CN213172616U - Solution concentration control device for oxygen cathode electrolytic cell complete system - Google Patents
Solution concentration control device for oxygen cathode electrolytic cell complete system Download PDFInfo
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- CN213172616U CN213172616U CN202022037819.9U CN202022037819U CN213172616U CN 213172616 U CN213172616 U CN 213172616U CN 202022037819 U CN202022037819 U CN 202022037819U CN 213172616 U CN213172616 U CN 213172616U
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Abstract
The utility model discloses a solution concentration control device for an oxygen cathode electrolytic cell complete system, which comprises an electrolytic cell, a circulating tank, a circulating pump and a material supply pump; the automatic temperature measuring device comprises a controller, two pressure transmitters and a temperature measuring device, wherein the two pressure transmitters are respectively connected with a first pressure transmitter below the circulating tank and a second pressure transmitter above the circulating tank, the output end of the first pressure transmitter, the output end of the second pressure transmitter and the output end of the temperature measuring device are electrically connected with the input end of the controller, the output end of the controller is connected with the control end of the material replenishing pump, the controller is used for calculating the real-time concentration of liquid in the circulating tank according to data collected by the first pressure transmitter, the second pressure transmitter and the temperature measuring device, and then the material replenishing quantity of the material replenishing pump is controlled according to preset control logic so as to ensure that the concentration of the liquid in the circulating tank is within a preset range. The measurement precision is improved; the cost is saved; the installation, debugging and maintenance are convenient; the failure rate decreases.
Description
Technical Field
The utility model belongs to the technical field of liquid concentration measurement technique and specifically relates to a be applied to the measurement that liquid concentration and density and temperature have the liquid concentration of certain relation, specifically relate to a solution concentration control device for oxygen cathode electrolysis trough integrated system.
Background
The oxygen cathode electrolytic cell is a novel electrolytic device utilizing oxygen reduction reaction, and is gradually applied to the fields of producing caustic soda and chlorine by electrolyzing saturated salt water, producing hydrogen peroxide by an electrolytic method and the like. The cathode material of the oxygen cathode electrolytic cell adopts an air electrode material, and oxygen reacts on a catalyst of the air electrode as follows:
（1）O2 + 2H2O + 4e- = 4OH- +0.401V vs SHE
or (2) O2 + 2H2O + 2e- = 2OH- + H2O2 -0.126V vs SHE
The traditional process for producing caustic soda and chlorine by electrolyzing saturated salt water adopts the following steps:
（3）2H2O +2e- = 2OH- + H2 -0.8277V
in contrast, (1) the reaction was 1.229V higher than the standard equilibrium potential of (3) the reaction, and (2) the reaction was 0.825V higher than the standard equilibrium potential of (3) the reaction, indicating that the total voltage of the oxygen cathode cell can be greatly reduced if the air electrode technique is employed. The complete system constructed around the oxygen cathode electrolytic cell can help the chlor-alkali industry and the hydrogen peroxide electrolysis industry to reduce production energy consumption, accords with the industry guidance of the national related clean energy-saving technology, and has wide application field.
In order to ensure the stable operation of the oxygen cathode electrolytic cell complete system, the process requires that the concentration of the solution entering the electrolytic cell is relatively stable and the components are consistent. Therefore, companies need to develop a solution concentration control device, which can change the material supply speed according to the real-time change of the solution concentration, so as to ensure the stability of the solution concentration.
