Dry trapping device and trapping method for isophthalonitrile

Abstract

The invention provides an isophthalonitrile dry trapping device and trapping method.The isophthalonitrile dry trapping device comprises a trapping chamber, the trapping chamber is provided with a temperature adjusting sleeve, the temperature adjusting sleeve is used for adjusting the temperature of the inner wall of the trapping chamber, the temperature adjusting sleeve is filled with a heat exchange medium, the temperature adjusting sleeve is connected with a heat exchange medium inlet pipe, and the heat exchange medium inlet pipe is connected with a first control valve; the interior of the trapping chamber is divided into a plurality of trapping areas, a first temperature sensor is arranged on the inner wall of each trapping area, a gas inlet area and a gas outlet area of each trapping area are each provided with a sensor mounting frame, and second temperature sensors are mounted on the sensor mounting frames and used for detecting the air temperature of the positions where the second temperature sensors are located; the control device is electrically connected with the first temperature sensor, the second temperature sensor, the first control valve and the alarm device. According to the device, when the heat exchange state in the trapping area is abnormal, an alarm is given in time through the alarm device, an operator is reminded of maintenance and adjustment, and therefore reliable work of the device is guaranteed, and the trapping efficiency is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of syngas separation and treatment, and particularly to an isophthalonitrile dry capture device and a capture method. Background Art

[0002] Isophthalonitrile is a white needle crystal, slightly soluble in hot water, soluble in hot ethanol, ether, benzene and chloroform [1]. It is used to produce plastics, synthetic fibers, pesticides (chlorothalonil), and epoxy resin curing agents, etc.

[0003] Currently, the most important method for synthesizing isophthalonitrile is to react m-xylene with ammonia and oxygen through ammoxidation under the action of a catalyst. At present, the main capture methods for producing isophthalonitrile products by ammoxidation in China are thin-wall capture and water spray capture.

[0004] Existing isophthalonitrile dry capture devices, such as the dry capture device in the automatic discharging process of isophthalonitrile dry capture in 107513026B, have the following problems:

[0005] There is a lack of a device for detecting the gas temperature in the capture area of the capture device, and it is impossible to determine the heat exchange state in the capture chamber based on the detection results of the device for detecting the gas temperature in the capture area, so it is impossible to timely discover the abnormal heat exchange state in the capture area of the capture device, thus affecting the capture efficiency of the capture device. Summary of the Invention

[0006] The present invention provides an isophthalonitrile dry capture device and a capture method to solve the technical problems raised in the above background art.

[0007] To solve the above technical problems, the present invention discloses an isophthalonitrile dry capture device, including a capture chamber, and the capture chamber is provided with a mixed gas inlet.

[0008] The capture chamber is provided with a temperature adjustment sleeve for adjusting the temperature of the inner wall of the capture chamber. The temperature adjustment sleeve is filled with a heat exchange medium, and the temperature adjustment sleeve is connected with a heat exchange medium inlet pipe. The heat exchange medium inlet pipe is connected to a heat exchange medium source, and the heat exchange medium inlet pipe is connected with a first control valve. The interior of the capture chamber is divided into several capture areas. A first temperature sensor is arranged on the inner wall of the capture chamber of each capture area. Sensor mounting frames are arranged in the intake area and the outlet area of each capture area, and a second temperature sensor is mounted on the sensor mounting frame for detecting the air temperature at its location.

[0009] The control device is electrically connected to the first temperature sensor, the second temperature sensor, the first control valve, and the alarm device respectively.

[0010] Preferably, it further includes: a setting module for setting the set temperature of the capture area, and the setting module is electrically connected to the control device.

[0011] The alarm device includes: a first early warning module, which is used to give an early warning when the detection value of the second temperature sensor is not within the preset range of the set temperature on the inner wall of the trapping chamber.

[0012] Preferably, it further includes:

[0013] A first acquisition module, which is used to acquire: the heat transfer coefficient of the mixed gas containing gaseous isophthalonitrile with the inner wall of the trapping area, and the density of the mixed gas containing gaseous isophthalonitrile;

[0014] A flow rate sensor, and a flow rate sensor is also installed on the sensor mounting rack. The flow rate sensor is used to detect the gas flow rate at its location;

[0015] A first storage module, which stores the detection values of the first temperature sensor, the second temperature sensor, and the flow rate sensor;

[0016] The alarm device further includes: an evaluation and early warning device. The evaluation and early warning device works once every first time interval. The evaluation and early warning device includes;

[0017] A second acquisition module, which is used to acquire the detection values of the first temperature sensor, the second temperature sensor, and the flow rate sensor within the latest first historical duration;

[0018] A first calculation module, which is used to calculate the actual temperature drop loss coefficient of the mixed gas containing gaseous isophthalonitrile in each trapping area of the current first historical duration based on the first acquisition module and the second acquisition module;

[0019] A first determination module, which is used to determine that the trapping area where the actual temperature drop loss coefficient of the mixed gas containing gaseous isophthalonitrile is greater than or equal to the preset temperature drop loss coefficient is an abnormal heat exchange trapping area;

[0020] A second early warning module, which is used to give an early warning according to the numbers and quantities of the abnormal heat exchange trapping areas.

