CN109796295A - A kind of natural gas pyrolysis acetylene concentration system and its technique - Google Patents
A kind of natural gas pyrolysis acetylene concentration system and its technique Download PDFInfo
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- CN109796295A CN109796295A CN201811616920.0A CN201811616920A CN109796295A CN 109796295 A CN109796295 A CN 109796295A CN 201811616920 A CN201811616920 A CN 201811616920A CN 109796295 A CN109796295 A CN 109796295A
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- acetylene
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- stripper
- potassium carbonate
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Abstract
The present invention provides a kind of natural gas pyrolysis acetylene concentration system, which includes prewashing tower, leads and wash tower, acetylene stripper, tail gas washing tower, counter-current stripper and solvent processing unit；Solvent processing unit includes potassium carbonate adding set, heating power desorber, vacuum column and advanced alkynes stripper；Prewashing tower washes tower with master and acetylene stripper is separately connected；Master washes tower and connect with tail gas washing tower and counter-current stripper；Counter-current stripper exports circulating air and acetylene gas.Natural gas pyrolysis acetylene concentration system provided by the invention effectively reduces the etching problem of the internal system of concentration unit, the blocking of system is alleviated, device runs smoothly, and reduces the consumption of nmp solvent, in the cleaning and maintenance period for extending equipment, thereby reduce production cost.
Description
Technical field
This patent disclosure relates generally to gas chemical industry fields, more particularly, to a kind of natural gas pyrolysis acetylene concentration system
System.
Background technique
Natural gas pyrolysis acetylene technique is the important process in gas chemical industry field, and the technology utilization natural gas is in height
The lower cracking of temperature, generates cracking gas, then with after solvent absorption, parsing, obtaining the higher acetylene gas of purity and acetylene tail gas；With it
He compares acetylene production process, saves energy, is conducive to environmental protection.
Cracking gas is separated into three acetylene gas, synthesis gas and advanced alkynes gas parts by concentration unit, which is also
The highest part of energy consumption in gas acetylene technique.In natural gas pyrolysis product other than the acetylene comprising volume fraction 6%, also
Contain the objects such as a large amount of synthesis gas and a small amount of carbon black, methane, ethylene, methyl alkynes, allene, ethylene acetylene and diacetylene
Matter, wherein carbon black enters carbon black processing system with process water, and the separation of remaining component is in acetylene concentration technique in cracking gas
It carries out.Physicochemical characteristics based on acetylene, using NMP as solvent in extracting and concentrating technology, by synthesis gas, second in compression system
Alkene, methane mixture are separated from cracking gas, are desorbed most of acetylene in normal pressure system, in vacuum system
Realize further desorption, the desorption of advanced alkynes and the regeneration of solvent of acetylene.
The higher alkynes such as methyl alkynes, allene, diacetylene and vinylacetylene reactivity present in cracking gas is high,
It is very easy to polymerization.Generally for the product acetylene gas for obtaining lower content higher hydrocarbon, need to increase the equipment such as prewashing tower.Molten
When agent regenerates, it is often necessary to which heated solvent could deviate from advanced alkynes under vacuum conditions.Acetylene and advanced alkynes are in weakly acidic item
Polymerization is very easy under part, advanced alkynes is the major reason to form polymer, and polymer is easy deposition, causes line clogging.
Moreover, generating one according to nmp solvent property it is found that NMP can be hydrolyzed when NMP is more than water content 50%, temperature 50 C
The kind very strong acid of corrosivity causes advanced alkynes scrubbing tower and solvent to mix the corrosion of liquid pipe.
Therefore, a kind of new cracking gas acetylene concentration system need to be provided, it is stifled to solve pipeline common in prior art
The case where plug and equipment corrosion.
Summary of the invention
The purpose of the present invention is to provide a kind of new cracking gas acetylene concentration systems, to solve to polymerize in prior art
Line clogging problem caused by the generation of object.