In the prior art, when a large-scale chemical plant measures the concentration of liquid, a tuning fork densitometer, a nuclear densitometer or an optical densitometer is generally adopted to indirectly measure the concentration, but the devices for measuring the concentration are very expensive, and the cost of each device is generally between 5 and 10 thousands. The existing concentration measurement method with high relative cost performance is to measure the concentration indirectly by using a differential pressure method to measure the density, an adopted instrument is a double-flange transmitter, the price is generally between 1 ten thousand and 1.5 ten thousand (for example, a cross-river double flange, an E + H double flange and the like), but the measurement precision of the measurement device is not ideal, because the density of the silicon oil filled in a positive pressure chamber and a negative pressure chamber of the measurement device is slightly changed due to the change of the temperature, the change of the density of the silicon oil can cause the change of zero migration quantity, thereby causing the inaccurate measured differential pressure to influence the measurement precision of the density, and further causing the poor concentration measurement precision; in addition, the instrument is provided with a flange and a capillary tube, so that the installation is complex, the debugging and the maintenance can be carried out only by means of a special tool 475, the debugging and the maintenance are inconvenient, when the instrument breaks down, whether the fault is detected by positive pressure or negative pressure is difficult to judge under the condition of not using the special tool 475, and the maintenance difficulty is increased.
SUMMERY OF THE UTILITY MODEL
The utility model provides a solution concentration control device for an oxygen cathode electrolytic cell complete system to overcome the defects of the prior art.
The utility model overcomes the technical scheme that its technical problem adopted is:
a solution concentration control device for an oxygen cathode electrolytic cell complete system at least comprises an electrolytic cell, a circulating tank, a circulating pump and a material replenishing pump, wherein the outlet end of the circulating pump is connected with the inlet of the electrolytic cell, the outlet of the electrolytic cell is connected with the circulating liquid inlet end of the circulating tank, the circulating liquid outlet end of the circulating tank is connected with the inlet end of the circulating pump, and the outlet end of the material replenishing pump is connected between the circulating tank and the circulating pump; also comprises a controller, two pressure transmitters for measuring the pressure of the liquid in the circulating tank and a temperature measuring device for measuring the temperature of the liquid in the circulating tank, wherein the two pressure transmitters are respectively a first pressure transmitter connected below the circulating tank and a second pressure transmitter connected above the circulating tank, the two pressure transmitters and the temperature measuring device are both contacted with the liquid in the circulating tank, the output end of the first pressure transmitter, the output end of the second pressure transmitter and the output end of the temperature measuring device are all electrically connected with the input end of the controller, the output end of the controller is connected with the control end of the material replenishing pump, the controller is used for calculating the real-time concentration of the liquid in the circulating tank according to the data collected by the first pressure transmitter, the second pressure transmitter and the temperature measuring device, and then controlling the material supply amount of the material supply pump according to preset control logic so as to ensure that the concentration of the liquid in the circulating tank is within a preset range.
Further, the vertical distance between the first pressure transmitter and the second pressure transmitter is not less than 500 mm.
Furthermore, the pressure taking ports of the first pressure transmitter and the second pressure transmitter are both positioned below the liquid level.
Furthermore, the first pressure transmitter, the second pressure transmitter and the temperature measuring device can be detachably connected to the circulating tank.
Furthermore, a liquid flowmeter, an electric ball valve and a reducer union are sequentially arranged at the outlet end of the material replenishing pump along the liquid flowing direction; and a first manual ball valve and a first filter are sequentially arranged between the circulating liquid outlet end of the circulating tank and the inlet end of the circulating pump along the liquid flowing direction, and the outlet end of the reducing joint is connected to a pipeline between the first manual ball valve and the first filter.
Further, still include material storage jar, material storage jar is connected in the import end of material replenishing pump, and is equipped with two manual ball valves and two filter along the liquid flow direction in proper order between material storage jar and the import end of material replenishing pump.
Furthermore, a liquid outlet of the circulating tank is connected with a receiving tank, and a manual ball valve III is arranged between the circulating tank and the receiving tank.
Further, the temperature measuring device is a temperature sensor.
Further, the controller is a PLC or a single chip microcomputer.
