CN211928430U - Automatic control system for fine sulfur tank in sulfonic acid production device - Google Patents
Automatic control system for fine sulfur tank in sulfonic acid production device Download PDFInfo
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- CN211928430U CN211928430U CN202020620945.4U CN202020620945U CN211928430U CN 211928430 U CN211928430 U CN 211928430U CN 202020620945 U CN202020620945 U CN 202020620945U CN 211928430 U CN211928430 U CN 211928430U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses an automatic control system of a fine sulfur tank in a sulfonic acid making device, which comprises a fine sulfur tank (1); the fine sulfur tank (1) is provided with a temperature sensor (2) and a liquid level sensor (3), and the fine sulfur tank (1) is provided with a liquid inlet sulfur pipe (11) and a liquid sulfur heat tracing coil pipe (12); an electric ball valve C2 is arranged at the air inlet end of the liquid sulfur heat tracing coil pipe (12), and the temperature sensor (2) is connected with the electric ball valve C2 through a temperature comparison control circuit to control the on-off of the electric ball valve; the liquid inlet sulfur pipe (11) is provided with a heat tracing electric ball valve C1, the liquid level sensor (3) is a magnetic induction liquid level meter, the fine sulfur groove (1) is also provided with a floating ball device, the floating ball device pushes a magnetic float of the magnetic induction liquid level meter to slide on the detection pipe, and the magnetic induction liquid level meter is connected with the heat tracing electric ball valve C1 through a liquid level comparison control circuit to control the switch of the magnetic induction liquid level meter. The utility model discloses make things convenient for the automatic control of smart sulphur inslot temperature and liquid level, be favorable to protecting the equipment safety in smart sulphur groove.
Description
Technical Field
The utility model relates to a chemical industry equipment technical field especially relates to a smart sulphur groove automatic control system in sour device of sulfonic acid.
Background
The refined sulfur tank in the sulfuric acid making device has the function of flowing the liquid sulfur from the liquid sulfur storage tank into the refined sulfur tank, and the liquid sulfur is sprayed into the sulfur incinerator for combustion through the liquid sulfur pump B arranged on the refined sulfur tank. The control method is characterized in that an operator in an operating room monitors the temperature and the liquid level of the liquid sulfur in the fine sulfur tank through an upper computer display interface of a DCS system, and when the liquid level and the temperature in the tank are found to be changed, the operator communicates with a field patrol operator through an interphone to adjust a corresponding manual valve to complete corresponding adjustment.
The defects of the prior art are that when the manual valve is manually operated, the hemp skin is careless or the energy is not concentrated, the energy is limited, and when the manual valve is loosened, the following problems can occur, the temperature fluctuation of the liquid sulfur in the fine sulfur tank is large, and the liquidity of the liquid sulfur is best when the temperature of the liquid sulfur is controlled between 130 ℃ and 150 ℃; when the temperature exceeds the normal control temperature range, the liquid sulfur conveying is influenced, and the blockage of a liquid sulfur spray gun and the damage of a liquid sulfur pump can be caused in serious cases, even a motor for driving the liquid sulfur pump is burnt; when the liquid sulfur liquid level was crossed lowly, can lead to no liquid sulfur burning in the follow-up sulfur burning furnace, and influence production to can lead to liquid sulfur pump empty pump operation and damage, when the gap on the pot cover of smart sulphur groove spills over, just cause the waste of production data, perhaps lead to patrolling and examining the life safety accident that personnel's foot was scalded when spilling over night even. To prevent such a situation, it is then necessary to invent an automatic control system for the sulfur refining tank.
SUMMERY OF THE UTILITY MODEL
In view of at least one defect of the prior art, the utility model aims at providing an accurate sulphur groove automatic control system among sour device of sulphur system makes things convenient for the automatic control of accurate sulphur inslot temperature and liquid level, is favorable to protecting the equipment safety in accurate sulphur groove.
In order to achieve the above purpose, the utility model adopts the following technical scheme: an automatic control system for a fine sulfur tank in a sulfonic acid making device comprises the fine sulfur tank; the fine sulfur tank is provided with a temperature sensor and a liquid level sensor, the temperature sensor and the liquid level sensor are connected with a DCS (distributed control system), and the fine sulfur tank is provided with a liquid sulfur inlet pipe, a liquid sulfur heat tracing coil pipe and a fine sulfur pump B;
the key point is that the air inlet end of the liquid sulfur heat tracing coil pipe is provided with an electric ball valve C2, and the temperature sensor is connected with the electric ball valve C2 through a temperature comparison control circuit to control the electric ball valve C2 to be switched on and off; the feed liquor sulphur pipe is provided with companion's heat electric ball valve C1, level sensor is the magnetic induction level gauge, the smart sulphur groove still is provided with the floater device, the floater device includes floater, push rod, slide and support, the floater sets up in the smart sulphur groove, the top of floater links to each other with the lower extreme of push rod, the upper end of push rod upwards wears out smart sulphur groove back and connects the slide, the top surface at smart sulphur groove is fixed through the support to the casing of magnetic induction level gauge, slide processing has the trepanning, the slide passes through the trepanning slip cap to be established outside the detection pipe of magnetic induction level gauge, the detection pipe still overlaps there is the magnetism float, the slide links firmly with the magnetism float and promotes it and slides on the detection pipe, the magnetic induction level gauge is through liquid level comparison control circuit connection companion's heat electric ball valve C1.
