Reaction kettle temperature control method and device and computer equipment

Abstract

The invention relates to the technical field of chemical engineering, in particular to a reaction kettle temperature control method and device and computer device.The reaction kettle temperature control method comprises the steps that the total heat transfer coefficient of a reaction kettle, the heat exchange area of the reaction kettle and the specific heat capacity of cooling water are obtained; calculating a first flow set value of cooling water according to the total heat transfer coefficient, the heat exchange area and the specific heat capacity; obtaining a first flow actual value of cooling water; and when the flow of the cooling water is increased and the temperature of the reaction kettle cannot be reduced, obtaining the theoretical opening degree of the to-be-quenched liquid feeding valve according to the first flow set value and the first flow actual value. Therefore, when the heat transfer efficiency of the cooling water reaches the limit, the feeding amount of the to-be-quenched liquid can be adjusted according to the first flow set value and the first flow actual value, so that the temperature of the reaction kettle can be controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical engineering, and particularly relates to a method and device for controlling the temperature of a reaction kettle and a computer device. Background Art

[0002] In the quenching reaction unit of a synthetic auxiliary project, the alkyl aluminum liquid to be quenched from the upstream buffer tank of the liquid to be quenched is dropped into the quenching reaction kettle for quenching reaction. To ensure complete quenching, a certain amount of demineralized water is pre-laid at the bottom of the quenching reaction kettle. A stirrer is installed in the reaction kettle, and a cooling water jacket is used for heat removal. The regulating valve on the cooling water return pipeline is adjusted to maintain a constant reaction temperature by controlling the temperature of the reaction kettle.

[0003] However, according to the operation feedback, due to the small buffering capacity of the upstream buffer tank of the liquid to be quenched and the complex working conditions of alkyl aluminum quenching, the concentration of alkyl aluminum entering the quenching reaction kettle often changes. When the concentration of alkyl aluminum increases, the temperature control effect deteriorates. That is, although the cooling water flow rate continuously increases, the temperature of the reaction kettle continues to rise. The high-temperature shutdown large interlock has been triggered twice, which not only affects the continuous and stable production but also poses a great potential safety hazard. Summary of the Invention

[0004] In view of this, the present invention provides a method and device for controlling the temperature of a reaction kettle and a computer device to solve the problem that the temperature of the reaction kettle cannot be reduced when the cooling water flow rate increases in the quenching reaction unit of a synthetic auxiliary project.

[0005] In a first aspect, the present invention provides a method for controlling the temperature of a reaction kettle, including the following steps: obtaining the overall heat transfer coefficient of the reaction kettle, the heat transfer area of the reaction kettle, and the specific heat capacity of the cooling water; calculating a first flow rate set value of the cooling water according to the overall heat transfer coefficient, the heat transfer area, and the specific heat capacity; obtaining an actual first flow rate value of the cooling water; when the temperature of the reaction kettle cannot be reduced when the flow rate of the cooling water increases, obtaining the theoretical opening degree of the valve for feeding the liquid to be quenched according to the first flow rate set value and the actual first flow rate value.

[0006] The method for controlling the temperature of the reaction kettle provided by the present invention calculates the first flow rate set value of the cooling water according to the overall heat transfer coefficient, the heat transfer area, and the specific heat capacity. When the heat transfer efficiency of the cooling water reaches the limit, the feeding amount of the liquid to be quenched is adjusted according to the first flow rate set value and the actual first flow rate value, so that the temperature of the reaction kettle can be controlled.

[0007] In an optional embodiment, the method for controlling the temperature of the reaction kettle further includes the following steps: when the temperature of the reaction kettle can be reduced when the flow rate of the cooling water increases, respectively obtaining a second flow rate set value and an actual second flow rate value of the liquid to be quenched; obtaining the theoretical opening degree of the valve for feeding the liquid to be quenched according to the second flow rate set value and the actual second flow rate value.

[0008] This is because before the heat transfer efficiency of the cooling water reaches the limit, it is also necessary to adjust the feed rate of the liquid to be quenched. At this time, the theoretical opening of the feed valve of the liquid to be quenched can be adjusted according to the second flow rate set value and the actual second flow rate of the liquid to be quenched, so as to adjust the feed rate of the liquid to be quenched.

[0009] In an alternative embodiment, before obtaining the valve opening of the feed valve of the liquid to be quenched according to the first flow rate set value and the actual first flow rate, the following steps are further included: determining whether the actual first flow rate is greater than or equal to the first flow rate set value; when the actual first flow rate is greater than or equal to the first flow rate set value, it is determined that the temperature of the reaction kettle cannot be reduced due to the increase in the flow rate of the cooling water.

[0010] That is to say, it is possible to determine whether the heat transfer efficiency of the cooling water has reached the limit according to the comparison result between the actual first flow rate and the first flow rate set value. Specifically, when the actual first flow rate is greater than or equal to the first flow rate set value, it is considered that the heat transfer efficiency of the cooling water has reached the limit. At this time, it is necessary to adjust the feed rate of the liquid to be quenched according to the first flow rate set value and the actual first flow rate, so as to control the temperature of the reaction kettle. When the actual first flow rate is less than the first flow rate set value, it is considered that the heat transfer efficiency of the cooling water has not reached the limit. At this time, the theoretical opening of the cooling water inlet valve can still be obtained according to the first flow rate set value and the actual first flow rate, so as to control the temperature of the reaction kettle.

