CN201665640U - Methanol process purge gas energy recovery device and methanol process system - Google Patents
Methanol process purge gas energy recovery device and methanol process system Download PDFInfo
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- CN201665640U CN201665640U CN2010201304355U CN201020130435U CN201665640U CN 201665640 U CN201665640 U CN 201665640U CN 2010201304355 U CN2010201304355 U CN 2010201304355U CN 201020130435 U CN201020130435 U CN 201020130435U CN 201665640 U CN201665640 U CN 201665640U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
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Abstract
The utility model discloses a methanol process purge gas energy recovery device and a methanol process system. The methanol process purge gas energy recovery device comprises a first-order expansion machine, a first generator and a first heat exchanger. The first generator is connected with the first-order expansion machine, and the gas outlet of the first-order expansion machine is connected with the cold fluid inlet of the first heat exchanger. The methanol process system comprises a synthetic tower, a methanol gathering tank, a methanol washing tank and a rectification unit and also comprises the methanol process purge gas energy recovery device, wherein the methanol process purge gas energy recovery device is connected with the purge gas outlet of the methanol washing tank. In the utility model, the reducing valve of the high-pressure purge gas of the original methanol process system is canceled, and the energy of the high-pressure purge gas is recovered, and thereby, the high-pressure energy of the purge gas can be sufficiently used, the energy consumption of the methanol device is reduced and the popularization and the utilization of a novel energy-saving process are promoted.
Description
Technical field
The utility model relates to a kind of methanol technics speed to exit energy recycle device and methanol technics system.
Background technology
Methyl alcohol is purposes basic Organic Chemicals very widely, accounts for the 4th in large industrial chemicals market, the world, is only second to ethene, propylene and benzene.Present large-scale methanol device all adopts the mesohigh method to produce methyl alcohol, still be that coal prepares methyl alcohol by Sweet natural gas, acetylene tail gas, coke(oven)gas no matter, all exist high pressure to speed to exit problem that decompression discharges.
The compressed synthetic tower catalyzed reaction that enters of the unstripped gas of synthesizing methanol, the part material solid/liquid/gas reactions generates methyl alcohol, and the methyl alcohol gas one of unreacted raw material and generation enters the methyl alcohol holding tank after tripping out synthetic tower process multi-stage heat exchanger, the thick methyl alcohol of methyl alcohol holding tank bottom is sent to rectification cell, the gas at methyl alcohol holding tank top, a part is back to synthetic tower, another part then enters the methanol wash jar and washs, collect contained methyl alcohol in the gas once more, the thick methyl alcohol of methanol wash pot bottom is sent to rectification cell, and the gas of methanol wash tank top is then handled as off-gas.The processing of speeding to exit mainly is divided into two kinds, and a kind of is to exit speeding through hydrogen gas recovering device recovery available gas hydrogen wherein, speeds to put afterwards after the reducing valve decompression; Another kind method is to speed venting directly after reducing valve decompression, to send into and transform the fuel gas of workshop section as converter.Certainly, also existing in the prior art will speed to exit extracts the processing means of small portion as the reducing gas of hydrogenating desulfurization out, but the most venting of speeding is still handled equally with preceding method for its residue.
All need in two kinds of treatment processs of methanol technics to off-gas at present the high pressure off-gas by reducing valve decompression back fed downstream operation, the pressure of off-gas is decompressed to 0.3MPa～3MPa by 7.5～11MPa usually and handles, has caused the waste of a large amount of high pressure potential energy thus.Along with expanding economy, country is to the attention of chemical industry energy-saving and emission-reduction, energy-saving and cost-reducingly becomes the problem that petroleum chemical industry is paid close attention to the most gradually, and the energy that how to utilize off-gas also is methanol device one of the problem demanding prompt solution that cuts down the consumption of energy.
The utility model content
The technical problems to be solved in the utility model is the methanol technics high pressure is speeded to exit to cause the defective of a large amount of high pressure potential energy wastes by the reducing valve decompression in order to overcome prior art, and a kind of methanol technics speed to exit energy recycle device and methanol technics system are provided.
The utility model solves above-mentioned technical problem by following technical proposals: a kind of methanol technics energy recycle device of exitting of speeding, it comprises an one-level decompressor, one first generator and one first interchanger, this first generator links to each other with this one-level decompressor, and the pneumatic outlet of this one-level decompressor is connected with this first interchanger cold fluid inlet.Wherein, when this methanol technics speeds to exit energy recycle device when being applied to methanol technics, the gas inlet of this one-level decompressor is connected with the input channel of speeding to exit, and this first interchanger cold fluid outlet is connected with the discharge line of speeding to exit; This first interchanger can be used for making the off-gas temperature to reach the requirement of lower procedure.
