CN114394773A - Temperature control method, device and system and material frying system - Google Patents
Temperature control method, device and system and material frying system Download PDFInfo
- Publication number
- CN114394773A CN114394773A CN202111527729.0A CN202111527729A CN114394773A CN 114394773 A CN114394773 A CN 114394773A CN 202111527729 A CN202111527729 A CN 202111527729A CN 114394773 A CN114394773 A CN 114394773A
- Authority
- CN
- China
- Prior art keywords
- temperature
- rotary kiln
- steam valve
- temperature control
- control method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/02—Methods and apparatus for dehydrating gypsum
- C04B11/028—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained
- C04B11/0285—Rotary kilns
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
A temperature control method, a device and a system and a stir-frying system are provided. The temperature control method comprises the following steps: acquiring the temperature of the middle part and the tail part of the rotary kiln; and controlling the opening degree of the steam valve according to the temperatures of the middle part and the tail part of the rotary kiln. The temperature control method provided by the embodiment of the application can automatically control the opening degree of the steam valve according to the temperatures of the middle part and the tail part of the rotary kiln, and manual intervention control is not needed, so that the convenience of material control is improved, the working strength of workers is reduced, and the automation degree of a factory is improved.
Description
Technical Field
The present invention relates to a gypsum board production line control technology, in particular, it relates to a temperature control method, temperature control device, temperature control system and material-frying system of gypsum board production line.
Background
In the gypsum board production line, a steam rotary kiln material frying system is a key raw material process of the gypsum board production line. The rotary kiln is used as key equipment for frying the desulfurized gypsum and is a carrier for directly heating and frying the steam and the desulfurized gypsum. The control of the frying temperature and the frying effect are key factors for judging whether the fried gypsum powder meets the requirements or not. However, because the desulfurized gypsum directly enters the rotary kiln and is heated by mutual contact with the steam coil pipe, the desulfurized gypsum is gradually conveyed forwards in the process of slow rotation of the rotary kiln, the frying temperature is the best control on the material frying effect in the process, the content of calcined gypsum crystal water in the fried material is directly influenced by the frying temperature, and the crystal water is a key index for measuring the material frying effect. The rotary kiln is a large-scale material frying device, the temperature feedback is slow, the frying temperature is improved by controlling the opening degree of the steam valve to improve the heat supply while changing according to the frying temperature, the reaction is very slow, the process is basically controlled by manual intervention, and the steam valve is gradually opened and closed according to the temperature change, so that the inconvenience and the rapidness of material control are caused, and the manual work intensity is increased. These problems are all problems often encountered with rotary kiln systems.
This problem is also a common problem encountered in some current gypsum board manufacturing plants that use steam heat sources. This is a problem in the current technology and a disadvantage in the current technology.
Disclosure of Invention
The embodiment of the application provides a temperature control method, can realize the automatic control of stir-fry material temperature, utilizes automation to replace the manual work, has reduced the drawback of human error, has also promoted the promotion of whole automated control level, and whole result of use is better.
The embodiment of the application provides a temperature control method, which is used for a material frying system of a gypsum board production line, wherein the material frying system comprises a rotary kiln and a steam valve connected with a steam inlet of the rotary kiln, and the temperature control method comprises the following steps: acquiring the temperature of the middle part and the tail part of the rotary kiln; and controlling the opening degree of the steam valve according to the temperatures of the middle part and the tail part of the rotary kiln.
Compared with the prior art, the temperature control method provided by the embodiment of the application can automatically control the opening degree of the steam valve according to the temperatures of the middle part and the tail part of the rotary kiln, and manual intervention control is not needed, so that the convenience of material control is improved, the working strength of workers is reduced, and the automation degree of a factory is favorably improved.
Compare in original manual operation, this scheme utilization is automatic to be replaced the manual work, and is more convenient, and can reduce the drawback that manual operation leads to the error, and whole result of use is better. Compared with the method for controlling the opening of the steam valve according to the temperature of the feed opening of the rotary kiln independently, the method has the advantages that the temperature in the middle of the rotary kiln and the temperature at the tail of the rotary kiln are used as the control basis of the opening of the steam valve, so that the actual frying temperature in the rotary kiln can be reflected accurately, the influence of temperature change lag is reduced, and the temperature control accuracy is improved.
In an exemplary embodiment, the controlling the opening degree of the steam valve according to the temperatures of the middle part and the tail part of the rotary kiln includes: determining temperature estimated values according to the temperatures of the middle part and the tail part of the rotary kiln; and controlling the opening of the steam valve according to the estimated temperature value.
In an exemplary embodiment, the determining the estimated temperature based on the temperatures of the middle and the tail of the rotary kiln includes: calculating and determining the estimated temperature value according to the following calculation formula; the calculation formula is as follows: d ═ a × a% + B × B%; wherein D is the estimated temperature value, A is the temperature of the middle part of the rotary kiln, and B is the temperature of the tail part of the rotary kiln.
