Methanol production system

Abstract

The utility model provides a methanol production system which is independently provided with a backup nitrogen system outside an air separator system. In a normal state, nitrogen is separated and obtained from air through the air separator system, and the nitrogen is provided for the production main system and used for nitrogen consumption in the methanol production process of the production main system; when the air separator system is shut down or cannot be used, liquid nitrogen stored in the air separator system is gasified into nitrogen through a gasification device by means of the backup nitrogen system, and then the nitrogen is supplied to a production main system for emergency nitrogen supply. Therefore, the technical problem that the methanol production system is forced to stop due to lack of low-pressure nitrogen supply is avoided.

Description

Technical Field

[0001] This utility model belongs to the technical field of methanol production systems, and specifically relates to a methanol production system. Background Technology

[0002] Methanol is an important raw material and product in the chemical industry. In methanol production, low-pressure nitrogen plays multiple roles, including system replacement, protection, stripping, inert gas, sealing, and purging. These roles together ensure the safety, stability, and efficiency of the methanol production process.

[0003] In existing methanol production systems, air separation devices are generally used to utilize the different boiling points of the components in air. Through steps such as air compression, expansion and refrigeration, air purification, air cooling and liquefaction, and air distillation separation, air is liquefied at low temperatures, and components such as nitrogen and oxygen are separated through distillation to obtain high-purity nitrogen, which then plays a role in methanol production.

[0004] However, in the existing technology, when an emergency failure or sudden extreme weather occurs, causing the air separation unit to shut down or become unusable, the methanol production system will be forced to stop due to the lack of nitrogen supply, resulting in economic losses and even safety risks. Utility Model Content

[0005] In order to solve the technical problem in the background art that when the air separation device is shut down or unusable, the methanol production system will be forced to stop due to the lack of low-pressure nitrogen supply, resulting in economic losses and even safety risks, this utility model provides a methanol production system.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A methanol production system includes: a main production system, an air separator system, and a backup nitrogen system; the air separator system is connected to the main production system; wherein the backup nitrogen system includes: a storage device, a conveying device, and a vaporization device, the storage device storing liquid nitrogen, the conveying device connecting the storage device and the vaporization device, and the vaporization device connecting to the main production system.

[0008] Optionally, the vaporization device is any one of an air bath vaporizer, a steam-heated vaporizer, or an electrically heated vaporizer.

[0009] Optionally, there are multiple gasification devices, and each gasification device is connected to the main production system and the conveying device.

[0010] Optionally, the storage device is also connected to the air separator system.

[0011] Optionally, the conveying device and the gasification device are connected via a first pipeline; the air separator system and the main production system are connected via a second pipeline; a three-way regulating valve is installed on the second pipeline; and the gasification device is connected to the second pipeline through the three-way regulating valve.

[0012] Optionally, a flow analyzer is installed on one end of the second pipeline near the air separator system.

[0013] Optionally, a return pipeline is also provided on the first pipeline, and the return pipeline connects the storage device and the first pipeline.

[0014] Optionally, a tanker truck interface is also provided on the first pipeline.

[0015] Optionally, a flow meter is provided at one end of the first pipeline near the conveying device.

[0016] Optionally, the delivery device is a liquid nitrogen pump.

[0017] The beneficial effects of this utility model are:

[0018] (1) This utility model provides a methanol production system. In addition to the air separator system, a backup nitrogen system is set up separately. When the air separator is shut down or cannot be used, the liquid nitrogen stored in the backup nitrogen system is vaporized into low-pressure nitrogen through a vaporization device and then supplied to the methanol production system for emergency nitrogen supply. This avoids the technical problem of the methanol production system being forced to shut down due to the lack of low-pressure nitrogen supply.

[0019] (2) At the same time, in this utility model, the storage device in the backup nitrogen system is connected to the air separator system, so that the liquid nitrogen by-product during the operation of the air separator system can be recovered, and in emergency situations, the recovered liquid nitrogen can be vaporized and supplied to the methanol production system. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the methanol production system in this utility model;

[0021] Figure 2 This is a schematic diagram of the methanol production system of this utility model, which has multiple gasification devices;

[0022] Figure 3 This is a further schematic diagram of the methanol production system in this utility model.

[0023] The system includes: 1. Main production system; 2. Air separator system; 3. Backup nitrogen system; 31. Storage device; 32. Conveying device; 33. Gasification device; 4. First pipeline; 41. Return pipeline; 42. Tanker interface; 5. Second pipeline; 51. Three-way regulating valve. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0027] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0028] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0029] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0030] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] See Figure 1 The diagram shows a methanol production system as described in this application. The methanol production system includes: a main production system 1, an air separator system 2, and a backup nitrogen system 3; the air separator system 2 is connected to the main production system 1; wherein, the backup nitrogen system 3 includes: a storage device 31, a conveying device 32, and a vaporization device 33. The storage device 31 stores liquid nitrogen, the conveying device 32 connects the storage device 31 and the vaporization device 33, and the vaporization device 33 is connected to the main production system 1.