[0021] Preferably, the first calculation module calculates based on the following formula:

[0022]

[0023] P i1 is the actual temperature drop loss coefficient of the mixed gas containing gaseous isophthalonitrile in the i-th trapping area of the current first historical duration; T i1 is the average detection value of all the second temperature sensors in the intake area of the i-th trapping area of the current first historical duration; T i2 is the average detection value of all the second temperature sensors in the outlet area of the i-th trapping area of the current first historical duration; T i0is the average detected value of all the first temperature sensors in the i-th capture area of the current first historical duration; v i is the average detected value of all the flow rate sensors in the i-th capture area of the current first historical duration; μ is the heat transfer coefficient between the mixed gas containing gaseous isophthalonitrile and the inner wall of the capture area; ρ is the density of the mixed gas containing gaseous isophthalonitrile; K is the heat transfer efficiency between the mixed gas containing gaseous isophthalonitrile in the capture area and the inner wall of the capture area; S i is the cross-sectional area of the i-th capture area; c is the average specific heat capacity of the mixed gas containing gaseous isophthalonitrile; S i1 is the average value of the inner wall area per unit length of the mixed gas in the i-th capture area along the flow direction; α(v i ) is the mixed gas containing gaseous isophthalonitrile with v i The total time passing through the i-th capture area.

[0024] Preferably, the evaluation and warning device further includes:

[0025] The second storage module: stores the target database, and the target database is the mapping database of the temperature of the mixed gas containing gaseous isophthalonitrile - the flow rate of the mixed gas - the temperature of the inner wall of the capture area - the test value of the precipitation amount of isophthalonitrile per unit time;

[0026] The second calculation module: is used to calculate the satisfaction coefficient of the precipitation amount of isophthalonitrile per unit time in each capture area of the current first historical duration based on the target database;

[0027] The third warning module: is used to give a warning when the satisfaction coefficient of the precipitation amount of isophthalonitrile per unit time in any capture area of the current first historical duration is less than the preset satisfaction coefficient of the precipitation amount per unit time.

[0028] Preferably, the first acquisition module is further used to acquire: the required temperature range of the inner wall of the capture area corresponding to the mixed gas containing gaseous isophthalonitrile;

[0029] The isophthalonitrile dry capture device further includes: a temperature control module, and the temperature control module includes:

[0030] The first calculation unit: is used to calculate the heat transfer efficiency of each capture area of the current first historical duration when the second warning module does not give a warning and the third warning module gives a warning;

[0031] The prediction unit: selects several target integer temperatures within the required temperature range of the inner wall of the capture area corresponding to the mixed gas containing gaseous isophthalonitrile; determines the predicted temperature of the intake area and the predicted temperature of the outlet area of each capture area at each target integer temperature based on the first calculation unit;

[0032] The first determination unit: configured to obtain, based on the target database, the test value of the amount of phthalonitrile precipitated per unit time corresponding to the predicted temperature of the intake area and the predicted temperature of the outlet area of each trapping area;

[0033] The second calculation unit: calculates the satisfaction coefficient of the comprehensive predicted amount of phthalonitrile precipitated per unit time for each target integer temperature based on the first determination unit;

[0034] The screening unit is configured to select the target integer temperature with the satisfaction coefficient of the comprehensive predicted amount of phthalonitrile precipitated per unit time greater than 1.2 as the adjusted target temperature;

[0035] During the process from the end of the current first historical period to the start of the next first historical period, the control device controls the actual set temperature of the setting module to be the adjusted target temperature.

[0036] Preferably, the second calculation unit calculates based on the following formula:

[0037]

[0038] E ik is the satisfaction coefficient of the predicted amount of phthalonitrile precipitated per unit time in the i-th trapping area at the k-th target integer temperature; T ik1 is the predicted temperature of the intake area of the i-th trapping area at the k-th target integer temperature; T ik2 is the predicted temperature of the outlet area of the i-th trapping area at the k-th target integer temperature; f(T ik1 , v i , T ik ) combined with T ik1 , v i , T ik and the target database to obtain the test value of the amount of phthalonitrile precipitated per unit time; f(T ik2 , v i , T ik ) combined with T ik2 , v i , T ik and the target database to obtain the test value of the amount of phthalonitrile precipitated per unit time; Q i is the required amount of phthalonitrile precipitated per unit time in the i-th trapping area.

[0039] The present invention also provides a dry phthalonitrile trapping method, and the trapping method is carried out by using the dry phthalonitrile trapping device as described above. The dry phthalonitrile trapping method includes:

[0040] Step S1: Introduce a heat exchange medium into the temperature adjustment jacket, and adjust the first control valve to make the temperature of the inner wall of the trapping chamber within a preset range of the set temperature of the trapping area;

[0041] Step S2: Start the spiral discharging device at the bottom of the trapping chamber;

[0042] Step S3: Introduce the mixed gas containing gaseous isophthalonitrile into the mixed gas inlet for dry trapping of isophthalonitrile; during the dry trapping process, monitor and give early warning of the heat exchange state of the isophthalonitrile dry trapping device through the alarm device.

[0043] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] When the detected value of the second temperature sensor is not within the preset range of the set temperature of the inner wall of the trapping chamber, an early warning is given through the first early warning module (this also indicates that the heat exchange state inside the trapping chamber is abnormal), reminding the operator to repair and adjust to ensure that the temperature of the inner wall of the trapping chamber meets the requirements, thereby ensuring the dry trapping effect of isophthalonitrile.

[0046] The second temperature sensor is used to detect the air temperature in the trapping area where it is located, and the first temperature sensor is used to detect the temperature of the inner wall of the trapping chamber in the trapping area. The heat exchange state in the trapping area can be evaluated based on the first temperature sensor and the second temperature sensor. When the heat exchange state in the trapping area is abnormal, an alarm is given in time through the alarm device, reminding the operator to repair and adjust, thereby ensuring the reliable operation of the device of the present invention and ensuring the trapping efficiency of the trapping device.