In an exemplary embodiment, a-40 and b-60 are provided.
In an exemplary embodiment, said controlling the opening of said steam valve based on said temperature estimate comprises: when the estimated temperature value is greater than a first set temperature, controlling the opening degree of the steam valve to be reduced; when the estimated temperature value is smaller than a second set temperature, controlling the opening of the steam valve to increase; when the temperature estimation value is between the second set temperature and the first set temperature, controlling the opening degree of the steam valve to be kept unchanged; wherein the first set temperature is greater than the second set temperature.
In an exemplary embodiment, the first set temperature is: the temperature of a feed opening of the rotary kiln is controlled when the content of crystal water of the gypsum raw material after frying is 5.5%; the second set temperature is: and when the content of the crystal water of the gypsum raw material after frying is 6%, the temperature of a feed opening of the rotary kiln is controlled.
In an exemplary embodiment, the temperature control method further includes: and acquiring the temperature of the feed opening of the rotary kiln.
The embodiment of the application also provides a temperature control device, which is used for a gypsum board production line, and the temperature control device comprises a processor and a memory stored with a computer program, wherein the processor executes the computer program to realize the steps of the temperature control method in any one of the above embodiments.
The embodiment of the application also provides a stir-frying system of a gypsum board production line, which comprises the temperature control device in the embodiment.
The embodiment of the application still provides a temperature control system for the fried material system of gypsum board production line, fry the material system include the rotary kiln and with the steam valve that the steam inlet of rotary kiln links to each other, temperature control system includes: the first temperature measuring element is arranged for detecting the temperature of the middle part of the rotary kiln; the second temperature measuring element is arranged for detecting the temperature of the tail part of the rotary kiln; and the controller is electrically connected with the first temperature measuring element and the second temperature measuring element and is arranged to control the opening degree of the steam valve according to the temperatures of the middle part and the tail part of the rotary kiln.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.
Drawings
The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
FIG. 1 is a schematic flow chart of a temperature control method according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of a portion of a gypsum board production line provided in accordance with an embodiment of the present application;
fig. 3 is a schematic diagram of a temperature control system according to an embodiment of the present application.
Wherein the reference numerals are:
the method comprises the following steps of (1) a rotary kiln, 2 a steam valve, 3 a first temperature measuring element, 4 a second temperature measuring element, 5 a third temperature measuring element and 6 a steam supply pipeline;
91 a first control valve, 92 a second control valve, 93 a heat exchanger, 94 a regenerative fan, 95 a silencer and 96 a fourth temperature measuring element;
201 belt conveyer, 202 double-screw feeder, 203 screw conveyer, 204 zipper machine, 205 bucket elevator;
301 head discharger, 302 middle discharger, 303 tail discharger, and 304 airlock discharger.
Detailed Description
The present application describes embodiments, but the description is illustrative rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or instead of any other feature or element in any other embodiment, unless expressly limited otherwise.
The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in this application may also be combined with any conventional features or elements to form a unique inventive concept as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive aspects to form yet another unique inventive aspect, as defined by the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not limited except as by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.
Further, in describing representative embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other orders of steps are possible as will be understood by those of ordinary skill in the art. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Further, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present application.
As shown in fig. 1, one embodiment of the present application provides a temperature control method for a frying system of a gypsum board production line. The frying system comprises a rotary kiln 1 and a steam valve 2 connected with a steam inlet of the rotary kiln 1. The rotary kiln 1 is used for frying gypsum raw materials. The steam valve 2 is used for controlling the on-off between the steam supply pipeline 6 and the steam inlet of the rotary kiln 1 and controlling the supply amount of the steam.
The temperature control method comprises the following steps:
step S102: acquiring the temperature of the middle part and the tail part of the rotary kiln;
step S104: and controlling the opening degree of the steam valve according to the temperatures of the middle part and the tail part of the rotary kiln.
The temperature control method provided by the embodiment of the application can automatically control the opening degree of the steam valve 2 according to the temperatures of the middle part and the tail part of the rotary kiln 1 without manual intervention control, thereby improving the convenience of material control, reducing the working strength of workers and being beneficial to improving the automation degree of a factory.
Compare in original manual operation, this scheme utilization is automatic to be replaced the manual work, and is more convenient, and can reduce the drawback that manual operation leads to the error, and whole result of use is better. Compared with the method for controlling the opening of the steam valve 2 according to the temperature of the feed opening of the rotary kiln 1, the method has the advantages that the temperature of the middle part and the temperature of the tail part of the rotary kiln 1 are used as the control basis of the opening of the steam valve 2, so that the actual frying temperature in the rotary kiln 1 can be reflected accurately, the influence of temperature change lag can be reduced, and the temperature control accuracy can be improved.
