Temperature control method and device for catalyst reduction heating stage

Abstract

The invention provides a catalyst reduction heating stage temperature control method and device, and relates to the technical field of temperature control, and the method comprises the steps: when the opening degree of a steam pocket steam valve enters a first preset opening degree range, obtaining a preset PID parameter corresponding to a preset heating interval range through the main body temperature of a reduction reactor; a control deviation is obtained through the main body temperature of the reduction reactor and a standard heating rate curve; obtaining a target PID control quantity according to a preset PID parameter and the control deviation; when the opening degree of the heater steam valve enters a second preset opening degree range, comparing the lower temperature of the reduction reactor with the lower temperature of the preset reactor to obtain a temperature comparison result; and obtaining a heater steam valve control strategy according to the temperature comparison result, wherein the heater steam valve control strategy is used for adjusting the opening degree of the heater steam valve in real time by controlling the output amplitude and period. According to the invention, the reaction temperature rising rate is accurately controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature control, and in particular to a method and device for controlling temperature in a catalyst reduction heating stage. Background Art

[0002] Fischer-Tropsch synthesis is a chemical process that uses synthesis gas as a raw material to synthesize long-chain hydrocarbon compounds under specific catalysts and reaction conditions. The reduction and heating stage of the Fischer-Tropsch synthesis catalyst is an important link in the Fischer-Tropsch synthesis process, and its temperature control has an important impact on the overall process of Fischer-Tropsch synthesis. At present, the temperature control of the reduction and heating stage is mainly achieved by manually adjusting the valve to control the steam pressure and temperature entering the reactor. During the control process, due to the inconsistency and untimeliness of the operation, the temperature heating rate will also fluctuate to a certain extent, and manual adjustment cannot effectively and accurately control the reaction temperature heating rate. Summary of the invention

[0003] The problem solved by the invention is how to improve the temperature control accuracy in the catalyst reduction heating stage.

[0004] In order to solve the above problems, the present invention provides a method and device for controlling the temperature during the temperature rise stage of catalyst reduction.

[0005] In a first aspect, the present invention provides a method for controlling temperature in a catalyst reduction heating stage, comprising:

[0006] When the opening of the drum steam valve enters the first preset opening range, the preset PID parameters corresponding to the preset temperature rise interval are obtained by reducing the reactor body temperature;

[0007] Obtaining a control deviation through the reduction reactor main body temperature and a standard heating rate curve;

[0008] Obtaining a target PID control amount according to the preset PID parameter and the control deviation, wherein the target PID control amount is used to adjust the opening of the drum steam valve in real time;

[0009] When the opening of the heater steam valve enters the second preset opening range, comparing the temperature of the lower part of the reduction reactor with the preset lower temperature of the reactor to obtain a temperature comparison result;

[0010] A heater steam valve control strategy is obtained according to the temperature comparison result, and the heater steam valve control strategy is used to adjust the opening of the heater steam valve in real time by controlling the output amplitude and cycle.

[0011] Optionally, the opening of the drum steam valve is adjusted according to a first preset control period and a first preset output amplitude until it enters the first preset opening range;

[0012] The opening of the heater steam valve is adjusted according to a second preset control period and a second preset output amplitude until it enters the second preset opening range.

[0013] Optionally, obtaining a heater steam valve control strategy according to the temperature comparison result includes:

[0014] When the temperature of the lower part of the reduction reactor is lower than the preset lower part temperature of the reactor, determining whether the opening of the heater steam valve is lower than or equal to the first heater steam valve opening upper limit to obtain a first determination result;

[0015] Obtaining the heater steam valve control strategy according to the first judgment result;

[0016] When the temperature of the lower part of the reduction reactor is greater than or equal to the preset reactor lower part temperature, determining whether the opening of the heater steam valve is less than or equal to the second heater steam valve opening upper limit to obtain a second determination result, wherein the second heater steam valve opening upper limit is greater than the first heater steam valve opening upper limit;

[0017] The heater steam valve control strategy is obtained according to the second judgment result.

[0018] Optionally, obtaining the heater steam valve control strategy according to the first judgment result includes:

[0019] When the opening of the heater steam valve is less than the first heater steam valve opening upper limit, adjusting the opening of the heater steam valve according to the second preset control period and the second preset output amplitude;

[0020] When the opening of the heater steam valve is equal to the first heater steam valve opening upper limit, the opening of the heater steam valve is maintained at the first heater steam valve opening upper limit.

