Preheating furnace control method and electronic equipment

Abstract

The invention discloses a preheating furnace control method and electronic equipment. The method comprises the steps that an initial flow value, a real-time flow value and a target flow value of a preheating furnace inlet and a real-time outlet temperature and a target outlet temperature of a preheating furnace outlet are obtained; according to the initial flow value, the real-time flow value is adjusted to be larger than or equal to the initial flow value; and according to the target flow value and the target outlet temperature, a preheating furnace control strategy is executed, so that the real-time flow value is larger than or equal to the target flow value, and the real-time outlet temperature is larger than or equal to the target outlet temperature. After the inlet gas flow of the preheating furnace is adjusted to the initial value, the strategy of adjusting the flow and the outlet temperature of the preheating furnace is set at the same time in stages, so that the operation error rate is reduced, and simultaneous heating and quantity increasing of the natural gas preheating furnace of the acetylene device are automatically and flexibly achieved.

Description

Technical Field

[0001] The invention relates to the technical field related to chemical automatic control, and in particular to a preheating furnace control method and electronic equipment. Background Art

[0002] The acetylene plant uses the natural gas partial oxidation method to produce acetylene. In the absence of any catalyst and heat carrier, a flame reaction is carried out. At the same time and in the same space, a part of the natural gas is burned with oxygen to release heat, which is used as the energy source for the cracking of the other part of the natural gas into acetylene. During the start-up phase of the acetylene plant, the Distributed Control System (DCS) operation volume of the natural gas preheating furnace temperature increase process is large, accounting for more than 50% of the operation volume of the entire acetylene plant start-up process. The internal operator needs to frequently adjust the fuel gas volume regulating valve and the natural gas feed volume to ensure that the natural gas preheating furnace temperature and natural gas feed load are increased at a certain rate. The existing operation method not only has a high error rate and is inconvenient to maintain, but also greatly increases the risk caused by insufficient operating experience of personnel during the start-up phase. Summary of the invention

[0003] Based on this, it is necessary to provide a preheating furnace control method and electronic equipment to address the technical problems of the prior art.

[0004] The present invention provides a preheating furnace control method, comprising:

[0005] Obtaining the initial flow value, real-time flow value and target flow value of the preheating furnace inlet, and the real-time outlet temperature and target outlet temperature of the preheating furnace outlet;

[0006] According to the initial flow value, adjusting the real-time flow value to be greater than or equal to the initial flow value;

[0007] According to the target flow value and the target outlet temperature, a preheating furnace control strategy is executed so that the real-time flow value is greater than or equal to the target flow value and the real-time outlet temperature is greater than or equal to the target outlet temperature.

[0008] Further, adjusting the real-time flow value to be greater than or equal to the initial flow value according to the initial flow value includes:

[0009] Setting the initial waiting time, the initial adjustment amount, and setting the flow controller to the first adjustment mode;

[0010] In the first adjustment mode, the real-time flow value is adjusted to increase by the initial adjustment amount at each interval of the initial waiting time until the real-time flow value is greater than or equal to the initial flow value.

[0011] Further, the control strategy includes a first control strategy and a second control strategy, and the preheating furnace control strategy is executed according to the target flow value and the target outlet temperature, so that the real-time flow value is greater than or equal to the target flow value and the real-time outlet temperature is greater than or equal to the target outlet temperature, including:

[0012] Set the flow controller to the second adjustment mode;

[0013] Acquire a first flow value and a first outlet temperature of the preheating furnace, wherein the initial flow value is less than the first flow value, and the first flow value is less than the target flow value, and the first outlet temperature is less than the target outlet temperature;

[0014] In the second adjustment mode:

[0015] Executing a first control strategy and an automatic temperature adjustment correction strategy according to the first flow value and the first outlet temperature;

[0016] According to the target flow value and the target outlet temperature, a second control strategy and an automatic correction strategy for the temperature adjustment amount are executed.

[0017] Further, executing a first control strategy according to the first flow value and the first outlet temperature includes:

[0018] Setting a first flow waiting time and a first adjustment amount;

[0019] The real-time flow value is adjusted to increase by the first adjustment amount at each interval of the first flow waiting time, until the real-time flow value is greater than or equal to the first flow value.

[0020] Further, executing a first control strategy according to the first flow value and the first outlet temperature further includes:

[0021] Set the first temperature waiting time, the first heating rate interval minimum value, the first heating rate interval maximum value, the first outlet temperature increase and the first outlet temperature decrease, the second temperature waiting time and the first outlet temperature correction value;

[0022] Calculate the outlet temperature change rate;

[0023] At each interval of the first temperature waiting time, if the outlet temperature change rate is less than the minimum value of the first heating rate interval, the real-time outlet temperature is adjusted to increase by the first outlet temperature increase amount; if the outlet temperature change rate is greater than the maximum value of the first heating rate interval, the real-time outlet temperature is adjusted to decrease by the first outlet temperature decrease amount, until the real-time outlet temperature is greater than or equal to the first outlet temperature;

[0024] At each interval of the second temperature waiting time, if the real-time outlet temperature is less than the first outlet temperature, the real-time outlet temperature is adjusted to increase by the first outlet temperature correction amount until the real-time outlet temperature is greater than or equal to the first outlet temperature.

[0025] Further, the calculating the outlet temperature change rate includes:

[0026] Obtain the actual value of the outlet temperature at the rate interval time and the time point backwards of the rate interval time;

[0027] The outlet temperature change rate is calculated as:

[0028]

[0029] Among them, R a is the outlet temperature change rate, T N is the real-time outlet temperature, T B is the actual value of the outlet temperature, and Δt is the rate interval time.

[0030] Further, executing a second control strategy according to the target flow value and the target outlet temperature includes:

[0031] Setting a second flow waiting time and a second adjustment amount;

[0032] The real-time flow value is adjusted to increase by the second adjustment amount at each interval of the second flow waiting time until the real-time flow value is greater than or equal to the target flow value.