The temperature of the middle part of the rotary kiln 1 can be the material temperature of the middle part of the rotary kiln 1, the temperature of the middle part of the rotary kiln 1 and the temperature of a steam heat exchange pipe of the middle part of the rotary kiln 1, and the position of a middle temperature measuring point can be reasonably arranged according to requirements in the actual production process. Such as: the middle part of the rotary kiln 1 is provided with a middle discharger 302, a middle temperature measuring point can be arranged on the middle discharger 302, and the material temperature of the middle discharger 302 is taken as the temperature of the middle part of the rotary kiln 1.
Similarly, the temperature of the tail of the rotary kiln 1 can be the temperature of the material at the tail of the rotary kiln 1, the temperature of the tail of the rotary kiln 1 and the temperature of the steam heat exchange pipe at the tail of the rotary kiln 1, and the position of a tail temperature measuring point can be reasonably arranged according to needs in the actual production process. Such as: the tail of the rotary kiln 1 is provided with a tail discharger 303, a tail temperature measuring point can be arranged on the tail discharger 303, and the material temperature of the tail discharger 303 is used as the temperature of the tail of the rotary kiln 1.
In an exemplary embodiment, the opening degree of the steam valve 2 is controlled according to the temperatures of the middle and the tail of the rotary kiln 1, and comprises:
determining temperature estimated values according to the temperatures of the middle part and the tail part of the rotary kiln 1;
the opening of the steam valve 2 is controlled on the basis of the temperature estimate.
Firstly, conversion analysis is carried out according to the temperature of the middle part and the temperature of the tail part of the rotary kiln 1, so that the estimated temperature value (also called as the stir-frying temperature process value) can be determined, and the actual temperature of the tail part of the rotary kiln 1 can be estimated. Then the opening degree of the steam valve 2 is directly controlled according to the temperature estimated value, the logic is reasonable, comparison with two temperatures is not needed, and the simplification of an electric control program is facilitated.
In one example, the opening of the steam valve 2 is controlled using a PID algorithm.
In an exemplary embodiment, determining the estimated temperature based on the temperatures of the middle and tail portions of the rotary kiln 1 includes:
calculating and determining an estimated temperature value according to the following calculation formula;
the calculation formula is as follows: d ═ a × a% + B × B%; wherein D is the estimated temperature value, A is the temperature of the middle part of the rotary kiln 1, and B is the temperature of the tail part of the rotary kiln 1.
The temperature estimated value is directly calculated according to a calculation formula, so that the electric control program is more favorably simplified. In the calculation formula of the temperature estimation value, the temperature of the middle part and the temperature of the tail part of the rotary kiln 1 respectively account for a certain proportion, and the specific proportion can be reasonably set as required.
In one exemplary embodiment, a-40 and b-60.
Through test analysis, the relation between the middle temperature and the tail temperature of the rotary kiln 1 and the change of the crystal water content of the fried calcined gypsum is combined, the proportion of the middle temperature is set to be 40%, the proportion of the tail temperature is set to be 60%, and the obtained temperature estimation value is ideal. The opening degree of the steam valve 2 is controlled according to the estimated temperature value, and the content of the crystal water of the finally obtained plaster is ideal.
Such as: when a is 120 ℃ and B is 100 ℃, the estimated temperature value D is 120 ℃x40% +100 ℃x60% + 108 ℃.
Of course, the values of a and b in the calculation formula are not limited to the above values, and may be adjusted as needed.
In an exemplary embodiment, controlling the opening of the steam valve 2 based on the temperature estimation includes:
when the estimated temperature value is greater than the first set temperature, controlling the opening degree of the steam valve 2 to be reduced;
when the estimated temperature value is less than the second set temperature, controlling the opening degree of the steam valve 2 to increase;
when the estimated temperature value is between the second set temperature and the first set temperature, the opening degree of the steam valve 2 is controlled to be constant.
Wherein the first set temperature is greater than the second set temperature.
When the estimated temperature value is greater than the first set temperature, it indicates that the temperature of the rotary kiln 1 is relatively high, and therefore the opening of the steam valve 2 is controlled to be reduced to reduce the supply amount of steam, so that the temperature in the rotary kiln 1 can be lowered.
When the estimated temperature value is less than the second set temperature, it indicates that the temperature of the rotary kiln 1 is low, and therefore the opening degree of the steam valve 2 is controlled to be increased to increase the steam supply amount so that the temperature in the rotary kiln 1 can be increased.
When the estimated temperature value is between the second set temperature and the first set temperature (i.e., greater than or equal to the second set temperature and less than or equal to the first set temperature), it indicates that the temperature of the rotary kiln 1 is proper, and at this time, the opening degree of the steam valve 2 is kept unchanged.
