CN114246230B - 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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- CN114246230B CN114246230B CN202111614748.7A CN202111614748A CN114246230B CN 114246230 B CN114246230 B CN 114246230B CN 202111614748 A CN202111614748 A CN 202111614748A CN 114246230 B CN114246230 B CN 114246230B
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Abstract
The invention discloses circulating air type yellow 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 stuffy and yellow more uniformly 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 heating 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 smoldering 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 connecting positions, and the outer surfaces of the box body and all the bent pipes are attached with heat insulation 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 ，T 2 ]Wherein, T 1 Lower limit value of temperature, T 2 Represents an upper limit value of temperature, and T 1 <T 2 (ii) a Set relative humidity to be maintained at [ R ] 1 ，R 2 ]Wherein R is 1 Lower limit of humidity, R 2 Represents an upper limit value of humidity, and R 1 <R 2 (ii) a Setting the dark yellow time as time, setting the sampling period of the temperature and humidity sensor as t, and setting the current kth sampling period as t k Initializing k =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 air return type equipment;
the steam generator is electrically preheated;
the PLC controller calculates the k sampling period t according to the data of each sensor k Temperature difference T E (t k )＝T 1 -T 0 (t k ) Humidity difference R E (t k )＝R 1 -R 0 (t k ) Temperature value T 0 (t k ) Rate of change T of 0C (t k )＝(T 0 (t k )-T 0 (t k-1 ) T, temperature T) L (t k ) Rate of change T of LC (t k )＝(T L (t k )-T L (t k-1 ) T), wherein T 0 (t k-1 ) Represents the k-1 th sampling period t k-1 Setting the temperature value detected by the temperature and humidity sensor; t is a unit of 0 (t k-1 ) Represents the k-1 th sampling period t k-1 When k =1, let T be 0 (t k-1 )＝T 0 (t k )，T L (t k-1 )＝T L (t k )；
If delta 1 ≥T E (t k )＞δ 2 Then step 7 is performed, where δ 2 Is a second temperature difference, and δ 2 ∈(0℃，δ 1 )；
If delta 2 ≥T E (t k ) If the temperature is higher than 0 ℃, executing the step 8;
if 0 is more than or equal to T E (t k )≥(T 1 -T 2 ) Then, determine T 0C Whether 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 T E (t k )＜(T 1 -T 2 ) If yes, executing step 10;
Xi is a 1 ≥R E (t k )＞ξ 2 The PLC outputs the analog quantity of the second opening value to the electric valve, so that the electric valve on the steam generator is adjusted to the second opening omega 2 Wherein xi is 2 Indicating a second humidity difference, ξ 2 ∈(0％，ξ 1 )，ω 2 ∈[40％，60％]；
Xi is a 2 ≥R E (t k ) If the opening degree is larger than 0, the PLC controller outputs the analog quantity of the third opening degree value to the electric valve, so that the electric valve on the steam generator is adjusted to the third opening degree omega 3 Wherein, ω is 3 ∈(0％，20％]；
If 0 is not less than R E (t k )≥(R 1 -R 2 ) If the analog quantity of the full closing is output to the electric valve by the PLC controller, so that the electric valve on the steam generator is fully closed;
if (R) 1 -R 2 )＞R E (t k ) If the steam generator is in a closed state, the PLC outputs a fully-closed analog quantity to the electric valve, so that the electric valve on the steam generator 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 psi 2 Wherein psi 2 E (600 rpm, 900 rpm);
Xi is a 1 ≥R E (t k )＞ξ 2 If the PLC outputs the analog quantity of the fifth opening value to the electric valve, the electric valve on the steam generator is adjusted to the fifth opening omega 5 Wherein, ω is 5 ∈(ω 3 ,ω 2 )；
Xi is a 2 ≥R E (t k ) If the opening degree is more than 0, the PLC controller outputs the analog quantity of the sixth opening degree value to the electric valve, so that the electric valve on the steam generator is adjusted to the sixth opening degree omega 6 Wherein, ω is 6 ∈(0,ω 3 )；
If 0 is not less than R E (t k )≥(R 1 -R 2 ) If the analog quantity of the full closing is output to the electric valve by the PLC controller, so that the electric valve on the steam generator is fully closed;
if (R) 1 -R 2 )＞R E (t k ) If the PLC outputs the analog quantity of full closing to the electric valve, the electric valve on the steam generator is fully closed, the rotating speeds of the first axial flow fan and the second axial flow fan are adjusted, the rotating speed of the first axial flow fan is higher than that of the second axial flow fan, and the air speed difference between the first axial flow fan and the second axial flow fan is psi 2 。
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 a temperature sensor; 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 horizontally-steering bent pipe 8; 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 disposed at the middle position inside the box 4, a temperature sensor 19 is disposed at the tuyere of the second electrothermal furnace 12, and a first wind speed sensor 18 and a second wind speed sensor 20 are disposed in the elbow pipe 8 and the elbow pipe 13, respectively;
as shown in fig. 3, the humidifying pipe 11 is connected to the steam generator 21 via 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 wind energy blown by the two axial flow fans can uniformly circulate in the box 4.
