CN105126536B - Purifying device for natural gas, purification system, processing system and adsorbent regeneration method - Google Patents
Purifying device for natural gas, purification system, processing system and adsorbent regeneration method Download PDFInfo
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- CN105126536B CN105126536B CN201510485288.0A CN201510485288A CN105126536B CN 105126536 B CN105126536 B CN 105126536B CN 201510485288 A CN201510485288 A CN 201510485288A CN 105126536 B CN105126536 B CN 105126536B
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Abstract
The present invention provides a kind of purifying device for natural gas, purification system, processing system and adsorbent regeneration methods.Wherein, the purifying device for natural gas includes the first adsorption tower, the second adsorption tower, preheating apparatus and heat riser, the entrance of preheating apparatus with cold air source for being connected, receive the cold air that cold air source provides, the outlet of preheating apparatus is connected with the cold blowing workshop section entrance of the first adsorption tower, the cold blowing workshop section outlet of first adsorption tower is connected by heat riser with the hot blow workshop section entrance of the second adsorption tower, and the hot blow workshop section outlet of the second adsorption tower is for exporting the gas in the second adsorption tower.The heat of the gas of the cold blowing workshop section outlet output of first adsorption tower is utilized again, realizes and the energy is efficiently used, greatly increase the utilization rate of the energy; and reduce the energy consumption of heat riser; the energy is further saved, in addition, being also effectively protected the first adsorption tower.
Description
Technical field
The present invention relates to natural gas processing technical fields, in particular to purifying device for natural gas, purification system, place
Reason system and adsorbent regeneration method.
Background technology
Natural gas is a kind of clean energy and industrial chemicals, and China's natural gas long distance pipeline is by the way of high pressure gas transmission
By natural gas transportation to each natural valve station, each natural valve station is conveyed into downstream after carrying out reduced pressure treatment to high-pressure natural gas again
Pipe network, or carry out liquefaction and be processed into liquefied natural gas, for users to use.
In general, can be right containing impurity, each impurity such as water, mercury, sour gas in the unstripped gas from natural valve station
The system generation that natural gas carries out decompression processing seriously affects.For example, moisture and natural gas in natural gas are under certain condition
It forms hydrate and blocks pipeline, influence cooling liquid process；Acid can be formed in sour gas free water in natural gas, to
Corrode pipeline and equipment；Mercury is very serious to the corrosion of aluminum appliance and pipeline；Additionally, due to the presence of moisture, will also result in need not
The power consumption wanted；Since natural gas liquefaction temperature is relatively low, the presence of water and sour gas also results in the frozen block of equipment, therefore must
It must removing.
In order to solve this problem, currently used mode is to first pass through purification system before natural gas is depressurized
Purified treatment is made to the unstripped gas at each natural valve station.Currently, being typically provided with multiple clean units, Mei Gejing in purification system
Change in unit and be provided with multiple adsorption towers, adsorbent is filled in each adsorption tower, selectively removes in raw natural gas
The impurity such as sour gas, mercury, water, multiple towers can be carried out at the same time absorption and regeneration（Desorption）Circulate operation.Common absorption side
Method is TSA（Temp.-changing adsorption, Temperature Swing Adsorption）.Wherein, TSA suction types are entered from bottom of tower
Natural gas in tower under the action of adsorbent by under the impurity absorptions such as sour gas, water in gas, after the completion of absorption, with height
Warm stripping gas is regenerated, i.e., adsorbs the impurity such as water and sour gas with adsorbent under room temperature or low temperature, later at high temperature
Desorption and regeneration is carried out to adsorbent, constitutes the regeneration cycle of adsorbent, achievees the purpose that continuously separation and purification gas.
In general, TSA temp.-changing adsorptions include three absorption, hot blow and cold blowing workshop sections, multiple valves are provided on adsorption tower
Door realizes absorption, the air inlet of hot blow and cold blowing process, specially by the switching of each valve：It opens and absorption process pair
The valve answered, high-pressure natural gas enter in adsorption tower, and under the action of adsorbent that sour gas in gas etc. is miscellaneous in tower
Matter absorbs, and after the completion of absorption, closes valve corresponding with absorption process, opens valve corresponding with hot blow process, input
High-temperature gas is desorbed the impurity such as adsorbent water and sour gas with desorption under high temperature gas, is closed after the completion of hot blow
Valve corresponding with hot blow process, and valve corresponding with cold blowing process is opened, cold blowing gas is conveyed into adsorption tower, to adsorption tower
Cool down.When the temperature of adsorption tower drops to preset temperature value, absorption process is entered back into after cold blowing, is thus constituted and is inhaled
Attached dose of absorption and regenerated cycle achieve the purpose that continuously separation and purification gas.PSA pressure-variable adsorptions include absorption and hot blow
Liang Ge workshop sections, the course of work phase of the course of work of the two workshop sections and absorption workshop section and hot blow workshop section in TSA temp.-changing adsorptions
Together, the cold blowing workshop section in TSA temp.-changing adsorptions is only omitted.