In other words, the interval between the second set temperature and the first set temperature is an interval in which the temperature of the rotary kiln 1 is not adjusted. This corresponds to setting a dead zone control for the temperature of the rotary kiln 1 as shown in fig. 2. When the dead zone is reached, the steam valve 2 does not act, the current state is kept, and PID algorithm control is not carried out; only when the temperature is outside the dead zone, the PID algorithm control is carried out, and the steam valve 2 can act to regulate the temperature of the rotary kiln 1.
Such as: the set material frying temperature is 110 ℃, the dead zone is 5 ℃, the first set temperature is 115 ℃, and the second set temperature is 105 ℃. When the estimated material temperature is lower than 105 ℃, the opening degree of the steam valve 2 is automatically increased through program detection; when the estimated material temperature is higher than 115 ℃, the opening degree of the steam valve 2 is automatically reduced through program detection.
In an exemplary embodiment, the first set temperature is: the temperature of the feed opening of the rotary kiln 1 when the crystal water content of the gypsum raw material after the frying is 5.5 percent. The second set temperature is: the temperature of the feed opening of the rotary kiln 1 when the crystal water content of the gypsum raw material after the frying is 6 percent.
Research shows that when the crystal water content of the gypsum raw material (namely the calcined gypsum) after the stir-frying is 5.5 to 6 percent, the performance of the prepared gypsum board is better. Therefore, the first set temperature is set to the temperature of the feed opening of the rotary kiln 1 when the crystal water content is 5.5%, and the second set temperature is set to the temperature of the feed opening of the rotary kiln 1 when the crystal water content is 6%, so that the crystal water content of the gypsum raw material obtained after stir-frying is in the range of 5.5% to 6%, and the crystal water is prevented from being abnormal.
Wherein, the temperature of the feed opening of the rotary kiln 1 can be the material temperature at the feed opening. Such as: the tail of the rotary kiln 1 is provided with a tail discharger 303, the outlet of the tail discharger 303 is a feed opening of the rotary kiln 1, a temperature measuring point is arranged at the feed opening, and the measured material temperature is the temperature of the feed opening of the rotary kiln 1.
The specific values of the first set temperature and the second set temperature can be obtained by detection in the production process or the experimental process.
Of course, the first set temperature and the second set temperature may be set to other temperature values as needed.
In an exemplary embodiment, the temperature control method further comprises: the temperature of the feed opening of the rotary kiln 1 is obtained.
The temperature of the feed opening of the rotary kiln 1 is detected, so that the actual temperature of the fried gypsum raw material can be conveniently and timely known by workers. The actual temperature and the temperature estimated value are subjected to reference and proofreading for comparison, so that a calculation formula of the temperature estimated value is conveniently and reasonably adjusted, and the accuracy of temperature control is further improved.
In an exemplary embodiment, a first hot air inlet is provided at the middle of the rotary kiln 1, and a second hot air inlet is provided at the tail of the rotary kiln 1. The first hot air inlet is connected to a first control valve 91, and the second hot air inlet is connected to a second control valve 92, as shown in fig. 3. The temperature control method further includes:
the opening degree of the first control valve 91 and the second control valve 92 is controlled according to the temperature of the middle part and the tail part of the rotary kiln 1.
The first hot air inlet can convey hot air to the middle of the rotary kiln 1, and then the temperature of the middle of the rotary kiln 1 is adjusted. The second hot air inlet can convey hot air to the tail part of the rotary kiln 1, so that the temperature of the tail part of the rotary kiln 1 is adjusted. Thus, by controlling the opening degree of the first control valve 91 and the second control valve 92, the hot air quantity fed to the middle part and the tail part of the rotary kiln 1 can be adjusted, and the frying temperature of the rotary kiln 1 can be further adjusted.
Wherein, the hot air delivered to the rotary kiln 1 may be: hot air generated by the waste heat of the condensed water output by the rotary kiln 1 is utilized to improve the utilization rate of the waste heat and reduce energy waste.
The embodiment of the present application further provides a temperature control device, which is used in a gypsum board production line, and the temperature control device includes a processor and a memory storing a computer program, and when the processor executes the computer program, the steps of the temperature control method in any of the above embodiments are implemented, so that all the beneficial effects of any of the above embodiments are achieved, and are not described herein again.
The processor may be an integrated circuit chip having signal processing capabilities. The Processor may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The embodiment of the application also provides a stir-frying system of a gypsum board production line, which comprises the temperature control device of the embodiment, so that all the beneficial effects of any embodiment are achieved, and the detailed description is omitted.
The embodiment of the application also provides a temperature control system for the frying system of the gypsum board production line. The frying system comprises a rotary kiln 1 and a steam valve 2 connected with a steam inlet of the rotary kiln 1. The temperature control system includes: a first temperature measuring element 3, a second temperature measuring element 4 and a controller.
Wherein the first temperature measuring element 3 is arranged to detect the temperature in the middle of the rotary kiln 1. The second temperature measuring element is arranged to detect the temperature of the tail of the rotary kiln 1. The controller is electrically connected with the first temperature measuring element 3 and the second temperature measuring element 4 and is set as follows: the opening degree of the steam valve 2 is controlled according to the temperature of the middle part and the tail part of the rotary kiln 1.