[0047] The present invention solves the problems presented in the background technology: the existing dry trapping device for isophthalonitrile, such as the dry trap in the automatic discharging process of dry trapping of isophthalonitrile in 107513026B, has the following problems: there is a lack of a device for detecting the gas temperature in the trapping area inside the trap, and it is impossible to determine the heat exchange state inside the trapping chamber based on the detection results of the device for detecting the gas temperature in the trapping area, so it is impossible to timely detect the abnormal heat exchange state in the trapping area of the trap, thereby affecting the trapping efficiency of the trapping device. Brief Description of the Drawings

[0048] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0049] Figure 1 It is a schematic block diagram of the composition of the present invention;

[0050] Figure 2 It is a schematic structural diagram of a trapping chamber that can be adopted by the present invention;

[0051] Figure 3 It is a schematic structural diagram of another trapping chamber that can be adopted by the present invention.

[0052] In the figure: 1. Trapping chamber; 2. Mixed gas inlet; 3. Tail gas outlet; 4. Temperature regulating jacket; 5. Baffle plate. Specific embodiments

[0053] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not used to limit the present invention.

[0054] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes, and do not particularly refer to the meaning of order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions and technical features between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0055] The present invention provides the following embodiments:

[0056] Embodiment 1. The embodiment of the present invention provides a dry trapping device for isophthalonitrile, which includes a trapping chamber 1. The trapping chamber 1 is provided with a mixed gas inlet 2 (and also provided with a tail gas outlet 3).

[0057] The trapping chamber 1 is provided with a temperature regulating jacket 4. The temperature regulating jacket 4 is used to regulate the temperature of the inner wall of the trapping chamber 1. The temperature regulating jacket 4 is filled with a heat exchange medium. The temperature regulating jacket 4 is connected with a heat exchange medium inlet pipe. The heat exchange medium inlet pipe is connected to a heat exchange medium source. The heat exchange medium inlet pipe is connected with a first control valve. The interior of the trapping chamber 1 is divided into several trapping areas. The inner wall of the trapping chamber 1 in each trapping area is provided with a first temperature sensor. A sensor mounting bracket is provided in the intake area and the outlet area of each trapping area. A second temperature sensor is mounted on the sensor mounting bracket. The second temperature sensor is used to detect the air temperature at its location. The heat exchange medium outlet of the temperature regulating jacket 4 is also discharged through a discharge pipe to realize the recycling of the heat exchange medium.

[0058] The control device is electrically connected to the first temperature sensor, the second temperature sensor, the first control valve, and the alarm device respectively.

[0059] The inside of the trapping chamber 1 is at least divided into one trapping area. In the present invention, if the inside of the trapping chamber 1 is along the flowing direction of the mixed gas, multiple areas with a single flowing direction of the mixed gas can be divided (each area with a single flowing direction of the mixed gas is a trapping area), then the inside of the trapping chamber 1 can be divided into multiple trapping areas (such as Figure 3 it can be divided into three, such as Figure 2 it can be divided into one; Figure 3 in the upper and middle parts of the trapping chamber 1, it is divided into a left trapping sub-chamber and a right trapping sub-chamber by a vertical partition board. The lower part of the trapping chamber 1 is a connecting area connecting the left trapping sub-chamber and the right trapping sub-chamber. The left trapping sub-chamber is the trapping area 1, the right trapping sub-chamber is the trapping area 3, and the connecting area is the trapping area 2);

[0060] The phthalonitrile dry trapping device further includes: a setting module: used to set the set temperature of the trapping area. The setting module is electrically connected to the control device; in the present invention, the set temperature of the inner wall of each trapping area of the same trapping chamber 1 is the same; actually, by adjusting the first control valve, the actual temperature of the inner wall of the trapping area is within the preset range (which can be ±0.3°C) of the set temperature;

[0061] The alarm device includes: a first early warning module: used to give an early warning when the detected value of the second temperature sensor is not within the preset range of the set temperature of the inner wall of the trapping chamber 1.

[0062] Wherein, the heat exchange medium is steam with a pressure of 0.08 - 0.12 MPa; the present invention can also be provided with a vibration pad near the powder outlet of the trapping chamber 1. The vibration pad is a jet vibration pad, and the vibration frequency of the vibration pad is adjusted to 6 - 15 times / min;

[0063] The temperature of the inner wall of the trapping chamber 1 is 105 - 115°C, preferably 108 - 112°C.

[0064] The solid phthalonitrile outlet at the bottom of the trapping chamber 1 of the present invention can be provided with a spiral discharging device. Other structures provided in the trapping chamber 1 of the present invention can refer to the prior art, such as CN111282392A;

[0065] The embodiment of the present invention also discloses a phthalonitrile dry trapping method. The trapping method is carried out by using the phthalonitrile dry trapping device. The phthalonitrile dry trapping method includes:

[0066] Step S1: Introduce the heat exchange medium into the temperature regulating sleeve 4, and adjust the first control valve to make the temperature of the inner wall of the trapping chamber 1 reach the preset range of the set temperature of the trapping area;

[0067] Step S2: Start the spiral discharging device at the bottom of the trapping chamber 1;

[0068] Step S3: Introduce a mixed gas containing gaseous isophthalonitrile into the mixed gas inlet 2 for dry capture of isophthalonitrile; during the dry capture process, monitor and give early warnings on the heat exchange state of the isophthalonitrile dry capture device through an alarm device.