In general, in the cold blowing process of TSA temp.-changing adsorptions, cold blowing gas, which is passed through in adsorption tower, to exchange heat so that absorption
The temperature of tower reduces, and the temperature of corresponding cold blowing gas increases, and is exported by adsorption tower.The raised cold blowing gas of temperature of output is directly defeated
Enter into gas distributing system, there is no being made full use of to its heat, causes the waste of the energy.In addition, being needed in hot blow process
It to be passed through high-temperature gas to adsorption tower, heat the cryogenic gas in natural gas processing system generally by heating device
Adsorption tower is inputted after to preset temperature, since the gas temperature is relatively low, it is therefore desirable to expend the more energy and add to gas
Heat becomes high-temperature gas, this will certainly also cause the waste of the energy.
Invention content
In consideration of it, the present invention proposes a kind of purifying device for natural gas, purification system, processing system and adsorbent reactivation side
Method, it is intended to solve the problems, such as that the heat of the gas of cold blowing process output cannot make full use of and in turn result in energy waste.
On one side, the present invention proposes a kind of purifying device for natural gas, which includes：First adsorption tower,
Two adsorption towers, preheating apparatus and heat riser；Wherein, the entrance of preheating apparatus receives cold for being connected with cold air source
The cold air that air source provides；The outlet of preheating apparatus is connected with the cold blowing workshop section entrance of the first adsorption tower, the first adsorption tower
The outlet of cold blowing workshop section is connected by heat riser with the hot blow workshop section entrance of the second adsorption tower；The hot blow workshop section of second adsorption tower
Outlet is for exporting the gas in the second adsorption tower.
Further, in above-mentioned purifying device for natural gas, heat riser is heater.
Further, above-mentioned purifying device for natural gas further includes：First control valve and the second control valve；Wherein, cold air source
Pass sequentially through the first control valve, preheating apparatus is connected with the cold blowing workshop section entrance of the first adsorption tower；Cold air source also passes through
Two control valves are connected with the cold blowing workshop section entrance of the first adsorption tower, and the pipeline where the first control valve and preheating apparatus
Parallel pipeline is formed with the pipeline where the second control valve.
Further, in above-mentioned purifying device for natural gas, preheating apparatus is First Heat Exchanger.
Further, above-mentioned purifying device for natural gas further includes：Third adsorption tower and compressor；Wherein, third adsorption tower
Absorption workshop section entrance for being passed through raw natural gas into third adsorption tower；The absorption workshop section outlet of third adsorption tower passes through pressure
Contracting machine is connected with the entrance of the first passage of First Heat Exchanger, and the outlet of the first passage of First Heat Exchanger is for exporting gas
Body；And cold air source is connected by the first control valve with the entrance of the second channel of First Heat Exchanger, the of First Heat Exchanger
The outlet in two channels is connected with the cold blowing workshop section entrance of the first adsorption tower.
Further, above-mentioned purifying device for natural gas further includes：Second heat exchanger；Wherein, the first of the second heat exchanger is logical
The entrance in road is connected with the outlet of the first passage of First Heat Exchanger, and the outlet of the first passage of the second heat exchanger is used for gas
Body exports；The entrance of the second channel of second heat exchanger is for receiving flash steam；The outlet of the second channel of second heat exchanger with
The fuel inlet of heat riser is connected, for providing fuel for heat riser；The outlet of the second channel of second heat exchanger is also
For flash steam to be exported.
On the other hand, the present invention proposes a kind of natural gas purification system, which includes at least one
A above-mentioned purifying device for natural gas.
Another aspect, the present invention propose a kind of natural gas processing system, which includes above-mentioned
Natural gas purification system.
Another aspect, the present invention propose adsorbent regeneration method in a kind of adsorption tower, the adsorbent regeneration method packet
Include following steps：Temperature difference determines step, between the gas and the gas of input that determine the adsorption tower output in cold blowing process
Temperature difference；First executes step, will be for being dropped to the adsorption tower in cold blowing process when temperature difference is more than preset value
The first gas exported with the adsorption tower in absorption process of the cold air of temperature carries out heat exchange heating, then the gas after heat exchange heating is defeated
Enter in the adsorption tower in cold blowing process, as cold blowing gas；Regeneration step, the gas that will be exported in the adsorption tower of cold blowing process
After being heated to preset temperature, in adsorption tower of the input in hot blow process, as regeneration gas.
Further, it is determined between step and regeneration step in temperature difference in adsorbent regeneration method in above-mentioned adsorption tower
Further include：Second executes step, and when temperature difference is less than or equal to preset value, cold air is directly inputted the absorption in cold blowing process
In tower, as cold blowing gas.
The higher gas of temperature of the cold blowing workshop section outlet output of first adsorption tower is heated through heat riser and is risen by the present invention
It is passed through after temperature in the second adsorption tower and is used as regeneration gas, solve the temperature of the cold blowing workshop section outlet output of adsorption tower in the prior art
Raised cold blowing gas directly input gas distributing system and caused by energy waste the problem of, realize and the energy efficiently used,
Greatly increase the utilization rate of the energy；Also, with the cryogenic gas in natural gas processing system is added in the prior art
Heat is compared as regeneration gas, since the temperature of the gas of the first adsorption tower output in the present invention is higher than low pressure in the prior art
Cryogenic gas can further save the energy so the energy of the heat riser consumption in the present invention is low；In addition, cold air inputs
Pre-heating temperature elevation is first carried out before first adsorption tower, on the one hand, cold air has certain temperature after pre-heating temperature elevation, by first
After adsorption tower heat exchange in input heat riser, then the consumption of heat riser energy is reduced, on the other hand, avoids temperature ratio
Lower cold air carries out being in direct contact the damage for leading to the first adsorption tower with higher first adsorption tower of temperature, is effectively protected
First adsorption tower extends the service life of the first adsorption tower.