[0021] Optionally, obtaining the heater steam valve control strategy according to the second judgment result includes:

[0022] When the opening of the heater steam valve is less than the second heater steam valve opening upper limit, adjusting the opening of the heater steam valve according to a third preset control period and the second preset output amplitude;

[0023] When the opening of the heater steam valve is equal to the second heater steam valve opening upper limit, the opening of the heater steam valve is maintained at the second heater steam valve opening upper limit.

[0024] Optionally, obtaining the control deviation through the reduction reactor main body temperature and a standard heating rate curve comprises:

[0025] Obtaining the standard heating rate curve;

[0026] The control deviation is obtained by the reduction reactor body temperature and the standard heating rate curve, wherein the control deviation is used to represent the difference between the reduction reactor body temperature and a standard value corresponding to the standard heating rate curve under a first preset output limit.

[0027] Optionally, obtaining the standard heating rate curve includes:

[0028] When the temperature at the historical moment is lower than the preset standard temperature, the standard heating rate curve is obtained through the first temperature output amplitude;

[0029] When the temperature at the historical moment is greater than or equal to the preset standard temperature, the standard heating rate curve is obtained through a second temperature output amplitude, wherein the second temperature output amplitude is smaller than the first temperature output amplitude.

[0030] Optionally, obtaining a target PID control amount according to the preset PID parameter and the control deviation includes:

[0031] Obtaining an initial PID control amount according to the preset PID parameters and the control deviation;

[0032] A time comparison result is obtained by comparing the current system time and the hourly time, and the target PID control amount is obtained according to the initial PID control amount and the time comparison result.

[0033] Optionally, obtaining the target PID control amount according to the initial PID control amount and the time comparison result includes:

[0034] When the current time of the system is equal to the hourly time, a correction deviation is obtained through the reduction reactor main body temperature and the standard heating rate curve, wherein the correction deviation is used to represent the difference between the reduction reactor main body temperature and the corresponding standard value in the standard heating rate curve under a second preset output limit, and the second preset output limit is greater than the first preset output limit;

[0035] The initial PID control amount is corrected according to the correction deviation to obtain the target PID control amount.

[0036] In a second aspect, the present invention provides a temperature control device for a catalyst reduction heating stage, comprising: a preset PID parameter acquisition module, which is used to obtain a preset PID parameter corresponding to a preset heating interval range by reducing the reactor body temperature when the opening of the drum steam valve enters a first preset opening range;

[0037] A control deviation acquisition module, used to obtain the control deviation through the reduction reactor main body temperature and the standard heating rate curve;

[0038] A target PID control amount acquisition module, used to obtain a target PID control amount according to the preset PID parameter and the control deviation, wherein the target PID control amount is used to adjust the opening of the drum steam valve in real time;

[0039] A temperature comparison result acquisition module, used for comparing the temperature of the lower part of the reduction reactor with the preset lower temperature of the reactor to obtain a temperature comparison result when the opening of the heater steam valve enters a second preset opening range;

[0040] The heater steam valve control strategy acquisition module is used to obtain the heater steam valve control strategy according to the temperature comparison result, and the heater steam valve control strategy is used to adjust the opening of the heater steam valve in real time by controlling the output amplitude and period.

[0041] The beneficial effects of the temperature control method and device for the catalyst reduction heating stage of the present invention are as follows: when the opening of the drum steam valve enters the first preset opening range, the preset PID parameters corresponding to the preset heating interval range are obtained by using the temperature of the reduction reactor body, and different PID parameters are selected according to different temperatures during the heating process. The control deviation is obtained by the standard heating rate curve and the temperature of the reduction reactor body, and the obtained standard heating rate curve can better meet the actual control temperature requirements. The target PID control amount is obtained according to the preset PID parameters and the control deviation, so as to adjust the opening of the drum steam valve in the entire heating process in real time. When the opening of the heater steam valve enters the second preset opening range, the temperature of the lower part of the reduction reactor is compared with the temperature of the lower part of the preset reactor, and the output amplitude and cycle of the heater steam valve are controlled according to different situations, and the heater steam valve control strategy is obtained to achieve real-time adjustment of the opening of the heater steam valve. The temperature of the reduction reactor is controlled by the drum steam valve and the heater steam valve together, so as to achieve accurate control of the reaction temperature heating rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic flow chart of a temperature control method for a catalyst reduction heating stage according to an embodiment of the present invention;

[0043] Figure 2 It is a flow chart of a method for controlling a heating steam valve according to an embodiment of the present invention;

[0044] Figure 3 It is a schematic diagram of the processing process of the standard heating rate curve of an embodiment of the present invention;

[0045] Figure 4 Schematic diagram of a flow chart of a method for controlling a drum steam valve according to an embodiment of the present invention;

[0046] Figure 5 It is a schematic structural diagram of a temperature control device in the catalyst reduction heating stage according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0048] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0049] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0050] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0051] The names of the messages or information exchanged between multiple devices in the embodiments of the present invention are only used for illustrative purposes, and are not used to limit the scope of these messages or information.

