CN105180632A - Drier temperature control method and drier system - Google Patents
Drier temperature control method and drier system Download PDFInfo
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- CN105180632A CN105180632A CN201510705432.7A CN201510705432A CN105180632A CN 105180632 A CN105180632 A CN 105180632A CN 201510705432 A CN201510705432 A CN 201510705432A CN 105180632 A CN105180632 A CN 105180632A
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Abstract
The invention discloses a drier temperature control method and a drier system. A drier is communicated with a hot-blast stove through a pipeline, the drier is provided with an air draft mechanism, a first temperature sensor is arranged in the pipeline and outputs a sensing signal to a controller, the controller outputs a control signal to the air draft mechanism, a second temperature sensor is arranged in the drier, and the second temperature sensor outputs a sensing signal to the controller. According to the method, the temperature sensors are additionally arranged near the heat exchange position, variable-frequency speed control is conducted on an air draft motor through a frequency converter, and closed-loop control of temperature in the drying process is achieved finally; control precision is improved, and constant-temperature control can be conducted on different types of grain to achieve the optimal drying efficiency.
Description
Technical field
The present invention relates to grain drying machine field, particularly relate to control system and the control method thereof of the inner bake out temperature of dryer.
Background technology
Grain drying machine is a kind of assembly of dryer, it is the general designation of the various equipment of foodstuff drying device, also can become is foodstuff drying device, and temperature is the key factor in dryer control procedure, and dryer directly determines the quality of grain-drying to temperature controlled quality.
At present, dryer thermal source is on the market complicated, the thermal source that existing high temperature furnace etc. are raw material with coal or natural gas, also combustor etc. is had to take oil as the thermal source of raw material, the thermal source that the control system more having shower furnace such is comparatively perfect, for different thermals source, main in dryer control procedure what gather is the temperature of hot-air mouth, directly can not reflect the temperature in drying course; The system temperature collected on the one hand is near heating sources hot-air mouth temperature, for the baking temperature in dry run, does not reflect intuitively; In addition on the one hand mainly by control of heat source fuel number or intake number carry out control of heat source temperature, control effects is poor, and temperature back and forth wave phenomenon is obvious.
Summary of the invention
Technical problem to be solved by this invention be realize a kind of can constant control bake out temperature, improve the accurate temperature controlled dryer system of drying efficiency.
To achieve these goals, the technical solution used in the present invention is:
A kind of dryer temperature-controlled process:
For gather connect dryer and hot-blast stove pipeline in and the step of real time temperature in dryer;
For comparing the comparison step of gathered real time temperature and preset temperature;
For controlling the rate-determining steps of air draft mechanism rotating speed according to the comparative result of described real time temperature and described preset temperature.
In described rate-determining steps: if described real time temperature is lower than described preset temperature, reduce described air draft mechanism rotating speed; If described real time temperature raises described air draft mechanism rotating speed higher than described preset temperature.
In the comparison step, described preset temperature is T1, T1=kaTa1+kbTb1, wherein ka is the temperature coefficient in described pipeline, and kb is the temperature coefficient in dryer, Ta1 is the target control temperature in pipeline, Ta2 is the target control temperature in dryer, to gather real time temperature be T, T=kaTa+kbTb, wherein in pipeline, real time temperature is Ta, and in dryer, real time temperature is Tb.
The collection position of the real time temperature gathered in described dryer is the neighbouring position of the heat exchange point in dryer.
Described rate-determining steps also comprises: if real time temperature is lower than preset temperature, outputs control signals to hot-blast stove and improves heating-up temperature, if real time temperature is higher than preset temperature, outputs control signals to hot-blast stove and reduces heating-up temperature.
A kind of dryer temperature controller, described temperature controller comprises:
For gather connect dryer and hot-blast stove pipeline in and the input block of real time temperature in dryer;
For comparing the comparing unit of gathered real time temperature and preset temperature;
For controlling the control unit of air draft mechanism rotating speed according to the comparative result of described real time temperature and described preset temperature.
A kind of dryer temperature control system, dryer is communicated with hot-blast stove by pipeline, described dryer is provided with air draft mechanism, described dryer temperature control system comprises dryer temperature controller according to claim 6, described controller receives the real time temperature signal of the first temperature sensor be arranged in pipeline, and being arranged on the real time temperature signal of the second temperature sensor in drying mechanism, described controller outputs control signals to air draft mechanism according to gathered real time temperature signal with after preset temperature.
The motor of described air draft mechanism connects power supply through frequency converter, and described controller outputs control signals to frequency converter.
Described controller output temperature conditioning signal is to hot-blast stove.
The first described temperature sensor is positioned at pipeline one end near hot-blast stove, and the second described temperature sensor is positioned at the neighbouring position of the heat exchange point of drying mechanism.
A kind of dryer, comprise drying machine body, described drying machine body comprises the dryer temperature control system described in claim 7-10.
The mode that the present invention adopts is reload temperature sensor near heat exchange sites, and realize the variable frequency regulating speed control to exhausting motor by frequency converter, final realization is to the closed-loop control of temperature in dry run, improve its control accuracy, and can for different grain species, thermostatic control reaches best drying efficiency.