The temperature sensor is used for detecting the temperature in the fine sulfur tank and transmitting the temperature to the DCS, and the liquid level sensor is used for detecting the liquid sulfur level position in the fine sulfur tank and transmitting the liquid sulfur level position to the DCS.
The DCS is arranged in the operating room, and an operator in the operating room monitors the temperature and the liquid level of the liquid sulfur in the fine sulfur tank through an upper computer display interface of the DCS.
The liquid sulfur heat tracing coil is used for heating liquid sulfur in the fine sulfur tank, and the liquid sulfur inlet pipe is used for connecting a liquid sulfur storage tank and inputting the liquid sulfur into the fine sulfur tank; the inlet of the liquid sulfur heat tracing coil is used for inputting low-pressure heating steam, and the outlet of the liquid sulfur heat tracing coil is connected to the condensation water tank;
and the refined sulfur pump B is used for drawing liquid sulfur in the refined sulfur tank and spraying the liquid sulfur into the sulfur incinerator for combustion.
The temperature sensor is connected with an electric ball valve C2 through a temperature comparison control circuit to control the switch of the electric ball valve C2; the temperature sensor detects the detected temperature data in the fine sulfur tank and sends the detected temperature data to the temperature comparison control circuit, the temperature comparison control circuit compares the detected temperature data with a temperature data threshold, when the detected temperature data is greater than the set temperature data threshold, the electric ball valve C2 is controlled to be closed, heating steam is stopped being input to the liquid sulfur heat tracing coil pipe, and the fine sulfur tank is stopped being heated; and when the temperature is lower than the set temperature data threshold, controlling the electric ball valve C2 to be opened, and inputting heating steam to the liquid sulfur heat tracing coil.
The shell of the magnetic induction liquid level meter is fixed on the top surface of the fine sulfur tank through a bracket, wherein the floating ball is a self-made floating ball and floats on the surface of liquid sulfur in the fine sulfur tank;
on the contrary, when the surface of the liquid sulfur descends, the floating ball pushes the sliding plate to move downwards through the push rod, the sliding plate drives the magnetic floater to move downwards, and the magnetic induction liquid level meter outputs a corresponding liquid level signal;
the existing liquid level sensor is directly put into a fine sulfur tank, the temperature in the fine sulfur tank is high, the liquid level sensor is easy to damage, and the magnetic induction liquid level meter is promoted to lift through a self-made floating ball through the structure setting of the floating ball device, so that the magnetic induction liquid level meter is protected.
The liquid level comparison control circuit compares the liquid level signal with a set liquid level signal threshold value, and when the liquid level signal is greater than the set liquid level signal threshold value, the heat tracing electric ball valve C1 is controlled to be closed, and the liquid sulfur is stopped being input into the fine sulfur tank; when the liquid level is less than the set liquid level signal threshold value, the heat tracing electric ball valve C1 is controlled to be opened, and liquid sulfur is input into the fine sulfur tank.
Through the structure, the automatic control of the temperature and the liquid level of the liquid sulfur in the fine sulfur tank is realized.
The temperature sensor is provided with an analog voltage signal output end, the temperature comparison control circuit comprises a first hysteresis comparator, a first switching triode and a first relay, the inverting input end of the first hysteresis comparator is connected with the analog voltage signal output end of the temperature sensor, and the non-inverting input end of the first hysteresis comparator is connected with a first reference voltage; the output end of the first hysteresis comparator is connected with the base electrode of a first switching triode, the first switching triode controls the on-off of a coil of a first relay, one end of an electric ball valve C2 is grounded, the other end of the electric ball valve C2 is connected with one end of a normally open switch of the first relay, and the other end of the normally open switch of the first relay is connected with a power supply;
the magnetic induction liquid level meter is provided with a liquid level voltage signal output end, the liquid level comparison control circuit comprises a second hysteresis comparator, a second switching triode and a second relay, the reverse phase input end of the second hysteresis comparator is connected with the liquid level voltage signal output end of the magnetic induction liquid level meter, and the non-phase input end of the second hysteresis comparator is connected with a second reference voltage; the base of second switch triode is connected to the output of second hysteresis comparator, and the coil break-make electricity of second relay is controlled to the second switch triode, and the one end ground connection of heat tracing electric ball valve C1, the one end of the normally open switch of second relay is connected to the other end of heat tracing electric ball valve C1, and the power is connected to the other end of the normally open switch of second relay.
The temperature comparison control circuit can adopt a single temperature data threshold, the comparison circuit structure of the single temperature data threshold is simpler, but the electric ball valve C2 is switched more frequently, so that the service life of the electric ball valve C2 is influenced;
the temperature comparison control circuit is provided with a first hysteresis comparator, the first hysteresis comparator is provided with a lower limit temperature data threshold and an upper limit temperature data threshold, when the detection data of the temperature sensor is smaller than the lower limit temperature data threshold, the output end of the first hysteresis comparator outputs positive voltage, a first switch triode is conducted, the first switch triode controls a coil of a first relay to be electrified, a normally open switch of the first relay is closed, and an electric ball valve C2 is opened to heat the fine sulfur tank; when the temperature in the fine sulfur tank is higher than the upper limit temperature data threshold, the output end of the first hysteresis comparator outputs negative voltage, the first switching triode is cut off, the first switching triode controls the coil of the first relay to be powered off, the normally open switch of the first relay is disconnected, the electric ball valve C2 is closed, and the fine sulfur tank is stopped being heated; when the temperature is lower than the lower limit temperature data threshold, heating the fine sulfur tank;
the effect of the circuit is to reduce the number of times of opening and closing the electric ball valve C2. The lower temperature data threshold and the upper temperature data threshold are between 130 degrees and 150 degrees.
