CN113058282B - Dimethyl ether production system with waste water heat utilization structure and use method thereof - Google Patents
Dimethyl ether production system with waste water heat utilization structure and use method thereof Download PDFInfo
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- CN113058282B CN113058282B CN202110328477.2A CN202110328477A CN113058282B CN 113058282 B CN113058282 B CN 113058282B CN 202110328477 A CN202110328477 A CN 202110328477A CN 113058282 B CN113058282 B CN 113058282B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/34—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping with one or more auxiliary substances
- B01D3/38—Steam distillation
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/01—Preparation of ethers
- C07C41/09—Preparation of ethers by dehydration of compounds containing hydroxy groups
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/01—Preparation of ethers
- C07C41/34—Separation; Purification; Stabilisation; Use of additives
- C07C41/40—Separation; Purification; Stabilisation; Use of additives by change of physical state, e.g. by crystallisation
- C07C41/42—Separation; Purification; Stabilisation; Use of additives by change of physical state, e.g. by crystallisation by distillation
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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
- Y02P20/10—Process efficiency
Abstract
The invention discloses a dimethyl ether production system with a waste water heat utilization structure and a use method thereof, wherein the system comprises a stripping tower, a stripping tower reboiler, a vaporization tower, a rectifying tower kettle liquid tank, a rectifying tower kettle liquid pump and a waste water cooler; a first stop valve is arranged on the pipeline between the rectifying tower liquid tank pump and the vaporizing tower, a first branch pipeline is communicated and arranged on the pipeline at the lower end of the first stop valve, and a second stop valve and a stripping tower tube pass inlet valve are arranged on the first branch pipeline; a pipeline at the upper end of the first stop valve is communicated with and provided with a second branch pipeline, and a third stop valve and a stripper tube side outlet valve are arranged on the second branch pipeline; the system enables the waste water in the vaporization tower and the tower bottom liquid of the rectification tower to exchange heat through the reboiler of the stripping tower, so that the temperature of the tower bottom liquid of the rectification tower is improved, and the steam usage amount of the vaporization tower is reduced; the temperature of the wastewater is reduced in the heat exchange process, the evaporation capacity of the circulating water is reduced after the wastewater enters the wastewater cooler, the use amount of the circulating water is saved, and the consumption of cooling water is reduced.
Description
Technical Field
The invention relates to the technical field of waste water utilization, in particular to a dimethyl ether production system with a waste water heat utilization structure and a using method thereof.
Background
At present, the production process of dimethyl ether is divided into a liquid phase methanol dehydration method, a gas phase methanol dehydration method and a synthesis gas one-step method. The gas phase methanol dehydration method is to generate dimethyl ether by dehydrating methanol on a modified gamma-alumina catalyst after the methanol is vaporized, and most of the existing industrial devices adopt the process. However, in the process production equipment, the wastewater of the vaporization tower enters a stripping tower, 1% of methanol in the wastewater is stripped and cooled and then is sent to the vaporization tower through a pump for recycling, namely, the wastewater of the vaporization tower enters a shell pass of a reboiler I of the stripping tower from a tower kettle of the vaporization tower, the wastewater enters the middle part of the stripping tower after exchanging heat with the kettle liquid of the stripping tower, and the stripped wastewater enters a shell pass of a wastewater cooler for cooling.
Disclosure of Invention
The invention aims to provide a dimethyl ether production system with a waste water heat utilization structure and a using method thereof, and aims to solve the problems that waste water heat is wasted in the existing dimethyl ether production process, and the consumption of circulating water for cooling waste water is increased.
