CN214808522U - Methanol rectification unit waste heat cascade utilization coproduction heating system - Google Patents
Methanol rectification unit waste heat cascade utilization coproduction heating system Download PDFInfo
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- CN214808522U CN214808522U CN202120936874.3U CN202120936874U CN214808522U CN 214808522 U CN214808522 U CN 214808522U CN 202120936874 U CN202120936874 U CN 202120936874U CN 214808522 U CN214808522 U CN 214808522U
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Abstract
The utility model discloses a methanol rectification unit waste heat cascade utilization cogeneration heating system, which comprises a pressurized rectification tower, an atmospheric rectification tower, a primary heat exchanger, a secondary heat exchanger and a tertiary heat exchanger; a pressurizing tower methanol product pipeline is arranged at the top of the pressurizing rectification tower, and a pressurizing tower kettle bottom liquid pipeline is arranged at the bottom of the pressurizing rectification tower; the top of the atmospheric rectification tower is provided with an atmospheric tower methanol product pipeline, and the bottom of the atmospheric tower is provided with an atmospheric tower kettle bottom liquid pipeline; the pressurizing tower methanol product pipeline is communicated with the atmospheric tower methanol product pipeline after passing through the three-stage heat exchanger and is connected to the first-stage heat exchanger together; the bottom liquid pipeline of the pressurizing tower is communicated with the inlet of the atmospheric distillation tower; and the bottom liquid pipeline of the atmospheric tower is connected to the secondary heat exchanger. The return water of the heat supply network is used as a cold source of the heat exchanger to replace circulating cooling water conventionally adopted by the rectification unit, so that the consumption and consumption of the circulating cooling water are reduced, and a certain water-saving effect is achieved.
Description
Technical Field
The utility model belongs to the technical field of the heat supply network heat supply, concretely relates to methanol rectification unit waste heat cascade utilization coproduction heating system.
Background
The coal-to-methanol process is a production process for catalytically synthesizing methanol by using synthesis gas based on coal gasification synthesis gas, and the industry is developed to be large-scale and high-efficiency. The development of the project for preparing methanol from coal is beneficial to the full and reasonable utilization of coal resources in China. Because the methanol productivity in China is excessive at present, the development trend of the methanol production technology is as follows: large-scale production devices, high energy consumption, high water consumption and capacity, gradual elimination, vigorous development, selection of a new water-saving process, vigorous development, selection of a proper energy-saving technology and the like.
In the methanol production flow, after a rectification system is started, kettle bottom liquid generated at the bottom of an atmospheric rectification tower is generally cooled by circulating cooling water and is directly discharged after water treatment and the like, and methanol products at the tops of a pressurizing tower and the atmospheric rectification tower are cooled and condensed by the circulating cooling water and are sent to a methanol storage tank. The heat of the bottom liquid and the methanol product at the top of the tower does not exert the utilization value thereof, and the heat waste is caused, so that a method for fully utilizing the methanol product at the top of the pressurizing tower and the atmospheric distillation tower and the low-grade heat of the bottom liquid of the atmospheric distillation tower is needed.
CN 210933964U discloses a rectification waste water waste heat utilization device, which introduces the bottom liquid of an atmospheric rectification tower into a heat exchanger to exchange heat with crude methanol, adjusts the feeding temperature of a pre-rectification tower in a rectification system, and achieves the purpose of reducing energy consumption to a certain extent.
Although the prior art can achieve the purpose of reducing energy consumption to a certain extent, the prior art is not beneficial to water saving of a system, and meanwhile, the low-grade heat of the product gas at the tops of a pressurizing tower and a normal-pressure rectifying tower cannot be utilized, so that the waste of heat is caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a methanol rectification unit waste heat cascade utilization coproduction heating system to among the solution prior art, the extravagant problem of heat in the rectification system.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a cogeneration heat supply system for cascade utilization of waste heat of a methanol rectification unit comprises a pressurized rectification tower, an atmospheric rectification tower, a primary heat exchanger, a secondary heat exchanger and a tertiary heat exchanger;
the top of the pressurizing rectification tower is connected with a pressurizing tower methanol product pipeline, and the bottom of the pressurizing rectification tower is connected with a pressurizing tower kettle bottom liquid pipeline;
the top of the atmospheric rectification tower is connected with an atmospheric tower methanol product pipeline, and the bottom of the atmospheric rectification tower is connected with an atmospheric tower kettle bottom liquid pipeline;
the pressurizing tower methanol product pipeline is communicated with the atmospheric tower methanol product pipeline after passing through the three-stage heat exchanger and is connected to the first-stage heat exchanger together; the bottom liquid pipeline of the pressurizing tower is communicated with the inlet of the atmospheric distillation tower;
and the bottom liquid pipeline of the atmospheric tower is connected to the secondary heat exchanger.