[0052] In the related art, the temperature control method during the catalyst reduction heating stage is based on a catalyst reduction reactor of a Fischer-Tropsch synthesis device, wherein the catalyst reduction reactor of the Fischer-Tropsch synthesis device comprises a reduction reactor body, a drum steam valve and a heater steam valve, wherein the drum steam valve and the heater steam valve are connected to the reduction reactor body, wherein the reduction reactor body is used to provide a closed space for a Fischer-Tropsch synthesis catalyst to undergo a chemical reaction, wherein the drum steam valve is used to control the heating rate in the reduction reactor body by controlling the drum steam flow rate, and wherein the heater steam valve is used to control the heating rate in the reduction reactor body by controlling the heater steam flow rate.

[0053] In view of the problems existing in the above-mentioned related technologies, this embodiment provides a temperature control method and device during the temperature rise stage of catalyst reduction.

[0054] like Figure 1 As shown, a temperature control method for a catalyst reduction heating stage provided by an embodiment of the present invention comprises:

[0055] Step 110, when the opening of the drum steam valve enters a first preset opening range, a preset PID parameter corresponding to a preset temperature rise interval is obtained by reducing the reactor body temperature.

[0056] Specifically, the heat provided by the drum steam and the heat released by the reduction of the catalyst will directly affect the heating rate of the reactor temperature. In the early stage of the heating stage, the catalyst reduction reaction does not occur. In order to ensure the heating rate, the drum steam valve needs to be quickly adjusted to heat up. Start the drum steam valve program, and adjust the drum steam valve to the first preset opening range according to the control cycle T1 and the output amplitude ΔMV1 through the intelligent output control program. During the output of the drum steam valve, feedback is given on whether the program execution is successful based on the change in the drum steam flow rate.

[0057] In some more specific embodiments, in the first preset temperature rise interval (120°C to 200°C) in the preset temperature rise interval, the PID parameter ratio P is 0.1, the integral I is 5, the differential D is 0, the output lower limit is 0, the output upper limit is 55, the output amplitude limit is 0.02, and the control period is 10 seconds. In the second preset temperature rise interval (200°C to 255°C), the PID parameter ratio P is 0.1, the integral I is 5.3, the differential D is 0, the output lower limit is 0, the output upper limit is 55, the output amplitude limit is 0.02, and the control period is 10 seconds. In the third preset temperature rise interval (255°C to 260°C), the PID parameter ratio P is 0.2, the integral I is 5, the differential D is 0, the output lower limit is 0, the output upper limit is 55, the output amplitude limit is 0.02, and the control period is 10 seconds. In the fourth preset temperature rise range (260°C to 265°C), the PID parameter proportion P is 0.2, the integral I is 5, the differential D is 0, the output lower limit is 0, the output upper limit is 55, the output limit is 0.05, and the control period is 10 seconds.

[0058] Step 120, obtaining a control deviation through the reduction reactor main body temperature and a standard heating rate curve.

[0059] Specifically, in the middle and late stages of the heating phase, the catalyst begins to undergo a reduction reaction, and as the reactor temperature rises, the reduction reaction becomes increasingly intense, and the reaction releases more heat. At this time, the output amplitude of the drum steam control valve needs to be adjusted to ensure a stable heating rate. According to the confirmed heating start time, the set heating rate, and the reactor temperature range, the reactor temperature standard value is output according to the control cycle to obtain a standard heating rate curve.

[0060] Step 130, obtaining a target PID control amount according to the preset PID parameter and the control deviation, wherein the target PID control amount is used to adjust the opening of the drum steam valve in real time.

[0061] Specifically, PID (Proportional Integral Differential) control is a technology widely used in industrial process control, especially for occasions where continuous variables such as temperature and pressure need to be accurately adjusted. In the temperature control of the reduction reactor, the PID controller adjusts the working state of the heating or cooling device by comparing the difference between the actual measured temperature value and the preset standard heating rate curve (i.e., control deviation) to achieve the ideal temperature control effect.

[0062] Step 140: When the opening of the heater steam valve enters a second preset opening range, the temperature of the lower portion of the reduction reactor is compared with the preset temperature of the lower portion of the reactor to obtain a temperature comparison result.