The liquid level comparison control circuit can adopt a single liquid level signal threshold, the comparison circuit structure of the single liquid level signal threshold is simpler, but the heat tracing electric ball valve C1 is switched more frequently, and the service life of the heat tracing electric ball valve C1 is influenced;
the liquid level comparison control circuit is provided with a second hysteresis comparator, the second hysteresis comparator is provided with a lower limit liquid level signal threshold value and an upper limit liquid level signal threshold value, when the detection data of the magnetic induction liquid level meter is smaller than the lower limit liquid level signal threshold value, the output end of the second hysteresis comparator outputs positive voltage, a second switch triode is conducted, the second switch triode controls a coil of a second relay to be electrified, a normally open switch of the second relay is closed, a heat tracing electric ball valve C1 is opened, and liquid sulfur is added into the fine sulfur tank; when the detection data of the magnetic induction liquid level meter is larger than the upper limit liquid level signal threshold value, the output end of the second hysteresis comparator outputs negative voltage, the second switching triode is cut off, the second switching triode controls the coil of the second relay to be powered off, the normally open switch of the second relay is switched off, the heat tracing electric ball valve C1 is closed, and the liquid sulfur is stopped being added into the fine sulfur tank; when the detection data of the magnetic induction liquid level meter is smaller than the lower limit liquid level signal threshold value, adding liquid sulfur into the fine sulfur tank;
the effect of the circuit is that the times of opening and closing the heat tracing electric ball valve C1 are reduced.
The other end of the normally open switch of the first relay is connected with a power supply through a first manual switch SB 1; the other end of the electric ball valve C2 is also connected with a power supply through a second manual switch SB 2;
the other end of the normally open switch of the second relay is connected with a power supply through a third manual switch SB 3; the other end of the heat tracing electric ball valve C1 is also connected with a power supply through a fourth manual switch SB 4.
Through the circuit arrangement, when the temperature comparison control circuit is in failure, the first manual switch SB1 can be switched off, the electric ball valve C2 is not controlled by the temperature comparison control circuit, and the switch of the electric ball valve C2 can be controlled through the second manual switch SB 2.
When the liquid level comparison control circuit has a fault, the third manual switch SB3 can be switched off, the heat tracing electric ball valve C1 is not controlled by the liquid level comparison control circuit, and the switch of the heat tracing electric ball valve C1 can be controlled by the fourth manual switch SB 4.
The floating ball and the push rod are both made of 316L stainless steel.
The floating ball and the push rod are both made of 316L stainless steel, so that the corrosion resistance is good.
The fine sulfur groove comprises a groove cover and a groove body, wherein a floating ball through hole is formed in the groove cover, the diameter of the floating ball through hole is larger than that of the floating ball, a flange cover is arranged on the floating ball through hole and detachably connected with the groove cover, a push rod through hole is formed in the flange cover, and the upper end of the push rod is detachably connected with the sliding plate.
The capping closes the upper end at the cell body, sets up through foretell structure, when being stained with sulphur on the floater, pulls down the upper end of push rod from the slide, lifts the blind flange off from the capping, takes out the floater, clears away the surperficial dirt of floater, prevents that the dirt on floater surface from influencing the detection precision of magnetic induction level gauge, and the clearance is accomplished the back, fixes the blind flange on the capping again, fixes the upper end of push rod on the slide.
And the fine sulfur pump B is connected with an alternating current power supply through a frequency converter.
The speed of the motor of the fine sulfur pump B can be adjusted through the frequency converter, so that the flow of the fine sulfur pump B is adjusted.
The sulphur and the sulphur mentioned in the application refer to sulphur.
