CN217813742U - Residual pressure energy-saving power generation system suitable for methanol synthesis process - Google Patents
Residual pressure energy-saving power generation system suitable for methanol synthesis process Download PDFInfo
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- CN217813742U CN217813742U CN202221231670.0U CN202221231670U CN217813742U CN 217813742 U CN217813742 U CN 217813742U CN 202221231670 U CN202221231670 U CN 202221231670U CN 217813742 U CN217813742 U CN 217813742U
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Abstract
The utility model relates to an excess pressure energy-saving power generation system suitable for among methyl alcohol synthesis technology, including two sets of high pressure thick methyl alcohol separators, filter, thick methyl alcohol flash tanks, still including setting up the hydraulic turbine between two sets of high pressure thick methyl alcohol separators and thick methyl alcohol flash tanks, hydraulic turbine drive generator electricity generation is incorporated into the power networks. A liquid level adjusting bypass of the high-pressure crude methanol separator is arranged at the inlet end and the outlet end of the hydraulic turbine so as to stabilize the liquid level of the high-pressure crude methanol separator. The hydraulic turbine generator set is arranged on the two high-pressure liquid-phase crude methanol streams, so that the effect of recovering the pressure energy of the high-pressure crude methanol is achieved, the power consumption of production and operation is saved, the purpose of economy and energy conservation is realized, meanwhile, the hydraulic turbine recovers the pressure energy of the two high-pressure liquid-phase crude methanol streams, the installation size is saved, the investment is reduced, and the equipment operation and maintenance cost is reduced.
Description
Technical Field
The utility model relates to an excess pressure energy-saving power generation system suitable for methanol synthesis technology.
Background
The industrial methanol isFrom CO + H 2 The synthesis gas is subjected to synthesis reaction under certain temperature and pressure and under the action of a catalyst to produce crude methanol, and the crude methanol after the synthesis reaction is further rectified to obtain industrial methanol with certain purity. The existing methanol synthesis reactions are all in>The method is characterized in that the method is carried out under the high pressure of 5MPa, the stream which is discharged from the synthesis tower and subjected to heat exchange through a heat exchanger separates crude methanol from unreacted gas in a high-pressure crude methanol separator, the separated high-pressure liquid-phase crude methanol is reduced to a low-pressure crude methanol flash tank through a pressure reducing valve, most of the byproducts such as gas (ketone and aldehyde) dissolved in the crude methanol are flashed from the liquid-phase methanol in the flash tank to be separated from the crude methanol, the flash steam is discharged from the top of the crude methanol flash tank, and the liquid-phase crude methanol is sent to a subsequent working section for further methanol rectification. The stream flowing through the pressure reducing valve has the characteristics of high gas content and combustible gas contained in flash steam, so that the pressure in the stream in the current domestic methanol synthesis plant can not be recycled, and energy loss is caused.
In a chinese patent "methanol synthesis process and methanol synthesis system" with an authorization publication number of CN103373898B (application number of 201210119479.1), it is mentioned that a hydraulic turbine is installed between a methanol high-pressure separator and a flash tank in the methanol synthesis process to recover pressure energy contained in high-pressure methanol, and mechanical energy output by the hydraulic turbine is consumed in three ways: the water pump 1 drives a generator to generate power, the water pump 2 drives a boiler to work, and the water pump 3 drives an asynchronous motor through a clutch. A hydraulic turbine bypass is not installed, the liquid level of the methanol high-pressure separator is adjusted through an adjusting valve installed on a hydraulic turbine inlet pipeline, and therefore the change of the adjusting valve on the hydraulic turbine inlet pipeline can cause the change of the working condition of the hydraulic turbine, and the stable operation of the hydraulic turbine is not facilitated.