Accompanying drawing explanation
Mark in the content expressed every width accompanying drawing in description of the present invention below and figure is briefly described:
Fig. 1 is accurate temperature controlled dryer system structural representation;
Fig. 2 is dryer temperature-controlled process flow chart;
Fig. 3 first temperature sensor location ideal temperature change curve schematic diagram;
Mark in above-mentioned figure is: 1, dryer; 2, pipeline; 3, hot-blast stove; 4, air draft mechanism; 5, the first temperature sensor; 6, the second temperature sensor.
Detailed description of the invention
Dryer generally comprises air draft mechanism 4, hot-blast stove 3 and dryer 1, wherein dryer 1 is communicated with hot-blast stove 3 by pipeline 2, hot-blast stove 3 is for drying thermal source, by pipeline 2, hot blast is delivered in dryer 1, dryer 1 is for taking up cereal to be dried, air draft mechanism 4 is communicated with dryer 1 by pipeline, air draft mechanism 4 is the hot blast power source of drying thermal source, cereal in dryer 1 and hot blast carry out exchange heat by steel construction, thus reduction cereal moisture percentage, hot blast after heat exchange, by air draft mechanism 4, is discharged dryer 1 and is got back in air.
As shown in Figure 1, the present invention is provided with the first temperature sensor 5 in pipeline 2, and in dryer 1, be provided with the second temperature sensor 6, the main testing pipes 2 endogenous pyrogen temperature of first temperature sensor 5, for the heat exchanging process of cereal, heat source temperature has a certain impact, but it is direct not, for the drying efficiency improving cereal, the stability influence of heat source temperature neither be clearly, what the second temperature sensor 6 gathered is the temperature of grain fever switch, for the temperature of practical function on cereal, first temperature sensor 5 and the second temperature sensor 6 all export induced signal to controller, detected by the cooperation of the first temperature sensor 5 and the second temperature sensor 6, then can detect the thermal source of whole drying system and the temperature parameter of drying area, be convenient to the work of controller coordinate dryer.
Regulate temperature for ease of controller, the motor of air draft mechanism 4 connects power supply through frequency converter, and controller outputs control signals to frequency converter, by the adjustment air quantity that frequency converter can be electrodeless, is convenient to control bake out temperature more accurately.With Time Controller output temperature conditioning signal to hot-blast stove 3, also thermal source is controlled simultaneously, finally reach good drying effect.
The controller processing module of above-mentioned drying system, processing module is used for the process of signal, by the signal of material
Dryer system is provided with one for coordinating the controller of all parts work, this controller is provided with processing module, processing module is used for exporting control signal according to the signal transacting received, processing module is provided with the signal output interface connecting air draft mechanism frequency converter, the signal output interface connecting hot-blast stove, for exporting control signal, and be at least provided with two for connecting the signal input interface of temperature sensor, for receiving temperature signal.
Based on above-mentioned hardware system, see Fig. 2, dryer temperature-controlled process of the present invention is as follows:
Step 1, dryer start, and start post-drying machine and carry out preheating process, the pre-warmed time is self-defined according to the volume of thermal source and dryer 1, and preheating process temperature promotes gradually until stable, and this stage does not carry out temperature adjustment and detection;
Real time temperature signal is delivered to controller by step 2, temperature sensor, is compared by real-time temperature values with preset temperature;
If step 3 real time temperature is lower than preset temperature, controller outputs control signals to frequency converter and reduces motor speed, if real time temperature is higher than preset temperature, controller outputs control signals to frequency converter and improves motor speed;
Above-mentioned preset temperature is T1, T1=kaTa1+kbTb1, wherein ka is the temperature coefficient of the first temperature sensor 5 position, kb is the temperature coefficient of the second temperature sensor 6 position, and Ta1 is the first temperature sensor 5 Place object control temperature, and Ta2 is the second temperature sensor 6 Place object control temperature, the real time temperature that sensor exports is T, T=kaTa+kbTb, wherein the first temperature sensor 5 real time temperature is Ta, and the real-time temperature of the second temperature sensor 6 is Tb.Target control temperature compares with real time temperature, and by Frequency Converter Control air exhauster rotating speed, realizes closed-loop control.Wherein temperature coefficient ka and kb presets, for regulating the weight of two temperature sensors according to the size of product component and power.
In addition, this step also has following steps: if real time temperature is lower than preset temperature, and controller outputs control signals to hot-blast stove 3 and improves heating-up temperature, if real time temperature is higher than preset temperature, controller outputs control signals to hot-blast stove 3 and reduces heating-up temperature, by auxiliary control of heat source temperature, finally reach good drying effect;
Step 4, return step 2.
The present invention also protects a kind of dryer, and dryer comprises drying machine body, and this drying machine body comprises air draft mechanism 4, hot-blast stove 3 and dryer 1, and this drying machine body is provided with above-mentioned accurate temperature controlled dryer system.
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.