In order to achieve the purpose, the invention adopts the following technical scheme:
a dimethyl ether production system with a waste water heat utilization structure comprises a stripping tower (1), a stripping tower reboiler (2), a vaporization tower (3), a rectifying tower kettle liquid tank (4), a rectifying tower kettle liquid pump (5) and a waste water cooler (6), wherein the rectifying tower kettle liquid tank (4) is connected with the rectifying tower kettle liquid pump (5) through a pipeline, and the rectifying tower kettle liquid pump (5) is connected with the vaporization tower (3) through a pipeline; a first stop valve (7) is arranged on the pipeline between the rectifying tower kettle liquid pump (5) and the vaporization tower (3), a first branch pipeline (8) is communicated and arranged on the pipeline at the lower end of the first stop valve (7), the other end of the first branch pipeline (8) is connected with a tube pass inlet of the stripping tower (1), a second stop valve (9) and a stripping tower tube pass inlet valve (10) are arranged on the first branch pipeline (8), and the stripping tower tube pass inlet valve (10) is arranged between the tube pass inlet of the stripping tower (1) and the second stop valve (9); a second branch pipeline (11) is communicated and installed on a pipeline at the upper end of the first stop valve (7), the other end of the second branch pipeline (11) is connected with a pipe side outlet of the stripping tower (1), a third stop valve (12) and a stripping tower pipe side outlet valve (13) are installed on the second branch pipeline (11), and the stripping tower pipe side outlet valve (13) is installed between the pipe side outlet of the stripping tower (1) and the third stop valve (12); the tube side inlet of the stripping tower reboiler (2) is connected with a pipeline between the second stop valve (9) and the stripping tower tube side inlet valve (10) through a pipeline; the tube side outlet of the stripping tower reboiler (2) is connected with a pipeline between the third stop valve (12) and the stripping tower tube side outlet valve (13) through a pipeline; the tube side outlet of the stripping tower (1) is connected with the shell side inlet of the wastewater cooler (6) through a pipeline; an outlet of the vaporization tower (3) is connected with a shell pass inlet of a reboiler (2) of the stripping tower through a pipeline; the shell pass outlet of the stripping tower reboiler (2) is connected with the shell pass inlet of the wastewater cooler (6) through a pipeline; the upper part of the stripping tower (1) is provided with a stripping tower feeding valve (14).
In the scheme, preferably, the first regulating valve (15) is connected to the pipeline between the rectifying tower kettle liquid pump (5) and the vaporization tower (3), and the first regulating valve (15) is positioned above the pipeline connecting point between the second branch pipeline (11) and the rectifying tower kettle liquid pump (5) and the vaporization tower (3).
It is also preferable that the first regulating valve (15) is connected to the thirty-second tray of the vaporization tower (3) through a pipe.
It may also be preferred that the first branch conduit (8) and the second branch conduit (11) are both DN50 conduits.
It is also preferred that the outlet of the waste water cooler (6) is connected to a biochemical treatment apparatus.
The application method of the dimethyl ether production system with the waste water heat utilization structure comprises the following steps:
closing a stripper tube side inlet valve (10), a stripper tube side outlet valve (13) and a stripper feed valve (14);
closing the first stop valve (7), opening the second stop valve (9) and opening the third stop valve (12);
the wastewater of the vaporization tower (3) enters the shell pass of a reboiler (2) of a stripping tower;
discharging the tower bottom liquid of the rectifying tower from a rectifying tower bottom liquid groove (4), wherein the tower bottom liquid of the rectifying tower enters a pipe pass of a stripping tower reboiler (2) through a rectifying tower bottom liquid pump (5) and a second stop valve (9);
the wastewater and the tower bottom liquid of the rectifying tower are subjected to heat exchange through a stripping tower reboiler (2);
flowing the wastewater from the stripper reboiler (2) shell side to a wastewater cooler (6);
and enabling the tower bottom liquid of the rectifying tower to enter the vaporizing tower (3) from the outlet of the tube side of the reboiler (2) of the stripping tower through a third stop valve (12).
In the scheme, the rectifying tower bottom liquid is preferably discharged from a tube side outlet of a stripping tower reboiler (2), enters a first regulating valve (15) through a third stop valve (12) and then enters the vaporizing tower (3).
It is also preferred that the first regulating valve (15) is regulated to control the flow of the rectification column bottoms into the vaporization column (3).
It may also be preferred that the rectification column bottoms enter the thirty-second tray of the vaporization column (3).
It may also be preferred to discharge the wastewater from the wastewater cooler (6) to a biochemical treatment facility.