[0011] In an alternative embodiment, before obtaining the valve opening of the feed valve of the liquid to be quenched according to the first flow rate set value and the actual first flow rate, the following steps are further included: obtaining the first opening of the feed valve of the liquid to be quenched according to the first flow rate set value and the actual first flow rate; obtaining the second opening of the feed valve of the liquid to be quenched according to the second flow rate set value and the actual second flow rate; when the first opening is less than or equal to the second opening, it is determined that the temperature of the reaction kettle cannot be reduced due to the increase in the flow rate of the cooling water.

[0012] That is to say, it is possible to determine whether the heat transfer efficiency of the cooling water has reached the limit according to the comparison result between the first opening and the second opening. Specifically, when the first opening is less than or equal to the second opening, it is considered that the heat transfer efficiency of the cooling water has reached the limit. At this time, it is necessary to adjust the feed rate of the liquid to be quenched according to the second opening, so as to control the temperature of the reaction kettle. When the first opening is greater than the second opening, it is considered that the heat transfer efficiency of the cooling water has not reached the limit. At this time, the feed rate of the liquid to be quenched can be controlled through the second opening.

[0013] In an alternative embodiment, calculating the first flow rate set value of the cooling water according to the overall heat transfer coefficient, heat transfer area and specific heat capacity includes: calculating the first flow rate set value of the cooling water using a preset formula according to the overall heat transfer coefficient, heat transfer area and specific heat capacity; the preset formula is Where W0 represents the first flow rate set value of the cooling water, K represents the overall heat transfer coefficient, S represents the heat exchange area, and Cp represents the specific heat capacity of the cooling water.

[0014] Thus, an accurate first flow rate set value can be obtained.

[0015] In an alternative embodiment, the reactor temperature control method further includes the following steps: obtaining the theoretical opening degree of the cooling water inlet valve according to the first flow rate set value and the actual first flow rate.

[0016] Thus, the temperature of the reactor can be controlled by the cooling water.

[0017] In a second aspect, the present invention further provides a reactor temperature control device, which includes a first acquisition module, a flow rate set value determination module, a second acquisition module, and a feed valve opening degree determination module; wherein the first acquisition module is used to acquire the overall heat transfer coefficient of the reactor, the heat exchange area of the reactor, and the specific heat capacity of the cooling water; the flow rate set value determination module is used to calculate the first flow rate set value of the cooling water according to the overall heat transfer coefficient, the heat exchange area, and the specific heat capacity; the second acquisition module is used to acquire the actual first flow rate of the cooling water; the feed valve opening degree determination module is used to obtain the theoretical opening degree of the quenching liquid feed valve according to the first flow rate set value and the actual first flow rate when the temperature of the reactor cannot be reduced as the flow rate of the cooling water increases.

[0018] In a third aspect, the present invention further provides a computer device, which includes a memory and a processor, and the memory and the processor are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to execute the reactor temperature control method according to the first aspect or any corresponding embodiment thereof.

[0019] In a fourth aspect, the present invention further provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions are used to cause a computer to execute the reactor temperature control method according to the first aspect or any corresponding embodiment thereof.

[0020] In a fifth aspect, the present invention further provides a computer program product, which includes computer instructions, and the computer instructions are used to cause a computer to execute the reactor temperature control method according to the first aspect or any corresponding embodiment thereof. Description of the Drawings

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 is a control strategy flowchart of a quenching reaction kettle for a synthetic auxiliary project in the related art;

[0023] Figure 2 is a schematic diagram of the relationship between cooling efficiency and cooling water flow rate;

[0024] Figure 3 is a flowchart of a reaction kettle temperature control method according to an embodiment of the present invention;

[0025] Figure 4 is a flowchart of another reaction kettle temperature control method according to an embodiment of the present invention;

[0026] Figure 5 is a flowchart of yet another reaction kettle temperature control method according to an embodiment of the present invention;

[0027] Figure 6 is a schematic diagram of a reaction kettle control system according to an embodiment of the present invention;

[0028] Figure 7 is a structural block diagram of a reaction kettle temperature control device according to an embodiment of the present invention;

[0029] Figure 8 is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention;

[0030] Among them, 1. Quenching reaction kettle; 2. Stirring rod; 3. Cooling water jacket. Detailed implementation manners

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Figure 1 is a control strategy flowchart of a quenching reaction kettle for a synthetic auxiliary project in the related art, as Figure 1As shown in the figure, the alkyl aluminum liquid to be quenched from the upstream liquid buffer tank to be quenched is added dropwise to the quenching reactor 1 for quenching reaction. To ensure complete quenching, a certain amount of demineralized water is used to line the bottom of the quenching reactor 1 in advance. A stirring rod 2 is provided in the quenching reactor 1, and a cooling water jacket 3 is used for heat removal. A reactor temperature controller TC is provided in the reactor control system. The reactor temperature controller TC obtains the theoretical opening of the cooling water inlet valve according to the set value of the cooling water flow rate and the actual value of the cooling water flow rate, and controls the regulating valve FV2 on the cooling water return pipeline according to the theoretical opening of the cooling water inlet valve to keep the quenching reactor at a constant reaction temperature.

