CN114246230A - Circulating air type yellow-smoldering equipment for processing yellow tea and control method - Google Patents
Circulating air type yellow-smoldering equipment for processing yellow tea and control method Download PDFInfo
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- CN114246230A CN114246230A CN202111614748.7A CN202111614748A CN114246230A CN 114246230 A CN114246230 A CN 114246230A CN 202111614748 A CN202111614748 A CN 202111614748A CN 114246230 A CN114246230 A CN 114246230A
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F3/00—Tea; Tea substitutes; Preparations thereof
- A23F3/06—Treating tea before extraction; Preparations produced thereby
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
Abstract
The invention discloses circulating air type yellow tea smoldering equipment for processing yellow tea and a control method thereof. The invention can realize continuous production of tea and use PLC to control temperature and humidity, thus leading the tea to be more uniform in yellow and improving the quality and production efficiency of yellow tea.
Description
Technical Field
The invention relates to the technical field of tea processing, in particular to air return type equipment for continuously and airtightly yellowing yellow tea and a temperature and humidity control method thereof.
Background
The tight yellowing is a key process for forming yellow tea with yellow and bright soup color and mellow taste, the temperature needs to be 40-45 ℃ during the tight yellowing, the relative humidity needs to be about 90%, and the tight yellowing process is mainly used for promoting the chemical change of bud leaves through the damp-heat effect so as to form the quality characteristics of the yellow tea. Traditional stifled yellow technique relies on the manual work to pile stifled more, and present stifled yellow equipment is mostly closed single-machine equipment, and degree of automation is low, mainly shows: the equipment is closed, and continuous production cannot be realized; when the equipment runs, the inertia of the temperature and the humidity is large, and the heating and humidifying mode is unreasonable, so that the internal temperature and the humidity are uneven.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the circulating air type yellow tea stewing equipment for processing the yellow tea and the control method thereof so as to realize continuous production of the tea and effectively control the temperature and the humidity, thereby ensuring that the tea is stewed to be more uniform and improving the quality and the production efficiency of the yellow tea.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to a circulating air type yellow stewing device for processing yellow tea, which is characterized in that a box body is arranged on a supporting frame, a tea feeding hole is arranged above one side of the box body, a stepped conveying belt is arranged in the box body, and a motor and a reducer module drive a chain wheel and a chain transmission mechanism on the conveying belt; a homogenizing plate is arranged above the conveyor belt below the tea feeding hole; a tea discharging port is formed in one side of the bottom of the box body, and a transverse discharging conveyor belt is arranged at the tea discharging port, so that tea entering the box body from the feeding port can reach the discharging port after being conveyed layer by the conveyor belt and is transferred to the next process through the transverse discharging conveyor belt;
an air outlet cover is arranged on one side surface of the box body; the other side surface of the box body is provided with an air return cover; an air outlet of the air outlet cover is connected with a bent pipe which turns downwards; the bent pipe is connected to one end of a first axial flow fan, and the other end of the first axial flow fan is connected with a horizontally-steering bent pipe; the bent pipe is connected to a humidifying pipeline in the middle through a first electric heating furnace, the humidifying pipeline is connected to an upward-turning bent pipe through a second electric heating furnace, and the bent pipe is connected to a horizontally-turning bent pipe through a second axial flow fan; the bent pipe is connected with the air inlet of the air return cover; thereby forming an air return structure in the box body;
a temperature and humidity sensor is arranged in the middle of the interior of the box body, a temperature sensor is arranged at a tuyere of the second electric furnace, and a first air speed sensor and a second air speed sensor are respectively arranged in the bent pipe and the bent pipe;
the humidifying pipeline is connected with the steam generator through a metal corrugated pipe, and an electric valve is arranged at a steam outlet of the steam generator.
The circulating air type yellow stewing equipment for processing the yellow tea is also characterized in that baffle partitions with the same number as the conveyor belt levels are respectively arranged in the air outlet cover and the air return cover, and the baffle partitions are uniformly arranged at the air outlet of the air outlet cover and the air inlet of the air return cover, so that the air blown by the two axial flow fans can uniformly circulate in the box body.
Sealing gaskets are arranged at all the connecting positions, and the outer surfaces of the box body and all the bent pipes are attached with heat preservation cotton.
