CN211978501U - A device for pivaloyl chloride detects - Google Patents
A device for pivaloyl chloride detects Download PDFInfo
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- CN211978501U CN211978501U CN202020741523.2U CN202020741523U CN211978501U CN 211978501 U CN211978501 U CN 211978501U CN 202020741523 U CN202020741523 U CN 202020741523U CN 211978501 U CN211978501 U CN 211978501U
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- sensor
- cracking furnace
- thermal cracking
- pivaloyl chloride
- detection
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Abstract
The utility model relates to a device for detecting pivaloyl chloride, which comprises a thermal cracking furnace and a heating power supply connected with the thermal cracking furnace, wherein a temperature sensor is arranged in the thermal cracking furnace, an outlet pipeline of the thermal cracking furnace is sequentially connected with a hydrogen chloride sensor and a flow control system, the flow control system comprises a group of connected regulating valve, flow sensor and air pump, the temperature sensor, the hydrogen chloride sensor and the flow sensor are connected with a controller, and the controller is connected with the air pump; the heating power supply, the controller and the display are all connected with a main power supply. The utility model has the advantages that can be in real time, accurate and carry out effective detection to special valeryl chloride fast, improved the detection precision and the detection efficiency of special valeryl chloride.
Description
Technical Field
The utility model belongs to the technical field of special valeryl chloride check out test set technique and specifically relates to a device that is used for special valeryl chloride to detect.
Background
Pivaloyl chloride is widely applied to the industries of medicine, pesticide and organic chemical synthesis, is liquid at normal temperature and has volatility, the saturated vapor pressure at 21.1 ℃ is 13.3kPa, volatilized gas has sourness and irritation and strong corrosivity, and in the air, when the content reaches fifteen parts per million, the pivaloyl chloride can cause damage to human bodies and equipment, so that the pivaloyl chloride is a harmful gas which needs to be accurately detected; it is also a precursor for VOCs that produce haze and ozone. During the production, storage, transportation and use of the waste gas, the waste gas is discharged and leaked, so that the atmosphere is polluted, and the waste gas is an environmental pollutant which must be treated.
At present, in the case of contamination involving pivaloyl chloride, the detection of pivaloyl chloride is carried out by on-site sampling and then laboratory analysis. The method cannot detect in real time, is far from the practical requirement, and has lower detection precision. On pivaloyl chloride treatment equipment, the discharge of the tail end needs real-time and effective monitoring and supervision, and no available fixed instrument exists at present; likewise, leak detection of equipment, transport vehicles and tanks also does not have a hand-held instrument available, nor does the inorganized atmosphere have a corresponding monitoring instrument.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the purpose is exactly in order to solve the unable real-time effective monitoring of current pivaloyl chloride, detect precision and the problem of inefficiency, provides a device for monitoring of pivaloyl chloride, through turning into the material that can accurately detect with pivaloyl chloride, monitors its concentration variation effectively in real time, improves the efficiency that pivaloyl chloride detected.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a device for detecting pivaloyl chloride comprises a thermal cracking furnace and a heating power supply connected with the thermal cracking furnace, wherein a temperature sensor is arranged in the thermal cracking furnace, and the temperature sensor is connected with an external controller through a signal transmission line so as to detect the temperature in the thermal cracking furnace and prevent the thermal cracking furnace from being damaged due to overhigh temperature in the thermal cracking furnace;
the outlet pipeline of the thermal cracking furnace is sequentially connected with a hydrogen chloride sensor and a flow control system, wherein the hydrogen chloride sensor is used for detecting the concentration of hydrogen chloride and is connected with the controller through a signal transmission line so as to transmit the detected concentration of hydrogen chloride to the controller for calculation and analysis;
the flow control system comprises a group of regulating valves for regulating the flow of the gas path, a flow sensor for detecting the flow and an air pump for providing air pumping power, wherein the group of regulating valves are connected with each other;
the controller is connected with a display through a signal transmission line so as to display the processed temperature data and the processed concentration data;
the heating power supply, the controller and the display are all connected with a main power supply through leads.
Further, the temperature sensor is a thermocouple sensor or a platinum resistance temperature sensor.
Further, the hydrogen chloride sensor may be an infrared sensor, an electrochemical sensor, or a semiconductor sensor.
Furthermore, the power supply of the thermal cracking furnace adopts a stabilized voltage power supply and a soft start circuit, so as to ensure that the heating furnace wire is not burnt out by the circuit due to overlarge current at the heating starting stage.
Furthermore, the heating voltage of the thermal cracking furnace is 18-28V.
Further, the flow sensor is a thermal bridge type flow sensor.
Further, the air pump is a direct current air pump, so as to adjust the flow rate of the air pump within a certain range by changing the voltage of the direct current air pump.
Further, the temperature control range in the thermal cracking furnace is 800-1200 ℃.