Preferably, this methanol technics energy recycle device of speeding to exit also is provided with one second interchanger, and the cold fluid outlet of this second interchanger is connected with the gas inlet of this one-level decompressor.This second interchanger is arranged at before this one-level decompressor, and the gas temperature that can be used for raising and speed to exit makes it to reclaim high pressure potential energy fast by this one-level decompressor and generator.
Preferably, this methanol technics energy recycle device of speeding to exit also comprises a compound expansion machine, one second generator and one the 3rd interchanger, the gas inlet of this compound expansion machine is connected with this first interchanger cold fluid outlet, the pneumatic outlet of this compound expansion machine is connected with the 3rd interchanger cold fluid inlet, and this second generator is arranged on this compound expansion machine.The 3rd interchanger can be used for making the off-gas temperature to reach the requirement of lower procedure.
Wherein, preferably, the hot fluid passageway of this first interchanger, this second interchanger and the 3rd interchanger is connected further recovery heat energy with methanol technics waste heat recovery circulating line.
The utility model also relates to a kind of methanol technics system, it comprises synthetic tower, methyl alcohol holding tank, methanol wash jar and rectification cell, it also comprises the aforesaid methanol technics energy recycle device of exitting of speeding, and this methanol technics energy recycle device of speeding to exit is connected with the venting outlet of speeding of this methanol wash jar.
Preferably, this methanol technics system also comprises a hydrogen gas recovering device, and this hydrogen gas recovering device is arranged at this methanol wash jar and this methanol technics speeds to exit between the energy recycle device.
On the basis that meets art technology general knowledge, but each optimum condition arbitrary combination of above-mentioned technical characterictic obtains preferred embodiment of the present utility model.
Positive progressive effect of the present utility model is: the utility model provides a kind of methanol technics speed to exit energy recycle device and methanol technics system.This methanol technics energy recycle device of speeding to exit has been cancelled the reducing valve of former methyl alcohol process system high pressure off-gas, the energy of high pressure off-gas is reclaimed, can make full use of the high pressure energy of off-gas, reduce the energy consumption of methanol device, promote applying of new energy-saving process.
Description of drawings
Fig. 1 is the methanol technics of the utility model embodiment 1 energy recycle device structural representation of speeding to exit.
Fig. 2 is the methanol technics of the utility model embodiment 2 energy recycle device structural representation of speeding to exit.
Fig. 3 is the methanol technics of the utility model embodiment 3 energy recycle device structural representation of speeding to exit.
Fig. 4 is the methanol technics system architecture synoptic diagram of the utility model embodiment 4.
Fig. 5 is the methanol technics system architecture synoptic diagram of the utility model embodiment 5.
Fig. 6 is the methanol technics system architecture synoptic diagram of the utility model embodiment 6.
Embodiment
Provide the utility model preferred embodiment below in conjunction with accompanying drawing, to describe the technical solution of the utility model in detail.
As shown in Figure 1, the utility model provides a kind of methanol technics energy recycle device of exitting of speeding, it comprises that one-level decompressor 1, first generator 2 and first interchanger, 3, the first generators 2 link to each other with one-level decompressor 1, and the pneumatic outlet of one-level decompressor 1 is connected with first interchanger, 3 cold fluids inlet.Wherein, when this methanol technics speeds to exit energy recycle device when being applied to methanol technics, the gas inlet of one-level decompressor 1 is connected with the input channel of speeding to exit, first interchanger, 3 cold fluids outlets is connected with the discharge line of speeding to exit, first interchanger, 3 hot fluid passageway can be connected with methanol technics waste heat recovery circulating line, further make full use of methanol technics used heat energy consumption thus and promote energy-conservation.
As shown in Figure 2, the utility model provides a kind of methanol technics energy recycle device of exitting of speeding, it comprises one-level decompressor 1, first generator 2, first interchanger 3 and second interchanger 4, the cold fluid outlet of second interchanger 4 is connected with the gas inlet of one-level decompressor 1, the pneumatic outlet of one-level decompressor 1 is connected with first interchanger, 3 cold fluids inlet, and first generator 2 links to each other with one-level decompressor 1.The gas temperature that is provided for raising and speeds to exit of second interchanger 4 makes it to reclaim the high pressure potential energy of speeding to exit fast by one-level decompressor 1 and generator 2.Wherein, when this methanol technics speeds to exit energy recycle device when being applied to methanol technics, the cold fluid of second interchanger 4 inlet is connected with the input channel of speeding to exit, first interchanger, 3 cold fluids outlets is connected with the discharge line of speeding to exit, first interchanger 3 can be connected with methanol technics waste heat recovery circulating line with the hot fluid passageway of second interchanger 4, further makes full use of methanol technics used heat energy consumption thus and promotes energy-conservation.