The invention relates to a control method of circulating air type yellow stewing equipment for processing yellow tea, which is characterized by comprising the following steps of:
step 0, starting the air return type equipment, and setting the temperature to be kept at [ T ]1，T2]Wherein, T1Lower limit value of temperature, T2Represents an upper limit value of temperature, and T1<T2(ii) a Set relative humidity to be maintained at [ R ]1，R2]Wherein R is1Lower limit of humidity, R2Represents an upper limit value of humidity, and R1<R2(ii) a Setting the yellow time as time, and setting a temperature and humidity sensorIs t, and sets the current k-th sampling period as tkInitializing k to 1;
starting the first electric heating furnace, the second electric heating furnace, the first axial flow fan and the second axial flow fan to preheat the return air type equipment;
electrically preheating the steam generator;
the PLC controller calculates the k sampling period t according to the data of each sensorkTemperature difference TE(tk)＝T1-T0(tk) Humidity difference RE(tk)＝R1-R0(tk) Temperature value T0(tk) Rate of change T of0C(tk)＝(T0(tk)-T0(tk-1) T, temperature T)L(tk) Rate of change T ofLC(tk)＝(TL(tk)-TL(tk-1) T), wherein T0(tk-1) Represents the k-1 th sampling period tk-1Setting the temperature value detected by the temperature and humidity sensor; t is0(tk-1) Represents the k-1 th sampling period tk-1Setting T as the humidity value detected by the temperature and humidity sensor when k is 10(tk-1)＝T0(tk)，TL(tk-1)＝TL(tk)；
If delta1≥TE(tk)＞δ2Then step 7 is performed, where δ2Is a second temperature difference, and δ2∈(0℃，δ1)；
If delta2≥TE(tk) If the temperature is higher than 0 ℃, executing the step 8;
if 0 is more than or equal to TE(tk)≥(T1-T2) Then, determine T0CWhether the judgment result is more than or equal to 0 or not is true, if so, the step 9 is executed; otherwise, executing step 8;
if TE(tk)＜(T1-T2) Then, step 10 is executed;
Xi is a1≥RE(tk)＞ξ2The PLC outputs the analog quantity of the second opening value to the electric valve, so that the electric valves on the boilers are adjusted to the second opening omega2In which ξ2Indicating a second humidity difference, ξ2∈(0％，ξ1)，ω2∈[40％，60％]；
Xi is a2≥RE(tk)＞0, the PLC outputs the analog quantity of the third opening degree value to the electric valve, so that the electric valve on the boiler is adjusted to the third opening degree omega3Wherein, ω is3∈(0％，20％]；
If 0 is not less than RE(tk)≥(R1-R2) If so, the PLC outputs the fully closed analog quantity to the electric valve, so that the electric valve on the boiler is fully closed;
if (R)1-R2)＞RE(tk) If the boiler is in a closed state, the PLC outputs a fully-closed analog quantity to the electric valve, so that the electric valve on the boiler is fully closed, and the rotating speeds of the first axial flow fan and the second axial flow fan are adjusted, so that the rotating speed of the first axial flow fan is higher than that of the second axial flow fan, and the rotating speed difference between the first axial flow fan and the second axial flow fan is psi2Wherein ψ2E (600 rpm, 900 rpm);
Xi is a1≥RE(tk)＞ξ2The PLC outputs the analog quantity of the fifth opening degree value to the electric valve, so that the electric valve on the boiler is adjusted to the fifth opening degree omega5Wherein, ω is5∈(ω3,ω2)；
Xi is a2≥RE(tk) If the opening degree is more than 0, the PLC outputs the analog quantity of the sixth opening degree value to the electric valve, so that the electric valve on the boiler is adjusted to the sixth opening degree omega6Wherein, ω is6∈(0,ω3)；
If 0 is not less than RE(tk)≥(R1-R2) If so, the PLC outputs the fully closed analog quantity to the electric valve, so that the electric valve on the boiler is fully closed;
if (R)1-R2)＞RE(tk) The PLC controller outputs the fully closed analog quantity to the electric valve to enable the electric valve to be closedFully closing an electric valve on the boiler, and adjusting the rotating speeds of the first axial flow fan and the second axial flow fan to ensure that the rotating speed of the first axial flow fan is higher than that of the second axial flow fan, and the wind speed difference between the first axial flow fan and the second axial flow fan is psi2。
Compared with the prior art, the invention has the beneficial effects that:
1. the device realizes the continuous flow of air in the box body in a return air mode, thereby keeping the temperature and the humidity in the box body uniform, reducing the energy dissipation and facilitating the heating and the humidification of large-volume equipment;
2. the device of the invention enables the tea production and processing to be carried out continuously, and the yellow stewing box with the built-in conveyor belt is used for replacing a tray in the traditional yellow stewing chamber, so that the tea can continuously enter from the feeding hole and be output from the discharging hole while the manpower and time are effectively reduced, and the continuous production of the tea is realized;