According to the construction requirements of the existing methanol synthesis device which are larger and larger in scale, from the consideration of the single-tower capacity and the safety and stability of the methanol synthesis tower, most enterprises adopt two methanol synthesis towers which are arranged in parallel to match, the construction requirements that two strands of high-pressure crude methanol in a set of methanol synthesis device need to be recycled appear, and according to the content described in the Chinese patent invention of methanol synthesis process and methanol synthesis system with the authorization publication number of CN103373898B (with the application number of 201210119479.1), two hydraulic turbines are needed to recycle the pressure energy contained in the two strands of high-pressure crude methanol.
To the above problem, the utility model provides an adopt a hydraulic turbine to retrieve the pressure energy that the thick methyl alcohol of above-mentioned two strands of high pressures contains to import and export at hydraulic turbine and set up two big one little bypasses, a load condition for under the difference, adjust methyl alcohol high pressure separator's liquid level, no longer use the regulating valve on the hydraulic turbine import pipeline to adjust methyl alcohol high pressure separator, the governing valve position on the hydraulic turbine import pipeline keeps unchangeable basically during operation, so keep hydraulic turbine flow unchangeable basically, be favorable to hydraulic turbine steady operation.
SUMMERY OF THE UTILITY MODEL
The utility model discloses all technical problems solved provide a recovery utilization high pressure thick methanol pressure ability's that can be more high-efficient, safer and more reliable, more save investment cost excess pressure energy-conserving power generation system that is applicable to among the methyl alcohol synthesis technology to above-mentioned prior art.
The utility model adopts the technical proposal that: a residual pressure energy-saving power generation system suitable for a methanol synthesis process comprises a first high-pressure crude methanol separator, a high-pressure crude methanol separator and a hydraulic turbine;
the liquid phase outlet of the first high-pressure crude methanol separator is connected with a first inlet of a hydraulic turbine through a first pipeline, and the liquid phase outlet of the second high-pressure crude methanol separator is connected with a second inlet of the hydraulic turbine through a second pipeline; a first outlet of the hydraulic turbine is connected with an inlet of the crude methanol flash tank through a third pipeline, and a second outlet of the hydraulic turbine is connected with an inlet of the crude methanol flash tank through a fourth pipeline;
the first pipeline and the third pipeline are connected through a first pressure reducing bypass pipeline and a second pressure reducing bypass pipeline; a first pressure reducing regulating valve is arranged on the first pressure reducing bypass pipeline, and a second pressure reducing regulating valve is arranged on the second pressure reducing bypass pipeline;
the second pipeline and the fourth pipeline are connected through a third pressure reduction bypass pipeline and a fourth pressure reduction bypass pipeline; and a third pressure reducing regulating valve is arranged on the third pressure reducing bypass pipeline, and a fourth pressure reducing regulating valve is arranged on the fourth pressure reducing bypass pipeline.
Furthermore, a first filter is arranged at one end of the first pipeline close to the first high-pressure crude methanol separator.
Furthermore, a second filter is arranged at one end, close to the second high-pressure crude methanol separator, of the second pipeline.
Furthermore, a first regulating valve is arranged at one end of the first pipeline, which is close to the first inlet of the hydraulic turbine.
Furthermore, a second regulating valve is arranged at one end of the second pipeline, which is close to the second inlet of the hydraulic turbine.
Further, the output shaft of the hydraulic turbine is connected with a generator.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses in through set up a hydraulic turbine between two sets of thick methyl alcohol separators of high pressure and thick methyl alcohol flash tanks, can retrieve the pressure energy of the thick methyl alcohol stream of two strands of high-pressure liquid phases, the direct drive generator electricity generation is incorporated into the power networks, saves production operation power consumption, realizes economic energy-conserving purpose. And two regulating bypasses are arranged at one inlet end and one outlet end of the hydraulic turbine so as to meet the requirement of regulating the liquid level of the high-pressure crude methanol separator under two working conditions of operating the hydraulic turbine and not operating the hydraulic turbine.
Drawings
FIG. 1 is a schematic diagram of an excess pressure energy-saving power generation system suitable for use in a methanol synthesis process according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an excess pressure energy-saving power generation system suitable for use in a methanol synthesis process according to another embodiment of the present invention;
wherein:
the system comprises a first separator inlet 1, a first high-pressure crude methanol separator 2, a first filter 3, a first pressure reducing regulating valve 4, a second pressure reducing regulating valve 5, a first regulating valve 6, a hydraulic turbine 7, a crude methanol flash tank 8, a second separator inlet 9, a second high-pressure crude methanol separator 10, a second filter 11, a third pressure reducing regulating valve 12, a fourth pressure reducing regulating valve 13, a second regulating valve 14, a first gas phase outlet pipeline 15, a second gas phase outlet pipeline 16, a gas phase flash tank outlet pipeline 17, a liquid phase flash tank outlet pipeline 18, a first pipeline 19, a second pipeline 20, a third pipeline 21, a fourth pipeline 22, a first pressure reducing bypass pipeline 23, a second pressure reducing bypass pipeline 24, a third pressure reducing bypass pipeline 25 and a fourth pressure reducing bypass pipeline 26.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments; in the drawings or the description, the same reference numerals are used for similar or identical parts, and the shape, thickness, or height of each part may be enlarged or reduced in practical use. The embodiments of the present invention are provided only for illustration and not for limiting the scope of the present invention. Any obvious and obvious modifications or alterations to the present invention can be made without departing from the spirit and scope of the present invention.
The present invention will be described in further detail with reference to the following embodiments. As shown in fig. 1 and fig. 2, the excess pressure energy-saving power generation system suitable for the methanol synthesis process in the present embodiment includes a first high-pressure crude methanol separator 2, a second high-pressure crude methanol separator 10, and a hydraulic turbine 7;
the hydraulic turbine 7 has two inlets and two outlets, one inlet is connected with the liquid phase outlet of the first high-pressure crude methanol separator 2, the other inlet is connected with the liquid phase outlet of the second high-pressure crude methanol separator 10, and the two outlets are both connected with the inlet of the crude methanol flash tank 8;
a first separator inlet 1 of a first high-pressure crude methanol separator 2 and a second separator inlet 9 of a second high-pressure crude methanol separator 10 are connected with a pipeline of an upstream methanol synthesis tower outlet after heat exchange by a heat exchanger, and a first gas phase outlet pipeline 15 is arranged at the top of the first high-pressure crude methanol separator 2;
a second gas phase outlet pipeline 16 is arranged at the top of the second high-pressure crude methanol separator 10, and the first gas phase outlet pipeline 15 and the second gas phase outlet pipeline 16 are connected to the inlet of the circulating gas compressor;
the liquid phase outlet of the first high-pressure crude methanol separator 2 is connected to the first inlet of the hydraulic turbine 7 via a first line 19, and the outlet of the second high-pressure crude methanol separator 10 is connected to the second inlet of the hydraulic turbine 7 via a second line 20; a first outlet of the hydraulic turbine 7 is connected with an inlet of the crude methanol flash tank 8 through a third pipeline 21, and a second outlet of the hydraulic turbine 7 is connected with an inlet of the crude methanol flash tank 8 through a fourth pipeline 22;
in order to conveniently adjust the liquid levels of the first high-pressure crude methanol separator 2 and the second high-pressure crude methanol separator 10 at the upstream of the hydraulic turbine 7 so as to ensure the stability of the liquid levels, two pressure reduction bypass pipelines are arranged between each inlet pipeline and each outlet pipeline of the hydraulic turbine, one pressure reduction bypass pipeline is a full-flow bypass pressure reduction pipeline, and a full-flow adjusting valve is arranged on each pipeline; one is a small flow bypass pressure reducing pipeline which is provided with a small flow regulating valve.
The method comprises the following specific steps: the first pipeline 19 and the third pipeline 21 are connected through a first pressure reduction bypass pipeline 23 and a second pressure reduction bypass pipeline 24, and the first pressure reduction bypass pipeline 23 and the second pressure reduction bypass pipeline 24 are arranged side by side, so that the operation is convenient; the first pressure reduction bypass pipeline 23 is provided with a first pressure reduction regulating valve 4 for full-flow pressure reduction regulation; the second pressure reducing bypass pipeline 24 is provided with a second pressure reducing regulating valve 5 for small-flow pressure reducing regulation;
the second pipeline 20 is connected with the fourth pipeline 24 through a third pressure reduction bypass pipeline 25 and a fourth pressure reduction bypass pipeline 26, and the third pressure reduction bypass pipeline 25 and the fourth pressure reduction bypass pipeline 26 are arranged side by side, so that the operation is convenient; the third pressure reduction bypass pipeline 25 is provided with a third pressure reduction regulating valve 12 for full-flow pressure reduction regulation; the fourth pressure reduction bypass pipeline 26 is provided with a fourth pressure reduction regulating valve 13 for small-flow pressure reduction regulation;
when the hydraulic turbine 7 is not operated, the crude methanol flowing out of the first high-pressure crude methanol separator 2 flows into the crude methanol flash tank 8 through the first pressure reducing regulating valve 4 on the first pressure reducing bypass pipeline 23; when the hydraulic turbine 7 is in operation, the crude methanol flowing out of the first high-pressure crude methanol separator 2 flows into the crude methanol flash tank 8 through the second pressure reducing regulating valve 5 on the second pressure reducing bypass pipeline 24 and the pressure turbine 7;
the operation of the second high-pressure crude methanol separator 10 is the same as that of the first high-pressure crude methanol separator 2, and will not be described repeatedly.
Further, one end of the first pipeline 19 close to the first high-pressure crude methanol separator 2 is provided with a first filter 3; a second filter 11 is arranged at one end of the second pipeline 20 close to the second high-pressure crude methanol separator 10, and the first filter 3 and the second filter 11 are used for filtering impurities in the crude methanol.
Further, in order to conveniently adjust the flow of the high-pressure crude methanol entering the hydraulic turbine 7 and adjust the power generation grid-connected power of the hydraulic turbine set, a first inlet of the hydraulic turbine 7 is connected with an outlet of the first filter 3 through a first adjusting valve 6, and a second inlet of the hydraulic turbine 7 is connected with an outlet of the second filter 11 through a second adjusting valve 14; two outlets of the hydraulic turbine 7 are connected with an inlet of a crude methanol flash tank 8. In order to ensure a rapid and safe shut-down of the hydraulic turbine 7 in the event of an emergency stop, the first regulating valve 6 and the second regulating valve 14 should have a rapid shut-off function, or a rapid shut-off valve should be provided in front of the regulating valve in the inlet line of the hydraulic turbine 7.
Further, an output shaft of the hydraulic turbine is connected with a generator, a hydraulic turbine 7 is installed on the two high-pressure liquid-phase crude methanol streams to fully recover the pressure energy, and shaft power output after the hydraulic turbine 7 recovers the pressure energy drives the generator to generate electricity and is connected to the grid. The equipment quantity is small, the energy-saving effect is achieved, meanwhile, the investment is reduced, and the equipment operation and maintenance quantity is reduced.
The working engineering of the excess pressure energy-saving power generation system is as follows: crude methanol from an outlet of the upstream methanol synthesis tower after heat exchange enters a first high-pressure crude methanol separator 2 and a second high-pressure crude methanol separator 10 for gas-liquid separation, and gas-phase circulating gas is led out to a circulating gas compressor from a first gas-phase outlet pipeline 15 and a second gas-phase outlet pipeline 16 at the top; after impurities in a liquid phase are filtered by the first filter 3 and the second filter 11, the liquid phase enters the first pressure reducing regulating valve 4 and the second pressure reducing regulating valve 12 for pressure reduction and flows into the crude methanol flash tank 8 under the working condition that the hydraulic turbine 7 does not operate; most of the by-products such as gases (ketones and aldehydes) dissolved in the crude methanol are flashed from the liquid crude methanol in the crude methanol flash tank 8 to separate them from the crude methanol, the flashed vapor is discharged from the top flash tank vapor outlet line 17, and the liquid phase is passed from the bottom flash tank liquid outlet line 18 to be rectified for removing the crude methanol.
In the operation condition of the hydraulic turbine 7, the flow after filtering impurities by the first filter 3 and the second filter 11 is divided into two parts: one part of the methanol is decompressed by the second pressure reducing and regulating valve 5 and the fourth pressure reducing and regulating valve 13 and flows into the crude methanol flash tank 8, the other part of the methanol is sent to two inlets of the hydraulic turbine 7 through the first regulating valve 6 of the hydraulic turbine inlet and the second regulating valve 14 of the hydraulic turbine inlet, and the pressure energy is recovered by the hydraulic turbine 7 and then discharged into the crude methanol flash tank 8 through two outlets of the hydraulic turbine 7.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present disclosure, and all should be covered by the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (6)
1. The utility model provides an excess pressure energy-conserving power generation system suitable for among methyl alcohol synthesis technology which characterized in that: comprises a first high-pressure crude methanol separator (2), a second high-pressure crude methanol separator (10) and a hydraulic turbine (7),
the liquid phase outlet of the first high-pressure crude methanol separator (2) is connected with the first inlet of the hydraulic turbine (7) through a first pipeline (19), and the liquid phase outlet of the second high-pressure crude methanol separator (10) is connected with the second inlet of the hydraulic turbine (7) through a second pipeline (20); a first outlet of the hydraulic turbine (7) is connected with an inlet of the crude methanol flash tank (8) through a third pipeline (21), and a second outlet of the hydraulic turbine (7) is connected with an inlet of the crude methanol flash tank (8) through a fourth pipeline (22);
the first pipeline (19) and the third pipeline (21) are connected through a first decompression bypass pipeline (23) and a second decompression bypass pipeline (24); a first pressure reducing regulating valve (4) is arranged on the first pressure reducing bypass pipeline (23), and a second pressure reducing regulating valve (5) is arranged on the second pressure reducing bypass pipeline (24);
the second pipeline (20) and the fourth pipeline (22) are connected through a third pressure reduction bypass pipeline (25) and a fourth pressure reduction bypass pipeline (26); a third pressure reducing regulating valve (12) is arranged on the third pressure reducing bypass pipeline (25), and a fourth pressure reducing regulating valve (13) is arranged on the fourth pressure reducing bypass pipeline (26).
2. The excess pressure energy-saving power generation system suitable for the methanol synthesis process according to claim 1, characterized in that: one end of the first pipeline (19) close to the first high-pressure crude methanol separator (2) is provided with a first filter (3).
3. The excess pressure energy-saving power generation system suitable for the methanol synthesis process according to claim 1, characterized in that: and one end of the second pipeline (20) close to the second high-pressure crude methanol separator (10) is provided with a second filter (11).
4. The excess pressure energy-saving power generation system suitable for the methanol synthesis process according to claim 1, characterized in that: the first pipeline (19) is provided with a first regulating valve (6) close to one end of a first inlet of the hydraulic turbine (7).
5. The excess pressure energy-saving power generation system suitable for the methanol synthesis process according to claim 1, characterized in that: and a second regulating valve (14) is arranged at one end of the second pipeline (20) close to a second inlet of the hydraulic turbine (7).
6. The excess pressure energy-saving power generation system suitable for the methanol synthesis process according to claim 1, characterized in that: the output shaft of the hydraulic turbine (7) is connected with a generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221231670.0U CN217813742U (en) | 2022-05-19 | 2022-05-19 | Residual pressure energy-saving power generation system suitable for methanol synthesis process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221231670.0U CN217813742U (en) | 2022-05-19 | 2022-05-19 | Residual pressure energy-saving power generation system suitable for methanol synthesis process |
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| CN217813742U true CN217813742U (en) | 2022-11-15 |
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| CN202221231670.0U Active CN217813742U (en) | 2022-05-19 | 2022-05-19 | Residual pressure energy-saving power generation system suitable for methanol synthesis process |
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2022
- 2022-05-19 CN CN202221231670.0U patent/CN217813742U/en active Active
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