[0033] As Figure 1 shown in the figure, a regulating valve FV1 for the liquid to be quenched is provided between the buffer tank for the liquid to be quenched and the quenching reactor 1. The controller FCL for the liquid to be quenched is connected to FV1, and the flow rate of the liquid to be quenched entering the quenching reactor 1 is adjusted through FCL and FV1. A demineralized water regulating valve XV1 is provided between the demineralized water tank and the quenching reactor 1. The demineralized water controller FQ is connected to XV1, and the total amount of demineralized water entering the quenching reactor 1 is adjusted through FQ and CV1. According to the operation feedback, due to the small buffering capacity of the upstream buffer tank for the liquid to be quenched and the complex working conditions of alkyl aluminum quenching, the concentration of alkyl aluminum entering the quenching reactor 1 often changes. When the concentration of alkyl aluminum increases, the temperature control effect becomes worse, manifested as the temperature of the quenching reactor 1 continues to rise although the cooling water flow rate is constantly increasing. The high-temperature shutdown large interlock has been triggered twice, affecting the continuous and stable production and posing a great safety hazard at the same time.

[0034] In order to find out the real reason why the temperature cannot be reduced when the cooling water flow rate increases, the following series of theoretical derivations and mathematical calculations were carried out.

[0035] For a given reactor, its heat removal is basically a two-step process:

[0036] 1) First, transfer the heat released by the material reaction from the material side to the cooling water. The mechanism can be described by the heat transfer equation:

[0037] Q = K * S * ΔT m …… Formula 1

[0038] In Formula 1, Q represents the heat transfer power, W; K represents the total heat transfer coefficient, W / (m 2 ·°C); S represents the heat transfer area, m 2 ; ΔT m represents the logarithmic mean heat transfer temperature difference, °C.

[0039] According to the definition of the logarithmic mean heat transfer temperature difference:

[0040]

[0041] In Formula 2, T represents the temperature of the reactor, in °C; t1 represents the inlet temperature of the cooling water, in °C; t2 represents the outlet temperature of the cooling water, in °C.

[0042] 2) The cooling water takes away heat from the jacket in the form of sensible heat. The heat transfer equation on the cooling water side is:

[0043] Q = W * C p *(t2 - t1) …… Formula 3

[0044] In Formula 3, Q represents the heat transfer power of the cooling water, in W; W represents the flow rate of the cooling water, in kg / s; C p represents the specific heat capacity of the cooling water, in J / (kg·°C).

[0045] Under the condition of heat transfer steady state, the heat transfer power of the exothermic reaction of the material transferred to the cooling water and the heat taken away by the cooling water from the jacket in the form of sensible heat must be equal, that is, Formula 1 above is equal to Formula 3. After simplification, we can get:

[0046]

[0047] When the flow rate of the cooling water is very large but the heat transfer is limited, the right side of the equal sign in Formula 4 tends to 0. Obviously, the outlet temperature t2 of the cooling water will be infinitely close to the inlet temperature t1 of the cooling water. At this time, the heat transfer temperature difference between the reactor and the cooling water is T - t1. Therefore, the maximum heat transfer power under the heat transfer limit condition:

[0048] Q max = K * S * (T - t1) …… Formula 5

[0049] Combining Formula 1, Formula 2 and Formula 5, and defining the parameter β as the heat transfer efficiency of the cooling water for heat removal, we have:

[0050]

[0051] Combining Formula 4 and Formula 6, we can get:

[0052]

[0053] Let a = K * S / C p , and there is the following relationship between the heat transfer efficiency β and the flow rate W of the cooling water:

[0054]

[0055] For a given reactor, the heat transfer area S and the specific heat capacity C of the cooling water pThey are all fixed values. Generally speaking, the viscosity of the materials in the reactor is relatively high, and the fouling thermal resistance coefficient is also high, resulting in the heat transfer coefficient on the inner side of the reactor being much lower than that in the jacket. Although increasing the flow rate of the cooling water improves the heat transfer coefficient in the jacket, its impact on the overall heat transfer coefficient K is very limited. Here, we can assume that the overall heat transfer coefficient K is a fixed value and does not change with the flow rate of the cooling water.

[0056] As Figure 2 shown, after calculating the value of a, the relationship curve between the heat transfer efficiency β and the cooling water flow rate W can be plotted using Excel software. It can be seen from the figure that when the heat transfer efficiency β is greater than 0.9, even if the cooling water flow rate increases rapidly, the improvement in the heat transfer power is very limited. Of course, this reasonably explains the phenomenon found in production that the reaction temperature continues to rise even though the cooling water flow rate has increased significantly.

[0057] Based on this, it is necessary to discover the working conditions where the heat transfer efficiency is greater than 0.9 through some measurable parameters and adopt appropriate control strategies to adjust in a timely manner to avoid the continuous soar of the reactor temperature.