3. the equipment of the invention uses double electric furnaces for heating, and can keep the temperature of the circulating pipeline while meeting the temperature of the equipment, so that the high-temperature and high-humidity air keeps a state during circulation, and water vapor in the air can not be condensed and dripped to influence the humidification effect;
4. the invention further improves the temperature and humidity control method and the control mode of yellow smoldering time, the temperature control adopts the feedback of a secondary sensor, a corresponding regional control method is designed, the problem of temperature control overshoot is effectively solved, the control precision is high, the humidity control adopts a mode of controlling between regions, the temperature and humidity coupling is solved, the operation of yellow smoldering equipment is simpler, the yellow smoldering is more uniform, and the quality of the yellow tea is improved.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a perspective view of the housing of the apparatus of the present invention;
FIG. 3 is a left side view of the apparatus of the present invention;
FIG. 4 is a schematic view of a return air cover structure of the apparatus of the present invention;
FIG. 5 is a three-dimensional view of the apparatus of the present invention;
FIG. 6 is a flow chart of temperature and humidity control of the apparatus of the present invention;
reference numbers in the figures: 1 a horizontally-turned elbow; 2, a return air cover; 3, a tea feeding hole; 4, a box body; 5, air outlet housing; 6 a bent pipe which turns downwards; 7 a first axial fan; 8 a horizontally turned elbow 8; 9 a first electric heater; 10, supporting frames; 11 a humidifying conduit; 12 a second electric heater; 13 an upwardly turned elbow; 14 a second axial fan; 15 material homogenizing plate; 16 a conveyor belt; 17 a temperature and humidity sensor; 18 a first wind speed sensor; 19; 20 a second wind speed sensor; 21 a steam generator; 22 an electrically operated valve; 23 a metal bellows; 24 motor and retarder modules; 25 chain wheel and chain transmission mechanism; 26 transverse to the exit conveyor.
Detailed Description
In the embodiment, as shown in fig. 1 and 5, a circulating air type yellow stewing device for processing yellow tea is characterized in that a box body 4 is arranged on a supporting frame 10, a tea leaf feeding port 3 is arranged above one side of the box body 4, as shown in fig. 2, four stepped conveying belts 16 are arranged in the box body 4, and a motor and reducer module 24 drives chain wheels and a chain transmission mechanism 25 on the conveying belts 16; a material homogenizing plate 15 is arranged above the conveyor belt 16 below the tea feeding hole 3; a tea discharging port is formed in one side of the bottom of the box body 4, and a transverse discharging conveyor belt 26 is arranged at the tea discharging port, so that tea entering the box body 4 from the feeding port can reach the discharging port after being conveyed layer by the conveyor belt 16, and is transferred to the next working procedure through the transverse discharging conveyor belt 26; thereby effectively reducing manpower and time and realizing continuous production of the tea;
as shown in fig. 1, an air outlet cover 5 is arranged on one side surface of a box body 4; the other side surface of the box body 4 is provided with an air return cover 2; an air outlet of the air outlet cover 5 is connected with a bent pipe 6 which turns downwards; the bent pipe 6 is connected to one end of a first axial flow fan 7, and the other end of the first axial flow fan 7 is connected with a bent pipe 8 which turns horizontally; the elbow 8 is connected to a humidifying pipeline 11 in the middle through a first electric heating furnace 9, the humidifying pipeline 11 is connected to an upward-turning elbow 13 through a second electric heating furnace 12, and the elbow 13 is connected to the horizontally-turning elbow 1 through a second axial flow fan 14; the bent pipe 1 is connected with an air inlet of the air return cover 2; thereby forming an air return structure in the box body 4; therefore, the temperature and the humidity in the box body can be kept uniform, the energy dissipation can be reduced, and the heating and the humidification of large-volume equipment are facilitated;
as shown in fig. 2, a temperature and humidity sensor 17 is provided at a middle position inside the box 4, a temperature sensor 19 is provided at a tuyere of the second electric furnace 12, and a first wind speed sensor 18 and a second wind speed sensor 20 are provided in the elbow pipe 8 and the elbow pipe 13, respectively;
as shown in fig. 3, the humidifying conduit 11 is connected to the steam generator 21 through a metal bellows 23, and an electric valve 22 is provided at a steam outlet of the steam generator 21.