The utility model has the obvious effects that the utility model provides an automatic control system of a fine sulfur tank in a sulfonic acid production device, which is convenient for the automatic control of the temperature and the liquid level in the fine sulfur tank and is beneficial to protecting the equipment safety of the fine sulfur tank.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a first circuit diagram of a temperature comparison control circuit;
FIG. 4 is a second circuit diagram of the temperature comparison control circuit;
FIG. 5 is a circuit diagram of a liquid level comparison control circuit;
fig. 6 is a circuit diagram of the DCS control circuit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-6, an automatic control system for a sulfur refining tank in a sulfuric acid production device comprises a sulfur refining tank 1; the fine sulfur tank 1 is provided with a temperature sensor 2 and a liquid level sensor 3, the temperature sensor 2 and the liquid level sensor 3 are connected with a DCS system 4, and the fine sulfur tank 1 is provided with a liquid sulfur inlet pipe 11, a liquid sulfur heat tracing coil pipe 12 and a fine sulfur pump B13;
an electric ball valve C2 is arranged at the air inlet end of the liquid sulfur heat tracing coil 12, and the temperature sensor 2 is connected with an electric ball valve C2 through a temperature comparison control circuit 21 to control the electric ball valve C2 to be switched on and off; the liquid inlet sulfur pipe 11 is provided with a heat tracing electric ball valve C1, the liquid level sensor 3 is a magnetic induction liquid level meter, the refined sulfur tank 1 is further provided with a floating ball device 30, the floating ball device 30 comprises a floating ball 31, a push rod 32, a sliding plate 33 and a support 34, the floating ball 31 is arranged in the refined sulfur tank 1, the top end of the floating ball 31 is connected with the lower end of the push rod 32, the upper end of the push rod 32 upwards penetrates out of the refined sulfur tank 1 and then is connected with the sliding plate 33, the magnetic induction liquid level meter is vertically arranged above the refined sulfur tank 1, the shell of the magnetic induction liquid level meter is fixed on the top surface of the refined sulfur tank 1 through the support 34, the sliding plate 33 is processed with a trepanning, the sliding plate 33 is sleeved outside a detection pipe 3a of the magnetic induction liquid level meter through a trepanning sliding sleeve, the detection pipe 3a is further sleeved with a magnetic float 3b, the sliding plate 33 is fixedly connected with the, controlling the switch of the heat tracing electric ball valve C1.
A heat tracing electric ball valve C1 is a heat preservation electric ball valve C1.
The utility model changes the manual valve at the air inlet end of the raw liquid sulfur heat tracing coil pipe 12 into an electric ball valve C2; the manual valve of the original liquid sulfur pipe 11 is replaced by a heat tracing electric ball valve C1;
one path of the signal of the temperature sensor 2 is transmitted to the DCS 4 for displaying, and the other path of the signal is output to the temperature comparison control circuit 21.
The temperature sensor 2 with the flange is inserted into the fine sulfur groove 1 from the top of the fine sulfur groove 1 and is fixed on the fine sulfur groove 1 by screws.
One path of the signal of the magnetic induction liquid level meter is transmitted to the DCS system 4 for displaying, and the other path of the signal is output to the liquid level comparison control circuit 35.
The temperature comparison control circuit 21 and the liquid level comparison control circuit 35 are arranged in a self-made control box, which is not shown in the figure.
Wherein, DCS system 4 sets up in the control chamber, and the operating personnel in the control chamber passes through DCS system 4's host computer display interface and monitors the temperature and the liquid level of liquid sulphur in smart sulphur groove 1.
The liquid sulfur heat tracing coil 12 is used for heating the liquid sulfur in the fine sulfur tank 1; the liquid sulfur inlet pipe 11 is used for connecting a liquid sulfur storage tank and inputting liquid sulfur into the fine sulfur tank 1; the inlet of the liquid sulfur heat tracing coil 12 is used for inputting low-pressure heating steam, and the outlet of the liquid sulfur heat tracing coil 12 is connected to a condensation water tank;
the refined sulfur pump B13 is used for drawing liquid sulfur in the refined sulfur tank 1 to be sprayed into the sulfur burning furnace for burning.
The temperature sensor 2 is connected with an electric ball valve C2 through a temperature comparison control circuit 21 and controls the switch of the electric ball valve C2; the temperature sensor 2 detects the detected temperature data in the fine sulfur tank 1 and sends the detected temperature data to the temperature comparison control circuit 21, the temperature comparison control circuit 21 compares the detected temperature data with a temperature data threshold, and when the detected temperature data is greater than the set temperature data threshold, the electric ball valve C2 is controlled to be closed, heating steam is stopped being input to the liquid sulfur heat tracing coil 12, and the fine sulfur tank 1 is stopped being heated; when the temperature is lower than the set temperature data threshold value, the electric ball valve C2 is controlled to be opened, and heating steam is input into the liquid sulfur heat tracing coil 12.
A shell of the magnetic induction liquid level meter is fixed on the top surface of the fine sulfur tank 1 through a bracket 34, wherein the floating ball 31 is a self-made floating ball and floats on the surface of liquid sulfur in the fine sulfur tank 1, when the surface of the liquid sulfur rises, the floating ball 31 pushes the sliding plate 33 to move upwards through the push rod 32, the sliding plate 33 drives the magnetic float 3b to move upwards, and the magnetic induction liquid level meter outputs a corresponding liquid level signal;
on the contrary, when the surface of the liquid sulfur descends, the floating ball 31 pushes the sliding plate 33 to move downwards through the push rod 32, the sliding plate 33 drives the magnetic float 3b to move downwards, and the magnetic induction liquid level meter outputs a corresponding liquid level signal;
the existing liquid level sensor 3 is directly put into the fine sulfur tank 1 with the liquid level sensor 3, the temperature in the fine sulfur tank 1 is higher, the liquid level sensor 3 is easy to damage, and the magnetic induction liquid level meter is pushed to lift through the self-made floating ball through the structure setting of the floating ball device 30, so that the magnetic induction liquid level meter is protected.