To achieve the goals above, the invention provides the following technical scheme:
A kind of natural gas pyrolysis acetylene concentration system, the system comprises prewashing tower, masters to wash tower, acetylene stripper, tail
Gas wash tower, counter-current stripper and solvent processing unit；
The solvent processing unit includes potassium carbonate adding set, heating power desorber, vacuum column and advanced alkynes stripper；Institute
It states prewashing tower and washes tower and acetylene vapour extraction column is separately connected with main；The master washes tower and tail gas washing tower and counter-current stripper connects
It connects；The counter-current stripper output circulating air and acetylene gas.
Preferably, the counter-current stripper is connect with the heating power desorber, is connected with potassium carbonate in the connection line
Add-on system；
The heating power desorber is connect with vacuum column；The vacuum column is connect with the advanced alkynes stripper；
The acetylene gas further desorbed in the vacuum column returns to counter-current stripper tower by heating power desorber
In.
Preferably, the tail gas washing tower is connect with condensate liquid input channel, exports synthesis gas.
Preferably, the acetylene vapour concentration tower is connect with the advanced alkynes stripper；The advanced alkynes stripper output is high
Grade alkynes gas, and carry out solvent and handle.
Preferably, the prewashing tower and main tower of washing are added with nmp solvent.
Preferably, the potassium carbonate adding set includes sequentially connected solution of potassium carbonate configured slot, NMP mixed liquor storage tank
And solvent pump.
Preferably, agitating device is equipped in the solution of potassium carbonate configured slot；The solution of potassium carbonate configured slot outer circulation
Equipped with potassium carbonate delivery pump.
Another object of the present invention is to provide a kind of natural gas pyrolysis acetylene concentration technique,
A kind of natural gas pyrolysis acetylene concentration technique, technique system provided by any of the above-described carry out.
Preferably, the step of technique is as follows:
(1) cracking gas enters prewashing tower, and nmp solvent is added in prewashing tower, after removing most of higher alkyne, is delivered to
Master washes tower；
(2) nmp solvent is added in Xiang Zhuxi tower, acetylene and synthesis gas is separated, synthesis gas enters tail gas washing tower
It is washed with condensate liquid, acetylene enriched solvent enters counter-current stripper；
(3) acetylene enriched solvent desorbs acetylene and circulating air in counter-current stripper, and surplus solution is sent to solvent processing
Unit；
(4) solution of potassium carbonate is added in surplus solution, after by heating power desorber, desorb a small amount of acetylene be back to it is inverse
Desorber is flowed, solution is input to vacuum column；
(5) the further desorption of acetylene is realized in vacuum column, acetylene gas is delivered to heating power desorber, remaining solution is then
It is delivered to advanced alkynes stripper；
(6) removing of advanced alkynes, and recycling design are carried out in advanced alkynes stripper.
The utility model has the advantages that
1, a kind of natural gas pyrolysis acetylene concentration device provided by the invention, is added to potassium carbonate, effectively in systems
Reduce the corrosion inside the device of concentration unit.
2, a kind of natural gas pyrolysis acetylene concentration device provided by the invention, the solution of potassium carbonate of addition inhibit polymerization
The generation of object alleviates the blocking of system.
3, a kind of natural gas pyrolysis acetylene concentration device provided by the invention, device run smoothly, and reduce nmp solvent
Consumption, extend the cleaning and maintenance period of equipment, thereby reduce production cost.
Detailed description of the invention
The schematic diagram of Fig. 1 acetylene concentration system provided by the invention
The schematic diagram of Fig. 2 potassium carbonate adding set provided by the invention
Wherein, 1: prewashing tower；2: master washes tower；3: counter-current stripper；4: heating power desorber；5: vacuum column；6: advanced alkynes vapour
Stripper；7: acetylene stripper；8: tail gas washing tower；9: potassium carbonate adding set；10: agitating device；11: solution of potassium carbonate configuration
Slot；12: potassium carbonate delivery pump；13: valve；14:NMP mixed liquor storage tank；15: solvent pump.
Specific embodiment
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, and reference label refers to the group in the present invention
Part, technology, realizing under appropriate circumstances so as to advantages and features of the invention can be easier to be understood.Following description is pair
The materialization of the claims in the present invention, and other specific implementations not clearly stated relevant to claim also belong to power
The range that benefit requires.
As shown in Figure 1, being the schematic diagram of acetylene concentration system provided by the invention.