The temperature control system that this application embodiment provided has increased the temperature measurement point at rotary kiln 1 middle part and afterbody, can come automatic control steam valve 2's aperture according to the temperature of rotary kiln 1 middle part and afterbody, need not artificial intervention control to improve the convenience of accuse material, reduced workman's working strength, be favorable to improving the degree of automation of mill.
Compare in original manual operation, this scheme utilization is automatic to be replaced the manual work, and is more convenient, and can reduce the drawback that manual operation leads to the error, and whole result of use is better. Compared with the method for controlling the opening of the steam valve 2 according to the temperature of the feed opening of the rotary kiln 1, the method has the advantages that the temperature of the middle part and the temperature of the tail part of the rotary kiln 1 are used as the control basis of the opening of the steam valve 2, so that the actual frying temperature in the rotary kiln 1 can be reflected accurately, the influence of temperature change lag can be reduced, and the temperature control accuracy can be improved.
In one example, the controller is a PID (proportional, Integral, derivative) controller, which performs PID control adjustment on the frying temperature.
In an exemplary embodiment, the controller is configured to: and determining temperature estimated values according to the temperatures of the middle part and the tail part of the rotary kiln 1, and controlling the opening degree of the steam valve 2 according to the temperature estimated values.
Firstly, conversion analysis is carried out according to the temperature of the middle part and the temperature of the tail part of the rotary kiln 1, so that the estimated temperature value can be determined, and the actual temperature of the tail part of the rotary kiln 1 can be estimated. Then the opening degree of the steam valve 2 is directly controlled according to the temperature estimated value, the logic is reasonable, comparison with two temperatures is not needed, and the simplification of an electric control program is facilitated.
In an exemplary embodiment, the controller is configured to: the temperature estimation value is determined by calculation according to the following calculation formula.
The calculation formula is as follows: d ═ a × a% + B × B%. Wherein D is the estimated temperature value, A is the temperature of the middle part of the rotary kiln 1, and B is the temperature of the tail part of the rotary kiln 1.
The temperature estimated value is directly calculated according to a calculation formula, so that the electric control program is more favorably simplified. In the calculation formula of the temperature estimation value, the temperature of the middle part and the temperature of the tail part of the rotary kiln 1 respectively account for a certain proportion, and the specific proportion can be reasonably set as required.
In one exemplary embodiment, a-40 and b-60.
Through test analysis, the relation between the middle temperature and the tail temperature of the rotary kiln 1 and the change of the crystal water content of the fried calcined gypsum is combined, the proportion of the middle temperature is set to be 40%, the proportion of the tail temperature is set to be 60%, and the obtained temperature estimation value is ideal. The opening degree of the steam valve 2 is controlled according to the estimated temperature value, and the content of the crystal water of the finally obtained plaster is ideal.
Such as: when a is 120 ℃ and B is 100 ℃, the estimated temperature value D is 120 ℃x40% +100 ℃x60% + 108 ℃.
Of course, the values of a and b in the calculation formula are not limited to the above values, and may be adjusted as needed.
In an exemplary embodiment, the controller is configured to: when the estimated temperature value is greater than the first set temperature, controlling the opening degree of the steam valve 2 to be reduced;
when the estimated temperature value is less than the second set temperature, controlling the opening degree of the steam valve 2 to increase;
when the estimated temperature value is between the second set temperature and the first set temperature, the opening degree of the steam valve 2 is controlled to be constant.
Wherein the first set temperature is greater than the second set temperature.
When the estimated temperature value is greater than the first set temperature, it indicates that the temperature of the rotary kiln 1 is relatively high, and therefore the opening of the steam valve 2 is controlled to be reduced to reduce the supply amount of steam, so that the temperature in the rotary kiln 1 can be lowered.
When the estimated temperature value is less than the second set temperature, it indicates that the temperature of the rotary kiln 1 is low, and therefore the opening degree of the steam valve 2 is controlled to be increased to increase the steam supply amount so that the temperature in the rotary kiln 1 can be increased.
When the estimated temperature value is between the second set temperature and the first set temperature (i.e., greater than or equal to the second set temperature and less than or equal to the first set temperature), it indicates that the temperature of the rotary kiln 1 is proper, and at this time, the opening degree of the steam valve 2 is kept unchanged.
In other words, the interval between the second set temperature and the first set temperature is an interval in which the temperature of the rotary kiln 1 is not adjusted. This corresponds to setting a dead zone control for the temperature of the rotary kiln 1. When the dead zone is reached, the steam valve 2 does not act, the current state is kept, and PID algorithm control is not carried out; only when the temperature is outside the dead zone, the PID algorithm control is carried out, and the steam valve 2 can act to regulate the temperature of the rotary kiln 1.