The liquid level comparison control circuit 35 compares the liquid level signal with a set liquid level signal threshold value, and when the liquid level signal is greater than the set liquid level signal threshold value, the heat tracing electric ball valve C1 is controlled to be closed, and the liquid sulfur is stopped being input into the fine sulfur tank 1; when the liquid level is less than the set liquid level signal threshold value, the heat tracing electric ball valve C1 is controlled to be opened, and liquid sulfur is input into the fine sulfur tank 1.
The temperature sensor 2 is provided with an analog voltage signal output end, the temperature comparison control circuit 21 comprises a first hysteresis comparator, a first switching triode Q1 and a first relay, the inverting input end of the first hysteresis comparator is connected with the analog voltage signal output end of the temperature sensor 2, and the non-inverting input end of the first hysteresis comparator is connected with a first reference voltage; the output end of the first hysteresis comparator is connected with the base electrode of a first switching triode Q1, the first switching triode Q1 controls the on-off of a coil J1-1 of a first relay, one end of an electric ball valve C2 is grounded, the other end of the electric ball valve C2 is connected with one end of a normally-open switch J1-2 of the first relay, and the other end of the normally-open switch J1-2 of the first relay is connected with a power supply;
the magnetic induction liquid level meter is provided with a liquid level voltage signal output end, the liquid level comparison control circuit 35 comprises a second hysteresis comparator, a second switching triode Q2 and a second relay, the inverting input end of the second hysteresis comparator is connected with the liquid level voltage signal output end of the magnetic induction liquid level meter, and the non-inverting input end of the second hysteresis comparator is connected with a second reference voltage; the output end of the second hysteresis comparator is connected with the base electrode of a second switching triode Q2, the second switching triode Q2 controls the on-off of a coil J2-1 of a second relay, one end of a heat tracing electric ball valve C1 is grounded, the other end of the heat tracing electric ball valve C1 is connected with one end of a normally open switch J2-2 of the second relay, and the other end of the normally open switch J2-2 of the second relay is connected with a power supply.
The output current of the magnetic induction liquid level meter is converted into a corresponding voltage signal through a resistor R21.
The temperature comparison control circuit 21 can adopt a single temperature data threshold, the comparison circuit structure of the single temperature data threshold is simpler, but the electric ball valve C2 is switched more frequently, so that the service life of the electric ball valve C2 is influenced;
the temperature comparison control circuit 21 is provided with a first hysteresis comparator, the first hysteresis comparator is provided with a lower limit temperature data threshold and an upper limit temperature data threshold, when the detection data of the temperature sensor 2 is smaller than the lower limit temperature data threshold, the output end of the first hysteresis comparator outputs positive voltage, a first switching triode Q1 is conducted, a first switching triode Q1 controls a coil J1-1 of a first relay to be electrified, a normally open switch J1-2 of the first relay is closed, an electric ball valve C2 is opened, and the fine sulfur tank 1 is heated; when the temperature in the fine sulfur tank 1 is higher than the upper limit temperature data threshold, the output end of the first hysteresis comparator outputs negative voltage, the first switching triode Q1 is cut off, the first switching triode Q1 controls the coil J1-1 of the first relay to be powered off, the normally open switch J1-2 of the first relay is switched off, the electric ball valve C2 is closed, and the fine sulfur tank 1 is stopped being heated; when the temperature is lower than the lower limit temperature data threshold, heating the fine sulfur tank 1;
the lower limit temperature data threshold, the upper limit temperature data threshold, and the detection data of the temperature sensor 2 are referred to as voltage signals herein.
The effect of the circuit is to reduce the number of times of opening and closing the electric ball valve C2. The lower temperature data threshold and the upper temperature data threshold are between 130 degrees and 150 degrees, such as the lower temperature data threshold of 135 degrees and the upper temperature data threshold of 145 degrees.
The normally open switch J1-2 of the first relay applies a control signal to the actuator of the power ball valve C2.
The temperature sensor 2 can be a platinum temperature sensor, the platinum temperature sensor outputs corresponding analog voltage signals through a bridge temperature measuring circuit, and the first hysteresis comparator is a hysteresis comparator made of integrated operational amplifier. The lower limit temperature data threshold and the upper limit temperature data threshold can be obtained by adjusting parameters of each element of the first hysteresis comparator. The bridge type temperature measuring circuit is a mature circuit and is not shown in the figure.
The temperature sensor 2 may also be an AD590 temperature sensor, and the AD590 temperature sensor outputs a corresponding analog voltage signal through conversion by a conversion resistor R14. The output voltage signal may be adjusted by the parameters of resistor R14. The AD590 temperature sensor is provided with a stainless steel housing.
The liquid level comparison control circuit 35 can adopt a single liquid level signal threshold, the comparison circuit structure of the single liquid level signal threshold is simpler, but the heat tracing electric ball valve C1 is switched more frequently, and the service life of the heat tracing electric ball valve C1 is influenced;
the liquid level comparison control circuit 35 is provided with a second hysteresis comparator, the second hysteresis comparator is provided with a lower limit liquid level signal threshold and an upper limit liquid level signal threshold, when the detection data of the magnetic induction liquid level meter is smaller than the lower limit liquid level signal threshold, the output end of the second hysteresis comparator outputs positive voltage, a second switch triode Q2 is conducted, a second switch triode Q2 controls a coil J2-1 of a second relay to be electrified, a normally open switch J2-2 of the second relay is closed, a heat tracing electric ball valve C1 is opened, and liquid sulfur is added into the fine sulfur tank 1; when the detection data of the magnetic induction liquid level meter is larger than the upper limit liquid level signal threshold value, the output end of the second hysteresis comparator outputs negative voltage, the second switching triode Q2 is cut off, the second switching triode Q2 controls the coil J2-1 of the second relay to be powered off, the normally open switch J2-2 of the second relay is switched off, the heat tracing electric ball valve C1 is switched off, and the liquid sulfur is stopped being added into the fine sulfur tank 1; when the detection data of the magnetic induction liquid level meter is smaller than the lower limit liquid level signal threshold value, adding liquid sulfur into the fine sulfur tank 1;
the effect of the circuit is that the times of opening and closing the heat tracing electric ball valve C1 are reduced.