A kind of natural gas pyrolysis acetylene concentration system, the system include prewashing tower 1, lead and wash tower 2, acetylene stripper 7, tail
Gas wash tower 8, adverse current Analytic Tower 3 and solvent processing unit；Solvent processing unit includes potassium carbonate adding set 9, heating power solution
Inhale tower 4, vacuum column 5 and advanced alkynes stripper 6；The prewashing tower 1 washes tower 2 with master and acetylene stripper 7 is separately connected；Master washes tower
2 connect with tail gas washing tower 8 and counter-current stripper 3；Adverse current Analytic Tower 3 exports circulating air and acetylene gas；
It joined potassium carbonate adding set 9 in natural gas pyrolysis acetylene concentration system, be added to potassium carbonate in systems,
Have adjusted the pH value of system, it is therefore prevented that the corrosion of system, and solution of potassium carbonate is not involved in the physical-chemical reaction of technique, and it will not
Technique is had an impact, ensure that the safety of device.
Adverse current Analytic Tower 3 is connect with heating power desorber 4, and potassium carbonate adding set 9 is connected in the connection line；Heating power
Analytic Tower 4 is connect with vacuum column 5；Vacuum column 5 is connect with the advanced alkynes stripper 6；It is further desorbed in vacuum column 5
Acetylene gas is returned in adverse current Analytic Tower 3 by heating power Analytic Tower 4；
Master washes the acetylene enriched solvent flowed out in tower 2 and desorbs acetylene gas and recyclegas in counter-current stripper 3, rear surplus
Remaining solution flows into heating power desorber 4, heating desorption is carried out to solution in heating power desorber 4, wherein the gas desorbed
Be back to adverse current Analytic Tower 3 from 4 upper end outlet of heating power desorber, do further vacuum desorption in vacuum column 5 again later, gas from
5 upper end opening of vacuum column, which is returned in heating power desorber 4, re-starts desorption.Acetylene enriched solvent desorbs in adverse current Analytic Tower 3
Later, it is desorbed by the repetition of heating power desorber 4 and vacuum column 5, the extraction of acetylene gas in the solution is more abundant.
Tail gas washing tower 8 is connect with condensate liquid input channel, exports synthesis gas；
Nmp solvent absorbs acetylene gas in main wash in tower 2, and residual gas inputs in tail gas washing tower 8, in washing tail gas
It is condensed in tower 8 by condensate liquid, exports synthesis gas.It has isolated in tail gas washing tower 8 present in cracking gas and has largely closed
At gas.
Acetylene stripper 7 is connect with the advanced alkynes stripper 6；The advanced alkynes stripper 6 exports advanced alkynes gas, and
Solvent is carried out to handle；
Most advanced alkynes is separated in prewashing tower 1, but since the property of advanced alkynes is similar to acetylene, from prewashing tower 1
There are also part acetylene gas other than advanced alkynes in the gas of middle output, and it is dense that acetylene stripping is first passed through before the extraction of advanced alkynes
Tower 7 extracts the acetylene of some residual, after using advanced alkynes stripper 6 extract partial higher alkynes.
Prewashing tower 1 and main tower 2 of washing are added with nmp solvent；
Nmp solvent chemicals Chinese is N-Methyl pyrrolidone, a kind of polar aprotic solvent, in prewashing
Tower 1 and main wash in tower 2 separate synthesis gas, ethylene, methane mixture from cracking gas, obtain the saturation dissolved with acetylene
Nmp solvent.
As shown in Fig. 2, being the structural schematic diagram of potassium carbonate adding set of the invention.Potassium carbonate adding set 9 include according to
Solution of potassium carbonate configured slot 11, NMP mixed liquor storage tank 14 and the solvent pump 15 of secondary connection；
Solution of potassium carbonate is first mixed with nmp solvent, after by solvent pump 15 into system, solution of potassium carbonate configured slot
Valve 13 is equipped between 11 and NMP mixing liquid storage tank 14.