Further, the detection range of the concentration of pivaloyl chloride is 0-200 mg/m3。
Furthermore, the gas flow control range of the flow control system is 0.1L-1.2L/min.
The technical scheme of the utility model, through letting in the pyrolysis furnace earlier with the air that contains trace pivaloyl chloride, pivaloyl chloride gas is cracked into the atom in high temperature, the atom recombination after the schizolysis makes up some new molecules, contain in the new molecule and be hydrogen chloride molecule of certain proportion with pivaloyl chloride gas, the gas that contains these hydrogen chloride molecules afterwards gets into in the hydrogen chloride sensor, hydrogen chloride produces corresponding signal of telecommunication on the hydrogen chloride sensor, these signal of telecommunication are directly proportional with the concentration of hydrogen chloride, transmit this signal of telecommunication to the analysis on the controller, through corresponding calculation, get the concentration of pivaloyl chloride; the flow control circuit system composed of the regulating valve, the flow sensor, the air pump and the controller can control the power supply voltage of the air pump according to the flow signal fed back by the circuit, and therefore the stability of the air flow is achieved. The utility model discloses a content of pivaloyl chloride is accurately measured through the mode of conversion measurement to the device, and convenient and fast has more, has also shortened the time of detection greatly when having improved measurement accuracy, has improved detection efficiency, can the change of real-time supervision concentration.
Drawings
Fig. 1 is a schematic structural diagram of a device for detecting pivaloyl chloride according to the present invention.
Detailed Description
Example 1
In order to make the present invention more clear, the following description of the device for detecting pivaloyl chloride according to the present invention is provided with reference to the accompanying drawings, and the specific embodiments described herein are only used for explaining the present invention, and are not used for limiting the present invention.
As shown in fig. 1, a device for detecting pivaloyl chloride is characterized in that:
the device comprises a thermal cracking furnace and a heating power supply connected with the thermal cracking furnace, wherein a temperature sensor is arranged in the thermal cracking furnace and is connected with an external controller through a signal transmission line so as to detect the temperature in the thermal cracking furnace and prevent the thermal cracking furnace from being damaged due to overhigh temperature in the thermal cracking furnace;
the outlet pipeline of the thermal cracking furnace is sequentially connected with a hydrogen chloride sensor and a flow control system, wherein the hydrogen chloride sensor is used for detecting the concentration of hydrogen chloride and is connected with the controller through a signal transmission line so as to transmit the detected concentration of hydrogen chloride to the controller for calculation and analysis;
the flow control system comprises a group of regulating valves for regulating the flow of the gas path, a flow sensor for detecting the flow and an air pump for providing air pumping power, wherein the group of regulating valves are connected with each other;
the controller is connected with a display through a signal transmission line so as to display the processed temperature data and the processed concentration data;
the heating power supply, the controller and the display are all connected with a main power supply through leads.
The temperature sensor adopts a platinum resistance temperature sensor for detecting the temperature in the cracking furnace, and the instrument sends out an alarm signal when the temperature is too high.
The hydrogen chloride sensor can select an infrared sensor, an electrochemical sensor or a semiconductor sensor and the like according to the type and concentration of gas to be detected, and a proper sensor is selected according to the requirements of precision, response time and service life.
The temperature control circuit of the thermal cracking furnace adopts a mode of a voltage stabilizing circuit and a soft start circuit, when heating, the heating resistor is in a cold state and has low resistance, so that low voltage is needed to be added, and then the low voltage is gradually increased to stable voltage, so that the thermal cracking furnace needs to adopt the soft start circuit to ensure that the heating furnace wire cannot be burnt out due to overlarge current in the heating starting stage of the circuit. The voltage required for heating the thermal cracking furnace is determined according to the speed and detection precision of the detected gas, and 18-28V DC is generally adopted.
The flow sensor is a thermal bridge type flow sensor which needs to be arranged behind the regulating valve so as to prevent the flow sensor from being damaged during large-flow impact. The flow sensor needs a heating voltage and a control voltage, the control voltage is set according to needs, the sensor transmits flow signals to the single chip microcomputer, and the single chip microcomputer converts the signals into the flow signals and displays the flow signals on the display.
The air pump is a direct-current air pump, and aims to adjust the flow of the air pump within a certain range by changing the voltage of the direct-current air pump, so that the flow of air flow is stable, a control signal for controlling the voltage comes from a flow sensor, and the control is realized through a PID control loop.
The power supply shown in fig. 1 employs an AC-DC power supply when an external power supply is selected and a DC-DC power supply when a lithium battery is used for power supply; in addition, no matter what kind of power supply, the output voltage meets the adjustable requirement of 18-28V, and the power is 25-50W.