[0069] The beneficial effects of the above technical solution are as follows:

[0070] When the detected value of the second temperature sensor is not within the preset range of the set temperature on the inner wall of the capture chamber 1, an early warning is given through the first early warning module (this also indicates that the heat exchange state in the capture chamber 1 is abnormal at this time), reminding the operator to repair and adjust to ensure that the temperature of the inner wall of the capture chamber 1 meets the requirements, thereby ensuring the dry capture effect of isophthalonitrile.

[0071] The second temperature sensor is used to detect the air temperature in the capture area where it is located, and the first temperature sensor is used to detect the temperature of the inner wall of the capture chamber 1 in the capture area. The heat exchange state in the capture area can be evaluated based on the first temperature sensor and the second temperature sensor. When the heat exchange state in the capture area is abnormal, an alarm is given in time through the alarm device, reminding the operator to repair and adjust, so as to ensure the reliable operation of the device of the present invention and thus ensure the capture efficiency of the capture device.

[0072] The present invention solves the problems presented in the background technology: the existing dry capture device for isophthalonitrile, such as the dry capture device in a dry capture and automatic discharging process for isophthalonitrile with the patent number 107513026B, has the following problems: there is a lack of a device for detecting the gas temperature in the capture area of the capture device, and it is impossible to determine the heat exchange state in the capture chamber 1 based on the detection results of the device for detecting the gas temperature in the capture area, so it is impossible to timely detect the abnormal heat exchange state in the capture area of the capture device, thus affecting the capture efficiency of the capture device.

[0073] Embodiment 2, on the basis of Embodiment 1, further includes:

[0074] The dry capture device for isophthalonitrile further includes:

[0075] The first acquisition module: used to acquire: the heat transfer coefficient between the mixed gas containing gaseous isophthalonitrile and the inner wall of the capture area, and the density of the mixed gas containing gaseous isophthalonitrile;

[0076] A flow rate sensor, and a flow rate sensor is also installed on the sensor mounting bracket. The flow rate sensor is used to detect the gas flow rate at the location where it is located;

[0077] The first storage module: stores the detection values of the first temperature sensor, the second temperature sensor, and the flow rate sensor;

[0078] Evaluation and warning device. The evaluation and warning device operates once every first time interval (which can be set to a fixed value such as 30 minutes or dynamically adjusted). The evaluation and warning device includes;

[0079] The second acquisition module: used to acquire the detection values of the first temperature sensor, the second temperature sensor, and the flow rate sensor within the latest first historical duration (which can be 10 minutes; the first historical duration is the historical duration / historical period based on when the evaluation and warning device operates). For example, if the current operation time of the warning device is 9:00 on February 15, 2025, then the second acquisition module acquires the detection values of the first temperature sensor, the second temperature sensor, and the flow rate sensor between 8:50 on February 15, 2025, and 9:00 on February 15, 2025 during the current operation.

[0080] The first calculation module: used to calculate the actual temperature drop loss coefficient of the mixed gas containing gaseous isophthalonitrile in each trapping area of the current first historical duration based on the first acquisition module and the second acquisition module.

[0081] The first determination module: used to determine that the trapping area where the actual temperature drop loss coefficient of the mixed gas containing gaseous isophthalonitrile is greater than or equal to the preset temperature drop loss coefficient is an abnormal heat exchange trapping area.

[0082] The second warning module: used to issue a warning according to the numbers and quantities of the abnormal heat exchange trapping areas.

[0083] Preferably, the first calculation module calculates based on the following formula:

[0084]

[0085] P i1 is the actual temperature drop loss coefficient of the mixed gas containing gaseous isophthalonitrile in the i-th trapping area of the current first historical duration; T i1 is the average detection value of all the second temperature sensors in the intake area of the i-th trapping area of the current first historical duration; T i2 is the average detection value of all the second temperature sensors in the outlet area of the i-th trapping area of the current first historical duration; T i0 is the average detection value of all the first temperature sensors in the i-th trapping area of the current first historical duration; v i is the average detection value of all the flow rate sensors in the i-th trapping area of the current first historical duration; μ is the heat transfer coefficient between the mixed gas containing gaseous isophthalonitrile and the inner wall of the trapping area; ρ is the density of the mixed gas containing gaseous isophthalonitrile; K is the heat transfer efficiency between the mixed gas containing gaseous isophthalonitrile in the trapping area and the inner wall of the trapping area; S iis the cross-sectional area of the i-th trapping region; c is the average specific heat capacity of the mixed gas containing gaseous isophthalonitrile; S i1 is the average value of the inner wall area per unit length of the mixed gas in the i-th trapping region along the flow direction; α(v i ) is the total time for the mixed gas containing gaseous isophthalonitrile to pass through the i-th trapping region at v i .

[0086] The beneficial effects of the above technical solutions are as follows:

[0087] is determined based on the parameters of the mixed gas containing gaseous isophthalonitrile input into the trapping chamber and the relevant parameters of the i-th trapping region. When the temperature of the mixed gas containing gaseous isophthalonitrile entering the i-th trapping region is T i1 , and the temperature of the inner wall of the trapping chamber in the i-th trapping region (constant within a preset range of the set temperature) is T i0 , it is the predicted temperature of the mixed gas containing gaseous isophthalonitrile after heat exchange with the inner wall of the trapping chamber in the i-th trapping region and leaving the i-th trapping region; The present invention can also determine the predicted temperature of the mixed gas containing gaseous isophthalonitrile after heat exchange with the inner wall of the trapping chamber in the i-th trapping region and leaving the i-th trapping region based on other existing calculation functions or relevant mapping tables / mapping databases obtained through testing;

[0088] During the actual heat exchange process, due to reasons such as the accumulation of precipitated isophthalonitrile on the inner wall of the trapping chamber, the heat exchange area between the mixed gas containing gaseous isophthalonitrile and the inner wall of the trapping chamber may be reduced, resulting in abnormal heat exchange effects of the mixed gas containing gaseous isophthalonitrile in the trapping region.