In specific implementation, as shown in fig. 4, baffle partitions with the same number as the number of the conveyor belts 16 in the air outlet cover 5 and the air return cover 2 are respectively arranged in the air outlet of the air outlet cover 5 and the air inlet of the air return cover 2, so that the wind energy blown by the two axial flow fans can uniformly circulate in the box 4.
Sealing gaskets are arranged at all the connecting positions, and the outer surfaces of the box body 4 and all the bent pipes are attached with heat preservation cotton.
In this embodiment, as shown in fig. 6, a method for controlling a circulating air type yellow-smoldering device for processing yellow tea is performed according to the following steps:
step 0, starting the air return type equipment, and setting the temperature to be kept at [ T ]1，T2]Wherein, T1Lower limit value of temperature, T2Represents an upper limit value of temperature, and T1<T2(ii) a Set relative humidity to be maintained at [ R ]1，R2]Wherein R is1Lower limit of humidity, R2Represents an upper limit value of humidity, and R1<R2(ii) a Setting the dark yellow time as time, setting the sampling period of the temperature and humidity sensor 17 as t, and setting the current k-th sampling period as tkInitializing k to 1;
starting the first electric heating furnace, the second electric heating furnace, the first axial flow fan and the second axial flow fan to preheat the return air type equipment;
the steam generator (21) is electrically preheated;
the PLC controller calculates the k sampling period t according to the data of each sensorkTemperature difference TE(tk)＝(T1-T0(tk) ) difference in humidity RE(tk)＝(R1-R0(tk) Temperature value T), temperature value T0(tk) Rate of change T of0C(tk)＝(T0(tk)-T0(tk-1) T, temperature T)L(tk) Rate of change T ofLC(tk)＝(TL(tk)-TL(tk-1) T), wherein T0(tk-1) Represents the k-1 th sampling period tk-1The temperature value detected by the lower temperature and humidity sensor 17; t is0(tk-1) Represents the k-1 th sampling period tk-1When k is 1, let T be the humidity detected by the lower temperature/humidity sensor 170(tk-1)＝T0(tk)，TL(tk-1)＝TL(tk)；
if the temperature is more than or equal to 3 DEG CE(tk) If the temperature is higher than 1.5 ℃, executing the step 7;
if T is more than or equal to 1.5 DEG CE(tk) If the temperature is higher than 0 ℃, executing the step 8;
if 0 is more than or equal to TE(tk)≥(T1-T2) Then, determine T0CWhether the judgment result is more than or equal to 0 or not is true, if so, the step 9 is executed; otherwise, executing step 8;
if TE(tk)＜(T1-T2) Then, step 10 is executed;
because the mixing speed of the hot steam and the air is high, the inertia is small, and the steam amount entering the box body is controlled by controlling the opening degree of the electric valve 22 at the outlet of the boiler 21 according to the humidity;
if 15% is greater than or equal to RE(tk) If the opening degree is more than 5%, the PLC outputs the analog quantity of the second opening degree value to the electric valve 22, so that the electric valves 22 on the boilers 21 are adjusted to the second opening degree of 60%;
if 5% is greater than or equal to RE(tk) If the numerical value is more than 0, the PLC outputs the analog quantity of the third opening degree value to the electric valve 22, so that the electric valve 22 on the boiler 21 is adjusted to the third opening degree of 20 percent;
if 0 is not less than RE(tk)≥(R1-R2) If so, the PLC outputs the fully closed analog quantity to the electric valve 22, so that the electric valve 22 on the boiler 21 is fully closed;
if (R)1-R2)＞RE(tk) Then, the PLC controller outputs the fully-closed analog quantity to the electric valve, so that the electric valve 22 on the boiler 21 is fully closed, and adjusts the rotation speeds of the first axial fan 7 and the second axial fan 14, so that the rotation speed of the first axial fan 7 is higher than that of the second axial fan 14, and the two are both higher than that of the first axial fan 7The rotating speed difference is 900 r/min, so that air pressure difference is generated in the box body 4, more fresh air is sucked from the feeding port and the discharging port to enter the circulating air duct, and the humidity is reduced;
if 15% is greater than or equal to RE(tk) If the opening degree is more than 5%, the PLC outputs the analog quantity of the fifth opening degree value to the electric valve 22, so that the electric valve 22 on the boiler 21 is adjusted to the fifth opening degree of 40%;
if 5% is greater than or equal to RE(tk) If the opening degree is more than 0, the PLC outputs the analog quantity of the sixth opening degree value to the electric valve 22, so that the electric valve 22 on the boiler 21 is adjusted to the sixth opening degree of 10 percent;
if 0 is not less than RE(tk)≥(R1-R2) If so, the PLC outputs the fully closed analog quantity to the electric valve 22, so that the electric valve 22 on the boiler 21 is fully closed;
if (R)1-R2)＞RE(tk) Then, the PLC controller outputs the fully-closed analog quantity to the electric valve 22, so that the electric valve 22 on the boiler 21 is fully closed, and adjusts the rotation speeds of the first axial flow fan 7 and the second axial flow fan 14, so that the rotation speed of the first axial flow fan 7 is higher than that of the second axial flow fan 14, and the rotation speed difference between the first axial flow fan and the second axial flow fan is 900 rpm, thereby generating a pressure difference in the box body 4, and sucking more fresh air from the feeding port and the discharging port into the circulating air duct, thereby reducing the humidity.