[0063] Specifically, in the early stage of the heating stage, the catalyst reduction reaction does not occur, and the heater steam valve needs to be quickly opened to assist the heating. The heater steam valve program is started, and the heater steam valve is output according to the control period T2 and the output amplitude ΔMV2 through the intelligent output control program to enter the second preset opening range. During the heater steam valve output period, the program execution is fed back based on the change of the feed heater steam flow rate to see whether it is successful.

[0064] Step 150 , obtaining a heater steam valve control strategy according to the temperature comparison result, wherein the heater steam valve control strategy is used to adjust the opening of the heater steam valve in real time by controlling the output amplitude and period.

[0065] Specifically, the heater steam valve pair is controlled according to the temperature comparison result to obtain the heater steam valve control strategy, which provides sufficient heat for the early stage of heating and avoids the reaction temperature being too low in the early stage of heating.

[0066] In this embodiment, when the opening of the drum steam valve enters the first preset opening range, the preset PID parameters corresponding to the preset temperature rise interval range are obtained by using the main temperature of the reduction reactor, and different PID parameters are selected according to the different temperatures during the heating process. The control deviation is obtained by the standard heating rate curve and the main temperature of the reduction reactor, and the obtained standard heating rate curve can better meet the actual control temperature needs. The target PID control amount is obtained according to the preset PID parameters and the control deviation, so as to adjust the opening of the drum steam valve in the entire heating process in real time. When the opening of the heater steam valve enters the second preset opening range, the lower temperature of the reduction reactor and the preset lower temperature of the reactor are compared, and the output amplitude and cycle of the heater steam valve are controlled according to different situations, and the heater steam valve control strategy is obtained to realize the real-time adjustment of the opening of the heater steam valve. The temperature of the reduction reactor is controlled by the drum steam valve and the heater steam valve together, and the reaction temperature heating rate is accurately controlled.

[0067] Optionally, the opening of the drum steam valve is adjusted according to a first preset control period and a first preset output amplitude until it enters the first preset opening range;

[0068] The opening of the heater steam valve is adjusted according to a second preset control period and a second preset output amplitude until it enters the second preset opening range.

[0069] In some more specific embodiments, the drum steam valve program is started, and the drum steam valve is quickly adjusted to a preset opening according to the control period T1 and the output amplitude ΔMV1 through the intelligent output control program, and the success of the program execution is fed back according to the change of the drum steam flow rate during the output of the drum steam valve. The heater steam valve program is started, and the heater steam valve is output according to the control period T2 and the output amplitude ΔMV2 through the intelligent output control program. The success of the program execution is fed back according to the change of the feed heater steam flow rate during the output of the heater steam valve.

[0070] Optionally, obtaining a heater steam valve control strategy according to the temperature comparison result includes:

[0071] When the temperature of the lower part of the reduction reactor is lower than the preset lower part temperature of the reactor, determining whether the opening of the heater steam valve is lower than or equal to the first heater steam valve opening upper limit to obtain a first determination result;

[0072] Obtaining the heater steam valve control strategy according to the first judgment result;

[0073] When the temperature of the lower part of the reduction reactor is greater than or equal to the preset reactor lower part temperature, determining whether the opening of the heater steam valve is less than or equal to the second heater steam valve opening upper limit to obtain a second determination result, wherein the second heater steam valve opening upper limit is greater than the first heater steam valve opening upper limit;

[0074] The heater steam valve control strategy is obtained according to the second judgment result.

[0075] Optionally, obtaining the heater steam valve control strategy according to the first judgment result includes:

[0076] When the opening of the heater steam valve is less than the first heater steam valve opening upper limit, adjusting the opening of the heater steam valve according to the second preset control period and the second preset output amplitude;

[0077] When the opening of the heater steam valve is equal to the first heater steam valve opening upper limit, the opening of the heater steam valve is maintained at the first heater steam valve opening upper limit.

[0078] Specifically, the opening of the heater steam valve and the first heater steam valve opening upper limit are continuously judged, and there is no case where the opening of the heater steam valve is greater than the first heater steam valve opening upper limit.

[0079] Optionally, obtaining the heater steam valve control strategy according to the second judgment result includes:

[0080] When the opening of the heater steam valve is less than the second heater steam valve opening upper limit, adjusting the opening of the heater steam valve according to a third preset control period and the second preset output amplitude;

[0081] When the opening of the heater steam valve is equal to the second heater steam valve opening upper limit, the opening of the heater steam valve is maintained at the second heater steam valve opening upper limit.

[0082] Specifically, the opening of the heater steam valve and the second heater steam valve opening upper limit are continuously judged, and there is no case where the opening of the heater steam valve is greater than the second heater steam valve opening upper limit.