[0089] Based on the detection values of the first temperature sensor, the second temperature sensor, and the flow rate sensor in the latest first historical period (a time period), the parameters of the current mixed gas containing gaseous isophthalonitrile, and the parameters of the trapping region itself, determine the actual temperature drop loss coefficient of the mixed gas containing gaseous isophthalonitrile in each trapping region during the latest first historical period (the ratio of the difference obtained by subtracting the actual temperature difference from the theoretical temperature difference before and after the mixed gas containing gaseous isophthalonitrile passes through the trapping region to the theoretical temperature difference before and after the mixed gas containing gaseous isophthalonitrile passes through the trapping region), and the calculation is reliable; and determine that the trapping region where the actual temperature drop loss coefficient of the mixed gas containing gaseous isophthalonitrile is greater than or equal to the preset temperature drop loss coefficient is a heat exchange abnormal trapping region, and issue a warning based on the numbers and quantities of the heat exchange abnormal trapping regions. The warning is reliable and can timely remind the operator to perform maintenance and adjustment, thus ensuring the reliable operation of the device of the present invention and ensuring the trapping efficiency of the trapping device.

[0090] Example 3. On the basis of Example 2, the evaluation and warning device further includes:

[0091] A second storage module: storing a target database;

[0092] A second calculation module: configured to calculate the phthalonitrile per unit time precipitation amount satisfaction coefficient of each trapping area of the current first historical duration based on the target database;

[0093] A third warning module: configured to give a warning when the phthalonitrile per unit time precipitation amount satisfaction coefficient of any trapping area of the current first historical duration is less than a preset per unit time precipitation amount satisfaction coefficient.

[0094] The second calculation module calculates based on the following formula:

[0095]

[0096] P i2 is the phthalonitrile per unit time precipitation amount satisfaction coefficient of the i-th trapping area of the current first historical duration; f(T i1 , v i , T i0 ) is combined with T i1 , v i , T i0 and the target database (the target database is a mapping database of the air temperature of the mixed gas of gaseous phthalonitrile (the air temperature of the trapping area) - the flow rate of the mixed gas (the flow rate of the mixed gas in the trapping area) - the inner wall temperature of the trapping area - the phthalonitrile per unit time precipitation amount test value; f(T i1 , v i , T i0 ) is the phthalonitrile per unit time precipitation amount test value corresponding to the air temperature of the mixed gas of gaseous phthalonitrile in the target database being T i1 , the flow rate of the mixed gas being v i , and the inner wall temperature of the trapping area being T i0 ; f(T i2 , v i , T i0 ) is the phthalonitrile per unit time precipitation amount test value obtained by combining T i2 , v i , T i0 and the target database; Q i is the required phthalonitrile per unit time precipitation amount of the i-th trapping area. τ1 and τ2 take values greater than 0 and less than 1, and the sum of τ1 and τ2 is 1, and can be respectively taken as 0.5; τ1 and τ2 are the first evaluation weight and the second evaluation weight respectively;

[0097] Among them, the target database can be obtained by testing based on the selected test capture area; the material of the test capture area is the same as that of the capture chamber wall material of the present invention.

[0098] The beneficial effects of the above technical solution are as follows: The average detection value of all the second temperature sensors in the intake area of the i-th capture area based on the current first historical duration, the average detection value of all the second temperature sensors in the outlet area of the i-th capture area based on the current first historical duration, and the average detection value of all the flow rate sensors in the i-th capture area based on the current first historical duration are used to estimate the actual per-unit-time precipitation amount of the i-th capture area in the current first historical duration (τ1f(T i1 , v i , T i0 ) + τ2f(T i2 , v i , T i0 )) and compare it with the required per-unit-time precipitation amount of isophthalonitrile in the i-th capture area, so as to determine whether the precipitation state of isophthalonitrile in the i-th capture area is normal. When the precipitation state of isophthalonitrile in the capture area is abnormal, the third warning module is used to give an alarm in time, so as to take targeted measures;

[0099] When the second warning module does not give an alarm, remind to adjust the set temperature of the capture area to adjust the heat exchange effect;

[0100] When the second warning module gives an alarm, remind to clean the capture area.

[0101] Example 4, on the basis of Example 3, the first acquisition module is further used to acquire: the required inner wall temperature range of the capture area corresponding to the mixed gas containing gaseous isophthalonitrile;

[0102] The isophthalonitrile dry capture device further includes: a temperature control module, and the temperature control module includes:

[0103] The first calculation unit: used to calculate the heat exchange efficiency of each capture area in the current first historical duration when the second warning module does not give an alarm and the third warning module gives an alarm;

[0104] The prediction unit: selects a number of target integer temperatures within the required inner wall temperature range of the capture area corresponding to the mixed gas containing gaseous isophthalonitrile; based on the first calculation unit, determines the predicted air temperature in the intake area and the predicted air temperature in the outlet area of each capture area at each target integer temperature; if the required inner wall temperature range of the capture area corresponding to the mixed gas containing gaseous isophthalonitrile is 105°C - 115°C, then the target integer temperatures are 105°C, 106°C, 107°C, 108°C, 109°C, 110°C, 111°C, 112°C, 113°C, 114°C, 115°C;

