A rectification purification device and method for high-purity sulfur dioxide production

Abstract

The application relates to the technical field of sulfur dioxide purification, in particular to a rectification and purification device and method for high-purity sulfur dioxide production, which comprises the following steps: in the process of rectification and purification of sulfur dioxide, temperature vectors of adjacent positions in a rectification tower at each moment are composed, the similarity between each temperature vector and the adjacent temperature vector thereof at each moment is analyzed, and a temperature similarity coefficient at each moment is determined; based on the correlation between the temperature similarity coefficient and the sulfur dioxide content in a historical time period of the current moment, a temperature adaptation degree of the current moment is determined; the heating temperature of the rectification tower at the current moment is adjusted by combining the temperature adaptation degree with the discrete degree and the change trend of the air pressure of the rectification tower in the historical time period of the current moment, and the heating temperature of the rectification tower at the next moment is obtained, so that the purification effect of sulfur dioxide is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sulfur dioxide purification, in particular to a rectification purification device and method for high-purity sulfur dioxide production. BACKGROUND

[0002] Sulfur dioxide (SO2) is a colorless gas with a pungent odor, widely used in the chemical industry, especially in the production of sulfuric acid. The presence of sulfur dioxide is also related to acid rain and air pollution in the environment, so its emissions are strictly controlled. Sulfur dioxide in industrial applications usually needs to be in a high-purity form, so rectification and purification is an important step in its production process.

[0003] The rectification and purification process of sulfur dioxide is based on its low boiling point, and through the rectification tower, the boiling point difference of different substances is used to separate sulfur dioxide from the mixed gas. However, if the temperature in the rectification tower is too high or too low, it will affect the purification effect of sulfur dioxide. If the temperature is too high, it may cause azeotropy of sulfur dioxide and other components, which cannot be effectively separated, affecting the purity of the final sulfur dioxide. If the temperature is too low, the evaporation speed of sulfur dioxide will slow down, resulting in a decrease in rectification efficiency.

[0004] In the prior art, the temperature in the rectification tower is usually fixed at a preset temperature. However, in actual operation, the temperature in the rectification tower is affected by many factors, such as fluctuations in the heat source, the effect of the cooling system, pressure changes, etc. The fixed preset temperature has the problem of insufficient adaptability and low precision, which affects the purification effect of sulfur dioxide. SUMMARY

[0005] In order to solve the above technical problems, the purpose of the present application is to provide a rectification and purification device and method for high-purity sulfur dioxide production, and the technical solution adopted is as follows:

[0006] In the first aspect, the present application provides a rectification and purification method for high-purity sulfur dioxide production, which comprises the following steps:

[0007] In the process of rectification and purification of sulfur dioxide, the temperature at each position and time in the rectification tower is collected, and the gas pressure and sulfur dioxide content at each time are collected.

[0008] The temperatures at adjacent positions at each time in the rectification tower are combined into a temperature vector, the similarity between each temperature vector and its adjacent temperature vector at each time is analyzed, and the temperature similarity coefficient at each time is determined.

[0009] Based on the correlation between the temperature similarity coefficient and the sulfur dioxide content in the historical time period of the current time, the temperature adaptability of the current time is determined.

[0010] Adjust the heating temperature of the rectifying tower at the current moment according to the dispersion degree and the change trend of the air pressure in the historical time period of the current moment, and the temperature fitness degree, to obtain the heating temperature of the rectifying tower at the next moment.

[0011] In one embodiment, the temperature vector of the temperature of the adjacent positions in the rectifying tower at each moment comprises:

[0012] For each moment, the temperature collection positions in the rectifying tower are numbered in ascending order from top to bottom, and the temperature of each serial number and the temperature of the position adjacent to the next serial number form a temperature vector of the position of each serial number.