Description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit are common for this field
Technical staff will become clear.Attached drawing only for the purpose of illustrating preferred embodiments, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings：
Fig. 1 is the structural schematic diagram of purifier provided in an embodiment of the present invention；
Fig. 2 is the flow chart of adsorbent regeneration method in adsorption tower provided in an embodiment of the present invention；
Fig. 3 is the another flow chart of adsorbent regeneration method in adsorption tower provided in an embodiment of the present invention.
Specific implementation mode
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
Completely it is communicated to those skilled in the art.It should be noted that in the absence of conflict, embodiment in the present invention and
Feature in embodiment can be combined with each other.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
It will be appreciated by those skilled in the art that for TSA temp.-changing adsorption methods, including absorption workshop section, hot blow workshop section and cold
Workshop section is blown, the absorption workshop section entrance for inputting gas to absorption workshop section should accordingly, on adsorption tower be provided with, for that will adsorb
The absorption workshop section outlet of gas output in workshop section；It should still be provided with the hot blow for inputting gas to hot blow workshop section on adsorption tower
Workshop section's entrance, for exporting the hot blow workshop section of the gas output in hot blow workshop section；It is should still be provided on adsorption tower for cold
The cold blowing workshop section entrance for blowing workshop section's input gas, for exporting the cold blowing workshop section of the gas output in cold blowing workshop section.For PSA
For pressure swing absorption process, absorption workshop section and hot blow workshop section are only included, absorption workshop section accordingly, on adsorption tower should be also provided with and enter
Mouth and the outlet of absorption workshop section；It should still be provided with hot blow workshop section entrance and the outlet of hot blow workshop section on adsorption tower.
Purifier embodiment：
Referring to Fig. 1, Fig. 1 is the structural schematic diagram of purifier provided in an embodiment of the present invention.As shown, the purification fills
It sets including the first adsorption tower 1, the second adsorption tower 3, preheating apparatus and heat riser 2.
Wherein, the entrance of preheating apparatus receives the cold air that cold air source 4 provides for being connected with cold air source 4.Preheating
The outlet of device is connected with the cold blowing workshop section entrance 11 of the first adsorption tower, and the cold blowing workshop section outlet 12 of the first adsorption tower passes through liter
Warm device 2 is connected with the hot blow workshop section entrance 31 of the second adsorption tower.The hot blow workshop section outlet 32 of second adsorption tower is for exporting
Gas in second adsorption tower 3.
It should be noted that when it is implemented, preheating apparatus can be heater, heat exchanger, or this field
Known to technical staff may be implemented heating, heating purpose other devices, the present embodiment do not do it any restriction.Heating
Device 2 can be heater, heat-conducting oil furnace, tube furnace etc., it is of course also possible to which what is be well known to those skilled in the art can be real
Other devices of purpose are now heated, the present embodiment does not do it any restriction.
In the present embodiment, cold air source 4 can be arbitrary cold air source, but in order to be made full use of to the energy, avoid energy
The waste in source can be passed through the first adsorption tower 1 using the refrigeration gas generated in natural gas processing system as the cold air of cold air source
It is interior, cool down to the first adsorption tower 1, also, using the refrigeration gas generated in natural gas processing system as the cold air of cold air source,
On the one hand, the refrigeration gas generated in natural gas processing system has already passed through purified treatment, and the refrigeration gas of not impurity is passed through
One adsorption tower 1, the second adsorption tower 3, are effectively protected the first adsorption tower 1 and the second adsorption tower 3, avoid the impurity in refrigeration gas
The corrosion of the first adsorption tower and the second adsorption tower is chemically reacted and caused with the first adsorption tower 1, the second adsorption tower 3, is extended
The service life of first adsorption tower and the second adsorption tower.On the other hand, refrigeration gas has already been through decompression processing, then can be straight
Connect in the first adsorption tower 1 and the second adsorption tower 3, without before being passed through the first adsorption tower 1, the second adsorption tower 3 to refrigeration
Gas carries out decompression processing, simplifies processing step, saves the cost of decompression.
It will be appreciated by those skilled in the art that the natural gas processing system in the present embodiment be stand on the door come high pressure it is natural
Gas is purified, cooling is handled, and the natural gas after purification, cooling enters in liquefaction system, all the way expanded machine, heat exchanger decompression
Output is to gas distributing system after heating, and another way is liquefied as liquified natural gas, and the flash steam that liquified natural gas is generated is through changing
It is exported to gas distributing system after hot device.