In an exemplary embodiment, the first set temperature is: the temperature of the feed opening of the rotary kiln 1 when the crystal water content of the gypsum raw material after the frying is 5.5 percent. The second set temperature is: the temperature of the feed opening of the rotary kiln 1 when the crystal water content of the gypsum raw material after the frying is 6 percent.
Research shows that when the crystal water content of the gypsum raw material (namely the calcined gypsum) after the stir-frying is 5.5 to 6 percent, the performance of the prepared gypsum board is better. Therefore, the first set temperature is set to the temperature of the feed opening of the rotary kiln 1 when the crystal water content is 5.5%, and the second set temperature is set to the temperature of the feed opening of the rotary kiln 1 when the crystal water content is 6%, so that the crystal water content of the gypsum raw material obtained after stir-frying is in the range of 5.5% to 6%, and the crystal water is prevented from being abnormal.
Wherein, the temperature of the feed opening of the rotary kiln 1 can be the material temperature at the feed opening. Such as: the tail of the rotary kiln 1 is provided with a tail discharger 303, the outlet of the tail discharger 303 is a feed opening of the rotary kiln 1, a temperature measuring point is arranged at the feed opening, and the measured material temperature is the temperature of the feed opening of the rotary kiln 1.
The specific values of the first set temperature and the second set temperature can be obtained by detection in the production process or the experimental process.
Of course, the first set temperature and the second set temperature may be set to other temperature values as needed.
In an exemplary embodiment, the temperature control system further comprises: a third temperature measuring element 5, as shown in FIG. 3. The third temperature measuring element 5 is arranged to detect the temperature of the feed opening of the rotary kiln 1.
The temperature of the feed opening of the rotary kiln 1 is detected, so that the actual temperature of the fried gypsum raw material can be conveniently and timely known by workers. The actual temperature and the temperature estimated value are subjected to reference and proofreading for comparison, so that a calculation formula of the temperature estimated value is conveniently and reasonably adjusted, and the accuracy of temperature control is further improved.
The embodiment of this application still provides a stir-fry material system of gypsum board production line, includes: a rotary kiln 1, a steam valve 2 connected to a steam inlet of the rotary kiln 1 and a temperature control system as provided in any of the embodiments above.
Further, as shown in fig. 3, the stir-frying system further comprises a first control valve 91, a second control valve 92, a heat exchanger 93, a regenerative fan 94, a silencer 95 and a fourth temperature measuring element 96. Condensed water formed by condensing steam flows in the heat exchanger 93. The regenerative fan 94 operates to make the heat exchanger 93 generate hot air, which is sent to the middle and tail of the rotary kiln 1 through the regenerative pipeline. The silencer 95 is used to reduce noise of the regenerative fan 94. The fourth temperature measuring element 96 is used for detecting the temperature of the air flow in the heat return pipeline, so as to control the opening degrees of the first control valve 91 and the second control valve 92.
The frying system further comprises a head discharger 301, a middle discharger 302 and a tail discharger 303. The head and the middle part of the rotary kiln 1 are provided with feed back ports. Gypsum raw material dried at the head of the rotary kiln 1 can be discharged through a head discharger 301 and conveyed to a double screw feeder 202 through a zipper 204 and a bucket elevator 205. The gypsum raw material calcined in the middle of the rotary kiln 1 may be discharged through a middle discharger 302 and conveyed to a twin screw feeder 202 through a screw conveyor 203, a zipper 204, and a bucket elevator 205.
The belt conveyor 201 conveys the raw gypsum material to the double-screw feeder 202 through the airlock discharger 304. Thus, the gypsum raw material and the dried or calcined gypsum raw material are mixed on the double-screw feeder 202 and then are fed into the rotary kiln 1 for frying, so that the gypsum raw material entering the rotary kiln 1 has a certain temperature, the moisture in the desulfurized gypsum is removed, the problem of equipment corrosion caused by high moisture content of the gypsum raw material can be solved, and the stability of the fried material of the rotary kiln 1 is facilitated.
To sum up, the fried material system of temperature control method, temperature control device, temperature control system and gypsum board production line that this application embodiment provided can be automatically through the aperture of PID program adjustment steam valve, and then promote or reduce fried material temperature, has realized the automatic control of fried material temperature, can also detect the actual unloading temperature of contrast through feed opening ejection of compact temperature, and whole result of use is better, fries the material system at similar rotary kiln and all possesses the meaning of using reference.
In any one or more of the exemplary embodiments described above, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium and executed by a hardware-based processing unit. Computer-readable media may comprise computer-readable storage media corresponding to tangible media, such as data storage media, or communication media including any medium that facilitates transfer of a computer program from one place to another, such as according to a communication protocol. In this manner, the computer-readable medium may generally correspond to a non-transitory tangible computer-readable storage medium or a communication medium such as a signal or carrier wave. A data storage medium may be any available medium that can be accessed by one or more computers or one or more processors to retrieve instructions, code and/or data structures for implementing the techniques described in this disclosure. The computer program product may include a computer-readable medium.