[0013] In one embodiment, the determination of the temperature similarity coefficient comprises:

[0014] Calculate the similarity of the temperature vector of each serial number position and the temperature vector of the position adjacent to the next serial number, and take the average of all the similarities at each moment as the temperature similarity coefficient at each moment.

[0015] In one embodiment, the similarity is the cosine similarity of the temperature vector of each serial number position and the temperature vector of the position adjacent to the next serial number.

[0016] In one embodiment, the determination of the temperature fitness degree comprises:

[0017] All the temperature similarity coefficients in the historical time period of the current moment form a temperature similarity sequence, and all the sulfur dioxide contents in the historical time period of the current moment form a sulfur dioxide content sequence.

[0018] The temperature fitness degree is the Pearson correlation coefficient of the temperature similarity sequence and the sulfur dioxide content sequence.

[0019] In one embodiment, the heating temperature of the rectifying tower at the next moment is obtained by:

[0020] Linearly fitting all the air pressures in the historical time period of the current moment to obtain the slope of the fitting straight line;

[0021] Adjust the heating temperature of the rectifying tower at the current moment according to the slope, the dispersion degree, and the temperature fitness degree, to obtain the heating temperature of the rectifying tower at the next moment.

[0022] In one embodiment, the heating temperature of the rectifying tower at the next moment is obtained by:

[0023] Calculate the ratio of the dispersion degree and the temperature fitness degree, determine the product of the sign result of the slope and the normalized value of the ratio, and the heating temperature of the rectifying tower at the next moment is negatively correlated with the product.

[0024] In one embodiment, the heating temperature of the distillation column at the next time is the difference between the heating temperature of the distillation column at the current time and the product.

[0025] In one embodiment, the dispersion degree is the standard deviation of all the air pressures in the historical time period at the current time.

[0026] In the second aspect, the embodiments of the present application also provide a distillation purification device for high-purity sulfur dioxide production, which comprises a sulfur dioxide cylinder (1), a pre-cooler (2), an adsorption bed (3), a filter (4), a liquefier (5) connected in sequence, and finally connected to the bottom of a distillation column (7). The upper part of the distillation column (7) is connected to a heat exchanger (8), and the purified sulfur dioxide condensed by the heat exchanger is led to a high-purity sulfur dioxide product storage tank (10). A refrigerator (6) is connected between the liquefier (5) and the heat exchanger (8). The top of the heat exchanger (8) is provided with an emptying channel (9) connected to a lye absorption device (11). The distillation column (7) comprises:

[0027] A temperature sensor is arranged to collect the temperature at each position and time in the distillation column.

[0028] A pressure sensor is arranged to collect the air pressure at each time in the distillation column.

[0029] A sulfur dioxide detector is arranged to collect the sulfur dioxide content at each time in the distillation column.

[0030] A temperature control module is arranged to form a temperature vector of the temperatures of adjacent positions at each time in the distillation column, analyze the similarity between each temperature vector and its adjacent temperature vector at each time, and determine a temperature similarity coefficient at each time.

[0031] Based on the correlation between the temperature similarity coefficient and the sulfur dioxide content in the historical time period at the current time, a temperature adaptation degree at the current time is determined.

[0032] The heating temperature of the distillation column at the current time is adjusted by the dispersion degree and the change trend of the air pressure in the historical time period at the current time, combined with the temperature adaptation degree, to obtain the heating temperature of the distillation column at the next time.

[0033] The present application has at least the following beneficial effects:

[0034] The application improves the identification precision of the temperature distribution uniformity in the rectifying tower, captures the local temperature anomaly in the rectifying tower in real time, and avoids the defect that single-point temperature measurement is not sensitive to temperature gradient distribution. Further, based on the correlation between the temperature similarity coefficient and the sulfur dioxide content in the historical time period of the current time, the temperature adaptation degree of the current time is determined. The determination of the temperature adaptation degree strengthens the associated adaptation of the temperature in the rectifying tower and the sulfur dioxide content, reflects the appropriate degree of the heating temperature in the rectifying tower at the current time, improves the robustness of the sulfur dioxide purity control, and improves the reliability of the temperature control in the rectifying tower. By adjusting the heating temperature of the rectifying tower at the current time through the dispersion degree and the change trend of the gas pressure in the historical time period of the current time in combination with the temperature adaptation degree, the heating temperature of the rectifying tower at the next time is obtained, the accuracy of the temperature control in the rectifying tower is improved, the volatilization behavior of each component in the rectifying tower is ensured to meet the expectation, the separation process of sulfur dioxide is more efficient, the purity of the purified sulfur dioxide is ensured, and higher-quality sulfur dioxide is obtained. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0036] Figure 1 A step flow chart of a rectification purification method for high-purity sulfur dioxide production provided by an embodiment of the present application;

[0037] Figure 2 A schematic diagram of a rectification purification device for high-purity sulfur dioxide production. DETAILED DESCRIPTION

[0038] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the specific implementation, structure, features and effects of the rectification purification device and method for high-purity sulfur dioxide production according to the present application are described in detail as follows by combining with the drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0040] The application provides a distillation purification device and method for high-purity sulfur dioxide production.

[0041] Please refer to Figure 1 , which shows a step flow chart of a distillation purification method for high-purity sulfur dioxide production provided by an embodiment of the application, which comprises the following steps:

[0042] S1, in the process of purifying sulfur dioxide by distillation, the temperature of each position in the distillation column at each time is collected, and the gas pressure and sulfur dioxide content at each time are collected.

[0043] In the process of purifying sulfur dioxide by distillation, in order to realize the collection of data in the distillation process and improve the purity of sulfur dioxide in the distillation, N temperature sensors are uniformly arranged in the distillation column from top to bottom in this embodiment, and the temperature distribution in the distillation column is obtained in real time. Secondly, a pressure sensor is arranged at the middle position of the distillation column to obtain the gas pressure value in the distillation column in real time. In addition, the sulfur dioxide detector is used to obtain the sulfur dioxide content in the distillation column in real time.

[0044] It should be noted that the number of temperature sensors is set to N = 8, and the temperature, gas pressure and sulfur dioxide content in the distillation column are collected synchronously. The collection time interval is set to 30s in this embodiment, and the collection time interval and the number of sensors can be set by the actual situation, which is not limited in this embodiment.

[0045] The N temperature sensors are numbered in sequence from natural number 1 from top to bottom in the distillation column, that is, the temperature sensor at the top of the distillation column is numbered 1, and the next temperature sensor closest to the top temperature sensor is numbered 2, and accordingly, the serial number of each temperature sensor in the distillation column can be obtained.

[0046] S2, the temperature of adjacent positions at each time in the distillation column is composed into a temperature vector, the similarity between each temperature vector and its adjacent temperature vector at each time is analyzed, and the temperature similarity coefficient at each time is determined.

[0047] The main principle of purifying sulfur dioxide in the mixed condensate in the distillation column is: using the difference in boiling point of different substances in the mixed liquid, the low-boiling-point components are volatilized by heating in the heating process, and the high components are not easy to volatilize, so that the concentration of low-boiling-point components in the gas phase gradually increases, and the concentration of high-boiling-point components in the liquid phase increases, thereby realizing the purification of sulfur dioxide.

[0048] In the rectification process, the temperature of the rectification tower determines the distribution ratio of each component in the gas-liquid two-phase, and the use of boiling point difference makes the ascending vapor contact with the reflux liquid in the tower in sections, so that the heavy component part in the gas phase is condensed, and the light component part in the liquid phase is gasified, so as to realize the purification of light components in the gas phase and heavy components in the liquid phase. In liquefied sulfur dioxide, oxygen, nitrogen, compared with sulfur dioxide, belong to light components, and their boiling points are much lower than that of sulfur dioxide, so they will be gasified first, and there is also carbon dioxide in it, which is an azeotrope with sulfur dioxide under normal circumstances, making separation more difficult, and the temperature in the rectification tower needs to be accurately controlled under pressure control.