[0105] The first determination unit: configured to obtain the test value of the amount of phthalonitrile precipitated per unit time corresponding to the predicted air inlet temperature and the predicted air outlet temperature of the air inlet area of each trapping area based on the target database;

[0106] The second calculation unit: calculates the satisfaction coefficient of the comprehensive predicted amount of phthalonitrile precipitated per unit time at each target integer temperature based on the first determination unit;

[0107] The screening unit is configured to select the target integer temperature with the satisfaction coefficient of the comprehensive predicted amount of phthalonitrile precipitated per unit time greater than 1.2 as the adjusted target temperature (the target integer temperature with the maximum satisfaction coefficient of the comprehensive predicted amount of phthalonitrile precipitated per unit time can be selected as the adjusted target temperature);

[0108] During the process from the end of the current first historical period to the start of the next first historical period, the control device controls the actual set temperature of the setting module to be the adjusted target temperature.

[0109] The heat exchange efficiency of each trapping area for the current first historical period is calculated based on the following formula:

[0110]

[0111] Where, W i is the heat exchange efficiency of the i-th trapping area for the current first historical period; T i1 is the average detected value of all the second temperature sensors in the air inlet area of the i-th trapping area for the current first historical period; T i2 is the average detected value of all the second temperature sensors in the air outlet area of the i-th trapping area for the current first historical period; T i0 is the average detected value of all the first temperature sensors in the i-th trapping area for the current first historical period; v i is the average detected value of all the flow rate sensors in the i-th trapping area for the current first historical period; μ is the heat transfer coefficient between the mixed gas containing gaseous phthalonitrile and the inner wall of the trapping area; ρ is the density of the mixed gas containing gaseous phthalonitrile; S i is the cross-sectional area of the i-th trapping area (when the flue gas flow direction of the i-th trapping area is from top to bottom, this cross-sectional area is the horizontal cross-sectional area; for example, for a vertical circular ring-shaped trapping area with the flue gas flow direction in the remaining direction, the cross-sectional area is πR 2 , R is the inner diameter of the ring); c is the average specific heat capacity of the mixed gas containing gaseous phthalonitrile; S i1 is the average value of the inner wall area per unit length of the mixed gas in the i-th trapping area along the flow direction;

[0112] The predicted air outlet temperature of each trapping area at the target integer temperature;

[0113]

[0114] T ik1 is the predicted air temperature of the intake area of the i-th trapping area at the k-th target integer temperature (predicting the predicted air temperature of the intake area of the i-th trapping area after adjusting the inner wall temperature of the trapping area to the k-th target integer temperature at the end of the current first historical period); T ik2 is the predicted air temperature of the outlet area of the i-th trapping area at the k-th target integer temperature; T k is the k-th target integer temperature;

[0115] The predicted air temperature T of the intake area at each target integer temperature of the 1st trapping area along the flow direction of the mixed gas containing gaseous isophthalonitrile 11 (average detected value of all second temperature sensors in the intake area of the 1st trapping area in the current first historical period);

[0116] Among two adjacent trapping areas along the flow direction of the mixed gas, the air temperature value of the intake area of the latter trapping area is the predicted air temperature of the outlet area of the former trapping area; that is, T ik1 = T( i-1)k2 ; for the i-th trapping area along the flow direction of the mixed gas (such as Figure 3 in trapping area 2) before the (i - 1)-th trapping area (such as Figure 3 in trapping area 1);

[0117]

[0118]

[0119] E ik is the coefficient that the predicted phthalonitrile precipitation amount per unit time of the i-th trapping area satisfies at the k-th target integer temperature; T ik1 is the predicted air temperature of the intake area of the i-th trapping area at the k-th target integer temperature; T ik2 is the predicted air temperature of the outlet area of the i-th trapping area at the k-th target integer temperature; f(T ik1 , v i , T ik ) combined with T ik1 , v i , T ik and the target database to obtain the test value of the precipitation amount per unit time; f(T ik2 , v i , T ik ) combined with T ik2 , v i , Tik and the test value of the precipitation amount per unit time obtained from the target database; E k is the satisfaction coefficient of the comprehensive predicted phthalonitrile precipitation amount per unit time at the k-th target integer temperature.

[0120] The beneficial effects of the above technical solution are as follows:

[0121] When the second warning module does not give a warning and the third warning module gives a warning, it indicates that the heat exchange efficiency in the capture area is not abnormal (the precipitated phthalonitrile is not severely piled up), but the heat exchange effect cannot meet the requirements (the phthalonitrile precipitation amount per unit time cannot meet the production efficiency requirements). At this time, it is necessary to adjust the temperature of the inner wall of the capture chamber in the capture area to improve the heat exchange effect, so as to ensure the production efficiency requirements of the present invention;

[0122] Specifically: Based on the heat exchange efficiency prediction of the current first historical duration in the capture area, the predicted air inlet temperature and the predicted air outlet temperature of the air inlet area of each capture area are obtained, and then combined with the target database, the satisfaction coefficient of the comprehensive predicted phthalonitrile precipitation amount per unit time at each target integer temperature is calculated. The target integer temperature with a satisfaction coefficient of the comprehensive predicted phthalonitrile precipitation amount per unit time greater than 1.2 is selected as the adjusted target temperature, so as to ensure that the actual set temperature of the setting module is the adjusted target temperature and work at the adjusted target temperature, which can ensure the heat exchange effect requirements of the capture device (the phthalonitrile precipitation amount per unit time cannot meet the production efficiency requirements);

[0123] The target integer temperature with a satisfaction coefficient of the comprehensive predicted phthalonitrile precipitation amount per unit time greater than 1.2 is the adjusted target temperature, which on the one hand ensures the heat exchange effect requirements, and on the other hand avoids waste of energy caused by excessive temperature; and the present invention realizes automatic temperature adjustment, with high-efficiency and precise control.

