CN107626184A - A kind of processing method of low-temperature methanol washing tail-gas - Google Patents
A kind of processing method of low-temperature methanol washing tail-gas Download PDFInfo
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- CN107626184A CN107626184A CN201710699401.4A CN201710699401A CN107626184A CN 107626184 A CN107626184 A CN 107626184A CN 201710699401 A CN201710699401 A CN 201710699401A CN 107626184 A CN107626184 A CN 107626184A
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Abstract
The invention discloses a kind of processing method of low-temperature methanol washing tail-gas.The step of processing method includes carrying out water scrubber washing to low-temperature methanol washing tail-gas, the low-temperature methanol washing tail-gas after washing is exchanged heat as low-temperature receiver and condensed water and/or low level heat energy.Apply the technical scheme of the present invention, utilized low-temperature methanol washing tail-gas as low temperature cold source, exchanged heat with condensate or low level heat energy, both the exhaust temperature of raising low-temperature methanol washing tail-gas has been reached, has reached low level heat energy and condensate inside returned enterprise again, saved the dosage of desalted water, saved and environmentally friendly purpose so as to realize.
Description
Technical field
The present invention relates to coal chemical industry field of purification, in particular to a kind of processing method of low-temperature methanol washing tail-gas.
Background technology
Low-temp methanol washing process be using methanol as absorbent, using methanol under high pressure low temperature to the H in conversion gas2S、CO2
And various organic sulfurs solution absorption property is big, and to CO and H2The small characteristic of solution absorption property, to remove the acidity in conversion gas
The impurity such as gas, workshop section's purified gas total sulfur content is strictly controlled out to absorb H in below 0.1ppm2S、CO2And various organic sulfurs
Decompression parsing, air lift and heating are carried out Deng the rich methanol after impurity, and regeneration Posterior circle uses, and freezes by ammonia compressor during this
To elute semen donors for low-temp methanol.
Rich in CO2Methanol be first expanded into CO2Tower top is desorbed, parsing obtains CO2Product gas, returned through feed gas chiller
Receive cold after enter tail gas washing tower by further removed from desalted water containing Trace Methanol after discharge.H2S concentrates tower bottom
It is passed through inert gas N2, to reduce the CO in gas phase2Partial pressure promotes the CO in sulfur-rich methanol2Preferably parse, analytically get over
Thoroughly, the CO after parsing2Contained after feed gas chiller reclaims cold into tail gas washing tower by further being removed from desalted water
Discharged after some Trace Methanols.
Fig. 1 shows the typical handling process schematic diagram of low-temperature methanol washing tail-gas one in the prior art：S1, low-temp methanol are washed
Dry gas：25 DEG C of temperature, pressure 0.15MPa；S2, turn into saturated with moisture after water scrubber：14.5 DEG C of temperature, pressure
0.14Mpa；S3, (it is provided with some lead through exhausting pipeline and drenches draining), reach 110 meters of empty clinders emptyings.Above-mentioned technique is primarily present
Problems with：1) leading leaching emptying has the risk of discharge tail gas；2) winter discharge space-time emptying nozzle has the risk of icing；3) due to
Emptying nozzle has icing, discharge CO be present2, CO tail gas spread unfavorable risk；4) energy waste that cold directly empties.
The content of the invention
The present invention is intended to provide a kind of processing method of low-temperature methanol washing tail-gas, to solve energy waste in the prior art
Technical problem.
To achieve these goals, according to an aspect of the invention, there is provided a kind of processing of low-temperature methanol washing tail-gas
Method.The step of processing method includes carrying out water scrubber washing to low-temperature methanol washing tail-gas, the low-temp methanol after washing washes tail
Gas is exchanged heat as low-temperature receiver and condensed water and/or low level heat energy.
Further, exchange heat and carried out in box-type heat exchanger.