The course of work of the present embodiment：The cold air that cold air source 4 provides enters pre-add hot charging by the entrance of preheating apparatus
In setting, preheating apparatus preheats cold air so that cold air carries certain temperature.Cold air after preheating is inhaled by first
The cold blowing workshop section entrance 11 of attached tower enters the first adsorption tower 1.In the first adsorption tower 1, the cold air after preheating and process hot blow work
In the adsorbent progress heat exchange for waiting for cooling state after sequence, adsorbent is cooled down, i.e., the first adsorption tower 1 is carried out
It cools.First high temperature of itself of adsorption tower 1 temperature after heat exchange continuously decreases, and the cold air after preheating is handed over through overheat
It changes rear temperature to increase, by 12 output of cold blowing workshop section outlet of the first adsorption tower.The raised cold air of temperature of output enters heating dress
It sets in 2, heat riser 2 carries out heat temperature raising to the raised cold air of the temperature of input, reaches preset temperature, is input to second
In adsorption tower 3, the regeneration gas as 3 hot blow process of the second adsorption tower.In the second adsorption tower 3, after regeneration gas and adsorbing contaminant
Adsorbent interaction in state to be resolved, adsorbent impurity is parsed, then, the regeneration gas after desorption
By 32 output of hot blow workshop section outlet of the second adsorption tower to gas distributing system, for users to use.
It should be noted that, although cold air temperature after preheating increases, but the first adsorption tower 1 is due to passing through hot blow work
The temperature of cold air after the temperature of itself will be preheated significantly larger than after sequence, therefore the cold air after preheating is passed through the first adsorption tower 1
It is interior, the purpose to cool to the first adsorption tower 1 still may be implemented.
It should be noted that when it is implemented, preset temperature can be determined according to actual conditions, the present embodiment to this not
Do any restriction.
As can be seen that in the present embodiment, by the higher gas of temperature of 12 output of cold blowing workshop section outlet of the first adsorption tower
It is passed through after 2 heat temperature raising of heat riser in the second adsorption tower 3 and is used as regeneration gas, solve the cold blowing of adsorption tower in the prior art
The raised cold blowing gas of temperature of workshop section's outlet output directly input gas distributing system and caused by energy waste the problem of, realize
The energy is efficiently used, the utilization rate of the energy is greatly increased；Also, in the prior art in natural gas processing system
Cryogenic gas heated and compared as regeneration gas, the temperature by the gas of the first adsorption tower output in this present embodiment is high
In low-pressure low-temperature gas in the prior art, so the energy that the heat riser 2 in the present embodiment consumes is low, can further save
The about energy；In addition, first carrying out pre-heating temperature elevation before the first adsorption tower of cold air input 1, on the one hand, cold air has after pre-heating temperature elevation
There is certain temperature, after the heat exchange of the first adsorption tower 1 in input heat riser 2, then reduces disappearing for heat riser energy
On the other hand consumption avoids higher first adsorption tower of the relatively low cold air of temperature and temperature 1 and be in direct contact leading to first
The damage of adsorption tower is effectively protected the first adsorption tower 1, extends the service life of the first adsorption tower.
Can also include the first control valve 5 and the second control valve 6 referring to Fig. 1, in above-described embodiment.Wherein, cold air source 4 according to
It is secondary to be connected with the cold blowing workshop section entrance 11 of the first adsorption tower by the first control valve 5, preheating apparatus.Specifically, cold air source 4
It is connected with the entrance of preheating apparatus by the first control valve 5, the cold blowing work of the outlet and the first adsorption tower of preheating apparatus
Section entrance 11 is connected.
Cold air source 4 is also connected by the second control valve 6 with the cold blowing workshop section entrance 11 of the first adsorption tower, also, first
The pipeline where pipeline and the second control valve 6 where control valve 5 and preheating apparatus forms parallel pipeline, i.e. cold air source 4 is defeated
The gas gone out, can pass sequentially through the first control valve 5, preheating apparatus is input in the first adsorption tower 1, can also pass through second
Control valve 6 is input in the first adsorption tower 1.
It should be noted that the first control valve 5, the second control valve 6 can be solenoid valve, pilot operated valve device etc., or this
Other devices that control piper break-make may be implemented known to field technology personnel, the present embodiment do not do this any restriction.
The course of work of the present embodiment：Cold air after preheating is passed through in the first adsorption tower 1, is carried out to the first adsorption tower 1
It cools, the temperature of the cold air after corresponding preheating continues to increase, that is to say, that the temperature of the gas of the first adsorption tower 1 output
It spends relatively high.When the difference between the temperature and the temperature of output gas that the first adsorption tower inputs gas is more than preset value, beat
The first control valve 5 is opened, the second control valve 6 is closed, then the cold air of cold air source 4 is input to preheating apparatus by the first control valve 5
Interior pre-heating temperature elevation, the cold air after preheating are passed through in the first adsorption tower, repeat the course of work in above-described embodiment.With cold blowing work
The progress of sequence, the temperature in the first adsorption tower 1 can continuously decrease, i.e. the temperature of the gas of the first adsorption tower 1 output can gradually drop
It is low.When the difference between the temperature and the temperature of output gas that the first adsorption tower inputs gas is less than or equal to preset value, close
First control valve 5, opens the second control valve 6, the cold air of cold air source 4 directly by the cold blowing workshop section entrance 11 of the first adsorption tower into
Enter and exchange heat with the first adsorption tower 1 in the first adsorption tower 1, the first adsorption tower of cold air pair 1 cools down, and cold air passes through
Temperature increases after heat exchange, by carrying out heat temperature raising in 12 output to the heat riser 2 of cold blowing workshop section outlet of the first adsorption tower, makees
For regeneration gas.Adsorbent in the second adsorption tower of regeneration gas pair 3 carries out hot blow, and adsorbent impurity is parsed, and solves
Regeneration gas after suction is exported to gas distributing system, for users to use.As the temperature of the first adsorption tower continuously decreases, when the first suction
When the temperature for the gas that attached tower 1 exports drops to default low temperature, then the cold blowing process of the first adsorption tower is completed, and can be entered next
The absorption process of cycle.