Claims (4)
1. A circulating air type yellow stewing device for processing yellow tea is characterized in that a box body (4) is arranged on a supporting frame (10), a tea feeding hole (3) is formed above one side of the box body (4), a stepped conveying belt (16) is arranged in the box body (4), and a chain wheel and a chain transmission mechanism (25) on the conveying belt (16) are driven by a motor and a reducer module (24); a homogenizing plate (15) is arranged above the conveyor belt (16) below the tea feeding hole (3); a tea discharging port is formed in one side of the bottom of the box body (4), and a transverse discharging conveyor belt (26) is arranged at the tea discharging port, so that tea entering the box body (4) from a feeding port can reach the discharging port after being conveyed layer by the conveyor belt (16), and is transferred to the next working procedure through the transverse discharging conveyor belt (26);
an air outlet cover (5) is arranged on one side surface of the box body (4); the other side surface of the box body (4) is provided with a wind return cover (2); an air outlet of the air outlet cover (5) is connected with a bent pipe (6) which turns downwards; the bent pipe (6) is connected to one end of a first axial flow fan (7), and the other end of the first axial flow fan (7) is connected with a horizontally-steering bent pipe (8); the bent pipe (8) is connected to a humidifying pipeline (11) in the middle through a first electric heating furnace (9), the humidifying pipeline (11) is connected to an upward-turning bent pipe (13) through a second electric heating furnace (12), and the bent pipe (13) is connected to the horizontal-turning bent pipe (1) through a second axial flow fan (14); the bent pipe (1) is connected with an air inlet of the air return cover (2); thereby forming an air return structure in the box body (4);
a temperature and humidity sensor (17) is arranged in the middle of the interior of the box body (4), a temperature sensor (19) is arranged at a tuyere of the second electric furnace (12), and a first air speed sensor (18) and a second air speed sensor (20) are respectively arranged in the bent pipe (8) and the bent pipe (13);
the humidifying pipeline (11) is connected with the steam generator (21) through a metal corrugated pipe (23), and an electric valve (22) is arranged at a steam outlet of the steam generator (21).
2. The circulating air type yellow tea stewing equipment for processing the yellow tea as claimed in claim 1, wherein baffle partitions with the same number of levels as the conveyor belt (16) are respectively arranged in the air outlet cover (5) and the air return cover (2), and the baffle partitions are uniformly arranged at an air outlet of the air outlet cover (5) and an air inlet of the air return cover (2), so that wind energy blown by two axial flow fans can uniformly circulate in the box body (4).
3. The circulating air type yellow-smoldering device for processing yellow tea as claimed in claim 1, wherein each connecting position is provided with a sealing gasket, and the outer surfaces of the box body (4) and each bent pipe are respectively attached with heat preservation cotton.