Specifically, the heat supply network water return pipeline is sequentially connected with the primary heat exchanger, the secondary heat exchanger, the tertiary heat exchanger and the heat supply network pipeline.
Specifically, the heat exchanger is a double-pipe heat exchanger.
Specifically, the heat exchanger is a shell-and-tube heat exchanger.
Specifically, the heat exchanger is a plate heat exchanger.
Specifically, the inlet of the pressurized rectifying tower is connected with the bottom outlet of the pre-rectifying tower.
Specifically, an inlet of the pre-rectifying tower is connected with a crude methanol pipeline, and a methanol product pipeline of the pre-rectifying tower is arranged at the top of the pre-rectifying tower.
Specifically, in the first-stage heat exchanger, the heat source is a mixture of a methanol product distilled from the top of the atmospheric distillation tower and a methanol product distilled from the top of the pressurized distillation tower after heat exchange by the third-stage heat exchanger, and the cold source is water in a return water pipeline of a heat supply network.
Specifically, in the secondary heat exchanger, the heat source is the bottom liquid of the atmospheric distillation tower, and the cold source is the return water of the heat supply network after the heat exchange and temperature rise of the primary heat exchanger.
Specifically, in the third-stage heat exchanger, the heat source is a methanol product distilled from the top of the pressurized rectifying tower, and the cold source is heat supply network backwater heated by heat exchange of the second-stage heat exchanger.
The utility model has the advantages as follows:
1. the embodiment of the utility model provides a methanol rectification unit waste heat cascade utilization coproduction heating system replaces the recirculated cooling water that the rectification unit is conventional to be adopted as the cold source of heat exchanger through the heat supply network return water, has reduced recirculated cooling water's quantity and consumption, has reached certain water conservation effect.
2. The embodiment of the utility model provides a methanol rectification unit waste heat cascade utilization coproduction heating system, on utilizing the thermal basis of ordinary pressure rectifying column cauldron bottom liquid, the low-grade heat in the make full use of rectifying column tower top methyl alcohol product. By means of the cascade utilization of energy, it is possible to supply network water up to 130 ℃.
2. The embodiment of the utility model provides a methanol rectification unit waste heat cascade utilization coproduction heating system, through rectification unit coproduction heat supply, increased the heat supply income, improved the economic benefits of methanol factory.
Drawings
The accompanying drawings, which form a part of the present application, 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 structural view of a heating system for cascade utilization of waste heat of a methanol rectification unit according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a heating method for cascade utilization of waste heat of a methanol rectification unit according to an embodiment of the present invention.
Wherein: 1, pressurizing a rectifying tower; 2, a normal pressure rectifying tower; 3, a first-stage heat exchanger; 4, a secondary heat exchanger; 5, a three-stage heat exchanger; 6 pre-rectifying tower.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention.
As shown in fig. 1, an embodiment of the present invention provides a cogeneration heating system by using methanol rectification unit waste heat in a cascade manner, which includes a pressure rectification tower 1, an atmospheric rectification tower 2, a primary heat exchanger 3, a secondary heat exchanger 4, a tertiary heat exchanger 5 and a pre-rectification tower 6;
an inlet of the pressurized rectifying tower 1 is connected with an outlet at the bottom of the pre-rectifying tower 6, an inlet of the pre-rectifying tower 6 is connected with a crude methanol pipeline, and a methanol product pipeline of the pre-rectifying tower is arranged at the top of the pre-rectifying tower 6; a pressurizing tower methanol product pipeline is arranged at the top of the pressurizing rectifying tower 1, and a pressurizing tower kettle bottom liquid pipeline is arranged at the bottom of the pressurizing rectifying tower; the top of the atmospheric distillation tower 2 is provided with an atmospheric tower methanol product pipeline, and the bottom is provided with an atmospheric tower kettle bottom liquid pipeline; the methanol product pipeline of the pressurizing tower is communicated with the methanol product pipeline of the atmospheric tower after passing through the three-stage heat exchanger 5 and is connected to the first-stage heat exchanger 3 together; the bottom liquid pipeline of the pressurizing tower is communicated with the inlet of the atmospheric distillation tower 2; the bottom liquid pipeline of the atmospheric tower is connected to the secondary heat exchanger 4; the heat supply network water return pipeline is connected to the heat supply network pipeline after sequentially passing through the first-stage heat exchanger 3, the second-stage heat exchanger 4 and the third-stage heat exchanger 5.