[0032] In this embodiment, a methanol production system is provided, which includes a separate backup nitrogen system 3 in addition to the air separator system 2. Under normal conditions, nitrogen is separated from the air by the air separator system 2 and supplied to the main production system 1 for nitrogen consumption during methanol production. When the air separator system 2 shuts down or becomes unusable, the backup nitrogen system uses a vaporization device 33 to vaporize the stored liquid nitrogen into nitrogen gas, which is then supplied to the main production system 1 as an emergency nitrogen supply. This avoids the technical problem of the methanol production system being forced to shut down due to a lack of low-pressure nitrogen supply.

[0033] Furthermore, the main production system 1 should include a low-pressure nitrogen pipeline network for supplying nitrogen during the methanol production process; the gasification unit 33 and the air separator system 2 should be connected to the low-pressure nitrogen pipeline network.

[0034] Furthermore, the storage device 31 may be a liquid nitrogen storage tank, a liquid nitrogen temporary storage tank, or any liquid nitrogen storage device known to those skilled in the art.

[0035] For example, when using 1000m 3 When the storage device 31 has a storage capacity, under standard conditions, it has a capacity of 1000m. 3 Liquid nitrogen can be converted to 648,000 m 3 Nitrogen gas, such as in a methanol production system where the nitrogen consumption under normal conditions is 20,000 Nm³. 3 In this embodiment, when the air separator system malfunctions or needs to be shut down for maintenance, the liquid nitrogen stored in the storage device 31 can continuously supply the nitrogen demand of the methanol production system for at least 32 hours, thus saving valuable time for the maintenance, repair or replacement of the air separator system and avoiding economic losses and safety risks caused by the methanol production system being forced to shut down due to lack of nitrogen supply.

[0036] It should be noted that those skilled in the art can select the type and storage capacity of the storage device 31 according to actual production and usage needs. This embodiment is only an example.

[0037] Optionally, the gasification device 33 described in this utility model is any one of an air bath gasifier, a steam-heated gasifier, or an electric-heated gasifier.

[0038] In this embodiment, the vaporization device 33 can be specifically selected as any one of an air bath vaporizer, a steam-heated vaporizer, or an electric-heated vaporizer, thereby realizing the vaporization treatment of liquid nitrogen.

[0039] Furthermore, the vaporization device 33 can preferably be an air bath vaporizer, as air bath vaporizers have the advantages of low energy consumption, high efficiency, and simple structure, and can stably perform the vaporization treatment function of liquid nitrogen in emergency situations. Specifically, the QN-4000 / 80 model air bath vaporizer can be selected.

[0040] Optionally, refer to Figure 2 In this utility model, there are multiple gasification devices 33, and each gasification device 33 is connected to the main production system 1 and the conveying device 31, that is, multiple gasification devices 33 are arranged in parallel.

[0041] In this embodiment, multiple parallel vaporization devices 33 are set in the backup nitrogen system 3. In emergency scenarios, the liquid nitrogen is vaporized simultaneously by multiple vaporization devices 33, thereby ensuring the nitrogen supply while making multiple vaporization devices 33 redundant backups for each other, thus improving the reliability of the system.

[0042] Optionally, the storage device 31 described in this invention is also connected to the air separator system 2.

[0043] In this embodiment, the air separator system 2 generates liquid nitrogen as a byproduct during its normal operation. By connecting the storage device 31 to the air separator system 2, the liquid nitrogen is recovered and stored. The recovered liquid nitrogen can be used as liquid nitrogen stored in the backup nitrogen system 3, or, if a large amount of liquid nitrogen is stored, it can be transferred and sold to create economic value.

[0044] Optionally, refer to Figure 1 and Figure 3 In this utility model, the conveying device 32 and the gasification device 33 are connected by the first pipeline 4; the air separator system 2 and the main production system 1 are connected by the second pipeline 5; a three-way regulating valve 51 is provided on the second pipeline 5; the gasification device 33 is connected to the second pipeline 5 through the three-way regulating valve 51.

[0045] In this embodiment, a three-way regulating valve 51 is installed on the second pipeline 5, allowing the vaporization device 33 to be connected to the second pipeline 5 via the three-way regulating valve 51. In application, the connection between the main production system 1, the vaporization device 33, and the air separator system 2 can be adjusted via the three-way regulating valve 51. Specifically, when the air separator system 2 is working normally, the three-way regulating valve 51 connects the air separator system 2 to the main production system 1 and disconnects the vaporization device 33 from the main production system 1. At this time, nitrogen produced by the air separator system 2 supplies nitrogen to the main production system. When the air separator system 2 malfunctions and shuts down or needs maintenance, the three-way regulating valve 51 can be used to disconnect the connection between the air separator system 2 and the main production system 1, and connect the vaporization device 33 to the main production system 1. This allows nitrogen to be supplied to the main production system 1 via the storage device 31, the conveying device 32, and the vaporization device 33 in the backup nitrogen system 3, preventing the main production system from shutting down due to a lack of nitrogen supply.