Agitating device 10 is equipped in solution of potassium carbonate configured slot 11；11 outer circulation of solution of potassium carbonate configured slot is equipped with carbon
Sour potassium delivery pump 12；
Agitating device 10 is equipped in solution of potassium carbonate make-up tank 11, for stirring in solution of potassium carbonate process for preparation
It mixes, and solution of potassium carbonate make-up tank 11 is externally provided with potassium carbonate delivery pump 12, potassium carbonate delivery pump 12 and solution of potassium carbonate configured slot
11 are circularly set, and solution of potassium carbonate is recycled in two equipment, dissolve potassium carbonate in the solution more abundant, make potassium carbonate
The concentration of solution is average.
Another object of the present invention is to provide a kind of natural gas pyrolysis acetylene concentration technique,
A kind of natural gas pyrolysis acetylene concentration technique, technique system provided by any of the above-described carry out.
The step of technique, is as follows:
(1) cracking gas enters prewashing tower 1, and nmp solvent is added in prewashing tower 1, after removing most of higher alkyne, conveying
Tower 2 is washed to master；
(2) nmp solvent is added in Xiang Zhuxi tower 2, acetylene and synthesis gas is separated, synthesis gas enters tail gas washing tower
8 are washed with condensate liquid, and acetylene enriched solvent enters counter-current stripper 3；
(3) acetylene enriched solvent desorbs acetylene and circulating air in counter-current stripper 3, and surplus solution is sent to solvent processing
Unit；
(4) solution of potassium carbonate is added in surplus solution, after by heating power desorber 4, desorb a small amount of acetylene and be back to
Adverse current Analytic Tower 3, solution are input to vacuum column 5；
(5) the further desorption of acetylene is realized in vacuum column 5, acetylene gas is delivered to heating power desorber 4, remaining solution
Then it is delivered to advanced alkynes stripper 6；
(6) removing of advanced alkynes, and recycling design are carried out in advanced alkynes stripper 6.
Processing step provided by the invention, is added to solution of potassium carbonate in extracting and concentrating technology, has adjusted the PH of NMP system
Value, it is suppressed that the generation of polymer, and also potassium carbonate is not involved in the physical-chemical reaction in technique, will not generate shadow to technique
It rings, ensure that the safety of device, solution of potassium carbonate has adjusted the pH value of system, it is therefore prevented that NMP is hydrolyzed to the corrosion in tower tank.
The concentration for being added to the solution of potassium carbonate of system is controlled in 0.02~1wt%, preferably 0.2~0.6wt%, carbonic acid
By the way of being continuously added to, additional amount is controlled potassium solution by the pH value and conductivity of NMP large and small cycles.
PH value is between 7.5~8.5, and conductivity is 50~200us/cm.Concentration of potassium carbonate is configured to 0.5%, is matched
Than titration experiments, experimental result is shown in the following table 1.
Table 1:NMP solvent potassium carbonate titrates Experiment of Electrical Conductivity
Determine that diaphragm metering pump, design discharge 38L/h, lift 45M calculate the flow of carbonic acid potassium pump, as a result see the table below 2:
Table 2: potassium carbonate pump discharge calculates:
Solution of potassium carbonate is added in natural gas pyrolysis acetylene concentration technique, has adjusted the pH value of system, it is therefore prevented that be
The corrosion of system, while the generation of polymer is inhibited, alleviate the blocking of system.
After new system, operation is more steady, and parameters can reach design requirement, and NMP consumption is according to domestic same
Industry is horizontal, reduces 10%, it is assumed that NMP designs 200 tons of annual consumption, then can save 200 × 10%=20 tons, every year with NMP
Unit price is 1.5 ten thousand yuan of calculating, saves money ten thousand yuan of 20 × 1.5=30 every year.Before transformation, the cleaning cycle of system about 3 months, change
It is 6 months that it is elongated, which to make rear cleaning cycle, then annual cleaned system maintenance cost saves 14.4 ten thousand.To sum up, provided by the invention new
Production cost can be greatly lowered for existing system in system.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and this
Field technical staff can be designed alternative embodiment without departing from the scope of the appended claims.In claim
In, any reference symbol between parentheses should not be configured to limitations on claims.
