Methanol-to-olefin system and control method thereof

Abstract

The invention relates to the technical field of chemical engineering, and discloses a methanol-to-olefin system and a control method thereof.In the system, an inlet of a first sampling pipeline is communicated with a spent catalyst conveying pipeline, and an outlet of the first sampling pipeline is communicated with a first inlet of a first sample pool; the first ultraviolet integrating sphere analyzer is used for detecting a spent catalyst sample in the first sample pool; an inlet of the second sampling pipeline is communicated with the regenerant conveying pipeline, an outlet of the second sampling pipeline is communicated with a first inlet of the second sample pool, and the second ultraviolet integrating sphere analyzer is used for detecting a regenerant sample in the second sample pool; and the first ultraviolet integrating sphere analyzer and the second ultraviolet integrating sphere analyzer are both connected with the data processing device. On the basis of the scheme, the carbon deposition amount of the regenerant and the coked catalyst can be detected online in real time, so that the operating parameters can be adjusted in time.

Description

Technical Field

[0001] The present application relates to the field of chemical technology, and in particular to a methanol to olefins system and a methanol to olefins system control method. Background Art

[0002] In the methanol to olefins (MTO) process, precise control of the carbon deposition of the regenerated agent and the regenerated agent is the key to improving the reaction selectivity.

[0003] At present, the carbon deposit amount of the spent catalyst and the regenerated agent is generally detected by offline sampling, that is, the spent catalyst and the regenerated agent are sampled from the methanol to olefins system respectively, and the carbon deposit amount of the spent catalyst and the regenerated agent samples are detected in the analytical laboratory; then, the operating parameters of the methanol to olefins system are adjusted according to the test results to achieve the control of the carbon deposit amount of the spent catalyst and the regenerated agent.

[0004] However, this method has low control efficiency, which in turn affects the production efficiency of methanol to olefins. Summary of the invention

[0005] The purpose of this application is to overcome the problem in the prior art that the operating parameters cannot be adjusted in time, resulting in low control efficiency of the carbon deposition amount of the spent agent and the regenerated agent, and to provide a methanol to olefins system and a control method thereof.

[0006] In order to achieve the above-mentioned object, the first aspect of the present application provides a methanol to olefins system, the methanol to olefins system comprising a reactor, a regenerator, a spent agent delivery pipeline, a regeneration agent delivery pipeline, a first sampling pipeline, a first sample pool, a first ultraviolet integrating sphere analyzer, a second sampling pipeline, a second sample pool, a second ultraviolet integrating sphere analyzer and a data processing device;

[0007] The outlet of the reactor is connected to the inlet of the regenerator through the spent agent delivery pipeline, and the outlet of the regenerator is connected to the inlet of the reactor through the regenerator delivery pipeline;

[0008] The inlet of the first sampling pipeline is connected to the raw agent delivery pipeline, the outlet of the first sampling pipeline is connected to the first inlet of the first sample pool, and the first ultraviolet integrating sphere analyzer is used to detect the raw agent sample in the first sample pool;

[0009] The inlet of the second sampling pipeline is connected to the regenerant delivery pipeline, the outlet of the second sampling pipeline is connected to the first inlet of the second sample pool, and the second ultraviolet integrating sphere analyzer is used to detect the regenerant sample in the second sample pool;

[0010] The first ultraviolet integrating sphere analyzer and the second ultraviolet integrating sphere analyzer are both connected to the data processing device.

[0011] In an embodiment of the present application, the methanol to olefins system further includes a first valve, and the first valve is disposed on the first sampling pipeline.

[0012] In an embodiment of the present application, the methanol to olefins system further includes a first sample output pipeline and a first nitrogen input pipeline, the inlet of the first sample output pipeline is connected to the outlet of the first sample cell, and the outlet of the first nitrogen input pipeline is connected to the second inlet of the first sample cell.

[0013] In an embodiment of the present application, the methanol to olefins system further includes a second valve and a third valve, the second valve is arranged on the first sample output pipeline, and the third valve is arranged on the first nitrogen input pipeline.

[0014] In an embodiment of the present application, the methanol to olefins system further includes a fourth valve, and the fourth valve is disposed on the second sampling pipeline.

[0015] In an embodiment of the present application, the methanol to olefins system further includes a second sample output pipeline and a second nitrogen input pipeline, the inlet of the second sample output pipeline is connected to the outlet of the second sample pool, and the outlet of the second nitrogen input pipeline is connected to the second inlet of the second sample pool.