It should be noted that it should be appreciated by those skilled in the art that as the temperature of the first adsorption tower continuously decreases, then lead to
Enter the first adsorption tower of cold air pair 1 in the first adsorption tower 1 there is no cooling effect, thus the gas of the first adsorption tower 1 input with
The temperature difference between the gas of output should be more than or equal to zero.
When it is implemented, can be by mounted on the cold blowing workshop section inlet of the first adsorption tower and cold blowing workshop section exit
Temperature instrument come detect by the first adsorption tower cold blowing workshop section entrance 11 input gas temperature and by first absorption
The temperature of the gas exported at the cold blowing workshop section outlet 12 of tower.
When it is implemented, temperature instrument can be program-controlled chain with the first control valve 5, the second control valve 6.Temperature detection
Instrument detects temperature value, calculates difference between the two, temperature difference and preset value are compared, and is preset when temperature difference is more than
When value, then the first control valve 5 is opened, closes the second control valve 6；When temperature difference is less than or equal to preset value, then the first control is closed
Valve 5 processed opens the second control valve 6.
It should be noted that when it is implemented, preset value and default low temperature can be determined according to actual conditions, this implementation
Example does not do this any restriction.
As can be seen that in the present embodiment, with the progress of cold blowing process, the temperature in the first adsorption tower 1 continuously decreases, then
The temperature of the gas of first adsorption tower 1 output can also continuously decrease, and the cold air of cold air source 4 is passed directly into the first adsorption tower 1,
So that the first adsorption tower 1 quickly cools, the energy is made full use of, avoids the loss of the energy.
Referring to Fig. 1, in the present embodiment, preheating apparatus can be First Heat Exchanger 7, then can also include in the embodiment
Third adsorption tower 8 and compressor 9.Wherein, the absorption workshop section entrance 81 of third adsorption tower into third adsorption tower 8 for being passed through original
Expect natural gas.The absorption workshop section of third adsorption tower exports 82 entrances 71 by compressor 9 and the first passage of First Heat Exchanger
It is connected, the outlet 72 of the first passage of First Heat Exchanger is used for output gas, and the gas of output enters liquefaction system.Cold air source
4 are connected by the first control valve 5 with the entrance 73 of the second channel of First Heat Exchanger, and the second channel of First Heat Exchanger goes out
Mouth 74 is connected with the cold blowing workshop section entrance 11 of the first adsorption tower.
The course of work of the present embodiment：Between the first adsorption tower 1 inputs the temperature and the temperature of output gas of gas
When difference is more than preset value, the cold air of cold air source 4 is entered by the first control valve 5 in the second channel of First Heat Exchanger 7, is waited for
Heat exchange heating.Raw natural gas is entered by the bottom of third adsorption tower 8, and phase interaction is carried out with the adsorbent in third adsorption tower 8
With adsorbent gets off impurity absorption in raw natural gas, and purified natural gas, which enters in compressor 9, to be compressed, then only
The temperature of natural gas after change increases.The raised purified natural gas of temperature enters in the first passage of First Heat Exchanger 7, etc.
Heat drop temperature to be changed.Therefore, the raised purified day of temperature in the cold air and first passage in the second channel of First Heat Exchanger 7
Right gas carries out heat exchange, then the cold air temperature in second channel increases, enter back into the first adsorption tower 1 to the first adsorption tower 1 into
Row cools；The temperature of purified natural gas reduces in first passage, passes through the outlet of the first passage of First Heat Exchanger
72 outputs.
It can be seen that in the present embodiment, the temperature after compressor 9 that the cold air in cold air source 4 is exported with third adsorption tower 8
It spends raised purified natural gas to exchange heat, realizes the pre-heating temperature elevation to cold air, and to purified natural gas
It cools, improves the utilization rate of the energy.
Can also include the second heat exchanger 10 referring to Fig. 1, in above-described embodiment.Wherein, the first passage of the second heat exchanger
Entrance 101 be connected with the outlet 72 of the first passage of First Heat Exchanger, the outlet 102 of the first passage of the second heat exchanger is used
It is exported in by gas, the gas of output enters liquefaction system.The entrance 103 of the second channel of second heat exchanger is flashed for receiving
The outlet 104 of vapour, i.e. BOG gases, the second channel of the second heat exchanger is connected with the fuel inlet of heat riser 2, for for
Heat riser 2 provides fuel, and the outlet 104 of the second channel of the second heat exchanger is additionally operable to export flash steam to natural gas tube
Net.