Before the pivaloyl chloride is detected by using the device, the device is debugged and calibrated:
(1) when the device is debugged, the flow is calibrated firstly, and the flow is selected to be 200-400 mL/min3(ii) a Then setting a heating voltage, wherein the voltage is further adjusted according to the signal size generated by the standard gas when the standard gas is introduced later;
(2) during calibration of the device, the concentration of the calibration gas needs to be determined according to factors such as a measurement range, an alarm point, a detection lower limit and the like. Three points are generally used: clean air serves as a zero point, an alarm point, and an upper detection limit 2/3 concentration point. The concentration line is determined by the three points, and the concentration curve is automatically stored in the memory by the singlechip and is used for calculating the concentration of pivaloyl chloride during detection.
After debugging and calibration, the test result of the device is as follows: the measurement range is 0-200 mg/m3The measurement precision is 5 percent (FS), the response time is less than or equal to 30s (90 percent FS), and the power consumption is less than or equal to 70W.
When the pivaloyl chloride gas detection is carried out, firstly, introducing air containing trace pivaloyl chloride into a cracking furnace, cracking pivaloyl chloride gas into atoms at the high temperature of 800-1200 ℃, recombining the cracked atoms into new molecules, wherein the new molecules contain hydrogen chloride molecules in a certain proportion to the pivaloyl chloride gas, then, introducing the gas containing the hydrogen chloride molecules into a hydrogen chloride sensor, generating corresponding electric signals on the hydrogen chloride sensor by hydrogen chloride, wherein the electric signals are in direct proportion to the concentration of hydrogen chloride, transmitting the electric signals to a controller for analysis, and obtaining the concentration of the pivaloyl chloride through corresponding calculation; the flow control circuit system composed of the regulating valve, the flow sensor, the air pump and the controller can control the power supply voltage of the air pump according to the flow signal fed back by the circuit, and therefore the stability of the air flow is achieved. The utility model discloses a device is through reasonable complete control system, and is real-time, accurate and carry out effective detection to pivaloyl chloride fast, has improved measurement accuracy and detection efficiency.
In addition to the above embodiments, the present invention may have other embodiments. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention.
Claims (9)
1. A device for pivaloyl chloride detects which characterized in that:
the thermal cracking furnace comprises a thermal cracking furnace and a heating power supply connected with the thermal cracking furnace, wherein a temperature sensor is arranged in the thermal cracking furnace, the temperature sensor is connected with an external controller through a signal transmission line, and the controller is connected with a display;
the outlet pipeline of the thermal cracking furnace is sequentially connected with a hydrogen chloride sensor and a flow control system, and the hydrogen chloride sensor is connected with a controller through a signal transmission line;
the flow control system comprises a group of regulating valves, a flow sensor and an air pump which are connected, wherein the flow sensor is connected with the controller through a signal transmission line, and the controller is connected with the air pump through a signal transmission line;
the heating power supply, the controller and the display are all connected with a main power supply.
2. The device for pivaloyl chloride detection according to claim 1, characterized in that:
the power supply of the thermal cracking furnace adopts a stabilized voltage power supply and a soft start circuit.
3. The device for the detection of pivaloyl chloride according to claim 1 or 2, characterized in that:
the concentration detection range of the pivaloyl chloride is 0-200 mg/m3。
4. The device for the detection of pivaloyl chloride according to claim 1 or 2, characterized in that:
the temperature control range in the thermal cracking furnace is 800-1200 ℃.
5. The device for the detection of pivaloyl chloride according to claim 1 or 2, characterized in that:
the gas flow control range of the flow control system is 0.1L-1.2L/min.
6. The device for the detection of pivaloyl chloride according to claim 1 or 2, characterized in that:
the temperature sensor is a thermocouple sensor or a platinum resistance temperature sensor.
7. The device for the detection of pivaloyl chloride according to claim 1 or 2, characterized in that:
the hydrogen chloride sensor is an infrared sensor, an electrochemical sensor or a semiconductor sensor.
8. The device for the detection of pivaloyl chloride according to claim 1 or 2, characterized in that:
the heating voltage of the thermal cracking furnace is 18-28V.
9. The device for the detection of pivaloyl chloride according to claim 1 or 2, characterized in that:
the flow sensor is a thermal bridge type flow sensor, and the air pump is a direct current air pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020741523.2U CN211978501U (en) | 2020-05-08 | 2020-05-08 | A device for pivaloyl chloride detects |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020741523.2U CN211978501U (en) | 2020-05-08 | 2020-05-08 | A device for pivaloyl chloride detects |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211978501U true CN211978501U (en) | 2020-11-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020741523.2U Expired - Fee Related CN211978501U (en) | 2020-05-08 | 2020-05-08 | A device for pivaloyl chloride detects |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211978501U (en) |
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2020
- 2020-05-08 CN CN202020741523.2U patent/CN211978501U/en not_active Expired - Fee Related
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