阅读说明：本技术 一种燃气炉干燥自动控制方法和系统 (Automatic control method and system for drying of gas furnace ) 是由 李冬根 于 2021-08-16 设计创作，主要内容包括：本发明公开的一种燃气炉干燥自动控制方法,包括如下步骤：步骤1：依据纤维含水率设定值数据和纤维含水率实际测定值数据获得第一温度偏差值数据；步骤2：依据干燥出口温度设定值数据和干燥出口温度实际测定值数据获得第二温度偏差值数据；步骤3：依据热磨机产量数据来获取产量对应温度数据；步骤4：将第一温度偏差值数据、第二温度偏差值数据、产量对应温度数据相加得到干燥进口温度设定值数据；步骤5：依据干燥管道的干燥进口温度实际测定值数据和步骤4的干燥进口温度设定值数据来设定燃气阀门的开度。本发明还公开了实现该燃气炉干燥自动控制方法的系统。本发明可以省去一名操作工,而且温度和含水率控制更稳定,使生产连续性更好。(The invention discloses an automatic control method for drying of a gas furnace, which comprises the following steps: step 1: obtaining a first temperature deviation value data according to the fiber moisture content set value data and the fiber moisture content actual measured value data; step 2: obtaining second temperature deviation value data according to the drying outlet temperature set value data and the drying outlet temperature actual measured value data; and step 3: acquiring temperature data corresponding to the yield according to the yield data of the defibrator; and 4, step 4: adding the first temperature deviation value data, the second temperature deviation value data and the corresponding yield temperature data to obtain drying inlet temperature set value data; and 5: and (4) setting the opening degree of the gas valve according to the actual measured value data of the drying inlet temperature of the drying pipeline and the set value data of the drying inlet temperature in the step (4). The invention also discloses a system for realizing the automatic control method for the gas furnace drying. The invention can omit an operator, and the temperature and the water content are controlled more stably, so that the production continuity is better.)

1. An automatic control method for drying of a gas furnace is characterized by comprising the following steps:

step 1: obtaining a first temperature deviation value data according to the fiber moisture content set value data and the fiber moisture content actual measured value data;

step 2: obtaining second temperature deviation value data according to the drying outlet temperature set value data of the drying pipeline and the actual measured value data of the drying outlet temperature of the drying pipeline;

and step 3: acquiring temperature data corresponding to the yield according to the yield data of the defibrator;

and 4, step 4: adding the first temperature deviation value data of the step 1, the second temperature deviation value data of the step 2 and the corresponding temperature data of the yield of the step 3 to obtain drying inlet temperature set value data;

and 5: and (4) setting the opening degree of the gas valve according to the actual measured value data of the drying inlet temperature of the drying pipeline and the set value data of the drying inlet temperature in the step (4).

2. An automatic control method for gas stove drying according to claim 1, characterized in that said first temperature deviation value data and second temperature data deviation value data are within ± 10.

3. The automatic control method for drying of the gas furnace according to claim 1, wherein the calculation unit calculates the temperature data corresponding to the output of the defibrator according to the defibrator output data by multiplying the defibrator output data by a coefficient K, wherein the coefficient K has a value ranging from 0 to 10.

4. A system for realizing the automatic control method of the gas furnace drying of any claim from 1 to 3 is characterized by comprising a first PID controller, a second PID controller, a third PID controller, an upper computer, a fiber actual moisture content measuring sensor, a defibrator discharging spiral rotating speed sensor, a drying inlet temperature actual value measuring temperature sensor, a drying outlet temperature actual value measuring temperature sensor, a drying inlet temperature set value unit and a gas valve opening actuating mechanism; the upper computer is used for inputting water content set value data and drying outlet temperature set value data; the first PID controller is provided with a water content set value data input end, a water content actual value data input end and a first temperature deviation value data output end, the water content set value data input end of the first PID controller is connected with the water content set value data output end of the upper computer, and the water content actual value data input end of the first PID controller is connected with the fiber actual water content measuring sensor; a first temperature deviation value data output end of the first PID controller selects whether to output first temperature deviation value data or not through a first selection switch;

the upper computer is also provided with a thermal mill discharging spiral rotating speed data input end which is connected with the thermal mill discharging spiral rotating speed sensor;

the upper computer is provided with a calculating unit, the calculating unit calculates the output of the defibrator according to the discharge spiral rotating speed data of the defibrator, calculates the output corresponding temperature data of the defibrator according to the output data of the defibrator and outputs the output through the output end of the output corresponding temperature data on the upper computer;