The lower limit liquid level signal threshold value, the upper limit liquid level signal threshold value and the detection data of the magnetic induction liquid level meter are all voltage signals.
The normally open switch J2-2 of the second relay applies a control signal to the actuator of the heat tracing electric ball valve C1.
The second hysteresis comparator is a hysteresis comparator made of an integrated operational amplifier. The lower limit liquid level signal threshold and the upper limit liquid level signal threshold can be obtained by adjusting parameters of all elements of the first hysteresis comparator.
The other end of a normally open switch J1-2 of the first relay is connected with a power supply through a first manual switch SB 1; the other end of the electric ball valve C2 is also connected with a power supply through a second manual switch SB 2;
the other end of a normally open switch J2-2 of the second relay is connected with a power supply through a third manual switch SB 3; the other end of the heat tracing electric ball valve C1 is also connected with a power supply through a fourth manual switch SB 4.
Through the circuit arrangement, when the temperature comparison control circuit 21 has a fault, the first manual switch SB1 can be switched off, the electric ball valve C2 is not controlled by the temperature comparison control circuit 21, and the switch of the electric ball valve C2 can be controlled through the second manual switch SB 2. If no fault occurs, the first manual switch SB1 is closed, and the second manual switch SB2 is opened, so that automatic control is realized.
When the liquid level comparison control circuit 35 has a fault, the third manual switch SB3 can be switched off, the heat tracing electric ball valve C1 is not controlled by the liquid level comparison control circuit 35, and the switch of the heat tracing electric ball valve C1 can be controlled by the fourth manual switch SB 4. If no fault occurs, the third manual switch SB3 should be closed and the fourth manual switch SB4 should be opened, so that automatic control is realized.
The floating ball 31 and the push rod 32 are both made of 316L stainless steel.
The floating ball 31 and the push rod 32 are both made of 316L stainless steel, and have good corrosion resistance.
The fine sulfur groove 1 comprises a groove cover 1a and a groove body 1b, the groove cover 1a is provided with a floating ball via hole 311, the aperture of the floating ball via hole 311 is larger than the diameter of a floating ball 31, the floating ball via hole 311 is provided with a flange cover 312, the flange cover 312 is detachably connected with the groove cover 1a, the flange cover 312 is provided with a push rod via hole 313 through which a push rod 32 passes, and the upper end of the push rod 32 is detachably connected with a sliding plate 33.
The groove cover 1a is also provided with an air outlet pipe 1c, and the upper end of the air outlet pipe 1c can be connected with a gas filter. The liquid sulfur inlet pipe 11 and the liquid sulfur heat tracing coil pipe 12 both extend into the inner cavity of the tank body 1b from a through hole arranged at the top of the tank cover 1a, the upper end of the temperature sensor 2 is fixed on the tank cover 1a, and the lower end of the temperature sensor extends into the tank body 1b and is positioned below the lower limit liquid sulfur liquid level of the tank body 1 b. The fine sulfur pump B13 is also arranged on the tank cover 1a, the motor of the fine sulfur pump B13 is arranged on the upper surface of the tank cover 1a, and the pump body of the fine sulfur pump B13 is positioned below the lower limit liquid sulfur liquid level of the tank body 1B.
The upper end at cell body 1b is closed in the lid of capping 1a to can dismantle with cell body 1b and be connected, through foretell structure setting, when gluing sulphur on floater 31, pull down the upper end of push rod 32 from slide 33, lift flange cover 312 off from capping 1a, take out floater 31, clear away the dirt on floater 31 surface, prevent that the dirt on floater 31 surface from influencing the detection precision of magnetic induction level gauge, after the clearance is accomplished, fix flange cover 312 on capping 1a again, fix the upper end of push rod 32 on slide 33.
And the fine sulfur pump B13 is connected with an alternating current power supply through a frequency converter.
The speed of the motor of the fine sulfur pump B13 can be adjusted through the frequency converter, so that the flow of the fine sulfur pump B13 is adjusted. The frequency converter adopts the existing mature product and is selected according to the motor of the refined sulfur pump B13.
The heat tracing electric ball valve C1 and the electric ball valve C2 are stainless steel electric ball valves.