As shown in Figure 3, the utility model provides a kind of methanol technics energy recycle device of exitting of speeding, it comprises one-level decompressor 1, first generator 2, first interchanger 3, compound expansion machine 5, second generator 6 and the 3rd interchanger 7, the pneumatic outlet of one-level decompressor 1 is connected with first interchanger, 3 cold fluids inlet, first generator 2 links to each other with one-level decompressor 1, the outlet of first interchanger, 3 cold fluids is connected with the gas inlet of compound expansion machine 5, the pneumatic outlet of compound expansion machine 5 is connected with the 3rd interchanger 7 cold fluids inlet, and second generator 6 is arranged on the compound expansion machine 5.Wherein, when this methanol technics speeds to exit energy recycle device when being applied to methanol technics, the gas inlet of one-level decompressor 1 is connected with the input channel of speeding to exit, the 3rd interchanger 7 cold fluids outlets is connected with the discharge line of speeding to exit, first interchanger 3 can be connected with methanol technics waste heat recovery circulating line with the hot fluid passageway of the 3rd interchanger 7, further makes full use of methanol technics used heat energy consumption thus and promotes energy-conservation.
As shown in Figure 4, the utility model provides a kind of methanol technics system, it comprises synthetic tower 8, methyl alcohol holding tank 9, rectification cell 10, methanol wash jar 11, hydrogen gas recovering device 12, hydrogen collector unit 13 and the embodiment 3 described methanol technics energy recycle device of exitting of speeding, and this methanol technics energy recycle device of speeding to exit is connected with the venting outlet of speeding of this hydrogen gas recovering device 12.
As shown in Figure 5, the utility model provides a kind of methanol technics system, it comprises synthetic tower 8, methyl alcohol holding tank 9, rectification cell 10, methanol wash jar 11 and the embodiment 3 described methanol technics energy recycle device of exitting of speeding, and this methanol technics energy recycle device of speeding to exit is connected with the venting outlet of speeding of this methanol wash jar 11.
As shown in Figure 6, the utility model provides a kind of methanol technics system, it comprises synthetic tower 8, methyl alcohol holding tank 9, rectification cell 10, methanol wash jar 11 and the embodiment 2 described methanol technics energy recycle device of exitting of speeding, and this methanol technics energy recycle device of speeding to exit is connected with the venting outlet of speeding of this methanol wash jar 11.
Effect embodiment
For investigating the utility model methanol technics speed to exit effect of energy recycle device, be applied in the methanol technics with the methanol technics of embodiment 3 energy recycle device of speeding to exit, the methanol technics system that promptly forms embodiment 5 investigates, the pressure of general off-gas is 7.5～11MPa, after entering one-level decompressor 1, the high pressure off-gas can be decompressed to 3.5～5.8MPa, the off-gas temperature that goes out one-level decompressor 1 is at-20～40 ℃, after first interchanger, 3 heat exchange to 60～120 ℃, enter compound expansion machine 5, the gas outlet pressure of compound expansion machine 5 is 0.5MPa～3MPa, temperature is-20～10 ℃, reclaims methanol technics used heat through the 3rd interchanger 7 again and will speed to be sent to subsequent handling after discharge temperature rises to suitable temp; Wherein, the mechanical energy that one-level decompressor 1 reclaims is converted into electric energy through first generator 2, and the mechanical energy that compound expansion machine 5 reclaims is converted into electric energy through second generator 6.
Simultaneously, also can utilize the methanol technics of embodiment 2 energy recycle device of speeding to exit is that the process system of embodiment 6 is investigated its effect, speed to exit be heated to 120～180 ℃ in advance through second interchanger 4, then by one-level decompressor 1, the blow off pressure of will speeding is reduced to 0.5MPa～3MPa, reclaims the methanol technics used heat through first interchanger 3 again and will speed to be sent to subsequent handling after discharge temperature rises to suitable temp; Wherein, the mechanical energy of one-level decompressor 1 recovery is converted into electric energy through first generator 2.
