reaction process for preparing synthetic natural gas |
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Application publication date: 20150506 |