The dimethyl ether production system with the waste water heat utilization structure and the use method thereof have the beneficial effects that:
the dimethyl ether production system with the waste water heat utilization structure and the use method thereof solve the problems that waste water heat is wasted in the dimethyl ether production process and the consumption of circulating water for cooling the waste water is increased in the prior art; the system enables the waste water in the vaporization tower and the tower bottom liquid of the rectification tower to exchange heat through the reboiler of the stripping tower, and the tower bottom liquid of the rectification tower enters the vaporization tower from the reboiler of the stripping tower, so that the temperature of the tower bottom liquid of the rectification tower is increased, and the steam usage amount of the vaporization tower is reduced; the temperature of the wastewater is reduced in the process of heat exchange of the tower bottom liquid of the rectifying tower, the evaporation capacity of circulating water is reduced after the wastewater enters a wastewater cooler, the use amount of the circulating water is saved, the consumption of cooling water is reduced, and the operation cost of the dimethyl ether production system is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic flow diagram of the dimethyl ether production system with a wastewater heat utilization structure of the present invention.
The arrow in the figure represents the liquid flow direction, 1 is the stripper, 2 is the stripper reboiler, 3 is the vaporization tower, 4 is the rectifying column cauldron cistern, 5 is the rectifying column cauldron liquid pump, 6 is the waste water cooler, 7 is first stop valve, 8 is first branch pipeline, 9 is the second stop valve, 10 is stripper tube side entry valve, 11 is the second branch pipeline, 12 is the third stop valve, 13 is stripper tube side exit valve, 14 is the stripper feed valve, 15 is first governing valve, 16 is the second governing valve, 17 is waste water cooler shell side entry stop valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
A dimethyl ether production system with a waste water heat utilization structure is shown in figure 1 and comprises a stripping tower 1, a stripping tower reboiler 2, a vaporization tower 3, a rectification tower kettle liquid tank 4, a rectification tower kettle liquid pump 5 and a waste water cooler 6, wherein the rectification tower kettle liquid tank 4 is connected with the rectification tower kettle liquid pump 5 through a pipeline, and the rectification tower kettle liquid pump 5 is connected with the vaporization tower 3 through a pipeline; a first stop valve 7 is arranged on the pipeline between the rectifying tower liquid kettle pump 5 and the vaporization tower 3, a first branch pipeline 8 is communicated and arranged on the pipeline at the lower end of the first stop valve 7, the other end of the first branch pipeline 8 is connected with a tube pass inlet of the stripping tower 1, a second stop valve 9 and a stripping tower tube pass inlet valve 10 are arranged on the first branch pipeline 8, and the stripping tower tube pass inlet valve 10 is arranged between the tube pass inlet of the stripping tower 1 and the second stop valve 9; a second branch pipeline 11 is communicated and installed on a pipeline at the upper end of the first stop valve 7, the other end of the second branch pipeline 11 is connected with a tube side outlet of the stripping tower 1, a third stop valve 12 and a stripping tower tube side outlet valve 13 are installed on the second branch pipeline 11, and the stripping tower tube side outlet valve 13 is installed between the tube side outlet of the stripping tower 1 and the third stop valve 12; the tube side inlet of the stripping tower reboiler 2 is connected with a pipeline between the second stop valve 9 and a stripping tower tube side inlet valve 10 through a pipeline; the tube side outlet of the stripping tower reboiler 2 is connected with a pipeline between a third stop valve 12 and a stripping tower tube side outlet valve 13 through a pipeline; the tube pass outlet of the stripping tower 1 is connected with the shell pass inlet of the wastewater cooler 6 through a pipeline; an outlet of the vaporization tower 3 is connected with a shell pass inlet of a reboiler 2 of the stripping tower through a pipeline; a shell pass outlet of the stripping tower reboiler 2 is connected with a shell pass inlet of the wastewater cooler 6 through a pipeline; stripper 1 is fitted at its upper part with stripper feed valve 14.
The connecting pipelines are all stainless steel pipes, so that the interior and the exterior of the pipelines are prevented from rusting and corroding; a first branch pipeline 8 is communicated and installed on a pipeline at the lower end of the first stop valve 7, and the connection position is connected in a welding mode or a tee joint mode; a pipeline at the upper end of the first stop valve 7 is communicated with and provided with a second branch pipeline 11, and the joint is connected in a welding mode or a tee joint mode; the tube pass inlet of the stripping tower reboiler 2 is connected with a pipeline between a second stop valve 9 and a stripping tower tube pass inlet valve 10 through a pipeline, and the connection part is connected in a welding mode or a tee joint mode; the tube pass outlet of the stripping tower reboiler 2 is connected with a pipeline between the third stop valve 12 and the stripping tower tube pass outlet valve 13 through a pipeline, and the joint is connected in a welding mode or in a tee joint mode.
