CN109442876B - 2-chloronicotinic acid drying system and drying method - Google Patents
2-chloronicotinic acid drying system and drying method Download PDFInfo
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- CN109442876B CN109442876B CN201811256865.9A CN201811256865A CN109442876B CN 109442876 B CN109442876 B CN 109442876B CN 201811256865 A CN201811256865 A CN 201811256865A CN 109442876 B CN109442876 B CN 109442876B
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- pressure sensor
- automatic control
- regulating valve
- control regulating
- dryer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
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- Drying Of Solid Materials (AREA)
Abstract
The invention provides a 2-chloronicotinic acid drying system and a drying method, wherein the drying system comprises: the drying device comprises a steam generator, a first pressure sensor, a first automatic control regulating valve, a second pressure sensor, a dryer and a PLC (programmable logic controller), wherein the steam generator, the first pressure sensor, the first automatic control regulating valve, the second pressure sensor and the dryer are sequentially communicated through a pipeline, the first pressure sensor, the first automatic control regulating valve and the second pressure sensor are electrically connected with the PLC, the drying method adopts temperature programming, and steam pressure entering the dryer is controlled through the PLC, so that the aim of controlling the temperature is fulfilled.
Description
Technical Field
The invention relates to the technical field of 2-chloronicotinic acid production, in particular to a drying system and a drying method for 2-chloronicotinic acid.
Background
At present, a rotary dryer is generally adopted for drying 2-chloronicotinic acid, the rotary dryer is rotated at 70 ℃, in order to achieve the purpose of accelerating the drying speed of materials in the dryer, the interior of the rotary dryer can be in a negative pressure state, the way of providing drying heat for the dryer is generally high-pressure steam, the high-pressure steam can continuously provide heat for equipment, but the temperature cannot be accurately controlled, when the temperature to be heated is lower than 100 ℃, the high-pressure steam is difficult to control the temperature to be stabilized at 100 ℃, the requirement of the high-pressure steam on the equipment is high, the equipment is easy to damage, and the utilization rate of the heat energy is not high.
The low pressure steam has a lower working pressure than the high pressure steam, and thus it is easier to control the temperature and the temperature is more stable than the high pressure steam. However, the low-pressure steam generator cannot directly control the temperature, the pressure of the steam can be changed, and if the low-pressure steam generator is directly used for industrial production, inconvenience is caused, and even normal production is affected.
Disclosure of Invention
In view of the above, the invention provides a low-pressure steam-based 2-chloronicotinic acid drying system and a drying method, which can accurately and efficiently control the temperature.
The technical scheme of the invention is realized as follows: the invention provides a 2-chloronicotinic acid drying system, which comprises: steam generator, first pressure sensor, first automatic control governing valve, second pressure sensor, desicator and PLC controller, steam generator, first pressure sensor, first automatic control governing valve, second pressure sensor and desicator communicate through the pipeline in proper order, first pressure sensor, first automatic control governing valve and second pressure sensor all with PLC controller electric connection.
On the basis of the technical scheme, the automatic control system preferably further comprises a vacuum pump and a second automatic control regulating valve, and a pipeline between the first automatic control regulating valve and the second pressure sensor is communicated with the vacuum pump through the second automatic control regulating valve.
On the basis of the technical scheme, preferably, the vacuum pump is communicated with the dryer through a pipeline, and the second self-control regulating valve is electrically connected with the PLC.
On the basis of the above technical scheme, preferably, a first stop valve is further arranged on a pipeline through which the steam generator is communicated with the first pressure sensor, and a second stop valve is arranged on a pipeline through which the second pressure sensor is communicated with the dryer.
Further preferably, a branch pipe communicated with the outside is further arranged on the pipeline between the first self-control regulating valve and the dryer, and a pressure release valve is arranged on the branch pipe.
On the basis of the above technical solution, preferably, a drain valve is arranged on a pipeline between the steam generator and the dryer.
On the basis of the technical scheme, preferably, a temperature sensor is arranged in the dryer and electrically connected with the PLC.