[0083] In some more specific embodiments, in combination Figure 2 As shown, after the feed heating steam valve control program is started, it is determined whether the temperature of the lower part of the reduction reactor is less than the preset reactor lower temperature, wherein the preset reactor lower temperature is preferably 160°C. When the temperature of the lower part of the reduction reactor is less than the preset reactor lower temperature, it is determined whether the opening (MV) of the heater steam valve is less than the upper limit of the opening of the first heater steam valve, wherein the upper limit of the opening of the first heater steam valve is preferably 40. When the opening of the heater steam valve is less than the upper limit of the opening of the first heater steam valve, the opening output value of the heater steam valve is calculated according to the second preset control cycle and the second preset output amplitude, and the opening of the heater steam valve is adjusted according to the opening output value of the heater steam valve; when the opening of the heater steam valve is equal to the upper limit of the opening of the first heater steam valve, the opening of the heater steam valve is maintained at the upper limit of the opening of the first heater steam valve. It is determined whether the opening (MV) of the heater steam valve is less than the upper limit of the opening of the second heater steam valve (MVH), wherein the upper limit of the opening of the second heater steam valve is preferably 65. When the opening of the heater steam valve is less than the second heater steam valve opening upper limit, the opening output value of the heater steam valve is calculated according to the third preset control cycle and the second preset output amplitude, and the opening of the heater steam valve is adjusted according to the opening output value of the heater steam valve; when the opening of the heater steam valve is equal to the second heater steam valve opening upper limit, the opening of the heater steam valve is maintained at the second heater steam valve opening upper limit. Repeatedly read the lower temperature of the reduction reactor and the preset lower temperature of the reactor to determine whether the lower temperature of the reduction reactor is less than the preset lower temperature of the reactor until the reaction is completed. Among them, when the lower temperature of the reactor (lower than 160°C), the output lower limit is 0, the output upper limit is 40, the output limit is 5, and the control cycle is 5 minutes. When the lower temperature of the reactor (higher than 160°C), the output lower limit is 0, the output upper limit is 65, the output limit is 5, and the control cycle is 45 minutes.

[0084] In this optional embodiment, in the early stage of the reactor temperature rise phase, the heater steam valve is controlled by an intelligent program to provide sufficient heat for the early stage of temperature rise, thereby avoiding low reaction temperature in the early stage of temperature rise.

[0085] Optionally, obtaining the control deviation through the reduction reactor main body temperature and a standard heating rate curve comprises:

[0086] Obtaining the standard heating rate curve;

[0087] The control deviation is obtained by the reduction reactor body temperature and the standard heating rate curve, wherein the control deviation is used to represent the difference between the reduction reactor body temperature and a standard value corresponding to the standard heating rate curve under a first preset output limit.

[0088] Specifically, the horizontal axis of the standard heating rate curve is time / h, and the vertical axis is temperature / °C. The current reaction time corresponds to the time on the standard heating rate curve, the temperature on the standard heating rate curve is read as the standard value, and the control deviation is obtained by comparing the difference between the main temperature of the reduction reactor and the standard value corresponding to the standard heating rate curve. The first preset output limit is used to represent the control deviation of the maximum output.

[0089] Optionally, obtaining the standard heating rate curve includes:

[0090] When the temperature at the historical moment is lower than the preset standard temperature, the standard heating rate curve is obtained through the first temperature output amplitude;

[0091] When the temperature at the historical moment is greater than or equal to the preset standard temperature, the standard heating rate curve is obtained through a second temperature output amplitude, wherein the second temperature output amplitude is smaller than the first temperature output amplitude.

[0092] In some more specific embodiments, in combination Figure 3As shown, the time point of starting the temperature rise switch is recorded, compared with the system time, and the temperature rise rate is confirmed and corrected to be output at the whole point or half point, and the starting time of the temperature rise is determined. Determine whether the temperature at the historical moment is less than the preset standard temperature, wherein the preset standard temperature is preferably 260. When the temperature at the historical moment is less than the preset standard temperature, output data through the first temperature output amplitude, wherein the first temperature output amplitude is preferably 10°C / h; when the temperature at the historical moment is greater than or equal to the preset standard temperature, output data through the second temperature output amplitude, that is, a partial temperature curve, wherein the second temperature output amplitude is preferably 5°C / h. After obtaining the partial temperature curve, determine whether the maximum temperature output of the partial temperature curve is greater than or equal to the preset standard temperature upper limit, wherein the preset standard temperature upper limit is preferably 265. When the output data is greater than or equal to the preset standard temperature upper limit, the partial temperature curve is used as the standard temperature rise rate curve. When the output data is less than the preset standard temperature upper limit, re-determine whether the temperature at the historical moment is less than the preset standard temperature.