[0058] After simplification according to Equation 8, let t = a / W. When the heat transfer efficiency β is equal to 0.9, we have:

[0059]

[0060] Using Matlab software to solve, we get t = 0.2146. Therefore, when W = a / 0.2146, it is the cooling water flow rate corresponding to the heat transfer efficiency β equal to 0.9. Therefore, we can judge that the heat transfer in the reactor jacket has reached the limit by monitoring whether the cooling water flow rate reaches the calculated value of the following formula:

[0061]

[0062] In Equation 10, W0 represents the cooling water flow rate corresponding to the heat transfer efficiency of 0.9, kg / s; K represents the overall heat transfer coefficient, W / (m 2 ·℃); S represents the heat transfer area, m 2 ; C p represents the specific heat capacity of the cooling water, J / (kg·℃).

[0063] After the heat transfer efficiency of the cooling water reaches the limit, it is no longer meaningful to further adjust the cooling water flow rate to control the reactor temperature. It is necessary to control the reaction temperature by restricting the feed rate of the reactants. Therefore, it is considered to add an override control module after the feed flow controller of the reactor. When heat transfer limitation is detected, the cooling water flow rate is used to override control the reaction feed.

[0064] Through the above research, an embodiment of the present invention provides an embodiment of a method for controlling the temperature of a reaction kettle. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0065] In this embodiment, a method for controlling the temperature of a reaction kettle is provided, which can be used in computer equipment. Figure 3 It is a flowchart of the method for controlling the temperature of a reaction kettle according to an embodiment of the present invention, as Figure 3 shown, the process includes the following steps:

[0066] Step S301: Obtain the overall heat transfer coefficient of the reaction kettle, the heat transfer area of the reaction kettle, and the specific heat capacity of the cooling water.

[0067] Step S302: Calculate the first flow rate set value of the cooling water according to the overall heat transfer coefficient, the heat transfer area, and the specific heat capacity.

[0068] In the quenching reaction kettle of the synthesis aid project, the first flow rate set value of the cooling water is the cooling water flow rate corresponding to a heat transfer efficiency of 0.9. Specifically, the first flow rate set value of the cooling water can be calculated according to the above formula 10.

[0069] It should be noted that in addition to being applied to the quenching reaction kettle of the synthesis aid project, this embodiment can also be applied to other reaction kettles. When applied to other reaction kettles, the method for calculating the first flow rate set value of the cooling water according to the overall heat transfer coefficient, the heat transfer area, and the specific heat capacity can be obtained according to the above analysis of the quenching reaction kettle of the synthesis aid project.

[0070] Step S303: Obtain the actual value of the first flow rate of the cooling water.

[0071] Specifically, the actual value of the first flow rate of the cooling water can be obtained through a flow meter.

[0072] Step S304: When the temperature of the reaction kettle cannot be reduced when the flow rate of the cooling water increases, obtain the theoretical opening degree of the feed valve of the liquid to be quenched according to the first flow rate set value and the actual value of the first flow rate.

[0073] That is to say, when the heat transfer efficiency of the cooling water reaches the limit, further adjusting the flow rate of the cooling water has little significance for controlling the temperature of the reaction kettle. The feed amount of the liquid to be quenched can be adjusted according to the first flow rate set value and the actual value of the first flow rate, so as to control the temperature of the reaction kettle.

[0074] The reactor temperature control method provided in this embodiment calculates the first flow rate set value of the cooling water based on the overall heat transfer coefficient, heat transfer area, and specific heat capacity. When the heat transfer efficiency of the cooling water reaches its limit, the feed rate of the liquid to be quenched is adjusted according to the first flow rate set value and the actual first flow rate, thereby enabling the control of the reactor temperature.

[0075] In this embodiment, a reactor temperature control method is provided, which can be used in computer equipment. Figure 4 It is a flowchart of another reactor temperature control method according to an embodiment of the present invention, as Figure 4 shown, and this process includes the following steps:

[0076] Step S401: Obtain the overall heat transfer coefficient of the reactor, the heat transfer area of the reactor, and the specific heat capacity of the cooling water.

[0077] Step S402: Calculate the first flow rate set value of the cooling water based on the overall heat transfer coefficient, heat transfer area, and specific heat capacity.

[0078] As above, in the quenching reactor of the synthetic auxiliary project, the first flow rate set value of the cooling water is the cooling water flow rate corresponding to a heat transfer efficiency of 0.9. Specifically, the first flow rate set value of the cooling water can be calculated according to the above formula 10.

[0079] Step S403: Obtain the actual first flow rate of the cooling water.

[0080] Step S404: Determine whether the actual first flow rate is greater than or equal to the first flow rate set value; when the actual first flow rate is greater than or equal to the first flow rate set value, it is determined that the temperature of the reactor cannot be reduced due to the increase in the flow rate of the cooling water, and the process proceeds to step S405; otherwise, the process proceeds to step S406.

[0081] Step S405: Obtain the theoretical opening degree of the feed valve of the liquid to be quenched based on the first flow rate set value and the actual first flow rate.

[0082] Step S406: Obtain the second flow rate set value and the actual second flow rate of the liquid to be quenched respectively.

[0083] Step S407: Obtain the theoretical opening degree of the feed valve of the liquid to be quenched based on the second flow rate set value and the actual second flow rate.