[0016] In an embodiment of the present application, the methanol to olefins system further includes a fifth valve and a sixth valve, the fifth valve being arranged on the second sample output pipeline, and the sixth valve being arranged on the second nitrogen input pipeline.

[0017] A second aspect of the present application provides a control method for the above-mentioned methanol to olefins system, the control method comprising:

[0018] Controlling the first ultraviolet integrating sphere analyzer to detect the spent agent sample in the first sample pool to obtain a detection result of the amount of carbon deposited on the spent agent, and controlling the second ultraviolet integrating sphere analyzer to detect the regenerant agent sample in the second sample pool to obtain a detection result of the amount of carbon deposited on the regenerant agent;

[0019] Determine whether the result of the spent agent carbon deposit amount test is within the target spent agent carbon deposit amount range, and determine whether the result of the regeneration agent carbon deposit amount test is within the target regeneration agent carbon deposit amount range;

[0020] If the spent catalyst carbon deposit amount detection result is within the target spent catalyst carbon deposit amount range, and the regeneration agent carbon deposit amount detection result is within the target regeneration agent carbon deposit amount range, the operating parameters of the methanol to olefins system are not adjusted;

[0021] If the spent catalyst carbon deposit amount detection result is not within the target spent catalyst carbon deposit amount range, or the regeneration agent carbon deposit amount detection result is not within the target regeneration agent carbon deposit amount range, the operating parameters of the methanol to olefins system are adjusted.

[0022] In the embodiment of the present application, the control method further includes:

[0023] Establishing a first model between the carbon deposit amount of spent agent, the carbon deposit amount of regenerated agent and product performance;

[0024] Based on the first model, determining the carbon deposit amount of spent agent and the carbon deposit amount of regenerated agent corresponding to the required product performance;

[0025] The target range of carbon deposits of the spent agent is determined based on the carbon deposits of the spent agent corresponding to the required product performance, and the target range of carbon deposits of the regenerated agent is determined based on the carbon deposits of the regenerated agent corresponding to the required product performance.

[0026] In the embodiment of the present application, the control method further includes:

[0027] A second model is established between the carbon deposit amount of the spent catalyst, the carbon deposit amount of the regenerated catalyst and the operating parameters of the methanol to olefins system;

[0028] When the detection result of the carbon deposit amount of the spent agent is not within the target spent agent carbon deposit amount range, or the detection result of the carbon deposit amount of the regenerated agent is not within the target regenerated agent carbon deposit amount range, a control strategy is determined based on the second model, and the operating parameters of the methanol to olefins system are adjusted based on the control strategy.

[0029] Through the above-mentioned methanol to olefins system, the methanol to olefins system includes a reactor, a regenerator, a spent agent delivery pipeline, a regenerant delivery pipeline, a first sampling pipeline, a first sample pool, a first ultraviolet integrating sphere analyzer, a second sampling pipeline, a second sample pool, a second ultraviolet integrating sphere analyzer and a data processing device; the outlet of the reactor is connected to the inlet of the regenerator through the spent agent delivery pipeline, and the outlet of the regenerator is connected to the inlet of the reactor through the regenerant delivery pipeline; the inlet of the first sampling pipeline is connected to the spent agent delivery pipeline, the outlet of the first sampling pipeline is connected to the first inlet of the first sample pool, and the first ultraviolet integrating sphere analyzer is used to detect the spent agent sample in the first sample pool; the inlet of the second sampling pipeline is connected to the regenerant delivery pipeline, the outlet of the second sampling pipeline is connected to the first inlet of the second sample pool, and the second ultraviolet integrating sphere analyzer is used to detect the regenerant sample in the second sample pool; the first ultraviolet integrating sphere analyzer and the second ultraviolet integrating sphere analyzer are both connected to the data processing device. The methanol-to-olefins system provided in the embodiment of the present application can perform real-time online detection of the carbon deposit amounts of the regenerated agent and the regenerated agent, thereby enabling timely adjustment of the operating parameters.

[0030] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. In the accompanying drawings:

[0032] Figure 1 A schematic diagram of the structure of a methanol-to-olefins system according to an embodiment of the present application is shown;

[0033] Figure 2 A schematic diagram of a process flow of a methanol to olefins system control method according to an embodiment of the present application is schematically shown;

[0034] Figure 3 A schematic diagram of establishing a first model and a second model according to an embodiment of the present application is schematically shown.