[0093] In this optional embodiment, the reactor temperature setting value is output according to the confirmed temperature rise start time, the set temperature rise rate, and the reactor temperature interval according to the control cycle. By setting the precise temperature rise rate and target temperature, the chemical reaction can be ensured to be carried out under the optimal conditions.

[0094] Optionally, obtaining a target PID control amount according to the preset PID parameter and the control deviation includes:

[0095] Obtaining an initial PID control amount according to the preset PID parameters and the control deviation;

[0096] A time comparison result is obtained by comparing the current system time and the hourly time, and the target PID control amount is obtained according to the initial PID control amount and the time comparison result.

[0097] Optionally, obtaining the target PID control amount according to the initial PID control amount and the time comparison result includes:

[0098] When the current time of the system is equal to the hourly time, a correction deviation is obtained through the reduction reactor main body temperature and the standard heating rate curve, wherein the correction deviation is used to represent the difference between the reduction reactor main body temperature and the corresponding standard value in the standard heating rate curve under a second preset output limit, and the second preset output limit is greater than the first preset output limit;

[0099] The initial PID control amount is corrected according to the correction deviation to obtain the target PID control amount.

[0100] In some more specific embodiments, in combination Figure 4As shown, the drum steam valve is adjusted to a preset opening, and the preset PID parameters called are determined by reducing the reactor body temperature, wherein the reduction reactor body temperature includes the reactor temperature and the reactor heat release data. The standard heating rate curve and the reduction reactor body temperature are read to determine the control deviation, and the PID program is called to calculate according to the control deviation, wherein the calling PID program is used to represent the PID program obtained by calling the preset PID parameters. The current time of the system is read and compared with the next hourly time to determine whether the current time of the system is equal to the next hourly time. When the current time of the system is not equal to the hourly time, the PID calculation result is read, the drum steam valve opening is adjusted to the calculated value, and an output is completed. When the current time of the system is equal to the hourly time, the standard heating rate curve and the reduction reactor body temperature are read, the control deviation is calculated, the drum steam valve opening is corrected, and an output is completed. Repeatedly obtain the reduction reactor body temperature to determine the preset PID parameters called until the heating process ends.

[0101] In this optional embodiment, the opening of the boiler drum steam valve is read, and according to the actual temperature of the reactor, the designed public PID algorithm is called to automatically select appropriate PID parameters for calculation and output the actual required opening of the boiler drum steam valve to ensure the stability of the reactor temperature rise rate.

[0102] In some more specific embodiments, the reactor temperature control loop structure is designed according to the characteristics of the Fischer-Tropsch synthesis catalyst reduction process flow. By analyzing the characteristics of the reduction reactor temperature control process, the factors affecting the temperature rise rate of the reduction reactor are mainly: drum steam flow rate; feed heater steam flow rate; reduction reaction exothermic conditions; purified gas flow rate; steam pressure; steam temperature.

[0103] like Figure 5 As shown, a temperature control device for a catalyst reduction heating stage provided by an embodiment of the present invention comprises:

[0104] A preset PID parameter acquisition module 10 is used to obtain a preset PID parameter corresponding to a preset temperature rise interval range by reducing the reactor body temperature when the opening of the drum steam valve enters a first preset opening range;

[0105] A control deviation acquisition module 20, used to obtain the control deviation through the reduction reactor main body temperature and the standard heating rate curve;

[0106] A target PID control amount acquisition module 30, used to obtain a target PID control amount according to the preset PID parameter and the control deviation, wherein the target PID control amount is used to adjust the opening of the drum steam valve in real time;

[0107] The temperature comparison result acquisition module 40 is used to compare the temperature of the lower part of the reduction reactor with the preset lower temperature of the reactor to obtain a temperature comparison result when the opening of the heater steam valve enters the second preset opening range;

[0108] The heater steam valve control strategy acquisition module 50 is used to obtain the heater steam valve control strategy according to the temperature comparison result, and the heater steam valve control strategy is used to adjust the opening of the heater steam valve in real time by controlling the output amplitude and period.

[0109] The temperature control device for the catalyst reduction heating stage of this embodiment is used to implement the temperature control method for the catalyst reduction heating stage as described above. Its advantages over the prior art are the same as the advantages of the temperature control method for the catalyst reduction heating stage as described above, and will not be repeated here.