[0084] That is, it is possible to determine whether the heat transfer efficiency of the cooling water has reached the limit according to the comparison result between the actual value of the first flow rate and the set value of the first flow rate. Specifically, when the actual value of the first flow rate is greater than or equal to the set value of the first flow rate, it is considered that the heat transfer efficiency of the cooling water has reached the limit. At this time, it is necessary to adjust the feed rate of the liquid to be quenched according to the set value of the first flow rate and the actual value of the first flow rate, so as to control the temperature of the reaction kettle. When the actual value of the first flow rate is less than the set value of the first flow rate, it is considered that the heat transfer efficiency of the cooling water has not reached the limit. Before the heat transfer efficiency of the cooling water has not reached the limit, it is also necessary to adjust the feed rate of the liquid to be quenched. At this time, the feed rate of the liquid to be quenched can be adjusted according to the Figure 1 method, that is, the theoretical opening of the feed valve of the liquid to be quenched is adjusted according to the set value of the second flow rate and the actual value of the second flow rate of the liquid to be quenched, so as to adjust the feed rate of the liquid to be quenched.

[0085] In addition, it should be noted that the above steps of this embodiment only give the adjustment scheme of the feed rate of the liquid to be quenched. During the reaction of the reaction kettle, it is necessary to use cooling water to cool down the reaction kettle. Specifically, the water intake of the cooling water can be controlled by the following method: the theoretical opening of the cooling water inlet valve is obtained according to the set value of the first flow rate and the actual value of the first flow rate.

[0086] This embodiment provides a method for controlling the temperature of a reaction kettle. The comparison result between the actual value of the first flow rate and the set value of the first flow rate determines whether the heat transfer efficiency of the cooling water has reached the limit. When the heat transfer efficiency of the cooling water has reached the limit, it is necessary to adjust the feed rate of the liquid to be quenched according to the set value of the first flow rate and the actual value of the first flow rate, so as to control the temperature of the reaction kettle; when the heat transfer efficiency of the cooling water has not reached the limit, the theoretical opening of the feed valve of the liquid to be quenched is obtained according to the set value of the second flow rate and the actual value of the second flow rate of the liquid to be quenched; and during the reaction of the reaction kettle, the theoretical opening of the cooling water inlet valve is obtained according to the set value of the first flow rate and the actual value of the first flow rate, so that the reaction kettle can be cooled down by using the cooling water.

[0087] In this embodiment, a method for controlling the temperature of a reaction kettle is provided, which can be used in a computer device. Figure 5 is a flowchart of another method for controlling the temperature of a reaction kettle according to an embodiment of the present invention, as Figure 5 shown, the process includes the following steps:

[0088] Step S501: Obtain the overall heat transfer coefficient of the reaction kettle, the heat transfer area of the reaction kettle, and the specific heat capacity of the cooling water.

[0089] Step S502: Calculate the set value of the first flow rate of the cooling water according to the overall heat transfer coefficient, the heat transfer area, and the specific heat capacity.

[0090] As described above, in the quenching reaction kettle of the synthesis aid project, the first flow rate set value of the cooling water is the cooling water flow rate corresponding to a heat transfer efficiency of 0.9. Specifically, the first flow rate set value of the cooling water can be calculated according to the above formula 10.

[0091] Step S503: Obtain the actual value of the first flow rate of the cooling water.

[0092] Step S504: Obtain the first opening degree of the feed valve of the liquid to be quenched according to the first flow rate set value and the actual value of the first flow rate.

[0093] Step S505: Respectively obtain the second flow rate set value and the actual value of the second flow rate of the liquid to be quenched.

[0094] Step S506: Obtain the second opening degree of the feed valve of the liquid to be quenched according to the second flow rate set value and the actual value of the second flow rate.

[0095] Step S507: Determine whether the first opening degree is less than or equal to the second opening degree. When the first opening degree is less than or equal to the second opening degree, it is determined that the temperature of the reaction kettle cannot be reduced by increasing the flow rate of the cooling water, and go to step S508; otherwise, go to step S509.

[0096] Step S508: Take the first opening degree as the theoretical opening degree of the feed valve of the liquid to be quenched.

[0097] Step S509: Take the second opening degree as the theoretical opening degree of the feed valve of the liquid to be quenched.

[0098] That is to say, it is possible to determine whether the heat transfer efficiency of the cooling water has reached the limit according to the comparison result of the first opening degree and the second opening degree. Specifically, when the first opening degree is less than or equal to the second opening degree, it is considered that the heat transfer efficiency of the cooling water has reached the limit. At this time, it is necessary to adjust the feed amount of the liquid to be quenched according to the second opening degree, so as to control the temperature of the reaction kettle. When the first opening degree is greater than the second opening degree, it is considered that the heat transfer efficiency of the cooling water has not reached the limit. At this time, the feed amount of the liquid to be quenched can be controlled through the second opening degree.

[0099] As described above, the above steps of this embodiment only give the adjustment scheme of the feed amount of the liquid to be quenched. During the reaction of the reaction kettle, it is necessary to use cooling water to cool down the reaction kettle. Specifically, the water inflow of the cooling water can be controlled by the following method: obtain the theoretical opening degree of the cooling water inlet valve according to the first flow rate set value and the actual value of the first flow rate.