[0049] Based on the above analysis, in the sulfur dioxide rectification and purification process, the temperature needs to be accurately controlled to ensure that the temperature of each position in the rectification tower adapts to the gas-liquid flat and mass transfer requirements, while maintaining the heat balance of the whole rectification tower. First, for a single sampling time, since the temperature between each plate layer in the rectification tower basically presents a stable gradient distribution, and the gradient distribution between each plate layer is basically consistent, it is beneficial for the gas-liquid two-phase to contact multiple times, so that impurities can be efficiently separated. However, when the reflux ratio and evaporation amount between each plate layer are different, the greater the overall deviation, the lower the temperature distribution consistency in the rectification tower, and the greater the impact on the purification effect of sulfur dioxide.

[0050] Therefore, for each time, the temperature of each sequence number and its adjacent next sequence number position forms a temperature vector of each sequence number position, for example, the values of the 1st and 2nd temperature sensors form a temperature vector, and the values of the 2nd and 3rd temperature sensors form another temperature vector, and the two temperature vectors are adjacent to each other. For each time, N temperature sensors can obtain N-1 temperature vectors.

[0051] The similarity between each temperature vector and its adjacent temperature vector at each time is analyzed to determine the temperature similarity coefficient at each time. The specific calculation method in this embodiment is:

[0052] In the formula, A represents the temperature similarity coefficient at each time, N represents the number of temperature sensors in the rectification tower, cos() represents the cosine similarity calculation function, and respectively represent the i-th and i+1-th temperature vectors at each time.

[0053] It should be understood that the embodiment measures the temperature characteristics of the corresponding plate layer represented by two adjacent temperature sensors in the distillation column by the temperature vector, and reflects the degree of inconsistency of the temperature distribution in the distillation column according to the similarity of the adjacent temperature vectors. The higher the overall temperature distribution gradient consistency in the distillation column is, the greater the cosine similarity value is, and the more disordered the overall temperature distribution is, the smaller the cosine similarity value is, so that the temperature similarity coefficient at each sampling time can be obtained.

[0054] S3, determining the temperature adaptation degree of the current moment based on the correlation between the temperature similarity coefficient and the sulfur dioxide content in the historical time period of the current moment.

[0055] The temperature similarity coefficient at a single moment reflects the consistency of the temperature in the distillation column at a single sampling moment, so theoretically, the higher the uniformity of the temperature gradient from top to bottom in the distillation column is, the more conducive to the separation of light components and heavy components in the gas-liquid two-phase of sulfur dioxide, so that the concentration of the components of sulfur dioxide in the mixed liquid gradually increases.

[0056] Therefore, for the current moment, the temperature similarity coefficients and the sulfur dioxide contents in the historical time period of the current moment are obtained, all the temperature similarity coefficients in the historical time period of the current moment are arranged in time sequence to form a temperature similarity sequence, and all the sulfur dioxide contents in the historical time period of the current moment are arranged in time sequence to form a sulfur dioxide content sequence. In the embodiment, the previous 5 minutes of the current moment in the historical time period can be set by the implementer according to the actual situation, and the embodiment does not limit the length of the historical time period. It should be noted that for the time period with insufficient length, in order to ensure the reliability of the temperature regulation of the distillation column, the temperature regulation of the distillation column is not performed for such time period.

[0057] In order to avoid the influence of the numerical value size on the calculation, the temperature similarity sequence and the sulfur dioxide content sequence obtained at the current moment are normalized by using the maximum-minimum value method respectively. The Pearson correlation coefficient of the normalized temperature similarity sequence and the sulfur dioxide content sequence at the current moment is used as the temperature adaptation degree of the current moment. The maximum-minimum value method and the Pearson correlation coefficient are both known technologies, and the implementer can select other feasible normalization methods and correlation calculation methods, such as Z-score standardization and cosine similarity, and the embodiment does not limit this.