The invention also provides a drying method of the 2-chloronicotinic acid, which comprises the following steps:
step one, keeping a first stop valve and a second stop valve open, closing a pressure relief valve, and starting a steam generator and a vacuum pump;
secondly, the first pressure sensor and the second pressure sensor respectively detect the pressure values of the pipeline in front of and behind the first automatic control regulating valve and transmit pressure value signals to the PLC, and the PLC outputs control signals to the first automatic control regulating valve and the second automatic control regulating valve so as to regulate the opening degrees of the first automatic control regulating valve and the second automatic control regulating valve;
and step three, feeding back signals from the first pressure sensor and the second pressure sensor in different stages by the PLC according to a preset temperature-rising program.
On the basis of the above technology, preferably, the temperature raising procedure in step three is: controlling the temperature in the dryer to be 30 +/-10 ℃, preserving heat for 2 +/-0.5 h, after heat preservation, heating to 50 +/-10 ℃, preserving heat for 2 +/-0.5 h, after heat preservation, heating to 70 +/-10 ℃, preserving heat for 4 +/-0.5 h, and after heat preservation, stopping the operation of the steam generator and the vacuum pump.
Compared with the prior art, the 2-chloronicotinic acid drying system and the drying method have the following beneficial effects:
(1) according to the invention, the first automatic control regulating valve is adopted to regulate the opening degree of the pipeline between the steam generator and the dryer, the steam conveying capacity is regulated to achieve the purpose of regulating the temperature, and meanwhile, the second automatic control regulating valve is also utilized to regulate the opening degree of the pipeline between the vacuum pump and the steam pipeline, so that the purpose of regulating the steam pressure in the steam pipeline is achieved;
(2) the drying system adopts the PLC to control the first automatic control regulating valve and the second automatic control regulating valve, thereby saving the labor, achieving the purpose of automatic control by presetting a temperature-rising program, and avoiding the error caused by manual operation.
(3) The invention adjusts the pressure of the steam pipeline through the vacuum pump 7, and avoids the problem that the heating temperature cannot be well controlled due to unstable steam generated by the steam generator.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the connection structure of the 2-chloronicotinic acid drying system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the 2-chloronicotinic acid drying system of the present invention comprises a steam generator 1, a first pressure sensor 2, a first automatic control regulating valve 3, a second pressure sensor 4 and a dryer 5 which are sequentially communicated through a pipeline, and further comprises a PLC controller 6, wherein the first pressure sensor 2, the first automatic control regulating valve 3 and the second pressure sensor 4 are all electrically connected with the PLC controller 6.
Steam generator 1 produces steam and sends dryer 5 to through the steam conduit, respectively through first pressure sensor 2 and second pressure sensor 4 around first automatic control governing valve 3, first pressure sensor 2 detects the pressure value of the steam that comes from steam generator 1, second pressure sensor 4 detects the steam pressure value after first automatic control governing valve 3 adjusts, PLC controller 6 outputs corresponding regulation signal according to two pressure values and gives first automatic control governing valve 3.
In a specific embodiment, the system further comprises a vacuum pump 7 and a second self-control regulating valve 8, wherein the vacuum pump 7 is communicated with the pipeline between the first self-control regulating valve 3 and the second pressure sensor 4 through the second self-control regulating valve 8.
In one embodiment, the second self-control regulating valve 8 is electrically connected with the PLC controller 6, and the vacuum pump 7 is communicated with the dryer 5 through a pipeline.
Open and close of second automatic control governing valve 8 is controlled through PLC controller 6, thereby make the steam pressure of carrying to desicator 5 obtain further regulation, be connected to between first automatic control governing valve 3 and the second pressure sensor 4 with the evacuation pipeline of vacuum pump 7, thereby the pressure measurement value that lets second pressure sensor 4 obtain is unanimous with the steam pressure value that gets into desicator 5 basically, vacuum pump 7 passes through pipeline and desicator 5 lug connection, improve the availability of vacuum pump 7, secondly jointly mediate through first automatic control governing valve 3 and second automatic control governing valve 8, let the pressure control of steam more accurate, it is faster to adjust reaction rate.