[0100] For example, a reaction kettle temperature controller TC is provided in the reaction kettle control system. The reaction kettle temperature controller TC obtains the theoretical opening degree of the cooling water inlet valve according to the first flow rate set value and the actual value of the first flow rate, and controls the regulating valve FV2 on the cooling water return pipeline according to the theoretical opening degree of the cooling water inlet valve to maintain a constant reaction temperature.

[0101] As shown Figure 6 in the figure, in the reactor control system, a cooling water flow controller FC2 is provided. The total heat transfer coefficient K, heat transfer area S of the reactor and specific heat capacity C of the cooling water are manually input through the DCS screen p parameters. Formula 10 is set in the calculation block Y in FC2. The cooling water flow value corresponding to the heat transfer limit is calculated using Formula 10 and used as the set value of FC2 (i.e., the first flow set value). A flowmeter is added to the cooling water outlet pipeline to detect the cooling water flow in real time and used as the measured value of FC2 (i.e., the first flow actual value). FC2 obtains the first opening of the feed valve for the liquid to be quenched based on the first flow set value and the first flow actual value. The first opening is the output value of FC2

[0102] In the reactor control system, a controller FC1 for the liquid to be quenched is also provided. FC1 obtains the second opening of the feed valve for the liquid to be quenched based on the second flow set value and the second flow actual value of the liquid to be quenched. The second opening is the output value of FC1

[0103] In the reactor control system, a low selector control module is also provided. The output value of FC2 and the output value of FC1 are transmitted to the low selector control module. In the low selector control module, the output value of FC2 and the output value of FC1 are compared, and the lower value is selected. The selected lower value is used to control the regulating valve FV1 for the liquid to be quenched

[0104] This is because when the reactor is operating normally, the heat transfer efficiency of the reactor jacket is maintained within the normal range at this time, and the cooling water flow is much smaller than the cooling water flow corresponding to the heat transfer limit. Since FC2 is a reverse-acting controller, the output of FC2 will be a maximum value and cannot be selected by the low selector control module. FC1 normally controls the feeding of the reactor, and the reactor is in an operating state of stable feeding and stable heat removal

[0105] If at a certain moment, the feeding amount of the reactor increases significantly or the reactant concentration increases significantly, under the action of the reactor temperature controller TC, the cooling water flow in the jacket continues to increase and gets closer and closer to the cooling water flow corresponding to the heat transfer limit. Since FC2 is a reverse-acting controller, the output value of FC2 continuously decreases until it is selected by the low selector control module to take over the regulating valve FV1 for the liquid to be quenched. Then, by reducing the reactant feeding amount, the further increase of the cooling water flow is avoided, thereby controlling the reactor temperature and avoiding the adverse consequences of continuous reactor temperature rise leading to interlock triggering or even over-temperature leakage

[0106] When the subsequent feed fluctuation is relieved, under the action of the reactor temperature controller TC, the flow rate of the jacket cooling water continuously decreases, moving further away from the cooling water flow rate corresponding to reaching the heat transfer limit. Since FC2 is a reverse-acting controller, the output value of FC2 continuously increases, and the output value of FC1 will be re-selected by the low-select control module to take over the quenching liquid regulating valve FV1. At this point, the reactor returns to the operating state of stable feed and stable heat removal.

[0107] For example, according to the information provided by the designers of the quenching reactor, the overall heat transfer coefficient K of the quenching reactor is approximately 300 W / (m 2 ·°C), the jacket heat transfer area S is 23.4 m 2 , the specific heat capacity C p of the cooling water is 4200 J / (kg·°C). The operator inputs the above information into the calculation block Y through the DCS screen. The calculated cooling water flow rate at the heat transfer limit is 7.8 kg / s. Therefore, the set value of the cooling water flow controller FC2 is 7.8 kg / s, while the cooling water flow rate during normal reaction under the design conditions is 2.4 kg / s.

[0108] At a certain moment, the concentration of alkyl aluminum in the feed to the quenching reactor increases significantly. Under the action of the reactor temperature controller TC, the flow rate of the jacket cooling water continuously increases, approaching the cooling water flow rate of 7.8 kg / s corresponding to reaching the heat transfer limit. Since the cooling water flow controller FC2 is a reverse-acting controller, the output value of FC2 continuously decreases until it is selected by the low-select control module to take over the quenching liquid regulating valve FV1. The quenching reactor avoids further increase in the cooling water flow rate by reducing the alkyl aluminum feed rate, thereby controlling the reactor temperature and avoiding the adverse consequences of continuous temperature rise in the quenching reactor leading to interlock triggering or even over-temperature leakage.

[0109] When the concentration of alkyl aluminum in the feed to the subsequent quenching reactor returns to normal, under the action of the reactor temperature controller TC, the flow rate of the jacket cooling water continuously decreases, moving further away from the cooling water flow rate of 7.8 kg / s corresponding to reaching the heat transfer limit. Since the cooling water flow controller FC2 is a reverse-acting controller, the output value of FC2 continuously increases, causing the output value of FC1 to be re-selected by the low-select control module to take over the reaction feed regulating valve FV1. At this point, the quenching reactor returns to the operating state of stable feed and stable heat removal.