[0035] Description of Reference Numerals

[0036] 101—reactor; 102—regenerator; 103—regenerated agent delivery pipeline; 104—regenerated agent delivery pipeline; 105—first sampling pipeline; 106—first sample pool; 107—first ultraviolet integrating sphere analyzer; 108—second sampling pipeline; 109—second sample pool; 110—second ultraviolet integrating sphere analyzer; 111—data processing device; 112—first valve; 113—first sample output pipeline; 114—first nitrogen input pipeline; 115—second valve; 116—third valve; 117—fourth valve; 118—second sample output pipeline; 119—second nitrogen input pipeline; 120—fifth valve; 121—sixth valve. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the specific implementation methods described herein are only used to illustrate and explain the embodiments of the present application, and are not used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0038] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0040] As described in the background technology, in the methanol to olefins (MTO) process, precise control of the carbon deposition of the spent agent and the regenerated agent is the key to improving the reaction selectivity. At present, the carbon deposition of the spent agent and the regenerated agent is generally detected by offline sampling, that is, the spent agent and the regenerated agent are sampled from the methanol to olefins system respectively, and the carbon deposition of the spent agent sample and the regenerated agent sample are detected in the analytical laboratory; then, the operating parameters of the methanol to olefins system are adjusted according to the test results to achieve the control of the carbon deposition of the spent agent and the regenerated agent. However, this detection method is not only time-consuming and labor-intensive, but also makes the data update slow, and cannot meet the needs of real-time diagnosis and timely optimization control in the industrial process. That is, this method has low control efficiency and affects the production efficiency of methanol to olefins.

[0041] In view of this, in one embodiment of the present application, a methanol to olefins system is provided, such as Figure 1As shown, the system may include a reactor 101, a regenerator 102, a spent agent delivery pipeline 103, a regenerant delivery pipeline 104, a first sampling pipeline 105, a first sample pool 106, a first ultraviolet integrating sphere analyzer 107, a second sampling pipeline 108, a second sample pool 109, a second ultraviolet integrating sphere analyzer 110, and a data processing device 111; the outlet of the reactor 101 is connected to the inlet of the regenerator 102 through the spent agent delivery pipeline 103, and the outlet of the regenerator 102 is connected to the inlet of the reactor 101 through the regenerant delivery pipeline 104; the inlet of the first sampling pipeline 105 is connected to the spent agent delivery pipeline 106, and the inlet of the first sampling pipeline 105 is connected to the inlet of the spent agent delivery pipeline 107. 03, the outlet of the first sampling pipeline 105 is connected to the first inlet of the first sample pool 106, and the first ultraviolet integrating sphere analyzer 107 is used to detect the regenerated agent sample in the first sample pool 106; the inlet of the second sampling pipeline 108 is connected to the regenerant delivery pipeline 104, the outlet of the second sampling pipeline 108 is connected to the first inlet of the second sample pool 109, and the second ultraviolet integrating sphere analyzer 110 is used to detect the regenerant sample in the second sample pool 109; the first ultraviolet integrating sphere analyzer 107 and the second ultraviolet integrating sphere analyzer 110 are both connected to the data processing device 111.

[0042] Among them, the reactor 101 is the core part of the MTO process, responsible for converting methanol into olefins; the role of the regenerator 102 is to treat the catalyst deactivated during the reaction and restore its activity. Specifically, during the reaction, carbon deposits will block the pores of the catalyst and reduce its activity, so that the catalyst is gradually deactivated. The regenerator 102 can burn the carbon deposits through the action of high temperature and oxygen to restore the activity of the catalyst, and the regenerated catalyst can be returned to the reactor 101 for continued use. It can be understood that the spent agent, that is, the spent catalyst, refers to the deactivated catalyst that is about to be input from the reactor 101 to the regenerator 102; the regenerated agent, that is, the regenerated catalyst, refers to the active catalyst that is about to be input from the regenerator 102 to the reactor 101. Accordingly, the spent agent delivery pipeline 103 can be used to transport the spent agent from the reactor 101 to the regenerator 102, and the regenerated agent delivery pipeline 104 can be used to transport the regenerated agent from the regenerator 102 to the reactor 101.

[0043] In the embodiment of the present application, the inlet of the first sampling pipeline 105 is connected to the raw agent conveying pipeline 103, and the outlet of the first sampling pipeline 105 is connected to the first sample pool 106, so that the raw agent in the raw agent conveying pipeline 103 can be sampled through the first sampling pipeline 105, so that the raw agent sample falls into the first sample pool 106.

[0044] In order to facilitate the control of sampling of the spent agent, in one embodiment, the methanol to olefins system provided in the embodiment of the present application may also include a first valve 112, and the first valve 112 is arranged on the first sampling pipeline 105. The type of the first valve 112 can be selected according to actual needs, for example, the first valve 112 can be a slide valve. In practical applications, after opening the first valve 112, the spent agent in the spent agent delivery pipeline 103 can fall into the first sampling pipeline 105 under the action of gravity, or a suction device can be further arranged on the first sampling pipeline 105 to suck the spent agent in the spent agent delivery pipeline 103 into the first sampling pipeline 105.