In one embodiment, a first stop valve 9 is disposed on a pipeline of the steam generator 1 communicated with the first pressure sensor 2, and a second stop valve 10 is disposed on a pipeline of the second pressure sensor 4 communicated with the dryer 5.
Can carry out manual operation through the stop valve, can't control the switching of steam source and end when preventing that the pipeline from appearing unexpected.
In a specific embodiment, a branch pipe 11 is arranged on a pipeline between the first self-control regulating valve 3 and the dryer 5, the branch pipe 11 is communicated with the outside, and a pressure release valve 12 is arranged on the branch pipe 11.
Through branch pipe 11 and relief valve 12 structure be convenient for prevent that the unexpected condition from leading to pipeline pressure too high, branch pipe 11 and relief valve 12 structure can in time release the pressure, avoid the dangerous condition to take place.
In a specific embodiment, a trap 13 is provided in the conduit between the steam generator 1 and the drying tube.
The drain valve 13 can discharge condensed water, air and other impurities in the steam pipeline in time, so that the influence of the condensed water, the air and other impurities on the normal work of the valve and the sensor in the pipeline is avoided.
In one embodiment, a temperature sensor 14 is disposed in the dryer 5, and the temperature sensor 14 is electrically connected to the PLC controller 6, which is not shown in fig. 1.
A2-chloronicotinic acid drying method comprises the following steps:
step one, keeping the first stop valve 9 and the second stop valve 10 open, closing the pressure release valve 12, and opening the steam generator 1 and the vacuum pump 7;
secondly, the first pressure sensor 2 and the second pressure sensor 4 respectively detect the pipeline pressure values in front of and behind the first automatic control regulating valve 3, and transmit pressure value signals to the PLC controller 6, and the PLC controller 6 outputs control signals to the first automatic control regulating valve 3 and the second automatic control regulating valve 8 so as to regulate the opening degrees of the first automatic control regulating valve 3 and the second automatic control regulating valve 8;
and step three, feeding back signals from the first pressure sensor 2 and the second pressure sensor 4 at different stages by the PLC 6 according to a preset temperature-rising program.
In a specific embodiment, the temperature raising procedure in step three is as follows: controlling the temperature in the dryer 5 to be 30 +/-10 ℃, preserving heat for 2 +/-0.5 h, after heat preservation, heating to 50 +/-10 ℃, preserving heat for 2 +/-0.5 h, after heat preservation, heating to 70 +/-10 ℃, preserving heat for 4 +/-0.5 h, and after heat preservation, stopping the operation of the steam generator 1 and the vacuum pump 7.
The method comprises the steps that a first pressure sensor 2, a second pressure sensor 4 and a temperature sensor 14 are used for collecting pressure values on a steam pipeline in a drying system and corresponding temperatures in a dryer 5, corresponding detection signals are transmitted to a PLC (programmable logic controller) 6, the PLC 6 outputs corresponding feedback signals to a first automatic control regulating valve 3 and a second automatic control regulating valve 8 according to a preset temperature rising program, steam pressure conveyed into the dryer 5 is regulated through the two automatic control regulating valves, and the change of the temperature values is accurately controlled by changing the steam pressure.