The utility model has the advantages that:
the utility model adopts two pressure transmitters to measure the density so as to indirectly measure the concentration, overcomes the measuring error caused by the change of the density of the silicon oil in the capillary, improves the measuring precision of the concentration of the liquid medium, can reach the same level of the tuning fork density meter and the nuclear density, can be used for the industrial-grade online measurement of the liquid concentration, controls the material supply quantity through the measured real-time concentration so as to ensure that the concentration is in the preset concentration range, and further ensures the high-efficiency operation of the electrolytic cell; the cost is saved; the structure of the container to be tested does not need to be changed, so that the installation, debugging and maintenance are convenient, and a special tool 475 is not needed for debugging and maintenance; compared with a double-flange transmitter, the fault rate is reduced; the fault judgment is simpler and more convenient, and the maintenance difficulty is reduced.
Drawings
FIG. 1 is a schematic view showing the connection relationship of a solution concentration control device for an oxygen cathode electrolytic cell integrated system according to an embodiment of the present invention.
Detailed Description
In order to facilitate better understanding of the present invention for those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments, which are given by way of illustration only and thus do not limit the scope of the present invention.
As shown in figure 1, the embodiment of the utility model discloses a solution concentration control device for oxygen cathode electrolytic cell integrated system includes electrolysis trough, circulation jar V103 at least, connects circulating pump P101 and material replenishing pump P103 between electrolysis trough and circulation jar, the circulating pump is arranged in realizing the circulation of liquid in the oxygen cathode electrolytic cell integrated system, in the reaction of this embodiment electrolysis trough, needs to continue to supply alkali lye to the electrolysis trough through material replenishing pump P103, the exit end of circulating pump P101 and the entry linkage of electrolysis trough, the export of electrolysis trough and the circulating liquid inlet connection of circulation jar V103, the exit end of material replenishing pump P103 is connected between circulation jar V103 and circulating pump P101.
As the most improved place of the utility model, the solution concentration control device of the oxygen cathode electrolytic cell complete system described in this embodiment further includes a controller AIC0101, two pressure transmitters for measuring the liquid pressure in the circulating tank and a temperature measuring device TI0101 for measuring the liquid temperature in the circulating tank; the two pressure transmitters are respectively a first pressure transmitter PIT0109 connected below the circulation tank V103 and a second pressure transmitter PIT0108 connected above the circulation tank V103, the two pressure transmitters and a temperature measuring device are both in contact with liquid in the circulation tank V103, the first pressure transmitter PIT0109 is used for measuring a high-pressure value below the inside of the circulation tank V103, the second pressure transmitter PIT0108 is used for measuring a low-pressure value above the inside of the circulation tank V103, the temperature measuring device TI0101 is used for measuring a temperature value of the liquid in the circulation tank V103, the controller AIC0101 is a PLC or a single chip microcomputer, and the controller is preferably integrated in a PLC of the oxygen cathode electrolytic cell complete system; the output end of the first pressure transmitter PIT0109, the output end of the second pressure transmitter PIT0108 and the output end of the temperature measuring device TI0101 are electrically connected with the input end of the controller AIC0101, the output end of the controller AIC0101 is connected with the control end of the material supply pump P103, the controller AIC0101 is used for calculating the real-time concentration of liquid in the circulation tank V103 based on a preset algorithm according to data collected by the first pressure transmitter PIT0109, the second pressure transmitter PIT0108 and the temperature measuring device TI0101, and controlling the material supply amount according to the rotating speed of the preset control logic control material supply pump P103 so as to ensure that the concentration of the liquid in the circulation tank V103 is within a preset range.
