CN214407114U - Methanol synthesis reactor outlet gas heat recycling system - Google Patents
Methanol synthesis reactor outlet gas heat recycling system Download PDFInfo
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- CN214407114U CN214407114U CN202023311535.0U CN202023311535U CN214407114U CN 214407114 U CN214407114 U CN 214407114U CN 202023311535 U CN202023311535 U CN 202023311535U CN 214407114 U CN214407114 U CN 214407114U
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Abstract
The utility model relates to a methanol synthesis reactor export gas heat recovery utilizes system, including synthetic tower, business turn over material heat exchanger, low temperature hot water pre-heater, air cooler, water cooler and methyl alcohol separator. After passing through a synthesis loop feeding and discharging heat exchanger, a low-temperature hot water preheater is added by utilizing outlet reaction heat, a certain amount of low-temperature hot water is preheated to 95 ℃ from 70 ℃ and then is sent to a whole plant hot water pipe network system for users to use, the gas after primary cooling sequentially enters a crude methanol air cooler and a crude methanol adjusting water cooler, and after being cooled to 45 ℃, the gas enters a crude methanol separator for gas-liquid separation. The problem that the temperature of gas at the outlet of the reactor needs to be reduced to a temperature which can effectively separate methanol and is required to be less than 45 ℃ is solved, and meanwhile, a corresponding amount of low-temperature hot water is heated and is increased to a corresponding temperature. The system can reduce the power consumption of the air cooler and the circulating water consumption of the water cooler, recover heat, save resources and protect the environment.
Description
Technical Field
The utility model relates to a petrochemical technical field especially relates to a methanol synthesis reactor export gas heat recovery utilizes system.
Background
The temperature of the gas at the outlet of the synthesis reactor under the normal condition of the methanol synthesis device is 225-260 ℃, the temperature is 128 ℃ after the heat exchange with the mixed gas at the inlet through the feeding and discharging heat exchanger of the synthesis loop, then the gas sequentially enters a crude methanol air cooler (the temperature of the outlet air cooler is about 60 ℃) and a crude methanol adjusting water cooler, and the gas is cooled to be less than 45 ℃ and then enters a crude methanol separator for gas-liquid separation. The process air cooler and the water cooler have large consumption of electricity and circulating water in a synthesis loop, waste heat is wasted, and the process air cooler and the water cooler are not environment-friendly. Therefore, the system for recycling the heat of the gas at the outlet of the methanol synthesis reactor is of great significance.
Disclosure of Invention
Based on above technical problem, the utility model provides a methanol synthesis reactor export gas heat recovery utilizes system, reducible heat waste reduces the energy consumption.
The utility model discloses a technical means as follows:
a methanol synthesis reactor outlet gas heat recycling system comprises a synthesis tower, a feeding and discharging heat exchanger, a low-temperature hot water preheater, an air cooler, a crude methanol adjusting water cooler and a methanol separator;
the outlet of the bottom of the synthesis tower is connected with the inlet I of the feeding and discharging heat exchanger, the outlet I of the feeding and discharging heat exchanger is connected with the inlet of the low-temperature hot water preheater, the outlet of the low-temperature hot water preheater is connected with the inlet of the air cooler, the outlet of the air cooler is connected with the inlet of the crude methanol adjusting water cooler, the outlet of the crude methanol adjusting water cooler is connected with the inlet of the methanol separator, and the bottom of the methanol separator is provided with a crude alcohol outlet;
and a circulating gas outlet at the top of the methanol separator is connected with a feeding and discharging heat exchanger inlet II, and a feeding and discharging heat exchanger outlet II is connected with an inlet at the top of the synthesis tower.
Furthermore, an inlet II of the feeding and discharging heat exchanger is connected with a fresh air inlet pipeline.
Furthermore, the synthesis tower, the feeding and discharging heat exchanger, the low-temperature hot water preheater, the air cooler, the crude methanol adjusting water cooler and the methanol separator are connected through pipelines.