[0124] Example 5, on the basis of any one of Examples 2 - 4, the evaluation and warning device further includes:

[0125] The third calculation module: used to calculate the heat exchange state fluctuation value and the heat exchange state value of each capture area in the current first historical duration;

[0126]

[0127] G i is the heat exchange state value of the i-th capture area in the current first historical duration; G i0 is the heat exchange state fluctuation value of the i-th capture area in the current first historical duration; M is the number of the current first historical duration; P iM is the actual temperature drop loss coefficient of the mixed gas containing gaseous phthalonitrile in the i-th capture area in the current first historical duration; P is0The actual temperature drop loss coefficient of the mixed gas containing gaseous isophthalonitrile in the i-th capture area for the first historical duration numbered s; P i ( S-1 )0 is the actual temperature drop loss coefficient of the mixed gas containing gaseous isophthalonitrile in the i-th capture area for the first historical duration numbered s - 1; P i0 is the preset temperature drop loss coefficient corresponding to the i-th capture area; the first historical duration numbered s is the next first historical duration after the first historical duration numbered s - 1;

[0128] The fourth calculation module: used to calculate the target time interval corresponding to the current first historical duration based on the heat exchange state fluctuation value and heat exchange state value of each capture area in the current first historical duration;

[0129]

[0130] H M is the target time interval corresponding to the current first historical duration; H M-1 is the target time interval corresponding to the previous first historical duration of the current first historical duration (the initial target time interval can be preset); max represents the maximum value; is calculated based on the heat exchange state fluctuation values and heat exchange state values of all capture areas the maximum value of (for example, if there are two capture areas in the capture chamber, is greater than then takes the value of ); e is the natural constant;

[0131] The third determination module is used to determine that after the evaluation and warning device works this time (selecting the relevant detection values of the current first historical duration for evaluation), the evaluation and warning device will work next time after the target time interval corresponding to the current first historical duration.

[0132] The beneficial effects of the above technical solutions are as follows: calculating the target time interval corresponding to the current first historical duration based on the heat exchange state fluctuation value and heat exchange state value of each capture area in the current first historical duration ensures that an appropriate time interval is selected to control the next work of the evaluation and warning device, ensuring the timely warning of the evaluation and warning device.

[0133] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A dry capture device for isophthalonitrile, comprising a capture chamber, wherein the capture chamber is provided with a mixed gas inlet, characterized in that: The capture chamber is provided with a temperature regulating sleeve, which is used to regulate the temperature of the inner wall of the capture chamber, the temperature regulating sleeve is filled with a heat exchange medium, the temperature regulating sleeve is connected to a heat exchange medium inlet pipe, the heat exchange medium inlet pipe is connected to a heat exchange medium source, the heat exchange medium inlet pipe is connected to a first control valve, the interior of the capture chamber is divided into a plurality of capture areas, the inner wall of the capture chamber of each capture area is provided with a first temperature sensor, the air inlet area and the air outlet area of ​​each capture area are provided with a sensor mounting frame, a second temperature sensor is installed on the sensor mounting frame, and the second temperature sensor is used to detect the air temperature at the location thereof; The control device is electrically connected to the first temperature sensor, the second temperature sensor, the first control valve and the alarm device respectively.

2. The isophthalonitrile dry capture device according to claim 1, characterized in that: Also includes: Setting module: used to set the setting temperature of the capture area, the setting module is electrically connected to the control device; The alarm device comprises: a first early warning module: used for issuing an early warning when the detection value of the second temperature sensor is not within a preset range of the set temperature of the inner wall of the collection chamber.

3. The isophthalonitrile dry capture device according to claim 2, characterized in that: Also includes: The first acquisition module is used to acquire: the heat exchange coefficient between the mixed gas containing gaseous isophthalonitrile and the inner wall of the capture area, and the density of the mixed gas containing gaseous isophthalonitrile; A flow velocity sensor is also installed on the sensor mounting frame, and the flow velocity sensor is used to detect the gas flow velocity at the location where the flow velocity sensor is located; First storage module: storing detection values ​​of the first temperature sensor, the second temperature sensor, and the flow rate sensor; The alarm device further includes: an evaluation and early warning device, the evaluation and early warning device operates once every first time interval, and the evaluation and early warning device includes; The second acquisition module is used to obtain the detection values ​​of the first temperature sensor, the second temperature sensor, and the flow rate sensor within the latest first historical time period; A first calculation module: used for calculating the actual temperature drop loss coefficient of the mixed gas containing gaseous isophthalonitrile in each capture area of ​​the current first historical time length based on the first acquisition module and the second acquisition module; The first determination module is used to determine that the capture area where the actual temperature drop loss coefficient of the mixed gas containing gaseous isophthalonitrile is greater than or equal to the preset temperature drop loss coefficient is the heat exchange abnormal capture area; The second warning module is used to issue warnings based on the number and quantity of heat exchange abnormality capture areas.