the second PID controller is provided with a first drying outlet temperature set value data input end, a drying inlet temperature actual value data input end and a second temperature deviation value data output end, the first drying outlet temperature set value data input end of the second PID controller is connected with the drying outlet temperature set value data output end of the upper computer, and the drying inlet temperature actual value data input end of the second PID controller is connected with the drying inlet temperature actual value measuring temperature sensor; a second temperature deviation value data output end of the second PID controller selects whether to output second temperature deviation value data or not through a second selection switch;

the drying inlet temperature set value unit is provided with a first temperature deviation value data input end, a second drying outlet temperature set value data input end, a yield corresponding temperature data input end and a drying inlet temperature set value data output end, the first temperature deviation value data input end of the drying inlet temperature set value unit is connected with the first temperature deviation value data output end of the first PID controller through a first selection switch, the second temperature deviation value data input end of the drying inlet temperature set value unit is connected with the second temperature deviation value data output end of the second PID controller through a second selection switch, the second drying outlet temperature set value data input end of the drying inlet temperature set value unit is connected with the drying outlet temperature set value data output end of the upper computer, the output corresponding temperature data input end of the drying inlet temperature set value unit is connected with the output corresponding temperature data output end of the upper computer;

the third PID controller is provided with a drying inlet temperature set value data input end, a drying outlet temperature actual value data input end and a gas valve opening execution signal output end, the drying inlet temperature set value data input end of the third PID controller is connected with the drying inlet temperature set value data output end of the drying inlet temperature set value unit, the drying outlet temperature actual value data input end of the third PID controller is connected with the drying outlet temperature actual value measuring temperature sensor, and the gas valve opening execution signal output end of the third PID controller is in control connection with the gas valve opening execution mechanism.

5. The system according to claim 4, wherein the first PID controller, the second PID controller and the third PID controller are all self-contained PID control function blocks of Siemens PLC.

6. The system according to claim 4 or 5, wherein the first PID controller, the second PID controller, and the third PID controller are each PID _ Temp of Bologbook.

7. The system of claim 4, wherein the first and second selector switches are in communication to indicate output of first and second temperature data offset values.

Technical Field

The invention relates to the technical field of control of a gas furnace for drying artificial board fibers, in particular to an automatic control method and system for drying of the gas furnace.

Background

In the process of manufacturing the artificial board, the fibers need to be dried to control the moisture content of the fibers. At present, an operator sets the opening of a valve according to the moisture content of the fiber and the temperature of an outlet, and needs to take the responsibility of one operator for modification, and the outlet is far away from the gas furnace, so that the operation has hysteresis, the moisture content and the temperature of the fiber are easy to fluctuate greatly, and the product quality is influenced.

Disclosure of Invention

One of the technical problems to be solved by the invention is to provide an automatic control method for drying a gas furnace, aiming at the problems that the gas furnace has larger water content and temperature fluctuation of fibers and influences the product quality due to the hysteresis of the operation of the gas furnace in the process of drying an artificial board.

The second technical problem to be solved by the present invention is to provide a system for implementing the above-mentioned automatic control method for gas stove drying.

In order to achieve the purpose, the invention discloses an automatic control method for drying of a gas furnace, which comprises the following steps:

step 1: obtaining a first temperature deviation value data according to the fiber moisture content set value data and the fiber moisture content actual measured value data;

step 2: obtaining second temperature deviation value data according to the drying outlet temperature set value data of the drying pipeline and the actual measured value data of the drying outlet temperature of the drying pipeline;

and step 3: acquiring temperature data corresponding to the yield according to the yield data of the defibrator;

and 4, step 4: adding the first temperature deviation value data of the step 1, the second temperature deviation value data of the step 2 and the corresponding temperature data of the yield of the step 3 to obtain drying inlet temperature set value data;

and 5: and (4) setting the opening degree of the gas valve according to the actual measured value data of the drying inlet temperature of the drying pipeline and the set value data of the drying inlet temperature in the step (4).

In a preferred embodiment of the invention, the first temperature data deviation value data and the second temperature data deviation value data are between ± 10.

In a preferred embodiment of the present invention, the calculating unit calculates the temperature data corresponding to the output of the defibrator according to the defibrator output data, wherein the temperature data corresponding to the output of the defibrator is obtained by multiplying the defibrator output data by a coefficient K, and the value of the coefficient K is in a range of 0 to 10.