The use method of the dimethyl ether production system with the waste water heat utilization structure comprises the following steps:
closing the stripper tube side inlet valve 10, stripper tube side outlet valve 13 and stripper feed valve 14;
the first stop valve 7 is closed, the second stop valve 9 is opened and the third stop valve 12 is opened;
the wastewater of the vaporization tower 3 enters the shell pass of a reboiler 2 of a stripping tower;
discharging the tower bottom liquid of the rectifying tower from a rectifying tower bottom liquid tank 4, wherein the tower bottom liquid of the rectifying tower enters a pipe pass of a stripping tower reboiler 2 through a rectifying tower bottom liquid pump 5 and a second stop valve 9;
the wastewater and the tower bottom liquid of the rectifying tower are subjected to heat exchange through a stripping tower reboiler 2;
flowing the wastewater from the stripper reboiler 2 shell side to a wastewater cooler 6;
and leading the tower bottom liquid of the rectifying tower to enter the vaporizing tower 3 from the outlet of the tube side of the reboiler 2 of the stripping tower through a third stop valve 12.
Wherein the content of the methanol in the tower bottom liquid of the rectifying tower can be 45 percent, the temperature of the tower bottom liquid of the rectifying tower is 130 ℃, and the flow rate is 15m 3/h; the temperature of the wastewater in the vaporization tower 3 is 185 ℃, the flow rate is 10m3/h, so that the wastewater and the tower bottom liquid of the rectification tower exchange heat through a stripping tower reboiler, the heat of the wastewater is recovered, the feeding temperature of the vaporization tower 3 is increased, and the steam consumption of the vaporization tower 3 is reduced; meanwhile, the temperature of the wastewater at the inlet of the wastewater cooler 6 is also reduced, and the consumption of circulating water is reduced.
Example 2
A dimethyl ether production system with a waste water heat utilization structure is shown in figure 1, which is similar to that in embodiment 1, except that in the scheme, preferably, a first regulating valve 15 is connected on a pipeline between a rectifying tower kettle liquid pump 5 and a vaporization tower 3, the first regulating valve 15 is positioned above a pipeline connecting point between a second branch pipeline 11 and the rectifying tower kettle liquid pump 5 and the vaporization tower 3, and the first regulating valve 15 regulates the flow of rectifying tower kettle liquid entering the vaporization tower 3, so that pipeline vibration can be effectively avoided.
It may also be preferable that the first regulating valve 15 is connected to the thirty-second-tier tray of the vaporization tower 3 through a pipe.
It is also preferable that the first branch pipeline 8 and the second branch pipeline 11 are both DN50 pipelines, so as to better meet the requirement of tower bottom liquid flow of the rectifying tower and avoid the pipelines from generating vibration.
It is also preferable that the outlet of the wastewater cooler 6 is connected to a biochemical treatment facility to avoid environmental pollution caused by wastewater.
It may also be preferred that a water pump is installed in the conduit between the tube-side outlet of the stripping column 1 and the shell-side inlet of the wastewater cooler 6 to pump the wastewater into the wastewater cooler 6 as soon as possible.
It may also be preferable that a second regulating valve 16 and a waste water cooler shell pass inlet stop valve 17 are installed on a pipeline between a shell pass outlet of the stripping tower reboiler 2 and a shell pass inlet of the waste water cooler 6, the waste water cooler shell pass inlet stop valve 17 is installed on a pipeline between the second regulating valve 16 and the shell pass inlet of the waste water cooler 6, and the second regulating valve 16 regulates the flow rate of waste water entering the waste water cooler 6, so as to better ensure that the stripping tower reboiler 2 performs heat exchange.
It may also be preferred that the second control valve 16 and the waste water cooler shell-side inlet stop valve 17 are connected by a conduit to the stripper column feed valve 14.
It is also preferable that the wastewater cooler 6 further comprises a circulating water inlet and a circulating water recycling outlet for the inlet and outlet of circulating water.
It is also preferable that both sides of the vaporization tower 3 are respectively installed with a vaporization tower reboiler, the vaporization tower reboiler is connected with the bottom outlet of the vaporization tower 3 and the lower vapor inlet of the vaporization tower 3 through pipes, and the vaporization tower reboiler heats the vaporization tower by using vapor to convert liquid methanol into gaseous methanol.