It should be noted that it will be appreciated by those skilled in the art that by the second heat exchanger 10 exchange heat after flash steam
Output carries out flash steam to during gas distributing system, may also pass through other a series of relevant devices such as compressor
It is input to gas distributing system after corresponding processing, for users to use.
The course of work of the present embodiment：The purified natural gas warp that the outlet 72 of the first passage of First Heat Exchanger exports
The entrance 101 for crossing the first passage of the second heat exchanger enters in the second heat exchanger 10, waits for heat exchange cooling.Flash steam is that low temperature is low
The gas of pressure is entered by the entrance 103 of the second channel of the second heat exchanger in the second heat exchanger 10, and heat exchange heating is waited for.Cause
This, the purified natural gas in the first passage of the second heat exchanger 10 and the flash steam in the second channel of the second heat exchanger 10
Heat exchange is carried out, then the temperature of purified natural gas reduces in first passage, passes through going out for the first passage of the second heat exchanger
Mouth 102 exports；And the temperature of flash steam increases accordingly in second channel.Flash steam after temperature increases divides two-way to export, and one
Road is entered by the fuel inlet of heat riser 2 in heat riser 2, the fuel as heat riser；Another way is exported to natural
Gas pipe network, for users to use.
As can be seen that in the present embodiment, flash steam is in the second heat exchanger 10 and by the first passage in First Heat Exchanger 7
The purified natural gas of output exchanges heat so that purified natural gas enters before liquefaction system, can be preferably cold
But cool down, further improve the utilization rate of the energy；Also, a part of flash steam after heat exchange is supplied to heating as fuel
The burning of device 2 uses, and is further made full use of to the energy.
In above-described embodiment, the switching in each adsorption tower between the switching of each process and each adsorption tower can lead to
Cross program-controlled valve control.Connection described in above-described embodiment is to be connected by pipeline.
In conclusion in the present embodiment, the first adsorption tower is subjected to the gas with certain temperature generated after heat exchange
After heat temperature raising, as regeneration gas, it is passed through in the second adsorption tower and carries out hot blow parsing, gas not only is exported to the first adsorption tower
The heat of body is made full use of, and is realized and is efficiently used to the energy, and the utilization rate of the energy is improved, and reaches energy-efficient mesh
, also, the gas that the first adsorption tower exports is passed through in heat riser, the gas being passed through carries certain heat, improves
The air inlet enthalpy of heat riser, while the energy consumption of heat riser is also saved, and then improve the work effect of heat riser
Rate；In addition, being passed through again in the first adsorption tower after the cold air of cold air source is carried out pre-heating temperature elevation, on the one hand, cold air rises by preheating
There is certain temperature after temperature, using in input heat riser after the heat exchange of the first adsorption tower, then reduce heat riser energy
On the other hand the consumption of amount avoids the relatively low cold air of temperature and be in direct contact leading with higher first adsorption tower of temperature
The damage for causing the first adsorption tower is effectively protected the first adsorption tower, extends the service life of the first adsorption tower.
Purification system embodiment：
The invention also provides a kind of natural gas purification system, which includes that at least one any of the above-described kind of natural gas is net
Makeup is set.Wherein, for the specific implementation process of purifying device for natural gas referring to above description, the present embodiment is no longer superfluous herein
It states.
Since purifying device for natural gas has said effect, so the purification system with the purifying device for natural gas also has
There is corresponding technique effect.
Processing system embodiment：
The invention also provides a kind of natural gas processing system, which includes above-mentioned natural gas purification system.Wherein, day
The specific implementation process of right gas purification system is referring to above description, and details are not described herein for the present embodiment.
Since natural gas purification system has said effect, so the natural gas processing system with the natural gas purification system
System also has corresponding technique effect.
Regeneration method embodiment：
It is the flow chart of adsorbent regeneration method in adsorption tower provided in an embodiment of the present invention referring to Fig. 2, in Fig. 2.Such as figure
Shown, this method comprises the following steps：
Temperature difference determines step S1, between the gas and the gas of input that determine the adsorption tower output in cold blowing process
Temperature difference.Specifically, the gas of the inlet input of the adsorption tower in cold blowing process can be detected by temperature instrument
The temperature of the temperature of body and the gas of exit output.
First executes step S2, will be for being carried out to the adsorption tower in cold blowing process when temperature difference is more than preset value
The gas that the cold air of cooling is first exported with the adsorption tower in absorption process carries out heat exchange heating, then the gas after heating up that will exchange heat
In adsorption tower of the input in cold blowing process, as cold blowing gas.
In the present embodiment, the adsorption tower in cold blowing process is associated with the adsorption tower in absorption process, it will be warm
It spends relatively low cold air and is input to heat-exchanger rig, such as heat exchanger, while the temperature that the adsorption tower in absorption process is exported
Higher purified natural gas also inputs to heat-exchanger rig, in heat-exchanger rig, the relatively low cold air of temperature in absorption
The higher purified natural gas of temperature of the adsorption tower output of process exchanges heat, then the adsorption tower for being in absorption process exports
The higher purified natural gas of temperature after heat exchange temperature reduce, and the relatively low cold air of temperature temperature after heat exchange
It increases, the raised cold air of temperature after heat exchange is input in the adsorption tower in cold blowing process, as cold blowing gas.