[0110] It can be seen that the reactor temperature control strategy provided by the embodiments of the present invention can monitor the operating flow rate of the cooling water in real time and automatically calculate the heat transfer limit of the reactor jacket. When the heat transfer of the reactor is limited, the cooling water flow rate is used for override control of the reaction feed, improving the response speed of the reactor temperature control during load changes and enhancing the stability of the reaction temperature control.

[0111] In this embodiment, a reactor temperature control device is further provided. This device is used to implement the above-mentioned embodiments and preferred implementation manners, and those that have been described will not be repeated. As used hereinafter, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0112] This embodiment provides a reactor temperature control device, as Figure 7 shown, including:

[0113] A first acquisition module 701, configured to acquire the total heat transfer coefficient of the reactor, the heat exchange area of the reactor, and the specific heat capacity of the cooling water;

[0114] A flow rate set value determination module 702, configured to calculate a first flow rate set value of the cooling water according to the total heat transfer coefficient, the heat exchange area, and the specific heat capacity;

[0115] A second acquisition module 703, configured to acquire an actual value of the first flow rate of the cooling water;

[0116] A feed valve opening determination module 704, configured to obtain the theoretical opening of the feed valve of the quenching liquid to be when the temperature of the reactor cannot be reduced when the flow rate of the cooling water increases, based on the first flow rate set value and the actual value of the first flow rate.

[0117] In some alternative implementation manners, the reactor temperature control device further includes a third acquisition module. When the temperature of the reactor can be reduced when the flow rate of the cooling water increases, the third acquisition module is configured to respectively acquire a second flow rate set value and an actual value of the second flow rate of the quenching liquid to be; the feed valve opening determination module 704 is further configured to obtain the theoretical opening of the feed valve of the quenching liquid to be based on the second flow rate set value and the actual value of the second flow rate.

[0118] In some alternative implementation manners, the reactor temperature control device further includes a judgment module. Before obtaining the valve opening of the feed valve of the quenching liquid to be based on the first flow rate set value and the actual value of the first flow rate, the judgment module is configured to judge whether the actual value of the first flow rate is greater than or equal to the first flow rate set value; when the actual value of the first flow rate is greater than or equal to the first flow rate set value, it is determined that the temperature of the reactor cannot be reduced when the flow rate of the cooling water increases.

[0119] In some alternative implementation manners, before obtaining the valve opening of the feed valve of the quenching liquid to be based on the first flow rate set value and the actual value of the first flow rate, the judgment module is further configured to obtain a first opening of the feed valve of the quenching liquid to be based on the first flow rate set value and the actual value of the first flow rate; obtain a second opening of the feed valve of the quenching liquid to be based on the second flow rate set value and the actual value of the second flow rate;

[0120] When the first opening degree is less than or equal to the second opening degree, it is determined that the flow rate of the cooling water increases and the temperature of the reactor cannot be reduced.

[0121] In some alternative embodiments, the flow rate set value determination module 702 is specifically configured to: calculate a first flow rate set value of the cooling water according to the overall heat transfer coefficient, the heat transfer area, and the specific heat capacity by using a preset formula; the preset formula is wherein, W0 represents the first flow rate set value of the cooling water, K represents the overall heat transfer coefficient, S represents the heat transfer area, and Cp represents the specific heat capacity of the cooling water.

[0122] In some alternative embodiments, the flow rate of the cooling water is obtained according to the first flow rate set value and the actual first flow rate.

[0123] The further function descriptions of the above-mentioned various modules and units are the same as those in the corresponding above embodiments, and will not be elaborated herein.

[0124] The reactor temperature control device in this embodiment is presented in the form of functional units. Here, the unit refers to an ASIC (Application SpeciFCL Integrated Circuit) circuit, a processor and a memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0125] The embodiment of the present invention further provides a computer device having the above-mentioned Figure 7 shown reactor temperature control device.

[0126] Please refer to Figure 8 , Figure 8 is a schematic structural diagram of a computer device provided by an alternative embodiment of the present invention. As Figure 8 shown, the computer device includes: one or more processors 10, a memory 20, and an interface for connecting each component, including a high-speed interface and a low-speed interface. Each component communicates with each other through different buses and can be installed on a common main board or installed in other ways according to needs. The processor can process instructions executed within the computer device, including instructions stored in the memory or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some alternative embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 8 One processor 10 is taken as an example in

[0127] The processor 10 may be a central processing unit, a network processor, or a combination thereof. Among them, the processor 10 may further include a hardware chip. The above-mentioned hardware chip may be an application-specific integrated circuit, a programmable logic device, or a combination thereof. The above-mentioned programmable logic device may be a complex programmable logic device, a field programmable gate array, a generic array logic, or any combination thereof.

[0128] Among them, the memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiments. The memory 20 may include a program storage area and a data storage area. Among them, the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some alternative embodiments, the memory 20 may optionally include a memory remotely provided with respect to the processor 10, and these remote memories may be connected to the computer device through a network. Examples of the above-mentioned network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof. The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk, or a solid-state drive; the memory 20 may also include a combination of the above types of memories.