By way of example, and not limitation, such computer-readable storage media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, flash memory, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer. Also, any connection may be termed a computer-readable medium, and if instructions are transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, for example, the coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. It should be understood, however, that computer-readable storage media and data storage media do not include connections, carrier waves, signals, or other transitory (transitory) media, but are instead directed to non-transitory tangible storage media. Disk and disc, as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk or blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
For example, the instructions may be executed by one or more processors, such as one or more Digital Signal Processors (DSPs), general purpose microprocessors, Application Specific Integrated Circuits (ASICs), field programmable logic arrays (FPGAs), or other equivalent integrated or discrete logic circuitry. Thus, the term "processor," as used herein may refer to any of the foregoing structure or any other structure suitable for implementation of the techniques described herein. In addition, in some aspects, the functionality described herein may be provided within dedicated hardware and/or software modules configured for encoding and decoding, or incorporated in a combined codec. Also, the techniques may be fully implemented in one or more circuits or logic elements.
The techniques of the embodiments of the present disclosure may be implemented in a wide variety of devices or apparatuses, including a wireless handset, an Integrated Circuit (IC), or a set of ICs (e.g., a chipset). Various components, modules, or units are described in embodiments of the disclosure to emphasize functional aspects of devices configured to perform the described techniques, but do not necessarily require realization by different hardware units. Rather, as noted above, the various units may be combined in a codec hardware unit or provided by a collection of interoperating hardware units (including one or more processors as noted above) in conjunction with suitable software and/or firmware.
Claims (10)
1. A temperature control method is used for a frying system of a gypsum board production line, the frying system comprises a rotary kiln and a steam valve connected with a steam inlet of the rotary kiln, and the temperature control method is characterized by comprising the following steps:
acquiring the temperature of the middle part and the tail part of the rotary kiln;
and controlling the opening degree of the steam valve according to the temperatures of the middle part and the tail part of the rotary kiln.
2. The temperature control method as claimed in claim 1, wherein the controlling of the opening degree of the steam valve according to the temperatures of the middle and the tail of the rotary kiln comprises:
determining temperature estimated values according to the temperatures of the middle part and the tail part of the rotary kiln;
and controlling the opening of the steam valve according to the estimated temperature value.
3. The method as claimed in claim 2, wherein said determining the estimated temperature values based on the temperatures of the middle and end portions of the rotary kiln comprises:
calculating and determining the estimated temperature value according to the following calculation formula;
the calculation formula is as follows: d ═ a × a% + B × B%; wherein D is the estimated temperature value, A is the temperature of the middle part of the rotary kiln, and B is the temperature of the tail part of the rotary kiln.
4. The temperature control method according to claim 3,
the a is 40, and the b is 60.
5. The temperature control method according to any one of claims 2 to 4, wherein the controlling the opening degree of the steam valve according to the temperature estimation value includes:
when the estimated temperature value is greater than a first set temperature, controlling the opening degree of the steam valve to be reduced;
when the estimated temperature value is smaller than a second set temperature, controlling the opening of the steam valve to increase;
when the temperature estimation value is between the second set temperature and the first set temperature, controlling the opening degree of the steam valve to be kept unchanged;
wherein the first set temperature is greater than the second set temperature.
6. The temperature control method according to claim 5,
the first set temperature is: the temperature of a feed opening of the rotary kiln is controlled when the content of crystal water of the gypsum raw material after frying is 5.5%;
the second set temperature is: and when the content of the crystal water of the gypsum raw material after frying is 6%, the temperature of a feed opening of the rotary kiln is controlled.
7. The temperature control method according to any one of claims 1 to 4, characterized by further comprising:
and acquiring the temperature of the feed opening of the rotary kiln.
8. A temperature control apparatus for a gypsum board production line, the temperature control apparatus comprising a processor and a memory storing a computer program, the processor implementing the steps of the temperature control method according to any one of claims 1 to 7 when executing the computer program.