Regeneration step S3, after being heated to preset temperature in the gas that the adsorption tower of cold blowing process exports, input is in
In the adsorption tower of hot blow process, as regeneration gas.It specifically, can be defeated to the adsorption tower in cold blowing process by heat riser
The gas gone out heats up, when it is implemented, preset value and preset temperature can be determined according to actual conditions, the present embodiment pair
It does not do any restriction.
In the present embodiment, when temperature difference is more than preset value, the temperature for the gas that the adsorption tower in cold blowing process exports
It is relatively high, the adsorption tower in cold blowing process is together in series with the adsorption tower in hot blow process, in cold blowing process
The higher gas of temperature of adsorption tower output heats up, and the gas after will heat up is passed through as regeneration gas in hot blow process
Adsorption tower in, in hot blow process adsorption tower carry out high temperature parsing.
As can be seen that in the present embodiment, by the higher gas of temperature of the outlet output of the adsorption tower in cold blowing process
It is passed through after heated heating in the adsorption tower in hot blow process and is used as regeneration gas, solve the cold blowing of adsorption tower in the prior art
The raised cold blowing gas of temperature of workshop section's outlet output directly input gas distributing system and caused by energy waste the problem of, realize
The energy is efficiently used, greatly increases the utilization rate of the energy, also, in the prior art in natural gas processing system
Cryogenic gas heated and compared as regeneration gas, by the gas of the adsorption tower output in cold blowing process in this present embodiment
Temperature is higher than low-pressure low-temperature gas in the prior art, so to the adsorption tower output in cold blowing process in the present embodiment
The little energy consumed when gas is heated can further save the energy；In addition, absorption of the cold air input in cold blowing process
Pre-heating temperature elevation is first carried out before tower, further reduced energy when being heated to the gas of the adsorption tower output in cold blowing process
The consumption of amount, also, avoid the relatively low cold air of temperature and carried out directly with the higher adsorption tower in cold blowing process of temperature
Contact leads to the damage of the adsorption tower in cold blowing process, is effectively protected the adsorption tower in cold blowing process, extends place
In the service life of the adsorption tower of cold blowing process.
Referring to Fig. 3, Fig. 3 is the another flow chart of adsorbent regeneration method in adsorption tower provided in an embodiment of the present invention.Such as
Shown in figure, this method comprises the following steps：
Temperature difference determines step S1, between the gas and the gas of input that determine the adsorption tower output in cold blowing process
Temperature difference.
First executes step S2, will be for being carried out to the adsorption tower in cold blowing process when temperature difference is more than preset value
The gas that the cold air of cooling is first exported with the adsorption tower in absorption process carries out heat exchange heating, then the gas after heating up that will exchange heat
In adsorption tower of the input in cold blowing process, as cold blowing gas.
Regeneration step S3, after being heated to preset temperature in the gas that the adsorption tower of cold blowing process exports, input is in
In the adsorption tower of hot blow process, as regeneration gas.
Wherein, the specific implementation process of above-mentioned steps S1, S2 and S3 is referring to above description, and the present embodiment is herein no longer
It repeats.
After temperature difference determines step S1, and further include before regeneration step S3：Second executes step S4, works as temperature
When difference is less than or equal to preset value, cold air is directly inputted in the adsorption tower in cold blowing process, as cold blowing gas.Specifically, cold
Air source can also be directly connected by pipeline with the entrance of the adsorption tower in cold blowing process.
Wherein, the first execution step S2 and the second execution step S4 do not have sequencing.
In the present embodiment, when temperature difference be less than or equal to preset value when, in cold blowing process adsorption tower itself temperature by
It gradually reduces, cold air is directly input to by pipeline in the adsorption tower in cold blowing process, to the adsorption tower in cold blowing process
Carry out rapidly cooling down.
It should be noted that it should be appreciated by those skilled in the art that with the adsorption tower in cold blowing process temperature by
It gradually reduces, being then passed through cold air in the adsorption tower in cold blowing process, there is no coolings to make to the adsorption tower in cold blowing process
With so the temperature difference between gas and the gas of output that the adsorption tower in cold blowing process inputs should be more than or equal to zero.
As can be seen that in the present embodiment, cold air is passed directly into the adsorption tower in cold blowing process, so as to be in cold blowing
The adsorption tower of process quickly cools, and makes full use of the energy, avoids the loss of the energy.
In conclusion in the present embodiment, by the higher gas of temperature of the outlet output of the adsorption tower in cold blowing process
It is passed through after heated heating in the adsorption tower in hot blow process and is used as regeneration gas, realized and the energy is efficiently used, significantly
Ground improves the utilization rate of the energy；Also, preheating is first passed through to the gas of the adsorption tower input in cold blowing process, then to being in
When the gas of the adsorption tower output of cold blowing process carries out heat temperature raising, since the temperature of gas is higher, then the energy consumed when heating
It measures low, the energy can be further saved；In addition, cold air first passes through preheating is input to the adsorption tower in cold blowing process again, avoid
The relatively low cold air of temperature, which with the temperature higher adsorption tower in cold blowing process be in direct contact, to be caused in cold blowing work
The damage of the adsorption tower of sequence is effectively protected the adsorption tower in cold blowing process, extends the adsorption tower in cold blowing process
Service life.