[0045] After the spent agent sample falls into the first sample pool 106, the first ultraviolet integrating sphere analyzer 107 can be used to detect the spent agent sample in the first sample pool 106 to obtain the optical properties of the spent agent sample in the ultraviolet light band. Specifically, during the detection process, the integrating sphere in the first ultraviolet integrating sphere analyzer 107 evenly scatters the incident ultraviolet light, and collects the intensity information of the scattered light through the spectral detector to obtain the spectral signal and absorbance of the spent agent sample. In practical applications, the first sample pool 106 can be built-in and fixed in the first ultraviolet integrating sphere analyzer 107 as an accessory of the first ultraviolet integrating sphere analyzer 107.

[0046] In order to smoothly carry out the next sampling and detection, the methanol to olefins system provided in the embodiment of the present application may also include a first sample output pipeline 113 and a first nitrogen input pipeline 114, wherein the inlet of the first sample output pipeline 113 is connected to the outlet of the first sample pool 106, and the outlet of the first nitrogen input pipeline 114 is connected to the second inlet of the first sample pool 106. The first nitrogen input pipeline 114 can be used to input nitrogen into the first sample pool 106 to purge the first sample pool 106 after the detection is completed, and then the spent catalyst sample that has completed the detection in the first sample pool 106 can be output from the first sample pool 106 via the first sample output pipeline 113. The methanol to olefins system can further be provided with a recovery bag connected to the outlet of the first sample output pipeline 113 to recover the spent catalyst sample that has completed the detection.

[0047] To facilitate the control of the above-mentioned purge process, the methanol-to-olefins system provided in the embodiment of the present application may further include a second valve 115 and a third valve 116, wherein the second valve 115 is arranged on the first sample output pipeline 113, and the third valve 116 is arranged on the first nitrogen input pipeline 114. The types of the second valve 115 and the third valve 116 may be selected according to actual needs, for example, the second valve 115 may be a slide valve.

[0048] Similarly, the inlet of the second sampling line 108 is connected to the regenerant delivery line 104 , and the outlet of the second sampling line 108 is connected to the first inlet of the second sample pool 109 , so that the regenerant in the regenerant delivery line 104 can be sampled through the second sampling line 108 so that the regenerant sample falls into the second sample pool 109 .

[0049] In order to facilitate the control of the sampling of the regenerant, in one embodiment, the methanol to olefins system provided in the embodiment of the present application may further include a fourth valve 117, and the fourth valve 117 is arranged on the second sampling pipeline 108. The type of the fourth valve 117 can be selected according to actual needs, for example, the fourth valve 117 can be a slide valve. In practical applications, after opening the fourth valve 117, the regenerant in the regenerant delivery pipeline 104 can fall into the second sampling pipeline 108 under the action of gravity, or a suction device can be further arranged on the second sampling pipeline 108 to suck the regenerant in the regenerant delivery pipeline 104 into the second sampling pipeline 108.

[0050] After the regenerant sample falls into the second sample pool 109, the second ultraviolet integrating sphere analyzer 110 can be used to detect the regenerant sample in the second sample pool 109 to obtain the optical properties of the regenerant sample in the ultraviolet light band. Specifically, during the detection process, the integrating sphere in the second ultraviolet integrating sphere analyzer 110 evenly scatters the incident ultraviolet light, and collects the intensity information of the scattered light through the spectrum detector to obtain the spectrum signal and absorbance of the regenerant sample. In practical applications, the second sample pool 109 can be built-in and fixed in the second ultraviolet integrating sphere analyzer 110 as an accessory of the second ultraviolet integrating sphere analyzer 110.

[0051] In order to smoothly carry out the next sampling and detection, the methanol to olefins system provided in the embodiment of the present application may further include a second sample output pipeline 118 and a second nitrogen input pipeline 119, the inlet of the second sample output pipeline 118 is connected to the outlet of the second sample pool 109, and the outlet of the second nitrogen input pipeline 119 is connected to the second inlet of the second sample pool 109. The second nitrogen input pipeline 119 can be used to input nitrogen into the second sample pool 109 to purge the second sample pool 109 after the detection is completed, and then the regenerant sample that has completed the detection in the second sample pool 109 can be output from the second sample pool 109 via the second sample output pipeline 118. The recovery bag can also be connected to the outlet of the second sample output pipeline 118 to recover the regenerant sample that has completed the detection.