[0129] The computer device further includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30, and the output device 40 may be connected through a bus or other means, Figure 8 Taking connection through a bus as an example.

[0130] The input device 30 may receive input digital or character information, and generate key signal inputs related to the user settings and function control of the computer device, such as a touch screen, a keypad, a mouse, a trackpad, a touchpad, a pointing stick, one or more mouse buttons, a trackball, a joystick, etc. The output device 40 may include a display device, an auxiliary lighting device (such as an LED), and a tactile feedback device (such as a vibration motor), etc. The above-mentioned display device includes but is not limited to a liquid crystal display, a light-emitting diode, a display, and a plasma display. In some alternative embodiments, the display device may be a touch screen.

[0131] Embodiments of the present invention also provide a computer-readable storage medium. The method according to the embodiments of the present invention can be implemented in hardware, firmware, or be implemented as computer code that can be recorded on a storage medium, or be implemented as computer code that is originally stored in a remote storage medium or a non-transitory machine-readable storage medium and downloaded through a network and will be stored in a local storage medium. Thus, the method described herein can be stored as such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, or a solid-state drive, etc.; further, the storage medium can also include a combination of the above-mentioned types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by the computer, the processor, or the hardware, the method shown in the above embodiments is implemented.

[0132] A part of the present invention can be applied as a computer program product, such as computer program instructions. When executed by a computer, through the operation of the computer, the methods and / or technical solutions according to the present invention can be invoked or provided. Those skilled in the art should be able to understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executes the instructions, or the computer compiles the instructions and then executes the corresponding compiled program, or the computer reads and executes the instructions, or the computer reads and installs the instructions and then executes the corresponding installed program. Herein, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible by the computer.

[0133] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for controlling the temperature of a reactor, characterized in that, Including: Obtaining the overall heat transfer coefficient of the reactor, the heat transfer area of the reactor, and the specific heat capacity of the cooling water; Calculating a first flow rate set value of the cooling water according to the overall heat transfer coefficient, the heat transfer area, and the specific heat capacity; Obtaining an actual first flow rate value of the cooling water; When the temperature of the reactor cannot be reduced as the flow rate of the cooling water increases, obtaining a theoretical opening degree of the quenching liquid feed valve according to the first flow rate set value and the actual first flow rate value.

2. The method according to claim 1, characterized in that, Further including: When the temperature of the reactor can be reduced as the flow rate of the cooling water increases, respectively obtaining a second flow rate set value and an actual second flow rate value of the quenching liquid; Obtaining a theoretical opening degree of the quenching liquid feed valve according to the second flow rate set value and the actual second flow rate value.

3. The method according to claim 2, wherein Before obtaining the valve opening degree of the quenching liquid feed valve according to the first flow rate set value and the actual first flow rate value, further including: Judging whether the actual first flow rate value is greater than or equal to the first flow rate set value; When the actual first flow rate value is greater than or equal to the first flow rate set value, determining that the temperature of the reactor cannot be reduced as the flow rate of the cooling water increases.

4. The method according to claim 2, wherein Before obtaining the valve opening degree of the quenching liquid feed valve according to the first flow rate set value and the actual first flow rate value, further including: Obtaining a first opening degree of the quenching liquid feed valve according to the first flow rate set value and the actual first flow rate value; Obtaining a second opening degree of the quenching liquid feed valve according to the second flow rate set value and the actual second flow rate value; When the first opening degree is less than or equal to the second opening degree, determining that the temperature of the reactor cannot be reduced as the flow rate of the cooling water increases.

5. The method according to claim 1, wherein The calculating the first flow rate set value of the cooling water according to the overall heat transfer coefficient, the heat transfer area, and the specific heat capacity includes: Calculating the first flow rate set value of the cooling water according to the overall heat transfer coefficient, the heat transfer area, and the specific heat capacity by using a preset formula; The preset formula is Wherein, W0 represents the first flow rate set value of the cooling water, K represents the overall heat transfer coefficient, S represents the heat transfer area, and Cp represents the specific heat capacity of the cooling water.

6. The method according to any one of claims 1 to 5, characterized in that Further including: Obtaining a theoretical opening degree of the cooling water inlet valve according to the first flow rate set value and the actual first flow rate value.

7. A reactor temperature control device, characterized in that, The device includes: A first obtaining module, configured to obtain the overall heat transfer coefficient of the reactor, the heat transfer area of the reactor, and the specific heat capacity of the cooling water; A flow rate set value determining module, configured to calculate the first flow rate set value of the cooling water according to the overall heat transfer coefficient, the heat transfer area, and the specific heat capacity; A second obtaining module, configured to obtain the actual first flow rate value of the cooling water; A feed valve opening degree determining module, configured to obtain a theoretical opening degree of the quenching liquid feed valve according to the first flow rate set value and the actual first flow rate value when the temperature of the reactor cannot be reduced as the flow rate of the cooling water increases.

8. A computer device, characterized in that, Including: A memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to execute the reactor temperature control method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing a computer to execute the reactor temperature control method according to any one of claims 1 to 6.

10. A computer program product, characterized in that, It includes computer instructions for causing a computer to execute the reactor temperature control method according to any one of claims 1 to 6.

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