4. A control method of the circulating air type yellow-smoldering equipment for yellow tea processing based on claim 1 is characterized by comprising the following steps:
step 0, starting the air return type equipment, and setting the temperature to be kept at [ T ]1，T2]Wherein, T1Lower limit value of temperature, T2Represents an upper limit value of temperature, and T1<T2(ii) a Set relative humidity to be maintained at [ R ]1，R2]Wherein R is1Lower limit of humidity, R2Represents an upper limit value of humidity, and R1<R2(ii) a Setting the dark yellow time as time, setting the sampling period of the temperature and humidity sensor (17) as t, and setting the current k-th sampling period as tkInitializing k to 1;
starting the first electric heating furnace, the second electric heating furnace, the first axial flow fan and the second axial flow fan to preheat the return air type equipment;
the steam generator (21) is electrically preheated;
step 1, in the k sampling period tkThe temperature and humidity sensor (17) detects a temperature value T0(tk) And a humidity value R0(tk) The temperature sensor (19) detects the temperature T at the second electric furnace (12)L(tk) And the data are fed back to an external PLC controller;
the PLC controller calculates the k sampling period t according to the data of each sensorkTemperature difference TE(tk)＝T1-T0(tk) Humidity difference RE(tk)＝R1-R0(tk) Temperature value T0(tk) Rate of change T of0C(tk)＝(T0(tk)-T0(tk-1) T, temperature T)L(tk) Rate of change T ofLC(tk)＝(TL(tk)-TL(tk-1) T), wherein T0(tk-1) To representThe k-1 th sampling period tk-1The temperature value detected by the temperature and humidity sensor (17) is measured; t is0(tk-1) Represents the k-1 th sampling period tk-1When k is 1, T is set as the humidity value detected by the temperature/humidity sensor (17)0(tk-1)＝T0(tk)，TL(tk-1)＝TL(tk)；
Step 2, performing temperature control according to the processes of the step 3 to the step 10, and simultaneously performing humidity control according to the processes of the step 11 to the step 13;
step 3, if TL(tk)＜T2If yes, executing step 4; otherwise, executing step 9;
step 4, if TLCIf less than 0, executing step 5; otherwise, executing step 9;
step 5, if TE(tk)＞δ1Then step 6 is performed, where δ1Is a first temperature difference, and δ1∈(0℃，5℃]；
If delta1≥TE(tk)＞δ2Then step 7 is performed, where δ2Is a second temperature difference, and δ2∈(0℃，δ1)；
If delta2≥TE(tk) If the temperature is higher than 0 ℃, executing the step 8;
if 0 is more than or equal to TE(tk)≥(T1-T2) Then, determine T0CWhether the judgment result is more than or equal to 0 or not is true, if so, the step 9 is executed; otherwise, executing step 8;
if TE(tk)＜(T1-T2) Then, step 10 is executed;
step 6, the PLC outputs closing signals to the first electric heating furnace (9) and the second electric heating furnace (12) to control the contactors on the main lines to be closed, so that the first electric heating furnace (9) and the second electric heating furnace (12) are powered on, and the T-shaped electric heating furnace is powered onLCReaches a set first temperature change rate lambda1When the electric heating furnace is started, the PLC outputs a disconnection signal to the first electric heating furnace (9) and the second electric heating furnace (12) so as to control a contactor on a main circuit of the first electric heating furnace and the second electric heating furnaceCut off to cut off the first electric heater (9) and the second electric heater (12), wherein lambda1E (0 ℃/s, 3 ℃/s)]；
Step 7, the PLC outputs closing signals to the first electric heating furnace (9) and the second electric heating furnace (12) to control the contactors on the main lines to be closed, so that the first electric heating furnace (9) and the second electric heating furnace (12) are powered on, and the T-shaped electric heating furnace is powered onLCReaches the set second temperature change rate lambda2When the electric heating furnace is started, the PLC outputs a disconnection signal to the first electric heating furnace (9) and the second electric heating furnace (12) so as to control the contactors on the main lines of the first electric heating furnace and the second electric heating furnace to be disconnected, so that the first electric heating furnace (9) and the second electric heating furnace (12) are powered off; wherein λ is2E (0 ℃/sec, lambda)1)；