[0033] Further, executing the second control strategy according to the target flow value and the target outlet temperature also includes:

[0034] Setting a third temperature waiting time, a second heating rate interval minimum value, a second heating rate interval maximum value, a second outlet temperature increment, and a second outlet temperature decrement, wherein the first outlet temperature is less than the target outlet temperature;

[0035] At each interval of the third temperature waiting time, if the outlet temperature change rate is less than the minimum value of the second heating rate interval, the real-time outlet temperature is adjusted to increase by the second outlet temperature increase amount; if the outlet temperature change rate is greater than the maximum value of the second heating rate interval, the real-time outlet temperature is adjusted to decrease by the second outlet temperature decrease amount, until the real-time outlet temperature is greater than or equal to the average value of the first outlet temperature and the target outlet temperature;

[0036] Set the fourth temperature waiting time, the third heating rate interval minimum value, the third heating rate interval maximum value, the third outlet temperature increase and the third outlet temperature decrease, wherein the third heating rate interval minimum value is less than the second heating rate interval minimum value, and the third heating rate interval maximum value is less than the second heating rate interval maximum value;

[0037] At each interval of the fourth temperature waiting time, if the outlet temperature change rate is less than the minimum value of the third heating rate interval, the real-time outlet temperature is adjusted to increase the third outlet temperature increase; if the outlet temperature change rate is greater than the maximum value of the third heating rate interval, the real-time outlet temperature is reduced by the third outlet temperature decrement until the real-time outlet temperature is greater than or equal to the target outlet temperature.

[0038] Furthermore, the automatic correction strategy for executing the temperature adjustment amount includes:

[0039] Set the time interval, the minimum value of the outlet temperature change rate suitable interval, and the maximum value of the outlet temperature change rate suitable interval;

[0040] Obtaining an outlet temperature adjustment amount and an average value of the outlet temperature change rate within the time interval, wherein the outlet temperature adjustment amount includes a first outlet temperature increase, a first outlet temperature decrease, a second outlet temperature increase, a second outlet temperature decrease, a third outlet temperature increase, and a third outlet temperature decrease;

[0041] When the average value of the outlet temperature change rate is less than the minimum value of the outlet temperature change rate suitable interval, the outlet temperature adjustment amount is adjusted as follows:

[0042] X=A×X

[0043] When the average value of the outlet temperature change rate is greater than the maximum value of the outlet temperature change rate suitable interval, the outlet temperature adjustment amount is adjusted as follows:

[0044] X=B×X

[0045] Wherein, X is the outlet temperature adjustment amount, A is a first constant greater than 1, and B is a second constant less than 1.

[0046] The present invention provides an electronic device, comprising:

[0047] at least one processor; and,

[0048] a memory communicatively connected to at least one of the processors; wherein,

[0049] The memory stores instructions that can be executed by at least one of the processors. The instructions are executed by at least one of the processors to enable the at least one of the processors to perform the preheating furnace control method as described above.

[0050] The present invention adjusts the inlet gas flow rate of the preheating furnace to the initial value, and then sets the flow rate and outlet temperature strategy of the preheating furnace in stages. The flow rate adjustment target value and outlet temperature adjustment target value of each stage are set. In the outlet temperature adjustment process, the outlet temperature change rate interval and the outlet temperature change rate suitable interval of each stage are also set. When the outlet temperature change rate is not in the outlet temperature change rate interval, the real-time outlet temperature needs to be additionally adjusted; when the flow rate and outlet temperature simultaneously meet the respective target values ​​of this stage, the next stage is entered until the flow rate and outlet temperature simultaneously reach their respective final target values. Thereby reducing the error rate of operation, automatically and flexibly realizing the simultaneous heating and volume increase of the natural gas preheating furnace of the acetylene device. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a working flow chart of a preheating furnace control method according to an embodiment of the present invention;

[0052] Figure 2 This is a work flow chart of a preheating furnace control method according to another embodiment of the present invention;

[0053] Figure 3 This is a flow chart of automatic control of increasing volume and temperature in a preferred embodiment of the present invention;

[0054] Figure 4 This is a logical schematic diagram of the initial stage volume increase process in a preferred embodiment of the present invention;

[0055] Figure 5 A logical schematic diagram of the volume-increasing process in a preferred embodiment of the present invention;

[0056] Figure 6 A logical schematic diagram of the heating process in a preferred embodiment of the present invention;

[0057] Figure 7 The figure is a schematic diagram of the hardware structure of an electronic device of the present invention. DETAILED DESCRIPTION

[0058] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. The same components are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0059] like Figure 1The figure shows a working flow chart of a preheating furnace control method according to an embodiment of the present invention, comprising:

[0060] Step S101, obtaining an initial flow value, a real-time flow value and a target flow value at the inlet of the preheating furnace, and a real-time outlet temperature and a target outlet temperature at the outlet of the preheating furnace;

[0061] Step S102, according to the initial flow value, adjusting the real-time flow value to be greater than or equal to the initial flow value;

[0062] Step S103, executing the preheating furnace control strategy according to the target flow value and the target outlet temperature, so that the real-time flow value is greater than or equal to the target flow value and the real-time outlet temperature is greater than or equal to the target outlet temperature.

[0063] Specifically, firstly, step S101 is executed to obtain the initial flow value, real-time flow value and target flow value of the inlet of the preheating furnace, and the real-time outlet temperature and target outlet temperature of the outlet of the preheating furnace.

[0064] Specifically, the initial flow value, target flow value and target outlet temperature are obtained by reading the configuration variable list, and the real-time flow value and real-time outlet temperature are obtained by collecting real-time data. The initial flow value refers to the target value of the natural gas feed amount of the preheating furnace at the initial stage of startup operation, and the real-time flow refers to the real-time flow value of the natural gas flow at the inlet of the preheating furnace, that is, the current natural gas feed amount. The preheating furnace specifically refers to the natural gas preheating furnace in the natural gas partial oxidation process for producing acetylene;

[0065] Then, step S102 is executed to adjust the preheating furnace inlet flow value according to the initial flow value so that the real-time flow value is greater than or equal to the initial flow value, so as to prevent the natural flow regulating valve from having poor adjustment effect at a small opening and ensure the smooth feeding of natural gas.

[0066] In some embodiments, according to the initial flow value, the preheating furnace inlet flow value is adjusted in manual mode so that the real-time flow value is greater than or equal to the initial flow value.

[0067] Then, step S103 is executed to set the preheating furnace synchronous flow rate and temperature increase strategy according to the target flow value and the target outlet temperature.

[0068] Specifically, step S103 is to simultaneously increase the natural gas load and the preheating furnace temperature. Each stage of increasing the quantity and temperature must meet the quantity increase target and the temperature increase target to enter the next stage, until the real-time flow value is greater than or equal to the target flow value and the real-time outlet temperature is greater than or equal to the target outlet temperature, so as to provide sufficient quantity and temperature of natural gas to the downstream.

[0069] The present invention adjusts the real-time flow value of the preheating furnace inlet flow to the set initial flow value in the initial stage, and then sets the preheating furnace synchronous increase and temperature raising strategy in stages according to the target flow value and the target outlet temperature, so that the real-time flow value is greater than or equal to the target flow value and the real-time outlet temperature is greater than or equal to the target outlet temperature. In this way, the inlet flow and outlet temperature are automatically and accurately adjusted to the target value quickly.

[0070] like Figure 2 The flowchart of a preheating furnace control method according to another embodiment of the present invention is shown, comprising:

[0071] Step S201, obtaining the initial flow value, real-time flow value and target flow value of the preheating furnace inlet, and the real-time outlet temperature and target outlet temperature of the preheating furnace outlet.

[0072] Specifically, the initial flow value at the preheating furnace inlet is obtained by reading the configuration variables. The initial flow value is the target flow of the natural gas feed flow controlled separately by the manual mode of the flow controller in the initial stage of the preheating furnace startup, in order to prevent the natural flow regulating valve from having poor adjustment effect at a small opening and to ensure the smooth natural gas feed; the real-time flow value at the preheating furnace inlet is obtained by real-time collection of the preheating furnace inlet flow. The real-time flow refers to the real-time flow value of the natural gas flow at the preheating furnace inlet, that is, the current natural gas feed amount. The preheating furnace specifically refers to the natural gas preheating furnace in the natural gas partial oxidation process for acetylene; the real-time outlet temperature of the preheating furnace outlet is obtained by real-time collection of the outlet temperature meter. The target flow value and target outlet temperature of the preheating furnace inlet are both obtained by reading the configuration variables. The target flow value refers to the natural gas feed amount that meets the production requirements, and the target outlet temperature refers to the temperature of the natural gas that meets the production requirements.

[0073] Step S202, adjusting the real-time flow value to be greater than or equal to the initial flow value according to the initial flow value, includes: setting an initial waiting time, an initial adjustment amount, and setting the flow controller to a first adjustment mode; in the first adjustment mode, adjusting the real-time flow value by increasing the initial adjustment amount at each interval of the initial waiting time until the real-time flow value is greater than or equal to the initial flow value.

[0074] Specifically, the initial stage is a separate volume increase process, which increases the actual value of natural gas flow from 0 to the initial flow value. This stage does not involve temperature adjustment. The actual value of natural gas flow is read through the distributed control system (DCS), and the natural gas flow increase process is achieved by manipulating the natural gas flow controller in the DCS system. The DCS system configuration is carried out according to the following logic. The initial stage volume increase process maintains the first adjustment mode of the flow controller, the purpose of which is to prevent the natural gas flow control valve from having poor adjustment effect at a small opening and to ensure smooth natural gas feed.

[0075] In some embodiments, the first adjustment mode is a manual mode.

[0076] Preferably, the flow controller is set to a first adjustment mode, specifically: the natural gas flow controller is set to a manual mode.

[0077] Step S203, the control strategy includes a first control strategy and a second control strategy, and the preheating furnace control strategy is executed according to the target flow value and the target outlet temperature, so that the real-time flow value is greater than or equal to the target flow value and the real-time outlet temperature is greater than or equal to the target outlet temperature, including: setting the flow controller to a second adjustment mode; obtaining a first flow value and a first outlet temperature of the preheating furnace, wherein the initial flow value is less than the first flow value, and the first flow value is less than the target flow value, and the first outlet temperature is less than the target outlet temperature; in the second adjustment mode: according to the first flow value and the first outlet temperature, executing the first control strategy and executing the temperature adjustment amount automatic correction strategy; according to the target flow value and the target outlet temperature, executing the second control strategy and executing the temperature adjustment amount automatic correction strategy.

[0078] Specifically, the first control strategy corresponds to the simultaneous increase in volume and temperature increase process in the first stage. The increase in volume in the first stage is to directly increase the real-time flow rate at the entrance of the preheating furnace to the first flow rate value through the second adjustment mode of the flow controller. In the first stage temperature increase strategy, the real-time outlet temperature is increased to the first outlet temperature. When the outlet temperature is greater than or equal to the first outlet temperature, it is necessary to start maintaining the outlet temperature always near the first outlet temperature. Every time interval, it is determined whether the outlet temperature is less than the first outlet temperature. If so, the real-time outlet temperature is increased by a set value through the output value of the temperature controller, so that the real-time outlet temperature is increased by a set value, so that the outlet temperature is always near the first outlet temperature. Until the real-time flow rate is greater than or equal to the first flow rate value, and the real-time outlet temperature is greater than or equal to the first outlet temperature, the first stage of the increase in volume and temperature increase process is ended, and the second stage of the increase in volume and temperature increase process is entered. The increase in volume process in the second stage is similar to the first stage. The real-time flow rate at the entrance of the preheating furnace is directly increased to the second flow rate value through the flow controller; the second stage temperature increase strategy is set according to the second outlet temperature; during the entire temperature increase process, the temperature adjustment amount automatic correction strategy is set to ensure the appropriate range of the change rate of the preheating furnace outlet temperature.

[0079] In some embodiments, the second adjustment mode is a manual mode.

[0080] Preferably, the flow controller is set to the second adjustment mode, specifically: the natural gas flow controller is set to the automatic mode.