[0058] For temperature adaptation degree measurement, the focus is on the influence of the temperature distribution in the rectifying tower on the purification effect of sulfur dioxide. In theory, the stronger the gradient consistency of the temperature distribution in the rectifying tower, the more conducive to the purification of sulfur dioxide in the rectifying tower, and the higher the purity obtained, and therefore the stronger the correlation between the temperature similarity sequence and the sulfur dioxide content sequence, indicating that the temperature adaptation degree in the rectifying tower is higher. Conversely, the greater the temperature fluctuation, the less conducive to the purification of sulfur dioxide in the rectifying tower, and the smaller the correlation between the temperature similarity sequence and the sulfur dioxide content sequence, and the smaller the value of the temperature adaptation degree obtained.

[0059] S4, adjusting the heating temperature of the rectifying tower at the current moment by the dispersion degree and the change trend of the gas pressure in the rectifying tower in the historical time period of the current moment, in combination with the temperature adaptation degree, to obtain the heating temperature of the rectifying tower at the next moment.

[0060] The above analysis process mainly aims at the temperature in the rectifying tower and the content of sulfur dioxide, to measure the adaptation degree of the temperature to the purification of sulfur dioxide in the rectifying tower. However, in the actual process, as the light components in the mixed liquid are gradually separated, the pressure value in the rectifying tower fluctuates slightly, and the pressure fluctuation will affect the temperature distribution in the rectifying tower, which may reduce the temperature difference between the plate layers in the rectifying tower, showing a false appearance of temperature consistency, resulting in a deviation of the obtained temperature adaptation degree from the actual situation. The embodiment further analyzes the pressure value in the rectifying tower, specifically:

[0061] For the current moment, the pressure in the distillation tower at each moment in the historical time period of the current moment is obtained, and all the pressure values in the distillation tower in the historical time period of the current moment are arranged in time sequence to form a pressure sequence. The greater the fluctuation degree of the pressure data in the historical time period, the greater the deviation of the temperature adaptation degree from the actual sulfur dioxide rectification and purification effect, and the more correction is needed.

[0062] Based on the above analysis, the embodiment adjusts the heating temperature in the rectifying tower in real time by the change trend and dispersion degree of the pressure sequence, in combination with the temperature adaptation degree, and the specific expression is:

[0063] In the formula, represents the target temperature value to be adjusted in the rectifying tower at t+1 moment, represents the heating temperature in the rectifying tower at the current t moment, sign() represents the sign function, i.e. the positive and negative of the value, represents the slope of the fitting straight line obtained by linear fitting of the pressure sequence at the current t moment, norm() represents the normalization function, and C represents the temperature adaptation degree at the current t moment, The dispersion degree of the pressure sequence at the current time t. The dispersion degree can be calculated in the form of variance, standard deviation, coefficient of variation, etc. In this embodiment, the standard deviation is used as the calculation method of the dispersion degree. In this embodiment, the least squares method is used for linear fitting of the pressure sequence. The implementer can select other feasible linear fitting algorithms.

[0064] Thus, the next time heating temperature of the rectifying tower at the current time can be obtained, and the heating temperature in the rectifying tower can be controlled in real time.

[0065] When the temperature in the rectifying tower is controlled, the adaptability of the temperature in the rectifying tower to the purification of sulfur dioxide is first considered. Generally, the higher the adaptability at the current time, the better the matching effect of the temperature distribution in the rectifying tower and the purification demand of sulfur dioxide, and the less the temperature needs to be controlled. When there is pressure fluctuation, the higher the temperature adaptability when the pressure fluctuates, the more likely it is that the false adaptability is presented by the temperature and purity in the rectifying tower not increasing. Thus, the step of temperature adjustment is controlled by using the fluctuation of the pressure sequence.