It should be noted that adsorbent regeneration method in adsorption tower in the present invention, above-mentioned purifying device for natural gas, above-mentioned
Natural gas purification system is similar with the principle of above-mentioned natural gas processing system, and related place can be cross-referenced.
Absorption workshop section and hot blow workshop section in the present embodiment can be TSA temp.-changing adsorptions, or PSA pressure-variable adsorptions,
Cold blowing workshop section only can be TSA temp.-changing adsorptions.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of purifying device for natural gas, which is characterized in that including：First adsorption tower (1), the second adsorption tower (3), pre-add hot charging
It sets and heat riser (2)；Wherein,
The entrance of the preheating apparatus receives the cold air that the cold air source provides for being connected with cold air source (4)；
The outlet of the preheating apparatus is connected with the cold blowing workshop section entrance (11) of first adsorption tower, first absorption
The cold blowing workshop section outlet (12) of tower is connected by the heat riser (2) with the hot blow workshop section entrance (31) of second adsorption tower
It connects；
The hot blow workshop section outlet (32) of second adsorption tower is used to export the gas in second adsorption tower；
The preheating apparatus is for preheating the cold air, to reduce the consumption of the heat riser (2) energy simultaneously
Protect first adsorption tower (1).
2. a kind of purifying device for natural gas according to claim 1, which is characterized in that the heat riser (2) is heating
Device.
3. a kind of purifying device for natural gas according to claim 1 or 2, which is characterized in that further include：First control valve
(5) and the second control valve (6)；Wherein,
It is cold with first adsorption tower that the cold air source (4) passes sequentially through first control valve (5), the preheating apparatus
Workshop section's entrance (11) is blown to be connected；
The cold air source (4) also passes through cold blowing workshop section entrance (11) phase of second control valve (6) and first adsorption tower
Connection, and where the pipeline where first control valve (5) and the preheating apparatus and second control valve (6)
Pipeline forms parallel pipeline.
4. a kind of purifying device for natural gas according to claim 3, which is characterized in that the preheating apparatus changes for first
Hot device (7).
5. a kind of purifying device for natural gas according to claim 4, which is characterized in that further include：Third adsorption tower (8) and
Compressor (9)；Wherein,
The absorption workshop section entrance (81) of the third adsorption tower into the third adsorption tower for being passed through raw natural gas；
The absorption workshop section outlet (82) of the third adsorption tower leads to by the first of the compressor (9) and the First Heat Exchanger
The entrance (71) in road is connected, and the outlet (72) of the first passage of the First Heat Exchanger is used for output gas；And
Entrance (73) phase that the cold air source (4) passes through first control valve (5) and the second channel of the First Heat Exchanger
Connection, the outlet (74) of the second channel of the First Heat Exchanger is connected with the cold blowing workshop section entrance (11) of first adsorption tower
It connects.
6. a kind of purifying device for natural gas according to claim 5, which is characterized in that further include：Second heat exchanger (10)；
Wherein,
Outlet (72) phase of the entrance (101) of the first passage of second heat exchanger and the first passage of the First Heat Exchanger
Connection, the outlet (102) of the first passage of second heat exchanger is for exporting gas；
The entrance (103) of the second channel of second heat exchanger is for receiving flash steam；
The outlet (104) of the second channel of second heat exchanger is connected with the fuel inlet of the heat riser (2), is used for
Fuel is provided for the heat riser；The outlet (104) of the second channel of second heat exchanger is additionally operable to export flash steam.
7. a kind of natural gas purification system, which is characterized in that including at least one day as described in any one of claim 1-6
Right air purifying apparatus.
8. a kind of natural gas processing system, which is characterized in that including natural gas purification system as claimed in claim 7.
9. adsorbent regeneration method in a kind of adsorption tower, which is characterized in that include the following steps：
Temperature difference determines step, determines the temperature between the gas and the gas of input that the adsorption tower in cold blowing process exports
Difference；
First execute step, when the temperature difference be more than preset value when, by for the adsorption tower in cold blowing process into
The gas that the cold air that row cools down first is exported with the adsorption tower in absorption process carries out heat exchange heating, then the gas after heating up that will exchange heat
In the body input adsorption tower in cold blowing process, as cold blowing gas；
Regeneration step, after the gas of the adsorption tower output in cold blowing process is heated to preset temperature, input is in heat
It blows in the adsorption tower of process, as regeneration gas.
10. adsorbent regeneration method in a kind of adsorption tower according to claim 9, which is characterized in that in the temperature difference
It determines between step and the regeneration step and further includes：
Second executes step, when the temperature difference is less than or equal to preset value, the cold air is directly inputted described in cold blowing
In the adsorption tower of process, as cold blowing gas.
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