In the using method of the dimethyl ether production system with the wastewater heat utilization structure, the tower bottom liquid of the rectifying tower is discharged from the tube pass outlet of the reboiler 2 of the stripping tower, enters the first regulating valve 15 through the third stop valve 12, and then enters the vaporization tower 3; adjusting a first adjusting valve 15 to control the flow of the rectifying tower bottom liquid entering the vaporization tower 3; the rectifying tower bottoms enter a thirty-second layer of tower trays of the vaporization tower 3; adjusting the second regulating valve 16 controls the flow of wastewater into the wastewater cooler 6, discharging the wastewater from the wastewater cooler 6 to the biochemical treatment facility.
The dimethyl ether production system with the waste water heat utilization structure and the use method thereof have the advantages of simple equipment and convenience in operation; when the system is combined with a methanol device, crude methanol is used as a raw material, the proportion of two products of methanol and dimethyl ether can be adjusted, and the production cost can be greatly reduced; the system can also be connected with a reactor, the reactor is a multi-section cold shock type fixed bed, the catalyst filling capacity is large, the cost is low, the reaction temperature is proper, the side reaction is less, and the large-scale production is easy; the structure and the separation process of the vaporization tower 3 are used for vaporizing the methanol and recovering the unreacted methanol, so that the flow is simplified, the cost is low, and the steam consumption is effectively reduced; when the stripping tower reboiler 2 leaks, the first stop valve 7 is opened, the second stop valve 9 and the third stop valve 12 are closed through switching operation, the system can be prevented from stopping, the phenomenon that pipeline vibration is caused due to the fact that the flow of the rectifying tower kettle liquid is small and the stripping tower reboiler 2 tube side liquid cannot be filled is avoided, the first regulating valve is arranged between the stripping tower reboiler 2 tube side outlet and the vaporization tower 3, the pipeline vibration can be effectively avoided, waste of waste water heat is effectively solved, meanwhile, steam consumption is reduced, cooling water consumption is reduced, and stable operation of a dimethyl ether device is guaranteed; the temperature of the rectifying tower bottom liquid is increased by utilizing the heat of the waste water of the vaporizing tower 3, and then the rectifying tower bottom liquid enters the vaporizing tower 3, the temperature of the rectifying tower bottom liquid is increased by utilizing the waste water of the vaporizing tower 3, and the steam usage amount of the vaporizing tower 3 is reduced; after the temperature of the wastewater is reduced by the tower bottom liquid of the rectifying tower, the evaporation capacity of the circulating water is reduced after the wastewater enters the wastewater cooler 6, and the consumption of the circulating water is saved.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made based on the invention. Accordingly, it is intended that all such modifications and alterations be included within the scope of this invention as defined in the appended claims.
Claims (10)
1. A dimethyl ether production system with a waste water heat utilization structure comprises a stripping tower (1), a stripping tower reboiler (2), a vaporization tower (3), a rectifying tower kettle liquid tank (4), a rectifying tower kettle liquid pump (5) and a waste water cooler (6), and is characterized in that the rectifying tower kettle liquid tank (4) is connected with the rectifying tower kettle liquid pump (5) through a pipeline, and the rectifying tower kettle liquid pump (5) is connected with the vaporization tower (3) through a pipeline; a first stop valve (7) is arranged on the pipeline between the rectifying tower liquid kettle pump (5) and the vaporization tower (3), a first branch pipeline (8) is communicated and arranged on the pipeline at the lower end of the first stop valve (7), the other end of the first branch pipeline (8) is connected with a tube pass inlet of the stripping tower (1), a second stop valve (9) and a stripping tower tube pass inlet valve (10) are arranged on the first branch pipeline (8), and the stripping tower tube pass inlet valve (10) is arranged between the tube pass inlet of the stripping tower (1) and the second stop valve (9); a second branch pipeline (11) is communicated and installed on a pipeline at the upper end of the first stop valve (7), the other end of the second branch pipeline (11) is connected with a pipe side outlet of the stripping tower (1), a third stop valve (12) and a stripping tower pipe side outlet valve (13) are installed on the second branch pipeline (11), and the stripping tower pipe side outlet valve (13) is installed between the pipe side outlet of the stripping tower (1) and the third stop valve (12); the tube side inlet of the stripping tower reboiler (2) is connected with a pipeline between the second stop valve (9) and the stripping tower tube side inlet valve (10) through a pipeline; the tube side outlet of the stripping tower reboiler (2) is connected with a pipeline between the third stop valve (12) and the stripping tower tube side outlet valve (13) through a pipeline; the tube side outlet of the stripping tower (1) is connected with the shell side inlet of the wastewater cooler (6) through a pipeline; an outlet of the vaporization tower (3) is connected with a shell pass inlet of a reboiler (2) of the stripping tower through a pipeline; the shell pass outlet of the stripping tower reboiler (2) is connected with the shell pass inlet of the wastewater cooler (6) through a pipeline; a stripping tower feeding valve (14) is arranged at the upper part of the stripping tower (1); a first regulating valve (15) is connected on a pipeline between a rectifying tower liquid tank pump (5) and the vaporization tower (3), and a second regulating valve (16) and a waste water cooler shell pass inlet stop valve (17) are installed on a pipeline between a shell pass outlet of a stripping tower reboiler (2) and a shell pass inlet of the waste water cooler (6).
