CN104327895A - System and method for controlling hydrogen-carbon ratio - Google Patents
System and method for controlling hydrogen-carbon ratio Download PDFInfo
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- CN104327895A CN104327895A CN201410643639.1A CN201410643639A CN104327895A CN 104327895 A CN104327895 A CN 104327895A CN 201410643639 A CN201410643639 A CN 201410643639A CN 104327895 A CN104327895 A CN 104327895A
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Abstract
The invention provides a system and method for controlling a hydrogen-carbon ratio in a process of synthesizing natural gas. The system comprises a large-scale or mixed gas methanation reactor, a supplemental methanation reactor, a CO-rich gas inlet pipeline, a H2-rich gas inlet pipeline, a first regulating valve, a second regulating valve and a main pipeline, wherein the large-scale or mixed gas methanation reactor is connected with the supplemental methanation reactor by virtue of the main pipeline, and the CO-rich gas inlet pipeline and the H2-rich gas inlet pipeline are arranged in parallel and crossed with the main pipeline; the first regulating valve is positioned on the CO-rich gas inlet pipeline; the second regulating valve is positioned on the H2-rich gas inlet pipeline. The system for controlling the hydrogen-carbon ratio has the beneficial effects of simple structure and precise control. The method comprises the following steps: mixing the reaction gas from the large-scale or mixed gas methanation reactor with the rich Co and the rich H2 which are regulated by virtue of the first regulating valve or the second regulating valve, and then, introducing the gas mixture to the supplemental methanation reactor. The method disclosed by the invention has the effects of being simple, convenient and quick to operate.
Description
Technical field
The present invention relates to synthetic natural gas field, in particular to a kind of hydrogen-carbon ratio Controlling System in a kind of synthetic natural gas technique and control method.
Background technology
Sweet natural gas, be a kind of multi-component mixed gaseous fossil oil, main component is alkane, and wherein methane accounts for the overwhelming majority, separately has a small amount of ethane, propane and butane.It is mainly present in oil field, gas field, coal seam and shale bed.Produce without waste residue, waste water after combustion of natural gas, compare coal, oil equal energy source has the advantages such as use safety, calorific value are high, clean.Sweet natural gas can be divided into again associated gas and unassociated gas two kinds.
Sweet natural gas refers to the naturally occurring tangential gas of occurring in nature, comprises the gas (comprising oil field gas, reservoir gas, gas of mud volcano, coal-seam gas and biological generation gas etc.) that in atmospheric sphere, hydrosphere and litre geosphere, various natural process is formed.And the definition of general for a long time " Sweet natural gas " of people, be define from the narrow sense of energy point of view, refer to the natural mixture containing hydro carbons in stratum and non-hydrocarbon gases.In Petroleum geology, be often referred to oil field gas and reservoir gas.Its composition based on hydro carbons, and contains non-hydrocarbon gas.Sweet natural gas is contained in underground porous gap rock stratum, comprises oil field gas, reservoir gas, coal-seam gas, gas of mud volcano and biological generation gas etc., also has a small amount of for coal seam.It is high-grade fuel and industrial chemicals.Sweet natural gas main application makes fuel, can manufacture carbon black, pharmaceutical chemicals and liquefied petroleum gas (LPG), and the propane produced by Sweet natural gas, butane are the important source material of modern industry.Sweet natural gas is primarily of gaseous state low molecular hydrocarbon and non-hydrocarbon gas mixing composition.
Sweet natural gas main component alkane, wherein methane accounts for the overwhelming majority, separately has a small amount of ethane, propane and butane, generally has the rare gas of hydrogen sulfide, carbonic acid gas, nitrogen and aqueous vapor and a small amount of carbon monoxide and trace in addition, as helium and argon etc.Sweet natural gas, before delivering to final user, for helping leak detection, also adds smell to Sweet natural gas with mercaptan, tetramethylene sulfide etc.
Along with the demand that people's living standard improves and industry increases day by day fast, increasing to the demand of Sweet natural gas, there is the situation that supply falls short of demand in a long time.And methanation process synthetic natural gas becomes the main flow direction of this field development gradually.