[0110] Optionally, the opening of the drum steam valve is adjusted according to a first preset control period and a first preset output amplitude until it enters the first preset opening range;

[0111] The opening of the heater steam valve is adjusted according to a second preset control period and a second preset output amplitude until it enters the second preset opening range.

[0112] Optionally, the heater steam valve control strategy acquisition module 50 is specifically used to: when the temperature of the lower part of the reduction reactor is lower than the preset reactor lower part temperature, determine whether the opening of the heater steam valve is less than or equal to the first heater steam valve opening upper limit to obtain a first judgment result;

[0113] Obtaining the heater steam valve control strategy according to the first judgment result;

[0114] When the temperature of the lower part of the reduction reactor is greater than or equal to the preset reactor lower part temperature, determining whether the opening of the heater steam valve is less than or equal to the second heater steam valve opening upper limit to obtain a second determination result, wherein the second heater steam valve opening upper limit is greater than the first heater steam valve opening upper limit;

[0115] The heater steam valve control strategy is obtained according to the second judgment result.

[0116] Optionally, the heater steam valve control strategy acquisition module 50 is specifically used to: when the opening of the heater steam valve is less than the first heater steam valve opening upper limit, adjust the opening of the heater steam valve according to the second preset control period and the second preset output amplitude;

[0117] When the opening of the heater steam valve is equal to the first heater steam valve opening upper limit, the opening of the heater steam valve is maintained at the first heater steam valve opening upper limit.

[0118] Optionally, the heater steam valve control strategy acquisition module 50 is specifically used to: when the opening of the heater steam valve is less than the second heater steam valve opening upper limit, adjust the opening of the heater steam valve according to a third preset control cycle and the second preset output amplitude;

[0119] When the opening of the heater steam valve is equal to the second heater steam valve opening upper limit, the opening of the heater steam valve is maintained at the second heater steam valve opening upper limit.

[0120] Optionally, the control deviation acquisition module 20 is specifically used to: acquire the standard heating rate curve;

[0121] The control deviation is obtained by the reduction reactor body temperature and the standard heating rate curve, wherein the control deviation is used to represent the difference between the reduction reactor body temperature and a standard value corresponding to the standard heating rate curve under a first preset output limit.

[0122] Optionally, the control deviation acquisition module 20 is specifically used to: when the temperature at a historical moment is less than a preset standard temperature, obtain the standard heating rate curve through the first temperature output amplitude;

[0123] When the temperature at the historical moment is greater than or equal to the preset standard temperature, the standard heating rate curve is obtained through a second temperature output amplitude, wherein the second temperature output amplitude is smaller than the first temperature output amplitude.

[0124] Optionally, the target PID control amount acquisition module 30 is specifically used to: obtain an initial PID control amount according to the preset PID parameter and the control deviation;

[0125] A time comparison result is obtained by comparing the current system time and the hourly time, and the target PID control amount is obtained according to the initial PID control amount and the time comparison result.

[0126] Optionally, the target PID control amount acquisition module 30 is specifically used to: when the current time of the system is equal to the hourly time, obtain a correction deviation through the reduction reactor main body temperature and the standard heating rate curve, wherein the correction deviation is used to represent the difference between the reduction reactor main body temperature and the corresponding standard value in the standard heating rate curve under a second preset output limit, and the second preset output limit is greater than the first preset output limit;

[0127] The initial PID control amount is corrected according to the correction deviation to obtain the target PID control amount.

[0128] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A temperature control method for a catalyst reduction heating stage, characterized in that: include: When the opening of the drum steam valve enters the first preset opening range, the preset PID parameters corresponding to the preset temperature rise interval are obtained by reducing the reactor body temperature; Obtaining a control deviation through the reduction reactor main body temperature and a standard heating rate curve; Obtaining a target PID control amount according to the preset PID parameter and the control deviation, wherein the target PID control amount is used to adjust the opening of the drum steam valve in real time; When the opening of the heater steam valve enters the second preset opening range, comparing the temperature of the lower part of the reduction reactor with the preset lower temperature of the reactor to obtain a temperature comparison result; A heater steam valve control strategy is obtained according to the temperature comparison result, and the heater steam valve control strategy is used to adjust the opening of the heater steam valve in real time by controlling the output amplitude and cycle.

2. The temperature control method for the catalyst reduction heating stage according to claim 1, characterized in that: Also includes: adjusting the opening of the drum steam valve according to a first preset control period and a first preset output amplitude until the first preset opening range is reached; The opening of the heater steam valve is adjusted according to a second preset control period and a second preset output amplitude until it enters the second preset opening range.