2. The dimethyl ether production system with a waste water heat utilizing structure according to claim 1, wherein the first regulating valve (15) is located above a pipe connection point between the second branch pipe (11) and the rectifying tower still pump (5) and the vaporization tower (3); the second regulating valve (16) and the waste water cooler shell side inlet stop valve (17) are connected with a stripper feeding valve (14) through a pipeline.
3. The dimethyl ether production system with a waste water heat utilizing structure according to claim 2, wherein the first regulating valve (15) is connected to the thirty second tray of the vaporization tower (3) through a pipe.
4. The dimethyl ether producing system with a waste water heat utilizing structure according to claim 1, wherein the first branch pipe (8) and the second branch pipe (11) are each DN50 pipes.
5. The dimethyl ether production system with a waste water heat utilizing structure according to claim 1, wherein an outlet of the waste water cooler (6) is connected to a biochemical treatment apparatus.
6. The use method of the dimethyl ether production system with the waste water heat utilization structure according to any one of claims 1 to 5, comprising the steps of:
closing a stripper tube side inlet valve (10), a stripper tube side outlet valve (13) and a stripper feed valve (14);
closing the first stop valve (7), opening the second stop valve (9) and opening the third stop valve (12);
the wastewater of the vaporization tower (3) enters the shell pass of a reboiler (2) of a stripping tower;
discharging the tower bottom liquid of the rectifying tower from a rectifying tower bottom liquid groove (4), wherein the tower bottom liquid of the rectifying tower enters a pipe pass of a stripping tower reboiler (2) through a rectifying tower bottom liquid pump (5) and a second stop valve (9);
the waste water and the tower bottom liquid of the rectifying tower exchange heat through a stripping tower reboiler (2);
flowing the wastewater from the stripper reboiler (2) shell side to a wastewater cooler (6);
and enabling the tower bottom liquid of the rectifying tower to enter the vaporization tower (3) from a tube pass outlet of a reboiler (2) of the stripping tower through a third stop valve (12).
7. The use method of the dimethyl ether production system with the waste water heat utilization structure according to claim 6, characterized in that the rectifying tower bottom liquid is discharged from the tube side outlet of the stripping tower reboiler (2), enters the first regulating valve (15) through the third stop valve (12) and then enters the vaporization tower (3).
8. The use method of the dimethyl ether production system with the waste water heat utilization structure according to claim 7, wherein the first regulating valve (15) is regulated to control the flow of the rectification column bottom liquid flow into the vaporization column (3).
9. The use method of the dimethyl ether production system with the waste water heat utilization structure according to claim 8, wherein the distillation column bottom liquid enters the thirty-second layer tray of the vaporization column (3).
10. The use method of the dimethyl ether production system with a waste water heat utilization structure according to claim 6, wherein the waste water is discharged from the waste water cooler (6) to a biochemical treatment apparatus.
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| CN214597300U (en) * | 2021-03-26 | 2021-11-05 | 河南开祥精细化工有限公司 | Dimethyl ether production system capable of utilizing waste water heat |
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| CN113058282A (en) | 2021-07-02 |
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