Methanation process, refers to CO, CO in synthetic gas
2and H
2under the effect of certain temperature, pressure and catalyzer, carry out the process that chemical reaction generates methane.Keep hydrogen micro-excessive in reaction, CO transformation efficiency can be made to reach 100%, by methane content in the Sweet natural gas that methanation is standby high (more than 95%).Current methanation process is mostly divided into two stages: i.e. a large amount of methanation (or distribution methanation) and supplementary methanation.Major part methane generated in the first stage (being divided into 2-3 level), control well temperature of reaction not overtemperature be technique emphasis, current business-like production technique controls temperature of reaction by circulation gas and is called a large amount of methanation, also have a kind of mode to be control temperature of reaction by unstripped gas distribution step by step (controlling the amount of wherein a kind of raw material), be called distribution methanation.Subordinate phase supplements methanation mainly in order to realize full methanation, balances cooling to realize by (being divided into 2-3 level) step by step.But no matter be a large amount of methanation or distribution methanation, because tolerance is larger, be difficult to the accurate proportioning of hydrogen carbon in realization response unstripped gas, H:Cmoleratio only carried out analyzing and regulating before unstripped gas enters a large amount of methanation stage, and due to higher to CO content requirement in Sweet natural gas, CO is poisonous, its content height can be dangerous, usually adopt hydrogen richness to be a bit larger tham the mode of stoichiometric ratio in current suitability for industrialized production, synthetic natural gas requires CO < 0.01% (v), H
2< 4% (v).But, in fact CO, CO in existing process feed gas
2and H
2be difficult to enter reactor with optimum proportioning, cause synthetic natural gas product H
2content easily exceeds standard, and causes the calorific value of synthetic natural gas to reduce.
Therefore, how realizing the accurate control of hydrogen-carbon ratio in unstripped gas is main research direction.
Summary of the invention
The first object of the present invention is to provide a kind of hydrogen-carbon ratio Controlling System, described hydrogen-carbon ratio Controlling System have structure simple, control the advantages such as accurate.
The second object of the present invention is to provide a kind of method adopting above-mentioned hydrogen-carbon ratio Controlling System to control hydrogen-carbon ratio, and the method has the advantages such as easy to operate, quick.
In order to realize above-mentioned purpose of the present invention, spy by the following technical solutions:
The invention provides a kind of hydrogen-carbon ratio Controlling System, comprise a large amount of or distribution methanator, supplement methanator, rich CO intake ducting, rich H
2intake ducting, the first variable valve, the second variable valve and total pipeline;
A large amount of or distribution methanator is connected with supplementary methanator by total pipeline, rich CO intake ducting and rich H
2intake ducting is arranged in parallel and cross with total pipeline;
First variable valve is positioned on rich CO intake ducting, and the second variable valve is positioned at rich H
2on intake ducting.
Preferably, hydrogen-carbon ratio Controlling System is also included in line analysis device, and total pipeline is provided with on-line analysis device near the one end supplementing methanator.
Preferably, the first variable valve and described second variable valve are pneumatic adjusting valve.
Preferably, the first variable valve and the second variable valve are at least two or more.
Preferably, the valve body of the first variable valve and described second variable valve is the wherein one in stopping valve, gate valve, angle valve, butterfly valve and ball valve.
Preferably, the front and back of the first variable valve are respectively provided with a stopping valve, and the front and back of the second variable valve are respectively provided with a stopping valve.
Preferably, the first by-pass valve, the second by-pass valve, the first bypass duct and the second bypass duct is also comprised;
First by-pass valve is positioned on the first bypass duct, and the first bypass duct and two ends of first bypass duct in parallel with rich CO intake ducting are connected with the outside pipeline of the both sides stopping valve on rich CO intake ducting respectively;
Second by-pass valve is positioned on the second bypass duct, the second bypass duct and rich H
2in parallel and the two ends of the second bypass duct of intake ducting respectively with rich H
2the outside pipeline of the both sides stopping valve on intake ducting connects.