Sealing gaskets are arranged at all connecting positions, and the outer surfaces of the box body 4 and all the bent pipes are attached with heat insulation cotton.
In this embodiment, as shown in fig. 6, a control method of 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 ，T 2 ]Wherein, T 1 Lower limit value of temperature, T 2 Represents an upper limit value of temperature, and T 1 <T 2 (ii) a Set relative humidity to be maintained at [ R ] 1 ，R 2 ]Wherein R is 1 Lower limit of humidity, R 2 Represents an upper limit value of humidity, and R 1 <R 2 (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 t k Initialization k =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 sensor k Temperature difference T E (t k )＝(T 1 -T 0 (t k ) ) difference in humidity R E (t k )＝(R 1 -R 0 (t k ) T), temperature value T 0 (t k ) Rate of change T of 0C (t k )＝(T 0 (t k )-T 0 (t k-1 ) T, temperature T) L (t k ) Rate of change T of LC (t k )＝(T L (t k )-T L (t k-1 ) T), wherein T 0 (t k-1 ) Represents the k-1 th sampling period t k-1 Lower temperatureThe temperature value detected by the humidity sensor 17; t is 0 (t k-1 ) Represents the k-1 th sampling period t k-1 The humidity value detected by the lower temperature/humidity sensor 17 is T when k =1 0 (t k-1 )＝T 0 (t k )，T L (t k-1 )＝T L (t k )；
if the temperature is more than or equal to 3 DEG C E (t k ) If the temperature is higher than 1.5 ℃, executing a step 7;
if the temperature is more than or equal to 1.5 ℃ and T E (t k ) If the temperature is higher than 0 ℃, executing the step 8;
if 0 is more than or equal to T E (t k )≥(T 1 -T 2 ) Then, determine T 0C Whether 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 T is E (t k )＜(T 1 -T 2 ) Then, step 10 is executed;
and 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 circuits to be closed, so that the first electric heating furnace 9 and the second electric heating furnace 12 are electrified and are connected at T LC When the set first temperature change rate is reached to 3 ℃/s, the PLC outputs a disconnection signal to the first electric heating furnace 9 and the second electric heating furnace 12 to control the main line thereofThe contactor on the road is disconnected, so that the first electric heating furnace 9 and the second electric heating furnace 12 are powered off;
and 7, outputting a closing signal to the first electric heating furnace 9 and the second electric heating furnace 12 by the PLC to control the contactors on the main circuits to be closed, so that the first electric heating furnace 9 and the second electric heating furnace 12 are electrified and are connected at T LC When the set second temperature change rate is reached to 2 ℃/s, 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 disconnection of the contactors on the main lines of the first electric heating furnace 9 and the second electric heating furnace 12, so that the first electric heating furnace 9 and the second electric heating furnace 12 are disconnected;
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 of the electric valve 22 at the outlet of the steam generator 21 according to the humidity;
if 15% or more of R E (t k ) 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 valve 22 on the steam generator 21 is adjusted to the second opening degree of 60%;
if 5% or more of R E (t k ) 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 steam generator 21 is adjusted to the third opening degree of 20 percent;
if 0 is not less than R E (t k )≥(R 1 -R 2 ) If the analog quantity is completely closed, the PLC outputs the completely closed analog quantity to the electric valve 22, so that the electric valve 22 on the steam generator 21 is completely closed;
if (R) 1 -R 2 )＞R E (t k ) Then, the PLC controller outputs a fully-closed analog quantity to the electric valve, so that the electric valve 22 on the steam generator 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 an air pressure difference in the box 4, and sucking more fresh air from the feeding port and the discharging port into the circulating air duct to reduce the humidity;
if 15% is greater than or equal to R E (t k ) 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 steam generator 21 is adjusted to the fifth opening degree of 40%;
if 5% is greater than or equal to R E (t k ) 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 steam generator 21 is adjusted to the sixth opening degree of 10 percent;
if 0 is not less than R E (t k )≥(R 1 -R 2 ) If the analog quantity of the full closing is output to the electric valve 22 by the PLC controller, the electric valve 22 on the steam generator 21 is fully closed;
if (R) 1 -R 2 )＞R E (t k ) Then, the PLC controller outputs a fully-closed analog quantity to the electric valve 22, so that the electric valve 22 on the steam generator 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 an air pressure difference in the box 4, and sucking more fresh air from the feeding port and the discharging port into the circulating air duct, thereby reducing the humidity.