The invention discloses an automatic control system for drying of a gas furnace, which comprises a first PID controller, a second PID controller, a third PID controller, an upper computer, a fiber actual water content measuring sensor, a defibrator discharging spiral rotating speed sensor, a drying inlet temperature actual value measuring temperature sensor, a drying outlet temperature actual value measuring temperature sensor, a drying inlet temperature set value unit and a gas valve opening actuating mechanism, wherein the first PID controller is connected with the second PID controller; the upper computer is used for inputting water content set value data and drying outlet temperature set value data; the first PID controller is provided with a water content set value data input end, a water content actual value data input end and a first temperature deviation value data output end, the water content set value data input end of the first PID controller is connected with the water content set value data output end of the upper computer, and the water content actual value data input end of the first PID controller is connected with the fiber actual water content measuring sensor; a first temperature deviation value data output end of the first PID controller selects whether to output first temperature deviation value data or not through a first selection switch;

the upper computer is also provided with a thermal mill discharging spiral rotating speed data input end which is connected with the thermal mill discharging spiral rotating speed sensor;

the upper computer is provided with a calculating unit, the calculating unit calculates the output of the defibrator according to the discharge spiral rotating speed data of the defibrator, calculates the output corresponding temperature data of the defibrator according to the output data of the defibrator and outputs the output through the output end of the output corresponding temperature data on the upper computer;

the second PID controller is provided with a first drying outlet temperature set value data input end, a drying inlet temperature actual value data input end and a second temperature deviation value data output end, the first drying outlet temperature set value data input end of the second PID controller is connected with the drying outlet temperature set value data output end of the upper computer, and the drying inlet temperature actual value data input end of the second PID controller is connected with the drying inlet temperature actual value measuring temperature sensor; a second temperature deviation value data output end of the second PID controller selects whether to output second temperature deviation value data or not through a second selection switch;

the drying inlet temperature set value unit is provided with a first temperature deviation value data input end, a second drying outlet temperature set value data input end, a yield corresponding temperature data input end and a drying inlet temperature set value data output end, the first temperature deviation value data input end of the drying inlet temperature set value unit is connected with the first temperature deviation value data output end of the first PID controller through a first selection switch, the second temperature deviation value data input end of the drying inlet temperature set value unit is connected with the second temperature deviation value data output end of the second PID controller through a second selection switch, the second drying outlet temperature set value data input end of the drying inlet temperature set value unit is connected with the drying outlet temperature set value data output end of the upper computer, the output corresponding temperature data input end of the drying inlet temperature set value unit is connected with the output corresponding temperature data output end of the upper computer;

the third PID controller is provided with a drying inlet temperature set value data input end, a drying outlet temperature actual value data input end and a gas valve opening execution signal output end, the drying inlet temperature set value data input end of the third PID controller is connected with the drying inlet temperature set value data output end of the drying inlet temperature set value unit, the drying outlet temperature actual value data input end of the third PID controller is connected with the drying outlet temperature actual value measuring temperature sensor, and the gas valve opening execution signal output end of the third PID controller is in control connection with the gas valve opening execution mechanism.

In a preferred embodiment of the invention, the first PID controller, the second PID controller and the third PID controller are all self-contained PID control function blocks of siemens PLC.

In a preferred embodiment of the present invention, the first PID controller, the second PID controller and the third PID controller are PID _ Temp of the Bologbook.

In a preferred embodiment of the present invention, the first selector switch and the second selector switch communicate to output the first temperature deviation value data and the second temperature deviation value data.

Due to the adoption of the technical scheme, an operator can be saved through the automatic control system for drying the gas furnace, and the temperature and the water content are controlled more stably, so that the production continuity is better.

Drawings

Fig. 1 is a schematic diagram of the principle of the automatic control system for drying the gas furnace.

Detailed Description

The invention is further described below in conjunction with the appended drawings and detailed description.

The invention relates to an automatic control method for drying of a gas furnace, which specifically comprises the following steps:

step 1: obtaining a first temperature deviation value data according to the fiber moisture content set value data and the fiber moisture content actual measured value data;

step 2: obtaining second temperature deviation value data according to the drying outlet temperature set value data of the drying pipeline and the actual measured value data of the drying outlet temperature of the drying pipeline;

and step 3: acquiring temperature data corresponding to the yield according to the yield data of the defibrator;

and 4, step 4: adding the first temperature deviation value data of the step 1, the second temperature deviation value data of the step 2 and the corresponding temperature data of the yield of the step 3 to obtain drying inlet temperature set value data;

and 5: and (4) setting the opening degree of the gas valve according to the actual measured value data of the drying inlet temperature of the drying pipeline and the set value data of the drying inlet temperature in the step (4).

The above-mentioned automatic control method for the drying of the gas furnace can be realized by the automatic control system for the drying of the gas furnace shown in fig. 1, which is as follows

An automatic control system for drying of a gas furnace shown in fig. 1 comprises a first PID controller 10, a second PID controller 20, a third PID controller 30, an upper computer (not shown in the figure), a fiber actual moisture content measuring sensor 40, a defibrator discharging screw speed sensor (not shown in the figure), a drying inlet temperature actual value measuring temperature sensor 50, a drying outlet temperature actual value measuring temperature sensor 60, a drying inlet temperature set value unit 70 and a gas valve opening actuating mechanism (not shown in the figure).