Step 8, the PLC outputs closing signals to the first electric heating furnace (9) and the second electric heating furnace (12) to control the contactors on the main lines to be closed, so that the first electric heating furnace (9) and the second electric heating furnace (12) are powered on, and the T-shaped electric heating furnace is powered onLCReaches the set third temperature change rate lambda3When the electric heating furnace is started, the PLC outputs a disconnection signal to the first electric heating furnace (9) and the second electric heating furnace (12) so as to control the contactors on the main lines of the first electric heating furnace and the second electric heating furnace to be disconnected, so that the first electric heating furnace (9) and the second electric heating furnace (12) are powered off; wherein λ is3E (0 ℃/sec, lambda)2)；
Step 9, the PLC outputs a disconnection signal to the first electric heating furnace (9) and the second electric heating furnace (12) to control the contactors on the main lines of the first electric heating furnace and the second electric heating furnace to be disconnected, so that the first electric heating furnace (9) and the second electric heating furnace (12) are powered off;
step 10, the PLC outputs a disconnection signal to the first electric heating furnace (9) and the second electric heating furnace (12) to control the contactors on the main lines of the first electric heating furnace (9) and the second electric heating furnace (12) to be disconnected, so that the first electric heating furnace (9) and the second electric heating furnace (12) are disconnected, the rotating speeds of the first axial flow fan (7) and the second axial flow fan (14) are adjusted, the rotating speed of the first axial flow fan (7) is higher than that of the second axial flow fan (14), and the rotating speed difference between the first axial flow fan and the second axial flow fan is psi1(ii) a Wherein psi1E (600 rpm, 900 rpm);
step 11, if T0(tk) If greater than eta, execute step 12, otherwise, executeStep 13 is performed, where η represents a first temperature value, η ∈ (40 ℃, 45 ℃);
step 12, if R isE(tk)＞ξ1The PLC controller outputs the analog quantity of the first opening value to the electric valve (22) so that the electric valve (22) on the boiler (21) is adjusted to the first opening omega1In which ξ1Representing a first humidity difference, ξ1∈(0％，15％]，ω1∈[80％，90％]；
Xi is a1≥RE(tk)＞ξ2The PLC outputs the analog quantity of the second opening degree value to the electric valve (22) so that the electric valve (22) on the boilers (21) is adjusted to the second opening degree omega2In which ξ2Indicating a second humidity difference, ξ2∈(0％，ξ1)，ω2∈[40％，60％]；
Xi is a2≥RE(tk) If the opening degree is more than 0, the PLC outputs the analog quantity of the third opening degree value to the electric valve (22), so that the electric valve (22) on the boiler (21) is adjusted to the third opening degree omega3Wherein, ω is3∈(0％，20％]；
If 0 is not less than RE(tk)≥(R1-R2) If so, the PLC outputs the fully-closed analog quantity to the electric valve (22) so as to fully close the electric valve (22) on the boiler (21);
if (R)1-R2)＞RE(tk) Then the PLC controller outputs a fully closed analog quantity to the electric valve, so that the electric valve (22) on the boiler (21) is fully closed, and the rotating speeds of the first axial flow fan (7) and the second axial flow fan (14) are adjusted, so that the rotating speed of the first axial flow fan (7) is higher than that of the second axial flow fan (14), and the rotating speed difference between the first axial flow fan and the second axial flow fan is psi2Wherein ψ2E (600 rpm, 900 rpm);
step 13, if R isE(tk)＞ξ1The PLC outputs the analog quantity of the fourth opening value to the electric valve (22) so that the electric valve (22) on the boiler (21) is adjusted to the fourth opening omega4Wherein, ω is4∈(ω2,ω1)；
Xi is a1≥RE(tk)＞ξ2The PLC outputs the analog quantity of the fifth opening degree value to the electric valve (22) so that the electric valve (22) on the boiler (21) is adjusted to the fifth opening degree omega5Wherein, ω is5∈(ω3,ω2)；
Xi is a2≥RE(tk) If the opening degree is more than 0, the PLC outputs the analog quantity of the sixth opening degree value to the electric valve (22), so that the electric valve (22) on the boiler (21) is adjusted to the sixth opening degree omega6Wherein, ω is6∈(0,ω3)；
If 0 is not less than RE(tk)≥(R1-R2) If so, the PLC outputs the fully-closed analog quantity to the electric valve (22) so as to fully close the electric valve (22) on the boiler (21);
if (R)1-R2)＞RE(tk) Then the PLC controller outputs a fully closed analog quantity to the electric valve (22) to fully close the electric valve (22) on the boiler (21), and adjusts the rotating speeds of the first axial flow fan (7) and the second axial flow fan (14) to enable the rotating speed of the first axial flow fan (7) to be higher than that of the second axial flow fan (14), and the wind speed difference between the first axial flow fan and the second axial flow fan is psi2。
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| CN114246230B (en) | 2023-02-28 |
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