[0081] In one embodiment, executing a first control strategy according to the first flow value and the first outlet temperature includes:

[0082] Setting a first flow waiting time and a first adjustment amount;

[0083] The real-time flow value is adjusted to increase by the first adjustment amount at each interval of the first flow waiting time, until the real-time flow value is greater than or equal to the first flow value.

[0084] Specifically, the first flow waiting time, the first adjustment amount and the real-time flow value are read through the DCS, and the natural gas flow increasing process is realized by manipulating the natural gas flow controller in the DCS system. The DCS system configuration is carried out according to the following logic: the natural gas flow controller is kept in automatic mode during the first stage of the increasing process, and the natural gas increasing process is realized by changing the natural gas flow setting value to the first adjustment amount.

[0085] In this embodiment, the natural gas flow rate setting value is set to the first adjustment amount, and the natural gas flow rate controller realizes the first stage flow rate control adjustment to the first adjustment amount.

[0086] In one embodiment, executing the first control strategy according to the first flow value and the first outlet temperature further includes:

[0087] Set the first temperature waiting time, the first heating rate interval minimum value, the first heating rate interval maximum value, the first outlet temperature increase and the first outlet temperature decrease, the second temperature waiting time and the first outlet temperature correction value;

[0088] Calculate the outlet temperature change rate;

[0089] At each interval of the first temperature waiting time, if the outlet temperature change rate is less than the minimum value of the first heating rate interval, the real-time outlet temperature is adjusted to increase by the first outlet temperature increase amount; if the outlet temperature change rate is greater than the maximum value of the first heating rate interval, the real-time outlet temperature is adjusted to decrease by the first outlet temperature decrease amount, until the real-time outlet temperature is greater than or equal to the first outlet temperature;

[0090] At each interval of the second temperature waiting time, if the real-time outlet temperature is less than the first outlet temperature, the real-time outlet temperature is adjusted to increase by the first outlet temperature correction amount until the real-time outlet temperature is greater than or equal to the first outlet temperature.

[0091] Specifically, the first temperature control strategy aims to raise the temperature to the first outlet temperature within the set temperature change rate range. Therefore, when the outlet temperature change rate is less than the minimum value of the first heating rate interval or greater than the maximum value of the first heating rate interval, the first outlet temperature addition amount or the first outlet temperature subtraction amount shall be added or subtracted accordingly; when the real-time outlet temperature is greater than or equal to the first outlet temperature, and the real-time flow rate is still less than the first flow rate value, it is necessary to set the real-time outlet temperature to be corrected once every time period so that the real-time outlet temperature remains near the first outlet temperature. The outlet temperature change rate control during the heating process is achieved by changing the output of the natural gas preheating furnace outlet temperature controller, that is, the opening of the fuel gas regulating valve.

[0092] This embodiment implements the first temperature control strategy.

[0093] In one embodiment, the calculating the outlet temperature change rate comprises:

[0094] Obtain the actual value of the outlet temperature at the rate interval time and the time point backwards of the rate interval time;

[0095] The outlet temperature change rate is calculated as:

[0096]

[0097] Among them, R ais the outlet temperature change rate, T N is the real-time outlet temperature, T B is the actual value of the outlet temperature, and Δt is the rate interval time.

[0098] Specifically, calculate the actual rate of change R of the preheating furnace outlet temperature within a period of time Δt a The value of Δt is obtained by dividing the difference in actual temperature before and after a period of time Δt by the length of this period of time, and the real-time rate of temperature change within this period of time Δt is obtained.

[0099] This embodiment calculates the real-time temperature change rate of the front and rear temperatures within a given time.

[0100] In one embodiment, executing the second control strategy according to the target flow value and the target outlet temperature includes:

[0101] Setting a second flow waiting time and a second adjustment amount;

[0102] The real-time flow value is adjusted to increase by the second adjustment amount at each interval of the second flow waiting time until the real-time flow value is greater than or equal to the target flow value.

[0103] Specifically, the second flow waiting time, the second adjustment amount and the real-time flow value are read through the DCS, and the natural gas flow increasing process is realized by manipulating the natural gas flow controller in the DCS system. The DCS system configuration is carried out according to the following logic: the second stage of the volume increase process keeps the natural gas flow controller in automatic mode, and the natural gas volume increase process is realized by changing the natural gas flow set value to the second adjustment amount.

[0104] In this embodiment, the natural gas flow rate setting value is set to the second adjustment amount, and the natural gas flow rate controller realizes the second stage flow rate control adjustment to the second adjustment amount.

[0105] In one embodiment, executing the second control strategy according to the target flow value and the target outlet temperature further includes:

[0106] Setting a third temperature waiting time, a second heating rate interval minimum value, a second heating rate interval maximum value, a second outlet temperature increment, and a second outlet temperature decrement, wherein the first outlet temperature is less than the target outlet temperature;

[0107] At each interval of the third temperature waiting time, if the outlet temperature change rate is less than the minimum value of the second heating rate interval, the real-time outlet temperature is adjusted to increase by the second outlet temperature increase amount; if the outlet temperature change rate is greater than the maximum value of the second heating rate interval, the real-time outlet temperature is adjusted to decrease by the second outlet temperature decrease amount, until the real-time outlet temperature is greater than or equal to the average value of the first outlet temperature and the target outlet temperature;

[0108] Set the fourth temperature waiting time, the third heating rate interval minimum value, the third heating rate interval maximum value, the third outlet temperature increase and the third outlet temperature decrease, wherein the third heating rate interval minimum value is less than the second heating rate interval minimum value, and the third heating rate interval maximum value is less than the second heating rate interval maximum value;

[0109] At each interval of the fourth temperature waiting time, if the outlet temperature change rate is less than the minimum value of the third heating rate interval, the real-time outlet temperature is adjusted to increase the third outlet temperature increase; if the outlet temperature change rate is greater than the maximum value of the third heating rate interval, the real-time outlet temperature is reduced by the third outlet temperature decrement until the real-time outlet temperature is greater than or equal to the target outlet temperature.

[0110] Specifically, during the second stage of heating, two different outlet temperature change rate strategies are used. When the real-time outlet temperature is less than the average value of the first outlet temperature and the target temperature, the outlet temperature change rate is judged to be less than the minimum value of the second heating rate interval at each interval of the third temperature waiting time, and the real-time outlet temperature is added with a second outlet temperature increment. If the outlet temperature change rate is greater than the maximum value of the second heating rate interval, the real-time outlet temperature is reduced by the second outlet temperature decrement until the real-time outlet temperature is greater than or equal to the average value of the first outlet temperature and the target outlet temperature. When the real-time outlet temperature is greater than or equal to the average value of the first outlet temperature and the target temperature, the outlet temperature change rate is judged to be less than the minimum value of the third heating rate interval at each interval of the fourth temperature waiting time, and the outlet temperature change rate is judged to be less than the minimum value of the third heating rate interval, and the real-time outlet temperature is added with a third outlet temperature increment. If the outlet temperature change rate is greater than the maximum value of the third heating rate interval, the real-time outlet temperature is reduced by a third outlet temperature decrement until the real-time outlet temperature is greater than or equal to the target outlet temperature. The minimum value of the third heating rate interval < the minimum value of the second heating rate interval, and the maximum value of the third heating rate interval < the maximum value of the second heating rate interval.

[0111] This embodiment sets a second temperature control strategy to increase the real-time outlet temperature to the target outlet temperature at different rates.

[0112] In one embodiment, the step of executing the temperature adjustment amount automatic correction strategy includes:

[0113] Set the time interval, the minimum value of the outlet temperature change rate suitable interval, and the maximum value of the outlet temperature change rate suitable interval;

[0114] Obtaining an outlet temperature adjustment amount and an average value of the outlet temperature change rate within the time interval, wherein the outlet temperature adjustment amount includes a first outlet temperature increase, a first outlet temperature decrease, a second outlet temperature increase, a second outlet temperature decrease, a third outlet temperature increase, and a third outlet temperature decrease;

[0115] When the average value of the outlet temperature change rate is less than the minimum value of the outlet temperature change rate suitable interval, the outlet temperature adjustment amount is adjusted as follows:

[0116] X=A×X

[0117] When the average value of the outlet temperature change rate is greater than the maximum value of the outlet temperature change rate suitable interval, the outlet temperature adjustment amount is adjusted as follows:

[0118] X=B×X

[0119] Wherein, X is the outlet temperature adjustment amount, A is a first constant greater than 1, and B is a second constant less than 1.

[0120] Specifically, the outlet temperature change rate suitable interval refers to the outlet heating rate range that meets the production requirements. During the entire process of adjusting the temperature, in order to ensure that the real-time outlet temperature change rate is within the outlet temperature change rate suitable interval, a time interval is set to determine whether the average value of the outlet temperature change rate within this time interval is within the outlet temperature change rate suitable interval. If the average value of the outlet temperature change rate is less than the minimum value of the outlet temperature change rate suitable interval, it indicates that the real-time outlet temperature change rate is too low at this time, and the outlet temperature adjustment amount needs to be expanded to A times the current adjustment amount, and A can be selected as 1.1; if the average value of the outlet temperature change rate is greater than the maximum value of the outlet temperature change rate suitable interval, it indicates that the current real-time outlet temperature change rate is too high, and the outlet temperature adjustment amount needs to be reduced to B times the current adjustment amount, and B can be selected as 0.9. In this way, automatic correction is achieved to ensure that the outlet temperature change rate is within the outlet temperature change rate suitable interval.

[0121] This embodiment realizes automatic correction of the outlet temperature change rate to ensure that the outlet temperature change rate is within a suitable range of the outlet temperature change rate.

[0122] The present invention adjusts the flow rate of the preheating furnace to the set initial value in the initial stage, and then increases the temperature synchronously, realizing the increase of flow rate and temperature synchronously in stages. At the same time, in order to ensure that the outlet temperature change rate is within the appropriate range during the temperature increase process, the outlet temperature adjustment amount is automatically corrected according to the set time interval each time interval, ensuring that each temperature adjustment is not too small or too large, so that the outlet temperature change rate is always within the appropriate range and adjusted steadily. Thereby, the inlet flow rate and outlet temperature are automatically and accurately adjusted to the target value quickly.

[0123] Preferred Embodiments

[0124] This embodiment provides an automatic program design method applicable to the temperature increase and quantity increase process of the natural gas preheating furnace of an acetylene plant. Figure 3 This is a flow chart of automatic control of increasing volume and temperature in a preferred embodiment of the present invention. The automatic program design method may include step S301, step S302, step S303, step S304 and step S305.

[0125] S301, the initial stage of increasing the flow rate, increasing the real-time flow value of natural gas from 0 to the initial flow value F1;

[0126] The real-time flow value of natural gas is read through the DCS system, and the natural gas flow increase process is achieved by manipulating the natural gas flow controller in the DCS system. The DCS system configuration is carried out according to the following logic. Figure 4 The figure shows a logic diagram of the initial stage volume increase process in a preferred embodiment of the present invention. In the initial stage volume increase process, the natural gas flow controller is kept in manual mode in step S401, which is intended to prevent the natural flow control valve from having poor adjustment effect at a small opening. In step S402, the real-time flow value is increased by an initial adjustment amount at each initial waiting time until the real-time flow value is greater than or equal to the initial flow value.

[0127] S302, the first stage of increasing the flow rate, increasing the real-time flow value of natural gas from the initial flow value F1 to the first flow value F2;

[0128] The natural gas flow set value and actual value are read through the DCS system. The natural gas flow increase process is achieved by manipulating the natural gas flow controller in the DCS system. The DCS system configuration is carried out according to the following logic. Figure 5 The logical diagram of the volume increase process in the preferred embodiment of the present invention is shown. In the first stage of the volume increase process, the natural gas flow controller is kept in automatic mode in step S501, and the natural gas volume increase process is achieved by changing the natural gas flow setting value. In step S502, the real-time flow value is increased by a set adjustment amount at each interval of a waiting set time, until the real-time flow value is greater than or equal to the set flow value of this stage.