4. The isophthalonitrile dry capture device according to claim 3, characterized in that: The first calculation module is based on the following calculation formula: P i1 is the actual temperature drop loss coefficient of the mixed gas containing gaseous isophthalonitrile in the i-th capture area of ​​the current first historical time length; T i1 is the average detection value of all second temperature sensors in the intake area of ​​the i-th trapping area of ​​the current first historical time length; T i2 is the average detection value of all second temperature sensors in the outlet area of ​​the i-th capture area of ​​the current first historical time length; T i0 is the average detection value of all first temperature sensors in the i-th capture area of ​​the current first historical duration; v i is the average detection value of all flow rate sensors in the i-th capture area in the current first historical time length; μ is the heat transfer coefficient between the mixed gas containing gaseous isophthalonitrile and the inner wall of the capture area; ρ is the density of the mixed gas containing gaseous isophthalonitrile; K is the heat transfer efficiency between the mixed gas containing gaseous isophthalonitrile in the capture area and the inner wall of the capture area; S i is the cross-sectional area of ​​the i-th capture region; c is the average specific heat capacity of the mixed gas containing gaseous isophthalonitrile; S i1 is the average value of the inner wall area per unit length of the mixed gas in the i-th capture area along the flow direction; α(v i ) is a mixed gas containing gaseous isophthalonitrile in v i The total time to pass through the i-th capture area.

5. The isophthalonitrile dry capture device according to claim 3, characterized in that: The evaluation and early warning device also includes: The second storage module is used to store a target database, which is a mapping database of the temperature of the mixed gas containing gaseous isophthalonitrile - the flow rate of the mixed gas - the inner wall temperature of the capture area - the precipitation amount of isophthalonitrile per unit time test value; The second calculation module is used to calculate the isophthalonitrile precipitation amount per unit time satisfaction coefficient of each capture area of ​​the current first historical time length based on the target database; The third warning module is used to issue a warning when the isophthalonitrile precipitation amount per unit time satisfaction coefficient of any capture area in the current first historical time period is less than the preset precipitation amount per unit time satisfaction coefficient.

6. The isophthalonitrile dry capture device according to claim 3, characterized in that: The evaluation and early warning device also includes: The third calculation module is used to calculate the heat exchange state fluctuation value and the heat exchange state value of each capture area in the current first historical time length; A fourth calculation module: used to calculate the target time interval corresponding to the current first historical duration based on the heat exchange state fluctuation value and the heat exchange state value of each capture area of ​​the current first historical duration; The third determination module is used to determine that the evaluation and early warning device will perform the next operation after the target time interval corresponding to the current first historical duration after the current operation.

7. The isophthalonitrile dry capture device according to claim 5, characterized in that: The first acquisition module is also used to obtain: the inner wall temperature range of the required capture area corresponding to the mixed gas containing gaseous isophthalonitrile; The isophthalonitrile dry capture device also includes: a temperature control module, and the temperature control module includes: The first calculation unit is used for calculating the heat exchange efficiency of each capture area for the current first historical time length when the second warning module does not give an early warning but the third warning module gives an early warning; Prediction unit: selects a plurality of target integer temperatures within the inner wall temperature range of the required capture area corresponding to the mixed gas containing gaseous isophthalonitrile; determines the predicted air temperature of the inlet area and the predicted air temperature of the outlet area of ​​each capture area at each target integer temperature based on the first calculation unit; A first determination unit: used for obtaining a unit time precipitation amount test value corresponding to a predicted air temperature of an inlet area and a predicted air temperature of an outlet area of ​​each capture area based on a target database; A second calculation unit: based on the first determination unit, calculates a coefficient satisfying the comprehensive prediction of the precipitation amount of isophthalonitrile per unit time for each target integer temperature; A screening unit is used to select a target integer temperature whose coefficient of the comprehensive prediction of the precipitation amount of isophthalonitrile per unit time is greater than 1.2 as the adjusted target temperature; During the process from the end of the current first historical duration to the beginning of the next first historical duration, the control device controls the actual setting temperature of the setting module to be the adjusted target temperature.

8. The isophthalonitrile dry capture device according to claim 7, characterized in that: The second calculation unit is calculated based on the following formula: E ik is the coefficient of the predicted precipitation amount of isophthalonitrile per unit time in the i-th capture area at the k-th target integer temperature; T ik1 is the predicted air temperature of the inlet area of ​​the ith capture area at the kth target integer temperature; T ik2 is the predicted air temperature of the outlet area of ​​the i-th capture area at the k-th target integer temperature; f(T ik1 , v i , T ik ) Combined with T ik1 , v i , T ik And the test value of precipitation per unit time obtained from the target database; f(T ik2 , v i , T ik ) Combined with T ik2 , v i , T ik And the test value of precipitation per unit time obtained from the target database; Q i is the required precipitation amount of isophthalonitrile per unit time in the i-th capture area.

9. A dry capture method for isophthalonitrile, characterized in that: The capture method is performed using an isophthalonitrile dry capture device as described in any one of claims 1 to 8, and the isophthalonitrile dry capture method comprises: Step S1: introducing a heat exchange medium into the temperature regulating sleeve, and adjusting the first control valve so that the temperature of the inner wall of the capture chamber is within a preset range of the set temperature of the capture area; Step S2: starting the spiral discharging device at the bottom of the collection chamber; Step S3: introducing a mixed gas containing gaseous isophthalonitrile into the mixed gas inlet to perform dry capture of isophthalonitrile; during the dry capture process, the heat exchange state of the isophthalonitrile dry capture device is monitored and warned by an alarm device.

Images