Furthermore, the synthesis tower is a shell-and-tube reactor, a catalyst is filled in a tube side, boiler water is filled in a shell side, and the synthesis gas generates methanol under the action of the catalyst.
Further, the feeding and discharging heat exchanger and the low-temperature hot water preheater are shell-and-tube heat exchangers; the inlet I and the outlet I of the charging and discharging heat exchanger correspond to tube passes, and the inlet II and the outlet II of the charging and discharging heat exchanger correspond to shell passes; the low-temperature hot water preheater exchanges heat between low-temperature hot water and tower outlet gas, the shell pass is internally communicated with the low-temperature hot water at 70 ℃, and the tube pass is internally communicated with the high-temperature tower outlet gas conveyed from the outlet I of the feeding and discharging heat exchanger.
Compared with the prior art, the invention has the following advantages:
(1) after passing through a synthesis loop feeding and discharging heat exchanger, a low-temperature hot water preheater is added by utilizing outlet reaction heat, a certain amount of low-temperature hot water is preheated to 95 ℃ from 70 ℃ and then is sent to a whole plant hot water pipe network system for users to use, after the gas is initially cooled, the gas sequentially enters an air cooler and a crude methanol regulating water cooler, and after the gas is cooled to 45 ℃, the gas enters a crude methanol separator for gas-liquid separation. The problem that the temperature of gas at the outlet of the reactor needs to be reduced to a temperature which can effectively separate methanol and requires less than 45 ℃ is solved, and meanwhile, a corresponding amount of low-temperature hot water is heated and increased to a corresponding temperature, so that heat is recycled.
(2) After passing through the low-temperature hot water preheater, the high-temperature gas enters the air cooler and the crude methanol adjusting water cooler at lower temperature, so that the power consumption of the air cooler and the circulating water consumption of the water cooler can be reduced, resources are saved, and the environment is protected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a recycling system according to the present application.
Detailed Description
The technical solution of the present application is described in detail by the following examples.
As shown in the figure, the system for recycling the heat of the gas at the outlet of the methanol synthesis reactor comprises a synthesis tower, a feeding and discharging heat exchanger, a low-temperature hot water preheater, an air cooler, a crude methanol adjusting water cooler and a methanol separator, wherein all the devices are connected through pipelines; the synthesis tower, the feeding and discharging heat exchanger and the low-temperature hot water preheater are all shell-and-tube devices;
the outlet of the bottom of the synthesis tower is connected with the inlet I of the feeding and discharging heat exchanger, the outlet I of the feeding and discharging heat exchanger is connected with the inlet of the low-temperature hot water preheater, the outlet of the low-temperature hot water preheater is connected with the inlet of the air cooler, the outlet of the air cooler is connected with the inlet of the crude methanol adjusting water cooler, the outlet of the crude methanol adjusting water cooler is connected with the inlet of the methanol separator, and the bottom of the methanol separator is provided with a crude alcohol outlet; an outlet at the top of the methanol separator is connected with an inlet II of the feed and discharge heat exchanger, and an outlet II of the feed and discharge heat exchanger is connected with an inlet at the top of the synthesis tower; and the inlet II of the feeding and discharging heat exchanger is also connected with a fresh gas inlet pipeline.
The mixed gas of the methanol synthesized at the outlet part of the methanol synthesis tower firstly passes through a feeding and discharging heat exchanger of a synthesis loop, after the heat exchange between the outlet gas and the inlet synthesis gas, the outlet gas sequentially enters a low-temperature hot water preheater, a crude methanol air cooler and a crude methanol water cooler, after being cooled to 45 ℃, the outlet gas enters a crude methanol separator for gas-liquid separation, and the outlet at the bottom of the methanol separator obtains crude methanol. The tower outlet gas enters from an inlet I of the feeding and discharging heat exchanger, flows out from an outlet I of the feeding and discharging heat exchanger and then enters the low-temperature hot water preheater; the inlet synthesis gas comprises fresh gas and recycle gas; the circulating gas flows out from a circulating gas outlet at the top of the methanol separator, enters from an inlet II of the feeding and discharging heat exchanger after being conveyed by a pipeline, and enters the top of the methanol synthesis tower after flowing out from an outlet II of the feeding and discharging heat exchanger; fresh gas enters from an inlet II of the feed and discharge heat exchanger, flows out from an outlet II of the feed and discharge heat exchanger and enters the top of the methanol synthesis tower; and the hot water after heat exchange by the low-temperature hot water preheater is sent to a hot water pipe network system of the whole plant for users to use.