The working principle of the solution concentration control device of the oxygen cathode electrolytic cell complete system in the embodiment is as follows: after the liquid is subjected to electrochemical reaction in the electrolytic cell, the concentration of the liquid is changed and enters the circulation tank V103, the real-time pressures of the high pressure side and the low pressure side of the circulation tank V103 are respectively measured through the first pressure transmitter PIT0109 and the second pressure transmitter PIT0108, the real-time temperature of the liquid in the circulation tank V103 is measured through the temperature measuring device TI0101, the acquired high-pressure side pressure, low-pressure side pressure and temperature are transmitted to the controller, the controller AIC0101 subtracts the two pressures to calculate the differential pressure, then the density is calculated through the differential pressure, the real-time concentration is calculated according to the real-time density and the real-time temperature, and the high pressure side and the low pressure side adopt one pressure transmitter to measure the pressure, so that when the error of concentration measurement is increased, the fault position can be judged through the high-pressure transmitter and the low pressure; after the real-time concentration is calculated, the rotating speed of the material replenishing pump P103 is controlled according to the control logic preset in the controller AIC0101 to control the material replenishing amount, so that the concentration in the circulating tank V103 is ensured to be in a preset range, namely, when the concentration in the circulating tank V103 is higher than a preset highest concentration threshold value, the controller AIC0101 controls the rotating speed of the material replenishing pump P103 to be reduced, so that the material replenishing amount is reduced, and when the concentration in the circulating tank V103 is lower than a preset lowest concentration threshold value, the controller AIC0101 controls the rotating speed of the material replenishing pump P103 to be increased, so that the material replenishing amount is increased.
In the embodiment, preferably, the vertical distance between the first pressure transmitter PIT0109 and the second pressure transmitter PIT0108 is not less than 500mm, so as to ensure that a relatively large pressure difference can be obtained and improve the measurement accuracy; the first pressure transmitter PIT0109 and the second pressure transmitter PIT0108 both adopt pressure transmitters of the cross river brand, the sum of the two pressure transmitters is about 0.6 ten thousand, the price is lower than that of one double-flange transmitter adopted in the prior art, and the cost is greatly reduced; during measurement, the pressure taking ports of the first pressure transmitter and the second pressure transmitter PIT0108 are both located below the liquid level of the circulating tank V103.
Preferably, in this embodiment, the first pressure transmitter PIT0109, the second pressure transmitter PIT0108 and the temperature measuring device TI0101 are detachably connected to the circulation tank V103, and specifically, the first pressure transmitter PIT0109, the second pressure transmitter PIT0108 and the temperature measuring device TI0101 are all connected to the reserved screw interface of the circulation tank V103 through threads, and the pressure and the temperature in the tank can be measured in real time without making a structural change to the circulation tank V103. Further, in this embodiment, the temperature measuring device is a temperature sensor.
As a preferred embodiment, the oxygen cathode electrolytic cell complete system described in this embodiment, specifically, an alkaline hydrogen peroxide on-site production system, an alkaline solution concentration control device in the system includes a material storage tank V107, liquid caustic is stored in the material storage tank V107 in this embodiment, an outlet end of the material replenishment pump P103 is sequentially provided with a liquid flow meter FIAS0103, an electric ball valve XV1304A, and a reducer union 32 x 15 along a liquid flow direction, wherein an output end of the liquid flow meter FIAS0103 and an input end of the electric ball valve XV1304A are respectively electrically connected to a PLC of the alkaline hydrogen peroxide production system, the liquid flow meter FIAS0103 is used for feed-back flow detection and low-flow interlock, and the PLC in the alkaline hydrogen peroxide production system controls the on-off of the electric ball valve XV1304A according to a preset control logic; a manual ball valve I HV204 and a filter I FT003 are sequentially arranged between the circulating liquid outlet end of the circulating tank V103 and the inlet end of the circulating pump P101 along the liquid flowing direction, and the outlet end of the reducer union 32X 15 is connected between the manual ball valve I HV204 and the filter I FT 003; the material storage tank V107 is connected to the inlet end of the material supply pump P103, and a manual ball valve II HV202 and a filter II FT002 are sequentially arranged between the material storage tank V107 and the inlet end of the material supply pump P103 along the liquid flowing direction.
Furthermore, a receiving tank V108 is connected to a liquid outlet of the circulation tank V103, the receiving tank V108 is used for receiving liquid discharged from the circulation tank V103, and a manual ball valve III is arranged between the circulation tank V103 and the receiving tank V108.
The foregoing has described only the basic principles and preferred embodiments of the present invention and numerous changes and modifications may be made by those skilled in the art in light of the above teachings and shall fall within the scope of the present invention.