The drying system can directly convert high-pressure steam or medium-pressure steam into low-pressure steam, and can also perform pressure stabilization control on the low-pressure steam, so that the low-pressure steam with stable pressure is generated, meanwhile, the drying system can also accurately and timely control the pressure value of the low-pressure steam, so that the effect of controlling the heating temperature of the dryer 5 is achieved, and therefore, the drying operation of the 2-chloronicotinic acid can be performed more efficiently.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (2)
1. A 2-chloronicotinic acid drying system, comprising: the steam generator (1), the first pressure sensor (2), the first automatic control regulating valve (3), the second pressure sensor (4), the dryer (5) and the PLC controller (6) are sequentially communicated through a pipeline, the first pressure sensor (1), the first pressure sensor (2), the first automatic control regulating valve (3), the second pressure sensor (4) and the dryer (5) are electrically connected with the PLC controller (6), the steam generator further comprises a vacuum pump (7) and a second automatic control regulating valve (8), the pipeline between the first automatic control regulating valve (3) and the second pressure sensor (4) is communicated with the vacuum pump (7) through the second automatic control regulating valve (8), the vacuum pump (7) is communicated with the dryer (5) through a pipeline, the second automatic control regulating valve (8) is electrically connected with the PLC (6), a temperature sensor (14) is arranged in the dryer (5), the temperature sensor (14) is electrically connected with the PLC (6), a first stop valve (9) is further arranged on a pipeline communicated with the first pressure sensor (2) of the steam generator (1), a second stop valve (10) is arranged on a pipeline communicated with the dryer (5) of the second pressure sensor (4), a branch pipe (11) is further arranged on a pipeline between the first automatic control regulating valve (3) and the dryer (5) and communicated with the outside, a pressure release valve (12) is arranged on the branch pipe (11), and the method for drying the 2-chloronicotinic acid by the 2-chloronicotinic acid drying system comprises the following steps:
step one, keeping a first stop valve (9) and a second stop valve (10) open, closing a pressure release valve (12), and opening a steam generator (1) and a vacuum pump (7);
secondly, the first pressure sensor (2) and the second pressure sensor (4) respectively detect the pressure values of the pipeline in front of and behind the first automatic control regulating valve (3), and transmit pressure value signals to the PLC (6), and the PLC (6) outputs control signals to the first automatic control regulating valve (3) and the second automatic control regulating valve (8) so as to regulate the opening degrees of the first automatic control regulating valve (3) and the second automatic control regulating valve (8);
thirdly, feeding back signals from the first pressure sensor (2) and the second pressure sensor (4) in different stages by the PLC (6) according to a preset temperature-raising program, wherein the temperature-raising program is as follows: controlling the temperature in the dryer (5) to be 30 +/-10 ℃, preserving heat for 2 +/-0.5 h, after heat preservation, heating to 50 +/-10 ℃, preserving heat for 2 +/-0.5 h, after heat preservation, heating to 70 +/-10 ℃, preserving heat for 4 +/-0.5 h, and after heat preservation, stopping the operation of the steam generator (1) and the vacuum pump (7).
2. 2-chloronicotinic acid drying system according to claim 1, characterized in that a trap (13) is provided in the piping between the steam generator (1) and the dryer (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811256865.9A CN109442876B (en) | 2018-10-25 | 2018-10-25 | 2-chloronicotinic acid drying system and drying method |
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| CN201811256865.9A CN109442876B (en) | 2018-10-25 | 2018-10-25 | 2-chloronicotinic acid drying system and drying method |
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| CN109442876A CN109442876A (en) | 2019-03-08 |
| CN109442876B true CN109442876B (en) | 2021-02-26 |
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| CN115451662B (en) * | 2022-09-02 | 2023-10-31 | 大连北方互感器集团有限公司 | Vacuum drying operation process of silica micropowder pre-drying system |
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| CN101117332B (en) * | 2006-08-04 | 2012-03-28 | 浙江医药股份有限公司新昌制药厂 | Preparation method of 2-chloronicotinic acid |
| CN102993092A (en) * | 2012-12-05 | 2013-03-27 | 江苏拜克新材料有限公司 | Synthetic method for 2-Chloronicotinicacid |
| CN203217391U (en) * | 2013-04-15 | 2013-09-25 | 河南天地药业股份有限公司 | Steam pressure controlling device for extraction pot |
| CN206959498U (en) * | 2017-04-05 | 2018-02-02 | 苏州载物强劲新材料科技有限公司 | A kind of totally-enclosed bipyramid drying and crushing device |
| CN207888964U (en) * | 2017-12-29 | 2018-09-21 | 溧阳市乔森塑料有限公司 | A kind of vacuum desiccator and wet granulation after-treatment system |
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