Claims (10)
1. a dryer temperature-controlled process, is characterized in that:
For gather connect dryer and hot-blast stove pipeline in and the step of real time temperature in dryer;
For comparing the comparison step of gathered real time temperature and preset temperature;
For controlling the rate-determining steps of air draft mechanism rotating speed according to the comparative result of described real time temperature and described preset temperature.
2. dryer temperature-controlled process according to claim 1, is characterized in that: in described rate-determining steps: if described real time temperature is lower than described preset temperature, reduces described air draft mechanism rotating speed; If described real time temperature raises described air draft mechanism rotating speed higher than described preset temperature.
3. dryer temperature-controlled process according to claim 3, it is characterized in that: in the comparison step, described preset temperature is T1, T1=kaTa1+kbTb1, wherein ka is the temperature coefficient in described pipeline, kb is the temperature coefficient in dryer, and Ta1 is the target control temperature in pipeline, and Ta2 is the target control temperature in dryer, to gather real time temperature be T, T=kaTa+kbTb, wherein in pipeline, real time temperature is Ta, and in dryer, real time temperature is Tb.
4. dryer temperature-controlled process according to claim 3, is characterized in that: the collection position of the real time temperature gathered in described dryer is the neighbouring position of the heat exchange point in dryer.
5. the dryer temperature-controlled process according to claim 1 or 4, it is characterized in that: described rate-determining steps also comprises: if real time temperature is lower than preset temperature, output control signals to hot-blast stove and improve heating-up temperature, if real time temperature is higher than preset temperature, outputs control signals to hot-blast stove and reduce heating-up temperature.
6. a dryer temperature controller, is characterized in that: described temperature controller comprises:
For gather connect dryer and hot-blast stove pipeline in and the input block of real time temperature in dryer;
For comparing the comparing unit of gathered real time temperature and preset temperature;
For controlling the control unit of air draft mechanism rotating speed according to the comparative result of described real time temperature and described preset temperature.
7. a dryer temperature control system, dryer is communicated with hot-blast stove by pipeline, described dryer is provided with air draft mechanism, it is characterized in that: described dryer temperature control system comprises dryer temperature controller according to claim 6, described controller receives the real time temperature signal of the first temperature sensor be arranged in pipeline, and being arranged on the real time temperature signal of the second temperature sensor in drying mechanism, described controller outputs control signals to air draft mechanism according to gathered real time temperature signal with after preset temperature.
8. dryer temperature control system according to claim 7, it is characterized in that: the motor of described air draft mechanism connects power supply through frequency converter, described controller outputs control signals to frequency converter.
9. the dryer temperature control system according to claim 7 or 8, it is characterized in that: described controller output temperature conditioning signal is to hot-blast stove, the first described temperature sensor is positioned at pipeline one end near hot-blast stove, and the second described temperature sensor is positioned at the neighbouring position of the heat exchange point of drying mechanism.
10. a dryer, comprises drying machine body, it is characterized in that: described drying machine body comprises the dryer temperature control system described in claim 7-10.
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| CN201510705432.7A CN105180632B (en) | 2015-10-26 | 2015-10-26 | Dryer temprature control method and its dryer system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105890329A (en) * | 2016-05-06 | 2016-08-24 | 湖南省农友盛泰农业科技有限公司 | Temperature regulating method based on PID control, for grain drying machine, and control device |
| CN107318976A (en) * | 2017-08-08 | 2017-11-07 | 常州天能博智能系统科技有限公司 | A kind of grain-drying system and household energy conserving system based on server waste heat |
| CN109974395A (en) * | 2017-12-27 | 2019-07-05 | 山东琦泉能源科技有限公司 | Biomass material drying means |
| CN110094944A (en) * | 2019-05-07 | 2019-08-06 | 中联重机股份有限公司 | A kind of batch microwave grain drier and drying means |
| CN116951747A (en) * | 2023-06-27 | 2023-10-27 | 广东广业云硫矿业有限公司 | Control device and method for phosphate fertilizer hot blast stove |
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| CN109974395A (en) * | 2017-12-27 | 2019-07-05 | 山东琦泉能源科技有限公司 | Biomass material drying means |
| CN110094944A (en) * | 2019-05-07 | 2019-08-06 | 中联重机股份有限公司 | A kind of batch microwave grain drier and drying means |
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| CN116951747A (en) * | 2023-06-27 | 2023-10-27 | 广东广业云硫矿业有限公司 | Control device and method for phosphate fertilizer hot blast stove |
| CN116951747B (en) * | 2023-06-27 | 2024-01-23 | 广东广业云硫矿业有限公司 | Control device and method for phosphate fertilizer hot blast stove |
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| CN105180632B (en) | 2018-02-13 |
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Address after: 241080 16 e - Xi Road, San Shan Economic Development Zone, Wuhu, Anhui Patentee after: Zhonglian Agricultural Machinery Co., Ltd Address before: 241080, No. 16, Wuhu Road, three mountain Economic Development Zone, three mountain area, Anhui, China Patentee before: ZOOMLION HEAVY MACHINERY Co.,Ltd. |