[0052] To facilitate the control of the above-mentioned purge process, the methanol-to-olefins system provided in the embodiment of the present application may further include a fifth valve 120 and a sixth valve 121, wherein the fifth valve 120 is arranged on the second sample output pipeline 118, and the sixth valve 121 is arranged on the second nitrogen input pipeline 119. The types of the fifth valve 120 and the sixth valve 121 may be selected according to actual needs, for example, the fifth valve 120 may be a slide valve.

[0053] In the embodiment of the present application, the first ultraviolet integrating sphere analyzer 107 is connected to the data processing device 111, and the spectral signal and absorbance of the spent catalyst sample can be sent to the data processing device 111. The data processing device 111 can obtain the carbon deposit amount corresponding to the spent catalyst sample based on the absorbance of the spent catalyst sample and the preset regression analysis equation. The methanol to olefins system can further include a control device (not shown in the figure). After calculating the carbon deposit amount of the spent catalyst sample, the data processing device 111 can also send the carbon deposit amount of the spent catalyst sample to the control device.

[0054] Similarly, the second ultraviolet integrating sphere analyzer 110 and the data processing device 111 can send the spectral signal and absorbance of the regenerant sample to the data processing device 111. The data processing device 111 can obtain the carbon deposition amount of the regenerant sample based on the absorbance of the regenerant sample and a preset regression analysis equation. After calculating the carbon deposition amount of the regenerant sample, the data processing device 111 can also send the carbon deposition amount of the regenerant sample to the control device.

[0055] The above-mentioned preset regression analysis equation can be obtained based on historical data. For example, a plurality of catalyst samples with known carbon deposit amounts (the catalyst samples and the spent catalyst samples and regenerated agent samples are the same type of catalysts, for example, all are silicoaluminophosphates) are tested in sequence by an ultraviolet integrating sphere analyzer to obtain the absorbance corresponding to each catalyst sample, and then a regression analysis equation is made based on the carbon deposit amount and absorbance corresponding to each catalyst, that is, a corresponding relationship between the catalyst carbon deposit amount and the absorbance is constructed. Based on the corresponding relationship and the absorbance of the spent catalyst sample to be tested, the carbon deposit amount of the spent catalyst sample to be tested can be obtained. Similarly, based on the corresponding relationship and the absorbance of the regenerated agent sample to be tested, the carbon deposit amount of the regenerated agent sample to be tested can be obtained.

[0056] The operation process of the methanol to olefins system provided in the embodiment of the present application may be:

[0057] The regenerating agent and regenerating agent are sampled periodically, and the sampling frequency can be set according to actual needs, such as once per hour.

[0058] The first valve 112 is opened, the spent catalyst sample falls into the first sample pool 106, and the first valve 112 is closed. After the spent catalyst sample is cooled for a preset time (e.g., 20 minutes), the first ultraviolet integrating sphere analyzer 107 detects the spent catalyst sample in the first sample pool 106, obtains the spectral signal and absorbance of the spent catalyst sample, and sends them to the data processing device 111. Then, the second valve 115 and the third valve 116 are opened, and nitrogen is input into the first sample pool 106 to purge the first sample pool 106. The spent catalyst sample that has completed the detection in the first sample pool 106 is output from the first sample pool 106 via the first sample output pipeline 113. The data processing device 111 obtains the carbon deposition amount of the spent catalyst sample based on the absorbance of the spent catalyst sample and the preset regression analysis equation.

[0059] Similarly, the fourth valve 117 is opened, the regenerant sample falls into the second sample pool 109, and the fourth valve 117 is closed. After the regenerant sample is cooled for a preset time (e.g., 20 minutes), the second ultraviolet integrating sphere analyzer 110 detects the regenerant sample in the second sample pool 109, obtains the spectral signal and absorbance of the regenerant sample, and sends it to the data processing device 111. Then, the fifth valve 120 and the sixth valve 121 are opened, and nitrogen is input into the second sample pool 109 to purge the second sample pool 109. The regenerant sample that has completed the detection in the second sample pool 109 is output from the second sample pool 109 via the second nitrogen input pipeline 119. The data processing device 111 obtains the carbon deposition amount of the regenerant sample based on the absorbance of the regenerant sample and the preset regression analysis equation.