As shown in fig. 6, the temperature comparison control circuit 21 and the liquid level comparison control circuit 35 are DCS control circuits, each of which is provided with an upper computer and comprises a fine sulfur pump B13 frequency modulation control module, a liquid sulfur temperature control module and a liquid sulfur liquid level control module. The frequency modulation control program of the fine sulfur pump B13 consists of an input end, a manual operator module HC and an output end, when a start button of a field start-stop button box is pressed, a frequency converter in a distribution room starts to gradually run to a set frequency to drive a motor of the fine sulfur pump B13 to run, the motor drives a fine sulfur pump B13 to start to run to convey liquid sulfur to a sulfur incinerator for combustion, and an operator inputs a required frequency value according to production practice through a virtual input end I through an upper computer at the momentVirtual 1Adjustment of fine sulfur pump B13 transmitted to DCS control circuitThe M end of a manual operator HC of the frequency control module is transmitted to the frequency converter from the output end of Q11 through the operation processing of the manual operator HC, so as to change the frequency of the frequency converter and further control the amount of liquid sulfur transmitted to the sulfur incinerator by the fine sulfur pump B13, thereby realizing the purpose of remote control. The liquid sulfur temperature control module consists of an input end, a regulator module PID and an output end, and the liquid sulfur in the fine sulfur tank 1 is real-time temperature and is input by a temperature sensor 2 through a physical input end IExample 1The control temperature value is transmitted to a PV end of a PID module, and an operator controls the temperature value according to the process requirement through a virtual input end I by an upper computerVirtual 3The signals are transmitted to an SV end of a PID module, and an operator in the working state of the PID module can automatically switch the hand signals through a virtual input end I through an upper computer according to actual needsVirtual 2When the temperature of the liquid sulfur in the fine sulfur tank 1 is continuously and automatically controlled within the range of process requirements, the temperature is transmitted to an A/M end of a PID module, when the temperature is in an automatic state A, signals input by an SV end and a PV end of the PID module are compared and subjected to PID operation processing in the module, and the operation processing signals are transmitted to an electric ball valve C2 through an output end Q21 to control the steam conveying quantity to a heat tracing coil pipe 12; when the valve is in a manual state M, signals input by the SV end and the PV end of the PID module cannot be compared, and at the moment, an operator can only manually input a valve opening value through an upper computer and passes through the virtual terminal IVirtual 4The opening value signal is transmitted to the MV end of the PID module, the operation processing is carried out in the module, and the operation processing signal is transmitted to the electric ball valve C2 through the output end Q21 to control the steam delivery volume to the heat tracing coil pipe 12, so that the continuous control of the liquid sulfur temperature in the fine sulfur tank 1 through remote manual control is realized. The PID module is always in the automatic state A in the ordinary liquid sulfur temperature control regulator, and is in the manual state M in order to ensure the continuous production when meeting the condition to be processed. The liquid sulfur level control in the fine sulfur tank 1 adopts a two-position control method, which comprises an input end, a high liquid level comparison module GT, a low liquid level comparison module LT and an SR trigger module, wherein an operator sets the high liquid level and the low liquid level through a virtual input end I by an upper computerVirtual 5And IVirtual 6The actual liquid level of the liquid sulfur in the fine sulfur tank 1 is detected by a liquid level sensor 3 and is transmitted to the GV end of the GT module and the LV end of the LT module, and the actual liquid level is converted into the liquid sulfurConverted into electric signal and passed through physical input end IExample 2And IExample 3The PV ends of the GT module and the LT module are respectively transmitted, the two groups of PV signals are respectively compared with GV and LV set signals of the GT module and the LT module, then are processed by the SR trigger module, and the processed signals are processed by the output end Q31 switching signal to control the switch of the heat tracing electric ball valve C1, so that the liquid level of the liquid sulfur in the fine sulfur tank 1 can be ensured to be timely opened when the liquid sulfur in the liquid sulfur storage tank reaches a value lower than the set value, and the liquid sulfur in the liquid sulfur storage tank can be supplemented into the fine sulfur tank 1 by the heat tracing electric ball valve C1; when the liquid sulfur liquid level in the fine sulfur tank 1 is supplemented to reach a set high limit value, the heat tracing electric ball valve C1 can be closed in time, the overflow of the liquid sulfur from the fine sulfur tank 1 is avoided, and the continuous operation of the production device is finally ensured. The third is the execution link. The frequency converter of the distribution room receives a signal of a manual operator HC in a DCS control circuit, and the frequency conversion speed regulation controls the sulfur spraying amount of the sulfur burning furnace by the fine sulfur pump B13; the electric ball valve C2 receives a signal from a temperature adjusting module PID in the DCS system to control the steam amount entering the heat tracing coil 12, so as to ensure that the temperature of the liquid sulfur in the fine sulfur tank 1 is within a process specified range; the heat tracing electric ball valve C1 receives a switching signal sent by a liquid level control group consisting of a GT module, an LT module and an SR trigger module in the DCS system to control the on-off of the liquid level control group, thereby ensuring that the liquid level of the liquid sulfur in the fine sulfur tank 1 is in a control range and ensuring the continuous production and the good equipment. The full-automatic control system of the fine sulfur tank 1 improves the production efficiency, lightens the labor intensity of operators and reduces the occurrence probability of accidents.
Finally, it is noted that: the above list is only the concrete implementation example of the present invention, and of course those skilled in the art can make modifications and variations to the present invention, and if these modifications and variations fall within the scope of the claims of the present invention and their equivalent technology, they should be considered as the protection scope of the present invention.