Further, box-type heat exchanger includes shell side and tube side, and the low-temperature methanol washing tail-gas after washing walks shell side, condensed water
And/or low level heat energy walks tube side.
Further, tube side is wing formula heat exchanger tube.
Further, tube side is multi-stage heat exchanger pipe, while different condensed water and/or low level heat energy are exchanged heat.
Further, the low-temperature methanol washing tail-gas temperature after heat exchange is promoted to more than 45 DEG C.
Apply the technical scheme of the present invention, utilized low-temperature methanol washing tail-gas as low temperature cold source, with condensate or low
Position thermal source is exchanged heat, and has both reached the exhaust temperature for improving low-temperature methanol washing tail-gas, has reached low level inside returned enterprise again
Thermal source and condensate, save the dosage of desalted water, saved and environmentally friendly purpose so as to realize.
Brief description of the drawings
The Figure of description for forming the part of the application is used for providing a further understanding of the present invention, and of the invention shows
Meaning property embodiment and its illustrate be used for explain the present invention, do not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 shows the schematic flow sheet of the processing method of a low-temperature methanol washing tail-gas in the prior art；
Fig. 2 shows the schematic flow sheet of the processing method of low-temperature methanol washing tail-gas according to an embodiment of the present invention；
And
Fig. 3 shows the structural representation of box-type heat exchanger according to an embodiment of the present invention.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
According to the present invention, a kind of typically embodiment there is provided a kind of processing method of low-temperature methanol washing tail-gas.At this
The step of reason method includes carrying out water scrubber washing to low-temperature methanol washing tail-gas, the low-temperature methanol washing tail-gas after washing is as low-temperature receiver
Exchanged heat with condensed water and/or low level heat energy.
Apply the technical scheme of the present invention, utilized low-temperature methanol washing tail-gas as low temperature cold source, with condensate or low
Position thermal source is exchanged heat, and has both reached the exhaust temperature for improving low-temperature methanol washing tail-gas, has reached low level inside returned enterprise again
Thermal source and condensate, save the dosage (low level heat energy condensed water Returning utilization) of desalted water, saved and environmentally friendly mesh so as to realize
's.
Preferably, exchange heat and carried out in box-type heat exchanger, can so make full use of the cold of low-temperature methanol washing tail-gas, reach
To the purpose for saving the energy.
Preferably, box-type heat exchanger includes shell side and tube side, and the low-temperature methanol washing tail-gas after washing walks shell side, condensed water
And/or low level heat energy walks tube side.The flexibility of operation can so be increased, such as tube side is multi-stage heat exchanger pipe, while to difference
Condensed water and/or low level heat energy exchanged heat.
Preferably, tube side is wing formula heat exchanger tube, can make heat exchange more fully with rapidly.
According to a kind of typical embodiment of the present invention, the low-temperature methanol washing tail-gas temperature after heat exchange be promoted to 45 DEG C with
On.
According to a kind of typical embodiment of the present invention, as shown in Fig. 2 the processing method of low-temperature methanol washing tail-gas includes：
S1, the dry gas that low-temp methanol is washed：25 DEG C of temperature, pressure 0.15MPa；S2, turn into saturated with moisture after water scrubber：Temperature 14.5
DEG C, pressure 0.14Mpa；S3, a super box-type heat exchanger is set, shell side walks cleaning of off-gas, sets multistage fin-tube type heat exchanger tube,
It can be exchanged heat simultaneously with different fluid, exhaust temperature is lifted to 45 DEG C；Wherein, super box-type heat exchanger is as shown in figure 3, after washing
Low-temperature methanol washing tail-gas enter from first entrance 1, walk shell side, go out from first outlet 2；A variety of low level heat energies are respectively from second entrance
3rd, the 3rd entrance 5, the 4th entrance 7 and the 5th entrance 9 enter, respectively from the outlet 8 and the 5th of the outlet of second outlet the 4, the 3rd the 6, the 4th
Outlet 10 goes out, while realizes multi-stage heat exchanger；S4, (it is provided with some lead through exhausting pipeline and drenches draining), reach 110 meters of empty clinders rows
It is empty.