Preferably, rich CO voltage-stabilizing system and rich H is also comprised
2voltage-stabilizing system, rich CO voltage-stabilizing system connects one end of rich CO intake ducting, rich H
2voltage-stabilizing system connects rich H
2one end of intake ducting.
The hydrogen-carbon ratio Controlling System that the embodiment of the present invention provides is passed through at rich CO intake ducting and rich H
2intake ducting is arranged variable valve and reach accurate control to realize micro-adjustment operation, can realize like this CO and rich H rich during raw material air inlet
2the accurate control of proportioning, and control in time, to make unstripped gas CO, CO
2and H
2supplementary methanator is entered, the gas product better quality of synthesis with optimum proportioning.
The embodiment of the present invention additionally provides the method adopting hydrogen-carbon ratio Controlling System to control hydrogen-carbon ratio, by from a large amount of or distribution methanator reaction gas out with regulated by the first variable valve or the second variable valve after rich CO and rich H
2hydrogen carbon proportioning enters supplementary methanator after jointly converging after regulating.
Preferably, rich H
2be the process gas that H:Cmoleratio is greater than 4, rich CO refers to the process gas that H:Cmoleratio is less than 2.5.
Wherein, the formula that H:Cmoleratio is concrete refers to (H
2-CO
2)/(CO+CO
2) mol ratio.
The employing hydrogen-carbon ratio Controlling System that the embodiment of the present invention provides controls the method for hydrogen-carbon ratio, and control method is simple, quick, and controls in time, to make unstripped gas CO and H
2supplementary methanator is entered, the gas product better quality of synthesis with optimum proportioning.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below.
Fig. 1 is the structural representation of the hydrogen-carbon ratio Controlling System of the embodiment of the present invention;
Fig. 2 is the structural representation of another embodiment of the present invention volume hydrogen-carbon ratio Controlling System.
Reference numeral:
1 a large amount of or distribution methanator; 2 supplement methanator;
3 rich CO intake ductings; 4 rich H
2intake ducting;
5 first variable valve; 6 second variable valve;
7 total pipelines; 8 on-line analysis devices;
9 first bypass ducts; 10 second bypass ducts;
11 first by-pass valves; 12 second by-pass valves;
13 rich CO voltage-stabilizing systems; 14 rich H
2voltage-stabilizing system.
Embodiment
Be clearly and completely described technical scheme of the present invention below in conjunction with accompanying drawing, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In describing the invention, it should be noted that, orientation or the position relationship of the instruction such as term " " center ", " on ", D score, "left", "right", " vertically ", " level ", " interior ", " outward " they be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second ", " the 3rd " only for describing object, and can not be interpreted as instruction or hint relative importance.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, particular case above-mentioned term concrete meaning in the present invention can be understood.
The invention provides a kind of hydrogen-carbon ratio Controlling System, as shown in Figure 1, comprise a large amount of or distribution methanator 1, supplement methanator 2, rich CO intake ducting 3, rich H
2intake ducting 4, first variable valve 5, second variable valve 6 and total pipeline 7;
A large amount of or distribution methanator is connected with supplementary methanator 2 by total pipeline 7, rich CO intake ducting 3 and rich H
2intake ducting 4 is arranged in parallel and cross with total pipeline 7;
First variable valve 5 is positioned on rich CO intake ducting 3, and the second variable valve 6 is positioned at rich H
2on intake ducting 4.
The hydrogen-carbon ratio Controlling System that the embodiment of the present invention provides is passed through at rich CO intake ducting 3 and rich H
2the variable valve that intake ducting 4 is arranged, to realize micro-adjustment operation, can realize like this to CO and rich H rich during feedstock
2accurate control, and control in time, to make unstripped gas CO and H
2supplementary methanator is entered, the gas product better quality of synthesis with optimum proportioning.