[0060] It can be understood that the methanol to olefins system provided in the embodiment of the present application includes a reactor 101, a regenerator 102, a spent agent delivery pipeline 103, a regenerant delivery pipeline 104, a first sampling pipeline 105, a first sample pool 106, a first ultraviolet integrating sphere analyzer 107, a second sampling pipeline 108, a second sample pool 109, a second ultraviolet integrating sphere analyzer 110 and a data processing device 111; the outlet of the reactor 101 is connected to the inlet of the regenerator 102 through the spent agent delivery pipeline 103, and the outlet of the regenerator 102 is connected to the inlet of the reactor 101 through the regenerant delivery pipeline 104; the inlet of the first sampling pipeline 105 is connected to the The spent agent delivery pipeline 103 is connected, the outlet of the first sampling pipeline 105 is connected to the first inlet of the first sample pool 106, and the first ultraviolet integrating sphere analyzer 107 is used to detect the spent agent sample in the first sample pool 106; the inlet of the second sampling pipeline 108 is connected to the regenerant delivery pipeline 104, the outlet of the second sampling pipeline 108 is connected to the first inlet of the second sample pool 109, and the second ultraviolet integrating sphere analyzer 110 is used to detect the regenerant sample in the second sample pool 109; the first ultraviolet integrating sphere analyzer 107 and the second ultraviolet integrating sphere analyzer 110 are both connected to the data processing device 111. Based on the methanol to olefins system provided in the embodiment of the present application, the carbon deposition amount of the regenerant and spent agents can be detected online in real time, so that the operating parameters can be adjusted in time.

[0061] Based on the methanol to olefins system provided in the above embodiment of the present application, the embodiment of the present application also provides a control method for the methanol to olefins system. It can be understood that the methanol to olefins system provided in the embodiment of the present application may include other well-known components, such as a raw material tank, a heat exchanger, etc., in addition to the above components. Figure 2 As shown, the control method may include the following steps:

[0062] Step 201, control the first ultraviolet integrating sphere analyzer to detect the spent agent sample in the first sample pool to obtain the spent agent carbon deposit amount detection result, and control the second ultraviolet integrating sphere analyzer to detect the regenerant agent sample in the second sample pool to obtain the regenerant agent carbon deposit amount detection result.

[0063] The detection results of the carbon deposit amount of the spent agent and the carbon deposit amount of the regenerated agent are real-time detection results. The specific detection process of the carbon deposit amount of the spent agent and the carbon deposit amount of the regenerated agent can refer to the above content and will not be repeated here.

[0064] Step 202, determining whether the spent agent carbon deposit amount detection result is within a target spent agent carbon deposit amount range, and determining whether the regeneration agent carbon deposit amount detection result is within a target regeneration agent carbon deposit amount range.

[0065] In specific implementation, a first model can be established between the carbon deposit amount of the spent agent, the carbon deposit amount of the regenerated agent and the product performance, and then based on the first model, the carbon deposit amount of the spent agent and the carbon deposit amount of the regenerated agent corresponding to the required product performance are determined, and the target carbon deposit amount range of the spent agent is determined according to the carbon deposit amount of the spent agent corresponding to the required product performance, and the target carbon deposit amount range of the regenerated agent is determined according to the carbon deposit amount of the regenerated agent corresponding to the required product performance.

[0066] Among them, product performance can include methanol consumption per unit, ethylene production, propylene production, C4 production, C5 production, etc.

[0067] The carbon deposit amount of spent agent, the carbon deposit amount of regenerated agent and the product performance used to establish the first model can all be historical data. In order to make the first model more accurate, historical data corresponding to a longer operating cycle can be selected for modeling, such as historical data corresponding to an operating cycle of not less than 1 year, so that more data is used for modeling and the model is more accurate. The first model can be a multivariate second-order model, which can be specifically expressed as a polynomial formula.

[0068] The required product performance can be selected according to actual needs, for example, the required product performance can be the optimal product performance. After determining the amount of spent agent carbon deposits and the amount of regeneration agent carbon deposits corresponding to the required product performance based on the first model, appropriate expansion can be performed on the amount of spent agent carbon deposits and the amount of regeneration agent carbon deposits corresponding to the required product performance, respectively, to obtain the target spent agent carbon deposit amount range and the target regeneration agent carbon deposit amount range. For example, the target spent agent carbon deposit amount range can be obtained by expanding by ±5% on the basis of the spent agent carbon deposit amount corresponding to the required product performance; the target regeneration agent carbon deposit amount range can be obtained by expanding by ±5% on the basis of the regeneration agent carbon deposit amount corresponding to the required product performance.

[0069] Step 203: If the spent catalyst carbon deposition amount detection result is within the target spent catalyst carbon deposition amount range, and the regeneration agent carbon deposition amount detection result is within the target regeneration agent carbon deposition amount range, then the operating parameters of the methanol to olefins system are not adjusted.