The flow rate of the methanol synthesis tower outlet gas is 1600827Nm3The temperature is 249 ℃, the pressure is 8.5MPa, the temperature is 128 ℃ after passing through a charging and discharging heat exchanger, and if the temperature is directly cooled to be less than 45 ℃ in an air cooler and a crude methanol adjusting water cooler according to the original flow, the total power consumption of the air cooler is 112.5 MW; if the tower gas is discharged from the tower and enters a low-temperature hot water preheater, an air cooler and a coarse methanol adjusting water cooler in sequence after heat exchange of a feeding and discharging heat exchanger to be cooled to be less than 45 ℃, and the temperature of the gas at the outlet of the low-temperature hot water preheater (namely the inlet of the air cooler) is 80 ℃, the total power consumption of the air cooler is 33MW, and simultaneously, the tower gas can be used for exchanging heat for 4000 m/hour3The hot water at 70 ℃ is preheated to 95 ℃, and the heat is recovered, thereby greatly reducing the energy loss.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. The utility model provides a methyl alcohol synthesis reactor export gas heat recovery utilizes system which characterized in that: the system comprises a synthesis tower, a feeding and discharging heat exchanger, a low-temperature hot water preheater, an air cooler, a crude methanol adjusting water cooler and a methanol separator;
the bottom outlet of the synthesis tower is connected with an inlet I of a feed and discharge heat exchanger, the outlet I of the feed and discharge heat exchanger is connected with an inlet of a low-temperature hot water preheater, the outlet of the low-temperature hot water preheater is connected with an inlet of an air cooler, the outlet of the air cooler is connected with an inlet of a crude methanol adjusting water cooler, the outlet of the crude methanol adjusting water cooler is connected with an inlet of a methanol separator, and the bottom of the methanol separator is provided with a crude alcohol outlet;
and a circulating gas outlet at the top of the methanol separator is connected with a feeding and discharging heat exchanger inlet II, and an outlet II of the feeding and discharging heat exchanger is connected with an inlet at the top of the synthesis tower.
2. The system of claim 1, wherein: and an inlet II of the feeding and discharging heat exchanger is connected with a fresh gas inlet pipeline.
3. The system of claim 1, wherein: the synthesis tower is a shell-and-tube reactor, a catalyst is filled in a tube pass, and boiler water is introduced in a shell pass.
4. The system of claim 1, wherein: the feeding and discharging heat exchanger and the low-temperature hot water preheater are shell-and-tube heat exchangers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023311535.0U CN214407114U (en) | 2020-12-31 | 2020-12-31 | Methanol synthesis reactor outlet gas heat recycling system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023311535.0U CN214407114U (en) | 2020-12-31 | 2020-12-31 | Methanol synthesis reactor outlet gas heat recycling system |
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| CN214407114U true CN214407114U (en) | 2021-10-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899235A (en) * | 2021-12-07 | 2022-01-07 | 菲德克（天津）环保科技有限公司 | Kitchen waste pretreatment waste heat recycling method and recycling system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899235A (en) * | 2021-12-07 | 2022-01-07 | 菲德克（天津）环保科技有限公司 | Kitchen waste pretreatment waste heat recycling method and recycling system |
| CN113899235B (en) * | 2021-12-07 | 2022-03-01 | 菲德克（天津）环保科技有限公司 | Kitchen waste pretreatment waste heat recycling method and recycling system |
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