Claims (6)
1. An automatic control system of a fine sulfur tank in a sulfonic acid making device comprises a fine sulfur tank (1); the fine sulfur tank (1) is provided with a temperature sensor (2) and a liquid level sensor (3), the temperature sensor (2) and the liquid level sensor (3) are connected with a DCS (distributed control system) system (4), and the fine sulfur tank (1) is provided with a liquid sulfur inlet pipe (11), a liquid sulfur heat tracing coil pipe (12) and a fine sulfur pump B (13);
the device is characterized in that an electric ball valve C2 is arranged at the air inlet end of the liquid sulfur heat tracing coil pipe (12), and the temperature sensor (2) is connected with the electric ball valve C2 through a temperature comparison control circuit (21) to control the electric ball valve C2 to be switched on and off; the liquid inlet sulfur pipe (11) is provided with a heat tracing electric ball valve C1, the liquid level sensor (3) is a magnetic induction liquid level meter, the fine sulfur groove (1) is further provided with a floating ball device (30), the floating ball device (30) comprises a floating ball (31), a push rod (32), a sliding plate (33) and a support (34), the floating ball (31) is arranged in the fine sulfur groove (1), the top end of the floating ball (31) is connected with the lower end of the push rod (32), the upper end of the push rod (32) upwards penetrates out of the fine sulfur groove (1) and then is connected with the sliding plate (33), the shell of the magnetic induction liquid level meter is fixed on the top surface of the fine sulfur groove (1) through the support (34), the sliding plate (33) is processed with a sleeve hole, the sliding plate (33) is sleeved outside the detection pipe (3a) of the magnetic induction liquid level meter through the sleeve hole sliding sleeve, the detection pipe (3a) is further sleeved with a magnetic float (3b), the sliding plate (33), the magnetic induction liquid level meter is connected with a heat tracing electric ball valve C1 through a liquid level comparison control circuit (35) to control the switch of the heat tracing electric ball valve C1.
2. The automatic control system for the fine sulfur tank in the sulfonic acid making device according to claim 1, characterized in that: the temperature sensor (2) is provided with an analog voltage signal output end, the temperature comparison control circuit (21) comprises a first hysteresis comparator, a first switch triode and a first relay, the inverting input end of the first hysteresis comparator is connected with the analog voltage signal output end of the temperature sensor (2), and the non-inverting input end of the first hysteresis comparator is connected with a first reference voltage; the output end of the first hysteresis comparator is connected with the base electrode of a first switching triode, the first switching triode controls the on-off of a coil of a first relay, one end of an electric ball valve C2 is grounded, the other end of the electric ball valve C2 is connected with one end of a normally open switch of the first relay, and the other end of the normally open switch of the first relay is connected with a power supply;
the magnetic induction liquid level meter is provided with a liquid level voltage signal output end, the liquid level comparison control circuit (35) comprises a second hysteresis comparator, a second switching triode and a second relay, the inverting input end of the second hysteresis comparator is connected with the liquid level voltage signal output end of the magnetic induction liquid level meter, and the non-inverting input end of the second hysteresis comparator is connected with a second reference voltage; the base of second switch triode is connected to the output of second hysteresis comparator, and the coil break-make electricity of second relay is controlled to the second switch triode, and the one end ground connection of heat tracing electric ball valve C1, the one end of the normally open switch of second relay is connected to the other end of heat tracing electric ball valve C1, and the power is connected to the other end of the normally open switch of second relay.
3. The automatic control system for the fine sulfur tank in the sulfonic acid making device according to claim 2, characterized in that: the other end of the normally open switch of the first relay is connected with a power supply through a first manual switch SB 1; the other end of the electric ball valve C2 is also connected with a power supply through a second manual switch SB 2;
the other end of the normally open switch of the second relay is connected with a power supply through a third manual switch SB 3; the other end of the heat tracing electric ball valve C1 is also connected with a power supply through a fourth manual switch SB 4.
4. The automatic control system for the fine sulfur tank in the sulfonic acid making device according to claim 1, characterized in that: the floating ball (31) and the push rod (32) are both made of 316L stainless steel.
5. The automatic control system for the fine sulfur tank in the sulfonic acid making device according to claim 1, characterized in that: the fine sulfur groove (1) comprises a groove cover (1a) and a groove body (1b), a floating ball through hole (311) is formed in the groove cover (1a), the diameter of the floating ball through hole (311) is larger than that of a floating ball (31), a flange cover (312) is arranged on the floating ball through hole (311), the flange cover (312) is detachably connected with the groove cover (1a), a push rod through hole (313) through which a push rod (32) passes is arranged on the flange cover (312), and the upper end of the push rod (32) is detachably connected with a sliding plate (33).
6. The automatic control system for the fine sulfur tank in the sulfonic acid making device according to claim 1, characterized in that: and the refined sulfur pump B (13) is connected with an alternating current power supply through a frequency converter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020620945.4U CN211928430U (en) | 2020-04-23 | 2020-04-23 | Automatic control system for fine sulfur tank in sulfonic acid production device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020620945.4U CN211928430U (en) | 2020-04-23 | 2020-04-23 | Automatic control system for fine sulfur tank in sulfonic acid production device |
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| CN211928430U true CN211928430U (en) | 2020-11-13 |
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