3. The temperature control method for the catalyst reduction heating stage according to claim 2, characterized in that: The step of obtaining a heater steam valve control strategy according to the temperature comparison result includes: When the temperature of the lower part of the reduction reactor is lower than the preset lower part temperature of the reactor, determining whether the opening of the heater steam valve is lower than or equal to the first heater steam valve opening upper limit to obtain a first determination result; Obtaining the heater steam valve control strategy according to the first judgment result; When the temperature of the lower part of the reduction reactor is greater than or equal to the preset reactor lower part temperature, determining whether the opening of the heater steam valve is less than or equal to the second heater steam valve opening upper limit to obtain a second determination result, wherein the second heater steam valve opening upper limit is greater than the first heater steam valve opening upper limit; The heater steam valve control strategy is obtained according to the second judgment result.

4. The temperature control method for the catalyst reduction heating stage according to claim 3, characterized in that: The step of obtaining the heater steam valve control strategy according to the first judgment result includes: When the opening of the heater steam valve is less than the first heater steam valve opening upper limit, adjusting the opening of the heater steam valve according to the second preset control period and the second preset output amplitude; When the opening of the heater steam valve is equal to the first heater steam valve opening upper limit, the opening of the heater steam valve is maintained at the first heater steam valve opening upper limit.

5. The temperature control method for the catalyst reduction heating stage according to claim 4, characterized in that: The step of obtaining the heater steam valve control strategy according to the second judgment result includes: When the opening of the heater steam valve is less than the second heater steam valve opening upper limit, adjusting the opening of the heater steam valve according to a third preset control period and the second preset output amplitude; When the opening of the heater steam valve is equal to the second heater steam valve opening upper limit, the opening of the heater steam valve is maintained at the second heater steam valve opening upper limit.

6. The temperature control method for the catalyst reduction heating stage according to claim 1, characterized in that: The control deviation is obtained by using the reduction reactor main body temperature and the standard heating rate curve, including: Obtaining the standard heating rate curve; The control deviation is obtained by the reduction reactor body temperature and the standard heating rate curve, wherein the control deviation is used to represent the difference between the reduction reactor body temperature and a standard value corresponding to the standard heating rate curve under a first preset output limit.

7. The temperature control method for the catalyst reduction heating stage according to claim 6, characterized in that: The step of obtaining the standard heating rate curve comprises: When the temperature at the historical moment is lower than the preset standard temperature, the standard heating rate curve is obtained through the first temperature output amplitude; When the temperature at the historical moment is greater than or equal to the preset standard temperature, the standard heating rate curve is obtained through a second temperature output amplitude, wherein the second temperature output amplitude is smaller than the first temperature output amplitude.

8. The temperature control method for the catalyst reduction heating stage according to claim 7, characterized in that: The obtaining of a target PID control amount according to the preset PID parameter and the control deviation comprises: Obtaining an initial PID control amount according to the preset PID parameters and the control deviation; A time comparison result is obtained by comparing the current system time and the hourly time, and the target PID control amount is obtained according to the initial PID control amount and the time comparison result.

9. The temperature control method for the catalyst reduction heating stage according to claim 8, characterized in that: The step of obtaining the target PID control amount according to the initial PID control amount and the time comparison result includes: When the current time of the system is equal to the hourly time, a correction deviation is obtained through the reduction reactor main body temperature and the standard heating rate curve, wherein the correction deviation is used to represent the difference between the reduction reactor main body temperature and the corresponding standard value in the standard heating rate curve under a second preset output limit, and the second preset output limit is greater than the first preset output limit; The initial PID control amount is corrected according to the correction deviation to obtain the target PID control amount.

10. A temperature control device for the catalyst reduction heating stage, characterized in that: include: A preset PID parameter acquisition module, used to obtain a preset PID parameter corresponding to a preset temperature rise interval range by reducing the reactor body temperature when the opening of the drum steam valve enters a first preset opening range; A control deviation acquisition module, used to obtain the control deviation through the reduction reactor main body temperature and the standard heating rate curve; A target PID control amount acquisition module, used to obtain a target PID control amount according to the preset PID parameter and the control deviation, wherein the target PID control amount is used to adjust the opening of the drum steam valve in real time; A temperature comparison result acquisition module, used for comparing the temperature of the lower part of the reduction reactor with the preset lower temperature of the reactor to obtain a temperature comparison result when the opening of the heater steam valve enters a second preset opening range; The heater steam valve control strategy acquisition module is used to obtain the heater steam valve control strategy according to the temperature comparison result, and the heater steam valve control strategy is used to adjust the opening of the heater steam valve in real time by controlling the output amplitude and period.

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