Claims (9)
1. A solution concentration control device for an oxygen cathode electrolytic cell complete system is characterized by at least comprising an electrolytic cell, a circulating tank, a circulating pump and a material replenishing pump, wherein the outlet end of the circulating pump is connected with the inlet of the electrolytic cell, the outlet of the electrolytic cell is connected with the circulating liquid inlet end of the circulating tank, the circulating liquid outlet end of the circulating tank is connected with the inlet end of the circulating pump, and the outlet end of the material replenishing pump is connected between the circulating tank and the circulating pump; also comprises a controller, two pressure transmitters for measuring the pressure of the liquid in the circulating tank and a temperature measuring device for measuring the temperature of the liquid in the circulating tank, wherein the two pressure transmitters are respectively a first pressure transmitter connected below the circulating tank and a second pressure transmitter connected above the circulating tank, the two pressure transmitters and the temperature measuring device are both contacted with the liquid in the circulating tank, the output end of the first pressure transmitter, the output end of the second pressure transmitter and the output end of the temperature measuring device are all electrically connected with the input end of the controller, the output end of the controller is connected with the control end of the material replenishing pump, the controller is used for calculating the real-time concentration of the liquid in the circulating tank according to the data collected by the first pressure transmitter, the second pressure transmitter and the temperature measuring device, and then controlling the material supply amount of the material supply pump according to preset control logic so as to ensure that the concentration of the liquid in the circulating tank is within a preset range.
2. The solution concentration control apparatus of an oxygen cathode electrolytic cell kit as claimed in claim 1, wherein the vertical distance between the first pressure transmitter and the second pressure transmitter is not less than 500 mm.
3. The solution concentration control device of oxygen cathode electrolytic cell complete set system according to claim 1, characterized in that the pressure taking ports of the first pressure transmitter and the second pressure transmitter are both located below the liquid level.
4. The solution concentration control device of oxygen cathode electrolytic cell complete set system according to claim 1, characterized in that the first pressure transmitter, the second pressure transmitter and the temperature measuring device are all detachably connected to the circulation tank.
5. The solution concentration control device of the oxygen cathode electrolytic cell complete system according to claim 1, wherein the outlet end of the material supply pump is provided with a liquid flow meter, an electric ball valve and a reducer union in sequence along the liquid flow direction; and a first manual ball valve and a first filter are sequentially arranged between the circulating liquid outlet end of the circulating tank and the inlet end of the circulating pump along the liquid flowing direction, and the outlet end of the reducing joint is connected to a pipeline between the first manual ball valve and the first filter.
6. The solution concentration control device of an oxygen cathode electrolytic cell complete set system as claimed in any one of claims 1 to 5, further comprising a material storage tank, wherein the material storage tank is connected to the inlet end of the material supply pump, and a manual ball valve II and a filter II are sequentially arranged between the material storage tank and the inlet end of the material supply pump along the liquid flow direction.
7. The apparatus for controlling the solution concentration in an oxygen cathode electrolysis cell integrated system according to claim 6, wherein a receiving tank is connected to the drain outlet of the circulation tank, and a third manual ball valve is provided between the circulation tank and the receiving tank.
8. The solution concentration control device of oxygen cathode electrolytic cell complete set system according to claim 1, characterized in that, the temperature measuring device is a temperature sensor.
9. The solution concentration control device of oxygen cathode electrolytic cell complete system according to claim 1, characterized in that the controller is PLC or single chip microcomputer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022037819.9U CN213172616U (en) | 2020-09-17 | 2020-09-17 | Solution concentration control device for oxygen cathode electrolytic cell complete system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022037819.9U CN213172616U (en) | 2020-09-17 | 2020-09-17 | Solution concentration control device for oxygen cathode electrolytic cell complete system |
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| CN213172616U true CN213172616U (en) | 2021-05-11 |
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| CN202022037819.9U Active CN213172616U (en) | 2020-09-17 | 2020-09-17 | Solution concentration control device for oxygen cathode electrolytic cell complete system |
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