Claims (9)
1. a kind of natural gas pyrolysis acetylene concentration system, which is characterized in that the system comprises prewashing tower, masters to wash tower, acetylene
Stripper, tail gas washing tower, counter-current stripper and solvent processing unit；
The solvent processing unit includes potassium carbonate adding set, heating power desorber, vacuum column and advanced alkynes stripper；
The prewashing tower washes tower with master and acetylene stripper is separately connected；
The master washes tower and connect with tail gas washing tower and counter-current stripper；
The counter-current stripper output circulating air and acetylene gas.
2. acetylene concentration system according to claim 1, which is characterized in that
The counter-current stripper is connect with the heating power desorber, and potassium carbonate adding set is connected in the connection line；
The heating power desorber is connect with vacuum column；The vacuum column is connect with the advanced alkynes stripper；
The acetylene gas further desorbed in the vacuum column is returned in counter-current stripper by heating power desorber.
3. acetylene concentration system according to claim 1, which is characterized in that
The tail gas washing tower is connect with condensate liquid input channel, exports synthesis gas.
4. acetylene concentration system according to claim 1, which is characterized in that
The acetylene vapour concentration tower is connect with the advanced alkynes stripper；The advanced alkynes stripper exports advanced alkynes gas, and
Solvent is carried out to handle.
5. acetylene concentration system according to claim 1, which is characterized in that
The prewashing tower and main tower of washing are added with nmp solvent.
6. acetylene concentration system according to claim 1, which is characterized in that the potassium carbonate adding set includes successively connecting
Solution of potassium carbonate configured slot, NMP mixed liquor storage tank and the solvent pump connect.
7. acetylene concentration system according to claim 6, which is characterized in that be equipped with and stir in the solution of potassium carbonate configured slot
Mix device；The solution of potassium carbonate configured slot is externally provided with potassium carbonate delivery pump；The potassium carbonate delivery pump and the potassium carbonate are molten
Liquid configured slot is connected by circulation.
8. a kind of natural gas pyrolysis acetylene concentration technique, which is characterized in that the technique is appointed in the claims 1~7
One provided system carries out.
9. natural gas pyrolysis acetylene concentration technique according to claim 8, which is characterized in that the step of the technique such as
Under:
Cracking gas enters prewashing tower, and nmp solvent is added in prewashing tower, after removing most of higher alkyne, is delivered to master and washes tower；
It is washed to master and adds nmp solvent in tower, acetylene and synthesis gas are separated, synthesis gas enters tail gas washing tower condensate liquid
It is washed, acetylene enriched solvent enters counter-current stripper；
Acetylene enriched solvent desorbs acetylene and circulating air in counter-current stripper, and surplus solution is sent to solvent processing unit；
Solution of potassium carbonate is added in surplus solution, after by heating power desorber, desorb a small amount of acetylene and be back to adverse current and desorb
Tower, solution are input to vacuum column；
The further desorption of acetylene is realized in vacuum column, acetylene gas is delivered to heating power desorber, remaining solution is then delivered to
Advanced alkynes stripper；
The removing of advanced alkynes, and recycling design are carried out in advanced alkynes stripper.
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| CN107954820A (en) * | 2016-10-17 | 2018-04-24 | 中国石油化工股份有限公司 | A kind of method for removing the thick middle-and-high-ranking alkynes of acetylene gas |
| CN108218659A (en) * | 2016-12-21 | 2018-06-29 | 中国石化集团四川维尼纶厂 | Rich advanced alkynes solvent reclamation utilizes method in gas by partial oxidation of natural acetylene technique |
-
2018
- 2018-12-28 CN CN201811616920.0A patent/CN109796295A/en active Pending
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| CN102432417A (en) * | 2010-09-29 | 2012-05-02 | 中国石油化工集团公司 | Concentrating method for preparing acetylene by partially oxidizing natural gas |
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| CN106431814A (en) * | 2016-10-12 | 2017-02-22 | 西南化工研究设计院有限公司 | Acetylene concentration process and device |
| CN107954820A (en) * | 2016-10-17 | 2018-04-24 | 中国石油化工股份有限公司 | A kind of method for removing the thick middle-and-high-ranking alkynes of acetylene gas |
| CN108218659A (en) * | 2016-12-21 | 2018-06-29 | 中国石化集团四川维尼纶厂 | Rich advanced alkynes solvent reclamation utilizes method in gas by partial oxidation of natural acetylene technique |
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