9. A frying system for a gypsum board production line, comprising the temperature control device of claim 8.
10. A temperature control system is used for a frying system of a gypsum board production line, the frying system comprises a rotary kiln and a steam valve connected with a steam inlet of the rotary kiln, and is characterized in that the temperature control system comprises:
the first temperature measuring element is arranged for detecting the temperature of the middle part of the rotary kiln;
the second temperature measuring element is arranged for detecting the temperature of the tail part of the rotary kiln; and
and the controller is electrically connected with the first temperature measuring element and the second temperature measuring element and is used for controlling the opening degree of the steam valve according to the temperatures of the middle part and the tail part of the rotary kiln.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111527729.0A CN114394773B (en) | 2021-12-14 | 2021-12-14 | Temperature control method, device and system and material frying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111527729.0A CN114394773B (en) | 2021-12-14 | 2021-12-14 | Temperature control method, device and system and material frying system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114394773A true CN114394773A (en) | 2022-04-26 |
| CN114394773B CN114394773B (en) | 2022-12-20 |
Family
ID=81227284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111527729.0A Active CN114394773B (en) | 2021-12-14 | 2021-12-14 | Temperature control method, device and system and material frying system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114394773B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050274113A1 (en) * | 2004-06-11 | 2005-12-15 | Takaaki Sekiai | Steam temperature control system, method of controlling steam temperature and power plant using the same |
| CN203534121U (en) * | 2013-09-10 | 2014-04-09 | 宁波北新建材有限公司 | Gypsum plate drying device |
| CN106380096A (en) * | 2016-08-25 | 2017-02-08 | 北新集团建材股份有限公司 | Gypsum powder calcination method and rotary kiln |
| CN107619208A (en) * | 2017-09-29 | 2018-01-23 | 山东海蓝阳光环境服务有限公司 | A kind of production system and its implementation that plaster of Paris is produced with desulfurated plaster |
| CN109160757A (en) * | 2018-09-11 | 2019-01-08 | 宁波北新建材有限公司 | It is a kind of to improve the control method that desulfurized gypsum prepares plaster of paris quality based on temperature and humidity |
| US20190330106A1 (en) * | 2016-11-18 | 2019-10-31 | Knauf Gips Kg | Process and apparatus for calcination of gypsum |
-
2021
- 2021-12-14 CN CN202111527729.0A patent/CN114394773B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050274113A1 (en) * | 2004-06-11 | 2005-12-15 | Takaaki Sekiai | Steam temperature control system, method of controlling steam temperature and power plant using the same |
| CN203534121U (en) * | 2013-09-10 | 2014-04-09 | 宁波北新建材有限公司 | Gypsum plate drying device |
| CN106380096A (en) * | 2016-08-25 | 2017-02-08 | 北新集团建材股份有限公司 | Gypsum powder calcination method and rotary kiln |
| US20190330106A1 (en) * | 2016-11-18 | 2019-10-31 | Knauf Gips Kg | Process and apparatus for calcination of gypsum |
| CN107619208A (en) * | 2017-09-29 | 2018-01-23 | 山东海蓝阳光环境服务有限公司 | A kind of production system and its implementation that plaster of Paris is produced with desulfurated plaster |
| CN109160757A (en) * | 2018-09-11 | 2019-01-08 | 宁波北新建材有限公司 | It is a kind of to improve the control method that desulfurized gypsum prepares plaster of paris quality based on temperature and humidity |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114394773B (en) | 2022-12-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103576711B (en) | Based on the chemical reactor temperature-controlled process that quantitative one-parameter PID controls | |
| CN114394773B (en) | Temperature control method, device and system and material frying system | |
| CN106017050A (en) | Automatic temperature regulating system and method for hot air drier | |
| CN205783315U (en) | A kind of central heating temperature automatic adjustment system | |
| CN105116009A (en) | Heating simulation device and heat pipe heat dispersion detection device | |
| CN103561497A (en) | Distributed type microwave heating and drying control device and method | |
| Singh et al. | Implementation and evaluation of heating system using PID with genetic algorithm | |
| CN105865215A (en) | Temperature multi-parameter control system for cement kiln | |
| CN104460751A (en) | Chemical liquid temperature control device applied to chemical liquid feeding system | |
| CN111457781B (en) | Parallel loop water mixing heat exchange PID control system and control method thereof | |
| CN102631878A (en) | Intelligent reaction kettle | |
| CN113578217A (en) | Intelligent temperature control equipment based on accurate temperature control of reation kettle material | |
| CN103671060A (en) | Sensor-free constant current pump valve integrated device | |
| CN108013082A (en) | A kind of industrial oven temperature control system | |
| CN202470796U (en) | Intelligent control system for temperature of resistance furnace | |
| CN116806064A (en) | Induction heating power supply control method | |
| CN109668326A (en) | A kind of instant heating type dynamic temperature control method based on pid algorithm | |
| CN112963899B (en) | Precise control method and system for multi-valve multi-mode adjustment | |
| CN204043423U (en) | For board-like SCR denitration calcining furnace temperature measurement and control instrument | |
| CN203732701U (en) | Quenching machine tool induction heating power supply fault diagnosis system | |
| CN203357842U (en) | Multi-path PID (Proportional-Integral-Derivative) temperature controller | |
| CN102749940B (en) | Double-temperature-control constant-temperature heating system | |
| CN104495919B (en) | Rutile type titanium white calcining heat control method and autocontrol method thereof | |
| CN206177484U (en) | Tungsten rhenium thermocouple examination data acquisition system | |
| EP3844590A1 (en) | Mass flow controller, controller algorithm, and set point filter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |