阅读说明：本技术 一种加热炉的温度控制方法 (Temperature control method of heating furnace ) 是由 叶金虎 杨超华 严森泉 姚忠 赖明� 徐乔 赵锋 钱杰泳 于 2021-09-03 设计创作，主要内容包括：本发明公开了一种加热炉的温度控制方法,包括在检测模块设置第一预设条件Def1：t-t-(0)＜X,若达到所述Def1则温度控制模块设置升温因子并发送信号至PLC控制模块,所述PLC控制模块通过电压调节模块控制加热模块的加热功率以调控所述加热模块的升温因子,所述温度检测模块继续判断是否达到所述Def1,若否,温度控制模块将升温因子设置为0,并发送信号至PLC控制模块。本发明通过温度控制模块实现对升温因子的柔性控制,使温度可以快速平稳地到达目标值,由动态过程进入到稳态过程,并能有效降低加热炉温度控制系统的超调量。(The invention discloses a temperature control method of a heating furnace, which comprises the following steps that a first preset condition Def1 is set in a detection module: t-t 0 < X, if said Def1 is reached, the temperature control module sets a temperature raising factor And sending a signal to a PLC control module, wherein the PLC control module controls the heating power of the heating module through a voltage regulation module so as to regulate and control the heating factor of the heating module, the temperature detection module continuously judges whether the Def1 is reached, if not, the temperature control module sets the heating factor to be 0 and sends the signal to the PLC control module. The invention realizes the flexible control of the temperature-rising factor through the temperature control module, so that the temperature can quickly and stably reach a target value, the dynamic process enters the steady-state process, and the overshoot of the temperature control system of the heating furnace can be effectively reduced.)

1. A temperature control method of a heating furnace is characterized by comprising the following steps:

step one, setting a target temperature t₀Starting a heating switch, and acquiring the temperature t in the furnace by a temperature detection module;

step two, the temperature control module sends the information according to the temperature detection moduleThe temperature t in the furnace is sent, the temperature is increased due to the arrangementAnd sending a temperature-rise factor Y signal to the PLC control module, wherein X is a fluctuation constant of the heating temperature, and k is_cThe temperature rise coefficient is expressed and is related to the specific heat capacity of the sample;

converting the received heating factor Y signal into an analog signal by the PLC control module, and transmitting the analog signal to a voltage adjusting module, wherein the voltage adjusting module controls the heating power of a heating module to regulate and control the heating speed of the heating module;

step four, when the temperature control module judges that t is more than or equal to t₀+ X, the temperature control module sets the temperature-rise factor Y to 0 and sends the temperature-rise factor Y signal to the PLC control module.

2. The temperature control method of a heating furnace according to claim 1, wherein when the temperature t in the furnace satisfies t > t₀X, setting the sampling period of the temperature T in the furnace to be T₁(ii) a If not, setting the sampling period as T₂And T is₁＜T₂。

3. The temperature control method of a heating furnace according to claim 2, wherein when t ═ t, t is measured₀Then sending a timing enable signal to the PLC control module, starting timing, and the timing time reaches T₃The heating switch is turned off.

4. The temperature control method of a heating furnace according to claim 1, wherein the fluctuation constant X of the heating temperature is 5 ℃.

5. The temperature control method of a heating furnace according to claim 1, wherein said temperature detecting means is a thermocouple sensor.

Technical Field

The invention relates to the technical field of heating, in particular to a temperature control method of a heating furnace.

Background

The existing heating control method mainly adopts a temperature controller to directly control an alternating current contactor to drive a heater, adopts the temperature controller to output analog quantity to drive a phase-shifting trigger controller, and further controls a three-phase silicon controlled rectifier to drive the heater. The output power of the heater cannot be smoothly adjusted, the heater is heated at full power or is stopped to heat, namely, the heating power cannot be quantitatively adjusted, so that the temperature control is not accurate, the temperature in the furnace is easily overhigh, and the energy consumption is overlarge.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a temperature control method of a heating furnace, which utilizes a temperature control module to realize quantitative regulation of heating power so as to enable the temperature to reach the target temperature quickly and stably.