[0070] Among them, the operating parameters may include reaction storage, regeneration storage, circulation volume, regeneration air volume, methanol feed volume, reactor temperature, regenerator temperature, etc.

[0071] When the spent catalyst carbon deposition amount detection result is within the target spent catalyst carbon deposition amount range, and the regeneration agent carbon deposition amount detection result is within the target regeneration agent carbon deposition amount range, it means that the current system meets the production requirements and can produce products with the required performance. Therefore, the operating parameters of the methanol to olefins system do not need to be adjusted.

[0072] Step 204: If the spent catalyst carbon deposit amount detection result is not within the target spent catalyst carbon deposit amount range, or the regeneration agent carbon deposit amount detection result is not within the target regeneration agent carbon deposit amount range, then the operating parameters of the methanol to olefins system are adjusted.

[0073] When the spent catalyst carbon deposit amount detection result is not within the target spent catalyst carbon deposit amount range, or the regeneration agent carbon deposit amount detection result is not within the target regeneration agent carbon deposit amount range, that is, as long as one of them does not meet the target range, it means that the current production requirements are not met and products with the required performance cannot be produced. Therefore, the operating parameters of the methanol to olefins system are adjusted.

[0074] In specific implementation, a second model can be established between the carbon deposit amount of the spent agent, the carbon deposit amount of the regenerated agent and the operating parameters. When the detection result of the carbon deposit amount of the spent agent is not within the target carbon deposit amount range of the spent agent, or the detection result of the carbon deposit amount of the regenerated agent is not within the target carbon deposit amount range of the regenerated agent, a control strategy can be determined based on the second model, and the operating parameters of the methanol to olefins system can be adjusted based on the control strategy.

[0075] Among them, the carbon deposit amount of spent agent, the carbon deposit amount of regenerated agent and the operating parameters used to establish the second model can all be historical data. In order to make the second model more accurate, historical data corresponding to a longer operating cycle can be selected for modeling, such as historical data corresponding to an operating cycle of not less than 1 year, so that more data is used for modeling and the model is more accurate. The second model can be a multivariate second-order model, which can be specifically expressed as a polynomial formula.

[0076] A first model is established between the carbon deposit amount of spent agent, the carbon deposit amount of regeneration agent and product performance, and a second model is established between the carbon deposit amount of spent agent, the carbon deposit amount of regeneration agent and operating parameters. The schematic diagram is shown in FIG. Figure 3 shown.

[0077] It can be understood that the target spent agent carbon deposit amount range and the target regeneration agent carbon deposit amount range corresponding to the operating parameter numerical range can be determined based on the second model, then, based on the current operating parameter numerical value and the target spent agent carbon deposit amount range and the target regeneration agent carbon deposit amount range corresponding to the operating parameter numerical range, the control strategy can be determined. Furthermore, the operating parameters of the methanol to olefins system can be controlled based on the control strategy so that the operating parameters are within the operating parameter numerical range corresponding to the target spent agent carbon deposit amount range and the target regeneration agent carbon deposit amount range.

[0078] In specific implementation, the above comparison and control process can be executed by a control device to achieve real-time automatic regulation.

[0079] In practical applications, the operating parameters of the MTO system are usually optimized during the production process to ensure or improve production efficiency. The MTO system also often needs to make major operating parameter adjustments due to market changes. In the prior art, the operating parameters are adjusted mainly based on the accumulated experience of the operators, and different operators have different experiences and different levels of understanding of the system, resulting in the system often requiring a long period to transition from one stable production state to another, and the adjustment usually has a lag. Based on the scheme provided in the above-mentioned embodiments of the present application, not only can the carbon deposit amount of the regenerated agent and the carbon deposit amount of the regenerated agent be detected in real time, but also it can be determined in time whether the operating parameters need to be adjusted and the control strategy can be determined in time, thereby greatly shortening the control cycle of the system, that is, the system can transition from one stable production state to another stable production state as soon as possible. As a result, the control efficiency can be greatly improved, and the production efficiency of methanol to olefins can be improved.

[0080] In addition, the solution provided by the embodiment of the present application can also reduce the probability of production fluctuations and production accidents as much as possible, thereby improving the reliability of the system's long-term operation.