[0129] S303, the second stage of increasing the flow rate, increasing the real-time flow value of natural gas from the first flow value F2 to the target flow value F3;

[0130] The natural gas flow set value and actual value are read through the DCS system. The natural gas flow increase process is realized by manipulating the natural gas flow controller in the DCS system. The DCS system configuration is carried out according to the following logic. In the second stage of the increase process, the natural gas flow controller is kept in automatic mode, and the natural gas increase process is realized by changing the natural gas flow set value.

[0131] Step S304, the first stage of heating process, raising the real-time outlet temperature of the natural gas preheating furnace from the ambient temperature to the first outlet temperature T1;

[0132] The real-time outlet temperature of the natural gas preheating furnace is read through the DCS system, and the temperature rise process is realized by manipulating the natural gas preheating furnace outlet temperature controller in the DCS system. The DCS system configuration is carried out according to the following logic. Figure 6 The figure shows the logic diagram of the heating process in the preferred embodiment of the present invention. In the first stage of the heating process, the natural gas flow controller of step S601 is kept in manual mode, and the rate control of the heating process is achieved by changing the output of the natural gas preheating furnace outlet temperature controller, that is, the opening of the fuel gas regulating valve. In step S602, at each interval of a waiting set time, the temperature controller outputs the adjustment amount to check whether the real-time outlet temperature is greater than or equal to the set outlet temperature of this stage.

[0133] According to a preferred embodiment of the present invention, a first-stage heating preheating furnace outlet temperature controller output value adjustment strategy is provided, and the first-stage heating preheating furnace outlet temperature controller output value adjustment strategy may include: heating stage one step one, heating stage two step two and heating stage three step three.

[0134] In the first stage of heating, step 1, the outlet temperature change rate Ra of the preheating furnace outlet temperature is detected at the first temperature waiting time ta. Preferably, ta is about 30 seconds. The current value of the real-time outlet temperature of the preheating furnace T N By referencing the parameters in the DCS database, the outlet temperature change rate Ra of the preheating furnace outlet temperature within a period of time ta is realized by the first and second configuration function blocks. The first function block references the current temperature parameters in the DCS database. The first configuration function block sets a certain lag time. The referenced current temperature is output after a period of time. The calculation process is realized in the second configuration function block according to the formula:

[0135]

[0136] Where Ra is the rate of change of the outlet temperature of the preheating furnace, T N is the real-time temperature at the outlet of the preheating furnace, T Bis the actual value of the preheating furnace outlet temperature before the rate interval time, and Δt is the rate interval time.

[0137] Step 2 of the first stage of heating is to determine whether the heating rate of the outlet temperature of the preheating furnace meets the preset conditions. Set the appropriate range of the change rate of the outlet temperature of the preheating furnace [R min , R max ], the rate of change of the preheating furnace outlet temperature Ra is less than R min Or the actual heating rate of the reactor Ra is greater than R max It is considered that the temperature rise rate of the preheating furnace outlet does not meet the requirements. If the actual temperature rise rate of the reactor is within the appropriate range, the current temperature rise rate of the reactor meets the requirements.

[0138] Step 3 of the first stage of heating is to change the output value of the preheating furnace outlet temperature controller. According to the change rate of the preheating furnace outlet temperature and the suitable range of the change rate of the outlet temperature [R min , R max ], when the trigger condition is met, the output value of the preheating furnace outlet temperature controller is acted upon, and the trigger conditions and their corresponding actions are shown in Table 1 below:

[0139] Table 1

[0140] Trigger conditions action <![CDATA[R a <R min ]]> <![CDATA[out=out+x1]]> <![CDATA[R a >R max ]]> <![CDATA[out=out-x2]]> <![CDATA[R a >R min And R a <R max ]]> out=out+0

[0141] According to a preferred embodiment of the present invention, a design method for a sub-sequential control program is provided to maintain the outlet temperature of the natural gas preheating furnace always near T1 after the first stage of heating process. When the outlet temperature of the natural gas preheating furnace reaches T1, the sub-sequential control is automatically started. After starting, it is judged whether the outlet temperature of the preheating furnace is lower than T1 every second temperature waiting time tb. Preferably, tb is about 30 seconds. If it is lower than T1, the output value of the preheating furnace outlet temperature controller increases by x3.

[0142] Step S305, the second stage of heating process, raising the actual value of the natural gas preheating furnace outlet temperature from T1 to the target outlet temperature T2;

[0143] The actual value of the natural gas preheating furnace outlet temperature is read through the DCS system, and the heating process is realized by manipulating the natural gas preheating furnace outlet temperature controller in the DCS system. In the second stage of heating process, the natural gas flow controller is kept in manual mode, and the heating process rate control is realized by changing the output value of the natural gas preheating furnace outlet temperature controller, that is, the opening of the fuel gas regulating valve.

[0144] According to a preferred embodiment of the present invention, a strategy for adjusting the output value of the preheating furnace outlet temperature controller during the second stage heating process is provided. The strategy for adjusting the output value of the preheating furnace outlet temperature controller during the second stage heating process may include: heating stage two step one, heating stage two step two and heating stage two step three.

[0145] The first step of the second stage of heating is to detect the actual change rate Ra of the outlet temperature of the preheating furnace at the first temperature waiting time ta. Preferably, ta is about 30 seconds. The current value of the outlet temperature of the preheating furnace T N By referencing the parameters in the DCS database, the Ra of the preheating furnace outlet temperature within the time ta is realized by the first and second configuration function blocks. The first function block references the current temperature parameters in the DCS database. The first configuration function block sets a certain lag time. The referenced current temperature is output after a period of time. The calculation process is realized in the second configuration function block according to the formula:

[0146]

[0147] Where Ra is the rate of change of the outlet temperature of the preheating furnace, T N is the real-time temperature at the outlet of the preheating furnace, T B is the actual value of the preheating furnace outlet temperature before the rate interval time, and Δt is the rate interval time.

[0148] Step 2 of the second stage of heating is to determine whether the rate of change of the outlet temperature of the preheating furnace meets the preset conditions. Set the appropriate range of the rate of change of the outlet temperature of the preheating furnace [R′ min , R′ max ], the actual change rate of the preheating furnace outlet temperature Ra is less than R' min Or the actual heating rate of the reactor Ra is greater than R' max It is considered that the temperature rise rate of the preheating furnace outlet does not meet the requirements. If the actual temperature rise rate of the reactor is within the appropriate range, the current temperature rise rate of the reactor meets the requirements.

[0149] Step 3 of the second stage of heating is to change the output value of the preheating furnace outlet temperature controller. According to the change rate of the preheating furnace outlet temperature and the appropriate range of the temperature change rate [R′ min , R′ max ], when the trigger condition is met, the output value of the preheating furnace outlet temperature controller is acted upon, and the trigger condition and its corresponding action are shown in Table 2 below:

[0150] Table 2

[0151] Trigger conditions action <![CDATA[R a <R′ min ]]> <![CDATA[out=out+x′1]]> <![CDATA[R a >R′ max ]]> <![CDATA[out=out-x′2]]> <![CDATA[R a >R′ min And R a <R′ max ]]> out=out+0

[0152] When the outlet temperature of the preheating furnace reaches The program automatically adjusts the output value adjustment strategy of the preheating furnace outlet temperature controller during the second stage of heating process, and sets the appropriate range of the preheating furnace outlet temperature change rate [R min , R″ max ], where R″ min <R′ min , R″ max <R′max According to the change rate of the outlet temperature of the preheating furnace and the suitable range of the temperature change rate [R min , R″ max ], when the trigger condition is met, the output value of the preheating furnace outlet temperature controller is acted upon, and the trigger condition and its corresponding action are shown in Table 3 below:

[0153] Table 3

[0154] Trigger conditions action <![CDATA[R a <R″ min ]]> <![CDATA[out=out+x″1]]> <![CDATA[R a >R″ max ]]> <![CDATA[out=out-x″2]]> <![CDATA[R a >R″ min And R a <R″ max ]]> out=out+0

[0155] When the outlet temperature of the preheating furnace rises to the target temperature T2, the second stage heating process ends. When the outlet temperature of the preheating furnace rises to the target temperature T2 and the natural gas flow rate rises to the target flow rate F3, the preheating furnace heating and flow rate increase process ends and all programs end.

[0156] According to a preferred embodiment of the present invention, an automatic adjustment amount correction module is provided, which sets the appropriate range of the change rate of the outlet temperature of the preheating furnace according to each heating stage. min , R max ] and the average value of the change rate of the outlet temperature of the preheating furnace within the time interval tc R c The relationship between the output value adjustment amount x of the preheating furnace outlet temperature is adjusted, as shown in Table 4. Preferably, tc is about 10 minutes, until the preheating furnace outlet temperature rises to T2, and the automatic correction function of the adjustment amount stops running.

[0157] Table 4

[0158] Trigger conditions action <![CDATA[R c <R min ]]> x=1.1x <![CDATA[R c <R max And R c >R min ]]> Adjustment amount x remains unchanged <![CDATA[R c >R min ]]> x=0.9x

[0159] like Figure 7 The figure shows a hardware structure diagram of an electronic device of the present invention, including:

[0160] at least one processor 701; and,

[0161] A memory 702 that is communicatively connected to at least one of the processors 701; wherein,

[0162] The memory 702 stores instructions that can be executed by at least one of the processors. The instructions are executed by at least one of the processors so that the at least one of the processors can execute the preheating furnace control method as described above.

[0163] Figure 7 A processor 701 is taken as an example.

[0164] The electronic device may further include: an input device 703 and a display device 704 .

[0165] The processor 701, the memory 702, the input device 703 and the display device 704 may be connected via a bus or other means, and the figure takes the connection via a bus as an example.

[0166] The memory 702 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules corresponding to the preheating furnace control method in the embodiment of the present application, for example, Figure 1 , Figure 2 , Figure 3 The processor 701 executes various functional applications and data processing by running the non-volatile software programs, instructions and modules stored in the memory 702, that is, the preheating furnace control method in the above embodiment is implemented.

[0167] The memory 702 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required by at least one function; the data storage area may store data created according to the use of the preheating furnace control method, etc. In addition, the memory 702 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 702 may optionally include a memory remotely arranged relative to the processor 701, and these remote memories may be connected to the device for executing the preheating furnace control method via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0168] The input device 703 can receive user clicks and generate signal inputs related to user settings and function controls of the preheating furnace control method. The display device 704 can include display devices such as a display screen.

[0169] The one or more modules are stored in the memory 702, and when executed by the one or more processors 701, the preheating furnace control method in any of the above method embodiments is executed.

[0170] The present invention adjusts the flow rate of the preheating furnace to the initial flow rate value in the initial stage, and then increases the flow rate and temperature synchronously in stages. At the same time, in order to ensure that the outlet temperature change rate is within the appropriate range during the temperature increase process, the outlet temperature adjustment amount is automatically corrected at each set time interval to ensure that the temperature adjustment is not too small or too large each time, so that the outlet temperature change rate is always within the appropriate range and adjusted steadily. Thereby, the inlet flow rate and outlet temperature are automatically and accurately adjusted to the target value quickly.

[0171] An embodiment of the present invention provides a storage medium, wherein the storage medium stores computer instructions. When a computer executes the computer instructions, the storage medium is used to execute all steps of the preheating furnace control method as described above.

[0172] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A preheating furnace control method, characterized in that: include: Obtaining the initial flow value, real-time flow value and target flow value of the preheating furnace inlet, and the real-time outlet temperature and target outlet temperature of the preheating furnace outlet; According to the initial flow value, adjusting the real-time flow value to be greater than or equal to the initial flow value; According to the target flow value and the target outlet temperature, a preheating furnace control strategy is executed so that the real-time flow value is greater than or equal to the target flow value and the real-time outlet temperature is greater than or equal to the target outlet temperature.

2. The preheating furnace control method according to claim 1, characterized in that: The step of adjusting the real-time flow value to be greater than or equal to the initial flow value according to the initial flow value includes: Setting the initial waiting time, the initial adjustment amount, and setting the flow controller to the first adjustment mode; In the first adjustment mode, the real-time flow value is adjusted to increase by the initial adjustment amount at each interval of the initial waiting time until the real-time flow value is greater than or equal to the initial flow value.

3. The preheating furnace control method according to claim 1, characterized in that: The control strategy includes a first control strategy and a second control strategy, and the preheating furnace control strategy is executed according to the target flow value and the target outlet temperature, so that the real-time flow value is greater than or equal to the target flow value and the real-time outlet temperature is greater than or equal to the target outlet temperature, including: Set the flow controller to the second adjustment mode; Acquire a first flow value and a first outlet temperature of the preheating furnace, wherein the initial flow value is less than the first flow value, and the first flow value is less than the target flow value, and the first outlet temperature is less than the target outlet temperature; In the second adjustment mode: Executing a first control strategy and an automatic temperature adjustment correction strategy according to the first flow value and the first outlet temperature; According to the target flow value and the target outlet temperature, a second control strategy and an automatic temperature adjustment amount correction strategy are executed.

4. The preheating furnace control method according to claim 3, characterized in that: The executing a first control strategy according to the first flow value and the first outlet temperature comprises: Setting a first flow waiting time and a first adjustment amount; The real-time flow value is adjusted to increase by the first adjustment amount at each interval of the first flow waiting time, until the real-time flow value is greater than or equal to the first flow value.

5. The preheating furnace control method according to claim 3, characterized in that: The executing a first control strategy according to the first flow value and the first outlet temperature further comprises: Set the first temperature waiting time, the first heating rate interval minimum value, the first heating rate interval maximum value, the first outlet temperature increase and the first outlet temperature decrease, the second temperature waiting time and the first outlet temperature correction value; Calculate the outlet temperature change rate; At each interval of the first temperature waiting time, if the outlet temperature change rate is less than the minimum value of the first heating rate interval, the real-time outlet temperature is adjusted to increase by the first outlet temperature increase amount; if the outlet temperature change rate is greater than the maximum value of the first heating rate interval, the real-time outlet temperature is adjusted to decrease by the first outlet temperature decrease amount, until the real-time outlet temperature is greater than or equal to the first outlet temperature; At each interval of the second temperature waiting time, if the real-time outlet temperature is less than the first outlet temperature, the real-time outlet temperature is adjusted to increase by the first outlet temperature correction amount until the real-time outlet temperature is greater than or equal to the first outlet temperature.

6. The preheating furnace control method according to claim 5, characterized in that: The calculating the outlet temperature change rate comprises: Obtain the actual value of the outlet temperature at the rate interval time and the time point backwards of the rate interval time; The outlet temperature change rate is calculated as: Among them, R a is the outlet temperature change rate, T N is the real-time outlet temperature, T B is the actual value of the outlet temperature, and Δt is the rate interval time.

7. The preheating furnace control method according to claim 3, characterized in that: The executing a second control strategy according to the target flow value and the target outlet temperature comprises: Setting a second flow waiting time and a second adjustment amount; The real-time flow value is adjusted to increase by the second adjustment amount at each interval of the second flow waiting time until the real-time flow value is greater than or equal to the target flow value.

8. The preheating furnace control method according to claim 3, characterized in that: The executing a second control strategy according to the target flow value and the target outlet temperature further comprises: Setting a third temperature waiting time, a second heating rate interval minimum value, a second heating rate interval maximum value, a second outlet temperature increment, and a second outlet temperature decrement, wherein the first outlet temperature is less than the target outlet temperature; At each interval of the third temperature waiting time, if the outlet temperature change rate is less than the minimum value of the second heating rate interval, the real-time outlet temperature is adjusted to increase by the second outlet temperature increase amount; if the outlet temperature change rate is greater than the maximum value of the second heating rate interval, the real-time outlet temperature is adjusted to decrease by the second outlet temperature decrease amount, until the real-time outlet temperature is greater than or equal to the average value of the first outlet temperature and the target outlet temperature; Set the fourth temperature waiting time, the third heating rate interval minimum value, the third heating rate interval maximum value, the third outlet temperature increase and the third outlet temperature decrease, wherein the third heating rate interval minimum value is less than the second heating rate interval minimum value, and the third heating rate interval maximum value is less than the second heating rate interval maximum value; At each interval of the fourth temperature waiting time, if the outlet temperature change rate is less than the minimum value of the third heating rate interval, the real-time outlet temperature is adjusted to increase the third outlet temperature increase; if the outlet temperature change rate is greater than the maximum value of the third heating rate interval, the real-time outlet temperature is reduced by the third outlet temperature decrement until the real-time outlet temperature is greater than or equal to the target outlet temperature.

9. The preheating furnace control method according to claim 3, characterized in that: The automatic correction strategy for executing the temperature adjustment amount includes: Set the time interval, the minimum value of the outlet temperature change rate suitable interval, and the maximum value of the outlet temperature change rate suitable interval; Obtaining an outlet temperature adjustment amount and an average value of the outlet temperature change rate within the time interval, wherein the outlet temperature adjustment amount includes a first outlet temperature increase, a first outlet temperature decrease, a second outlet temperature increase, a second outlet temperature decrease, a third outlet temperature increase, and a third outlet temperature decrease; When the average value of the outlet temperature change rate is less than the minimum value of the outlet temperature change rate suitable interval, the outlet temperature adjustment amount is adjusted as follows: X=A×X When the average value of the outlet temperature change rate is greater than the maximum value of the outlet temperature change rate suitable interval, the outlet temperature adjustment amount is adjusted as follows: X=B×X Wherein, X is the outlet temperature adjustment amount, A is a first constant greater than 1, and B is a second constant less than 1.

10. An electronic device, characterized in that: include: at least one processor; as well as, a memory communicatively connected to at least one of the processors; wherein, The memory stores instructions that can be executed by at least one of the processors, and the instructions are executed by at least one of the processors to enable at least one of the processors to execute the preheating furnace control method according to any one of claims 1 to 9.

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