6. In order to achieve the purpose, the invention provides the following technical scheme: a temperature control method of a heating furnace is characterized by comprising the following steps:

step one, setting a target temperature t₀Starting a heating switch, and acquiring the temperature t in the furnace by a temperature detection module;

step two, the temperature control module sets a temperature rise factor according to the temperature t in the furnace sent by the temperature detection moduleAnd sending a temperature-rise factor Y signal to the PLC control module, wherein X is the wave of the heating temperatureDynamic constant, k_cThe temperature rise coefficient is expressed and is related to the specific heat capacity of the sample;

converting the received heating factor Y signal into an analog signal by the PLC control module, and transmitting the analog signal to a voltage adjusting module, wherein the voltage adjusting module controls the heating power of a heating module to regulate and control the heating speed of the heating module;

step four, when the temperature control module judges that t is more than or equal to t₀+ X, the temperature control module sets the temperature-rise factor Y to 0 and sends the temperature-rise factor Y signal to the PLC control module.

More specifically, in the above technical scheme, when the temperature t in the furnace satisfies t > t₀X, setting the sampling period of the temperature T in the furnace to be T₁(ii) a If not, setting the sampling period as T₂And T is₁＜T₂。

More specifically, in the above technical solution, when t is equal to t₀Then sending a timing enable signal to the PLC control module, starting timing, and the timing time reaches T₃The heating switch is turned off.

More specifically, in the above technical solution, the fluctuation constant X of the heating temperature is 5 ℃.

More specifically, in the above technical solution, the temperature detection module is a thermocouple sensor.

Compared with the prior art, the invention has the beneficial effects that: the invention provides a temperature control method of a heating furnace, which sets a temperature rise regulation equation through a temperature control module to further realize the control of the power of a heating device and finally realize the flexible control of a temperature rise factor₀The increase speed of the former temperature-raising factor is slowly reduced, and the temperature t in the furnace reaches 80 percent t₀Then the temperature-rising factor begins to slowly fall, if the temperature t in the furnace is detected to be more than t₀And at the actual temperature t and the target temperature t₀Before the temperature difference reaches the fluctuation constant of the heating temperature of the sample, the temperature in the furnace is increased by a factorIs slowly reduced at the actual temperature t and the target temperature t₀After the temperature difference reaches the fluctuation constant of the heating temperature of the sample, the temperature rise factor is set to be 0, the method can effectively reduce the overshoot of the temperature control system, avoid the situation of overhigh temperature in the furnace, reduce the energy consumption by utilizing the method of adjusting the temperature rise speed, save the energy, automatically adjust and control by adopting a PLC control module, and has higher control precision.

Drawings

FIG. 1 is a flow chart of temperature control according to the present invention;

Detailed Description

In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments. Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control. Unless otherwise specifically stated, various apparatuses and the like used in the present invention can be commercially available from the field or can be prepared by an existing method.

Referring to fig. 1, a method for controlling the temperature of a heating furnace includes the following steps:

step one, setting a target temperature t₀Starting a heating switch, and acquiring the temperature t in the furnace by a temperature detection module;

step two, the temperature control module sets a temperature rise factor according to the temperature t in the furnace sent by the temperature detection moduleAnd sending a temperature-rise factor Y signal to the PLC control module, wherein X is the fluctuation of the heating temperatureAmount, k_cThe temperature rise coefficient is expressed and is related to the specific heat capacity of the sample;

converting the received heating factor Y signal into an analog signal by the PLC control module, and transmitting the analog signal to the voltage adjusting module, wherein the voltage adjusting module controls the heating power of the heating module to regulate and control the heating speed of the heating module;

step four, when the temperature control module judges that t is more than or equal to t₀+ X, the temperature control module sets the temperature-rise factor Y to 0 and sends the temperature-rise factor Y signal to the PLC control module.

The temperature-rising factor is used for influencing the temperature-rising speed, and the PLC control module adjusts the heating power according to the temperature-rising factor, so that the temperature-rising speed of the furnace temperature has the same trend with the temperature-rising factor. The invention aims to research how to set the temperature rising factor to realize the trend of high-efficiency and quick temperature rising. After obtaining the temperature-increasing factor, the PLC control module converts the received signal into a control signal, and the control signal is used for controlling the power supplied to the heating module.

Temperature detection module settings Def 1: t-t₀The maximum temperature in the heating furnace can be controlled by less than X, and the phenomenon that the performance of a sample is damaged due to overhigh temperature, t-t₀When > X, temperature detection module sends temperature information to temperature control module, and temperature control module converts temperature information to corresponding current signal and sends to PLC control module again, and PLC control module converts received signal to analog signal to send voltage control module to, voltage control module sets up heating module's heating power to 0, prevents that the stove internal temperature is too high.

t-t₀When the temperature is less than X, the temperature control module sets a temperature rise factor according to the temperature information sent by the temperature detection moduleAnd sends a signal to the PLC control module, k_cRepresenting the temperature rise coefficient, k is related to the specific heat capacity of the sample, and because the sample with large specific heat capacity indicates that the substance needs to absorb more heat when the temperature rises by 1 ℃, the substance needs to absorb heat for a longer time and can alternatively,the larger the specific heat capacity of the heated sample, the higher the temperature coefficient k is in order to reach the target temperature quickly_cThe larger, i.e. the larger the specific heat capacity, the larger k_cThe larger the temperature rise factor Y, the larger. If the heated sample can slowly reach the target temperature, the smaller the temperature increase coefficient k, the smaller the temperature increase factor Y in the heating furnace.

The temperature t in the furnace reaches 0.8t₀The front temperature rise factor Y is continuously increased, k_c×(t₀-t) is reduced along with the increase of the temperature, namely the increasing speed of the temperature increasing factor Y in the furnace is continuously reduced, and when t is 0.8t₀The increasing speed of the temperature-rising factor Y reaches the minimum value, and the temperature-rising factor Y reaches the maximum value; t is more than 0.8t₀At the same time, as the temperature t in the furnace increasesSlow down, t and t₀When the temperature difference is large, the reduction speed of the temperature rise factor Y is faster, and the reduction speed of the temperature rise factor Y is slower when t is closer to t 0; if the temperature t in the furnace is detected to be more than t₀And at the actual temperature t and the target temperature t₀Before the temperature difference reaches the fluctuation constant of the heating temperature of the sample, the temperature rise factor in the furnace is YIs slowly reduced at the actual temperature t and the target temperature t₀After the temperature difference reaches the fluctuation constant of the heating temperature of the sample, the temperature rise factor is set to be 0, the method realizes the flexible control of the temperature rise factor, so that the temperature in the furnace quickly and stably reaches the target value, the dynamic process enters the steady-state process, the temperature is quickly raised in the initial stage of temperature rise, the temperature is slowly raised when the temperature is close to the target temperature, the temperature is continuously raised at a micro speed which is more than 0 within the fluctuation constant range of the heating temperature of the sample, the overshoot of a temperature control system can be effectively reduced, and the condition of overhigh temperature in the furnace is avoided.

Optionally, when the temperature t in the furnace satisfies t > t₀X, setting the sampling period of the temperature T in the furnace to be T₁(ii) a If not, setting the sampling period as T₂And T is₁＜T₂The unit of the sampling period T is min, and the furnaceWhen the internal temperature T is not in the fluctuation range of the heating temperature of the sample, the control of the temperature T in the furnace does not need to be over-accurate, i.e. the sampling period T₁The larger the sampling period T is, when the temperature T in the furnace reaches the fluctuation range of the heating temperature of the sample, the overshoot of the temperature control system is effectively reduced, and the condition of overhigh temperature in the furnace is avoided₂The smaller the need.

Optionally, when t is t₀Then sending a timing enable signal to the PLC control module, starting timing, and the timing time reaches T₃The heating switch is turned off. The method can make the heating time T₃At the target temperature t₀Then timing is started, so that the sample can reach the target temperature t accurately₀The subsequent heating time is set as the heating time T₃The performance reduction of the sample caused by overlong heating time can be avoided, and the operation of manually turning off the heating switch is also avoided.

Alternatively, the fluctuation constant X of the heating temperature is 5 ℃, and in this temperature range, it is ensured that the sample is not excessively heated to cause performance degradation.

Optionally, the temperature detection module is a thermocouple sensor. The thermocouple sensor is the most popular contact temperature measuring device used in industry, because the thermocouple has the characteristics of stable performance, large temperature measuring range, long-distance transmission of signals and the like, and has simple structure and convenient use.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.