[0081] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0082] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A methanol to olefins system, characterized in that: The methanol to olefins system comprises a reactor, a regenerator, a spent agent delivery pipeline, a regenerator delivery pipeline, a first sampling pipeline, a first sample pool, a first ultraviolet integrating sphere analyzer, a second sampling pipeline, a second sample pool, a second ultraviolet integrating sphere analyzer and a data processing device; The outlet of the reactor is connected to the inlet of the regenerator through the spent agent delivery pipeline, and the outlet of the regenerator is connected to the inlet of the reactor through the regenerator delivery pipeline; The inlet of the first sampling pipeline is connected to the raw agent delivery pipeline, the outlet of the first sampling pipeline is connected to the first inlet of the first sample pool, and the first ultraviolet integrating sphere analyzer is used to detect the raw agent sample in the first sample pool; The inlet of the second sampling pipeline is connected to the regenerant delivery pipeline, the outlet of the second sampling pipeline is connected to the first inlet of the second sample pool, and the second ultraviolet integrating sphere analyzer is used to detect the regenerant sample in the second sample pool; The first ultraviolet integrating sphere analyzer and the second ultraviolet integrating sphere analyzer are both connected to the data processing device.

2. The methanol to olefins system according to claim 1, characterized in that: The methanol to olefins system further includes a first valve, which is disposed on the first sampling pipeline.

3. The methanol to olefins system according to claim 2, characterized in that: The methanol to olefins system further includes a first sample output pipeline and a first nitrogen input pipeline, wherein the inlet of the first sample output pipeline is connected to the outlet of the first sample cell, and the outlet of the first nitrogen input pipeline is connected to the second inlet of the first sample cell.

4. The methanol to olefins system according to claim 3, characterized in that: The methanol to olefins system further includes a second valve and a third valve, wherein the second valve is arranged on the first sample output pipeline, and the third valve is arranged on the first nitrogen input pipeline.

5. The methanol to olefins system according to claim 1, characterized in that: The methanol to olefins system further includes a fourth valve, which is disposed on the second sampling pipeline.

6. The methanol to olefins system according to claim 5, characterized in that: The methanol to olefins system further includes a second sample output pipeline and a second nitrogen input pipeline, wherein the inlet of the second sample output pipeline is connected to the outlet of the second sample cell, and the outlet of the second nitrogen input pipeline is connected to the second inlet of the second sample cell.

7. The methanol to olefins system according to claim 6, characterized in that: The methanol to olefins system further includes a fifth valve and a sixth valve, wherein the fifth valve is disposed on the second sample output pipeline, and the sixth valve is disposed on the second nitrogen input pipeline.

8. A control method for a methanol to olefins system according to any one of claims 1 to 7, characterized in that: The control method comprises: Controlling the first ultraviolet integrating sphere analyzer to detect the spent agent sample in the first sample pool to obtain a detection result of the amount of carbon deposited on the spent agent, and controlling the second ultraviolet integrating sphere analyzer to detect the regenerant agent sample in the second sample pool to obtain a detection result of the amount of carbon deposited on the regenerant agent; Determine whether the result of the spent agent carbon deposit amount test is within the target spent agent carbon deposit amount range, and determine whether the result of the regeneration agent carbon deposit amount test is within the target regeneration agent carbon deposit amount range; If the spent catalyst carbon deposit amount detection result is within the target spent catalyst carbon deposit amount range, and the regeneration agent carbon deposit amount detection result is within the target regeneration agent carbon deposit amount range, the operating parameters of the methanol to olefins system are not adjusted; If the spent catalyst carbon deposit amount detection result is not within the target spent catalyst carbon deposit amount range, or the regeneration agent carbon deposit amount detection result is not within the target regeneration agent carbon deposit amount range, the operating parameters of the methanol to olefins system are adjusted.

9. The control method according to claim 8, characterized in that: The control method further comprises: Establishing a first model between the carbon deposit amount of spent agent, the carbon deposit amount of regenerated agent and product performance; Based on the first model, determining the carbon deposit amount of spent agent and the carbon deposit amount of regenerated agent corresponding to the required product performance; The target range of carbon deposits of the spent agent is determined based on the carbon deposits of the spent agent corresponding to the required product performance, and the target range of carbon deposits of the regenerated agent is determined based on the carbon deposits of the regenerated agent corresponding to the required product performance.

10. The control method according to claim 8, characterized in that: The control method further comprises: A second model is established between the carbon deposit amount of the spent catalyst, the carbon deposit amount of the regenerated catalyst and the operating parameters of the methanol to olefins system; When the detection result of the carbon deposit amount of the spent agent is not within the target spent agent carbon deposit amount range, or the detection result of the carbon deposit amount of the regenerated agent is not within the target regenerated agent carbon deposit amount range, a control strategy is determined based on the second model, and the operating parameters of the methanol to olefins system are adjusted based on the control strategy.

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