Claims (3)
1. A control method based on a circulating air type yellow stewing device for processing yellow tea is characterized in that a box body (4) is arranged on a support 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 motor and reducer module (24) drives a chain wheel and a chain transmission mechanism (25) on the conveying belt (16); a material homogenizing plate (15) is arranged above the conveyor belt (16) below the tea feed port (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 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 a 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);
a temperature and humidity sensor (17) is arranged in the middle of the inner part of the box body (4), a temperature sensor (19) is arranged at a tuyere of the second electric heating 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); the control method 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 ，T 2 ]Wherein, T 1 Lower limit value of temperature, T 2 Represents an upper limit value of temperature, and T 1 <T 2 (ii) a Set relative humidity to be maintained at [ R ] 1 ，R 2 ]Wherein R is 1 Represents the lower limit of humidity, R 2 Represents an upper limit value of humidity, and R 1 <R 2 (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 t k Initialization k =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 kth sampling period t k The temperature and humidity sensor (17) detects a temperature value T 0 (t k ) And a humidity value R 0 (t k ) The temperature sensor (19) detects the temperature T at the second electric heater (12) L (t k ) 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 sensor k Temperature difference T E (t k )＝T 1 -T 0 (t k )、Difference in humidity R E (t k )＝R 1 -R 0 (t k ) Temperature value T 0 (t k ) Rate of change T of 0C (t k )＝(T 0 (t k )-T 0 (t k-1 ) T, temperature T) L (t k ) Rate of change T of LC (t k )＝(T L (t k )-T L (t k-1 ) T), wherein T 0 (t k-1 ) Represents the k-1 th sampling period t k-1 The temperature value detected by the temperature and humidity sensor (17) is measured; t is a unit of 0 (t k-1 ) Represents the k-1 th sampling period t k-1 When k =1, let T be a humidity value detected by the temperature/humidity sensor (17) 0 (t k-1 )＝T 0 (t k )，T L (t k-1 )＝T L (t k )；
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 T L (t k )＜T 2 If yes, executing step 4; otherwise, executing step 9;
step 4, if T LC If less than 0, executing step 5; otherwise, executing step 9;
step 5, if T E (t k )＞δ 1 Then step 6 is performed, where δ 1 Is a first temperature difference, and δ 1 ∈(0℃，5℃]；
If delta 1 ≥T E (t k )＞δ 2 Then step 7 is performed, where δ 2 Is a second temperature difference, and δ 2 ∈(0℃，δ 1 )；
If delta 2 ≥T E (t k ) If the temperature is higher than 0 ℃, executing the step 8;
if 0 is more than or equal to T E (t k )≥(T 1 -T 2 ) Then, determine T 0C Whether the value is more than or equal to 0 is true, if so, executing a step 9; otherwise, executing step 8;
if T E (t k )＜(T 1 -T 2 ) 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 circuits to be closed, so that the first electric heating furnace (9) and the second electric heating furnace (12) are powered on, and the T is provided with a power supply LC Reaches a set first temperature change rate lambda 1 When 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) to control the disconnection of the contactors on the main lines of the first electric heating furnace (9) and the second electric heating furnace (12) so as to disconnect the power of the first electric heating furnace (9) and the second electric heating furnace (12), wherein lambda is 1 E (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 on LC To reach the set second temperature change rate lambda 2 When 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 is 2 E (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 is provided with a power supply LC Reaches the set third temperature change rate lambda 3 When 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 is 3 E (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 main line thereofThe contactor on the road is disconnected, so that the first electric heating furnace (9) and the second electric heating furnace (12) are powered off, 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 psi 1 (ii) a Wherein psi 1 E (600 rpm, 900 rpm);
step 11, if T 0 (t k ) If the temperature is higher than eta, executing the step 12, otherwise, executing the step 13, wherein eta represents a first temperature value, and eta belongs to (40 ℃,45 ℃);