The methanol technics of embodiment 3 energy recycle device of speeding to exit is applied in the methanol technics, and the methanol technics system that promptly forms embodiment 4 investigates, the about 45600Nm of off-gas that is separated through hydrogen gas recovering device 12 by methanol technics
3/ h, pressure 7.79MPa, 180 ℃ of temperature, this off-gas logistics is estimated to be introduced to converter and is gone burning, but required pressure 0.15MPa only during burning considers on-way resistance and the about 0.15MPa of shock resistance, therefore the required pressure of sending satisfies and gets final product greater than 0.3MPa, according to traditional technology, this logistics is sent the battery limit (BL) after directly being depressurized to required pressure with reducing valve, and this has wasted very big energy.Pass through the utility model, now the off-gas logistics is introduced the device of embodiment 3, speed venting through one-level swelling agent 1, be depressurized to 2.9MPa, go out the stream temperature of speeding to exit behind the decompressor 1 and decrease, after first interchanger 3 is heated to about 150 ℃, enter compound expansion machine 5 afterwards, the pressure of compound expansion machine 5 of speeding to exit is 0.3MPa, guides to converter again and go burning to get final product after the 3rd interchanger 7 is warming up to suitable temp.Wherein, first interchanger 3,7 heat requirements of the 3rd interchanger provide by methanol technics used heat; Decompressor externally acting is converted into electric energy by generator.Main result parameter is as shown in the table:
| Sequence number | Symbol | Unit | The one-level decompressor | The compound expansion machine | Remarks |
| 1 | P 0 | MPa | 7.79 | 2.9 | The decompressor inlet pressure |
| 2 | t 0 | ℃ | 180 | 150 | The decompressor temperature in |
| 3 | Q | Nm 3/h | 45600 | 45600 | |
| 5 | Pex | MPa | 2.9 | 0.3 | The decompressor top hole pressure |
| 7 | NT | kW | 1307.87 | 2384.88 | Decompressor externally does work |
| 8 | ηT | ％ | 70 | 70 | Efficiency of expander |
By last table data as can be known: the total internal power 3692.7kW of decompressor, efficiency of generator is about 0.94, generated output 3471.1kW.Find out that thus by the utility model recoverable energy 3471.1kw, original directly step-down is compared, novel process will be far superior to former technology aspect energy-saving and cost-reducing.
Though more than described embodiment of the present utility model, it will be understood by those of skill in the art that these only illustrate, protection domain of the present utility model is limited by appended claims.Those skilled in the art can make numerous variations or modification to these embodiments under the prerequisite that does not deviate from principle of the present utility model and essence, but these changes and modification all fall into protection domain of the present utility model.
Claims (5)
1. methanol technics energy recycle device of exitting of speeding, it is characterized in that: it comprises an one-level decompressor, one first generator and one first interchanger, this first generator links to each other with this one-level decompressor, and the pneumatic outlet of this one-level decompressor is connected with this first interchanger cold fluid inlet.
2. the methanol technics as claimed in claim 1 energy recycle device of exitting of speeding is characterized in that: this methanol technics energy recycle device of speeding to exit also is provided with one second interchanger, and the cold fluid outlet of this second interchanger is connected with the gas inlet of this one-level decompressor.
3. the methanol technics as claimed in claim 1 energy recycle device of exitting of speeding, it is characterized in that: this methanol technics energy recycle device of speeding to exit also comprises a compound expansion machine, one second generator and one the 3rd interchanger, the gas inlet of this compound expansion machine is connected with this first interchanger cold fluid outlet, the pneumatic outlet of this compound expansion machine is connected with the 3rd interchanger cold fluid inlet, and this second generator is arranged on this compound expansion machine.
4. methanol technics system, it comprises synthetic tower, methyl alcohol holding tank, methanol wash jar and rectification cell, it is characterized in that: it also comprises as each described methanol technics of claim 1～3 energy recycle device of exitting of speeding, and this methanol technics energy recycle device of speeding to exit is connected with the venting outlet of speeding of this methanol wash jar.
5. methanol technics as claimed in claim 4 system, it is characterized in that: it also comprises a hydrogen gas recovering device, this hydrogen gas recovering device is arranged at this methanol wash jar and this methanol technics speeds to exit between the energy recycle device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201304355U CN201665640U (en) | 2010-03-12 | 2010-03-12 | Methanol process purge gas energy recovery device and methanol process system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201304355U CN201665640U (en) | 2010-03-12 | 2010-03-12 | Methanol process purge gas energy recovery device and methanol process system |
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| CN201665640U true CN201665640U (en) | 2010-12-08 |
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| CN2010201304355U Expired - Fee Related CN201665640U (en) | 2010-03-12 | 2010-03-12 | Methanol process purge gas energy recovery device and methanol process system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105330514A (en) * | 2015-10-12 | 2016-02-17 | 天津衡创工大现代塔器技术有限公司 | Purification process for preparation of ethylene glycol from synthesis gas |
| CN108223032A (en) * | 2016-12-22 | 2018-06-29 | 朱琳 | A kind of recoverable system of methanol purge gas pressure and process |
-
2010
- 2010-03-12 CN CN2010201304355U patent/CN201665640U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105330514A (en) * | 2015-10-12 | 2016-02-17 | 天津衡创工大现代塔器技术有限公司 | Purification process for preparation of ethylene glycol from synthesis gas |
| CN108223032A (en) * | 2016-12-22 | 2018-06-29 | 朱琳 | A kind of recoverable system of methanol purge gas pressure and process |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101208 Termination date: 20130312 |