In an embodiment of the present invention, in the first-stage heat exchanger, the heat source is the methanol product distilled from the top of the atmospheric distillation tower 2, and the methanol product distilled from the top of the pressurized distillation tower 1 is the mixture of the heat source outlet methanol product after heat exchange in the third-stage heat exchanger 5, and the cold source is water in the return water pipeline of the heat supply network. In the secondary heat exchanger 4, the heat source is the kettle bottom liquid of the atmospheric distillation tower 2, and the cold source is the return water of the heat supply network after heat exchange and temperature rise through the primary heat exchanger 3. In the third-stage heat exchanger 5, the heat source is a methanol product distilled from the top of the pressure rectifying tower 1, and the cold source is heat supply network backwater heated by heat exchange of the second-stage heat exchanger 4. Water in the heat supply network water return pipeline enters a first-stage heat exchanger for heat exchange and is heated to 50-80 ℃, then enters a second-stage heat exchanger for heat exchange and is heated to 85-95 ℃, and then enters a third-stage heat exchanger for heat exchange and is heated to 100-130 ℃. And (2) the methanol product distilled from the top of the pressurized rectifying tower 1 enters a third-stage heat exchanger 5 to exchange heat with the heat supply network backwater heated by the heat exchange of a second-stage heat exchanger 4, the temperature of the methanol product after heat exchange is 95-120 ℃, then the part of methanol is mixed with the methanol product distilled from the top of the atmospheric rectifying tower 2, the temperature after mixing is 80-100 ℃, and then the methanol product enters a first-stage heat exchanger 3 to exchange heat with the heat supply network backwater, and the temperature of the methanol after heat exchange is 30-60 ℃. And directly feeding the kettle bottom liquid of the atmospheric distillation tower 2 into a secondary heat exchanger 4 to exchange heat with the heat supply network backwater heated by the heat exchange of the primary heat exchanger 3, wherein the temperature of the kettle bottom liquid after heat exchange is 60-80 ℃, and sending the kettle bottom liquid to a water treatment system for treatment and then discharging.
In an embodiment of the present invention, since the output of each column of the rectification unit of the methanol plant is generally unchanged, the flow rate of the supplied hot water can be determined according to the requirement of the temperature of the heat supply network, and a suitable heat exchanger form and size can be selected accordingly. Heat exchangers include, but are not limited to, double pipe heat exchangers, shell and tube heat exchangers, plate heat exchangers, and the like.
As shown in figure 2, the working principle of the methanol rectification unit waste heat cascade utilization cogeneration heating system of the utility model is as follows:
water in the heat supply network water return pipeline enters a primary heat exchanger for heat exchange and is heated to 50-80 ℃, then enters a secondary heat exchanger for heat exchange and is heated to 85-95 ℃, and then enters a tertiary heat exchanger for heat exchange and is heated to 100-130 ℃;
the methanol product distilled from the top of the pressurized rectifying tower 1 enters a third-stage heat exchanger 5 to exchange heat with heat supply network backwater heated by heat exchange of a second-stage heat exchanger 4, the temperature of the methanol product after heat exchange is 95-120 ℃, then the part of methanol is mixed with the methanol product distilled from the top of the atmospheric rectifying tower 2, the temperature after mixing is 80-100 ℃, and then the methanol product enters a first-stage heat exchanger 3 to exchange heat with the heat supply network backwater, and the temperature of the methanol after heat exchange is 30-60 ℃;
and directly feeding the kettle bottom liquid of the atmospheric distillation tower 2 into a secondary heat exchanger 4 to exchange heat with the heat supply network backwater heated by the heat exchange of the primary heat exchanger 3, wherein the temperature of the kettle bottom liquid after heat exchange is 60-80 ℃, and sending the kettle bottom liquid to a water treatment system for treatment and then discharging.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of the invention or which are equivalent to the scope of the invention are embraced by the invention.