The first PID controller 10, the second PID controller 20 and the third PID controller 30 are all self-contained PID control function blocks of Siemens PLC. Particularly PID _ Temp for Bopom.

The upper computer is used for inputting set value data of the water content and set value data of the drying outlet temperature; the upper computer is also provided with a thermal mill discharging spiral rotating speed data input end, and the thermal mill discharging spiral rotating speed data input end is connected with a thermal mill discharging spiral rotating speed sensor; the host computer is provided with a calculation unit which calculates the output of the defibrator according to the discharge spiral rotating speed data of the defibrator, calculates the output corresponding temperature data of the defibrator according to the output data of the defibrator and outputs the data through an output end 80 of the output corresponding temperature data on the host computer. The calculation unit calculates the temperature data corresponding to the output of the defibrator according to the output data of the defibrator, and the temperature data is obtained by multiplying the output data of the defibrator by a coefficient K, wherein the value range of the coefficient K is 0-10.

The first PID controller 10 is provided with a water content set value data input end, a water content actual value data input end and a first temperature deviation value data output end, the water content set value data input end of the first PID controller 10 is connected with the water content set value data output end of the upper computer, and the water content actual value data input end of the first PID controller 10 is connected with the fiber actual water content measuring sensor 40; a first temperature deviation value data output end of the first PID controller 10 selects whether to output the first temperature deviation value data through a first selection switch 90; the first selector switch 90 is in communication with 0, which is the first temperature deviation value data calculated without the first PID controller 10, and in communication with the first PID controller 10, which is the first temperature deviation value data calculated with the first PID controller 10. The first temperature deviation value is within ± 10, specifically adjusted according to actual conditions in the field, and is 0 if the first temperature deviation value calculated without using the first PID controller 10 is selected.

The second PID controller 20 has a first dry outlet temperature set value data input terminal, a dry inlet temperature actual value data input terminal and a second temperature deviation value data output terminal, the first dry outlet temperature set value data input terminal of the second PID controller 20 is connected with the dry outlet temperature set value data output terminal of the upper computer, the dry inlet temperature actual value data input terminal of the second PID controller 20 is connected with the dry inlet temperature actual value measured temperature sensor 50; a second temperature deviation value data output end of the second PID controller 20 selects whether to output the second temperature deviation value data through a second selection switch 100; the second selection switch 100 is communicated with 0, which is the second temperature deviation value data calculated without the second PID controller 20, and is communicated with the second PID controller 20, which is the second temperature deviation value data calculated with the second PID controller 20. The second temperature deviation value is within ± 10, and is 0 if the second temperature deviation value calculated without using the second PID controller 20 is selected for adjustment according to the actual situation at the site.

The drying inlet temperature set point unit 70 has a first temperature deviation value data input, a second drying outlet temperature set point data input, a yield corresponding temperature data input, and a drying inlet temperature set point data output. A first temperature deviation value data input end of the drying inlet temperature setting value unit 70 is connected with a first temperature deviation value data output end of the first PID controller 10 through a first selection switch 90, a second temperature deviation value data input end of the drying inlet temperature setting value unit 70 is connected with a second temperature deviation value data output end of the second PID controller 20 through a second selection switch 100, a second drying outlet temperature setting value data input end of the drying inlet temperature setting value unit 70 is connected with a drying outlet temperature setting value data output end of the upper computer, and a yield corresponding temperature data input end of the drying inlet temperature setting value unit 70 is connected with a yield corresponding temperature data output end 80 of the upper computer.

And the drying inlet temperature set value data is dry outlet temperature set value data + first temperature deviation value data + second temperature deviation value data + yield corresponding temperature data.

The third PID controller 30 has a drying inlet temperature set value data input terminal, a drying outlet temperature actual value data input terminal and a gas valve opening degree execution signal output terminal, the drying inlet temperature set value data input terminal of the third PID controller 30 is connected with the drying inlet temperature set value data output terminal of the drying inlet temperature set value unit 70, the drying outlet temperature actual value data input terminal of the third PID controller 30 is connected with the drying outlet temperature actual value determination temperature sensor 60, and the gas valve opening degree execution signal output terminal of the third PID controller 30 is in control connection with the gas valve opening degree execution mechanism.

The gas valve opening executing mechanism starts a gas valve of the gas furnace according to a gas valve opening executing signal, the set value (the range is 0-100) of the gas valve opening is larger, and the temperature is higher.