[0066] In addition, for the adjustment direction of the heating temperature in the rectifying tower, the change of the pressure sequence at the current time is mainly considered. If the pressure sequence presents an increasing trend, it means that the pressure value in the rectifying tower gradually increases, which is not conducive to the separation of light components at the top of the rectifying tower, and part of the light components may be re-pressed into the mixed solution. Therefore, at this time, the pressure in the rectifying tower needs to be gradually reduced by reducing the temperature. On the contrary, when the pressure in the rectifying tower presents a gradually decreasing trend, in order to break the azeotropic condition of sulfur dioxide and carbon dioxide, the heating temperature value of the rectifying tower needs to be increased to break the balance state of the gas-liquid two-phase and promote the purification.

[0067] Based on the same inventive concept as the above method, the embodiment of the present application also provides a rectification purification device for high-purity sulfur dioxide production, the rectification purification device comprises a sulfur dioxide cylinder 1, wherein the sulfur dioxide in the cylinder is mainly prepared in an industrialized manner with a purity of 99.6% to 99.9%, the sulfur dioxide cylinder 1 is connected with a pre-cooler 2, four adsorption beds 3, a filter 4, a liquefier 5 and finally connected to the bottom of a rectification tower 7 in sequence, wherein the four adsorption beds are connected with each other in series through pipelines and valves to form a plurality of adsorption bed groups; a heat exchanger 8 with internal low-temperature cold liquid is arranged at the upper part of the rectification tower 7, the sulfur dioxide purified through heat exchange and condensation is led to a high-purity sulfur dioxide product storage tank 10, a refrigerator 6 is connected between the liquefier 5 and the heat exchanger 8, an emptying channel 9 is arranged at the top of the heat exchanger 8 and connected with a lye absorption device 11 to realize waste gas absorption. After the sulfur dioxide is purified for multiple times, the purity of the sulfur dioxide in the high-purity sulfur dioxide product storage tank 10 is 99.9998%, which meets the industrial demand of 5N grade preparation. In addition, the rectification tower 7 further comprises:

[0068] a temperature sensor for collecting the temperature of each position at each time in the rectification tower;

[0069] a pressure sensor for collecting the air pressure at each time in the rectification tower;

[0070] a sulfur dioxide detector for collecting the sulfur dioxide content at each time in the rectification tower;

[0071] a temperature control module for forming a temperature vector of the temperatures of adjacent positions at each time in the rectification tower, analyzing the similarity between each temperature vector and its adjacent temperature vector at each time, and determining a temperature similarity coefficient at each time;

[0072] determining a temperature adaptation degree at the current time based on the correlation between the temperature similarity coefficient and the sulfur dioxide content in a historical time period of the current time;

[0073] adjusting the heating temperature of the rectification tower at the current time by combining the temperature adaptation degree with the dispersion degree and the change trend of the air pressure in the historical time period of the current time, and obtaining the heating temperature of the rectification tower at the next time. The schematic diagram of the rectification purification device for high-purity sulfur dioxide production is shown in Figure 2 .

[0074] It should be noted that the above-mentioned sequence of the embodiments of the present application is only for description, and does not represent the advantages and disadvantages of the embodiments. Moreover, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multi-task processing and parallel processing are also possible or can be advantageous.

[0075] The various embodiments in the specification are described in progressive manner, and the same or similar parts between the various embodiments can be mutually referred to, and each embodiment focuses on the difference from other embodiments.

[0076] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for distillation purification of high-purity sulfur dioxide, characterized in that, The method includes the following steps: During the distillation and purification of sulfur dioxide, the temperature at each longitudinal position and time in the distillation column was collected, as well as the gas pressure and sulfur dioxide content in the distillation column at each time. For each time point, the temperature acquisition locations in the distillation column are numbered in ascending order from top to bottom. Each number is combined with the temperature of the next adjacent number to form a temperature vector for each number. The cosine similarity between each number and the temperature vector of the next adjacent number is calculated. The mean of all the cosine similarities at each time point is taken as the temperature similarity coefficient for each time point. Based on the correlation between the temperature similarity coefficient and sulfur dioxide content within the historical time period at the current moment, the temperature fit at the current moment is determined. By analyzing the dispersion and trend of the gas pressure over the historical time period at the current moment, and combining this with the temperature adaptability, the heating temperature of the distillation column at the current moment is adjusted to obtain the heating temperature of the distillation column at the next moment. The determination of the temperature adaptability includes: The temperature similarity coefficients of all the aforementioned temperature coefficients within the historical time period at the current moment are combined into a temperature similarity sequence, and the sulfur dioxide content of all the sulfur dioxide content within the historical time period at the current moment is combined into a sulfur dioxide content sequence. The temperature fit is the Pearson correlation coefficient between the temperature similarity sequence and the sulfur dioxide content sequence.

2. The distillation purification method for producing high-purity sulfur dioxide as described in claim 1, characterized in that, The process of obtaining the heating temperature of the distillation column at the next moment includes: The slope of the fitted line is obtained by linearly fitting all the air pressures within the historical time period at the current moment. By combining the slope, the degree of dispersion, and the temperature adaptability, the heating temperature of the distillation column at the current moment is adjusted to obtain the heating temperature of the distillation column at the next moment.

3. The distillation purification method for producing high-purity sulfur dioxide as described in claim 2, characterized in that, The process of obtaining the heating temperature of the distillation column at the next moment includes: Calculate the ratio of the degree of dispersion to the temperature fit, determine the product of the sign result of the slope and the normalized value of the ratio, and the heating temperature of the distillation column at the next moment is negatively correlated with the product.

4. The distillation purification method for producing high-purity sulfur dioxide as described in claim 3, characterized in that, The heating temperature of the distillation column at the next moment is the difference between the heating temperature of the distillation column at the current moment and the product of these two values.

5. The distillation purification method for producing high-purity sulfur dioxide as described in claim 1, characterized in that, The degree of dispersion is the standard deviation of all the air pressures within the historical time period at the current moment.

6. A distillation purification apparatus for producing high-purity sulfur dioxide, realizing the distillation purification method for producing high-purity sulfur dioxide as described in claim 1, wherein the distillation purification apparatus comprises a sulfur dioxide cylinder (1), which is sequentially connected to a precooler (2), an adsorption bed (3), a filter (4), and a liquefier (5), and finally connected to the bottom of a distillation column (7). A heat exchanger (8) is connected to the upper part of the distillation column (7). The purified sulfur dioxide after heat exchange and condensation is directed to a high-purity sulfur dioxide product storage tank (10). A refrigeration unit (6) is connected between the liquefier (5) and the heat exchanger (8). An venting channel (9) is provided at the top of the heat exchanger (8) and connected to an alkali absorption device (11). The apparatus is characterized in that... The distillation column (7) includes: Temperature sensors are used to collect the temperature at various longitudinal locations within the distillation column at different times. Pressure sensor, used to collect gas pressure inside the distillation column at various times; The sulfur dioxide detector is used to collect the sulfur dioxide content in the distillation column at various times. The temperature control module is used to form a temperature vector from the temperatures of adjacent positions at different times in the distillation column, analyze the similarity between each temperature vector at each time and its neighboring temperature vectors, and determine the temperature similarity coefficient at each time. Based on the correlation between the temperature similarity coefficient and sulfur dioxide content within the historical time period at the current moment, the temperature fit at the current moment is determined. By analyzing the dispersion and trend of the gas pressure over the historical time period at the current moment, and combining this with the temperature adaptability, the heating temperature of the distillation column at the current moment is adjusted to obtain the heating temperature of the distillation column at the next moment.

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