Preferably, as shown in Figure 2, hydrogen-carbon ratio Controlling System is also included in line analysis device 8, and total pipeline 7 is provided with on-line analysis device 8 near the one end supplementing methanator 2.On-line analysis device can analyze H in surveyed processing medium automatically in real time
2, CO and CO
2molar content, and can calculate hydrogen carbon mole, when this mol ratio departs from reaction theory value, the rich CO by correspondence finely tunes pipeline or rich H simultaneously
2fine setting pipeline carries out trace adjustment to it.The concrete structure of on-line analysis device is that sensor is connected with processing module, and processing module is preferably DCS system or PLC system, and the data transmitted by sensor are in the enterprising row relax analysis of processing module.
Preferably, the first variable valve 5 is pneumatic adjusting valve with described second variable valve 6, and pneumatic adjusting valve is relatively more accurate, can realize controlling more accurately to gas flow.
Preferably, the first variable valve 5 and the second variable valve 6 are at least two or more, in order to realize regulating more accurately, also on supplementary methanator outlet line at different levels, can arrange variable valve respectively.
Preferably, the valve body of the first variable valve and described second variable valve is the wherein one in stopping valve, gate valve, angle valve, butterfly valve and ball valve.
Preferably, the front and back of the first variable valve are respectively provided with a stopping valve, the front and back of the second variable valve are respectively provided with a stopping valve, are conveniently pulled down by variable valve to overhaul when variable valve goes wrong, and preferably respectively arrange a stopping valve easy access dismounting in the front and back of variable valve.
Preferably, the first by-pass valve 11, second by-pass valve 12, first bypass duct 9 and the second bypass duct 10 is also comprised;
First by-pass valve 11 is positioned on the first bypass duct 9, and the first bypass duct 9 and two ends of first bypass duct in parallel with rich CO intake ducting are connected with the outside pipeline of the both sides stopping valve on rich CO intake ducting respectively;
Second by-pass valve 12 is positioned on the second bypass duct 10, the second bypass duct 10 and rich H
2in parallel and the two ends of the second bypass duct of intake ducting respectively with rich H
2the outside pipeline of the both sides stopping valve on intake ducting connects.
When the first variable valve and the second variable valve go wrong need repairing time, in order to not affect normal technical process, the first bypass duct and the second bypass duct can be accessed, temporarily replace work by the first by-pass valve on bypass duct and the second by-pass valve, to ensure the normal operation of producing.
Preferably, rich CO voltage-stabilizing system 13 and rich H is also comprised
2voltage-stabilizing system 14, rich CO voltage-stabilizing system connects one end of rich CO intake ducting, rich H
2voltage-stabilizing system connects rich H
2one end of intake ducting, in order to make raw material air inlet more stable, pressure is more steady, preferably all arranges a voltage-stabilizing system in the front end of raw material air inlet.
The embodiment of the present invention additionally provides the method adopting hydrogen-carbon ratio Controlling System to control hydrogen-carbon ratio, by from a large amount of or distribution methanator reaction gas out with regulated by the first variable valve or the second variable valve after rich CO and rich H
2jointly converge after distribution and enter supplementary methanator.
Employing hydrogen-carbon ratio Controlling System that the embodiment of the present invention provides controls the method for hydrogen-carbon ratio, and control method is simple, quick, and controls in time, and when specifically regulating, two variable valve had better not action simultaneously, fixing rich CO or rich H
2air input, by regulating the first variable valve or the second variable valve, make unstripped gas CO and H
2supplementary methanator is entered, the gas product better quality of synthesis with optimum proportioning.
Preferably, rich H
2be the process gas that H:Cmoleratio is greater than 4, rich CO refers to the process gas that H:Cmoleratio is less than 2.5, generally H in concrete reaction process
2excessive, so at the rich H of control
2during with rich CO charging, had better not too much CO be contained, prevent reaction violent, produce a large amount of reaction heat and cause fluctuation unstable, therefore rich H
2after mixing with rich CO charging, H:Cmoleratio controls at about 3:1.
The concrete technology flow process of the hydrogen-carbon ratio Controlling System of the embodiment of the present invention is as follows:
By H
2and the display numerical value of CO on-line analysis device is known enters rich H in the processing medium of supplementary methanator
2and the H:Cmoleratio of rich CO, when H:Cmoleratio departs from reaction theory value, by rich H
2or first variable valve of rich CO or the second variable valve carry out trace adjustment, fix one of them air input, regulate another one air input, to ensure H in supplementary methanation
2, CO and CO
2sufficient chemical reaction can be carried out with optimum molar proportioning, improve the content of methane in product Sweet natural gas.