Claims (10)
1. A cogeneration heating system for cascade utilization of waste heat of a methanol rectification unit is characterized by comprising a pressurized rectification tower (1), an atmospheric rectification tower (2), a primary heat exchanger (3), a secondary heat exchanger (4) and a tertiary heat exchanger (5);
the top of the pressurized rectifying tower (1) is connected with a pressurized tower methanol product pipeline, and the bottom of the pressurized rectifying tower (1) is connected with a pressurized tower kettle bottom liquid pipeline;
the top of the atmospheric distillation tower (2) is connected with an atmospheric tower methanol product pipeline, and the bottom of the atmospheric distillation tower (2) is connected with an atmospheric tower kettle bottom liquid pipeline;
the pressurizing tower methanol product pipeline is communicated with the atmospheric tower methanol product pipeline after passing through the three-stage heat exchanger (5) and is connected to the first-stage heat exchanger (3) together; the bottom liquid pipeline of the pressurizing tower is communicated with the inlet of the atmospheric distillation tower (2);
and the bottom liquid pipeline of the atmospheric tower is connected to the secondary heat exchanger (4).
2. The methanol rectification unit waste heat cascade utilization cogeneration heating system of claim 1, wherein the heat supply network return water pipeline is connected with the primary heat exchanger (3), the secondary heat exchanger (4), the tertiary heat exchanger (5) and the heat supply network pipeline in sequence.
3. The methanol rectification unit waste heat cascade utilization cogeneration heating system of claim 2, wherein the heat exchanger is a double pipe heat exchanger.
4. The methanol rectification unit waste heat cascade utilization cogeneration heating system of claim 2, wherein the heat exchanger is a shell and tube heat exchanger.
5. The methanol rectification unit waste heat cascade utilization cogeneration heating system of claim 2, wherein the heat exchanger is a plate heat exchanger.
6. The cogeneration heating system according to claim 1, wherein the inlet of the pressurized rectifying tower (1) is connected with the bottom outlet of the pre-rectifying tower (6).
7. The cogeneration heating system according to claim 6, wherein the inlet of the pre-rectifying tower (6) is connected with a crude methanol pipeline, and a methanol product pipeline of the pre-rectifying tower is arranged at the top of the pre-rectifying tower (6).
8. The cogeneration heating system of the methanol rectification unit waste heat cascade utilization according to claim 1, characterized in that in the primary heat exchanger, the heat source is the mixture of the methanol product distilled from the top of the atmospheric rectification tower (2) and the methanol product distilled from the top of the pressurized rectification tower (1) after heat exchange by the three-stage heat exchanger (5), and the cold source is water in the return water pipeline of the heat supply network.
9. The cogeneration heating system of the methanol rectification unit waste heat cascade utilization according to claim 1, characterized in that in the secondary heat exchanger (4), the heat source is the bottom liquid of the atmospheric rectification tower (2), and the cold source is the return water of the heat supply network after the temperature is raised by the heat exchange of the primary heat exchanger (3).
10. The cogeneration heating system of methanol rectification unit waste heat cascade utilization according to claim 1, characterized in that in the third heat exchanger (5), the heat source is the methanol product distilled from the top of the pressurized rectification tower (1), and the cold source is the heat supply network backwater heated by the heat exchange of the second heat exchanger (4).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120936874.3U CN214808522U (en) | 2021-04-30 | 2021-04-30 | Methanol rectification unit waste heat cascade utilization coproduction heating system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120936874.3U CN214808522U (en) | 2021-04-30 | 2021-04-30 | Methanol rectification unit waste heat cascade utilization coproduction heating system |
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| CN214808522U true CN214808522U (en) | 2021-11-23 |
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| CN202120936874.3U Active CN214808522U (en) | 2021-04-30 | 2021-04-30 | Methanol rectification unit waste heat cascade utilization coproduction heating system |
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- 2021-04-30 CN CN202120936874.3U patent/CN214808522U/en active Active
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