step 12, if R is E (t k )＞ξ 1 The PLC controller outputs the analog quantity of the first opening value to the electric valve (22) so that the electric valve (22) on the steam generator (21) is adjusted to the first opening omega 1 In which ξ 1 Representing a first humidity difference, ξ 1 ∈(0％，15％]，ω 1 ∈[80％，90％]；
If xi 1 ≥R E (t k )＞ξ 2 The PLC outputs the analog quantity of the second opening value to the electric valve (22) so that the electric valve (22) on the steam generator (21) is adjusted to the second opening omega 2 In which ξ 2 Indicating a second humidity difference, ξ 2 ∈(0％，ξ 1 )，ω 2 ∈[40％，60％]；
Xi is a 2 ≥R E (t k ) 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 steam generator (21) is adjusted to the third opening degree omega 3 Wherein, ω is 3 ∈(0％，20％]；
If 0 is not less than R E (t k )≥(R 1 -R 2 ) If the analog quantity of the full closing is output to the electric valve (22) by the PLC controller, the electric valve (22) on the steam generator (21) is fully closed;
if (R) 1 -R 2 )＞R E (t k ) The PLC outputs a fully closed analog quantity to an electric valve, so that the electric valve (22) on the steam generator (21) is fully closed, and the first axial fan (7) and the second axial fan are adjustedThe rotational speed of the axial fan (14) is set so that the rotational speed of the first axial fan (7) is higher than the rotational speed of the second axial fan (14) by a rotational speed difference of psi 2 Wherein ψ 2 E (600 rpm, 900 rpm);
step 13, if R is E (t k )＞ξ 1 The PLC controller outputs the analog quantity of the fourth degree value to the electric valve (22) so that the electric valve (22) on the steam generator (21) is adjusted to the fourth degree omega 4 Wherein, ω is 4 ∈(ω 2 ,ω 1 )；
Xi is a 1 ≥R E (t k )＞ξ 2 The PLC outputs the analog quantity of the fifth opening value to the electric valve (22) so that the electric valve (22) on the steam generator (21) is adjusted to the fifth opening omega 5 Wherein, ω is 5 ∈(ω 3 ,ω 2 )；
Xi is a 2 ≥R E (t k ) 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 steam generator (21) is adjusted to the sixth opening degree omega 6 Wherein, ω is 6 ∈(0,ω 3 )；
If 0 is not less than R E (t k )≥(R 1 -R 2 ) If the analog quantity of the full closing is output to the electric valve (22) by the PLC controller, the electric valve (22) on the steam generator (21) is fully closed;
if (R) 1 -R 2 )＞R E (t k ) Then the PLC controller outputs a fully closed analog quantity to the electric valve (22) to fully close the electric valve (22) on the steam generator (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 psi 2 。
2. The control method of 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 the levels as the conveyor belts (16) are respectively arranged in the air outlet cover (5) and the air return cover (2), and the baffle partitions are uniformly arranged at 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 body (4).
3. The method for controlling a 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 attached with heat preservation cotton.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111614748.7A CN114246230B (en) | 2021-12-27 | 2021-12-27 | Circulating air type yellow-smoldering equipment for processing yellow tea and control method |
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| CN114747639A (en) * | 2022-04-22 | 2022-07-15 | 岳阳市农业农村事务中心(岳阳市农业广播电视学校) | Box-type tea leaf yellowing machine |
| CN116520919B (en) * | 2023-05-08 | 2024-05-14 | 安徽农业大学 | Temperature and humidity decoupling control method of yellow tea processing equipment |
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| CN107165686B (en) * | 2016-03-08 | 2020-03-31 | 中国国电集团公司 | Secondary reheating thermal power generating unit bypass control method and system |
| JP6791583B2 (en) * | 2017-01-13 | 2020-11-25 | パーカーエンジニアリング株式会社 | drying furnace |
| CN108464357A (en) * | 2018-01-30 | 2018-08-31 | 柳城县国营伏虎华侨农场茶厂 | A kind of multi-functional bored yellow case |
| CN108740121B (en) * | 2018-07-24 | 2024-03-08 | 岳阳市农业机械技术推广站（岳阳市农业机械化研究所） | Visual intelligent yellow tea smoldering machine |
| CN109554280A (en) * | 2019-01-18 | 2019-04-02 | 福州隆利信生物制品有限公司 | A kind of aerated koji making Zymolysis Equipment |
| CN210143735U (en) * | 2019-05-23 | 2020-03-17 | 绍兴柯桥寺山茶业有限公司 | System for be used for yellow tea vexation yellow process |
| CN210094536U (en) * | 2019-05-23 | 2020-02-21 | 绍兴柯桥寺山茶业有限公司 | Yellow tea stewing system |
| CN110214831B (en) * | 2019-07-11 | 2023-06-16 | 安徽农业大学 | Yellow tea yellow-sealing equipment and method for automatically controlling yellow-sealing degree thereof |
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