The embodiment of the present invention can enter H in the process gas in supplementary methanation stage by fine adjustment
2, CO and CO
2content, make H in the supplementary methanation stage
2, CO and CO
2sufficient chemical reaction can be carried out with optimum molar proportioning, reduce H in synthetic natural gas
2, CO and CO
2content, improve the content of methane and the calorific value of synthetic natural gas.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a hydrogen-carbon ratio Controlling System, is characterized in that, comprises a large amount of or distribution methanator, supplements methanator, rich CO intake ducting, rich H
2intake ducting, the first variable valve, the second variable valve and total pipeline;
Described a large amount of or distribution methanator is connected with described supplementary methanator by total pipeline, described rich CO intake ducting and described rich H
2intake ducting is arranged in parallel and cross with described total pipeline;
Described first variable valve is positioned on described rich CO intake ducting, and described second variable valve is positioned at described rich H
2on intake ducting.
2. hydrogen-carbon ratio Controlling System according to claim 1, is characterized in that, is also included in line analysis device, and the one end near described supplementary methanator on described total pipeline is provided with described on-line analysis device.
3. hydrogen-carbon ratio Controlling System according to claim 1, is characterized in that, described first variable valve and described second variable valve are pneumatic adjusting valve.
4. hydrogen-carbon ratio Controlling System according to claim 3, is characterized in that, described first variable valve and described second variable valve are at least two or more.
5. hydrogen-carbon ratio Controlling System according to claim 3, is characterized in that, the valve body of described first variable valve and described second variable valve is the wherein one in stopping valve, gate valve, angle valve, butterfly valve and ball valve.
6. hydrogen-carbon ratio Controlling System according to claim 5, is characterized in that, the front and back of described first variable valve are respectively provided with a stopping valve, and the front and back of described second variable valve are respectively provided with a stopping valve.
7. hydrogen-carbon ratio Controlling System according to claim 6, is characterized in that, also comprises the first by-pass valve, the second by-pass valve, the first bypass duct and the second bypass duct;
Described first by-pass valve is positioned on described first bypass duct, and described first bypass duct and the two ends of described first bypass duct in parallel with described rich CO intake ducting are connected with the outside pipeline of stopping valve described in the both sides on described rich CO intake ducting respectively;
Described second by-pass valve is positioned on described second bypass duct, described second bypass duct and described rich H
2in parallel and the two ends of described second bypass duct of intake ducting respectively with described rich H
2the outside pipeline of stopping valve described in the both sides on intake ducting connects.
8. hydrogen-carbon ratio Controlling System according to claim 1, is characterized in that, also comprises rich CO voltage-stabilizing system and rich H
2voltage-stabilizing system, described rich CO voltage-stabilizing system connects one end of described rich CO intake ducting, described rich H
2voltage-stabilizing system connects described rich H
2one end of intake ducting.
9. adopt the hydrogen-carbon ratio Controlling System described in any one of claim 1-8 to control the method for hydrogen-carbon ratio, it is characterized in that, by from described a large amount of or distribution methanator reaction gas out with regulated by described first variable valve or described second variable valve after rich CO and rich H
2jointly converge after distribution and enter described supplementary methanator.
10. the method for control hydrogen-carbon ratio according to claim 9, is characterized in that, described rich H
2be the process gas that H:Cmoleratio is greater than 4, described rich CO refers to the process gas that H:Cmoleratio is less than 2.5.
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| CN201410643639.1A CN104327895B (en) | 2014-11-10 | 2014-11-10 | A kind of hydrogen-carbon ratio control system and control method |
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| CN104327895B CN104327895B (en) | 2016-09-21 |
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| CN110684571A (en) * | 2019-10-13 | 2020-01-14 | 内蒙古恒坤化工有限公司 | Method for recycling tail gas generated in process of producing liquefied natural gas by coke oven gas |
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