Using the embodiment, it can at least reach following technique effect：1st, leading leaching and can close on the way after re-heat, just
Leaching discharge opeing need not be led in the case of often (tail gas turns into unsaturated gas again)；2nd, winter discharge is empty and empty clinder eliminates icing
Possibility；3rd, the diffusion velocity of tail gas is enhanced, mitigates the pressure of surrounding environment；4th, the cold of emission has been reclaimed；5th, return
Condensate is received, it is possible to reduce low-grade steam, the dosage for reducing recirculated water etc..
Beneficial effects of the present invention are further illustrated below in conjunction with embodiment.
Embodiment 1
So that domestic Dalian University of Technology's low-temp methanol washes 600,000 tons of methanol technics as an example, using heat exchange box as shown in Figure 3
Low-temperature methanol washing tail-gas is exchanged heat, data are shown in Table 1.
Table 1
(1) exhaust temperature is brought up to 45 DEG C, annual (8000 hours), which can recover energy, to be calculated as follows：
165934kg/h × (45-15) × 0.8842kJ/kg.K × 8000h=35212522272kJ/a
Equivalent mark coal：(35212522272kJ/a)/7000 × 4.18=120.34t marks coal
(2) cold reclaimed every year can reclaim condensate, and (the specific heat 4.2kJ/kg of water, condensate are down to 45 from 85 DEG C
℃)
(35212522272kJ/a)/4.2kJ/kg* (85-45)=209598t
210,000 tons of desalted water can be reclaimed every year.
(3) exhaust temperature is brought up to more than 40 DEG C, the security risk that can solve the icing of winter floss hole, improved simultaneously
CO diffusion velocity in emission, reduces CO flooring concentrations, eliminates the exceeded risks of CO around discharge drum.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (6)
1. a kind of processing method of low-temperature methanol washing tail-gas, including the step of water scrubber washing is carried out to the low-temperature methanol washing tail-gas
Suddenly, it is characterised in that the low-temperature methanol washing tail-gas after washing is exchanged heat as low-temperature receiver and condensed water and/or low level heat energy.
2. processing method according to claim 1, it is characterised in that the heat exchange is carried out in box-type heat exchanger.
3. processing method according to claim 2, it is characterised in that the box-type heat exchanger includes shell side and tube side, water
The low-temperature methanol washing tail-gas after washing walks the shell side, and the condensed water and/or low level heat energy walk the tube side.
4. processing method according to claim 3, it is characterised in that the tube side is wing formula heat exchanger tube.
5. processing method according to claim 3, it is characterised in that the tube side is multi-stage heat exchanger pipe, while to difference
The condensed water and/or low level heat energy exchanged heat.
6. processing method according to claim 1, it is characterised in that the low-temperature methanol washing tail-gas temperature after heat exchange carries
Rise to more than 45 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710699401.4A CN107626184A (en) | 2017-08-15 | 2017-08-15 | A kind of processing method of low-temperature methanol washing tail-gas |
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| CN201710699401.4A CN107626184A (en) | 2017-08-15 | 2017-08-15 | A kind of processing method of low-temperature methanol washing tail-gas |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106268191A (en) * | 2016-09-13 | 2017-01-04 | 中国天辰工程有限公司 | A kind of low-temperature methanol washing tail-gas water washing device and process thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106268191A (en) * | 2016-09-13 | 2017-01-04 | 中国天辰工程有限公司 | A kind of low-temperature methanol washing tail-gas water washing device and process thereof |
Non-Patent Citations (2)
| Title |
|---|
| 李月红: "《化工原理》", 31 March 2016, 中国环境出版社 * |
| 邹广严: "《能源大辞典》", 31 January 1997, 四川科学技术出版社 * |
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Application publication date: 20180126 |