[0046] Optionally, a flow analyzer is provided on one end of the second pipeline 5 near the air separator system 2 in this utility model.

[0047] In this embodiment, the nitrogen production output flow rate of the air separator system 2 is obtained by a flow analyzer. Operators can determine whether the air separator system 2 is in normal working condition based on the flow rate, and adjust the three-way regulating valve 51, the vaporization device 33, and the conveying device 32 accordingly. Specifically, when the flow analyzer detects that the nitrogen production output flow rate of the air separator system 2 is within a certain threshold, it indicates that the air separator system 2 is in normal working condition. At this time, the three-way regulating valve 51 is adjusted to connect the air separator system 2 and the main production system 1, and the vaporization device 33 and the conveying device 32 are not in operation. When the flow analyzer detects that the nitrogen production output flow rate of the air separator system 2 is lower than a certain threshold, it indicates that the air separator system 2 is not working properly and the nitrogen output is insufficient. At this time, the three-way control valve is opened to connect the vaporization device 33 and the main production system 1, and the vaporization device 33 and the conveying device 32 begin to work to convert the liquid nitrogen in the storage device 31 into nitrogen gas and supply it to the main production system 1.

[0048] Optionally, refer to Figure 3 The first pipeline 4 described in this utility model is also provided with a return pipeline 41, which is connected to the storage device 31.

[0049] In this embodiment, in practical applications, the conveying device 32, such as a liquid nitrogen pump, has a minimum discharge flow rate. Therefore, in order to ensure the normal use and start-up of the conveying device 32, a return pipeline 41 is set on the first pipeline 4 so that the discharge flow rate of the conveying device 32 is greater than its minimum flow rate, and the excess discharged liquid nitrogen is introduced into the storage device 31 through the return pipeline 41.

[0050] Optionally, refer to Figure 3 The first pipeline 4 described in this utility model is also provided with a tanker interface 42.

[0051] In this embodiment, a tanker interface 42 is provided on the first pipeline 4. In application, when the amount of liquid nitrogen byproducts generated by the air separator system 2 is large, the recovered liquid nitrogen can be transferred and sold via tanker.

[0052] Optionally, a flow meter is provided at one end of the first pipeline 4 near the conveying device 32 in this utility model.

[0053] In this embodiment, a flow meter is installed at one end of the first pipeline 4 near the delivery device 32. Through the flow meter, the operator can obtain the liquid nitrogen supply of the backup nitrogen system 3 in real time during operation, which facilitates control or switching of its working state.

[0054] Optionally, the conveying device 32 described in this utility model is a liquid nitrogen pump.

[0055] In this embodiment, the conveying device 32 can be specifically selected as a liquid nitrogen pump, which is used to convey cryogenic liquid nitrogen, so that it enters the vaporization device 33 through the first pipeline 4 and is vaporized, and finally supplied to the main production system 1 in the form of nitrogen gas.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A methanol production system, characterized in that, The methanol production system includes: a main production system (1), an air separator system (2), and a backup nitrogen system (3); The air separator system (2) is connected to the main production system (1); The backup nitrogen system (3) includes a storage device (31), a conveying device (32), and a vaporization device (33). The storage device (31) stores liquid nitrogen. The conveying device (32) connects the storage device (31) and the vaporization device (33). The vaporization device (33) connects to the main production system (1).

2. The methanol production system according to claim 1, characterized in that, The gasification device (33) is any one of an air bath gasifier, a steam-heated gasifier, or an electric-heated gasifier.

3. The methanol production system according to claim 1, characterized in that, There are multiple gasification devices (33), and each gasification device (33) is connected to the main production system (1) and the conveying device (32).

4. The methanol production system according to claim 1, characterized in that, The storage device (31) is also connected to the air separator system (2).

5. The methanol production system according to claim 4, characterized in that, The conveying device (32) and the gasification device (33) are connected by a first pipeline (4); The air separator system (2) and the main production system (1) are connected by a second pipeline (5); A three-way regulating valve (51) is installed on the second pipeline (5); The gasification device (33) is connected to the second pipeline (5) through the three-way regulating valve (51).

6. The methanol production system according to claim 5, characterized in that, A flow analyzer is installed on one end of the second pipeline (5) near the air separator system (2).

7. The methanol production system according to claim 5, characterized in that, The first pipeline (4) is also provided with a return pipeline (41), which connects the storage device (31) and the first pipeline (4).

8. The methanol production system according to claim 5, characterized in that, The first pipeline (4) is also equipped with a tanker interface (42).

9. The methanol production system according to claim 5, characterized in that, A flow meter is installed at one end of the first pipeline (4) near the conveying device (32).

10. The methanol production system according to any one of claims 1 to 9, characterized in that, The conveying device (32) is a liquid nitrogen pump.

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